[Ten years of development of chemical equipment] 693-2019 The first domestic circulating fluidized bed gasification system using high-alkali coal as raw material to produce synthesis gas
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Look at the ten years of great development of chemical equipment and praise the prosperity of China in the prosperous age. Replies will be rewarded and discussed. ----------------------------------------------- At 18:06 on September 18, 2019, Xinjiang Yihua Chemical Co., Ltd. (hereinafter referred to as "Xinjiang Yihua") 4060 project trial production urea product successfully rolled off the production line, marking the successful operation of the Xinjiang Yihua coal gasification equipment project undertaken by Zhongke Hefei Coal Gasification Technology Co., Ltd. (hereinafter referred to as "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. 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. 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 ammonia synthesis system produced qualified liquid ammonia ； Urea products were rolled off the production line on September 18. During the trial production of the gasification unit, 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.
Xinjiang Yihua invested nearly 3.8 billion yuan and began technological upgrading of on-site devices in May 2018. The project is divided into three phases. The first and second phases include 600,000 tons of calcium carbide, 250,000 tons of caustic soda, 300,000 tons of polyvinyl chloride and supporting thermoelectricity, and calcium carbide slag cement production, both of which were put into production in 2018. The third phase of the technical transformation and upgrading project was launched on October 28, 2018. It is mainly divided into three modules: 400,000 tons of synthetic ammonia, 600,000 tons of urea, 80,000 tons of melamine, and the entire plant's public auxiliary engineering. The newly added hydrolysis system and high-tower granulation exhaust gas efficient purification system in this upgrade improve the raw material conversion rate and achieve zero emissions by recovering a large amount of urea particles. After fully resuming production, the company is expected to increase sales revenue by 1.3 billion yuan, increase profits by 210 million yuan, increase tax revenue by 100 million yuan, and achieve "six improvements" in safety, environmental protection, fire protection, technology, equipment and facilities, and automation.
In September 2022, the "Normal Pressure Oxygen-Rich Circulating Fluidized Bed High-Alkali Coal Gasification to Syngas Technology" jointly completed by the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, Xinjiang Yihua Chemical Co., Ltd., and Zhongke Hefei Coal Gasification Technology Co., Ltd. passed the scientific and technological achievement appraisal organized by the China Petroleum and Chemical Industry Federation in Beijing. The appraisal committee unanimously agreed: This technology has generally reached the international advanced level, and has reached the international leading level in high-alkali coal gasification. It has positive significance for the development of high-alkali coal in Xinjiang and the development of the local economy.
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. In the future, China Gas & Chemical will continue to expand the application of CGAS technology in this field, lead the industry's technological innovation, and provide efficient, environmentally friendly and economical solutions for ammonia and coal chemical enterprises.
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