A flue gas desulfurization device

Abstract

The utility model relates to a kind of flue gas desulfurization device, belong to environmental protection equipment technical field.Device includes grinder, feeder, bunker, powder feeding system, powder gas heater, sulfur-containing flue gas pipeline, dust catcher, booster fan and chimney, wherein, bunker is connected with feeder, feeder, grinder, powder feeding system and powder gas heater are sequentially connected, powder gas heater output end is connected with sulfur-containing flue gas pipeline, sulfur-containing flue gas pipeline output end is connected with dust catcher, dust catcher is connected with chimney by booster fan.The utility model is preheated before sodium bicarbonate micro powder enters low-temperature sulfur-containing flue gas pipeline, so that the temperature of sodium bicarbonate micro powder exceeds 140 ℃, body surface form changes from powder to fluffy popcorn, to increase the surface area of sodium bicarbonate powder particle, then, heated sodium bicarbonate powder is sprayed into sulfur-containing flue gas pipeline, so that heated sodium bicarbonate powder and flue gas sulfur dioxide occur rapid chemical reaction.

Description

Technical Field

[0001] This utility model relates to a flue gas desulfurization device, belonging to the field of environmental protection equipment technology. Background Technology

[0002] like Figure 1 As shown, SDS sodium-based dry desulfurization is a commonly used flue gas desulfurization method. The desulfurizing agent (NaHCO3, also known as baking soda) is ground into ultrafine powder (above 800 mesh) by a grinder. Then, a fan, with the help of natural wind, blows the ultrafine powder into the sulfur-containing flue gas pipeline through the powder conveying duct. It mixes and contacts the sulfur-containing flue gas thoroughly, causing the ultrafine baking soda powder to undergo a rapid chemical reaction with SO2 in the sulfur-containing flue gas, producing the byproduct Na2SO4. The byproduct Na2SO4 is recovered and reused by a bag filter. The flue gas dust is captured and collected by the dust collector and transported for other uses. Finally, the flue gas is purified by the dust collector and discharged into the atmosphere after meeting the standards.

[0003] In the above production process, ultrafine sodium bicarbonate powder (NaHCO3) is used as a desulfurizing agent. It is activated by the high temperature of the flue gas in the high-temperature sulfur-containing flue gas pipeline, and a microporous structure is formed on the surface of its particles. When the flue gas temperature reaches above 140°C, the sodium bicarbonate powder changes from powder to fluffy popcorn-like shape. Its surface area increases rapidly and significantly, and its reaction activity is greatly improved, thereby greatly increasing the chemical reaction rate of sulfur-containing flue gas desulfurization.

[0004] Main reaction:

[0005] 2NaHCO3→ Na2CO3+ H2O + CO2

[0006] SO2+ Na2CO3+ 1 / 2O2→ Na2SO4+ CO2

[0007] Side reactions:

[0008] SO3 + Na2CO3 → Na2SO4 + CO2

[0009] The aforementioned production process is only suitable for high-temperature flue gas above 140℃. However, for low-temperature flue gas (such as flue gas after waste heat recovery and flue gas escaping from production), the above flue gas desulfurization process cannot meet the desulfurization standards. Therefore, the desulfurization production process for low-temperature flue gas has always been a technological gap in the current environmental protection industry. With the continuous improvement of national industrial flue gas emission standards, many industrial production lines have had to shut down or switch to other production lines due to the inability to achieve desulfurization standards for low-temperature flue gas, causing huge economic losses to manufacturers. Therefore, this utility model is proposed. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a flue gas desulfurization device. Before sodium bicarbonate powder (desulfurizing agent) enters the low-temperature sulfur-containing flue gas pipeline (below 140°C), the sodium bicarbonate powder undergoes preheating treatment outside the low-temperature sulfur-containing flue gas pipeline. This preheats the sodium bicarbonate powder to a temperature exceeding 140°C, changing its surface morphology from powder to a fluffy popcorn-like shape, thereby increasing the surface area of ​​the sodium bicarbonate powder particles. Then, the heated sodium bicarbonate powder is sprayed into the low-temperature sulfur-containing flue gas pipeline, allowing the heated sodium bicarbonate powder to undergo a rapid chemical reaction with the sulfur dioxide in the flue gas. Furthermore, to further improve the overall desulfurization efficiency of the flue gas, this invention also upgrades and modifies the relevant equipment or processes involved in flue gas desulfurization production.

