Fire-resistant oil purification system of steam turbine

Abstract

The utility model provides a fire-resistant oil purification system of a steam turbine in the field of fire-resistant oil purification of steam turbines. The oil tank is provided with an oil outlet pipeline and an oil return pipeline; the oil outlet pipeline is connected with an oil outlet valve, and the oil return pipeline is connected with an oil return valve; the filter vat device comprises a dehydration filter vat, a first regeneration filter vat, a second regeneration filter vat, a coarse filter vat and a fine filter vat; the oil tank oil outlet pipeline is sequentially communicated with an oil outlet valve, an oil pump, a filter barrel device and an oil return valve, and the oil return valve is communicated with the oil tank; a first bypass valve is communicated between the oil inlet pipeline of the first regeneration filter barrel and the oil outlet pipeline of the oil pump, a second bypass valve is communicated between the oil inlet pipeline of the coarse filter barrel and the oil outlet pipeline of the oil pump, and a third bypass valve is communicated between the oil outlet pipeline of the fine filter barrel and the oil outlet pipeline of the oil pump. The device is suitable for the steam turbine and can flexibly isolate oil filtered by the filter barrel; and the high-pressure fire-resistant oil system can be supplemented with oil without disassembling a pipeline, so that the operation is convenient.

Description

Technical Field

[0001] The present application relates to the field of steam turbine fire-resistant oil purification, and in particular to a steam turbine fire-resistant oil purification system. Background Art

[0002] The control systems of large steam turbine units in thermal power plants today all use digital electro-hydraulic control systems (DEH), and the control oil of the system is high-pressure fire-resistant oil. In most power plants, an external fire-resistant oil purification device is configured to promote the dehydration and regeneration of fire-resistant oil. The current mainstream fire-resistant oil purification system includes a power oil pump, a suction filter barrel, a dehydration device, a regeneration device, a purification device, and a pressure alarm system. The fire-resistant oil enters the oil pump from the suction port, passes through the dehydration filter element, the regeneration filter element and the purification device in turn, and finally returns to the oil tank.

[0003] Due to unclean installation and maintenance environment of fire-resistant oil system, wear of moving parts in the system or local overheating, the oil quality is easy to deteriorate, which is mainly manifested in the darkening of the oil itself, unqualified particle size and acid value. In order to prevent the deterioration of fire-resistant oil quality, the system is equipped with a regeneration device, which promotes the regeneration of fire-resistant oil through the diatomaceous earth filter element provided by the system.

[0004] However, when designing the above system, only the oil filtering effect was considered, and the difficulties in starting, overhauling and maintaining the system under special working conditions were not considered. For example, when the unit is shut down in the cold winter, the temperature of the fire-resistant oil is low and the viscosity is high, causing the system to be overpressured and unable to start. The fire-resistant oil purification system needs to be emptied during maintenance. Each filter barrel of the above system is after the oil pump, and the oil cannot be discharged into the oil tank. It can only be discharged out of the system by lowering the throttle of the purification barrel. Since the fire-resistant oil itself is corrosive and toxic to a certain extent, discharging the fire-resistant oil out of the system not only wastes a lot of oil, but is also more likely to cause environmental pollution and personal injury. Secondly, the fire-resistant oil system needs to disassemble the pipeline to replenish the oil, which is not only cumbersome to operate, but also easy for impurities to enter the system and cause oil pollution. Summary of the invention

[0005] In response to the above problems, the present application provides a steam turbine fire-resistant oil purification system that can isolate and filter oil in different filter barrels according to the oil quality. Under special working conditions, the oil drain valve can be selectively opened to purify the oil in the system and return it to the oil pump inlet, which can reduce the system pressure and enable the system to start normally. An oil replenishment pipeline and valve are installed in front of the inlet filter barrel. There is no need to disassemble the pipeline to replenish the oil in the system. Isolation valves are installed before and after each filter barrel. When replacing the filter element, a single filter barrel can be isolated and the oil can be drained back to the oil tank, avoiding waste and leakage of oil.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] The present application provides a steam turbine fire-resistant oil purification system, comprising:

