CN216062720U - SO in flue gas3Removal system of - Google Patents
SO in flue gas3Removal system of Download PDFInfo
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- CN216062720U CN216062720U CN202122568088.5U CN202122568088U CN216062720U CN 216062720 U CN216062720 U CN 216062720U CN 202122568088 U CN202122568088 U CN 202122568088U CN 216062720 U CN216062720 U CN 216062720U
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Abstract
The utility model provides SO in flue gas3The removal system comprises a desulfurization device, an injection system and a flue gas pipeline, wherein an outlet of the flue gas pipeline is communicated with an inlet of the desulfurization device, and the injection system is used forThe spray gun is communicated with a flue gas pipeline; the spraying system comprises a dissolving tank, a dilute solution tank and a spray gun which are sequentially communicated; a liquid inlet of the dissolving tank is connected with an outlet of a process water pipeline, a material inlet of the dissolving tank is connected with a desulfurizer powder feeding mechanism, and a stirrer is arranged in the dissolving tank; the SO in the flue gas3The removal system ensures that the desulfurizer solution is in a state close to saturation by controlling the adding amount of the desulfurizer and water in the dissolving tank, ensures that the desulfurizer used in the injection system can be fully dissolved by fully stirring the stirrer, and can effectively avoid the condition that the solid desulfurizer blocks corresponding pipelines.
Description
Technical Field
The utility model relates to the technical field of flue gas treatment, in particular to SO in flue gas3The removal system of (1).
Background
In industrial processes in the fields of coal electricity, chemical industry and the like, particularly in processes involving heat treatment steps (drying, roasting, burning, etc.), exhaust gases such as tail gas or flue gas containing pollutants, for example, containing SO, are generatedx、NOx、Cl2And HCl and other pollutants and harmful gases, and the flue gas and the tail gas containing the pollutants and the harmful gases are always purified and then can be discharged after reaching the standard.
In the prior art, a wet flue gas treatment technology using a wet scrubbing tower as a core device is widely used for flue gas and tail gas purification treatment in industrial processes such as power generation, petrochemical industry, inorganic chemical industry and the like. Although the technological process and structure are different, the basic principle is that pollutants in a gas phase are absorbed into a liquid phase through gas-liquid contact, so that the aim of purifying flue gas or tail gas is fulfilled. But in response to SO in the flue gasxIn the treatment process, the wet treatment technology can more efficiently treat SO2Removal of SO3The removal process is often low in efficiency, so that the flue gas treated by the wet method still contains a certain amount of sulfur trioxide, and if the flue gas is directly discharged, the problems of acid rain and the like can be caused, and the problem of acid rain and the like can be solved for plant areas and plantsThe surrounding production and living environment cause serious effects.
For this reason, the applicant has focused on SO in flue gases3The removal of SO from the solution of the desulfurizing agent is studied and a patent application with application number CN202010686692.5 was proposed in the early days, in which a desulfurizing agent solution is sprayed into desulfurizing agent solid particles by means of spray-drying, and SO is removed from the desulfurizing agent solid particles3And removing. However, the applicant finds in the actual production application: in the removal system applied in the early period, before the spraying of the desulfurizer solution, insufficient dissolution or supersaturation of the desulfurizer is easy to occur, so that the desulfurizer blocks a pipeline of the desulfurizer solution, even blocks a spray head.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to provide a method for producing SO in flue gas3The removal system aims at solving the problem of removing the SO in the flue gas in the prior art3In the process, the corresponding pipeline is blocked due to insufficient dissolution or supersaturation of the desulfurizer.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
SO in flue gas3The removal system comprises a desulfurization device, an injection system and a flue gas pipeline, wherein an outlet of the flue gas pipeline is communicated with an inlet of the desulfurization device, and the injection system is communicated with the flue gas pipeline through a spray gun; the spraying system comprises a dissolving tank, a dilute solution tank and a spray gun which are sequentially communicated; the liquid inlet of the dissolving tank is connected with the outlet of the process water pipeline, the feed inlet of the dissolving tank is connected with the desulfurizer powder feeding mechanism, and a stirrer is arranged in the dissolving tank.
Furthermore, a heating sleeve is sleeved on the outer wall of the dissolving tank.
Further, a heating device is arranged in the dilute solution tank and used for directly heating the desulfurizer solution; and the outer wall of the dilute solution tank is sleeved with a heat preservation device for carrying out integral heat preservation on the dilute solution tank.
Furthermore, the bottom of the dissolving tank is provided with a first sewage outlet, and the bottom of the dilute solution tank is provided with a second sewage outlet.
