Indirectly heated biomass gas turbine system and method thereof

Abstract

The present application belongs to the technical field of gas turbine, and relates to an indirect heating biomass gas turbine system and a method thereof, comprising an air compressor, an air turbine, a generator, a combustion chamber, a first waste heat recovery module, an indirect heating module, a second waste heat recovery module and a third waste heat recovery module. The present application adopts the mode of indirect heat exchange between compressed air and flue gas to heat the compressed air, avoids the direct contact between the fuel combustion products and the turbine blades, effectively prevents the problems of turbine blade corrosion, dust accumulation, wear and fouling, and prolongs the service life of the core components such as turbine blades. At the same time, the tail gas waste heat of the air turbine is used to heat the compressed air, the average heat absorption temperature of the air is improved, and the fuel combustion heat conversion efficiency is improved. In addition, the tail gas waste heat of the air turbine is used to heat and cool the user, which not only improves the energy utilization efficiency of the system, but also realizes heat and power cogeneration in winter and cold and power cogeneration in summer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas turbines, and relates to an indirectly heated biomass gas turbine system and a method thereof. BACKGROUND

[0002] A gas turbine is a device for converting the heat energy of gas into mechanical power output through a thermodynamic cycle, and has advantages of high efficiency, quick start, short construction period, etc. A traditional gas turbine usually comprises a compressor, a combustion chamber and a turbine, and air in the atmosphere is sucked in and compressed, and then high-pressure air is provided to the combustion chamber, chemical energy of fuel is converted into heat energy in the combustion chamber, high-temperature and high-pressure flue gas is provided for the turbine, finally, the heat energy of the high-temperature and high-pressure flue gas is converted into mechanical energy of the turbine rotor by the turbine, and the mechanical energy is used to drive a generator to generate electricity.

[0003] At present, the traditional gas turbine adopts a direct combustion mode, and the flue gas generated by combustion is directly introduced into the turbine to do work, which has many defects. Firstly, impurities in the flue gas will affect the safe and stable operation of the turbine, and there is a safety hazard. Secondly, direct combustion power generation lacks a multi-energy collaborative utilization mechanism, resulting in a large amount of waste of low-temperature waste heat resources. SUMMARY

[0004] The present application aims to provide an indirectly heated biomass gas turbine system and a method thereof, which can ensure the safe and stable operation of the turbine while reducing the waste of low-temperature waste heat resources.

[0005] To achieve the above-mentioned purpose, the technical solutions provided by the present application are as follows:

[0006] An indirectly heated biomass gas turbine system, comprising an air compressor, an air turbine, a generator and a combustion chamber, the air compressor, the air turbine and the generator being coaxially connected, and further comprising:

[0007] A first waste heat recovery module comprising a regenerator, a first inlet of the regenerator being connected with an outlet of the air compressor, and a second inlet of the regenerator being connected with an outlet of the air turbine, the regenerator being used for heating compressed air from the air compressor by using tail gas of the air turbine;

[0008] The indirect heating module comprises a heater and a preheater, a first inlet of the heater is connected with a first outlet of the regenerator, a first outlet of the heater is connected with an inlet of the air turbine, a second inlet of the heater is connected with an outlet of the combustion chamber, a first inlet of the preheater is connected with the atmosphere, a first outlet of the preheater is connected with a first inlet of the combustion chamber, a second inlet of the combustion chamber is connected with a fuel source, the preheater is used for sending preheated air into the combustion chamber to burn with the fuel, flue gas generated by the burning is sent into the heater to heat compressed air heated once again and discharged from a second outlet of the heater, the compressed air heated twice is sent into the air turbine to expand and do work, mechanical energy generated by the work drives the air compressor and drives the generator to generate electricity;

[0009] The second waste heat recovery module is connected with the second outlet of the regenerator and is used for supplying heat to users by using waste heat in tail gas of the air turbine.

[0010] The third waste heat recovery module is connected with the second outlet of the regenerator and is used for supplying cold to users by using waste heat in tail gas of the air turbine.