[0008] The oil tank has an oil outlet pipeline and an oil return pipeline; the oil outlet pipeline is connected to the oil outlet valve, and the oil return pipeline is connected to the oil return valve; the filter barrel device includes: a dehydration filter barrel, a first regeneration filter barrel, a second regeneration filter barrel, a coarse filter barrel, and a fine filter barrel; the oil tank oil outlet pipeline is connected to the oil outlet valve, an oil pump, a filter barrel device, and an oil return valve in sequence, and the oil return valve is connected to the oil tank; a first bypass valve is connected between the first regeneration filter barrel oil inlet pipeline and the oil pump oil outlet pipeline, a second bypass valve is connected between the coarse filter barrel oil inlet pipeline and the oil pump oil outlet pipeline, and a third bypass valve is connected between the fine filter barrel oil outlet pipeline and the oil pump oil outlet pipeline.

[0009] In a possible implementation, a plurality of filter barrels in the filter barrel device are connected in series in sequence, and the oil inlet pipeline and the oil outlet pipeline of each filter barrel are connected to an isolation valve.

[0010] In a possible implementation, the oil drain pipeline of each filter barrel is connected to an oil drain valve, and each oil drain valve is connected to a sewage drain valve.

[0011] In a possible implementation, the oil outlet pipelines of the dehydration filter barrel, the first regeneration filter barrel, the second regeneration filter barrel, and the fine filter barrel are ultimately connected to the oil tank.

[0012] In a possible implementation, it further includes an inlet filter barrel, wherein an oil inlet pipeline of the inlet filter barrel is connected to the oil outlet valve, and an oil outlet pipeline of the inlet filter barrel is connected to the oil pump.

[0013] In a possible implementation, a refueling valve is externally connected between the oil outlet valve and the inlet filter barrel via a branch line.

[0014] In a possible implementation, a drain valve is further included, the inlet filter barrel is connected to a first oil drain valve, and the oil drain valve where each filter barrel is located is connected to the drain valve.

[0015] In a possible implementation, the tops of the dehydration filter barrel, the first regeneration filter barrel, the second regeneration filter barrel, the coarse filter barrel, and the fine filter barrel are all connected to exhaust valves.

[0016] In one possible implementation, the dehydration filter barrel oil outlet pipeline is connected to a second filter barrel isolation valve, the first regeneration filter barrel oil outlet pipeline is connected to a third filter barrel isolation valve, and the second regeneration filter barrel oil outlet pipeline is connected to a fourth filter barrel isolation valve; the second filter barrel isolation valve, the third filter barrel isolation valve and the fourth filter barrel isolation valve are all connected in sequence to corresponding pressure measuring valves and corresponding differential pressure controllers, and a pressure gauge is externally connected between the pressure measuring valve and the differential pressure controller via a branch.

[0017] In a possible implementation, a plurality of the pressure difference controllers are connected in series.

[0018] Beneficial effects:

[0019] 1. By setting up three bypass valves, different filter barrels can be isolated for oil filtration according to the oil quality, which is convenient and flexible to operate. The filter barrels are connected in series through pipelines, so that the oil passes through multiple filter barrels during filtration, achieving a better oil purification effect.

[0020] 2. By installing oil replenishment pipes and valves in front of the inlet filter barrel, it is not necessary to dismantle the pipes to replenish the high-pressure fire-resistant oil system (EH oil system), which is convenient and flexible to operate; isolation valves are installed before and after each filter barrel. When replacing the filter element, a single filter barrel can be isolated, its oil drain valve is opened, the large bypass is opened, and the oil is drained back to the oil tank, avoiding waste and leakage of oil; an inlet filter barrel is set in front of the oil pump to perform preliminary purification of the oil, so that the oil passing through the oil pump is cleaner and the life of the oil pump is extended.

