CN111439820A - Boiler water pH value adjusting method and adjusting system - Google Patents
Boiler water pH value adjusting method and adjusting system Download PDFInfo
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- CN111439820A CN111439820A CN201910042620.4A CN201910042620A CN111439820A CN 111439820 A CN111439820 A CN 111439820A CN 201910042620 A CN201910042620 A CN 201910042620A CN 111439820 A CN111439820 A CN 111439820A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 222
- 238000000034 method Methods 0.000 title claims abstract description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 129
- 239000003814 drug Substances 0.000 claims abstract description 99
- 239000007788 liquid Substances 0.000 claims abstract description 99
- 239000001488 sodium phosphate Substances 0.000 claims abstract description 58
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims abstract description 58
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims abstract description 56
- 235000019801 trisodium phosphate Nutrition 0.000 claims abstract description 56
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 43
- 239000003513 alkali Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 24
- 229910019142 PO4 Inorganic materials 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 19
- 239000010452 phosphate Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 10
- 238000010979 pH adjustment Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 19
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- 235000011008 sodium phosphates Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910001412 inorganic anion Inorganic materials 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008155 medical solution Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- -1 suspended matters Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention is suitable for the technical field of chemical industry, and provides a method and a system for adjusting the pH value of boiler water, wherein the method comprises the following steps: adding trisodium phosphate and liquid alkali into the desalted water, and completely dissolving the trisodium phosphate to obtain a liquid medicine; continuously adding the liquid medicine into the boiler so that the pH value of boiler water in the boiler is 9-10.5; operating the boiler and measuring the pH value of the boiler water; judging whether the pH value of the pot water is not less than 9; if the pH value of the boiler water is less than 9, adding a certain amount of liquid caustic soda into the desalted water, and returning to the step of judging whether the pH value of the boiler water is not less than 9; if the pH value of the boiler water is not less than 9, maintaining the operation of the boiler, and returning to the step of measuring the pH value of the boiler water; the operation is simple and convenient, the adjusting process is quick, the boiler is effectively ensured to always run in a normal state, and the service life of the boiler is prolonged; can realize the automatic adjustment of the pH value of the boiler water, has high automatic operation degree and good application prospect.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a method and a system for adjusting the pH value of boiler water.
Background
During the operation of a steam boiler in a thermal power plant, the boiler is easily threatened by corrosion and scaling due to the particularity of the internal water vapor environment. Under normal operating conditions, the metal surface in the boiler is often covered with a layer of ferroferric oxide film (Fe)3O4) This is the formation of metal surfaces in high temperature boiler water. Fe3O4The membrane surface is compact, has good protective performance and can protect the boiler from being corroded. But Fe when the pH value of boiler water is less than 83O4The film is destroyed by dissolution, which leads to the loss of boiler surfaceDeprotected and subject to corrosion. Furthermore, when the pH value of the boiler water is low, Mg2+Is easy to be combined with PO4 3-The reaction generates magnesium phosphate which is easy to be adhered on the heated surface to form secondary scale. In addition, trisodium phosphate (Na) is added to the boiler when the pH of the boiler water is low3PO4) The scale inhibition effect of (A) cannot be normally exerted. Therefore, the pH value of the boiler water is adjusted, and the method plays a vital role in preventing corrosion and scaling of the boiler.
Although the currently adopted scheme for adjusting the pH value of boiler water can ensure that the boiler stably and continuously operates within a period of time, the pH value of the boiler water can still be linearly reduced to below 8 under the conditions that liquid ammonia is added into the feed water and the dosage of trisodium phosphate is not changed in the boiler water after the boiler water operates for a period of time. The water quality conditions of all sections of the whole water treatment system are checked to find that the rest parts are normal except the pH value of the boiler water, so that the conclusion that acidic substances are generated in the boiler water most possibly, the alkalinity is consumed by the acidic substances, and the pH value of the boiler water is greatly reduced is concluded.
