Lubricating oil cooling system of movable gas turbine generator set

Abstract

The utility model provides a lubricating oil cooling system of a movable gas turbine generator set. The lubricating oil cooling system comprises a heat exchanger, a first-stage temperature control valve, an oil cooler and a second-stage temperature control valve. A lubricating oil input end of the heat exchanger is connected with a first output end of the lubricating oil circulating system, a lubricating oil output end is connected with a first input end of the primary temperature control valve, a fuel input end is connected with a first output end of the fuel storage system, and a fuel output end is connected with a first input end of the fuel combustion system; the first output end of the first-stage temperature control valve is connected with the first input end of the second-stage temperature control valve, the second output end of the first-stage temperature control valve is connected with the input end of the oil cooler, the output end of the oil cooler is connected with the second input end of the second-stage temperature control valve, and the output end of the second-stage temperature control valve is connected with the input end of the lubricating oil circulating system. According to the scheme, the requirement for the refrigerating capacity of the air-cooled oil cooler is greatly reduced, the occupied space is reduced, the energy consumption of a fan motor is reduced, the heat dissipation loss of equipment is effectively recovered, and the energy conversion efficiency of the equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mobile gas turbine generator set cooling technical field, specifically, it relates to a kind of lubricating oil cooling system of mobile gas turbine generator set. BACKGROUND

[0002] In renewable energy driven distributed system (such as photovoltaic, wind power, chemical coupling fuel production, etc.), green fuel energy storage becomes the key technology to balance power supply and demand. Through the stored green fuel (such as hydrogen synthesized liquid ammonia produced by electrolytic water), gas turbine combustion power generation can be used when peak shaving is required, to alleviate power grid fluctuations. To improve equipment reuse rate and adapt to multi-scenario deployment, mobile gas turbine generator sets become core equipment, but the contradiction between its compact design requirements and fuel combustion characteristics poses a severe challenge to the supporting system, especially the problem of lubricating oil system thermal management.

[0003] Compared with traditional natural gas combustion, green fuel (such as liquid ammonia, etc.) has slow combustion speed (laminar flame speed is much lower than that of natural gas) and low burnout rate. Gas turbine needs to extend flame residence time, resulting in uneven temperature distribution at turbine inlet and increased heat conduction at key parts such as bearings (test data shows that the lubricating oil temperature rise rate of gas turbine bearing area under pure ammonia fuel condition is as high as 4℃ / min, far exceeding the natural gas rate of 2.2℃ / min), which leads to the contradiction between the surge of thermal load and the limitation of cooling capacity under green fuel (such as liquid ammonia, etc.) combustion conditions. Therefore, to ensure that the bearing temperature is stable within the safety threshold (≤110℃), the cooling power of the lubricating oil system (which is an important part of the generator set and needs to continuously provide low-temperature lubricating oil for the rotor bearing to reduce dynamic friction and remove heat generated by the equipment) needs to be further improved.

[0004] Since mobile gas turbine generator sets are randomly deployed in various regions (such as Gobi desert, islands, etc.), it is impossible to determine whether there is a qualified water source nearby as a cooling medium, so it is impossible to rely on water-cooled oil cooler to cool the lubricating oil system at all times, i.e. water-cooled oil cooler cannot be used for cooling in areas without qualified water sources, and only air-cooled oil cooler (air cooler) can be used to cool the lubricating oil system. However, conventional air coolers use finned tube bundles and axial flow fans for heat dissipation, but they have the following technical pain points:

[0005] (1) Space constraint: highway transportation standards limit the width of the unit to ≤3.5m, and the heat dissipation area density of traditional finned tube air coolers is difficult to exceed 500m² / m³ (typical size: 2m×1m×0.6m, heat dissipation area ≤600m²);

[0006] (2) The heat dissipation efficiency decays: when the fin spacing is less than 2mm, the air side pressure loss increases by 80% and the heat dissipation efficiency decreases by 35% after running in the sand environment for 1000 hours;

[0007] (3) Dynamic response delay: when the unit load suddenly increases from 30% to 100%, the instantaneous peak of oil temperature exceeds 90℃, and the existing air cooler needs more than 10 minutes to balance the temperature rise.

