Gas turbine power plant natural gas supercharger energy utilization system

Abstract

The utility model provides a gas turbine power plant natural gas supercharger energy utilization system which comprises a natural gas supercharger, a surge tank, a starting electric heater, a flow meter, a performance heater, a precision filter and a gas turbine. An outlet of the surge tank is connected with a performance heater after sequentially passing through a starting electric heater and a flow meter; an outlet of the performance heater is connected with the precision filter, and an outlet of the precision filter is connected with the gas turbine. According to the utility model, the precision filter is arranged at the outlet of the front module, and the precision filter adopts a high-temperature filter element, so that high-temperature natural gas can be tolerated, heat utilization is realized, and the filter of the gas turbine body is prevented from being blocked.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy utilization, and in particular relates to an energy utilization system for a natural gas booster in a gas turbine power plant. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Gas turbines (hereinafter referred to as gas turbines) have requirements for natural gas pressure. If the incoming natural gas pressure is lower than the pressure required by the gas turbine, a natural gas booster is required to boost the natural gas to the pressure required by the gas turbine.

[0004] The compression process of natural gas by natural gas booster is similar to adiabatic compression process, and the temperature of natural gas will rise during the compression process. The extent of temperature rise is mainly related to the pressure ratio (compression ratio is the pressure at the outlet of booster divided by the pressure at the inlet of booster). The higher the pressure ratio, the higher the temperature of natural gas at the outlet of booster. The temperature of natural gas at the outlet of booster often exceeds 90℃.

[0005] The natural gas compressed by the supercharger is supplied to the pre-module of the gas turbine. The existing precision filter is arranged at the inlet of the pre-module. The precision filter adopts a normal temperature filter element. The normal temperature filter element can generally withstand a natural gas temperature of 70-80°C. Therefore, the natural gas at the outlet of the supercharger needs to be cooled to 60°C (leaving a certain temperature safety margin) and then supplied to the pre-module.

[0006] A performance heater is installed in the front module to heat the natural gas to 220°C before supplying it to the gas turbine.

[0007] 1. After the natural gas at the outlet of the booster is cooled from 90°C to 60°C, it is heated to 220°C by the performance heater of the front module, wasting this cooling heat.

[0008] 2. The performance heater is usually made of carbon steel and is prone to rust. In the prior art, the fine filter is arranged upstream of the performance heater. The rust from the performance heater cannot pass through the fine filter and directly enters the natural gas pipeline of the gas turbine, causing the filter of the gas turbine body to be blocked. Summary of the invention

[0009] In order to solve the above problems, the utility model proposes an energy utilization system for a natural gas booster in a gas turbine power plant. The utility model provides a precision filter, and the precision filter is provided at the outlet of the front module. The precision filter adopts a high-temperature filter element, which can withstand high-temperature natural gas, realizes heat utilization, and avoids filter clogging of the gas turbine body.

[0010] According to some embodiments, the utility model adopts the following technical solutions:

[0011] A natural gas booster energy utilization system for a gas turbine power plant comprises a natural gas booster, a pressure stabilizing tank, a start-up electric heater, a flow meter, a performance heater, a precision filter and a gas turbine, wherein:

[0012] The outlet of the natural gas booster is connected to a pressure stabilizing tank through a pipeline, and the outlet of the pressure stabilizing tank is connected to a performance heater after passing through a start-up electric heater and a flow meter in sequence;

[0013] The outlet of the performance heater is connected to a precision filter, and the outlet of the precision filter is connected to a combustion engine.

[0014] As an optional embodiment, a high-temperature filter element is provided in the precision filter.

[0015] As an optional embodiment, the performance heater comprises two units, and the two performance heaters are connected in series.

[0016] As an optional embodiment, one of the performance heaters is connected to the water supply pipe and the other performance heater is connected to the water return pipe.

[0017] As an optional embodiment, the precision filters include two units, and the two precision filters are connected in parallel.

[0018] As an optional implementation method, the two precision filters serve as backup for each other, one is put into use and the other is on standby.

