BGL gasifier cold standby start-up process

Abstract

The invention discloses a cold-standby startup process method for a BGL gasification furnace. The method comprises the steps of confirming conditions before reducing load and performing shutting down,reducing the load and performing shutting down, discharging slag, cooling the furnace and performing startup; in the step of confirming the conditions before reducing the load and performing shuttingdown, conditions include a good reaction and no deviant combustion or voids in the furnace; in the step of reducing the load and performing shutting down, a steam-oxygen ratio is kept unchanged, andafter oxygen load is reduced to a negative threshold, the system enters a hot standby state; and the gasification furnace is depressurized to a slag discharge threshold, and pressure is kept stable; and in the step of discharging the slag, the pressure of the gasification furnace is kept at the slag discharge threshold, and air purge is performed at a blower nozzle; and after the slag in a slag pool is completely discharged under standard flame, a burner is stopped, the blower nozzle is switched to nitrogen purge, and nitrogen purge is performed at a slag tap. For the BGL gasification furnace,the method disclosed by the invention can perform reheating startup through process optimization without digging the furnace, and greatly save running costs of re-startup.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a cold standby start-up process method of a BGL gasifier. Background technique [0002] As we all know, the crushed coal pressurized slag gasifier (BGL) has been widely used in the industry due to its low oxygen consumption, low heat recovery cost, and high process efficiency. During the operation of BGL, the raw coal and flux with particle size of 6-50mm enter the pressurized gasifier through the top coal lock, and when the coal moves from top to bottom against the upward airflow in the gasifier, it is dried and degassed. In addition to volatile matter, gasification, and final combustion. At the bottom of the gasifier, tuyeres inject a mixture of steam and oxygen into the combustion zone, where the oxygen reacts with the remaining coke to release high heat with a temperature above 2000°C. Such high temperatures are sufficient to melt the ash and provide heat to suppo...

AI Technical Summary

Problems solved by technology

[0003] In the existing BGL gasifier design, after the shutdown, it is necessary to dig out the unreacted coal in the furnace and refill the raw coal before starting up. This method is time-consuming and labor-intensive, and seriously affects the safety and stability of the gasification device. run

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