Maintenance Cycle and Standard Maintenance Specifications of Calcium hydroxide equipment

　　Calcium hydroxide equipment is the core complete set of facilities in the deep processing of slaked lime,environmental protection desulfurization and lime preparation for sewage treatment.It mainly consists of crushing,conveying,maturation,screening,dust removal,electric control and other systems.Operating continuously under harsh conditions with heavy dust and high humidity for a long time,the equipment is prone to scaling,wear,dust accumulation,bearing aging and seal failure.The decreased production capacity,unstable fineness of finished products,frequent equipment failures and unplanned downtime on many production lines are mostly caused by non-standard maintenance and unclear maintenance cycles.Establishing a reasonable maintenance cycle and implementing the standardized system of daily inspection,weekly maintenance,monthly maintenance,quarterly inspection and annual inspection are essential to ensure stable operation of the production line,extend equipment service life and cut production costs.

　　1.Daily Maintenance:Daily Inspection to Guarantee Basic Operating Condition

　　Daily maintenance is the foundation of equipment upkeep for Calcium hydroxide equipment,and routine inspections before startup and after shutdown must be carried out every day,which serves as the first line of defense against sudden failures.Most calcium hydroxide production lines run 24 hours a day.Due to heavy dust and complex working conditions of hydration reaction,daily patrol inspection can detect potential hidden dangers in a timely manner.The key points of daily maintenance include equipment surface cleaning,abnormal operating noise,temperature,sealing performance and pipeline leakage,as well as the status of the electric control system.Before startup,inspect feeding equipment,screw conveyors and main maturation unit for material blockage and jamming,and confirm there is no leakage in water pipelines and sealing components.During operation,keep a close watch on abnormal vibration,noise and temperature.After shutdown,promptly clean dust,residual slurry and agglomerated materials on the equipment surface to prevent hardened materials from corroding the equipment shell and blocking pipelines.Meanwhile,check the air pressure and fan operation of the dust removal system every day to ensure efficient dust collection and avoid heat accumulation caused by excessive dust.

　　2.Weekly Maintenance:Fastening and Commissioning to Eliminate Minor Wear Risks

　　A comprehensive inspection and maintenance shall be conducted once a week for Calcium hydroxide equipment,focusing on commissioning and fastening of transmission components,connecting structures and vulnerable parts.Tighten bolts,flanges and couplings across the whole equipment to solve loose screws and offset seals resulted from long-term vibration.Refill lubricant and adjust tension for bearings,reducers,transmission chains and belts,and check their wear conditions to ensure stable operation of the transmission system.In addition,clean blocked materials on screen meshes and surface dust on dust removal filter elements every week.Inspect the wear of stirring paddles in the maturation system and remove scaling inside the cavity regularly,so as to avoid uneven maturation and reduced output caused by thickened scaling.Regular weekly maintenance prevents minor faults from evolving into major breakdowns and maintains stable operating accuracy of the equipment.

　　3.Monthly Maintenance:In-depth Lubrication to Optimize Operating Performance

　　Carry out in-depth maintenance for the entire production line of Calcium hydroxide equipment once a month,with focus on comprehensive inspection of the lubrication system,sealing system and power system.Firstly,fully replace and replenish lubricating grease for all bearings,reducers and rotating parts,and discard deteriorated and turbid lubricants to prevent severe wear caused by dry friction.Check operating parameters of water pumps,fans and motors,monitor whether current and temperature stay within the standard range,and troubleshoot aging circuits and dust accumulated on terminal blocks.Secondly,give priority to inspecting the water-lime ratio device,temperature control system and liquid level sensors of the calcium hydroxide maturation system,and calibrate instrument data to realize precise control over maturation temperature and water addition ratio,so as to guarantee the activity and purity of finished calcium hydroxide.Moreover,examine sealing gaskets,dust-proof sleeves and pipeline seals,and replace slightly aged and worn accessories in advance to eliminate material leakage,water seepage and dust emission.

　　4.Quarterly Maintenance:Overall Inspection and Replacement of Vulnerable Parts

　　Shut down the equipment for a systematic overall inspection once every quarter,and thoroughly check and replace high-wear vulnerable components.In long-term contact with lime powder and alkaline slurry,stirring blades,liners,screen meshes,screw blades and dust removal filter bags are easily worn out.During quarterly maintenance,inspect their wear degree strictly,and replace severely worn,deformed or damaged parts timely to prevent substandard fineness of finished products and production capacity decline.Meanwhile,check the integrity of anti-corrosion and wear-resistant layers inside the maturation unit cavity,and repair peeled and worn areas to protect the equipment shell from corrosion.Thoroughly remove scaling in water pipelines and circulation systems to avoid pipeline blockage which affects the hydration reaction effect.Quarterly maintenance helps restore production capacity,stabilize product quality and extend the overall service life of the equipment.

　　5.Annual Maintenance:Overhaul and Calibration to Fully Restore Operating Performance

　　Complete a full overhaul of the entire production line once a year,which is the highest-level maintenance work.The whole line needs to be shut down for disassembly inspection,precision calibration and batch replacement of aged components.Focus on overhauling core parts of the main transmission system,main shafts,bearing seats and reducer units to rectify operating deviation.Fully test the electric control system,sensors and automatic control system,and calibrate all operating parameters to ensure accurate and stable automatic control.In addition,conduct rust removal,anti-corrosion treatment and reinforcement for equipment frames,shells and foundations to solve structural fatigue and position offset after long-term operation.Annual overhaul can completely eliminate potential faults of the equipment,restore the production line to its optimal operating state,and support stable and high-yield production in the coming year.

　　6.Significance of Standardized Maintenance Cycles

　　Operating under severe working conditions for continuous production,Calcium hydroxide equipment will suffer from declining output,unstable product quality,surging failure rate and increased maintenance costs if maintenance work is neglected.Strictly implementing the standardized maintenance schedule including daily inspection,weekly maintenance,monthly maintenance,quarterly inspection and annual overhaul can greatly reduce unplanned downtime and maintenance costs.It also keeps stable maturation precision,product fineness and activity indicators,thus enhancing market competitiveness of products.Standardized periodic maintenance is the core guarantee for long-term stable production,energy conservation,consumption reduction and service life extension of calcium hydroxide production lines.