Gas turbine operation regulation and control system utilizing internal air exhaust energy

Abstract

The invention provides a gas turbine regulation and control system utilizing internal air exhaust energy, and relates to the technical field of gas turbines. Comprising an air compressor, a combustion chamber and a turbine which are sequentially communicated, and further comprises an air inlet heating device connected to the air inlet end of the air compressor, an air exhaust heat exchange device with a hot side channel and a cold side channel and a heat dissipation device. An air exhaust pipeline outlet of the air compressor and a cooling pipeline inlet of the turbine are connected to an inlet and an outlet of a hot side channel of the air exhaust heat exchange device respectively. A medium heating loop is formed by cold side channels of the air inlet heating device and the air exhaust heat exchange device; and the heat dissipation device is connected in the medium heating loop in parallel or in series. Energy carried by air exhaust of the air compressor serves as a heat source to heat inlet air, the heat efficiency of the gas turbine running under the partial load working condition in the low-temperature environment is improved, meanwhile, after the air exhaust of the air compressor releases heat, the temperature is reduced, the cooling effect is enhanced, and it is guaranteed that the safe cooling air consumption of hot end components of the gas turbine is reduced; the heat efficiency of the gas turbine is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, in particular to a gas turbine operation regulation system using internal extraction energy. BACKGROUND

[0002] The construction of new power systems needs to consume renewable energy, but the inherent instability of wind, light, water and other renewable energy makes the rapid peak shaving capability of gas turbine power plants a strong guarantee for the construction of new power systems. In order to meet the needs of grid peak shaving, the unit needs to be operated under partial load conditions for a long time, which is generally realized by reducing the opening of the IGV of the compressor inlet guide vane to reduce the mass flow of the compressor inlet, or directly reducing the initial temperature of the gas. Reducing the IGV opening of the gas turbine will lead to a decrease in compressor efficiency, especially when the ambient temperature is low, the air density increases, and the air mass flow increases under the same IGV opening. In order to maintain the initial temperature of the gas, the IGV needs to be further closed, and the compressor efficiency will decrease more significantly; while directly reducing the initial temperature of the gas will lead to a decrease in the overall thermal efficiency of the gas turbine. The above regulation methods will have an adverse effect on the economy of the power plant. In view of this problem, according to the working principle of the gas turbine, moderately increasing the inlet temperature under partial load conditions helps to reduce the mass flow of the inlet, thereby allowing the IGV opening to increase to improve the efficiency of the compressor, while avoiding excessive reduction of the initial temperature of the gas to maintain a higher overall thermal efficiency.

[0003] In addition, modern high-power heavy-duty gas turbines require a large amount of cooling air due to their high initial gas temperature, and this part of cooling air comes from the high-pressure air extracted by the compressor (hereinafter referred to as compressor extraction), with a temperature of more than 300°C. Not only is the cooling effect limited, but it also consumes the working fluid for work, which also has an adverse effect on thermal efficiency to some extent.

[0004] Currently, existing gas turbine inlet heating methods include using flue gas or hot water waste heat to heat the inlet, using external heat sources to heat the inlet, and using high-temperature gas to mix with the gas turbine inlet to heat it. The technical means to improve the cooling effect of cooling air is to apply external coolers to reduce the temperature of the cooling air flow, such as: applying an once-through air cooling system (OTC system) to make the compressor extraction first cooled by the feedwater of the waste heat boiler as a cooling medium, and using a turbine rotor cooling air system (TCA system) to cool the compressor outlet air before injecting it into the gas turbine for rotor cooling. However, there is currently no technical means to combine heating the inlet and reducing the consumption of cooling air.

[0005] The existing patent CN110645101A discloses a constant-temperature air intake system and method for a gas turbine burning synthetic gas, which heats the air entering the compressor through the gas turbine constant-temperature air intake system, avoids the increase of the air mass flow entering the compressor due to the decrease of the ambient temperature, and thus does not need to increase the synthetic gas heat value to keep the turbine exhaust temperature unchanged. The patent adopts the technical scheme of heating the intake air, but the heat source is the tail flue gas of the waste heat boiler, and the use of the compressor extraction air as the heat source to reduce the cooling air consumption of the gas turbine body is not considered, and the thermal efficiency of the gas turbine system still needs to be improved.

