Multifunctional fuel gas preheater

Abstract

The utility model discloses a multifunctional gas preheater, and relates to the technical field of gas power generation. The first heat exchanger is internally provided with a first heat exchange pipe, and a first hot water inlet of the first heat exchanger is communicated with a hot water inlet pipeline through a water inlet side bypass; a first hot water outlet of the first heat exchanger is communicated with a hot water outlet pipeline through a second ball valve and a first control valve; a second heat exchange pipe is arranged in the second heat exchanger, a second hot water inlet of the second heat exchanger is communicated with the hot water inlet pipeline through a fifth ball valve and a second control valve, and a second hot water outlet of the second heat exchanger is communicated with the hot water outlet pipeline through a water outlet side bypass. The problem that the whole heating system is forced to be scrapped due to leakage or damage of a single heat exchanger in the prior art is solved, and the problem that effective adjustment is difficult due to the fact that the temperature of a fuel gas outlet is too high in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas power generation, in particular to a multifunctional gas preheater. Background Art

[0002] Gas turbines in gas-fired power plants generally use natural gas, a mixture of natural gas and hydrogen, or pure hydrogen as fuel, generating heat energy through combustion. The preheating module plays a vital role in this process. It is placed between the power plant's pressure regulating station and the gas turbine. Its main function is to increase the temperature of the gas and efficiently transport the heated gas to the gas turbine to ensure that the gas turbine can start smoothly, accelerate, and operate stably under load. Currently, the preheating module of most gas-fired power plants uses a two-stage temperature heating system consisting of two heat exchangers connected in series. This design aims to significantly increase the temperature of the gas through step-by-step heating.

[0003] However, this series heat exchanger system has two defects that cannot be ignored: first, once any of the heat exchangers leaks or is damaged and loses its working ability, the entire heating system will be paralyzed and can no longer provide gas at a suitable temperature to the gas turbine. In this case, the entire heating system will be scrapped and new equipment will need to be purchased, which will undoubtedly bring huge economic burdens and time costs; second, when the gas outlet temperature is too high, due to the lack of effective regulation means, the gas temperature cannot be accurately controlled to meet the operating requirements of the gas turbine. Utility Model Content

[0004] The purpose of the utility model is to provide a multifunctional gas preheater, which solves the problem that the entire heating system must be scrapped due to leakage or damage of one of the heat exchangers and the problem that effective adjustment cannot be performed when the gas outlet temperature is too high.

[0005] To achieve the above objectives, the technical solution of the present application is: a multifunctional gas preheater, comprising:

[0006] The first heat exchanger has a first heat exchange tube built therein, the first hot water inlet of the first heat exchanger is connected to the hot water inlet pipeline through the water inlet side bypass; the first hot water outlet of the first heat exchanger is connected to the hot water outlet pipeline through the second ball valve and the first control valve;

[0007] The second heat exchanger has a built-in second heat exchange tube. The second hot water inlet of the second heat exchanger is connected to the hot water inlet pipeline through the fifth ball valve and the second control valve. The second hot water outlet of the second heat exchanger is connected to the hot water outlet pipeline through the water outlet side bypass.

[0008] As a preferred solution of the present invention, the first gas inlet of the first heat exchanger is connected to the gas inlet pipeline through the first inlet side bypass, and the first gas outlet of the first heat exchanger is connected to the gas outlet pipeline through the outlet side bypass.

[0009] As a preferred solution of the present invention, the first bypass on the intake side is an intake pipeline provided with a first double-off valve.

[0010] As a preferred solution of the present invention, the outlet side bypass is an outlet pipeline provided with a fourth double-off valve.

[0011] As a preferred solution of the present invention, the second gas inlet of the second heat exchanger is connected to the first gas outlet through the second bypass on the air inlet side, and the second gas outlet of the second heat exchanger is connected to the gas outlet pipeline through the fifth double-blocking valve.

[0012] As a preferred solution of the present invention, the second bypass on the air intake side is a gas pipeline provided with a third double shut-off valve.

[0013] As a preferred solution of the present invention, the water inlet side bypass is a water inlet pipeline provided with a third ball valve and a second control valve.