[0011] The application also has the characteristics that:

[0012] The second outlet of the regenerator is connected with the second waste heat recovery module and the third waste heat recovery module, the second waste heat recovery module is used for supplying heat to users by using waste heat in tail gas of the air turbine, and the third waste heat recovery module is used for supplying cold to users by using waste heat in tail gas of the air turbine.

[0013] The second waste heat recovery module comprises:

[0014] The heating heat exchanger is connected with the second outlet of the regenerator, and a first outlet of the heating heat exchanger is connected with the atmosphere.

[0015] The first circulating member is connected with the second inlet and the second outlet of the heating heat exchanger and is used for conveying circulating water to users after the circulating water is heated in the heating heat exchanger.

[0016] The third waste heat recovery module comprises:

[0017] The generator is connected with the second outlet of the regenerator, and a first outlet of the generator is connected with the atmosphere, the generator stores a refrigerant concentrated solution with pressure, and the generator is used for obtaining a refrigerant dilute solution and a refrigerant vapor by absorbing heat of the refrigerant concentrated solution.

[0018] The condenser is connected with the second outlet of the generator and is used for introducing the refrigerant vapor and condensing the refrigerant vapor.

[0019] The evaporator is connected with the condenser through a throttling valve.

[0020] The second circulation component is connected to the second inlet and the second outlet of the evaporator. It is used to send the cooling working fluid into the evaporator to absorb the cold energy in the condensed refrigerant that has passed through the throttling valve and supply cooling to the user. At the same time, it turns the condensed refrigerant into refrigerant vapor.

[0021] The first outlet of the evaporator is connected to the first inlet of the absorber. The second inlet of the absorber is connected to the third outlet of the generator through a pressure-reducing valve. The outlet of the absorber is connected to the second inlet of the generator through a booster pump. The absorber is used to absorb refrigerant vapor from the generator by using a dilute refrigerant solution and reducing its pressure through the pressure-reducing valve to obtain a concentrated refrigerant solution. The solution is then pressurized by the booster pump and sent into the generator.

[0022] The refrigerant is either ammonia or lithium bromide.

[0023] The second outlet of the heater is connected to the second inlet of the preheater, which is used to preheat the air with the heat exchanged flue gas. The second outlet of the preheater is connected to a carbon capture device.

[0024] A method for indirectly heated biomass gas turbines includes the following steps:

[0025] Ambient air is introduced into an air compressor and a preheater. The ambient air is compressed in the air compressor to obtain medium-temperature high-pressure air. The medium-temperature high-pressure air enters the regenerator for heating to obtain medium-high temperature high-pressure air. After being preheated in the preheater, the ambient air enters the combustion chamber and is burned with fuel to produce high-temperature flue gas. The high-temperature flue gas enters the heater to exchange heat with the medium-high temperature high-pressure air. The medium-high temperature high-pressure air becomes high-temperature high-pressure air and enters the air turbine to expand and do work. The mechanical energy generated by the expansion and work drives the air compressor and drives the generator to generate electricity. After heat exchange, the high-temperature flue gas enters the preheater for heat exchange and cooling before being discharged. The high-temperature high-pressure air after expansion and work enters the regenerator for heat exchange and cooling to become medium-temperature ambient pressure air.

[0026] During heating, medium-temperature, normal-pressure air enters the heating heat exchanger to heat the circulating water, and the heated circulating water is used to provide heating to users before being discharged into the atmosphere.

[0027] During cooling, medium-temperature, ambient-pressure air enters the generator to heat the high-pressure refrigerant concentrated solution, which is then discharged into the atmosphere. The high-pressure refrigerant concentrated solution absorbs heat and becomes a dilute refrigerant solution mixed with medium-temperature, high-pressure refrigerant vapor. The medium-temperature, high-pressure refrigerant vapor enters the condenser and condenses to obtain medium-low-temperature, high-pressure refrigerant. The medium-low-temperature, high-pressure refrigerant passes through a throttling valve to obtain low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant enters the evaporator to exchange heat with the cooling medium. The cooling medium absorbs cold energy and supplies cooling to users. The low-temperature, low-pressure refrigerant absorbs heat and becomes low-temperature, low-pressure refrigerant vapor, which enters the absorber. The dilute refrigerant solution in the generator is depressurized by a pressure-reducing valve and then enters the absorber to absorb the low-temperature, low-pressure refrigerant vapor to obtain a concentrated refrigerant solution. The concentrated refrigerant solution is pressurized by a booster pump to obtain a high-pressure concentrated refrigerant solution, which then enters the generator for recirculation.

