Light coal tar odor removal system

Abstract

The application discloses a light coal tar odor removal system, which comprises an odor removal system, wherein the odor removal system comprises a light coal tar buffer tank, a booster pump, a first reactor and a second reactor; the first reactor comprises a first fiber membrane mass transfer reactor and a first phase separation tank; the second reactor comprises a second fiber membrane mass transfer reactor and a second phase separation tank; the light coal tar enters the light coal tar buffer tank; the booster pump transports the light coal tar to the first reactor together with one stream of lean alkali liquid pumped by a lean alkali liquid pump to perform primary mercaptan removal; then the light coal tar enters the first phase separation tank to perform settlement separation; the separated light coal tar is sent out from the top of the first phase separation tank, filtered by a fine filter, and then transported into the second reactor together with another stream of lean alkali liquid pumped by the lean alkali liquid pump to perform secondary mercaptan removal. The application solves the problem that the light coal tar generates a large amount of odor during storage, loading and transportation.

Description

Technical Field

[0001] This invention belongs to the field of coal chemical environmental protection technology, and in particular relates to a system for removing odors from light coal tar. Background Technology

[0002] With the continuous development and expansion of the national economy and industry, coal chemical projects are increasing, and the resulting coal tar has become a widely used chemical raw material. Improving the transfer, transportation, conversion, and application of coal tar while protecting the environment has placed new demands on coal tar processing.

[0003] Light coal tar has a strong odor due to its high volatility and sulfur content, which significantly impacts the environment during storage and transportation. Reducing this odor has become a crucial challenge. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a safe and reliable odor removal system for light coal tar, which aims to reduce environmental pollution and solve the problem of strong odor generated by light coal tar during storage, loading and transportation.

[0005] To achieve the aforementioned objectives, the technical solution adopted is as follows:

[0006] A light coal tar odor removal system includes an odor removal system comprising a light coal tar buffer tank, a booster pump, a primary reactor, and a secondary reactor. The primary reactor includes a first fiber membrane mass transfer reactor and a first phase separation tank located below the first fiber membrane mass transfer reactor. The secondary reactor includes a second fiber membrane mass transfer reactor and a second phase separation tank located below the second fiber membrane mass transfer reactor. The inlet of the light coal tar buffer tank is connected to a light coal tar pipeline, and its outlet is connected to the inlet of the first fiber membrane mass transfer reactor via an outlet pipeline. The outlet pipeline is equipped with a booster pump and a booster pump outlet control valve. The inlet of the first fiber membrane mass transfer reactor is also connected to a first branch regeneration alkali solution pipeline. The light coal tar and alkali solution react in the first fiber membrane mass transfer reactor of the primary reactor to complete the first-stage desulfurization. After primary desulfurization, the light coal tar liquid phase enters the first phase separation tank at the bottom of the first fiber membrane mass transfer reactor. The outlet of the first phase separation tank is connected to the inlet of a fine filter via a pipeline. The outlet of the fine filter is connected to the inlet of the second fiber membrane mass transfer reactor via a pipeline. The inlet of the second fiber membrane mass transfer reactor is also connected to a second branch regeneration alkali solution pipeline. The light coal tar after primary desulfurization reacts with the alkali solution from the second branch regeneration alkali solution pipeline in the second fiber membrane mass transfer reactor of the secondary reactor to complete the secondary desulfurization. The mixture of the light coal tar liquid after secondary desulfurization and the lean alkali solution settles and separates in the second phase separation tank. The inlet of the second phase separation tank is connected to a pipeline, and the outlet is connected to a refined light coal tar storage tank via a refined light coal tar pipeline. A separation tank is set at the bottom of the refined light coal tar storage tank.

