(1) the impeller direction of the installation of the reverse is the root cause of the ventilator motor current exceeds the trip. Therefore, in the bidirectional symmetrical inlet impeller ventilator assembly or overhaul, we must pay attention to the installation direction of the impeller and make a good mark, the general impeller are assembled according to the backward curved direction, that is, the back of the blade bow towards the front, concave towards the back, the manufacturer must be installed in the instruction manual has a special express this.
(2) when the fan repeatedly tripped and measured motor running current is normal, should consider the cause of the failure for the electrical components, such as by the thermal relay and other malfunction caused by; assembly fan after the test run, electricians should be to the scene in close cooperation with the detection of the motor startup, running current value is abnormal, so as not to cause losses or complicate the failure.
(3) assembly ventilator should pay attention to the installation size, belt tightness and impeller and collector clearance.
The phenomenon of circulating fluidized bed boiler water-cooled wall pipe burst:
1, the steam bag water level is lowered, and in severe cases, the steam bag water level drops sharply, and the feed water flow rate is abnormally larger than the steam flow rate.
2, the negative pressure of the furnace chamber is instantly positive and unstable.
3, furnace pipe leakage detection device alarm.
4, boiler combustion instability flame dark, serious boiler fire.
Circulating fluidized bed boiler water-cooled wall pipe burst causes:
1, improper combustion adjustment, flame skewing, resulting in water-cooled wall pipe wear by the coal dust scouring.
2, improper installation of the throttle ring, there are foreign objects in the pipe caused by poor water circulation.
3, the boiler serious water reduction improper treatment, continue to water so that the tube cooled sharply or boiler serious water reduction so that the tube overheating burst.
4, water-cooled wall expansion is blocked.
Circulating fluidized bed boiler water-cooled wall pipe burst treatment:
1, when the water-cooled wall pipe leakage is not serious to maintain the normal water level of the steam packet, you can appropriately reduce the parameters of the operation, reduce the load operation, closely monitor the development trend of leakage sites, do a good job of accident prevention, report to the chief of the duty, and ask for instructions as soon as possible to stop the furnace.
2, when the water-cooled wall pipe burst can not maintain the normal water level, immediately stop the furnace. After stopping the furnace to continue to strengthen the water, the water level can not return to stop the water, coal economizer recirculation door should not be opened.
Expanded information:
Boiler emergency stopping steps:
1, immediately stop the powder system and stop delivering fuel to the boiler (stop all powder feeders, fuel pumps, and close the fuel quick disconnect valve).
2, maintain 25% of the air volume, ventilation 5min after stopping the induced draft fan, fan. When the furnace steam, water pipe burst, in order to maintain the negative pressure of the furnace can be ventilated, and can retain a draft fan to continue to run. If the tail heating surface and the flue produces secondary combustion, then immediately stop the induced draft fan, blower, and tightly close the air door and flue baffle.
3, after stopping the furnace, due to emergency shutdown, the load drop is large, so that the steam pressure rise and cause water level changes, such as more than the range, should take measures (open the accident water discharge door and to the air discharge door) to maintain within the prescribed range.
4, such as water-cooled wall and coal economizer burst, after stopping the furnace is prohibited to open the coal economizer recirculation door.
5, the other operations after the furnace shutdown and the normal shutdown of the operation is similar.
Baidu Encyclopedia - Circulating Fluidized Bed Boiler
Boiler water-cooled wall leakage, pipe burst phenomenon, causes and treatment
I. Phenomenon:
1: the lowering of the water level of the steam turbine, and in severe cases, the level of the steam turbine drops dramatically, and the feed water flow rate is abnormally greater than the steam flow rate
2: the negative pressure of the furnace chamber instantaneous bias and unstable
3: the furnace tube Leak detection device alarm
4: from the inspection hole, door, furnace wall and other tight places may be sprayed outward smoke and water vapor, and there is a clear sound of leakage
5: the main steam flow, the main steam pressure drop
6: leakage of all sections of flue gas temperature drop, the exhaust temperature decreased
7: boiler combustion is unstable flame darkness, serious boiler fire
8: pilot water flow is abnormally large than steam flow
9: boiler combustion is unstable and unstable, the boiler fire caused by a serious
10: boiler combustion is unstable and unstable p>
8: the induced draft fan cast automatically, the static lobe opening increases abnormally, the current increases
Two reasons:
1: feed water, furnace water quality is not qualified, so that the tube wall corrosion or scaling over-temperature
2: the furnace water pump is out of order, resulting in poor circulation of the furnace water
3: combustion is not properly adjusted, the flame is skewed, resulting in the water-cooled wall tube by the coal dust flushing Abrasion
4: improper installation of the throttle ring, there are foreign objects in the pipe resulting in poor water circulation
5: the wall of the pipe wall for a long time over-temperature operation
6: sootblowers leakage or failure to exit the normal, the steam blowing through the furnace tube
7: the quality of the pipe is unqualified, the quality of the weld is poor
8: water-cooled coking wall
9: the large pieces of coke smashed water-cooled wall tube
10: boiler overpressure operation for a long time
11: boiler start-up temperature, pressure too fast
12: tube aging failure
13: boiler serious water reduction improperly handled, continue to water to make the tube cooled dramatically or boiler serious water reduction to make the tube overheating rupture
14: the water-cooled wall expansion is blocked
three, treatment: the water-cooled wall of the water-cooled wall tubes, the water-cooled wall of the water-cooled wall tubes.
