Two-section gasification furnace and waste boiler system with high slag capturing rate

Abstract

The invention discloses a two-section gasification furnace and waste boiler system with a high slag capturing rate. The two-section gasification furnace and waste boiler system comprises a two-section gasification furnace, a cyclone separator and a waste boiler, wherein a chilling gas nozzle, a second-section coal burner, a fly ash nozzle and a first-section coal burner are sequentially arranged on the side wall of the two-section gasification furnace from top to bottom; a synthesis gas outlet of the two-section gasification furnace communicates with an inlet of the cyclone separator; a top outlet of the cyclone separator communicates with an inlet of the waste boiler; and a bottom outlet of the cyclone separator communicates with the fly ash nozzle through a fly ash return feeder. According to the invention, the heat exchange face of the waste boiler in the system is not prone to being blocked, and abrasion of fly ash to the waste boiler is avoided; and in addition, the slag capturing rate of the two-section gasification furnace is greatly increased.

Description

technical field [0001] The invention relates to a gasification furnace system, in particular to a two-stage gasification furnace and a waste boiler system with high slag collection rate. Background technique [0002] Coal gasification is an important technology in the field of IGCC power generation and coal chemical industry. In the waste boiler process of IGCC coal gasification, the two-stage gasifier and the waste boiler are usually integrated, and the slag collection rate is about 60%. The ash-containing synthesis gas produced by the gasifier directly enters the waste boiler through the duct section, but the synthesis gas produced by the two-stage gasifier carries fly ash with a coal ash content of about 40% into the waste boiler, which is easy to cause The heat exchange area in the waste boiler is clogged with dust, and long-term use will seriously affect the heat exchange effect of the heat exchange surface. Therefore, the design margin of the heat exchange area of ​​th...

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Problems solved by technology

The ash-containing synthesis gas produced by the gasifier directly enters the waste boiler through the duct section, but the synthesis gas produced by the two-stage gasifier carries fly ash with a coal ash content of about 40% into the waste boiler, which is easy to cause The heat exchange area in the waste boiler is clogged with dust, and long-term use will seriously affect the heat exchange effect of the heat exchange surface. Therefore, the design margin of the heat exchange area of ​​the boiler is relatively large, resulting in increased cost and equipment volume, which seriously affects the gas promotion and application of

In addition, when the fly ash particles in the syngas flow through the waste boiler at high speed, they will cause erosion and wear to the heat exchange surface. Long-term operation will lead to the thickness of the wall surface being thinned, losing its original design performance, and even the possibility of tube explosion. poses a potential threat to the normal safe operation of the device

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