Natural gas heating system for gas turbine

Abstract

The utility model discloses a natural gas heating system for a gas turbine. The natural gas heating system comprises a plate heat exchanger and a boiler water inlet assembly, the plate heat exchanger comprises a water inlet end, a water return end, an air inlet end and an air outlet end; the boiler water inlet assembly is connected to the water inlet end, and the water return end is connected with a circulating pump. The air outlet end is connected with a first steam turbine condenser and a second steam turbine condenser; the air inlet end is connected with a heat supply steam pipe; the shell-and-tube heater is additionally arranged, steam of the heat supply pipe network is used for heating water so as to heat natural gas, the safety risk problem caused by the fact that a natural gas system does not have a heat source before a unit is started or during shutdown is effectively solved, and it is guaranteed that a gas turbine or a gas-fired boiler can operate safely and stably in the special time periods; reliability and safety of operation of the whole gas turbine system are improved, and equipment faults and potential safety hazards possibly caused by improper temperature are reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine heating technology, and more specifically, to a natural gas heating system for gas turbines. Background Technology

[0002] In the field of gas turbines, this system is particularly suitable for natural gas heating systems required for gas turbine operation. Before unit startup or during shutdown, when there is no conventional heat source for the natural gas system, this system utilizes steam from the heating network to heat the water going to the pressure regulating station via a shell-and-tube heater, thereby heating the natural gas. This ensures the safe operation of the gas turbine or gas boiler, effectively solving the safety risks associated with unit operation when the waste heat boiler's heat output is insufficient. It improves the stability and safety of gas turbine operation and is widely applicable to various gas turbine equipment that uses waste heat boiler tail-end flue gas to heat water circulation and then heat natural gas.

[0003] Currently, the most common natural gas heating method used in the gas turbine field is to heat water using flue gas from a waste heat boiler, forming a hot water circulation system. The natural gas is heated through heat exchange between the hot water and the natural gas to meet the temperature requirements for normal gas turbine operation. This heating method can operate stably during normal unit operation, relying on the waste heat from the flue gas generated by the waste heat boiler to achieve energy recovery and utilization, demonstrating certain economic efficiency and practicality.

[0004] Problems arise before unit startup or during shutdown. At this time, the waste heat boiler is not in operation or has stopped working, and the natural gas system loses its regular heat source supply. In this heat-free situation, if the gas turbine or gas boiler is forcibly started, the natural gas temperature cannot reach the appropriate operating conditions, leading to a series of serious problems. For example, the low-temperature natural gas entering the combustion system may cause unstable combustion, flame fluctuations, or even flameout, thus affecting combustion efficiency and increasing incomplete combustion products. This not only reduces energy utilization efficiency but may also cause environmental pollution. Simultaneously, the unstable combustion process will cause uneven temperature distribution inside the gas turbine or gas boiler, generating significant thermal stress. Over time, this can easily damage equipment components such as the combustion chamber and turbine blades, greatly shortening equipment lifespan, increasing maintenance costs, and in severe cases, even causing safety accidents, threatening personnel and property safety, and in extreme cases, causing pressure regulator ice blockage. Utility Model Content

[0005] To solve at least one of the above-mentioned technical problems, this utility model proposes a natural gas heating system for gas turbines.

[0006] The first aspect of this utility model provides a natural gas heating system for a gas turbine, comprising: a plate heat exchanger for use with a boiler inlet water assembly;

[0007] The plate heat exchanger includes a water inlet, a water return, an air inlet, and an air outlet.

[0008] The boiler water inlet assembly is connected to the water inlet end, and the return water end is connected to a circulation pump;

[0009] The outlet end is connected to a first steam turbine condenser and a second steam turbine condenser.

[0010] The air inlet is connected to a heating steam pipe.

[0011] In a preferred embodiment of the present invention, the boiler water inlet assembly includes a first boiler condensate inlet pipe and a second boiler condensate inlet pipe arranged in parallel; one end of the first boiler condensate inlet pipe and the second boiler condensate inlet pipe are each connected to a water outlet valve, the two water outlet valves are connected to the same pipeline, and a bypass is provided on one side of the pipeline.

