Installation and maintenance method of generator sealing tile

Abstract

The invention relates to an installation and maintenance method of a generator sealing pad. The method comprises the following steps: S1, preparation work; s2, dismounting a generator excitation end small end cover and a # 10-watt upper tile fixing bolt; s3, dismounting an excitation end sealing tile upper shell fixing bolt mounting blocking plate; s4, the upper shell and the lower shell of the sealing tile are detached; s5, checking the condition of the sealing tile; s6, checking and cleaning are conducted before reinstallation, and then a lower sealing tile shell and an upper sealing tile shell are installed in sequence; s7, stamping to 50kPa in the engine, putting into a sealing oil system, and boosting to carry out an air tightness test; and S8, other parts of the sealing tile are installed again and checked, and a small end cover can be buckled after confirmation. According to the method, the clear steps ensure that maintenance and installation work are executed according to high standards each time, risks caused by inconsistent operation are reduced, meanwhile, the steps are optimized, unnecessary downtime is reduced, the whole maintenance period is shortened, and production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of generators, and in particular relates to a method for installing and repairing a sealing shoe of a generator. Background Art

[0002] The sealing pads of thermal power plant generators often fail, and maintenance is usually carried out during the unit overhaul, which requires the unit to be shut down. Since the turbine cylinder temperature needs to be reduced to 150°C, it usually takes 15 days of shutdown to be carried out. The time is long, resulting in the loss of the capacity and electricity compensation price of the thermal power unit. The earlier the maintenance time, the faster the maintenance speed, and the higher the efficiency of the power plant, so it is necessary to install and repair the sealing pads in a shorter time. Summary of the invention

[0003] (I) Purpose of the invention

[0004] In order to overcome the above shortcomings, the purpose of the present invention is to provide a method for installing and repairing a generator sealing shoe to solve the above technical problems.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] A method for installing and repairing a generator sealing shoe comprises the following steps:

[0008] S1 preparation work, complete the gas replacement of the generator, maintain the pressure inside the generator at about 50kPa, quickly switch the oil system, stop the turning machine and pump, reverse the filter screen and resume turning operation;

[0009] S2 removes the small end cover of the generator excitation end and the fixing bolts of the upper #10 tile. When the lifting conditions are met, the turning gear is stopped, the #10 tile is lifted open, and measures are taken to prevent the lower tile from rotating before resuming the turning gear.

[0010] S3 Remove the fixing bolts of the upper shell of the excitation end sealing shoe, reduce the pressure inside the generator to 50kPa, close the lubricating oil system and install the plugging plate;

[0011] S4 removes the upper and lower shells of the sealing shoe;

[0012] S5 Check the sealing tile condition;

[0013] Before reinstalling S6, check and clean it, and then install the lower sealing shoe shell and the upper sealing shoe shell in sequence;

[0014] The internal pressure of the S7 engine is pressed to 50kPa, the sealing oil system is put into use, and the pressure is increased to conduct an airtightness test;

[0015] S8 Reinstall other parts of the sealing tile and check them. After confirming that they are correct, you can buckle the small end cover.

[0016] Preferably, S1 specifically includes: the temperature of the inner wall of the regulating stage of the turbine body drops to below 400°C, the sealing oil system is switched to the self-circulation mode before shutting down the main oil system, the cranking is briefly stopped, the time should be controlled within 20 minutes, the top shaft oil pump is shut down, the TOP oil pump is shut down, the #10 bearing lubricating oil inlet filter is reversely installed to cut off the oil inlet of the #10 bearing, and then the cranking operation is resumed, and the sealing oil system is switched to the normal mode.

[0017] Preferably, S3 specifically includes: closing the main engine lubricating oil inlet valve to the sealing oil vacuum box, the sealing oil vacuum box oil replenishing valve, shutting down the sealing oil system, installing a plugging plate on the sealing oil inlet pipeline at the excitation end, and after the plugging plate is installed, switching the sealing oil system to the main engine lubricating oil source for operation, and opening the float box bypass door.

[0018] Preferably, the removal of the upper shell of the sealing shoe in S4 specifically includes: after the upper shell of the excitation end sealing shoe is ready for lifting, the turning vehicle is briefly stopped for 30 minutes, the upper shell of the excitation end sealing shoe is removed and lifted out, and then the turning vehicle is resumed to operate, and the lower shell of the excitation end sealing shoe is temporarily oiled.

