CNMC type countercurrent pulse back blowing bag filter

The CNMC type counter current pulse back blowing bag filter is composed of a filter bag component, a guide device, a pulse blowing system, an ash discharge system, a control system, an offline protection system, a box, etc.

1. The connection design of the integrated filter bag frame, bag and hanging bag plate adopts a self-locking device, which is easy to install and replace, and can extend the service life of the filter bag. The filter bag adopts polyphenylene sulfide needle punched felt.

2. The diversion device adopts an air inlet method and a designed flue gas distribution device can distribute dust containing gas and separate large-diameter particles to avoid dust containing gas from washing the filter bag, thereby improving the efficiency of the entire dust removal device and the service life of the filter bag.

3. The pulse spraying system consists of a recoil header, electromagnetic pulse valve, pressure bearing joint, nozzle tube, bracket, etc. At the top of each filter bag, there is a compressed air nozzle tube. During operation, each row of filter bags is generally set to pulse back blow to clean the dust once every 10 seconds. The timer starts the solenoid valve once to spray the pulse back blow air into the filter bag for dust cleaning.

4. The control system mainly consists of a pulse injection controller, BMC computer control cabinet, thermal resistance thermometer, static pressure measuring point, material level indicator, and measuring components.

5. The offline protection system is mainly composed of bypass valve, spray cooling system, thermometer, pressure detection device and filter bag leak detection device. Install a thermometer at the inlet of the dust collector. When the flue gas temperature is too high or the boiler tail is reburning, the spray cooling system will be started and the emergency spray water will be used for cooling to avoid burning the filter bag. If the cooling system cannot reduce the flue gas temperature to within the normal operating range of the bag filter within a certain period of time, or if fuel injection is required for boiler ignition and low load combustion assistance, in order to avoid the direct entry of oily flue gas into the dust collector, causing the filter cloth powder layer to harden and affecting the normal operation of the dust collector, the bypass valve should be opened, and the flue gas should be directly discharged through the bypass flue to avoid damaging the filter bag. A filter bag leak detection device is installed in the clean air chamber to promptly alert when the filter bag is damaged.

Working principle of CNMC type countercurrent pulse back blowing bag filter:

The dusty gas enters the filter bag through the inlet and is filtered on the outer surface of the filter bag. The purified gas flows from the inside of the filter bag to the upper chambers and is discharged from the outlet through a long Venturi tube. When the dust adsorbed on the outer surface of the filter bag reaches a certain value, it is controlled by the programmable control system to be sprayed at a scheduled time. That is, high-pressure air is sprayed towards the long Wens tube while the purified gas is blown back into the filter bag, forming a large pressure difference to remove the dust and achieve the purpose of cleaning. The resistance of the entire system is kept stable, and the dust blown back falls to the bottom of the lower box and is discharged and recovered by the screw conveyor.

Equipment features:

1. With few constraints such as environment and temperature, it can work 24/7.

2. This process adopts chamber exhaust and pulse back blowing for dust cleaning.

3. In terms of structure, the small Venturi tube at the top of the spray pipe and filter bag has been removed. The upper box is divided into eighteen small chambers that are not connected to each other and are connected to a long Venturi tube. The purpose of dust cleaning is achieved by using programmable pulses. The blowing airflow is smooth, the physical characteristics are reasonable, the structure is simple, and the operation and maintenance are convenient.

4. There are no rotating parts inside the filter chamber, which improves performance and reduces maintenance difficulty.

5. It is not necessary to enter the filter chamber for the operation of opening and removing the cover, checking and disassembling the filter bag.

6. Separate the flower board edge of the upper middle box and press it into a conical hole to form a smooth contact surface with the filter bag, with good sealing performance, reducing wear between the hole edge and the filter bag, and extending the service life of the filter bag.

7. Adopting external filter dust removal, it is convenient to clean the dust.

8. The equipment has a large air volume, low system resistance, and a wide range of applications (purification and recovery of mixed gases with dust concentration less than 60g/m3 at room temperature and high temperature).

The equipment has a reasonable structure, occupies a small area, and can be installed indoors or outdoors.

10. All have inspection (maintenance) doors for easy operation and maintenance.

11. Large caliber electromagnetic pulse valve, control, strong stability, low failure rate.

12. The pressure of compressed air used for dust cleaning is low and the air consumption is small. Use an independent gas source for gas supply.

13. All instruments and meters are displayed intuitively, centrally controlled by the control cabinet, and easy to operate.

14. All accessories are produced in a standardized manner with strong targeting.

15. The electrical system uses low voltage (24V) control, which is non hazardous.

16. Equipped with temperature monitoring system, over temperature alarm, automatic cooling, and high coefficient.

The main structure of CNMC type countercurrent pulse back blowing bag filter consists of the following four parts:

The upper box is composed of a liftable bag changing door cover, guardrail, flower board, filter bag, long Wen tube, inlet and outlet air channels, and two side air vents.

The lower box is composed of an ash hopper, inspection door, deceleration device, and ash conveying and discharging device.

The spraying system consists of an electromagnetic pulse valve, an air bag, and a protective device.

The control system consists of a pulse controller and an electrical control cabinet.