Flue gas solid desulfurization device

Abstract

The invention discloses a flue gas solid desulfurization device which comprises a desulfurization tower, a hydrogen sulfide solid desulfurization agent bed layer is arranged in an inner cavity of the desulfurization tower, a sulfur dioxide solid desulfurization agent bed layer is arranged below the hydrogen sulfide solid desulfurization agent bed layer, and a flue gas inlet is formed in the side wall of the desulfurization tower. The flue gas inlet is located above the hydrogen sulfide solid desulfurizing agent bed layer, a flue gas discharge port is formed in the side wall of the desulfurizing tower, and the flue gas discharge port is located below the sulfur dioxide solid desulfurizing agent bed layer. The method has the beneficial effects that the hydrogen sulfide solid desulfurizing agent bed layer is subjected to exothermic reaction to obtain a product, the product and oxygen contained in the flue gas are subjected to violent exothermic reaction to generate elemental sulfur, and heat released in the reaction process enables the temperature in the desulfurizing tower to rise, so that the temperature rise time in the desulfurizing tower is shortened, water separated out from the flue gas is reduced, and the desulfurization efficiency is improved. Strong corrosive liquid formed by combination of water and sulfur dioxide is greatly reduced, and the service life of the desulfurization tower is ensured.

Description

Technical Field

[0001] This invention relates to flue gas desulfurization technology, specifically to a flue gas solid desulfurization device. Background Technology

[0002] In industrial production, sulfur-containing waste gases emitted from combustion are a major cause of global acid rain. Industrial flue gas mainly consists of water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrogen sulfide, and nitrogen oxides. Controlling the concentration of sulfides is the primary measure for achieving emission standards. Since the hydrogen sulfide content in flue gas is generally low, organized emissions through chimneys can meet the requirements of the "Odor Pollutant Emission Standard." However, sulfur dioxide concentrations are higher, generally requiring additional desulfurization measures to achieve emission standards.

[0003] Currently, solid-state desulfurization is a common measure to ensure flue gas meets emission standards. During desulfurization, high-temperature flue gas enters a desulfurization device equipped with a desulfurizing agent bed. The solid desulfurizing agent removes sulfur dioxide from the flue gas through adsorption, achieving compliant emissions. However, because the flue gas temperature is around 250℃, when the high-temperature flue gas enters a desulfurization device equipped with a cold-state desulfurizing agent, water will be released from the flue gas. This released water may cause a decrease in catalyst performance. Furthermore, the released water can combine with the sulfur dioxide in the flue gas to form a highly corrosive liquid. This highly corrosive liquid will settle at the bottom of the equipment, severely corroding it and shortening its service life. Summary of the Invention

[0004] The technical problem to be solved by this invention is that when high-temperature flue gas enters the desulfurization equipment, it will generate a highly corrosive liquid, which will cause the desulfurization equipment to be corroded by the corrosive liquid and have a short service life. The purpose is to provide a flue gas solid desulfurization device that reduces the moisture released from the flue gas. The heat generated by the thermal reaction can also evaporate the moisture, thereby greatly reducing the highly corrosive liquid formed by the combination of moisture and sulfur dioxide and improving the service life of the desulfurization tower.

[0005] This invention is achieved through the following technical solution:

[0006] A flue gas solid desulfurization device includes a desulfurization tower. The inner cavity of the desulfurization tower is provided with a hydrogen sulfide solid desulfurizing agent bed, and a sulfur dioxide solid desulfurizing agent bed is provided below the hydrogen sulfide solid desulfurizing agent bed. A flue gas inlet is provided on the side wall of the desulfurization tower, located above the hydrogen sulfide solid desulfurizing agent bed. A flue gas outlet is provided on the side wall of the desulfurization tower, located below the sulfur dioxide solid desulfurizing agent bed.

[0007] The beneficial effects of this invention are as follows: by setting up a desulfurization tower, when the high-temperature flue gas enters the tower, it cools down and releases free water (due to the large temperature difference between the flue gas and the inside of the desulfurization tower). Hydrogen sulfide reacts exothermically with the hydrogen sulfide solid desulfurizing agent bed placed above the sulfur dioxide solid desulfurizing agent bed to obtain products. These products then react violently with oxygen contained in the flue gas to produce elemental sulfur. The heat released during the above reaction process raises the temperature inside the desulfurization tower, shortens the heating time inside the tower, reduces the moisture released from the flue gas, and the heat generated by the thermal reaction also evaporates the moisture, thereby greatly reducing the highly corrosive liquid formed by the combination of moisture and sulfur dioxide, and improving the service life of the desulfurization tower.