[0028] The temperatures of medium-temperature, high-pressure air are 160℃~200℃ and the pressure is 300kPa~400kPa; the temperatures of medium-high temperature, high-pressure air are 500℃~600℃ and the pressure is 300kPa~400kPa; the temperatures of high-temperature flue gas are 1000℃~1300℃; the temperatures of high-temperature, high-pressure air are 900℃~1200℃ and the pressure is 300kPa~400kPa; and the temperatures of medium-temperature, normal-pressure air are 550℃~600℃. The pressure is 101.3 kPa; the pressure of the high-pressure refrigerant concentrated solution is 1.17 MPa to 1.35 MPa; the temperature of the medium-temperature high-pressure refrigerant vapor is 150℃ to 160℃ and the pressure is 1.17 MPa to 1.35 MPa; the temperature of the medium-low temperature high-pressure refrigerant is 30℃ to 35℃ and the pressure is 1.17 MPa to 1.35 MPa; and the temperature of the low-temperature low-pressure refrigerant is -5℃ to 0℃ and the pressure is 350 kPa to 430 kPa.

[0029] The fuel is biomass fuel.

[0030] The indirect heating biomass gas turbine system and method of the present invention have the following advantages:

[0031] This invention employs an indirect heat exchange method between compressed air and flue gas to heat compressed air, avoiding direct contact between fuel combustion products and turbine blades. This effectively prevents problems such as corrosion, ash accumulation, wear, and scaling of turbine blades, extending the service life of core components such as turbine blades and ensuring the long-term reliability and stability of the system. Simultaneously, utilizing the waste heat from the air turbine's exhaust gas to heat the compressed air increases the average heat absorption temperature of the air, thereby improving the fuel combustion thermoelectric conversion efficiency. Furthermore, by utilizing the waste heat from the air turbine's exhaust gas to provide heating and cooling to users, not only is the system's energy utilization efficiency improved, but combined heat and power (CHP) can also be achieved in winter and combined cooling and power (CCHP) in summer, thus realizing the combined supply of different types of energy in different seasons and avoiding the waste of low-temperature waste heat resources. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the overall process of the present invention.

[0034] Figure label:

[0035] 1. Air compressor, 2. Regenerator, 3. Heater, 4. Air turbine, 5. Combustion chamber, 6. Preheater, 7. Carbon capture device, 8. Generator, 9. Condenser, 10. Throttling valve, 11. Evaporator, 12. Absorber, 13. Booster pump, 14. Pressure reducing valve, 15. Heating heat exchanger, 101. First control valve, 102. Second control valve, 103. Third control valve. Detailed Implementation

