[특허]Energy efficient filtration of syngas cooling and scrubbing water

Energy efficient filtration of syngas cooling and scrubbing water 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C10J-003/46
출원번호	US-0136149 (1993-10-15)
발명자 / 주소	Hilton Joanne L. (Houston TX) Seuffert Frederick B. (Houston TX) Reich Erwin A. (Stamford CT)
출원인 / 주소	Texaco Inc. (White Plains NY 02)
인용정보	피인용 횟수 : 47 인용 특허 : 0

초록 ▼

A partial oxidation process for the production of a stream of cooled and cleaned synthesis gas, reducing gas, or fuel gas substantially free from entrained particulate matter and slag. The hot raw gas stream from the partial oxidation gas generator is quench cooled with deaerated grey water in a quench tank to produce black quench water or cooled in a radiant and/or convection cooler. The cooled gas is scrubbed with deaerated grey water in a scrubbing zone to remove all of the entrained particulate matter and to produce black scrubbing waters. The black water is resolved in a flashing zone and reused by flashing it in two or three flash stages connected in series and separating the overhead flash vapors comprising vaporized grey water and sour gas from the bottoms comprising concentrated black water. The flash vapors from the first flash stage are used to heat a stream of deaerated grey water being recycled to the quench tank and gas scrubbing zone or to the gas scrubbing zone. The concentrated black water from the flashing zone is thickened in a clarifier and then filtered to produce filter cake which may be burned and grey water filtrate. The flash vapors from the second flash stage and optionally steam are introduced into a deaerator to strip dissolved oxygen from incoming make-up water, grey water condensate, and grey water filtrate. In another embodiment of the process, the flash zone comprises three flash stages.

대표청구항 ▼

A process for the partial oxidation of a liquid hydrocarbonaceous fuel or an aqueous slurry of solid carbonaceous fuel comprising: (1) reacting by partial oxidation a liquid hydrocarbonaceous fuel or an aqueous slurry of solid carbonaceous fuel with a free-oxygen containing gas in the presence of a temperature moderator to produce a hot raw gas stream comprising H2, CO, CO2, H2O; entrained particulate matter comprising particulate carbon and ash; and at least one material selected from the group consisting of N2, Ar, H2S, COS, CH4, NH3, HCN, HCOOH, and slag; (2) cooling the hot raw gas stream from (1) by (a) direct contact with quench water in a gas quenching zone thereby producing a pumpable stream of black quench water, or by (b) indirect heat exchange with water in a gas cooling zone; (3) scrubbing in a gas scrubbing zone the cooled hot raw gas stream from (2) with a deaerated grey water to remove substantially all of the remaining entrained particulate matter in said raw gas stream, and producing black scrubbing water; (4) introducing said black quench water from (2) (a) and said black scrubbing water from (3) into a flash zone wherein the pressure is dropped by flashing thereby producing flash vapor comprising vaporized grey water and a sour gas; and a separate bottoms stream of flashed black water whose solids content is greater than the solids content of said black scrubbing water in (3); (5) passing a first portion of said flash vapor from (4) through a heat exchange zone in indirect heat exchange with a stream of deaerated grey water, thereby simultaneously heating said deaerated gray water and condensing grey water from the cooled flash vapor, and separating sour gas from said condensed grey water; (6) introducing a second portion of said flash vapor from (4) and said condensed grey water from (5) into a deaerating zone, deaerating said condensed grey water, and recycling by way of said heat exchange zone in (5) at least a portion of the deaerated grey water to the gas quenching zone in (2)(a) and the gas scrubbing zone in (3) for the gas quenching mode in (2)(a) or to the gas scrubbing zone in (3) for the gas cooling mode in (2)(b); (7) clarifying the flashed black water from (4) in a clarifying zone to produce grey water and a bottoms stream of concentrated black water; (8) filtering the stream of concentrated black water from (7) to produce filter cake and grey water filtrate; and (9) deaerating the grey water produced in (7) and (8) in said deaerating zone, and recycling by way of said heat exchange zone in (5) at least a portion of the deaerated grey water to said gas quenching zone in (2)(a) and the gas scrubbing zone in (3) for the gas quenching mode in (2)(a) or to the gas scrubbing zone in (3) for the gas cooling mode in (2)(b).

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