Desulfurizing tower

Abstract

The utility model provides a desulfurizing tower which comprises a tower body, and the tower body is divided into a lower spraying area and an upper absorbing area by a partition plate arranged in the tower body; a liquid storage tank is arranged at the bottom of the spraying area, a spraying layer is arranged between the liquid storage tank and the partition plate, and a flue gas inlet is formed in the side wall of the tower body between the liquid storage tank and the spraying layer; the absorption area is communicated with the spraying area through a communicating pipe; a material spraying pipe penetrating through the tower wall is arranged on the side wall of the tower body in the absorption area; and the spray pipe is connected with the discharge end of the cyclone separator and the quicklime powder storage bin. According to the desulfurization tower disclosed by the invention, through the cooperative use of the structure and the equipment, the flue gas of the boiler is desulfurized by adopting a wet desulfurization mode, and water mist mixed in the flue gas in the desulfurization process is removed by reacting with the quick lime; and the defects that the phenomena of chimney rain and white smoke are easily generated and are difficult to eliminate when the existing desulfurization tower adopts a wet desulfurization process to treat sulfur dioxide in boiler flue gas are overcome.

Description

Technical Field

[0001] This application relates to the field of boiler flue gas treatment technology, and in particular to a desulfurization tower. Background Technology

[0002] The sulfur in coal is oxidized by oxygen in the air during combustion and exists in the flue gas as sulfur dioxide. Sulfur dioxide, as an air pollutant, is a major culprit in the greenhouse effect and acid rain. Acid rain not only alters the chemical and physical properties of soil, preventing most plants from growing properly, but also acidifies water, corrodes buildings, causes biological mutations, and for humans, it can trigger respiratory diseases and even death. In my country, the economic losses caused by acid rain exceed hundreds of billions of yuan annually. Therefore, controlling sulfur dioxide emissions is of paramount importance for the environment, the economy, and human health.

[0003] Currently, in order to deal with sulfur dioxide produced by coal combustion, three major categories of technologies have been developed to control and reduce sulfur dioxide emissions, mainly: 1) pre-combustion desulfurization technology: including biological, physical and chemical methods; 2) in-combustion desulfurization technology: taking fluidized bed combustion and in-furnace calcium injection as examples; 3) post-combustion flue gas desulfurization technology: including semi-dry and wet flue gas desulfurization.

[0004] Considering equipment investment, processing costs, and desulfurization efficiency, wet flue gas desulfurization (FGD) is currently the most widely used desulfurization method. Its main desulfurization process involves using an alkaline slurry, such as lime slurry, as an absorbent, which comes into countercurrent contact with the boiler flue gas in the desulfurization tower, absorbing and removing sulfur dioxide and other acidic substances from the flue gas. However, in wet FGD, the desulfurization efficiency is maximized only when the flue gas temperature is cooled below the dew point of water. This results in the flue gas being nearly wet-saturated after the process, leading to "chimney rain" and "white smoke" phenomena when the flue gas encounters cold outside air after being discharged through the chimney.

[0005] While the phenomena of "chimney rain" and "white smoke" can be alleviated by installing demisters in the desulfurization tower, they are difficult to eliminate. Utility Model Content

[0006] This application provides a desulfurization tower to solve the problem that existing desulfurization towers using wet desulfurization processes to treat sulfur dioxide in boiler flue gas are prone to producing "chimney rain" and "white smoke" phenomena that are difficult to eliminate.

[0007] This application provides a desulfurization tower, including a tower body, which is divided into a lower spray zone and an upper absorption zone by an internally provided partition;

[0008] A liquid storage tank is set at the bottom of the spray zone, and a spray layer is set between the liquid storage tank and the baffle. A flue gas inlet is opened on the side wall of the tower between the liquid storage tank and the spray layer. The liquid storage tank is connected to the spray layer through a circulating pump.

[0009] The absorption zone is connected to the spray zone through a connecting pipe, and the inlet of the connecting pipe is located on the side wall of the tower body between the partition and the spray layer.

[0010] A gas outlet is provided at the top of the absorption zone, and the gas outlet is connected to the gas input end of the cyclone separator.

