CN104277006A - Method for switching hot gas coolers on line in melamine production - Google Patents
Method for switching hot gas coolers on line in melamine production Download PDFInfo
- Publication number
- CN104277006A CN104277006A CN201410593505.3A CN201410593505A CN104277006A CN 104277006 A CN104277006 A CN 104277006A CN 201410593505 A CN201410593505 A CN 201410593505A CN 104277006 A CN104277006 A CN 104277006A
- Authority
- CN
- China
- Prior art keywords
- hot gas
- gate valve
- electric gate
- hot
- air filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920000877 Melamine resin Polymers 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 12
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000004640 Melamine resin Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000009615 deamination Effects 0.000 description 3
- 238000006481 deamination reaction Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000002742 anti-folding effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XLJMAIOERFSOGZ-UHFFFAOYSA-N anhydrous cyanic acid Natural products OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- -1 formaldehyde, butanols Chemical class 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/56—Preparation of melamine
- C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/62—Purification of melamine
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The invention relates to a method for switching hot gas coolers on line in melamine production. The method comprises the following steps: connecting the outlet of a fluidized bed with a set of hot gas coolers, primary cyclone separators and hot gas filters which are connected in sequence, sequentially feeding a generated gas of the fluidized bed into the hot gas coolers for cooling, passing through the primary cyclone separators, furthering feeding into the hot gas filters for filtration, and finally crystallizing in a crystallizer. The method is characterized in that the outlet of the fluidized bed is connected with a set of the hot gas coolers, the primary cyclone separators and hot gas filters which are connected in sequence in parallel, and by controlling a first electronic gate valve, a second electronic gate valve, a third electronic gate valve and a fourth electronic gate valve, any one hot gas cooler and any one hot gas filter can be switched to be used in a mutual standby application manner. Due to mutual switching use of the hot gas coolers, the switching times of the hot gas filters are reduced by 50%, the overhaul frequency is effectively reduced, the production cost is further reduced, and remarkable economic benefits are made.
Description
Technical field
The invention belongs to chemical production technical field, relate to a kind of method that hot gas water cooler in Melamine Production switches online, reached by the switching of hot gas water cooler and make each hot-air filter form a closed circuit pipeline, mutually switch use, for subsequent use each other.
Background technology
Trimeric cyanamide is a kind of important chemical industry intermediates, is polymerized and can obtains melamine resin, can be used for plastics and coatings industry with formaldehyde condensation, also can do the anti-folding of yarn fabric, anti-shrinking agent.Its modified resin can do lovely luster, the metallic paint that durable, hardness is good.It also can be used for firm, heat-resisting fancy veneer, and building paper and grey leather are tanned the caking agent of skin agent, synthesizing fireproof laminate, the fixing agent of water-resisting agent or stiffening agent etc.Be obtained 582 melamine resins of raw material by trimeric cyanamide, formaldehyde, butanols.As the flow agent of solvent borne polyurethane coating, effect spy is good.Also tanning agent and the weighting agent of leather processing is made for synthesis that is organic and resin.Be polymerized with formaldehyde condensation and can obtain melamine resin, can be used for plastics and coatings industry, also can do the anti-folding of yarn fabric, anti-shrinking agent.Its modified resin can do lovely luster, the metallic paint that durable, hardness is good.Trimeric cyanamide be polymerized with formaldehyde condensation the melamine resin made be widely used in Wood construction formwork manufacture and in processing.Can be used for the waterproof of template surface and the adhesion of block board, what increase template reuses number of times.
In Melamine Production in the past, because the life cycle of hot gas water cooler is shorter in system, only have about 1 month, and the life cycle of hot-air filter is longer, can more than 2 months be reached.After hot gas water cooler reaches life cycle, need stop switch time, hot-air filter also reaches life cycle far away, so just cause hot-air filter filter bag use waste.
