【正文】 ngqing Environmental Protection Bureau. With an investment of million yuan, it consumes 36,000 tons of sludge from the local sewage treatment plant every year, while the cement production of Nanshan Plant in 2022 has exceeded 2 million tons. In the past sewage sludge has traditionally been buried in a local sewage treatment plant39。s landfill, but under the new project the sludge is taken from the sewage plant and processed into a raw material to produce cement. The sewage treatment plant pays Nanshan Cement Plant 100 yuan for every ton of thesludge it takes away. The cost of cement production is reduced and pollution caused by landfill disposal is also reduced. Using sludge makes the cement no different than before, a technician of Nanshan Cement Plant says in front of a rumbling cement kiln. The sludge to cement process was first developed at Lafarge cement plants in France in the late 1990s and it39。s also currently being used in Japan and South Korea. Lafarge is willing to bring our technology and experiences into China,says BrunoLafont, the Chairman and CEO of Lafarge Group. However, such an undertaking is rarely seen in Chinese cement plants nowadays, says Deputy Secretary General of China Cement Association, Zhang Jianxin. Lafarge39。s innovation has set a good example of a circular economy system in China. Along with the sludge usage project, a waste heat recovery (WHR) project has also begun at the Nanshan Cement Plant. The 82 million yuan project can meet 30 percent of the total electricity consumption of the Nanshan plant. It is predicted that the investment will be paid off within three years. 石家莊鐵道大學(xué)畢業(yè)論文 23 The market price of electricity is yuan per kWh, but our cost to produce a kWh of electricity is merely yuan, he heat accounts for 30 percent of all the heat consumed during a significant portion of the cement making process. The WHR project will annually save 45 million kWh by recovering the waste heat from the cement kilns into power through a steam turbine, reducing carbon dioxide emissions by 70,000 tons. In addition to the Nanshan project, Lafarge Shui On has invested in five WHR projects in Sichuan and Yunnan. WHR technology is also being used in other Chinese cement Conch Cement Co Ltd is the largest Chinese cement enterprise. By the end of 2022, the installed capacity of its WHR projects reached 168,900 kWh, accounting for 31 percent of the overall capacity of the entire Chinese cement industry. Anhui Conch plans to put another 19 WHR projects into operation during 2022, producing 9 billion kWh of electricity every year. In other words, million tons of standard coal and 1 billion yuan in costs can be saved annually. Anhui Conch Cement Co Ltd is the earliest domestic cement waste heat generation, responder a resourceconserving, environmentfriendly industrial enterprises, promoting energy conservation and emission reduction, March 1998, China39。s first set of waste heat generator in conch gone into production. Through nearly 10 years of digestion, absorption and integrated innovation, conch developed with independent intellectual property rights, the international leading level of prehensive utilization of waste heat power generation technology of cement. A 5000 tons every available waste heat power line 2124 million degrees, tons of clinker generating capacity can reach 40 degrees, which can solve the 60% of clinker selfused electricity, product prehensive energy consumption can reduce 18%. Henan province is now requiring that new suspension preheater (NSP) cement production lines with a daily production capacity of 5,000 tons and above must be equipped with WHR facilities. The National Development and Reform Commission (NDRC) hopes that 40 percent of the NSP cement production lines in China will use WHR equipment by 2010. At that time, the annual electricity produced by WHR projects will reach billion kWh. 石家莊鐵道大學(xué)畢業(yè)論文 24 Since 1985 China39。s cement production was the highest in the world for 21 consecutive years, accounting for 48 percent of the global annual output. Statistics from the NDRC show cement production in China during the past eight months reached 887 million tons. From the present market situation, the cement industry will continue rapid development momentum, based on sustainable development as the goal, the prehensive utilization of energy consumption, the development strategy based on the cement production will be more and more important. Countries in the industry, fifteen planning early in production equipment trend forward to largescale, production process automation and intelligent development, pay attention to the scale benefits and saving energy and reducing consumption, cement production development of bigness trend is very clear. Meanwhile, automation technology research and development and application of innovation can in turn promote process improvement. In the future for a period of time, how to improve the cement production equipment production efficiency, reduce the energy consumption and reduce environmental burden will is the development direction of cement production. The cement industry also consumes 15 percent of all the coal burned in China. Currently, China39。s carbon dioxide emission rate ranks second in the world. According to the 11th FiveYear Plan for the Chinese cement industry from 2022 to 2022, the energy consumption of each ton of cement should be reduced by 25 percent pared with the previous five years. Do the thorough elimination of backward cement works,and to promote the development of new dry process cement production development of new dry process cement technology can save a lot of resources and energy, reduce CO2 emissions。The dedusting technology, flue gas desulphurization technology and screen technology, basically solve the dust, SO