A mobile combined cycle power generation system

Abstract

The invention provides a mobile combined cycle power generation system, including a single-stage micro gas turbine generator subsystem, a two-stage organic Rankine cycle generator subsystem and a battery pack. The single-stage micro gas turbine generator subsystem includes a first-stage compressor, a second-stage compressor, a combustion chamber, a turbine, a regenerator, a heat exchanger 1, a heat exchanger 2, an air-cooled generator 1, a rotor 1 and a fuel pump; the two-stage organic Rankine cycle generator subsystem includes a first-stage drive pump, a second-stage drive pump, a first-stage circulating medium, a second-stage circulating medium, an evaporator, a first-stage expander, a second-stage expander, a condenser, a condensation pump, a fuel tank, a rotor 2 and an air-cooled generator 2; the air-cooled generator 1 and the air-cooled generator 2 both supply power to the battery pack, and the battery pack supplies power to the power consumption side. The invention has a simple system flow, a highly integrated characteristic, convenient operation, a wide adjustment range, low pollutant emissions, and can improve power generation efficiency for different fuels and environmental conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of power generation, and in particular relates to a mobile combined cycle power generation system. Background Art

[0002] Electricity is a high-level energy source in the energy cascade utilization, and improving power generation efficiency is the goal pursued by every power generation system. Limited by the size and weight of the equipment, the power generation capacity of the mobile power generation system is generally at the level of hundreds of kilowatts, and because the operating temperature and pressure of the mobile power generation system are much lower than those of the fixed power generation system, this leads to the low power generation efficiency of the mobile power generation system. The power generation efficiency of each mobile power generation system under simple cycle conditions is difficult to exceed 20%. Therefore, in view of the lower operating temperature and pressure conditions of the mobile power generation system, considering the requirements for its highly integrated system, it is necessary to propose a mobile combined cycle power generation system that can achieve improved power generation efficiency while ensuring the mobility of the system. Summary of the invention

[0003] In view of this, the invention aims to propose a mobile combined cycle power generation system with simple system flow, highly integrated characteristics, easy operation, wide adjustment range, low pollutant emissions, and the ability to improve power generation efficiency for different fuels and environmental conditions.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A mobile combined cycle power generation system, comprising a single-stage micro gas turbine generator subsystem, a two-stage organic Rankine cycle generator subsystem and a battery pack, wherein the single-stage micro gas turbine generator subsystem comprises a first-stage compressor, a second-stage compressor, a combustion chamber, a turbine, a regenerator, a first heat exchanger, a second heat exchanger, a first air-cooled generator, a first rotor and a fuel pump; the two-stage organic Rankine cycle generator subsystem comprises a first-stage drive pump, a second-stage drive pump, a first-stage circulating medium, a second-stage circulating medium, an evaporator, a first-stage expander, a second-stage expander, a condenser, a condensation pump, a fuel tank, a second rotor and a second air-cooled generator;

[0006] The first-stage compressor, the second-stage compressor, the turbine and the air-cooled generator 1 are arranged in sequence and share the rotor 1; the first-stage expander, the second-stage expander and the air-cooled generator 2 are arranged in sequence and share the rotor 2;

[0007] The air inlet of the first-stage compressor is connected to the air, and the pressurized air is divided into cooling air and working air. The air outlet of the first-stage compressor is respectively connected to the hot fluid inlet of the heat exchanger 1 and the hot fluid inlet of the heat exchanger 2; the hot fluid outlet of the heat exchanger 1 discharges the cooled cooling air, the cold fluid inlet of the heat exchanger 1 is connected to the fuel pump outlet, and the cold fluid outlet of the heat exchanger 1 is connected to the combustion chamber; the hot fluid outlet of the heat exchanger 2 is connected to the air inlet of the second-stage compressor, the air outlet of the second-stage compressor is connected to the cold fluid inlet of the regenerator, and the cold fluid outlet of the regenerator is connected to the combustion chamber. The high-temperature combustion gas generated by the combustion chamber enters the turbine to do work, the air outlet of the turbine is connected to the hot fluid inlet of the regenerator, the hot fluid outlet of the regenerator is connected to the hot fluid inlet of the evaporator, and the hot fluid outlet of the evaporator is connected to the atmosphere;