[0021] 3. Under special working conditions, the oil drain valve can be selectively opened to purify the oil in the system and return it to the oil pump inlet, which can reduce the system pressure and enable the system to start normally;

[0022] In general, the utility model can replenish oil to the high-pressure fire-resistant oil system. An inlet filter barrel is provided in front of the oil pump, which is beneficial to prolonging the life of the oil pump and selectively isolating different isolation barrels to filter oil, thereby improving the efficiency and speed of oil purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0024] Figure 1 A schematic structural diagram of a steam turbine fire-resistant oil purification system provided in an embodiment of the present application.

[0025] Reference numerals:

[0026] 1- refueling valve; 2- first oil drain valve; 3- sewage valve; 4- first filter barrel isolation valve; 5- second oil drain valve; 6- second filter barrel isolation valve; 7- third oil drain valve; 8- third filter barrel isolation valve; 9- fourth oil drain valve; 10- fourth filter barrel isolation valve; 11- fifth oil drain valve; 12- fifth filter barrel isolation valve; 13- sixth oil drain valve; 14- sixth filter barrel isolation valve; 15- oil outlet valve; 16- oil return valve; 17- inlet filter barrel; 18- first air release valve; 19- second air release valve; 20- third air release valve; 21- fourth air release valve; 22- fifth air release valve; 23- dehydration filter barrel; 24- first regeneration filter barrel; 25- second regeneration filter barrel; 26- coarse filter barrel; 27- fine filter barrel; 28- oil pump; 29- first bypass valve; 30- second bypass valve; 31- third bypass valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0029] Example 1

[0030] Figure 1 A steam turbine fire-resistant oil purification system provided in the embodiment of the present application includes: an oil tank, a refueling valve 1, an oil outlet valve 15, an oil return valve 16, an inlet filter barrel 17, an oil pump 28, and a drain valve 3;

[0031] The oil tank has an oil outlet pipeline and an oil return pipeline; the oil outlet pipeline is connected to the oil outlet valve 15, and the oil return pipeline is connected to the oil return valve 16;

[0032] In a possible implementation, the oil outlet pipeline of the oil tank is connected to the oil outlet valve 15, the inlet filter barrel 17, the oil pump 28, the filter barrel device, the oil return valve 16 in sequence, and then connected to the oil tank;

[0033] Specifically, the inlet filter barrel 17 is used to preliminarily purify the oil entering the system.

[0034] In a possible implementation, the inlet filter barrel 17 is also connected to the first oil drain valve 2, and the oil drain valve where each filter barrel is located is connected to the sewage drain valve 3;

[0035] Specifically, the drain valve 3 is convenient for discharging the waste oil filtered out by the purification system.

[0036] In a possible implementation, a refueling valve 1 is externally connected between the oil outlet valve 15 and the inlet filter barrel 17 through a branch line;

[0037] Specifically, a refueling valve 1 is installed in front of the inlet filter barrel 17; when the EH oil system (high-pressure fire-resistant oil system) needs to be refueled, the refueling valve 1 is used to refuel, and there is no need to disassemble the pipeline, which is convenient and flexible to operate.

[0038] In a possible implementation, a plurality of filter barrels connected in series in sequence include: a dehydration filter barrel 23, a first regeneration filter barrel 24, a second regeneration filter barrel 25, a coarse filter barrel 26, and a fine filter barrel 27;

[0039] In a possible implementation, the oil discharge pipeline of each filter barrel is connected to an oil discharge valve, and each oil discharge valve is connected to a sewage discharge valve 3 .

[0040] Specifically, the isolation valve of the filter tank is used to isolate the filter tank separately.

[0041] In a possible implementation, the oil outlet pipelines of the dehydration filter barrel 23, the first regeneration filter barrel 24, the second regeneration filter barrel 25, and the fine filter barrel 27 pass through the oil outlet isolation valve and are finally connected to the oil tank.