[0019] Preferably, the removal of the sealing shoe lower shell in S4 specifically includes: stopping the turning car, the top shaft oil pump, the top shoe, disassembling the #10 shoe top shaft oil pipe, turning the #10 shoe lower shoe 90°, removing half of the sealing shoe lower shell fixing bolts, turning the #10 shoe lower shoe 90° in the opposite direction, removing the other half of the sealing shoe lower shell fixing bolts, unscrewing the sealing shoe lower shell, restoring the #10 shoe lower shoe, restoring the top shaft oil pipe, loosening the top shoe device, starting the A top shaft oil pump, and throwing the turning car.

[0020] Preferably, the S5 specifically includes: checking the inner oil baffle, the journal, measuring the clearance data of the sealing pad, grinding and adjusting.

[0021] Preferably, before reinstalling S6, the sealing oil inlet should be checked to confirm that it is unobstructed, clean and free of foreign matter. The reinstallation process is strictly carried out in accordance with the maintenance regulations. The turntable is stopped, the A jack oil pump is installed, the bearing is lifted, and the #10 bearing lower bearing is unscrewed and cleaned.

[0022] Preferably, in the S6, the installed lower sealing shoe housing is screwed in, the installation position of the lower sealing shoe is adjusted, the joint surface bolts are tightened, the insulation is measured and qualified, the upper sealing shoe is reinstalled, the insulation is measured and qualified, the sealing shoe bolt anti-loosening wire is installed, the #10 shoe lower shoe is restored, the top shaft oil pipe is restored, the top shoe device is loosened, the A top shaft oil pump is started, the turntable is turned, the sealing oil is briefly stopped, and the plug installed on the excitation end sealing oil inlet pipeline is removed. Since the sealing shoe recovery time is long, it is performed in two times.

[0023] Preferably, the other components of the reinstalled sealing tile in S8 specifically include:

[0024] Reinstall the #10 bearing upper bearing, reinstall the small end cover, reinstall the external oil baffle, close the main engine lubricating oil to sealing oil manual door, switch the sealing oil system to the self-circulation mode, and restore the #10 bearing lubricating oil inlet filter to normal. It takes 6 minutes. After the work is completed, start TOP immediately. There is no obvious change in the temperature of each bearing. Open the main engine lubricating oil to sealing oil manual door, and switch the sealing oil system to normal operation mode;

[0025] The inspection mainly includes: before fastening the small end cover of the generator, check the cleanliness of the bearing seat to confirm that it is clean and free of foreign matter; check and confirm the installation of the top shaft oil pipe to confirm that it is firmly installed and not loose; check the insulation of the sealing bush and the bearing bush to confirm that the insulation is good; confirm that the thermal and electrical work is completed; the small end cover can be fastened only after the above inspection and confirmation work is completed.

[0026] Preferably, when controlling the pressure in the engine, a control algorithm is used whose working steps include:

[0027] Step 1: Collect system pressure data in real time through sensors;

[0028] Step 2 processes the collected data;

[0029] Step 3: Pressure detection, comparing the monitored pressure data with the preset target pressure value in real time;

[0030] Step 4: Control decision. Based on the pressure monitoring results, the algorithm decides whether the pressure needs to be adjusted. If the current pressure is higher or lower than the target value, the algorithm will calculate the necessary adjustment amount.

[0031] Step 5: Perform adjustments by controlling valves, pumps, or other actuators to increase or decrease pressure to return the system pressure to the target range;

[0032] The following is the basic formula of the algorithm:

[0033]

[0034] in:

[0035] u(t) is the output of the controller at time t;

[0036] K p , K i , K d They are proportional, integral, and derivative gains, which determine how strongly the controller responds to deviations;

[0037] e(t) is the deviation, i.e., the difference between the target pressure and the actual pressure;

[0038] ∫e(t)dt is the integral of the deviation and is used to eliminate steady-state errors;

[0039] It is the rate of change of the deviation, which is used to predict the future trend of the deviation and thus achieve advance control.