[0036] The technical solutions of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments of the present invention, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] like Figure 1As shown, this invention provides an indirect-heating biomass gas turbine system, including an air compressor 1, an air turbine 4, a generator, a combustion chamber 5, a first waste heat recovery module, an indirect heating module, a second waste heat recovery module, and a third waste heat recovery module. The air compressor 1, air turbine 4, and generator are coaxially connected. The first waste heat recovery module includes a regenerator 2, whose first inlet is connected to the outlet of the air compressor 1, and whose second inlet is connected to the outlet of the air turbine 4. The regenerator 2 is used to heat the compressed air from the air compressor 1 using the exhaust gas from the air turbine 4. The indirect heating module includes a heater 3 and a preheater 6, whose first inlet is connected to the first outlet of the regenerator 2, whose first outlet is connected to the inlet of the air turbine 4, and whose second inlet is connected to the outlet of the combustion chamber 5. The first inlet of the preheater 6 is connected to the atmosphere, the first outlet of the preheater 6 is connected to the first inlet of the combustion chamber 5, and the second inlet of the combustion chamber 5 is connected to the fuel source. The preheater 6 is used to send preheated air into the combustion chamber 5 to burn with fuel. The generated flue gas enters the heater 3 to reheat the heated compressed air and is discharged from the second outlet of the heater 3. The compressed air after being heated twice enters the air turbine 4 to expand and do work. The mechanical energy generated by the expansion and work drives the air compressor 1 and drives the generator to generate electricity. The second waste heat recovery module is connected to the second outlet of the regenerator 2. The second waste heat recovery module is used to use the waste heat in the exhaust gas of the air turbine 4 to provide heating to users. The third waste heat recovery module is connected to the second outlet of the regenerator 2. The third waste heat recovery module is used to use the waste heat in the exhaust gas of the air turbine 4 to provide cooling to users. This invention employs an indirect heat exchange method between compressed air and flue gas to heat compressed air, avoiding direct contact between fuel combustion products and turbine blades. This effectively prevents problems such as corrosion, ash accumulation, wear, and scaling of turbine blades, extending the service life of core components such as turbine blades and ensuring the long-term reliability and stability of the system. Simultaneously, the waste heat from the exhaust gas of the air turbine 4 is used to heat the compressed air, increasing the average heat absorption temperature of the air and thus improving the fuel combustion thermoelectric conversion efficiency. Furthermore, by utilizing the waste heat from the exhaust gas of the air turbine 4 to provide heating and cooling to users, not only is the energy utilization efficiency of the system improved, but combined heat and power generation can also be achieved in winter and combined cooling and power generation in summer, thereby realizing the joint supply of different types of energy in different seasons and avoiding the waste of low-temperature waste heat resources.

[0038] like Figure 1 As shown, the second outlet of the regenerator 2 is connected to a second waste heat recovery module and a third waste heat recovery module. The second waste heat recovery module is used to provide heating to users by utilizing the waste heat in the exhaust gas of the air turbine 4, and the third waste heat recovery module is used to provide cooling to users by utilizing the waste heat in the exhaust gas of the air turbine 4. By further converting the waste heat in the exhaust gas of the air turbine 4 into heat and cooling, the energy utilization efficiency of the system is improved.

[0039] like Figure 1 As shown, the second waste heat recovery module includes a heating heat exchanger 15 and a first circulation component. The first inlet of the heating heat exchanger 15 is connected to the second outlet of the regenerator 2. The first outlet of the heating heat exchanger 15 is connected to the atmosphere. The first circulation component is connected to the second inlet and the second outlet of the heating heat exchanger 15. The first circulation component is used to introduce circulating water into the heating heat exchanger 15 for heating and then deliver it to the user.

[0040] The first circulation component includes a first circulation pump. The inlet of the first circulation pump is connected to the user side through a first connecting pipe. The outlet of the first circulation pump is connected to the second inlet of the heating heat exchanger 15. The second outlet of the heating heat exchanger 15 is connected to the user side through a second connecting pipe. The circulation medium of the first circulation component is circulating water.

[0041] like Figure 1 As shown, the third waste heat recovery module includes a generator 8, a condenser 9, and a second circulation component. The first inlet of the generator 8 is connected to the second outlet of the regenerator 2, and the first outlet of the generator 8 is connected to the atmosphere. The generator 8 stores a pressurized concentrated refrigerant solution. The generator 8 is used to absorb heat from the concentrated refrigerant solution to obtain a dilute refrigerant solution and refrigerant vapor. The inlet of the condenser 9 is connected to the second outlet of the generator 8. The condenser 9 introduces refrigerant vapor and condenses it. The first inlet of the evaporator 11 is connected to the condenser 9 through a throttle valve 10. The second circulation component is connected to the second inlet and the second outlet of the evaporator 11. The second circulation component is used to send the cooling working fluid into the evaporator 11 to absorb the cold energy in the condensed refrigerant that has passed through the throttle valve 10 and supply cooling to the user. At the same time, it turns the condensed refrigerant into refrigerant vapor.

