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CN-121988138-A - Parallel acid separation system of pyrite multistage absorption tower

CN121988138ACN 121988138 ACN121988138 ACN 121988138ACN-121988138-A

Abstract

The application relates to a parallel acid distribution system of a pyrite multistage absorption tower, which comprises a drying tower, at least two absorption towers which are arranged in series, a gas pipeline system and an acid liquor circulation and distribution system, wherein the gas pipeline system is used for sequentially conveying flue gas at an outlet of the drying tower to each absorption tower, the acid liquor circulation and distribution system comprises a serial distribution link for sequentially conveying acid liquor of the drying tower to each absorption tower, parallel acid distribution pipelines which are connected to a plurality of absorption towers and are used for conveying the acid liquor, and self-circulation acid liquor structures which are respectively arranged in the drying tower and the absorption towers, the serial distribution link comprises an electronic control valve, a high acid value pipeline and a low acid value pipeline, and the self-circulation acid liquor structure comprises an atomizing nozzle which is connected to the inner wall of the drying tower/the absorption tower through a connecting frame. The acid liquor dynamic optimization configuration method has the advantages that the series distribution, the parallel distribution and the self-circulation coordination are realized, the acid liquor dynamic optimization configuration is realized, and the adaptability and the stability of the system are improved.

Inventors

  • DING JIANYA
  • GENG HEPING
  • WU YUQING

Assignees

  • 常州市永祥化工有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (8)

  1. 1. A parallel acid separation system of a pyrite multistage absorption tower, comprising: a drying tower (1), at least two absorption towers (2) arranged in series; A gas pipeline system (3) for sequentially conveying the flue gas at the outlet of the drying tower (1) to each absorption tower (2); The acid liquor circulation and distribution system (4) comprises a serial distribution link (6) for sequentially conveying the acid liquor of the drying towers (1) to each absorption tower (2), parallel acid distribution pipelines (7) connected to a plurality of absorption towers (2) and used for conveying the acid liquor, and self-circulation acid liquor structures (8) respectively arranged in the drying towers (1) and the absorption towers (2); Wherein the serial distribution link (6) comprises an electronic control valve (9), and a high acid value pipeline (10) and a low acid value pipeline (11) which are respectively connected to the different absorption towers (2); The self-circulation acid liquor structure (8) comprises an atomizing nozzle (12) connected to the inner wall of the drying tower (1)/the absorption tower (2) through a connecting frame, and a first connecting pipe (13) connected to the outer wall of the drying tower (1)/the absorption tower (2), wherein one end of the first connecting pipe (13) is connected to the atomizing nozzle (12) in a communicating way, the other end of the first connecting pipe is connected to the outer wall of the drying tower (1)/the absorption tower (2) in a communicating way, and a first driving pump (14) is connected to the first connecting pipe (13).
  2. 2. The parallel acid separation system of the pyrite multistage absorption towers according to claim 1, wherein the gas pipeline system (3) comprises a first gas pipe (15) which is used for connecting the drying towers (1) and one of the absorption towers (2) in a communicating way, two adjacent absorption towers (2) are connected through a second gas pipe (16), a third gas pipe (17) is connected to the absorption tower (2) positioned at the tail position, an air inlet pipe (18) is fixedly connected to the drying towers (1), and a cyclone separator (19) is fixedly connected to the other end of the air inlet pipe (18).
  3. 3. The parallel acid separation system of the pyrite multistage absorption tower according to claim 1, wherein the serial distribution link (6) comprises a second connecting pipe (20) fixedly connected to the drying tower (1), the other end of the second connecting pipe (20) is fixedly connected with a second driving pump (21), one end, far away from the second connecting pipe (20), of the second driving pump (21) is fixedly connected with a third connecting pipe (22), a first one-way valve (23) is fixedly connected to the third connecting pipe (22), and the other end of the third connecting pipe (22) is fixedly connected with the electronic control valve (9).
  4. 4. The parallel acid separation system of the pyrite multistage absorption tower according to claim 3, wherein the high acid value pipeline (10) and the low acid value pipeline (11) are respectively and fixedly connected to different output ports of the electronic control valve (9), the other end of the high acid value pipeline (10) is connected to a first absorption tower (2) at the downstream of the drying tower (1) in a communicating manner, and the other end of the low acid value pipeline (11) is connected to a second absorption tower (2) in a communicating manner.
  5. 5. The parallel acid separation system of the multi-stage pyrite absorption tower according to claim 1, wherein the drying tower (1) is further connected with an acid supplementing device (24), the acid supplementing device (24) comprises a first acid inlet pipe (25) fixedly connected to the outer wall of the drying tower (1), one end of the first acid inlet pipe (25) located in the drying tower (1) is fixedly connected to an atomizing nozzle (12) in the drying tower (1), the other end of the first acid inlet pipe (25) is fixedly connected with a third driving pump (26), the other end of the third driving pump (26) is fixedly connected with a second acid inlet pipe (27), and the other end of the second acid inlet pipe (27) is fixedly connected with an acid liquor tank (28).
  6. 6. The parallel acid separation system of the pyrite multistage absorption towers according to claim 1, wherein the parallel acid separation pipeline (7) comprises a tapping pipe (29) which is communicated and connected with two adjacent absorption towers (2), and a fourth driving pump (30) and a second one-way valve (31) are connected to the tapping pipe (29).
  7. 7. The parallel acid separation system of the multi-stage absorber of the pyrite according to claim 3, further comprising an acid value detection system (32) comprising an acid value detector (33) connected to the inner walls of the drying tower (1) and the absorber (2), an acid value detector (34) connected to the outer wall of the third connecting pipe (22), and a controller (35) electrically connected to the acid value detector (33) and the acid value detector (34), respectively.
  8. 8. The parallel acid separation system of the pyrite multistage absorption tower according to claim 1, wherein a funnel-shaped guide plate (5) is fixedly connected to the inner wall of the drying tower (1) and/or the inner wall of the absorption tower (2), and the atomizing nozzle (12) points to a hollow part in the middle of the guide plate (5).