[0008] In some embodiments, a middle wire mesh and a bottom wire mesh are also included, with the hydrogen sulfide solid desulfurizer bed disposed at the upper end of the middle wire mesh and the sulfur dioxide solid desulfurizer bed disposed at the upper end of the bottom wire mesh. The middle wire mesh and the bottom wire mesh are used to support the hydrogen sulfide solid desulfurizer bed and the sulfur dioxide solid desulfurizer bed, respectively.

[0009] In some embodiments, a support grid plate is further included. The bottom wire mesh includes a first bottom wire mesh and a second bottom wire mesh. The support grid plate is connected to the bottom of the second bottom wire mesh, and inert ceramic balls are disposed between the first bottom wire mesh and the second bottom wire mesh. The support grid plate prevents the solid sulfur dioxide desulfurizing agent from falling off, and the inert ceramic balls are used to fix the desulfurizing agent and prevent it from falling off.

[0010] In some embodiments, the system further includes a flue gas inlet pipeline and a nitrogen inlet pipeline, wherein the nitrogen inlet pipeline is connected in parallel to the flue gas inlet pipeline and is connected to the flue gas inlet. By providing the nitrogen inlet pipeline, nitrogen is introduced into the desulfurization tower after each use of the desulfurizing agent to replace the residual sulfur-containing gas in the tower.

[0011] In some embodiments, a heat exchanger is further included, which is connected to the flue gas inlet pipeline and located between the nitrogen inlet pipeline and the flue gas inlet. The heat exchanger covers the bottom of the desulfurization tower. By providing the heat exchanger, the high-temperature flue gas (approximately 250°C) inside the heat exchanger heats the bottom of the desulfurization tower, thereby increasing the temperature of the desulfurization tower, reducing the temperature difference when the flue gas enters the desulfurization tower, reducing the precipitation of moisture from the flue gas, and evaporating the moisture remaining at the bottom of the desulfurization tower. This further reduces the amount of highly corrosive liquid generated, ensuring the service life of the desulfurization tower.

[0012] In some embodiments, the heat exchanger is generally cylindrical, with an arc-shaped groove at its top that fits into the bottom of the desulfurization tower. This increases the contact area between the heat exchanger and the bottom of the desulfurization tower, improving the heating effect on the bottom of the tower.

[0013] In some embodiments, an air inlet connected to a flue gas inlet pipe is provided at the bottom of one side of the heat exchanger, and an air outlet for flue gas to flow out is provided on the side of the heat exchanger away from the air inlet. The air outlet is connected to the flue gas discharge port through a heat exchange chamber outlet pipeline, which constitutes the flue gas inlet pipeline. Positioning the air inlet at the bottom of the heat exchanger facilitates the complete entry of flue gas into the top of the heat exchange chamber, improving the heating effect on the bottom of the desulfurization tower.

[0014] In some embodiments, a dehydrating agent is disposed above and / or below the sulfur dioxide solid desulfurizing agent bed. By using a dehydrating agent to absorb the water released from the flue gas, the generation of corrosive liquids is further reduced, thereby improving the service life of the desulfurization tower.

[0015] In some embodiments, the system further includes a chimney pipeline and a flue gas outlet pipeline. One end of the chimney pipeline is connected to the flue gas inlet pipeline, and the other end is connected to the chimney. One end of the flue gas outlet pipeline is connected to the flue gas emission port, and the other end is connected to the chimney. An online sulfur dioxide detector is installed on the flue gas inlet pipeline, located upstream of the nitrogen inlet pipeline and the chimney pipeline. This allows the flue gas to be discharged into a desulfurization tower for desulfurization treatment when the online sulfur dioxide detector detects that the sulfur dioxide concentration in the flue gas exceeds the standard. The treated, qualified flue gas then enters the chimney through the flue gas outlet pipeline. If the carbon dioxide concentration in the flue gas is detected to be within the standard, the flue gas is directly discharged into the chimney.

[0016] In some embodiments, the chimney pipeline, flue gas outlet pipeline, and flue gas inlet pipeline are respectively equipped with a chimney shut-off valve, a desulfurization tower outlet flue gas shut-off valve, and a desulfurization tower inlet flue gas shut-off valve. These valves control the opening and closing of the chimney pipeline, flue gas outlet pipeline, and flue gas inlet pipeline.

