Indirect Coal-Fired Hot Air Furnace

Indirect Coal-fired Hot Air Furnace

Operating Preinciple

MBH indirect coal-fired hot air furnace consists of MBL coal burner, high-temperature purifying room and, and heat exchanger. Bituminous coal (soft coal) is fed into coal hopper through the coal feeder. The coal at a certain height is delivered into burning heath of of coal burner by chain grate. Combustion fan sends air into burner, hot gas produced by burning coal erupts from fire outlet of coal burner and enters in high-temperature purifying room,.then begins secondary conmbustion.

The dusts in the gas impact, aggregate and subside in the purifying room. Hot flue gas from purifying room mixes reclaimed flue gas, the mixture is sent into flue gas inlet of heat exchanger. Flue gas flows outside the pipe, fresh air flows countercurrent inside the pipe. Flue gas exchanges heat with fresh air. Part of flue gas is reclaimed, the rest is exhausted. Hot clean air out from heat exchange at the suitable temperature flows into dryer for drying. Temperature of hot ait can be adjustable according to the demand. When hot air is supplied continuously, its tempreature fluctuates within ± 5 deg.C. The cinder is discharged from the other side of coal burner by cinde conveyor.

Technical Performance Of MBH Indirect Coal-fired Hot Air Furnace

1.There is emergency rotecting equipment response to incidents such as sudden power failure.
2.Heat ecchanger contains jet pipe and plug in pipe, the air whirls in pipe at a high speed, which reduce the heat resistance, lengthen the exchange time, and increase the heat exchange factor.
3.Heat exchanging system of MBH indirect coal fired hot air furnace is countercurrent heat exchange, i.e. flue gas flows outside the pipe, fresh air flows inside, which strengthen the heat exchange.
4.It adopts the secondary combustion and purifying equipment for the hot flue gas, makes the temperature of flue gas enter into heat exchange evenly and stably,prevents the flame from buring heat exchange locally, which meanwhile reduce the tar content and dust content that enter the heat exchanger,reduce the wastage of heat exchanger and dust accumulation, increase the heat efficiency, and lengthen the life-span.

Advantages of Indirect Coal-fired Hot Air Furnace

1.Total heat efficiency>75%.
2.Long ash-removing interval of furnace.
3.Hot air tempreature fluctuates within ±5 deg.C.
4.High heat capacity, up to 20 million kical per hour.
5.Hot air temperature at outlet can reach up to 650 deg.C
6.Heat exchanger has long lifespan, low maintenance cost
7.There is no black smoke in tail gas. Meet the dmand of environmental protection. Good operating conditions.

Applications of Indirect Coal-Fired Hot Air Furnace

There are differnt models of indirect hot air furnaces can be selected, (heat capacity ranges from 0.25 to 20 million kcal per hour, heating temperature range 50~650 deg.C). Hot air furnaces can be used to dry chemicals, foodstuffs and medicines etc. We can provide different modls and configurations in therms of customer’s demands.