[0011] The technical solution of this utility model is as follows:

[0012] A flue gas desulfurization device includes a grinder, a feeder, a silo, a powder feeding system, a powder-gas heater, a sulfur-containing flue gas duct, a dust collector, a booster fan, and a chimney, wherein:

[0013] The silo is connected to a feeder, and the feeder, grinding mill, powder feeding system and powder gas heater are connected in sequence. The output end of the powder gas heater is connected to a sulfur-containing flue gas pipeline, and the output end of the sulfur-containing flue gas pipeline is connected to a dust collector. The dust collector is connected to a chimney through a booster fan.

[0014] The pulverized gas heater includes an insulated box, a heat storage rod, a gas pipeline, a gas nozzle, and a pulverized gas supply pipe. The heat storage rod is fixedly installed inside the insulated box, and the pulverized gas supply pipe is spirally wound on the heat storage rod. The input end of the pulverized gas supply pipe is connected to a pulverized gas supply system, and the output end is connected to a sulfur-containing flue gas pipeline through a pulverized gas injector. Several gas nozzles are installed inside the insulated box below the pulverized gas supply pipe, and the gas nozzles are connected to gas pipelines.

[0015] According to a preferred embodiment of this utility model, a solenoid valve is installed on the gas pipeline, and a temperature sensor is installed at the output end of the powder conveying and air supply pipe. Both the temperature sensor and the solenoid valve are connected to a PLC control system. The PLC control system is used to control the on / off of the gas, the amount of gas supplied, and to detect the temperature of the output sodium bicarbonate powder.

[0016] According to a preferred embodiment of this utility model, a heat exchanger is installed inside the sulfur-containing flue gas pipeline. One end of the heat exchanger is connected to air, and the other end is connected to a pulverized coal conveying system. The heat exchanger is used to preheat the air supplied by the pulverized coal conveying system. This device allows the supplied air to capture a large amount of heat from the high-temperature flue gas, thereby increasing the temperature of the supplied air itself. This saves energy for the subsequent pulverized coal heater to heat the air supply and improves the heating efficiency of the air supply.

[0017] According to a further preferred embodiment of this utility model, the heat exchanger includes a shell, an inlet pipe, an outlet pipe, and a heating pipe. The inlet pipe is bent multiple times, that is, the inlet pipe bends and coils back and forth in the plane multiple times to increase the heating area. One end of the inlet pipe is sealed. The outlet pipe has the same shape as the inlet pipe and is arranged parallel to the inlet pipe. Multiple heating pipes are arranged between the outlet pipe and the inlet pipe to connect the two. The outlet pipe and the inlet pipe are fixed inside the shell. The shell is set inside the sulfur-containing flue gas pipeline. The shell is open at both ends to ensure that the heating pipes are completely immersed in the flowing high-temperature sulfur-containing flue gas. The air inside the heating pipes is heated by the high-temperature flue gas inside the sulfur-containing flue gas pipeline. The open end of the inlet pipe is set outside the sulfur-containing flue gas pipeline. The inlet pipe passes through the shell and the sulfur-containing flue gas pipeline from the inside to the outside. The open end of the outlet pipe passes through the shell and the sulfur-containing flue gas pipeline from the inside to the outside and is connected to the powder feeding system.

[0018] According to a preferred embodiment of the present invention, the powder feeding system includes a powder feeding fan and a powder feeding pipe. The air inlet of the powder feeding fan is connected to a heat exchanger via an air pipe, and the output end of the powder feeding fan is connected to the powder feeding pipe. The powder feeding pipe is a Venturi pipe, which includes a gas-material mixing section, a convergence section, a throat, and a diffusion section connected in sequence. The gas-material mixing section is connected to the output end of the powder feeding fan and a grinder. The diffusion section is connected to a powder-gas heater via a pipe, and an airflow mixer is provided at the connection between the throat and the diffusion section.

[0019] According to a further preferred embodiment of the present invention, the airflow mixer includes a rotating shaft, blades, and a support. The support is welded from three steel square tubes and is in the shape of a herringbone. The support is fixedly installed on the inner wall of the throat tube. A rotating shaft is provided in the middle of the support, and blades are mounted on the rotating shaft through bearings. The blades are rotated by wind power to improve the mixing uniformity of sodium bicarbonate in the powder conveying air supply, thereby improving the chemical reaction efficiency between the powder conveying air supply and the sulfur-containing flue gas.