[0019] As an optional embodiment, the natural gas booster is provided with a reflux cooler.

[0020] As an optional implementation, the startup electric heater is further connected in parallel with a first bypass, and a ball valve is provided on the first bypass.

[0021] As an optional implementation, the flow meter is further connected in parallel with a second bypass, and a ball valve is provided on the second bypass.

[0022] As an optional implementation, the pressure stabilizing tank is further connected in parallel with a third bypass, and a ball valve is provided on the third bypass.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model sets a precision filter at the outlet of the front module and adopts a high-temperature filter element. The natural gas at the outlet of the natural gas booster enters the front module without being cooled, and the heat energy generated in the process of compressing the natural gas by the booster can be recovered.

[0025] The utility model utilizes a precision filter to filter rust generated by a high-performance heater, thereby solving the problem of filter blockage of a combustion engine body.

[0026] The utility model is provided with a pressure stabilizing tank to solve the problem of the engine tripping caused by the small volume of the pipeline and the large fluctuation rate of the natural gas pressure.

[0027] The utility model introduces a starting electric heater, which solves the problem of discharging the natural gas stored in the pipeline to the air during the starting stage.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0030] Figure 1 is a system structure diagram of this embodiment;

[0031] Among them, 1. Natural gas booster, 2. Reflux cooler, 3. Pressure regulating tank, 4. Starting electric heater, 5. Flow meter, 6. Water supply pipe, 7. Return pipe, 8. Performance heater, 9. Precision filter, 10. Pneumatic regulating valve, 11. Ball valve, 12. Flange, A. Natural gas inlet, B. Gas engine. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0036] Embodiment 1

[0037] A natural gas booster energy utilization system for a gas turbine power plant comprises a natural gas booster 1, a pressure stabilizing tank 3, a start-up electric heater 4, a flow meter 5, a performance heater 8, a precision filter 9 and a gas turbine, wherein:

[0038] The outlet of the natural gas booster 1 is connected to the pressure stabilizing tank 3 through a pipeline, and the outlet of the pressure stabilizing tank 3 is connected to the performance heater 8 after passing through the start-up electric heater 4 and the flow meter 5 in sequence;

[0039] The outlet of the performance heater 8 is connected to the precision filter 9, and the outlet of the precision filter 9 is connected to the combustion engine.

[0040] In this embodiment, a high-temperature filter element is provided in the precision filter 9, and the high-temperature filter element can be an existing product.

[0041] In this embodiment, the performance heaters 8 include two, and the two performance heaters 8 are connected in series, wherein one performance heater 8 is connected to the water supply pipe 6 , and the other performance heater 8 is connected to the return pipe 7 .

[0042] In this embodiment, the precision filter 9 includes two, and the two precision filters 9 are connected in parallel. The two precision filters 9 are standby for each other, one is put into use, and the other is standby.

[0043] In this embodiment, the natural gas booster 1 is provided with a reflux cooler 2 .

[0044] The starting electric heater 4 is also connected in parallel with a first bypass, on which a ball valve 11 is provided; the flow meter 5 is also connected in parallel with a second bypass, on which a ball valve 11 is provided; the pressure stabilizing tank 3 is also connected in parallel with a third bypass, on which a ball valve 11 is provided.

[0045] In the working process of the above system, the incoming natural gas first enters the natural gas booster 1, and the natural gas pressure is boosted to the pressure required by the engine in the booster. As the natural gas pressure increases, the temperature also increases. The aftercooler at the outlet of the booster is eliminated, and only the reflux cooler 2 of the booster is retained (the function of the reflux cooler 2 is to reflux the natural gas when the unit is running at low load). The natural gas pressurized by the booster directly enters the pressure stabilizing tank 3 without cooling, and then passes through the start-up electric heater 4 and the flow meter 5 in sequence before entering the performance heater 8.

[0046] In the performance heater 8, the natural gas is heated by hot water to a set temperature (eg, 220°C), and then flows through the precision filter 9 before entering the combustion engine.

