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Rotary kiln burner
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Description
The heat of the rotary kiln is provided by the burner of the rotary kiln. The burner plays a very important role in the calcination process of the rotary kiln. It not only provides fuel and oxidant for combustion, but also the main power unit for flame forming.
The commonly used fuels for rotary kiln burners are pulverized coal, coal gas, natural gas and heavy oil. Generally selected according to process requirements, local resources and supply conditions. When using pulverized coal as fuel, because the silica in the coal will contaminate products, kilns that have strict requirements on product quality, such as alumina calciners, carbon kilns and certain heavy non-ferrous metallurgy kilns, cannot be used Pulverized coal. The adjustment of gas is more flexible, but if natural gas is produced at the gas station specially built in the factory, the investment is too high. If using process gas, control the flame temperature. Some small external heating kilns (rotating tubes) are heated by wires. Choose the corresponding burner according to the different fuel of the rotary kiln used.
Most of the burners of the rotary kiln pass through the kiln head cover, extend into the kiln head cylinder, and heat the material to the required temperature through flame and radiation. Burners have various forms such as coal injection pipes, oil spray guns, gas nozzles, etc., depending on the type of combustion. When the reaction temperature is low, a combustion chamber is set beside the kiln head cover to pass hot flue gas into the kiln to supply heat.
Rotary kiln burners are also called multi-channel burners, three-channel burners and four-channel burners. The rotary kiln burner is suitable for fuel pulverized coal, blue coal, natural gas, liquefied gas, coal gas, light oil, heavy oil, residual oil, mixed oil, etc.
BNRK series pulverized coal cement rotary kiln burner:
Power range: 200~20000kW
Applicable fuel for rotary kiln burner: pulverized coal, semi-coke, rice bran, wood flour, biomass pellets. Can be designed for dual fuel types, pulverized coal and natural gas, pulverized coal and diesel.
Rotary kiln burners are mainly used in cement kilns, pellet kilns, lime kilns, lithium kilns, magnesia kilns, alumina kilns, chromium salt kilns, mineral processing kilns and other building materials, metallurgy, chemical, electric power and other industries.
According to technical requirements, rotary kiln burners can be designed as two-channel, three-channel, four-channel and five-channel burners.
The design requirements of the rotary kiln burner:
1. Strong adaptability to the quality of coal powder.
2. The shape of the flame is thin but not long, so the entire combustion zone has strong and uniform heat radiation.
3. The primary air volume is as small as possible, but the stability of the kiln's combustion under abnormal conditions must be ensured.
Technical characteristics of the newly developed rotary kiln burner of our company:
1. It has a good flame shape, reduces the peak temperature of the flame, and has a good heat flow distribution.
2. By reducing the primary air volume by 4% and replacing it with high-temperature reflux flue gas (700-1100°C), fuel combustion is more complete, saving about 1.5% of fuel.
3. Simplify the flame shape adjustment process and expand the adjustment range.
4. Due to the decrease of flame temperature peak and the increase of high-temperature reflux flue gas, the production of NOx has been greatly reduced.
Successful project：
Advantages of multi-channel burners:
(1) Increase the mixing of pulverized coal and combustion air, increase the combustion rate, and the fuel will burn completely and stably.
(2) Increase the means of adjusting the air volume and wind speed of each channel to make the flame shape and temperature adjustment flexible and convenient, suitable for clinker calcination.
(3) The burner has a long service life.
(4) Protect the kiln lining material and prolong the service life of the lining.
(5) Stabilize clinker quality and increase system output.
(6) Simple structure, convenient maintenance and replacement, reducing the operating time of the system due to burner failure.
(7) Minimize the amount of primary air, increase the use of high-temperature secondary air, and increase the utilization rate of the heat recovered by the clinker.
(8) The system resistance is as low as possible to reduce the power consumption of the primary fan.
(9) It can reduce the emission of harmful substances (especially NOx).
(10) Low-grade fuel can be used to strengthen the comprehensive utilization of fuel, and lower equipment prices and maintenance costs.
Performance of three-air-channel rotary kiln burner:
Power range: 200~20000kW
Single burner adaptation: 500~10000t/d production line
Applicable fuel for three-channel burner:
•Pulverized coal, blue charcoal
•Natural gas, liquefied gas, coal gas, light hydrocarbon gas, etc.
•Light oil, heavy oil, residual oil, mixed oil
Rotary kiln burners are mainly used in:
Various types of kilns such as cement kilns, pellet kilns, lime kilns, lithium kilns, magnesia kilns, alumina kilns, chromium salt kilns, beneficiation kilns, etc. in the building materials, metallurgy, chemical, electric power and other industries.
According to process requirements, it can be designed as two-air duct, three-air duct, four-air duct, and five-air duct burner.
Burner performance of four air duct rotary kiln:
Power range: 200~20000kW
Single burner adaptation: 500~10000t/d production line
Applicable fuel for four-air duct burner:
•Pulverized coal, blue charcoal
•Natural gas, liquefied gas, coal gas, light hydrocarbon gas, etc.
•Light oil, heavy oil, residual oil, mixed oil
Rotary kiln burners are mainly used in:
Various types of kilns such as cement kilns, pellet kilns, lime kilns, lithium kilns, magnesia kilns, alumina kilns, chromium salt kilns, beneficiation kilns, etc. in the building materials, metallurgy, chemical, electric power and other industries.
According to process requirements, it can be designed as two-air duct, three-air duct, four-air duct, and five-air duct burner.
Rotary kiln burner model parameters：
Rotary kiln burner model parameters：
Successful project：