Tail gas treatment device

Abstract

The utility model provides a tail gas treatment device which comprises a deacidification device, a tail gas incinerator and a desulfurization and denitrification tower, and the deacidification device is used for treating tail gas so as to convert hydrogen sulfide and oxysulfide in the tail gas into elemental sulfur to be separated out; the deacidification device is communicated with the tail gas incinerator, and the tail gas incinerator incinerates the tail gas treated by the deacidification device so that hydrogen sulfide and hydrogen in the tail gas can be completely combusted; and the desulfurization and denitrification tower is communicated with the tail gas incinerator and is used for treating sulfur oxides and nitrogen oxides in tail gas output by the tail gas incinerator. The deacidification device preliminarily removes sulfides in the tail gas; the tail gas incinerator completely combusts hydrogen sulfide and hydrogen in the tail gas to obtain sulfur oxide and water; and the desulfurization and denitrification tower is used for treating sulfur oxides and nitrogen oxides in the tail gas. Through multi-stage treatment of the deacidification device, the tail gas incinerator and the desulfurization and denitrification tower, sulfides and nitrogen oxides in the tail gas are effectively removed, and pollution of the tail gas to the environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sulfur recovery, in particular to a tail gas treatment device. Background Art

[0002] Sulfides and nitrogen oxides are extremely harmful in the chemical processing process, corroding equipment, affecting the long-term operation of the device, and also easily affecting product quality and causing environmental pollution. Therefore, the tail gas generated during the operation of the factory needs to be treated to remove the sulfides and nitrogen oxides in the tail gas. The tail gas treatment device in the prior art is not stable enough to remove sulfides and nitrogen oxides, and cannot effectively remove sulfides and nitrogen oxides, which will cause environmental pollution.

[0003] Therefore, there is a need for a tail gas treatment device that can effectively remove sulfides and nitrogen oxides in tail gas. Utility Model Content

[0004] The utility model provides a tail gas treatment device to solve the problem that the tail gas treatment device in the prior art cannot effectively remove sulfides and nitrogen oxides.

[0005] In order to solve the above problems, the utility model provides an exhaust gas treatment device, comprising:

[0006] A deacidification device, which treats the tail gas to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation;

[0007] The tail gas incinerator is connected to the deacidification device, and the tail gas incinerator incinerates the tail gas treated by the deacidification device to completely burn the hydrogen sulfide and hydrogen in the tail gas;

[0008] The desulfurization and denitrification tower is connected to the tail gas incinerator, and the desulfurization and denitrification tower processes the sulfur oxides and nitrogen oxides in the tail gas output by the tail gas incinerator.

[0009] Furthermore, the deacidification device includes a sulfur-making furnace and a supply device, which is connected to the sulfur-making furnace. The supply device supplies oxygen-enriched air to the sulfur-making furnace. The sulfur-making furnace heats the mixture of exhaust gas and oxygen-enriched air to convert hydrogen sulfide in the exhaust gas into elemental sulfur.

[0010] Furthermore, the deacidification device also includes a catalytic reactor. The tail gas output by the sulfur-making furnace enters the catalytic reactor. The catalyst in the catalytic reactor reacts with the tail gas output by the sulfur-making furnace to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur.

[0011] Furthermore, the deacidification device also includes a primary cooler and a secondary cooler. The primary cooler cools the tail gas output from the sulfur-making furnace to liquefy and precipitate the elemental sulfur, and the secondary cooler cools the tail gas output from the catalytic reactor to liquefy and precipitate the elemental sulfur.

[0012] Furthermore, the deacidification device also includes a liquid sulfur pool, which is used to store liquid elemental sulfur precipitated by cooling the tail gas by the primary cooler and the secondary cooler.

[0013] Furthermore, the exhaust gas treatment device also includes a gas-liquid separation tank, the inlet of the gas-liquid separation tank is connected to the outlet of the deacidification device, the gas-liquid separation tank separates the liquid elemental sulfur remaining in the exhaust gas output by the deacidification device, the gas outlet of the gas-liquid separation tank is connected to the inlet of the exhaust gas incinerator, and the liquid outlet of the gas-liquid separation tank outputs elemental sulfur.