[0006] The existing patent CN109812299A discloses a gas turbine turbine rotor cooling method and cooling gas system, which controls the extraction adjusting valve and the feedwater adjusting valve through the control system to adjust to meet the temperature and flow required for cooling the gas turbine turbine blade and disc. The patent does not clearly recycle the waste heat of the cooling gas, and at the same time needs complex feedwater equipment, which increases the initial investment cost and operation and maintenance cost of the system.

[0007] In summary, the above related existing patents do not solve the problems of the existing technology, i.e., the thermal efficiency reduction of the gas turbine under partial load conditions, the large cooling air consumption, and the insufficient cooling effect. SUMMARY

[0008] The main purpose of the present application is to provide a gas turbine operation regulation system using internal extraction energy, which increases the IGV opening to improve the thermal efficiency of the gas turbine under partial load conditions when the ambient temperature is low, enhances the compressor extraction cooling effect, reduces the consumption of the compressor extraction air used as cooling air, and further improves the thermal efficiency of the gas turbine.

[0009] In order to achieve the above purpose, the present application provides a gas turbine operation regulation system using internal extraction energy. The specific technical scheme is as follows:

[0010] A gas turbine regulation system using internal extraction energy, comprising:

[0011] a compressor, a combustion chamber and a turbine connected in sequence;

[0012] an extraction heat exchange device comprising a hot side channel and a cold side channel;

[0013] an intake heating device connected to the intake end of the compressor;

[0014] wherein the compressor and the turbine are connected with the hot side channel of the extraction heat exchange device;

[0015] the intake heating device is connected with the cold side channel of the extraction heat exchange device to form a medium heating loop;

[0016] The system is configured to cool the compressor bleed air through the hot side channel of the bleed heat exchanger, and transfer the absorbed heat to the intake heating device through the cold side channel of the bleed heat exchanger for heating the compressor intake air.

[0017] Further, the system further comprises a heat sink device, the bleed heat exchanger is a medium heat exchanger, the heat sink device and the cold side channel of the medium heat exchanger form a medium heat sink loop, and the medium heat sink loop is arranged in parallel with the medium heating loop.

[0018] Further, the system further comprises a plurality of independent medium heating loops arranged between the intake heating device and the cold side channel of the medium heat exchanger.

[0019] Further, the system further comprises a plurality of first circulating pumps, the first circulating pumps are connected to the medium heating loop and the medium heat sink loop, and the first circulating pumps are used to independently control the opening and closing of the medium heating loop and the medium heat sink and the flow of the heat conduction medium thereof.

[0020] Further, the system further comprises a high-temperature heat source, the bleed heat exchanger is a heat-adding heat pump, the hot side channel of the heat-adding heat pump comprises a high-temperature heat source side and a low-temperature heat source side, the high-temperature heat source is connected to the high-temperature heat source side, and the compressor and the turbine are connected to the low-temperature heat source side.

[0021] Further, the system further comprises a heat sink device, which is connected between the medium outlet of the intake heating device and the inlet of the cold side channel of the heat-adding heat pump.

[0022] Further, the system further comprises a second circulating pump, which is connected between the medium outlet of the heat sink device and the inlet of the cold side channel of the heat-adding heat pump.

[0023] Further, the system further comprises a control valve, which comprises a first main valve, a second main valve and a bypass valve, the first main valve and the second main valve are respectively connected to the medium inlet and the medium outlet close to the intake heating device;

[0024] The bypass is arranged between the outlet of the cold side channel of the heat-adding heat pump and the medium inlet of the heat sink device, and the bypass valve is connected in the bypass.

[0025] Further, when the compressor intake air needs to be heated, the first main valve and the second main valve are opened, and the bypass valve is closed; when the compressor intake air does not need to be heated, the first main valve and the second main valve are closed, and the bypass valve is opened.

[0026] Further, the compressor bleed air outlet comprises a low-pressure bleed air outlet, a medium-pressure bleed air outlet and a high-pressure bleed air outlet, and the low-pressure bleed air outlet, the medium-pressure bleed air outlet and the high-pressure bleed air outlet are connected with the inlets of the hot side channels of the bleed air heat exchange device respectively.

