Oxygen-increasing intermittent gasification method and technique for fixed bed coal gas producer

Abstract

The invention discloses a fixed bed coal-gas producer aerobic intermittent gasification method and the technology. The method comprises intermittently inputting gas to a coal-gas producer, wherein the gas is aerobic air which is mixed by air and oxygen and the oxygen-containing concentration of the aerobic air is 22-53%. The technology comprises firstly, inputting the aerobic air into a furnace, then, using steam to blow to the furnace inside in the order of blowing upwards, blowing downwards and secondly blowing upwards, and generating coal-gas. The invention can increase the air blowing efficiency, reduce discharging volume of waste gas, and saves energy sources effectively, when the oxygen-containing concentration of the aerobic air reaches to about 50%, furnace inside temperature reaches best reaction temperature due to the increase of the air blowing efficiency under the condition that the nitrogen volume reaches demands in a system, thereby the gas quality reaches balance, zero emission can be realized, thereby the invention can utilize the energy sources to the maximum, and the produced coal-gas has good gas quality.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to a fixed-bed coal gasifier intermittent gasification method and a process thereof. Background technique [0002] The traditional fixed-bed gasifier intermittent gasification method is to use the oxygen in the air to react with carbon to increase the temperature in the furnace, so that the incoming steam reacts with carbon at high temperature to produce gas. The process steps are: a. Blowing (blowing air into the furnace with a blower), recovering the residual gas in the upper gas pipe of the furnace and equipment; b. Blowing (continuing to blow air into the furnace) to increase the temperature in the furnace; c. Recycle nitrogen to industrial gas cabinets to meet the ammonia synthesis process H 2 / N 2 d. Blow steam upward into the furnace to generate water gas; e. Blow steam downward into the furnace to stabilize the position of the gasification layer while generating water gas;...

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Problems solved by technology

Due to the low oxygen content and high nitrogen content in the air, traditional gasification methods and processes use air as the gasification agent. On the one hand, the blowing efficiency is low, the heat loss is large, and the energy consumption is high. On the other hand, when the nitrogen content in the system has reached When the index (required nitrogen content of synthetic ammonia) is reached, the temperature in the furnace is far from the optimum reaction temperature required for gasification, so only a long blowing and venting time can be used to meet the temperature raising and heat storage requirements, resulting in a large amount of waste gas ( carbon dioxide, sulfur dioxide, carbon monoxide, methane, etc.)

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