CN116920601A - System and method for purifying industrial tail gas containing hydrogen cyanide - Google Patents
System and method for purifying industrial tail gas containing hydrogen cyanide Download PDFInfo
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- CN116920601A CN116920601A CN202310737563.8A CN202310737563A CN116920601A CN 116920601 A CN116920601 A CN 116920601A CN 202310737563 A CN202310737563 A CN 202310737563A CN 116920601 A CN116920601 A CN 116920601A
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
本申请涉及工业尾气的净化技术领域，尤其涉及一种净化含氰化氢工业尾气的系统及方法；所述系统包括：氰化氢吸收单元，包括水洗塔、氨水吸收池和电捕焦塔，水洗塔的出液口连通氨水吸收池，氨水吸收池的出液口连通水洗塔的进液口，水洗塔的出料口连通电捕焦塔的进料口；氧化再生单元，包括氧化再生池、气液分离器、加料部和吸附塔，吸附塔的进料口连通电捕焦塔的出料口，吸附塔的出料口连通氧化再生池的进料口，吸附塔的出气口连通气液分离器的进气口，气液分离器的出液口连通氧化再生池，加料部的出料口连通氧化再生池；该系统可以实现工业尾气中氰化氢的无害化净化，可以有效的解决氰化氢的污染问题。
This application relates to the technical field of industrial exhaust gas purification, and in particular to a system and method for purifying industrial exhaust gas containing hydrogen cyanide; the system includes: a hydrogen cyanide absorption unit, including a water washing tower, an ammonia water absorption pool and an electric coke capture tower, The liquid outlet of the water washing tower is connected to the ammonia water absorption tank, the liquid outlet of the ammonia water absorption tank is connected to the liquid inlet of the water washing tower, and the outlet of the water washing tower is connected to the feed port of the electric coke trapping tower; the oxidation regeneration unit includes an oxidation regeneration tank. , gas-liquid separator, feeding part and adsorption tower. The feed port of the adsorption tower is connected to the discharge port of the electric coke trap tower. The discharge port of the adsorption tower is connected to the feed port of the oxidation regeneration tank. The air outlet of the adsorption tower is connected to the gas outlet. The air inlet of the liquid separator and the liquid outlet of the gas-liquid separator are connected to the oxidation regeneration tank, and the outlet of the feeding part is connected to the oxidation regeneration tank; this system can achieve harmless purification of hydrogen cyanide in industrial exhaust gas and can effectively to solve the problem of hydrogen cyanide pollution.
Description
Technical Field
The application relates to the technical field of industrial tail gas purification, in particular to a system and a method for purifying industrial tail gas containing hydrogen cyanide.
Background
The fuel ethanol and biodiesel can replace gasoline and diesel, so the fuel ethanol and biodiesel are the most accepted alternative fuels with development prospect. At present, the tail gas of the silicomanganese alloy submerged arc furnace (the main component is carbon monoxide) is used as a raw material, and usable fuel ethanol can be produced through the processes of buffering, compression, deoxidization, biological fermentation, distillation dehydration and the like, so that a new industrial chain direction is opened up for the high-quality development of clean energy industry. Meanwhile, the method also accords with national energy development policies and environmental policies, and obtains good social benefits and economic benefits.
The tail gas of the silicomanganese alloy submerged arc furnace is industrial gas with relatively complex components, and the gas is required to be subjected to compression, adsorption, heating, deoxidation, filtration and other technological treatments before being used in a fermentation section so as to meet the use requirements of fermentation strains. However, through detection, the tail gas of the silicomanganese alloy submerged arc furnace contains a certain amount of toxic substances harmful to fermentation strains and deoxidizing catalysts, and the conventional gas purification process cannot effectively remove the impurities and can influence fermentation operation, wherein hydrogen cyanide impurities are represented by the hydrogen cyanide impurities, the toxicity of the hydrogen cyanide impurities is high, and the normal propagation and growth of the strains in the biological fermentation process can be influenced by the presence of a large amount of hydrogen cyanide impurities, so that the yield of final fuel ethanol is influenced; therefore, how to provide a system and a method for purifying industrial tail gas containing hydrogen cyanide, so as to effectively solve the problem of hydrogen cyanide pollution, and the technical problem to be solved is urgent at present.
