Gas turbine cooling system using natural gas cold energy to provide power

Abstract

The invention discloses a gas turbine cooling system using natural gas cold energy to provide power. An extraction opening of a gas compressor communicates with an inlet of a turbine through the shell side of a first rotor air cooler and the shell side of a second rotor air cooler; an outlet of the steam turbine is divided into two paths, one path is communicated with an inlet of the waste heat boiler, the other path is divided into two paths through the pipe side of the ultralow-temperature economizer, one path is communicated with the pipe side of the first rotor air cooler, and the other path is communicated with the pipe side of the first rotor air cooler through the pipe side of the second rotor air cooler. A pipe side outlet of the first rotor air cooler is divided into two paths after passing through the pipe side of the natural gas preheater, one path is communicated with a fifth valve, the other path is communicated with an inlet of a waste heat boiler, and an outlet of the waste heat boiler is communicated with the pipe side of the first rotor air cooler through a fourth valve. And a main steam outlet of the waste heat boiler is communicated with an inlet of the steam turbine. The system can effectively improve waste heat utilization.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy-saving modification of gas turbine, and relates to a gas turbine cooling system using natural gas cold energy as power. BACKGROUND

[0002] Increasing the gas inlet temperature of the gas turbine is an effective measure to improve the performance of the gas turbine. The Mitsubishi M701F3 type gas turbine has reached 1400 DEG C, and the Mitsubishi M701F4 type gas turbine is as high as 1427 DEG C. However, to a great extent, the increase of the gas inlet temperature is limited by the high-temperature strength of the structure of the turbine components of the gas turbine. In order to prevent the high-temperature components in the gas passage from being damaged due to over-temperature and ensure the safety of the operation of the gas turbine, cooling measures need to be taken for the high-temperature components of the gas turbine. The turbine component cooling air of the gas turbine is extracted from the outlet of the compressor of the gas turbine, and after heat exchange with the external cooling medium (through the cooler), it is used to cool the turbine blades and the rotor. The temperature of the air extracted from the outlet of the compressor of the gas turbine reaches 450 DEG C, and needs to be cooled to 200 DEG C to be used as the cooling air of the rotor of the gas turbine. In the M701F3 type gas turbine, the turbine cooling air is cooled by the cooling fan, and three cooling fans are installed at the bottom of the cooler. Due to the low heat exchange efficiency of the air-cooled heat exchanger, the heat efficiency of the unit is low, and a large amount of electric energy needs to be consumed during operation. Therefore, the heat exchange design of the waste heat utilization system needs to be optimized, and there is still potential for waste heat utilization. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a gas turbine cooling system using natural gas cold energy as power, which can effectively improve the waste heat utilization.

[0004] To achieve the above-mentioned purpose, the present application discloses a gas turbine cooling system using natural gas cold energy as power, which comprises a compressor, a first rotor air cooler, a second rotor air cooler, a turbine, a steam turbine, a waste heat boiler, an ultra-low temperature economizer, a natural gas preheater and a fifth valve.

[0005] The air extraction port of the compressor is connected to the inlet of the turbine through the shell side of the first rotor air cooler and the shell side of the second rotor air cooler.

[0006] The outlet of the steam turbine is divided into two paths, one of which is communicated with the inlet of the waste heat boiler, and the other is communicated with the tube side of the ultra-low temperature economizer, and the tube side of the first rotor air cooler. The tube side of the first rotor air cooler is communicated with the tube side of the second rotor air cooler after passing through the tube side of the natural gas preheater, and is divided into two paths, one of which is communicated with the fifth valve, and the other is communicated with the inlet of the waste heat boiler. The outlet of the waste heat boiler is communicated with the tube side of the first rotor air cooler after passing through the fourth valve, and the main steam outlet of the waste heat boiler is communicated with the inlet of the steam turbine.

[0007] The further improvement of the gas turbine cooling system powered by natural gas cold energy provided by the application is that:

[0008] Further, the compressor, the combustion chamber, the natural gas pipeline and the combustion chamber are further included.

[0009] The outlet of the compressor is communicated with the inlet of the combustion chamber, the natural gas pipeline is communicated with the inlet of the combustion chamber through the shell side of the natural gas preheater, the outlet of the combustion chamber is communicated with the inlet of the turbine, and the outlet of the turbine is communicated with the shell side of the ultra-low temperature economizer through the heat releasing side of the waste heat boiler.

[0010] Further, the outlet of the steam turbine is divided into two paths after passing through the condenser and the condensate pump.

