A steam turbine lubricating oil return oil filtration system and its usage method

Abstract

A steam turbine lubricating oil return oil filtration system, which comprises: an oil tank, the oil tank including an oil return area, an intermediate area and an oil suction area; the oil return area and the intermediate area are separated by a first partition assembly; a first vertical filter screen plate is arranged on the first partition assembly to perform a first filtration on the steam turbine lubricating oil; the intermediate area and the oil suction area are separated by a second partition assembly; a second vertical filter screen plate is arranged on the second partition assembly to perform a second filtration on the steam turbine lubricating oil; a differential liquid level gauge for monitoring the liquid levels of the three areas is further arranged at the top of the oil tank. The steam turbine lubricating oil return oil filtration system of the present invention can not only perform two filtrations on the steam turbine lubricating oil, and the filter screen can be replaced online to improve work efficiency, but also can monitor in real time whether the filter screen is blocked and send an alarm signal to a remote monitoring terminal.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine lubricating oil, and particularly relates to a steam turbine lubricating oil return oil filtering system and a using method thereof. Background Art

[0002] The normal operation of the steam turbine lubricating oil system is one of the decisive factors for the safe and stable operation of the unit. During operation, if problems occur in the lubricating oil system, it will cause problems such as steam turbine bearing burning and excessive vibration, and in severe cases, production accidents such as unit tripping will occur. Therefore, the quality of the lubricating oil is very important. In addition to the oil purification device performing cyclic treatment such as water removal, impurity removal, acid removal, and emulsion removal on the lubricating oil, generally, the lubricating oil system is required to be provided with a filtering device at each of the return oil pipeline and the outlet pipeline of the lubricating oil hydraulic station to filter the lubricating oil flowing back to the hydraulic station and flowing back into the steam turbine system again. Generally, a double-barrel filter is used at the outlet of the lubricating oil of the hydraulic station, and the filter element can be replaced online by switching the handle between the two filters.

[0003] The return oil filtering device is generally designed by the lubricating oil station manufacturer itself, and different structures and different filtering methods result in great differences in the performance of the return oil filtering devices of each manufacturer.

[0004] The existing return oil filtering devices are generally relatively simple and rough. For example, some manufacturers directly weld the filter screen plate on the internal partition of the oil tank to jointly form a filtering device with the entire partition; such a structural design often causes a series of problems such as blockage of the return oil pipeline and reduction of the oil level, and this form of filtering device cannot be replaced online in time and can only be replaced when the unit is shut down, which affects the normal operation of the steam turbine. Summary of the Invention

[0005] In order to solve the deficiencies existing in the prior art, the purpose of the present invention is to provide a steam turbine lubricating oil return oil filtering system and method.

[0006] The present invention adopts the following technical solutions:

[0007] A steam turbine lubricating oil return oil filtration system, which comprises: an oil tank, the oil tank including an oil return area, an intermediate area and an oil suction area; the oil return area and the intermediate area are separated by a first partition component; a first vertical filter screen plate is arranged on the first partition component, the first vertical filter screen plate can perform the first filtration on the steam turbine lubricating oil, and the first vertical filter screen plate can be replaced; the intermediate area and the oil suction area are separated by a second partition component; a second vertical filter screen plate is arranged on the second partition component, the second vertical filter screen plate can perform the second filtration on the steam turbine lubricating oil, and the second vertical filter screen plate can be replaced; a first ultrasonic liquid level differential gauge for monitoring the liquid level difference between the oil return area and the intermediate area is further arranged on the top of the oil tank; a second ultrasonic liquid level differential gauge for monitoring the liquid level difference between the intermediate area and the oil suction area is further arranged on the top of the oil tank; an oil return port is arranged in the oil return area, and an oil suction port is arranged in the oil suction area.

[0008] As a preferred embodiment of the present invention, the first partition component includes a first partition and a first partition double-rail chute.

[0009] As a preferred embodiment of the present invention, the first vertical filter screen plate is arranged on the first partition double-rail chute.

[0010] As a preferred embodiment of the present invention, the second partition component includes a second partition, a second partition double-rail chute and a hook.

[0011] As a preferred embodiment of the present invention, the second vertical filter screen plate is arranged on the second partition double-rail chute.

