How to use the rotary air preheater daily

How is the rotary air preheater used normally? In the process of using the rotary air preheater, due to the equipment itself or the misoperation, it will often encounter problems such as excessive current swing and secondary combustion, which will seriously affect the service life of the rotary air preheater. It also seriously interferes with the normal operation of the power generation company. Therefore, this article briefly introduces the issues that should be paid attention to when using the rotary air preheater.

First, set a reasonable interlock protection, when an air preheater main motor trips, if the auxiliary auxiliary motor does not self-investment, it should be interlocked to close the flue gas side inlet baffle, so that the flue gas side flue gas continues to heat storage The hot plate causes the deformation of the heat storage plate to increase. At the same time, the interlocking opening of the outlet baffles at the outlets of the A and B side fans is required. At this time, the operator needs to manually move the air preheater on the spot. Because the two induced draft fan inlets have contact pipes, when the single-side draft fan trips, it will not affect the operation of the air preheater. However, due to the different inlet resistance of the two air preheaters, the temperature of the air preheater outlet will produce a difference in smoke temperature. You can use the air preheater inlet damper to adjust.

Second, to prevent large current swing of the air preheater. Before starting the boiler, the air preheater must be put into operation as soon as possible. On the one hand, it can be found in advance whether there is a problem with the air preheater. On the other hand, it can prevent the smoke temperature from being too high during the start-up process. Air preheater deformation. The normal operation of the boiler should strictly control the smoke temperature change rate, in the process of lifting the load, strictly control the temperature of the boiler flue gas temperature, so as not to cause thermal deformation of the air preheater.

Third, a reliable power supply design should be adopted. The rotary air preheater is provided with one main motor and one auxiliary motor. When the air preheater main motor trips, the backup auxiliary motor should be self-propelled, so the main power supply of the main and auxiliary motors Should be set on different buses, and there should be a reliable backup power supply. The main motor power supply of Yuncheng Power Generation Company is connected to the furnace PC. The auxiliary motor power supply is connected to the security section, which effectively ensures the reliable power supply of the air preheater.

4. Prevent secondary heating of the air preheater heating surface. Under the boiler operating condition, the furnace chamber will be under positive pressure. The temperature of the unilateral exhaust will increase abnormally and exceed the normal temperature by more than 50° C., and there will be large deviations in the temperature of the exhaust smoke on the left and right sides. When it is found that there is an abnormal increase in the temperature of one side of the air preheater and the secondary combustion of the air preheater is suspected, the manhole door of the air preparator should be opened to check the internal ignition location, ignition conditions, and the degree of ignition.

Rotary air preheater has been widely used by the electric power workers because of its wide range of applications. However, in practice, it often encounters various kinds of breakdowns. In the daily work of electric power workers, equipment should be carefully maintained and protected. Rotary air preheater normal operation.