Gas fuel rotary kiln (gas-fired rotary kiln) is rotary kiln equipment that uses gas as fuel. Gas as fuel generally includes coal gas, liquefied petroleum gas, and natural gas. The combustion devices used in the gas fuel rotary kiln include coal gas burner, liquefied petroleum gas burner, and natural gas burner according to the gas type. The number of burners used and the installation layout are basically the same as those of the oil-fired rotary kiln. The gas fuel rotary kiln also adopts the open flame combustion mode and has the characteristics of high heating speed.
Analysis of Different Types of Fuel in Gas-Fired Rotary Kiln
The calorific value of coal gas is low, generally 5400kJ/m3, and it is impossible to obtain a higher flame temperature.
The calorific value of liquefied petroleum gas(LPG) is relatively high, generally in the range of 22500~62800kJ/m3, and it is convenient to use as long as there is a transformer equipment. The gas and liquid volume ratio of LPG is up to 250:1, which is conducive to liquid storage, transportation, and gas use. The investment of storage and transportation station, transformer equipment is large, and safety management is also very important. As the fuel of gas-fired rotary kiln, liquefied petroleum gas (LPG) has no smoke, ash, and residue after combustion, which is cleaner than oil and coal gas.
The calorific value of natural gas is not as high as that of liquefied petroleum gas, but in some countries with abundant natural gas reserves, cement rotary kilns used in cement production mostly use natural gas as the main fuel. Natural gas can replace oil fuel and raw coal as the main fuel of rotary kiln. Compared with coal fuel rotary kilns and oil fuel rotary kilns, natural gas can effectively improve the combustion utilization rate of the kiln and improve and reduce the environmental pollution caused by combustion products.
Characteristic Design of Gas Fuel Rotary Kiln Combustion System
The combustion system of the gas fuel rotary kiln is mainly composed of a gas burner, a gas ignition system, a flame detection system, an air casing, a transition pipe, a nozzle, a nitrogen purge/release device, a fixed frame, a combustion fan, and other components.
The design of the combustion system of the gas-fired rotary kiln is in accordance with the characteristics of the process of low-medium temperature roasting rotary kiln, that is, the temperature requirement of the high-temperature belt is 700~850℃. Therefore, the design should consider avoiding the violent partial combustion of gas and causing product quality problems. In the selection of gas burners, it is required not only to have the advantages of ordinary burners but also to eliminate violent combustion. The purpose of improving the burner of the gas fuel rotary kiln is to make the temperature field distribution in the rotary kiln more reasonable, which is not only suitable for the process characteristics of the medium and low-temperature rotary kiln but also conducive to the continuous operation of the gas fuel rotary kiln.
The new gas-fired rotary kiln burner is equipped with an ionization electrode flame monitor. If the flame is extinguished, the quick stop valve on the gas pipeline will be automatically cut off, which is safe and reliable. The gas volume can be adjusted at any time according to the temperature in the kiln, which is convenient to control. The new type of gas-fired rotary kiln combustion system is safe and reliable, simple and convenient to control, and is the first choice for customers.
Influence of Different Gas Types on Gas Fuel Rotary Kiln
Coal gas, natural gas, and liquefied petroleum gas have their own advantages in cost, easy access, and environmental protection. When choosing the fuel of the gas fuel rotary kiln, the customer should not only consider the advantages and disadvantages of the fuel but also consider its own situation. If the factory is located in a liquefied petroleum gas production area and it is very convenient to obtain liquefied petroleum gas, liquefied petroleum gas can be considered as the preferred fuel for gas-fired rotary kilns. For example, if there are gas storage and transportation station near the plant, priority should be given to using gas as fuel for the carbon rotary kiln or activated carbon rotary kiln.
Agico’s technical team can provide design suggestions for the selection of gas-fired rotary kiln products. You only need to provide the rotary kiln processing materials, annual output, and requirements for finished products, then leave a message to our inquiry form, and our technical engineers will contact you to design the scheme for you.
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