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A treatment method and device for flue gas containing sulfur dioxide

A technology for sulfur dioxide and treatment methods, which is applied in chemical instruments and methods, separation methods, multi-stage water treatment and other directions, can solve the problem that the removal effect of sulfur dioxide cannot be guaranteed, and achieve the effect of reducing treatment load, ensuring stable operation and improving economic benefits.

Active Publication Date: 2020-05-19
FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal effect of sulfur dioxide in the flue gas cannot be guaranteed by this method

Method used

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  • A treatment method and device for flue gas containing sulfur dioxide

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Embodiment 1

[0029] The process flow of the invention is adopted to treat the selenium-containing wastewater. Wastewater water quality is: pH is 7.3, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 3263.2μg / L, selenite ion (SeO 3 2- ) concentration was 2697.3μg / L, COD was 633mg / L, and ammonia nitrogen was 52.4 mg / L. The concentration of sulfur dioxide in the flue gas is 3170mg / m³.

[0030] A two-stage gas-liquid contact desulfurization tower is adopted, and the sulfur dioxide-containing flue gas part enters the first-stage reactor, and reacts with the selenium-containing wastewater discharged from the acidification reactor, and the liquid-gas volume ratio is controlled to be 0.3L / m 3 , to remove selenite ions; the flue gas discharged from the first stage reactor is mixed with the remaining part of the flue gas and then enters the second stage reactor to directly react with selenium-containing wastewater, and the liquid-gas volume r...

Embodiment 2

[0033] The method of the invention is used to treat the selenium-containing wastewater. Wastewater water quality: pH is 6.7, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 21228.3μg / L, selenite ion (SeO 3 2- ) concentration was 12757.7μg / L, COD: 682mg / L, ammonia nitrogen: 73.3 mg / L. The concentration of sulfur dioxide in the flue gas is 8630mg / m³.

[0034] A two-stage gas-liquid contact desulfurization tower is adopted, and the sulfur dioxide-containing flue gas part enters the first-stage reactor, and reacts with the selenium-containing wastewater discharged from the acidification reactor, and the liquid-gas volume ratio is controlled to be 0.5L / m 3 , to remove selenite ions; the flue gas discharged from the first stage reactor is mixed with the remaining part of the flue gas and then enters the second stage reactor to directly react with selenium-containing wastewater, and the liquid-gas volume ratio is controlled t...

Embodiment 3

[0037] Treatment process and operating conditions are the same as in Example 2. The difference is that in the acidification reactor, a mixed solution of 50g / L thiourea and 50g / L ascorbic acid is added to the hydrochloric acid solution. After treatment, the removal rate of total selenium reached 95.2%, the removal rate of COD was 91.4%, and the removal rate of ammonia nitrogen was 90.1%. The removal rate of sulfur dioxide in flue gas is 99.4%.

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Abstract

The invention relates to a treatment method for SO2-containing flue gas and a treatment device. A double-section flue gas desulfurization reactor is adopted, the flue gas enters the first-section reactor and is subjected to a reaction with Se-containing wastewater discharged by an acidification reactor, and selenite ions are removed; the flue gas enters the second-section reactor and is directly subjected to a reaction with the Se-containing wastewater, SO2 in the flue gas is removed, and purified gas is discharged; effluent of the second-section reactor enters the acidification reactor, acidification pH is controlled at 2-6, and selenate ions are reduced into the selenite ions; effluent of the acidification reactor enters the first-section reactor and is subjected to a reaction with the flue gas, and the selenite ions are removed; effluent of the first-section reactor enters an aerobic reactor, and ammonia nitrogen, COD and remaining Se pollutants in the wastewater are removed; effluent of the aerobic reactor enters a flocculating sedimentation tank for treatment. The Se-containing wastewater is taken as a desulfurization absorption liquid, so that the Se-containing wastewater andthe SO2-containing flue gas are treated efficiently simultaneously, waste is treated by waste, and the economic benefits are increased greatly.

Description

technical field [0001] The invention belongs to the technical field of environmental protection waste gas treatment, and in particular relates to a treatment method and device for flue gas containing sulfur dioxide. Background technique [0002] Sulfur dioxide, as the most common and simplest sulfur oxide, is one of the main pollutants in the atmosphere. Since coal and petroleum usually contain sulfur, flue gases containing sulfur dioxide are produced in many industrial processes such as coal-fired power plants, oil refineries and metal smelters. Sulfur dioxide will cause serious harm to human health. At the same time, it is also an important source of acid rain, which has a serious impact and damage on the earth's ecological environment and human society and economy. [0003] There are many ways to control sulfur dioxide in flue gas, among which the most economical and effective method is flue gas desulfurization. At present, flue gas desulfurization technology can be div...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50C02F9/14C01B19/02
CPCB01D53/50B01D53/78C01B19/02C02F1/5236C02F1/56C02F1/58C02F3/1236C02F3/1263C02F3/1268C02F9/00C02F2101/106C02F2101/16C02F2301/08
Inventor 周彤许莹
Owner FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP
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