A medium power gas turbine lubricating oil skid system

Abstract

The present invention belongs to the technical field of gas turbines, and specifically relates to a lubricating oil skid system for medium-power gas turbines. It includes a high-position oil tank, an oil supply filter device, an oil return cooling device, an oil return filter device, and an oil-gas separation device. The lubricating oil skid of the present invention provides lubricating oil for the gas turbine body. The lubricating oil skid is not equipped with an oil pump. It supplies lubricating oil to the unit through the high-position oil tank by relying on the gravitational potential energy of the lubricating oil height difference, thereby avoiding the problem that the auxiliary oil pump cannot supply oil to the unit lubricating oil system in time when power outages and shutdowns occur in the traditional lubricating oil system. When the gas turbine is running, the lubricating oil skid can provide the gas turbine with lubricating oil of suitable pressure, flow, viscosity, cleanliness, and temperature, and can play a role in heat dissipation for the gas turbine gearbox and bearings. At the same time, the lubricating oil provided by the present invention can also be used as the power oil of the VSV actuator.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbines, and in particular relates to a lubricating oil skid system for a medium-power gas turbine. Background Art

[0002] Gas turbines are impeller-type rotating machines that use gas as a working fluid and internal combustion to continuously rotate. Like other engines, gas turbines also require continuous lubrication during operation, so the lubricating oil skid system is a standard equipment for gas turbines.

[0003] Patent CN201120353448.3 discloses a gas turbine lubricating oil system. The lubricating oil system is set outside the generator box, works reliably and has stable performance. The oil pump on the lubricating oil skid sucks oil to lubricate the gearbox and generator. However, this technology does not take into account the problem that the auxiliary oil pump cannot supply oil to the unit lubricating oil system in time when the lubricating oil system has a power outage or shutdown failure. Summary of the invention

[0004] In view of this, the lubricating oil skid of the present invention provides lubricating oil for the gas turbine body. The lubricating oil skid is not equipped with an oil pump. It supplies lubricating oil to the unit through a high-position oil tank relying on the gravitational potential energy of the lubricating oil height difference, thereby avoiding the problem that the auxiliary oil pump cannot supply oil to the unit lubricating oil system in time when a power outage or shutdown failure occurs in the traditional lubricating oil system. When the gas turbine is running, the lubricating oil skid of the present invention can provide the gas turbine with lubricating oil of suitable pressure, flow, viscosity, cleanliness and temperature, and can dissipate heat for the gas turbine gearbox and bearings. At the same time, the lubricating oil provided by the present invention can also be used as the power oil of the VSV actuator.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the present invention is:

[0006] A medium power gas turbine lubricating oil skid system, comprising:

[0007] The high-position oil tank is provided with a temperature measuring device, a heating device and a liquid level measuring device inside; the temperature measuring device is used to measure the temperature of the oil in the high-position oil tank; the heating device is used to heat the oil in the high-position oil tank; the liquid level measuring device is used to measure the oil level in the high-position oil tank;

[0008] An oil supply valve, one end of which is connected to the oil outlet of the high-level oil tank, and the other end of which is connected to the suction port of the main body oil suction pump assembly of the gas turbine;

[0009] An oil supply filter device, one end of which is connected to the pump outlet of the main body oil suction pump assembly and the other end of which is connected to the lubricating oil inlet of the gas turbine;

[0010] An oil return cooling device, the inlet of which is connected to the pump outlet of the main body oil discharge pump of the gas turbine;

[0011] An oil return filter device, the inlet of which is connected to the outlet of the oil return cooling device;

[0012] The oil-gas separation device has an inlet connected to the oil-gas outlet of the high-position oil tank and the oil-gas separator outlet of the combustion engine body, and an oil outlet connected to the oil inlet of the high-position oil tank.

[0013] Furthermore, the oil skid system also includes a temperature control valve; the inlet of the temperature control valve is connected to the pump outlet of the main body oil discharge pump, and the outlet is connected to the medium inlet of the high-level oil tank, which is used to reversely adjust the size of the medium flow allowed to pass based on the high and low inlet medium temperature.

