An intake air temperature control system driven by the sensible heat of compressor extraction.

Abstract

This invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction, relating to the field of gas turbine technology. It includes: a compressor, a combustion chamber, and a turbine connected in sequence; a chiller, including a heat source end and a cooling output end; a heat exchanger, including a hot-side channel and a cold-side channel; and an intake air temperature control heat exchanger, including a control side and an air side, with the air side connected to the compressor's intake pipeline. The chiller is connected between the compressor, the turbine, and the intake air temperature control heat exchanger to form a turbine cooling and intake air cooling circuit; the heat exchanger is connected between the compressor, the turbine, and the intake air temperature control heat exchanger to form a turbine cooling and intake air heating circuit. This system cools the turbine after the compressor extraction air is cooled, enhancing the cooling effect. Simultaneously, the compressor extraction air serves as a heat source to drive the preparation of a cooling or heating working fluid, and the compressor intake air temperature is controlled by adjusting the working fluid flow rate.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, specifically to an intake air temperature control system driven by the sensible heat of compressor extraction. Background Technology

[0002] Heavy-duty gas turbines, as large power units widely used in power generation, rely on increasing compressor pressure ratio and gas inlet temperature for their core performance indicators—output power and system cycle thermal efficiency. Therefore, raising the gas inlet temperature is a crucial way to improve gas turbine performance. However, during gas turbine operation, the operating temperature of hot-end components is extremely high, far exceeding the melting point of current high-temperature alloys. During startup and shutdown, these components will experience thermal shock due to drastic temperature changes. Furthermore, increasing the gas inlet temperature will further deteriorate the operating environment of the hot-end components, shorten their lifespan, and reduce reliability. Therefore, while increasing the gas inlet temperature, reliable cooling technologies must be implemented to maintain the operating temperature of the hot-end components within a safe range.

[0003] Currently, mainstream international commercial heavy-duty gas turbine models primarily control the temperature of hot-end components by directly extracting compressed air from the compressor and using it as a cooling medium. The air source is high-pressure air extracted from each stage of the compressor. This high-pressure air itself has a high temperature (approximately 300°C), and its cooling effect is not ideal when used directly as a cooling medium. With advancements in gas turbine technology, compressor pressure ratios have continuously increased, leading to a continuous rise in the temperature of the compressed air used as a cooling medium and an increasing demand for cooling air. The benefits gained from increasing the initial gas temperature are consumed by the ever-increasing volume of cooling air extracted. Furthermore, the technology of extracting compressed air for cooling also has its shortcomings. When the ambient temperature exceeds ISO conditions, the mass flow rate of air entering the compressor decreases, causing the compressor to deviate from its design operating conditions. This results in a decrease in the mass flow rate of extracted air at each stage, an increase in the extraction air temperature, and a deterioration in cooling efficiency. Therefore, directly using high-pressure air extracted from each stage of the compressor as a cooling medium is no longer sufficient to address the challenges posed by the ever-increasing initial gas temperature to the cooling technology of hot-end components.

[0004] To address this technical challenge, most heavy-duty gas turbines use the extracted high-pressure air directly as the cooling medium, requiring the use of superior heat-resistant alloy materials. Another approach is to use an external cooler to cool the extracted air before reinjecting it into the turbine to cool high-temperature components. For example, the ALSTOM GT26 series uses a single-pass air cooling system (OTC system) with waste heat boiler feedwater as the cooling medium, which first cools the compressor-extracted air before using it as the cooling medium. The Mitsubishi M701F model uses a turbine rotor cooling air system (TCA system) to cool the compressor outlet air before reinjecting it into the turbine for rotor cooling. While external coolers can effectively reduce the compressor extraction temperature, their applicability is limited in simple gas turbine cycles where the waste heat boiler and turbine are not operational, thus lacking a suitable cooling medium.

[0005] Water vapor has advantages such as wide availability, reusability, and higher heat capacity and lower viscosity compared to air. Whether used alone as a cooling medium or mixed with cooling air as a composite cooling medium, its cooling effect is improved compared to pure air. However, on the one hand, due to the significant change in the composition of the cooling medium, the cooling structure and materials of the hot-end components need to be adapted, increasing the design difficulty and making it impossible to upgrade existing models, thus making application difficult. On the other hand, the steam used for cooling needs to be set up with a separate cooling circuit to avoid steam leakage during the cooling flow process, which affects the operational flexibility of the combined cycle unit.

