Double-effect recovery and comprehensive utilization device for ammonia and sulfur tail gas of crude benzene hydrogenation device

Abstract

The invention belongs to the technical field of tail gas recovery and utilization, and particularly relates to a crude benzene hydrogenation device ammonia-sulfur tail gas double-effect recovery and comprehensive utilization device which comprises a first base, an ammonia washing tank, a second base, a desulfurizer and the like. The first base and the second base are arranged side by side and serve as a mounting carrier of the device, an ammonia washing tank is mounted on the first base, water for dissolving ammonia gas is arranged in the ammonia washing tank, two openings are formed in the lower part of the ammonia washing tank, one opening is a waste gas inlet for introducing ammonia-sulfur tail gas, and the other opening is an ammonia water outlet. Through combination of the ammonia washing tank, the desulfurizer and the boiler room, ammonia and hydrogen sulfide in tail gas are gradually removed, ammonia water generated by the ammonia washing tank is fed into the boiler room for denitration, ammonia gas emission is reduced, a reducing agent needed by denitration is provided for the boiler room, and the boiler room can be recycled. And the sodium hydrosulfide solution generated in the desulfurization process can be sold as a commodity, so that the economic benefit is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of tail gas recovery and utilization, and specifically relates to a dual-effect recovery and comprehensive utilization device for ammonia and sulfur tail gas from a crude benzene hydrogenation unit. Background Art

[0002] In the chemical industry, the crude benzene hydrogenation unit is an important equipment used in the petrochemical industry to improve the quality of crude benzene. Through hydrogenation treatment, the unsaturated compounds (such as dienes, olefins, etc.) in the crude benzene are converted into saturated compounds, and at the same time, impurities such as sulfur and nitrogen in the crude benzene are removed, thereby obtaining a purer benzene product to improve the quality and stability of the product. However, in this process, tail gas containing ammonia, sulfide and other impurities will be generated. If these waste gases are directly discharged, they will not only cause environmental pollution, but also waste recyclable resources.

[0003] In order to achieve the goals of environmental protection and efficient utilization of resources, it is necessary to provide a dual-effect recovery and comprehensive utilization device for ammonia sulfur tail gas from a crude benzene hydrogenation unit to solve the defects of difficult treatment and low recovery and utilization rate of ammonia sulfur tail gas produced by a crude benzene hydrogenation unit. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a dual-effect recovery and comprehensive utilization device for ammonia and sulfur tail gas from a crude benzene hydrogenation unit.

[0005] The technical scheme of the present invention is: a device for comprehensive utilization of ammonia and sulfur tail gas dual-effect recovery of a crude benzene hydrogenation device, comprising a first base, an ammonia washing tank, a second base, a desulfurizer, a boiler room, a wastewater frame, a reboiler, a liquid pump, a stripping tower and a water storage tank. The first base and the second base are arranged side by side and serve as the installation carrier of the device. An ammonia washing tank is installed on the first base. The ammonia washing tank has water for dissolving ammonia gas inside. Two openings are arranged at the bottom of the ammonia washing tank, one of which is a waste gas inlet for the ammonia and sulfur tail gas to be introduced, and the other is an ammonia water outlet. A desulfurizer and a boiler room are provided on the second base. The desulfurizer uses alkali liquid to desulfurize the deammonified tail gas and generate usable sodium hydrosulfide. The ammonia water outlet of the ammonia washing tank is connected to the boiler room through a connecting pipe 1, and denitrification is carried out in the boiler room using ammonia water. A deammonified tail gas outlet is provided on the top of the ammonia washing tank. The deammonified tail gas outlet of the ammonia washing tank is connected to the desulfurizer through a connecting pipe 2. The outlet of the desulfurizer is connected to the boiler room through a connecting pipe 3, so that the non-condensable gas after desulfurization and denitrification in the tail gas enters the boiler room as fuel gas. A wastewater frame for collecting decrystallized salt in ammonia sulfur tail gas is installed on the first base, and the wastewater frame is connected to the inlet of the reboiler through the bottom opening. The decrystallized salt in the wastewater frame is injected with water and a certain amount is collected and injected into the reboiler for heating. The lower side of the reboiler is a liquid outlet. A liquid extraction pump and a stripping tower are also respectively arranged on the first base. The lower part of the stripping tower is provided with a steam inlet for high-temperature steam. The top of the stripping tower is connected to the air inlet at the top of the ammonia washing tank through a connecting pipe 4. The liquid outlet of the reboiler and the inlet of the liquid extraction pump are connected to the inlet of the ammonia washing tank. The outlet of the stripping tower is connected through a connecting pipe five, and the outlet of the liquid pump is connected to the upper part of the stripping tower through a connecting pipe six. The decrystallized salt wastewater heated by the reboiler is pumped into the stripping tower through the liquid pump. The stripping tower uses high-temperature steam to evaporate and precipitate the ammonia and hydrogen sulfide dissolved in the decrystallized salt wastewater. The precipitated ammonia and hydrogen sulfide flow back to the ammonia washing tank from the top of the stripping tower for subsequent deamination and desulfurization. A water storage tank is provided at the bottom of the first base, and the bottom of the stripping tower is connected to the water storage tank through a recovery pipe. The water storage tank is used to collect clean water after deamination and desulfurization in the stripping tower.

