SE water-cooled wall gasification technology for water coal slurry: effective for treating high-salt organic waste liquids

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To date, the gasification unit of Hunan Petrochemical’s project for the relocation, upgrading, and transformation of the production chain capable of producing 600,000 tons of caprolactam per year has processed over 1 million tons of caprolactam waste liquid, thereby saving an equivalent amount of fresh water. The facility utilizes Sinopec’s proprietary 1,500-ton-class SE coal-water slurry water-cooled wall gasification technology to convert high-salinity organic waste liquid into syngas feedstock, thereby achieving both the resource utilization of waste liquid and the benefits of water conservation and emission reduction. 　　The gasification unit was supplied with technical licensing by Sinopec Ningbo Engineering Co., Ltd., which was also responsible for preparing the process package and carrying out the engineering design. Since it came online in November 2023, it has been operating stably for over two years, providing a stable and reliable supply of syngas to the downstream facilities. This technology offers advantages such as a long burner life, high conversion efficiency, and broad adaptability to different coal qualities. Its core component – the ablation-resistant multi-feed-channel gasification burner – enables an extension of the operating cycle by 50% thanks to the cooling effect of the slurry in the outermost channels, thereby overcoming the bottleneck posed by burner lifespan limitations on the long-term operation of gasification furnaces. Furthermore, the use of long-life water-cooled walls in place of traditional refractory bricks, combined with an integrated burner design for \"ignition – heating – feeding\", significantly reduces the startup time. The continuous operation cycle of the gasification furnace is doubled, thereby improving the reliability and economic efficiency of the plant’s operation. 　　The high-concentration saline organic wastewater generated during the production of caprolactam is characterized by high acidity and complex composition; traditional concentration and incineration methods are costly and prone to causing secondary pollution. This gasification unit enables the production of caprolactam from 100% waste liquid, allowing 1,400 tons of high-concentration saline organic waste liquid to be reused daily in place of fresh water. Practical tests have shown that this technology achieves a COD removal rate of 98.8%, without introducing any additional pollutants, thus enabling near-zero discharge of wastewater and efficient resource utilization. 　　It is also stated that this gasification technology can be applied to the treatment of high-concentration saline organic waste streams generated in industries such as catalysts, epoxy resins, paints and coatings, and pharmaceuticals, providing a green and efficient solution for the recycling of industrial solid waste.