[0020] According to a preferred embodiment of this utility model, the powder gas injector includes four hot powder gas branch pipes. One end of each hot powder gas branch pipe is fixedly connected to and communicates with the end of a powder conveying and air supply pipe located at the center of the inner cavity of a sulfur-containing flue gas pipeline. The other end of each hot powder gas branch pipe is welded and fixed to the inner wall of the sulfur-containing flue gas pipeline via a metal rod. The four hot powder gas branch pipes are arranged in a cross shape, and each hot powder gas branch pipe is equipped with several powder gas nozzles. The powder gas nozzles are evenly spaced, and the orientation of the powder gas nozzles is the same as the flow direction of the flue gas in the sulfur-containing flue gas pipeline, thereby reducing the blowing pressure of the sulfur-containing flue gas on the powder gas nozzles.

[0021] According to a preferred embodiment of this utility model, the insulated box is provided with an air inlet and a smoke exhaust outlet.

[0022] According to a preferred embodiment of the present invention, the powder nozzle on the powder injector is a Venturi nozzle.

[0023] The operating method of the above-mentioned flue gas desulfurization device is as follows:

[0024] (1) Place desulfurizing agent in the silo, open the solenoid valve, ignite the gas nozzle, heat the heat storage rod, and use the heat storage rod to heat the powder conveying and air supply pipe. This can ensure both heating efficiency and heating uniformity.

[0025] (2) When the work begins, the desulfurizing agent enters the grinding mill through the feeder. After being ground by the grinding mill, the desulfurizing agent is ground into powder. Then, the powder blowing fan uses the natural air heated by the heat exchanger to blow the ultrafine powder of the desulfurizing agent into the powder conveying air pipe.

[0026] (3) When the desulfurizing agent ultrafine powder flows through the powder conveying and air supply pipe, it is heated by the heat storage rod. The temperature inside the powder conveying and air supply pipe reaches more than 140°, which makes the desulfurizing agent ultrafine powder into fluffy popcorn. Then it enters the sulfur-containing flue gas pipeline and reacts chemically with SO2 in the sulfur-containing flue gas to produce by-product Na2SO4. The by-product Na2SO4 is recycled and reused by the dust collector. The flue gas dust is captured and collected by the dust collector. After the flue gas is purified by the dust collector and meets the standards, it is discharged into the atmosphere through the chimney.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. Before sodium bicarbonate micro powder (desulfurizing agent) enters the low-temperature sulfur-containing flue gas pipeline (below 140°C), the sodium bicarbonate micro powder undergoes a preheating treatment outside the low-temperature sulfur-containing flue gas pipeline, so that the temperature of the sodium bicarbonate micro powder exceeds 140°C, and the surface morphology of the sodium bicarbonate micro powder changes from powder to fluffy popcorn, thereby increasing the surface area of ​​the sodium bicarbonate powder particles. Then, the heated sodium bicarbonate powder is sprayed into the low-temperature sulfur-containing flue gas pipeline, so that the heated sodium bicarbonate powder reacts rapidly with the sulfur dioxide in the flue gas.

[0029] 2. This utility model adds a heat exchanger inside the sulfur-containing flue gas pipeline to preheat the air supplied to the powder conveying system. This device allows the supplied air to capture a large amount of heat from the high-temperature flue gas, thereby increasing the temperature of the supplied air itself. This saves energy for the subsequent powder gas heater to heat the powder conveying air and improves the heating efficiency of the powder conveying air.

[0030] 3. This utility model adds an airflow mixer to the powder conveying system, which uses wind power to drive the blades to rotate, thereby improving the mixing uniformity of sodium bicarbonate in the powder conveying and air supply, and thus improving the chemical reaction efficiency between the powder conveying and air supply and the sulfur-containing flue gas.

[0031] 4. The ultrafine powder desulfurizer gas flow heated by the powder gas heater of this utility model is injected into the sulfur-containing flue gas pipeline through the powder gas nozzle, which improves the mixing efficiency of the ultrafine powder desulfurizer gas flow and the sulfur-containing flue gas. Attached Figure Description

[0032] Figure 1A schematic diagram of an existing flue gas desulfurization (FGD) system.

