WO2018119920A1

WO2018119920A1 - Lng gas turbine and starting system thereof

Info

Publication number: WO2018119920A1
Application number: PCT/CN2016/113137
Authority: WO
Inventors: 胡秀文
Original assignee: 深圳智慧能源技术有限公司
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2018-07-05

Abstract

An LNG gas turbine (10), comprising a combustion chamber (12), a turbine (14), and an air compressor (16). The air compressor (16) is drivingly connected to the turbine (14); the combustion chamber (12) comprises a combustion chamber inlet (22) and a combustion chamber outlet (24); the turbine (14) comprises a turbine inlet (26) and a turbine outlet (28); the turbine inlet (26) is communicated with the combustion chamber outlet (24); the air compressor (16) comprises an air compressor inlet (30) and an air compressor outlet (32); the air compressor inlet (30) is used for receiving air; the air compressor outlet (32) is communicated with the combustion chamber inlet (26). The LNG gas turbine (10) further comprises a natural gas conveying channel (20) for conveying natural gas into the combustion chamber (12), and a natural gas turbine (18). The natural gas turbine (18) is communicated with the natural gas conveying channel (20), so that gaseous natural gas in the natural gas conveying channel (20) produces work in the natural gas turbine (18) and then is introduced into the combustion chamber (12). The natural gas turbine (18) is connected to the air compressor (16), so that the natural gas turbine (18) drives, when rotating in a work-producing process of the natural gas, the air compressor (16) to rotate. Also disclosed is a starting system of the LNG gas turbine (10). The LNG gas turbine (10) uses cold energy of LNG, thereby improving the starting mode of the gas turbine, and improving the efficiency of the gas turbine.

Description

LNG gas turbine and its starting system

Technical field

[0001] The present invention relates to a starting system for a gas turbine, and more particularly to an LNG gas turbine and its starting system.

Background technique

[0002] At present, gas turbine startup is mostly started by a motor, a hydraulic pump is started, or compressed air is started. The auxiliary equipment required for these startup methods consumes a lot of useful work. LNG is environmentally clean and the price is lower. For LNG-burning gas turbines, the huge cold energy contained in LNG itself is a great waste.

In view of this, the present invention proposes a starting system for an LNG gas turbine that can improve the starting mode of a gas turbine.

The present invention also proposes an LNG gas turbine that can improve the starting mode of a gas turbine.

Problem solution

Technical solution

[0005] An LNG gas turbine includes a combustion chamber, a turbine, and a compressor, the compressor being drivingly coupled to the turbine, the combustion chamber including a combustion chamber inlet and a combustion chamber outlet, the turbine including a turbine inlet And a turbine outlet, the turbine inlet being in communication with the combustion chamber outlet, the compressor comprising a compressor inlet and a compressor outlet, the compressor inlet for receiving air, the compressor outlet and the combustion The chamber inlet is in communication, and the LNG gas turbine further includes a natural gas delivery passage for inputting natural gas to the combustion chamber. The LNG gas turbine further includes a natural gas turbine, the natural gas turbine being in communication with the natural gas delivery passage, such that the gaseous natural gas in the natural gas transmission passage is diverted to the combustion chamber after the work is performed in the natural gas turbine, the natural gas A turbine is coupled to the compressor such that the natural gas turbine rotates during the work of the gaseous natural gas to drive the compressor to rotate.

[0006] In an embodiment, the natural gas transmission passage includes a first natural gas transmission line and a second natural gas transmission line connected to the natural gas turbine inlet, and the first natural gas transmission line is provided with a first exchange a heat exchanger, the first heat exchanger is configured to vaporize LNG in the first natural gas transmission pipeline, the second natural gas transmission pipeline is provided with a second heat exchanger, and the second heat exchanger is configured to absorb The heat of the exhaust gas discharged from the turbine vaporizes the LNG in the second natural gas transfer line.

In an embodiment, the first heat exchanger is an air temperature vaporizer.