[0027] Further, the turbine cooling air inlet comprises a low-pressure cooling air inlet, a medium-pressure cooling air inlet and a high-pressure cooling air inlet, and the low-pressure cooling air inlet, the medium-pressure cooling air inlet and the high-pressure cooling air inlet are connected with the outlets of the hot side channels of the bleed air heat exchange device respectively.

[0028] Further, a plurality of flow regulating valves are further included, which are connected between the bleed air outlets of the compressor and the inlets of the hot side channels of the bleed air heat exchange device, and the flow regulating valves are used for regulating the flow of the compressor bleed air according to the temperature change of the compressor bleed air.

[0029] Based on the above technical solutions, the present application has at least the following beneficial effects:

[0030] 1. The gas turbine operation control system using internal bleed air energy disclosed in the present application uses compressor bleed air to heat compressor intake air, increases the IGV opening to improve the thermal efficiency of the gas turbine under partial load conditions when the ambient temperature is low, and reduces the compressor bleed air temperature and improves the cooling effect, thereby reducing the cooling air consumption and bringing additional efficiency gain.

[0031] 2. The gas turbine operation control system using internal bleed air energy disclosed in the present application uses a multi-circuit independent control system, adjusts the circulating pump and valve of each flow path to accurately control the intake air heating temperature, adjusts the heating and cooling mode according to the change of the ambient temperature, and maintains the high-efficiency operation of the gas turbine in a wide temperature range from low temperature to normal temperature.

[0032] 3. The gas turbine operation control system using internal bleed air energy disclosed in the present application significantly reduces the temperature of the compressor bleed air after heat exchange, significantly improves the cooling effect when used for cooling turbine blades, reduces the cooling air consumption, simplifies the cooling system structure, and can save the traditional pre-cooling device and reduce the construction cost.

[0033] 4. The gas turbine operation regulation system using internal extraction energy according to the present application can intelligently switch operation modes according to different working conditions by modular flow path design and independent control function: in low temperature environment, the heating circuit is fully opened to maximize the protection of the intake temperature; in normal temperature environment, part or all of the heating circuit is automatically closed to avoid overheating of the heating circuit equipment through the heat dissipation device. This self-adaptive adjustment capability enables the gas turbine to maintain high efficiency operation in a wide temperature range from low temperature to normal temperature. At the same time, the multi-circuit redundant design significantly improves the system reliability, and the heating capacity can still be maintained above 50% when a single flow path fails. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations of the present application and are not intended as an undue limitation of the application. In the drawings:

[0035] Figure 1 FIG. 1 is a schematic diagram of a gas turbine operation regulation system using internal extraction energy according to an embodiment of the present application;

[0036] Figure 2 FIG. 2 is a schematic diagram of a gas turbine operation regulation system using internal extraction energy according to another embodiment of the present application.

[0037] FIG. 1 is a schematic diagram of a gas turbine operation regulation system using internal extraction energy according to an embodiment of the present application; DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with specific embodiments, which should not be understood as limiting the scope of the present application.

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] The gas turbine regulating system using internal extraction energy provided by the application increases the IGV opening to improve the thermal efficiency of the gas turbine operating in the part load condition when the ambient temperature is low, and enhances the extraction cooling effect of the compressor to reduce the consumption of the compressor extraction used as cooling air, and further improves the thermal efficiency of the gas turbine. The regulating system comprises: a compressor, a combustion chamber and a turbine connected in sequence, and further comprises an intake heating device connected to the intake end of the compressor, an extraction heat exchange device having a hot side channel and a cold side channel, and a heat dissipation device. The extraction outlet of the compressor and the cooling inlet of the turbine are respectively connected to the inlet and outlet of the hot side channel of the extraction heat exchange device; the intake heating device and the cold side channel of the extraction heat exchange device constitute a medium heating loop; and the heat dissipation device is connected in parallel or series in the medium heating loop. The application cools the compressor extraction through the hot side channel of the extraction heat exchange device, and the cooled compressor extraction is used to cool the turbine, and the heat conduction medium absorbing the heat of the compressor extraction is transmitted to the intake heating device through the cold side channel of the extraction heat exchange device to heat the intake of the compressor, and the heat dissipation device is used to dissipate heat of the heat conduction medium.

[0041] The application will be described in detail below with reference to the embodiments.