Summary of the invention:
Object of the present invention is just to provide a kind of method that in Melamine Production, hot gas water cooler switches online, after hot gas cooler outlet being carried out to relevant transformation, when hot gas water cooler switches after reaching life cycle, hot-air filter can switch together, still can continue to use, till reaching life cycle.
Technical scheme of the present invention is as follows:
The online switching method of hot gas water cooler in a kind of Melamine Production, fluidized-bed outlet connects a set of hot gas water cooler, primary cyclone, hot-air filter connected successively, the generation gas of fluidized-bed enters hot gas water cooler successively and cools, then after primary cyclone, after entering hot-air filter filtration again, finally to decrystallize device crystallization, it is characterized in that:
A, fluidized-bed outlet a set of hot gas water cooler, primary cyclone, hot-air filter connected successively in parallel again;
B, every platform hot gas cooler inlet connect first electric gate valve respectively, and two first electric gate valve imports are connected to fluidized-bed outlet jointly;
C, every platform hot gas cooler outlet connect a primary cyclone respectively, every platform primary cyclone outlet pipe connects second electric gate valve respectively, uses pipeline UNICOM between two second electric gate valves;
D, every platform hot-air filter inlet pipe connect the 3rd electric gate valve respectively, pipeline UNICOM is used between two the 3rd electric gate valves, every platform hot-air filter outlet pipe connects respectively the 4th electric gate valve, use pipeline UNICOM between two the 4th electric gate valves, and this connecting pipe is connected to crystallizer;
Unicom pipeline between e, the second electric gate valve and the unicom pipeline between the 3rd electric gate valve also use pipeline UNICOM;
F, by control first electric gate valve to the 4th electric gate valve, make arbitrary hot gas water cooler mutually can switch use with arbitrary hot-air filter, for subsequent use each other.
The present invention is after carrying out relevant transformation to hot gas cooler outlet, when hot gas water cooler switches after reaching life cycle, hot-air filter can switch together, hot-air filter switching times decreases 50%, to effectively reduce the maintenance frequency, save production cost further, economic benefit is obvious.
Accompanying drawing illustrates:
Fig. 1 is process flow diagram provided by the invention.
Specific implementation method:
One, the online switching method of hot gas water cooler in a kind of Melamine Production provided by the invention, as shown in Figure 1, comprise fluidized-bed outlet and connect a set of hot gas water cooler, primary cyclone, hot-air filter connected successively, the generation gas of fluidized-bed enters hot gas water cooler successively and cools, then after primary cyclone, after entering hot-air filter filtration again, device crystallization of finally decrystallizing, is characterized in that:
A, fluidized-bed outlet a set of hot gas water cooler, primary cyclone, hot-air filter connected successively in parallel again;
B, every platform hot gas cooler inlet connect first electric gate valve respectively, and two first electric gate valve imports are connected to fluidized-bed outlet jointly;
C, every platform hot gas cooler outlet connect a primary cyclone respectively, every platform primary cyclone outlet pipe connects second electric gate valve respectively, uses pipeline UNICOM between two second electric gate valves;
D, every platform hot-air filter inlet pipe connect the 3rd electric gate valve respectively, pipeline UNICOM is used between two the 3rd electric gate valves, every platform hot-air filter outlet pipe connects respectively the 4th electric gate valve, use pipeline UNICOM between two the 4th electric gate valves, and this connecting pipe is connected to crystallizer;
Unicom pipeline between e, the second electric gate valve and the unicom pipeline between the 3rd electric gate valve also use pipeline UNICOM;
F, by control first electric gate valve to the 4th electric gate valve, make arbitrary hot gas water cooler mutually can switch use with arbitrary hot-air filter, for subsequent use each other.
Two, in the present invention, in a fluidized bed reactor, trimeric cyanamide is produced in pyrolysis under 400 DEG C of high temperature gas flows and catalyst action, polymerization to urea.