[0007] Preferably, the system also includes an alkali regeneration system, which comprises alkali regeneration branch pipes, an alkali regeneration main pipe, an alkali oxidation tower, an alkali stripping tower, a stripping nitrogen pipeline, a lean alkali pump, and an alkali fine filter. Alkali regeneration branch pipes are connected to the bottoms of the first-phase separation tank, the second-phase separation tank, and the separation tanks. These branch pipes converge and connect to the main alkali regeneration pipe. The other end of the main alkali regeneration pipe is connected to the lower part of the alkali oxidation tower. A alkali recovery control valve is installed on the main alkali regeneration pipe. A catalyst injector is connected to the lower part of the alkali oxidation tower. The inlet of the catalyst injector is connected to the alkali regeneration branch pipe at the bottom of the first-phase separation tank via a pipeline, with a first control valve pre-connected to the catalyst injector. The outlet of the catalyst injector is connected to the main alkali regeneration pipe via a pipeline, with a second control valve post-connected to the catalyst injector. The system has an inlet at the top. When the catalyst concentration or alkali regeneration is insufficient, catalyst is added through the catalyst injector inlet. The first control valve and the second control valve are opened, while the alkali recovery control valve is closed to add catalyst. A compressed air pipeline is connected to the lower part of the alkali oxidation tower, and a compressed air flow control valve is installed on the compressed air pipeline. The middle part of the alkali oxidation tower is connected to the middle part of the alkali stripping tower through a pipeline. The stripping nitrogen pipeline is connected to the lower part of the alkali stripping tower. The bottom of the alkali stripping tower is connected to the inlet of the lean alkali pump through a pipeline. The inlet of the lean alkali pump is also connected to a fresh alkali replenishment pipeline. The outlet of the lean alkali pump is connected to the inlet of the fine alkali filter through a pipeline. The outlet of the fine alkali filter is connected to the first branch regenerated alkali pipeline and the second branch regenerated alkali pipeline.

[0008] Preferably, a first liquid level control valve is provided on the alkali regeneration branch pipe connected to the bottom of the first phase separation tank, a second liquid level control valve is provided on the alkali regeneration branch pipe connected to the bottom of the second phase separation tank, and an alkali recovery pump is provided on the alkali regeneration branch pipe connected to the bottom of the refined light coal tar storage tank.

[0009] Preferably, the top of the alkali oxidation tower and the top of the alkali stripping tower are both connected to the tail gas water seal tank via gas phase pipelines. The gas phase pipeline connected to the top of the alkali oxidation tower is equipped with a gas phase pressure control valve. The inlet of the tail gas water seal tank is connected to a fresh water supply pipeline. The top of the tail gas water seal tank is connected to a pipeline leading to the incineration system, and the bottom is connected to the inlet of the wastewater pump via a pipeline. The outlet of the wastewater pump is connected to a pipeline leading to the sewage treatment system.

[0010] Preferably, a first flow control valve is provided on the first branch regenerated alkali solution pipeline, and a second flow control valve is provided on the second branch regenerated alkali solution pipeline.

[0011] Preferably, the outlet of the refined light coal tar storage tank is connected to an external irrigation pipeline, and a refined light coal tar pump and a coal tar pump outlet control valve are installed on the external irrigation pipeline.

[0012] Preferably, the outlet of the lean alkali pump is also connected to an external pipeline leading to the sewage treatment system, and the external pipeline is equipped with an external flow control valve.

[0013] Preferably, the system also includes a nitrogen purging and steam cooking system, which comprises a nitrogen pipeline, a disulfide storage tank, and a steam pipeline. The nitrogen pipeline is connected to the light coal tar buffer tank, the first-phase separation tank, the second-phase separation tank, the refined light coal tar storage tank, and the disulfide storage tank. This system is primarily used to purge toxic and harmful gases from the aforementioned equipment during maintenance, preventing poisoning accidents. The disulfide storage tank is connected to the middle section of the alkaline oxidation tower via an alkaline solution pipeline containing disulfide. The outlet of the disulfide storage tank is connected to the inlet of the refined light coal tar storage tank via a disulfide pump outlet pipeline. A disulfide pump is installed on the disulfide pump outlet pipeline. The steam pipeline is connected to the nitrogen pipeline. The steam pipeline is connected to the light coal tar buffer tank, the first phase separation tank, the second phase separation tank, the refined light coal tar storage tank, and the disulfide storage tank via the nitrogen pipeline. It is mainly used for steaming and purging the above equipment during maintenance to prevent poisoning, fire, and explosion accidents caused by toxic and harmful gases during maintenance.