[0011] A spray pipe is installed on the side wall of the tower body in the absorption zone, passing through the tower wall; the spray pipe is connected to the discharge end of the cyclone separator and the quicklime powder storage silo; the output end of the spray pipe is located in the absorption zone, and the gas input end of the spray pipe is connected to the blower.

[0012] The outlet of the connecting pipe is located on the side wall of the tower body between the baffle and the output end of the spray pipe;

[0013] The absorption zone tower body has a discharge port located near the baffle plate on its side wall.

[0014] Optionally, a gas distribution pipe is horizontally arranged within the absorption zone, with the input end of the gas distribution pipe connected to the output port of the connecting pipe.

[0015] Optionally, the connection between the outlet of the connecting pipe and the air distribution pipe is a converging pipe.

[0016] Optionally, a heat exchanger is provided between the spray pipe and the blower, and the spray pipe is connected to the shell side of the blower and the heat exchanger;

[0017] The tube side of the heat exchanger is connected to the flue gas inlet.

[0018] Optionally, the gas distribution pipe includes a main gas pipe arranged circumferentially along the inner wall of the tower body in the absorption zone, and multiple gas branch pipes connected to the main gas pipe.

[0019] One end of the gas duct is connected to the main gas duct, and the other end is closed and extends towards the central axis of the tower.

[0020] Multiple exhaust holes are arrayed on the lower surface of the air guide branch.

[0021] Optionally, a guide plate is fixed on the lower surface of the gas guide branch pipe near the exhaust port; the guide plate is located on the side of the exhaust port away from the tower sidewall.

[0022] The guide plate bends towards the side wall of the tower, and the concave surface formed by the bending of the guide plate faces upward.

[0023] Optionally, the partition is inclined, with the end closer to the discharge port lower than the other end;

[0024] The lower surface of the partition is provided with an array of multiple conical protrusions.

[0025] The desulfurization tower provided in this application divides the tower body into a spray zone and an absorption zone by setting a baffle. In the spray zone, lime slurry is used to counter-currently spray and wash the flue gas to remove sulfur dioxide and acidic components. A connecting pipe between the spray zone and the absorption zone guides the sprayed flue gas into the absorption zone, where it reacts with quicklime powder from a quicklime powder storage silo. The water mist in the flue gas reacts with the quicklime to generate calcium hydroxide, removing moisture from the flue gas. Simultaneously, the calcium hydroxide further removes residual sulfur dioxide and acidic substances from the flue gas. Furthermore, the heat released from the reaction of water mist and quicklime also helps dry the damp quicklime powder. The flue gas treated in the absorption zone, along with the quicklime powder, enters a cyclone separator through the gas outlet for gas-solid separation. The separated solids are then recycled back into the absorption zone through the quicklime powder supply via the spray pipe and the quicklime powder storage silo. The desulfurization tower of this application, through the combined use of the above-mentioned structure and equipment, achieves desulfurization of boiler flue gas using wet desulfurization, while simultaneously removing the water mist mixed in the flue gas during the desulfurization process by reacting with quicklime. This eliminates the phenomena of "chimney rain" and "white smoke," overcoming the drawbacks of existing desulfurization towers that easily generate and are difficult to eliminate when using wet desulfurization technology to treat sulfur dioxide in boiler flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a desulfurization tower provided in one embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a desulfurization tower provided in another embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a desulfurization tower provided in another embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of an air distribution pipe provided in one embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a gas guide branch provided in an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the structure of a partition provided in one embodiment of this application.

[0033] Description of reference numerals:

[0034] 1. Tower body; 4. Fan; 5. Heat exchanger; 11. Baffle plate; 12. Connecting pipe; 21. Liquid storage tank; 22. Spray layer; 23. Circulating pump; 31. Cyclone separator; 32. Spray pipe; 33. Quicklime powder storage silo; 34. Gas distribution pipe; 101. Flue gas inlet; 102. Gas outlet; 103. Discharge port; 111. Conical protrusion; 341. Main gas pipe; 342. Gas branch pipe; 343. Guide plate; 3401. Exhaust port. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0036] like Figure 1 As shown, this application provides a desulfurization tower, including a tower body 1, which is divided into a lower spray zone and an upper absorption zone by an internally provided partition 11.