[0008] The fuel tank provides fuel to the fuel pump, the fuel tank is connected with the condensate pump, the condensate pump is connected with the cold fluid inlet of the condenser, the fuel passing through the condensate pump is the condensed working fluid, the cold fluid outlet of the condenser is connected with the inlet of the fuel tank, the high temperature condensation section of the condenser is connected with the first-stage driving pump, the high temperature heat exchange section of the second heat exchanger, the high temperature evaporation section of the evaporator and the first-stage expansion machine in sequence to form a circulation loop of the first-stage circulating working fluid, the low temperature condensation section of the condenser is connected with the second-stage driving pump, the low temperature heat exchange section of the second heat exchanger, the low temperature evaporation section of the evaporator and the second-stage expansion machine in sequence to form a circulation loop of the second-stage circulating working fluid;

[0009] The air-cooled generator 1 and the air-cooled generator 2 both supply power to a battery pack, and the battery pack supplies power to a power-consuming side.

[0010] Furthermore, the hot fluid in the heat exchanger 1 is cooling air, and the cold fluid is fuel; the hot fluid in the heat exchanger 2 is working air, the cold fluid in the high-temperature heat exchange section is level I circulating working fluid, and the cold fluid in the low-temperature heat exchange section is level II circulating working fluid; the hot fluid in the regenerator is high-temperature fuel gas, and the cold fluid is working air; the hot fluid in the evaporator is high-temperature fuel gas, the cold fluid in the high-temperature evaporation section is level I circulating working fluid, and the cold fluid in the low-temperature evaporation section is level II circulating working fluid; the hot fluid in the high-temperature condensation section of the condenser is level I circulating working fluid, the hot fluid in the low-temperature condensation section is level II circulating working fluid, and the cold fluid is the condensation working fluid.

[0011] Furthermore, the heat exchanger 2 includes a hot air heat exchange channel, a high-temperature heat exchange section channel of a first-stage circulating working fluid, and a low-temperature heat exchange section channel of a second-stage circulating working fluid, and the hot air heat exchange channel simultaneously exchanges heat with the high-temperature heat exchange section channel of the first-stage circulating working fluid and the low-temperature heat exchange section channel of the second-stage circulating working fluid, and the high-temperature heat exchange section channel of the first-stage circulating working fluid and the low-temperature heat exchange section channel of the second-stage circulating working fluid are independent of each other and not connected.

[0012] Furthermore, the evaporator includes a hot gas heat exchange channel, a high-temperature evaporation section channel of a level I circulating working fluid, and a low-temperature evaporation section channel of a level II circulating working fluid, and the hot gas heat exchange channel simultaneously exchanges heat with the high-temperature evaporation section channel of the level I circulating working fluid and the low-temperature evaporation section channel of the level II circulating working fluid, and the high-temperature evaporation section channel of the level I circulating working fluid and the low-temperature evaporation section channel of the level II circulating working fluid are independent of each other and not connected.

[0013] Furthermore, the condenser includes a condensing working fluid heat exchange channel, a level I circulating working fluid high temperature condensation section channel, and a level II circulating working fluid low temperature condensation section channel, and the condensing working fluid heat exchange channel simultaneously exchanges heat with the level I circulating working fluid high temperature condensation section channel and the level II circulating working fluid low temperature condensation section channel, and the level I circulating working fluid high temperature condensation section channel and the level II circulating working fluid low temperature condensation section channel are independent of each other and not connected.

[0014] Furthermore, the rotor 1 is supported by an air bearing, and the rotor 2 is supported by a sliding bearing.

[0015] Furthermore, the cooling air discharged from the hot fluid outlet of the heat exchanger 1 is input into the coils of the air-bearing air-cooled generator 1 and the air-cooled generator 2 through the pipeline.

[0016] Furthermore, the combustion chamber is equipped with a high-energy igniter, and the high-energy igniter is powered by a battery pack.

[0017] Furthermore, the combustion chamber is configured as a lean premixed combustion chamber.

[0018] Furthermore, the volume of the fuel tank is 300-500L; the capacity of the battery pack is 100-200kWh.

[0019] Compared with the prior art, the mobile combined cycle power generation system created by the present invention has the following advantages:

[0020] This mobile combined cycle power generation system focuses on integrated design, reduces operating equipment, and achieves system mobility and improves system power generation efficiency through precise energy cascade utilization logic and reasonable energy loss solutions.