[0006] As a further preferred embodiment, the opening at the bottom of the wastewater frame is provided with a solenoid valve, which is used to control the opening and closing of the pipeline connecting the wastewater frame to the reboiler, so that a certain amount of decrystallized salt wastewater collected in the wastewater frame is injected into the reboiler for heating.

[0007] As a further preferred solution, a water pump is installed on the second base, a water pumping pipe is connected between the water inlet of the water pump and the water storage tank, and a water supply pipe is connected between the water outlet of the water pump and the boiler room. The clean water collected in the water storage tank is pumped into the boiler room for water replenishment by the water pump, thereby saving water in the boiler room and reducing costs.

[0008] As a further preferred embodiment, the desulfurizer consists of liquid alkali kettle one, liquid alkali kettle two and liquid alkali kettle three, the connecting pipe two is connected in series with the liquid alkali kettle one, liquid alkali kettle two and liquid alkali kettle three in sequence, the alkali concentration inside the liquid alkali kettle one, liquid alkali kettle two and liquid alkali kettle three gradually increases, and through the three-stage design of liquid alkali kettle one, liquid alkali kettle two and liquid alkali kettle three, the hydrogen sulfide in the tail gas after deamination is gradually reacted and the reaction temperature and pressure are better controlled, while the purity of the sodium hydrosulfide solution generated by the reaction of alkali solution and hydrogen sulfide is improved, the quality of the sodium hydrosulfide solution sold as a commodity is improved, and economic income is increased.

[0009] As a further preferred embodiment, the lower parts of the liquid alkali kettle one, the liquid alkali kettle two and the liquid alkali kettle three are all provided with sodium hydrosulfide outlet valves, and the sodium hydrosulfide solutions generated by the reaction of the liquid alkali kettle one, the liquid alkali kettle two and the liquid alkali kettle three are discharged in batches by opening the sodium hydrosulfide outlet valves, and the sodium hydrosulfide solutions of different purities are collected respectively, so as to facilitate the subsequent processing of the sodium hydrosulfide solutions into sales products.

[0010] As a further preferred embodiment, an agitator is provided inside the wastewater frame, and the agitator is used to accelerate the mixing of decrystallized salt in the wastewater frame into decrystallized salt wastewater after water is injected. The agitator includes: a stirring rack, which is provided with two and is obliquely staggeredly installed inside the wastewater frame; a servo motor, which is installed on the outer wall of the wastewater frame, and the output shaft of the servo motor is connected to the rotating shaft of one of the stirring racks; a synchronous belt, which is wound around the rotating shafts of the two stirring racks, and the two stirring racks are synchronously driven to rotate by the servo motor and the synchronous belt, thereby accelerating the mixing of decrystallized salt and water in the wastewater frame.

[0011] As a further preferred solution, a filter element is installed on the inner wall of the recovery pipe near the water storage tank. The filter element can be easily disassembled and assembled in the recovery pipe. The filter element is used to filter the clean water that flows down into the recovery pipe after deamination and desulfurization in the stripping tower, thereby improving the cleanliness of the water collected in the water storage tank.

[0012] As a further preferred solution, the recovery pipe and the water storage tank are connected via a card interface, and the recovery pipe can be easily disassembled and installed on the water storage tank, which facilitates cleaning and maintenance of the filter element in the recovery pipe.

[0013] The present invention has the following advantages:

[0014] 1. The present invention gradually removes ammonia and hydrogen sulfide in the tail gas through the combination of an ammonia washing tank, a desulfurizer (including three liquid alkali kettles) and a boiler room. The ammonia water produced by the ammonia washing tank is sent to the boiler room for denitrification, which not only reduces ammonia emissions but also provides the boiler room with a reducing agent required for denitrification. In addition, the sodium hydrosulfide solution produced during the desulfurization process can be sold as a commodity to increase economic benefits.