[0014] Furthermore, the inlet of the desulfurization and denitrification tower is arranged at the bottom of the desulfurization and denitrification tower, and the exhaust gas rises in the desulfurization and denitrification tower. The desulfurization and denitrification tower includes an upper tower and a lower tower. The lower tower is used to treat the sulfur oxides in the exhaust gas. The exhaust gas treated by the lower tower rises to the upper tower, and the upper tower is used to treat the nitrogen oxides in the exhaust gas.

[0015] Furthermore, the lower tower includes a lower shell and multiple ammonia water nozzles, the multiple ammonia water nozzles are arranged in the lower shell, the multiple ammonia water nozzles are distributed along the height direction of the lower shell, and the multiple ammonia water nozzles spray the exhaust gas in the lower shell to treat the sulfur oxides in the exhaust gas.

[0016] Furthermore, the tail gas treatment device also includes an ammonia water storage tank, and a plurality of ammonia water nozzles are connected to the ammonia water storage tank, and the ammonia water storage tank supplies ammonia water to the ammonia water nozzles.

[0017] Furthermore, the upper tower includes an upper outer shell and a plurality of denitrification liquid nozzles, the plurality of denitrification liquid nozzles are arranged in the upper outer shell, the plurality of denitrification liquid nozzles are distributed along the height direction of the upper outer shell, and the plurality of denitrification liquid nozzles spray the exhaust gas in the upper outer shell to treat the nitrogen oxides in the exhaust gas.

[0018] Furthermore, the tail gas treatment device also includes a denitrification liquid storage tank, a plurality of denitrification liquid nozzles are connected to the denitrification liquid storage tank, and the denitrification liquid storage tank supplies denitrification liquid to the denitrification liquid nozzles.

[0019] Furthermore, the exhaust gas treatment device also includes a gas detection device and a flare. The gas detection device detects the exhaust gas output by the desulfurization and denitrification tower. When the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower meet the requirements, the exhaust gas output by the desulfurization and denitrification tower is transported to the flare for combustion; when the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower do not meet the requirements, the exhaust gas output by the desulfurization and denitrification tower is transported to the deacidification device.

[0020] The technical scheme of the utility model is applied to provide a tail gas treatment device, including a deacidification device, a tail gas incinerator and a desulfurization and denitrification tower. The deacidification device treats the tail gas to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation; the deacidification device is connected to the tail gas incinerator, and the tail gas incinerator incinerates the tail gas treated by the deacidification device to completely burn the hydrogen sulfide and hydrogen in the tail gas; the desulfurization and denitrification tower is connected to the tail gas incinerator, and the desulfurization and denitrification tower treats the sulfur oxides and nitrogen oxides in the tail gas output by the tail gas incinerator. According to this scheme, the deacidification device converts the hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation, and preliminarily removes the sulfide in the tail gas; the tail gas treated by the deacidification device enters the tail gas incinerator, and the tail gas incinerator completely burns the hydrogen sulfide and hydrogen in the tail gas to obtain sulfur oxides and water; the tail gas treated by the tail gas incinerator enters the desulfurization and denitrification tower, and the desulfurization and denitrification tower treats the sulfur oxides and nitrogen oxides in the tail gas. Through multi-stage treatment including deacidification device, tail gas incinerator and desulfurization and denitrification tower, the sulfide and nitrogen oxide in the tail gas can be effectively removed, thus avoiding the pollution of the environment by the tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 The schematic diagram of the structure of the tail gas treatment device provided by the embodiment of the utility model is shown;

[0023] Figure 2 Shows Figure 1 Schematic diagram of the structure of the desulfurization and denitrification tower of the tail gas treatment device.