[0014] As a preferred solution of the present invention, the outlet side bypass is an outlet pipeline provided with a first ball valve and a first control valve.

[0015] As a preferred solution of the present invention, the second gas inlet of the second heat exchanger is connected to the gas inlet pipeline through a second double-blocking valve.

[0016] As a preferred solution of the present invention, the tube-side fluid of the first heat exchanger and the second heat exchanger is hot water, and the shell-side fluid is gas.

[0017] By adopting the above technical solution, the present invention can achieve the following technical effects: a bypass system is provided on the pipeline connecting the two heat exchangers, and this bypass system includes various valves; by operating the valves to open or close, it is possible to freely switch between two operating modes: one is to allow the two heat exchangers to work together in series, and the other is to select one of the heat exchangers to operate independently. This design solves the previous thorny problem of the entire heating system being forced to be scrapped due to leakage or damage to a single heat exchanger, greatly improving the economy and operating efficiency of the system. At the same time, it also effectively solves the previous problem of difficulty in effective regulation due to the excessively high gas outlet temperature, thereby meeting the actual needs under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the multifunctional gas preheater in Example 2 under simultaneous operation of the first heat exchanger and the second heat exchanger;

[0020] Figure 2 This is a schematic diagram of the structure of the first heat exchanger in the multifunctional gas preheater in Example 2 under independent operation;

[0021] Figure 3 This is a schematic diagram of the structure of the second heat exchanger in the multifunctional gas preheater in Example 2 under independent operation;

[0022] Explanation of the sequence numbers in the figure: 1. first heat exchanger; 2. second heat exchanger; 3. first ball valve; 4. first control valve; 5. second ball valve; 6. third ball valve; 7. second control valve; 8. first double-blocking valve; 9. second double-blocking valve; 10. third double-blocking valve; 11. fourth ball valve; 12. fourth double-blocking valve; 13. fifth double-blocking valve; 14. fifth ball valve; 15. second heat exchange tube; 16. first heat exchange tube; 17. second hot water inlet; 18. second gas outlet; 19. second gas inlet; 20. second hot water outlet; 21. first hot water inlet; 22. first gas outlet; 23. first gas inlet; 24. first hot water outlet. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0026] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] Example 1

[0029] This embodiment provides a multifunctional gas preheater, comprising:

[0030] The first heat exchanger has a first heat exchange tube built in. The first hot water inlet of the first heat exchanger is connected to the hot water inlet pipeline through a third ball valve and a second control valve. The first hot water inlet of the first heat exchanger is also connected to the second hot water outlet through a fourth ball valve. The first hot water outlet of the first heat exchanger is connected to the hot water outlet pipeline through the second ball valve and the first control valve. The first gas inlet of the first heat exchanger is connected to the gas inlet pipeline through a first double-blocking valve. The first gas outlet of the first heat exchanger is connected to the gas outlet pipeline through a fourth double-blocking valve.

[0031] The second heat exchanger has a built-in second heat exchange tube. The second hot water inlet of the second heat exchanger is connected to the hot water inlet pipeline through the fifth ball valve and the second control valve, and the second hot water outlet of the second heat exchanger is connected to the hot water outlet pipeline through the first ball valve and the first control valve; the second gas inlet of the second heat exchanger is connected to the first gas outlet through the third double-blocking valve, and the second gas outlet of the second heat exchanger is connected to the gas outlet pipeline through the fifth double-blocking valve; the second gas inlet of the second heat exchanger is also connected to the gas inlet pipeline through the second double-blocking valve.

[0032] It should be noted that the first heat exchanger 1 and the second heat exchanger 2 both have a fixed tube sheet structure. The tube-side fluid of the first heat exchanger 1 and the second heat exchanger 2 is hot water, and the shell-side fluid is gas. After the gas passes through the outer wall of the first heat exchange tube 16 of the first heat exchanger 1 and the second heat exchange tube 15 of the second heat exchanger 2, the hot water flowing through the inside of the first heat exchange tube 16 and the second heat exchange tube 15 heats the gas through heat transfer, thereby increasing the gas temperature.