[0012] In a preferred embodiment of this utility model, one end of the outlet valve is connected to a regulating valve, one end of the regulating valve is connected to a check valve, one end of the check valve is connected to the inlet end, a bypass valve is provided on the bypass, and the regulating valve and the bypass valve are arranged in parallel.

[0013] In a preferred embodiment of this utility model, the return water end is connected to a first circulation pump and a second circulation pump, and the first circulation pump and the second circulation pump are arranged in parallel.

[0014] In a preferred embodiment of this utility model, a frequency converter is provided on the first circulating pump.

[0015] In a preferred embodiment of the present invention, one end of the first circulating pump and the second circulating pump are connected to a first hot water heat exchanger and a second hot water heat exchanger, and the first hot water heat exchanger and the second hot water heat exchanger are arranged in parallel.

[0016] In a preferred embodiment of this utility model, an expansion tank is connected to the pipeline between the first circulating pump, the second circulating pump, the first hot water heat exchanger, and the second hot water heat exchanger.

[0017] In a preferred embodiment of this utility model, the top of the expansion tank is provided with an exhaust pipe and a demineralized water inlet pipe.

[0018] In a preferred embodiment of this utility model, an overflow pipe is provided below one side of the expansion tank.

[0019] In a preferred embodiment of this utility model, one end of the first hot water heat exchanger and the second hot water heat exchanger are connected to a heating regulating valve group, and one end of the heating regulating valve group is connected to a heating steam pipe.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] This application effectively solves the safety risks caused by the lack of a heat source in the natural gas system before unit startup or during shutdown by adding a shell-and-tube heater to heat water using steam from the heating network. This ensures that the gas turbine or gas boiler can operate safely and stably during these special periods, improves the reliability and safety of the entire gas turbine system, and reduces equipment failures and safety hazards that may be caused by unsuitable temperatures. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, some of the drawings in the following description are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a block diagram of a natural gas heating system for a gas turbine according to an embodiment of the present invention.

[0024] In the diagram: 1. Condensate feed pipe of the first boiler, 2. Condensate feed pipe of the second boiler, 3. Outlet valve, 4. Bypass valve, 5. Regulating valve, 6. Check valve, 7. Plate heat exchanger, 8. First steam turbine condenser, 9. Second steam turbine condenser, 10. Second circulating pump, 11. First circulating pump, 12. Expansion tank, 13. Overflow pipe, 14. Exhaust pipe, 15. Second hot water heat exchanger, 16. First hot water heat exchanger, 17. Heating regulating valve group, 18. Heating steam pipe, 19. Demineralized water inlet pipe. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0028] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0029] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] See Figure 1 As shown, this utility model proposes a natural gas heating system for a gas turbine, including: a plate heat exchanger 7 and a boiler inlet water assembly;

[0033] The plate heat exchanger 7 includes a water inlet, a water return, an air inlet, and an air outlet;

[0034] The boiler inlet water assembly is connected to the inlet end, and the return water end is connected to a circulation pump;

[0035] The outlet end is connected to the first turbine condenser 8 and the second turbine condenser 9;

[0036] The air inlet is connected to a heating steam pipe 18.

[0037] According to an embodiment of the present invention, the boiler water inlet assembly includes a first boiler condensate inlet pipe 1 and a second boiler condensate inlet pipe 2 arranged in parallel; one end of the first boiler condensate inlet pipe 1 and the second boiler condensate inlet pipe 2 are each connected to a water outlet valve 3, the two water outlet valves 3 are connected to the same pipeline, and a bypass is provided on one side of the pipeline.

[0038] According to an embodiment of the present invention, one end of the outlet valve 3 is connected to a regulating valve 5, one end of the regulating valve 5 is connected to a check valve 6, one end of the check valve 6 is connected to the inlet end, and a bypass valve 4 is provided on the bypass. The regulating valve 5 and the bypass valve 4 are connected in parallel.

[0039] According to an embodiment of the present invention, the return water end is connected to a first circulation pump 11 and a second circulation pump 10, and the first circulation pump 11 and the second circulation pump 10 are arranged in parallel.