[0017] In some embodiments, the chimney shut-off valve, the desulfurization tower outlet flue gas shut-off valve, and the desulfurization tower inlet flue gas shut-off valve are all solenoid valves and are electrically connected to the control terminal. This facilitates automatic control by controlling the operating status of the chimney shut-off valve, the desulfurization tower outlet flue gas shut-off valve, and the desulfurization tower inlet flue gas shut-off valve through the control terminal.

[0018] In some embodiments, a differential pressure pipeline is also included, one end of which is connected to the top of the desulfurization tower and the other end to the bottom of the desulfurization tower. A differential pressure gauge is installed on the differential pressure pipeline. By setting the differential pressure gauge to detect the pressure difference between the upper and lower ends of the desulfurization tower cavity, if the pressure difference exceeds the normal value, it can be used to determine whether the desulfurizing agent has pulverized, so that the desulfurizing agent can be replaced in a timely manner.

[0019] In some embodiments, a discharge port is also included, which is disposed on the side wall of the desulfurization tower. The discharge port facilitates the replacement of the desulfurizing agent.

[0020] In some embodiments, the distance between the lower edge of the discharge port and the support grid is 100mm-300mm. This prevents the distance between the discharge port and the support grid from being too far, making it inconvenient to replace the desulfurizing agent, and from being too close, affecting the thickness of the desulfurizing agent layer.

[0021] In some embodiments, a drain line is also included, which is connected to the bottom of the desulfurization tower and is equipped with a shut-off valve. By providing the drain line to discharge the products from the desulfurization tower, excessive product accumulation and corrosion of the desulfurization tower are prevented.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. Hydrogen sulfide in the flue gas reacts exothermically with the hydrogen sulfide solid desulfurizer bed placed above the sulfur dioxide solid desulfurizer bed to produce products. The products then react violently with oxygen in the flue gas to produce elemental sulfur. The heat released during the reaction raises the temperature inside the desulfurization tower, shortens the heating time inside the desulfurization tower, reduces the moisture released from the flue gas, and at the same time, the heat generated by the thermal reaction can also evaporate the moisture, thereby greatly reducing the highly corrosive liquid formed by the combination of moisture and sulfur dioxide, and improving the service life of the desulfurization tower.

[0024] 2. Support grids are installed to prevent solid sulfur dioxide desulfurizing agent from falling off, and inert ceramic balls are installed to improve the flow capacity of the desulfurizing agent.

[0025] 3. The high-temperature flue gas (around 250°C) inside the heat exchanger heats the bottom of the desulfurization tower, increasing the tower's temperature and reducing the temperature difference when the flue gas enters the tower. This reduces the amount of moisture released from the flue gas and evaporates any remaining moisture at the bottom of the tower, further reducing the amount of highly corrosive liquid produced and ensuring the tower's service life.

[0026] 4. A dehydrating agent is installed to absorb the water released from the flue gas, further reducing the generation of corrosive liquids and improving the service life of the desulfurization tower.

[0027] 5. By setting up a differential pressure gauge to detect the pressure difference between the upper and lower ends of the desulfurization tower cavity, if the pressure difference exceeds the normal value, it can be used to determine whether the desulfurizing agent has pulverized, so that the desulfurizing agent can be replaced in time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] In the picture:

[0030] Figure 1 This is a partial structural diagram of the present invention;

[0031] Figure 2 This is a partial structural diagram of the present invention;

[0032] Figure 3 This is a partial structural diagram of the present invention;

[0033] Figure 4 This is a structural diagram of the present invention.

[0034] The attached diagram shows the markings and corresponding component names:

