gas generator-Wuxi Machinery Manufacturing Co., Ltd.

Working principle of gas generator:

Producer gas is generated by mixing water vapor and air to form a gasification agent and then flowing through a hot fixed combustion bed. The oxygen and water vapor contained in the air react with the carbon in the fuel to generate producer gas containing CO, CO2, H2, CH4, N2 and other components. Vapor mixed with air increases thermal efficiency and reduces combustion bed temperature, thereby controlling frit formation. The reaction between steam and carbon is an endothermic reaction: C+H2O=CO+H2-Q (Q is heat, the same below) When oxygen and carbon react, heat is released: 2C+O2=2CO+Q. The temperature of the combustion bed depends on the saturation temperature of the gasification agent, the particle size and type of the fuel and the furnace type of the generator. The temperature of the combustion bed is important because for a given fuel and furnace type, it determines the composition of the furnace gas: at high temperatures, a large amount of combustible gas can be produced. Therefore, it is important to keep the combustion bed high without forming clinkers. The temperature at which the frit is formed depends on the slag melting characteristics of the fuel. When there is sufficient oxygen, two reactions will occur: 2CO+O2=2CO2+QC+O2=CO2+Q. Therefore, the production of CO does not necessarily mean that any carbon combustion can reduce the calorific value of gas. In addition, some water vapor also reacts with CO, because when each volume of CO is converted into CO2, the same volume of H2 is also generated: CO+H2O=CO2+H2. Therefore, there is no heat loss. In the reduction layer, when its temperature is lower than 1200°C, the following rapid reaction will occur: CO2+C=2COH2O+C=CO+H2. When the coal gas passes through the reduction zone, the combustible gas content rises rapidly, while the CO2 and water vapor content decreases. After passing through the reduction zone, some gas is extracted and flows through the bottom cyclone dust collector and forced air cooler. This gas is called“bottom gas”, its temperature is about 400℃. In the retort layer, the fuel fed to the generator is dried, preheated and carbonized in sequence. The generated steam, tar mist and gas leave the generator together from the top. This part of the gas is called“top gas”, its temperature remains around 120°C.

Gas generator technical parameters:

name	unit	Producer specifications	-	-	-	-	-	-	-
Furnace diameter	mm	1600	1800	2000	2400	2600	3000	3200	3400
Furnace cross-sectional area	m2	2	2.54	3.14	4.52	5.31	7.07	8.04	9.08
fuel layer height	mm	1000	1000	1000	1000	1000	1000	1000	1000
Fire level height	mm	100～300	-	-	-	-	-	-	-
Gray layer height	mm	100～300	-	-	-	-	-	-	-
Applicable fuel	Non-caking bituminous coal, anthracite, coke	-	-	-	-	-	-	-	-
fuel particle size	mm	13～25 25～50	-	-	-	-	-	-	--
fuel consumption	Kg/h	350～460	500～600	500～720	700～1040	850～1200	1700～2000	1800～2200	2500~2800
gasification agent	air, water vapor	-	-	-	-	-	-	-	-
Gas production	Nm3/h	1200～1600	1500～2100	1750～2500	2500～3600	3000～4300	6000～7000	6500～7500	7000-9000
Ash disk speed	r/h	3.5	3.5	2.23	2	1.7	1.7	1.7	1.5
Gas calorific value	KJ/Nm3	5020～5670	-	-	-	-	-	-	-
Gas outlet temperature	℃	400～550	-	-	-	-	-	-	-
gas outlet pressure	Pa	980～1470	1470-1960	-	-	-	-	-	-
blast pressure	Pa	<4000	<6000	-	-	-	-	-	-
saturated air temperature	℃	50-65	-	-	-	-	-	-	-
Water jacket working pressure	Pa	<100Kpa	<294Kpa	-	-	-	-	-	-
Fire hole pressure	Pa	<100Kpa	<294Kpa	-	-	-	-	-	-
grate drive Motor power	KW	4	5.5	-	-	-	-	-	-
Coal bucket lifting Motor power	KW	1.5	3	-	-	-	-	-	-
Total equipment weight	T	12	15	19	24	28	42	45	55