The installation of economizers and condensers for industrial boilers can effectively improve the operating efficiency of the boilers and reduce the temperature of flue gas emissions, thus saving energy and reducing emissions. Today, Zhengzhou Fangkuai Boiler Company will focus on the energy-saving accessories for you.
In the economizer equipment, if the user uses it improperly, over time, it will cause the economizer to wear out, which is very unfriendly to the boiler. To avoid this problem, we must first understand the causes of the wear and tear of the economizer, and then prescribe the right medicine and solve it in a targeted manner.
When the flue gas enters the vertical flue where the economizer is arranged from the horizontal flue, due to the centrifugal force generated by the flue gas's turning flow, most of the ash particles are thrown to the rear wall of the tail flue, causing the fly ash concentration in this part to be greatly increased. Increase, causing the boiler
The economizer pipe section near the wall is severely worn.
When there is a large gap between the tube and the wall of the economizer close to the wall or there is a flue gas corridor between the tube rows, the flow resistance of the flue gas in the flue gas corridor is much smaller than the resistance at other places. The flow rate is high. Therefore, the pipe or elbow next to the flue gas corridor is prone to severe wear. Practice has proved that the flue gas flow rate in the tube bundle is 4～5m/s, while the flow velocity in the flue gas corridor will be as high as 12-15m/s, which is 3～4 times that of the former, and its wear rate will be dozens of times higher. Because the degree of pipe wear is approximately proportional to the cube of the smoke velocity.
Knowing the reasons for the wear of the economizer, we can propose specific methods to prevent wear.
(1) Protective tile: Cover the heated surface that may be severely worn with a cover, and only need to replace the worn protective tile during maintenance.
(2) Protective curtain: Use curtains to protect the entire row of straight pipes or whole elbows in the flue gas corridor and near the wall.
(3) Partial use of thick-walled pipes: when the pipes are densely arranged and it is difficult to install or replace the protective tiles, a section of thick-walled pipes should be appropriately used in places that may be severely worn to extend the service life.
(4) The heating surface is turned over: due to uneven wear, in order to make the heating surface of each part basically reach the same service life, the economizer adopts the method of turning over, that is, the economizer is removed and turned over during the overhaul. , And then put it in (replace the unqualified pipe), so that the side that has been worn thinner is on the back of the flue gas, and the side that has not been washed by the flue gas is adjusted to face the flue gas flow, which reduces the cost , It also improves the service life of the energy saver.