[0014] Preferably, the system also includes a venting system, which comprises a first venting pipeline connected to the top of the light coal tar buffer tank, a second venting pipeline connected to the top of the first phase separation tank, a third venting pipeline connected to the top of the second phase separation tank, a fourth venting pipeline connected to the top of the refined light coal tar storage tank, and a fifth venting pipeline connected to the top of the disulfide storage tank. All venting pipelines converge into the main venting pipeline and vent to the flare, which plays a certain role in system replacement, prevents equipment pressure buildup, and effectively prevents overpressure accidents.

[0015] Preferably, both the primary reactor and the secondary reactor use lean alkali solution as the washing liquid for deodorization.

[0016] The beneficial effects of this invention are as follows: This invention provides a safer, more reliable, and more effective odor removal system for light coal tar, significantly improving the purification technology of light coal tar compared to existing technologies. This odor removal system can remove most of the C3 and lower mercaptans, significantly reducing the odor of light coal tar, facilitating storage and transportation, and better protecting the environment. The system of this invention has a simple structure, is easy to operate, and requires low investment. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] like Figure 1 As shown, a light coal tar odor removal system includes an odor removal system, an alkaline regeneration system, a nitrogen replacement system, a steam cooking system, and a venting system.

[0022] The odor removal system includes a light coal tar buffer tank 1, a booster pump 3, a primary reactor, and a secondary reactor. The primary reactor includes a first fiber membrane mass transfer reactor 5 and a first phase separation tank 6 located below the first fiber membrane mass transfer reactor 5. The secondary reactor includes a second fiber membrane mass transfer reactor 8 and a second phase separation tank 9 located below the second fiber membrane mass transfer reactor 8. The inlet of the light coal tar buffer tank 1 is connected to a light coal tar pipeline 2, and the outlet is connected to the inlet of the first fiber membrane mass transfer reactor 5 via an outlet pipeline. The outlet pipeline is equipped with a booster pump 3 and a booster pump outlet control valve 4. The inlet of the first fiber membrane mass transfer reactor 5 is also connected to a first branch regeneration alkali solution pipeline 50. The light coal tar and alkali solution react in the first fiber membrane mass transfer reactor 5 of the primary reactor to complete the first-stage desulfurization. After the first-stage desulfurization, the light coal tar... The tar liquid phase enters the first phase separation tank 6 at the bottom of the first fiber membrane mass transfer reactor 5. The outlet of the first phase separation tank 6 is connected to the inlet of the fine filter 7 via a pipeline. The outlet of the fine filter 7 is connected to the inlet of the second fiber membrane mass transfer reactor 8 via a pipeline. The inlet of the second fiber membrane mass transfer reactor 8 is also connected to the second branch regeneration alkali solution pipeline 51. The light coal tar after primary desulfurization reacts with the alkali solution from the second branch regeneration alkali solution pipeline 51 in the second fiber membrane mass transfer reactor 8 of the secondary reactor to complete the secondary desulfurization. The mixture of the light coal tar liquid after secondary desulfurization and the lean alkali solution settles and separates in the second phase separation tank 9. The inlet of the second phase separation tank 9 is connected to a pipeline, and the outlet is connected to the refined light coal tar storage tank 11 via the refined light coal tar pipeline 10. A separation tank 17 is provided at the bottom of the refined light coal tar storage tank 11.