[0042] The second circulation component includes a second circulation pump. The inlet of the second circulation pump is connected to the user side via a third connecting pipe. The outlet of the second circulation pump is connected to the second inlet of the evaporator 11. The second outlet of the evaporator 11 is connected to the user side via a fourth connecting pipe. The circulation medium of the second circulation component is a cooling working fluid.

[0043] like Figure 1 As shown, the first outlet of the evaporator 11 is connected to the first inlet of the absorber 12. The second inlet of the absorber 12 is connected to the third outlet of the generator 8 through a pressure-reducing valve 14. The outlet of the absorber 12 is connected to the second inlet of the generator 8 through a booster pump 13. The absorber 12 is used to absorb refrigerant vapor from the generator 8 after the refrigerant solution is depressurized by the pressure-reducing valve 14 to obtain a concentrated refrigerant solution, which is then pressurized by the booster pump 13 and sent into the generator 8.

[0044] like Figure 1 As shown, the refrigerant is either ammonia or lithium bromide.

[0045] likeFigure 1 As shown, the second outlet of heater 3 is connected to the second inlet of preheater 6, which is used to preheat the air with the flue gas after heat exchange. The second outlet of preheater 6 is connected to carbon capture device 7, which uses the waste heat of flue gas to preheat the air, thereby increasing the air temperature in the combustion chamber and effectively reducing fuel consumption. At the same time, the carbon capture device 7 treats the flue gas, effectively separating and capturing carbon dioxide, reducing the carbon dioxide content finally emitted into the atmosphere, and ensuring the low carbon emissions of the system.

[0046] like Figure 1 As shown, the air compressor 1 is equipped with a first control valve 101 at its inlet, the heating heat exchanger 15 is equipped with a second control valve 102 at its first inlet, and the generator 8 is equipped with a third control valve 103 at its first inlet.

[0047] like Figure 2 As shown, the present invention also provides a method for indirectly heating a biomass gas turbine, comprising the following steps:

[0048] Ambient air is introduced into air compressor 1 and preheater 6 respectively. Ambient air is compressed in air compressor 1 to obtain medium-temperature high-pressure air. The medium-temperature high-pressure air enters regenerator 2 for heating to obtain medium-temperature high-pressure air. After being preheated in preheater 6, ambient air enters combustion chamber 5 to burn fuel and obtain high-temperature flue gas. The high-temperature flue gas enters heater 3 to exchange heat with the medium-temperature high-pressure air. The medium-temperature high-pressure air becomes high-temperature high-pressure air and enters air turbine 4 to expand and do work. The mechanical energy generated by the expansion drives air compressor 1 and drives generator to generate electricity. After heat exchange, the high-temperature flue gas enters preheater 6 for heat exchange and cooling before being discharged. The high-temperature high-pressure air after expansion enters regenerator 2 for heat exchange and cooling to become medium-temperature ambient air.

[0049] During heating, medium-temperature, normal-pressure air enters the heating heat exchanger 15 to heat the circulating water, and the heated circulating water is used to provide heating to users before being discharged into the atmosphere.

[0050] During cooling, medium-temperature, ambient-pressure air enters generator 8 to heat the high-pressure refrigerant concentrate, which is then discharged into the atmosphere. The high-pressure refrigerant concentrate absorbs heat and becomes a dilute refrigerant solution mixed with medium-temperature, high-pressure refrigerant vapor. The medium-temperature, high-pressure refrigerant vapor enters condenser 9 and condenses to obtain medium-low-temperature, high-pressure refrigerant. The medium-low-temperature, high-pressure refrigerant passes through throttling valve 10 to obtain low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant enters evaporator 11 to exchange heat with the cooling medium. The cooling medium absorbs cold energy and supplies cooling to users. The low-temperature, low-pressure refrigerant absorbs heat and becomes low-temperature, low-pressure refrigerant vapor, which enters absorber 12. The dilute refrigerant solution in generator 8 is depressurized by pressure-reducing valve 14 and enters absorber 12 to absorb low-temperature, low-pressure refrigerant vapor to obtain a concentrated refrigerant solution. The concentrated refrigerant solution is pressurized by booster pump 13 to obtain a high-pressure concentrated refrigerant solution, which then enters generator 8 for recirculation.