Description

Parallel acid separation system of pyrite multistage absorption tower Technical Field The application relates to the technical field of flue gas desulfurization and purification, in particular to a parallel acid separation system of a pyrite multistage absorption tower. Background Currently, in pyrite firing acids or similar sulfur-containing flue gas cleaning processes, flue gas is generally treated with a "dry-absorption" multi-stage tower system. The absorption link adopts two or three stages of absorption towers in series connection to gradually remove sulfur dioxide in the flue gas. In the system, the acid liquor circulation and distribution mode directly affects the process efficiency and the system operation stability of each stage of absorption towers. In the related art, it is common practice to design the acid liquor circulation system of each stage of absorption tower as a relatively independent unit, or to adopt a simple serial liquid supply mode, i.e. part of the circulating acid liquor of the upper stage of absorption tower overflows or is pumped to the lower stage of absorption tower. The mode has simple structure, but has obvious limitations that firstly, the concentration of the acid liquid at the inlet of each stage of absorption tower is difficult to independently and accurately adjust according to different process requirements of each stage of absorption tower, and secondly, when the working condition of one stage of absorption tower changes, the system lacks a means for rapidly and flexibly adjusting the acid liquid between each stage of absorption towers, and the response is slow, so that the overall desulfurization efficiency is possibly reduced or the operation is unstable. Aiming at the related technology, the inventor considers that the existing system has stronger acid liquor distribution strategy rigidity, can not realize dynamic optimal configuration of acid liquor resources in the multistage absorption process, is difficult to consider the optimal technological conditions of absorption towers at all stages, and limits the further improvement of the overall efficiency of the system and the adaptability to complex working conditions. Disclosure of Invention In order to solve the problems of inflexible distribution of acid liquor among the multistage absorption towers and insufficient concentration regulation and control precision in the prior art, the application provides a parallel acid distribution system of a pyrite multistage absorption tower. The parallel acid separation system of the pyrite multistage absorption tower provided by the application adopts the following technical scheme: A parallel acid separation system of a pyrite multistage absorption tower, comprising: a drying tower, at least two absorption towers arranged in series; The gas pipeline system is used for sequentially conveying the flue gas at the outlet of the drying tower to each absorption tower; The acid liquor circulation and distribution system comprises serial distribution links for sequentially conveying the acid liquor of the drying towers to each absorption tower, parallel acid distribution pipelines connected to a plurality of absorption towers and used for conveying the acid liquor, and self-circulation acid liquor structures respectively arranged in the drying towers and the absorption towers; the serial distribution link comprises an electronic control valve, and a high acid value pipeline and a low acid value pipeline which are respectively connected to different absorption towers; The self-circulation acid liquor structure comprises an atomization spray nozzle connected to the inner wall of the drying tower/absorption tower through a connecting frame, and a first connecting pipe connected to the outer wall of the drying tower/absorption tower, wherein one end of the first connecting pipe is connected to the atomization spray nozzle in a communicating manner, the other end of the first connecting pipe is connected to the outer wall of the drying tower/absorption tower in a communicating manner, and a first driving pump is connected to the first connecting pipe. By adopting the technical scheme, the system constructs a set of acid liquor flow framework integrating serial distribution, parallel distribution and self-circulation in the tower. The circulating acid liquor from the drying towers can be used as a common acid source, and is distributed as required through electronic control valves in a series distribution link, and the absorption liquid with set concentration is respectively supplied to absorption towers of different levels in a parallel connection mode through independent high and low acid value pipelines. At the same time, the self-circulating acid liquor structure inside each tower maintains the basic spray absorption process. The design realizes the flexible configuration of concentrated supply, directional distribution and graded utilization of acid liquor resources in the system