Two Stages Cold Coal Gas Gasifier

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Two stages cold&clean gas station

F 2.0 m ~F4.5 m two stages cold&clean gas station, equiped with phenol water processor, realize zero discharge of phenol water, save the cost of phenol water treatment, has significant economic benefits; wet desulphurization system can make SO2 in kiln exhaust gas emissions meet the national environmental protection requirements.

specification parameter item				specification of coal-gasifier
				f2.0M	f2.6M	f3.0M	f3.2M	f3.4M	f3.6M
Gasifier body	Dia.of chamber(mm)			2000	2600	3000	3200	3400	3600
	Chamber cross-section area(m2)			3.142	5.309	7.069	8.042	9.079	10.179
fuel	Max coal consumption(kg/h)			1000	1750	2350	2650	3000	3360
	species			According to GB9143-88 standard;Anthracite?Non-caking coal?Lignite?Coking coal
	Coal particle size(mm)			13~25,25~50
gas	Theory output(Nm3/h)			1500~3300	3600~5700	5000~7700	6300~8700	6600~9900	8000~11000
	Heating value range(KJ/Nm3)	upper stage		7270~7650
		down stage		5000~5600
		mixed		6060~6270
	basic ingredient(%)			CO:=25;H2:12~18;CH4:1~3;N2: 45~50;O2:0~0.4;CO2: 4~8
	Outlet pressure(Pa)		upper stage	1500~3000
			down stage	2000~4000
	Outlet temperature(oC)		upper stage	100~120
			down stage	400~550
function	intensify of gasification(kg/m2h)			anthracite:˜220 soft coal:˜330 coke:˜200
	rate of gasification(Nm3/kg)			anthracite:3.0~3.5 oft coal:3.0~3.5 coke:˜4.0
	heating capacity in theory(104kcal/h)			225~495	540~855	750~1155	945~1305	990~1485	1200~1650

Brief description of the process of two stages cold and clean gas station

Our company produces the two stages gas station belongs to fixed-bed type and continuous blast air gasifier,made up of carbonization and gasification segment from top to bottom.at first,the coal drop into the gasifier body through two sets of coal-loading valve from coal bunker at the top of gasifier.after sufficient drying and long time of low temperature carbonization,the coal changed into carbocoal gradually in carbonization segment,and then drop into gasification segment.the broiling carbocoal and gasification agent blasted from bottom of gasifier will full reaction in gasification segment,the coal will be changed into ash through reduction layer and oxidation layer,and discharge automatic from ash tray by drived grate bar.

producing and cleaning of gas from gasifier top

At first,the coal will be evaporated (90~150?)in process of low temperature carbonization,then taken off the volatile matter(150~550?).the volatile matter contains the tar,alkane gas,phenol and H2?CO2?CO?H2O,the gas of top gasifier is mixed by retort gas and a part of gas from gasification segment,that accounts for about 40% of the total amount of gas.its higher heat value(7400KJ/NM3),lower temperature(120?)and contains plentiful tar.the gas of top gasifier take off the tar through the electric tar arrester(90~120?),then goes into intercooler.the tar yield is uncertain with different coal type,that account for about 3~6% of the total amount of coal.it can be used chemical materials or fuel .(the heat value is 9000kcal/kg above)

producing and cleaning of gas from gasifier bottom

In gasification segment,the broiling carbocoal and gasifying agent will generate the gas by oxidation,reduction and a series of chemical reactions,that compose of bottom gas,called gasified gas,which account for about 60% of the total amount of gas.its lower heat value (6000KJ/NM3),higher temperature(450?).the bottom gas contains a small amount ash because of near the ash layer but not contains tar because the coal become carbocoal by enough low temperature carbonization time in carbonization segment.at first,the bottom gas (400~550?)will be dust removaled by cyclone dust collector,and then goes into phenol-water evaporator,(the temperature will fall to about 200?)then goes into wind cooler(the temperature will fall to about 80?),at last the bottom gas and the top gas mix and goes into intercooler.

cleaning of mixed gas
The temperature of mixed gas will fall to about 35~45? in intercooler,then goes into electric light oil arrester,the light oil and ash will be taken off,become phenol-water mixture contains light oil.but the weight of light oil is lighter than phenol water layer,so it can be separated.at last,the compressed gas supply to user by gas pressurizing booster fan.

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