[0006] Furthermore, ambient temperature fluctuations are a common challenge in the actual operation of gas turbines, directly causing the compressor inlet temperature to deviate from the design value. This instability in inlet temperature has multiple negative impacts on unit performance: on the one hand, high-temperature environments lead to reduced inlet air density and mass flow rate, forcing the compressor to operate under off-design conditions, resulting in reduced efficiency and a smaller surge margin. To maintain power output, the turbine inlet temperature needs to be increased, exacerbating the thermal load on hot-end components. On the other hand, while low-temperature environments may improve the surge margin, excessively high air mass flow rates can also cause the compressor to deviate from its high-efficiency range and may lead to overload of downstream components. The passive fluctuations in inlet temperature and the resulting efficiency losses and operational risks have become a core problem in existing gas turbine technology that urgently needs to be addressed but has not yet received sufficient attention or effective solutions.

[0007] Existing patent CN110645101A discloses a constant-temperature air intake system and method for a syngas-burning gas turbine. This system heats the air entering the compressor, preventing an increase in the air mass flow rate into the compressor due to a decrease in ambient temperature. This eliminates the need to increase the calorific value of the syngas to maintain a constant turbine exhaust temperature. While this patent employs a heated air intake solution, the heat source is the flue gas from the waste heat boiler. It does not consider utilizing compressor exhaust as a heat source to reduce the cooling air consumption of the gas turbine itself, thus requiring further improvement in the thermal efficiency of the gas turbine system.

[0008] Existing patent CN109812299A discloses a method for cooling a gas turbine rotor and a cooling gas system. This patent uses a control system to regulate the extraction and feedwater valves to meet the temperature and flow rate requirements for cooling the gas turbine blades and rotor disc. However, this patent does not explicitly address the recovery and utilization of waste heat from the cooling gas and requires complex feedwater equipment, increasing the initial investment and operation / maintenance costs of the system.

[0009] In summary, none of the aforementioned existing patents have solved the problems of decreased operating efficiency and increased surge risk caused by fluctuations in the inlet air temperature of gas turbine compressors, as well as the problems of high cooling air consumption and insufficient cooling effect. Utility Model Content

[0010] Based on the aforementioned problems in the existing technology, this utility model provides an intake air temperature control system driven by the sensible heat of compressor extraction. This system cools the turbine after the compressor extraction air is cooled, enhancing the cooling effect and reducing the cooling air consumption to ensure the safety of the hot-end components of the gas turbine. At the same time, the compressor extraction air is used as a heat source to drive the preparation of cooling or heating working fluid. The compressor intake air temperature is controlled by adjusting the working fluid, so that the compressor intake air temperature can remain stable under different temperature environments.

[0011] To achieve the above objectives, this utility model proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The specific technical solution is as follows:

[0012] An intake air temperature control system driven by the sensible heat of compressor extraction includes:

[0013] The compressor, combustion chamber, and turbine are connected in sequence;

[0014] The refrigeration unit has a heat source end and a cooling output end;

[0015] The heat exchanger is equipped with a hot side passage and a cold side passage;

[0016] The inlet air temperature control heat exchanger has a control side and an air side, with the air side connected to the inlet pipeline of the compressor;

[0017] The refrigeration unit is connected between the compressor and the turbine and the inlet air temperature control heat exchanger to form a turbine cooling and inlet air cooling circuit.

[0018] The heat exchanger is connected between the compressor and the turbine and the inlet temperature control heat exchanger to form a turbine cooling and inlet temperature heating circuit.

[0019] Furthermore, the compressor and the turbine are respectively connected to the heat source inlet and heat source outlet of the refrigerant to form a multi-stage turbine cooling circuit.

[0020] Furthermore, the compressor and the turbine are respectively connected to the inlet and outlet of the hot side channel of the heat exchanger, forming a multi-stage turbine cooling circuit.

[0021] Furthermore, the compressor is connected to a low-pressure extraction pipeline, a medium-pressure extraction pipeline, and a high-pressure extraction pipeline. Each extraction pipeline is divided into two branches, which are respectively connected to the heat source inlet of the refrigerator and the heat-side channel inlet of the heat exchanger.