[0011] Further, the outlet of the steam turbine is divided into two paths, one of which is communicated with the inlet of the waste heat boiler, and the other is divided into two paths after passing through the tube side of the ultra-low temperature economizer, the first valve, the feed water pump and the second valve, one of which is communicated with the tube side of the first rotor air cooler through the third valve, and the other is communicated with the tube side of the first rotor air cooler through the tube side of the second rotor air cooler.

[0012] Further, the compressor, the turbine and the first generator are coaxially arranged.

[0013] Further, the steam turbine and the second generator are coaxially arranged.

[0014] Further, the low-temperature booster pump, the first natural gas heater, the second natural gas heater, the speed reducer and the natural gas turbine are further included.

[0015] The outlet of the fifth valve is communicated with the inlet of the condenser through the shell side of the second natural gas heater, the low-temperature liquefied natural gas pipeline is communicated with the inlet of the natural gas turbine through the low-temperature booster pump, the tube side of the first natural gas heater and the tube side of the second natural gas heater, and the outlet of the natural gas turbine is communicated with the natural gas pipeline through the shell side of the first natural gas heater.

[0016] Further, the natural gas turbine is connected with the low-temperature booster pump through the speed reducer.

[0017] Further, the natural gas turbine and the feed water pump are coaxially arranged.

[0018] Further, the low temperature booster pump and the feed water pump are arranged on two sides of the natural gas turbine respectively.

[0019] The present application has the following beneficial effects:

[0020] The natural gas cold energy powered combustion engine cooling system in the present application sends the exhaust gas of the turbine into the waste heat boiler for heat recovery, the main steam output by the waste heat boiler enters the steam turbine, the exhaust steam of the steam turbine is condensed and then enters the first rotor air cooler and the second rotor air cooler, and then enters the natural gas preheater for heat exchange and temperature reduction, so as to realize effective recovery of the combustion engine waste heat.

[0021] Further, it is necessary to point out that the feed water output by the natural gas preheater enters the natural gas heater for further heat release, so as to further recover the combustion engine waste heat. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0023] Figure 1 It is a structural diagram of the present application;

[0024] Figure 2 It is a structural diagram of LNG utilization in the present application.

[0025] Among them, 1 is a first valve, 2 is a second valve, 3 is a third valve, 4 is a fourth valve, 5 is a fifth valve, 6 is an ultra-low temperature economizer, 7 is a waste heat boiler, 8 is a condensate pump, 9 is a condenser, 10 is a steam turbine, 11 is a feed water pump, 12 is a first rotor air cooler, 13 is a second rotor air cooler, 14 is a compressor, 15 is a combustion chamber, 16 is a turbine, 17 is a natural gas preheater, 18 is a first generator, 19 is a second generator, 20 is a low temperature booster pump, 21 is a first natural gas heater, 22 is a second natural gas heater, 23 is a speed reducer, and 24 is a natural gas turbine. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it is to be understood that the terms "including" and "comprising" mean the presence of the stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0028] It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this description and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0029] It will be further understood that the terms "and / or," as used in the present application, as well as analogous terms such as "at least one of" and "one or more of," mean any singe one or combination of any two or more of the associated listed items in the "and / or" or analogous term.

[0030] It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements or regions in the present application, these elements should not be limited to these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element without departing from the scope of the present application. Similarly, a second element could be termed a first element without departing from the scope of the present application.

[0031] The word "if' can be interpreted to mean "upon" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting" or "in response to detecting [the stated condition or event]," depending on the context.

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0033] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0034] Embodiment one

[0035] Reference Figure 1 The gas turbine cooling system powered by natural gas cold energy includes a compressor 14, a first rotor air cooler 12, a second rotor air cooler 13, a turbine 16, a steam turbine 10, a waste heat boiler 7, an ultralow-temperature economizer 6, a natural gas preheater 17 and a fifth valve 5. The suction port of the compressor 14 is connected in communication with the inlet of the turbine 16 through the shell side of the first rotor air cooler 12 and the shell side of the second rotor air cooler 13. The outlet of the steam turbine 10 is connected in communication with the inlet of the waste heat boiler 7 in one way, and in another way, is connected in communication with the tube side of the ultralow-temperature economizer 6 in one way and with the tube side of the first rotor air cooler 12 in another way. The tube side outlet of the first rotor air cooler 12 is connected in communication with the tube side of the natural gas preheater 17 in one way and with the fifth valve 5 in another way. The outlet of the waste heat boiler 7 is connected in communication with the tube side of the first rotor air cooler 12 through the fourth valve 4, and the main steam outlet of the waste heat boiler 7 is connected in communication with the inlet of the steam turbine 10.