[0012] As a preferred embodiment of the present invention, the hook is arranged above the second partition double-rail chute and is used for hanging the second vertical filter screen plate.

[0013] As a preferred embodiment of the present invention, the oil return port is arranged on the left side of the top of the oil return area and extends to the bottom of the oil return area.

[0014] As a preferred embodiment of the present invention, the first vertical filter screen plate is arranged at the upper right corner of the first partition component.

[0015] As a preferred embodiment of the present invention, the second vertical filter screen plate is arranged at the lower left corner of the second partition component.

[0016] As a preferred embodiment of the present invention, the oil suction port is arranged on the right side of the top of the oil suction area and extends to the lower side part of the oil suction area; it is used to increase the circulating path length of the steam turbine lubricating oil, thereby increasing the residence time of the steam turbine lubricating oil in the oil tank.

[0017] As a preferred embodiment of the present invention, the oil return port is arranged at the upper right side of the oil return area and extends to the bottom of the oil return area.

[0018] As a preferred embodiment of the present invention, the first vertical filter screen plate is arranged at the upper left corner of the first partition assembly.

[0019] As a preferred embodiment of the present invention, the second vertical filter screen plate is arranged at the lower right corner of the second partition assembly.

[0020] As a preferred embodiment of the present invention, the oil suction port is arranged at the upper left side of the oil suction area and extends to the lower side of the oil suction area; it is used to increase the circulation path length of the steam turbine lubricating oil, thereby increasing the residence time of the steam turbine lubricating oil in the oil tank.

[0021] As a preferred embodiment of the present invention, the first vertical filter screen plate is used for rough filtering of the lubricating oil, and its filtering accuracy is 200μm.

[0022] As a preferred embodiment of the present invention, the second vertical filter screen plate is used for fine filtering of the lubricating oil, and its filtering accuracy is 160μm.

[0023] As a preferred embodiment of the present invention, a first flange cover is provided on the upper cover of the oil tank at the position above the first vertical filter screen plate for replacing the first vertical filter screen plate.

[0024] As a preferred embodiment of the present invention, a second flange cover is provided on the upper cover of the oil tank at the position above the second vertical filter screen plate for replacing the second vertical filter screen plate.

[0025] As a preferred embodiment of the present invention, the first vertical filter screen plate includes a first filter screen, a first orifice plate, a first horizontal pressing plate, a first vertical pressing plate, a first rivet, a first frame and a first handle.

[0026] As a preferred embodiment of the present invention, a first orifice plate is arranged inside the first frame, and the first filter screen is fixed on the first orifice plate through the first horizontal pressing plate, the first vertical pressing plate and the first rivet.

[0027] As a preferred embodiment of the present invention, the first handle is arranged above the first frame, and the first handle can be rotated and placed in a horizontal position.

[0028] As a preferred embodiment of the present invention, the second vertical filter screen plate includes a second filter screen, a second orifice plate, a second horizontal pressing plate, a second vertical pressing plate, a second rivet, a second frame and a second handle.

[0029] As a preferred embodiment of the present invention, a second orifice plate is provided inside the second frame, and the second filter screen is fixed to the second orifice plate by a second cross pressing plate, a second longitudinal pressing plate, and second rivets.

[0030] As a preferred embodiment of the present invention, the second handle is provided above the second frame, and when the second vertical filter screen plate is placed on the second partition assembly, the second handle can be hung on the hook.

[0031] As a preferred embodiment of the present invention, a first manual shut-off valve, a second manual shut-off valve, and a third manual shut-off valve are respectively provided at the bottoms of the oil return area, the middle area, and the oil suction area for discharging the sediment at the bottom of the fuel tank.

[0032] As a preferred embodiment of the present invention, a first magnetic flap level gauge, a second magnetic flap level gauge, and a third magnetic flap level gauge are respectively provided in the oil return area, the middle area, and the oil suction area for monitoring the liquid level heights in the oil return area, the middle area, and the oil suction area.

[0033] A method for using a steam turbine lubricating oil return filtration system, the method comprising the following steps:

[0034] Step 1: The steam turbine lubricating oil enters the fuel tank from the oil return port for the first sedimentation. After the impurities settle to the bottom of the oil return area, they are regularly discharged through the first manual shut-off valve. The lubricating oil after the first sedimentation enters the middle area after being roughly filtered by the first vertical filter screen plate, and the liquid levels in the oil return area and the middle area are monitored.