[0022] Furthermore, the turbine is connected to a low-pressure cooling gas pipeline, a medium-pressure cooling gas pipeline, and a high-pressure cooling gas pipeline. Each cooling gas pipeline is divided into two branches, which are respectively connected to the heat source outlet of the refrigerator and the hot side channel outlet of the heat exchanger.

[0023] Furthermore, the pressure ratings of the extraction gas pipeline and the cooling gas pipeline in the turbine cooling circuit are the same.

[0024] Furthermore, it also includes a first control valve, which is provided in each of the branch circuits.

[0025] Furthermore, it also includes a flow regulating valve, a cooling gas temperature sensor, and a cooling gas flow meter disposed in the cooling gas pipeline near the turbine.

[0026] Furthermore, the control side inlet of the intake air temperature control heat exchanger is connected to the medium input pipeline, and the other end of the medium input pipeline is divided into two branches, which are respectively connected to the cold capacity output outlet of the refrigerator and the cold side channel outlet of the heat exchanger.

[0027] Furthermore, the control side outlet of the inlet temperature control heat exchanger is connected to the medium output pipeline, and the other end of the medium output pipeline is divided into two branches, which are respectively connected to the cold capacity output inlet of the refrigerator and the cold side channel inlet of the heat exchanger.

[0028] Furthermore, it also includes a second control valve, which is provided in each of the branches.

[0029] Furthermore, it also includes a working fluid temperature sensor located near the control side inlet of the inlet air temperature control heat exchanger, and a working fluid circulation pump and a working fluid flow meter located near the control side outlet of the inlet air temperature control heat exchanger.

[0030] Furthermore, the refrigeration unit is a lithium bromide refrigeration unit.

[0031] Furthermore, the control-side inlet of the intake air temperature control heat exchanger is located near the compressor.

[0032] Based on the above technical solution, this utility model has at least the following beneficial effects:

[0033] 1. This utility model proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The system sends compressor-extracted air into a heat release and cooling circuit, releasing heat to lower the temperature before using it to cool hot-end components, effectively improving the cooling effect of hot-end components in a gas turbine. A 35°C change in intake air temperature results in a 130°C reduction in high-pressure cooling gas temperature, a 100°C reduction in medium-pressure cooling gas temperature, and a 60°C reduction in low-pressure cooling gas temperature.

[0034] 2. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The intake air temperature control circuit is driven by the heat released by the compressor extraction in the compressor extraction heat release and cooling circuit, which maintains the intake air temperature near the gas turbine design point intake air temperature. This can effectively improve the thermal efficiency of the gas turbine. At the same time, the compressor extraction temperature is reduced, the cooling effect is improved, the cooling air consumption can be reduced, and additional efficiency gains can be brought about.

[0035] 3. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The intake air temperature control loop can switch between heating / cooling intake modes by opening or closing the corresponding control valves. The intake air heating / cooling temperature can be controlled by adjusting the speed of the working fluid circulation pump, thus maintaining the efficient operation of the gas turbine within a wide temperature range.

[0036] 4. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. It uses compressor extraction as the cooling medium for hot-end components. This is the same as the technical route of most existing heavy-duty gas turbines. It only requires the addition of an external compressor extraction heat release and cooling circuit and an intake air temperature control circuit, as well as related pipelines and valves. The upgrade and modification is relatively simple. Attached Figure Description

[0037] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0038] Figure 1This is a schematic diagram of an intake air temperature control system driven by the sensible heat of air extraction from a compressor, as proposed in Embodiment 1 of this utility model.

[0039] Reference numerals: 1-Compressor, 2-Combustion chamber, 31-High-pressure turbine, 32-Medium-pressure turbine, 33-Low-pressure turbine, 4-Inlet air temperature control heat exchanger, 5-Lithium bromide refrigerator, 51-High-pressure heat source circuit, 52-Medium-pressure heat source circuit, 53-Low-pressure heat source circuit, 6-Heat exchanger, 61-Hot side high-pressure section, 62-Hot side medium-pressure section, 63-Hot side low-pressure section, 7-Working fluid circulation pump, 8-First control valve, 9-Second control valve, 10-Flow regulating valve, 11-Cooling gas temperature sensor, 12-Cooling gas flow meter, 13-Working fluid temperature sensor, 14-Working fluid flow meter. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0041] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Example