[0024] The above drawings include the following reference numerals:

[0025] 10. Deacidification device;

[0026] 11. Sulfur making furnace;

[0027] 12. Primary cooler;

[0028] 13. Catalytic reactor;

[0029] 14. Secondary cooler;

[0030] 20. Tail gas incinerator;

[0031] 30. Desulfurization and denitrification tower;

[0032] 31. Upper tower;

[0033] 32. Lower tower;

[0034] 40. Gas-liquid separation tank;

[0035] 50. Ammonia storage tank;

[0036] 60. Nitrogen removal liquid storage tank;

[0037] 70. Torch. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0039] like Figure 1 to Figure 2 As shown, an embodiment of the utility model provides a tail gas treatment device, including a deacidification device 10, a tail gas incinerator 20 and a desulfurization and denitrification tower 30. The deacidification device 10 treats the tail gas to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation; the deacidification device 10 is connected to the tail gas incinerator 20, and the tail gas incinerator 20 incinerates the tail gas treated by the deacidification device 10 to completely burn the hydrogen sulfide and hydrogen in the tail gas; the desulfurization and denitrification tower 30 is connected to the tail gas incinerator 20, and the desulfurization and denitrification tower 30 treats the sulfur oxides and nitrogen oxides in the tail gas output by the tail gas incinerator 20.

[0040] According to this solution, the deacidification device 10 converts hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation, and preliminarily removes sulfides in the tail gas; the tail gas treated by the deacidification device 10 enters the tail gas incinerator 20, and the tail gas incinerator 20 completely burns the hydrogen sulfide and hydrogen in the tail gas to obtain sulfur oxides and water; the tail gas treated by the tail gas incinerator 20 enters the desulfurization and denitration tower 30, and the desulfurization and denitration tower 30 treats the sulfur oxides and nitrogen oxides in the tail gas. Through the multi-stage treatment of the deacidification device 10, the tail gas incinerator 20 and the desulfurization and denitration tower 30, the sulfides and nitrogen oxides in the tail gas are effectively removed, and the tail gas is prevented from polluting the environment.

[0041] like Figure 1 As shown, the deacidification device 10 includes a sulfur-making furnace 11 and a supply device, which is connected to the sulfur-making furnace 11 and supplies oxygen-enriched air to the sulfur-making furnace 11. The sulfur-making furnace 11 heats the mixture of exhaust gas and oxygen-enriched air to convert hydrogen sulfide in the exhaust gas into elemental sulfur.

[0042] With such arrangement, the supply device supplies oxygen-enriched air to the sulfur-making furnace, and the oxygen-enriched air and the tail gas are mixed and reacted in the sulfur-making furnace 11 to convert hydrogen sulfide in the tail gas into elemental sulfur.

[0043] In a specific embodiment of the present invention, 65%-75% of the exhaust gas enters the furnace of the sulfur-making furnace 11 from the main burner of the sulfur-making furnace 11, and 25%-35% of the exhaust gas is introduced into the furnace of the sulfur-making furnace 11 from the side of the sulfur-making furnace 11, and reacts with the oxygen-rich air in the furnace of the sulfur-making furnace 11. The temperature in the furnace of the sulfur-making furnace 11 is greater than or equal to 1250°C.

[0044] like Figure 1 As shown, the deacidification device 10 further includes a catalytic reactor 13. The tail gas outputted by the sulfur-making furnace 11 enters the catalytic reactor 13. The catalyst in the catalytic reactor 13 reacts with the tail gas outputted by the sulfur-making furnace 11 to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur.

[0045] With such arrangement, the tail gas treated by the sulfur-making furnace 11 enters the catalytic reactor 13, and the catalyst in the catalytic reactor 13 treats the hydrogen sulfide and sulfur oxides in the tail gas, and converts the hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur.

[0046] like Figure 1 As shown, the deacidification device 10 also includes a primary cooler 12 and a secondary cooler 14. The primary cooler 12 cools the tail gas output from the sulfur-making furnace 11 to liquefy and precipitate the elemental sulfur, and the secondary cooler 14 cools the tail gas output from the catalytic reactor 13 to liquefy and precipitate the elemental sulfur.

[0047] In this way, the primary cooler 12 cools the tail gas outputted from the sulfur-making furnace 11 to liquefy and precipitate the elemental sulfur, thereby separating the elemental sulfur in the tail gas and preventing sulfur from polluting the environment. The secondary cooler 14 cools the tail gas outputted from the catalytic reactor 13 to liquefy and precipitate the elemental sulfur, thereby separating the elemental sulfur in the tail gas and preventing sulfur from polluting the environment.