[0008] In summary, the limited space of the mobile gas turbine generator set restricts the cooling capacity of the air cooler, so that the air cooler cannot increase the cooling efficiency by increasing the area, and if the cooling efficiency is increased by increasing the fin density, the heat dissipation efficiency will decay when running in the sand environment, and the air cooler cannot quickly balance the temperature rise when the unit load suddenly increases, therefore, it is obvious that the existing technology cannot further improve the cooling efficiency by using the air cooler for lubricating oil system cooling, and the technical bottleneck of the air cooler in the mobile scene application will lead to poor cooling effect, even cause damage to the equipment parts, affect the overall service life, etc. Practical new type content

[0009] In view of the defects in the prior art, the purpose of the present application is to provide a lubricating oil cooling system for a mobile gas turbine generator set, which greatly reduces the refrigeration capacity requirement of the air-cooled oil cooler, reduces the occupied space, reduces the fan motor energy consumption, effectively recovers the heat dissipation loss of the equipment, and improves the energy conversion efficiency of the equipment.

[0010] To solve the above technical problems, the present application provides a lubricating oil cooling system for a mobile gas turbine generator set, comprising a heat exchanger, a primary temperature control valve, an oil cooler and a secondary temperature control valve.

[0011] The lubricating oil input end of the heat exchanger is connected with the first output end of the lubricating oil circulation system, for conveying high-temperature lubricating oil under operating conditions from the lubricating oil circulation system to the heat exchanger, the lubricating oil output end of the heat exchanger is connected with the first input end of the primary temperature control valve, for conveying the once-cooled lubricating oil obtained by heat exchange of the high-temperature lubricating oil in the heat exchanger to the primary temperature control valve, the fuel input end of the heat exchanger is connected with the first output end of the fuel storage system, for conveying low-temperature fuel under operating conditions from the fuel storage system to the heat exchanger, and the fuel output end of the heat exchanger is connected with the first input end of the fuel combustion system, for conveying the heated fuel obtained by heat exchange of the low-temperature fuel with the high-temperature lubricating oil in the heat exchanger to the fuel combustion system.

[0012] The first output end of the primary temperature control valve is connected with the first input end of the secondary temperature control valve, the second output end of the primary temperature control valve is connected with the input end of the oil cooler, for transporting the primary temperature control lubricating oil from the primary temperature control valve to the oil cooler to obtain secondary temperature control lubricating oil, the output end of the oil cooler is connected with the second input end of the secondary temperature control valve, and the output end of the secondary temperature control valve is connected with the input end of the lubricating oil circulation system.

[0013] The temperature of the low-temperature fuel is lower than the temperature of the high-temperature lubricating oil; the heat exchanger, the primary temperature control valve, the oil cooler, the secondary temperature control valve, the lubricating oil circulation system, the fuel storage system and the fuel combustion system are respectively connected with the control system.

[0014] Further, the second output end of the lubricating oil circulation system is connected with the second input end of the primary temperature control valve, for transporting the low-temperature lubricating oil in the initial start-up condition from the lubricating oil circulation system to the primary temperature control valve; the second output end of the fuel storage system is connected with the second input end of the fuel combustion system, for transporting the low-temperature fuel in the initial start-up condition from the fuel storage system to the fuel combustion system.

[0015] Further, the first input end of the fuel combustion system and the second input end of the fuel combustion system are the same input end or different input ends.

[0016] Further, the first output end of the lubricating oil circulation system and the second output end of the lubricating oil circulation system are the same output end or different output ends.

[0017] Further, the first output end of the primary temperature control valve and the second output end of the primary temperature control valve are the same output end or different output ends.

[0018] Further, the first input end of the primary temperature control valve is provided with a first temperature sensor, and the second input end of the primary temperature control valve is provided with a second temperature sensor; the input end of the oil cooler is provided with a third temperature sensor, and the second input end of the secondary temperature control valve is provided with a fourth temperature sensor; the first input end of the secondary temperature control valve is provided with a fifth temperature sensor, and the output end of the secondary temperature control valve is provided with a sixth temperature sensor; the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are respectively connected with the control system.