[0008] In an embodiment, in a startup phase of the LNG gas turbine, the first natural gas transmission line is activated, and when the LNG gas turbine is operated to a predetermined operating point, the first natural gas transmission line is closed, such that The gaseous natural gas in the natural gas transmission passage is only provided by the second natural gas transmission pipeline

[0009] A starting system of an LNG gas turbine, the starting system comprising: a natural gas conveying passage, the natural gas conveying passage includes a first natural gas conveying pipeline, and the first natural gas transmission pipeline is provided with an air temperature vaporizer to enable the LNG vaporization within the natural gas delivery passage; and a natural gas turbine coupled to a compressor drive of the gas turbine, the natural gas turbine including a natural gas turbine inlet and a natural gas turbine outlet, the natural gas turbine inlet Receiving a gaseous natural gas vaporized by the air temperature in the natural gas transmission channel, the gaseous natural gas driving the natural gas turbine to drive the natural gas turbine to rotate to drive the compressor to rotate, the gaseous natural gas After working on the natural gas turbine, the natural gas turbine outlet leads to a combustion chamber of the gas turbine.

[0010] In an embodiment, the natural gas transmission passage includes a second natural gas transmission pipeline connected to the natural gas turbine inlet, and the second natural gas transmission pipeline is provided with a second heat exchanger, the second The heat exchanger is configured to absorb heat of the exhaust gas discharged from the turbine turbine of the gas turbine to vaporize LNG in the second natural gas transmission line, and in the startup phase of the gas turbine, the first natural gas transmission line is activated The gas turbine is operated to a predetermined operating point, the first natural gas transfer line is closed such that gaseous natural gas within the natural gas delivery passage is provided only by the second natural gas transfer line.

[0011] In an embodiment, the first natural gas transfer line and the second natural gas transfer line are connected in parallel between an LNG transfer pump and the natural gas turbine inlet.

[0012] In an embodiment, the natural gas turbine, the gas turbine compressor and the turbine are coaxially driven.

Advantageous effects of the invention

Beneficial effect

[0013] In summary, the present invention provides an LNG gas turbine and its starting system. The LNG gas turbine is in constant The gas turbine core machine is based on the addition of one or more natural gas turbines to the compressor shaft. LNG is first transported to the air-temperature vaporizer through a dedicated transfer pump and is vaporized by air temperature. The vaporized gaseous natural gas is passed into the natural gas turbine to drive the coaxial compressor impeller. After the turbine, the natural gas and compressed air pass into the combustion chamber to burn work. The exhaust gas carries a large amount of heat energy, and some of the heat exchangers exchange heat with the LNG output from the LNG pump to improve the vaporization efficiency and pressure of the LNG and ensure the natural gas. Turbine output power. After the gas turbine is started, the natural gas turbine continues to work on the output shaft to recover the exhaust heat. The invention fully utilizes the cold energy contained in the LNG itself, improves the starting mode of the gas turbine, starts less power consumption, reduces the input of the auxiliary power equipment, improves the fuel utilization rate, reduces pollutant emissions, improves the efficiency of the gas turbine, and saves the use cost.

Brief description of the drawing

DRAWINGS

1 is a simplified schematic view of a LNG gas turbine of the present invention.

Embodiments of the invention

[0015] Before the embodiments are described in detail, it is to be understood that the invention is not limited The invention may be embodied in other ways. Further, it should be understood that the phraseology and terminology used herein are for the purpose of description The words "including", "comprising", "having", and the like, are used in this context to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "a certain component", the present invention does not limit the number of the components to one, and may include a plurality.

As shown in FIG. 1 , the present invention provides an LNG gas turbine 10 including a combustion chamber 12 , a turbine 14 , a compressor 16 , a natural gas turbine 18 , and natural gas transportation for inputting natural gas to the combustion chamber 12 . Channel 20. The compressor 16 is in communication with the combustion chamber 12 for supplying compressed air to the combustion chamber. The turbine 14 is in communication with the combustion chamber 12 for receiving combustion fluid output from the combustion chamber 12. The natural gas turbine 18 is drivingly coupled to the compressor 16 for activation. Compressor 16, compressor 16 is drivingly coupled to turbine 14. In other embodiments, the natural gas turbine 18, compressor 16 and turbine 14 may also be coaxially coupled.

