Desulfurization system for coking flue gas

Abstract

The utility model provides a desulfurization system for coking flue gas, which comprises a fire retardant unit, a primary dust removal unit, a secondary dust removal unit and an exhaust unit which are sequentially communicated along a flue gas flowing direction, the secondary dust removal unit is provided with a dust discharge port and a gas outlet, and the gas outlet is communicated with the exhaust unit; a pipeline between the first-stage dust removal unit and the second-stage dust removal unit is defined as a reaction pipe, a desulfurizer inlet and a desulfurized fly ash inlet are further formed in the reaction pipe, the desulfurization system for the coking flue gas further comprises a desulfurizer supply unit and a desulfurized fly ash utilization unit, the desulfurized fly ash utilization unit is provided with an ash inlet and an ash outlet, and the desulfurizer supply unit is connected with the desulfurized fly ash utilization unit. The ash inlet is communicated with the dust outlet, and the ash outlet is communicated with the desulfurized ash inlet. According to the desulfurization system for coking flue gas provided by the utility model, desulfurized fly ash containing a large amount of unreacted desulfurizer is led out from the secondary dust remover and is introduced into the reaction tube again from the desulfurized fly ash inlet, so that the utilization rate of the desulfurized fly ash is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas desulfurization, and in particular relates to a desulfurization system for coking flue gas. Background Art

[0002] Flue gas desulfurization in coking plants has become a key area of ​​governance, but the flue gas in coking plants has characteristics such as large changes in sulfur dioxide concentration, high nitrogen oxide concentration, high flue gas temperature and large fluctuations (120-230℃), and high moisture content, which makes it difficult to desulfurize coking flue gas. Calcium-based dry desulfurization uses dry desulfurizers to convert sulfur dioxide in flue gas into calcium sulfate, and fixes calcium sulfate through filtration and separation processes to achieve flue gas desulfurization. It is widely used in coking flue gas desulfurization.

[0003] However, when calcium-based dry desulfurization is used, the coking flue gas is affected by the process, which results in a high sulfur dioxide content in a specific time period of each production cycle and a lower sulfur dioxide content in the rest of the time period. In order to achieve the specified desulfurization efficiency, the amount of calcium-based desulfurizer used is generally increased, resulting in a large amount of unreacted high-efficiency calcium-based desulfurizer in the desulfurization by-product (coke powder), resulting in a waste of desulfurizer and increased usage and economic costs. Utility Model Content

[0004] The embodiment of the utility model provides a desulfurization system for coking flue gas, aiming to solve the technical problem in the prior art that the volatility of sulfur dioxide leads to waste of desulfurization agent and affects the cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a desulfurization system for coking flue gas, comprising a fire arresting unit, a primary dust removal unit, a secondary dust removal unit and an exhaust unit which are sequentially connected along the flow direction of the flue gas, wherein the secondary dust removal unit has a dust exhaust port and an air outlet, and the air outlet is connected to the exhaust unit;

[0006] The pipeline between the primary dust removal unit and the secondary dust removal unit is defined as a reaction tube, and a desulfurization agent inlet and a desulfurization ash inlet are also provided on the reaction tube. The desulfurization system for coking flue gas also includes a desulfurization agent supply unit and a desulfurization ash utilization unit. The outlet end of the desulfurization agent supply unit is connected to the desulfurization agent inlet. The desulfurization ash utilization unit has an ash inlet and an ash outlet. The ash inlet is connected to the dust exhaust port, and the ash outlet is connected to the desulfurization ash inlet.

[0007] In a possible implementation, the coking flue gas desulfurization system also includes a coke powder recovery unit, which includes a second silo pump, a first silo pump and a coke powder silo connected in sequence along the coke powder transportation direction, the feed port of the second silo pump is connected to the primary dust removal unit, the feed port of the first silo pump is connected to the fire arresting unit, the discharge port of the second silo pump is connected to the first silo pump, and the discharge port of the first silo pump is connected to the coke powder silo; the second silo pump also has a first compressed air inlet.