[0019] Further, the fuel storage system comprises a fuel storage tank, a fuel metering valve and a solenoid valve, an output end of the fuel storage tank is connected with an input end of the fuel metering valve, an output end of the fuel metering valve is connected with an input end of the solenoid valve, a first output end of the solenoid valve is connected with a fuel input end of the heat exchanger, and a second output end of the solenoid valve is connected with a second input end of the fuel combustion system; the input end of the solenoid valve is provided with a seventh temperature sensor, and the solenoid valve and the seventh temperature sensor are electrically connected with the control system respectively.

[0020] Further, the fuel combustion system comprises a combustion chamber, and a fuel nozzle ring pipe is arranged in the combustion chamber; the fuel output end of the heat exchanger is connected with a first input end of the fuel nozzle ring pipe, and the second output end of the solenoid valve is connected with a second input end of the fuel nozzle ring pipe.

[0021] Wherein, the first input end of the fuel nozzle ring pipe and the second input end of the fuel nozzle ring pipe are the same input end or different input ends.

[0022] Further, the lubricating oil circulation system comprises an oil return pump, a first output end of the oil return pump is connected with a lubricating oil input end of the heat exchanger, and a second output end of the oil return pump is connected with a second input end of the secondary temperature control valve.

[0023] Wherein, the first output end of the oil return pump and the second output end of the oil return pump are the same output end or different output ends.

[0024] Further, the lubricating oil circulation system further comprises a device lubrication point, an output end of the secondary temperature control valve is connected with one end of the device lubrication point, and the other end of the device lubrication point is connected with an input end of the oil return pump.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] (1) by designing a two-stage heat exchange lubricating oil cooling system, the refrigerating capacity demand of the air-cooled oil cooler is greatly reduced, the land occupation of the air-cooled oil cooler is reduced, the fan motor energy consumption of the air-cooled oil cooler is reduced, the problem that the water-cooled oil cooler cannot be used in the area without water source is effectively solved, and the problem that the air-cooled oil cooler cannot be installed on the mobile gas turbine generator set due to the large volume of the air-cooled oil cooler, and the complexity of transportation, installation and connection and the operation cost are increased due to the need of separately arranging the mobile air-cooled oil cooler is avoided.

[0027] (2) By setting a first temperature control valve and a second temperature control valve to realize two-stage lubricating oil cooling system, effectively solve the mobile gas turbine in the initial start and run two working conditions of different fuel flow, heat transfer problem of different temperature, improve the resource utilization, reduce the fuel gasification risk.

[0028] (3) By using low temperature fuel and high temperature lubricating oil for heat exchange, so that the heat of the lubricating oil taken out from the equipment is absorbed by the low temperature fuel through the lubricating oil cooling system and returned to the gas turbine, effectively recovering the heat loss of the equipment, improving the energy conversion efficiency of the equipment, avoiding the problem that more heat needs to be heated in the combustion chamber due to the low storage temperature of the fuel.

[0029] (4) By setting multiple temperature sensors, precise control of the flow of each pipeline is realized, so as to realize precise control of the lubricating oil cooling effect and the fuel heating effect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0031] Figure 1 A structure diagram of a lubricating oil cooling system of a mobile gas turbine generator set is provided for the embodiments of the present application.

[0032] In the drawings:

[0033] 1-heat exchanger; 2-first temperature control valve; 3-solenoid valve; 4-oil cooler; 5-second temperature control valve; 6-fuel metering valve; 7-fuel nozzle ring pipe; 8-oil return pump; 9-equipment lubrication point. DETAILED DESCRIPTION

[0034] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These all belong to the protection scope of the present application.

[0035] EMBODIMENT

[0036] Please refer to Figure 1 The embodiments of the present application provide a lubricating oil cooling system of a mobile gas turbine generator set, which comprises a heat exchanger 1, a first temperature control valve 2, an oil cooler 4 and a second temperature control valve 5.

[0037] The lubricating oil input end of the heat exchanger 1 is connected with the first output end of the lubricating oil circulation system, for conveying the high-temperature lubricating oil under the running condition from the lubricating oil circulation system to the heat exchanger 1; the lubricating oil output end of the heat exchanger 1 is connected with the first input end of the first temperature control valve 2, for conveying the once-cooled lubricating oil obtained after the high-temperature lubricating oil is cooled in the heat exchanger 1 to the first temperature control valve 2; the fuel input end of the heat exchanger 1 is connected with the first output end of the fuel storage system, for conveying the low-temperature fuel under the running condition from the fuel storage system to the heat exchanger 1; and the fuel output end of the heat exchanger 1 is connected with the first input end of the fuel combustion system, for conveying the heated fuel obtained after the low-temperature fuel is heated with the high-temperature lubricating oil in the heat exchanger 1 to the fuel combustion system.