[0048] Furthermore, the deacidification device 10 also includes a liquid sulfur pool, which is used to store liquid elemental sulfur precipitated by the primary cooler 12 and the secondary cooler 14 when cooling the tail gas.

[0049] With this arrangement, the liquid sulfur pool stores liquid elemental sulfur to prevent sulfur leakage and environmental pollution.

[0050] like Figure 1 As shown, the tail gas treatment device also includes a gas-liquid separation tank 40, the inlet of the gas-liquid separation tank 40 is connected to the outlet of the deacidification device 10, the gas-liquid separation tank 40 separates the liquid elemental sulfur remaining in the tail gas output by the deacidification device 10, the gas outlet of the gas-liquid separation tank 40 is connected to the inlet of the tail gas incinerator 20, and the liquid outlet of the gas-liquid separation tank 40 outputs elemental sulfur.

[0051] In this configuration, the gas-liquid separation tank 40 separates the residual liquid sulfur in the tail gas, and the tail gas with separated liquid sulfur enters the tail gas incinerator 20 for full combustion. The residual liquid sulfur in the separated tail gas enters the liquid sulfur pool for storage after being processed.

[0052] like Figure 2 As shown, the inlet of the desulfurization and denitrification tower 30 is arranged at the bottom of the desulfurization and denitrification tower 30, and the exhaust gas rises in the desulfurization and denitrification tower 30. The desulfurization and denitrification tower 30 includes an upper tower 31 and a lower tower 32. The lower tower 32 is used to treat the sulfur oxides in the exhaust gas. The exhaust gas treated by the lower tower 32 rises to the upper tower 31, and the upper tower 31 is used to treat the nitrogen oxides in the exhaust gas.

[0053] With such arrangement, the exhaust gas rises in the desulfurization and denitrification tower 30, and passes through the lower tower 32 and the upper tower 31 in sequence. The lower tower 32 is used to treat the sulfur oxides in the exhaust gas, and the upper tower 31 is used to treat the nitrogen oxides in the exhaust gas, so that the desulfurization and denitrification tower 30 can fully treat the sulfur oxides and nitrogen oxides in the exhaust gas.

[0054] Furthermore, the lower tower 32 includes a lower shell and a plurality of ammonia water nozzles, the plurality of ammonia water nozzles are arranged in the lower shell, the plurality of ammonia water nozzles are distributed along the height direction of the lower shell, and the plurality of ammonia water nozzles spray the exhaust gas in the lower shell to treat the sulfur oxides in the exhaust gas.

[0055] With such arrangement, the tail gas enters the interior of the lower shell from the bottom of the desulfurization and denitration tower 30, and the tail gas gradually rises in the lower shell. The multi-layer ammonia water nozzles spray the tail gas in multiple layers, so that the sulfur oxides in the tail gas react fully.

[0056] like Figure 2 As shown, the exhaust gas treatment device further includes an ammonia water storage tank 50, and a plurality of ammonia water nozzles are connected to the ammonia water storage tank 50, and the ammonia water storage tank 50 supplies ammonia water to the ammonia water nozzles.

[0057] With such arrangement, the ammonia water storage tank 50 supplies ammonia water to the ammonia water spray heads to perform multi-layer spraying on the exhaust gas.

[0058] In a specific embodiment of the present invention, sulfur oxides are removed by washing with ammonia water, and the sulfur-containing ammonia water is treated to produce an ammonium sulfate product, and the separated ammonia water is continuously returned to the ammonia water storage tank 50. In this way, the reaction product of ammonia water and sulfur oxides can be reused, and the incompletely reacted ammonia water can also be reused.

[0059] Furthermore, the upper tower 31 includes an upper outer shell and a plurality of denitrification liquid nozzles, the plurality of denitrification liquid nozzles are arranged in the upper outer shell, the plurality of denitrification liquid nozzles are distributed along the height direction of the upper outer shell, and the plurality of denitrification liquid nozzles spray the exhaust gas in the upper outer shell to treat the nitrogen oxides in the exhaust gas.