[0042] Embodiment 1

[0043] Referring to Figure 1 The embodiment provides a specific implementation of the gas turbine regulating system using internal extraction energy. The gas turbine regulating system comprises a compressor 1, a combustion chamber 2, a turbine 3, a medium heat exchanger 4, an intake heating device 5, a heat dissipation device 6, a flow regulating valve 7 and a first circulating pump 8. The output end of the compressor 1 is connected to the input end of the combustion chamber 2, the output end of the combustion chamber 2 is connected to the input end of the turbine 3, and the turbine 3 is further connected to a generator, a waste heat boiler, a steam turbine and a chimney (all are conventional settings, not shown in the figure). The output end of the intake heating device 5 is connected to the input end of the compressor 1, the medium heat exchanger 4 is connected between the compressor 1 and the turbine 3 and the intake heating device 5 and the heat dissipation device 6, the compressor 1 and the turbine 3 are connected to the hot side channel of the medium heat exchanger 4, and the intake heating device 5 and the heat dissipation device 6 are connected to the cold side channel of the medium heat exchanger 4.

[0044] Specifically, the compressor 1 is connected with the hot side passage inlet of the medium heat exchanger 4, and the turbine 3 is connected with the hot side passage outlet of the medium heat exchanger 4. A low-pressure bleed air outlet, a medium-pressure bleed air outlet and a high-pressure bleed air outlet are arranged at the low-pressure part, the medium-pressure part and the high-pressure part of the compressor 1 respectively, and the three bleed air outlets are connected with the hot side passage inlet of the medium heat exchanger 4 through independent bleed air pipelines respectively, and a flow regulating valve 7 is arranged in each bleed air pipeline. A low-pressure cooling air inlet, a medium-pressure cooling air inlet and a high-pressure cooling air inlet are arranged at the low-pressure part, the medium-pressure part and the high-pressure part of the turbine 3 respectively, and the three cooling air inlets are connected with the hot side passage outlet of the medium heat exchanger 4 through independent cooling air pipelines respectively. The cooling air pipelines are communicated with the bleed air pipelines of the same pressure level through the medium heat exchanger 4, that is, the compressor bleed air of the low-pressure bleed air pipeline flows into the low-pressure cooling air pipeline after being cooled, the compressor bleed air of the medium-pressure bleed air pipeline flows into the medium-pressure cooling air pipeline after being cooled, and the compressor bleed air of the high-pressure bleed air pipeline flows into the high-pressure cooling air pipeline after being cooled, thereby forming three independent cooling flow paths. A thermocouple and a flowmeter (not shown in the figure) are arranged on the low-pressure cooling air pipeline, the medium-pressure cooling air pipeline and the high-pressure cooling air pipeline respectively, to measure the temperature and flow of the cooling air flowing into the turbine 3, and the opening degree of the flow regulating valve 7 on the low-pressure bleed air pipeline, the medium-pressure bleed air pipeline and the high-pressure bleed air pipeline is adjusted through a fuzzy PID control algorithm, combined with the current gas turbine initial temperature, to realize dynamic adjustment of the cooling air flow.

[0045] Specifically, the heat-conducting medium inlets of the intake air heating device 5 and the heat dissipation device 6 are connected with the cold side passage outlets of the medium heat exchanger 4 through medium pipelines respectively, the heat-conducting medium outlets of the intake air heating device 5 and the heat dissipation device 6 are connected with the cold side passage inlets of the medium heat exchanger 4 through medium pipelines respectively, and a first circulating pump 8 is arranged in each medium pipeline, and the intake air heating device 5 and the heat dissipation device 6 form a medium circulation loop with the medium heat exchanger 4. Three medium heating loops are arranged between the medium heat exchanger 4 and the intake air heating device 5, and one medium heat dissipation loop is arranged between the medium heat exchanger 4 and the heat dissipation device 6. The heat-conducting medium of the medium heat exchanger 4 is heated by the compressor bleed air, enters the intake air heating device 5 to heat the intake air of the compressor 1, and can also flow into the heat dissipation device 6 to release excess heat. The first circulating pump 8 is used to control the opening and closing of each medium circulation loop. A thermocouple and a vortex flowmeter (not shown in the figure) are arranged in the three medium pipelines between the medium heat exchanger 4 and the intake air heating device 5, to measure the temperature and flow of the heat-conducting medium flowing into the intake air heating device 5 respectively, and the first circulating pump 8 is adjusted through a fuzzy PID control algorithm, combined with the current intake air flow of the compressor 1, the ambient temperature and the target intake air temperature, to realize dynamic adjustment of the heat-conducting medium flow in the medium heating loop, and further realize adjustment of the intake air heating temperature.