[0040] Beneficial effects:

[0041] The clear steps of the present invention ensure that each maintenance and installation work is performed according to high standards, reducing the risks caused by inconsistent operations. At the same time, the steps are optimized, unnecessary downtime is reduced, the entire maintenance cycle is shortened, and production efficiency is improved. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0043] The present invention provides a method for installing and repairing a generator sealing shoe, which comprises:

[0044] S1 preparation work, generator gas replacement is completed, the pressure inside the machine is maintained at about 50kPa, and the sealing pads are inspected in the hot state of the turbine. The cranking downtime and lubricating oil downtime should be shortened as much as possible. The inner wall temperature of the turbine body regulating stage drops to below 400℃, and the temperature should be as low as possible. Before stopping the main oil system, the sealing oil system is poured into the self-circulation mode, and the cranking is briefly stopped, the time is controlled within 20 minutes, the top shaft oil pump is stopped, the TOP oil pump is stopped, the #10 bearing lubricating oil inlet filter is reversed, and the #10 bearing oil inlet is cut off, and then the cranking operation is resumed, and the sealing oil system is poured into the normal mode.

[0045] S2 removes the small end cover of the generator excitation end, takes measures to prevent oil leakage, and then lifts the small end cover to the maintenance site. Remove the fixing bolts of the #10 upper tile. When the lifting conditions are met, contact the operation and stop turning. At this time, do not stop the oil. After lifting the upper tile, take measures to prevent the lower tile from rotating and resume turning.

[0046] S3 removes the fixing bolts of the upper shell of the excitation end sealing pad; at the same time, reduce the pressure inside the generator to 50kPa, close the main engine lubricating oil inlet valve to the sealing oil vacuum box, the sealing oil vacuum box oil replenishing valve, shut down the sealing oil system, and install a plugging plate on the sealing oil inlet pipeline at the excitation end. After the plugging plate is installed, switch the sealing oil system to the main engine lubricating oil source and open the float box bypass door.

[0047] After the upper shell of the S4 excitation end sealing pad is ready for lifting, the turning machine is briefly stopped within 30 minutes, the upper shell of the excitation end sealing pad is removed and lifted out, and then the turning machine is resumed. Temporarily oil the lower shell of the excitation end sealing pad. Stop the turning machine, top shaft oil pump, top pad, disassemble the #10 pad top shaft oil pipe, flip the #10 pad lower pad 90°, remove half of the sealing pad lower shell fixing bolts, flip the #10 pad lower pad 90° in the opposite direction, and remove the other half of the sealing pad lower shell fixing bolts. Unscrew the sealing pad lower shell. Restore the #10 pad lower pad, restore the top shaft oil pipe, loosen the top pad device, start the A top shaft oil pump, and put the turning machine in. This process should be carried out continuously and the time should be shortened as much as possible.

[0048] S5 Check the condition of the sealing pad; check the inner oil baffle and the journal. Measure, grind and adjust the clearance of the sealing pad.

[0049] Before reinstalling S6, check and confirm that the sealing oil inlet is unobstructed, clean and free of foreign matter. The reinstallation process must be carried out strictly in accordance with the maintenance regulations. Stop the turntable, A top shaft oil pump, top bearing, and unscrew the #10 bearing lower bearing for cleaning. Screw in the installed lower sealing bearing housing, adjust the installation position of the lower sealing bearing, tighten the joint surface bolts, and measure the insulation to ensure it is qualified. Reinstall the upper sealing bearing and measure the insulation to ensure it is qualified. Install the sealing bearing bolt anti-loosening wire, restore the #10 bearing lower bearing, restore the top shaft oil pipe, loosen the top bearing device, start the A top shaft oil pump, and put the turntable in place. Stop the sealing oil briefly and remove the plug installed on the excitation end sealing oil inlet pipe. Because the sealing bearing recovery time is long, it is carried out in two steps.

[0050] After the S7 sealing shoe is finished working, the machine is pressurized to 50kPa, the sealing oil system is put into operation, and the pressure is increased to conduct an air tightness test.