Disclosure of Invention
The application provides a system and a method for purifying industrial tail gas containing hydrogen cyanide, which are used for solving the technical problem that hydrogen cyanide impurities in the tail gas of a silicomanganese alloy submerged arc furnace are difficult to remove in the prior art.
In a first aspect, the present application provides a system for purifying an industrial tail gas comprising hydrogen cyanide, the system comprising:
the hydrogen cyanide absorption unit comprises a water washing tower, an ammonia absorption tank and an electric coke-capturing tower, wherein the liquid outlet of the water washing tower is communicated with the ammonia absorption tank, the liquid outlet of the ammonia absorption tank is communicated with the liquid inlet of the water washing tower, and the liquid outlet of the water washing tower is communicated with the feed inlet of the electric coke-capturing tower;
the oxidation regeneration unit comprises an oxidation regeneration tank, a gas-liquid separator, a feeding part and an adsorption tower, wherein a feeding hole of the adsorption tower is communicated with a discharging hole of the electric coke-capturing tower, a discharging hole of the adsorption tower is communicated with a feeding hole of the oxidation regeneration tank, an air outlet of the adsorption tower is communicated with an air inlet of the gas-liquid separator, a liquid outlet of the gas-liquid separator is communicated with the oxidation regeneration tank, and a discharging hole of the feeding part is communicated with the oxidation regeneration tank.
Optionally, the hydrogen cyanide absorption unit further comprises a first spray pump and a first absorption liquid spray device, wherein the first absorption liquid spray device is arranged in the water washing tower, a liquid inlet of the first spray pump is communicated with the ammonia water absorption tank, and a liquid outlet of the first spray pump is communicated with the first absorption liquid spray device.
Optionally, the oxidation regeneration unit further comprises a second spray pump and a second absorption liquid spray device, the second absorption liquid spray device is arranged in the adsorption tower, a liquid inlet of the second spray pump is communicated with the oxidation regeneration tank, and a liquid outlet of the second spray pump is communicated with the second absorption liquid spray device.
Optionally, the oxidation regeneration unit further includes a plurality of spoilers, a plurality of the spoilers are disposed in the adsorption tower, and the spoilers are disposed on two sides of the second absorption liquid spraying device.
Optionally, the oxidation regeneration unit further comprises a drip catcher, and the drip catcher is arranged at the top of the adsorption tower.
Optionally, the oxidation regeneration unit further comprises an aeration disc and an aeration fan, wherein the aeration disc is arranged in the oxidation regeneration tank, and an air inlet of the aeration disc is communicated with an air outlet of the aeration fan.
Optionally, the charging part comprises a copper sulfate flowmeter, a palladium sulfate flowmeter and an absorption liquid mixing pool, wherein the copper sulfate flowmeter and a discharge port of the palladium sulfate flowmeter are respectively communicated with a feed inlet of the absorption liquid mixing pool, and a liquid outlet of the absorption liquid mixing pool is communicated with the oxidation regeneration pool.
Optionally, the charging part further comprises a stirrer and a dosing pump, the stirrer is arranged in the absorption liquid mixing tank, a liquid inlet of the dosing pump is communicated with a liquid outlet of the absorption liquid mixing tank, and a liquid outlet of the dosing pump is communicated with the oxidation regeneration tank.
In a second aspect, the present application provides a method for purifying an industrial tail gas containing hydrogen cyanide, the method being adapted to the system of the first aspect, the method comprising:
mixing copper sulfate and palladium sulfate to obtain an absorption liquid;
washing the raw material gas with water and electrically catching coke to obtain a primary purified raw material gas containing hydrogen cyanide;
mixing the absorption liquid and the primary purification raw material gas in a countercurrent contact mode, and adsorbing to obtain a mixed catalyst solution for absorbing hydrogen cyanide and a crude raw material gas respectively;
carrying out gas-liquid separation on the crude feed gas to obtain purified feed gas;
the mixed catalytic solution is subjected to oxidative regeneration to oxidize cyanide to nitrogen, carbon dioxide, and water.
