Manufacturers of oxygen-enriched oxidation and the problems associated with it

According to the China Chemical Industry News, a major breakthrough has been achieved in China’s proprietary technology for oxygen-enriched continuous gasification of pulverized coal. On December 5, reporters learned from Jiangxi Changyu Industrial Co., Ltd. that after more than 10 months of intensive efforts, the technical upgrade project aimed at optimizing the oxygen-enriched gasification process using fixed-bed coal briquets, carried out jointly by this company and Fujian Sanming Chemical Co., Ltd., was a complete success. The 5 newly installed 3.0m fixed-bed batch gasifiers have all been put into operation at Sanming Chemical, with all performance indicators exceeding those of the current standards in China’s fertilizer industry. The gas production volume and carbon conversion rate have increased by half, while the overall cost has decreased by 10%. Additionally, these gasifiers have completely solved the environmental problems related to sulfur compounds and carbon dioxide emissions associated with batch gasifiers. Zhao Lequn, an expert in gas generation technology and the chief engineer of Jiangxi Changyu Industrial Co., Ltd., told reporters that the cooperation between Sanming Chemical and Jiangxi Changyu in the renovation of gas furnaces began in June 2006. They first achieved high-intensity gasification using briquettes as raw material in 3.0m series fixed-bed gas furnaces; on this basis, they spent over 10 months working on the technology for continuous oxygen-enriched gasification of briquettes, and ultimately succeeded. The newly installed oxygen-enriched gas furnace at Sanming Chemical has increased gas production by 50% when burning briquettes in a single furnace. The overall cost per ton of ammonia has decreased by about 10% compared to the batch gasification process, while coal consumption per unit of output has dropped by around 30%. The fixed carbon content in the slag has fallen from 20% in batch gasifiers to less than 5%. According to You Biao, the chief engineer of Sanming Chemical Co., Ltd., the technology of oxygen-enriched continuous gasification for coal dust formation is a systematic project that requires addressing issues such as the thermal stability, thermal strength, chemical reactivity, and slag properties of briquetted coal. It also involves dealing with the scale of oxygen enrichment and the associated product costs, as well as the design of key equipment for gasifiers and the overall engineering design. Transforming the fixed-bed batch gasifier into a new oxygen-enriched continuous gasification process using briquettes as raw material resolves all these problems. At present, there are over 5,000 fixed-bed batch gasification coal gasifiers in China’s nitrogen fertilizer industry. These units not only suffer from low carbon conversion rates and high energy consumption, but also emit large amounts of sulfides and carbon dioxide. Replacing them with advanced foreign powder coal gasification technologies requires significant investment and a long period for technology transfer. The coal briquette oxygen-enriched oxidation technology upgrade project carried out jointly by Fujian Sanming Chemical and Jiangxi Changyu Company has established a practical path for technology upgrades for similar nitrogen fertilizer manufacturers and gas furnaces across the country.

Fujian Sanming Chemicals, Jiangxi Changyu Company – are there any other companies that use it? I also want to know its disadvantages. High temperatures can cause damage to the furnace bottom and pipes, as well as slag formation on the furnace walls, among other issues. I’m a newcomer with no knowledge in this area; I hope I can get some answers. Points for replies!!

The Xinjiang Fertilizer Plant has been using oxygen enrichment for many years; the first stage employs autothermal conversion, while the second stage uses oxygen-enriched conversion. The furnace walls are equipped with water jackets, and there is a unique burner design. The raw material is natural gas, and the energy consumption is very low, at around 750 m3 per ton of ammonia. The technology is mature, with an annual production capacity of 300,000 tons of urea.

The oxygen-enriched oxidation process represents progress as long as its costs are reduced and it is environmentally friendly