1 It is difficult to control the underground reactions during gasification, and the composition of synthesis gas fluctuates greatly.
2 is greatly influenced by coal seam and geology, and it is easy to cause mutual water leakage and ventilation between wells.
3 The gas composition after gasification is unstable, and the type and content of gasifying agent need to be improved.
4 the underground combustion and gasification are not well controlled, so the monitoring of underground gasification process should be strengthened.
5 in this technology, most of the research only focuses on chemical process, and seldom pays attention to the development trend of the industry.
Underground coal gasification, as the main research direction of clean energy technology and an environment-friendly green technology in line with the sustainable development strategy, has been concerned and supported by national leaders and famous scientists.
The underground coal gasification engineering research center of China University of Mining and Technology (Beijing Campus), with the support of the national high-tech research and development plan (863 Plan) project-"Research on the stability control technology of underground coal gasification", has built a comprehensive test-bed of underground coal gasification process with world advanced level, which can complete the model test research on the development law and technological parameters of underground coal gasification process under different coal types and different coal seam occurrence conditions.
In p>1987, he completed the field test of underground coal gasification in Mazhuang Coal Mine, a key project of Jiangsu Province during the Seventh Five-Year Plan, and won the third prize of Jiangsu Province for scientific and technological progress. In 1994, he completed the semi-industrial test of underground coal gasification in Xuzhou Xinhe No.2 well, a key scientific and technological project in the Eighth Five-Year Plan, and initiated a new process of "long passage, large section and two stages", which was awarded as a major scientific and technological achievement in the Eighth Five-Year Plan.
won three national patents, namely "underground coal gasification process with long tunnel and large section in mine", "two-stage underground coal gasification process" and "underground coal gasifier with air supply".
In p>1996, the key scientific and technological project of Hebei Province-"Industrial Experiment of Underground Coal Gasification in Tangshan Liu Zhuang Coal Mine" was completed. In September 2, the project of "Research and Application of Underground Coal Gasification Technology in Xinwen Suncun Coal Mine" was completed, and civil and internal combustion engine power generation was carried out, which won the first prize of scientific and technological progress in Shandong Province and the top ten scientific and technological achievements in coal industry.
In p>25, China University of Mining and Technology carried out the underground coal gasification test in Chongqing Zhongliangshan North Mine, which realized the joint gasification of underground multi-coal seams for the first time in a high gas mine, and the gas produced was used as the gas for local households and steam boilers. The success of this test is of great significance to the control of carbon emissions in the future coal mining process.
In January, 27, Xinao Group invested more than 2 million yuan to establish Wulanchabu Xinao Gasification Coal Mining Technology Co., Ltd., and together with China University of Mining and Technology, it carried out the research on "No-well underground coal gasification test project", which was strongly supported by Inner Mongolia Science and Technology Department and Wulanchabu Science and Technology Bureau. On October 24th of the same year, China's first underground coal gasification test system and production system with a daily output of 15,m3 gas were successfully ignited at one time. Up to now, the field test has been running for more than 4 days, and it has the ability of heating, generating electricity and producing chemical raw materials, and has achieved a number of innovative research results and applied for 9 patents.
From May to November, 21, Professor Wang Zuotang of China University of Mining and Technology cooperated with Huating Coal Industry Group Co., Ltd. to develop the "Industrial Test Project of Underground Gasification and Low-carbon Power Generation with Well-type Comprehensive Guidance and Control Method for Difficult Coal Mining". The project was appraised by the Science and Technology Department of Gansu Province in November of that year. The experts of the appraisal committee agreed that the innovation of the project was outstanding, and the guidance and control technology of high-efficiency steady-state spread of combustion in underground coal seam reached the international leading level, and they agreed to pass the appraisal of scientific and technological achievements. The main technical points of the project are to adopt a new type of narrow strip virtual bottom furnace and multi-furnace cooperative operation, ground guided gas injection and filling to reduce sedimentation and solid pollution, high-hydrogen gas power generation and other industrial technology clusters, which overcome the problems of low fuel value, weak stability, small scale and difficult measurement and control of conventional underground gasification. The calorific value of the produced gas is more than 9.MJ/Nm3, which can be used to produce coal-based natural gas and low-carbon gas for power generation, realizing the controllable combustion process, high-quality and stable gas production and safe production process. Based on the major technical problems in the development and utilization of difficult-to-mine resources in resource-exhausted mines due to complex geological conditions and mining technology restrictions, the project conducts research and industrial tests, which provides strong technical support for prolonging the service life of the mining area, improving the recovery rate of coal resources and promoting the sustainable development of coal enterprises, and provides practical basis for the gasification and mining of nearly 6 million tons of scattered coal resources left over from the large-scale physical mining process in Huating mining area. 1. At present, China's underground gasification technology is still in the industrial test stage, and there are many problems to be studied and explored. Therefore, the state and relevant departments should give strong support, formulate corresponding policies, provide certain measures and funds, and promote the research work in this area. And should organize and coordinate, do a good job in tackling key problems, in order to make underground gasification technology really used in production and application in a short time. ?
2. The purpose of underground coal gasification is application and industrialization. At present, in order to find a new way out of coal and strengthen the research on comprehensive utilization of coal, many enterprises are optimistic about underground coal gasification technology, but users should be confirmed before launching the project, otherwise the due effect will not be obtained.
3. Improving calorific value and producing gas components suitable for users are the keys of gasification technology. At present, the calorific value of air gas produced by underground gasification is low, so the application scope is limited. In order to improve the calorific value of gas and stabilize the gas composition, semi-water gas, water gas and oxygen-enriched gas were produced in the past experiments, but at present, these processes need further research in technical equipment.
4. Effective control of the combustion and operation of underground gasifier is the guarantee means for stable gas production and relatively stable gas components in underground coal gasification. At present, the control system is still relatively simple, so the research unit should further tackle key problems, establish an effective measurement and control system for the underground gasifier, and focus on the control technology of combustion position and combustion speed, among which reliable sensing components are very important. ?
5. The safety technology of underground gasifier and ground facilities is the guarantee for underground gasification. Adequate and necessary measures should be taken to prevent leakage. Explosion prevention and fire prevention should also be done well, and strict regulations should be formulated to ensure safe gas production. ?
6. To study the structural changes and ground subsidence of underground gasifier after combustion, dissect one or two gasifiers in time, and understand the conditions in the gasifier and the ground subsidence law after combustion, which will play a great role in improving the understanding of underground coal gasification technology, modifying the furnace design and improving the control of operation law.
7. Establish an experimental research base for underground coal gasification, select one or two representative coal types (bituminous coal, anthracite, etc.), coal seams (thickness, dip angle, etc.) and users (civil fuel, power generation, chemical raw materials) as the experimental bases, carry out a number of technical breakthroughs and research, and popularize and apply them on the basis of success. (China Coal Market Network was published on April 29th, 22)