Ensure safe and long-term economic operation of equipment

Excessive ammonia escape will corrode catalyst module, causing catalyst deactivation (failure) and blockage, greatly shortening catalyst life, escaping ammonia gas, and SO3 in flue gas will generate ammonia sulfate (corrosive and cohesive) and attach to equipment and pipe downstream of denitration unit reactor, which will cause the harm of blocked deposition, corrosion and pressure reduction. At the same time, the support body where the catalyst is placed will be corroded.

The results show that when the ammonia escape is about 2ppm, the resistance of air preheater will rise by about 30% after half a year of operation. When the ammonia escape volume rises to about 3ppm, the operation resistance of air preheater will rise by about 50% after half a year operation. In the actual operation, ammonia injected into denitration system is generally higher than the theoretical value, Although denitrification efficiency increases with the increase of ammonia escape, it will also cause waste of raw materials. This not only reduces the service life of related equipment, but also increases the operation and maintenance cost.

Adapt to more stringent environmental requirements

At present, it is a very important task for power generation enterprises using SCR denitration system to ensure NOX emission up to standard through minimum ammonia escape. When most coal-fired thermal power enterprises operate in low efficiency denitration system, ammonia escape rate is almost zero, but there is still a certain ammonia escape at this time, especially with the decline of catalyst activity and the uneven distribution of NOX concentration in the tail flue, the ammonia escape amount will gradually increase. With the increasingly strict environmental protection on NOX emission standards, the ammonia escape rate will increase, Therefore, the accuracy of ammonia escape detection is particularly important.

In situ laser gas analyzer produced by Hanhai photoelectric technology adopts the most advanced gas detection technology in the world, laser absorption spectrum technology, which can monitor the gas concentration in the discharge and denitration process pipeline. The product is installed in situ, without direct detection of gas sampling, and it reflects the real situation on site in real time. It is suitable for monitoring ammonia escape monitoring in denitrification process. It has high sensitivity and millisecond response speed, and can detect the change of its small gas concentration in the first time, avoid leakage and timely warn; The monitoring accuracy is high, fingerprint detection is not false, which provides reliable and effective guidance for monitoring denitration process; There is no need for regular calibration. The product adopts contactless detection, which almost has no loss to the equipment itself. Therefore, it does not need to calibrate frequently, and has a long service life, which saves a lot of maintenance and equipment replacement costs.

Hanhai photoelectricity is a state-owned enterprise holding scientific research achievements of laser absorption spectrum detection, and a leader in technology and market application in this field. Products and technologies are always at the forefront of global laser spectroscopy technology research and development and application, with the overall advantages of domestic leading and international advanced recognized by the former State Administration of work safety.