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Gasifying method and device for treating low thermal value fuel

A gasification device and low calorific value technology, which is applied in waste treatment, solid waste removal, etc., can solve the problems of gasification efficiency, low calorific value of gas, small range of fuel utilization, low economic benefits, etc., and achieve environmental purification , Inhibit the formation of NOX and dioxin, and reduce the effect of air coefficient

Inactive Publication Date: 2004-06-09
CENT SOUTH UNIV
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Problems solved by technology

Air gasification at room temperature, difficult to handle ash, easy to form tar, phenol and other compounds, low gasification efficiency and gas calorific value, small range of fuel utilization, complicated pretreatment; oxygen-enriched or pure oxygen gasification can improve gasification efficiency and gas calorific value, but air separation device is required, power consumption is large, the system is complicated, and the economic benefit is not high

Method used

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  • Gasifying method and device for treating low thermal value fuel
  • Gasifying method and device for treating low thermal value fuel
  • Gasifying method and device for treating low thermal value fuel

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Embodiment Construction

[0022] attached figure 1 It also shows the gasification working process of the present invention for processing low calorific value fuels.

[0023] The air preheater 1 is provided with two cavities on the left and right, which are respectively used as the mixed gasification agent flow channel and the combustion zone; the flue gas waste heat limit recovery devices 6 are arranged in pairs, and the passage of compressed air and low-temperature flue gas is controlled by a switching valve 9 to carry out Periodic switching, alternately passing through the flue gas waste heat limit recovery device 6; the flue gas waste heat limit recovery device 6 can preheat the normal temperature air to a level close to the airflow temperature of the combustion zone (only 100-200 °C difference); a waste heat recovery device 6 discharges When it is hot, the normal temperature air rises from room temperature to a temperature above 800°C; most of the preheated air enters the gasifier 2 from the middle...

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Abstract

The present invention can be used for in-place treatment of low heating value coal, biofuel and domestic refuse, and it is characterized by that its air preheater is one-by-one communicated with gasifying device, gas-dregs separator, steam generator, gas purifying device and change-over valve by means of pipeline, and its change-over valve is communicated with heat recovering device placed in lower end of the air preheater, so that it is a closed circulating gasification system. In the course of gasification process for treating low heating valuve fuel, according to different material athe correspondent temperature can be controlled.

Description

Technical field: [0001] The invention is applied to the in-situ gasification treatment of low calorific value coal, biomass fuel and domestic garbage. technical background: [0002] Low-calorific-value fuels, mainly including low-calorific-value coal, biomass fuel, and domestic waste, are not only inefficient, but also difficult to meet increasingly stringent environmental protection requirements. Gasification of low calorific value fuels not only facilitates storage and long-distance transportation, reduces transportation costs, but also expands the use of fuels, improves energy utilization efficiency, and reduces pollution. At present, the gasification of low calorific value fuels is mainly fixed-bed gasification and fluidized-bed gasification, and both are based on normal temperature gasification. Air gasification at room temperature, difficult to handle ash, easy to form tar, phenol and other compounds, low gasification efficiency and gas calorific value, small range of...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCY02W30/20
Inventor 蒋绍坚艾元方彭好义邓胜祥汪洋洋程树棋吴创之
Owner CENT SOUTH UNIV
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