[0060] With such arrangement, the tail gas enters the upper tower 31 from the lower tower 32, and the tail gas rises in the upper shell. A plurality of nitrogen removal liquid nozzles spray the tail gas in multiple layers to completely remove nitrogen oxides in the tail gas.

[0061] like Figure 2 As shown, the tail gas treatment device further includes a denitrification liquid storage tank 60, and a plurality of denitrification liquid nozzles are connected to the denitrification liquid storage tank 60, and the denitrification liquid storage tank 60 supplies denitrification liquid to the denitrification liquid nozzles.

[0062] With such arrangement, the denitrifying liquid storage tank 60 supplies denitrifying liquid to the denitrifying liquid nozzle, and performs multi-layer spraying on the tail gas.

[0063] In a specific embodiment of the present invention, the denitrification liquid is mainly composed of a mixture of sodium hydroxide, ethylenediamine heavy metal complexing agent, urea and ammonium chloride. The products of the reaction between the denitrification liquid and nitrogen oxides are mainly sodium carbonate and sodium nitrate. After the denitrification liquid mixture after the reaction is treated, the unreacted denitrification liquid mixture is returned to the denitrification liquid storage tank 60.

[0064] like Figure 2As shown, the exhaust gas treatment device also includes a gas detection device and a flare 70. The gas detection device detects the exhaust gas output by the desulfurization and denitrification tower 30. When the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower 30 meet the requirements, the exhaust gas output by the desulfurization and denitrification tower 30 is transported to the flare 70 for combustion; when the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower 30 do not meet the requirements, the exhaust gas output by the desulfurization and denitrification tower 30 is transported to the deacidification device 10.

[0065] With such a configuration, the gas detection device detects the tail gas outputted from the desulfurization and denitration tower 30 to detect whether the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the tail gas outputted from the desulfurization and denitration tower 30 meet the emission requirements. The tail gas whose contents of hydrogen sulfide, sulfur oxides and nitrogen oxides meet the requirements can be transported to the flare 70 for combustion treatment. The tail gas whose contents of hydrogen sulfide, sulfur oxides and nitrogen oxides do not meet the requirements needs to be sent back to the deacidification device 10 for reprocessing until the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the tail gas meet the requirements before being discharged.

[0066] The advantages of the utility model are:

[0067] 1. The tail gas is treated in three stages by a deacidification device 10, a tail gas incinerator 20 and a desulfurization and denitrification tower 30, so that hydrogen sulfide, sulfur oxides and nitrogen oxides in the tail gas can be effectively removed;

[0068] 2. Use gas detection equipment to detect the treated exhaust gas to ensure that exhaust gas that does not meet the standards cannot be discharged and does not pollute the environment.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0071] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0074] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tail gas treatment device, characterized in that: include: A deacidification device (10), wherein the deacidification device (10) treats the tail gas to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur for precipitation; A tail gas incinerator (20), wherein the deacidification device (10) is connected to the tail gas incinerator (20), and the tail gas incinerator (20) incinerates the tail gas treated by the deacidification device (10) to completely burn the hydrogen sulfide and hydrogen in the tail gas; A desulfurization and denitrification tower (30), wherein the desulfurization and denitrification tower (30) is connected to the tail gas incinerator (20), and the desulfurization and denitrification tower (30) processes sulfur oxides and nitrogen oxides in the tail gas output from the tail gas incinerator (20).

2. The exhaust gas treatment device according to claim 1, characterized in that: The deacidification device (10) comprises a sulfur-making furnace (11) and a supply device, wherein the supply device is connected to the sulfur-making furnace (11) and supplies oxygen-enriched air to the sulfur-making furnace (11). The sulfur-making furnace (11) heats a mixture of exhaust gas and oxygen-enriched air to convert hydrogen sulfide in the exhaust gas into elemental sulfur.

