Chain boilers, coal-fired boilers, circulating fluidized bed boilers, and other boilers generate a large amount of smoke and dust during the production process, requiring dust removal and desulfurization treatment. Botou Huiyang Company is committed to researching the dust removal and desulfurization of boilers, We have rich production experience, mature technology, and equipment operation in the dust removal of boilers ranging from 0.5T to 260T.

Structural characteristics of chain boiler dust collector

1. Box body: composed of upper box body (clean air chamber), middle box body (filter chamber), lower box body (ash hopper), flue gas distributor, flower board, platform, escalator, support foot, air inlet, ash outlet, insulation, colored panel, etc.
2. Filter bag assembly: The connection design of the filter bag frame, bag and hanging bag adopts a self-locking device, which is easy to install and replace, and can extend the service life of the filter bag. The specifications of the filter bag are: φ 130x6000mm, φ 160x6000mm, and φ 160x7000mm, using polyphenylene sulfide needle punched felt (PPS/PPS504CSl7, treated).
3. Diversion device: Adopting the upper air inlet method, the designed flue gas distribution device can not only distribute dust containing gas, but also separate large particles to avoid dust containing gas flushing the filter bag, further improving efficiency and extending the service life of the filter bag.
4. Pulse spraying system: composed of recoil box, electromagnetic pulse valve, pressure joint, nozzle tube, bracket, etc. Specifications below HGDM-5.6 are for whole box cleaning, while other specifications have a compressed air nozzle tube at the top of each filter bag. During operation, it is generally set that each row of filter bags should be pulse blown back to clean the dust every 10 seconds, and the solenoid valve should be started at a regular time to inject pulse blown compressed air into the filter bags for dust cleaning.
5. Ash removal system: composed of an electric vibrator (air cannon), an electric heater, and an ash level indicator. The dust generated by the electric vibrator (air cannon) has good fluidity.
6. Control system: mainly composed of pulse injection control instrument, PLC computer control cabinet, thermal resistance thermometer, static pressure measuring point, material level indicator and measuring components.
7. Offline protection system: mainly composed of bypass valve, differential pressure device, level gauge, thermometer, pressure detection device, pulse controller, filter bag leak detection device, etc. Spray water when the flue gas temperature is too high or the boiler tail reignites to prevent damage to the filter bag. A filter bag leak detection device composed of differential pressure gauges and other components is installed in the clean air chamber to promptly alert when the filter bag is damaged. Due to the need to spray fuel during ignition and low load of large tonnage boilers, a large amount of oily gas will be generated. This flue gas will directly enter the dust collector, causing the filter bag powder layer to harden, resulting in system resistance and affecting normal operation. The system adds a bypass pipeline to allow the oil containing gas to be discharged through the bypass pipeline at the moment of fuel injection, thereby protecting the filter bag.

The desulfurization process of chain boiler dust collector

The desulfurization process is divided into two stages, namely spray section desulfurization and cyclone plate desulfurization. In the spray section, the desulfurizer is sprayed at high speed through the nozzle and fully contacts with the flue gas to undergo mass transfer reaction. Due to the different flow rates of the flue gas and the desulfurizer after spray atomization, the surface contact between the two substances is intensified, which improves the desulfurization efficiency. However, due to the relatively small internal passage of the spray section, the desulfurization efficiency is limited (about 25%), and the main desulfurization process is still completed in the cyclone plate tower.

The main tower is equipped with a swirl tray, which belongs to the jet type tray and has multiple inclined blades. The airflow spirals upwards through each tower plate (in the direction of blade rotation), and the liquid flows from the blind plate to each blade to form a thin liquid layer. At the same time, it is rotated and sprayed into droplets by the airflow, and under centrifugal force, it reaches the tower wall to form a liquid ring that rotates along the wall. It then flows down to the lower blind plate through the liquid lowering device. Due to the droplet like high-speed flow of liquid through the airflow, the fluid dynamics factors have been improved, enhancing the equipment's throughput and interfacial contact conditions. At the same time, the thermodynamic factors between the gas-liquid phases have been fully utilized, improving the mass transfer efficiency of the equipment. Achieve the purpose of desulfurization.