[0035] Step 2: The lubricating oil in the middle area undergoes a second sedimentation. After the impurities settle to the bottom of the middle area, they are regularly discharged through the second manual shut-off valve. The lubricating oil after the second sedimentation enters the oil suction area after being finely filtered by the second vertical filter screen plate, and the liquid levels in the middle area and the oil suction area are monitored.

[0036] Step 3: The lubricating oil in the oil suction area undergoes a third sedimentation. After the impurities settle to the bottom of the oil suction area, they are regularly discharged through the third manual shut-off valve. The lubricating oil after the third sedimentation is transported to the use area via an oil pump through the oil suction port.

[0037] As a preferred embodiment of the present invention, in Step 1, when there is a liquid level difference between the oil return area and the middle area, the first vertical filter screen plate is blocked.

[0038] As a preferred embodiment of the present invention, in Step 2, when there is a liquid level difference between the middle area and the oil suction area, the second vertical filter screen plate is blocked.

[0039] As a preferred embodiment of the present invention, after the liquid level differences between the oil return area and the middle area and between the middle area and the oil suction area are monitored by the first ultrasonic liquid level difference meter and the second ultrasonic liquid level difference meter and converted into standard electrical signals, when the liquid level difference exceeds the set value, the remote monitoring terminal sends an alarm signal; or there is a certain liquid level difference observed locally through the first magnetic flap level gauge, the second magnetic flap level gauge, and the third magnetic flap level gauge. At this time, the first vertical filter plate or the second vertical filter plate is blocked and needs to be replaced and cleaned.

[0040] As a preferred embodiment of the present invention, in step 1, when the first vertical filter plate needs to be cleaned due to excessive blockage of impurities, open the first flange cover. After placing a new first vertical filter plate in the double-track chute of the first partition, take out the original first vertical filter plate through the first handle for cleaning.

[0041] As a preferred embodiment of the present invention, in step 2, when the second vertical filter plate needs to be cleaned due to excessive blockage of impurities, open the second flange cover. After placing a new second vertical filter plate in the double-track chute of the second partition, take out the original second vertical filter plate through the second handle for cleaning.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] (1) Through the partition, the fuel tank is divided into an oil return area, a middle area, and an oil suction area, and by optimizing the positions of the two vertical filter plates, ultimately the circulation path length of the lubricating oil can be maximally increased, thereby increasing the residence time of the lubricating oil in the fuel tank, which is more conducive to the cooling and heat dissipation of the lubricating oil, the precipitation of bubbles, and the sedimentation of impurities;

[0044] (2) By opening a flange cover on the top plate of the fuel tank at the position of the vertical filter plate, placing the vertical filter plate in the chute, and setting it as a double-track chute, the online replacement of the vertical filter plate can be realized;

[0045] (3) By setting the position of the double-track chute on the unfiltered side, when the filter screen is pulled out along the chute, impurities will not fall onto the filtered oil side, avoiding the contamination of the filtered lubricating oil;

[0046] (4) Through the designed structure of the vertical filter plate, flushing or replacement can be selected according to the usage condition of the filter screen;

[0047] (5) By setting the bottom of the fuel tank in a sloping form with the front higher than the rear and arranging a sewage discharge port in each of the three areas, the regular sewage discharge function of the fuel tank can be realized;

[0048] (6) By arranging three local magnetic flap level gauges in the oil return area, the middle area, and the oil suction area, it is possible to judge whether the two filters are blocked and the degree of blockage according to the liquid level of the magnetic flap level gauge.

