Analyze the reasons why the boiler is short of water
Thread Content
1. The boiler is 10 tons/hour, the working pressure is 8.5kgf, and the generated steam enters the 12-inch steam pipe network in the factory (at the end of the pipe) 2. The boiler water supply pump is 50m3/h, with a lift of 150m 3. There is a set of five steam valves of 5/5/10/10/10 inches at the end of the pipe. They are usually closed and will be opened twice a day to exhaust air (a few minutes each time). 4. The boiler low liquid level interlock burner TRIP has occurred several times. Please check it and add a signal tracking program to show that the motor is running (it often occurs in the middle and night shifts, I checked it). I speculate.: 1. When the steam valve is emptied, the liquid level of the boiler is just low, and the evaporation volume suddenly increases so that the water replenishing pump has no time to replenish water.
Haichuan is a land of hidden dragons and crouching tigers. I look forward to all the sea friends clarifying their doubts.
What kind of boiler is left unattended and not afraid of something happening? The Technical Supervision Bureau doesn't care
The exhaust volume to the air is too large and the time is too long, resulting in low water level. Your exhaust caliber is too large, and both are opened at the same time. Generally, you open the two outlet 133 or 159 of a 10-ton boiler at the same time. The cross-sectional area is much larger than the normal one. It is recommended to exhaust 30 seconds each time, and exhaust 4 times every 3 minutes. It should not happen.
My opinion seems to be that the liquid level in the steam drum will rise when the steam is emptied. Because the pressure is low, the amount of steam generated by the incoming water should also be reduced. Only when the sewage is drained, the liquid level in the steam drum will decrease.
Yes, what the 6th floor said is right, but because the instantaneous flow rate is too large, the water level will definitely drop below the bottom limit. There may be some calculation errors in the system design, and the extreme conditions are not taken into account.
Waste heat boilers (burning waste liquid) are not as lucky as you. One of our operators is responsible for a set of waste liquid incineration boilers, a set of solid incineration boilers, 5 sets of waste gas treatment equipment, 3 sets of freezers, 6 sets of centrifugal air compressors, a set of cooling water towers and a set of PSA nitrogen generators.
1. This exhaust is not designed to be discharged by the system itself, but after the boiler steam is merged into the pipe network, there is an emergency exhaust gas treatment system 20 meters near the entrance (in this system, when the gas is replaced, the steam valve automatically opens the purge tower to prevent VOC accumulation from causing a gas explosion during re-ignition) 2. I checked the curve and found that the steam pressure is about 8.0kgf under normal conditions (pipe network 7.5). Whenever the liquid level is low, the boiler pressure also drops to 7.1~7.3, so it should still be a problem of excessive evaporation. 3. Current approach: The opening of the front and rear manual valves of the five steam control valves has been halved, and the effects have been observed 4. Thank you for your participation
The instantaneous flow rate of steam in the pipe network changes from the normal 1000m3/h to 2000m3/h