[0008] In one possible implementation, the fire arrester unit includes a low-temperature flame arrester having a flue gas inlet, an air inlet, a coke powder outlet and a flue gas outlet. A mixing valve is provided at the air inlet, the coke powder outlet is connected to the first bin pump, and the flue gas outlet is connected to the feed port of the primary dust removal unit.

[0009] In a possible implementation, the desulfurizer supply unit includes a powder bin, a first frequency converter, a first compensator, and a first injector connected in series along the desulfurizer powder conveying direction, and also includes a powder supply vehicle and a first fan, and the powder outlet of the first injector is connected to the desulfurizer inlet;

[0010] The discharge port of the powder supply vehicle is communicated with the powder bin, and the air outlet of the first fan is communicated with the air inlet of the first injector, so as to replenish the desulfurizer powder in the powder bin into the reaction tube.

[0011] In a possible implementation, a gate valve is provided between the powder bin and the first frequency converter.

[0012] In a possible implementation, the desulfurization ash utilization unit includes an ash bin, a second frequency converter, a second compensator, and a second injector connected in series along the conveying direction of the desulfurization agent ash, the ash bin is provided with the ash inlet, and the second injector is provided with the ash outlet;

[0013] The desulfurization ash utilization unit further includes a second fan, an air outlet of the second fan is connected to an air inlet of the second injector, so as to replenish the desulfurization ash in the ash bin into the reaction tube.

[0014] In a possible implementation, the ash bin is further provided with a slag discharge port.

[0015] In a possible implementation, the desulfurization ash utilization unit further includes a third silo pump, which is disposed on a pipeline between the ash inlet and the dust outlet, and a second compressed air inlet is provided on the third silo pump.

[0016] In a possible implementation, a reaction amplifier is provided on the reaction tube.

[0017] In a possible implementation, the exhaust unit includes an induced draft fan and an exhaust chimney, the induced draft fan is disposed at an air inlet of the exhaust chimney, and the air inlet is communicated with the air outlet.

[0018] Compared with the prior art, the desulfurization system for coking flue gas provided by the utility model adds a desulfurization ash utilization unit, which draws out the desulfurization ash containing a large amount of unreacted desulfurizer from the secondary dust collector and reintroduces it into the reaction tube from the desulfurization ash inlet, so that the desulfurizer in the desulfurization ash can re-participate in the reaction, thereby improving the utilization rate of the desulfurization ash and saving the use cost; according to the volatility of sulfur dioxide, only the desulfurization ash utilization unit is used to provide the desulfurizer during the period when the sulfur dioxide content is low, and when the sulfur dioxide content is high, the desulfurization ash utilization unit and the desulfurizer supply unit are used to jointly provide the desulfurizer, thereby reducing the energy consumption of the system and saving the energy use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a desulfurization system for coking flue gas provided by an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure and assembly of a desulfurization system for coking flue gas provided by an embodiment of the utility model;

[0022] Figure 3 for Figure 2 A partial enlarged view of the desulfurizing agent supply unit used in the invention;

[0023] Figure 4 for Figure 2 An enlarged schematic diagram of the assembly of the desulfurization ash utilization unit and the secondary dust removal unit used in the embodiment.

[0024] Description of reference numerals:

[0025] 1. Fire arrester unit; 11. Low temperature flame arrester; 12. Air mixing valve;

[0026] 2. Primary dust removal unit;

[0027] 3. Secondary dust removal unit;

[0028] 4. Exhaust unit; 41. induced draft fan; 42. exhaust chimney;

[0029] 5. Desulfurization ash utilization unit; 51. Ash bin; 511. Slag discharge port; 52. Second frequency converter; 53. Second compensator; 54. Second ejector; 55. Second fan; 56. Third bin pump;

[0030] 6. Coke powder recovery unit; 61. First bin pump; 62. Second bin pump; 63. Coke powder bin;