One currently available solution is to increase the amount of trisodium phosphate added to make Phosphate (PO) in the pot water4 3-) The content is increased, although the method can increase the pH value of the pot water by a small degree, the pH value is increased slowly and cannot meet the adjustment requirement.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method for adjusting the pH value of boiler water, so as to solve the technical problem that the adjustment of the pH value of boiler water in the prior art cannot meet the requirement.
The first aspect of the embodiment of the invention provides a method for adjusting the pH value of boiler water, which comprises the following steps:
adding trisodium phosphate and liquid alkali into the desalted water, and completely dissolving the trisodium phosphate to obtain a liquid medicine;
continuously adding the liquid medicine into a boiler so that the pH value of boiler water in the boiler is 9-10.5;
operating the boiler and measuring the pH value of the boiler water;
judging whether the pH value of the pot water is not less than 9;
if the pH value of the pot water is less than 9, adding a certain amount of liquid caustic soda into the desalted water, and returning to the step of judging whether the pH value of the pot water is not less than 9;
and if the pH value of the boiler water is not less than 9, maintaining the operation of the boiler system, and returning to the measurement of the pH value of the boiler water.
A second aspect of an embodiment of the present invention provides a system for adjusting a pH value of boiler water, including:
the medicine tank is used for containing medicine liquid;
the medicine feeding pump is connected with the medicine tank and used for injecting the liquid medicine into the boiler;
the demineralized water adding device is used for injecting demineralized water into the medicine tank;
a trisodium phosphate adding device for adding trisodium phosphate to the medicine tank;
the liquid caustic soda adding device is used for injecting liquid caustic soda into the medicine tank;
and the detection device is at least used for detecting the pH value of the boiler water in the boiler.
A third aspect of an embodiment of the present invention provides a boiler water pH adjusting device, comprising a memory, a processor and a computer program stored in the memory and operable on the processor, wherein the processor implements the steps of the above method when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above-described method.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
through detecting the pH value of boiler water in the boiler operation process, and adopt liquid caustic soda to adjust the pH value of boiler water according to the testing result, easy operation is convenient, and the adjustment process is quick, can be adjusted back to normal condition rapidly when the pH value of boiler water deviates from normal operating range, has effectively ensured that the boiler operates under normal condition all the time, has prolonged the life of boiler. Meanwhile, the automatic adjustment of the pH value of the boiler water can be realized through the control device, the automatic operation degree is high, the workload of operators is greatly reduced, and the automatic adjustment device has a good application prospect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a first schematic structural diagram of a boiler water pH value adjustment system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram II of a boiler water pH value adjusting system provided by the embodiment of the invention;
FIG. 3 is a schematic flow chart of a method for adjusting the pH value of boiler water according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an interaction flow of step S11 in the method for adjusting the pH of boiler water according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a boiler water pH adjusting device provided in an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic structural diagram of a first boiler water pH adjustment system according to an embodiment of the present invention. The boiler water pH value adjusting system 10 comprises a medicine tank 11, a medicine adding pump 12, a demineralized water adding device 13, a trisodium phosphate adding device 14, a liquid caustic soda adding device 15 and a detecting device 16. The medicine tank 11 is used for containing liquid medicine, and the medicine adding pump 12 is connected with the medicine tank 11 and used for injecting the liquid medicine into the boiler 20; the demineralized water adding device 13 is used for injecting demineralized water into the medicine tank 11, the trisodium phosphate adding device 14 is used for adding trisodium phosphate into the medicine tank, the liquid caustic soda adding device 15 is used for injecting liquid caustic soda into the medicine tank 11, and the detecting device 16 is at least used for detecting the pH value of pot water in the boiler 20.
The medicinal liquid is prepared by adding trisodium phosphate (Na) into desalted water3PO4) And liquid caustic soda, and is mixed and stirred sufficiently, which is used for adjusting the pH value of the boiler water in the boiler 20 to ensure that the pH value of the boiler water can be maintained in a range required by normal operation. The desalted water is finished water obtained by removing impurities in water such as suspended matters, colloid, inorganic cations, anions and the like by various water treatment processes. The less impurities in the desalted water, the higher the water purity. The trisodium phosphate is strongly basic and can effectively prevent the formation of scale in the boiler 20. The liquid caustic soda can be 45% sodium hydroxide solution, and is strong in alkalinity and beneficial to adjusting the pH value of the pot water.
