The 75T boiler dust collector is designed by Huiyang Company, a specialized service manufacturer, with excellent dust removal effect, ultra-low emissions, and stable working performance, which has been highly praised by customers! Manager Mu

Technical characteristics of using LCMD pulse bag filter for 75T boiler dust collector

1. This dust collector adopts the technology of segmented air stop pulse blowing for dust cleaning, overcoming the shortcomings of conventional pulse dust collectors and segmented back blowing dust collectors. It has good dust cleaning ability, good dust removal efficiency, low emission concentration, low air leakage rate, low energy consumption, low steel consumption, small footprint, stable and excellent operation, and good economic benefits. It is suitable for the purification of dusty gases and material recovery in metallurgy, building materials, cement, machinery, chemical, power, and light industry industries.

2. Due to the use of segmented air stop pulse spraying for dust cleaning, the cleaning cycle is extended and the energy consumption for dust cleaning is reduced, resulting in a significant decrease in compressed air consumption. At the same time, the fatigue level of the filter bag and pulse valve is correspondingly reduced, thereby doubling the service life of the filter bag and valve plate.

3. The maintenance and bag replacement can be carried out in separate rooms without stopping the system fan and under normal operating conditions of the system. The filter bag mouth adopts an elastic expansion ring, which has strong sealing and excellent firmness. The filter bag keel adopts a polygonal shape, reducing friction between the bag and the keel, extending the life of the bag, and facilitating bag unloading.

4. Adopting the upper bag extraction method, after extracting the skeleton during bag replacement, the dirty bags are put into the lower ash hopper of the box and removed from the manhole. The actual effect is mainly based on the operating conditions for bag replacement.

5. The box adopts an airtight design, with good sealing performance. The inspection door uses excellent sealing materials, and the air leakage rate is very low.

6. The layout of the inlet and outlet channels is compact, with low airflow resistance.

7. The dust collector is equipped with insulation devices to prevent condensation of flue gas at low temperatures.

Technical Description of LCMD Pulse Bag Dust Collector Used for 75T Boiler Dust Collector

1、 Steel structure

Buildings above zero meters of dust collectors are all made of steel structures, and the steel structural components comply with relevant steel structure design specifications; The design of steel structures simplifies on-site installation steps and minimizes on-site welding processes as much as possible. As for the steel structure of the dust collector, the supporting structure is self-supporting, and no horizontal load is transferred to other structures.

2、 Body and ash hopper

1. The top cover of the dust collector adopts a shear punch sealed top cover, which is suitable for manual opening in terms of weight and size. After the production and assembly of all holes and doors are completed, a sealing test shall be conducted to confirm that there is no deformation or leakage.

2. The ash hopper of the dust collector can withstand long-term temperature, humidity changes, and vibrations, while considering stable performance.

3. The dust collector ash hopper is equipped with maintenance doors, and all maintenance doors and manhole doors are quick opening, which can be opened flexibly and sealed tightly. To avoid smoke short circuiting and carrying ash, the angle between the inclined side wall of the ash hopper and the horizontal direction should be greater than 60 ° to protect the free flow of ash.

4. The ash hopper is equipped with an anti arch device to prevent the formation of ash plates. Each ash hopper can withstand an additional load of 18000kg and has a designed storage capacity that meets the required storage capacity for 16 hours of full load operation with a high dust content.

3、 Flower board, filter bag, skeleton

The holes of the cloth bag flower board are smooth and free of burrs. The surface deformation of the flower board is small, and the flatness deviation is less than 1/1000. The center deviation of the flower board hole is less than 0.01mm, the aperture deviation is ≤ 0.01mm, and the net spacing of the flower board hole is ≤ 215mm. The filter bag is fixed on the flower board by the elastic expansion ring sewn on the bag mouth, and the bag mouth adopts a self-locking sealing device to confirm no leakage and easy disassembly and assembly; The filter bag skeleton is supported on the flower board without a compression device, making it easy to remove the frame and replace the filter bag.

4、 Air intake system

Airflow Uniform Distribution Technology

In terms of the impact on dust removal efficiency, the uniformity of airflow distribution inside the dust collector has a significant influence on the dust removal efficiency of the electrostatic precipitator. The impact on bag filters is relatively limited, but if the local wind speed is too high, it will have a significant impact on the lifespan of the filter bags in these areas. This will result in a lower lifespan of the filter bag. Therefore, the airflow distribution technology inside the bag filter is one of the key technologies of the bag filter. In engineering practice, although there are currently no relevant standards in this area, it is generally required that the uniformity be greater than 90%. For high air volume dust removal, due to the large amount of flue gas, the distribution of airflow is even more important and difficult. Currently, the gap between bag dust removal technology in China and developed countries is that uniform airflow technology is a major aspect. The airflow distribution inside the bag filter is related to the intake and exhaust methods, the structural layout of the filter, and the uniform flow measures taken.