[0051] S8 reinstalled the #10 bearing upper bearing, reinstalled the small end cover, and reinstalled the external oil baffle. Close the main engine lubricating oil to sealing oil manual door, switch the sealing oil system to self-circulation mode, and restore the #10 bearing lubricating oil inlet filter to normal, which took 6 minutes. Immediately after the work was completed, TOP was started, and there was no obvious change in the temperature of each bearing. Open the main engine lubricating oil to sealing oil manual door, and switch the sealing oil system to normal operation.

[0052] After the sealing pads and bearings are reinstalled, the cleanliness of the bearing seat should be checked before the small end cover of the generator is installed to confirm that it is clean and free of foreign matter; the installation of the top shaft oil pipe should be checked and confirmed to confirm that it is firmly installed and not loose; the insulation of the sealing pads and bearings should be tested to confirm that the insulation is good; and the thermal and electrical work should be completed; the small end cover can be installed only after the above inspection and confirmation work is completed.

[0053] When controlling the pressure in the engine, the control algorithm used includes the following steps:

[0054] Step 1: Collect system pressure data in real time through sensors;

[0055] Step 2 processes the collected data;

[0056] Step 3: Pressure detection, comparing the monitored pressure data with the preset target pressure value in real time;

[0057] Step 4: Control decision. Based on the pressure monitoring results, the algorithm decides whether the pressure needs to be adjusted. If the current pressure is higher or lower than the target value, the algorithm will calculate the necessary adjustment amount.

[0058] Step 5: Perform adjustments by controlling valves, pumps, or other actuators to increase or decrease pressure to return the system pressure to the target range;

[0059] The following is the basic formula of the algorithm:

[0060]

[0061] in:

[0062] u(t) is the output of the controller at time t;

[0063] K p , K i , K d They are proportional, integral, and derivative gains, which determine how strongly the controller responds to deviations;

[0064] e(t) is the deviation, i.e., the difference between the target pressure and the actual pressure;

[0065] ∫e(t)dt is the integral of the deviation and is used to eliminate steady-state errors;

[0066] It is the rate of change of the deviation, which is used to predict the future trend of the deviation and thus achieve advance control.

[0067] The clear steps of the present invention ensure that each maintenance and installation work is performed according to high standards, reducing the risks caused by inconsistent operations. At the same time, the steps are optimized, unnecessary downtime is reduced, the entire maintenance cycle is shortened, and production efficiency is improved.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing and repairing a generator sealing shoe, characterized in that: The following steps are involved: S1 preparation work, complete the gas replacement of the generator, maintain the pressure inside the generator at about 50kPa, quickly switch the oil system, stop the turning machine and pump, reverse the filter screen and resume turning operation; S2 removes the small end cover of the generator excitation end and the fixing bolts of the upper #10 tile. When the lifting conditions are met, the turning gear is stopped, the #10 tile is lifted open, and measures are taken to prevent the lower tile from rotating before resuming the turning gear. S3 Remove the fixing bolts of the upper shell of the excitation end sealing shoe, reduce the pressure inside the generator to 50kPa, close the lubricating oil system and install the plugging plate; S4 removes the upper and lower shells of the sealing shoe; S5 Check the sealing tile condition; Before reinstalling S6, check and clean it, and then install the lower sealing shoe shell and the upper sealing shoe shell in sequence; The internal pressure of the S7 engine is pressed to 50kPa, the sealing oil system is put into use, and the pressure is increased to conduct an airtightness test; S8 Reinstall other parts of the sealing tile and check them. After confirming that they are correct, you can buckle the small end cover.

2. A method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The S1 specifically includes that the inner wall temperature of the regulating stage of the turbine body drops below 400°C, the sealing oil system is switched to the self-circulation mode before shutting down the main oil system, the cranking is briefly stopped for a period of less than 20 minutes, the top shaft oil pump is shut down, the TOP oil pump is shut down, the #10 bearing lubricating oil inlet filter is reversely installed to cut off the oil inlet to the #10 bearing, and then the cranking operation is resumed, and the sealing oil system is switched to the normal mode.

3. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The S3 specifically includes: closing the main engine lubricating oil inlet valve to the sealing oil vacuum box, the sealing oil vacuum box oil replenishing valve, shutting down the sealing oil system, installing a plugging plate on the sealing oil inlet pipeline at the excitation end, switching the sealing oil system to the main engine lubricating oil source after the plugging plate is installed, and opening the float box bypass door.

4. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The removal of the upper shell of the sealing shoe in S4 specifically includes: after the upper shell of the excitation end sealing shoe is ready for lifting, the turning machine is briefly stopped, and the stopping time is controlled within 30 minutes. The upper shell of the excitation end sealing shoe is removed and lifted out, and then the turning machine operation is resumed, and the lower shell of the excitation end sealing shoe is temporarily oiled.

5. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The removal of the sealing bearing lower shell in S4 specifically includes: stopping the turning car, the jacking oil pump, the jacking bearing, disassembling the #10 bearing jacking oil pipe, turning the #10 bearing lower bearing 90°, removing half of the sealing bearing lower shell fixing bolts, turning the #10 bearing lower bearing 90° in the opposite direction, removing the other half of the sealing bearing lower shell fixing bolts, unscrewing the sealing bearing lower shell, restoring the #10 bearing lower bearing, restoring the jacking oil pipe, loosening the jacking bearing device, starting the A jacking oil pump, and throwing the turning car.

6. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The S5 specifically includes: checking the inner oil baffle, the journal, measuring the clearance data of the sealing pad, grinding and adjusting.

7. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: Before reinstalling S6, check and confirm that the sealing oil inlet is unobstructed, clean and free of foreign matter. The reinstallation process is strictly carried out in accordance with the maintenance procedures. Stop the turntable, A jack oil pump, jack bearing, and unscrew the lower bearing of #10 bearing and clean it.

8. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: In the S6, the installed lower sealing shoe shell is screwed in, the installation position of the lower sealing shoe is adjusted, the joint surface bolts are tightened, the insulation is measured and qualified, the upper sealing shoe is reinstalled, the insulation is measured and qualified, the sealing shoe bolt anti-loosening wire is installed, the #10 shoe lower shoe is restored, the top shaft oil pipe is restored, the top shoe device is loosened, the A top shaft oil pump is started, the turntable is put into operation, the sealing oil is briefly stopped, and the plug installed on the excitation end sealing oil inlet pipeline is removed. Because the sealing shoe recovery time is long, it is carried out in two times.

9. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: The other parts of the reinstalled sealing tile in S8 specifically include: Reinstall the #10 bearing upper bearing, reinstall the small end cover, reinstall the external oil baffle, close the main engine lubricating oil to sealing oil manual door, switch the sealing oil system to the self-circulation mode, and restore the #10 bearing lubricating oil inlet filter to normal. It takes 6 minutes. After the work is completed, start TOP immediately. There is no obvious change in the temperature of each bearing. Open the main engine lubricating oil to sealing oil manual door, and switch the sealing oil system to normal operation mode; The inspection mainly includes: before fastening the small end cover of the generator, check the cleanliness of the bearing seat to confirm that it is clean and free of foreign matter; check and confirm the installation of the top shaft oil pipe to confirm that it is firmly installed and not loose; check the insulation of the sealing bush and the bearing bush to confirm that the insulation is good; confirm that the thermal and electrical work is completed; the small end cover can be fastened only after the above inspection and confirmation work is completed.

10. The method for installing and repairing a generator sealing shoe according to claim 1, characterized in that: When controlling the pressure in the engine, the control algorithm used includes the following steps: Step 1: Collect system pressure data in real time through sensors; Step 2 processes the collected data; Step 3: Pressure detection, comparing the monitored pressure data with the preset target pressure value in real time; Step 4: Control decision. Based on the pressure monitoring results, the algorithm decides whether the pressure needs to be adjusted. If the current pressure is higher or lower than the target value, the algorithm will calculate the necessary adjustment amount. Step 5: Perform adjustments by controlling valves, pumps, or other actuators to increase or decrease pressure to return the system pressure to the target range; The following is the basic formula of the algorithm: in: u(t) is the output of the controller at time t; K p , K i , K d They are proportional, integral, and derivative gains, which determine how strongly the controller responds to deviations; e(t) is the deviation, i.e., the difference between the target pressure and the actual pressure; ∫e(t)dt is the integral of the deviation and is used to eliminate steady-state errors; It is the rate of change of the deviation, which is used to predict the future trend of the deviation and thus achieve advance control.

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