[0047] During the startup phase of the gas turbine, there are requirements for the temperature of the natural gas supplied to the inlet of the front module, and the minimum temperature is generally required to be 15°C. If the startup electric heater 4 is not set in the front module, the equipment at the inlet of the front module is the flow meter 5, and the pipeline between the pressure regulating tank 3 and the flow meter 5 is relatively long, such as more than 200m. For peak-shaving units operating in two shifts, the natural gas in this section of the pipeline is at ambient temperature before the unit is started, which will be lower than 15°C in winter. During the startup phase of the unit, the cold natural gas stored in this section of the pipeline needs to be discharged to the air, wasting a lot of natural gas. This technology introduces a startup electric heater 4. The function of the startup electric heater 4 is to heat the stored gas in this section of the pipeline during the startup phase of the unit (there is no need to discharge the cold natural gas to the air). During the normal operation of the unit, the heater does not work and the natural gas is bypassed.

[0048] The above-mentioned pressure stabilizing tank 3, starting electric heater 4 and flow meter 5 are all provided with bypass.

[0049] The above-mentioned performance heater 8 is connected to the hot water supply and return pipes, and the hot water heats the natural gas to a set temperature.

[0050] The gas turbine has requirements for the pressure fluctuation rate of natural gas, which is generally not greater than 0.5 bar / s. If the pressure fluctuation rate exceeds this value, the gas turbine will trip. This technical solution introduces a pressure stabilizing tank 3 to increase the pipeline volume (i.e., pipe capacity) of the natural gas system, which can solve the problem of large pressure fluctuation rate caused by small pipe capacity.

[0051] The above description is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the utility model without creative labor shall be included in the protection scope of the utility model.

Claims

1. A natural gas booster energy utilization system for a gas turbine power plant, characterized in that: It includes natural gas booster, pressure stabilizing tank, start-up electric heater, flow meter, performance heater, precision filter and gas turbine, among which: The outlet of the natural gas booster is connected to a pressure stabilizing tank through a pipeline, and the outlet of the pressure stabilizing tank is connected to a performance heater after passing through a start-up electric heater and a flow meter in sequence; The outlet of the performance heater is connected to a precision filter, and the outlet of the precision filter is connected to a combustion engine.

2. The energy utilization system of a natural gas booster in a gas turbine power plant as claimed in claim 1, characterized in that: A high-temperature filter element is arranged in the precision filter.

3. The energy utilization system of a natural gas booster in a gas turbine power plant according to claim 1, characterized in that: The performance heaters include two, and the two performance heaters are connected in series.

4. A natural gas booster energy utilization system for a gas turbine power plant as claimed in claim 3, characterized in that: One of the performance heaters is connected to the water supply pipe and the other performance heater is connected to the water return pipe.

5. The energy utilization system of a natural gas booster in a gas turbine power plant as claimed in claim 1, characterized in that: The precision filters include two units, and the two precision filters are connected in parallel.

6. A natural gas booster energy utilization system for a gas turbine power plant as claimed in claim 5, characterized in that: The two precision filters serve as backup for each other, one is put into use and the other is on backup.

7. The energy utilization system of a natural gas booster in a gas turbine power plant as claimed in claim 1, characterized in that: The natural gas booster is provided with a reflux cooler.

8. The energy utilization system of a natural gas booster in a gas turbine power plant as claimed in claim 1, characterized in that: The starting electric heater is also connected in parallel with a first bypass, and a ball valve is arranged on the first bypass.

9. A natural gas booster energy utilization system for a gas turbine power plant as claimed in claim 8, characterized in that: The flow meter is also connected in parallel with a second bypass, and a ball valve is arranged on the second bypass.

10. The energy utilization system of a natural gas booster in a gas turbine power plant as claimed in claim 9, characterized in that: The pressure stabilizing tank is also connected in parallel with a third bypass, and a ball valve is arranged on the third bypass.

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