[0049] (7) By installing ultrasonic liquid level differential gauges between the oil return area and the middle area, and between the middle area and the oil suction area, the liquid level difference on both sides of each filter screen plate can be remotely monitored, and the liquid level can be converted into a standard electrical signal. When the filter screen is blocked, the liquid level difference at the corresponding position exceeds the set value, and the remote monitoring terminal will send out an alarm signal. Description of the Drawings

[0050] Figure 1 is the front sectional view of a steam turbine lubricating oil return filtration system of the present invention;

[0051] Figure 2 is the top sectional view of a steam turbine lubricating oil return filtration system of the present invention;

[0052] Figure 3 is the installation effect diagram of the first vertical filter screen plate;

[0053] Figure 4 is the installation effect diagram of the second vertical filter screen plate;

[0054] Figure 5 is the structural schematic diagram of the first partition assembly;

[0055] Figure 6 is the structural schematic diagram of the second partition assembly;

[0056] Figure 7 is the structural schematic diagram of the first vertical filter screen plate;

[0057] Figure 8 is the structural schematic diagram of the second vertical filter screen plate.

[0058] In the figure:

[0059] 1 - First partition assembly; 2 - First vertical filter screen plate; 3 - First flange cover; 4 - First ultrasonic liquid level differential gauge; 5 - Second ultrasonic liquid level differential gauge; 6 - Second flange cover; 7 - Second partition assembly; 8 - Second vertical filter screen plate; 9 - First manual stop valve; 10 - Second manual stop valve; 11 - Third manual stop valve; 12 - First magnetic flap level gauge; 13 - Second magnetic flap level gauge; 14 - Third magnetic flap level gauge; 15 - Oil return port; 16 - Oil suction port; A - Oil return area; B - Middle area; C - Oil suction area.

[0060] 101 - First partition; 102 - First double - rail chute of the partition;

[0061] 201 - First filter screen; 202 - First orifice plate; 203 - First horizontal pressing plate; 204 - First vertical pressing plate; 205 - First rivet; 206 - First frame; 207 - First handle;

[0062] 701 - Second partition board; 702 - Double - track chute of the second partition board; 703 - Hook

[0063] 801 - Second filter screen; 802 - Second orifice plate; 803 - Second horizontal pressure plate; 804 - Second vertical pressure plate; 805 - Second rivet; 806 - Second frame; 807 - Second handle Detailed implementation manners

[0064] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0065] Figure 1 It is the front - view sectional view of a steam turbine lubricating oil return - oil filtering system of the present invention, Figure 2 It is the top - view sectional view of a steam turbine lubricating oil return - oil filtering system of the present invention. As Figure 1 、 Figure 2 shown, a steam turbine lubricating oil return - oil filtering system of the present invention mainly includes an oil tank.

[0066] The interior of the oil tank is divided into an oil return area A, an intermediate area B, and an oil suction area C.

[0067] The oil return area A and the intermediate area B are separated by a first partition assembly 1. A first vertical filter screen plate 2 is provided on the first partition assembly 1. The first vertical filter screen plate 2 can perform the first - stage filtration on the steam turbine lubricating oil, and the first vertical filter screen plate 2 can be replaced.

[0068] The intermediate area B and the oil suction area C are separated by a second partition assembly 7. A second vertical filter screen plate 8 is provided on the second partition assembly 7. The second vertical filter screen plate 8 can perform the second - stage filtration on the steam turbine lubricating oil, and the second vertical filter screen plate 8 can be replaced.

[0069] At the top of the oil tank, a first ultrasonic liquid - level differential gauge 4 for monitoring the liquid - level difference between the oil return area A and the intermediate area B and a second ultrasonic liquid - level differential gauge 5 for monitoring the liquid - level difference between the intermediate area B and the oil suction area C are respectively provided.

[0070] The oil return area A is provided with an oil return port 15, and the oil suction area C is provided with an oil suction port 16.

[0071] The oil return port 15 is arranged at the upper left side of the top of the oil return area A and extends to the bottom of the oil return area A. The first vertical filter plate 2 is arranged at the upper right corner of the first partition assembly 1. The second vertical filter 8 is arranged at the lower left corner of the second partition assembly 7. The oil suction port 16 is arranged at the upper right side of the top of the oil suction area C and extends to the lower side of the oil suction area C. Or, the oil return port 15 is arranged at the upper right side of the top of the oil return area A and extends to the bottom of the oil return area A. The first vertical filter plate 2 is arranged at the upper left corner of the first partition assembly 1. The second vertical filter 8 is arranged at the lower right corner of the second partition assembly 7. The oil suction port 16 is arranged at the upper left side of the top of the oil suction area C and extends to the lower side of the oil suction area C. This is used to increase the length of the circulation path of the steam turbine lubricating oil, thereby increasing the residence time of the steam turbine lubricating oil in the oil tank, which is more conducive to the cooling and heat dissipation of the lubricating oil, the precipitation of bubbles and the precipitation of impurities.