Further, in order to completely dissolve the trisodium phosphate added into the medicine tank 11 and uniformly stir the liquid caustic soda and the trisodium phosphate, etc., a stirring pump 17 may be further provided in the medicine tank 11, which may be turned on and off as needed to ensure complete dissolution of the trisodium phosphate, and simultaneously, the components in the liquid medicine may be more uniform through sufficient stirring.
Further, in order to ensure that the boiler 20 can normally operate, it is necessary to ensure that other indexes of the boiler water in the boiler 20 are also within a preset range, so the detection device 16 is also used for detecting the phosphate content, the silicon oxide content and the electrical conductivity in the boiler water. In one embodiment, the detection device 16 includes a pH measurement module, a phosphate measurement module, a silicon oxide measurement module, and an electrical conductivity measurement module, which are respectively used for measuring the pH, phosphate content, silicon oxide content, and electrical conductivity of the boiler water. The pH measuring module, the phosphate radical measuring module, the silicon oxide measuring module and the conductivity measuring module may be independent modules, or may be integrated into a whole, which is not limited herein. Of course, the detection device may also comprise other measuring modules, and thus may be used for measuring other indicators in the boiler water.
When the boiler water pH value adjusting system 10 works, firstly, demineralized water is added into the medicine tank 11 by the demineralized water adding device 13, then trisodium phosphate and liquid alkali are respectively added into the medicine tank 11 by the trisodium phosphate adding device 14 and the liquid alkali adding device 15, the stirring pump 17 in the medicine tank 11 is started to enable the trisodium phosphate to be completely dissolved in the demineralized water, and the stirring pump 17 is closed after the trisodium phosphate is uniformly stirred, so that liquid medicine is obtained.
After the liquid medicine is prepared, when the pH value of the boiler water in the boiler 20 needs to be adjusted, the medicine adding pump 12 is started, so that the liquid medicine is continuously added into the boiler 20, and the amount of the liquid medicine added into the boiler water is adjusted by adjusting the flow rate of the medicine adding pump 12. At the moment, the detection device 16 detects various indexes of the pot water to ensure that the content of phosphate radicals, the content of silicon oxide and the conductivity are within a preset range, and simultaneously detects the pH value of the pot water to ensure that the pH value is between 9 and 10.5. When all indexes of the boiler water meet the requirements, the boiler 20 is started, and therefore the boiler 20 starts to operate. In the operation process, the detection device 16 can detect the boiler water regularly, and when the pH value of the boiler water is detected to be lower than 9, the liquid caustic soda adding device 15 adds liquid caustic soda into the boiler, so that the pH value of the boiler water is also adjusted, and the boiler 20 can be ensured to operate in a normal state all the time.
Fig. 2 is a schematic structural diagram of a second boiler water pH adjusting system according to an embodiment of the present invention. In the boiler water pH value adjusting system, the adjustment of the boiler water pH value can be controlled by a control device, thereby realizing automation.
The boiler water pH value adjusting system 10 comprises a chemical tank 11, a chemical feeding pump 12, a demineralized water adding device 13, a trisodium phosphate adding device 14, a liquid caustic soda adding device 15, a detecting device 16 and a control device 18. The medicine tank 11 is used for containing liquid medicine, and the medicine adding pump 12 is connected with the medicine tank 11 and used for injecting the liquid medicine into the boiler 20; the demineralized water adding device 13 is used for injecting demineralized water into the medicine tank 11, the trisodium phosphate adding device 14 is used for adding trisodium phosphate into the medicine tank, the liquid caustic soda adding device 15 is used for injecting liquid caustic soda into the medicine tank 11, and the detecting device 16 is at least used for detecting the pH value of pot water in the boiler 20.