[0043] See Figure 1 As shown, this embodiment provides a specific implementation of an intake air temperature control system driven by the sensible heat of compressor extraction. The control system mainly includes a compressor 1, a combustion chamber 2, a turbine 3, an intake air temperature control heat exchanger 4, a lithium bromide refrigerator 5, and a heat exchanger 6. The output end of the compressor 1 is connected to the input end of the combustion chamber 2, and the output end of the combustion chamber 2 is connected to the input end of the turbine 3. A generator, waste heat boiler, steam turbine, and chimney (all conventional installations not shown in the figure) are also connected after the turbine 3. The intake air temperature control heat exchanger 4 is connected in the intake pipeline of the compressor 1. The lithium bromide refrigerator 5 is connected between the compressor 1, the turbine 3, and the intake air temperature control heat exchanger 4. The heat source ends of the compressor 1, the turbine 3, and the lithium bromide refrigerator 5 are connected to form a compressor extraction cooling circuit. The intake air temperature control heat exchanger 4 is connected to the cooling output end of the lithium bromide refrigerator 5 to form a compressor intake air temperature regulation circuit. Heat exchanger 6 is connected between compressor 1 and turbine 3 and inlet temperature control heat exchanger 4. The hot side channel of compressor 1 and turbine 3 and heat exchanger 6 are connected to form a compressor extraction and cooling circuit. The inlet temperature control heat exchanger 4 and the cold side channel of heat exchanger 6 are connected to form a compressor inlet temperature regulation circuit.

[0044] Specifically, the compressor 1 is equipped with a low-pressure extraction outlet, a medium-pressure extraction outlet, and a high-pressure extraction outlet in its low-pressure, medium-pressure, and high-pressure sections, respectively. Each of the three extraction outlets is connected to an independent extraction pipeline. The other end of each extraction pipeline is divided into two branches: the two branches of the high-pressure extraction pipeline are connected to the inlet of the high-pressure heat source circuit 51 of the lithium bromide refrigerator 5 and the inlet of the hot-side high-pressure section 61 of the heat exchanger 6, respectively; the two branches of the medium-pressure extraction pipeline are connected to the inlet of the medium-pressure heat source circuit 52 of the lithium bromide refrigerator 5 and the inlet of the hot-side medium-pressure section 62 of the heat exchanger 6, respectively; and the two branches of the low-pressure extraction pipeline are connected to the inlet of the low-pressure heat source circuit 53 of the lithium bromide refrigerator 5 and the inlet of the hot-side low-pressure section 63 of the heat exchanger 6, respectively.

[0045] Specifically, turbine 3 includes a high-pressure turbine 31, a medium-pressure turbine 32, and a low-pressure turbine 33. Each of these turbines is equipped with a high-pressure cooling gas inlet, a medium-pressure cooling gas inlet, and a low-pressure cooling gas inlet, respectively. Each cooling gas inlet is connected to an independent cooling gas pipeline. The other end of each cooling gas pipeline branches into two branches: the two branches of the high-pressure cooling gas pipeline connect to the outlet of the high-pressure heat source circuit 51 of the lithium bromide refrigerator 5 and the outlet of the hot-side high-pressure section 61 of the heat exchanger 6, respectively; the two branches of the medium-pressure cooling air pipeline connect to the outlet of the medium-pressure heat source circuit 52 of the lithium bromide refrigerator 5 and the outlet of the hot-side medium-pressure section 62 of the heat exchanger 6, respectively; and the two branches of the low-pressure cooling air pipeline connect to the outlet of the low-pressure heat source circuit 53 of the lithium bromide refrigerator 5 and the outlet of the hot-side low-pressure section 63 of the heat exchanger 6, respectively. A regulating valve 10, a cooling gas temperature sensor 11, and a cooling gas flow meter 12 are installed near the cooling gas inlets in each cooling air pipeline.

[0046] Specifically, a first control valve 8 is installed in each inlet and outlet branch of the heat source end of the lithium bromide refrigerator 5 and in each inlet and outlet branch of the hot side channel of the heat exchanger 6, for switching the heating / cooling air intake mode.

