After being crushed in the crushing station, the raw coal directly enters the coal preparation plant workshop. After a series of treatments such as screening, crushing, jigging, and heavy medium, it enters the product workshop. As the main transportation tool, the belt will generate a large amount of dust and breathable dust in the screening and crushing workshop, which seriously affects the working environment of workers and even poses a threat to their lives. In order to achieve zero pollution in the environment, only dust collectors can be used for treatment.
Due to the fact that the dust collector in the coal preparation plant is a key equipment in the dust removal system, its working condition directly affects the success or failure of the entire system. Therefore, every aspect of the design, manufacturing, installation, commissioning, and operation of the dust collector needs to be carefully arranged.
Design scheme for dust treatment of dust collector crushing and screening in coal preparation plant
1. Design of dust collection hood
1.1 Crusher: Designed with a semi sealed cover
1.2 Belt Conveyor: Both the head and tail are designed with semi sealed covers
1.3 Vibration Screen: The dust volume in the vibration screen material trough is large, so a top sealed dust hood is installed above the vibration screen material trough, which is located above the material trough.
2. Working conditions
Dust generating equipment: crusher, drum screen
Temperature: Normal temperature
Dust: coal powder dust
2.2 Air volume distribution:
1. Sealed chamber of drum screen
Vacuum hood size: according to the original top vacuum hood size.
The wind speed of the gap in the sealed chamber of the drum screen is 1.0m/s,
Design air volume: 6000 m3/h,
2. 1 # crusher on the west side of the drum screen
Vacuum hood size: Raise and extend the original vacuum hood, and add a soft leather curtain at the belt feeding port to seal it.
Two CPF900 * 900 impact hammer crushers with a designed air volume of 12000 m3/h.
3. 2 # crusher on the west side of the drum screen
Vacuum hood size: Raise and extend the original vacuum hood, and add a soft leather curtain at the belt feeding port to seal it.
2 # Two PCFX900 hammer type counterattack fine crushing design air volume: 12000 m3/h,
4.1 # and 2 # crushers in the lower ash conveying gallery
Seal the east and west sides of the lower ash conveying gallery of crusher 1 # and crusher 2 #, and install a dust collection hood in the middle of the ash conveying gallery. The existing gas collection hood can be retained for use..
Air volume in the ash conveying corridor: 5000 m3/h,
According to the requirements of on-site production equipment, the above four dust points will be treated using a bag filter. The total designed air volume is 35000 m3/h, with an additional 1.1 times, resulting in a total air volume of 38500 m3/h.
5. North side of drum screen 3 # CP110 * 100 hammer crusher
Vacuum hood size: Raise and extend the original vacuum hood, add a soft leather curtain at the belt feeding port to seal it, seal the front and rear of the unloading conveyor channel at the bottom of the crusher, and keep the original vacuum hood.
The design air volume of the 3 # CP110 * 100 hammer crusher is 8000-10000 m3/h. A separate 7.5KW bag filter is designed here for dust collection.
The proposal and corresponding equipment for the screening and crushing workshop are key measures for dust control in coal preparation plants. Currently, it is believed that the basic control policy for the dust workshop has not changed and still follows comprehensive control measures such as "blocking, lowering, flushing, removing, and discharging".