More specifically, the combustion chamber 12 includes a combustor inlet 22 and a combustor outlet 24, the turbine 14 includes a turbine inlet 26 and a turbine outlet 28, and the compressor 16 includes a compressor inlet 30 and a compressor outlet 32, natural gas Turbine 18 A natural gas turbine inlet 34 and a natural gas turbine outlet 36 are included. Wherein, the compressor inlet 30 is for receiving air, the turbine inlet 26 is in communication with the combustor outlet 24, the compressor outlet 32 is in communication with the combustor inlet 22 to provide compressed air, and the natural gas turbine outlet 36 is in communication with the combustor inlet 22.

[0018] The natural gas turbine 18 is in communication with the natural gas delivery passage 20 such that the natural gas in the natural gas delivery passage is diverted to the combustion chamber 12 after work in the natural gas turbine 18 . Specifically, one end of the natural gas delivery passage 20 is connected to an LNG transfer pump 38, and the other end is connected to the natural gas turbine inlet 34. The LNG transfer pump 38 inputs LNG into the natural gas delivery passage 20, and the input LNG is appropriate in the natural gas delivery passage 20. The vaporized gaseous natural gas is transported into the natural gas turbine 18, and the natural gas turbine 18 rotates to drive the compressor 16 connected to the natural gas turbine 18 during the natural gas work. The natural gas after the turbine is passed into the combustion chamber 12 to burn.

[0019] In the illustrated embodiment, the natural gas delivery passage 20 includes a first natural gas delivery line 40 and a second natural gas delivery line 42 disposed in parallel. The first natural gas transfer line 40 is provided with a first heat exchanger 44 for vaporizing the LNG in the first natural gas transfer line 40. In the illustrated embodiment, the first heat exchanger 44 is implemented as an air temperature vaporizer 44 such that the LNG within the first natural gas transfer line 40 can exchange heat with ambient air while vaporizing the LNG. Therefore, the natural gas delivery passage 20, such as the first natural gas delivery line 40, the air temperature vaporizer 44, the natural gas turbine 18, and the LNG delivery pump 38, may constitute a starting system for starting the LNG gas turbine.

[0020] The second natural gas transfer line 42 is provided with a second heat exchanger 46 configured to absorb the thermal energy of the exhaust gas discharged from the turbine 14 to vaporize the LNG in the second natural gas transfer line 42. Specifically, the turbine outlet 28 is in communication with the second heat exchanger 46 such that at least a portion of the exhaust gas exiting the turbine 14 can pass into the second heat exchanger 46 to exchange heat with the LNG within the second natural gas delivery line 42. LNG vaporizes and recovers exhaust heat. The exhaust gas after heat exchange is discharged or further processed.

[0021] In the startup phase of the LNG gas turbine 10, the first natural gas transfer line 40 is activated, the ambient air is used to vaporize the LNG in the air temperature vaporizer 44, and the vaporized gaseous natural gas is passed to the natural gas turbine 18 to drive the compressor 16 to rotate. With compressed air, the LNG gas turbine 10 starts operating; when the LNG gas turbine 10 is operated to a predetermined operating point, the first natural gas transfer line 40 is closed, so that the gaseous natural gas in the natural gas delivery passage 20 is only provided by the second natural gas delivery line 42, The second heat exchanger 46 utilizes the high-temperature exhaust gas of the turbine 14 to vaporize the LNG, and the vaporization efficiency and pressure of the 吋LNG are significantly improved to ensure the natural gas permeability. Flat 18 output power.

In order to facilitate adjustment control of the LNG gas turbine, in one embodiment, the LNG gas turbine 10 further includes a first control valve and a second control valve (not shown) for regulating the output of the gas turbine. The first control valve is used to control the LNG transfer pump 38 to selectively deliver the LNG into the first natural gas transfer line 40 or the second natural gas transfer line 42, or simultaneously into the first natural gas transfer line 40 and the second natural gas transfer line 42. . The second control valve is for controlling the flow of the exhaust gas discharged from the turbine 14 to the second heat exchanger 46.