[0021] The portable combined cycle power generation system makes full use of the characteristics of the micro gas turbine, which is fast start-up and high efficiency under rated conditions, so that the single-stage micro gas turbine generator system can operate and generate electricity under rated conditions, thus avoiding the reduction in efficiency caused by variable operating conditions.

[0022] This mobile combined cycle power generation system makes full use of the high-speed operation of air bearings, which can reduce the size of compressors and turbines and reduce the weight of equipment. At the same time, compared with water-cooled and hydrogen-cooled generators, air-cooled generators using cooling air do not need to consider sealing and explosion-proof structures, reduce structural complexity, and facilitate maintenance. After the cooling air is cooled by the heat exchanger, the cooling efficiency can be improved, and the temperature of the heated fuel is increased, which helps to reduce fuel consumption.

[0023] The portable combined cycle power generation system adopts a lean premixed combustion chamber, which has high combustion efficiency. Under rated operating conditions, CO emissions are almost zero and NOx emissions are less than 25ppm.

[0024] The heat exchanger, evaporator and condenser of this mobile combined cycle power generation system fully utilize cold source or heat source working fluids in different temperature ranges for heat exchange, realize structural integrated design, and can greatly improve the energy utilization rate of the system. Its power generation efficiency is increased by 25%-50% compared with the single-stage micro gas turbine power generation subsystem.

[0025] This mobile combined cycle power generation system uses fuel as the condensing working fluid of the condenser. At the same time, the system has a short single operation time and a long interval between multiple operations. The condensing working fluid has a long enough time to cool down naturally, eliminating the need for a cooling tower for cooling the condensing working fluid. This can greatly reduce the size and weight of the system equipment and ensure the portability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0027] Figure 1 A structural schematic diagram of a mobile combined cycle power generation system according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the principle of the heat exchanger 2 according to the embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the principle of the evaporator described in the embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the principle of the condenser described in the embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1-single-stage micro gas turbine generator subsystem; 2-two-stage organic Rankine cycle generator subsystem; 3-battery pack; 4-power side; 5-air; 6-air bearing; 7-Ⅰ-stage compressor; 8-Ⅱ-stage compressor; 9-rotor 1; 10-turbine; 11-air-cooled generator 1; 12-cooling air; 13-heat exchanger 1; 14-working air; 15-fuel; 16-fuel pump; 17-heat exchanger 2; 18-regenerator; 19-combustion chamber; 20-high-energy igniter; 21-high-temperature fuel gas; 22-atmosphere; 23-evaporator; 24-Ⅰ-stage drive pump; 25-Ⅱ-stage drive pump; 26-Ⅰ-stage circulating medium; 27-Ⅱ-stage circulating medium; 28 -Ⅰstage expander; 29-sliding bearing; 30-Ⅱstage expander; 31-rotor 2; 32-air-cooled generator 2; 33-condenser; 34-fuel tank; 35-condensate pump; 36-condensing working fluid; 17-1-hot air heat exchange channel; 17-2-Ⅰstage circulating working fluid high temperature heat exchange section channel; 17-3-Ⅱstage circulating working fluid low temperature heat exchange section channel; 23-1-hot gas heat exchange channel; 23-2-Ⅰstage circulating working fluid high temperature evaporation section channel; 23-3-Ⅱstage circulating working fluid low temperature evaporation section channel; 33-1-condensing working fluid heat exchange channel; 33-2-Ⅰstage circulating working fluid high temperature condensation section channel; 33-3-Ⅱstage circulating working fluid low temperature condensation section channel. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] like Figure 1 As shown, a mobile combined cycle power generation system includes a single-stage micro gas turbine generator subsystem 1, a two-stage organic Rankine cycle generator subsystem 2 and a battery pack 3, wherein the single-stage micro gas turbine generator subsystem 1 includes a first-stage compressor 7, a second-stage compressor 8, a combustion chamber 19, a turbine 10, a regenerator 18, a heat exchanger 13, a second heat exchanger 17, an air-cooled generator 11, a rotor 19 and a fuel pump 16; the two-stage organic Rankine cycle generator subsystem includes a first-stage driving pump 24, a second-stage driving pump 25, a first-stage circulating medium 26, a second-stage circulating medium 27, an evaporator 23, a first-stage expander 28, a second-stage expander 30, a condenser 33, a condensation pump 35, a fuel tank 34, a second rotor 31 and an air-cooled generator 2 32;

