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Fault analysis of dust collector of 30 ton circulating fluidized bed boiler in thermal power plant

  • Publisher: Yan Wenhua

    Release date: September 4, 2020
  • Thermal power plant thirty Ton circulating fluidized bed Boiler dust collector fault analysis

      Bag filter is used in circulating fluidized bed boiler to remove dust from flue gas. During the initial operation of boiler, bag filter is often ignored when there is no problem. It is not considered as an important system, and daily inspection and maintenance are not carried out. The small problems were not handled in time, which eventually led to dust collector failure and shutdown, resulting in huge economic losses to the factory production. Bag leakage is common, which affects the dust removal efficiency of the dust collector, seriously abrades the impeller and volute of the induced draft fan, and causes environmental pollution around. Therefore, it is an important work to do well in the operation and maintenance of the boiler system dust remover, especially the later operation maintenance and management, and improve the dust removal efficiency.

    Bag filter for boiler The structure and working principle of

    Pulse bag filter is mainly composed of upper box, middle box (filter bag and framework installed inside), ash hopper, ash cleaning mechanism, ash unloading device, control system, etc. The dust containing gas enters from the lower part of the middle box and rises evenly through the deflector to the filter bag. The large particle dust first falls into the ash hopper after collision, and the dust is blocked on the outer surface of the filter bag. The clean gas enters the bag, passes through the bag mouth and the upper box, and is discharged by the air outlet pipe. With the continuous increase of dust on the outer surface of the filter bag, when the resistance of the equipment reaches the set value, the differential pressure monitoring system sends a signal, and the ash cleaning mechanism starts to work. The compressed air is ejected from the pulse valve, and is injected into the filter bag through the spray pipe and nozzle. The filter bag expands and vibrates instantaneously, so that the dust on the surface falls out and falls into the ash hopper and is discharged by the ash unloading valve. It can also be used to clean the dust regularly or manually. Each chamber of the pulse bag filter is cleaned in turn, and the chamber that completes the dust removal will resume the dust removal state.

    Thermal power plant thirty Fault analysis of dust catcher of 1 ton circulating fluidized bed boiler

    Bag filter for boiler Operation precautions

    one )Through the on-line value of smoke detection meter, the operation condition of filter bag should be paid attention to frequently and carefully to judge whether the bag has leakage.

    two )During the start-up of the unit, the flue gas temperature shall not be higher than that of acid 10℃ The above and boiler combustion oil stage must not make flue gas pass through the filter bag. At this time, the bypass baffle valve should be opened and the inlet and outlet baffle should be closed.

    three )If the flue gas temperature is higher than 160℃ Switch to bypass immediately to protect the filter bag. Higher than 160℃ Operation under the condition will reduce the service life of the bag.

    four )The dust accumulation in the dust hopper of the bag filter should not be too much. If the dust is too much, it is easy to bury the bag, which will cause the bag pressure difference to rise and increase the treatment of the induced draft fan. Ensure the normal operation of ash conveying system.

    Installation points of bag filter for boiler

    Gravity subsidence —— When the dust containing gas enters the bag filter, the dust with large particle size and large ratio will settle under the action of gravity, which is the same as that of the settling chamber.

    Sieve filtration —— When the particle diameter of the dust is larger than the gap between the fibers of the filter material or the gap between the dust on the filter material, the dust will be retained when the air flow passes through, which is called screening effect. When the dust accumulated on the filter material increases, the effect is more significant.

    Inertial force action —— When the air flows through the filter material, it can pass around the fiber, and the larger dust particles zai Under the action of inertial force, it still moves in the original direction, so it collides with the filter material and is captured.

    Thermal movement —— Light and small dust (1 Below micron ) It is very close to the airflow streamline and can bypass the fiber. But they are subject to thermal motion ( The Brownian movement ) After the collision of gas molecules, the original direction of movement will be changed, which increases the contact between dust and fiber, so that dust can be captured. When the diameter of the filter material fiber is smaller, the porosity is smaller and the capture rate is higher, so it is more conducive to dust removal.

    Thermal power plant thirty Fault analysis of dust catcher of 1 ton circulating fluidized bed boiler

    circulating fluidized bed boiler Bag filter Working process of

    In the combustion system of a coal-fired circulating fluidized bed boiler, the fuel coal is first processed into a wide screen coal within a certain particle size range, and then it is sent to the dense phase area of the circulating fluidized bed by the feeder through the coal feeding port for combustion. Many fine particles will enter the dilute phase area for continuous combustion, and some of them will fly out of the furnace with the flue gas. Most of the fine particles flying out of the furnace are separated by the solid material separator and sent back to the furnace chamber through the return feeder to participate in combustion. A large number of high-temperature flue gas generated in the combustion process flows through the superheater, reheater, economizer, air preheater and other heating surfaces, enters the dust collector for dust removal, and is discharged to the chimney by the induced draft fan and enters the atmosphere.

    Hebei Shouyang environmental protection equipment Co., Ltd. has been committed to the research, development, installation and production of environmental protection dust removal, waste gas deodorization, desulfurization and denitration engineering equipment for many years, mainly including boiler dust collector, bag filter, filter cartridge dust collector, cyclone dust collector, wet electrostatic precipitator, electrostatic precipitator and waste gas deodorization purifier. At the same time, our company produces dust collector bag and dust collector The framework, pulse solenoid valve, pulse controller, unloader, gate valve, conveyor, elevator and other dust removal accessories, high-tech engineering personnel and excellent production and installation team cooperate with each other sincerely, and are highly praised by the industry and customers,


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