On March 16, at the "2023 China Cement Industry Summit" hosted by China Cement Network, Qi Yanyong, an associate professor of Southwest University of Science and Technology, brought a brilliant report on the theme of "Operation and Control of Cement Kilns under the Goal of" Double Carbon ". Qi Yanyong mainly shared the distribution of energy consumption in the kiln system, the optimization of waste heat power generation, carbon reduction, consumption reduction and production increase.
Qi Yanyong believes that the grate cooler is an important part of the new dry process cement production, and its work not only directly affects the quality of clinker , waste heat power generation, heat recovery into the kiln, but also plays a vital role in the stable operation of the whole kiln. He said that the grate cooler is the core of coal saving in the kiln system, and the operation effect of the grate cooler of domestic manufacturers is quite different. The temperature of the secondary and tertiary air of the grate cooler in good operation can reach 1200 ℃ and 1050 ℃, and the standard coal consumption is only 98 kg/t, cl. The temperature of the secondary and tertiary air of the grate cooler in poor operation is only about 1000 ℃ and 800 ℃, and the standard coal consumption is as high as 110 kg/t. Cl. The main factor affecting the heat exchange efficiency of grate cooler is "wind short circuit". If the kiln system wants to achieve the goal of high production and low consumption, it is necessary to improve the heat recovery efficiency of the grate cooler, avoid the phenomenon of "air short circuit" and increase the air volume into the kiln. In the actual production process,
most manufacturers have not found an effective way to improve the temperature of the firing zone, resulting in low quality of rotary kiln and high coal consumption. Qi Yanyong said that the temperature of the firing zone is the core of the quality of the rotary kiln. When the temperature of the firing zone is high, the rotary kiln has strong anti-fluctuation ability, and the quality of the clinker can be greatly increased. When the temperature of the firing zone is high, the radiation heat transfer can account for more than 90% of the total heat transfer. When the material temperature is 1350 ℃ and the gas temperature is increased from 1600 ℃ to 1900 ℃, the radiant heat transferred from the gas to the material can be increased by 2.86 times. It can be understood that there is still room to double the output of rotary kiln.
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