[0035] 1-Desulfurization tower, 2-Hydrogen sulfide solid desulfurizing agent bed, 3-Middle wire mesh, 4-Sulfur dioxide solid desulfurizing agent bed, 5-Support grid plate, 61-First bottom wire mesh, 62-Second bottom wire mesh, 7-Inert ceramic balls, 8-Loading port, 9-Discharging port, 10-Flue gas inlet pipeline, 11-Nitrogen inlet pipeline, 12-Flue gas outlet pipeline, 13-Sewage discharge pipeline, 14-Heat exchanger, 15-Heat exchange chamber outlet pipeline, 16-Sulfur dioxide online detector, 17-Chimney shut-off valve, 18-Desulfurization tower inlet flue gas shut-off valve, 19-Desulfurization tower outlet flue gas shut-off valve, 20-Dehydrating agent, 21-Differential pressure gauge. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0037] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0039] The terms "first," "second," etc., used in this invention are merely for clarity of description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" as used herein, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0040] This embodiment provides a flue gas solid desulfurization device; see [link / reference] Figures 1-4The system includes a desulfurization tower 1, an inner cavity of which is provided with a hydrogen sulfide solid desulfurizing agent bed 2, a sulfur dioxide solid desulfurizing agent bed 4 below the hydrogen sulfide solid desulfurizing agent bed 2, a flue gas inlet on the side wall of the desulfurization tower 1 located above the hydrogen sulfide solid desulfurizing agent bed 2, and a flue gas outlet on the side wall of the desulfurization tower 1 located below the sulfur dioxide solid desulfurizing agent bed 4. By setting up a desulfurization tower 1, when high-temperature flue gas enters the desulfurization tower 1, the flue gas cools down and releases free water (due to the large temperature difference between the flue gas and the inside of the desulfurization tower 1). Hydrogen sulfide reacts exothermically with the hydrogen sulfide solid desulfurizing agent bed 2 located above the sulfur dioxide solid desulfurizing agent bed 4 to obtain products. The products then react violently with the oxygen contained in the flue gas to produce elemental sulfur. The heat released during the above reaction process causes the temperature inside the desulfurization tower 1 to rise, shortening the heating time inside the desulfurization tower 1 and reducing the moisture released from the flue gas. At the same time, the heat generated by the thermal reaction can also evaporate the moisture, thereby greatly reducing the highly corrosive liquid formed by the combination of moisture and sulfur dioxide, and improving the service life of the desulfurization tower 1.

[0041] Among them, hydrogen sulfide solid desulfurizers can be iron oxide or zinc oxide, etc. Sulfur dioxide solid desulfurizers can use commonly used sulfur dioxide solid desulfurizers, such as calcium-based desulfurizers. Taking iron oxide solid desulfurizers as an example, their reaction principle with hydrogen sulfide, oxygen, and condensate formed in the flue gas is as follows:

[0042] Fe2O3.H2O+3H2S→Fe2S3.H2O+3H2O+5.2kcal / gmolH2S

[0043] This desulfurization process is an exothermic reaction. Since the flue gas generally contains about 3% oxygen, Fe2S3·H2O reacts with oxygen to convert Fe2S3·H2O into Fe2O3·H2O and generate elemental sulfur. The reaction equation is as follows:

[0044] Fe2S3.H2O+3 / 2O2→Fe2O3.H2O+3S+47.1kcal / gmolH2S

[0045] This reaction is a violently exothermic reaction. The heat generated by the reaction can increase the overall heating rate of the desulfurizing agent, shorten the time to reach temperature equilibrium, and thus reduce the generation of condensate.

[0046] See Figures 1 to 4It also includes a middle wire mesh 3 and a bottom wire mesh. The hydrogen sulfide solid desulfurizer bed 2 is disposed above the middle wire mesh 3, and the sulfur dioxide solid desulfurizer bed 4 is disposed above the bottom wire mesh. The middle wire mesh 3 and the bottom wire mesh are used to support the hydrogen sulfide solid desulfurizer bed 2 and the sulfur dioxide solid desulfurizer bed 4, respectively. The aperture of the middle wire mesh 3 and the bottom wire mesh is smaller than the diameter of the corresponding solid desulfurizer.

[0047] See Figures 1 to 4 It also includes a support grid plate 5. The bottom wire mesh includes a first bottom wire mesh 61 and a second bottom wire mesh 62. The support grid plate 5 is connected to the bottom of the second bottom wire mesh 62. An inert ceramic ball 7 is disposed between the first bottom wire mesh 61 and the second bottom wire mesh 62. The support grid plate 5 is provided to prevent the sulfur dioxide solid desulfurizing agent from falling off, and the inert ceramic ball 7 is provided to fix the solid desulfurizing agent and prevent it from falling off.

[0048] See Figures 1 to 4 It also includes a flue gas inlet pipeline 10 and a nitrogen inlet pipeline 11, with the nitrogen inlet pipeline 11 connected in parallel to the flue gas inlet pipeline 10, and the flue gas inlet pipeline 10 connected to the flue gas inlet. By providing the nitrogen inlet pipeline 11, nitrogen is introduced into the desulfurization tower 1 after each use of the desulfurizing agent to replace any residual sulfur-containing gases. Both the flue gas inlet pipeline 10 and the nitrogen inlet pipeline 11 are equipped with one-way valves.

