Thread Content
According to the original design, if the inverter of the 101-BJ induced draft fan fails, it will automatically switch to power frequency operation. The automatic switching is only an experiment and has not been encountered in the real production process. During this drive, the frequency converter of the induced draft fan of 101-BJ failed. During the drive on the 28th, due to being busy, I suddenly found that the negative pressure of the auxiliary boiler dropped very low. After investigation, it was found that 101-BJ had a variable frequency and automatically switched to power frequency operation. Because the load was low at that time, the speed was low during variable frequency operation. Therefore, when switching to the power frequency auxiliary boiler and the first-stage furnace, the furnace negative pressure and oxygen content increased to varying degrees. 1. The speed of the induced draft fan 101-BJ can be adjusted during frequency conversion, and the maximum rated speed is 1100rpm. 2. When running at power frequency, the speed is constant at 960rpm. 3. If it runs at power frequency, according to the previous working conditions, it will seriously restrict the continued load operation of the device after it resumes operation, because when the load was 85% before, the speed of the induced draft fan was basically around 996rpm. 4. In order to eliminate this factor, the induced draft fan inverter must be put on standby. Later, due to the failure of the 101-J air compressor, during the process of resumption of operation after the maintenance of the air compressor, the raw gas system was withdrawn, the fire in the first furnace and auxiliary boiler was extinguished, and the treatment was carried out, and now it is operating normally. 5. At that time, we considered forcibly opening XV-52 and using medium-pressure steam to extract a section of the furnace's negative pressure. As long as the negative pressure of the auxiliary boiler was not high and the interlocking was enough, it was found in actual operation that opening XV-52 could not meet the requirements, and the medium-pressure steam consumption was too large. At the same time, considering that withdrawing the raw gas in a short period of time would not have a great impact on the start-up progress of the entire device, we decided to withdraw the entire system.