[0033] Figure 2 This is a schematic diagram of the structure of this utility model;

[0034] Figure 3 This is a schematic diagram of the powder feeding system of this utility model;

[0035] Figure 4 This is a schematic diagram of the airflow mixer structure of this utility model;

[0036] Figure 5 This is a schematic diagram of the powder gas heater structure of this utility model;

[0037] Figure 6 This is a schematic diagram of the heat exchanger structure of this utility model;

[0038] Figure 7 This is a schematic diagram of the powder jet injector from the leeward side of the present invention.

[0039] Figure 8 This is a side view of the powder-air injector of this utility model.

[0040] The components include: 1. Grinding mill; 2. Feeder; 3. Silo; 4. Powder feeding system; 5. Powder gas heater; 6. Sulfur-containing flue gas duct; 7. Dust collector; 8. Booster fan; 9. Chimney; 10. Powder gas injector; 11. Heat exchanger;

[0041] 41. Powder feeding fan; 42. Powder feeding pipe; 43. Airflow mixer;

[0042] 421. Gas-fuel mixing section; 422. Converging section; 423. Throat; 424. Diffusion section;

[0043] 431. Shaft; 432. Blade; 433. Support;

[0044] 51. Insulated box; 52. Heat storage rod; 53. Gas pipeline; 54. Gas nozzle; 55. Powder conveying and air supply duct; 56. Solenoid valve; 57. Temperature sensor; 58. PLC control system; 59. Air inlet; 510. Smoke exhaust outlet;

[0045] 101. Hot powder gas branch pipe; 102. Powder gas nozzle;

[0046] 111. Shell; 112. Air inlet pipe; 113. Air outlet pipe; 114. Heating pipe. Detailed Implementation

[0047] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0048] Example 1:

[0049] like Figure 2-8 As shown, this embodiment provides a flue gas desulfurization device, including a grinding mill 1, a feeder 2, a silo 3, a powder feeding system 4, a powder-gas heater 5, a sulfur-containing flue gas pipeline 6, a dust collector 7, a booster fan 8, and a chimney 9, wherein:

[0050] The silo 3 is connected to the feeder 2. The feeder 2, the grinder 1, the powder feeding system 4 and the powder gas heater 5 are connected in sequence. The output end of the powder gas heater 5 is connected to the sulfur-containing flue gas pipeline 6. The output end of the sulfur-containing flue gas pipeline 6 is connected to the dust collector 7. The dust collector 7 is connected to the chimney 9 through the booster fan 8.

[0051] The powder gas heater 5 includes an insulated box 51, a heat storage rod 52, a gas pipeline 53, a gas nozzle 54, and a powder conveying and air supply pipe 55. The heat storage rod 52 is fixedly installed inside the insulated box 51. The powder conveying and air supply pipe 55 is spirally wound on the heat storage rod 52. The input end of the powder conveying and air supply pipe 55 is connected to the powder delivery system 4, and the output end is connected to the sulfur-containing flue gas pipeline 6 through the powder gas injector 10. Several gas nozzles 54 are installed inside the insulated box 51 below the powder conveying and air supply pipe 55. The gas nozzles 54 have their own ignition function and are connected to the gas pipeline 53.

[0052] The heat storage rod 52 is cylindrical and made of refractory ceramic material. It has a heat storage function and plays an important role in regulating and maintaining the internal heating environment temperature of the powder gas heater 5. The outer shell of the insulation box 51 is composed of refractory ceramic material and an outer insulation layer.

[0053] A solenoid valve 56 is installed on the gas pipeline 53. The solenoid valve 56 is used to adjust the flame size of the gas nozzle 54. A temperature sensor 57 is installed at the output end of the powder conveying and air supply pipe 55. Both the temperature sensor 57 and the solenoid valve 56 are connected to a PLC control system 58. The PLC control system is used to control the on / off of the gas, the amount of gas supplied, and to detect the temperature of the output sodium bicarbonate powder.

[0054] A heat exchanger 11 is installed inside the sulfur-containing flue gas duct 6. One end of the heat exchanger 11 is connected to air, and the other end is connected to the pulverized coal conveying system 4. The heat exchanger 11 is used to preheat the air supplied to the pulverized coal conveying system 4. This device allows the supplied air to capture a large amount of heat from the high-temperature flue gas, thereby increasing the temperature of the supplied air itself. This saves energy for the subsequent pulverized coal heating heater 5 to heat the pulverized coal conveying air and improves the heating efficiency of the pulverized coal conveying air.