[0015] 2. The present invention can process the decrystallized salt of the crude benzene hydrogenation device through a reboiler and a stripping tower, so that part of the ammonia and hydrogen sulfide dissolved in the decrystallized salt wastewater is precipitated into the ammonia washing tank for recycling. At the same time, the clean water in the stripping tower can be collected in a water storage tank, and the clean water in the water storage tank is continuously pumped into the boiler room for water replenishment through a water pump, thereby saving water resources and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 This is a connection diagram of the ammonia washing tank, desulfurizer and boiler room of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the ammonia washing tank of the present invention.

[0019] Figure 4 This is a connection diagram of the components of the ammonia washing tank, wastewater frame, reboiler and stripping tower of the present invention.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the wastewater frame, reboiler and agitator of the present invention.

[0021] Figure 6 This is a connection diagram of the components such as the ammonia washing tank, boiler room, stripping tower and water storage tank of the present invention.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the water storage tank, recovery pipe, filter element and card interface of the present invention.

[0023] Among them: 1-first base, 2-ammonia washing tank, 201-waste gas inlet, 202-ammonia outlet, 203-connecting pipe 1, 204-deamination tail gas outlet, 205-connecting pipe 2, 206-air inlet, 3-second base, 4-desulfurizer, 401-liquid alkali kettle 1, 402-liquid alkali kettle 2, 403-liquid alkali kettle 3, 404-connecting pipe 3, 405-sodium hydrosulfide outlet valve, 5-boiler room, 6-wastewater frame, 601-electric Magnetic valve, 7-reboiler, 701-liquid outlet, 8-stripping tower, 801-connecting pipe four, 802-steam inlet, 803-recovery pipe, 9-liquid pump, 901-connecting pipe five, 902-connecting pipe six, 10-water tank, 101-water pump, 102-water suction pipe, 103-water delivery pipe, 11-agitator, 111-stirring frame, 112-servo motor, 113-synchronous belt, 12-filter element, 121-card interface. DETAILED DESCRIPTION

[0024] The technical solution is further described below in conjunction with specific embodiments. It should be noted that the words indicating directions such as up, down, left, and right mentioned in this article are only for the position of the structure shown in the corresponding drawings. The serial numbers of the parts in this article, such as first, second, etc., are only used to distinguish the objects described and do not have any order or technical meaning. The words such as connection and coupling in this application include direct and indirect connection (coupling) unless otherwise specified.

[0025] Example 1: A device for comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit, such as Figure 1-Figure 4 and Figure 6 As shown, it includes a first base 1, an ammonia washing tank 2, a second base 3, a desulfurizer 4, a boiler room 5, a wastewater frame 6, a reboiler 7, a liquid pump 9, a stripping tower 8 and a water storage tank 10. The first base 1 and the second base 3 are arranged side by side and serve as the installation carrier of the device. The ammonia washing tank 2 is installed on the first base 1. The ammonia washing tank 2 has water for dissolving ammonia gas. The lower part of the ammonia washing tank 2 is provided with two openings, one of which is a waste gas inlet 201 for the introduction of ammonia sulfur tail gas, and the other is an ammonia water outlet 202. The second base 3 is provided with a desulfurizer 4 and a boiler room 5. The desulfurizer 4 is used to The deammoniation tail gas is desulfurized with alkali solution and usable sodium hydrosulfide is generated. The ammonia water outlet 202 of the ammonia washing tank 2 is connected to the boiler room 5 through the connecting pipe 1 203. The ammonia water is used to denitrate in the boiler room 5. The top of the ammonia washing tank 2 is provided with a deammoniation tail gas outlet 204. The deammoniation tail gas outlet 204 of the ammonia washing tank 2 is connected to the desulfurizer 4 through the connecting pipe 205. The outlet of the desulfurizer 4 is connected to the boiler room 5 through the connecting pipe 3 404, so that the non-condensable gas after desulfurization and denitrification in the tail gas enters the boiler room 5 as fuel gas. The first base 1 is equipped with a device for collecting ammonia sulfur tail gas. The wastewater frame 6 of the decrystallized salt is connected to the inlet of the reboiler 7 through the bottom opening. The decrystallized salt in the wastewater frame 6 is injected with water and a certain amount is collected and injected into the reboiler 7 for heating. The lower side of the reboiler 7 is a liquid outlet 701. The first base 1 is also provided with a liquid extraction pump 9 and a stripping tower 8. The lower part of the stripping tower 8 is provided with a steam inlet 802 for high-temperature steam. The top of the stripping tower 8 is connected to the air inlet 206 at the top of the ammonia washing tank 2 through a connecting pipe 901. The liquid outlet 701 of the reboiler 7 and the inlet of the liquid extraction pump 9 are connected through a connecting pipe 905. 1 is connected, the outlet of the liquid pump 9 is connected to the upper part of the stripping tower 8 through the connecting pipe 6 902, the decrystallized salt waste water heated by the reboiler 7 is pumped into the stripping tower 8 through the liquid pump 9, the stripping tower 8 uses high-temperature steam to evaporate and precipitate the ammonia and hydrogen sulfide dissolved in the decrystallized salt waste water, and the precipitated ammonia and hydrogen sulfide flow back from the top of the stripping tower 8 to the ammonia washing tank 2 for subsequent deamination and desulfurization. A water storage tank 10 is provided at the bottom of the first base 1, and the bottom of the stripping tower 8 is connected to the water storage tank 10 through the recovery pipe 803. The water storage tank 10 is used to collect the clean water after deamination and desulfurization in the stripping tower 8.

