national policy of further promoting the ultra-low emission transformation of the cement industry and fighting the battle of defending the blue sky, recently. The SCR transformation project of ultra-low emission kiln tail flue gas treatment in the whole process of cement clinker production line of Xinjiang Tianye Cement Industry has been successfully put into operation. This breakthrough not only makes the treatment of nitrogen oxides in six cement clinker production lines of the enterprise reach the advanced level of the industry, but also injects strong impetus into the prevention and control of air pollution in Wuchangshi area with the innovative practice of environmental protection in the whole waste residue production scene, and sets up the industry benchmark of flue gas treatment in carbide slag cement production line.
At present, China's cement industry is in a critical period of green and low-carbon transformation. The Ministry of Ecology and Environment explicitly requires that 50% of the cement clinker production capacity in key areas should be transformed into ultra-low emission by the end of 2025, and 80% of the national production capacity should be transformed by the end of 2028. As a key industry of energy consumption and pollutant emission, the ultra-low emission transformation of cement industry has become the only way for high-quality development of the industry, while the flue gas treatment of the whole waste residue production line has always been a technical difficulty in the industry due to its complex working conditions.
The targeted breakthrough of Tianye Cement is to tailor the SCR denitrification system for each production line, and innovatively arrange the reactor behind the bag-type dust collector at the kiln tail and in front of the tail exhaust fan, forming a "precise SNCR + SCR" combination process. After the transformation, the emission of nitrogen oxides is stably controlled below 50mg/m ³, the ammonia escape is ≤ 5mg/m ³, the ammonia consumption per ton of clinker is less than 3.5kg, and all indicators strictly meet the requirements of the national ultra-low emission standards. Particularly noteworthy is that the system has strong adaptability to complex working conditions, perfectly matches the production characteristics of full waste residue, does not interfere with the normal operation of the production line after putting into use, realizes the seamless connection between environmental protection upgrading and production efficiency, and solves the synergistic problem of waste residue utilization and deep pollution control.
As an important participant in the ecological protection of the northern slope of Tianshan Mountains, the transformation of Tianye Cement Industry in Xinjiang has provided key support for the environmental protection management of key industries in Wuchangshi region. At present, the Wuchangshi region is making every effort to promote the prevention and control of air pollution, and the ultra-low emission transformation of Tianye Cement Industry in Xinjiang has achieved phased results. Through technological innovation, the ultra-low emission of the whole process has been achieved, which not only greatly reduces the emission of nitrogen oxides in the region, but also promotes the coordinated mode of "resource recycling + deep pollution control". It provides a replicable and popularizable practical scheme for the green transformation of regional industrial enterprises.
"This SCR transformation is a decisive measure for Tianye Cement to achieve the goal of reducing pollution and carbon and promote green and low-carbon transformation." The project manager said. In the next step, the enterprise will continue to deepen the innovation of environmental protection technology, comprehensively implement the new development concept, adhere to precise pollution control and scientific pollution control, and do a solid job in project evaluation, monitoring and publicity in promoting the upgrading of clean transportation and the fine management and control of unorganized emissions, so as to win the battle of defending the blue sky in Wuchangshi area and contribute to the high-quality development of the ecological environment on the northern slope of Tianshan Mountain.
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