[0042] In a possible implementation, the oil outlet pipeline of the dehydration filter barrel 23 is connected to the second filter barrel isolation valve 6, the oil outlet pipeline of the first regeneration filter barrel 24 is connected to the third filter barrel isolation valve 8, the oil outlet pipeline of the second regeneration filter barrel 25 is connected to the fourth filter barrel isolation valve 10, the oil outlet pipeline of the coarse filter barrel 26 is connected to the fifth filter barrel isolation valve 12, and the oil outlet pipeline of the fine filter barrel 27 is connected to the sixth filter barrel isolation valve 14;

[0043] In a possible implementation, the oil drain pipeline of the dehydration filter barrel 23 is connected to the second oil drain valve 5, the oil drain pipeline of the first regeneration filter barrel 24 is connected to the third oil drain valve 7, the oil drain pipeline of the second regeneration filter barrel 25 is connected to the fourth oil drain valve 9, the oil drain pipeline of the coarse filter barrel 26 is connected to the fifth oil drain valve 11, and the oil drain pipeline of the fine filter barrel 27 is connected to the sixth oil drain valve 13;

[0044] Specifically, the oil drain valve of the filter barrel device is generally in a closed state. Under special working conditions, the oil drain valve is opened to discharge the oil to the inlet filter barrel 17 and enter the oil pump 28 through the pipeline, which can reduce the system pressure and maintain normal startup of the system.

[0045] In a possible implementation, a filter screen is provided in the dehydration filter barrel 23, the first regeneration filter barrel 24, the second regeneration filter barrel 25, the coarse filter barrel 26, the fine filter barrel 27, and the inlet filter barrel 17;

[0046] Optionally, the filter can be replaced to save the cost of using the filter barrel; when replacing the filter, close the isolation valve on the oil inlet and outlet pipelines of a single filter barrel to isolate the single filter barrel and avoid waste and leakage of oil.

[0047] In a possible implementation, the tops of multiple filter barrels are all connected to exhaust valves. The top of the dehydration filter barrel 23 is connected to the first air release valve 18, the top of the first regeneration filter barrel 24 is connected to the second air release valve 19, the top of the second regeneration filter barrel 25 is connected to the third air release valve 20, the top of the coarse filter barrel 26 is connected to the fourth air release valve 21, and the top of the fine filter barrel 27 is connected to the fifth air release valve 22;

[0048] Specifically, when the pressure in the filter barrel is too high, the air release valve is used to discharge the gas in the filter barrel to balance the air pressure inside and outside the filter barrel;

[0049] In a possible implementation, the second filter barrel isolation valve 6, the third filter barrel isolation valve 8, and the fourth filter barrel isolation valve 10 are connected to corresponding pressure measuring valves and corresponding differential pressure controllers in sequence, and a pressure gauge is connected externally between the pressure measuring valve and the differential pressure controller through a branch line.

[0050] Specifically, the pressure measuring valve and the pressure measuring gauge are used to measure the pressure of each filter tank;

[0051] In a possible implementation, a plurality of differential pressure controllers are connected in sequence;

[0052] Specifically, the pressure difference controller is used to control the pressure difference between adjacent filter barrels so that the pressure difference is controlled within a certain range;

[0053] Optionally, the differential pressure controller is connected to the control panel via a signal line;

[0054] Specifically, the differential pressure controller sends a differential pressure signal to the control panel, and sends an alarm signal when the signal value exceeds a warning value.

[0055] Specifically, the differential pressure controller after the fourth filter barrel isolation valve 10 is connected to the pressure measuring valve and connected to the oil outlet pipeline after the oil return valve 16; a pressure gauge is externally connected between the differential pressure controller and the pressure measuring valve through a branch line.

[0056] Specifically, when the system is operating normally, only a small amount of oil is sampled from the differential pressure controller and the pressure measuring valve pipeline, and the oil in the pipeline will not flow back to the oil tank.

