Method for preparing hydrogen-rich fuel gas through high-humidity sludge gasification based on blast furnace slag waste heat recovery

Abstract

The invention provides a method for preparing hydrogen-rich fuel gas through high-humidity sludge gasification based on blast furnace slag waste heat recovery. The method comprises the steps that high-temperature gas and high-temperature slag particles which are generated in the liquid blast furnace slag air-quenching and granulating processes serve as a high-humidity sludge drying heat source and a sludge gasification heat source respectively, water in sludge is converted into vapor in the drying and gasifying stages, and the vapor serves as a sludge gasifying medium and a catalytic reforming medium for gasifying tar; meanwhile, the catalytic action of blast furnace slag is utilized for catalytically degrading the tar and converting the tar into the fuel gas. According to the method for preparing the hydrogen-rich fuel gas through high-humidity sludge gasification based on blast furnace slag waste heat recovery, blast furnace slag waste heat serves as a heating source for high-humidity sludge drying and dewatering and gasifying, and meanwhile the catalytic action of the blast furnace slag is utilized for degrading and converting the tar; the purpose of using waste for treating waste is achieved, the sludge gasification cost is reduced, and high-efficiency conversion of organic matter in the sludge to high-grade hydrogen energy is achieved.

Description

technical field [0001] The invention relates to the technical field of sludge resource utilization, in particular to a method for producing hydrogen-rich gas by gasifying high-humidity sludge based on blast furnace slag waste heat recovery. Background technique [0002] The following problems exist in the disposal and resource utilization of sludge at home and abroad: (1) There are potential safety hazards in landfills, which affect the operation of landfills; (2) There are food safety risks in sludge fertilizer making, and it is difficult to promote; (3) Sludge If the water content is too high, conventional direct combustion utilization will not be worth the energy gain. It can be seen that the current domestic and foreign biological sludge treatment equipment is mainly for the purpose of absorbing sludge, and has not produced actual economic benefits and formed valuable commodities. [0003] With the gradual depletion of fossil energy worldwide and the increasing content ...

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Problems solved by technology

[0002] The following problems exist in the disposal and resource utilization of sludge at home and abroad: (1) There are potential safety hazards in landfills, which affect the operation of landfills; (2) There are food safety risks in sludge fertilizer making, and it is difficult to promote; (3) Sludge The water content is too high, the conventional direct combustion utilization, the energy gain outweighs the loss

[0005] (1) Efficient use of water in sludge. For a long time, the biggest problem encountered in sludge resource utilization is that the water content of sludge is too high. The existing sludge mechanical dehydration and heating evaporation consume a lot of energy, and evaporation produces The high-temperature water vapor cannot be effectively utilized, resulting in low efficiency of sludge resource utilization, and it is difficult to generate economic value;

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