低压干粉煤气化工艺

Low-pressure dry powder coal gasification technology

Abstract

本发明公开了一种低压干粉煤气化工艺,包括将粉煤送入气化炉气化得到合成气,所述合成气经气化炉下段水激冷后送入洗涤塔中进行洗涤后合成气由洗涤塔顶部排出送入后续工序,所述粉煤和氧气的混合物分别经气化炉顶部的垂直喷嘴和上段侧壁的多个侧向喷嘴喷入气化炉内并瞬间被点燃,形成的火焰呈交汇状态,粉煤在高温下气化生成合成气;所述合成气经进气口进入洗涤塔内的直角弯管中,在直角弯管出口处与阻塞喷头喷出的水雾充分混合并降温,未雾化的水则沿直角弯管底部的排水管流入洗涤塔下段,洗涤后的合成气由洗涤塔顶部排出。本发明工艺简单、气化效率高、设备投资和运行成本低、安全可靠性好、节能降耗、特别适用于低压气流术干煤粉气化技术。
The invention discloses a low-pressure dry powder coal gasification technology which comprises the following steps: powder coal is fed into a gasifier and is gasified to obtain synthesis gas, the synthesis gas is fed into a washing tower to be washed after being chilled by water at the lower section of the gasifier and is exhausted from the top of the washing tower to be fed into a subsequent procedure, a mixture of the powder coal and oxygen is injected into the gasifier through a vertical nozzle formed in the top of the gasifier and a plurality of lateral nozzles formed in the upper section side wall of the gasifier separately and is instantly ignited, formed flame is in an intersection state, and the powder coal is gasified at high temperature to produce the synthesis gas; and the synthesis gas enters a right-angle bend in the washing tower through a gas inlet, is fully mixed with water mist ejected from a blocking nozzle at the outlet of the right-angle bend and is cooled, water without being atomized flows into the lower section of the washing tower along a drainage pipe at the bottom of the right-angle bend , and the synthesis gas subjected to washing is exhausted from the top of the washing tower. The low-pressure dry powder coal gasification technology is simple, is high in gasification efficiency, low in equipment investment and running cost and good in safety and reliability, saves energy, lowers consumption and is particularly suitable for a low-pressure air flow method dry powder coal gasification technology.

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