3. The exhaust gas treatment device according to claim 2, characterized in that: The deacidification device (10) further comprises a catalytic reactor (13), the tail gas outputted by the sulfur-making furnace (11) enters the catalytic reactor (13), and the catalyst in the catalytic reactor (13) reacts with the tail gas outputted by the sulfur-making furnace (11) to convert hydrogen sulfide and sulfur oxides in the tail gas into elemental sulfur.

4. The exhaust gas treatment device according to claim 3, characterized in that: The deacidification device (10) further comprises a primary cooler (12) and a secondary cooler (14), wherein the primary cooler (12) cools the tail gas outputted from the sulfur-making furnace (11) to liquefy and precipitate the elemental sulfur, and the secondary cooler (14) cools the tail gas outputted from the catalytic reactor (13) to liquefy and precipitate the elemental sulfur.

5. The exhaust gas treatment device according to claim 4, characterized in that: The deacidification device (10) further comprises a liquid sulfur pool, wherein the liquid sulfur pool is used to store liquid elemental sulfur precipitated by the exhaust gas cooling by the primary cooler (12) and the secondary cooler (14).

6. The exhaust gas treatment device according to claim 4, characterized in that: The tail gas treatment device also includes a gas-liquid separation tank (40), the inlet of the gas-liquid separation tank (40) is connected to the outlet of the deacidification device (10), and the gas-liquid separation tank (40) separates the liquid elemental sulfur remaining in the tail gas output by the deacidification device (10). The gas outlet of the gas-liquid separation tank (40) is connected to the inlet of the tail gas incinerator (20), and the liquid outlet of the gas-liquid separation tank (40) outputs elemental sulfur.

7. The exhaust gas treatment device according to claim 1, characterized in that: The inlet of the desulfurization and denitrification tower (30) is arranged at the bottom of the desulfurization and denitrification tower (30), and the exhaust gas rises in the desulfurization and denitrification tower (30). The desulfurization and denitrification tower (30) comprises an upper tower (31) and a lower tower (32), and the lower tower (32) is used to treat sulfur oxides in the exhaust gas. The exhaust gas treated by the lower tower (32) rises to the upper tower (31), and the upper tower (31) is used to treat nitrogen oxides in the exhaust gas.

8. The exhaust gas treatment device according to claim 7, characterized in that: The lower tower (32) comprises a lower outer shell and a plurality of ammonia water nozzles, wherein the plurality of ammonia water nozzles are arranged in the lower outer shell and distributed along the height direction of the lower outer shell, and the plurality of ammonia water nozzles spray the exhaust gas in the lower outer shell to treat the sulfur oxides in the exhaust gas.

9. The exhaust gas treatment device according to claim 8, characterized in that: The tail gas treatment device further comprises an ammonia water storage tank (50), a plurality of ammonia water nozzles are connected to the ammonia water storage tank (50), and the ammonia water storage tank (50) supplies ammonia water to the ammonia water nozzles.

10. The exhaust gas treatment device according to claim 7, characterized in that: The upper tower (31) comprises an upper outer shell and a plurality of denitrification liquid nozzles, wherein the plurality of denitrification liquid nozzles are arranged in the upper outer shell and distributed along the height direction of the upper outer shell, and the plurality of denitrification liquid nozzles spray the exhaust gas in the upper outer shell to treat the nitrogen oxides in the exhaust gas.

11. The exhaust gas treatment device according to claim 10, characterized in that: The tail gas treatment device further comprises a denitrification liquid storage tank (60), a plurality of denitrification liquid nozzles are connected to the denitrification liquid storage tank (60), and the denitrification liquid storage tank (60) supplies denitrification liquid to the denitrification liquid nozzles.

12. The exhaust gas treatment device according to claim 1, characterized in that: The exhaust gas treatment device also includes a gas detection device and a flare (70). The gas detection device detects the exhaust gas output by the desulfurization and denitrification tower (30). When the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower (30) meet the requirements, the exhaust gas output by the desulfurization and denitrification tower (30) is transported to the flare (70) for combustion; when the contents of hydrogen sulfide, sulfur oxides and nitrogen oxides in the exhaust gas output by the desulfurization and denitrification tower (30) do not meet the requirements, the exhaust gas output by the desulfurization and denitrification tower (30) is transported to the deacidification device (10).

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