[0014] Furthermore, the oil skid system also includes a safety valve, the inlet of which is arranged between the temperature control valve and the main body oil discharge pump, and the outlet of which is connected to the medium inlet of the high-level oil tank.

[0015] Furthermore, the oil skid system also includes a control device; the control device is connected to the temperature measuring device and the heating device through a cable, and is used to control the start and stop of the heating device based on the measurement data of the temperature measuring device.

[0016] Furthermore, the liquid level measuring device includes a liquid level meter and a liquid level transmitter.

[0017] Furthermore, the oil supply filter device is configured as a double oil filter.

[0018] Furthermore, the oil return cooling device is a heat exchanger.

[0019] Furthermore, the return oil filter device is configured as a double oil filter.

[0020] Furthermore, the inlet of the oil-gas separation device is also connected to the oil-gas outlet of the oil-gas separator of the gas turbine.

[0021] Furthermore, the oil-gas separation device includes a connected heat exchanger and an oil mist separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A diagram showing the component distribution and working relationship of the lubricating oil skid system for a medium power gas turbine according to the present invention;

[0024] Among them: high-level oil tank-1; thermometer-2; temperature sensor-3; liquid level transmitter-4; liquid level meter-5; heater-6; return oil double oil filter-7; return oil double oil filter pressure differential transmitter-8; oil supply double oil filter-9; oil supply double oil filter pressure differential transmitter-10; oil supply valve-11; return oil pipeline double heat exchanger-12; temperature control valve-13; pressure safety valve-14; oil mist separator upstream heat exchanger-15; oil mist separator-16. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0027] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0030] In one embodiment of the present invention, a medium power gas turbine lubricating oil skid system is provided, such as Figure 1 As shown, including:

[0031] The high-position oil tank 1 is provided with a temperature measuring device, a heater 6 and a liquid level measuring device; the temperature measuring device is used to measure the temperature of the oil in the high-position oil tank 1; the heater 6 is used to heat the oil in the high-position oil tank 1; the liquid level measuring device is used to measure the oil level in the high-position oil tank 1;

[0032] The control device communicates with the temperature measuring device and the heater 6 through a cable connection, and is used to control the start and stop of the heater 6 based on the measurement data of the temperature measuring device.

[0033] In this embodiment, the lubricating oil tank is a high-position oil tank 1. A high-position oil tank 1 is set in the lubricating oil skid, and the gravitational potential energy of the lubricating oil height difference is relied on to supply lubricating oil to the unit. The advantage is that the auxiliary oil pump can be omitted in the lubricating oil skid to avoid the auxiliary oil pump failing to supply oil to the unit lubricating oil system in time when a power outage or shutdown occurs. The oil tank integrates components such as a temperature sensor 3, a thermometer 2, a liquid level transmitter 4, a liquid level gauge 5, and a heater 6. The temperature sensor 3 is used to measure the lubricating oil temperature inside the oil tank, and the measurement signal is transmitted from the site to the control system; the liquid level transmitter 4 is used to measure the lubricating oil level in the oil tank, and the measurement signal is transmitted from the site to the control system; the heater 6 can heat the lubricating oil in the oil tank to meet the temperature of the unit lubricating oil operation, and the start and stop of the heater 6 is controlled by the control system; the thermometer 2 and the liquid level gauge 5 can intuitively understand the temperature and liquid level of the lubricating oil in the oil tank. The oil tank is made of stainless steel, and an inspection hole is provided above the lubricating oil tank to inspect the inside of the oil tank, which is normally sealed with a blind plug.