[0046] Optionally, the medium heat exchanger 4 adopts a plate-fin heat exchanger, the hot side is a 310S stainless steel flow channel, and the cold side is an aluminum alloy flow channel. Efficient heat exchange is achieved through a mixed design of counterflow and crossflow. The extracted air and the heat-conducting medium exchange heat through the counterflow channels separated by aluminum fins. The hot side pressure drop is controlled within 8 kPa to maintain the efficiency of the gas turbine.

[0047] Optionally, the input end of the air inlet heating device 5 is connected to the atmosphere, and the output end is connected to the compressor. Three sections of heat exchange coils are arranged inside along the air flow direction. The three sections of heat exchange coils are located at upstream, midstream and downstream positions, respectively, and are connected to three medium heating loops, respectively. After the air flows into the input end of the air inlet heating device 5, it successively flows through the three sections of heat exchange coils and exchanges heat with the heat exchange coils. The heated air flows out of the output end of the air inlet heating device 5.

[0048] Optionally, the heat dissipation device 6 adopts a closed evaporative cooling tower, and the heat dissipation capacity can be adjusted in the range of 1-5 MW. The heat-conducting medium is reduced by 15-25℃.

[0049] Optionally, the flow regulating valve 7 adopts an electric V-type ball valve, the temperature sensor adopts a K-type thermocouple embedded in the wall of the air extraction pipeline, and a 3-point redundant arrangement is adopted. The flow meter adopts a vortex flow meter.

[0050] Optionally, the circulating pump in the medium heating loop adopts a magnetic drive centrifugal pump, which is controlled in a closed loop through the vortex flow meter in the circulating loop. The circulating pump in the medium heat dissipation loop adopts a turbine type pump, which is automatically started when the heat-conducting medium exceeds the limit.

[0051] The specific working process of the above-mentioned gas turbine regulation and control system using internal air extraction energy is as follows:

[0052] A certain amount of air E1, E2, E3 is extracted through the low-pressure air extraction outlet, the medium-pressure air extraction outlet and the high-pressure air extraction outlet of the compressor 1, respectively. The compressor extraction E1, E2, E3 flows into the medium heat exchanger 4 along the respective air extraction pipelines, releases heat to the heat-conducting medium through the medium heat exchanger 4, and cools down. The flow regulating valve 7 in the air extraction pipeline controls the compressor extraction flow in a closed loop according to the change of the compressor extraction temperature. After the compressor extraction E1, E2, E3 releases heat, the temperature drops, and the low-temperature cooling gas C1, C2, C3 flows out of the medium heat exchanger 4, flows into the low-pressure cooling gas inlet, the medium-pressure cooling gas inlet and the high-pressure cooling gas inlet of the turbine 3 through the cooling gas pipeline, respectively, and cools the hot end components of the gas turbine.

[0053] The heat-conducting medium of the medium heat exchanger 4 is heated and then flows out in four paths. Three of the paths are for the heat-conducting medium to enter the air heating device 5 through the heat-conducting medium inlet of the air heating device 5 to heat the air compressor inlet air. After the heat-conducting medium is heated, it returns to the cold side channel of the medium heat exchanger 4 under the drive of the circulating pump in the medium heating loop to start the next cycle. The medium heat dissipation loop is opened or closed as needed. When the medium heat dissipation loop is opened, part of the heat-conducting medium flows into the heat dissipation device 6 to cool and release excess heat. Then, under the drive of the circulating pump in the medium heat dissipation loop, the heat-conducting medium returns to the cold side channel of the medium heat exchanger 4 to start the next cycle.

