Method for implementing mutual pressurization/depressurization among pressurized gasification furnace coal locks

Abstract

The invention discloses a method for implementing mutual pressurization / depressurization among pressurized gasification furnace coal locks. The coal lock is provided with a pressurization / depressurization pipeline, a final pressurization pipeline, a gas seal pipeline and an evacuation pipeline; and each pipeline is correspondingly provided with a pressurization / depressurization control valve, a final pressurization control valve, a gas seal control valve and an evacuation control valve. The control valves on the pipelines are opened and closed to implement mutual pressurization / depressurization among the coal locks; and the insufficient pressure after mutual pressurization of the coal locks is implemented by supplementing inert gas for pressurization. No coal lock gas compressor is arranged, and the evacuated gas is inert gas. The method disclosed by the invention can avoid the adverse effect on the whole coal gasification production system and the environmental pollution when crude gas is used as the coal lock pressurization gas; and the method can effectively save the energy, and lower the equipment investment and the maintenance and operating cost.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a method for filling and releasing pressure between coal locks of a pressurized gasifier. Background technique [0002] The pulverized coal fluidized bed pressurized gasification and the pulverized coal or briquette moving bed / fixed bed pressurized gasification are all realized through coal locks. The coal lock is located on the upper part of the gasifier body, and the top and bottom of the coal lock are equipped with valves, which are usually called coal lock upper valves and lower valves. The raw coal for gasification is fed into the gasifier through the coal lock. During the process of adding coal, the coal lock has to undergo two alternating processes of pressure relief and pressure charging: when the coal in the coal lock is used up, the coal lock lower valve is closed, and the coal lock pressure relief valve is opened to reduce the pressure in the coal lock to A...

AI Technical Summary

Problems solved by technology

At present, most enterprises pressurize the coal-locked gas through the compressor, and then send it to the crude gas system to recover the coal-locked gas, but it consumes a lot of compression work, and because the coal-locked gas volume fluctuates greatly, the washing is not clean , the dust in the coal lock gas often causes damage to compressor valves, piston rings and other components

Patent CN101781580A discloses a method for charging and releasing pressure in pressurized gasifier coal lock staged. The method is equipped with multi-stage washing and separating buffers and corresponding multiple compressors. The gas main pipe inevitably consumes compression work, and increases equipment investment and maintenance and operation costs

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