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Method of removing sulfur trioxide from a flue gas stream

A flue gas and flue technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as low efficiency and frequent cleaning of process equipment

Active Publication Date: 2011-11-09
SOLVAY CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, many absorbent materials operate above about 400 sinters or melts at temperatures that make it less effective at removing gases
Reaction products of many absorbent substances also adhere to equipment and piping requiring frequent cleaning of process equipment

Method used

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  • Method of removing sulfur trioxide from a flue gas stream
  • Method of removing sulfur trioxide from a flue gas stream
  • Method of removing sulfur trioxide from a flue gas stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Will T-200 Trona at 367 Injection into the flue gas at the flue gas temperature. on SO 3 After about two weeks of system operation, the ESP perforated plates in the power plant had significant solids buildup.

Embodiment 2

[0045] Repeat the operation of embodiment 1, become at 365 Inject trona below flue gas temperature. Compared with the perforated plate of Example 1, using T-200 Trona in SO 3 After two weeks of system operation, the ESP perforated panels in the power plant were relatively free of solids buildup.

Embodiment 3

[0047] Repeat the operation of embodiment 1, become at about 500 Trona is injected into the flue gas at a temperature of Use T-200 Trona in SO 3 After two weeks of system operation, the ESP perforated panels in the power plant were relatively free of solids buildup.

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PUM

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Abstract

The present invention provides a method of removing SO3 from a flue gas stream, including providing a reaction compound selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, and mixtures thereof. The reaction compound is injected into the flue gas stream. The temperature of the flue gas is between about 500 DEG C and about 850 DEG C. The reaction compound is maintained in contact with the flue gas for a time sufficient to react a portion of the reaction compound with a portion of the SO3 to reduce the concentration of the SO3 in the flue gas stream.

Description

technical field [0001] The present invention relates to the purification of gases, and more particularly to a method for purifying gases containing harmful gases such as SO 3 way of flue gas. Background technique [0002] SO 3 It is a harmful gas produced by the combustion of sulfur-containing fuels. When SO 3 When present in the flue gas, acid fumes are formed which condense in electrostatic precipitators, ducts or dustbins, causing corrosion. The concentration of SO in the exhaust gas is as low as 5-10ppm 3 White, blue, purple or black plumes can also be produced as the hot flue gas cools in the cooler air in the atmosphere. [0003] NO reduction in coal-fired power plants by selective catalytic reactor (SCR) x Emissions efforts have resulted in undesired SO 2 is oxidized to SO 3 thus making SO 3 result in an increase in total emissions. After joining NH 3 In the case of SCR, a catalyst (typically vanadium pentoxide) is used to convert NO x converted to N 2 an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50
CPCB01D2257/302B01D2257/404Y10S423/05B01D53/508Y10S423/08B01D53/505
Inventor 小约翰·马久克
Owner SOLVAY CHEM INC