Aerospace Maiwei Half-Waste Gasifier Operates Stably for 100 Days

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Spaceway’s Semi-Boiler Gasification Furnaces Have Operated Stably for 100 Days Author/Source: Sinochem News Network Date: June 6, 2023 Clicks: 12 As of June 5, the two 2,000-ton capacity semi-boiler gasification furnaces developed by Guizhou Spaceway Technology Co., Ltd. have been operating continuously and stably for 100 days as part of the hydrogen production improvement and ammonia by-product generation upgrade project at Zhejiang Balin Hengyi Caprolactam Co., Ltd. It is understood that this project utilizes the powder gasification technology based on the Aerospace Maiwei semi-waste boiler process, as an alternative to the atmospheric pressure fixed-bed batch gas generation process, in order to provide a stable supply of hydrogen to downstream applications; meanwhile, synthetic ammonia is produced as a by-product for use in the caprolactam production facilities. To improve efficiency and reduce costs, Baling Hengyi actively explores coal blending methods, optimizing the combination of different coal types to minimize expenses. The technical team at Aerospace Maiwei, in collaboration with the workshop staff, assessed the reaction conditions inside the gasification furnace by examining parameters such as the temperature of the gasification chamber, the pressure difference at the slag outlet, the shape of the coarse slag, and the methane content in the syngas. By making timely adjustments to the operating parameters, they ensured the stable operation of the gasification unit. It is reported that Aerospace Maiwei’s half-waste gasification technology transforms the traditional single \"gasification island\" into a new, green and efficient development model of \"gasification island + power island + environmental protection island\". Under various operating conditions, the radiant waste boiler steadily produces high-pressure steam at 9.8 MPa, with no sign of performance degradation; this solves the industry-related problem of ash and slag accumulation in the waste boiler section of gasifiers in such systems. The by-product steam generated by each gasifier in the Baling Hengyi project can generate approximately 80 million yuan in additional revenue for the enterprise each year. The MaWeiBan waste-heat gasification technology for the aerospace industry can also recover and utilize the high-grade thermal energy of high-temperature crude syngas. As a result, the temperature of the gas entering the quench chamber is significantly reduced, which leads to a reduction of the quenching water volume by about 50%. This in turn reduces the load on the slag-water system as well as the energy consumption of the facility. Since operations began on November 23, 2022, the actual carbon conversion rate at the Baling Hengyi project has exceeded 99%; the residual carbon content in the coarse slag is 1%–3%, while that in the fine ash is around 20%. Most of the ash contained in the syngas is separated out in the cyclone separator, which reduces the risk of clogging due to ash in the syngas and within the system. This improves the stability of the facility and enhances the conditions in the gasification workshop. According to Tang Yanchao, the director of the hydrogen and ammonia production unit at Baling Hengyi, calculations based on the actual operational data on site show that the comprehensive energy consumption per ton of ammonia produced in this project is about 7% lower compared to the quenching process, resulting in a cost reduction of around 200 yuan per ton of ammonia – indicating significant economic benefits.