The domestic experimental platform of low-temperature coal spontaneous combustion was first established, which solved the worldwide problem of measuring the ignition period of coal spontaneous combustion.
In the late 1980s, Comrade Xu took the lead in establishing a domestic experimental platform for low-temperature coal spontaneous combustion. The experimental platform adopts the method of environmental similarity simulation, and relies on the oxidation and heat release of coal itself to make coal heat up and eventually lead to spontaneous combustion, which solves the worldwide problem of measuring the spontaneous combustion period of coal seam for the first time. Based on the experimental platform and computer simulation, combined with field tests, a method for measuring the spontaneous combustion period of coal seams in mines is established, and the calculation methods of characteristic parameters of coal spontaneous combustion at low temperature and limit parameters that can cause coal spontaneous combustion under experimental conditions, as well as the calculation methods of influence functions such as coal particle size, porosity and oxygen diffusion coefficient, are put forward, which lays an experimental foundation for the establishment of theoretical system of mine internal fire and mine fire prediction technology. The experimental platform has been used to test and predict spontaneous combustion period of more than 70 coal seams in China, and all the results have been adopted. Under the guidance of Professor Xu, the key technology of this experiment has been applied in major coal scientific research units, universities and large coal mining enterprises in China, and several experimental platforms have been established.
The theoretical system of mine internal fire is established.
The theory of coal spontaneous combustion prediction and determination of coal spontaneous combustion danger zone is established, and the theoretical system of mine internal fire is established.
Professor Xu first put forward the multi-stage reaction model of coal-oxygen complex and the thermal effect of each stage reaction, established the correlation between micro-reaction of coal spontaneous combustion and macro-heat release intensity, solved the quantitative calculation method of oxidation heat release of coal spontaneous combustion at low temperature, and established the mechanical and mathematical model of coal spontaneous combustion. The theory of judging the dangerous area of coal spontaneous combustion is established, and the calculation method of the limit parameters of coal spontaneous combustion in mine field is put forward, which solves the possible ignition area, ignition conditions and fire prediction problems in the process of coal mining in mine field, solves the theoretical division basis and calculation method of "three zones" of coal spontaneous combustion in mine field, and determines the fire source range after ignition. His works "Theory of Determining Dangerous Areas of Coal Spontaneous Combustion", "Theory and Technology of Predicting Coal Spontaneous Combustion" and related works integrate the theory and technology of coal spontaneous combustion mechanism, coal seam fire prediction and dangerous area determination, forming a theoretical system of mine internal fire. Editor-in-chief of the large-scale reference book "Guide to Coal Mine Safety Production Equipment" compiled by the State Administration of Coal Mine Safety, editor-in-chief of 9 books including "Early Prediction and Prediction Technology of Coal Spontaneous Combustion" and "Theory and Prevention Technology of Coal Spontaneous Combustion", and presided over major scientific research projects such as the National Outstanding Youth Fund, the National Natural Science Fund, the National Ninth Five-Year Plan Scientific Research and key projects of the Ministry of Coal, which laid a theoretical foundation for mine fire prevention and control in China.
The "colloid" fire prevention and extinguishing theory of coal seam fire is established.
The "colloid" fire prevention and extinguishing theory of coal seam fire was established, and a series of colloid materials, equipment and technologies were developed, which promoted the development of coal seam spontaneous combustion fire prevention and control technology in the world.
Based on the research on the mechanism of coal spontaneous combustion, Professor Xu put forward the "colloid" fire prevention theory suitable for coal seam fire prevention and extinguishing for the first time, wrote the monograph "Theory and Technology of Colloid Fire Prevention and Extinguishing in Coal Seam Spontaneous Combustion", developed a series of colloid fire prevention and extinguishing materials such as inorganic colloid, polymer colloid and composite colloid, developed underground mobile and ground pipe network large-flow glue injection technology, developed corresponding supporting equipment systems and obtained four patents. For the first time, the technical problems of fire prevention and extinguishing in large fire areas of mines, especially high-gas mines and high-yield and high-efficiency mines, have been overcome. This achievement has become the main mine fire prevention and extinguishing technology, which has been popularized and applied in the whole country 18 provinces (cities) and autonomous regions, and has been included in the "Coal Mine Safety Regulations" to realize industrialization.