[0037] A liquid storage tank 21 is provided at the bottom of the spray zone, and a spray layer 22 is provided between the liquid storage tank 21 and the partition plate 11. A flue gas inlet 101 is provided on the side wall of the tower body 1 between the liquid storage tank 21 and the spray layer 22. The liquid storage tank 21 is connected to the spray layer 22 through a circulating pump 23.

[0038] The absorption zone is connected to the spray zone through the connecting pipe 12. The inlet of the connecting pipe 12 is located on the side wall of the tower body 1 between the partition 11 and the spray layer 22.

[0039] A gas outlet 102 is provided at the upper part of the absorption zone, and the gas outlet 102 is connected to the gas input end of the cyclone separator 31.

[0040] A spray pipe 32 is installed on the side wall of the tower body 1 in the absorption zone, passing through the tower wall; the spray pipe 32 is connected to the discharge end of the cyclone separator 31 and the quicklime powder storage silo 33; the output end of the spray pipe 32 is located in the absorption zone, and the gas input end of the spray pipe 32 is connected to the blower 4.

[0041] The outlet of the connecting pipe 12 is located on the side wall of the tower body between the partition plate 11 and the output end of the spray pipe 32;

[0042] The tower body 1 in the absorption zone has a discharge port 103 located near the partition plate 11 on its side wall.

[0043] In this application, corresponding control devices, such as electric gate valves, can be installed at the corresponding discharge points of the cyclone separator 31 and the quicklime powder storage silo 33 to control the discharge amount. The quicklime powder used in the quicklime powder storage silo 33 has a particle size of, for example, 200-300 mesh.

[0044] In actual production, demisters are installed inside the desulfurization tower to intercept water mist carried in the flue gas. However, while installing demisters can alleviate the "chimney rain" and "white smoke" phenomena, it is difficult to eliminate them. Therefore, heaters are installed above the desulfurization tower to heat the flue gas in order to avoid the "chimney rain" and "white smoke" phenomena. Obviously, this method is difficult to eliminate the "chimney rain" and "white smoke" phenomena. Moreover, installing heaters not only increases equipment costs but also requires a lot of energy.

[0045] In use, the flue gas to be desulfurized is fed into the spray zone of the tower body 1 through the flue gas inlet 101. The spray layer 22 sprays the absorbent slurry (lime slurry in this application) from top to bottom, making countercurrent contact with the upward flue gas, and contacting, reacting with and removing acidic gases such as sulfur dioxide in the flue gas. The lime slurry after contacting and reacting with the flue gas falls into the storage tank 21 at the bottom of the tower, and is then pumped by the circulation pump 23 and fed back into the spray layer 22 for circulation and washing (in one possible implementation, in order to avoid lime slurry sedimentation, an agitator can be installed in the storage tank 21 to continuously stir the slurry in the storage tank 21).

[0046] After being washed by the spray layer 22, the flue gas rises. At this point, the flue gas contains a large amount of water mist. When some of the flue gas rises and comes into contact with the baffle 11, the water mist in this part of the flue gas will condense on the baffle 11 and then drip down along the baffle 11. The remaining flue gas enters the absorption zone through the connecting pipe 12. After the flue gas discharged from the connecting pipe 12 enters the absorption zone, it rises. At this time, the blower 4 draws air from the outside and supplies it to the spray pipe 32. The air entering the spray pipe 32 blows the quicklime powder supplied from the quicklime powder storage silo 33 into the spray pipe 32 into the absorption zone. It comes into contact with and reacts with the water mist in the rising flue gas. The calcium hydroxide generated removes the moisture from the flue gas. Furthermore, the generated calcium hydroxide can absorb and further remove acidic gases such as sulfur dioxide that could not be removed in the spray zone from the flue gas; at the same time, the reaction between quicklime powder and water mist releases a large amount of heat, drying the damp lime powder and evaporating excess moisture (the evaporated moisture will then react with the quicklime powder, and so on); since the flue gas travels upward, the powder after the reaction will enter the cyclone separator 31 from the gas outlet 102 along with the flue gas for gas-solid separation. The separated gas will enter the subsequent processing section, while the solid will fall into the storage cavity of the cyclone separator 31 and be discharged from the discharge end into the spray pipe 32 in a controlled manner (e.g., using an electric gate valve), and then sprayed into the absorption zone along with the quicklime powder supplied from the quicklime powder storage silo 33 for recycling.

