1. Dust collector clogging Because the amount of ash carried by the flue gas greatly exceeds the design value, a large amount of dust particles are attached to the cloth bag. Cloth bag dust collector is blocked for a long time, which increases the bag end difference, especially when the ash content and humidity are high.
2. When the injection pressure starts the injection, a large pressure is generated in the bag. When the bag of the dust collector is tightly wrapped by ash and the pressure cannot be discharged, it will have repeated impacts on the bag. When the bag cannot withstand the impact Torn.
3. High exhaust temperature The exhaust temperature is 150 ℃ for a long time. This temperature exacerbates the embrittlement effect of the gas on the bag and is also a cause of damage to the bag.
4. Corncob's viscosity Corncob contains a large amount of sugar. At higher temperatures, ash particles with large viscosity adhere to the cloth bag, which is not easy to fall under the action of blowing, which is also the reason for the tearing of the bag. It is also prone to spontaneous combustion and burn the cloth.
5. Inflation air source Bags must use a medical compressed air source for injection. The moisture and ash in the miscellaneous air source are combined to easily stick to the cloth bag.
Third, the solution
(1) Replace the damaged cloth bag.
(2) After replacing the cloth bag, strengthen the lower ash room to put ash, and no clogging should occur.
(3) To shorten the injection time and the fixed value of the injection pressure difference, it is better to start injection at 1200Pa and stop at 800Pa.
(4) Adjust the combustion, reduce the flow rate of flue gas, and reduce the amount of ash carried by flue gas.
(5) Fuel blending to reduce fuel ash content and viscosity in ash.
(6) The ash discharge of the pre-dust collector must be unblocked to reduce the amount of ash carried by the flue gas entering the ash room bag.
(7) Add a set of pre-duster mechanical ash discharge device.
Due to the large domestic fuel ash content, the design of the pre-duster and bag duster of the biomass boiler are too small. Therefore, the maintenance of the duster must be strengthened to prevent clogging.
In order to achieve the effect of environmental protection, the biomass boiler is equipped with a dust collector in the flue at the rear of the boiler to ensure that the smoke emission meets the environmental protection requirements.
When the bag of the dust collector can't consider the smoke and separate the dust particles. What should I do if the dusty flue gas escapes from the crack and is discharged from the chimney through the induced draft fan, ash is emitted, and the discharge of the dust collector is not up to the standard?
1. Biomass boiler bag loses ash filtering effect
Due to the damage of the dust bag and the reduction of the resistance of the dust collector, the pressure difference between the front and back of the dust collector is changed. The flue gas passes freely through the opening of the bag, and a large negative pressure is formed in the dust bin. The flow velocity is greater than the unit mass of the dust particles. So that the ash particles can not fall into the ash bin, but under the action of the air flow, without leaving the separation effect of the bag, they leave the dust collector chamber.
2. The amount of ash carried by the flue gas increases. Because the filter bag does not work, the ash particles are mixed with the flue gas flow through the gap of the crack of the bag, and quickly leave the dust collector. A large amount of dusty flue gas passes through the induced draft fan, which aggravates the impeller wear and reduces the service life of the induced draft fan. Ash particles are discharged from the chimney and pollute the environment.
3. Changed the flue gas flow rate. The flue gas passing through the torn bag and the reduction of the flue gas resistance will change the combustion status of the biomass boiler. The velocity of the flue gas in front of the bag is accelerated, which causes the flame to move up and the burning time is not enough. It is usually manifested by the increase of the incomplete combustion products in the second return of the superheater.
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