[0072] As Figure 3 , Figure 5 shown, the first partition assembly 1 includes a first partition 101 and a first partition double-rail chute 102. The first vertical filter plate 2 is arranged on the first partition double-rail chute 102.

[0073] As Figure 4 , Figure 6 shown, the second partition assembly 7 includes a second partition 701, a second partition double-rail chute 702 and a hook 703. The second vertical filter plate 8 is arranged on the second partition double-rail chute 702. The hook 703 is arranged above the second partition double-rail chute 702 and is used to hang the second vertical filter plate 8.

[0074] The first vertical filter plate 2 is used for the rough filtration of the lubricating oil, and its filtration accuracy is 200μm. A first flange cover 3 is arranged on the upper cover of the oil tank at the position above the first vertical filter plate 2 for replacing the first vertical filter plate 2.

[0075] The second vertical filter plate 8 is used for the fine filtration of the lubricating oil, and its filtration accuracy is 160μm. A second flange cover 6 is arranged on the upper cover of the oil tank at the position above the second vertical filter plate 8 for replacing the second vertical filter plate 8.

[0076] The chutes of the two partitions are arranged with double rails. When replacing, only need to open the flange cover, install the spare filter plate on another reserved chute track, and then pull out the blocked filter plate. In order to avoid the impurities on the filter falling and polluting the lubricating oil when pulling out the vertical filter plate, the reserved chute is arranged on the unfiltered side, so that when the filter is pulled out along the chute, the impurities will not fall to the filtered oil side, avoiding the pollution of the filtered lubricating oil.

[0077] As Figure 7As shown in the figure, the first vertical filter plate 2 includes a first filter screen 201, a first orifice plate 202, a first horizontal pressing plate 203, a first vertical pressing plate 204, a first rivet 205, a first frame 206, and a first handle 207. A first orifice plate 202 is arranged inside the first frame 206. The first filter screen 201 is fixed on the first orifice plate 202 through the first horizontal pressing plate 203, the first vertical pressing plate 204, and the first rivet 205. The first handle 207 is arranged above the first frame 206, and the first handle 207 can be rotated to a horizontal position so as not to cause a spatial conflict with the upper first flange cover 3, resulting in the inability to cover the first flange cover 3.

[0078] As Figure 8 shown in the figure, the second vertical filter plate 8 includes a second filter screen 801, a second orifice plate 802, a second horizontal pressing plate 803, a second vertical pressing plate 804, a second rivet 805, a second frame 806, and a second handle 807. A second orifice plate 802 is arranged inside the second frame 806. The second filter screen 801 is fixed on the second orifice plate 802 through the second horizontal pressing plate 803, the second vertical pressing plate 804, and the second rivet 805. The second handle 807 is arranged above the second frame 806, and when the second vertical filter plate 8 is placed on the second partition assembly 7, the second handle 807 can be hung at the hook 703, saving the replacement space above the fuel tank when the second vertical filter plate 8 is pulled out along the second partition double-track chute 702.

[0079] A first manual stop valve 9, a second manual stop valve 10, and a third manual stop valve 11 are respectively arranged at the bottoms of the oil return area A, the middle area B, and the oil suction area C for discharging the sediment at the bottom of the fuel tank. The bottom of the fuel tank is arranged in a structure inclined towards the stop valve, facilitating the discharge of the sediment.

[0080] A first magnetic flap level gauge 12, a second magnetic flap level gauge 13, and a third magnetic flap level gauge 14 are respectively arranged in the oil return area A, the middle area B, and the oil suction area C for monitoring the liquid level heights of the oil return area A, the middle area B, and the oil suction area C.

