The gas generated by the double-stage gas generator is divided into upper section gas and lower section gas. The gas in the upper section is equipped with an advanced I-level electric tar collector to remove heavy tar and dust. Its working temperature is between 90-150 degrees Celsius. After entering the indirect cooler, the gas is cooled to about 35-45 degrees Celsius in the indirect cooler. The lower section gas is dusted by the cyclone dust collector, and the temperature after dust removal is about 450-550 degrees Celsius. Then it enters the waste heat heat exchanger, which cools the gas while recovering the sensible heat of the gas. The gas temperature drops to about 200-230 degrees Celsius; then it enters the air cooler for cooling, and the temperature drops to 35-45 degrees Celsius. After being indirectly cooled, the upper gas and lower gas enter the secondary electric light oil collector to be deoiled and dusted again. The cooled and purified gas is pressurized and pressurized, and then transported through gas pipelines for use.
The retorting gasifier is a furnace type developed on the basis of a two-stage furnace. The gas in the lower section of the two-stage furnace is eliminated and all the gas is fully retorted in the retorting section and discharged from the top of the gas furnace. The retort furnace not only retains the simple advantage of the two-stage furnace in terms of material layer control, but at the same time, because all the gas produced in the gasification section flows upward due to the retort coal, there is no need to adjust the flow rate of the gas, which greatly reduces the complexity of the operation and maintenance of the gas furnace.
Retorting furnaces are better than one-stage furnaces and two-stage furnaces in reducing ash carried by gas.