[0047] When the absorption is completed, or the lime powder accumulated on the absorption zone partition plate 11 reaches a certain height, the discharge port 103 can be opened to discharge the lime powder. The discharged lime powder can be used to prepare the absorption slurry in the liquid storage tank 21.

[0048] This application provides a desulfurization tower, which divides the tower body 1 into a spray zone and an absorption zone by a baffle 11. In the spray zone, lime slurry is used to counter-currently spray and wash the flue gas to remove sulfur dioxide and acidic components. A connecting pipe 12 connects the spray zone and the absorption zone, guiding the sprayed flue gas into the absorption zone where it reacts with quicklime powder from the quicklime powder storage silo 33, which is injected through the spray pipe 32. The water mist in the flue gas reacts with the quicklime to generate calcium hydroxide, removing moisture from the flue gas. Simultaneously, the calcium hydroxide further removes residual sulfur dioxide and acidic substances from the flue gas. Furthermore, the heat released from the reaction of the water mist and quicklime also dries the moist quicklime powder. The flue gas treated in the absorption zone, along with the quicklime powder, enters the cyclone separator 31 through the gas outlet 102 for gas-solid separation. The separated solids are then recycled back into the absorption zone through the quicklime provided by the spray pipe 32 and the quicklime powder storage silo 33. The desulfurization tower of this application, through the combined use of the above-mentioned structure and equipment, achieves desulfurization of boiler flue gas using wet desulfurization, while simultaneously removing the water mist mixed in the flue gas during the desulfurization process by reacting with quicklime. This eliminates the phenomena of "chimney rain" and "white smoke," overcoming the drawbacks of existing desulfurization towers that easily generate and are difficult to eliminate when using wet desulfurization technology to treat sulfur dioxide in boiler flue gas.

[0049] like Figure 2 As shown, optionally, an air distribution pipe 34 is horizontally arranged in the absorption zone, and the input end of the air distribution pipe 34 is connected to the output port of the connecting pipe 12.

[0050] In the present application, the provision of the gas distribution pipe 34 allows the flue gas entering the absorption zone to be evenly distributed and thus to move evenly from bottom to top.

[0051] like Figure 2 As shown, optionally, the connection between the output port of the connecting pipe 12 and the air distribution pipe 34 is a tapered pipe.

[0052] In the present application, the connection between the output port of the connecting pipe 12 and the air distribution pipe 34 is set as a tapered pipe. The tapered pipe at this time is equivalent to the throat of the Venturi throat, which can accelerate the flue gas so that the flue gas entering the absorption area has a certain speed and can blow up the quicklime powder sprayed by the injection pipe 32.

[0053] like Figure 3As shown, optionally, a heat exchanger 5 is provided between the spray pipe 32 and the fan 4, and the spray pipe 32 is connected to the fan 4 and the shell side of the heat exchanger 5;

[0054] The tube side of heat exchanger 5 is connected to the flue gas inlet 101.

[0055] In this application, a heat exchanger 5 is provided to utilize the waste heat of the flue gas to heat the air drawn in by the blower 4. This prevents the air drawn in by the blower 4 from being too cold when the outside temperature is low. If this cold air is injected into the absorption zone, the temperature inside the absorption zone would be too low, and the heat released from the contact between the quicklime powder and the water mist would be insufficient to dry the damp quicklime powder, leading to the undesirable consequence of quicklime powder agglomeration. Therefore, providing a heat exchanger 5 can reduce the waste of heat in the flue gas.

[0056] like Figure 4 As shown, optionally, the air distribution pipe 34 includes a main air pipe 341 arranged along the circumference of the inner wall of the tower body 1 of the absorption zone, and a plurality of air guide branch pipes 342 connected to the main air pipe 341;

[0057] One end of the air guide branch pipe 342 is connected to the main air guide pipe 341, and the other end is closed and extends toward the central axis of the tower body 1;

[0058] A plurality of exhaust holes 3401 are formed in an array on the lower surface of the air guide pipe 342 .