[0026] like Figure 1 and Figure 2 As shown, the desulfurizer 4 is composed of a liquid alkali kettle 1 401, a liquid alkali kettle 2 402 and a liquid alkali kettle 3 403. The connecting pipe 205 is connected in series with the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 in sequence. The liquid alkali kettle 3 403 is connected to the boiler room 5 through the connecting pipe 3 404. The concentration of the alkali solution inside the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 gradually increases. Through the three-stage design of the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403, the hydrogen sulfide in the tail gas after deamination is gradually reacted and the reaction temperature is better controlled. and pressure, while improving the purity of the sodium hydrosulfide solution generated by the reaction of alkali solution and hydrogen sulfide, improving the quality of the sodium hydrosulfide solution sold as a commodity, and increasing economic income; the lower parts of the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 are all provided with a sodium hydrosulfide outlet valve 405, and the sodium hydrosulfide solution generated by the reaction of the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 is discharged in batches by opening the sodium hydrosulfide outlet valve 405, and the sodium hydrosulfide solutions of different purities are collected respectively, so as to facilitate the subsequent processing of the sodium hydrosulfide solution into sales products.

[0027] When the device is used to recycle the ammonia sulfur tail gas produced by the crude benzene hydrogenation device, the hydrogen sulfide, ammonia and alkane non-condensable gas mixture produced by desulfurization and denitrification enters the ammonia washing tank 2 through the waste gas inlet 201 as the device tail gas, and the ammonia in the ammonia sulfur tail gas is dissolved by the water in the ammonia washing tank 2 to form ammonia water. The ammonia water formed in the ammonia washing tank 2 flows into the connecting pipe 1 203 through the ammonia water outlet 202, and the ammonia water in the connecting pipe 1 203 flows into the boiler room 5 to provide the reducing agent required for denitrification. The tail gas after deammoniation will be discharged from the deammoniation tail gas outlet 204 on the upper part of the ammonia washing tank 2 into the connecting pipe 2 205, and the tail gas after deammoniation is passed from the connecting pipe 2 205 to the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 in series in turn, and passes through the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403. The alkali solution in the tail gas after deamination reacts with the hydrogen sulfide, removes the hydrogen sulfide component in the tail gas, and generates a sodium hydrosulfide solution. This process adopts a three-stage liquid alkali kettle design, gradually increases the alkali concentration to ensure that the hydrogen sulfide can fully react, and can control the reaction conditions to optimize the purity of the sodium hydrosulfide solution product. After opening the sodium hydrosulfide outlet valve 405, the sodium hydrosulfide solutions in the liquid alkali kettle 1 401, the liquid alkali kettle 2 402 and the liquid alkali kettle 3 403 are sold as commodities, thereby increasing economic income. After the hydrogen sulfide in the tail gas is removed, it becomes a non-condensable gas for desulfurization and denitrification, and is discharged from the outlet of the liquid alkali kettle 3 403 into the connecting pipe 3 404. Finally, the non-condensable gas is discharged from the connecting pipe 3 404 into the boiler room 5 and is recycled as fuel gas, while reducing the use of boiler coal, achieving the effect of saving fuel costs.