[0031] 7. Desulfurizing agent supply unit; 71. Powder bin; 72. First frequency converter; 73. First compensator; 74. First injector; 75. First fan; 76. Powder supply vehicle; 77. Gate valve;

[0032] 8. Reaction amplifier;

[0033] 9. Reaction tube. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0038] Please also read Figures 1 to 4 , the desulfurization system for coking flue gas provided by the utility model is now described. The desulfurization system for coking flue gas includes a fire arresting unit 1, a primary dust removal unit 2, a secondary dust removal unit 3 and an exhaust unit 4 which are sequentially connected along the flue gas flow direction, the secondary dust removal unit 3 has a dust exhaust port and an air outlet, and the air outlet is connected to the exhaust unit 4; the pipeline between the primary dust removal unit 2 and the secondary dust removal unit 3 is defined as a reaction tube 9, and a desulfurizer inlet and a desulfurization ash inlet are also provided on the reaction tube 9, the desulfurization system for coking flue gas also includes a desulfurizer supply unit 7 and a desulfurization ash utilization unit 5, the outlet end of the desulfurizer supply unit 7 is connected to the desulfurizer inlet, the desulfurization ash utilization unit 5 has an ash inlet and an ash outlet, the ash inlet is connected to the dust exhaust port, and the ash outlet is connected to the desulfurization ash inlet.

[0039] It should be noted that both the first dust removal unit 2 and the secondary dust removal unit 3 can be equipped with bag dust collectors.

[0040] It should be noted that Figure 1 The arrow direction in the figure refers to the moving direction of the coking flue gas; Figure 3 The direction of the arrow in the figure refers to the transport direction of the desulfurizer; Figure 4 The direction of the arrow refers to the transportation direction of desulfurization ash.

[0041] As an embodiment of selecting a desulfurizer, either the desulfurization ash inlet or the desulfurizer inlet is opened selectively. When the sulfur dioxide content is high, the desulfurizer inlet is opened to add the desulfurizer, and the desulfurization ash inlet is closed. When the sulfur dioxide content is low, the desulfurization ash inlet is opened, and the desulfurization ash with unreacted desulfurizer is reintroduced into the reaction tube, and the desulfurizer inlet is closed. The unreacted desulfurizer contained in the desulfurization ash meets the reaction dosage requirement for sulfur dioxide.

[0042] As another embodiment of the desulfurization agent selection, the desulfurization ash inlet and the desulfurization agent inlet are opened at the same time.

[0043] Compared with the prior art, the desulfurization system for coking flue gas provided in the present embodiment adds a desulfurization ash utilization unit 5, which draws out the desulfurization ash containing a large amount of unreacted desulfurizer from the secondary dust collector and reintroduces it into the reaction tube 9 from the desulfurization ash inlet, so that the desulfurizer in the desulfurization ash can re-participate in the reaction, thereby improving the utilization rate of the desulfurization ash and saving the use cost; according to the volatility of sulfur dioxide, only the desulfurization ash utilization unit 5 is used to provide the desulfurizer during the period of low sulfur dioxide content, and when the sulfur dioxide content is high, the desulfurization ash utilization unit 5 and the desulfurizer supply unit 7 are used to jointly provide the desulfurizer, thereby reducing the energy consumption of the system and saving the energy use cost.

[0044] In some embodiments, see Figure 1 and Figure 2 The desulfurization system for coking flue gas also includes a coke powder recovery unit 6, which includes a second bin pump 62, a first bin pump 61 and a coke powder bin 63 connected in sequence along the coke powder transportation direction, a feed port of the second bin pump 62 is connected to the primary dust removal unit 2, a feed port of the first bin pump 61 is connected to the flame arresting unit 1, a discharge port of the second bin pump 62 is connected to the first bin pump 61, and a discharge port of the first bin pump 61 is connected to the coke powder bin 63; the second bin pump 62 also has a first compressed air inlet.

