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Publication Date: 2014-Aug-27
Document File: 3 page(s) / 54K

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The Prior Art Database


This invention is an integrated solution to control a gasification reaction by actively cooling the initial segments of the gasification vessel, wherein a superheated gas is formed then and controlling the outlet temperature and moisture content of syngas by moderating with attemperation syngas formed in the primary stages.

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The problem solved by this disclosure is the precise control of the composition of syngas from the exit of the gasifier while providing controlled cooling. The controlled cooling, in internal or external cooling segments, creates steam (and/or superheated steam) while using a refractory lined pressure vessel.  The initial segment is where the primary fuel and oxidant are mixed and reacted. The primary fuel may contact a mixture of coal, coke, other solid, liquid hydrocarbon, biomass, hydrocarbon gas, or a combination mixture of these. Some of the primary fuel may be recycled.

GASIFIER SEGMENT(s): In one embodiment, there may be an optional additional fuel, oxidant, or recycle CO2 stream added between gasification segments. Each segment is defined as having unique cooling configurations as shown in the figure attached.

COOLING SEGMENTS(s): The cooling segments, or stages, may be contained inside of the refractory lined gasifier or externally mounted. There may be as few as 2 cooling segments.

EXIT SYNGAS/STEAM Quench: At the gasifier exit, the hot syngas from the exit of the gasification vessel is mixed with cooled syngas which can be raw or cleaned prior to mixing. In addition, superheated or saturated steam may be introduction at the exit. The introduction of the cooled syngas and/or superheated or saturated steam is done by the use of swirling spray nozzles. The swirling nozzles cause the flow to circulate and mix. If the exit syngas contains solids, some of the solids are captured by a flow of water along the wall of the lower syngas quench section of the vessel. The water on the wall flows into a sump where the solids are combined with slag that has dripped from the gasifier refractory wall. Alternatively, the syngas/steam quench can be integrated with a standard quench design.

The particular embodiment shown in the attachment includes 2 stages, or segments, of gasification where the first segment is cooled by an evaporating section of water. The second segment is cooled by a superheating section of that steam; this may be in combination with partial cooling as in the first s...