A multi-stage tail gas resource treatment system

Abstract

The utility model relates to chemical production technology, show a kind of multistage tail gas resource treatment system, including chlorination kettle, absorption tower, water scrubbing tower, primary falling film absorber, secondary falling film absorber, caustic washing tower and RTO processing system;The outlet of chlorination kettle is connected with the inlet of absorption tower, the outlet of absorption tower is connected with the inlet of water scrubbing tower, the outlet of water scrubbing tower is connected with the inlet of primary falling film absorber, the outlet of primary falling film absorber is connected with the inlet of secondary falling film absorber, the outlet of secondary falling film absorber is connected with the inlet of caustic washing tower, the outlet of caustic washing tower is connected with the inlet of RTO processing system, through absorption tower and two-stage falling film absorber, the efficient recovery to unreacted hydrogen chloride is realized, and by-product hydrochloric acid is produced, resource utilization is improved, the combination of water scrubbing tower, caustic washing tower and RTO processing system ensures that tail gas is discharged up to standard, reduces environmental pollution.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and more specifically, to a multi-stage tail gas resource recovery system. Background Technology

[0002] In chemical production processes, chlorination reactions generate large amounts of hydrogen chloride tail gas. Traditional tail gas treatment methods mainly focus on end-of-pipe treatment, such as direct combustion or alkaline absorption. While these methods can reduce tail gas emissions to some extent, they also present problems such as resource waste, high treatment costs, and secondary pollution. For example, direct combustion consumes a large amount of energy and may produce other harmful gases, while the waste alkaline solution generated by alkaline absorption is difficult to treat. Utility Model Content

[0003] This application provides a multi-stage exhaust gas resource recovery system, which solves the problem that traditional exhaust gas treatment methods mainly focus on end-of-pipe treatment, such as direct combustion or alkaline absorption. Although these methods can reduce exhaust gas emissions to a certain extent, they have problems such as resource waste, high treatment costs, and secondary pollution.

[0004] This application provides a multi-stage tail gas resource recovery system, including a chlorination reactor, an absorption tower, a water scrubbing tower, a primary falling film absorption tower, a secondary falling film absorption tower, an alkaline scrubbing tower, and an RTO treatment system; The outlet of the chlorination reactor is connected to the inlet of the absorption tower, the outlet of the absorption tower is connected to the inlet of the water washing tower, the outlet of the water washing tower is connected to the inlet of the first-stage falling film absorption tower, the outlet of the first-stage falling film absorption tower is connected to the inlet of the second-stage falling film absorption tower, the outlet of the second-stage falling film absorption tower is connected to the inlet of the alkaline washing tower, and the outlet of the alkaline washing tower is connected to the inlet of the RTO treatment system.

[0005] Preferably, the outlet of the absorption tower is connected to the feed pipe of the chlorination reactor via a pipeline.

[0006] Preferably, the absorption tower is equipped with a concentration detector.

[0007] Preferably, the outlet at the bottom of the water washing tower is connected to a water washing tower circulation pump via a pipe, and the water washing tower circulation pump is connected to the water washing spray device via the water washing tower circulation pipe.

[0008] Preferably, the outlet of the primary falling film absorber is connected to the primary circulation tank, and the outlet of the primary circulation tank is connected to the primary falling film absorber via a primary circulation pump. The outlet of the secondary falling film absorber is connected to the secondary circulation tank, and the outlet of the secondary circulation tank is connected to the secondary falling film absorber via a secondary circulation pump.

[0009] Preferably, the outlet at the bottom of the alkaline washing tower is connected to an alkaline washing tower circulation pump via a pipeline, and the alkaline washing tower circulation pump is connected to the alkaline washing spray device via an alkaline washing tower circulation pipe.

[0010] As can be seen from the above technical solution, this application provides a multi-stage tail gas resource utilization system. In use, 1860 kg of anhydrous ethanol is added to the absorption tower to receive hydrogen chloride tail gas from the chlorination reactor. When the hydrogen chloride content reaches approximately 10%, the absorption reactor liquid is recycled to achieve resource recycling. The tail gas treated by the absorption tower enters a water scrubbing tower, where multi-stage spraying technology removes impurities and some hydrogen chloride, initially purifying the tail gas. The tail gas treated by the water scrubbing tower enters a first-stage falling film absorber, reacting with the sprayed water to generate low-concentration hydrochloric acid, which initially absorbs hydrogen chloride. The tail gas treated by the first-stage falling film absorber enters a second-stage falling film absorber to further absorb the remaining hydrogen chloride and increase the hydrochloric acid concentration. The tail gas treated by the two-stage falling film absorbers enters an alkaline scrubbing tower, where multi-stage spraying alkaline solution neutralizes the residual hydrogen chloride, ensuring the tail gas meets emission standards. The tail gas treated by the alkaline scrubbing tower enters an RTO treatment system for final treatment, ensuring that the tail gas fully meets emission standards and reducing environmental pollution.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves efficient recovery of unreacted hydrogen chloride and produces hydrochloric acid as a byproduct by means of an absorption tower and a two-stage falling film absorber, thereby improving resource utilization.