[0038] The first output end of the first temperature control valve 2 is connected with the first input end of the second temperature control valve 5, and the second output end of the first temperature control valve 2 is connected with the input end of the oil cooler 4, for conveying the once-cooled lubricating oil from the first temperature control valve 2 to the oil cooler 4 to obtain the twice-cooled lubricating oil; the output end of the oil cooler 4 is connected with the second input end of the second temperature control valve 5, and the output end of the second temperature control valve 5 is connected with the input end of the lubricating oil circulation system.

[0039] The second output end of the lubricating oil circulation system is connected with the second input end of the first temperature control valve 2, for conveying the low-temperature lubricating oil under the initial starting condition from the lubricating oil circulation system to the first temperature control valve 2; and the second output end of the fuel storage system is connected with the second input end of the fuel combustion system, for conveying the low-temperature fuel under the initial starting condition from the fuel storage system to the fuel combustion system.

[0040] The first input end of the first temperature control valve 2 is provided with a first temperature sensor, and the second input end of the first temperature control valve 2 is provided with a second temperature sensor; the input end of the oil cooler 4 is provided with a third temperature sensor, and the second input end of the second temperature control valve 5 is provided with a fourth temperature sensor; the first input end of the second temperature control valve 5 is provided with a fifth temperature sensor, and the output end of the second temperature control valve 5 is provided with a sixth temperature sensor; and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are electrically connected with the control system respectively.

[0041] The temperature of the low-temperature fuel is lower than the temperature of the high-temperature lubricating oil; the heat exchanger 1, the first temperature control valve 2, the oil cooler 4, the second temperature control valve 5, the lubricating oil circulation system, the fuel storage system and the fuel combustion system are electrically connected with the control system respectively; the first input end of the fuel combustion system and the second input end of the fuel combustion system are the same input end or different input ends; the first output end of the lubricating oil circulation system and the second output end of the lubricating oil circulation system are the same output end or different output ends; and the first output end of the first temperature control valve 2 and the second output end of the first temperature control valve 2 are the same output end or different output ends.

[0042] The liquid temperature of the pipeline is monitored by the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor, and the control system controls the first temperature control valve 2, the electromagnetic valve 3, the oil cooler 4, the second temperature control valve 5, the lubricating oil circulation system, the fuel storage system and the fuel combustion system according to the monitoring result, so that the liquid flow and temperature of each pipeline meet the preset requirements under the corresponding working condition.

[0043] In an optional embodiment, the fuel storage system comprises a fuel storage tank, a fuel metering valve 6 and an electromagnetic valve 3, the output end of the fuel storage tank is connected with the input end of the fuel metering valve 6, the output end of the fuel metering valve 6 is connected with the input end of the electromagnetic valve 3, the first output end of the electromagnetic valve 3 is connected with the fuel input end of the heat exchanger 1, and the second output end of the electromagnetic valve 3 is connected with the second input end of the fuel combustion system; the input end of the electromagnetic valve 3 is provided with a seventh temperature sensor, and the electromagnetic valve 3 and the seventh temperature sensor are respectively electrically connected with the control system;

[0044] The fuel combustion system comprises a combustion chamber, and the combustion chamber is provided with a fuel nozzle ring pipe 7, the fuel output end of the heat exchanger 1 is connected with the first input end of the fuel nozzle ring pipe 7, and the second output end of the electromagnetic valve 3 is connected with the second input end of the fuel nozzle ring pipe 7;

[0045] The lubricating oil circulation system comprises an oil return pump 8, the first output end of the oil return pump 8 is connected with the lubricating oil input end of the heat exchanger 1, and the second output end of the oil return pump 8 is connected with the second input end of the first temperature control valve 2;

[0046] The lubricating oil circulation system further comprises a device lubrication point 9, the output end of the second temperature control valve 5 is connected with one end of the device lubrication point 9, and the other end of the device lubrication point 9 is connected with the input end of the oil return pump 8; optionally, the output end of the second temperature control valve 5 is connected with one end of the device lubrication point 9 through the oil tank, the main oil pump and the oil filter in sequence, and the device lubrication point 9 comprises a device bearing, a device rotor, a device gear and the like;

[0047] The first input end of the fuel nozzle ring pipe 7 and the second input end of the fuel nozzle ring pipe 7 are the same input end or different input ends, and the first output end of the oil return pump 8 and the second output end of the oil return pump 8 are the same output end or different output ends.

