Boiler dust collector

Boiler dust collector, refers to the equipment that separates the dust from the flue gas. Boiler dust collector is a common supporting equipment in boiler and industrial production. Its function is to boiler fuel, combustion emissions flue gas particles in the soot to be, thus significantly reducing the amount of soot discharged into the atmosphere, which is environmental pollution, improve air quality important environmental protection equipment.

Flue gas through the flue into the venturi, in the throat of the entrance to the water is uniformly sprayed into the flue gas due to the high-speed movement, so the water sprayed into the flue gas is melted into a fine water mist wet flue gas in the grey material, so that the grey material and water droplets collision cohesion occurs, especially the material diameter of the dust material can be fine water mist water soluble. These are fully prepared for the separation of grey material, thereafter into the cylinder, reduce the temperature of the flue gas continues to impact the pool of lime water, flue gas dust and SO2 and the pool of lime water reaction to generate sulphate, in the inertial force, gravity, adhesion, cohesion, under the action of sinking to the bottom of the water to complete The sub-desulphurisation process, was flue gas stirred up by the water splash, the water mist and the flue gas after washing in the fan under the gravitational pull of the air-water at the same time lifting the open, so that the Flue gas and lime water fully reacted, and then through the impeller dehydrator into the water separation, water through the drain pipe into the pool, and make the flue gas to complete the third dust removal and desulphurisation, purified gas through the fan into the atmosphere.

Boiler dust collector can be divided into: steam dust collector, bag filter, boiler desulphurisation dust collector, vertical kiln bag filter and so on according to different principles.

Vertical kiln bag filter editor

Vertical kiln large bag filter details

Working principle 

(1) Pre-separation: The dusty gas discharged from the kiln enters the inlet pipe in the centre of the dust collector through the flue, and enters into each bag room of the dust collector uniformly above the centre of the dust hopper under the negative pressure produced by the induced draft fan of the dust collector system, and the coarse particles of dust in the dusty flue gas fall into the dust hopper directly due to the obstruction by the deflector plate and the effect of their own gravity to complete the pre-separation of the dust.

(2) Filtration: The dusty gas enters into the filter bag through the holes of the flower plate, the dust is retained on the inner surface of the filter bag, and the dusty gas is filtered and purified by the filter bag, the purified gas enters into the bag room, and then through the lifting and switching valves, the exhaust channel and the outlet pipeline, and is discharged into the atmosphere by the exhaust fan. The dust collector is a top air outlet, negative pressure operation of internal filter dust collector. The dust cleaning method can be divided into two methods: fixed time and fixed resistance. Fixed-time ash cleaning is according to the time procedure, each room according to the adjustable time parameters automatically take turns to clean the ash, dust collector cleaning cycle for 0 ~ 2.5 hours in six adjustable, each room cleaning time for 10 seconds ~ 3 seconds minutes six options. Timed ash cleaning control is to sample the inlet and outlet pressure difference of the dust collector, and convert it into electric signal through differential pressure transmitter to implement ash cleaning, the working process is as follows: Inlet and outlet pressure sampling device Differential Pressure Transmitter Ash Cleaning Controller Relay Solenoid Valve Cylinder Lift Switching Valve In addition to the two control methods mentioned above, there is also a manual control mechanism, which can be manually controlled by the normal ash cleaning. For the convenience of operation and management, it is recommended to adopt the method of cleaning ash at regular intervals. Fourth, temperature control flue gas temperature of vertical kiln generally fluctuates in the range of 60-300 °, flue gas moisture content fluctuates in the range of 4-12%, in order to prevent the dust collector condensation paste bag and due to the high temperature of the occurrence of bag burning and other malicious accidents.

The following measures are taken in the dust collector system:

(a) Insulation measures should be taken in the inlet pipe, body and dust hopper of the dust collector to prevent dew condensation of the dust collector.

(ii) Temperature detection and automatic alarm devices are installed at the air inlet and exhaust of the dust collector, and a cold air entry device is installed at the air inlet. Once the flue gas exceeds the temperature range of the bag dust collector, the alarm will occur and temperature control measures will be taken automatically to prevent the operation of the dust collector.

(iii) Electric heating and vibration devices are installed on the ash hopper to avoid the problem of strong dust accumulation due to low temperature.

The boiler dust collector is suitable for dust removal, smoke elimination and desulphurisation, featuring low resistance, flexible installation and arrangement, desulphurisation and long service life!