[0045] The coke powder recovery unit 6 provided in this embodiment can recover coke powder. The coke powder in the coking flue gas is initially removed in the fire arresting unit 1, and enters the coke powder bin 62 through the first bin pump 61. The flue gas after the initial removal enters the primary dust removal unit 2. Most of the coke powder is removed by the primary dust removal unit 2, collected by the second bin pump 62 and moved to the coke powder bin 63. The recovered coke powder can be put into steel smelting or sold, which improves the utilization rate of resources. Compressed air is introduced from the first compressed air inlet to assist the transportation of coke powder and improve the transportation efficiency.

[0046] In some embodiments, see Figure 1 and Figure 2 The fire arrester unit 1 includes a low-temperature flame arrester 11, which has a flue gas inlet, an air inlet, a coke powder outlet and a flue gas outlet. A mixing valve 12 is arranged at the air inlet. The coke powder outlet is connected to the first bin pump, and the flue gas outlet is connected to the feed port of the primary dust removal unit 2. The low-temperature flame arrester 11 can adjust the mixing valve 12 according to the flue gas volume and working conditions of the coking flue gas, so as to extinguish and cool the high-temperature coke powder and flue gas with sparks in the low-temperature flame arrester 11, thereby ensuring the safety of coking flue gas treatment.

[0047] In some embodiments, see Figure 1 and Figure 2The desulfurizer supply unit 7 includes a powder bin 71, a first frequency converter 72, a first compensator 73 and a first injector 74 which are connected in series along the conveying direction of the desulfurizer powder, and also includes a powder supply cart 76 and a first fan 75. The powder outlet of the first injector 74 is connected to the desulfurizer inlet; the discharge port of the powder supply cart 76 is connected to the powder bin 71, and the air outlet of the first fan 75 is connected to the air inlet of the first injector 74, so as to replenish the desulfurizer powder in the powder bin 71 into the reaction tube 9.

[0048] In specific implementation, the lower part of the powder bin 71 is a conical funnel to facilitate the feeding of the desulfurizer. A bin top dust collector and a vacuum pressure release valve are arranged on the top of the powder bin 71 to store the desulfurizer.

[0049] In specific implementation, the first frequency converter 72 is a star-shaped air lock, the first ejector 74 is a venturi-type gas-solid ejector, and the first blower 75 is a roots blower.

[0050] In this embodiment, the desulfurizer falls into the reaction tube 9 through the powder bin 71, mixes with the coking flue gas, and reacts with the sulfur dioxide therein to generate calcium sulfate, thereby achieving desulfurization treatment. The first frequency converter can control the feeding speed of the desulfurizer, thereby reasonably using the desulfurizer resources to avoid waste caused by excessive desulfurizer; the first compensator 73 can reduce the vibration generated when the first frequency converter 72 is running, and withstand the negative pressure generated by the first ejector 74; the first ejector 74 is connected to the first fan 75, and the first fan 75 generates high-pressure air to pass into the first ejector 74, and drives the desulfurizer powder falling into the first ejector 74 into the reaction tube 9, thereby mixing the desulfurizer and the coking gas. The first frequency converter 72 and the first compensator 73 can improve the stability and safety of the desulfurizer feeding; the powder supply vehicle 76 can replenish the desulfurizer to avoid the supply of the desulfurizer being lower than the demand. The first fan 75 can blow the desulfurizer into the reaction tube 9 for reaction, thereby ensuring the smooth progress of the desulfurization reaction.

[0051] In some embodiments, see Figure 3 A gate valve 77 is provided between the powder bin 71 and the first frequency converter 72. The gate valve 77 can control the switch state of the feed port of the powder bin 71 to control whether the powder bin 71 is working or not, so that the desulfurizing agent supply unit 7 can be used according to the working conditions.