[0049] See Figures 1 to 4 The desulfurization tower 1 has a discharge port 9 on one side for replacing or placing the desulfurizing agent. The side wall of the desulfurization tower 1 also has a flue gas inlet that can serve as a desulfurizing agent loading port 8, reducing the number of openings in the equipment. A drain pipe 13 is installed at the bottom of the desulfurization tower 1 to discharge waste located at the bottom of the tower.

[0050] See Figure 3 and Figure 4 The system also includes a heat exchanger 14, which is connected to the flue gas inlet pipeline 10. The heat exchanger 14 is located between the nitrogen inlet pipeline 11 and the flue gas inlet, and covers the bottom of the desulfurization tower 1. By setting the heat exchanger 14, the high-temperature flue gas (approximately 250°C) inside the heat exchanger 14 heats the bottom of the desulfurization tower 1, thereby increasing the temperature of the desulfurization tower 1, reducing the temperature difference when the flue gas enters the desulfurization tower 1, reducing the precipitation of moisture from the flue gas, and evaporating the moisture remaining at the bottom of the desulfurization tower 1, further reducing the amount of highly corrosive liquid generated and ensuring the service life of the desulfurization tower 1.

[0051] See Figure 3 and Figure 4The heat exchanger 14 is generally cylindrical and shell-shaped, with an arc-shaped groove on its top that fits into the bottom of the desulfurization tower 1. This increases the contact area between the heat exchanger 14 and the bottom of the desulfurization tower 1, thereby improving the heating effect on the bottom of the desulfurization tower 1.

[0052] See Figure 3 and Figure 4 The heat exchanger 14 has an air inlet at its bottom side connected to the flue gas inlet pipe, and an air outlet for flue gas flow at its side away from the air inlet. The air outlet and the flue gas discharge port are connected through a heat exchange chamber outlet pipe 15, which constitutes the flue gas inlet pipe 10. Positioning the air inlet at the bottom side of the heat exchanger 14 allows all the flue gas to enter the top of the heat exchange chamber, improving the heating effect on the bottom of the desulfurization tower 1.

[0053] See Figure 2 A dehydrating agent 20 is disposed above and / or below the sulfur dioxide solid desulfurizing agent bed 4. By using the dehydrating agent 20 to absorb the water released from the flue gas, the generation of corrosive liquid is further reduced, thereby improving the service life of the desulfurization tower 1.

[0054] See Figure 3 and Figure 4 It also includes a chimney pipeline and a flue gas outlet pipeline 12. One end of the chimney pipeline is connected to the flue gas inlet pipeline 10, and the other end is connected to the chimney. One end of the flue gas outlet pipeline 12 is connected to the flue gas emission port, and the other end is connected to the chimney. An online sulfur dioxide detector 16 is installed on the flue gas inlet pipeline 10, and the online sulfur dioxide detector 16 is located upstream of the nitrogen inlet pipeline 11 and the chimney pipeline. This allows the flue gas to be discharged into the desulfurization tower 1 for desulfurization treatment when the online sulfur dioxide detector 16 detects that the sulfur dioxide concentration in the flue gas exceeds the standard. The treated qualified flue gas then enters the chimney through the flue gas outlet pipeline 12. If the carbon dioxide concentration in the flue gas does not exceed the standard, the flue gas is directly discharged into the chimney. The chimney pipeline, flue gas outlet pipeline 12, and flue gas inlet pipeline 10 are respectively equipped with a chimney shut-off valve 17, a desulfurization tower outlet flue gas shut-off valve 19, and a desulfurization tower inlet flue gas shut-off valve 18. The chimney shut-off valve 17, the desulfurization tower outlet flue gas shut-off valve 19, and the desulfurization tower inlet flue gas shut-off valve 18 are all solenoid valves and are all electrically connected to the control terminal.

[0055] See Figure 2It also includes a differential pressure pipeline, one end of which is connected to the top of the desulfurization tower 1, and the other end is connected to the bottom of the desulfurization tower 1. A differential pressure gauge 21 is installed on the differential pressure pipeline. By setting the differential pressure gauge 21 to detect the pressure difference between the upper and lower ends of the inner cavity of the desulfurization tower 1, if the pressure difference exceeds the normal value, it is found that the desulfurizing agent has pulverized. This allows for the detection of desulfurizing agent pulverization without removing the desulfurizing agent, facilitating timely replacement of the desulfurizing agent.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flue gas solid desulfurization device, characterized in that, The system includes a desulfurization tower, the inner cavity of which is provided with a hydrogen sulfide solid desulfurizing agent bed, and a sulfur dioxide solid desulfurizing agent bed below the hydrogen sulfide solid desulfurizing agent bed. The side wall of the desulfurization tower is provided with a flue gas inlet located above the hydrogen sulfide solid desulfurizing agent bed, and the side wall of the desulfurization tower is provided with a flue gas outlet located below the sulfur dioxide solid desulfurizing agent bed.

