Sulfur-containing flue gas biochemical desulfurizing and sulfur recycling method

A sulfur recovery and flue gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of circulation path, process efficiency reduction, disadvantages and other problems that have not been mentioned in the biochemical treatment of effluent, and achieve material cost and operation Low cost, significant environmental benefits, and mild reaction conditions

Inactive Publication Date: 2019-07-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, there is also the problem of direct contact between the strongly acidic sulfur dioxide absorbing liquid and the sulfate-reducing bacteria seed liquid, which is not conducive to the efficient sulfate reduction process of the bacteria, resulting in a decrease in the overall process efficiency; at the same time, the patent does not mention To the circulation path for biochemical treatment effluent after flue gas leaching

Method used

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  • Sulfur-containing flue gas biochemical desulfurizing and sulfur recycling method

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Experimental program
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Effect test

Embodiment 1

[0042] Sulfur-containing flue gas produced by burning coal in a thermal power plant. Utilize the method of the present invention, the liquid-gas ratio of water leaching in the washing tank is 1, and the liquid-gas ratio of water rinsing in the absorption tank is 10, and the pH of sulfurous acid absorption liquid is 1~2.5 in the treatment process, and redox potential is 130~300mV; SRB biochemical treatment effluent pH is 5~6, redox potential is -400~-250mV; sulfur production conditions are controlled at pH 1~4, redox potential is -100~250mV, SO 3 2- / S 2- The molar ratio is 6:1 ~ 3:1; the method of sulfur separation adopts the air flotation method; the microorganisms used in the SRB biochemical reactor are 70% Desulfurization Enterobacter ( Desulfotomaculum ), 30% of Desulfomonas ( Desulfomonus ) composed of mixed flora. Under these conditions, the yield of sulfur was 42%, and the recovery rate of sulfur after air flotation separation was 85%.

Embodiment 2

[0044] Sulfur-containing flue gas produced by burning coal in a thermal power plant. Utilize the method of the present invention, the liquid-gas ratio of water leaching in the washing tank is 1, and the liquid-gas ratio of water rinsing in the absorption tank is 10, and the pH of sulfurous acid absorption liquid is 1~2.5 in the treatment process, and redox potential is 130~300mV; SRB biochemical treatment effluent pH is 5~6, redox potential is -400~-250mV; sulfur production conditions are controlled at pH 1~4, redox potential is -100~250mV, SO 3 2- / S 2- The molar ratio is 6:1 ~ 3:1; the method of sulfur separation adopts the air flotation method; the microorganisms used in the SRB biochemical reactor are 30% Desulfurization Enterobacter ( Desulfotomaculum ), 70% of Desulfomonas ( Desulfomonus ) composed of mixed flora. Under this condition, the yield of sulfur is 40%, and the recovery rate of sulfur after air flotation separation is 85%.

Embodiment 3

[0046] Sulfur-containing flue gas from a steel plant. Utilize the method of the present invention, the liquid-gas ratio of water leaching in the washing tank is 3, and the liquid-gas ratio of water rinsing in the absorption tank is 13, and the pH of sulfurous acid absorption liquid is 2~4 in the treatment process, and redox potential is 100~200mV; SRB biochemical treatment effluent pH is 6~7, redox potential is -300~-100mV; sulfur production conditions are controlled at pH 2~6, redox potential is -200~150mV, SO 3 2- / S 2- The molar ratio is 3:1~1:1; the method of sulfur separation adopts centrifugation; the microorganisms used in the SRB biochemical reactor are 20% Desulfovibrio ( Desulfovibrio ), 10% of Desulfoenterobacteriaceae ( Desulfotomaculum ), 50% of Desulfomonas ( Desulfomonus ), 10% of Desulfolobus ( Desulfobulbus ) composed of mixed flora. Under this condition, the yield of sulfur is 50%, and the recovery rate of sulfur after centrifugation is 99%.

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Abstract

The invention provides a sulfur-containing flue gas biochemical desulfurizing and sulfur recycling method and belongs to the field of gas treatment. The method includes: allowing sulfur-containing glue gas to enter a washing tank to remove impurities like dust and soluble salt in the flue gas after water leaching; allowing purified flue gas to enter an absorbing tank to obtain sulfinic acid absorbing liquid through leaching and absorbing; reducing SO32- and SO42- in solid-liquid separated backflow water to generate S2- by sulfate reducing bacteria in a biochemical reactor through biochemical reduction; guiding biochemical outgoing water and the sulfinic acid absorbing liquid into a physiochemical reactor, controlling reaction conditions, and allowing oxidative reduction comproportionationto obtain sulfur and sulfur-containing products (like S2O32-); guiding reaction outgoing water into a solid-liquid separation reactor, and performing solid-liquid separation on insoluble sulfur, soluble microbial metabolite and the sulfur-containing products to realize sulfur recycling; guiding part of solid-liquid separation outgoing water into the absorbing tank for leaching of sulfur-containingflue gas leaching, and guiding part of the same into the biochemical reactor to provide an electron receptor source for biochemical reduction of the sulfate reducing bacteria.

Description

technical field [0001] The invention belongs to the field of gas treatment, and in particular relates to a method for biochemical desulfurization and sulfur recovery of sulfur-containing flue gas. Background technique [0002] With the rapid development of industry, China is not only a big emitter of sulfur dioxide, but also a big importer of sulfur (mainly used for the production of sulfuric acid). The traditional flue gas desulfurization processes mainly include calcium desulfurization and ammonia desulfurization. The desulfurization gypsum produced by the calcium method lacks resource utilization value due to the heavy metal content, and its stacking takes up a lot of land; the ammonia desulfurization is caused by the high price of liquid ammonia. The operating cost is high, and the formation of smog is aggravated due to the phenomenon of ammonia escape. [0003] Sulfur dioxide flue gas is released from coal burning and sulfide ore smelting, and SRB can reduce sulfite an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/06B01D53/78B01D53/50C02F3/34C02F103/18C02F101/10
CPCB01D47/06B01D53/507B01D53/78B01D2257/91B01D2258/025C02F3/345C02F2101/101C02F2103/18
Inventor 胡学伟吴熙田森林黄建洪李英杰宁平赵群
Owner KUNMING UNIV OF SCI & TECH
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