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It is understood that coal-fired power projects have great water consumption, and 2 billion cubic meters per year of coal-based natural gas projects consume 25 million tons of water per year. The coal chemical project sewage treatment volume is also very large, such as Shenhua Ningdong coal chemical base olefin circulating water, water supply system installation and civil engineering projects, the maximum water treatment capacity of 4.33 million cubic meters / day, equivalent to the highest water use in urban areas in Beijing With 1.68 times of the volume of 2.575 million cubic meters/day, it is currently one of the world's largest industrial circulating water installations. To this end, the National Development and Reform Commission, the Ministry of Environmental Protection and other relevant departments jointly issued the "Notice on Strengthening the Construction and Management of Coal Chemical Industry Projects to Promote the Healthy Development of the Industry." It explicitly proposed to limit the application of high water consumption processes and equipment and encourage the adoption of water-saving technologies. We strongly advocate the development of technologies such as wastewater treatment and reuse of water.
Experts pointed out that coal chemical gasification technology is diverse, the project consumes large amounts of water, and the composition of wastewater is complex. With the advancement of energy conservation and emission reduction in China, a comprehensive database of water samples has been established around the gasification technology and major supporting technologies to develop efficient and economical technologies. The applicable sewage treatment technology and reuse technology are imperative.
According to Huang Huayao, director of the Xuzhou Institute of Water Treatment in Jiangsu, the selection of water treatment processes, the setting of system parameters, and the integration parameters of various processes and facilities determine the economics and operating efficiency of the entire water treatment system installation. For new water treatment devices, since there is no data on water samples, water treatment service providers need to perform several simulations and data tests to more accurately determine a more economical and reasonable design. Practice has proved that the rich and reliable reference experience data of the professional water sample database can enable water treatment service providers and design companies to more accurately place data during simulation and testing, reduce the number of tests, shorten simulation time, and reduce capital cost and labor cost. . At present, China has become the country with the largest number of coal gasification technologies in the world. The coal gasification technologies being applied include the GE gasification technology, multi-nozzle water coal gasification technology, ash fusion fluidized bed gasification technology, and U-GAS gas. As many as 10 kinds of chemical technology.
When the reporter interviewed the heads of some water treatment service companies, they all said that with such a variety of coal gasification technologies, it is very necessary to establish a database of water samples to form a coal chemical water treatment design code. However, at present, design institutes have weak technical strength in water treatment, and each design institute has its own design indicators, making it difficult to achieve optimal design.
Professor Jin Xibiao, professor of the Department of the Environment at East China University of Science and Technology, pointed out that coal chemical companies can do a lot to save water. Establishing a database of coal chemical water samples is not only conducive to the formation of design specifications and data references, but also conducive to the implementation of coal chemical companies in the whole plant water system. Integrate analysis to identify "bottleneck", formulate optimization plan and implement it. Huang Huayao said that due to the lack of data on water samples, the water treatment design process prior to the construction of coal chemical installations is a macroscopic plan, which is difficult to be accurate and detailed, and there is a large gap between it and the actual situation, resulting in large user investment and high operating costs. He believes that the establishment of a coal chemical water sample database is also conducive to the design of environmental assessment throughout the country.
Experts pointed out that the chemical composition of coal chemical industry is complex, and the use of multiple methods for joint treatment is the development direction of coal chemical wastewater treatment technology. Establishing a database of water samples for various coal gasification technologies and supporting major technologies will help to find out where wastewater is located. Contains various substances such as cyanide, oil, and ammonia nitrogen, and selects and combines applicable water treatment processes.
It is understood that the current domestic coal chemical industry has not attached great importance to water saving and emission reduction, and still regards the water treatment system as an auxiliary facility, and it is regarded as an “individual sector matterâ€. There are many technical exchanges in the industry for coal chemical products, but there is almost no exchange of experience in water treatment technologies and operations. All these have hindered the accumulated experience and further development of coal chemical water treatment technology. In this regard, people in the industry believe that all relevant units should abandon conservative attitudes and strengthen exchanges and cooperation, especially with the commissioning of large-scale coal chemical projects such as coal-to-oil, coal-to-olefins, and coal-to-natural gas projects, design institutes and coal chemical companies. Efforts should be made to explore water-saving and emission-reduction technologies, establish a database of specialized water samples as soon as possible, and develop applicable technologies to scientifically promote water-saving and emission-reduction of coal-based chemical industry so that they can no longer touch stones and cross rivers.
The investment in coal chemical projects is large, and the corresponding investment in water treatment projects is also very large. Moreover, most of the projects are managed and managed, and the single contract amount is tens of millions of yuan, and even over 100 million yuan. However, such a major project construction did not cause the industry enough attention. In view of the huge amount of water treatment in China's coal chemical industry, the current status of a complete database of water samples has not been established. Experts recently proposed to establish a database of coal chemical water samples to develop efficient, economical, and applicable sewage treatment technologies. With technology, it is of strategic significance to achieve energy-saving and emission reduction in the coal chemical industry.