[0048] In an optional embodiment, the lubricating oil cooling system can be applied to a mobile gas turbine generator set using liquid ammonia as fuel, and can also be applied to a system using other liquid fuels with low supply liquid temperature.

[0049] In an alternative embodiment, the oil cooler 4 includes, but is not limited to, an air-cooled oil cooler, and if there is a stable low-temperature medium available, a water-cooled oil cooler or other liquid-cooled oil cooler can also be used.

[0050] As shown in Figure 1 In a specific embodiment, the heat exchanger 1 uses a plate heat exchanger, in which the heat exchange medium is liquid ammonia and lubricating oil, and the plate heat exchanger is installed between the liquid ammonia metering valve and the fuel ring pipe;

[0051] The electromagnetic valve 3 uses an electromagnetic three-way valve to control the liquid ammonia to the plate heat exchanger or bypass the plate heat exchanger. When the temperature sensor on the liquid ammonia line (i.e., the seventh temperature sensor) finds that the liquid ammonia temperature is close to the saturation temperature, the control system can control the electromagnetic three-way valve to switch the liquid ammonia to the bypass to avoid further increase in the liquid ammonia temperature.

[0052] The primary temperature control valve 2 receives two routes of lubricating oil from the oil return pump 8 and the plate heat exchanger. The primary temperature control valve 2 automatically distributes the mixing ratio of the two oil routes to the valve outlet according to the set temperature value, with the purpose of keeping the outlet oil temperature near the set value. The primary temperature control valve 2 plays an important role. Taking two typical working conditions of the gas turbine as an example: (1) From the cold start of the gas turbine to the hot state speed-up stage: At the beginning of this stage, the flow of liquid ammonia is low, and the cooling effect is limited, but at this time, the gas turbine is in the process of cold start, and the lubricating oil is still in a low-temperature state. At this time, the primary temperature control valve 2 automatically selects the lubricating oil from the outlet of the oil return pump 8 to flow to the outlet of the primary temperature control valve 2, and the lubricating oil route from the plate heat exchanger is small or even completely closed, thereby avoiding heating of the liquid ammonia by the lubricating oil under low flow; (2) The gas turbine generates power under load: At this stage, the lubricating oil temperature rises, and the liquid ammonia flow increases. The primary temperature control valve 2 will select all the oil source from the plate heat exchanger to the outlet of the primary temperature control valve 2, or select a part of the oil source from the oil return pump 8 and the other part from the plate heat exchanger to the outlet of the primary temperature control valve 2.

[0053] The oil cooler 4 uses a low-capacity air-cooled oil cooler, and its oil source comes from the primary temperature control valve 2, which can be used as a supplementary cooler when the cooling capacity of the liquid ammonia is insufficient.

[0054] The oil source of the secondary temperature control valve 5 has two routes, one from the primary temperature control valve and the other from the air-cooled oil cooler. The secondary temperature control valve 5 controls the mixing ratio of the two oil sources according to the set temperature value, and controls the temperature of the oil source at the outlet of the secondary temperature control valve 5 within the set value range.

[0055] In a specific implementation scenario, the present lubricating oil cooling system is applied to a mobile gas turbine generator set using liquid ammonia fuel as the main fuel.

