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author：fly boy 2019-10-28
MW unit equipment maintenance program hunan huadian changde power generation co., LTD. Boiler burner preparation:
Preliminary review: review: review: approved:
Equipment maintenance procedure of hunan huadian changde power generation co., LTD.
The first edition
Equipment name burner equipment number maintenance plan equipment maintenance category □ overhaul □ minor overhaul □
Other planning work
Time month day year to year month day
Actual working hours: from dd to dd
A, major overhaul project number burner overhaul standard project main points project check the pulverized coal nozzle and nozzle and shading of the nozzle baffle overhaul and replacement of secondary air damper equipment nozzle tilting mechanism overhaul and pendulum Angle calibration plasma ignition burner wind-box overhaul maintenance condition before repairing the dangerous point source control goal after overhaul: see the burner maintenance operation risk analysis and control table (appendix a) whether organizational learning construction permit to party a to party b all equipment designed work crews, head of special projects department, director of the division into the security department, director of the dedicated security department director sighed
2. Operation conditions: confirm that the maintenance work order has been issued correctly and cooperate with operation personnel to check on site that all the safety measures have been implemented correctly. Both parties shall sign on the work order before starting work.The person in charge of the work has given a detailed explanation to all the staff: work tasks, safety precautions, quality requirements of the maintenance project, maintenance period and other related matters.Have prepared necessary maintenance tools, measuring instruments, etc.Spare parts and materials have been prepared and tested.Bring "maintenance documentation package" ready to accept the quality supervision of equipment management personnel or acceptance personnel at any time.
Party a: party b: director of equipment department, director of equipment department, director of security department, director of security department, director of technology department, director of project department, director of project department
4. Model and specification number of special tools and tools commonly used model and specification number of tools and tools model and specification number of tools and tools
Spare parts and materials spare parts name, model, specification, part number, quantity remark, material name, model, specification, part number, quantity remark
Six, maintenance process overview: the combustion equipment adopts the medium speed coal mill, the primary cooling fan, the positive pressure direct blowing pulverization system to design the pulverized coal burner for the four-angle layout, tangential combustion, oscillating burner.The burner is equipped with six layers of pulverized coal nozzle boiler configuration platform MP medium speed coal grinder. The outlet of each mill is connected by four pulverized coal tubes to the same layer of pulverized coal nozzle boiler BMCR and BRL at the four corners of the furnace.The combustion mode adopts advanced composite air classification low NOx combustion system.By analyzing the NOx generation mechanism during pulverized coal combustion, the main task of a low-nox pulverized coal combustion system is to reduce volatile nitrogen and convert it into NOx.In order to reduce NOx emission, the stable combustion capacity and combustion efficiency of boiler without supporting combustion and under low load should be improved.The continuous updating of technology also has a unique effect on preventing slagging in furnace, high temperature corrosion and reducing smoke temperature deviation at furnace outlet.
The main bellows are provided with a layer of strengthened pulverized coal nozzle and fuel wind (circumjacent wind) is arranged around the pulverized coal nozzle.A layer of auxiliary air nozzles is arranged between the pulverized coal nozzles of each adjacent layer, including a DAP nozzle with upper and lower bias and a direct air nozzle only.In the main bellows upper layer with the nerazzurri (UAGP Ⅰ and UAGP Ⅱ) nozzle is equipped with the layer at the bottom of the main bellows end nerazzurri (AA) layer wind nozzle.The upper part of the main bellows is arranged with two stages of separation burnout wind (BAGP low burnout wind and UAGP high burnout wind) burner including a common layer of separation burnout wind nozzle that can swing horizontally.The secondary air baffle actuators are operated separately by the pneumatic actuators, together with the peripheral air of the pulverized coal nozzle, each corner of the main burner and the exhaust air burner.In order to meet the requirements of boiler steam temperature regulation, the main burner nozzle adopts a swing structure consisting of internal and external connecting rods and a swing system which is driven up and down by a pneumatic actuator.Exhaust air burners are also driven up and down by a pneumatic actuator.The pneumatic actuators adopt imported straight stroke structure, which is characterized by compact structure, simple control and can adapt to frequent adjustment.There is no oil gun in the secondary air chamber of the burner. The oil-free ignition mode A and B are plasma ignition burners.
