Gasification entrained-flow bed coal powder gasification furnace and gasification method of micro-positive pressure air

Abstract

The invention discloses a gasification entrained-flow bed coal powder gasification furnace and a gasification method of micro-positive pressure air. At present, a normal-pressure fixed bed gasification furnace is commonly applied in an industrial fuel gas preparation industry and an efficient powdered coal entrained-flow bed gasification technology has some difficulties on preparing industrial fuel gas under the condition that the micro-positive pressure air is used as a gasifying agent. The gasification entrained-flow bed coal powder gasification furnace is characterized in that a gasification furnace body is provided with at least one row of wall surface burners; each row of the wall surface burners comprise a plurality of wall surface burners which are arranged along the peripheral direction of the gasification furnace body at intervals; the gasification agent which is sprayed into the gasification furnace by all the wall surface burners accounts for 80%-97% of the use amount of all the gasification agent; a furnace bottom nozzle is arranged below the bottom face of a gasification furnace slag opening; the gasification agent which is sprayed into the gasification furnace by the furnace bottom nozzle accounts for 3%-20% of the use amount of all the gasification agent. According to the gasification furnace, the gasification intensity of a unit volume is high; the quantity of in-furnace coal powder falling into a dreg tank is effectively reduced; the gasification entrained-flow bed coal powder gasification furnace is very suitable for producing the industrial fuel gas by taking the micro-positive pressure air as the gasification agent.

Description

Technical field [0001] The invention relates to the field of entrained bed gasification reactors for solid carbon-containing fuels such as coal, biomass, petroleum coke and gasification agent to react at high temperature to generate CO and H2, in particular to a kind of entrained bed powder for micro-positive pressure air gasification Coal gasifier and its gasification method. Background technique [0002] Coal-made low-calorific value artificial gas has a wide range of uses in machinery, metallurgy, building materials and other industries. Currently, fixed-bed gasifiers are commonly used to produce artificial gas, with a heating value of up to 1200kcal / M3. Fixed-bed gasifiers require a block With coal as a raw material, low carbon conversion rate, low output per furnace, low automation of control, and tar in coal gas, people hope to replace traditional fixed-bed gasification technology with better gasification technology. [0003] Entrained-flow pulverized coal gasification techn...

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Problems solved by technology

[0005] The gasifier body is too large, which directly leads to a substantial increase in equipment cost, inconvenient installation and transportation, too much heat dissipation from the furnace body, and the waste heat cannot be effectively utilized, thus restricting the use of entrained bed gasifiers in the industrial gas industry. application

[0006] In addition, there are two common problems in the entrained-bed gasifier currently in operation. The first is that the liquid slag at the slag outlet is not discharged smoothly, and there is often a blockage phenomenon, which requires frequent inspection and cleaning, which affects the continuous and normal operation of the gasifier system; Second, more pulverized coal particles will fall into the slag pool from the slag outlet, which affects the utilization rate of fuel and causes a certain degree of waste

If air is used as the gasification agent, the temperature in the furnace will be lower, and the slag discharge port cannot guarantee smooth slag discharge for a long time, thus affecting normal work

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