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Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas

A technology for desulfurization, denitrification, mercury removal, and boiler flue gas, which is applied in the field of flue gas purification, can solve the problems of restricting flue gas purification engineering, sulfur oxides, nitrogen oxides and mercury are difficult to be removed at the same time, and achieve low cost and long-term The effect of high residence time and removal efficiency

Inactive Publication Date: 2007-05-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing dry process also has the disadvantage that it is difficult to remove sulfur oxides, nitrogen oxides and mercury at the same time. These problems restrict the implementation of large-scale flue gas purification projects.

Method used

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  • Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas
  • Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas
  • Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Take fly ash 60, hydrated lime 38.4, and sodium chlorite 1.6 by weight unit, add the above materials into the digester, add water to mix, stir at 40°C for 4.0 hours, centrifugal dehydration and drying to obtain The highly active absorbent. Among them, the median diameter of fly ash is about 24 μm, and that of slaked lime is about 6 μm.

Embodiment 2

[0035] Embodiment 2: Take fly ash 30, slaked lime 68.4, sodium chlorite 1.0, sodium chloride 0.6 by weight unit, add the above-mentioned materials in the digester, add water to mix, stir at 60 ℃ for 2.0 hours, centrifuge The highly active absorbent is obtained by dehydration and drying.

Embodiment 3

[0036] Example 3: Take fly ash 40, slaked lime 58.4, and calcium hypochlorite 1.6 by weight unit, add the above materials into the digester, add water to mix, stir at a temperature of 80°C for 1.0 hour, centrifugal dehydration and drying to obtain The highly active absorbent.

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PUM

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Abstract

The invention relates to a method for realizing desulfuration, denitration and demercuration of boiler smoke synchronously, wherein it comprises feeding smoke into cycle fluidize bed reactor, and injecting oxygen-enriched active absorber; said absorber is formed by coal ash at 20-70, lime hydrate at 27-80, additive at 0.5- 3 as kalii permangana KMnO4, sodium chlorite NaClO2, natrii chloridum NaCl, calcium hypochlorite Ca(ClO)2 or acetic hyctro peroxide CH3COOH. The invention's desulfuration efficiency can reach 90%, the denitration efficiency can reach 60%, and the demercuration can reach 50%, with low cost and non pollution.

Description

technical field [0001] The invention relates to an improved flue gas purification method and device, in particular to simultaneous desulfurization, denitrification, and mercury purification treatment for flue gas discharged from boiler combustion, and belongs to the technical field of flue gas purification. Background technique [0002] Harmful components such as sulfur oxides, nitrogen oxides, and mercury in boiler flue gas are discharged into the atmosphere, causing air quality to deteriorate. With the increasingly stringent environmental protection requirements, countries have stepped up efforts to control harmful gases such as sulfur dioxide and nitrogen oxides. It is foreseeable that heavy metals in flue gas, especially mercury pollution, will gradually be put on the agenda . Dust removal, desulfurization, denitrification and mercury removal in existing technologies at home and abroad are often completed separately in multiple independent systems, and rarely can be rem...

Claims

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Application Information

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IPC IPC(8): B01D53/60B01D53/64B01D53/83
Inventor 赵毅刘松涛于欢欢许佩瑶马双忱
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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