1: when the water-cooled wall tube leakage is not serious to maintain the normal water level of the steam bag, you can properly reduce the parameters of operation, load reduction operation, closely monitor the development trend of the leakage site, do a good job in anticipation of accidents, report to the head of the duty, instructions to stop the furnace as soon as possible
The water-cooled wall of the boiler tube burst there are many reasons for the experienced person, look at the burst port know what the reason. Most of them are because of the tube wall scaling to create the city's reasons for the most part. There are also external causes of circulation obstacles arising from a serious lack of water in practice, there will be a burst pipe.
The induced draft fan baffle removed is equivalent to the full load start with the operation, the export of no baffle to regulate the air volume, the damper has been in the state of maximum air volume. The total air volume is higher than before, and the motor current is also higher.
Burning the furnace is not good, perhaps too much air volume to cause the temperature inside the furnace is not appropriate, the air volume is large to take away the temperature inside the furnace to cause the exhaust temperature increases.
Boiler operation in the induced draft fan current suddenly increased the reason _: Boiler operation in the induced draft fan current suddenly increased the reason: (1) impeller direction installed in reverse is the root cause of the ventilator motor current exceeds the standard tripping. Therefore, in the two-way symmetrical inlet impeller ventilator assembly or overhaul, must pay attention to the installation direction of the impeller and marking, the general impeller are assembled according to the direction of the backward curved type, that is, the back of the blade bow toward the front, concave toward the back, the manufacturer must be installed in the instruction manual has to have a special indication of this. (2) when the fan repeatedly tripped and measured motor running current is normal, should be considered the cause of the failure of electrical components, such as by the thermal relay and other malfunction caused by; assembly fan after the test run, electricians should be on-site to work closely with the detection of the motor to start, run current value is abnormal, so as not to cause loss or complication of the fault. (3) assembly ventilator should pay attention to the installation size, belt tightness and impeller and collector clearance.
Boiler operation of the induced draft fan current suddenly increased causes: current increase, must be an increase in air volume or mechanical part of the failure.
Why is the current of the induced draft fan high? _: Expand 1, overload may be caused by the wind, may also be caused by air duct blockage 2, lack of lubrication rotating parts are not maintained in time, or the environment is too dusty 3, motor internal faults there may be a local short-circuit 4, the motor does not match the motor capacity may be too small
boiler room induced draft fan current suddenly become small what is the reason _: 1, check the fan rotor is balanced, dynamic balancing 2, bearing rotation flexible without wear and tear, well lubricated. 3, pipe diameter is appropriate, too small or air inlet blockage are easy to hold pressure. 4, too many elbow settings, reducing fan efficiency. 5, it is likely that the pipeline is blocked with foreign objects, careful inspection, will be disconnected from a flange interface, try the fan, it is easy to find the problem. Pure hand, please give points.
Boiler induced draft fan in the operation of vibration suddenly rise this is due to what causes? _: induced draft fan sudden vibration has many reasons, if it is a fine noise can be judged as fan bearings or motor bearing clearance is too large, if it is obvious macro-vibration, and is sudden, there may be the following reasons: 1, the ground screws loose. In the event that you can not confirm the tightening of the case; 2, the coupling gap is too large. After stopping the machine, make sure by hand...
What are the reasons for the high current of the induced draft fan? I do not know much about the boiler fan is how to use, but if the current has been determined to be too large, then look at the current may be too large for two reasons, one is too large a load, that is, the damper open too large. The other is the equipment
Reasons for the increase in the starting current of the blower_: Please check 1. voltage problems 2. whether there is a mechanical failure 3. you used to measure the air outlet and now the air outlet measurement is the same
What are the reasons for the high current of the induced draft fan? _: Bearing damage, different centers, the damper opening too large to cause excessive load. Another is the problem of equipment, lubricating oil, motor quality problems, it is best to find a professional check.
Boiler flue resistance increases, the induced draft fan current will increase why? I think the induced draft fan inlet flue gas wind: the fan is equivalent to a water pump, if you do not understand, you can take it as a water pump (a pump air pump). Water pump is easy to understand, increase the flow rate or increase the output head height (increase the output pressure) will increase the load of the pump, that is, increase the motor current. Now the flue resistance increases, the actual air volume reduction is not much, but the back pressure increases a lot, so the motor feels the load increases, resulting in increased current.
15 kilowatts of boiler induced draft fan normal operation of the current is too large motor heating is caused by what _: current may be too large for two reasons, one is too large a load, that is, the damper opening too large. Another is the problem of equipment, lubricants, motor quality problems and so on, it is best to find equipment personnel to view.