[0033] Example 2

[0034] This embodiment provides a variable operating condition adjustment method for a multifunctional gas preheater, including a first heat exchanger and a second heat exchanger operating simultaneously, a first heat exchanger operating independently, and a second heat exchanger operating independently;

[0035] like Figure 1 As shown, the hot water circulation regulation mode of the simultaneous operation condition of the first heat exchanger and the second heat exchanger is as follows: the second control valve 7 is opened, the third ball valve 6 is closed, and the fifth ball valve 14 is opened. Hot water flows through the hot water inlet pipeline through the fifth ball valve 14 and then enters the second hot water inlet 17 of the second heat exchanger 2. The hot water flows through the inside of the second heat exchange tube 15 and flows out from the second hot water outlet 20. The first ball valve 3 is closed, and the fourth ball valve 11 is opened. The hot water flows through the pipeline through the fourth ball valve 11 and then enters the first hot water inlet 21. The hot water flows through the inside of the first heat exchange tube 16 and flows out from the first hot water outlet 24. The second ball valve 5 is opened, and the first control valve 4 is opened. The hot water flows through the pipeline through the second ball valve 5 and the first control valve 4 to reach the hot water outlet pipeline for the next cycle.

[0036] The gas circulation regulation method for the simultaneous operation condition of the first heat exchanger and the second heat exchanger is as follows: the second double-blocking valve 9 is closed, the first double-blocking valve 8 is opened, the gas flows through the gas outlet pipeline and through the first double-blocking valve 8 and then enters the first gas inlet 23 of the first heat exchanger 1, the gas flows through the outside of the first heat exchange tube 16 and flows out from the first gas outlet 22, the third double-blocking valve 10 is opened, the gas flows through the pipeline and through the third double-blocking valve 10 and then enters the second gas inlet 19 of the second heat exchanger 2, the gas flows through the outside of the second heat exchange tube 15 and flows out from the second gas outlet 18, the fourth double-blocking valve 12 is closed, the fifth double-blocking valve 13 is opened, the gas flows through the pipeline and through the fifth double-blocking valve 13 to reach the gas outlet pipeline for the next cycle.

[0037] Through the above adjustments, both gas and hot water pass through the first heat exchanger 1 and the second heat exchanger 2 respectively to perform gas circulation heating.

[0038] like Figure 2 As shown, the hot water circulation regulation mode of the independent operation condition of the first heat exchanger is: the second control valve 7 is opened, the third ball valve 6 is opened, the fifth ball valve 14 is closed, and the fourth ball valve 11 is closed. Hot water passes through the hot water inlet pipeline and flows through the second control valve 7 and the third ball valve 6 and then enters the first hot water inlet 21 of the first heat exchanger 1. The hot water flows through the inside of the first heat exchange tube 16 and flows out from the first hot water outlet 24. The first ball valve 3 is closed, the second ball valve 5 is opened, and the first control valve 4 is opened. The hot water flows through the pipeline through the second ball valve 5 and the first control valve 4 to reach the hot water outlet pipeline for the next cycle.

[0039] The gas circulation regulation method of the independent operation condition of the first heat exchanger is: the second double-blocking valve 9 is closed, the first double-blocking valve 8 is opened, the gas passes through the gas inlet pipeline and flows through the first double-blocking valve 8 to enter the first gas inlet 23 of the first heat exchanger 1, the gas flows through the outside of the first heat exchange tube 16 and flows out from the first gas outlet 22, the third double-blocking valve 10 is closed, the fifth double-blocking valve 13 is closed, and the fourth double-blocking valve 12 is opened, and the gas flows through the pipeline through the fourth double-blocking valve 12 to reach the gas outlet pipeline for the next cycle.

[0040] Through the above adjustment, both gas and hot water are separately heated by gas circulation through the first heat exchanger 1, which is suitable for situations where the second heat exchanger 2 leaks or is damaged and cannot work, or the total gas outlet temperature is too high and the outlet temperature needs to be adjusted and the second heat exchanger 2 needs to be shut down.