[0023] The alkali regeneration system includes alkali regeneration branch pipes, alkali regeneration main pipe, alkali oxidation tower 19, alkali stripping tower 23, stripping nitrogen pipeline 24, lean alkali pump 27, and alkali fine filter 28. Alkali regeneration branch pipes are connected to the bottoms of the first phase separation tank 6, the second phase separation tank 9, and the separation tank 17. These branch pipes converge and connect to the alkali regeneration main pipe. The other end of the main pipe is connected to the lower part of the alkali oxidation tower 19. A alkali recovery control valve 20 is installed on the main pipe. A catalyst injector 43 is connected to the lower part of the alkali oxidation tower 19. The inlet of the catalyst injector 43 is connected to the alkali regeneration branch pipe at the bottom of the first phase separation tank 6 via a pipeline. A first control valve 44 is connected before the catalyst injector 43, and the outlet of the catalyst injector 43 is connected to the alkali regeneration main pipe via a pipeline. A second control valve 45 is connected after the catalyst injector 43. An inlet is provided at the upper end of the catalyst injector 43. When the catalyst concentration or alkali regeneration in the system is insufficient, catalyst is added through the catalyst injector 43 inlet. The first control valve 44 and the second control valve 45 are opened, while the alkali recovery control valve 20 is closed to add catalyst. A compressed air pipeline 21 is connected to the lower part of the alkali oxidation tower 19. A compressed air flow control valve 22 is installed on the compressed air pipeline 21. The middle part of the alkali oxidation tower 19 is connected to the middle part of the alkali stripping tower 23 through a pipeline. The stripping nitrogen pipeline 24 is connected to the lower part of the alkali stripping tower 23. The bottom of the alkali stripping tower 23 is connected to the inlet of the lean alkali pump 27 through a pipeline. The inlet of the lean alkali pump 27 is also connected to a fresh alkali replenishment pipeline 31. The outlet of the lean alkali pump 27 is connected to the inlet of the alkali fine filter 28 through a pipeline. The outlet of the alkali fine filter 28 is connected to the first branch regenerated alkali pipeline 50 and the second branch regenerated alkali pipeline 51.

[0024] A first liquid level control valve 15 is installed on the alkali regeneration branch pipe connected to the bottom of the first phase separation tank 6, a second liquid level control valve 16 is installed on the alkali regeneration branch pipe connected to the bottom of the second phase separation tank 9, and an alkali recovery pump 18 is installed on the alkali regeneration branch pipe connected to the bottom of the refined light coal tar storage tank 11.

[0025] The top of the alkaline oxidation tower 19 and the top of the alkaline stripping tower 23 are both connected to the tail gas water seal tank 39 via a gas phase pipeline 38. A gas phase pressure control valve is installed on the gas phase pipeline 38 connected to the top of the alkaline oxidation tower 19. A fresh water supply pipeline 42 is connected to the inlet of the tail gas water seal tank 39. A pipeline 40 leading to the incineration system is connected to the top of the tail gas water seal tank 39. The bottom of the tail gas water seal tank 39 is connected to the inlet of the wastewater pump 41 via a pipeline. A pipeline leading to the sewage treatment system is connected to the outlet of the wastewater pump 41.

[0026] The first branch regenerated alkali solution pipeline 50 is equipped with a first flow control valve 29, and the second branch regenerated alkali solution pipeline 51 is equipped with a second flow control valve 30.

[0027] The outlet of the refined light coal tar storage tank 11 is connected to an external irrigation pipeline 14, and the external irrigation pipeline 14 is equipped with a refined light coal tar pump 12 and a coal tar pump outlet control valve 13.

[0028] The outlet of the lean alkali pump 27 is also connected to an external pipeline that supplies wastewater to the wastewater treatment system, and an external flow control valve 32 is provided on the external pipeline.

