Replacement of the rotor in southern cement factory for ATOX50

Summary:

Nanfang Cement Hunan factory (customer) Atox50 raw material grinding powder separator LVT-52.5 cage rotor replacement project was constructed on site by Nanjing Powertech Company and provided replacement spare parts and on-site technical services.

Construction time: 7 days

Construction staff: 20 people

Construction crane: 200 tons

1. Construction personnel enter the site

According to the relevant procedures such as the normal entry construction requirements of a factory of Southern Cement Hunan, the safety training of the construction personnel is carried out and the two parties sign the on-site construction safety agreement. The personnel put on labor protection equipment and enter the construction site to work.

2. The old rotor of the powder concentrator is disassembled and lifted out

1. Handle related shutdown and power-off procedures. Because it is a high-altitude operation, the work surface scaffold must be constructed first, and the flange bolts of the air outlet pipe of the powder separator and the gas cutting and separation of the air pipe shall be carried out successively;

2. At the same time, disengage the old cage rotor of the powder separator from the main shaft. Use 4 5 hand chain hoists to fix the rotor symmetrically at four points, remove the 4 fixed support rods of the powder separator, and loosen the bolts of the locking plate at the lower part of the main shaft. Disconnect the rotor from the main shaft, and use a chain hoist to lower the rotor on the ash hopper;

3. Remove the connecting parts of the drive part of the powder separator and the flange bolts of the upper shell, and then use a 50t car crane to lift the drive reducer, motor and support as a whole to the ground;

4. Use a truck crane to hoist the main shaft of the powder concentrator and lay it flat on the ground, waiting to be disassembled to replace the bearing, sealing and other construction operations;

选粉机出口风管法兰拆卸及管路气割

选粉机驱动装置拆除

选粉机减速机、电机和主轴的拆卸并吊出

5. Due to site space constraints, a 300t truck crane needs to be used to park at a long distance, and the outlet duct of the powder separator, the upper cover shell and the old cage rotor are respectively lifted out and placed on the ground;

出口风管吊出

选粉机旧转子和顶盖吊出

3. Installation of the new cage rotor of the powder concentrator

转子联接法兰盘组件拆卸、安装

新笼形转子吊装入磨

选粉机顶盖吊装就位

选粉机出风管吊装就位

3. The main shaft of the powder separator is disassembled and all lubricating oil lines are cleaned to ensure smooth flow of all oil lines;

  4. Use oil bath to heat the bearings to replace the powder separator bearings, skeleton oil seals and oil seal bushings;

5. The main shaft of the powder concentrator is hoisted in place and connected with the new cage rotor, and the locking plate bolts are tightened according to the standard torque of 490Nm;

  6. Due to the deformation and sinking of the top cover shell of the powder concentrator, it is necessary to restore the deformation of the top cover shell, repair welding, support reinforcement, spindle pad height, leveling adjustment, and fixation;

顶盖变形下沉

调整前转子下沉过大

顶盖变形调整，支撑、固定

主轴垂直度找正并支撑固定

主轴垫高及壳体修复

    7、adjust the gap of Seals

Four, commissioning test and approval 

1. Clean and evacuate the powder concentrator. According to the procedure, power the powder concentrator into a single-unit no-load test machine. Carry out a 30%, 60%, and 80% speed test operation for more than half an hour to ensure that the seal is not scratched. The host current, vibration and temperature rise are all normal;

  2. Carry out relevant on-site acceptance and signing procedures in accordance with the customer’s construction acceptance standards, ensure that the completion site is clear, and go through the evacuation procedures of construction personnel and maintenance tools.

撰稿人：工程部 — 曹道兵