J-shaped entrained-flow gasifier

Abstract

The invention discloses a J-shaped entrained-flow gasifier. The J-shaped entrained-flow gasifier is characterized in that the gasifier has a J-shaped design, a slag-drip opening is formed in the lowest point at the bent position of the J-shaped gasifier, and a slag collection chamber is formed in the lower part of the slag-drip opening; a gasifying raw material inlet is formed in the higher side of the J-shaped gasifier, and a synthesized gas outlet is formed in the lower side of the J-shaped gasifier. According to the entrained-flow gasifier, the gasifier is designed into J shape, flying gas carried in synthesized gas is collected by the wall surface of the bent position, so that the carbon conversion rate can be effectively improved, and the ash carrying capacity at the synthesized gas outlet can be reduced; and slag bonding and ash accumulation can be prevented when heat of a synthesized gas is reclaimed by a radiant syngas cooler and a convective syngas cooler. The slag-drip opening is close to the high-temperature region of the gasifier, so that the temperature of the slag-drip opening is higher, and smooth slag drip can be ensured.

Description

technical field [0001] The invention relates to a J-type entrained-bed gasification furnace, which belongs to the field of energy clean utilization. Background technique [0002] Coal gasification technology is the basis for the development of process industries such as coal-based chemicals, coal-based liquid fuels, combined cycle power generation, and hydrogen production, and is the key technology and leading technology in these industries. [0003] The existing carbon-containing fuels such as coal and coke can be gasified. Among the gasification technologies using entrained bed, the representative dry coal powder gasification technologies mainly include: Shell gasifier, GSP gasifier, aerospace Furnace, Dongfang furnace and two-stage dry coal pulverized gasifier; coal-water slurry gasifier includes: multi-nozzle gasifier, GE gasifier, E-Gas gasifier, Tsinghua furnace, etc. [0004] Judging from the gasification furnaces that have been industrialized at present, the gasific...

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Problems solved by technology

[0004] Judging from the gasification furnaces that have been industrialized at present, the gasification furnace with multiple nozzles is easy to be enlarged, but the feeding pipeline is complicated and the investment is high

Single-burner entrained-bed gasifiers all adopt the top-injection method. Since the outlet of the syngas is set directly below the nozzle, there is a short-circuit of some materials. Actual carbon conversion is lower

In addition, the use of water to quench the syngas leads to a serious waste of high-level thermal energy of the syngas, which reduces the efficiency of energy utilization

The use of waste heat boilers to recover the high-level heat energy of high-temperature syngas is conducive to improving energy utilization efficiency, but for gasifiers with downward syngas, both slag and high-temperature syngas enter the waste heat boilers, resulting in serious slagging of waste boilers

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