The control device 18 is connected with the dosing pump 12 and is used for controlling the working state of the dosing pump 12, so that the opening, the closing, the flow rate and the like of the dosing pump can be controlled; the control device 18 is connected with the demineralized water adding device 313 and is used for controlling the working state of the demineralized water adding device 13, so that when the demineralized water is injected into the medicine tank 11 and the amount of the demineralized water injected can be controlled; the control device 18 is connected with the trisodium phosphate adding device 14 and is used for controlling the working state of the trisodium phosphate adding device 14, so that when the trisodium phosphate is injected into the medicine tank 11 and the amount of the trisodium phosphate can be controlled; the control device 18 is connected with the liquid caustic soda adding device 15 and is used for controlling the working state of the liquid caustic soda adding device 15, so that when the liquid caustic soda is injected into the medicine tank 11 and the amount of the injected liquid caustic soda can be controlled; the control device 18 is connected with the detection device 16 and is used for controlling the working state of the detection device 16, so that the detection device 16 can be controlled to detect various indexes (including pH value) of the pot water, and whether the liquid caustic soda adding device 15 adds liquid caustic soda into the medicine tank 11 is controlled according to the detection result.
The medicinal liquid is prepared by adding trisodium phosphate (Na) into desalted water3PO4) And liquid caustic soda, and is mixed and stirred sufficiently, which is used for adjusting the pH value of the boiler water in the boiler 20 to ensure that the pH value of the boiler water can be maintained in a range required by normal operation. The trisodium phosphate is strongly basic and can effectively prevent the formation of scale in the boiler 20. The liquid caustic soda can be 45% sodium hydroxide solution, and is strong in alkalinity and beneficial to adjusting the pH value of the pot water.
Further, in order to completely dissolve the trisodium phosphate added into the medicine tank 11 and uniformly stir the liquid caustic soda and the trisodium phosphate, etc., a stirring pump 17 may be further provided in the medicine tank 11, which may be turned on and off as needed to ensure complete dissolution of the trisodium phosphate, and simultaneously, the components in the liquid medicine may be more uniform through sufficient stirring. The control device 18 is connected with the stirring pump 17, so that the working state of the stirring pump 17 can be controlled, the stirring can be uniform, and the electric energy can be saved.
Further, in order to ensure that the boiler 20 can normally operate, it is necessary to ensure that other indexes of the boiler water in the boiler 20 are also within a preset range, so the detection device 16 is also used for detecting the phosphate content, the silicon oxide content and the electrical conductivity in the boiler water. In one embodiment, the detecting device 16 includes a pH measuring module, a phosphate measuring module, a silicon oxide measuring module, and an electrical conductivity measuring module, which are connected to the control device 18 for measuring the pH, phosphate content, silicon oxide content, and electrical conductivity of the boiler water. The pH measuring module, the phosphate radical measuring module, the silicon oxide measuring module and the conductivity measuring module may be independent modules, or may be integrated into a whole, which is not limited herein. Of course, the detection device may also comprise other measuring modules, and thus may be used for measuring other indicators in the boiler water.
When the boiler water pH value adjusting system 10 works, firstly the control device 18 controls the demineralized water adding device 13 to add demineralized water into the medicine tank 11, then the control device 18 controls the trisodium phosphate adding device 14 and the liquid alkali adding device 15 to respectively add trisodium phosphate and liquid alkali into the medicine tank 11, and controls to start the stirring pump 17 in the medicine tank 11 so as to enable the trisodium phosphate to be completely dissolved in the demineralized water, and the stirring pump 17 is closed after the trisodium phosphate is uniformly stirred, so that liquid medicine is obtained.