Further, an emptying pipe is arranged at the top of the dilute solution tank.
Furthermore, a second pump body is arranged between the dilute solution tank and the spray gun, an outlet of the second pump body is connected with a liquid inlet of the spray gun through a fourth conveying pipeline, and a first filter is arranged in the fourth conveying pipeline.
Furthermore, the dilute solution tank is provided with a return pipe, one end of the return pipe is connected with the dilute solution tank, and the other end of the return pipe is communicated with an outlet of the second pump body.
Preferably, the stirrer is a paddle stirrer.
Further, the injection system further comprises a compressed air pipe, and an outlet of the compressed air pipe is communicated with a gas inlet of the spray gun.
Further, the compressed air pipe is provided with a second filter.
Compared with the prior art, the utility model discloses SO in flue gas3The removal system of (a) has the following advantages:
the SO in the flue gas3The removing system sprays the fog drops of the desulfurizer solution into the high-temperature flue gas through the spraying system, and simultaneously, the fog drops are quickly evaporated to form desulfurizer solid particles under the action of the high-temperature flue gas, and the solid particles formed after the fog drops are evaporated have larger specific surface area and even have a porous structure, so that compared with the desulfurization process in the prior art, the contact area of the desulfurizer and the flue gas is increased to a certain extent, and the desulfurization process is favorable for improving the desulfurization efficiency of sulfide in the flue gas; on the other hand, compared with the wet desulphurization with lower desulphurization efficiency in the prior art, the solid particles of the desulfurizer formed by spray drying are directly mixed with SO3Contact and react to increase the desulfurizing agent and SO3Thereby being beneficial to improving SO in the flue gas treatment process3The removal efficiency of (2).
Meanwhile, the feeding amount of the desulfurizer and water is controlled in the dissolving tank, so that the desulfurizer solution is in a state close to saturation, the desulfurizer used in the injection system can be fully dissolved through full stirring of the stirrer, and the condition that the solid desulfurizer blocks a corresponding pipeline can be effectively avoided.
Further, after the desulfurizing agent is sufficiently dissolved, the desulfurizing agent solution in the dissolving tank is transferred to the dilute solution tank. The independent setting between dissolving tank, the dilute solution jar, the desulfurizer solution of treating to use on the one hand carries out individual storage, avoids receiving dissolving in the dissolving tank interference of process, and on the other hand can steadily ensure the supply of desulfurizer solution effectively in the spray gun working process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 shows SO in flue gas according to an embodiment of the present invention3Schematic structural diagram of the removal system (2).
Description of reference numerals:
1. a process water line; 2. a desulfurizer powder feeding mechanism; 3. a dissolving tank; 31. a stirrer; 32. a first drain port; 33. a first feed delivery pipe; 4. a first pump body; 5. a second delivery pipe; 6. a dilute solution tank; 61. an emptying pipe; 62. a second sewage draining outlet; 63. a third delivery pipe; 7. a second pump body; 8. a fourth feed delivery pipe; 9. a first filter; 10. a return pipe; 11. a compressed air pipe; 12. a second filter; 13. a spray gun; 14. a flue gas pipeline.
Detailed Description
The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Aiming at SO in flue gas3The applicant of the patent application with the application number of CN202010686692.5 in the early period, the desulfurizing agent solution is sprayed into desulfurizing agent solid particles by a spray rapid drying mode, and SO is removed by utilizing the desulfurizing agent solid particles3And removing. However, the applicant finds in the actual production application: in the removal system applied in the early period, before the spraying of the desulfurizer solution, insufficient dissolution or supersaturation of the desulfurizer is easy to occur, so that the desulfurizer blocks a pipeline of the desulfurizer solution, even blocks a spray head.
To solve the problem of removing SO in the flue gas3In the process, because the desulfurizer is not fully dissolved or is supersaturated, the problem of blockage of corresponding pipelines is solved, and the embodiment provides the SO in the flue gas3The desorption system, as shown in fig. 1, the desorption system includes desulphurization unit, injection system, flue gas pipeline 14, desulphurization unit is conventional desulfurizing tower, flue gas pipeline 14 is the pipeline that the high temperature flue gas flows, and flue gas pipeline 14 shown in this application figure 1 is only a small segment flue gas pipeline structure, just the export of flue gas pipeline 14 communicates with desulphurization unit's entry, injection system passes through spray gun 13 and flue gas pipeline 14 intercommunication for spray desulfurizer solution in flue gas pipeline 14, desulfurizer solution is sprayed into and is formed the droplet in flue gas pipeline 14, and the droplet is heated the drying in the twinkling of an eye by high temperature flue gas and is the solid-state particle of desulfurizer, the solid-state particle of desulfurizer carries out desulfurization reaction with the flue gas at least, specifically includes at least that SO removes at least3The reaction of (1);
therefore, before the high-temperature flue gas enters the desulfurization device, the fog drops of the desulfurizer solution are sprayed into the high-temperature flue gas through the spraying system, and simultaneously, under the action of the high-temperature flue gas, the fog drops are quickly evaporated to form desulfurizer solid particlesEfficiency; on the other hand, compared with the wet desulphurization with lower desulphurization efficiency in the prior art, the solid particles of the desulfurizer formed by spray drying are directly mixed with SO3Contact and react to increase the desulfurizing agent and SO3Thereby being beneficial to improving SO in the flue gas treatment process3The removal efficiency of (2).
