Technical field:
This product relates to the rotary kiln gas combustion system used in metallurgical industry, especially to a low-pressure rotary kiln gas combustion device.
Background technology:
At present, the common gas combustion system of rotary kilns in metallurgical industry in China is to build a gas pressurization station around the rotary kilns, equipped with several high-power roots blowers to convert low-pressure gas into high-pressure gas to meet the production needs.This high-pressure gas combustion system has the following disadvantages: 1. Each start-up and shutdown of a gas pressure station is complex, labor-intensive, and requires special monitoring; 2.2. The burner flame of the combustion system is concentrated, the combustion injection speed is fast, the flame injection distance is long, when the rotary kiln reaches 1250 degrees, the high temperature area extends to the end of the kiln.The temperature of the front grate preheating section of the kiln tail can reach 1150 ~ 1200℃ when the temperature is 1300℃, and the temperature of the grate should not be higher than 1100℃ for a long time.Therefore, the grate operation under high temperature often causes great damage to the equipment. The grate bars are often shut down for maintenance due to combustion.3. Slow temperature rise of combustion system.In order to reach the normal roasting temperature after ignition, a large amount of heat must be provided by the hot air of the annular cooler, which takes more than 24 hours, wastes a large amount of gas, and even affects production.4. The pressure station system has many faults, which have great impact on production, long maintenance time, high cost and large power consumption.
The low pressure gas burning device of rotary kiln can cancel the pressurized gas station, ensure the flame intensity and length stability of gas burner under low pressure gas condition, and the temperature can meet the production needs.
Solution: including the center burner, the gas nozzle vortex blade and the air nozzle vortex blade, the gas nozzle vortex blade and the air nozzle vortex blade Angle of 15-30 degrees.
In the above scheme, the diameter of the central burner can be more than 600mm, which makes the temperature of kiln tail and furnace head easy to be controlled below 1050℃, and the flame intensity radius can be reduced to eliminate local overburning of furnace lining.It can also eliminate ring formation of kiln lining.
Product advantages: 1. Cancel the air pressure station, reduce the labor intensity of the workers, reduce the unsafe factors in production, so that the production is not affected by frequent failures of the air pressure system; 2.2. Increase the diameter of the central burner by changing the Angle of the rotating blade of the gas nozzle and the rotating blade of the air nozzle.The temperature difference between kiln end and kiln end is generally about 250℃ in the working process.When the kiln reaches 1300℃, the temperature of kiln tail and grate can be easily controlled below 1050℃, which greatly improves the service life of kiln tail and grate, and eliminates partial excessive combustion of furnace lining caused by reduction of flame intensity radius.3. The combustion system can meet the process requirements in a few hours, and the temperature can meet the production needs in a short time.4. Reduce investment and downtime, save energy and improve economic efficiency.
This product includes intake pipe, center burner, gas nozzle swirl vane and air nozzle swirl vane
In the production system, the gas pressure system is completely eliminated, the diameter of the central burner is increased to over 600 mm, and the number of gas cyclones is increased.The Angle of the gas and air cyclones varies from 15 to 30 degrees depending on the length, intensity, and width of the flame.Using the original pipeline gas direct combustion burner can not only meet the process temperature requirements, but also ensure low consumption and high efficiency of production.The gas pressurization system has been completely eliminated.The gas can be burned at a low pressure below (2 kPa) to reach the desired temperature.
Cancel gas pressure station system, reduce investment.
