Liquid purification or separation – Processes – Chemical treatment
Patent
1997-03-18
1999-11-02
Woo, Jay H.
Liquid purification or separation
Processes
Chemical treatment
210770, 210919, C02F 102
Patent
active
059763876
ABSTRACT:
A waste containing organic solids is fed into a boiler after it has been subjected to a hydrothermal reaction treatment in the presence of water. A slurry containing the waste is held under high-temperature and high-pressure conditions to cause a hydrothermal reaction such that an acidic slurry is formed during part of or throughout the process of the hydrothermal reaction. Thereby the content of oxygen in the waste relative to carbon atoms in building molecules of the waste is reduced. This concurrently causes removal of halogens in said building molecule and transferring the halogens into the slurry. The slurry then is cooled and dewatered and fed into a combustion section of the boiler. The waste slurry to be subjected to the hydrothermal reaction can be sorted into two portions for separate storage. One portion is a waste slurry the pH of which will increase as a result of the hydrothermal reaction. The other portion is a waste slurry the pH of which will decrease during the hydrothermal reaction. The two slurries are combined together and subjected to the hydrothermal reaction, with their relative amounts of supply being adjusted such as to form an acidic slurry either during part of or throughout the process of the hydrothermal reaction. Wastes can be supplied as a mass of high heat value into the boiler in such a manner that organic matter is transferred by a smaller amount into the aqueous phase during the hydrothermal reaction, and there is no scale deposit on the surfaces of those areas of the system components in contact with the liquid.
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Klosky, M., "Chlorine, Sulfer, and Soluble Slag Extraction with Energy Density Improvements of a MSW Slurry," Coal Util. Full Syst. The greening Coal, pp. 205-213, 1994.
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Higo Tsutomu
Kondo Kazuhiro
Serikawa Roberto Masahiro
Ebara Corporation
Morrison Betsey J.
Woo Jay H.
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