With the acceleration of industrial green transformation, the environmental protection management and operation and maintenance of cement enterprises have entered a refined stage. Under the traditional operation and maintenance mode, the environmental protection equipment equipped on the cement production line is difficult to investigate in time, and the emission index is difficult to control accurately, which restricts the improvement of environmental protection efficiency of cement enterprises. With the advantages of precise monitoring and efficient regulation, intelligent technology provides a new path for cement enterprises to upgrade their environmental protection management.
Recently, China Cement Network interviewed Mr. Wu Shangan, former Secretary-General of Bag Dust Removal Committee of China Environmental Protection Industry Association, former professor-level senior engineer of Hefei Cement Research and Design Institute and senior consultant of China Cement Network. Focus on intelligent technology to solve environmental protection operation and maintenance problems, precise emission control methods, and share the technical path of cement enterprises to improve environmental protection efficiency.
First, the operation and maintenance of environmental protection equipment is the core
of environmental protection governance. Cement enterprises have very prominent operation and maintenance problems in desulfurization, denitrification and particulate matter treatment. Taking ammonia escape as an example, although the target is required to be controlled at 8 mg/standard cubic meter, it is difficult for more than 400 cement enterprises that have completed denitrification to solve this problem. The escape of a large amount of ammonia not only affects the environmental protection, but also corrodes the kiln inlet system and increases the resistance of the bag filter at the kiln inlet. In recent years, there are 5000 t/d production line kiln tail bag dust removal equipment in China, the resistance is too high to run soon, which not only increases energy consumption, but also affects production, and causes carbon emissions.
2. Intelligent operation and maintenance can accurately solve the problem
of ammonia escape. Intelligent environmental protection technology can effectively solve the problem of ammonia escape of SCR denitrification at kiln tail. On the premise of reasonable process, the amount of ammonia injection can be accurately controlled according to the content of nitrogen oxides in the flue gas. The current technical policy requires that the amount of ammonia injection should be controlled below 3.5 kg/ton clinker , and how to accurately control this index can only be achieved through intelligent means to avoid a series of problems caused by the imbalance of ammonia injection.
3. Intelligent optimization of operation and maintenance
of particulate matter treatment equipment For particulate matter treatment, taking the bag filter at the kiln tail of 5000 t/d production line as an example, the air volume under working conditions is nearly 900000 cubic meters per hour, equipped with four or five hundred pulse valves. Manual inspection is carried out once per shift. It is necessary to climb to the top of the equipment at a height of about 30 meters to check the working status of the pulse valves one by one. A dust removal cycle takes more than one hour, and the working environment is harsh. In practice, it is difficult to achieve a comprehensive investigation. If 10% of the pulse valves do not work, the filter area of hundreds of square meters of filter bags will fail and cannot work, and the resistance of the whole system will soar; In addition, the intelligent operation and maintenance of bag filter can also solve the problems of ash unloading failure, bag breaking and leakage detection, automatic adjustment of ash removal program and high system resistance. The intelligent operation and maintenance technology of
bag filter can solve this problem. Through intelligent monitoring, workers, central control room or managers can receive fault alarms on terminal equipment and mobile phones, and accurately notify maintenance personnel to replace the fault valve. A single valve is only a few hundred yuan, but if it is not replaced in time, the system resistance will be too high, which will have a great impact on the whole system, and the operation cost will be greatly increased.
4. Intelligent operation and maintenance of environmental protection economic operation and emission control
can also solve the problems of economic operation and emission of environmental protection equipment. Over the years, the meeting of China Cement Network has emphasized this point, and cement enterprises should pay attention to it. The investment in intelligent transformation is not large, but it is of great benefit to the emission control of enterprises and the reduction of the operation cost of the whole industry.
At present, the cement industry is facing the double test of energy saving, environmental protection and industrial intelligence upgrading. In order to implement the relevant policy requirements and accelerate the green low-carbon transformation and high-quality development of the cement industry, China Cement Network is scheduled for September 23-24. The 14th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and the 6th Intelligent Summit Forum were held in Zibo, Shandong Province.
This conference will bring together industry experts, enterprise representatives and many industry stakeholders to gather group wisdom and promote energy-saving, environmental protection and intelligent transformation and upgrading of the cement industry. During this period, Wu Shangan, together with the delegates, will discuss the problem of ultra-low emission of pollutants in the cement industry and bring a wonderful report. During
the meeting, we will also organize a visit to the demonstration project of Qingzhou Zhonglian Cement Co., Ltd. with an annual output of 200000 tons of carbon dioxide oxy-fuel combustion coupled carbon capture.
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