Blast furnace hot blast stove coal gas system high-efficiency coal gas dispelling method

Abstract

The invention relates to a blast furnace hot blast stove coal gas system high-efficiency coal gas dispelling method. The blast furnace hot blast stove coal gas system high-efficiency coal gas dispelling method comprises the steps of connecting a three-way pipe to an outlet valve of a coal gas preheater before damping down of a blast furnace, connecting one end of the three-way pipe with an original coal gas drainer, connecting one end of the three-way pipe with a nitrogen hose, and communicating a port of the nitrogen hose with a nitrogen pipeline at a coke oven gas blending combustion valve;fully turning on a nitrogen purging valve to conduct purging on a coal gas pipeline after damping down of the blast furnace and burnout of a hot blast stove; turning off a front ball valve of a crudegas preheater drainer and turning on a nitrogen valve after no accumulated water continuously flows out from the coal gas preheater drainer, and introducing nitrogen into the colas gas preheater; andturning on the nitrogen valve in the position again after closing a lower blind plate of the coke oven gas blending combustion valve and introducing nitrogen into a coke oven gas blending combustion pipeline and a mixed coal gas main. Through the blast furnace hot blast stove coal gas system high-efficiency coal gas dispelling method, the total volume of nitrogen introduced into a coal gas systemis increased, effective replacement of nitrogen and coal gas in the pipelines is accelerated, and the purging time is substantially shortened.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hot blast stove technology, and relates to a method for efficiently driving gas from a blast furnace hot blast stove gas system. Background technique [0002] When dealing with blast furnace hot blast stove gas system equipment, the gas pipeline must be purged with nitrogen according to safety regulations, and the construction can only be carried out after passing the test. Existing blast furnace hot blast stoves drive gas operations usually only when the gas pipe network enters the gas blind valve (glasses valve) of the gas main pipe for hot blast furnaces or after the gas water seal, nitrogen is introduced into the gas system, including the gas preheater, gas Main pipes, gas branch pipes and other piping systems and equipment shall be purged. Due to the long gas system pipeline, large internal volume, and the blind valve (glasses valve) or the nitrogen purge pipe connected after the gas w...

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Problems solved by technology

Due to the long gas system pipeline, large internal volume, and the blind valve (glasses valve) or the nitrogen purge pipe connected after the gas water seal is small, it needs to be purged for more than 5 to 7 hours to pass the test, which seriously affects The progress of the maintenance work, or even the delay of the maintenance period, directly prolongs the blast furnace shutdown time, affects the iron production of the blast furnace, and increases the difficulty of the blast furnace returning to normal production

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