[0081] A method for using a steam turbine lubricating oil return filtration system, the method comprising the following steps:

[0082] Step 1: The steam turbine lubricating oil enters the fuel tank from the oil return port 15 for the first sedimentation. After the impurities settle to the bottom of the oil return area A, they are regularly discharged through the first manual stop valve 9. The lubricating oil after the first sedimentation enters the middle area B after being roughly filtered by the first vertical filter plate 2, and the liquid levels of the oil return area A and the middle area B are monitored;

[0083] Step 2: The lubricating oil in the middle zone B undergoes a second precipitation. After the impurities precipitate to the bottom of the middle zone B, they are regularly discharged through the second manual stop valve 10. The lubricating oil after the second precipitation enters the oil suction zone C after being precisely filtered by the second vertical filter screen plate 8, and the liquid levels of the middle zone B and the oil suction zone C are monitored.

[0084] Step 3: The lubricating oil in the oil suction zone C undergoes a third precipitation. After the impurities precipitate to the bottom of the oil suction zone C, they are regularly discharged through the third manual stop valve 11. The lubricating oil after the third precipitation is transported to the usage area via an oil pump through the oil suction port 16.

[0085] In Step 1, when there is a liquid level difference between the oil return zone A and the middle zone B, the first vertical filter screen plate 2 is blocked. In Step 2, when there is a liquid level difference between the middle zone B and the oil suction zone C, the second vertical filter screen plate 8 is blocked.

[0086] The liquid level differences between the oil return zone A and the middle zone B and between the middle zone B and the oil suction zone C are monitored by the first ultrasonic liquid level difference meter 4 and the second ultrasonic liquid level difference meter 5 and converted into standard electrical signals. When the liquid level difference exceeds the set value, the remote monitoring terminal sends an alarm signal; or a certain liquid level difference is observed locally through the first magnetic flap level gauge 12, the second magnetic flap level gauge 13, and the third magnetic flap level gauge 14. At this time, the first vertical filter screen plate 2 or the second vertical filter screen plate 8 is blocked and needs to be replaced and cleaned.

[0087] In Step 1, when the first vertical filter screen plate 2 needs to be cleaned due to excessive impurity blockage, the first flange cover 3 is opened. After placing a new first vertical filter screen plate 2 in the first partition double-rail chute 102, the original first vertical filter screen plate 2 is taken out for cleaning through the first handle 207.

[0088] In Step 2, when the second vertical filter screen plate 8 needs to be cleaned due to excessive impurity blockage, the second flange cover 6 is opened. After placing a new second vertical filter screen plate 8 in the second partition double-rail chute 702, the original second vertical filter screen plate 8 is taken out for cleaning through the second handle 807.

[0089] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0090] (1) By means of the partition, the fuel tank is divided into an oil return zone, a middle zone, and an oil suction zone, and the positions of the 2 vertical filter screen plates are optimized. Finally, the circulation path length of the lubricating oil can be maximally increased, thereby increasing the residence time of the lubricating oil in the fuel tank, which is more conducive to the cooling and heat dissipation of the lubricating oil, the precipitation of bubbles, and the precipitation of impurities.

[0091] (2)Online replacement of the vertical filter plate can be achieved by opening a flange cover on the top plate of the fuel tank at the position of the vertical filter plate and placing the vertical filter plate in the chute, which is set as a double-track chute.

[0092] (3)By setting the double-track chute on the unfiltered side, impurities will not fall onto the filtered oil side when the filter screen is drawn out along the chute, avoiding contamination of the filtered lubricating oil.

[0093] (4)With the designed structure of the vertical filter plate, flushing or replacement can be selected according to the usage of the filter screen.

[0094] (5)By setting the bottom of the fuel tank in a sloping form with the front higher than the rear and arranging a drain port in each of the three areas, the regular drainage function of the fuel tank can be realized.

[0095] (6)By arranging three local magnetic flap level gauges in the oil return area, the middle area and the oil suction area, it is possible to judge whether the two filter screens are blocked and the degree of blockage according to the liquid level of the magnetic flap level gauges.