[0012] 2. The combination of the water washing tower, alkali washing tower and RTO treatment system in this utility model ensures that the exhaust gas meets the emission standards and reduces environmental pollution.

[0013] In summary, a multi-stage tail gas resource recovery system achieves efficient recovery of unreacted hydrogen chloride and produces hydrochloric acid as a byproduct through an absorption tower and a two-stage falling film absorber, thereby improving resource utilization. The combination of a water washing tower, an alkaline washing tower, and an RTO treatment system ensures that the tail gas meets emission standards and reduces environmental pollution. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] Figure 1 A schematic diagram of a multi-stage exhaust gas resource recovery system provided by this utility model; Figure 2 A schematic diagram of a multi-stage exhaust gas resource recovery system provided by this utility model; Figure 3This is a schematic diagram of a multi-stage exhaust gas resource recovery system provided by this utility model.

[0016] The reference numerals in the detailed embodiments are as follows: 1. Chlorination reactor; 2. Absorption tower; 3. Water washing tower; 4. Primary falling film absorber; 5. Secondary falling film absorber; 6. Alkali washing tower; 7. RTO treatment system; 8. Outlet; 9. Feed pipe; 10. Water washing tower circulation pump; 11. Water washing tower circulation pipe; 12. Water washing spray device; 13. Primary circulation tank; 14. Secondary circulation tank; 15. Primary circulation pump; 16. Secondary circulation pump; 17. Alkali washing tower circulation pump; 18. Alkali washing tower circulation pipe; 19. Alkali washing spray device; 20. Concentration detector. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0018] See Figure 1-3 This application proposes a multi-stage tail gas resource recovery system. Traditional tail gas treatment methods, such as direct combustion or alkaline absorption, primarily focus on end-of-pipe treatment. While these methods can reduce tail gas emissions to some extent, they suffer from resource waste, high treatment costs, and secondary pollution. The system utilizes an absorption tower and a two-stage falling film absorber to achieve efficient recovery of unreacted hydrogen chloride and produce hydrochloric acid as a byproduct, thus improving resource utilization. The combination of a water scrubbing tower, an alkaline scrubbing tower, and an RTO treatment system ensures that tail gas emissions meet standards, reducing environmental pollution.

[0019] Specifically, a multi-stage tail gas resource recovery system includes a chlorination reactor 1, an absorption tower 2, a water scrubbing tower 3, a primary falling film absorber 4, a secondary falling film absorber 5, an alkaline scrubbing tower 6, and an RTO treatment system 7. The outlet of the chlorination reactor 1 is connected to the inlet of the absorption tower 2, and the outlet of the absorption tower 2 is connected to the inlet of the water scrubbing tower 3. The outlet 8 of the absorption tower 2 is connected to the feed pipe 9 of the chlorination reactor 1 via a pipeline. The absorption tower 2 is equipped with a concentration detector 20. 1860 kg of anhydrous ethanol is added to the absorption tower 2 to receive hydrogen chloride tail gas from the chlorination reactor 1. When the hydrogen chloride content reaches about 10%, the absorption reactor liquid is recycled to achieve resource recycling. The water scrubbing tower... The bottom outlet of the water washing tower 3 is connected to a water washing tower circulation pump 10 via a pipe. The water washing tower circulation pump 10 is connected to a water washing spray device 12 via a water washing tower circulation pipe 11. The water washing spray device 12 installed in the water washing tower 3 ensures that impurities and some hydrogen chloride in the exhaust gas are fully removed. The exhaust gas treated by the absorption tower 2 enters the water washing tower 3, where impurities and some hydrogen chloride are removed through multi-stage spraying technology, thus initially purifying the exhaust gas. The outlet of the water washing tower 3 is connected to the inlet of the first-stage falling film absorber 4, and the outlet of the first-stage falling film absorber 4 is connected to the inlet of the second-stage falling film absorber 5. The exhaust gas treated by the water washing tower 3 enters the first-stage falling film absorber 4 and reacts with the sprayed water to produce... The exhaust gas, after being treated by the first-stage falling film absorber 4, enters the second-stage falling film absorber 5 to further absorb the remaining hydrogen chloride and increase the hydrochloric acid concentration. The outlet of the second-stage falling film absorber 5 is connected to the inlet of the alkaline scrubbing tower 6. The exhaust gas, after being treated by the two-stage falling film absorbers, enters the alkaline scrubbing tower 6, where residual hydrogen chloride is neutralized by multi-stage spraying of alkaline solution, ensuring that the exhaust gas meets emission standards. The outlet of the first-stage falling film absorber 4 is connected to the first-stage circulation tank 13, and the outlet of the first-stage circulation tank 13 is connected to the first-stage falling film absorber 4 via the first-stage circulation pump 15. This recycling of the absorbent liquid saves resources. The outlet of the second-stage falling film absorber 5... The secondary circulation tank 14 is connected to the secondary circulation tank 14. The outlet of the secondary circulation tank 14 is connected to the secondary falling film absorber 5 through the secondary circulation pump 16. The primary falling film absorber 4 and the secondary falling film absorber 5 are filled with high-efficiency packing to ensure efficient absorption of hydrogen chloride. The outlet of the alkaline scrubbing tower 6 is connected to the inlet of the RTO treatment system 7. The RTO treatment system 7 ensures that the exhaust gas fully meets the emission standards and reduces environmental pollution. The outlet at the bottom of the alkaline scrubbing tower 6 is connected to the alkaline scrubbing tower circulation pump 17 through a pipe. The alkaline scrubbing tower circulation pump 17 is connected to the alkaline scrubbing spray device 19 through the alkaline scrubbing tower circulation pipe 18. The alkaline scrubbing spray device 19 installed in the alkaline scrubbing tower 6 ensures that the hydrogen chloride in the exhaust gas is fully neutralized.