Optionally, the mass concentration of copper ions in the absorption liquid is 0.1 g/L-150 g/L, and the mass concentration of palladium ions in the absorption liquid is 0.05 g/L-50 g/L.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the hydrogen cyanide absorption unit comprises a water washing tower, an ammonia water absorption tank, an electric coke-capturing tower and an absorption tower, wherein part of hydrogen cyanide in the industrial tail gas is contacted with palladium ions to generate indissolvable palladium simple substance after being contacted and reacted with the palladium ions, part of hydrogen cyanide is oxidized to form indissolvable phosphor copper, and part of hydrogen cyanide is oxidized to phosphoric acid, so that the hydrogen cyanide in the tail gas is purified, the absorption liquid of the hydrogen cyanide is further oxidized to the oxidation regeneration tank to be subjected to subsequent oxidation, the hydrogen cyanide is converted to palladium ions, the palladium ions and the divalent hydrogen cyanide ions are separated to form harmless gas after being separated to the gas phase of the tail gas, and the problem of pollution of the industrial tail gas is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a system for purifying industrial tail gas containing hydrogen cyanide according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a system for purifying industrial tail gas containing hydrogen cyanide according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of a method for purifying industrial tail gas containing hydrogen cyanide according to an embodiment of the present application;
the device comprises a 1-water washing tower, a 2-ammonia water absorption tank, a 3-electric coke-capturing tower, a 4-oxidation regeneration tank, a 5-gas-liquid separator, a 6-feeding part, a 61-copper sulfate flowmeter, a 62-palladium sulfate flowmeter, a 63-absorption liquid mixing tank, an 8-absorption tower, a 9-first spray pump, a 10-first absorption liquid spray device, a 11-second spray pump, a 12-second absorption liquid spray device, a 13-spoiler, a 14-drip catcher, a 15-aeration disc, a 16-aeration fan, a 17-stirrer and an 18-dosing pump.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "fixed" may be a fixed connection, may be a removable connection, or may be integral, may be a mechanical connection, or may be an electrical connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1 and 2, an embodiment of the present application provides a system for purifying an industrial tail gas containing hydrogen cyanide, the system comprising:
the hydrogen cyanide absorption unit comprises a water washing tower 1, an ammonia water absorption tank 2 and an electric coke-capturing tower 3, wherein a liquid outlet of the water washing tower 1 is communicated with the ammonia water absorption tank 2, a liquid outlet of the ammonia water absorption tank 2 is communicated with a liquid inlet of the water washing tower 1, and a liquid outlet of the water washing tower 1 is communicated with a feed inlet of the electric coke-capturing tower 3;
the oxidation regeneration unit, the oxidation regeneration unit includes oxidation regeneration pond 4, gas-liquid separator 5, charging portion 6 and adsorption tower 8, the feed inlet intercommunication of adsorption tower 8 the discharge gate of electric coke-tar precipitator tower 3, the discharge gate intercommunication of adsorption tower 8 the feed inlet of oxidation regeneration pond 4, the gas outlet intercommunication of adsorption tower 8 the air inlet of gas-liquid separator 5, the liquid outlet intercommunication of gas-liquid separator 5 oxidation regeneration pond 4, the discharge gate intercommunication of charging portion 6 oxidation regeneration pond 4.
In the embodiment of the application, the control valves such as the manual valve or the adjusting valve can be respectively arranged among the components of the system according to the actual operation conditions and used for controlling the flow and the pressure of the gas and the liquid in the system, ensuring that the system can continuously and stably run and being convenient for the adjustment of the running parameters of the whole process.
In order to ensure the automatic operation of the whole system, the system can be further provided with pressure sensors, temperature sensors and other automatic control instruments, and the pressure sensors, the temperature sensors and other automatic control instruments are arranged in the system according to the operation characteristics of the system, so that the automatic adjustment function of the system is realized, and the safe operation of the system is ensured.
The automatic control instrument and the control valve are connected with control equipment and are connected with a DCS (distributed control system) automatic control system which is arranged in a system implementation master control room.