[0054] Embodiment 2

[0055] Referring to Figure 2 The embodiment provides another specific implementation of a gas turbine regulation system using internal extraction energy. The difference between this embodiment and the above-mentioned embodiment 1 is that the medium heat exchanger 4 is replaced by a heat-boosting heat pump 9, a high-temperature heat source 10 is added, and the first circulating pump 8 is replaced by a second circulating pump 11, and a control valve 12 is added. The air compressor 1 and the turbine 3 are connected to the low-temperature heat source side of the heat-boosting heat pump 9, and the high-temperature heat source side of the heat-boosting heat pump 9 is connected to the high-temperature heat source 10.

[0056] Specifically, the air compressor 1 is connected to the low-temperature heat source side inlet of the heat-boosting heat pump 9, the turbine 3 is connected to the low-temperature heat source side outlet of the heat-boosting heat pump 9, and three independent cooling flow paths are formed. The corresponding relationship between the extraction air line and the cooling air line is the same as that of embodiment 1. The extracted air of the air compressor 1 is cooled by the heat-boosting heat pump 9 and used to cool the hot end components of the turbine 3. The flow of the extracted air is automatically controlled by the flow regulating valve 7 according to the temperature change of the air extracted by the air compressor. The heat-boosting heat pump 9 includes an absorber, a generator, a condenser, and an evaporator. The generator of the heat-boosting heat pump 9 uses the high-temperature heat source to heat the lithium bromide solution, causing water to evaporate into steam that enters the condenser, while the concentrated lithium bromide solution flows to the absorber. The water vapor in the condenser condenses and releases heat to heat the heat-conducting medium. The liquid water is depressurized by a throttle valve and enters the evaporator. The heat of the low-temperature heat source in the evaporator is absorbed by the liquid water, which evaporates into low-temperature water vapor. The low-temperature steam flows into the absorber and is absorbed by the concentrated lithium bromide solution, releasing heat to further heat the heat-conducting medium. The lithium bromide solution forms a dilute solution and returns to the generator. The heat-boosting heat pump 9 is driven by the high-temperature heat source side to recover heat from the low-temperature heat source and heat the heat-conducting medium in the cold side channel.

[0057] Specifically, the air intake heating device 5 and the heat dissipation device 6 are connected with the cold side channel of the heat-boosting heat pump 9, the outlet of the cold side channel of the heat-boosting heat pump 9 is connected with the heat conducting medium inlet of the air intake heating device 5, the heat conducting medium outlet of the air intake heating device 5 is connected with the heat conducting medium inlet of the heat dissipation device 6, the heat conducting medium outlet of the heat dissipation device 6 is connected with the inlet of the cold side channel of the heat-boosting heat pump 9, and the second circulating pump 11 is connected in the heating flow path between the heat conducting medium outlet of the heat dissipation device 6 and the inlet of the cold side channel of the heat-boosting heat pump 9. The control valve 12 includes a first main path valve, a second main path valve and a bypass valve, the first main path valve and the second main path valve are respectively arranged in the flow path close to the heat conducting medium inlet and the heat conducting medium outlet of the air intake heating device 5, a bypass connecting the flow path of the heat conducting medium inlet of the heat dissipation device 6 is arranged on the outlet flow path of the cold side channel of the heat-boosting heat pump 9, and the bypass valve is arranged in the bypass. The heat-boosting heat pump 9 uses the heat released by the air extraction of the compressor as a heat source to increase the temperature of the heat conducting medium in the cold side channel, the heat conducting medium flows into the air intake heating device 5 to heat the air intake of the compressor, and then flows into the heat dissipation device to release excess heat.

[0058] Optionally, the high-temperature heat source 10 is a small amount of high-pressure water vapor extracted from a waste heat boiler or a small amount of flue gas extracted from a chimney.

[0059] The specific working process of the above-mentioned gas turbine regulation system using internal air extraction energy is as follows:

[0060] A certain amount of air E1, E2 and E3 is extracted through the low-pressure air extraction outlet, the medium-pressure air extraction outlet and the high-pressure air extraction outlet of the compressor 1, and the air extraction E1, E2 and E3 flows into the heat-boosting heat pump 9 along the respective air extraction pipelines to be used as a low-temperature heat source of the heat-boosting heat pump 9 and release heat to be cooled in the heat-boosting heat pump 9. The flow regulating valve 7 in the air extraction pipeline controls and adjusts the air extraction flow of the compressor according to the change of the air extraction temperature of the compressor. After releasing heat, the air extraction E1, E2 and E3 is cooled to become low-temperature cooling air C1, C2 and C3, and flows into the low-pressure cooling air inlet, the medium-pressure cooling air inlet and the high-pressure cooling air inlet of the turbine 3 through the cooling air pipeline to cool the hot end components of the gas turbine.