1. Air intake method, air volume distribution, and airflow distribution

The resistance of bag filters is composed of both filter bag filtration resistance and equipment resistance. We have conducted important research on how to reduce the structural resistance of bag filters. From the basic conditions for reducing aerodynamic resistance, it can be known that when the gas flow is smooth, gentle, the process is short, and no vortices occur, the flow resistance will decrease. By applying this principle, as long as the flue gas enters the bag filter through the gradually expanding inlet and is evenly distributed, filtered, and then discharged through the outlet, it is very beneficial to reduce the structural resistance of the bag filter. So we invented the straight in and straight out air inlet and outlet method, which strives to meet the basic conditions of low resistance flow in structural design. The major advantages of this air intake method for dust collectors are short process, smooth airflow, low speed, and low equipment structural resistance.

2. Set up air volume adjustment deflectors and porous airflow distribution plates, organize and guide the airflow into the predetermined space, evenly deliver and distribute the air volume to each filter bag compartment, confirm that the filter material is not washed away or damaged, and meet the requirements of protecting its long life. Compare the results of computer simulation experiments and laboratory simulation experiments to determine the optimal device form for air volume distribution and airflow distribution parameters. And make adjustments and corrections through on-site testing.

3. After being distributed and rectified by the airflow distribution device, the flue gas flows towards the filtering space of the bag filter. The flue gas is filtered through external filtration, and coarse dust mainly falls into the ash hopper by gravity and inertial collision. The capture of fine dust mainly relies on screening and filtering. The dust is trapped on the outer surface of the filter bag, and the purified flue gas flows well along the inside of the bag. After collecting in the upper box, it flows from the tail outlet to the induced draft fan.

4. The dusty gas enters each unit filtration chamber through a guide pipe. Due to the design, there is sufficient and reasonable clearance between the bottom of the bag and the upper opening of the air inlet, and the spacing between the filter bags is specially designed. After the airflow is guided through the front, it is naturally distributed based on the principle of resistance distribution, achieving uniform distribution of airflow and resistance in the entire filtration chamber, protecting the reasonable smoke lifting speed, minimizing turbulence, and preventing secondary dust to the greatest extent possible.

5. The customized air inlet guide system of the dust collector reduces the resistance of the box, filter chamber, and system to a minimum and minimizes the dust settling phenomenon in the air inlet system, avoiding the shaking, collision, and friction of the filter bag, and extending the service life of the system and filter bag.

Our company has improved the air distribution system of this type of dust collector with the help of computer model data. The uniform porous airflow air distribution system greatly reduces turbulence, prevents secondary dust, and protects the dust containing gas from being evenly distributed to every part of the compartment section after being guided through the air distribution system.

5、 Ash cleaning system

1. Including clean air pipes, compressed air pipes, pulse valves, etc., the clean air pipes are arranged in parallel in the pre assembled top clean air chamber. Each clean air pipe has several small jet nozzles, which correspond to the center point of each filter bag.

2. Pulse jet cleaning technology

Pulse valves and blowing devices are key factors in determining the effectiveness of dust cleaning and reducing operational resistance.

6、 Filtering system

Including filter bags, bag cages, flower boards, etc., each filter bag is placed on a bag cage to prevent the bag from being crushed. Flower boards are used to support filter bag components, separate bag chambers and clean air chambers, and serve as maintenance platforms for dust filter system components.

7、 Electromagnetic pulse valve

1. The key equipment of the dust cleaning system is the electromagnetic pulse valve, and its selection is related to the cost and cleaning effect of the dust collector.

2. The electromagnetic pulse valve we selected for the low-pressure dust collector is a 3 "submerged pulse valve with excellent membrane quality and a lifespan of over 1.5 million cycles, which meets the operational requirements of the pulse electromagnetic valve and greatly reduces maintenance workload.

8、 Railings, stair platforms, and rain shelters

We have configured the necessary escalators and platforms for equipment and instruments to meet the needs of operation, maintenance, and overhaul.

9、 Control system

The control system includes instruments, meters, PLC programmable controller as the main body of the dust collector main control cabinet and corresponding auxiliary facilities, adopting continuous control mode to meet the needs of equipment self control and workshop (or intermediate) control.

10、 Equipment manufacturing process

1. The dust collector housing is sealed and rainproof, and the housing design should avoid dead corners or dust accumulation areas as much as possible. All heated components should fully consider thermal expansion and make necessary compensation.

2. After the formation of the dust collector box, it is smooth and flat without obvious unevenness. The internal reinforcement plate is arranged reasonably to protect the strength and rigidity of the box. The dust collector body is designed to be sealed and firm, and the dimensional fitting tolerance of the connecting parts meets the standard tolerance and the 10th level precision specified in the fitting.

3. The production of dust collector wall panels requires flatness and no distortion, with a diagonal error of less than 5mm. Components that deform during transportation must be straightened.

4. All continuous welds of the dust collector are straight, without welding defects such as virtual welding or false welding, and are welded using automatic welding to ensure that the strength and sealing of the welding meet the corresponding industry standards. After welding, the weld seam should be cleaned of welding slag and spatter. It is not allowed to apply primer immediately after removing obvious welding slag, spatter, and rust powder. Use a handheld grinder to grind the welds and splashes in key areas.