China's coal chemical cost is expected to be greatly reduced
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The former director of the National Water Coal Slurry Engineering Center, the professor-level senior engineer James Long, the director of the China University of Mining and Technology, Wu Guoguang, and the researcher of the Shanxi Coal Chemistry Institute of the Chinese Academy of Sciences, Li Baoqing, and other experts agreed that the low-level development of the Yulin Western Coal Technology Research Center. The technology of producing high-concentration coal water slurry and complete set of production lines for coal fine dry powders has broken through the technical bottleneck of low-cost coal preparation of high-concentration coal water slurry and reached the international advanced level. Experts recommend that the application be promoted as soon as possible on the basis of further improvement of relevant safety technology measures.
Experts pointed out that this achievement will play a positive role in promoting the development of a new type of clean coal chemical industry led by pressurized coal gasification technology. In particular, the adoption of this technology to increase the concentration of coal water slurry will significantly reduce the cost of coal chemical companies. Taking the 600,000-ton/year coal-to-methanol plant as an example, after adopting a new technology to increase the concentration of coal water slurry from 62% to 72%, it can increase production of methanol by 50,000 tons per year, reduce oxygen consumption by 84 million cubic meters, and reduce coal consumption. The consumption (including power and electricity equivalent coal) is 21,000 tons, and the cost-effectiveness is more than 13 million yuan. The economic, energy-saving and environmental protection benefits are very significant.
Low-rank coal is the coal with the shortest coal-forming time and the lowest degree of coalification. Because it is difficult to obtain high-concentration coal-water slurry, it has limited its application in chemical production. Prior to this, the highest concentrations of low-rank coals used as raw materials to obtain coal-water slurry at home and abroad could only reach 59%. Preparation of high-concentration coal-water slurry with more than 65% and good rheology has been a worldwide problem. He Feng, chief engineer of Yulin West Coal Technology Research Center, led his team and began research on the issue of low-rank coal to produce high-concentration coal-water slurry.
The center successively spent 40 million yuan to purchase test equipment and analysis and inspection facilities. Five kinds of low-rank coals containing 25% to 43% of internal water, including lignite, were used as raw materials. After 56,000 iterations, the test equipment was tested. After several optimization reforms, it finally developed low-rank coal fine dry powder to produce high-concentration coal water slurry technology and a complete set of process production line to produce a concentration of 67.8% to 72.0%, a viscosity of 590 to 900 mPas, and good stability. Coal slurry. In addition, the center also used the most difficult-to-grind material, Bozixile brown coal, as a raw material to produce a coal-water slurry with a concentration of more than 65% and a viscosity of less than 1200 millipascal-seconds. This made it difficult to attack low-grade coal in one fell swoop. Preparation of high concentration of coal slurry in the world of problems.