[0059] In this application, the main gas pipe 341 is arranged circumferentially along the inner wall of the tower body 1. Therefore, its shape varies with the cross-section of the inner wall of the tower body 1. Taking the cross-section of the inner wall of the tower body 1 as a circle as an example, the main gas pipe 341 is bent into a ring. At this time, both its ends are in the same direction and are connected to the connecting pipe 12 as gas inlets. In this way, the gas supply to the main gas pipe 341 will be bidirectional, which can stabilize the gas pressure and reduce the occurrence of malfunctions during gas supply.

[0060] Providing the exhaust hole 3401 on the lower surface of the air guide branch pipe 342 can prevent the falling quicklime powder from falling into the exhaust hole 3401 and causing the exhaust hole 3401 to be blocked.

[0061] like Figure 5 As shown, optionally, a guide piece 343 is fixed on the lower surface of the air guide pipe 342 near the exhaust hole 3401; the guide piece 343 is arranged on the side of the exhaust hole 3401 away from the side wall of the tower body 1;

[0062] The guide piece 343 is bent toward the side wall of the tower body 1 , and the concave surface formed by the bending of the guide piece 343 faces upward.

[0063] In this application, the curved shape of the guide plate 343 can change the direction of the flue gas discharged from the exhaust port 3401 to an upward direction, thereby causing the flue gas to blow upward and blow up the quicklime powder sprayed from the spray pipe 32, reducing the amount of quicklime powder that falls directly onto the baffle plate 11 without contacting the flue gas, so as to achieve full contact between the quicklime powder and the baffle plate.

[0064] like Figure 1 and Figure 6 As shown, optionally, the partition 11 is inclined, and the end near the discharge port 103 is lower than the other end;

[0065] The lower surface of the partition 11 is provided with a plurality of conical protrusions 111.

[0066] In this application, the partition 11 is inclined and the end near the discharge port 103 is lower than the other end. This arrangement facilitates the discharge of lime powder falling on the partition 11 from the discharge port 103.

[0067] On the lower surface of the baffle 11, which is also the top of the spray zone, multiple conical protrusions 111 are arranged in an array. When the flue gas carrying water mist comes into contact with the lower surface of the baffle 11 and the conical protrusions 111, the condensed droplets can drip down along the top of the conical protrusions 111, that is, the conical protrusions 111 play a guiding role. The conical protrusions 111 are arranged perpendicular to the lower surface of the baffle 11.

[0068] A desulfurization tower, the usage process of which is as follows:

[0069] In use, the flue gas to be desulfurized is cooled by heat exchanger 5 and then fed into the spray zone of tower body 1 through flue gas inlet 101. The spray layer 22 sprays the absorbent slurry (lime slurry in this application) from top to bottom, making countercurrent contact with the upward flue gas, and contacting and reacting with acidic gases such as sulfur dioxide in the flue gas to remove them. The lime slurry after contacting and reacting with the flue gas falls into the storage tank 21 at the bottom of the tower, and is then pumped by the circulation pump 23 and fed back into the spray layer 22 for circulation and washing (in one possible implementation, in order to avoid lime slurry sedimentation, an agitator can be installed in the storage tank 21 to continuously stir the slurry in the storage tank 21).

[0070] After being washed by the spray layer 22, the flue gas rises. At this time, the flue gas contains a large amount of water mist. When part of the flue gas rises and comes into contact with the baffle 11, the water mist in this part of the flue gas will condense on the baffle 11 and then drip down along the cone-shaped protrusion 111 on the baffle 11. The remaining flue gas enters the absorption zone along the connecting pipe 12. The flue gas containing water mist discharged from the connecting pipe 12 increases in velocity after passing through the converging pipe and then enters the gas distribution pipe 34. From the main gas pipe 341 of the gas distribution pipe 34, it is distributed to multiple gas guide branches 342 and discharged from the exhaust hole 3401 on the lower surface of the gas guide branch 342. When the discharged gas encounters the guide plate 343, the direction of the flue gas will be reversed and travel in an oblique upward direction. At this time, the fan 4 draws air from the outside and exchanges heat with the flue gas in the heat exchanger 5, and then supplies it to the spray pipe 32. The hot air entering the spray pipe 32 sprays the quicklime powder supplied from the quicklime powder storage silo 33 into the absorption zone, where it comes into contact with and reacts with the water mist in the upward flue gas. The generated calcium hydroxide removes the moisture from the flue gas. Furthermore, the generated calcium hydroxide can absorb and further remove acidic gases such as sulfur dioxide that could not be removed in the spray zone from the flue gas; at the same time, the reaction between quicklime powder and water mist releases a large amount of heat, drying the damp lime powder and evaporating excess moisture (the evaporated moisture will then react with the quicklime powder, and so on); since the flue gas travels upward, the powder after the reaction will enter the cyclone separator 31 from the gas outlet 102 along with the flue gas for gas-solid separation. The separated gas will enter the subsequent processing section, while the solid will fall into the storage cavity of the cyclone separator 31 and be discharged from the discharge end into the spray pipe 32 in a controlled manner (e.g., using an electric gate valve), and then sprayed into the absorption zone along with the quicklime powder supplied from the quicklime powder storage silo 33 for recycling.