[0055] Heat exchanger 11 includes a shell 111, an inlet pipe 112, an outlet pipe 113, and heat-receiving pipes 114. The inlet pipe 112 is bent multiple times, meaning it bends and coils repeatedly in a plane to increase the heating area. One end of the inlet pipe 112 is sealed. The outlet pipe 113 has the same shape as the inlet pipe 112 and is arranged parallel to it. Multiple heat-receiving pipes 114 connect the outlet pipe 113 and the inlet pipe 112. The outlet pipe 113 and the inlet pipe 112 are fixed to the shell 111. Inside, the shell 111 is located inside the sulfur-containing flue gas duct 6. The shell 111 is open at both ends to ensure that the heating tube is completely immersed in the flowing high-temperature sulfur-containing flue gas. The air inside the heating tube is heated by the high-temperature flue gas inside the sulfur-containing flue gas duct. The open end of the air inlet pipe 112 is located outside the sulfur-containing flue gas duct 6. The air inlet pipe 112 passes through the shell 111 and the sulfur-containing flue gas duct 6 from the inside to the outside. The open end of the air outlet pipe 113 passes through the shell 111 and the sulfur-containing flue gas duct 6 from the inside to the outside and is connected to the powder feeding system 4.

[0056] The powder feeding system 4 includes a powder feeding fan 41 and a powder feeding pipe 42. The air inlet of the powder feeding fan 41 is connected to a heat exchanger 11 through an air pipe, and the output end of the powder feeding fan 41 is connected to the powder feeding pipe 42. The powder feeding pipe 42 is a Venturi pipe, which includes a gas-material mixing section 421, a converging section 422, a throat 423, and a diffuser section 424 connected in sequence. The gas-material mixing section 421 is connected to the output end of the powder feeding fan 41 and the grinder 1. The diffuser section 424 is connected to a powder-gas heater 5 through a pipe. An airflow mixer 43 is provided at the connection between the throat 423 and the diffuser section 424.

[0057] The airflow mixer 43 includes a rotating shaft 431, blades 432, and a support 433. The support 433 is welded from three steel square tubes and is in the shape of a herringbone. The support 433 is fixedly installed on the inner wall of the throat pipe 423. The rotating shaft 431 is located in the middle of the support 433. The blades 432 are mounted on the rotating shaft 431 through bearings. The blades 432 are rotated by wind power to improve the mixing uniformity of sodium bicarbonate in the powder conveying air supply, thereby improving the chemical reaction efficiency between the powder conveying air supply and the sulfur-containing flue gas.

[0058] The powder gas injector 10 includes four hot powder gas branch pipes 101. One end of each hot powder gas branch pipe 101 is fixedly connected to the end of the powder delivery and air supply pipe 55 located at the center of the sulfur-containing flue gas pipe 6. The other end of each hot powder gas branch pipe 101 is welded to the inner wall of the sulfur-containing flue gas pipe 6 via a metal rod. The four hot powder gas branch pipes 101 are arranged in a cross shape and are fixed inside the sulfur-containing flue gas pipe 6. Each hot powder gas branch pipe 101 is equipped with several powder gas nozzles 102. The powder gas nozzles 102 are Venturi nozzles, and the powder gas nozzles 102 are evenly spaced. The orientation of the powder gas nozzles 102 is the same as the flow direction of the flue gas inside the sulfur-containing flue gas pipe 6, thereby reducing the blowing pressure of the sulfur-containing flue gas on the powder gas nozzles.

[0059] The insulated box 51 is equipped with an air inlet 59 and a smoke exhaust outlet 510 for supplying oxygen required for gas combustion.

[0060] The operating method of the above-mentioned flue gas desulfurization device is as follows:

[0061] (1) Desulfurizing agent is placed in the silo 3, the solenoid valve 56 is opened, the gas nozzle 54 is ignited, and the heat storage rod 52 is heated. The heat storage rod 52 is used to heat the powder conveying and air supply pipe 55, which can ensure both heating efficiency and heating uniformity.

[0062] (2) When the work starts, the desulfurizing agent enters the grinding mill 1 through the feeder 2. After being ground by the grinding mill 1, the desulfurizing agent is ground into powder. Then, the powder blowing fan 41 uses the natural wind heated by the heat exchanger 11 to blow the ultrafine powder of the desulfurizing agent into the powder conveying air pipe 55.