Meanwhile, the flue gas is subjected to primary desulfurization by utilizing the desulfurizer solid particles formed by high-temperature drying of desulfurizer fog drops in the injection system, and the flue gas is subjected to secondary desulfurization by utilizing the desulfurization solution in a subsequent desulfurization tower, so that the content of sulfide in the flue gas is further reduced, and the desulfurization efficiency is improved; in addition, for the removal system, although a certain amount of solid particles of the desulfurizer are doped in the flue gas in the primary desulfurization process, the solid particles of the desulfurizer generated in the primary desulfurization process and other dust carried in the flue gas in the actual production process can be captured by the desulfurization solution in the secondary desulfurization process, so that the dust content in the flue gas can be effectively reduced without arranging a corresponding dust removal device; meanwhile, after the solid particles of the desulfurizing agent are captured by the desulfurizing liquid, the solid particles of the desulfurizing agent can be dissolved in the desulfurizing liquid again, and can be recycled after recovery treatment, thereby being beneficial to energy conservation and emission reduction.
Further, the desulfurizer solution is sprayed into the flue gas pipeline 14 in the form of fog drops, and the particle size of the fog drops is 40-100 μm; therefore, on one hand, after the desulfurizer solution is sprayed into the flue gas pipeline 14, the desulfurizer fog drops are quickly dried into desulfurizer solid particles under the heating and evaporation action of high-temperature flue gas before contacting with the pipe wall of the gas inlet pipeline, and flow to downstream equipment along with the flue gas, so that the material accumulation is favorably prevented after the fog drops contact with the pipe wall of the gas inlet pipeline, on the other hand, the particle size of the fog drops is controlled to be 40-100 mu m, the large specific surface area of the desulfurizer solid particles is favorably ensured, the contact area of the desulfurizer and the flue gas is increased to a certain extent, and the desulfurization efficiency is favorably improved.
Furthermore, the flue gas is discharged in the conventional industrial production process in the fields of coal power, chemical industry and the likeHigh temperature exhaust gases, including at least SO2、SO3(ii) a The temperature of the flue gas is 150-500 ℃. The desulfurizing agent comprises Na2CO3Or Na2SO3(ii) a Wherein, the main reaction equation in the desulfurization process is as follows:
Na2CO3(s)+SO3(g)＝Na2SO4(s)+CO2(g) or is or
Na2SO3(s)+SO3(g)＝Na2SO4(s)+SO2(g)。
Preferably, the desulfurizing agent in the present application is Na2CO3. In addition, because the desulfurizer solid particles are often alkaline substances, the desulfurizer solid particles can also carry out denitration reaction with the nitride of the flue gas and even react with the chloride of the flue gas.
On the basis, the problem of removing SO in the flue gas is solved3In the process, because of the problem that the desulfurizer is not fully dissolved or is supersaturated to cause the blockage of the corresponding pipeline, the application continues to give emphasis to the injection system:
the injection system comprises a dissolving tank 3, a dilute solution tank 6 and a spray gun 13 which are communicated in sequence; a liquid inlet of the dissolving tank 3 is connected with an outlet of the process water pipeline 1 and is used for adding a water solvent, preferably pure water, softened water or deionized water, into the dissolving tank 3; and a feed inlet of the dissolving tank 3 is connected with the desulfurizer powder feeding mechanism 2 and is used for adding desulfurizer powder into the dissolving tank 3. The dissolving tank 3 is provided with a stirrer 31 for improving the dissolving efficiency of the desulfurizer. In the dissolving tank 3, by controlling the adding amount of the desulfurizer and water, the desulfurizer solution is ensured to be in a state close to saturation (namely close to saturation, but not in saturation), and by fully stirring by the stirrer 31, the desulfurizer used in the injection system can be fully dissolved, and the condition that the solid desulfurizer blocks corresponding pipelines can be effectively avoided; further, after the desulfurizing agent is sufficiently dissolved, the desulfurizing agent solution in the dissolving tank 3 is sent to the dilute solution tank 6. The independent setting between dissolving tank 3, the dilute solution jar 6, the desulfurizer solution that treats to use on the one hand carries out individual storage, avoids receiving dissolving tank 3 in the interference of dissolving process, on the other hand in spray gun 13 course of work, can guarantee the supply of desulfurizer solution steadily effectively.