[0096] (7)By arranging ultrasonic level difference gauges between the oil return area and the middle area, and between the middle area and the oil suction area, the liquid level difference on both sides of each filter plate can be remotely monitored, and the liquid level can be converted into a standard electrical signal. When the filter screen is blocked, the liquid level difference at the corresponding position exceeds the set value, and an alarm signal is sent by the remote monitoring terminal.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A steam turbine lubricating oil return oil filtration system, which comprises: an oil tank, characterized in that: the oil tank includes an oil return area (A), an intermediate area (B), and an oil suction area (C); a first partition assembly (1) is provided between the oil return area (A) and the intermediate area (B) to separate them; a first vertical filter screen plate (2) is provided on the first partition assembly (1), and the first vertical filter screen plate (2) can perform the first filtration on the steam turbine lubricating oil, and the first vertical filter screen plate (2) can be replaced; a second partition assembly (7) is provided between the intermediate area (B) and the oil suction area (C) to separate them; a second vertical filter screen plate (8) is provided on the second partition assembly (7), and the second vertical filter screen plate (8) can perform the second filtration on the steam turbine lubricating oil, and the second vertical filter screen plate (8) can be replaced; an oil return port (15) is provided in the oil return area (A), and an oil suction port (16) is provided in the oil suction area (C); the oil return port (15) is arranged on the top left side of the oil return area (A) and extends to the bottom of the oil return area (A); the first vertical filter screen plate (2) is arranged at the upper right corner of the first partition assembly (1); the second vertical filter screen plate (8) is arranged at the lower left corner of the second partition assembly (7); the oil suction port (16) is arranged on the top right side of the oil suction area (C) and extends to the lower side part of the oil suction area (C); for increasing the circulation path length of the steam turbine lubricating oil, thereby increasing the residence time of the steam turbine lubricating oil in the oil tank; a first ultrasonic liquid level differential gauge (4) for monitoring the liquid level difference between the oil return area (A) and the intermediate area (B) is further provided on the top of the oil tank and is respectively connected to the oil return area (A) and the intermediate area (B); a second ultrasonic liquid level differential gauge (5) for monitoring the liquid level difference between the intermediate area (B) and the oil suction area (C) is further provided on the top of the oil tank and is respectively connected to the intermediate area (B) and the oil suction area (C); a first manual stop valve (9), a second manual stop valve (10), and a third manual stop valve (11) are respectively provided at the bottoms of the oil return area (A), the intermediate area (B), and the oil suction area (C) for discharging the sediment at the bottom of the oil tank; a first magnetic flap liquid level gauge (12), a second magnetic flap liquid level gauge (13), and a third magnetic flap liquid level gauge (14) are respectively provided in the oil return area (A), the intermediate area (B), and the oil suction area (C) for monitoring the liquid level heights of the oil return area (A), the intermediate area (B), and the oil suction area (C); the first partition assembly (1) includes a first partition (101) and a first partition double-rail chute (102); the first vertical filter screen plate (2) is arranged on the first partition double-rail chute (102); the second partition assembly (7) includes a second partition (701), a second partition double-rail chute (702), and a hook (703); the second vertical filter screen plate (8) is arranged on the second partition double-rail chute (702); the hook (703) is arranged above the second partition double-rail chute (702) for hanging the second vertical filter screen plate (8).

2. The steam turbine lubricating oil return oil filtration system according to claim 1, characterized in that: The oil return port (15) is arranged at the upper right side of the oil return area (A) and extends to the bottom of the oil return area (A); The first vertical filter screen plate (2) is arranged at the upper left corner of the first partition assembly (1); The second vertical filter screen plate (8) is arranged at the lower right corner of the second partition assembly (7); The oil suction port (16) is arranged at the upper left side of the oil suction area (C) and extends to the lower side part of the oil suction area (C); it is used to increase the circulation path length of the steam turbine lubricating oil, thereby increasing the residence time of the steam turbine lubricating oil in the oil tank.

3. A steam turbine lubricating oil return oil filtration system according to claim 1, characterized in that: The first vertical filter screen plate (2) is used for rough filtration of the lubricating oil, and its filtration accuracy is 200μm; The second vertical filter screen plate (8) is used for fine filtration of the lubricating oil, and its filtration accuracy is 160μm.

4. A steam turbine lubricating oil return oil filtration system according to claim 3, characterized in that: A first flange cover (3) is arranged on the upper cover of the oil tank at the position above the first vertical filter screen plate (2) for replacing the first vertical filter screen plate (2); A second flange cover (6) is arranged on the upper cover of the oil tank at the position above the second vertical filter screen plate (8) for replacing the second vertical filter screen plate (8).