A, generate gas main containing gas and catalyst particles etc. such as NH3 and CO2, trimeric cyanamide, isocyanic acid, trimeric cyanamide deamination things from the reaction out of fluidized-bed top;
B, because the deamination thing of trimeric cyanamide can affect melamine formaldehyde resin quality, must to remove.For this reason, hot gas water cooler need be introduced into from the generation gas of fluidized-bed to cool.Hot gas water cooler is the fixed tube sheet heat exchanger of a shell side band evaporating space.Tube side is walked reaction and is generated gas, and shell side is the raw liquid heat exchange in saturated road that oil generation tube side swiftly flowing reaction in saturated road generates outside gas and pipe.Reaction generates gas and is cooled to 320 ~ 330 DEG C, and the deamination substance crystallization of trimeric cyanamide is wherein separated out, and enters initial separator together with air-flow.Initial separator is first got off the separating substances of larger particles, and remaining enters hot-air filter with air-flow.Strainer tube in strainer is divided into 12 groups;
C, by the outlet of two primary cyclone, namely on hot-air filter inlet pipe by diameter 630mm fastener for connection.600mm electric gate valve is loaded onto respectively on two primary cyclone outlet pipes.Outlet threeway diameter 630mm steel pipe divides on two hot-air filter inlet pipes, installs two 600mm electric gate valves.Each hot-air filter forms a closed circuit pipeline like this, mutually switches use, for subsequent use each other;
D, due to the hot gas water cooler cycle of operation short, after one month, change, now carry out the switching of hot gas water cooler, by switching the electric gate valve on two hot gas cooler inlet pipes and on primary cyclone outlet pipe, switch the electric gate valve of hot-air filter import again, carry out a set of hot gas filtration system of cut-in stand-by, reach the online object switched.
E, after hot gas cooler outlet being carried out to relevant transformation, when hot gas water cooler switches after reaching life cycle, hot-air filter can switch together, hot-air filter switching times decreases 50%, to effectively reduce the maintenance frequency, save production cost further, economic benefit is obvious.
Claims (1)
1. the online switching method of hot gas water cooler in a Melamine Production, fluidized-bed outlet connects a set of hot gas water cooler, primary cyclone, hot-air filter connected successively, the generation gas of fluidized-bed enters hot gas water cooler successively and cools, then after primary cyclone, after entering hot-air filter filtration again, finally to decrystallize device crystallization, it is characterized in that:
A, fluidized-bed outlet a set of hot gas water cooler, primary cyclone, hot-air filter connected successively in parallel again;
B, every platform hot gas cooler inlet connect first electric gate valve respectively, and two first electric gate valve imports are connected to fluidized-bed outlet jointly;
C, every platform hot gas cooler outlet connect a primary cyclone respectively, every platform primary cyclone outlet pipe connects second electric gate valve respectively, uses pipeline UNICOM between two second electric gate valves;
D, every platform hot-air filter inlet pipe connect the 3rd electric gate valve respectively, pipeline UNICOM is used between two the 3rd electric gate valves, every platform hot-air filter outlet pipe connects respectively the 4th electric gate valve, use pipeline UNICOM between two the 4th electric gate valves, and this connecting pipe is connected to crystallizer;
Unicom pipeline between e, the second electric gate valve and the unicom pipeline between the 3rd electric gate valve also use pipeline UNICOM;
