Operating principle   

     MBL coal-burning hot air furnace consists of MBL coal burner, hot gas purifying chamber, and air mixing chamber. Coal burner supplies the primary heat. Raw (soft) coal is fed into the coal hopper through the coal feeder. The coal at a certain height is delivered by chain grate into the burning chamber of coal burner. With the help of combustion fan, hot semi-coal gas produced by burning coal erupts from fire outlet of coal burner and enters in hot gas purifying chamber. The chamber is built of fire resistant materials; hot semi-coal gas begins secondary combustion in purifying chamber. The particles impact, aggregate and drop in the purifying chamber. Clean hot air from purifying chamber at about 1000℃ then mixes into a certain amount of cool air, the mixture at the suitable temperature flows into dryer(such as spray tower, rotary kiln, flash dryer etc.)for drying. Temperature of hot air can be adjustable according to the demand. When hot air is supplied continuously, its temperature fluctuates between ±5℃. Cinder is discharged from the other side of coal burner by tapping machine.

Advantages

（1）、Meet the demand of environmental protection. No secondary pollution, good operating conditions.

（2）、Hot air is as clean as  that by burning oil, dust content is between 30 to 120 mg/Nm³

（3）、heat efficiency >95％

（4）、Temperature of hot air can be easily adjustable between 100 to 800℃. When hot air is supplied continuously, its temperature fluctuates between ±5℃.

（5）、Operate simply, adjust easily.

（6）、High security, there is no danger of explosion.

（7）、Equipment is durable, low cost of operation, easy maintenance.

Applications

compound fertilizer, DAP, MAP, potassium sulfate, potassium chloride, potassium  phosphate monobasic and so on.

Relevant customers

Sino-Arab Chemical Fertilizer Co., Ltd.( compound fertilizer)    Zhonghua Kailin Group (DAP)    Qinghai Salt Lake Yuantong Kalium Fertilizer Co., Ltd.( potassium chloride)     Guizhou Chuanheng Chemical Co., Ltd.(MAP, calcium phosphate monobasic)

Specifications of hot air furnace