HRSG for fluidized gasification
AssigneeSynthesis Energy Systems, Inc.
InventorsMinghai Gu, Songliang Sun, Guangliang Luo
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Abstract
An HRSG for fluidized bed gasification comprises a high temperature evaporator (200), a superheater (300), a low temperature evaporator (400), and an economizer (500) connected in series. The superheater (300), the low temperature evaporator (400) and the economizer (500) have a water-tube structure, and the high temperature evaporator (200) has a fire-tube structure. The HRSG of the present invention allows efficient heat recovery from the raw syngas of a fluidized bed coal gasifier, while avoids or reduces the corrosion of and damage to the components of the HRSG caused by high-speed ash particles in the syngas.
Claims7
A heat recovery steam generator (HRSG) for fluidized bed gasification,
- wherein the HRSG comprises from top to bottom a raw syngas inlet, a high temperature evaporator, a superheater, a low temperature evaporator and an economizer connected vertically in series,
- wherein each of the superheater, the low temperature evaporator and the economizer comprises a water-tube structure, and the high temperature evaporator comprises a fire-tube structure;
- wherein the high temperature evaporator comprises a fire tube assembly encased in a shell, wherein the fire tube assembly is connected with the shell through an upper tube sheet and a lower tube sheet, and wherein the fire tube assembly and the shell are arranged coaxially along a first axis;
- wherein the superheater, the low temperature evaporator and the economizer are arranged coaxially along a second axis perpendicular to the ground;
- and
- wherein the first axis is inclined and forms an angle of about 5-10 degrees in relation to the second axis.
Dependencies are inferred from the claim text.