[0047] Specifically, the control-side inlet of the inlet temperature control heat exchanger 4 is connected to the medium input pipeline, and the control-side outlet of the inlet temperature control heat exchanger 4 is connected to the medium output pipeline. The control-side inlet of the temperature control heat exchanger 4 is close to the compressor 1. The other end of the medium input pipeline splits into two branches, which are respectively connected to the cold output outlet of the lithium bromide refrigerator 5 and the cold-side channel outlet of the heat exchanger 6. A second control valve 9 is installed on each of the two branches. The other end of the medium output pipeline also splits into two branches, which are respectively connected to the cold output inlet of the lithium bromide refrigerator 5 and the cold-side channel inlet of the heat exchanger 6. A second control valve 9 is installed on each of the two branches. A working fluid temperature sensor 13 is installed in the medium input pipeline near the control-side inlet of the inlet temperature control heat exchanger 4, and a working fluid flow meter 14 and a working fluid circulation pump 7 are installed in the medium output pipeline near the control-side outlet of the inlet temperature control heat exchanger 4. The air-side inlet of the inlet temperature control heat exchanger 4 is connected to the atmosphere, and the air-side outlet is connected to the inlet of the compressor 1.

[0048] Optionally, the control side of the inlet temperature control heat exchanger 4 is a horizontally placed spiral coil.

[0049] Optionally, the working fluid circulation pump 7 can be a variable frequency pump, which can steplessly adjust the speed through variable frequency control, thereby adjusting the flow rate of the working fluid.

[0050] Optionally, the flow regulating valve 10 can be an electric V-ball valve.

[0051] Optionally, the working fluid temperature sensor 13 and the cooling gas temperature sensor 11 can be K-type thermocouples with a circumferential 3-point redundant arrangement.

[0052] Optionally, the working fluid flow meter 14 and the cooling gas flow meter 12 can be vortex flow meters.

[0053] The control side of the aforementioned intake air temperature control heat exchanger 4, the cold output end of the lithium bromide refrigerator 5, the cold measurement channel of the heat exchanger 6, the working fluid circulation pump 7, the second control valve 9, the working fluid temperature sensor, the working fluid flow meter, and the pipelines between each component and device together form the intake air temperature control loop.

[0054] The working process of an intake air temperature control system driven by the sensible heat of compressor extraction proposed in this embodiment will be described below.

[0055] When the ambient temperature is high, close the first control valve 8 in each branch of the hot side channel of heat exchanger 6 and the second control valve 9 in each branch of the cold side channel of heat exchanger 6. Open the first control valve 8 in each branch of the heat source end of lithium bromide refrigerator 5 and the second control valve 9 in each branch of the cooling capacity output end of lithium bromide refrigerator 5. At this time, the inlet air temperature control heat exchanger 4 is in cooling inlet air mode. The specific working process is as follows:

[0056] A certain amount of air is extracted from the low-pressure, medium-pressure, and high-pressure sections of compressor 1 to cool the hot-end components of turbine 3. This extracted air is then introduced through extraction pipelines into the low-pressure heat source circuit 53, medium-pressure heat source circuit 52, and high-pressure heat source circuit 51 of lithium bromide refrigerator 5. The extracted air acts as a heat source, driving the lithium bromide refrigerator 5 to generate a low-temperature working fluid at the cooling output end. Simultaneously, the extracted air releases heat to lower the temperature and flows out from the outlets of the low-pressure heat source circuit 53, medium-pressure heat source circuit 52, and high-pressure heat source circuit 51, respectively, and into the cooling air inlets of the low-pressure turbine 33, medium-pressure turbine 32, and high-pressure turbine 31. Cooling air temperature sensor 11 and cooling air flow meter 12 on the cooling air pipeline measure the temperature and flow rate of the cooling air on their respective pipelines. Based on the current initial temperature of the gas turbine and the empirical flow-temperature relationship curve established from component test data and whole-machine test data, a fuzzy PID control algorithm is used to adjust the opening of the flow regulating valve 10, thereby achieving dynamic regulation of the cooling airflow. The flow regulating valve 10 adopts an equal percentage flow characteristic to ensure fine adjustment even at small openings.

[0057] The low-temperature working fluid generated at the cooling output end of the lithium bromide refrigerator 5 flows into the control side of the inlet air temperature control heat exchanger 4 under the drive of the working fluid circulation pump 7. The spiral coil is gradually cooled. The working fluid temperature sensor 11 at the inlet of the control side and the working fluid flow meter 12 at the outlet measure the working fluid temperature and flow rate, respectively. Based on the current ambient temperature, gas turbine inlet air flow rate and target inlet air temperature, and the flow-temperature empirical relationship curve established by component test data and whole machine test data, the speed of the working fluid circulation pump 7 is adjusted through the fuzzy PID control algorithm, thereby adjusting the working fluid flow rate and realizing the inlet air temperature regulation.

