ANAEROBIC CATALYTIC THERMAL CRACKING METHOD FOR SOLID WASTE

摘要

An anaerobic catalytic thermal cracking method for solid waste, the steps thereof comprising: waste pre-treatment: putting transported waste into a garbage pool and removing waste water, then implementing in turn coarse breaking, dehydration, and crushing into waste pellets of less than 3 cm; heating the waste pellets using surplus heat and renewable combustible gas and/or external heating; and drying to reduce the water content of the waste particles to 10-30% to obtain dry waste particles. Waste cracking and decomposition: placing the dry waste pellets into a fluidised cracking furnace, and in anaerobic conditions, heating the fluidised cracking furnace using surplus heat and renewable combustible gas and/or external heating, such that the cracking temperature and heating rate meet requirements, and adding a catalyst, such that the organic matter in the dry waste pellets is decomposed into inorganic matter, combustible gas, biochar, and liquid compounds. Post-cracking and post-decomposition product processing: separation, purification, synthesis, and processing of the inorganic matter, combustible gas, biochar, and liquid compounds into buildings materials, fuel gas, finished fertiliser, and fuel oil. The present method can process complex mixed waste and continuously feed in material in mid and low temperature, catalytic, and entirely anaerobic conditions, in order to implement highly efficient thermal cracking to produce fuel gas and carbon, and additionally implementing secondary cracking and decomposition of the produced tar to eliminate pipeline blockages and improve the calorific value of the fuel gas.