Pulverized coal burner design parameter name number serial number unit single nozzle heat input x KJh secondary wind speed ms secondary air rate low burning wind high burning wind Zhou Jiefeng secondary air temperature ℃ a wind speed ms a wind rate of wind temperature ℃ burner once the wind resistance of Pa Pa adjacent pulverized coal burner secondary air resistance nozzle center distance mm design parameters of the plasma ignition device serial number name unit model parameters of the generator power available to the adjusting range is kW ~ can replace the service life of the cathode anode life h h p p cold start stable ignition time S < plasma arc pull of propellant gas pressure kPa ~ single plasma generator N gas consumptionMh cooling water pressure MPa ~ single plasma generator cooling water flow th load current operating range ADC ~ arc voltage operating range VDC ~ single plasma generator weight kg.
Inspection of process nozzle:
Check the burning loss of the first and second air nozzle and make a detailed record.
Before checking the nozzle, the coking and ash should be cleaned inside the nozzle and the nozzle mouth.
Check the wear and crack of the surface of the primary air nozzle and the weld of the structural parts.
Check the diffuser cone of the primary air nozzle and the coal dust separation separator and its location.
Check the wear of the pulverized coal nozzle at the inlet of the primary air nozzle.
Check appearance of secondary air nozzle.
The primary air nozzle is replaced as the main correction auxiliary secondary air nozzle is replaced as the main correction auxiliary correction when the steel electrode should be used correctly.When the local wear and tear area of coal dust separation baffle and coal dust nozzle is small, it should be replaced when the wear area of welding or cutting is large.Repair and replace the connecting bolt of the gate door of the coal powder tube with the fixed bolt of steel wire rope before removing the bolt, lift the gate off and then remove the elbow or straight pipe of the coal powder tube in front of the gate and lift off.Remove the inner and outer guard of the burner, adjust the nozzle of the burner to a horizontal position to fix the swinging main connecting rod, remove the connecting pin of the crank and adjusting connecting rod, and then remove the adjusting connecting rod of the nozzle swinging.Use a wire rope to pull the nozzle together with the primary air nozzle out of the burner box for inspection.Note: the distance between the nozzle surface and the inner guard plate should be measured and recorded before nozzle extraction.Before disassembly of shade separation baffle, apply the polishing machine to grind away the fixed pin weld and mark the disassembly mark before disassembly.Before the installation of the nozzle, check the external dimension of the nozzle and the smoothness of the weld surface of the mechanism. For the secondary air nozzle, check the deflection Angle.Check the distance between the two support plates when installing the pulverized coal nozzle.The pin shall be fixed and welded immediately after the baffle is fixed and the nozzle is connected with the nozzle.Before the nozzle and nozzle into the burner box, the connecting rod and crank as well as the fulcrum pin shaft should be adjusted to make it flexible.Clean the thread and lubricate the connection bolt between the gate and nozzle before installation.
Calibrate the profile and flatness of the secondary air baffle at each Angle.Check whether the flexible switch of secondary air baffle is in place and whether the actual opening degree of the baffle is consistent with the local indication.Check the connection and fixation of baffle and shaft.(W) technical record card maintenance and swing Angle check of process nozzle swing mechanism (open bellows to check the connecting rod, crank, shaft, etc.Repair minor deformation serious replacement.Correct the swing parts are flexible and free from jamming.Check gaskets, pins, rings, spring pads, etc. for any damage or loss and replace them promptly.Check and repair the connecting rod, shaft locating pin and u-shaped clamp to ensure that they are in good condition.Open each hole door of the side screen of the air chamber of the bellows of the burner and check whether there is deformation, bending, serious rust, loosening or falling off of bolts and other defects of the nozzle bearing, shaft seat, shaft pin and the fastening bolt blocked by the pin shaft, internal horizontal and vertical swing connecting rod and crank.Swing the nozzles at each corner with the hand hoist to observe the up and down swing of the nozzles. Adjust the nut of the connecting rod to make the nozzle swing synchronously.The adjusting nut of the adjusting nozzle adjusting mechanism measures the perpendicularity of each nozzle plane to position the nozzle horizontally.Swing the nozzle to the maximum elevation Angle and the maximum inclination Angle to measure the maximum elevation Angle and the maximum inclination Angle of the nozzle.According to the actual position of the nozzle check and calibration nozzle swing Angle local indication.Check whether the holes and doors of the air chamber on the front and side of the bellows are deformed or damaged. Repair or replace the missing bolts according to the situation.Check the connection of the bellows and the water-cooled wall with the big flange, screw loose and expansion.Check bidirectional corrugated expansion joints for deformation, damage, and solder joints for defects and repair as appropriate.Check insulation of each part.Check the bearing, steel beam and Angle steel.