[0058] When the ambient temperature is low, close the first control valve 8 in each branch of the lithium bromide chiller 5 at the heat source end and the second control valve 9 in each branch of the lithium bromide chiller 5 at the cooling capacity output end. Open the first control valve 8 in each branch of the hot side channel of the heat exchanger 6 and the second control valve 9 in each branch of the cold side channel of the heat exchanger 6. At this time, the inlet air temperature control heat exchanger 4 is in heating inlet air mode. The specific working process is as follows:

[0059] A certain amount of air is extracted from the low-pressure, medium-pressure, and high-pressure sections of compressor 1 to cool the hot-end components of turbine 3. The extracted air is then introduced into the low-pressure section 63, medium-pressure section 62, and high-pressure section 61 of the hot-side channel of heat exchanger 6 through extraction pipelines. The extracted air heats the working fluid in the cold-side channel, releasing heat to lower the temperature. It then flows out from the outlets of the low-pressure section 63, medium-pressure section 62, and high-pressure section 61 of the hot-side channel and flows into the cooling air inlets of low-pressure turbine 33, medium-pressure turbine 32, and high-pressure turbine 31, respectively. Cooling air temperature sensor 11 and cooling air flow meter 12 on the cooling air pipeline measure the temperature and flow rate of the cooling air on their respective pipelines. Based on the current initial temperature of the gas turbine and the empirical flow-temperature relationship curve established from component test data and whole-machine test data, the opening of the flow regulating valve 10 is adjusted through a fuzzy PID control algorithm to achieve dynamic regulation of the cooling airflow. The flow regulating valve 10 adopts an equal percentage flow characteristic to ensure fine adjustment even at small openings.

[0060] The high-temperature working fluid, heated in the cold side channel of heat exchanger 6, flows into the control side of the inlet temperature control heat exchanger 4 under the drive of the working fluid circulation pump 7. The spiral coil is gradually heated. The working fluid temperature sensor 11 at the inlet of the control side and the working fluid flow meter 12 near the outlet measure the working fluid temperature and flow rate, respectively. Combined with the current ambient temperature, gas turbine inlet flow rate and target inlet temperature, the speed of the working fluid circulation pump 7 is adjusted through the fuzzy PID control algorithm, thereby adjusting the working fluid flow rate and realizing the inlet temperature regulation.

[0061] The aforementioned intake air temperature control system, driven by the sensible heat of compressor exhaust, utilizes a lithium bromide refrigerator or heat exchanger to cool the turbine after the compressor exhaust is cooled, enhancing the cooling effect and reducing the cooling air consumption to ensure the safety of the hot-end components of the gas turbine. Simultaneously, the compressor exhaust is used as a heat source to drive the lithium bromide refrigerator to prepare a cooling working fluid, which lowers the compressor intake air temperature. Alternatively, the compressor exhaust can be used as a heat source to heat the working fluid in the heat exchanger, raising the compressor intake air temperature. This system ensures that the compressor intake air temperature remains stable under different temperature environments, further improving the thermal efficiency of the gas turbine.

[0062] In summary, the intake air temperature control system driven by the sensible heat of compressor extraction proposed in this utility model has the following beneficial effects:

[0063] 1. This utility model proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The system sends compressor-extracted air into a heat release and cooling circuit, releasing heat to lower the temperature before using it to cool hot-end components, effectively improving the cooling effect of hot-end components in a gas turbine. A 35°C change in intake air temperature results in a 130°C reduction in high-pressure cooling gas temperature, a 100°C reduction in medium-pressure cooling gas temperature, and a 60°C reduction in low-pressure cooling gas temperature.

[0064] 2. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The intake air temperature control circuit is driven by the heat released by the compressor extraction in the compressor extraction heat release and cooling circuit, which maintains the intake air temperature near the gas turbine design point intake air temperature. This can effectively improve the thermal efficiency of the gas turbine. At the same time, the compressor extraction temperature is reduced, the cooling effect is improved, the cooling air consumption can be reduced, and additional efficiency gains can be brought about.

[0065] 3. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. The intake air temperature control loop can switch between heating / cooling intake modes by opening or closing the corresponding control valves. The intake air heating / cooling temperature can be controlled by adjusting the speed of the working fluid circulation pump, thus maintaining the efficient operation of the gas turbine within a wide temperature range.

