二 production methods and main equipments ofcoalgasificationCoal gasification processes differ widely.According to the different mode of operation,coalgasification proceeds by batch and continuousgasification processes.According to different reactor technologies, coalgasification proceeds by the fixed-bed (moving-bed)the fluidized-bed, and the entrained-flow gasifier,respectively
二、production methods and main equipments of coal gasification Coal gasification processes differ widely. According to the different mode of operation, coal gasification proceeds by batch and continuous gasification processes. According to different reactor technologies, coal gasification proceeds by the fixed-bed (moving-bed), the fluidized-bed, and the entrained-flow gasifier, respectively
fixed-bed (moving-bed)Three gasifiers and temperature distributing煤（6-~50mm）Coal(6-50mm)煤上煤气煤气水蒸汽氧造Steam20060010001800140002造温度.℃Coal(0.2-5mm)煤气甘in the bed媒灰水蒸汽氨资Steam600fluidized-beapo100014001800清02密度,℃煤气煤气东Steam媒02流水蒸汽氨体200600100014001800entrained-bedCoal(<0.1mm)湿度.℃
Three gasifiers and temperature distributing in the bed fixed-bed (moving-bed) fluidized-bed entrained-bed Coal (6-50mm) Coal (0.2-5mm) Coal (＜0.1mm) Steam O2 Steam O2 Steam O2
Coal gasification characteristics:Hightemperature reactions 1100~1200℃Largeamount of heatabsorptionNeed to supply large amount of heatThermal eguilibrium of entire system is kept by thereaction heat burning partial carbon
High temperature reactions 1100～ 1200℃ Large amount of heat absorption Need to supply large amount of heat Thermal equilibrium of entire system is kept by the reaction heat burning partial carbon. Coal gasification characteristics:
1.Water gas is prepared by fixed-bed batch gasificationWorking cycle is compose of six steps二次上吹制气→空气吹净下吹制气一次上吹制气吹风蒸汽吹净-（蒸汽自下而上）（自下而上（蒸汽自上而下）空气自下而上）（蒸汽自下而上）Blowing stage:The temperature of coal layer is increased by burning fullycoalin blowing air to form CO2 and release large amount of heat.Thefluegasproduced byburning coalis emptied.When coal layer temperature reaches about 120o C, blowingis stopped
1. Water gas is prepared by fixed-bed batch gasification Working cycle is compose of six steps Blowing stage: The temperature of coal layer is increased by burning fully coal in blowing air to form CO2 and release large amount of heat. The flue gas produced by burning coal is emptied. When coal layer temperature reaches about 1200 ℃, blowing is stopped
Steam blowing:Blowing gas in the stove and outlet tube isreplaced byblowing the steam so asto ensurethe water gas quality.First blowing up : Temperature of fuellayer bottom decreasing,temperatureoftopincreasingBlowing down : To balance the temperature of fuellayerSecondary blowing up : Purging the blowing down gas in thestovebottom,and preparingforairinhaledAir blowing:The blowing gas can be recovered.空气吹净下吹制气二次上吹制气+次上吹制气蒸汽吹净吹风-→（蒸汽自下面上）（自下而上（蒸汽自上而下）（空气自下而上）（蒸汽自下而上）
Steam blowing：Blowing gas in the stove and outlet tube is replaced by blowing the steam so as to ensure the water gas quality. First blowing up ：Temperature of fuel layer bottom decreasing, temperature of top increasing. Blowing down ：To balance the temperature of fuel layer Secondary blowing up : Purging the blowing down gas in the stove bottom, and preparing for air inhaled. Air blowing：The blowing gas can be recovered