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Coal gasifier feature, 1.High efficiency, 2.High gasification efficiency, 3.High heating value, 4.Higher autoimmunization - details see: https://www.machineto.com/yisheng-3-2m-two-stage-cold-gas-coal-gasifier-10221203

Yisheng 3.2M Two Stage Cold Gas Coal Gasifier

1.What is the coal gasification

Coal gasification is the foundation of gasifying agent and the carbon. The gasifying agent(water vapor and air mixture) flowing through the hot fixed-bed of combustion coal, there are series chemical reaction process. Gasifying agent contained oxygen and steam reaction with the carbon to produce O₂, H_2,CH₄, C₂H₄, N₂among them , the CO H₂CH_4,C_mH_nare combustible gases. The main chemical reaction is showing as in the above drawing.

2.Coal gasification theory

Basic chemical reaction Producer gas is made by the gasification agent, which is mixture of steam and air, goes through red-hot fixed burning bed. The oxygen and steam content in the air react with the carbon in the fuel, generate the producer gas with ingredients like CO, CO₂, H₂, CH₄, C₂H₄, N₂etc.

Reaction of steam and carbon is endothermic reaction:C + H₂O= CO + H₂

When oxygen and carbon react, then heat output:2C + O₂=2CO

Reaction of carbon monoxide and steam:CO + H₂O = CO₂+ H₂

Some steam here reacts with carbon monoxide. When every volume of carbon monoxide translates into carbon dioxide, generates the same volume of hydrogen at the same time. In the reducing zone, quick reaction is occurred when the temperature is below 1200 Celsius degree .

CO₂+ C = 2CO and H₂O + C=H₂+ CO

When the coal gas goes through the reducing zone, flammable gas content rises rapidly, carbon dioxide and steam content decrease. Across the reducing zone, a part of coal gas is exported, flows through bottom cyclone and wind cooler, this part of gas is called “downstage coal gas”, its temperature is around 400-550 Celsius degree.

In the carbonation stage, the coals added in the gasifier are dried, preheated and carbonated, generate steam, tar and coal gas, exported from the top of gasifier together, this part of gas is called “up-stage coal gas”, its temperature is around 100-150 Celsius degree.

3.Technical parameter of the two-stage coal gasifier

Specification			YSQ 2.0	YSQ 2.6	YSQ 3.0	YSQ 3.2	YSQ 3.4	YSQ 3.6	YSQ 4.0
I.D. of chamber (mm)			2000	2600	3000	3200	3400	36000	4000
Gasification area(m2)			3.14	5.31	7.07	8.04	9.07	10.17	12..56
Applicable coal			Non-caking or weak-caking anthracite bituminous coal
Coal granularity			20~40,25~50,30~60
Coal consumption		Min	785	1327	1766	2010	2269	2543	3140
		Max	1036	1751	2331	2653	2995	3357	4145
Gasification agent			Air+Steam
Air consumption (m3/kg)			2.2~2.8
Steam consumption (m3/kg)			0.3~0.5
Coal gas heat value			6060~6270
Coal gas outlet pressure		Up stage	1.2~2.0	1.2~2.0	1.2~2.0	1.2~2.0	1.2~2.0	1.2~2.0	1.2~2.0
		Down stage	1.5~2.5	1.5~2.5	1.5~2.5	1.5~2.5	1.5~2.5	1.5~2.5	1.5~2.5
Coal gas outlet temperature			400~550
Max blast air pressure at the bottom of the gasifier			7000	7000	7000	7000	7000	7000	7000
Saturated air temp.(°C)			50~65
Coal feeding mode			Coal feeding automatically
Coal feeder driving device			Hydraulic driving
Ash discharging mode			Automatically wet ash discharging
Max speed of the ash tray			2.97	1.7	1.7	1.5	1.5	1.5	1.5
Ash tray driving power(kw)			7.5	7.5	7.5	11	11	11	11
Coal gas output(Nm3/h)	Min		2355	3980	5299	6029	6860	7630	9420
	Max		3109	5254	6994	7958	8984	10072	12434