The control device can be a control terminal, and an interface for operation can be arranged on the control device, and real-time data of valve opening, temperature and pressure can be checked through the operation interface.
The control valve can be an electric control valve or a pneumatic control valve;
the temperature instrument of the self-control instrument can be a temperature transmitter, an infrared thermometer or a thermocouple;
the pressure transmitter of the self-control instrument can be a capacitive pressure transmitter or an intelligent pressure transmitter.
In some alternative embodiments, the hydrogen cyanide absorption unit further comprises a first spray pump 9 and a first absorption liquid spray device 10, the first absorption liquid spray device 10 is arranged in the water scrubber 1, a liquid inlet of the first spray pump 9 is communicated with the ammonia water absorption tank 2, and a liquid outlet of the first spray pump 9 is communicated with the first absorption liquid spray device 10.
In the embodiment of the application, by introducing the first spray pump 9 and the first absorption liquid spray device 10, the ammonia water in the ammonia water absorption tank 2 can be conveyed into the first absorption liquid spray device 10 through the first spray pump 9, so that the ammonia water is atomized, dust and tar impurities in industrial tail gas are primarily removed through atomized ammonia water, and meanwhile, hydrogen cyanide impurities can be primarily absorbed.
In some alternative embodiments, the oxidation regeneration unit further includes a second spray pump 11 and a second absorption liquid spray device 12, the second absorption liquid spray device 12 is disposed in the adsorption tower 8, a liquid inlet of the second spray pump 11 is communicated with the oxidation regeneration tank 4, and a liquid outlet of the second spray pump 11 is communicated with the second absorption liquid spray device 12.
In the embodiment of the application, the second spray pump 11 and the second absorption liquid spray device 12 are introduced, the absorption liquid in the oxidation regeneration tank 4 can be conveyed into the second absorption liquid spray device 12 by utilizing the second spray pump 11, and the absorption liquid is formed into spray liquid by the second absorption liquid spray device 12, so that partial hydrogen cyanide impurity in the industrial tail gas and palladium ions are contacted and reacted to generate indissolvable palladium simple substances, meanwhile, partial hydrogen cyanide impurity and copper ions generate indissolvable phosphor copper, and meanwhile, partial hydrogen cyanide is oxidized into phosphoric acid, and all the formed substances enter a liquid phase, so that the removal of the hydrogen cyanide impurity in the industrial tail gas is realized.
In some alternative embodiments, the oxidation regeneration unit further includes a plurality of spoilers 13, and a plurality of spoilers 13 are disposed in the adsorption tower 8, and the spoilers 13 are disposed on two sides of the second absorption liquid spraying device 12.
In the embodiment of the application, the spoiler 13 is introduced to disturb the spray liquid formed by spraying the absorption liquid, so that the contact time of the gas and the liquid is prolonged, the absorption liquid can fully absorb the hydrogen cyanide, and the removal efficiency of the hydrogen cyanide is realized.
In some alternative embodiments, the oxidation regeneration unit further comprises a drip catcher 14, the drip catcher 14 being provided at the top of the adsorption tower 8.
In the embodiment of the application, the drip catcher 14 is introduced into the oxidation regeneration unit, so that the drip catcher 14 can be utilized to effectively reduce liquid water molecules in the industrial tail gas, and meanwhile, the liquid water molecules in the air can be furthest reduced from entering the industrial tail gas, thereby being convenient for later gas-liquid separation to obtain pure industrial tail gas.
In some alternative embodiments, the oxidation and regeneration unit further comprises an aeration disc 15 and an aeration fan 16, wherein the aeration disc 15 is arranged in the oxidation and regeneration tank 4, and an air inlet of the aeration disc 15 is communicated with an air outlet of the aeration fan 16.
According to the embodiment of the application, the aeration disc 15 and the aeration fan 16 are introduced, a large amount of sealing is introduced by using the aeration fan 16, the aeration amount is increased, and meanwhile, the aeration disc 15 is matched to ensure that air is uniformly distributed, so that the palladium ions and copper ions are uniformly mixed, and the later-stage absorption liquid and the hydrogen cyanide impurities in the industrial tail gas can be conveniently and completely reacted.