[0071] After absorption is complete, or when the lime powder accumulated on the absorption partition plate reaches a certain height, the discharge port 103 can be opened to discharge the lime powder. The discharged lime powder can be used to prepare the absorption slurry for the storage tank 21.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A desulfurization tower, characterized in that: It comprises a tower body (1), wherein the tower body (1) is divided into a spraying area at the bottom and an absorption area at the top by a partition (11) arranged inside; A liquid reservoir (21) is provided at the bottom of the spraying area, a spraying layer (22) is provided between the liquid reservoir (21) and the partition (11), and a smoke inlet (101) is provided on the side wall of the tower body (1) between the liquid reservoir (21) and the spraying layer (22); the liquid reservoir (21) is connected to the spraying layer (22) via a circulation pump (23); The absorption zone is connected to the spray zone via a connecting pipe (12), and the input port of the connecting pipe (12) is arranged on the side wall of the tower body (1) between the partition plate (11) and the spray layer (22); A gas outlet (102) is provided at the upper portion of the absorption zone, and the gas outlet (102) is connected to a gas input end of a cyclone separator (31); A spray pipe (32) passing through the tower wall is arranged on the side wall of the tower body (1) of the absorption zone; the spray pipe (32) is connected to the discharge end of the cyclone separator (31) and the quicklime powder storage bin (33); the output end of the spray pipe (32) is located in the absorption zone, and the gas input end of the spray pipe (32) is connected to the fan (4); The output port of the connecting pipe (12) is located on the side wall of the tower body between the partition plate (11) and the output end of the injection pipe (32); A discharge port (103) close to the partition plate (11) is provided on the side wall of the tower body (1) of the absorption zone.

2. The desulfurization tower according to claim 1, characterized in that: An air distribution pipe (34) is horizontally arranged in the absorption zone, and an input end of the air distribution pipe (34) is connected to an output port of the connecting pipe (12).

3. The desulfurization tower according to claim 2, characterized in that: The connection point between the output port of the connecting pipe (12) and the air distribution pipe (34) is a tapered pipe.

4. The desulfurization tower according to claim 1, characterized in that: A heat exchanger (5) is provided between the injection pipe (32) and the fan (4), and the injection pipe (32) is connected to the fan (4) and the shell side of the heat exchanger (5); The tube side of the heat exchanger (5) is in communication with the flue gas inlet (101).

5. The desulfurization tower according to claim 2, characterized in that: The gas distribution pipe (34) comprises a main gas pipe (341) arranged along the circumference of the inner wall of the tower body (1) of the absorption zone, and a plurality of gas branch pipes (342) connected to the main gas pipe (341); One end of the air guide branch pipe (342) is connected to the main air guide pipe (341), and the other end is closed and extends toward the central axis of the tower body (1); The lower surface of the air guide branch pipe (342) is provided with a plurality of exhaust holes (3401) in an array.

6. The desulfurization tower according to claim 5, characterized in that: A guide plate (343) is fixed on the lower surface of the air guide branch pipe (342) at a position close to the exhaust hole (3401); the guide plate (343) is arranged on a side of the exhaust hole (3401) away from the side wall of the tower body (1); The guide piece (343) is bent toward the side wall direction of the tower body (1), and the concave surface formed by the bending of the guide piece (343) faces upward.

7. The desulfurization tower according to any one of claims 1 to 6, characterized in that: The partition plate (11) is arranged obliquely, and one end close to the discharge port (103) is lower than the other end; The lower surface of the partition (11) is provided with a plurality of cone-shaped protrusions (111) in an array.

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