[0056] The saturation temperature of liquid ammonia at normal pressure is -33℃, and the liquid ammonia is supplied to the combustion chamber of the gas turbine from the storage tank through the liquid ammonia pump, pipeline, valve group and nozzle. In the whole process, the gasification of liquid ammonia should be prevented, that is, the temperature of liquid ammonia at different pressures should be always lower than the saturation temperature, and a certain amount of supercooling margin should be left. The saturation temperature of liquid ammonia at different pressures is shown in Table 1. It can be seen that if the fuel is supplied from the liquid ammonia tank at normal pressure and sprayed into the combustion chamber at a pressure of 40 Bar (ignoring the temperature rise of the liquid ammonia pump), the maximum difference in the saturation temperature is 111℃, and the cooling requirement of the lubricating oil is reduced from 70℃ to 50℃. The low-temperature cold source in this part can be used as the cold source for cooling the lubricating oil, which constitutes the theoretical basis for the feasibility of the present scheme. In addition, the specific heat capacity of liquid ammonia is about 4.7kJ / kg·K. Taking an 8000kW mobile gas turbine generator set as an example, the amount of liquid ammonia used is about 1.4kg / s. If the heat absorbed in the temperature range of -33℃ to 66℃ can be utilized, 4.7×1.4×(66-(-33))=651kW of heat energy can be recovered into the gas turbine, accounting for 8.1% of the rated power generation of the gas turbine.

[0057] Table 1. Liquid ammonia saturation temperature table

[0058] Bar Temperature °C 1.03 -33 10.03 25 20.3 50 30.2 66 40 78 50 89

[0059] Taking an 8000kW mobile gas turbine generator set as an example, the amount of lubricating oil at thermal state is 7kg / s, and the temperature is 70℃.

[0060] Scheme one: if all the oil is cooled to 50℃ in the plate heat exchanger, the cooling capacity is about 250kW, and 1.4kg / s of liquid ammonia needs to be heated from -33℃ to 5℃. There is still a margin of 61℃ from the saturation temperature of 66℃ at the working pressure of 30 Bar. The cooled lubricating oil does not need to pass through the air-cooled oil cooler to meet the use requirements.

[0061] Scheme two: part of the heat of the lubricating oil is cooled by liquid ammonia in the plate heat exchanger, and then further cooled in the air-cooled oil cooler to meet the use requirements. This case can be applied to the storage of liquid ammonia in a liquid ammonia tank at normal temperature, for example, the storage temperature of liquid ammonia is 25℃, the lubricating oil is first cooled to 55℃ in the plate heat exchanger, the cooling capacity is 200kW, the liquid ammonia is heated from 25℃ to 55.4℃, and there is still a margin of more than 10℃ from the saturation temperature of 66℃ at the working pressure of 30 Bar. The 55℃ lubricating oil is further cooled to 50℃ in the air-cooled oil cooler, and the cooling power of the air-cooled oil cooler only needs to be 50kW. From the calculation results of scheme two, it can be seen that the design capacity of the air-cooled oil cooler in the present scheme is reduced by 75% compared with the cooling capacity of the traditional air-cooled oil cooler, which is very remarkable.

[0062] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A lubricating oil cooling system for a mobile gas turbine generator set, characterized by, The heat exchanger (1), the first temperature control valve (2), the oil cooler (4) and the second temperature control valve (5) are connected with the control system. The lubricating oil input end of the heat exchanger (1) is connected with the first output end of the lubricating oil circulation system, for conveying the high-temperature lubricating oil under the running condition from the lubricating oil circulation system to the heat exchanger (1); the lubricating oil output end of the heat exchanger (1) is connected with the first input end of the first temperature control valve (2), for conveying the once-cooled lubricating oil obtained by heat exchange of the high-temperature lubricating oil in the heat exchanger (1) to the first temperature control valve (2); the fuel input end of the heat exchanger (1) is connected with the first output end of the fuel storage system, for conveying the low-temperature fuel under the running condition from the fuel storage system to the heat exchanger (1); and the fuel output end of the heat exchanger (1) is connected with the first input end of the fuel combustion system, for conveying the heated fuel obtained by heat exchange of the low-temperature fuel with the high-temperature lubricating oil in the heat exchanger (1) to the fuel combustion system. The first output end of the first temperature control valve (2) is connected with the first input end of the second temperature control valve (5), the second output end of the first temperature control valve (2) is connected with the input end of the oil cooler (4), for conveying the once-cooled lubricating oil from the first temperature control valve (2) to the oil cooler (4) to obtain the twice-cooled lubricating oil by secondary cooling, the output end of the oil cooler (4) is connected with the second input end of the second temperature control valve (5), and the output end of the second temperature control valve (5) is connected with the input end of the lubricating oil circulation system. The temperature of the low-temperature fuel is lower than that of the high-temperature lubricating oil; the heat exchanger (1), the first temperature control valve (2), the oil cooler (4), the second temperature control valve (5), the lubricating oil circulation system, the fuel storage system and the fuel combustion system are respectively electrically connected with the control system.