In some alternative embodiments, the feeding portion 6 includes a copper sulfate flow meter 61, a palladium sulfate flow meter 62, and an absorption liquid mixing tank 63, where discharge ports of the copper sulfate flow meter 61 and the palladium sulfate flow meter 62 are respectively connected to a feed port of the absorption liquid mixing tank 63, and a discharge port of the absorption liquid mixing tank 63 is connected to the oxidation regeneration tank 4.
In the embodiment of the application, the specific equipment of the refining feeding part 6 is utilized to respectively control the specific mass of the copper sulfate and the palladium sulfate entering the absorption liquid mixing tank 63 by utilizing the copper sulfate flowmeter 61 and the palladium sulfate flowmeter 62, thereby obtaining the absorption liquid with proper copper ion content and palladium ion content, and then the absorption liquid is input into the oxidation regeneration tank 4 through the absorption liquid mixing tank 63, so that the hydrogen cyanide impurity in the industrial tail gas can be removed.
In some optional embodiments, the feeding part 6 further includes a stirrer 17 and a dosing pump 18, the stirrer 17 is disposed in the absorption liquid mixing tank 63, a liquid inlet of the dosing pump 18 is connected to a liquid outlet of the absorption liquid mixing tank 63, and a liquid outlet of the dosing pump 18 is connected to the oxidation regeneration tank 4.
In the embodiment of the application, the stirrer 17 and the dosing pump 18 are introduced into the feeding part 6, the stirrer 17 is utilized to stir and mix the palladium sulfate and the copper sulfate in the absorption liquid mixing tank 63 uniformly, and the dosing pump 18 is utilized to pump the absorption liquid into the oxidation regeneration tank 4, so that the subsequent industrial tail gas and the absorption liquid can be conveniently and completely reacted in the adsorption tower 8, and the hydrogen cyanide impurity in the industrial tail gas is removed.
As shown in fig. 3, based on one general inventive concept, the present application provides a method of purifying hydrogen cyanide-containing industrial tail gas, the method being adapted to the system of the first aspect, the method comprising:
s1, mixing copper sulfate and palladium sulfate to obtain an absorption liquid;
s2, washing the raw material gas with water and electrically catching coke to obtain a primary purified raw material gas containing hydrogen cyanide;
s3, mixing the absorption liquid and the primary purification raw material gas in a countercurrent contact mode, and adsorbing to obtain a mixed catalyst solution for absorbing hydrogen cyanide and a crude raw material gas respectively;
s4, performing gas-liquid separation on the crude feed gas to obtain purified feed gas;
s5, oxidizing and regenerating the mixed catalytic solution to oxidize the cyanide into nitrogen, carbon dioxide and water.
The method is realized based on the system, the specific structural composition of the system can refer to the embodiment, and as the method adopts part or all of the technical schemes of the embodiment, the method at least has all the beneficial effects brought by the technical schemes of the embodiment, and the detailed description is omitted.
In some alternative embodiments, the mass concentration of copper ions in the absorption liquid is 0.1g/L to 150g/L, and the mass concentration of palladium ions in the absorption liquid is 0.05g/L to 50g/L.