[0041] like Figure 3As shown, the hot water circulation regulation mode of the second heat exchanger in the independent operation condition is as follows: the second control valve 7 is opened, the third ball valve 6 is closed, and the fifth ball valve 14 is opened. Hot water passes through the hot water outlet pipe and flows through the second control valve 7 and the fifth ball valve 14 and then enters the second hot water inlet 17 of the second heat exchanger 2. The hot water flows through the inside of the second heat exchange tube 15 and flows out from the second hot water outlet 20. The fourth ball valve 11 is closed, the second ball valve 5 is closed, the first ball valve 3 is opened, and the first control valve 4 is opened. The hot water flows through the pipeline, through the first ball valve 3 and the first control valve 4, and reaches the hot water outlet pipe for the next cycle.

[0042] The gas circulation regulation method of the second heat exchanger in the independent operation condition is: the first double-blocking valve 8 is closed, the third double-blocking valve 10 is closed, and the second double-blocking valve 9 is opened. The gas passes through the gas inlet pipeline and flows through the second double-blocking valve 9 to enter the second gas inlet 19 of the second heat exchanger 2. The gas flows through the outside of the second heat exchange tube 15 and flows out from the second gas outlet 18. The fourth double-blocking valve 12 is closed, and the fifth double-blocking valve 13 is opened. The gas passes through the pipeline and flows through the fifth double-blocking valve 13 to reach the gas outlet pipeline for the next cycle.

[0043] Through the above adjustment, both gas and hot water are separately heated by gas circulation through the second heat exchanger 2, which is suitable for situations where the first heat exchanger 1 leaks or is damaged and cannot work, or the total gas outlet temperature is too high and the outlet temperature needs to be adjusted and the first heat exchanger 1 needs to be shut down.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multifunctional gas preheater, characterized in that: include: The first heat exchanger has a first heat exchange tube built therein, the first hot water inlet of the first heat exchanger is connected to the hot water inlet pipeline through the water inlet side bypass; the first hot water outlet of the first heat exchanger is connected to the hot water outlet pipeline through the second ball valve and the first control valve; The second heat exchanger has a built-in second heat exchange tube. The second hot water inlet of the second heat exchanger is connected to the hot water inlet pipeline through the fifth ball valve and the second control valve. The second hot water outlet of the second heat exchanger is connected to the hot water outlet pipeline through the water outlet side bypass.

2. A multifunctional gas preheater according to claim 1, characterized in that: The first gas inlet of the first heat exchanger is connected to the gas inlet pipeline through the first gas inlet side bypass, and the first gas outlet of the first heat exchanger is connected to the gas outlet pipeline through the gas outlet side bypass.

3. A multifunctional gas preheater according to claim 2, characterized in that: The first bypass on the intake side is an intake pipeline provided with a first double-off valve.

4. A multifunctional gas preheater according to claim 2, characterized in that: The gas outlet side bypass is a gas outlet pipeline provided with a fourth double shut-off valve.

5. The multifunctional gas preheater according to claim 1, characterized in that: The second gas inlet of the second heat exchanger is connected to the first gas outlet through the second bypass on the air inlet side, and the second gas outlet of the second heat exchanger is connected to the gas outlet pipeline through the fifth double-blocking valve.

6. A multifunctional gas preheater according to claim 5, characterized in that: The second bypass on the air intake side is a gas pipeline provided with a third double shut-off valve.

7. The multifunctional gas preheater according to claim 1, characterized in that: The water inlet side bypass is a water inlet pipeline provided with a third ball valve and a second control valve.

8. The multifunctional gas preheater according to claim 1, characterized in that: The water outlet side bypass is a water outlet pipeline provided with a first ball valve and a first control valve.

9. The multifunctional gas preheater according to claim 1, characterized in that: The second gas inlet of the second heat exchanger is connected to the gas inlet pipeline through a second double-blocking valve.

10. The multifunctional gas preheater according to claim 1, characterized in that: The tube-side fluid of the first heat exchanger and the second heat exchanger is hot water, and the shell-side fluid is gas.

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