After the chemical solution is prepared, when the pH value of the boiler water in the boiler 20 needs to be adjusted, the control device 18 controls the chemical adding pump 12 to be started, so that the chemical solution is continuously added into the boiler 20, and the amount of the chemical solution added into the boiler water is adjusted by adjusting the flow rate of the chemical adding pump 12. At the moment, the control device 18 controls the detection device 16 to detect various indexes of the pot water so as to ensure that the content of phosphate radicals, the content of silicon oxide and the conductivity are within preset ranges, and simultaneously, the pH value of the pot water is detected so as to ensure that the pH value is between 9 and 10.5. When all indexes of the boiler water meet the requirements, the boiler 20 is started, and therefore the boiler 20 starts to operate. In the operation process, the detection device 16 can detect the boiler water periodically, and when the pH value of the boiler water is detected to be lower than 9, the control device 18 controls the liquid caustic soda adding device 15 to add the liquid caustic soda into the boiler, so that the pH value of the boiler water is also adjusted, and the boiler 20 can be ensured to operate in a normal state all the time.
Fig. 3 is a flowchart illustrating an implementation of the method for adjusting the pH value of boiler water according to the embodiment of the present invention, where the method may be implemented by the first system for adjusting the pH value of boiler water, may also be implemented by the second system for adjusting the pH value of boiler water, and may also be implemented by other software and/or hardware. The method for adjusting the pH value of boiler water comprises the following steps:
step S11: trisodium phosphate and liquid alkali are added to the demineralized water, and the trisodium phosphate is completely dissolved to obtain a liquid medicine.
The trisodium phosphate helps to prevent the formation of scale in the boiler, and the liquid alkali has stronger alkalinity, so that the pH value of the boiler water in the boiler can be effectively adjusted. After the trisodium phosphate is added into the desalted water, the desalted water needs to be stirred to ensure that the trisodium phosphate can be completely dissolved, so that the dissolving speed of the desalted water can be increased.
Referring to fig. 4, in one embodiment, a process for preparing a medical solution comprises:
step S111: adding desalted water into the medicine tank.
Before adding the demineralized water, whether the storage amount of the liquid medicine in the medicine tank is lower than a preset value needs to be judged, and when the storage amount of the liquid medicine in the medicine tank is lower than the preset value, the liquid medicine is insufficient, and the liquid medicine needs to be supplemented in time. When the demineralized water is added, the subsequent liquid alkali is considered, so that the demineralized water is not required to be added too fully, for example, the demineralized water can be added to about 90% of the volume of the medicine tank, so that the space of the medicine tank can be fully utilized, the medicine tank can contain as much liquid medicine as possible, and enough space is reserved for the subsequent addition of other components.
Step S112: adding trisodium phosphate and liquid alkali into a medicine tank.
For example, considering the volume of the medicine tank as 2000L, 30kg of sodium phosphate and 12L% of liquid alkali, which is 45% sodium hydroxide solution by mass, can be added.
Step S113: the stirring pump is started to stir the demineralized water until the trisodium phosphate is completely dissolved.
Step S114: and turning off the stirring pump to obtain the liquid medicine.
The stirring pump can effectively improve the dissolving speed of the trisodium phosphate and can uniformly stir the trisodium phosphate and the liquid caustic soda. After the liquid medicine is prepared, the pot water in the boiler needs to be adjusted through the liquid medicine.
Step S12: and continuously adding the liquid medicine into the boiler so that the pH value of the boiler water in the boiler is 9-10.5.
During the process of continuously adding the liquid medicine, the adding speed of the liquid medicine can be controlled by adjusting the flow. In the process of adding the liquid medicine, the pH value of the boiler water in the boiler is detected, so that the pH value of the boiler water can be known in time, and the pH value of the boiler water is controlled within a preset range. Too large or too small pH value of the boiler water is not beneficial to the operation of the boiler, and the damage to boiler equipment is easily caused. When the pH value of the pot water meets the requirement, the addition of the liquid medicine is stopped.
In order to ensure that the boiler can normally operate, other indexes of the boiler water in the boiler are required to be ensured to be within a preset range, for example, the content of phosphate in the boiler water is 2 mg/L-10 mg/L, the content of silicon oxide is not more than 2 mg/L, and the conductivity of the boiler water is not more than 150 μ s/cm., which can be detected by a detection device, and the detection device can comprise a pH value measurement module, a phosphate value measurement module, a silicon oxide measurement module and a conductivity measurement module, which are respectively used for measuring the pH value, the phosphate value content, the silicon oxide content and the conductivity of the boiler.