[0023] More specifically, the first control valve includes a first valve and a second valve, and the first valve is mounted on the first natural gas delivery line 40 to control whether the LNG is delivered into the air temperature vaporizer 44, or to adjust the delivery air temperature. The flow rate of the vaporizer 44; the second valve is mounted on the second natural gas transfer line 42 to control whether the LNG is delivered to the second heat exchanger 46 or to adjust the amount of flow delivered to the second heat exchanger 46. The second control valve is mounted on the line of the turbine outlet 28 in communication with the second heat exchanger 46 to regulate the flow rate of the exhaust gas entering the second heat exchanger 46.

[0024] In some embodiments, the first control valve may also be used to control the output flow of the LNG delivery pump 38.

[0025] The following is a brief introduction to the operation process of the LNG gas turbine.

[0026] After the machine is turned on, the LNG transfer pump 38 is operated first, the first natural gas transfer line 40 is turned on, the second natural gas transfer line 42 is closed, the LNG is introduced into the air temperature vaporizer 44 to exchange heat with the ambient air, and the LNG is absorbed into the ambient air. The heat is vaporized into gaseous natural gas. The LNG vaporized gaseous natural gas is passed into the natural gas turbine 18 to drive the turbine to work, and the compressor 16 is operated to compress the air. The compressed natural gas and the natural gas output from the natural gas turbine are passed into the combustion chamber 12, and the combustion chamber 12 is ignited, and the compressed air is compressed. The natural gas is burned in the combustion chamber 12. The resulting high temperature combustion products enter the turbine 14 to perform work and drive the compressor 16, and a portion of the high temperature exhaust gas from the turbine 14 is passed to the second heat exchanger 46, a portion of which is discharged or further processed. When the LNG gas turbine 10 is operated to a predetermined operating point 吋, such as a self-sustaining state 吋, the first natural gas transfer line 40 is closed, the second natural gas transfer line 42 is activated, and the LNG transfer pump 38 delivers the LNG to the second heat exchanger 46, the LNG and The high temperature exhaust gas heat exchange to the second heat exchanger 46 is passed, and the absorption tail heat energy is vaporized and pressurized in the second heat exchanger 46. The LNG exchanged by the second heat exchanger 46 is more severely vaporized and the pressure is higher. The high-pressure natural gas enters the natural gas turbine 18 to work, and the turbine power is increased, thereby also simultaneously increasing the power of the compressor 16, the combustion chamber 12, and the turbine 14. . The gas turbine is started up, and the LN can be adjusted by controlling the first control valve and the second control valve. G delivers the flow rate and the flow rate of the high temperature exhaust gas that is passed to the second heat exchanger 46, thereby regulating the output power of the gas turbine.

[0027] In the above embodiment, the LNG gas turbine 10 is provided with only one natural gas turbine 18. According to specific implementation requirements, in other embodiments, more than one natural gas turbine may be disposed to further improve the energy utilization rate of the LNG.

In summary, the present invention provides an LNG gas turbine and its starting system. The LNG gas turbine adds one or more natural gas turbines to the compressor shaft based on the conventional gas turbine core machine. LNG is first transported to the air-temperature vaporizer through a dedicated transfer pump and is vaporized by air temperature. The vaporized gaseous natural gas is passed into the natural gas turbine to drive the coaxial compressor impeller. The natural gas and compressed air output from the natural gas turbine are fed into the combustion chamber for combustion. The exhaust gas carries a large amount of heat energy, and a part of the heat exchanger exchanges heat with the LNG output from the LNG pump to improve the vaporization efficiency and pressure of the LNG. The output power of a natural gas turbine. After the gas turbine is started, the natural gas turbine continues to work on the output shaft to recover the exhaust heat. The invention fully utilizes the cold energy contained in the LNG itself, improves the starting mode of the gas turbine, reduces the power consumption, reduces the input of the auxiliary power equipment, improves the fuel utilization rate, reduces the pollutant discharge, improves the efficiency of the gas turbine, and saves the use cost.