In the embodiment of the application, the specific mass concentration of copper ions and palladium ions in the absorption liquid is controlled, because part of hydrogen cyanide in the industrial tail gas can be contacted with the palladium ions to react to generate indissolvable palladium simple substance, part of hydrogen cyanide and copper ions generate indissolvable phosphor copper, and part of hydrogen cyanide is oxidized into phosphoric acid, and all of the phosphoric acid enter a liquid phase, the specific mass concentration is controlled, so that indissolvable palladium simple substance is generated after the hydrogen cyanide and the palladium ions are completely contacted and reacted, and part of hydrogen cyanide and copper ions are completely generated to indissolvable phosphor copper, thereby removing hydrogen cyanide impurities in the industrial tail gas.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
As shown in fig. 1 and 2, a system for purifying an industrial tail gas containing hydrogen cyanide, comprising:
the hydrogen cyanide absorption unit comprises a water washing tower 1, an ammonia water absorption tank 2 and an electric coke-capturing tower 3, wherein a liquid outlet of the water washing tower 1 is communicated with the ammonia water absorption tank 2, a liquid outlet of the ammonia water absorption tank 2 is communicated with a liquid inlet of the water washing tower 1, and a discharge outlet of the water washing tower 1 is communicated with a feed inlet of the electric coke-capturing tower 3;
the oxidation regeneration unit comprises an oxidation regeneration tank 4, a gas-liquid separator 5, a feeding part 6 and an adsorption tower 8, wherein a feeding hole of the adsorption tower 8 is communicated with a discharging hole of the electric coke-capturing tower 3, a discharging hole of the adsorption tower 8 is communicated with a feeding hole of the oxidation regeneration tank 4, an air outlet of the adsorption tower 8 is communicated with an air inlet of the gas-liquid separator 5, a liquid outlet of the gas-liquid separator 5 is communicated with the oxidation regeneration tank 4, and a discharging hole of the feeding part 6 is communicated with the oxidation regeneration tank 4.
The hydrogen cyanide absorption unit further comprises a first spray pump 9 and a first absorption liquid spray device 10, wherein the first absorption liquid spray device 10 is arranged in the water scrubber 1, a liquid inlet of the first spray pump 9 is communicated with the ammonia water absorption tank 2, and a liquid outlet of the first spray pump 9 is communicated with the first absorption liquid spray device 10.
The oxidation regeneration unit further comprises a second spray pump 11 and a second absorption liquid spray device 12, the second absorption liquid spray device 12 is arranged in the adsorption tower 8, a liquid inlet of the second spray pump 11 is communicated with the oxidation regeneration tank 4, and a liquid outlet of the second spray pump 11 is communicated with the second absorption liquid spray device 12.
The oxidation regeneration unit further comprises a plurality of spoilers 13, the spoilers 13 are arranged in the adsorption tower 8, and the spoilers 13 are arranged on two sides of the second absorption liquid spraying device 12.
The oxidation regeneration unit also comprises a drip catcher 14, and the drip catcher 14 is arranged at the top of the adsorption tower 8.
The oxidation regeneration unit also comprises an aeration disc 15 and an aeration fan 16, wherein the aeration disc 15 is arranged in the oxidation regeneration tank 4, and an air inlet of the aeration disc 15 is communicated with an air outlet of the aeration fan 16.
The feeding part 6 comprises a copper sulfate flowmeter 61, a palladium sulfate flowmeter 62 and an absorption liquid mixing pool 63, wherein the discharge ports of the copper sulfate flowmeter 61 and the palladium sulfate flowmeter 62 are respectively communicated with the feed inlet of the absorption liquid mixing pool 63, and the discharge port of the absorption liquid mixing pool 63 is communicated with the oxidation regeneration pool 4.
The feeding part 6 further comprises a stirrer 17 and a dosing pump 18, wherein the stirrer 17 is arranged in the absorption liquid mixing pool 63, the liquid inlet of the dosing pump 18 is communicated with the liquid outlet of the absorption liquid mixing pool 63, and the liquid outlet of the dosing pump 18 is communicated with the oxidation regeneration pool 4.
Example 2
Example 2 and example 1 were compared, and the difference between example 2 and example 1 is that:
as shown in fig. 3, a method for purifying industrial tail gas containing hydrogen cyanide, comprising:
s1, mixing copper sulfate and palladium sulfate to obtain an absorption liquid;
s2, washing the raw material gas with water and electrically catching coke to obtain a primary purified raw material gas containing hydrogen cyanide;
s3, mixing the absorption liquid and the primary purification raw material gas in a countercurrent contact mode, and adsorbing to obtain a mixed catalyst solution for absorbing hydrogen cyanide and a crude raw material gas respectively;
s4, performing gas-liquid separation on the crude feed gas to obtain purified feed gas;
s5, carrying out oxidation regeneration on the mixed catalytic solution so as to oxidize the hydrogen cyanide into nitrogen, carbon dioxide and water.
