"Continuous energy saving and consumption reduction is the best tool for cement enterprises to meet the challenges." Faced with the current downward demand for cement, the intensification of the contradiction between supply and demand, and the plight of the downturn in the market, many people in the industry expressed the above views.
However, the cement production process is complex and there are many cement equipment, which link can make the most significant effect of energy saving and consumption reduction? Qi Yanyong, an associate professor at Southwest University of Science and Technology, once said that the core part of the kiln head is the grate cooler, but the cement industry's understanding of the grate cooler is far from enough.
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. "From the point of view of energy consumption, the standard coal consumption can only be reduced by 0.8 kg if the flue gas temperature at the outlet of the primary cylinder is reduced by 10 degrees, while the standard coal consumption can be reduced by 4 kg if the temperature of the secondary and tertiary air is increased by 100 degrees." Qi Yanyong explained that the key factor for the high final output and good quality of the kiln system is that the firing temperature should be high enough, and the core of the high firing temperature is the high temperature of the secondary air. In the final analysis, all this is achieved by the grate cooler.
Since the grate cooler plays such an important role in cement production, why is the upgrading and transformation of the grate cooler in the industry slightly inadequate?
"Grate cooler has two characteristics, one is mechanical transportation, the other is heat exchange, the efficiency of heat exchange is reflected in the temperature of secondary and tertiary air, that is, to get the highest possible temperature of secondary and tertiary air with the smallest possible air volume, but in the past, the cement industry simply regarded the grate cooler as a mechanical equipment to manage and maintain." Ignoring its important characteristics as a thermal equipment. Qi Yanyong believes that it is for this reason that the industry pays insufficient attention to the grate cooler.
In order to improve the thermal performance of grate coolers in the cement industry, Qi Yanyong said that it can be done by setting up industry benchmarks, equipping with relevant instruments, eliminating wind short circuit, and using expert system diagnosis to control the heat exchange characteristics and fluid state of grate coolers. What are
other ways to improve the efficiency of the grate cooler? Where can we start with the transformation of cement kilns under the target of double carbon? On March 15-16, China Cement Network will hold the " 2023 China Cement Industry Summit " in Hangzhou, Zhejiang Province, to discuss in depth the macroeconomic trend and the development direction of the cement industry, gather the power of the spark, promote the high-quality development of the industry and create a better future. At that time, Qi Yanyong will make a wonderful speech at the meeting. Hurry to sign up!
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