5. A steam turbine lubricating oil return oil filtration system according to claim 4, characterized in that: The first vertical filter screen plate (2) includes a first filter screen (201), a first orifice plate (202), a first horizontal pressing plate (203), a first vertical pressing plate (204), a first rivet (205), a first frame (206) and a first handle (207); A first orifice plate (202) is arranged inside the first frame (206), and the first filter screen (201) is fixed on the first orifice plate (202) through the first horizontal pressing plate (203), the first vertical pressing plate (204) and the first rivet (205); The first handle (207) is arranged above the first frame (206), and the first handle (207) can be rotated and placed in a horizontal position.

6. A steam turbine lubricating oil return oil filtration system according to claim 4, characterized in that: The second vertical filter screen plate (8) includes a second filter screen (801), a second orifice plate (802), a second horizontal pressing plate (803), a second vertical pressing plate (804), a second rivet (805), a second frame (806) and a second handle (807); A second orifice plate (802) is arranged inside the second frame (806), and the second filter screen (801) is fixed on the second orifice plate (802) through the second horizontal pressing plate (803), the second vertical pressing plate (804) and the second rivet (805); The second handle (807) is arranged above the second frame (806), and when the second vertical filter screen plate (8) is placed on the second partition assembly (7), the second handle (807) can be hung on the hook (703).

7. A method for using a steam turbine lubricating oil return oil filtration system according to any one of claims 1 to 6, characterized in that: The usage method includes the following steps: Step 1: The steam turbine lubricating oil enters the oil tank from the oil return port (15) for the first precipitation. After the impurities precipitate to the bottom of the oil return area (A), they are regularly discharged through the first manual stop valve (9). The lubricating oil after the first precipitation enters the middle area (B) after being roughly filtered by the first vertical filter plate (2), and the liquid levels of the oil return area (A) and the middle area (B) are monitored. Step 2: The lubricating oil in the middle area (B) undergoes a second precipitation. After the impurities precipitate to the bottom of the middle area (B), they are regularly discharged through the second manual stop valve (10). The lubricating oil after the second precipitation enters the oil suction area (C) after being finely filtered by the second vertical filter plate (8), and the liquid levels of the middle area (B) and the oil suction area (C) are monitored. Step 3: The lubricating oil in the oil suction area (C) undergoes a third precipitation. After the impurities precipitate to the bottom of the oil suction area (C), they are regularly discharged through the third manual stop valve (11). The lubricating oil after the third precipitation is transported to the usage area via the oil suction port (16) by an oil pump.

8. The usage method of a steam turbine lubricating oil return filtration system according to claim 7, characterized in that: in Step 1, when there is a liquid level difference between the oil return area (A) and the middle area (B), the first vertical filter plate (2) is blocked; in Step 2, when there is a liquid level difference between the middle area (B) and the oil suction area (C), the second vertical filter plate (8) is blocked.

9. The usage method of a steam turbine lubricating oil return filtration system according to claim 8, characterized in that: After the liquid level differences between the oil return area (A) and the middle area (B) and between the middle area (B) and the oil suction area (C) are monitored by the first ultrasonic liquid level difference meter (4) and the second ultrasonic liquid level difference meter (5) and converted into standard electrical signals, when the liquid level difference exceeds the set value, the remote monitoring terminal sends an alarm signal; or when there is a certain liquid level difference observed locally through the first magnetic flap level gauge (12), the second magnetic flap level gauge (13), and the third magnetic flap level gauge (14), at this time, the first vertical filter plate (2) or the second vertical filter plate (8) is blocked and needs to be replaced and cleaned.

10. The usage method of a steam turbine lubricating oil return filtration system according to claim 7, characterized in that: in Step 1, when the first vertical filter plate (2) needs to be cleaned due to excessive blockage of impurities, the first flange cover (3) is opened. After a new first vertical filter plate (2) is placed in the first partition double-rail chute (102), the original first vertical filter plate (2) is taken out for cleaning through the first handle (207).

11. The usage method of a steam turbine lubricating oil return filtration system according to claim 7, characterized in that: in Step 2, when the second vertical filter plate (8) needs to be cleaned due to excessive blockage of impurities, the second flange cover (6) is opened. After a new second vertical filter plate (8) is placed in the second partition double-rail chute (702), the original second vertical filter plate (8) is taken out for cleaning through the second handle (807).

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