[0028] Embodiment 2: Based on embodiment 1, Figure 4 and Figure 6 As shown, the opening at the bottom of the wastewater frame 6 is provided with a solenoid valve 601, and the solenoid valve 601 is used to control the opening and closing of the pipeline connecting the wastewater frame 6 to the reboiler 7, so that a certain amount of decrystallized salt wastewater collected in the wastewater frame 6 is injected into the reboiler 7 for heating; a water pump 101 is installed on the second base 3, and a pumping pipe 102 is connected between the water inlet of the water pump 101 and the water storage tank 10, and a water delivery pipe 103 is connected between the water outlet of the water pump 101 and the boiler room 5. The clean water collected in the water storage tank 10 is pumped into the boiler room 5 for water replenishment through the water pump 101, which saves water in the boiler room 5 and reduces costs.

[0029] like Figure 4 and Figure 5 As shown, an agitator 11 is arranged inside the wastewater frame 6, and the agitator 11 is used to speed up the mixing of the decrystallized salt in the wastewater frame 6 into decrystallized salt wastewater after water is injected. The agitator 11 includes: a stirring frame 111, which is provided with two and is obliquely staggeredly installed inside the wastewater frame 6, and the obliquely staggered agitators 111 can produce more complex fluid movement and break the flow pattern in a single direction, so that the decrystallized salt and water can be more fully mixed in different directions; a servo motor 112, which is installed on the outer wall of the wastewater frame 6, and the output shaft of the servo motor 112 is connected to the rotating shaft of one of the stirring frames 111; a synchronous belt 113, which is wound around the rotating shafts of the two stirring frames 111, and the servo motor 112 cooperates with the synchronous belt 113 to synchronously drive the two stirring frames 111 to rotate, thereby accelerating the mixing of the decrystallized salt and water in the wastewater frame 6.

[0030] like Figure 7 As shown, a filter element 12 is installed on the inner wall of the recovery pipe 803 near the water tank 10. The filter element 12 can be easily disassembled and assembled in the recovery pipe 803. The filter element 12 is used to filter the clean water that flows down into the recovery pipe 803 after deammoniation and desulfurization in the stripping tower 8, thereby improving the cleanliness of the water collected in the water tank 10. The recovery pipe 803 and the water tank 10 are connected via a card interface 121. The recovery pipe 803 can be easily disassembled and assembled on the water tank 10, which is convenient for cleaning and maintenance of the filter element 12 in the recovery pipe 803.

[0031] At the same time, the decrystallized salt from the crude benzene hydrogenation unit enters the wastewater frame 6 for collection, and water is added to the decrystallized salt in the wastewater frame 6 to form decrystallized salt waste liquid. In order to speed up the mixing efficiency of the decrystallized salt and water, the servo motor 112 is enabled, and the output shaft of the servo motor 112 drives one of the stirring racks 111 to rotate. Under the action of the synchronous belt 113, the two stirring racks 111 are synchronously staggered in the wastewater frame 6, and the decrystallized salt waste liquid is fully stirred and mixed. When the decrystallized salt waste water accumulates to a certain amount in the wastewater frame 6, the solenoid valve 601 is used to control the injection of the waste water into the reboiler 7 for heating, and then the liquid pump 9 is enabled to pump the heated decrystallized salt waste liquid from the reboiler 7 into the connecting pipe five 901, and the decrystallized salt waste liquid heated in the connecting pipe five 901 is pumped from the connecting pipe six 902 into the stripping tower 8. At the upper part, high-temperature steam is introduced into the steam inlet 802 in the stripping tower 8 at this time. The high-temperature steam introduced into the stripping tower 8 will strip the heated decrystallized salt waste liquid, so that the ammonia and hydrogen sulfide dissolved in the decrystallized salt waste liquid are evaporated and precipitated from the connecting pipe four 801 at the top of the stripping tower 8. The precipitated ammonia and hydrogen sulfide flow through the connecting pipe four 801 and enter the ammonia washing tank 2 from the air inlet 206, so that the ammonia and hydrogen sulfide are deaminated and desulfurized in the subsequent ammonia washing tank 2 and the desulfurizer 4. The bottom of the stripping tower 8 will gradually collect the clean water after deammoniation and desulfurization, and the clean water will flow into the water storage tank 10 for storage after filtering through the filter element 12 in the recovery pipe 803. Finally, the clean water collected in the water storage tank 10 is pumped into the pumping pipe 102 by the water pump 101. Finally, the clean water will flow back to the boiler room 5 from the water supply pipe 103 for water replenishment or other purposes in the boiler room 5.