[0061] The heat-boosting heat pump 9 consumes the heat energy provided by the high-temperature heat source 10 to recover part of the heat from the air extraction E1, E2 and E3 as a low-temperature heat source, and increase the temperature of the heat conducting medium in the cold side channel.

[0062] In a normal working state, the first main valve and the second main valve are kept open, the bypass valve is kept closed, the heat conducting medium flows out of the cold side channel outlet of the heat increasing heat pump 9, enters the air inlet heating device 5 through the heat conducting medium inlet of the air inlet heating device 5, heats the air inlet of the compressor, and after heating, the heat conducting medium flows into the heat dissipating device 6 to release excess heat, and under the driving of the second circulating pump 11, returns to the cold side channel of the heat increasing heat pump 9 to start the next cycle; if the air inlet does not need to be heated, the first main valve and the second main valve are closed, and the bypass valve is opened, the heat conducting medium directly flows into the heat dissipating device 6 to release heat, and finally under the driving of the second circulating pump 11, returns to the cold side channel of the heat increasing heat pump 9 to start the next cycle.

[0063] The above-mentioned gas turbine operation regulation system using internal extraction energy provided by the application uses the energy carried by the compressor extraction to heat the inlet air, maintains a larger IGV opening degree in the part load condition, and improves the thermal efficiency of the gas turbine in the part load condition in the low temperature environment; after the heat release of the compressor extraction, the temperature is reduced, the cooling effect is enhanced, the cooling air consumption of the safe cooling air of the hot end part of the gas turbine is reduced, and the thermal efficiency of the gas turbine is further improved.

[0064] In summary, the above-mentioned gas turbine operation regulation system using internal extraction energy provided by the application has the following beneficial effects:

[0065] 1. The gas turbine operation regulation system using internal extraction energy provided by the application uses the compressor extraction to heat the inlet air, increases the IGV opening degree, improves the thermal efficiency of the gas turbine in the part load condition in the low temperature environment, and reduces the cooling air consumption by reducing the cooling effect of the compressor extraction temperature, thereby bringing additional efficiency gain.

[0066] 2. The gas turbine operation regulation system using internal extraction energy provided by the application uses a multi-loop independent control system, adjusts the circulating pump and valve of each flow path, accurately controls the inlet air heating temperature, adjusts the heating and heat dissipation mode according to the change of the environment temperature, and maintains the high efficiency operation of the gas turbine in a wide temperature range from low temperature to normal temperature.

[0067] 3. The gas turbine operation regulation system using internal extraction energy provided by the application, the temperature of the compressor extraction is significantly reduced after heat exchange, the cooling effect is significantly improved when used for cooling turbine blades, the cooling air consumption is reduced, the cooling system structure is simplified, the traditional pre-cooling device can be omitted, and the construction cost is reduced.

[0068] 4. The application provides a gas turbine operation regulation system using internal air extraction energy. Through modular flow path design and independent control function, the system can intelligently switch operation modes according to different working conditions: in low temperature environment, the heating circuit is fully opened to maximize the protection of the intake temperature; in normal temperature environment, part or all of the heating circuit is automatically closed to avoid overheating of the heating circuit equipment through the heat dissipation device. This self-adaptive adjustment capability enables the gas turbine to maintain high efficiency operation in a wide temperature range from low temperature to normal temperature. At the same time, the multi-circuit redundant design significantly improves the system reliability, and the heating capacity can still be maintained above 50% when a single flow path fails.

[0069] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0070] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0071] It should be noted that in the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

Claims

1. A gas turbine control system utilizing internal extraction energy, characterized in that: include: A compressor (1), a combustion chamber (2) and a turbine (3) connected in sequence; An air extraction heat exchange device, comprising a hot side channel and a cold side channel; an air intake heating device (5), connected to the air intake end of the compressor; wherein the compressor (1) and the turbine (3) are connected to the hot side channel of the air extraction heat exchange device; The air intake heating device (5) is connected to the cold side channel of the air extraction heat exchange device to form a medium heating loop; The system is configured to cool the compressor exhaust air through the hot side channel of the exhaust heat exchange device, and transfer the absorbed heat to the intake air heating device (5) through the cold side channel of the exhaust heat exchange device for heating the compressor intake air.

