Recently, the reporter learned from Nanjing Southeast Industrial Equipment Co., Ltd. that the research and development of the exhaust gas denitration device for domestically produced new high-efficiency non-toxic catalyst marine diesel engine (purchasing and supply) was carried out by the company and the technical team of Zhushangmin of Nanjing University of Technology. Test phase. The device verification test is expected to be fully completed by the end of October and will be available to the market early next year.
The new high-efficiency non-toxic catalyst tail gas out-sale device adopts selective catalytic reduction technology (SCR), which is mainly composed of urea supply and injection device, reactor and electronic control unit. The reactor adopts multi-point monitoring (purchasing and supply of product warehouse), and timely corrects relevant data through the control system (purchasing and supply of product library); the catalyst adopts the rare earth-based catalyst technology independently developed by Zhusinmin technical team to integrate rare earth materials and catalyst carriers into The integrated, non-toxic and harmless rare earth composite has small volume, long service life and high denitration efficiency, and will not cause secondary pollution. Rare earth-based catalysts have been widely used in the domestic industrial denitration field, and the denitration efficiency exceeds 92%, which can completely replace the commercially available toxic vanadium-titanium catalysts supported by foreign technologies.
As the environmental awareness of the entire society continues to increase, the requirements for ship exhaust emissions are becoming more and more stringent internationally. The 66th Session of the International Maritime Organization (IMO) Marine Environment Protection Committee (MEPC 66) stipulates that since January 1, 2016, new shipbuilding diesel engines must meet Tier III emission standards to achieve significant reductions in marine diesel NOx. The goal of emissions. Under the current technical conditions, the use of SCR system devices is an effective way for ships to meet Tier III emission standards. At the heart of the SCR system is the catalyst, and the operating costs of the SCR equipment depend to a large extent on the life of the catalyst. Prior to the advent of rare earth-based catalysts, vanadium-titanium catalysts were used at home and abroad, containing highly toxic vanadium pentoxide. Vanadium pentoxide has considerable solubility in water, which can cause serious damage to the human respiratory system and skin. Long-term exposure can cause bronchitis, visual impairment, and kidney damage. This denitration catalyst not only causes pollution during the production process, but also forms secondary pollution after being discarded. At this stage, there is not a qualified enterprise in China that can detoxify the failed vanadium-titanium catalyst. The national environmental protection department has listed the failed vanadium-titanium catalyst as a hazardous substance. Shandong and other places have successively issued local regulations, prohibiting the use of catalysts containing toxic vanadium-titanium system. According to industry analysts, this means that ships using vanadium-titanium catalysts in the future should not enter areas where catalysts for the use of vanadium-titanium systems are prohibited. Domestic marine SCR equipment manufacturers are prepared for this.
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