The flue gas online monitoring system manufacturer will answer the questions of the SNCR denitration device for the boiler heating surface.

Flue gas online monitoring system manufacturers to answer your questions about the impact of SNCR denitrification device on boiler heating surface operation

The SNCR denitration technique injects a urea solution into the furnace as a reducing agent. During the normal operation of the boiler, it will not cause obvious corrosion to the heating surface system in the furnace:

1) The denitration system sprays the denitration agent into the furnace without increasing the acidity of the furnace atmosphere. Urea is weakly alkaline, so the denitration agent as a whole is weakly alkaline, which is beneficial to reduce corrosion from the viewpoint of acid-base corrosion. From the chemical process of denitrification, NH3 consumes NOx to form neutral N2 and water, while NOx is more acidic than cyanate. Therefore, after denitration, the acidity of the furnace atmosphere will decrease.

2) The denitration agent sprayed into the furnace only accounts for a small part of the material and gas in the furnace, except for the selective removal of NOx (the content of NOx in the flue gas is also low), and the denitration agent is in the furnace. There is no significant impact on the atmosphere and the nature of the charge;

3) The reducing agent injection point is at the inlet flue of the cyclone separator. The main reaction zone for denitration is a cyclone separator. The fire-resistant and wear-resistant material is applied to this area of ​​the boiler, which has good corrosion resistance.

4) Desulfurization in CFB furnace reduces the content of SO2 and SO3, which reduces the possibility of generating ammonium compounds NH4HSO4 and (NH4)2SO4, but under special conditions, the water in the denitration product plus the harsh environment of the flue gas medium still There may be corrosion and contamination on the heated side.

Shandong Xinze Instrument Co., Ltd. has developed an online monitoring system for flue gas in the chimney according to environmental protection requirements. The system starts from the actual situation of the enterprise, and the technical strength of the maintenance operator is weak, the use environment is poor, and the smoke in the chimney is online. The quality and operation of the monitoring system are simple and excellent. The system can monitor the environmental protection requirements of SO2, NOX, particulate matter, oxygen content, temperature, flow rate, pressure, humidity and other main indicators in real time for 24 hours. It has the concentration to measure the above components (parameters). Value and accumulated emission value function and data storage and printing functions, and the monitored data can be sent to the environmental protection departments at all levels through the supporting environmental monitoring network system in a timely and real-time manner.

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