Urea catalytic hydrolysis reactor for flue gas denitrification and method

Abstract

The invention relates to a thermal power plant flue gas denitration technology, in particular to a urea catalytic hydrolysis reactor for flue gas denitration and a method. The system comprises a kettle body and a coil pipe cluster fixedly arranged in the kettle body through a plug; a urea solution inlet is formed in the bottom of the kettle body, and an ammonia outlet is formed in the top of the kettle body; a saturated steam inlet and a drain outlet are respectively formed in the outer side of the plug; the coil pipe cluster comprises a plurality of coil pipes inserted into the kettle body; the end part of the coil pipe is fixed with the inner side of the plug, the outer surface of the coil pipe is coated with a catalyst coating, the inlet end of the coil pipe is communicated with the saturated steam inlet, the outlet end of the coil pipe is communicated with the drain outlet, and the coil pipe is a U-shaped pipe made of a 316L stainless steel material; a partition plate is arranged on the bottom surface in the kettle body; the coil pipe cluster is arranged at one side of the partition plate, and the bottom surface of the kettle body on the other side is provided with a drain outlet. The reactor has the advantages of economy, feasibility, simple structure, convenience in catalyst supplement and long service life.

Description

technical field [0001] The invention relates to flue gas denitrification technology in thermal power plants, in particular to a urea catalytic hydrolysis reactor and method for flue gas denitrification. Background technique [0002] Selective catalytic reduction (SCR) is currently the most widely used flue gas denitrification technology in my country, and ammonia is mainly used as the reducing agent in the process. There are three sources of ammonia: liquid ammonia, urea and ammonia water. In recent years, domestic and foreign power generation companies have paid more and more attention to the potential dangers in the use of liquid ammonia. In the next few years, the market demand for urea ammonia production technology will be huge. Urea ammonia production includes two methods: pyrolysis and hydrolysis. The hydrolysis technology has the characteristics of high urea conversion rate, few by-products, and only low-grade steam can meet the heat demand of hydrolysis reaction. It...

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Problems solved by technology

[0010] During the use of existing hydrolysis devices, the common problems are large reactor volume, slow load response rate, and blockage of sewage pipes by hydrolysis intermediate products. At the same time, existing hydrolysis devices generally use hydrogen phosphate or dihydrogen phosphate, etc. The liquid hydrolysis catalyst has a large loss and needs to be replenished at any time, and will cause phosphorus compounds in the wastewater, and direct discharge will cause eutrophication of the water body; in addition, the solid catalyst proposed in the relevant patent is difficult to arrange and replace in the narrow reactor space

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