[0029] The nitrogen replacement and steam cooking system includes a nitrogen pipeline 48, a disulfide storage tank 34, and a steam pipeline 47. The nitrogen pipeline 48 is connected to the light coal tar buffer tank 1, the first-phase separator 6, the second-phase separator 9, the refined light coal tar storage tank 11, and the disulfide storage tank 34. It is mainly used to replace toxic and harmful gases in the aforementioned equipment during maintenance to prevent poisoning accidents. The disulfide storage tank 34 is connected to the middle of the alkaline oxidation tower 19 via an alkaline solution pipeline 33 containing disulfide. The outlet is connected to the inlet of the refined light coal tar storage tank 11 via the disulfide pump outlet pipeline 36. The disulfide pump outlet pipeline 36 is equipped with a disulfide pump 35. The steam pipeline 47 is connected to the nitrogen pipeline 48. The steam pipeline 47 is connected to the light coal tar buffer tank 1, the first phase separation tank 6, the second phase separation tank 9, the refined light coal tar storage tank 11, and the disulfide storage tank 34 via the nitrogen pipeline 48. It is mainly used for steaming and purging the above equipment during maintenance to prevent poisoning, fire, and explosion accidents caused by toxic and harmful gases during maintenance.

[0030] The venting system includes a first venting pipeline 52 connected to the top of the light coal tar buffer tank 1, a second venting pipeline 53 connected to the top of the first phase separation tank 6, a third venting pipeline 54 connected to the top of the second phase separation tank 9, a fourth venting pipeline 55 connected to the top of the refined light coal tar storage tank 11, and a fifth venting pipeline 56 connected to the top of the disulfide storage tank 34. All venting pipelines converge into the main venting pipeline 49 and vent to the flare, which plays a certain role in system replacement, prevents equipment pressure buildup, and effectively prevents overpressure accidents.

[0031] Both the primary and secondary reactors use lean alkaline solution as the washing liquid for deodorizing.

[0032] In operation, light coal tar enters a light coal tar buffer tank. A booster pump at the bottom of the buffer tank pumps the light coal tar along with a stream of lean alkali solution from a lean alkali solution pump to the first fiber membrane mass transfer reactor of the primary reactor. The reaction occurs through the fiber membrane to complete the first-stage desulfurization. The mixture of light coal tar and lean alkali solution settles and separates in a first phase separation tank at the bottom of the first fiber membrane mass transfer reactor. The separated light coal tar is then discharged from the top of the first phase separation tank, filtered through a fine filter, and then mixed with another stream of lean alkali solution from the lean alkali solution pump. The light coal tar is fed into the second fiber membrane mass transfer reactor of the secondary reactor to complete the second-stage desulfurization. The light coal tar and lean alkali solution are mixed and separated in the second phase separation tank at the bottom of the second fiber membrane mass transfer reactor. After two-stage deodorization, the light coal tar is sent out through the top of the second phase separation tank and mixed with the alkali solution containing disulfide pumped by the disulfide pump. The mixture is then sent to the refined light coal tar storage tank. Due to the high density of the alkali solution, it settles in the separation tank at the bottom of the refined light coal tar storage tank. The mixture of light coal tar and disulfide is then sent to the irrigation area by the refined light coal tar pump.

[0033] The alkaline solution containing thiols at the bottom of the first phase separation tank of the primary reactor, the alkaline solution containing thiols at the bottom of the second phase separation tank of the secondary reactor, and the semi-lean alkaline solution separated from the bottom separation tank of the refined light coal tar storage tank are combined by the alkaline solution recovery pump and enter the tower from the bottom of the alkaline solution oxidation tower. The alkaline solution containing thiols, the catalyst (sulfonated cobalt phthalocyanine), and the air complete the oxidation reaction in the tower.

[0034] Absorption reaction: RSH + NaOH → NaSR + H2O

[0035] Oxidation reaction:

[0036] The semi-lean alkali solution, regenerated after oxidation, is drawn from the middle of the alkali oxidation tower and sent to the middle of the alkali stripping tower. Nitrogen gas enters from the bottom of the alkali stripping tower to strip the semi-lean alkali solution, producing lean alkali solution. This lean alkali solution is then pumped to a fine alkali filter and filtered before entering the first and second fiber membrane mass transfer reactors of the primary and secondary reactors. Fresh alkali solution is periodically replenished according to its concentration through the inlet of the lean alkali solution pump. If the alkali system needs to discharge waste alkali solution to wastewater treatment, it is discharged through a branch pipeline at the outlet of the lean alkali solution pump.

