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Sulfur trioxide removal from a flue gas stream

A flue gas and flue technology, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of frequent cleaning of process equipment, low efficiency, adhesion, etc.

Active Publication Date: 2008-09-10
SOLVAY CHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, many absorbent materials sinter or melt at temperatures above about 400°F, making them less effective at removing gases
Another problem is that under certain temperature and gas concentration conditions, the reaction products of many absorbent substances adhere to equipment and piping, which requires frequent cleaning of process equipment

Method used

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  • Sulfur trioxide removal from a flue gas stream
  • Sulfur trioxide removal from a flue gas stream

Examples

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Embodiment Construction

[0039] A hot-side electrostatic precipitator (ESP) is employed in the power plant and no baghouse is used. The device removes NO using x catalyst, causing SO in the flue gas 3 level up. SO in flue gas 3 The concentration is from about 100 ppm to about 125 ppm. Jet from Solvay Chemicals Trona to remove SO from flue gas 3 .

[0040] As a comparative example, no additives were used, and trona was sprayed at 400°F with an NSR of about 1.5. The ESP perforated plates in this unit showed significant solids buildup and required frequent cleaning.

[0041] An absorbent composition comprising trona and 1% calcium carbonate was sprayed into the flue gas at 400°F with an NSR of about 1.5. in operation SO 3 The ESP perforated plates in this unit were relatively free of solids buildup after removal from the system.

[0042] The use of additives according to the present invention reduces the SO 3 The amount of sticky waste that is removed from the process.

[0043] The embodimen...

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Abstract

A method of removing SO3 from a flue gas stream having increased amounts of SO3 formed by a NOx removal system, includes injecting a sorbent composition into the flue gas stream. The sorbent composition includes an additive and a sodium sorbent such as mechanically refined trona or sodium bicarbonate. The additive is selected magnesium carbonate, calcium carbonate, magnesium hydroxide, calcium hydroxide, and mixtures thereof. The concentration of the SO3 in the flue gas stream is reduced and the formation of a liquid phase NaHSO4 reaction product is minimized.

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, purple or black plumes can also be produced as the hot flue gas cools in the cooler air of 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 and H 2...

Claims

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Application Information

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IPC IPC(8): B01D53/50
CPCB01D53/508
Inventor 约翰・马久克拉西科・赖塔塔
Owner SOLVAY CHEM INC
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