Created a precedent for fire prevention and extinguishing in mine fire areas.
He has been engaged in scientific research on mine fire prevention and rescue for a long time, which has created a precedent for mine fire prevention and rescue. In the early 1990s, coal seam fire became one of the most important factors restricting the development of high-yield and high-efficiency mining technology in coal mines. According to the characteristics of coal seam fire in China, Professor Xu led the research group to the mine fire site, went deep into the front line of underground disaster area, found out the key problems of mine fire, and developed the technology of judging the spontaneous combustion dangerous area in goaf of fully mechanized top-coal caving face, the technology of judging the spontaneous combustion dangerous area in roadway, the technology of predicting the spontaneous combustion period of coal, and the technology of colloid fire prevention and extinguishing. In the process of popularizing this technology on site, according to different fire types in coal mines, key technologies of fire fighting and emergency evacuation equipment in large-scale fire areas such as coal mining face, cut-off, stop-mining line, roadway and adjacent goaf have been developed, which has created a precedent for fire fighting in large-scale high-temperature fire areas in mines, especially in high-gas mines.
Bigger and stronger safety science and technology industry incubation base
Strengthening the transformation of scientific and technological achievements with independent intellectual property rights into real productive forces and making the safety science and technology industry incubator bigger and stronger have provided new support for overcoming theoretical and technical problems of safety engineering.
In 2000, with the support of Xi 'an Science and Technology Commission and Xi 'an University of Science and Technology, Xikesenlan Trade Co., Ltd. was established, mainly engaged in the production and related research and development of colloidal materials and complete sets of mine fire prevention and extinguishing equipment, with an output value of/kloc-0.5 million yuan in 2003. The company's assets reached100000 yuan, which initially realized three major changes in coal mine safety prevention and relief from small equipment to large system equipment, from manual control to intelligent control, and from local prevention to overall mine prevention. The company spends 7- 10% of its business on scientific research every year. At the beginning of 2004, he persuaded the board of directors of Lan Sen Company to spend more than RMB1100,000, plus more than RMB 3,000,000 in vertical and horizontal funds, and invested more than RMB 4,000,000 in safety high-tech research. Lead the research group to make new breakthroughs in the research of visual command system for mine disaster relief, the construction technology of long-distance rapid explosion-proof wall for mine disaster relief, and the research of mine fire prevention and extinguishing chemicals and materials. 1992, its research project "Study on low-temperature spontaneous combustion process of coal" won the third prize of scientific and technological progress of the Ministry of Energy; 1994 won the third prize of the field project "comprehensive fire prevention and extinguishing technology for large dip angle and extra-thick coal seam"; 1996 was rated as "Top-notch Professional Talents" by the Ministry of Coal and "555 Cross-century Talents" by Shaanxi Province; 1997, his field application project "application of high-temperature hydrocolloid direct fire extinguishing technology in Gansu" won the third prize of provincial scientific and technological progress; In the same year, he was approved to enjoy the special government allowance issued by the State Council; 1998, the ministerial project "High-temperature hydrocolloid fire extinguishing technology" which he presided over won the second prize of scientific and technological progress of the Ministry of Coal, and was included in the promotion plan of major scientific and technological achievements of the Ministry of Coal 100. From 65438 to 0999, the project "gel fire prevention and extinguishing technology in fully mechanized top-coal caving face" he presided over won the first prize of Xi scientific and technological progress in 2000 and the first prize of Shaanxi scientific and technological progress. In the same year, this achievement was included in the major scientific and technological achievements transformation project plan of Xi. In 2002, "Determination of spontaneous combustion danger area and research on colloid fire prevention and extinguishing technology in fully mechanized top-coal caving face" won the second prize of national scientific and technological progress. In 2003, he presided over the "Study on Colloidal Fire Prevention and Extinguishing Technology in Fully Mechanized Caving Face of High Gas Flammable Coal Seam" and won the Shanxi Science and Technology Progress Award.