Ash fusion gas generation

Technical principle: The raw material coal powder is fluidized in the gasification furnace by a stream of gasifying agents (oxygen and water vapor) that enter at high speed from the bottom of the furnace, causing the coal particles and ash particles in the bed to boil. At a high temperature of around 1100°C, the coal particles come into full contact with the gasifying agents, resulting in reactions such as combustion, dry distillation, pyrolysis, decomposition of water vapor, and redox reactions of carbon, ultimately leading to the complete gasification of the coal. 　　The difference between a selective ash discharge fluidized bed and a conventional fluidized bed lies mainly in the presence of a selective ash separation device at the bottom of the fluidized bed. This device creates a region of high temperature within the furnace bed, where the ash particles stick together and form balls. The difference in weight then enables the separation of these ash balls from the coal particles, thereby reducing the carbon content in the ash and improving the efficiency of carbon utilization. Simplified process flow diagram; Technical features: 1) Low cost for processing coal before it enters the furnace, allowing for full utilization of inexpensive pulverized coal resources ； 　　2) Wide adaptability to different types of coal (lignite, bituminous coal, subbituminous coal, anthracite, coke dust, etc.) ； 　　3) Good composition of active gases: CO+H2≥72~78% ； 　　4) The gas is free of tar and heavy hydrocarbons; it has a low phenol content and generates little wastewater ； 　　5) High single-furnace production capacity and operational flexibility ； 　　6) The vaporization furnace has a simple structure, with no rotating components inside, resulting in low maintenance costs ； 　　7) Easy to start and stop, with good safety features ； 　　8) High heat recovery efficiency, with sufficient steam self-sufficiency ； 　　9) Low residual carbon in the slag, high carbon utilization rate ； 　　10) A certain amount of CO2 can be added as a gasifying agent to adjust the gas composition and reduce consumption ； 　　11) The equipment is entirely manufactured domestically, resulting in lower investment costs. Technical Application Scope ★ Local transformation of raw coal for small and medium-sized fertilizer plants ； 　　★ Production of raw gas for coal-based ammonia (alcohol) production ； 　　★ Production of industrial and domestic gas ； 　　★ Carbon supplementation for the production of methanol and dimethyl ether from natural gas and coke oven gas ； 　　★ Support for IGCC. Coal type suitability ★ Coal types range from bituminous coal to anthracite, with ash content ranging from 10% to 40%, and cinder characteristics ranging from 1 to 6. 　　★ Requirements for the particle size of the raw coal: The particle size range is 0–6 mm (with <1% of particles being larger than 6 mm and <20% being smaller than 1 mm). 　　★ External moisture ≤5%. Emissions Status ★ Exhaust gases: The device operates continuously with no exhaust gas emissions. 　　★ Waste residue: residual carbon in the slag