气化渣高温预热脱碳工艺及其固相产物水泥特性试验

Gasification slag is the solid waste produced in the process of coal gasification. At present, it is mainly treated by landfill. It not only occupies a large amount of land, pollutes soil and water, but also causes energy waste. The gasification slag has a certain carbon content, but the volatile content is very low and the water content of the receiving base is very high, which leads to the difficulty of energy utilization of the gasification slag. High temperature preheating decarbonization process is one of the effective technical approaches to realize the resource disposal of ultra-low grade coal-based solid waste developed in recent years. This process can realize the self-stable combustion and burnout process of solid waste with near zero volatile matter and ultra-low calorific value, such as gasification slag and ash sludge mixture. After the gasification slag with the proportion of dry base fixed carbon of 13.1%-16.2% is treated by the integrated equipment of 100 000 tons/ year high temperature preheating and decarbonization in the single line of Xinjiang Ganquanpu Industrial Park, the volatilization is basically removed, and the carbon content of exported ash residue is lower than 3%. The stable ignition and efficient burning of input materials can be achieved without adding auxiliary fuel. The flue gas at the outlet of stable operation is converted to 9% O₂ concentration, and the NO_x emission is in the range of 64.5-66.9 mg/ m³. The gasification slag and gasification slag sludge mixture after decarburization of the industrial demonstration production line are ground to replace 30% cement for mortar preparation, and the strength activity index reaches 80% and 91% respectively, meeting the requirements of the strength activity index of fly ash for mortar and concrete mixing and fly ash for cement active mixing materials.