A side-zone cooling system for a gasifier

Abstract

This invention provides a side-zone cooling system for a gasifier. The system includes an upper side-zone cooler, a feed pipe, a coolant feed device, and a protective gas feed device. The upper side-zone cooler is located in the shoulder area of ​​the waste boiler inner cylinder of the gasifier, outside the flow path of the crude syngas. The atomizing nozzles of the upper side-zone cooler spray coolant into the crude syngas in the upper side zone of the waste boiler. The coolant delays vaporization as it descends through the crude syngas, lowering its temperature and solidifying the liquid slag carried by the crude syngas, while wetting the fine ash, preventing them from adhering to the waste boiler wall. The side-zone cooling system controls the temperature of the high-temperature crude syngas descending through the gasifier, rapidly cooling it by approximately 100–400°C. This transforms the molten ash in the crude syngas into a solid state, reducing its viscosity and wetting the fly ash entrained in the crude syngas, thus capturing the ash and preventing liquid slag and fly ash from adhering to the waste boiler wall. This effectively reduces steam production attenuation, achieves long-term stable operation, and reduces operational difficulty and maintenance costs.

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