Recycle the steam used for oven drying to improve oven stability

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The Multi-Feed Slurry Gasification Workshop of Shaanxi Chemical Fertilizer Company recently successfully installed a liquid separation tank on the S4 steam main to recover steam condensate, which is then sent via the process condensate main to the desalinated water system for recycling before being reused in the production process. This approach also completely eliminated the problem of dripping caused by water in the steam vent lines in corridor 083 of the 704B unit area, achieving both cost savings and improved operational efficiency as well as effective resolution of the issue on-site. During furnace drying, this gasification system relies on S4 steam to create negative pressure by using an extractor; however, due to the small number of users of system S4, the steam contains a significant amount of water, which results in large fluctuations in the negative pressure during furnace drying. This affects the progress of furnace drying, and it also leads to numerous leaks in the S4 steam pipelines as well as disorderly discharge of vapor and liquid at the vent points. Over time, this has caused dripping issues in the 083 pipeline corridor of the 704B plant area, representing a major challenge in the on-site management of this gasification workshop. Although the workshop installed drain pipes at the end of the S4 main pipe to address this issue, the problem has not been completely resolved. The company brought together technical personnel from relevant departments and workshops to brainstorm and conduct thorough evaluations, and decided to install a separation tank with a capacity of 5.2 m3 on the S4 steam main in order to separate steam into gas and liquid phases, followed by collecting and reusing the liquid phase. Through joint efforts, a large amount of preliminary work was completed in a short period of time, including drawing design, construction plans, material preparation, and task allocation among personnel. The technical renovation work began in early April; after two rounds of modification and testing, the liquid separation tank and auxiliary line systems were completed and put into operation officially in May. As of July 20, data from over two months of operation show that approximately 10 T/h of steam can be saved, and around 15 T/h of condensate can be recovered. The negative pressure stability of the gasification furnace has been significantly improved. The recovered steam and condensate are continuously sent to the desalinated water system for use in the system circulation. The phenomenon of \"rain above and steam below\" at the 704B unit site has been completely eliminated, greatly improving the environmental conditions at the gasification production site.