When the pH value and other indexes of the boiler water in the boiler are all within the preset range, the boiler water meets the requirements, and the next step is continued.
Step S13: the boiler was operated and the pH of the boiler water was measured.
In the operation process of the boiler, the system matched with the boiler can synchronously operate. The measurement of the pH value of the boiler water can be a timing measurement, for example, sampling once every hour, or an irregular measurement, and can be set according to requirements.
Step S14: and judging whether the pH value of the pot water is not less than 9. Whether the pH value of the pot water is not less than 9 can be known in a manual reading mode, and the pH value can also be known in other modes.
If the pH value of the pot water is less than 9, the pH value of the pot water is low, and the pH value of the pot water needs to be adjusted, and at the moment, the following steps need to be carried out:
step S15: an amount of liquid caustic is added to the desalted water and returned to step S14.
The addition of the caustic soda liquid into the medicine tank means that the pH value of the medicine liquid is increased, so that the medicine liquid injected into the pot water is more alkaline, and the pH value of the pot water is more convenient to adjust.
If the pH value of the boiler water is not less than 9, the pH value of the boiler water is in a normal range, the boiler normally operates, and at the moment:
step S16: the operation of the boiler system is maintained and the process returns to step S13 for periodic or irregular sampling analysis.
By continuously repeating the above process, it can be ensured that the boiler operates in a normal state.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention. The process of preparing the liquid medicine and the process of adjusting the pH value can be completed by an operator manually operating the first boiler water pH value adjusting system, or can be automatically completed by a second boiler water pH value adjusting system, which is not limited herein.
The method for adjusting the pH value of boiler water provided by the embodiment has the beneficial effects that:
through detecting the pH value of boiler water in the boiler operation process, and adopt liquid caustic soda to adjust the pH value of boiler water according to the testing result, easy operation is convenient, and the adjustment process is quick, can be adjusted back to normal condition rapidly when the pH value of boiler water deviates from normal operating range, has effectively ensured that the boiler operates under normal condition all the time, has prolonged the life of boiler. Meanwhile, the automatic adjustment of the pH value of the boiler water can be realized through the control device, the automatic operation degree is high, the workload of operators is greatly reduced, and the automatic adjustment device has a good application prospect.
Fig. 5 is a schematic diagram of a boiler water pH adjusting device according to an embodiment of the present invention. As shown in fig. 5, the boiler pot water pH adjusting device 6 of this embodiment includes: a processor 60, a memory 61, and a computer program 62, such as a boiler water pH adjustment program, stored in the memory 61 and operable on the processor 60. The processor 60, when executing the computer program 62, implements the steps in the various boiler water pH adjustment method embodiments described above, such as the steps S11-S16 shown in fig. 3. Alternatively, the processor 60 implements the functions of the modules/units in the above-described device embodiments when executing the computer program 62.
Illustratively, the computer program 62 may be partitioned into one or more modules/units that are stored in the memory 61 and executed by the processor 60 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 62 in the boiler water pH adjustment 6. For example, the computer program 62 may be at least divided into:
the first module is used for controlling the demineralized water adding device to inject the demineralized water into the medicine tank.
And the second module is used for controlling the trisodium phosphate adding device to add trisodium phosphate into the medicine tank.
And the third module is used for controlling the liquid caustic soda adding device to inject liquid caustic soda into the medicine tank.
And the fourth module is used for controlling the dosing pump so that the medicine tank can inject medicine liquid into the boiler.
The fifth module is used for controlling the working state of the stirring pump so as to ensure that the sodium phosphate is completely dissolved and the liquid medicine is stirred more uniformly;
and the sixth module is used for controlling the detection device, so that the monitoring device can periodically or irregularly acquire various indexes in the boiler water, including but not limited to the pH value, the phosphate radical content, the silicon oxide content and the conductivity of the boiler water.