2. The flue gas solid desulfurization device according to claim 1, characterized in that, It also includes a middle wire mesh and a bottom wire mesh, with the hydrogen sulfide solid desulfurizer bed disposed at the upper end of the middle wire mesh and the sulfur dioxide solid desulfurizer bed disposed at the upper end of the bottom wire mesh.

3. The flue gas solid desulfurization device according to claim 2, characterized in that, It also includes a support grid plate, and the bottom wire mesh includes a first bottom wire mesh and a second bottom wire mesh. The support grid plate is connected to the bottom of the second bottom wire mesh, and an inert ceramic ball is disposed between the first bottom wire mesh and the second bottom wire mesh.

4. The flue gas solid desulfurization device according to claim 1, characterized in that, It also includes a flue gas inlet pipeline and a nitrogen inlet pipeline, wherein the nitrogen inlet pipeline is connected in parallel to the flue gas inlet pipeline and the flue gas inlet pipeline is connected to the flue gas inlet.

5. The flue gas solid desulfurization device according to claim 4, characterized in that, It also includes a heat exchanger, which is connected to the flue gas inlet pipeline and covers the bottom of the desulfurization tower.

6. The flue gas solid desulfurization device according to claim 5, characterized in that, The heat exchanger is cylindrical in shape, and the top of the heat exchanger is provided with an arc-shaped groove that fits into the bottom of the desulfurization tower.

7. The flue gas solid desulfurization device according to claim 6, characterized in that, The bottom of one side of the heat exchanger is provided with an air inlet that is connected to the flue gas inlet pipe. The side of the heat exchanger away from the air inlet is provided with an air outlet for the flue gas to flow out. The air outlet and the flue gas discharge port are connected through the heat exchange chamber outlet pipeline, and the heat exchange chamber outlet pipeline constitutes the flue gas inlet pipeline.

8. The flue gas solid desulfurization device according to any one of claims 1-7, characterized in that, A dehydrating agent is disposed above and / or below the sulfur dioxide solid desulfurizing agent bed.

9. The flue gas solid desulfurization device according to any one of claims 1-7, characterized in that, It also includes a chimney pipeline and a flue gas outlet pipeline. The chimney pipeline is used to directly input flue gas into the chimney, and the flue gas outlet pipeline is used to input the flue gas discharged from the desulfurization tower into the chimney. An online sulfur dioxide detector is installed on the flue gas inlet pipeline, and the online sulfur dioxide detector is located upstream of the nitrogen inlet pipeline and the chimney pipeline.

10. The flue gas solid desulfurization device according to claim 9, characterized in that, The chimney pipeline, flue gas outlet pipeline, and flue gas inlet pipeline are respectively equipped with a chimney shut-off valve, a desulfurization tower outlet flue gas shut-off valve, and a desulfurization tower inlet flue gas shut-off valve.

11. The flue gas solid desulfurization device according to claim 10, characterized in that, The chimney shut-off valve, the desulfurization tower outlet flue gas shut-off valve, and the desulfurization tower inlet flue gas shut-off valve are all solenoid valves and are all electrically connected to the control terminal.

12. The flue gas solid desulfurization device according to any one of claims 1-7, characterized in that, It also includes a differential pressure pipeline, one end of which is connected to the top of the desulfurization tower and the other end of which is connected to the bottom of the desulfurization tower. A differential pressure gauge is installed on the differential pressure pipeline.

13. The flue gas solid desulfurization device according to any one of claims 1-7, characterized in that, It also includes a discharge port, which is located on the side wall of the desulfurization tower.

14. The flue gas solid desulfurization device according to claim 13, characterized in that, The distance between the lower edge of the discharge port and the support grid plate is 100mm-300mm.

15. The flue gas solid desulfurization device according to any one of claims 1-7, characterized in that, It also includes a sewage discharge pipeline, which is connected to the bottom of the desulfurization tower, and a shut-off valve is installed on the sewage discharge pipeline.

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