[0037] After oxidation, the alkaline solution containing disulfides overflows from the top of the alkaline oxidation tower through the baffle to the disulfide storage tank. The alkaline solution containing disulfides is then pumped by the disulfide pump to the secondary reactor. The light coal tar goes to the refined light coal tar storage tank and the light coal tar liquid phase pipeline.

[0038] The gas phase from the top of the alkaline oxidation tower is discharged and merges with the gas phase from the top of the alkaline stripping tower before directly entering the tail gas water seal tank. The top gas phase of the tail gas water seal tank is sent to the incineration system, while the liquid phase is pumped to the wastewater treatment plant by a wastewater pump. A fresh water supply line can replenish the tail gas water seal tank with fresh water.

[0039] The catalyst will gradually deactivate as the alkaline solution is used for a long time. At the same time, a small amount of catalyst will also be carried away by the separated media such as disulfides and wastewater. Therefore, it is necessary to replenish the catalyst regularly and replace part of the alkaline solution regularly.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, or combinations 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 system for removing odors from light coal tar, characterized in that: The system includes an odor removal system comprising a light coal tar buffer tank, a booster pump, a primary reactor, and a secondary reactor. The primary reactor includes a first fiber membrane mass transfer reactor and a first phase separation tank located below it. The secondary reactor includes a second fiber membrane mass transfer reactor and a second phase separation tank located below it. The inlet of the light coal tar buffer tank is connected to a light coal tar pipeline, and its outlet is connected to the inlet of the first fiber membrane mass transfer reactor via an outlet pipeline. The outlet pipeline is equipped with a booster pump and a booster pump outlet control valve. The inlet of the first fiber membrane mass transfer reactor is also connected to a first branch regeneration alkali solution pipeline. The light coal tar and alkali solution react in the first fiber membrane mass transfer reactor of the primary reactor to complete the first-stage desulfurization. The liquid phase of light coal tar after primary desulfurization enters the first phase separation tank at the bottom of the first fiber membrane mass transfer reactor. The outlet of the first phase separation tank is connected to the inlet of a fine filter via a pipeline. The outlet of the fine filter is connected to the inlet of the second fiber membrane mass transfer reactor via a pipeline. The inlet of the second fiber membrane mass transfer reactor is also connected to a second branch regeneration alkali solution pipeline. The light coal tar after primary desulfurization reacts with the alkali solution from the second branch regeneration alkali solution pipeline in the second fiber membrane mass transfer reactor of the secondary reactor to complete the secondary desulfurization. The mixture of the light coal tar liquid after secondary desulfurization and the lean alkali solution settles and separates in the second phase separation tank. The outlet of the second phase separation tank is connected to a refined light coal tar storage tank via a refined light coal tar pipeline. A separation tank is set at the bottom of the refined light coal tar storage tank. The alkali regeneration system includes alkali regeneration branch pipes, an alkali regeneration main pipe, an alkali oxidation tower, an alkali stripping tower, a stripping nitrogen pipeline, a lean alkali pump, and an alkali fine filter. Alkali regeneration branch pipes are connected to the bottoms of the first-phase separation tank, the second-phase separation tank, and the separation tanks. These branch pipes converge and connect to the main alkali regeneration pipe. The other end of the main alkali regeneration pipe is connected to the lower part of the alkali oxidation tower. A alkali recovery control valve is installed on the main alkali regeneration pipe. A catalyst injector is connected to the lower part of the alkali oxidation tower. The inlet of the catalyst injector is connected to the alkali regeneration branch pipe at the bottom of the first-phase separation tank via a pipeline, and a first control valve is installed before the catalyst injector. The outlet of the catalyst injector is connected to the main alkali regeneration pipe via a pipeline, and a second control valve is installed after the catalyst injector. The system has an inlet at the top. When the catalyst concentration or alkali regeneration is insufficient, catalyst is added through the catalyst injector inlet. The first control valve and the second control valve are opened, while the alkali recovery control valve is closed to add catalyst. A compressed air pipeline is connected to the bottom of the alkali oxidation tower, and a compressed air flow control valve is installed on the compressed air pipeline. The middle part of the alkali oxidation tower is connected to the middle part of the alkali stripping tower through a pipeline. The stripping nitrogen pipeline is connected to the bottom of the alkali stripping tower. The bottom of the alkali stripping tower is connected to the inlet of the lean alkali pump through a pipeline. The inlet of the lean alkali pump is also connected to a fresh alkali replenishment pipeline. The outlet of the lean alkali pump is connected to the inlet of the fine alkali filter through a pipeline. The outlet of the fine alkali filter is connected to the first branch regenerated alkali pipeline and the second branch regenerated alkali pipeline. A nitrogen purging and steam cooking system includes a nitrogen pipeline, a disulfide storage tank, and a steam pipeline. The nitrogen pipeline is connected to a light coal tar buffer tank, a first-phase separation tank, a second-phase separation tank, a refined light coal tar storage tank, and a disulfide storage tank. The disulfide storage tank is connected to the middle of an alkaline oxidation tower via a disulfide-containing alkaline solution pipeline. The outlet of the disulfide storage tank is connected to the inlet of the refined light coal tar storage tank via a disulfide pump outlet pipeline. A disulfide pump is installed on the disulfide pump outlet pipeline. The steam pipeline is connected to the nitrogen pipeline and is connected to the light coal tar buffer tank, the first-phase separation tank, the second-phase separation tank, the refined light coal tar storage tank, and the disulfide storage tank via the nitrogen pipeline.

