[특허]Process for removing NOx <B>and SOx <B>from exhaust gas

Process for removing NOx and SOx from exhaust gas 원문보기

IPC분류정보

국가/구분 United States(US) Patent 등록

국제특허분류(IPC7판)

C01B-021/00

C01B-017/00

출원번호 US-0751728 (1991-08-29)

발명자 / 주소

Skelley Arthur P. (Pittsburgh PA) McMichael James C. (Monroeville PA) Cobb

Jr. James T. (Pittsburgh PA) Rohrer

Jr. Wesley M. (Pittsburgh PA) Custer

II Phillip E. (Pittsburgh PA) Elsubki Taha M.

출원인 / 주소

Cannon Boiler Works, Inc. (New Kensington PA 02)

인용정보 피인용 횟수 : 28 인용 특허 : 0

초록 ▼

Exhaust gases containing oxides of nitrogen and sulfur from a fired process heater, a fossil fuel fired boiler, or a chemical process are diverted from a stack prior to admission to the atmosphere through a duct system containing heat exchangers that reduce the exhaust gas from an elevated temperatu

Exhaust gases containing oxides of nitrogen and sulfur from a fired process heater, a fossil fuel fired boiler, or a chemical process are diverted from a stack prior to admission to the atmosphere through a duct system containing heat exchangers that reduce the exhaust gas from an elevated temperature, if any, to about ambient temperature. Any heat extracted from the exhaust gas may be transferred to the boiler feed water which would serve to reduce the energy cost of operating a boiler. Once the exhaust gas is cooled to about ambient temperature, the gas is then mixed with an oxidant, such as ozone, at a preselected molar ratio to transform the oxides to higher orders of nitrogen and sulfur oxides to increase the absorbability of the nitrogen and sulfur oxides in a reagent solution. The reagent absorbs the oxidized contaminants from the exhaust gas. The oxides are transformed to dilute acids which are then neutralized to form salts that are acceptable for discharge to a municipal waste water treatment plant. The treated exhaust gas is then emitted from an exhaust stack containing contaminants at a level meeting air quality standards. Additionally any heat recovered from the exhaust gas can be used to lower operating costs.

대표청구항 ▼

A process for removing nitrogen and sulfur oxide contaminants from exhaust gas comprising the steps of, directing exhaust gas containing nitrogen and sulfur oxide contaminants at an elevated temperature from a process system to an exhaust duct, conveying the contaminated exhaust gas through a series

A process for removing nitrogen and sulfur oxide contaminants from exhaust gas comprising the steps of, directing exhaust gas containing nitrogen and sulfur oxide contaminants at an elevated temperature from a process system to an exhaust duct, conveying the contaminated exhaust gas through a series of heat exchangers in the exhaust duct to reduce and control the temperature of the contaminated exhaust gas, reducing the temperature of the exhaust gas from an elevated temperature to about ambient temperature, removing moisture from the exhaust gas by condensing water vapor present in the exhaust gas by rapidly lowering the temperature of the exhaust gas, mixing the exhaust gas in a reaction chamber with ozone in a molar ratio of at least 1.5 moles of ozone to each mole of nitrogen and sulfur oxides to oxidize the contaminants in the exhaust gas and increase the absorbability of the nitrogen and sulfur oxides in water, maintaining the exhaust gas in contact with the ozone in the reaction chamber for a preselected residence time, monitoring the residence time of mixing the exhaust gas with the ozone in the reaction chamber to assure substantially complete conversion of all the nitrogen and sulfur oxides in the exhaust gas to N2O5 and higher order sulfur oxides and substantially complete consumption of all of the ozone in the reaction chamber so that exhaust gas substantially containing N2O5 and free of ozone is emitted from the reaction chamber, introducing the oxidized contaminants substantially containing N2O5 higher order sulfur oxides in the exhaust gas at about ambient temperature into a combination spray/absorption chamber, generating a mist-like spray of water in the spray/absorption chamber, admixing the exhaust gas containing substantially N2O5 with the water mist to transform N2O5 and sulfur oxides to dilute acids including HNO3 and H2SO4, absorbing the admixture of water mist containing the dilute acids including HNO3 and H2SO4 in the exhaust gas into liquid water, converting the dilute acids to solids including nitrates and sulfates containing the contaminants removed from the exhaust gas in the spray/absorption chamber, and thereafter discharging the exhaust gas at about ambient temperature and substantially free of the contaminants from the exhaust duct.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Process for removing NOx and SOx from exhaust gas 원문보기

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국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C01B-021/00 C01B-017/00
출원번호	US-0751728 (1991-08-29)
발명자 / 주소	Skelley Arthur P. (Pittsburgh PA) McMichael James C. (Monroeville PA) Cobb Jr. James T. (Pittsburgh PA) Rohrer Jr. Wesley M. (Pittsburgh PA) Custer II Phillip E. (Pittsburgh PA) Elsubki Taha M.
출원인 / 주소	Cannon Boiler Works, Inc. (New Kensington PA 02)
인용정보	피인용 횟수 : 28 인용 특허 : 0

내보내기 구분	파일저장 인쇄 메일전송
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안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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Process for removing NOx and SOx from exhaust gas 원문보기

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