Hebei Jinyu Dingxin Cement Co., Ltd.
In the company's intelligent monitoring hall, a whole wall of electronic screens is particularly noticeable, and the important links of cement production are presented on different small screens in real time, which is clear at a glance. Liu Zhe, manager of the second branch of Hebei BBMG Dingxin Cement Co., Ltd., told the reporter: "The main process of cement production is'two mills and one burning '. Here, we can keep abreast of the emission of pollution sources in each link of the'two mills and one burning' process through the screen and intelligent monitoring platform."
He explained that according to the production process as follows: First, the calcareous raw materials, clayey raw materials and a small amount of calibration raw materials are mixed and ground in proportion to form raw materials; Then calcining the raw materials in a cement kiln at high temperature until the raw materials are partially melted to obtain silicate cement clinker with calcium silicate as a main component; and finally, adding a proper amount of gypsum or a proper amount of mixed materials or additives into the clinker, and grinding the clinker into cement.
"Two mills and one burning are most likely to cause pollution in the middle of the burning link, and the main emissions are nitrogen oxides." Liu Zhe pointed to the real-time value of nitrogen oxides displayed on the computer screen and said, "Now the value of nitrogen oxides is 23 mg/m3, and the latest standard in the province is not more than 100 mg/m3.". Our denitrification (nitrogen oxide removal process) technology is at the leading level in the country and even in the world. SCR denitration equipment of
Hebei BBMG Dingxin Cement Co., Ltd.
Subsequently, Liu Zhe led the reporter to the tall SCR denitrification equipment in the factory area. SCR is the abbreviation of Selective Catalytic Reduction, which can convert nitrogen oxides into harmless compounds such as nitrogen and water vapor to reduce their harm to the environment and human beings.
"Our equipment invested 31.78 million yuan in 2022 to complete the technical transformation of ultra-low emission of denitrification, of which 7 million yuan is the reward and subsidy fund for environmental protection performance.". After the completion of the project, nitrogen oxides dropped from about 100 mg/m3 to 50 mg/m3. Liu Zhe introduced.
He told reporters that environmental performance creation A refers to the process of striving to achieve A-level environmental performance in key industries such as steel, coking and cement. According to the relevant national regulations, the environmental performance is divided into A, B (including B-), C, D and other levels. During the warning period of heavily polluted weather, A-level enterprises can independently take emergency emission reduction measures during the period of heavily polluted weather, without stopping or limiting; B-level, C-level and D-level enterprises take measures to limit or stop production in proportion to their performance levels.
"Creating an A is equivalent to creating a'top student 'in the class, which requires excellent results in all aspects." Liu Zhe said that in order to achieve the goal of creating A, since 2021, the company has invested 110 million yuan in the ultra-low emission transformation of the kiln system. In April 2023, the company built an intelligent environmental management and control platform, equipped with video surveillance of pollution sites, remote intelligent control of fog guns, organized online monitoring data and other functions, using the Internet of Things and big data. It implements 24-hour grid management and control of unorganized emission sources, organized emission sources, air quality and operation status of environmental protection facilities in all directions and without dead corners.
In the factory area of Hebei Jinyu Dingxin Cement Co., Ltd., there is no traditional production workshop, and all equipment is connected through pipelines in an orderly manner. "Inside the pipeline is our transmission belt, raw materials and ores are transported in a closed state, and gravel, ingredients and other processes are carried out indoors.". Due to the use of intelligent inspection in the whole process, the system will immediately warn of pollution problems to prevent any link from leaking. Liu Keqin, Minister of Energy and Environmental Protection of Hebei Jinyu Dingxin Cement Co., Ltd., said. Aerial photo of
Hebei BBMG Dingxin Cement Co., Ltd. Continuing
along the path in the factory area, the reporter clearly felt that the surrounding temperature had risen. A large equipment in operation has attracted the attention of journalists. "This is a rotary kiln for calcining cement clinker, which can produce a high temperature of about 1600 degrees Celsius." Liu Zhe said, "What the cement plant fears most is to stop production, and it will cost hundreds of thousands of yuan to heat up again."
Now is the heating season, according to the regulations, in case of heavy pollution weather, the cement industry needs to stop production at the wrong peak. "Since our environmental performance was rated as A-level enterprise in 2020, we can not stop production and limit production when heavy pollution weather comes, which greatly improves production efficiency and saves production costs." Liu Keqin said.
It is understood that in order to support the environmental performance of key industries to create A work, Hebei Province has issued a series of policies and measures in recent years, such as tax relief and deduction, financial rewards and subsidies for relevant enterprises. Since the beginning of this year, the environmental performance of seven key industries in Hebei Province has been vigorously and orderly promoted. As of November 10, there are 12 new A-level environmental performance enterprises in key industries in the province, totaling 48, including 28 in the iron and steel industry, 8 in the coking industry, 8 in the cement industry and 4 in the flat glass industry.
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