Power failure: disconnect the manual power switch of the plasma dc cabinet and hang the work plate of "no closing when someone is working".Clean up the sundries and dust on the trolley bracket and generator cover.Remove seal ring and remove packing.Pull the generator out of the maintenance position and prop it up with the spiral elevator.Close the main inlet and outlet doors of the generator and open the drainage valve to drain the water.(disassembly, assembly and protection of anode body) according to the above steps of "generator integral disassembly", withdraw the generator from the burner to check the anode ablation and determine whether replacement is needed according to the ablation.)According to the record inspection time, and the running time, make a certain prediction of the service time of the anode in continuous use.Remove the anode body that needs to be replaced.A first clean up the dust at the front of the anode.B remove the fastening bolt with M hexagon wrench (special tool for anode).C. During disassembly, please do not knock, touch or fall the anode to protect the sealing groove.Check anode body gasket (no. 1 gasket) for damage.Measure gasket thickness.Anode body reassembly.A. Check whether the spare bolt (high strength M×) and spring pad are in good condition; clean up the anode sealing groove and sealing surface of the body to ensure the sealing effect of the sealing pad.B. Tighten with inner hexagon wrench (special tool for anode) in diagonal circulation for several times to avoid deviation of pressure.Tightening force: nim (operator holds the end of the wrench to tighten the wrench (lever) slightly bent.C pay attention to the diaphragm direction when assembling the anode body and body.Hydrostatic test: close the drainage valve and open the inlet and outlet valve to check whether the sealing surface is leaking.Remove the generator from the burner according to the above steps of "overall removal and maintenance of the generator". Remove the anode according to the above steps of "removal and maintenance of the anode body".Check the cathode ablation to determine whether replacement is needed according to the ablation.Cathode disassembly: remove the cathode from the body with a hole hook wrench (cathode special tool).Install the new cathode: a assemble the new cathode: check, no. O ring should be in good condition when installing the assembly of no. O ring and no. O ring, a little grease should be applied on the O ring.B. Apply a little conductive paste at the front ~ buckle of the cathode to be flush with the tip of the silk tooth.C reload cathode with hole hook wrench: note that the o-ring should not be damaged during reloading.
Name of nonconforming item
I. fact description of nonconforming items: equipment maintenance department personnel (acceptance personnel) signature: date:
2. Suggested corrective measures: equipment maintenance department personnel (acceptance personnel) signature: date:
3. Completion of corrective measures: signature of maintenance supervisor: date:
Four, acceptance of corrective action: equipment maintenance department staff (al) signature: date: the quality standard for concession application, approval for huadian changde in hunan power generation co., LTD. Quality standard concession for application and approval paper edition: the first device name VRDS centrifugal fan report number: quality standard concession project name
I. reasons why the maintenance project fails to meet the quality standard
Two, request compromise project overhaul quality standard application overhaul unit technical responsible person signature: date:
Review opinions of chief engineer of maintenance unit
Review opinions of personnel of equipment maintenance department signature of personnel of equipment maintenance department (or quality acceptance) date:
Company chief engineer signature: date: completion report hunan huadian changde power generation co., LTD
I. maintenance plan equipment maintenance type □ major repair □ minor repair □ other planned working hours dd/year to dd/year actual working hours dd/year to dd/year
Ii. Main work in maintenance
Main defects found and eliminated in maintenance
4. Prepare change or improvement report and drawing modification
The project sets H points and W points.H points and W points qualified for acceptance, among which H points and W points for rework.
Vi. Defects and reasons that have not been eliminated hunan huadian changde power generation co., LTD
Name, specification, model, actual consumption price remarks date of the person in charge of the work