[0036] Embodiment two

[0037] For further improving the application, the natural gas cold energy powered gas engine cooling system comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5, an ultra-low temperature economizer 6, a waste heat boiler 7, a condensate pump 8, a condenser 9, a steam turbine 10, a feed water pump 11, a first rotor air cooler 12, a second rotor air cooler 13, a compressor 14, a combustion chamber 15, a turbine 16, a natural gas preheater 17, a first generator 18, a second generator 19, a low temperature booster pump 20, a first natural gas heater 21, a second natural gas heater 22, a speed reducer 23 and a natural gas turbine 24.

[0038] The outlet of the compressor 14 is communicated with the inlet of the combustion chamber 15, the natural gas pipeline is communicated with the inlet of the combustion chamber 15 through the shell side of the natural gas preheater 17, the outlet of the combustion chamber 15 is communicated with the inlet of the turbine 16, and the outlet of the turbine 16 is communicated with the shell side of the ultra-low temperature economizer 6 through the heat releasing side of the waste heat boiler 7.

[0039] The gas suction port of the compressor 14 is communicated with the inlet of the turbine 16 through the shell side of the first rotor air cooler 12 and the shell side of the second rotor air cooler 13.

[0040] The outlet of the steam turbine 10 is divided into two routes after the condenser 9 and the condensate pump 8, one of the two routes is communicated with the inlet of the waste heat boiler 7, and the other route is communicated with the tube side of the ultra-low temperature economizer 6, the first valve 1, the feed water pump 11 and the second valve 2, then divided into two routes, one of the two routes is communicated with the tube side of the first rotor air cooler 12 through the third valve 3, and the other route is communicated with the tube side of the first rotor air cooler 12 through the tube side of the second rotor air cooler 13, the outlet of the tube side of the first rotor air cooler 12 is divided into two routes after the tube side of the natural gas preheater 17, one of the two routes is communicated with the fifth valve 5, and the other route is communicated with the inlet of the waste heat boiler 7, the outlet of the waste heat boiler 7 is communicated with the tube side of the first rotor air cooler 12 through the fourth valve 4, and the main steam outlet of the waste heat boiler 7 is communicated with the inlet of the steam turbine 10.

[0041] The compressor 14, the turbine 16 and the first generator 18 are coaxially arranged, and the steam turbine 10 and the second generator 19 are coaxially arranged.

[0042] The working process of the application is as follows:

[0043] Air is compressed by compressor 14 to form compressed air, the compressed air is combusted with natural gas in combustion chamber 15 to generate high-temperature flue gas, the high-temperature flue gas enters turbine 16 to expand and do work, the exhaust gas of turbine 16 enters waste heat boiler 7 to heat boiler feed water, and main steam with different pressure parameters is formed. The main steam enters steam turbine 10 to expand and do work, the exhaust steam of steam turbine 10 enters condenser 9 to form condensate water, and then the condensate water enters waste heat boiler 7 through condensate pump 8 to form a steam-water cycle, and the heat of condenser 9 is taken away by circulating water.

[0044] The cold end medium of the water-cooled cooling compressor air extraction and turbine rotor cooler (hereinafter referred to as “TCA”) is high-pressure feed water, the condensate water output from condensate pump 8 enters ultra-low-temperature economizer 6 to absorb the tail flue gas waste heat of waste heat boiler 7, the temperature of the tail flue gas is 60-100 DEG C, the higher the load of the gas turbine is, the higher the tail flue gas temperature of waste heat boiler 7 is, and the more obvious the energy-saving effect after waste heat utilization is, after heating by ultra-low-temperature economizer 6, the first valve 1 is driven by feed water pump 11 to be boosted to high-pressure feed water, and then the second valve 2 enters the turbine rotor cooler to exchange heat, at this time, the fourth valve 4 is in the closed state, the high-pressure feed water enters the second rotor air cooler 13 and the first rotor air cooler 12 to cool, the feed water bypass is arranged between the first rotor air cooler 12 and the second rotor air cooler 13, which is used for adjusting the inlet and outlet water temperature of the air cooler, so as to control the heat exchange end difference, and prevent the heat exchanger from deforming, working medium leaking and other faults under the condition of long-time large end difference. The high-pressure feed water is heated to 300-350 DEG C after absorbing the air extraction heat of compressor 14, and then enters natural gas preheater 17 to preheat the natural gas to 140-210 DEG C, according to the corresponding natural gas temperature curve under different loads, the natural gas is heated to the target temperature, after a series of flow and heat exchange, part of the feed water after temperature and pressure reduction enters the medium-pressure drum, and the other part enters the subsystem through the fifth valve 5.