F, by control first electric gate valve to the 4th electric gate valve, make arbitrary hot gas water cooler mutually can switch use with arbitrary hot-air filter, for subsequent use each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410593505.3A CN104277006A (en) | 2014-10-30 | 2014-10-30 | Method for switching hot gas coolers on line in melamine production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410593505.3A CN104277006A (en) | 2014-10-30 | 2014-10-30 | Method for switching hot gas coolers on line in melamine production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104277006A true CN104277006A (en) | 2015-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410593505.3A Pending CN104277006A (en) | 2014-10-30 | 2014-10-30 | Method for switching hot gas coolers on line in melamine production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104277006A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381627A (en) * | 2015-12-14 | 2016-03-09 | 尹明大 | Melamine fluidized bed crystallizer |
| CN106083752A (en) * | 2016-06-12 | 2016-11-09 | 山东省舜天化工集团有限公司 | A kind of steam cooler cleaning plant based on Melamine Production |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328401A (en) * | 1964-02-11 | 1967-06-27 | Chemical Construction Corp | Synthesis of melamine |
| WO2001000596A2 (en) * | 1999-06-29 | 2001-01-04 | Dsm N.V. | Process for separating melamine from melamine-containing gas mixtures |
| CN101891695A (en) * | 2010-07-27 | 2010-11-24 | 山西阳煤丰喜肥业(集团)有限责任公司 | Normal pressure one-step circulation method of melamine |
| CN201971766U (en) * | 2011-04-28 | 2011-09-14 | 四川金圣赛瑞化工有限责任公司 | Energy-saving less-investment gaseous quenching melamine production system |
| CN102219754A (en) * | 2011-04-28 | 2011-10-19 | 四川金圣赛瑞化工有限责任公司 | Energy-saving and resource-saving system and process for producing melamine by using gas-phase quenching process |
| WO2012046056A1 (en) * | 2010-10-06 | 2012-04-12 | Ulster Carpet Mills (Holdings) Limited | Apparatus and method for loading tufts into a tuft carrier |
| CN102558079A (en) * | 2011-12-30 | 2012-07-11 | 南通紫鑫实业有限公司 | Process for producing melamine |
| CN203269828U (en) * | 2013-06-18 | 2013-11-06 | 尹明大 | Tripolycyanamide production system |
| CN103601693A (en) * | 2013-10-23 | 2014-02-26 | 李东田 | One-step method used for production of melamine by circulating ammonia gas as carrying gas |
-
2014
- 2014-10-30 CN CN201410593505.3A patent/CN104277006A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328401A (en) * | 1964-02-11 | 1967-06-27 | Chemical Construction Corp | Synthesis of melamine |
| WO2001000596A2 (en) * | 1999-06-29 | 2001-01-04 | Dsm N.V. | Process for separating melamine from melamine-containing gas mixtures |
| CN101891695A (en) * | 2010-07-27 | 2010-11-24 | 山西阳煤丰喜肥业(集团)有限责任公司 | Normal pressure one-step circulation method of melamine |
| WO2012046056A1 (en) * | 2010-10-06 | 2012-04-12 | Ulster Carpet Mills (Holdings) Limited | Apparatus and method for loading tufts into a tuft carrier |
| CN201971766U (en) * | 2011-04-28 | 2011-09-14 | 四川金圣赛瑞化工有限责任公司 | Energy-saving less-investment gaseous quenching melamine production system |
| CN102219754A (en) * | 2011-04-28 | 2011-10-19 | 四川金圣赛瑞化工有限责任公司 | Energy-saving and resource-saving system and process for producing melamine by using gas-phase quenching process |
| CN102558079A (en) * | 2011-12-30 | 2012-07-11 | 南通紫鑫实业有限公司 | Process for producing melamine |
| CN203269828U (en) * | 2013-06-18 | 2013-11-06 | 尹明大 | Tripolycyanamide production system |
| CN103601693A (en) * | 2013-10-23 | 2014-02-26 | 李东田 | One-step method used for production of melamine by circulating ammonia gas as carrying gas |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381627A (en) * | 2015-12-14 | 2016-03-09 | 尹明大 | Melamine fluidized bed crystallizer |
| CN106083752A (en) * | 2016-06-12 | 2016-11-09 | 山东省舜天化工集团有限公司 | A kind of steam cooler cleaning plant based on Melamine Production |
| CN106083752B (en) * | 2016-06-12 | 2020-04-21 | 山东省舜天化工集团有限公司 | A hot gas cooler cleaning device based on melamine production |
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Application publication date: 20150114 |