2. The gas turbine control system utilizing internal exhaust energy according to claim 1, characterized in that: It also includes a heat dissipation device (6), the exhaust heat exchange device is a medium heat exchanger (4), the heat dissipation device (6) and the cold side channel of the medium heat exchanger (4) form a medium heat dissipation loop, and the medium heat dissipation loop is arranged in parallel with the medium heating loop.

3. The gas turbine control system utilizing internal exhaust energy according to claim 2, characterized in that: A plurality of independent medium heating loops are provided between the intake air heating device (5) and the cold side channel of the medium heat exchanger (4).

4. The gas turbine control system utilizing internal exhaust energy according to claim 3, characterized in that: It also includes a plurality of first circulation pumps (8), each of which is connected to the medium heating loop and the medium heat dissipation loop. The first circulation pumps (8) are used to independently control the opening and closing of the medium heating loop and the medium heat dissipation and the flow rate of the heat-conducting medium.

5. The gas turbine control system utilizing internal exhaust energy according to claim 1, characterized in that: The invention also includes a high-temperature heat source (10), the exhaust heat exchange device is a heat-increasing heat pump (9), the hot side channel of the heat-increasing heat pump (9) includes a high-temperature heat source side and a low-temperature heat source side, the high-temperature heat source (10) is connected to the high-temperature heat source side, and the compressor (1) and the turbine (3) are connected to the low-temperature heat source side.

6. The gas turbine control system utilizing internal exhaust energy according to claim 5, characterized in that: It also includes a heat dissipation device (6), which is connected between the medium outlet of the intake air heating device (5) and the cold side channel inlet of the heat-increasing heat pump (9).

7. The gas turbine control system utilizing internal exhaust energy according to claim 6, characterized in that: It also includes a second circulation pump (11), which is connected between the medium outlet of the heat dissipation device (6) and the cold side channel inlet of the heat-increasing heat pump (9).

8. The gas turbine control system utilizing internal exhaust energy according to claim 7, characterized in that: It also includes a control valve (12), the control valve including a first main valve, a second main valve and a bypass valve, the first main valve and the second main valve being connected to a medium inlet and a medium outlet near the intake heating device (5), respectively; A bypass is provided between the cold side channel outlet of the heat-increasing heat pump (9) and the medium inlet of the heat dissipation device (6), and the bypass valve is connected to the bypass.

9. The gas turbine control system utilizing internal exhaust energy according to claim 8, characterized in that: When the compressor intake air needs to be heated, the first main valve and the second main valve are opened, and the bypass valve is closed; when the compressor intake air does not need to be heated, the first main valve and the second main valve are closed, and the bypass valve is opened.

10. The gas turbine control system utilizing internal exhaust energy according to claim 2 or 5, characterized in that: The air extraction outlet of the compressor (1) comprises a low-pressure air extraction outlet, a medium-pressure air extraction outlet and a high-pressure air extraction outlet, and the low-pressure air extraction outlet, the medium-pressure air extraction outlet and the high-pressure air extraction outlet are respectively connected to the inlet of the hot side channel of the air extraction heat exchange device.

11. The gas turbine control system utilizing internal exhaust energy according to claim 9, characterized in that: The cooling air inlet of the turbine includes a low-pressure cooling air inlet, a medium-pressure cooling air inlet and a high-pressure cooling air inlet, and the low-pressure cooling air inlet, the medium-pressure cooling air inlet and the high-pressure cooling air inlet are respectively connected to the outlet of the hot side channel of the exhaust heat exchange device.

12. The gas turbine control system utilizing internal exhaust energy according to claim 10, characterized in that: The invention also includes a plurality of flow regulating valves (7), wherein the flow regulating valves (7) are connected between the exhaust outlet of the compressor (1) and the inlet of the hot side channel of the exhaust heat exchange device, and the flow regulating valves are used to adjust the flow rate of the compressor exhaust according to the temperature change of the compressor exhaust.

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