[0045] Example three

[0046] On the basis of example two, reference Figure 2 The application also includes low-temperature booster pump 20, first natural gas heater 21, second natural gas heater 22, speed reducer 23 and natural gas turbine 24.

[0047] The outlet of the fifth valve 5 is connected with the inlet of the condenser 9 through the shell side of the second natural gas heater 22, the low-temperature liquefied natural gas pipeline is connected with the inlet of the natural gas turbine 24 through the low-temperature booster pump 20, the tube side of the first natural gas heater 21 and the tube side of the second natural gas heater 22, the outlet of the natural gas turbine 24 is connected with the natural gas pipeline through the shell side of the first natural gas heater 21, and the low-temperature booster pump 20, the speed reducer 23, the natural gas turbine 24 and the feed water pump 11 are coaxially arranged.

[0048] Since the feed water still has a high temperature after flowing out of the natural gas preheater 17, the temperature is 180-230℃, in order to make full use of the waste heat of the feed water and the cold energy of the liquefied natural gas, the application sets up a "one drives two" power system, that is, the waste heat of the feed water and the cold energy of the liquefied natural gas are used to drive the natural gas turbine 24 to drive the feed water pump 11 and the low-temperature booster pump 20, so that the power consumption caused by the motor driving the pump is reduced.

[0049] Reference Figure 2 The specific working process of the embodiment is as follows: the low-temperature liquefied natural gas (-160℃) is pressurized to 4-5MPa by the low-temperature booster pump 20, then absorbs the waste heat of the exhaust gas of the natural gas turbine 24 through the first natural gas heater 21, and absorbs the waste heat of the feed water, so that the temperature of the feed water is reduced to 20-30℃, and the feed water flows into the hot well of the condenser 9. The temperature of the natural gas after passing through the second natural gas heater 22 reaches 90-110℃, and the natural gas enters the natural gas turbine 24 to expand and do work. The system automatically adjusts the amount of feed water according to the work requirement of the feed water pump 11 and the low-temperature booster pump 20, so that the work of the natural gas turbine 24 and the power consumption of the feed water pump 11 and the low-temperature booster pump 20 are balanced, and this function is realized by controlling the opening of the fifth valve 5. The outlet temperature of the natural gas after expansion of the natural gas turbine 24 is 50-60℃, and the pressure is reduced to 2.5-3MPa. At this time, the parameters match the pressure of the gas turbine natural gas inlet, but the temperature is slightly higher than the required temperature 20-30℃ of the natural gas dew point heater inlet. The temperature of the natural gas is reduced to 20-30℃ by the first natural gas heater 21 to form normal temperature natural gas. The normal temperature natural gas is heated to the required temperature of the natural gas inlet under different loads of the gas turbine by another part of the feed water, and the temperature is between 140-210℃. The setting of the first natural gas heater 21 avoids great interference to the working state of the subsequent other equipment, and prevents the gas turbine inlet natural gas temperature from being too high to cause the gas turbine to trip. The low-temperature booster pump 20 and the feed water pump 11 are arranged on both sides of the natural gas turbine 24. The natural gas turbine 24 and the feed water pump 11 are coaxially arranged, and the rotation speeds of the two are the same. The low-temperature booster pump 20 and the natural gas turbine 24 are connected by a speed reducer 23. Because the lift of the low-temperature booster pump 20 is small, the speed reducer 23 is set to control the rotation speed of the low-temperature booster pump 20, and then control the outlet pressure of the liquefied natural gas.

[0050] It needs to be explained that the present application is improved for the air cooling system of Mitsubishi M701F4 type gas turbine unit, the air from the compressor 14 is cooled by the feed water in stages, and two air cooling operation modes are designed for the gas turbine, one is used and one is reserved to ensure that the gas turbine rotor can be cooled when one of the cooling systems fails during the operation of the unit, and the dangerous working condition of over-temperature does not occur. The heat-absorbed feed water is used to heat the natural gas, and then the natural gas is combusted in the gas turbine to do work, in addition, the cold energy of the liquefied natural gas is used to absorb the waste heat of the feed water, and the feed water pump 11 and the low-temperature booster pump 20 are driven by the natural gas turbine 24, so that the thermal efficiency of the unit is improved, and the energy-saving effect is remarkable.

