Efficient energy-saving denitration reducing agent gasification system and applications thereof

Abstract

The invention discloses an efficient energy-saving denitration reducing agent gasification system and applications thereof, wherein the system comprises an ammonia water preparation unit, an ammonia water storage unit connected to the ammonia water preparation unit, and an ammonia water flash evaporation unit connected to the ammonia water storage unit, wherein the output end of the ammonia waterflash evaporation unit is connected to a power plant denitration system. With the application of the system to a denitration system of a power plant, the system has the ammonia water flash evaporationunit to perform rapid and efficient flash evaporation on low-concentration ammonia water so as to increase the concentration of the ammonia water to 50%, so that the denitration efficiency is improved, and the influence on the service life of a catalyst in denitration equipment is reduced. According to the technology, in a power plant adopting liquid ammonia vaporization, the ammonia area can betransformed with the lowest investment to replace class B dangerous sources such as a liquid ammonia tank and the like so as to eliminate the hidden danger of burning explosion.

Description

technical field [0001] The invention relates to the technical field of denitrification in power plants, in particular to a high-efficiency energy-saving denitrification reducing agent gasification system and its application. Background technique [0002] At present, most of the denitrification processes in thermal power plants in my country use catalytic reduction (SCR) with ammonia as the reducing agent. Several methods of ammonia manufacturing systems include: [0003] 1. Water bath method: use medium temperature water to heat liquid ammonia to generate gaseous ammonia. The evaporation efficiency of this method is low, and the volume of the gasification equipment is large. [0004] 2. Ammonia water method: Ammonia water is directly injected into the flue, and a large amount of water also enters the flue and evaporates, resulting in high energy consumption and shortening the service life of the catalyst. [0005] 3. Urea method: use hydrolysis or pyrolysis of urea to gene...

AI Technical Summary

Problems solved by technology

The evaporation efficiency of this method is low, and the volume of the gasification equipment is large

[0004] 2. Ammonia water method: ammonia water is directly injected into the flue, and a large amount of water also enters the flue and evaporates, resulting in high energy consumption and shortening the service life of the catalyst

[0005] 3. Urea method: use hydrolysis or pyrolysis of urea to generate liquid ammonia or ammonia gas, but the energy consumption is large and the operating cost is high

[0008] 1. Due to the low concentration of ammonia water (20% concentration of ammonia water), the efficiency of denitrification is low;

[0009] 2. Low concentration of ammonia water also contains a lot of water, which reduces the service life of the catalyst;

[0010] 3. Low-concentration ammonia water contains a lot of water, and its vaporization easily takes away a lot of heat, resulting in high energy consumption and high operating costs for the denitrification process as a whole

Liquid ammonia is used, which is low in safety and requires a safe distance

The main problems of urea are: (1) high raw material cost and high operating cost; (2) inconvenient dissolution and storage, high energy consumption, and a large amount of heat source; (3) high labor intensity and poor site conditions; (4) Large area and high investment; (5) A lot of water is sprayed into the boiler and catalyst (6) It is easy to block the pipe, resulting in shutdown for maintenance

The main problems of ammonia water are: (1) due to the low concentration of ammonia water (about 20%), a large amount of heat energy is taken away during operation

(2) It is easy to cause catalyst poisoning and reduce the service life of the catalyst

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