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System and method for wet absorption and regeneration recovery of sulfur dioxide

A sulfur dioxide, wet process technology, applied in chemical instruments and methods, separation methods, electrodialysis, etc., can solve the problems of low operating cost, demanding process conditions, low regeneration efficiency, etc. Harsh conditions and the effect of recycling

Pending Publication Date: 2021-06-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN101254392A heats the absorbed sodium bisulfite solution to thermally decompose it to generate sulfur dioxide and sodium sulfite, so as to achieve the purpose of enriching and recovering sulfur dioxide for deep utilization, but the system consumes a lot of energy in this method, and the evaporation and regeneration efficiency of sulfur dioxide is low; Patent CN101444699A improves evaporation efficiency through an improved three-effect evaporation and crystallization system, and combines electrolysis system to electrolyze sodium sulfate to generate sodium sulfite, sulfuric acid and sodium hydroxide, but there are still problems of high system energy consumption and low sulfur dioxide evaporation regeneration efficiency; patent CN106310943A uses hot steam and nitrogen combined gas lift as power, and adopts an air-lift large-flux internal circulation sulfur dioxide regeneration device to regenerate and recover sulfur dioxide from desulfurization liquid, which obviously reduces regeneration temperature and energy consumption, but the process conditions are relatively harsh, and the actual process operation Sulfur dioxide regeneration efficiency is still not ideal, only increased from 10% to less than 60%
[0005] Generally speaking, the traditional sodium sulfite-sodium bisulfite absorption system can efficiently absorb and remove sulfur dioxide in flue gas, with low operating cost and high efficiency, and the regeneration process after absorption can recycle sulfur dioxide, but the regeneration of sulfur dioxide evaporation requires High temperature and low pressure, relatively harsh conditions, high process energy consumption, and low enrichment and regeneration efficiency

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  • System and method for wet absorption and regeneration recovery of sulfur dioxide
  • System and method for wet absorption and regeneration recovery of sulfur dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment relates to a system and method for wet absorption and regeneration of sulfur dioxide, the system is as follows figure 1 Shown include:

[0040] Sulfur dioxide absorption tower 1, concentration regenerator 2, regulating tank 3, concentration tank 4, bipolar membrane electrodialysis device 5 connected in sequence, condenser 11 is communicated with concentration regeneration tank 2, and described bipolar membrane electrodialysis device 5 is provided with The alkali outlet and the acid outlet, wherein the alkali outlet is connected with the sulfur dioxide absorption tower 1, and the acid outlet is connected with the concentration regenerator 2. The adjustment tank 3 is also connected with the sulfur dioxide absorption tower 1, and the adjustment tank 3 is also provided with a concentrated water discharge port; the bipolar membrane electrodialysis device 5 is also provided with a dilute salt solution outlet, and the outlet communicates with the adjustment tan...

Embodiment 2

[0058] The purpose of this embodiment is to investigate and compare the electrodialysis effects of different groups of modules and voltages of bipolar membrane electrodialysis devices.

[0059] The device of Example 1 was used to process 0.2 mol / L sodium sulfate solution to produce acid, base and desalination. Using one set of membranes, under the condition of 5V voltage, the concentration of acid and alkali can reach 0.28mol / L and 0.26mol / L respectively within 2 hours, and the concentration of sodium sulfate can be reduced by 31.5%; the concentration of acid and alkali can reach 0.37mol / L respectively within 4 hours L and 0.31mol / L, the concentration of sodium sulfate decreased by 53.1%. Using 5 sets of membranes, under the condition of 10V voltage, the concentration of acid and alkali can reach 0.40mol / L and 0.34mol / L respectively within 1 hour, and the concentration of sodium sulfate is reduced by 73.0%. Using 10 sets of membranes, under the voltage condition of 17V, the c...

Embodiment 3

[0061] The purpose of this embodiment is to investigate and compare the influence of sodium hydroxide flow rate on the absorption rate of sulfur dioxide.

[0062] With 0.05mol / L Na 2 SO 3 The solution (100mL) was used as an absorbent to continuously absorb 2000ppm of SO in a water bath at 40°C 2 (0.6L / min, N2 as carrier gas), SO 2 The absorption and removal efficiency reaches 99.75%, and the absorption is saturated in 80 minutes, SO 2 The concentration returned to the inlet concentration. Feed 0.1 mol / L NaOH, SO 2 The concentration decreased rapidly, the absorption process continued, and the absorption efficiency reached 89.2%. With the increase of NaOH flow rate, SO 2 The absorption rate increases gradually, and when the NaOH flow rate reaches 0.6mL / min, the absorption rate reaches 96%. The NaOH flow rate continues to increase, and the effective absorption liquid in the absorption liquid is excessive and accumulates. After the NaOH addition was stopped, the accumulated...

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Abstract

The invention discloses a system and a method for wet absorption and regeneration recovery of sulfur dioxide. Sulfur dioxide in the flue gas is absorbed by using sodium sulfite; sulfur dioxide is enriched, separated out and recycled in the saturated absorption liquid regeneration process; and an oxidation by-product sodium sulfate in the absorption process is converted into alkali, acid and a dilute sodium sulfate salt solution by using a bipolar membrane electrodialysis method, the generated alkali enters a sulfur dioxide absorption tower to serve as absorption liquid to continuously absorb sulfur dioxide, the acid enters a concentration regenerator to react with sodium hydrogen sulfite to generate sulfur dioxide, and sulfur dioxide is enriched and recovered. Compared with a traditional technical method and process, on the basis of absorbing, removing, regenerating and recovering sulfur dioxide, the purpose of completely separating out and recovering sulfur dioxide under normal temperature and normal pressure conditions is achieved, the problems that a traditional recovery process is harsh in condition and low in efficiency, and an absorption liquid needs to be additionally supplemented in the absorption process are solved, the process cost is reduced, and the oxidized by-product sodium sulfate in the absorption process is re-utilized.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and in particular relates to a system and method for wet absorption and regeneration of sulfur dioxide. Background technique [0002] The power industry, metal smelting industry, and chemical industry have huge flue gas emissions, and sulfur dioxide is one of the most important pollutants. Sulfur dioxide (SO 2 ) is an important cause of environmental problems such as acid rain, and is also one of the most concerned air pollutants. Therefore, industrial flue gas must be desulfurized to meet the standard before it can be discharged. [0003] Flue gas desulfurization is mainly based on high-concentration acid production technology and low-concentration recovery method. There are many kinds of processes. According to the state of absorbent and desulfurization products in the desulfurization process, it can be divided into dry method, wet method and semi-dry method. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/96B01D61/46
CPCB01D53/504B01D53/78B01D53/965B01D61/445B01D61/46
Inventor 贾金平石峰应迪文李侃王亚林崔家华
Owner SHANGHAI JIAO TONG UNIV