[0051] The fuel is biomass fuel.

[0052] Among them, the temperature of medium-temperature high-pressure air is 160℃~200℃ and the pressure is 300kPa~400kPa; the temperature of medium-high temperature high-pressure air is 500℃~600℃ and the pressure is 300kPa~400kPa; the temperature of high-temperature flue gas is 1000℃~1300℃; the temperature of high-temperature high-pressure air is 900℃~1200℃ and the pressure is 300kPa~400kPa; and the temperature of medium-temperature normal pressure air is 550℃~600℃. The pressure is 101.3 kPa; the pressure of the high-pressure refrigerant concentrated solution is 1.17 MPa to 1.35 MPa; the temperature of the medium-temperature high-pressure refrigerant vapor is 150℃ to 160℃ and the pressure is 1.17 MPa to 1.35 MPa; the temperature of the medium-low temperature high-pressure refrigerant is 30℃ to 35℃ and the pressure is 1.17 MPa to 1.35 MPa; and the temperature of the low-temperature low-pressure refrigerant is -5℃ to 0℃ and the pressure is 350 kPa to 430 kPa.

[0053] Working principle: When the system is running, the first control valve 101 is opened, and room temperature air is introduced into the air compressor 1 and the preheater 6 respectively. The room temperature air enters the air compressor 1 and is compressed to obtain medium-temperature high-pressure air. The medium-temperature high-pressure air enters the regenerator 2 and is heated to obtain medium-temperature high-pressure air. The room temperature air enters the preheater 6 and is preheated before entering the combustion chamber 5 to burn with fuel to obtain high-temperature flue gas. The high-temperature flue gas enters the heater 3 to exchange heat with the medium-temperature high-pressure air. The medium-temperature high-pressure air becomes high-temperature high-pressure air and enters the air turbine 4 to expand and do work. The mechanical energy generated by the expansion work drives the air compressor 1 and drives the generator to generate electricity. After heat exchange, the high-temperature flue gas enters the preheater 6 for heat exchange and cooling before being discharged. The high-temperature high-pressure air after expansion work enters the regenerator 2 for heat exchange and cooling to become medium-temperature normal-pressure air.

[0054] When heating is needed in winter, the second control valve 102 is opened and the third control valve 103 is closed. Medium-temperature, normal-pressure air enters the heating heat exchanger 15 to heat the circulating water. The heated circulating water is then used to provide heating to users before being discharged into the atmosphere.

[0055] When cooling is required in summer, the third control valve 103 is opened and the second control valve 102 is closed. Medium-temperature, normal-pressure air enters the generator 8 to heat the high-pressure refrigerant concentrate, and then is discharged into the atmosphere. The high-pressure refrigerant concentrate absorbs heat and becomes a dilute refrigerant solution and medium-temperature, medium-pressure refrigerant vapor. The medium-temperature, medium-pressure refrigerant vapor enters the condenser 9 and is condensed to obtain a medium-low temperature, medium-pressure refrigerant. The medium-low temperature, medium-pressure refrigerant passes through the throttling valve 10 to obtain a low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant enters the evaporator 11 to exchange heat with the cooling medium. After absorbing the cold energy, the cooling medium supplies cooling to the user. The low-temperature, low-pressure refrigerant absorbs heat and becomes a low-temperature, low-pressure refrigerant vapor. The low-temperature, low-pressure refrigerant vapor enters the absorber 12 and is absorbed by the dilute refrigerant solution from the generator 8. After being pressurized by the booster pump 13, it becomes a high-pressure refrigerant concentrate and enters the generator 8 again for recirculation.

[0056] Other advantages of the indirect heating biomass gas turbine system and method of the present invention are as follows:

[0057] First, by combining an air turbine, a regenerator, a second waste heat recovery module, and a third waste heat recovery module, this invention enables the waste heat from the exhaust gas of the air turbine to be utilized in stages and further converted into heat and cooling.