[0040] According to an embodiment of the present invention, a frequency converter is provided on the first circulating pump 11.

[0041] According to an embodiment of the present invention, a first hot water heat exchanger 16 and a second hot water heat exchanger 15 are connected to one end of the first circulating pump 11 and the second circulating pump 10, and the first hot water heat exchanger 16 and the second hot water heat exchanger 15 are arranged in parallel.

[0042] According to an embodiment of the present invention, an expansion tank 12 is connected to the pipeline between the first circulating pump 11, the second circulating pump 10, the first hot water heat exchanger 16, and the second hot water heat exchanger 15.

[0043] According to an embodiment of the present invention, the top of the expansion tank 12 is provided with an exhaust pipe 14 and a demineralized water inlet pipe 19.

[0044] According to an embodiment of the present invention, an overflow pipe 13 is provided on the lower side of one side of the expansion tank 12.

[0045] According to an embodiment of the present invention, a heating regulating valve group 17 is connected to one end of the first hot water heat exchanger 16 and the second hot water heat exchanger 15, and one end of the heating regulating valve group 17 is connected to the heating steam pipe 18.

[0046] In summary, this application improves upon the addition of a shell-and-tube heater ( Figure 1The areas marked 17 and 18 (in the text) utilize steam from the heating network to heat water, thereby heating natural gas. This effectively solves the safety risks caused by the lack of a heat source in the natural gas system before unit startup or during shutdown, ensuring that the gas turbine or gas boiler can operate safely and stably during these special periods. This improves the reliability and safety of the entire gas turbine system and reduces equipment failures and safety hazards that may be caused by unsuitable temperatures.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0049] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A natural gas heating system for a gas turbine, comprising: Plate heat exchanger for use with boiler inlet water assembly; characterized in that, The plate heat exchanger includes a water inlet, a water return, an air inlet, and an air outlet. The boiler water inlet assembly is connected to the water inlet end, and the return water end is connected to a circulation pump; The outlet end is connected to a first steam turbine condenser and a second steam turbine condenser. The air inlet is connected to a heating steam pipe.

2. The gas turbine natural gas heating system according to claim 1, characterized in that, The boiler inlet water assembly includes a first boiler condensate feed water pipe and a second boiler condensate feed water pipe arranged in parallel. Both the first boiler condensate feed pipe and the second boiler condensate feed pipe are connected to an outlet valve at one end. The two outlet valves are connected to the same pipeline, and a bypass is provided on one side of the pipeline.

3. The gas turbine natural gas heating system according to claim 2, characterized in that, One end of the outlet valve is connected to a regulating valve, one end of the regulating valve is connected to a check valve, one end of the check valve is connected to the inlet, a bypass valve is provided on the bypass, and the regulating valve and the bypass valve are connected in parallel.

4. The gas turbine natural gas heating system according to claim 3, characterized in that, The return water end is connected to a first circulation pump and a second circulation pump, which are arranged in parallel.

5. A natural gas heating system for a gas turbine according to claim 4, characterized in that, The first circulating pump is equipped with a frequency converter.

6. A natural gas heating system for a gas turbine according to claim 4, characterized in that, The first circulating pump and the second circulating pump are connected at one end to a first hot water heat exchanger and a second hot water heat exchanger, and the first hot water heat exchanger and the second hot water heat exchanger are arranged in parallel.

7. A natural gas heating system for a gas turbine according to claim 6, characterized in that, An expansion tank is connected to the pipeline between the first circulating pump, the second circulating pump, the first hot water heat exchanger, and the second hot water heat exchanger.

8. A natural gas heating system for a gas turbine according to claim 7, characterized in that, The expansion tank is equipped with an exhaust pipe and a demineralized water inlet pipe at the top.

9. A natural gas heating system for a gas turbine according to claim 7, characterized in that, An overflow pipe is installed on the lower side of one side of the expansion tank.

10. A natural gas heating system for a gas turbine according to claim 6, characterized in that, The first hot water heat exchanger and the second hot water heat exchanger are connected to a heating regulating valve group at one end, and one end of the heating regulating valve group is connected to a heating steam pipe.

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