[0034] The oil supply valve 11 has one end connected to the oil outlet of the high-level oil tank 1 and the other end connected to the suction port of the main body oil suction pump assembly of the gas turbine;

[0035] The oil supply filter device includes an oil supply duplex oil filter 9 and an oil supply duplex oil filter pressure differential transmitter 10, one end of which is connected to the pump outlet of the main body oil suction pump assembly, and the other end is connected to the lubricating oil inlet of the gas turbine;

[0036] An oil return cooling device, the inlet of which is connected to the pump outlet of the main body oil discharge pump of the gas turbine;

[0037] The return oil filter device comprises a return oil double oil filter 7 and a return oil double oil filter 7 differential pressure transmitter 8, the inlet of which is connected to the outlet of the return oil cooling device;

[0038] The oil-gas separation device has an inlet connected to the oil-gas outlet of the high-level oil tank 1 and the oil-gas separator outlet of the combustion engine body, and an oil outlet connected to the oil inlet of the high-level oil tank 1.

[0039] In this embodiment, the liquid level measuring device includes a liquid level meter 5 and a liquid level transmitter 4 .

[0040] In this embodiment, the oil supply filter device and the oil return filter device are set as a double oil filter. The oil supply filter device and the oil return filter device are set as a double oil filter. When the lubricating oil system is running, one oil filter is working and the other oil filter is standby. The advantage is that when the working oil filter needs to be replaced or fails, it can be manually switched to the standby oil filter. A differential pressure transmitter is provided at both ends of the oil filter to measure the oil filter pressure difference, and the measurement signal is transmitted to the control system.

[0041] In this embodiment, the return oil cooling device is a return oil pipeline double heat exchanger 12 .

[0042] In this embodiment, the oil-gas separation device includes an oil mist separator upstream heat exchanger 15 and an oil mist separator 16 which are connected.

[0043] The lubricating oil working process of this embodiment is as follows:

[0044] When the gas turbine is running, the pump assembly of the gas turbine body draws oil from the oil tank, and the lubricating oil flows through the pump assembly and enters the duplex oil filter for filtration. The filtered lubricating oil is transported to the various bearings of the gas turbine for lubrication and cooling. At the same time, part of the lubricating oil is also used as the power oil for VSV actuation.

[0045] The lubricating oil after working is transported to the return oil pipeline by the pump assembly of the engine body. The temperature of the lubricating oil after working will increase, and the lubricating oil will be cooled through the heat exchanger. The temperature control valve controls the amount of lubricating oil entering the heat exchanger. The cooled lubricating oil finally returns to the oil tank after passing through the return oil double oil filter 7.

[0046] The oil and gas generated after the oil and gas in the lubricating oil tank and the oil and gas in the combustion engine body are separated are further separated by the oil mist separator 16 of the lubricating oil skid. The separated gas is vented to a safe area and the oil returns to the oil tank.

[0047] In one embodiment, the oil skid system also includes a temperature control valve 13; the inlet of the temperature control valve 13 is connected to the pump outlet of the main body oil discharge pump, and the outlet is connected to the medium inlet of the high-level oil tank 1, which is used to reversely adjust the size of the medium flow allowed to pass through it based on the high and low temperatures of its inlet medium. The temperature of the lubricating oil will increase after work, so a temperature control valve and a duplex heat exchanger are set on the oil return pipeline of the lubricating oil skid. The duplex heat exchanger reduces the temperature of the lubricating oil in the return oil pipeline. The lubricating oil return temperature will vary greatly during the operation of the unit, so a temperature control valve is set to control the amount of lubricating oil entering the heat exchanger. As the lubricating oil return temperature increases, the temperature control valve will guide more lubricating oil to dissipate heat through the heat exchanger.

[0048] In one embodiment, the oil skid system further includes a safety valve, the inlet of which is arranged between the temperature control valve 13 and the main body oil discharge pump, and the outlet is connected to the medium inlet of the high-level oil tank 1. On the oil return pipeline of the lubricating oil skid, a pressure safety valve 14 is arranged upstream of the temperature control valve, which can release the lubricating oil back to the oil tank when the oil pressure in the oil return pipeline is high. In this embodiment, the safety valve is a pressure safety valve 14.

