Liquid ammonia and ammonia filter in power plant

  The SCR denitration system of liquid ammonia in power plant uses liquid ammonia as reducing agent
The SCR denitration system consists of three subsystems: SCR reactor and auxiliary system, ammonia storage and treatment system and ammonia injection system

The current SCR process flow is as follows: the ammonia station of the power plant uses liquid ammonia (about 1
6Mpa) to reduce the pressure to 0
2-0
6mp through the pressure regulating valve (flowmeter) and enters the ammonia evaporator for evaporation
After passing through the ammonia buffer tank, it controls a certain pressure and flow to mix evenly with the dilution air in the mixer, sucks it into the flue through the ammonia injection grid, and carries out de marketing reaction in the SCR reactor to remove No

At 0
2 MPa & mdash; 0
6MPa liquid ammonia enters the evaporation pipe in the ammonia evaporator and is heated and evaporated to more than 40 degrees, The heating source is the steam pipe in the evaporator (at about 350 degrees, 1
0 & mdash; 1
3mpa auxiliary steam) during the evaporation of liquid ammonia, sometimes the condensed water will freeze and block the ammonia evaporator
In addition, there is another case, that is, during the transportation and storage of liquid ammonia, some mechanical impurities, falling objects on the inner wall of the pipeline and oil and water entrained in the process of compressed liquid ammonia by the air compressor will be generated
When entering the evaporator, the flow regulating valve and evaporator disc will be blocked Pipe blockage
Ammonia is mixed evenly with dilution air in the mixer at a certain pressure and flow rate, and is transported to the ammonia injection grid suction flue through the valve and ammonia flowmeter
Impurities will also be generated in this link, which will affect the efficiency of SCR off-line system
Impurities will cause frequent blockage of valves, flowmeters and pressure gauges, which increases the difficulty of work and maintenance costs, China's power plants mostly introduce the process technology of FLOWTECH company of France or the technology of other companies
Some power plants use the main core equipment provided by ceram company of Austria and other companies, complete set of flue gas analysis, flue system, SCR reactor, catalyst, ammonia injection system and ammonia injection system