Dryer equipment heat source fuel from solid fuel, liquid fuel, gas, heat carrier, and electricity, specifically, the main variety of combustion products (coal, natural gas, liquefied petroleum gas, flammable chemical gases) and air combustion products, steam, hot water, electricity (Tao Sheng oil). Drying heat source can not be blindly select, must follow certain principles, the following considerations is to select the drying heat source principle: 

 Procurement easy - select the heating of raw materials to local conditions, take into account both the cost of a variety of heat sources, but also consider the easy to obtain. 

 The quality of security - according to the items being dried and dried product quality requirements for the cleanliness of the heating temperature, and heat to make the corresponding analysis; but also to ensure that the heat source is easy to control, so you can ensure the stability of the drying sex. 

 Environmental protection - some of the burning heat source in the course of combustion, odor or smoke venting to the atmosphere will cause pollution, the heat source should be used cautiously. 

 Security - this direct-fired heat source is more important, some dry material is flammable, explosive or easily oxidized to deal with this material is best to use indirect heat exchanger of the heat source, use direct-fired to be a special flame-retardant or explosion-proof measures. 

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