The humidifying tower is prone to failure and preventive measures
Date：2019-07-17 16:04 Source：未知Views:
Humidifying tower plays a great role in the actual production, inevitably there will be a variety of problems, we should know more about some prone to failure and related preventive measures, this paper is a simple introduction for you.
1. The humidifying tower is compressed or deformed by negative pressure due to improper operation.
Normal humidifying tower shell weighed on about 7200 pa, but under the condition of high temperature casing pressure drop greatly, due to the preheater fan shell under the action of the pressure of about 4000-6000 pa, due to the preheater preheater due to improper operation, the exhaust gas temperature at the outlet of humidifying tower shell pressure drop greatly, shell under the action of high temperature and high pressure softening sucked flat or deformation, lead to accidents.
A cold air valve can be installed at the entrance of the humidifying tower to automatically open and cool down when the temperature at the entrance of the humidifying tower exceeds a certain temperature.It is also possible to set alarm when the inlet temperature of humidifying tower exceeds and automatically reduce the rotation speed of kiln tail fan. When the inlet temperature of humidifying tower exceeds, the kiln tail fan will automatically stop.
2. Dust bucket is easy to accumulate dust and become blocked in operation.
Because of the dust under the action of gravity and water particle adsorption of subsidence to the set of the gas conditioning tower bottom ash hopper, if ash hopper Angle more gentle, dust particles in the wet easy adhesion, back to grey ability in the operation of the small are likely to cause ash hopper dust jam, at the same time, if the collection of ash hopper shell outside heat preservation effect is poor, easy to cause to collected dust ash hopper wall dewing damp easily adhesion.
First, to check and transform the Angle of the dust hopper, increase the Angle, make the back ash slide smoothly;The second is to do a good job in the external insulation of the humidifying tower to reduce the condensation on the inner wall of the shell.Fourth, do a good job in the daily maintenance of the spray gun, reduce the dust due to poor atomization effect caused by the wet dust easily adhere to the dust bucket blocking accident.
3. Easy to "wet bottom" in operation.
Due to the poor atomization effect of spraying water, dust moisture and easy adhesion caused by the dust bucket blocking accident is also known as "wet bottom", the main reason is that the humidifier tower spray gun spray atomization effect is poor, or the distribution and length of the spray gun is not reasonable caused.The main reasons for the poor spray atomization effect of the water gun in the humidifying tower include big fluctuation of water pressure, low water pressure, serious wear of the nozzle of the water gun, etc. The key is to ensure the stable water level of the water tank, the water filter device does not block the smooth flow of water, and at the same time to regularly switch and maintain the multi-stage booster pump.Water gun should also be constantly switching maintenance, prepare enough nozzle spare parts, temporarily not used in the operation of the water gun to be external and rain and rust resistant materials will be water gun tightly wrapped (pay attention to the water gun jack with cover plate cover, put an end to air leakage).Spray gun distribution and the length of collocation is caused by unreasonable "wet bottom", it needs to be on the system the movement direction of the wind and trend analysis, at the same time take into account the humidifying tower itself cylinder set up at the entrance guide plate and the air distribution plate balance cylinder wind speed and flow rate in all parts of the cross section, according to the practical experience, two spear can't continuous arrangement, two pike can continuous arrangement.Because the wind speed and flow of the tube section of the humidifying tower itself, although the guide plate and air distribution plate are set to balance, but actually the wind speed and wind temperature in the center is higher than the wind speed and wind temperature around.
4. Water spray gun is easy to be blocked during operation.
There are two reasons why water spray gun is easy to block in operation. One is poor water quality, scale or impurities block.Second, there is no external water spray gun which is temporarily not used in operation, which causes the nozzle to be blocked by dust.
One is to clean the water tank and filter regularly, regularly check the use of the water gun, nozzle wear timely replacement processing.Timely replacement of filter damage;Two is temporarily not used in the operation of the water gun to external and rain rust resistant materials will be water gun tightly wrapped (pay attention to the water gun jack with cover plate cover, put an end to air leakage).
5, the water level of the tank is not stable, easy to break or overflow water waste.
This is mainly caused by the abnormal operation of the floating ball valve of the water tank. The original design is a floating ball valve, which is easily damaged due to the incomplete inspection and routine inspection.
Technical transformation can be carried out. Two floating ball valves can be set and the difference in height between upper and lower is 500mm, so as to improve the reliability of the floating ball valve and keep the water level of the water tank at a stable position of 2 meters.In this way, the water supply and work of the humidifying tower are stable, and the influence on the kiln grinding condition of the system is reduced.
6, humidifying tower shell cracking.
The main reason is the poor welding quality at the welding point. Because of the poor welding quality, the shell may produce stress concentration here, leading to tearing or opening at the welding place and aggravating the damage under the action of high temperature and high pressure.
The installation and welding shall be carried out in strict accordance with the construction specifications.General attention to the welding seam to full welding and to reach the height of the designed seam, conditional can be in the welding seam welding channel steel reinforcement.When the cylinder butt welding should prevent the occurrence of cross weld, weld should stagger more than 2 meters, whether the cylinder weld or butt weld, all need full welding.To internal and external welding, to clean slag after a layer of welding.At the same time, each weld shall be submitted to the construction unit for inspection before entering the next procedure.
7, back to the ash is not stable, more or less.
It is mainly caused by unstable working conditions of the kiln, large fluctuation of feeding and system wind or large air leakage in the system, which leads to the occurrence of material collapse in the humidifying tower.
The main purpose is to improve the operator's skill level, stabilize the kiln mill running condition, strengthen the daily system plugging work, and reduce the influence of air leakage on the working condition and fluctuation.