[0057] In a possible implementation, the purification system further includes a plurality of bypass valves, a first bypass valve 29 is connected between the oil inlet pipeline of the first regeneration filter barrel 24 and the oil outlet pipeline of the oil pump 28, a second bypass valve 30 is connected between the oil inlet pipeline of the coarse filter barrel 26 and the oil outlet pipeline of the oil pump 28, and a third bypass valve 31 is connected between the oil outlet pipeline of the fine filter barrel 27 and the oil outlet pipeline of the oil pump 28;

[0058] Specifically, the pipelines where the first bypass valve 29, the second bypass valve 30, and the third bypass valve 31 are located are connected in parallel;

[0059] Specifically, according to the oil quality, different bypass valves are closed or opened, and the corresponding filter barrels are isolated to filter the oil.

[0060] Optionally, the refueling valve 1, the first oil drain valve 2, the sewage valve 3, the first filter barrel isolation valve 4, the second oil drain valve 5, the second filter barrel isolation valve 6, the third oil drain valve 7, the third filter barrel isolation valve 8, the fourth oil drain valve 9, the fourth filter barrel isolation valve 10, the fifth oil drain valve 11, the fifth filter barrel isolation valve 12, the sixth oil drain valve 13, and the sixth filter barrel isolation valve 14 use manual ball valves or electric control valves.

[0061] In one possible implementation, when the purification system achieves the technical effect of replenishing oil in the fire-resistant oil tank: the system closes the oil outlet valve 15, the first oil discharge valve 2, the first filter barrel isolation valve 4, the first bypass valve 29, the second bypass valve 30, the fifth filter barrel isolation valve 12, the sixth oil discharge valve 13, and the sixth filter barrel isolation valve 14; and opens the third bypass valve 31, the oil return valve 16, and the refueling valve 1.

[0062] In one possible implementation, when the purification system operates in regeneration mode: the system closes the refueling valve 1, the first oil drain valve 2, the sewage valve 3, the first filter barrel isolation valve 4, the second oil drain valve 5, the second filter barrel isolation valve 6, the third oil drain valve 7, the fourth oil drain valve 9, the fifth oil drain valve 11, the sixth oil drain valve 13, the second bypass valve 30, the third bypass valve 31, the first air release valve 18, the second air release valve 19, the third air release valve 20, the fourth air release valve 21, and the fifth air release valve 22; and opens the oil outlet valve 15, the first bypass valve 29, the third filter barrel isolation valve 8, the fourth filter barrel isolation valve 10, the fifth filter barrel isolation valve 12, the sixth filter barrel isolation valve 14, and the oil return valve 16.

[0063] In one possible implementation, when the purification system operates in purification mode: the system closes the refueling valve 1, the first oil drain valve 2, the sewage valve 3, the first filter barrel isolation valve 4, the fourth filter barrel isolation valve 10, the fifth oil drain valve 11, the sixth oil drain valve 13, the first bypass valve 29, the third bypass valve 31, the first air release valve 18, the second air release valve 19, the third air release valve 20, the fourth air release valve 21, and the fifth air release valve 22; and opens the oil outlet valve 15, the second bypass valve 30, the fifth filter barrel isolation valve 12, the sixth filter barrel isolation valve 14, and the oil return valve 16.

[0064] In one possible implementation, when the purification system is in maintenance status and needs to be emptied: the system closes the oil outlet valve 15, the refueling valve 1, the drain valve 3, the first filter barrel isolation valve 4, the first bypass valve 29, the second bypass valve 30, and the sixth filter barrel isolation valve 14; opens the third bypass valve 31, the oil return valve 16, the first oil drain valve 2, the second oil drain valve 5, the third oil drain valve 7, the fourth oil drain valve 9, the fifth oil drain valve 11, the sixth oil drain valve 13, the first air release valve 18, the second air release valve 19, the third air release valve 20, the fourth air release valve 21, and the fifth air release valve 22.

