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Rotary dryers

Double-section Coal Gasifier

Feed Granularity】: ≤50mm   
【Applications】: it is applied to production industries such as metallurgy, drying, chemistry, building materials, refractory materials and fertilizer.  
【Materials】:non-caked and weak bonding bitumite and anthracite
【Product introduction】: high thermal value; less coal consumption; convenient to operate; friendly to environment; large amount of by-product tar produced; good quality of tar;


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Coal gasifier is divided into two kinds, single-stage and double-stage. Double-stage coal gasifier can also be called two-stage coal gasifier. Furnace body of double-stage coal gasifier can be divided into two parts, upper part and lower part. Raw materials are sent to upper part of coal gasifier by bucket elevator and the materials are distilled. Then, semi-coke is formed. The whole process for coal gas production is finished in coal gasifier. Coal gasifier is specially designed for gasifying bitumite. It has many advantages of high thermal value, environmental protection, large amount of by-product tar and good quality of jar. The coal gasifier developed by our company is characterized by good heat transfer effect, complete distillation, easy structure and convenient maintenance.
1. Less pollution: coal gas at lower section is got from coke after pneumatolysis and distillation. There is almost no jar contained in coal gas, which makes coal gas at lower sections of coal gasifier cooled down after extreme cold. Large amount of sewage caused by direct contact between water and coal gas is avoided. Then, sewage discharge will be avoided and no pollution is caused to environment. Because quench water system is deficient in water, there is no sewage discharged out. Water recycling use can be improved by settlement treatment. It is easy to dispose.
2. Gasification intensity and comprehensive efficiency are higher than single-stage coal gasifier; can adapt to various coals, especially bitumite. Closed circuit is adopted for coal production in coal gas station. No sewage and air pollution is caused to environment. It saves a lot of water resources. With advantage of environmental protection, it holds much less running cost.
3. Owing to a distillation section added in double-stage coal gasifier, coal is heated gradually in distillation part and distilled with low temperature. All tar produced will not be decomposed. The stickiness of tar is low and with good fluidity.
4. Tar produced in upper coal gasifier is mainly light tar; less dust brought out; coal gas is purified by electric light and electric catching focal treatment. 


Coal adding section: coal position detector is installed in this section; automatic coal adding is realized by cooperation of coal position detector and stoker; full stock operation is guaranteed;
Distillation section: liner in furnace; this structure is designed after precise heat transfer and heat exchange calculation. Heat transfer efficiency is improved, which makes coal used for gasifier dried and distilled fully and effectively. Then, volatile fraction is separated out, which will improve the thermal value of coal gas and benefit the gasifying of coal gas at lower section.
Gasification stage: adopt water jacket structure; steam produced by itself for gasification at furnace bottom;
Coal feeding mechanism: Adopt advanced upper cylinder to add coal mechanism under bell cover; easy operation; simple maintenance; good air tightness;
Ash cleaning mechanism: adopt ratchet pawl and hydraulic drive to remove ash at two sides; big ash knife is designed with self-designed plough ash removing knife; reliable and stable transmission; smooth ash removal; plough ash removing knife developed by our company has been applied to many gasifiers at home and abroad. It enjoys good reputations among its users. 

Technical Parameters:
2.0 2.4 2.6 3.0 3.2 3.6
Diameter of furnace
2000 2400 2600 3000 3200 3600
Size of fuel
Fuel consumption
800-920 1200-1400 1400-1600 2000-2100 2100-2500 2500-3500
Coal gas output
2500-3000 3600-4200 4200-5200 6000-6500 6500-8000 8000-11000
KJ/ m³
Thermal value of coal
7100-7500 7100-7500 7100-7500 7100-7500 7100-7500 7100-7500
Lower part 5016-5643 5016-5643 5016-5643 5016-5643 5016-5643 5016-5643
Mixing 6186-6690 6186-6690 6186-6690 6186-6690 6186-6690 6186-6690

Outlet temperature of coal gas
Upper part 100-150 100-150 100-150 100-150 100-150 100-150
Lower part 500-600 500-600 500-600 500-600 500-600 500-600
outlet pressure:K Pa Upper part <1
Lower part <1.5
K pa
Air pressure of furnace bottom

Saturation temperature
K pa
Steam pressure of water jacket
Steam output of water jacket
300 400 450 500 550 650
Rotary speed of ash basin
2.97 2.3 1.7 1.5 1.5 1.5
Transmission power of ash basin
3.0 4 5.5 5.5 5.5 7.5
Power of hydraulic station
K pa
Gland steam pressure of fire detector
Fuels available Non adhesive and weakly bonded bitumite and anthracite; the quality of coal should conform with GB/9143.
Diameter of coal gas outlet
Upper part DN250 DN300 DN300 DN400 DN400 DN600
Lower part 400x400 766x766 766x766 866x866 866x866 1000x1000
Diameter of blast pipe at  furnace bottom DN250 DN300 DN300 DN400 DN400 DN600
Total power
40 55 70 100 150 190
Slag discharge form Wet type, automatically discharge slag;  
Note: No further notice if the technical parameters change.

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