1. 1 working principle of acoustic soot blower
Acoustic soot blower (diaphragm type) uses metal diaphragm to generate acoustic waves under the action of compressed air, and high loudness acoustic waves produce high acceleration peeling and vibration fatigue crushing effects on accumulated dust, and the accumulated dust falls off loosely.
1.2 working principle of steam soot blower
Steam soot blower uses the jet impact of high-pressure steam to clean the dust on the surface of equipment.
Comparison of 1.3 principle
Acoustic soot blowing technology is to feed strong acoustic waves generated by modulating high-pressure airflow into the reactor space by using an acoustic generator. Due to the omni-directional propagation of sound waves and the high-speed periodic oscillation of air particles, the dust particles on the surface can be separated from the catalyst and suspended, thus being carried away with the flow of flue gas. The mechanism of sound wave ash removal is "sweeping", and the energy carrier output by the soot blower is "sound wave", which exchanges energy with the ash deposited on the catalyst surface through the sound field, thus achieving the effect of ash removal, and the acting force is "AC". The traditional high-pressure steam soot blower is a "touch" mode, the output energy carrier is a "steam jet", and the dust on the catalyst surface is directly hit by the momentum of the "steam jet" to make it fall off, and the acting force is a "DC" amount. Compared with "DC" and "AC", "alternating" force should make soot fall off more easily.
2. Analysis of technical characteristics in 2.SCR application
2. Effect of1on catalytic activity
Acoustic soot blower is a preventive soot blowing method to prevent ash powder from accumulating on the catalyst surface, while steam soot blowing is carried out after the ash has formed a certain thickness. Sonic soot blower can keep the catalyst clean continuously and make full use of the catalytic activity of the catalyst to carry out denitrification reaction.
2.2 Influence on catalyst life
Experiments and field tests show that the sonic soot blower has no toxic and side effects on the catalyst. Due to the influence of humidity, the long-term operation of steam soot blower has a great influence on the failure of catalyst, which is in danger of corrosion and blockage of catalyst. In addition, some foreign case studies show that calcium poisoning of catalyst is more likely to occur in high CaO coal projects than in sonic soot blowers.
Acoustic soot blower does not wear the catalyst, which prolongs the service life of the catalyst. It is a non-contact soot blowing method and reduces the SCR.
The maintenance cost is. The method of steam soot blowing relies on the impact of mechanical steam to clean the ash. The high-speed steam flow mixed with dust has very serious wear on the catalyst surface, which leads to the shortened service life of the catalyst and high maintenance cost.
2.3 soot blowing coverage
Acoustic soot blower does not have the problem of cleaning dead corners. Because the acoustic soot blower relies on non-contact acoustic waves, the dust falls off the surface of the structure and is taken away by the smoke, and the acoustic waves reflect and diffract back and forth on the surface of the structure, so there is no dead angle and the cleaning is very thorough. Steam soot blowing relies on the impact of mechanical steam to realize ash cleaning. At the end of steam flow, the impact of steam is greatly attenuated, and the soot blowing effect is poor, resulting in serious local ash accumulation and dead angle in ash cleaning.