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At present, the large-scale raw material grinding system for cement production lines at home and abroad has become the mainstream of cement industry development. In 2004, the State proposed to adjust the industrial structure of the cement industry and provide unprecedented opportunities for the development of large-scale NSP cement production lines. The large-scale production line will inevitably impose higher requirements on the large-scale equipment.
According to experts, more than 60% of the electrical energy used in the cement production process is used for the grinding of raw materials and cement. The traditional grinding process is mainly performed with a ball mill. With the ever-increasing scale of the new dry cement production line, infinite magnification of ball mill equipment cannot be realized. As a result, equipment manufacturers all over the world began to develop vertical mills. Vertical mills use the principle of material bed grinding to grind materials. They have high grinding efficiency, low power consumption, large drying capacity, and allow for large particle sizes of powders to enter the mill. Grinding process is simple, small footprint, low cost of civil construction, low noise, small wear, long life, easy operation and so on. At present, more than ten companies at home and abroad have successively developed various types of vertical mills and have achieved success.
Since the 10th Five-Year Plan, the national cement industry policy has encouraged the investment in a new dry process cement production line with a daily production capacity of 5,000 tons, while the large raw material mill for 5,000 tons of production lines has long been dependent on imported products. Based on the experience of absorbing foreign product design and processing, the A number of R&D and processing companies have started to roll out localized equipment. In 2006, Hefei University initiated the project of “Research and equipment development for large-scale raw material vertical mill energy-saving grinding technology†and researched and developed HRM4800 raw material vertical with independent intellectual property rights and capable of meeting 5000 tons/day cement clinker production line. mill.
According to Lei Qianzhi, president of the China Cement Association, the bottleneck that is currently very important in the development of the cement industry is vertical mill. The economic benefits brought by the localization of large-scale cement grinding equipment are also very obvious.
Hefei Cement Institute experts also conducted economic analysis of the HRM4800 raw material vertical mill. Assume that the country will add about 5,000 tons of cement clinker production lines per day to about 20 pieces, and form 40 million tons of cement production capacity. If 20% of the production lines use the research results of this project, then there will be at least 4 to 5 sets of large-scale vertical mills in the stable market each year, with an output value of about 130 million yuan, and profits and taxes of about 8 million to 10 million yuan.
In addition, the raw material grinding system has low power consumption and significant energy saving and consumption reducing effects. Compared with traditional ball mills, cement mills use more than 14.5 million kilowatt-hours of electricity per year per vertical mill. The relevant personnel of the Zhejiang Hushan Group stated that the 5,000 tons/day production line consumes 2.3 million tons of raw materials per year, and the HRM4800 vertical grinding ratio adopts two unloading mills to save electricity by 18.4 million kwh. The annual savings are 0.5 yuan/kWh. The cost is 9.2 million yuan. As cement large-scale equipment has always been in a monopoly position abroad, and the domestic production of large-scale vertical mills, the prices of spare parts conditions are reduced by about 50% compared with imported equipment.
China Cement Association Secretary-General Kong Xiangzhong believes that in the development process of the new dry process cement, the 5,000 tons of vertical mill has great significance for energy conservation and emission reduction. As electricity consumption is reduced, coal consumption is reduced, thereby reducing carbon dioxide emissions. In addition, there is at least a 20 dB reduction in noise compared to a ball mill. At the same time, vertical wear is also greatly reduced in the consumption of wear-resistant materials.
Zhou Qinghao, director of the Ministry of Science and Technology of the China Building Materials Federation, said in an interview with reporters that by 2010, China will have to achieve 70% of the new dry process, and about 100 to 200 new lines will be built. “This is a huge vertical mill. market".
In fact, vertical grinding is just one aspect of localization of cement equipment. At present, there is a gap of 20% between cement industry in China and foreign countries. Before the mines are ruled, the title of the cement industry in the new century is “national supportâ€. In the increasingly fierce competition in the cement market, he said that cement companies must seize the five-year opportunity of the “12th Five-Year Plan†to strengthen technological transformation and improve their competitiveness.
The competition of large enterprise groups is a prominent feature of the cement industry in recent years. In addition to competition in cement production capacity and market size, competition in the R&D and manufacturing capabilities of cement equipment is also crucial. Big Group understands this principle. With the trend of large-scale cement production lines, it seizes opportunities for the development of large-scale equipment and has occupied the strategic commanding heights of the future.
The HRM4800 cement raw material vertical mill developed by Hefei Cement Research and Design Institute under China National Building Materials Group has been successfully applied to the 5000 tons of Nissan production line of Zhejiang Hushan Group Co., Ltd., and all technical indicators have met and exceeded the design requirements. Machine performance has reached the international advanced level of similar products.