[0029] The concepts described herein may be embodied in other forms without departing from the spirit and scope of the invention. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims rather Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

Claim

An LNG gas turbine includes a combustion chamber, a turbine, and a compressor, the compressor being drivingly coupled to the turbine, the combustion chamber including a combustion chamber inlet and a combustion chamber outlet, the turbine including a turbine inlet and a turbine An outlet, the turbine inlet is in communication with the combustion chamber outlet, the compressor includes a compressor inlet and a compressor outlet, the compressor inlet is for receiving air, and the compressor outlet is connected to the combustion chamber inlet The LNG gas turbine further includes a natural gas delivery passage for inputting natural gas to the combustion chamber, further comprising a natural gas turbine, the natural gas turbine being in communication with the natural gas delivery passage, such that the natural gas delivery passage Gaseous natural gas is passed to the combustion chamber after work in the natural gas turbine, and the gaseous natural gas is vaporized by LNG in the natural gas transmission passage, and the natural gas turbine is connected to the compressor to make The natural gas turbine rotates the crucible to drive the compressor to rotate during the work of the natural gas.

The LNG gas turbine according to claim 1, wherein said natural gas delivery passage comprises a first natural gas transmission line and a second natural gas transmission line in communication with said natural gas turbine inlet, said first natural gas transmission line being provided a first heat exchanger, the first heat exchanger is configured to vaporize LNG in the first natural gas transmission pipeline, and the second natural gas transmission pipeline is provided with a second heat exchanger, the second heat exchange The heat configured to absorb the exhaust gas discharged from the turbine enables vaporization of the LNG in the second natural gas transfer line. The LNG gas turbine according to claim 2, wherein said first heat exchanger is an air temperature vaporizer.

The LNG gas turbine according to claim 2 or 3, wherein in the startup phase of the LNG gas turbine, the first natural gas transmission line is activated, and when the LNG gas turbine is operated to a predetermined operating point, the A natural gas transfer line is closed such that gaseous natural gas within the natural gas delivery passage is provided only by the second natural gas transfer line. A starting system for an LNG gas turbine, characterized in that the starting system comprises: a natural gas conveying passage, the natural gas conveying passage comprises a first natural gas conveying pipeline, and the first natural gas conveying pipeline is provided with an air temperature vaporizer to make The LNG in the natural gas transmission channel is vaporized into gaseous natural gas; a natural gas turbine, the natural gas turbine being coupled to a compressor drive of the gas turbine, the natural gas turbine comprising a natural gas turbine inlet and a natural gas turbine outlet, the natural gas turbine inlet for receiving the natural gas delivery passage a gaseous natural gas vaporized by the air temperature, the gaseous natural gas driving the natural gas turbine to drive the natural gas turbine to rotate to drive the compressor to rotate, and the gaseous natural gas is worked on the natural gas turbine From the natural gas turbine outlet to the combustion chamber of the gas turbine.

[Claim 6] The starting system of the LNG gas turbine according to claim 5, wherein the natural gas transmission passage includes a second natural gas transmission line communicating with the natural gas turbine inlet, the second natural gas transmission line Providing a second heat exchanger, the second heat exchanger configured to absorb heat of the exhaust gas discharged from the turbine turbine of the gas turbine to vaporize LNG in the second natural gas transmission line, at the start of the gas turbine a stage, the first natural gas transmission line is started, and when the gas turbine is operated to a predetermined working point, the first natural gas transmission line is closed, so that the gaseous natural gas in the natural gas transmission channel is only transported by the second natural gas Provided by the pipeline.

[Claim 7] The starting system of the LNG gas turbine according to claim 6, wherein:

A natural gas transfer line and a second natural gas transfer line are connected in parallel between an LNG transfer pump and the natural gas turbine inlet.

[Claim 8] The starting system of the LNG gas turbine according to claim 5, wherein the natural gas turbine, the gas turbine compressor, and the turbine are coaxially driven.