Resistance reduction optimization of non-standard pipes at the air outlet of ATOX50 vertical mill cyclone dust collector
Publishdate：2021-05-05 Views：430
Abstract: In December 2020, our company replaced the cage rotor, ash hopper and related accessories of the ATOX50 raw material vertical mill separator of a cement company, and made corresponding improvements and optimizations. The mill production rate was 5% Lifting, the mill runs stably.
Number of construction workers: 5
Construction period: 7 days
Construction crane: 75 tons
1. Working conditions before optimization
The company's ATOX50 raw meal mill system cyclone dust collector is matched with 4 ∅5.6m cyclones for the collection of raw meal products.
The cyclone dust collector has the following two problems:
1. The negative pressure at the outlet of the cyclone cylinder of the system is to -10.3kPa at the inlet pressure of the circulating fan, and the separation efficiency is low and the resistance is large.
Central control screen before transformation
2. The negative pressure of the non-standard pipe at the outlet of the cyclone dust collector is not balanced. Due to the inconsistent position and distance of the left and right cyclones, the original design of the pipe arrangement results in uneven distribution of the outlet pipe and the cyclone closer to the circulating fan. The resistance of the pipe at the air outlet of the tube is small; on the contrary, the resistance of the pipe at the air outlet of the cyclone is higher, and the air inlet of the cyclone has a lot of material accumulation, which causes the system to pull the wind not smoothly.
There is a lot of material accumulation at the air inlet of the cyclone that is far from the circulating fan
2、the optimization plan
According to the calibrated site conditions, our company decided to optimize the layout of the non-standard pipe structure of the cyclone outlet to reduce the outlet resistance caused by the unreasonable installation of the original design and the uneven distribution of the outlet airflow.
Remove the original non-standard pipe at the air outlet of the cyclone, and replace it with a new non-standard pipe at the air outlet of the cyclone. The two pipes at the left and right cyclone outlet are converged on the middle pipe at the same time to ensure that the airflow of the two pipes rises evenly. , And then merge into the main duct of the air inlet of the circulating fan. The wind pipe at the air outlet of the cyclone is changed into a structure form of a shrimp tube. The diameter of the pipe is enlarged, the ventilation section is enlarged, and the resistance of the pipe is reduced.
In order to solve the problem of material accumulation in the horizontal pipe connected in the middle of the cyclone, an ash hopper chute is opened in the lower part of the horizontal pipe and connected to the cone of the cyclone, so that the accumulated raw meal powder directly enters the cone of the cyclone and is collected. The following figure shows the drawing design and three-dimensional model.
Design drawings
3D model
3、the construction process
1. Removal of non-standard pipes: set up scaffolding, cut the non-standard pipes at the air outlet in sections, retain the original cyclone, and use a crane to lift the cut pipes to the ground.
Non-standard pipeline removal
2. Non-standard pipeline production: In the production site, the non-standard pipeline is made by cutting, stakeout, rolling, and welding, and assembled in sections to facilitate subsequent overall hoisting.
Non-standard pipeline production
3. Installation of non-standard pipes: After the pipes are finished, they should be hoisted, installed, welded and fixed in sections, and then externally insulated.
Non-standard pipeline installation
4、optimize the effect
After optimizing the structure of the non-standard pipe at the outlet of the cyclone dust collector, the pressure difference of the vertical mill system is reduced, the resistance of the cyclone outlet is reduced by about 1500-2000Pa, the collection efficiency of the cyclone is improved, and the work efficiency of the vertical mill circulation fan is improved.
Written by: Engineering Technology Department
Abstract: In December 2020, our company replaced the cage rotor, ash hopper and related accessories of the ATOX50 raw material vertical mill separator of a cement company, and made corresponding improvements and optimizations. The mill production rate was 5% Lifting, the mill runs stably.
Number of construction workers: 5
Construction period: 7 days
Construction crane: 75 tons
1. Working conditions before optimization
The company's ATOX50 raw meal mill system cyclone dust collector is matched with 4 ∅5.6m cyclones for the collection of raw meal products.
The cyclone dust collector has the following two problems:
1. The negative pressure at the outlet of the cyclone cylinder of the system is to -10.3kPa at the inlet pressure of the circulating fan, and the separation efficiency is low and the resistance is large.
Central control screen before transformation
2. The negative pressure of the non-standard pipe at the outlet of the cyclone dust collector is not balanced. Due to the inconsistent position and distance of the left and right cyclones, the original design of the pipe arrangement results in uneven distribution of the outlet pipe and the cyclone closer to the circulating fan. The resistance of the pipe at the air outlet of the tube is small; on the contrary, the resistance of the pipe at the air outlet of the cyclone is higher, and the air inlet of the cyclone has a lot of material accumulation, which causes the system to pull the wind not smoothly.
There is a lot of material accumulation at the air inlet of the cyclone that is far from the circulating fan
2、the optimization plan
According to the calibrated site conditions, our company decided to optimize the layout of the non-standard pipe structure of the cyclone outlet to reduce the outlet resistance caused by the unreasonable installation of the original design and the uneven distribution of the outlet airflow.
Remove the original non-standard pipe at the air outlet of the cyclone, and replace it with a new non-standard pipe at the air outlet of the cyclone. The two pipes at the left and right cyclone outlet are converged on the middle pipe at the same time to ensure that the airflow of the two pipes rises evenly. , And then merge into the main duct of the air inlet of the circulating fan. The wind pipe at the air outlet of the cyclone is changed into a structure form of a shrimp tube. The diameter of the pipe is enlarged, the ventilation section is enlarged, and the resistance of the pipe is reduced.
In order to solve the problem of material accumulation in the horizontal pipe connected in the middle of the cyclone, an ash hopper chute is opened in the lower part of the horizontal pipe and connected to the cone of the cyclone, so that the accumulated raw meal powder directly enters the cone of the cyclone and is collected. The following figure shows the drawing design and three-dimensional model.
Design drawings
3D model
3、the construction process
1. Removal of non-standard pipes: set up scaffolding, cut the non-standard pipes at the air outlet in sections, retain the original cyclone, and use a crane to lift the cut pipes to the ground.
Non-standard pipeline removal
2. Non-standard pipeline production: In the production site, the non-standard pipeline is made by cutting, stakeout, rolling, and welding, and assembled in sections to facilitate subsequent overall hoisting.
Non-standard pipeline production
3. Installation of non-standard pipes: After the pipes are finished, they should be hoisted, installed, welded and fixed in sections, and then externally insulated.
Non-standard pipeline installation
4、optimize the effect
After optimizing the structure of the non-standard pipe at the outlet of the cyclone dust collector, the pressure difference of the vertical mill system is reduced, the resistance of the cyclone outlet is reduced by about 1500-2000Pa, the collection efficiency of the cyclone is improved, and the work efficiency of the vertical mill circulation fan is improved.
Written by: Engineering Technology Department