The stirrer 31 is preferably a paddle stirrer, which not only has a simple structure but also can ensure the dissolution efficiency of the desulfurizing agent in water.
The adding amount of the desulfurizer and the water is preferably 5 to 45 percent (mass ratio); wherein, process water pipeline 1 sets up the solenoid valve, dissolving tank 3 has level gauge, controller, the controller is connected with dissolving tank 3's level gauge, process water pipeline 1's solenoid valve, desulfurizer powder input mechanism 2, through the current liquid level condition according to system's predetermined volume of putting ratio and level gauge, can adjust dissolving tank 3's inflow, feed volume automatically to improve dissolving tank 3 feeding process's intelligent degree.
A first pump body 4 is arranged between the dissolving tank 3 and the dilute solution tank 6 and is used for pumping the desulfurizer solution in the dissolving tank 3 into the dilute solution tank 6; specifically, the liquid outlet of the dissolving tank 3 is connected with the inlet of the first pump body 4 through the first material conveying pipe 33, the outlet of the first pump body 4 is connected with the inlet of the dilute solution tank 6 through the second material conveying pipe 5, and valve bodies are arranged in the first material conveying pipe 33 and the second material conveying pipe 5. The dissolving process of the dissolving tank 3 can be a continuous dissolving process or a batch dissolving process. In order to ensure that the desulfurizer in the injection system is fully dissolved, the dissolving tank 3 is preferably an intermittent dissolving process, after all the desulfurizer powder in the dissolving tank 3 is dissolved, the first delivery pipe 33, the valve body in the second delivery pipe 5 and the first pump body 4 are opened, the desulfurizer solution is pumped into the dilute solution tank 6, then the first pump body 4 is at least closed, and then the material is fed into the dissolving tank 3, so that the desulfurizer can enter downstream equipment after being fully dissolved, and the condition that the solid desulfurizer blocks corresponding pipelines is avoided.
The top of the dilute solution tank 6 is provided with a vent pipe 61 for balancing the internal and external air pressure of the tank body, so that the solution in the dilute solution tank 6 can flow out conveniently. The bottom of dissolving tank 3 sets up first drain 32, the bottom of dilute solution jar 6 sets up second drain 62 for it is clean to regularly blowdown to the tank bottoms in dissolving tank 3, the dilute solution jar 6, can effectively avoid other solid-state foreign matters to block the pipeline.
Because the desulfurizer in the application adopts inorganic solute, the dissolution condition of the desulfurizer is greatly influenced by the external temperature, and the solutions in the dissolving tank 3 and the dilute solution tank 6 have certain concentrations, the temperature of the corresponding tank bodies needs to be controlled, so that the desulfurizer is prevented from crystallizing out of the solution to cause the blockage of corresponding pipelines; the heating jacket is established to 3 outer wall covers of dissolving tank, is favorable to improving the dissolution efficiency of desulfurizer on the one hand, and on the other hand can play the effect of preheating, alleviates the heating load of the low reaches jar of body. A heating device is arranged in the dilute solution tank 6 and used for directly heating the desulfurizer solution; the heat preservation device is established to the outer wall cover of dilute solution jar 6 for carry out whole heat preservation to dilute solution jar 6, thereby can ensure the solution temperature in dilute solution jar 6 effectively, prevent that under extreme low temperature environment, the desulfurizer from crystallization out from the solution, cause corresponding pipeline to block up. And a solution temperature detection device is arranged at an outlet of the dilute solution tank 6 and is used for detecting the temperature of the solution flowing out of the desulfurizer solution storage tank.
And a second pump body 7 is arranged between the dilute solution tank 6 and the spray gun 13 and is used for pumping the desulfurizer solution in the dilute solution tank 6 to the spray gun 13. Specifically, the liquid outlet of the dilute solution tank 6 is connected with the inlet of the second pump body 7 through a third delivery pipe 63, the outlet of the second pump body 7 is connected with the liquid inlet of the spray gun 13 through a fourth delivery pipe 8, and valve bodies are arranged in the third delivery pipe 63 and the fourth delivery pipe 8. In addition, set up first filter 9 in the fourth conveying pipeline 8 for filter desulfurizer solution, avoid the solid matter that probably carries in the solution to get into and cause the condition emergence of spray gun 13 jam in spray gun 13, in order to guarantee that spray gun 13 carries out normal spraying work, ensure the normal clear of desulfurization.
