Ammonia decomposition furnace lining material

catalyst

 

　　The gas produced by the coke oven must be subjected to various complicated purification treatments before it is sent to the user to recover useful substances such as benzene and remove harmful gases such as hydrogen sulfide, ammonia, hydrogen cyanide and the like. In the early 1990s, the Shijiazhuang Coking Plant introduced an advanced gas purification and chemical recovery unit from Germany. After several years of actual operation, it has been shown that the purification equipment not only has the characteristics of simple process, safe and reliable operation, but also effective Solve serious equipment corrosion and environmental pollution problems in the old process. At present, the Anshan Coking Refractory Design and Research Institute of the Ministry of Metallurgy is responsible for the introduction of pirated copies. Several domestic large-scale steel coking plants, such as Maanshan Iron and Steel, Kunming Iron and Steel, Handan Iron and Steel, Benxi Steel, Lingang, Wuhan Iron and Steel, Baotou Steel and other coking plants have been built. This recycling device. Among them, there are more than 68 ammonia decomposition furnaces and Claus furnaces for ammonia decomposition sulfur recovery. In the new process of coke oven gas purification, the coke oven crude gas produced contains harmful gases such as NH3 and trace amounts of HCN, which are decomposed into N2, H2 and CO2 by an ammonia decomposition furnace, and the H2S contained therein is recovered by sulfur production from the Claus furnace system. YWC-95 ammonia decomposition catalyst is developed for this ammonia decomposition furnace and Claus furnace and can replace the imported G-117 coke coal gas purification catalyst.

 

　　YWC-95 ammonia decomposition catalyst was produced to meet the needs of the market. We developed joint development with the Chemical Engineering Department of Tianjin University and the WISCO Coking Plant. At the end of 1993, we first completed the analysis of imported samples. In 1994, it was the first in Tianjin University. The activity evaluation device for the ammonia decomposition catalyst was completed, and the small test and the pilot test were completed. In 1995, we carried out industrial production, and in the same year, the first batch of 17 tons was supplied to the WISCO Coking Plant for trial use.

 

　　On April 8, 1996, the WISCO Coking Plant II recovered the ammonia-sulfur section. The catalysts of our plant were summarized by the practice. The ammonia decomposition rate was above 98%. After the ammonia decomposition furnace, the ammonia content of the tail gas was less than 0.5g/m3. The performance is fully up to the level of imported catalyst. YWC-95 type catalyst is a porous synthetic magnesia-alumina carrier sintered from high-refractory MgO and AL2O3, and then calcined by several times impregnating nickel nitrate solution. It is proved that this synthetic magnesium aluminum crystal Stone water resistance is better than single periclase (MgO).