[0020] As can be seen from the above technical solution, in the operation of a multi-stage tail gas resource utilization system, 1860 kg of anhydrous ethanol is added to the absorption tower 2 to receive hydrogen chloride tail gas from the chlorination reactor 1. When the hydrogen chloride content reaches about 10%, the absorption reactor liquid is recycled to achieve resource recycling. The tail gas treated by the absorption tower 2 enters the water washing tower 3, where impurities and some hydrogen chloride are removed through multi-stage spraying technology, and the tail gas is initially purified. The tail gas treated by the water washing tower 3 enters the first-stage falling film absorber 4, where it reacts with the sprayed water to generate low-concentration hydrochloric acid, which initially absorbs hydrogen chloride. The tail gas treated by the first-stage falling film absorber 4 enters the second-stage falling film absorber 5 to further absorb the remaining hydrogen chloride and increase the hydrochloric acid concentration. The tail gas treated by the two-stage falling film absorbers enters the alkaline washing tower 6, where the residual hydrogen chloride is neutralized by the alkaline solution sprayed through multi-stage spraying, ensuring that the tail gas meets emission standards. The tail gas treated by the alkaline washing tower 6 enters the RTO treatment system 7 for final treatment, ensuring that the tail gas fully meets emission standards and reducing environmental pollution.

[0021] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0022] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A multi-stage exhaust gas resource recovery system, characterized in that: It includes a chlorination reactor (1), an absorption tower (2), a water washing tower (3), a primary falling film absorber (4), a secondary falling film absorber (5), an alkaline washing tower (6), and an RTO treatment system (7). The outlet of the chlorination reactor (1) is connected to the inlet of the absorption tower (2), the outlet of the absorption tower (2) is connected to the inlet of the water washing tower (3), the outlet of the water washing tower (3) is connected to the inlet of the first-stage falling film absorber (4), the outlet of the first-stage falling film absorber (4) is connected to the inlet of the second-stage falling film absorber (5), the outlet of the second-stage falling film absorber (5) is connected to the inlet of the alkaline washing tower (6), and the outlet of the alkaline washing tower (6) is connected to the inlet of the RTO treatment system (7).

2. The multi-stage exhaust gas resource recovery system according to claim 1, characterized in that: The outlet (8) of the absorption tower (2) is connected to the feed pipe (9) of the chlorination reactor (1) via a pipeline.

3. The multi-stage exhaust gas resource recovery system according to claim 1, characterized in that: The absorption tower (2) is equipped with a concentration detector (20).

4. The multi-stage exhaust gas resource recovery system according to claim 1, characterized in that: The outlet at the bottom of the water washing tower (3) is connected to a water washing tower circulation pump (10) via a pipe, and the water washing tower circulation pump (10) is connected to the water washing spray device (12) via a water washing tower circulation pipe (11).

5. The multi-stage exhaust gas resource recovery system according to claim 1, characterized in that: The outlet of the first-stage falling film absorber (4) is connected to the first-stage circulation tank (13), and the outlet of the first-stage circulation tank (13) is connected to the first-stage falling film absorber (4) through the first-stage circulation pump (15). The outlet of the second-stage falling film absorber (5) is connected to the second-stage circulation tank (14), and the outlet of the second-stage circulation tank (14) is connected to the second-stage falling film absorber (5) through the second-stage circulation pump (16).

6. The multi-stage exhaust gas resource recovery system according to claim 1, characterized in that: The outlet at the bottom of the alkaline washing tower (6) is connected to an alkaline washing tower circulation pump (17) via a pipe, and the alkaline washing tower circulation pump (17) is connected to the alkaline washing spray device (19) via an alkaline washing tower circulation pipe (18).

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