[0058] Secondly, this invention utilizes the waste heat of flue gas to preheat the air, thereby increasing the air temperature in the combustion chamber and effectively reducing fuel consumption.

[0059] Third, the present invention uses a carbon capture device to treat flue gas, effectively separating and capturing carbon dioxide in it, reducing the amount of carbon dioxide ultimately emitted into the atmosphere, and ensuring low carbon emissions from the system.

[0060] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An indirectly heated biomass gas turbine system comprising an air compressor (1), an air turbine (4), a generator and a combustion chamber (5), said air compressor (1), air turbine (4) and generator being coaxially connected, characterized in that, Also comprising: a first waste heat recovery module, comprising a regenerator (2), a first inlet of the regenerator (2) is connected with an outlet of the air compressor (1), a second inlet of the regenerator (2) is connected with an outlet of the air turbine (4), the regenerator (2) is used for heating compressed air from the air compressor (1) by using tail gas of the air turbine (4); an indirect heating module, comprising a heater (3) and a preheater (6), a first inlet of the heater (3) is connected with a first outlet of the regenerator (2), a first outlet of the heater (3) is connected with an inlet of the air turbine (4), a second inlet of the heater (3) is connected with an outlet of the combustion chamber (5), a first inlet of the preheater (6) is connected with the atmosphere, a first outlet of the preheater (6) is connected with a first inlet of the combustion chamber (5), a second inlet of the combustion chamber (5) is connected with a fuel source, the preheater (6) is used for sending preheated air into the combustion chamber (5) to burn with the fuel, flue gas generated by the burning is sent into the heater (3) to heat the compressed air again, and the compressed air is discharged from a second outlet of the heater (3), the compressed air heated twice is sent into the air turbine (4) to expand and do work, mechanical energy generated by the work drives the air compressor (1) and drives a generator to generate electricity; a second waste heat recovery module, connected with the second outlet of the regenerator (2), used for supplying heat to users by using waste heat in the tail gas of the air turbine (4); a third waste heat recovery module, connected with the second outlet of the regenerator (2), used for supplying cold to users by using waste heat in the tail gas of the air turbine (4); a second outlet of the heater (3) is connected with a second inlet of the preheater (6), the preheater (6) is used for preheating air by using heat-exchanged flue gas, and a second outlet of the preheater (6) is connected with a carbon capture device (7).

2. The indirectly heated biomass gas turbine power system of claim 1 wherein, The second waste heat recovery module comprises: a heating heat exchanger (15), a first inlet of the heating heat exchanger (15) is connected with the second outlet of the regenerator (2), and a first outlet of the heating heat exchanger (15) is connected with the atmosphere; a first circulating member, connected with a second inlet and a second outlet of the heating heat exchanger (15), used for introducing circulating water into the heating heat exchanger (15) to heat the circulating water and then delivering the heated circulating water to users.

3. The indirectly heated biomass gas turbine power system of claim 2 wherein, The third waste heat recovery module comprises: a generator (8), a first inlet of the generator (8) is connected with the second outlet of the regenerator (2), a first outlet of the generator (8) is connected with the atmosphere, the generator (8) stores a concentrated refrigerant solution with pressure, the generator (8) is used for absorbing heat by using the concentrated refrigerant solution to obtain a dilute refrigerant solution and refrigerant vapor; a condenser (9), an inlet of the condenser (9) is connected with a second outlet of the generator (8), the condenser (9) introduces the refrigerant vapor and condenses the refrigerant vapor; an evaporator (11), a first inlet of the evaporator (11) is connected with the condenser (9) through a throttling valve (10); a second circulating member, connected with a second inlet and a second outlet of the evaporator (11), used for introducing a cooling working medium into the evaporator (11) to absorb cold from the condensed refrigerant passing through the throttling valve (10) to supply cold to users, and at the same time, the condensed refrigerant is changed into the refrigerant vapor.