2. The odor removal system for light coal tar according to claim 1, characterized in that: A first liquid level control valve is installed on the alkali regeneration branch pipe connected to the bottom of the first phase separation tank, a second liquid level control valve is installed on the alkali regeneration branch pipe connected to the bottom of the second phase separation tank, and an alkali recovery pump is installed on the alkali regeneration branch pipe connected to the bottom of the refined light coal tar storage tank.

3. The odor removal system for light coal tar according to claim 1, characterized in that: Both the top of the alkali oxidation tower and the top of the alkali stripping tower are connected to the tail gas water seal tank via gas phase pipelines. The gas phase pipeline connected to the top of the alkali oxidation tower is equipped with a gas phase pressure control valve. The inlet of the tail gas water seal tank is connected to a fresh water supply pipeline. The top of the tail gas water seal tank is connected to a pipeline leading to the incineration system, and the bottom is connected to the inlet of the wastewater pump via a pipeline. The outlet of the wastewater pump is connected to a pipeline leading to the sewage treatment system.

4. The odor removal system for light coal tar according to claim 1, characterized in that: The first branch regenerated alkali solution pipeline is equipped with a first flow control valve, and the second branch regenerated alkali solution pipeline is equipped with a second flow control valve.

5. The odor removal system for light coal tar according to claim 1, characterized in that: The outlet of the refined light coal tar storage tank is connected to an external irrigation pipeline, and a refined light coal tar pump and a coal tar pump outlet control valve are installed on the external irrigation pipeline.

6. The odor removal system for light coal tar according to claim 1, characterized in that: The outlet of the lean alkali pump is also connected to an external pipeline that supplies water to the sewage treatment system, and the external pipeline is equipped with an external flow control valve.

7. The odor removal system for light coal tar according to claim 1, characterized in that: It also includes a venting system, which includes a first venting pipeline connected to the top of the light coal tar buffer tank, a second venting pipeline connected to the top of the first phase separation tank, a third venting pipeline connected to the top of the second phase separation tank, a fourth venting pipeline connected to the top of the refined light coal tar storage tank, and a fifth venting pipeline connected to the top of the disulfide storage tank. All the venting pipelines converge into the main venting pipeline and then vent to the flare.

8. The odor removal system for light coal tar according to claim 1, characterized in that: Both the primary and secondary reactors use lean alkaline solution as the washing liquid for deodorizing.

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