[0049] In one embodiment, the inlet of the oil-gas separation device is also connected to the oil-gas outlet of the oil-gas separator of the gas turbine. The oil mist separator 16 separates the oil and gas generated during the operation of the lubricating oil, and the oil and gas come from two sources: one comes from the oil and gas generated by the lubricating oil tank, and the other comes from the oil and gas separated by the oil-gas separator installed on the combustion engine body.

[0050] The lubricating oil working process of the present invention is as follows:

[0051] When the gas turbine is running, the pump assembly of the gas turbine body draws oil from the oil tank, and the lubricating oil flows through the pump assembly and enters the duplex oil filter for filtration. The filtered lubricating oil is transported to the various bearings of the gas turbine for lubrication and cooling. At the same time, part of the lubricating oil is also used as the power oil for VSV actuation.

[0052] The lubricating oil after working is transported to the return oil pipeline by the pump assembly of the engine body. The temperature of the lubricating oil after working will increase, and the lubricating oil will be cooled through the heat exchanger. The temperature control valve controls the amount of lubricating oil entering the heat exchanger. The cooled lubricating oil finally returns to the oil tank after passing through the return oil double oil filter 7.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A medium power gas turbine lubricating oil skid system, characterized in that: include: The high-position oil tank is provided with a temperature measuring device, a heating device and a liquid level measuring device inside; the temperature measuring device is used to measure the temperature of the oil in the high-position oil tank; the heating device is used to heat the oil in the high-position oil tank; the liquid level measuring device is used to measure the oil level in the high-position oil tank; An oil supply valve, one end of which is connected to the oil outlet of the high-level oil tank, and the other end of which is connected to the suction port of the main body oil suction pump assembly of the gas turbine; An oil supply filter device, one end of which is connected to the pump outlet of the main body oil suction pump assembly and the other end of which is connected to the lubricating oil inlet of the gas turbine; An oil return cooling device, the inlet of which is connected to the pump outlet of the main body oil discharge pump of the gas turbine; An oil return filter device, the inlet of which is connected to the outlet of the oil return cooling device; An oil-gas separation device, the inlet of which is connected to the oil-gas outlet of the high-position oil tank and the outlet of the oil-gas separator of the combustion engine body, and the oil outlet is connected to the oil inlet of the high-position oil tank; Wherein, when the lubricating oil skid system shuts down due to a fault, the high-level oil tank supplies lubricating oil to the unit based on the gravitational potential energy of the lubricating oil height difference.

2. The lubricating oil skid system according to claim 1, characterized in that: The oil skid system also includes a temperature control valve; the inlet of the temperature control valve is connected to the pump outlet of the main body oil discharge pump, and the outlet is connected to the medium inlet of the high-level oil tank, which is used to reversely adjust the size of the medium flow allowed to pass based on the high and low inlet medium temperature.

3. The lubricating oil skid system according to claim 2, characterized in that: The oil skid system further comprises a safety valve, the inlet of which is arranged between the temperature control valve and the main body oil discharge pump, and the outlet of which is connected to the medium inlet of the high-position oil tank.

4. The lubricating oil skid system according to claim 1, characterized in that: The oil skid system further includes a control device; the control device is connected to the temperature measuring device and the heating device via a cable, and is used to control the start and stop of the heating device based on the measurement data of the temperature measuring device.

5. The lubricating oil skid system according to claim 1, characterized in that: The liquid level measuring device comprises a liquid level meter and a liquid level transmitter.

6. The lubricating oil skid system according to claim 1, characterized in that: The oil supply filter device is arranged in a double oil filter.

7. The lubricating oil skid system according to claim 1, characterized in that: The oil return cooling device is a heat exchanger.

8. The lubricating oil skid system according to claim 1, characterized in that: The return oil filter device is arranged in a double oil filter.

9. The lubricating oil skid system according to claim 1, characterized in that: The inlet of the oil-gas separation device is also connected to the oil-gas outlet of the oil-gas separator of the gas turbine.

10. The lubricating oil skid system according to claim 1, characterized in that: The oil-gas separation device comprises a heat exchanger and an oil mist separator which are connected to each other.

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