[0066] 4. The present invention proposes an intake air temperature control system driven by the sensible heat of compressor extraction. It uses compressor extraction as the cooling medium for hot-end components. This is the same as the technical route of most existing heavy-duty gas turbines. It only requires the addition of an external compressor extraction heat release and cooling circuit and an intake air temperature control circuit, as well as related pipelines and valves. The upgrade and modification is relatively simple.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0069] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. An intake air temperature control system driven by a compressor bleed air sensible heat, characterized by, include: The compressor, combustion chamber, and turbine are connected in sequence; The refrigeration unit has a heat source end and a cooling output end; The heat exchanger is equipped with a hot side passage and a cold side passage; The inlet air temperature control heat exchanger has a control side and an air side, with the air side connected to the inlet pipeline of the compressor; The refrigeration unit is connected between the compressor and the turbine and the inlet air temperature control heat exchanger to form a turbine cooling and inlet air cooling circuit. The heat exchanger is connected between the compressor and the turbine and the inlet temperature control heat exchanger to form a turbine cooling and inlet temperature heating circuit.

2. The intake air temperature control system driven by the sensible heat of compressor extraction according to claim 1, characterized in that: The compressor and the turbine are respectively connected to the heat source inlet and heat source outlet of the refrigerant, forming a multi-stage turbine cooling circuit.

3. The intake air temperature control system driven by compressed air bleed heat according to claim 2, characterized by: The compressor and the turbine are respectively connected to the inlet and outlet of the hot side channel of the heat exchanger, forming a multi-stage turbine cooling circuit.

4. The intake air temperature control system driven by compressed air bleed heat according to claim 3, characterized by: The compressor is connected to a low-pressure extraction pipeline, a medium-pressure extraction pipeline, and a high-pressure extraction pipeline. Each extraction pipeline is divided into two branches, which are respectively connected to the heat source inlet of the refrigerator and the heat-side channel inlet of the heat exchanger.

5. The intake air temperature control system driven by compressed air bleed heat according to claim 4, characterized by: The turbine is connected to a low-pressure cooling gas pipeline, a medium-pressure cooling gas pipeline, and a high-pressure cooling gas pipeline. Each cooling gas pipeline is divided into two branches, which are respectively connected to the heat source outlet of the refrigerator and the hot side channel outlet of the heat exchanger.

6. The intake air temperature control system driven by compressed air bleed heat according to claim 5, characterized by: The turbine cooling circuit has the same pressure rating for the extraction gas pipeline and the cooling gas pipeline.

7. The intake air temperature control system driven by compressed air bleed heat according to claim 5, characterized by: It also includes a first control valve, which is provided in each of the branch lines.

8. The intake air temperature control system driven by compressed air bleed heat according to claim 5, characterized by: It also includes a flow regulating valve, a cooling gas temperature sensor, and a cooling gas flow meter disposed in the cooling gas pipeline near the turbine.

9. The intake air temperature control system driven by compressed air bleed heat according to claim 3, characterized by: The control side inlet of the inlet temperature control heat exchanger is connected to the medium input pipeline. The other end of the medium input pipeline is divided into two branches, which are respectively connected to the cold output outlet of the refrigerator and the cold side channel outlet of the heat exchanger.

10. The intake air temperature control system driven by compressed air bleed heat according to claim 9, characterized by: The control side outlet of the inlet temperature control heat exchanger is connected to the medium output pipeline. The other end of the medium output pipeline is divided into two branches, which are respectively connected to the cold capacity output inlet of the refrigerator and the cold side channel inlet of the heat exchanger.

11. The intake air temperature control system driven by compressed air bleed heat according to claim 10, characterized in that: It also includes a second control valve, which is provided in each of the branches.

12. The intake air temperature control system driven by compressed air bleed heat according to claim 11, characterized in that: It also includes a working fluid temperature sensor located near the control side inlet of the inlet air temperature control heat exchanger and a working fluid circulation pump and a working fluid flow meter located near the control side outlet of the inlet air temperature control heat exchanger.

13. The intake air temperature control system driven by compressed air bleed heat according to any one of claims 1-12, characterized in that: The refrigeration unit is a lithium bromide refrigeration unit.

14. The intake air temperature control system driven by compressed air bleed heat according to claim 13, characterized by: The control-side inlet of the inlet temperature control heat exchanger is located near the compressor.

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