[0063] (3) When the desulfurizing agent ultrafine powder flows through the powder conveying and air supply pipe 55, it is heated by the heat storage rod 52. The temperature inside the powder conveying and air supply pipe 55 reaches more than 140°, which makes the desulfurizing agent ultrafine powder into a fluffy popcorn shape. Then it enters the sulfur-containing flue gas pipe 6 and reacts chemically with SO2 in the sulfur-containing flue gas to produce byproduct Na2SO4. The byproduct Na2SO4 is recycled by the dust collector. The flue gas dust is captured and collected by the dust collector 7. After the flue gas is purified by the dust collector 7 and meets the standards, it is discharged into the atmosphere through the chimney 9.

[0064] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A flue gas desulfurization device, characterized in that, Includes grinding mill, feeder, silo, powder conveying system, powder-gas heater, sulfur-containing flue gas duct, dust collector, booster fan and chimney, among which: The silo is connected to a feeder, and the feeder, grinding mill, powder feeding system and powder gas heater are connected in sequence. The output end of the powder gas heater is connected to a sulfur-containing flue gas pipeline, and the output end of the sulfur-containing flue gas pipeline is connected to a dust collector. The dust collector is connected to a chimney through a booster fan. The powder gas heater includes an insulated box, a heat storage rod, a gas pipeline, a gas nozzle, and a powder conveying and air supply pipe. The heat storage rod is fixedly installed inside the insulated box, and the powder conveying and air supply pipe is spirally wound on the heat storage rod. The powder conveying and air supply pipe is connected to a powder conveying system at its input end and to a sulfur-containing flue gas pipeline at its output end through a powder gas injector. Several gas nozzles are installed inside the insulated box below the powder conveying and air supply pipe, and the gas nozzles are connected to a gas pipeline. A heat exchanger is installed inside the sulfur-containing flue gas pipeline. One end of the heat exchanger is connected to air, and the other end is connected to the pulverized coal feeding system. The heat exchanger includes a shell, an inlet pipe, an outlet pipe, and a heat transfer pipe. The inlet pipe is bent multiple times and one end is sealed. The outlet pipe has the same shape as the inlet pipe and is arranged parallel to it. A heat transfer pipe is installed between the outlet pipe and the inlet pipe. The outlet pipe and the inlet pipe are fixed inside the shell. The shell is located inside the sulfur-containing flue gas duct. The shell is open at both ends. The open end of the inlet pipe extends out of the shell and the sulfur-containing flue gas duct and is connected to the outside air. The open end of the outlet pipe extends out of the shell and the sulfur-containing flue gas duct and is connected to the powder feeding system. The powder feeding system includes a powder feeding fan and a powder feeding pipe. The inlet of the powder feeding fan is connected to a heat exchanger via an air pipe, and the outlet of the powder feeding fan is connected to the powder feeding pipe. The powder feeding pipe is a Venturi pipe, which includes a gas-material mixing section, a convergence section, a throat, and a diffusion section connected in sequence. The gas-material mixing section is connected to the outlet of the powder feeding fan and a grinder. The diffusion section is connected to a powder-gas heater via a pipe. An airflow mixer is installed at the connection between the throat and the diffusion section.

2. The flue gas desulfurization device as described in claim 1, characterized in that, The gas pipeline is equipped with a solenoid valve, and the output end of the powder conveying and air supply pipe is equipped with a temperature sensor. Both the temperature sensor and the solenoid valve are connected to a PLC control system.

3. The flue gas desulfurization device as described in claim 1, characterized in that, The airflow mixer includes a shaft, blades, and a support. The support is fixedly installed on the inner wall of the throat. The shaft is located in the middle of the support, and the blades are mounted on the shaft via bearings.

4. The flue gas desulfurization device as described in claim 1, characterized in that, The powder gas injector includes four hot powder gas branch pipes. One end of each hot powder gas branch pipe is fixedly connected to the end of the powder delivery and air supply pipe located in the center of the sulfur-containing flue gas pipeline. The other end of each hot powder gas branch pipe is welded to the inner wall of the sulfur-containing flue gas pipeline via a metal rod. The four hot powder gas branch pipes are arranged in a cross shape. Each hot powder gas branch pipe is equipped with several powder gas nozzles. The powder gas nozzles are evenly spaced, and the direction of the powder gas nozzles is the same as the flow direction of the flue gas in the sulfur-containing flue gas pipeline.

5. The flue gas desulfurization device as described in claim 1, characterized in that, The insulated box is equipped with an air inlet and a smoke exhaust outlet.

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