Introduction:
Recently, the annual repair project of water treatment in the public auxiliary workshop of a steel plant in Jiangsu, undertaken by Lefilter, has been successfully completed. The project covers 16 self-cleaning filters, 6 inclined plate precipitators, 2 chemical oil remover, 2 sets of shallow sand filters with a flow rate of 400m³/h, 4 sets of Φ3600 quartz sand filters and 1 set of Φ3500 double rotary flow filters, which took more than 30 days to complete.
Project Overview:
Due to the large amount of water used in the process of steelmaking, the inclined plate precipitator, chemical oil removal device, quartz sand filter and other frequent treatment of suspended solids and sludge iron debris in the water treatment equipment, resulting in serious wear and tear in the equipment. The filter cloth, inclined pipe, filter material, filter screen and so on belong to the regular replacement of filter supplies, at the same time has to be replaced, due to the production needs, The Lefilter Company will replace and maintain the filter material and the seriously worn parts of the relevant equipment during the overhaul of the relevant equipment. Specific maintenance is as follows:
Self-cleaning filter maintenance site
16 self-cleaning filter tank seal and filter screen damage lead to substandard filter water quality, rotation shaft bending and brush damage lead to unclean cleaning, sewage pipe obstruction leads to failure to discharge, shaft seal wear leads to equipment leakage, instrument disrepair leads to inaccurate measurement. Replace and clean the brush filter electromagnetic blowdown valve, and replace the drive shaft.
Mounting screen Replace the brush and drive shaft
Clear flange surface sludge Equipment maintenance
Replace solenoid valve Install and debug the motor
Inclined plate precipitator maintains site
The filter cloth inside the 6 inclined plate precipitators is deformed, the surface of the body accumulates ash, and there are more sludge and iron blocks, resulting in the blockage of the lower water outlet, abnormal sound of the shaft head of the mud conveying machine, and water leakage of the disc root.
The press cloth is replaced, the root is repaired, and rust removal and corrosion prevention are carried out in the body to prolong the service life of the equipment.
Remove the old press cloth Inner wall derusting
Remove the old press cloth Inner wall derusting
Inner wall anticorrosion Install the new press cloth
Before comparison After comparison
Chemical oil remover maintenance site
2 chemical oil remover internal packing inclined pipe aging, collapse, blockage, lifting device abnormal sound failure.
The filler is replaced, the internal rust removal and corrosion prevention of the body, and the lifting device is replaced.
Remove old packing Inner wall derusting
Inner wall anticorrosion Install new packing
Before comparison After comparison
Shallow sand filter maintains site
2 groups of flow 400m³/h shallow sand filter inside the filter cap is blocked, the filter material is laminated, the three-way valve is leaking, the electric control cabinet is damaged, and the corrosion is serious.
Clean and replace the filter cap, filter material, three-way valve and electric control cabinet.
Clean up waste Cleaning tank Replace filter cap
New filter material filling Replace the control cabinet and accessories
Before comparison After comparison
Quartz sand filter maintenance site
4 sets of Φ3600 quartz sand filter inside the water distribution device cracking, resulting in sand leakage, filter cap blockage, filter material board, filter material reduction, water quality is poor.
The internal repair welding cracks, replace the filter cap and filter material.
Clean up old packing Replace filter cap
Electric valve replacement Put in new filler
Before comparison After comparison
Double swirl decontaminator maintains the site
A set of Φ3500 double rotation through the filter fiber ball intercepts more sludge, resulting in fiber ball failure, flow becomes smaller, the fiber ball replacement.
Clean up old packing Clean the scrap and plate
New fiber ball filling Remove old valve
Before comparison After comparison
After the above equipment maintenance operations, all the operation debugging, to meet the requirements of use.
Due to the short time required for this annual repair, heavy tasks, many points, wide coverage and large number of operators, the Lifeldt EPC project Department formulated specific measures in the aspects of project safety, civilized construction, field operation, quality process control and limited space operation. Second, it strengthened on-site inspection and carried out high-quality coordination meeting. Make the work schedule controllable, personnel reasonable operation and operation risk source clear, improve 6S fine management, to ensure the smooth progress of overhaul project.