[0052] In some embodiments, see Figure 1 and Figure 2 The desulfurization ash utilization unit 5 includes an ash bin 51, a second frequency converter 52, a second compensator 53 and a second injector 54 which are connected in series in sequence along the desulfurizer ash conveying direction. An ash inlet is formed on the ash bin 51, and an ash outlet is provided on the second injector 54. The desulfurization ash utilization unit 5 also includes a second fan 55, and the air outlet of the second fan 55 is connected to the air inlet of the second injector 54 to replenish the desulfurization ash in the ash bin 51 into the reaction tube 9.

[0053] In specific implementation, the second frequency converter 52 is a star-shaped air lock, the second ejector 54 is a venturi-type gas-solid ejector, and the second blower 55 is a roots blower.

[0054] In this embodiment, the desulfurization ash with unreacted desulfurizer falls into the reaction tube 9 through the ash bin 51 and mixes with the coking flue gas. The unreacted desulfurizer reacts with the sulfur dioxide therein to generate calcium sulfate, thereby achieving desulfurization treatment. The second frequency converter 52 can control the feeding speed of the desulfurization ash, thereby reasonably using the desulfurization ash resources and avoiding waste caused by excessive desulfurizer; the second compensator 53 can reduce the vibration generated when the second frequency converter 52 is running, and withstand the negative pressure generated by the second injector 54; the second injector 54 is connected to the second fan 55, and the second fan 55 generates high-pressure air to pass into the second injector 54, and drives the desulfurizer falling into the second injector 54 into the reaction tube 9, thereby mixing the desulfurization ash and the coking gas. The second frequency converter 54 and the second compensator 53 can improve the stability and safety of the desulfurization ash feeding; the second fan 55 can blow the desulfurization ash into the reaction tube 9 for reaction, thereby improving the utilization rate of the desulfurizer. The ash bin 51 is connected to the dust outlet of the secondary dust removal unit 3, and the desulfurization ash with unreacted desulfurization agent is moved into the ash bin 51, and then enters the reaction tube 9 from the ash bin 51 through the desulfurization ash inlet, so that the desulfurization agent can be reused and the use cost is saved.

[0055] In some embodiments, the first frequency converter 72 is provided with a compressed air inlet and an outlet, and the outlet is connected to the discharge port of the powder bin 71. The negative pressure generated by the operation of the first fan 75 will be offset in the first frequency converter 72 to prevent the negative pressure from entering the powder bin 71 along the desulfurization agent transportation channel and causing danger. The outlet is connected to the powder bin 71, and the excess compressed air can be used to fluidize the desulfurization agent to speed up the discharge efficiency of the desulfurization agent.

[0056] In some embodiments, see Figure 4 The ash bin 51 is also provided with a slag discharge port 511. After the desulfurized ash is re-reacted, the content of the unreacted desulfurizer is greatly reduced, and the slag discharge port 511 can discharge such desulfurized ash for subsequent treatment.

[0057] In some embodiments, see Figure 4 The desulfurization ash utilization unit 5 further includes a third bin pump 56, which is arranged on the pipeline between the ash inlet and the dust outlet, and a second compressed air inlet is provided on the third bin pump 56. The third bin pump 56 can collect the desulfurization ash collected by the secondary dust removal unit 3, and introduce high-pressure air from the second compressed air inlet to pump the desulfurization ash into the ash bin 51, so as to realize the reuse of the desulfurizer that is not completely consumed in the desulfurization ash, reduce the waste rate, and save the cost of the desulfurizer.

[0058] In some embodiments, see Figure 2 and Figure 4 A reaction enhancer 8 is provided on the reaction tube 9. The reaction enhancer 8 can increase the disturbance of the desulfurizer in the coking flue gas, increase the mixing degree, and improve the desulfurization efficiency.

[0059] In specific implementation, the reaction enhancer 8 is a cyclone reactor having blades rotating along its own long axis. The blades rotate to stir the coking flue gas and the desulfurizer, so that the flue gas forms a cyclone, thereby improving the desulfurization efficiency.