[0065] In one possible implementation, when the purification system involves special operating conditions, the system closes the refueling valve 1, the drain valve 3, the first bypass valve 29, the second bypass valve 30, the first air release valve 18, the second air release valve 19, the third air release valve 20, the fourth air release valve 21, and the fifth air release valve 22, and opens the oil outlet valve 15, the first oil drain valve 2, the first filter barrel isolation valve 4, the second filter barrel isolation valve 6, the third filter barrel isolation valve 8, the fourth filter barrel isolation valve 10, the fifth filter barrel isolation valve 12, the sixth filter barrel isolation valve 14, and the oil return valve 16, and selectively opens the second oil drain valve 5, the third oil drain valve 7, the fourth oil drain valve 9, the fifth oil drain valve 11, and the sixth oil drain valve 13 according to the system pressure.

[0066] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A steam turbine fire-resistant oil purification system, characterized in that: include: An oil tank having an oil outlet pipeline and an oil return pipeline; The oil outlet pipeline is connected to the oil outlet valve (15), and the oil return pipeline is connected to the oil return valve (16); The filter barrel device comprises: a dehydration filter barrel (23), a first regeneration filter barrel (24), a second regeneration filter barrel (25), a coarse filter barrel (26), and a fine filter barrel (27); The oil tank oil outlet pipeline is connected in sequence to an oil outlet valve (15), an oil pump (28), a filter barrel device, and an oil return valve (16), and the oil return valve (16) is connected to the oil tank; A first bypass valve (29) is connected between the oil inlet pipeline of the first regeneration filter barrel (24) and the oil outlet pipeline of the oil pump (28), a second bypass valve (30) is connected between the oil inlet pipeline of the coarse filter barrel (26) and the oil outlet pipeline of the oil pump (28), and a third bypass valve (31) is connected between the oil outlet pipeline of the fine filter barrel (27) and the oil outlet pipeline of the oil pump (28).

2. The purification system according to claim 1, characterized in that: The multiple filter barrels in the filter barrel device are connected in series in sequence, and the oil inlet pipeline and the oil outlet pipeline of each filter barrel are connected to an isolation valve.

3. The purification system according to claim 2, characterized in that: The oil discharge pipeline of each filter barrel is connected to an oil discharge valve, and each oil discharge valve is connected to a sewage discharge valve (3).

4. The purification system according to claim 1, characterized in that: The oil outlet pipelines of the dehydration filter barrel (23), the first regeneration filter barrel (24), the second regeneration filter barrel (25), and the fine filter barrel (27) are finally connected to the oil tank.

5. The purification system according to claim 1, characterized in that: It also comprises an inlet filter barrel (17), wherein an oil inlet pipeline of the inlet filter barrel (17) is in communication with the oil outlet valve (15), and an oil outlet pipeline of the inlet filter barrel (17) is in communication with the oil pump (28).

6. The purification system according to claim 5, characterized in that: A refueling valve (1) is externally connected between the oil outlet valve (15) and the inlet filter barrel (17) via a branch line.

7. The purification system according to claim 5, characterized in that: The inlet filter barrel (17) is connected to the first oil drain valve (2).

8. The purification system according to claim 1, characterized in that: The tops of the dehydration filter barrel (23), the first regeneration filter barrel (24), the second regeneration filter barrel (25), the coarse filter barrel (26), and the fine filter barrel (27) are all connected to exhaust valves.

9. The purification system according to claim 1, characterized in that: The oil outlet pipeline of the dehydration filter barrel (23) is connected to a second filter barrel isolation valve (6), the oil outlet pipeline of the first regeneration filter barrel (24) is connected to a third filter barrel isolation valve (8), and the oil outlet pipeline of the second regeneration filter barrel (25) is connected to a fourth filter barrel isolation valve (10); The second filter barrel isolation valve (6), the third filter barrel isolation valve (8) and the fourth filter barrel isolation valve (10) are connected in sequence to corresponding pressure measuring valves and corresponding differential pressure controllers, and a pressure gauge is externally connected between the pressure measuring valve and the differential pressure controller via a branch line.

10. The purification system according to claim 9, characterized in that: A plurality of the differential pressure controllers are connected in series.

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