The dilute solution tank 6 is provided with a return pipe 10, one end of the return pipe 10 is connected with the dilute solution tank 6, and the other end of the return pipe is communicated with an outlet of the second pump body 7, so that the actual injection flow of the spray gun 13 is controlled, on the basis that the second pump body 7 is in the best operation state, the injection system can adjust the reflux ratio according to the smoke fluctuation condition in the smoke pipeline 14, and the actual injection flow of the spray gun 13 is adapted to the actual smoke flow in the smoke pipeline 14.
In addition, the injection system further comprises a compressed air pipe 11, an outlet of the compressed air pipe 11 is communicated with a gas inlet of the spray gun 13, high-pressure air provided by an external air source enters the spray gun 13 through the compressed air pipe 11, and gas-assisted atomized injection is carried out on the spraying process of the spray gun 13. Similarly, the compressed air pipe 11 is provided with a second filter 12 for filtering air, so as to avoid the occurrence of the situation that solid substances possibly carried in the air enter the spray gun 13 to block the spray gun 13, so as to ensure that the spray gun 13 performs normal spraying operation and desulfurization is performed normally. The pressure detection device is arranged at the inlet of the spray gun 13 and used for detecting the inlet pressure of the spray gun 13 so as to control the injection pressure in the high-pressure spraying process and the injection amount of the desulfurizer solution in unit time.
In the present invention, any desulfurization system can include the SO in the flue gas described in the present embodiment3To emphasize SO-containing in flue gas pipeline3Treating the flue gas; similarly, the flue gas in the present application is not limited to flue gas discharged in the fields of coal power, chemical industry, and the like, and the flue gas pipeline 14 is not limited to flue gas pipelines in the fields of coal power, chemical industry, and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. SO in flue gas3The removing system is characterized by comprising a desulfurization device, an injection system and a flue gas pipeline (14), wherein an outlet of the flue gas pipeline (14) is communicated with an inlet of the desulfurization device, and the injection system is communicated with the flue gas pipeline (14) through a spray gun (13); the injection system comprises a dissolving tank (3) and a dilute solution tank (6) which are communicated in sequenceA spray gun (13); the inlet of dissolving tank (3) and the exit linkage of technology water pipeline (1), the feed inlet and the desulfurizer powder of dissolving tank (3) are put in the mechanism (2) and are connected, set up agitator (31) in dissolving tank (3).
2. SO in flue gas according to claim 13The removing system is characterized in that a heating sleeve is sleeved on the outer wall of the dissolving tank (3).
3. SO in flue gas according to claim 13The removing system is characterized in that a heating device is arranged in the dilute solution tank (6) and is used for directly heating the desulfurizer solution; and the outer wall of the dilute solution tank (6) is sleeved with a heat preservation device for carrying out integral heat preservation on the dilute solution tank (6).
4. SO in flue gas according to claim 13The desorption system is characterized in that a first drain outlet (32) is arranged at the bottom of the dissolving tank (3), and a second drain outlet (62) is arranged at the bottom of the dilute solution tank (6).
5. SO in flue gas according to claim 13The removing system is characterized in that a vent pipe (61) is arranged at the top of the dilute solution tank (6).
6. SO in flue gas according to claim 13The removing system is characterized in that a second pump body (7) is arranged between the dilute solution tank (6) and the spray gun (13), an outlet of the second pump body (7) is connected with a liquid inlet of the spray gun (13) through a fourth conveying pipe (8), and a first filter (9) is arranged in the fourth conveying pipe (8).
7. SO in flue gas according to claim 13The removing system is characterized in that the dilute solution tank (6) is provided with a return pipe (10), one end of the return pipe (10) is connected with the dilute solution tank (6), and the other end of the return pipe is communicated with an outlet of the second pump body (7).
8. SO in flue gas according to claim 13Characterized in that the stirrer (31) is a paddle stirrer.
9. SO in flue gas according to claim 13The stripping system is characterized in that the injection system further comprises a compressed air pipe (11), and an outlet of the compressed air pipe (11) is communicated with a gas inlet of the spray gun (13).
10. SO in flue gas according to claim 93Characterized in that the compressed air pipe (11) is provided with a second filter (12).
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