And the seventh module is used for judging whether the pH value of the obtained pot water is not less than 9. If the pH value of the obtained boiler water is not less than 9, the boiler is normal in operation, and at the moment, the boiler is only required to be maintained to be normal in operation; if the pH value of the boiler water is more than 9, the boiler is abnormal in operation, and at the moment, the third module controls the liquid caustic soda adding device to inject liquid caustic soda into the chemical tank, so that the pH value of the boiler water is increased.
The boiler water pH value adjusting device 6 can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The boiler water pH adjusting device 6 may include, but is not limited to, a processor 60, and a memory 61. It will be understood by those skilled in the art that fig. 5 is merely an example of the boiler water pH adjusting means 6 and does not constitute a limitation of the boiler water pH adjusting means 6 and may include more or less components than shown, or combine certain components, or different components, e.g., the boiler water pH adjusting may also include input output devices, network access devices, buses, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the boiler water pH adjusting device 6, such as a hard disk or a memory of the boiler water pH adjusting device 6. The memory 61 may also be an external storage device of the boiler water pH adjusting apparatus 6, such as a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the boiler water pH adjusting apparatus 6. Further, the memory 61 may also comprise both an internal storage unit and an external storage device of the boiler water pH adjusting means 6. The memory 61 is used for storing the computer program and other programs and data required by the boiler water pH adjusting means 6. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for adjusting the pH value of boiler water is characterized by comprising the following steps:
adding trisodium phosphate and liquid alkali into the desalted water, and completely dissolving the trisodium phosphate to obtain a liquid medicine;
continuously adding the liquid medicine into a boiler so that the pH value of boiler water in the boiler is 9-10.5;
operating the boiler and measuring the pH value of the boiler water;
judging whether the pH value of the pot water is not less than 9;
if the pH value of the pot water is less than 9, adding a certain amount of liquid caustic soda into the desalted water, and returning to the step of judging whether the pH value of the pot water is not less than 9;
and if the pH value of the boiler water is not less than 9, maintaining the operation of the boiler, and returning to the measurement of the pH value of the boiler water.
2. The method for adjusting the pH value of boiler pot water according to claim 1, wherein the step of adding trisodium phosphate and liquid alkali into the demineralized water and completely dissolving the trisodium phosphate to obtain the liquid medicine comprises:
adding desalted water into the medicine tank;
adding trisodium phosphate and liquid alkali into the medicine tank;
starting a stirring pump to stir the desalted water until the trisodium phosphate is completely dissolved;
and closing the stirring pump to obtain the liquid medicine.
3. The method for adjusting the pH value of boiler water according to claim 1, wherein the content of phosphate in the boiler water is 2 mg/L-10 mg/L, the content of silicon oxide is not more than 2 mg/L, and the electrical conductivity of the boiler water is not more than 150 μ s/cm.
4. The method for adjusting the pH value of boiler water according to claim 1, wherein in the step of adding a certain amount of liquid caustic soda into the desalted water if the pH value of the boiler water is less than 9, the amount of the liquid caustic soda is 1000m L-2000 m L.
5. The method for adjusting the pH value of boiler water according to any one of claims 1 to 4, wherein the liquid alkali is a 45% sodium hydroxide solution by mass.
6. A boiler pot water pH value adjustment system, characterized by includes:
the medicine tank is used for containing medicine liquid;
the medicine feeding pump is connected with the medicine tank and used for injecting the liquid medicine into the boiler;
the demineralized water adding device is used for injecting demineralized water into the medicine tank;
a trisodium phosphate adding device for adding trisodium phosphate to the medicine tank;
the liquid caustic soda adding device is used for injecting liquid caustic soda into the medicine tank;
and the detection device is at least used for detecting the pH value of the boiler water in the boiler.
7. The boiler pot water pH adjustment system of claim 6, wherein a stirring pump is provided in the chemical tank for stirring the chemical solution.
8. The boiler water pH adjustment system of claim 6, wherein the detection device is further configured to detect a phosphate content, a silica content, and an electrical conductivity in the boiler water.
9. A boiler pot water pH adjustment arrangement comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor, when executing said computer program, realizes the steps of the method according to any of the claims 1 to 5.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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