2. A lubricating oil cooling system for a mobile gas turbine generator set as set forth in claim 1, wherein, The second output end of the lubricating oil circulation system is connected with the second input end of the first temperature control valve (2), for conveying the low-temperature lubricating oil under the initial start condition from the lubricating oil circulation system to the first temperature control valve (2); and the second output end of the fuel storage system is connected with the second input end of the fuel combustion system, for conveying the low-temperature fuel under the initial start condition from the fuel storage system to the fuel combustion system.

3. A lubricating oil cooling system for a mobile gas turbine generator set as claimed in claim 2, wherein The first input end of the fuel combustion system and the second input end of the fuel combustion system are the same input end or different input ends.

4. A lubricating oil cooling system for a mobile gas turbine generator set as set forth in claim 2, wherein The first output end of the lubricating oil circulation system and the second output end of the lubricating oil circulation system are the same output end or different output ends.

5. A lubricating oil cooling system for a mobile gas turbine generator set as set forth in Claim 2, wherein The first output end of the first temperature control valve (2) and the second output end of the first temperature control valve (2) are the same output end or different output ends.

6. A lubricating oil cooling system for a mobile gas turbine generator set according to any one of claims 2 to 5, characterized in that The first input end of the primary temperature control valve (2) is provided with a first temperature sensor, and the second input end of the primary temperature control valve (2) is provided with a second temperature sensor; the input end of the oil cooler (4) is provided with a third temperature sensor, and the second input end of the secondary temperature control valve (5) is provided with a fourth temperature sensor; the first input end of the secondary temperature control valve (5) is provided with a fifth temperature sensor, and the output end of the secondary temperature control valve (5) is provided with a sixth temperature sensor; the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are electrically connected with the control system respectively.

7. A lubricating oil cooling system for a mobile gas turbine generator set as claimed in claim 6, wherein The fuel storage system includes a fuel storage tank, a fuel metering valve (6) and a solenoid valve (3), the output end of the fuel storage tank is connected with the input end of the fuel metering valve (6), the output end of the fuel metering valve (6) is connected with the input end of the solenoid valve (3), the first output end of the solenoid valve (3) is connected with the fuel input end of the heat exchanger (1), and the second output end of the solenoid valve (3) is connected with the second input end of the fuel combustion system; the input end of the solenoid valve (3) is provided with a seventh temperature sensor, and the solenoid valve (3) and the seventh temperature sensor are electrically connected with the control system respectively.

8. A lubricating oil cooling system for a mobile gas turbine generator set as claimed in claim 7, wherein The fuel combustion system includes a combustion chamber, the combustion chamber is provided with a fuel nozzle ring pipe (7), the fuel output end of the heat exchanger (1) is connected with the first input end of the fuel nozzle ring pipe (7), and the second output end of the solenoid valve (3) is connected with the second input end of the fuel nozzle ring pipe (7). The first input end of the fuel nozzle ring pipe (7) and the second input end of the fuel nozzle ring pipe (7) are the same input end or different input ends.

9. A lubricating oil cooling system for a mobile gas turbine generator set as claimed in claim 8, wherein The lubricating oil circulation system includes an oil return pump (8), the first output end of the oil return pump (8) is connected with the lubricating oil input end of the heat exchanger (1), and the second output end of the oil return pump (8) is connected with the second input end of the primary temperature control valve (2). The first output end of the oil return pump (8) and the second output end of the oil return pump (8) are the same output end or different output ends.

10. A lubricating oil cooling system for a mobile gas turbine generator set as claimed in claim 9, wherein The lubricating oil circulation system further includes a device lubrication point (9), one end of the device lubrication point (9) is connected with the output end of the secondary temperature control valve (5), and the other end of the device lubrication point (9) is connected with the input end of the oil return pump (8).

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