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Flue gas desulfurization system and flue gas desulfurization method

A desulfurization system and flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as process pipeline blockage accidents, high energy consumption, and low competitiveness of sodium sulfite, so as to achieve economic benefits and reduce Effects of Environmental Pollution

Active Publication Date: 2020-06-19
NANJING UNIV OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the free alkali index, the traditional sodium sulfite production process involves evaporation, concentration and crystallization, which has high energy consumption per unit product and high production costs. Compared with other sulfites of the same family, the competitiveness of sodium sulfite in the market is relatively low
[0003] At the same time, the production process of sodium sulfite is different from that of the same family of sodium metabisulfite and sodium thiosulfate. The particle size of sodium sulfite crystals obtained by most evaporation crystallization systems is relatively small. After the slurry enters the centrifuge, the separation efficiency of the liquid and solid phases is low. , in order to reduce production costs, high-efficiency concentration measures are often taken to concentrate the relative density of sodium sulfite slurry to 1.72-1.95 through evaporation and crystallization, but frequent blockage accidents of process pipelines are not conducive to steady-state production

Method used

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  • Flue gas desulfurization system and flue gas desulfurization method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Flue gas desulfurization by-product sodium sulfite system using solid soda ash as sodium source. The main steps are as follows:

[0049] ① Alkali configuration and gas absorption. The sulfur-containing flue gas enters the lower part of the absorption tower (1) after being absorbed in the Venturi absorber (102) with the absorption liquid conveyed from the lower end of the absorption tower (101), and then flows between the lower end of the absorption tower (101) and the upper section of the absorption tower ( 103) Continue countercurrent absorption, and the absorbed tail gas (402) leaves the system from the top of the absorption tower; the lye in the lye tank is transported to the upper section of the absorption section (103), and the upper section of the absorption section (103) absorbs the absorption of the flue gas The liquid is transported to the lower part of the absorption tower (101), and the absorption liquid after the lower part of the absorption tower (101) abs...

Embodiment 2

[0063] Flue gas desulfurization by-product sodium sulfite system using solid caustic soda or sodium hydroxide powder as sodium source. The main steps are as follows:

[0064] ①Alkaline configuration. The sulfur-containing flue gas enters the lower part of the absorption tower (1) after being absorbed in the Venturi absorber (102) with the absorption liquid conveyed from the lower end of the absorption tower (101), and then flows between the lower end of the absorption tower (101) and the upper section of the absorption tower ( 103) Continue countercurrent absorption, and the absorbed tail gas (402) leaves the system from the top of the absorption tower; the lye in the lye tank is transported to the upper section of the absorption section (103), and the upper section of the absorption section (103) absorbs the absorption of the flue gas The liquid is transported to the lower part of the absorption tower (101), and the absorption liquid after the lower part of the absorption to...

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Abstract

The invention discloses a flue gas desulfurization system and a flue gas desulfurization method, and belongs to the field of chemical engineering. According to the method, sodium alkali is adopted asan absorbent to by-produce sulfates, the purity of a main product is controllable, the typical byproducts such as sodium sulfate, sodium sulfite, sodium metabisulfite and the like belong to a large number of commodities in the market and easily enter the commodity market, no solid waste or waste liquid is generated, and the environmental protection benefit is good. According to the invention, through reasonable process layout, sodium sulfite can be directly produced by intermittently bypassing the evaporative crystallization system, so that 20-50% of steam consumption can be saved under the same working medium; and the novel evaporative crystallizer is adopted, so that the operation flexibility of the evaporative crystallization system is improved, and the industrial problem that the evaporative crystallization system is frequently started and stopped and is high in energy consumption is solved.

Description

technical field [0001] The invention relates to the field of chemical equipment, in particular to a flue gas desulfurization system and method. Background technique [0002] Sulfite is an important reducing agent. Common sulfites in industry include sodium pyrosulfite, sodium sulfite, ammonium sulfite, sodium thiosulfate, potassium pyrosulfite and other products, among which sodium sulfite is the most important in the production of above-mentioned sulfite. Easily available products. In order to control the free alkali index, the traditional sodium sulfite production process involves evaporation, concentration and crystallization, which leads to high energy consumption per unit product and high production costs. Compared with other sulfites of the same family, sodium sulfite is relatively less competitive in the market. [0003] At the same time, the production process of sodium sulfite is different from that of the same family of sodium metabisulfite and sodium thiosulfate....

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/96C01D5/00C01D5/16C01D5/18
CPCB01D53/502B01D53/78B01D53/96C01D5/00C01D5/16C01D5/18B01D2258/0283B01D2251/304
Inventor 徐海涛徐延忠李明波
Owner NANJING UNIV OF TECH
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