[0036] The first-stage compressor 7, the second-stage compressor 8, the turbine 10 and the air-cooled generator 11 are arranged in sequence and share a rotor 9; the first-stage expander 28, the second-stage expander 30 and the air-cooled generator 2 32 are arranged in sequence and share a rotor 2 31;

[0037] The air inlet of the first-stage compressor 7 is connected to the air 5, and the pressurized air 5 is divided into two parts: cooling air 12 and working air 14. The air outlet of the first-stage compressor 7 is respectively connected to the hot fluid inlet of the heat exchanger 13 and the hot fluid inlet of the heat exchanger 2 17; the hot fluid outlet of the heat exchanger 13 discharges the cooled cooling air 12, the cold fluid inlet of the heat exchanger 13 is connected to the outlet of the fuel pump 16, and the cold fluid outlet of the heat exchanger 13 is connected to the combustion chamber 19; the heat exchanger 2 1 The hot fluid outlet of 7 is communicated with the air inlet of the second-stage compressor 8, the air outlet of the second-stage compressor 8 is communicated with the cold fluid inlet of the regenerator 18, the cold fluid outlet of the regenerator 18 is communicated with the combustion chamber 19, the high-temperature combustion gas 21 generated by the combustion chamber 19 enters the turbine 10 to perform work, the air outlet of the turbine 10 is communicated with the hot fluid inlet of the regenerator 18, the hot fluid outlet of the regenerator 18 is communicated with the hot fluid inlet of the evaporator 23, and the hot fluid outlet of the evaporator 23 is communicated with the atmosphere 22;

[0038] The fuel tank 34 provides the fuel 15 to the fuel pump 16, and the fuel tank 34 is connected with the condensate pump 35, and the condensate pump 35 is connected with the cold fluid inlet of the condenser 33. The fuel passing through the condensate pump 35 is the condensed working medium 36, and the cold fluid outlet of the condenser 33 is connected with the inlet of the fuel tank 34. The hot fluid high-temperature condensation section of the condenser 33 is connected with the first-stage driving pump 24, the hot fluid high-temperature heat exchange section of the heat exchanger 17, the cold fluid high-temperature evaporation section of the evaporator 23 and the first-stage expansion machine 28 in sequence to form a circulation loop of the first-stage circulating working medium 26, and the hot fluid low-temperature condensation section of the condenser 33 is connected with the second-stage driving pump 25, the cold fluid low-temperature heat exchange section of the heat exchanger 17, the cold fluid low-temperature evaporation section of the evaporator 23 and the second-stage expansion machine 30 in sequence to form a circulation loop of the second-stage circulating working medium 27;

[0039] The air-cooled generator 1 11 and the air-cooled generator 2 32 both supply power to the battery pack 3, and the battery pack 3 supplies power to the power-consuming side 4. When the power level of the battery pack 3 is lower than 20%-30%, the single-stage micro gas turbine power generation subsystem 1 and the two-stage organic Rankine cycle power generation subsystem 2 are started and operate under rated conditions to charge the battery pack 3. The air-cooled generator 1 11 is used as a starter when the single-stage micro gas turbine power generation subsystem 1 is started, and the battery pack 3 supplies power to the starter. The power generation efficiency of the air-cooled generator 1 11 and the air-cooled generator 2 32 is 95%-99%.

[0040] The hot fluid in the heat exchanger 13 is cooling air 12, and the cold fluid is fuel 15; the hot fluid in the heat exchanger 2 17 is working air 14, the cold fluid in the high-temperature heat exchange section is the I-level circulating medium 26, and the cold fluid in the low-temperature heat exchange section is the II-level circulating medium 27; the hot fluid in the regenerator 18 is high-temperature fuel gas 21, and the cold fluid is working air 14; the hot fluid in the evaporator 23 is high-temperature fuel gas 21, the cold fluid in the high-temperature evaporation section is the I-level circulating medium 26, and the cold fluid in the low-temperature evaporation section is the II-level circulating medium 27. The hot fluid in the high-temperature condensation section of the condenser 33 is the I-level circulating medium 26, the hot fluid in the low-temperature condensation section is the II-level circulating medium 27, and the cold fluid is the condensing medium 36.

