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Method for reducing flue gas acidity of furnace

A flue gas, acidity technology, applied in separation methods, chemical instruments and methods, air quality improvement, etc., can solve problems such as facility politics

Inactive Publication Date: 2009-09-16
THE POWER IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

close to 40ppm of SO 3 Concentrations can cause severe adverse local acid problems, which, while not necessarily regulated, can cause local political problems at the facility

Method used

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  • Method for reducing flue gas acidity of furnace
  • Method for reducing flue gas acidity of furnace
  • Method for reducing flue gas acidity of furnace

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example

[0111] The following examples illustrate the results that can be achieved using the methods of the present invention. The method of the present invention was used in 3 different power plants to reduce flue gas acidity and acid dew point. because SO 3 is the main acid in coal furnace emissions, so the SO 3 Emissions are measured and used as indicators of acidity and dew point. The experimental data shown in Tables 1 and 2 were measured by a third-party company by using high-speed overfire air.

[0112] Table 1. Fractional Depth vs. SO in 2 Different Power Plants 3 level of impact.

[0113]

[0114] N / A - data not available; * - 98.5% of the sulfur in the hypothetical coal is converted to SO 2 and 1.5% of the sulfur in the coal is converted to SO 3 estimated on the basis of .

[0115] For the case of "shallow" staging, the overfire tuyeres are nearly closed, but still contain cooling flow (approximately 10% of the total air volume). For the case of "medium" classific...

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Abstract

A method for reducing acidity and lowering the acid dew point of flue gas, the method steps comprising: partially combusting the fuel in a first stage to create a reducing environment; maintaining the reducing environment for a sufficient period of time so that the available Reductive acid reduction to achieve a desired acid concentration in the flue gas; and combustion of the remainder of the fuel and combustion intermediates in a second stage with an oxidizing environment; thereby reducing the acid concentration of the flue gas Reduces acidity and lowers the acid dew point of the flue gas.

Description

technical field [0001] The present invention relates generally to a method for reducing by-product emissions from combustion reactions, and more particularly to a method of reducing the acidity of flue gases in a combustion furnace. Background technique [0002] reduced acidity [0003] Flue gases from power plants have long been considered a source of atmospheric pollution. During the combustion of fossil fuels, certain naturally occurring elements are oxidized to form (for example) SO 3 , NOx, HCl, HF and the like. If these acids (especially SO 3 ) concentrations above certain critical values ​​may cause problems. For example, when SO 3 When the concentration increases, the acid dew point temperature of the flue gas will increase. If the temperature of the flue gas is lower than the acid dew point temperature of the flue gas, the SO in the gas 3 will condense and react with water to form H 2 SO 4 , causing corrosion problems in the furnace. Also, the flue gas ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/34B01D53/40B01D53/50
CPCY02A50/20
Inventor 布赖恩·S·希金斯
Owner THE POWER IND GRP