With the increasing production of various types of waste, the drawbacks of traditional landfill disposal methods have become apparent and are gradually being replaced by waste incineration power generation methods. At the same time, given the advantages of high-temperature calcination of cement kilns, the use of its co-processing of various types of waste has gradually become another new type of waste incineration. In recent years, cement kiln co-disposal waste has become popular, and it has occupied a place in the treatment of urban solid waste and hazardous waste.
Cement Kiln Cooperative Disposal of Solid Waste Technology and Experience at Home and Abroad
Cement Kiln Cooperative Treatment Technology
The cement kiln co-processing is a new waste disposal method put forward by the cement industry. It refers to the solid waste that meets or requires pre-treatment to meet the requirements of the kiln input to the cement kiln, and realizes the solid at the same time as the cement clinker production. The harmless disposal process of waste.
Cement kiln co-processing solid waste prominent advantages. First, the use of existing industrial facilities does not increase land, the environment is small, and the construction investment is relatively small. The second cement kiln has a high-temperature calcination and a strong alkaline atmosphere, which can effectively suppress the generation of secondary pollutants such as di-VA and HL. As long as it is properly controlled, there will be no hidden danger of secondary pollution. Third, it can not only achieve the reduction and recycling of solid waste, but also promote the development of the cement industry to the green industry. Therefore, local cement kiln co-processing projects frequently landed. At the National Cement Kiln Cooperative Disposal Innovation and Development Conference held in December 2017, it was learned that about 80 cement kiln co-disposal lines have been built across the country, and the nationwide use of cement kilns for co-processing of domestic waste has reached 5 million tons per year, and municipal sludge has been disposed of. The capacity is nearly 2 million tons per year, and the hazardous waste approval capacity exceeds 1.5 million tons per year.
Of course, the co-processing of cement kiln is not "impeccable", and there are some problems that need to be solved urgently. For example, China's cement kiln co-processing technology gap. Gao Changming, senior advisor of China Cement Network, recently stated that the mainstream of foreign developed countries are using the heating value as the cement kiln co-processing to determine the replacement rate, the average replacement rate in developed countries is 23%, and Germany is even close to 70%, even with the world average. Compared with 4%, the gap in China is still significant.
Cement kilns co-processing national policy
In recent years, the country has been encouraging the development of cement kiln co-processing technologies.
In January 2013, the State Council issued the "Recycling Economy Development Strategy and Immediate Action Plan," which explicitly proposed to encourage cement kilns to co-resource and process solid waste;
In December 2013, the Ministry of Environmental Protection issued the "Technical Code for the Environmental Protection of Solid Wastes from Co-processing Solid Wastes in Cement Kilns" and "Control Standards for the Co-processing of Solid Waste in Cement Kilns", which was implemented on March 1, 2014.
In 2014, seven ministries and commissions, including the National Development and Reform Commission and the Ministry of Industry and Information Technology, jointly issued the "Opinions on Promoting the Cooperative Resource Utilization of Urban and Industrial Wastes in the Production Process", and included cement kiln co-processing in key support areas.
In February 2016, the Ministry of Environmental Protection began to solicit comments on the “Technical Policy for the Prevention and Control of Solid Waste Pollution from Co-processing of Cement Kilnsâ€, and it was launched on December 8, the same year.
In October 2016, in the "Building Materials Industry Development Plan (2016-2020)" released by the Ministry of Industry and Information Technology, it explicitly proposed to support the use of the existing new dry process cement kilns for the cooperative disposal of domestic garbage, municipal sludge, polluted soil and hazardous wastes. Include it in key promotion projects;
On May 31, 2017, the Guidelines for the Examination of Operation Licenses for Handling Synergistic Hazardous Wastes from Cement Kilns (Trial) was also officially released.
The National Conference on Industry and Information Technology held in 2018 pointed out that cement kiln should be promoted to co-dispose of urban garbage and industrial waste, and efforts should be made to upgrade the level of green development.
In addition, the Ministry of Housing and Urban-Rural Development will use the use of cement kilns to co-dispose of household waste into the “13th Five-Year Plan†of municipal infrastructure construction, and require pilot demonstrations such as cement kiln co-processing in areas where conditions are available.
Cement kiln co-processing company
With national policies encouraging cement kiln co-disposal of solid waste and hazardous waste, coupled with the increasingly mature technology of cement kiln co-processing, traditional cement manufacturing companies such as Conch, Huaxin, and Jinyu have been involved in the disposal of solid wastes and use cement kiln to co-process life. Rubbish. At the same time, environmental protection companies have also joined hands with cement companies to achieve strong alliances and jointly promote cement kiln co-processing industries. On January 23, 2018, Oriental Garden signed a strategic cooperation agreement with Titanium International. The two parties will jointly implement a strong alliance in the field of hazardous waste co-processing in cement kiln and jointly promote the rapid development of hazardous waste treatment industry.
In 2007, Conch Group and Japan’s Kawasaki Corporation developed a new dry-process cement kiln to treat municipal solid waste. Subsequently, it established the world’s first demonstration project for the treatment of household garbage using gasification technology in Anhui Province. After testing the exhaust gas standards, the company built a cement kiln to cope with the garbage project and put it into production. In 2015, Conch Cement also introduced cement kiln co-processing of municipal solid waste into Laos. In December 2017, Conch Cement signed a "strategic cooperation agreement" with hazardous waste faucets, and reached a strategic cooperation intention on the joint disposal of solid waste in cement kiln, and jointly promoted the healthy development of hazardous waste treatment industry.
On November 14, 2017, the cement company Jinyuan Stock Co., Ltd. released an environmental protection industry plan, focusing on key areas such as co-processing of cement kilns. In November 2017, the company acquired 40% of the equity interest in the acquisition of Zhongsi Runyi Environmental Protection and 51% of Sichuan Tianyuanda Environmental Protection. In January 2018, it acquired a 51% stake in Chongqing Haoyuan Environmental Protection Technology Co., Ltd., both of which promote the company's co-processing in the cement kiln. Waste direction development.
According to statistics from China Cement Network, as of October 26, 2017, there were 37 cement companies with cement kiln co-disposal hazardous waste business licenses, accounting for less than 2% of the total number of companies with hazardous waste treatment qualifications in China (over 1,720). The proportion is very low, but the total number and approved disposal scale have been doubled in the past three years, and the approved disposal scale is nearly 2.5 million tons.
Foreign cement kiln co-disposal
In foreign countries, co-processing of cement kilns is one of the major means for the disposal of solid wastes and hazardous wastes. It has been more than 40 years of development history.
In Germany, cement kiln co-disposal and waste-to-energy have been used in the burning of garbage. And the cement industry is burning
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