Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method

A technology of urea catalytic hydrolysis and urea, which is applied in the direction of ammonia preparation/separation, etc., can solve the problems of slow response rate of common urea hydrolysis technology systems, and achieve the effects of short hydrolysis reaction time, increased reaction speed, and less consumption of urea

Active Publication Date: 2015-12-09
DATANG ENVIRONMENT IND GRP +1
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Problems solved by technology

Ordinary urea hydrolysis technology system response rate is slow

Method used

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  • Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method
  • Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method

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Embodiment Construction

[0029] The structure, principle and working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] figure 1 A flow chart of a thermal power plant flue gas SCR denitrification urea catalytic hydrolysis ammonia production system provided by the present invention. The system includes a reaction system, a urea solution supply system, a steam supply system, an ammonia-air mixing system, a sewage system, a desalinated water system, a catalyst feeding system, a backflush system, a sewage discharge and a safety system.

[0031] The process of using the above system for flue gas SCR denitrification and urea catalytic hydrolysis to produce ammonia is as follows:

[0032] 1) The urea aqueous solution with a mass concentration of 50% is added to the reaction system from the urea solution storage tank (50-80°C heat preservation) 5 through the urea solution pipeline.

[0033] The reaction system has designed a double-chambe...

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Abstract

The invention discloses a flue gas SCR denitration urea catalytic hydrolysis ammonia production system and a method. The system mainly comprises a reaction system, a urea solution supply system, a steam supply system, an ammonia-air mixing system, a sewage discharge and safety system, a catalyst feeding system, a back blow system. By means of the system, fast hydrolysis reaction of molten state urea can be carried out under a temperature of 135-160DEG C and a pressure of about 0.4-0.9MPa. The reaction speed is enhanced by about more than 10 times than that of the traditional hydrolysis method, the response time can be less than 1min, and the energy consumption is about half of the pyrolysis technology. The system and method provided by the invention have the advantages of fast urea hydrolysis rate, small urea consumption, short hydrolysis reaction time, and realization of automation.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a system and method for producing ammonia by catalytic hydrolysis of urea for flue gas SCR denitrification. technical background [0002] my country's main power supply is coal-fired thermal power generation, and the nitrogen oxides NOx produced by coal combustion are the main pollutants that cause light fog and acid rain. The main means of controlling NOx emissions is combustion flue gas denitrification. Among many flue gas denitrification processes, Selective catalytic reduction (SCR) is the method with the highest efficiency and the most mature technology and process. At present, the most commonly used SCR technology is based on the use of ammonia to reduce NOx in flue gas to N 2 and H 2 O. [0003] my country's denitrification market has developed in recent years and has a relatively deep understanding. In qualified power plants, the liquid ammonia system is use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/08
Inventor 孟磊李春雨肖志均丁艳军邹红果刘东旭
Owner DATANG ENVIRONMENT IND GRP
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