[Ten years of development of chemical equipment] 1659-2020 The first domestic high-alkali coal circulating fluidized bed coal gasification unit was successfully put into operation
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2 0 2 4 Happy May Day, safety first. Thumbs up for the achievements of China's chemical technology and equipment. * * * * * * * * * * * * * * * * * * * * * * [Ten years of development of chemical equipment] Continue to update summary posts, welcome to participate in the discussion https://bbs.hcbbs.com/thread-3576046-1-1.html (Source: Haichuan Chemical Forum Network) * * * * * * * * * * * * * * * * * On September 18, 2020, the trial production of urea products of the 40·60 project of Xinjiang Yihua Chemical Co., Ltd. successfully rolled off the production line, marking the successful commissioning of the Xinjiang Yihua coal gasification equipment project undertaken by Zhongke Hefei Coal Gasification Technology Co., Ltd. (Zhonghe Gasification). This project is an upgrade project for the gas production section of Xinjiang Yihua's ammonia synthesis system. It uses three sets of atmospheric circulating fluidized bed oxygen-enriched gasifiers with a single capacity of 60,000 Nm³/h to replace the original 20 atmospheric fixed bed oxygen-enriched continuous gasifiers to produce syngas. It is currently the largest circulating fluidized bed coal gasification device used in the synthetic ammonia industry in China, and is also the first domestic circulating fluidized bed gasification system that uses high-alkali coal as raw material to produce syngas. Xinjiang Yihua Chemical Co., Ltd. is a wholly-owned subsidiary of Yihua Group registered in Jimsar County, Changji Hui Autonomous Prefecture, Xinjiang in order to implement the strategy of converting Xinjiang's advantageous resources and promote local economic development. It is also the first large-scale enterprise to enter the Zhundong region of Xinjiang, with a production scale of 400,000 tons of synthetic ammonia and 600,000 tons of urea. Previously, the gas-making section of Xinjiang Yihua used non-local smokeless lump coal as raw material to prepare syngas through 20 atmospheric fixed-bed oxygen-enriched continuous gasifiers. It had shortcomings such as high raw coal cost, low single furnace load, difficult tar treatment, and high emissions of three wastes. It was not in compliance with the requirements. * * Environmental requirements. The Zhundong region is rich in coal resources, but most of them are high-alkali coals, which have characteristics such as strong contamination, easy coking, large fluctuations in ash melting point, and poor slurry-forming properties. Gasification processes such as fixed-bed slag, entrained-bed coal-water slurry, and entrained-bed pulverized coal cannot be used.
In line with the principle of making full use of local coal resources, combined with the characteristics of Zhundong high-alkali coal, and after feasibility study, the R&D personnel of Zhonghe Gasification designed and used circulating fluidized bed oxygen-enriched coal gasification technology (CGAS technology) to build 3 sets of single-unit production capacity of 60,000 The Nm³/h pulverized coal gasifier does not produce hazardous wastes such as tar and phenol cyanide wastewater during the gasification process. At the same time, it reduces material coking and heat loss through customized designs such as optimizing the gasification agent air inlet method, constructing a high-throughput return cycle, and strengthening waste heat recovery. The successful operation of this project will * * To reduce the gas production cost of Xinjiang Yihua, the cost of ammonia per ton can be reduced by 200 to 400 yuan, and the high-temperature steam produced by the by-product can provide heat source for the factory production line. Since entering the project after the year, the project team has actively overcome many difficulties such as the complex climate, time difference constraints, and epidemic prevention and control in Xinjiang, and successfully completed high and low temperature ovens, three inspections and four determinations, PSSR review, stand-alone test run, linkage test run, no-load test run, etc. On September 6, the gasification device was successfully ignited, officially sounding the clarion call for commissioning; on September 8, the synthesis gas index was qualified (effective gas ≥ 64%), meeting the subsequent synthetic ammonia production requirements; on September 16, the synthetic ammonia system produced qualified liquid ammonia; on September 18, the urea product was rolled off the production line. During the trial production of the gasification device, the overall operation was stable, the furnace temperature was uniform (axial temperature difference ≤ 10°C), and the load adjustment was flexible. The gasification unit, waste heat recovery unit, dust removal unit, cooling water unit, slag discharge unit, coal conveying unit, ammonia evaporation unit, etc. all meet or even exceed the design indicators. During operation, the operating load is ≥95%, the cold gas efficiency is ≥76%, the gasification agent preheating temperature is ≥700°C, and the by-products are 3.8MPa and 400°C medium-pressure steam ≥60 tons/h.
“This device is the most advanced new coal gasification process in the country's industry adapted to the coal quality of Zhundong Development Zone. At the same time, to produce ammonia and urea, coal gas production is the first step and the leader of the entire process. ”Yang Xiaoqin, member of the Xinjiang Yihua Party Committee and chief engineer, said that he said that this set of equipment has solved the special problems of Zhundong sub-bituminous coal such as high sodium and potassium, high moisture, low ash content, low ash melting point, oil content, special viscosity-temperature characteristics, and poor slurry-forming properties through ingenious processing, making it the most suitable choice for large-scale new coal gasification using Zhundong sub-bituminous coal as raw material. The smooth operation of the Yihua project fully demonstrates the strong adaptability of CGAS technology to different types of coal, provides a practical process path for small and medium-sized ammonia synthesis companies to reduce coal costs, and also provides technical and equipment support for the efficient and clean utilization of high-alkali coal with huge reserves in Xinjiang. This project is the second project successfully put into operation by China Gas in the field of synthetic ammonia. Among similar projects, the advantages of CGAS technology such as low operating costs, low construction investment, good environmental benefits, and short transformation cycles have become increasingly apparent.
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