The mass concentration of copper ions in the absorption liquid is 100g/L, and the mass concentration of palladium ions in the absorption liquid is 30g/L.
Example 3
Example 3 and example 2 are compared, and the difference between example 3 and example 2 is that:
the mass concentration of copper ions in the absorption liquid is 0.1g/L, and the mass concentration of palladium ions in the absorption liquid is 0.05g/L.
Example 4
Example 4 and example 2 were compared, and example 4 and example 2 differ in that:
the mass concentration of copper ions in the absorption liquid is 150g/L, and the mass concentration of palladium ions in the absorption liquid is 50g/L.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
(1) The system for purifying the hydrogen cyanide-containing industrial tail gas provided by the embodiment of the application adopts the process of absorbing and oxidizing hydrogen cyanide stepwise, firstly removes hydrogen cyanide from the hydrogen cyanide-containing tail gas, and then oxidizes the hydrogen cyanide into nitrogen, carbon dioxide and water, so that the pollution problem of the hydrogen cyanide can be effectively removed, and the directional removal of the hydrogen cyanide in the industrial tail gas can be realized, thereby protecting fermentation strains from poisoning.
(2) According to the system for purifying the industrial tail gas containing hydrogen cyanide, provided by the embodiment of the application, the industrial tail gas obtained by treatment can improve the yield of fuel ethanol products.
(3) The method for purifying the industrial tail gas containing hydrogen cyanide provided by the embodiment of the application provides a practical purification method for coal gas as a raw material of a carbonization industry.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A system for purifying an industrial tail gas comprising hydrogen cyanide, the system comprising:
the hydrogen cyanide absorption unit comprises a water washing tower (1), an ammonia water absorption tank (2) and an electric coke-capturing tower (3), wherein a liquid outlet of the water washing tower (1) is communicated with the ammonia water absorption tank (2), a liquid outlet of the ammonia water absorption tank (2) is communicated with a liquid inlet of the water washing tower (1), and a liquid outlet of the water washing tower (1) is communicated with a feed inlet of the electric coke-capturing tower (3);
the oxidation regeneration unit, the oxidation regeneration unit includes oxidation regeneration pond (4), gas-liquid separator (5), charge portion (6) and adsorption tower (8), the feed inlet intercommunication of adsorption tower (8) the discharge gate of electric coke-tar precipitator tower (3), the discharge gate intercommunication of adsorption tower (8) the feed inlet of oxidation regeneration pond (4), the gas outlet intercommunication of adsorption tower (8) the air inlet of gas-liquid separator (5), the liquid outlet intercommunication of gas-liquid separator (5) oxidation regeneration pond (4), the discharge gate intercommunication of charge portion (6) oxidation regeneration pond (4).
2. The system according to claim 1, wherein the hydrogen cyanide absorption unit further comprises a first spray pump (9) and a first absorption liquid spray device (10), the first absorption liquid spray device (10) is arranged in the water scrubber (1), a liquid inlet of the first spray pump (9) is communicated with the ammonia water absorption tank (2), and a liquid outlet of the first spray pump (9) is communicated with the first absorption liquid spray device (10).
3. The system according to claim 1, wherein the oxidation regeneration unit further comprises a second spray pump (11) and a second absorption liquid spray device (12), the second absorption liquid spray device (12) is arranged in the adsorption tower (8), a liquid inlet of the second spray pump (11) is communicated with the oxidation regeneration tank (4), and a liquid outlet of the second spray pump (11) is communicated with the second absorption liquid spray device (12).
4. A system according to claim 3, characterized in that the oxidation regeneration unit further comprises a plurality of spoilers (13), a plurality of spoilers (13) being arranged in the adsorption tower (8), the spoilers (13) being arranged on both sides of the second absorption liquid spray device (12).
5. A system according to claim 3, characterized in that the oxidation regeneration unit further comprises a drip catcher (14), the drip catcher (14) being arranged at the top of the adsorption column (8).
6. The system according to claim 1, wherein the oxidation regeneration unit further comprises an aeration disc (15) and an aeration fan (16), the aeration disc (15) is arranged in the oxidation regeneration tank (4), and an air inlet of the aeration disc (15) is communicated with an air outlet of the aeration fan (16).