[0032] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit, characterized in that: The invention comprises a first base (1), an ammonia washing tank (2), a second base (3), a desulfurizer (4), a boiler room (5), a wastewater frame (6), a reboiler (7), a liquid extraction pump (9), a stripping tower (8) and a water storage tank (10). The first base (1) is provided with an ammonia washing tank (2). The lower part of the ammonia washing tank (2) is provided with two openings, one of which is a waste gas inlet (201) for the introduction of ammonia sulfur tail gas, and the other is an ammonia water outlet (202). The second base (3) is provided with A desulfurizer (4) and a boiler room (5) are provided. The desulfurizer (4) uses alkali solution to desulfurize the deammoniation tail gas and generate usable sodium hydrosulfide. The ammonia water outlet (202) of the ammonia washing tank (2) is connected to the boiler room (5) through a connecting pipe 1 (203). The top of the ammonia washing tank (2) is provided with a deammoniation tail gas outlet (204). The deammoniation tail gas outlet (204) of the ammonia washing tank (2) is connected to the desulfurizer (4) through a connecting pipe 2 (205). The desulfurizer (4) The outlet of the steam stripping tower (8) is connected to the boiler room (5) through a connecting pipe (404). A wastewater frame (6) is installed on the first base (1). The wastewater frame (6) is connected to the inlet of the reboiler (7) through a bottom opening. The lower side of the reboiler (7) is a liquid outlet (701). The first base (1) is also provided with a liquid pump (9) and a stripping tower (8). The lower part of the stripping tower (8) is provided with a steam inlet (802). The top of the stripping tower (8) is connected to the steam stripping tower (8). The connecting pipe 4 (801) is connected to the air inlet (206) at the top of the ammonia washing tank (2); the liquid outlet (701) of the reboiler (7) and the inlet of the liquid pump (9) are connected via the connecting pipe 5 (901); the outlet of the liquid pump (9) is connected to the upper part of the stripping tower (8) via the connecting pipe 6 (902); a water storage tank (10) is provided at the bottom of the first base (1); and the bottom of the stripping tower (8) is connected to the water storage tank (10) via the recovery pipe (803).

2. The device for dual-effect recovery and comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit as claimed in claim 1, characterized in that: The opening at the bottom of the wastewater frame (6) is provided with a solenoid valve (601), and the solenoid valve (601) is used to control the opening and closing of the pipeline connecting the wastewater frame (6) to the reboiler (7).

3. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit according to claim 2, characterized in that: A water pump (101) is installed on the second base (3); a water pumping pipe (102) is connected between the water inlet of the water pump (101) and the water storage tank (10); and a water delivery pipe (103) is connected between the water outlet of the water pump (101) and the boiler room (5).

4. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit according to claim 3, characterized in that: The desulfurizer (4) is composed of a liquid alkali kettle one (401), a liquid alkali kettle two (402) and a liquid alkali kettle three (403), and the connecting pipe two (205) is connected in series with the liquid alkali kettle one (401), the liquid alkali kettle two (402) and the liquid alkali kettle three (403) in sequence.

5. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit according to claim 4, characterized in that: The lower parts of the liquid caustic soda kettle 1 (401), the liquid caustic soda kettle 2 (402) and the liquid caustic soda kettle 3 (403) are all provided with a sodium hydrosulfide outlet valve (405).

6. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit according to claim 5, characterized in that: The wastewater frame (6) is provided with an agitator (11) inside, and the agitator (11) comprises: A stirring rack (111), comprising two stirring racks (111) which are installed in an inclined and staggered manner inside the wastewater frame (6); A servo motor (112) is mounted on the outer wall of the wastewater frame (6), and an output shaft of the servo motor (112) is connected to a rotating shaft of one of the stirring racks (111); The synchronous belt (113) is wound around the rotating shafts of the two stirring racks (111).

7. A device for the comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit according to claim 6, characterized in that: A filter element (12) is installed on the inner wall of the recovery pipe (803) close to the water storage tank (10), and the filter element (12) can be easily disassembled and assembled in the recovery pipe (803).

8. The device for dual-effect recovery and comprehensive utilization of ammonia and sulfur tail gas from a crude benzene hydrogenation unit as claimed in claim 7, characterized in that: The recovery pipe (803) and the water storage tank (10) are connected by a card interface (121), and the recovery pipe (803) can be easily disassembled and installed on the water storage tank (10).

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