Flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption

A pre-oxidation, gas-phase technology, applied in the field of flue gas purification, can solve problems such as failure to meet emission standards, low removal efficiency, chloride ion corrosion, etc., achieve good environmental and economic benefits, and broad application prospects

Active Publication Date: 2015-11-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet technology is mainly divided into wet oxidation method and wet complexation absorption method. Wet technology has the advantages of high removal efficiency, strong adaptability to coal types and stable operation, but there are also problems of chloride ion corrosion, wastewater treatment, energy consumption and operation relatively high cost
Dry technology has the advantages of no wastewater treatment, but has disadvantages such as poor system operation stability, low removal efficiency, and inability to meet existing discharge standards.

Method used

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  • Flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption
  • Flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption
  • Flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Preparation of liquid-phase composite oxidant mother liquor: wherein the concentration %wt ratio of hydrogen peroxide and sodium chlorite is 25:1, after mixing the two according to the above concentration ratio, dilute it to the mother liquor concentration with process water, and the pH is 4.5.

[0093] The above-mentioned liquid-phase composite oxidant is injected into the gas-phase reagent generating device, and after passing through the pre-oxidizer and the wet absorption tower, the integrated desulfurization, denitrification and demercuration are realized. The reaction conditions are shown in Table 2.

[0094] Table 2 Reaction Conditions

[0095] condition

[0096] According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 99%, the denitrification efficiency is 90.5%, and the mercury removal efficiency is over 92.7%.

Embodiment 2

[0098] Preparation of composite oxidant: wherein the concentration %wt ratio of hydrogen peroxide and sodium chlorite is 30:0.5, after mixing the two according to the above concentration ratio, dilute it to the mother liquor concentration with process water, and the pH is 5.7.

[0099] The above-mentioned liquid-phase composite oxidant is injected into the gas-phase reagent generating device, and after passing through the pre-oxidizer and the wet absorption tower, the integrated desulfurization, denitrification and demercuration are realized. The reaction conditions are shown in Table 3.

[0100] Table 3 reaction conditions

[0101] condition

[0102] According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 100%, the denitrification efficiency is 89.2%, and the mercury removal efficiency is over 93.3%.

Embodiment 3

[0104] Prepare composite oxidant: the concentration %wt ratio of sodium chlorite and sodium persulfate is 2:4. After mixing the two according to the above concentration ratio, use process water to dilute it to the mother liquor concentration, and the pH is 10.

[0105] The above-mentioned liquid-phase composite oxidant is injected into the gas-phase reagent generating device, and after passing through the pre-oxidizer and the wet absorption tower, the integrated desulfurization, denitrification and demercuration are realized. The reaction conditions are shown in Table 4.

[0106] Table 4 reaction conditions

[0107] condition

[0108] According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 100%, the denitrification efficiency is 92.0%, and the mercury removal efficiency is over 94.8%.

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Abstract

The invention belongs to the technical field of flue gas purification, and particularly relates to a flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption. The system comprises a gas-like phase reagent generating device, a preoxidation device and an absorption tower. The removal method comprises the following steps that 1, a gas-like phase composite oxidant is prepared; 2, a preoxidation reaction is performed, wherein the gas-like phase composite oxidant is utilized to efficiently oxidize NO and Hg<0> in a gas phase; 3, an absorption reaction is performed, wherein mixed liquor of sodium humate and ammonia water serves as absorption seriflux to absorb and remove SOx, NOx and Hg<2+> in oxidation products. According to the flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption, the two-level arrangement mode of combining preoxidation with absorption is adopted to perform integration removal on multiple pollutants of coal-fired flue gas, and therefore the problems that in an existing hierarchical arrangement mode, a system is complex, the floor space is large, and the operating cost is slightly high are solved; the desulfuration, denitration and mercury removal efficiency can meet the current pollutant discharge standard, a removal product is sulphureous and nitrogenous compound fertilizer, and higher economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an integrated flue gas removal system and method combined with gas-phase pre-oxidation combined with absorption. Background technique [0002] Particulate matter and SO from coal combustion 2 , NO x and trace heavy metals (Hg 0 ) is one of the causes of frequent smog in my country, which poses a serious threat to human life and health and sustainable ecological development. Therefore, the control of coal-fired flue gas pollutants is imminent. The existing desulfurization, denitrification and mercury removal systems in thermal power plants are wet limestone-gypsum system (WFGD), selective catalytic reduction system (SCR) and activated carbon injection system (ACI). , System complexity and high operating costs. Therefore, research and development of a new process for simultaneous desulfurization, denitrification and mercury removal of flue gas with low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/80B01D53/60B01D53/64
CPCY02A50/20
Inventor 赵毅郝润龙周思涵郭天祥杨硕
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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