[0051] The present application has the characteristics of strong operability, flexible operation mode, remarkable energy-saving effect, high unit operation safety and the like.

[0052] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0053] It should be understood that the present application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present application. The scope of the present application is limited only by the appended claims.

[0054] The above description is only the preferred embodiment of the present application, and does not make any limitation on the present application, and any simple modification, change and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A combustion engine cooling system powered by natural gas cooling energy, characterized in that: It includes a compressor (14), a first rotor air cooler (12), a second rotor air cooler (13), a turbine (16), a steam turbine (10), a waste heat boiler (7), a super-low temperature economizer (6), a natural gas preheater (17) and a fifth valve (5); The air extraction port of the compressor (14) is connected to the inlet of the turbine (16) through the shell side of the first rotor air cooler (12) and the shell side of the second rotor air cooler (13); The outlet of the steam turbine (10) is divided into two paths, one of which is connected to the inlet of the waste heat boiler (7), and the other is divided into two paths through the tube side of the ultra-low temperature economizer (6), one of which is connected to the tube side of the first rotor air cooler (12), and the other is connected to the tube side of the first rotor air cooler (12) through the tube side of the second rotor air cooler (13). The tube side outlet of the first rotor air cooler (12) is divided into two paths after passing through the tube side of the natural gas preheater (17), one of which is connected to the fifth valve (5), and the other is connected to the inlet of the waste heat boiler (7). The outlet of the waste heat boiler (7) is connected to the tube side of the first rotor air cooler (12) through the fourth valve (4). The main steam outlet of the waste heat boiler (7) is connected to the inlet of the steam turbine (10).

2. The combustion engine cooling system using natural gas cold energy to provide power according to claim 1, characterized in that: It also includes a compressor (14), a combustion chamber (15), a natural gas pipeline and a combustion chamber (15); The outlet of the compressor (14) is connected to the inlet of the combustion chamber (15), the natural gas pipeline is connected to the inlet of the combustion chamber (15) through the shell side of the natural gas preheater (17), the outlet of the combustion chamber (15) is connected to the inlet of the turbine (16), and the outlet of the turbine (16) is connected to the shell side of the ultra-low temperature economizer (6) through the heat release side of the waste heat boiler (7).

3. The combustion engine cooling system powered by natural gas cold energy according to claim 1, characterized in that: The outlet of the steam turbine (10) is divided into two paths after passing through the condenser (9) and the condensate pump (8).

4. The combustion engine cooling system powered by natural gas cold energy according to claim 2, characterized in that: The outlet of the steam turbine (10) is divided into two paths, one of which is connected to the inlet of the waste heat boiler (7), and the other is divided into two paths after passing through the tube side of the ultra-low temperature economizer (6), the first valve (1), the feed water pump (11) and the second valve (2). One of the paths is connected to the tube side of the first rotor air cooler (12) through the third valve (3), and the other path is connected to the tube side of the first rotor air cooler (12) through the tube side of the second rotor air cooler (13).

5. The combustion engine cooling system powered by natural gas cold energy according to claim 1, characterized in that: The compressor (14), the turbine (16) and the first generator (18) are coaxially arranged.

6. The combustion engine cooling system powered by natural gas cold energy according to claim 1, characterized in that: The steam turbine (10) and the second generator (19) are coaxially arranged.

7. The combustion engine cooling system powered by natural gas cold energy according to claim 4, characterized in that: It also includes a low-temperature boost pump (20), a first natural gas heater (21), a second natural gas heater (22), a speed reducer (23) and a natural gas turbine (24); The outlet of the fifth valve (5) is connected to the inlet of the condenser (9) via the shell side of the second natural gas heater (22); the low-temperature liquefied natural gas pipeline is connected to the inlet of the natural gas turbine (24) via the low-temperature booster pump (20), the tube side of the first natural gas heater (21), and the tube side of the second natural gas heater (22); and the outlet of the natural gas turbine (24) is connected to the natural gas pipeline via the shell side of the first natural gas heater (21).

8. The combustion engine cooling system powered by natural gas cold energy according to claim 7, characterized in that: The natural gas turbine (24) is connected to the low-temperature boost pump (20) via a speed reducer (23).

9. The combustion engine cooling system powered by natural gas cold energy according to claim 7, characterized in that: The natural gas turbine (24) and the water feed pump (11) are coaxially arranged.

10. The combustion engine cooling system powered by natural gas cold energy according to claim 7, characterized in that: The low-temperature boost pump (20) and the feed water pump (11) are respectively arranged on both sides of the natural gas turbine (24).

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