7. The system according to claim 1, wherein the feeding portion (6) comprises a copper sulfate flowmeter (61), a palladium sulfate flowmeter (62) and an absorption liquid mixing tank (63), discharge ports of the copper sulfate flowmeter (61) and the palladium sulfate flowmeter (62) are respectively communicated with a feed port of the absorption liquid mixing tank (63), and a discharge port of the absorption liquid mixing tank (63) is communicated with the oxidation regeneration tank (4).
8. The system according to claim 7, wherein the feeding portion (6) further comprises a stirrer (17) and a dosing pump (18), the stirrer (17) is arranged in the absorption liquid mixing tank (63), a liquid inlet of the dosing pump (18) is communicated with a liquid outlet of the absorption liquid mixing tank (63), and a liquid outlet of the dosing pump (18) is communicated with the oxidation regeneration tank (4).
9. A method for purifying an industrial tail gas containing hydrogen cyanide, wherein the method is adapted to the system of any of claims 1-8, the method comprising:
mixing copper sulfate and palladium sulfate to obtain an absorption liquid;
washing the raw material gas with water and electrically catching coke to obtain a primary purified raw material gas containing hydrogen cyanide;
mixing the absorption liquid and the primary purification raw material gas in a countercurrent contact mode, and adsorbing to obtain a mixed catalyst solution for absorbing hydrogen cyanide and a crude raw material gas respectively;
carrying out gas-liquid separation on the crude feed gas to obtain purified feed gas;
the mixed catalytic solution is subjected to oxidative regeneration to oxidize cyanide to nitrogen, carbon dioxide, and water.
10. The method according to claim 9, wherein the mass concentration of copper ions in the absorption liquid is 0.1g/L to 150g/L, and the mass concentration of palladium ions in the absorption liquid is 0.05g/L to 50g/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310737563.8A CN116920601A (en) | 2023-06-20 | 2023-06-20 | System and method for purifying industrial tail gas containing hydrogen cyanide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310737563.8A CN116920601A (en) | 2023-06-20 | 2023-06-20 | System and method for purifying industrial tail gas containing hydrogen cyanide |
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Citations (5)
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| CN101269297A (en) * | 2008-05-21 | 2008-09-24 | 昆明理工大学 | Catalytic oxidation purification method for hydrogen cyanide in industrial waste gas |
| CN101484230A (en) * | 2006-04-28 | 2009-07-15 | 赫多特普索化工设备公司 | Process for the removal of hydrogen cyanide and formic acid from synthesis gas |
| CN105688565A (en) * | 2016-02-04 | 2016-06-22 | 云南旭光节能有限公司 | Metallurgical mine calcining tail gas purifying and heat recycling device and process |
| CN114159922A (en) * | 2021-11-10 | 2022-03-11 | 宁夏首朗吉元新能源科技有限公司 | Ferroalloy tail gas clean-up system |
| CN116202331A (en) * | 2023-03-21 | 2023-06-02 | 四川川锅锅炉有限责任公司 | Near zero emission system for deep utilization of tail gas of silicomanganese ore heating furnace |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101484230A (en) * | 2006-04-28 | 2009-07-15 | 赫多特普索化工设备公司 | Process for the removal of hydrogen cyanide and formic acid from synthesis gas |
| CN101269297A (en) * | 2008-05-21 | 2008-09-24 | 昆明理工大学 | Catalytic oxidation purification method for hydrogen cyanide in industrial waste gas |
| CN105688565A (en) * | 2016-02-04 | 2016-06-22 | 云南旭光节能有限公司 | Metallurgical mine calcining tail gas purifying and heat recycling device and process |
| CN114159922A (en) * | 2021-11-10 | 2022-03-11 | 宁夏首朗吉元新能源科技有限公司 | Ferroalloy tail gas clean-up system |
| CN116202331A (en) * | 2023-03-21 | 2023-06-02 | 四川川锅锅炉有限责任公司 | Near zero emission system for deep utilization of tail gas of silicomanganese ore heating furnace |
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