[0060] In some embodiments, see Figure 2 The exhaust unit 4 includes an induced draft fan 41 and an exhaust chimney 42. The induced draft fan 41 is arranged at the air inlet of the exhaust chimney 42, and the air inlet is connected to the air outlet. The induced draft fan 41 can guide the flow of smoke, and the exhaust chimney 42 can discharge the treated smoke.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A desulfurization system for coking flue gas, characterized in that: It includes a fire-blocking unit, a primary dust removal unit, a secondary dust removal unit and an exhaust unit which are sequentially connected along the flow direction of smoke, wherein the secondary dust removal unit has a dust exhaust port and an air outlet, and the air outlet is connected to the exhaust unit; The pipeline between the primary dust removal unit and the secondary dust removal unit is defined as a reaction tube, and a desulfurization agent inlet and a desulfurization ash inlet are also provided on the reaction tube. The desulfurization system for coking flue gas also includes a desulfurization agent supply unit and a desulfurization ash utilization unit. The outlet end of the desulfurization agent supply unit is connected to the desulfurization agent inlet. The desulfurization ash utilization unit has an ash inlet and an ash outlet. The ash inlet is connected to the dust exhaust port, and the ash outlet is connected to the desulfurization ash inlet.

2. The desulfurization system for coking flue gas according to claim 1, characterized in that: The desulfurization system for coking flue gas also includes a coke powder recovery unit, which includes a second silo pump, a first silo pump and a coke powder silo connected in sequence along the coke powder transportation direction, the feed port of the second silo pump is connected to the primary dust removal unit, the feed port of the first silo pump is connected to the fire arresting unit, the discharge port of the second silo pump is connected to the first silo pump, and the discharge port of the first silo pump is connected to the coke powder silo; the second silo pump also has a first compressed air inlet.

3. The desulfurization system for coking flue gas according to claim 2, characterized in that: The fire arrester unit includes a low-temperature flame arrester, which has a flue gas inlet, an air inlet, a coke powder outlet and a flue gas outlet. A mixing valve is provided at the air inlet, the coke powder outlet is connected to the first bin pump, and the flue gas outlet is connected to the feed port of the primary dust removal unit.

4. The desulfurization system for coking flue gas according to claim 1, characterized in that: The desulfurizer supply unit includes a powder bin, a first frequency converter, a first compensator and a first injector connected in series along the desulfurizer powder conveying direction, and also includes a powder supply vehicle and a first fan, and the powder outlet of the first injector is connected to the desulfurizer inlet; The discharge port of the powder supply vehicle is communicated with the powder bin, and the air outlet of the first fan is communicated with the air inlet of the first injector, so as to replenish the desulfurizer powder in the powder bin into the reaction tube.

5. The desulfurization system for coking flue gas according to claim 4, characterized in that: A gate valve is provided between the powder bin and the first frequency converter.

6. The desulfurization system for coking flue gas according to claim 1, characterized in that: The desulfurization ash utilization unit comprises an ash bin, a second frequency converter, a second compensator and a second injector which are connected in series in the direction of conveying the desulfurization agent ash. The ash bin is provided with the ash inlet, and the second injector is provided with the ash outlet. The desulfurization ash utilization unit further includes a second fan, an air outlet of the second fan is connected to an air inlet of the second injector, so as to replenish the desulfurization ash in the ash bin into the reaction tube.

7. The desulfurization system for coking flue gas according to claim 6, characterized in that: The ash bin is also provided with a slag discharge port.

8. The desulfurization system for coking flue gas according to claim 6, characterized in that: The desulfurization ash utilization unit also includes a third bin pump, which is arranged on the pipeline between the ash inlet and the dust outlet, and a second compressed air inlet is opened on the third bin pump.

9. The desulfurization system for coking flue gas according to claim 1, characterized in that: The reaction tube is provided with a reaction enhancer.

10. The desulfurization system for coking flue gas according to claim 1, characterized in that: The exhaust unit comprises an induced draft fan and an exhaust chimney. The induced draft fan is arranged at an air inlet of the exhaust chimney, and the air inlet is communicated with the air outlet.

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