4. The indirectly heated biomass gas turbine power system of claim 3 wherein, The first outlet of the evaporator (11) is connected with the first inlet of an absorber (12), the second inlet of the absorber (12) is connected with the third outlet of the generator (8) through a pressure reducing valve (14), the outlet of the absorber (12) is connected with the second inlet of the generator (8) through a pressure increasing pump (13), and the absorber (12) is used for absorbing refrigerant vapor to obtain a refrigerant concentrated solution by using the refrigerant dilute solution from the generator (8) and after pressure reduction through the pressure reducing valve (14), and then sending the refrigerant concentrated solution into the generator (8) after pressure increase through the pressure increasing pump (13).

5. The indirectly heated biomass gas turbine power system of claim 4 wherein, The refrigerant is ammonia water or lithium bromide.

6. An indirectly heated biomass gas turbine method, characterized by, The system of claim 5 comprises the following steps: The normal temperature air is introduced into the air compressor (1) and the preheater (6) respectively, the normal temperature air is compressed in the air compressor (1) to obtain medium temperature high pressure air, the medium temperature high pressure air is heated in the regenerator (2) to obtain medium high temperature high pressure air, the normal temperature air is preheated in the preheater (6) and then enters the combustion chamber (5) to combust with fuel to obtain high temperature flue gas, the high temperature flue gas is heated in the heater (3) with the medium high temperature high pressure air, the medium high temperature high pressure air becomes high temperature high pressure air and enters the air turbine (4) to expand and do work, the mechanical energy generated by the expansion and work drives the air compressor (1) and drives the generator to generate electricity, the high temperature flue gas after heat exchange enters the preheater (6) to exchange heat and then is discharged, the high temperature high pressure air after expansion and work enters the regenerator (2) to exchange heat and then becomes medium temperature normal pressure air; During heating, the medium temperature normal pressure air enters the heating heat exchanger (15) to heat the circulating water, the heated circulating water is used to heat users, and then is discharged into the atmosphere; During cooling, the medium temperature normal pressure air enters the generator (8) to heat the high pressure refrigerant concentrated solution, and then is discharged into the atmosphere, the high pressure refrigerant concentrated solution becomes refrigerant dilute solution and medium temperature high pressure refrigerant vapor after absorbing heat, the medium temperature high pressure refrigerant vapor enters the condenser (9) to condense to obtain medium low temperature high pressure refrigerant, the medium low temperature high pressure refrigerant passes through the throttling valve (10) to obtain low temperature low pressure refrigerant, the low temperature low pressure refrigerant enters the evaporator (11) to exchange heat with the cooling working medium, the cooling working medium absorbs cold energy to cool users, the low temperature low pressure refrigerant vapor enters the absorber (12) after absorbing heat, the refrigerant dilute solution in the generator (8) enters the absorber (12) to absorb the low temperature low pressure refrigerant vapor to obtain the refrigerant concentrated solution after pressure reduction through the pressure reducing valve (14), the refrigerant concentrated solution enters the generator (8) after pressure increase through the pressure increasing pump (13) to obtain the high pressure refrigerant concentrated solution, and the cycle is repeated.

7. The indirectly heated biomass gas turbine method of claim 6 wherein, The temperature of the medium-temperature high-pressure air is 160-200 DEG C, the pressure is 300-400 kPa, the temperature of the medium-high-temperature high-pressure air is 500-600 DEG C, the pressure is 300-400 kPa, the temperature of the high-temperature flue gas is 1000-1300 DEG C, the temperature of the high-temperature high-pressure air is 900-1200 DEG C, the pressure is 300-400 kPa, the temperature of the medium-temperature normal-pressure air is 550-600 DEG C, the pressure is 101.3 kPa, the pressure of the high-pressure refrigerant concentrated solution is 1.17-1.35 MPa, the temperature of the medium-temperature high-pressure refrigerant steam is 150-160 DEG C, the pressure is 1.17-1.35 MPa, the temperature of the medium-low-temperature high-pressure refrigerant is 30-35 DEG C, the pressure is 1.17-1.35 MPa, the temperature of the low-temperature low-pressure refrigerant is -5-0 DEG C, the pressure is 350-430 kPa.

8. The indirectly heated biomass gas turbine method of claim 6, wherein, The fuel is a biomass fuel.

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