[0041] like Figure 2-Figure 4 As shown, the specific structures of the heat exchanger 17, the evaporator 23 and the condenser 33 are as follows:

[0042] The heat exchanger 2 17 includes a hot air heat exchange channel 17-1, a high-temperature heat exchange section channel 17-2 for the first-stage circulating working medium, and a low-temperature heat exchange section channel 17-3 for the second-stage circulating working medium, and the hot air heat exchange channel 17-1 exchanges heat with the high-temperature heat exchange section channel 17-2 for the first-stage circulating working medium and the low-temperature heat exchange section channel 17-3 for the second-stage circulating working medium at the same time, and the high-temperature heat exchange section channel 17-2 for the first-stage circulating working medium and the low-temperature heat exchange section channel 17-3 for the second-stage circulating working medium are independent of each other and are not connected;

[0043] The evaporator 23 includes a hot gas heat exchange channel 23-1, a high-temperature evaporation section channel 23-2 for the first-stage circulating working medium, and a low-temperature evaporation section channel 23-3 for the second-stage circulating working medium, and the hot gas heat exchange channel 23-1 exchanges heat with the high-temperature evaporation section channel 23-2 for the first-stage circulating working medium and the low-temperature evaporation section channel 23-3 for the second-stage circulating working medium at the same time, and the high-temperature evaporation section channel 23-2 for the first-stage circulating working medium and the low-temperature evaporation section channel 23-3 for the second-stage circulating working medium are independent of each other and are not connected;

[0044] The condenser 33 includes a condensing working fluid heat exchange channel 33-1, a first-stage circulating working fluid high-temperature condensation section channel 33-2 and a second-stage circulating working fluid low-temperature condensation section channel 33-3, and the condensing working fluid heat exchange channel 33-1 simultaneously exchanges heat with the first-stage circulating working fluid high-temperature condensation section channel 33-2 and the second-stage circulating working fluid low-temperature condensation section channel 33-3, and the first-stage circulating working fluid high-temperature condensation section channel 33-2 and the second-stage circulating working fluid low-temperature condensation section channel 33-3 are independent of each other and not connected; the above arrangement realizes accurate energy cascade utilization and greatly improves power generation efficiency while ensuring the overall integration, miniaturization and mobility of the system.

[0045] The rotor 1 9 is supported by an air bearing 6, and the rotor 2 31 is supported by a sliding bearing 29; the rotation speed of the rotor 1 9 is set to 40000-60000 rpm; the rotation speed of the rotor 2 31 is set to 2000-4000 rpm.

[0046] The combustion chamber 19 is equipped with a high-energy igniter 20, which is powered by the battery pack 3 and runs for 5-10 seconds when the combustion chamber 19 is ignited, and its spark energy is 10-15J.

[0047] The combustion chamber 19 is configured as a lean premixed combustion chamber, and its combustion efficiency is 98%-99%. The working air 14 is divided into combustion air and mixing air in the combustion chamber 19. The combustion air enters the flame tube through the 2-3 level air swirler at the head of the combustion chamber 19, and reacts chemically with the fuel 15 to generate a large amount of high-temperature combustion gas 21. The mixing air enters the flame tube through the mixing hole at the rear of the combustion chamber 19, cools the high-temperature combustion gas 21, and protects the flame tube from being burned. The temperature of the high-temperature combustion gas 21 at the outlet of the combustion chamber 19 is 850-900°C, and the pressure loss of the combustion chamber 19 is 3%-5%.

[0048] The air 5 of the present application is pressurized by the first-stage compressor 7 and then divided into two parts: cooling air 12 and working air 14. The flow rate of air 5 is 1.5-2kg / s, the temperature is 15-25°C, and the pressure is normal pressure; the first-stage compressor 7 is a single-stage centrifugal compressor with a pressure ratio of 1.8-2.2, an isentropic efficiency of 0.7-0.8, and a mechanical efficiency of 0.96-0.98. The flow rate of cooling air 12 accounts for 3%-7% of the flow rate of air 5; the cooling air 12 is cooled by the heat exchanger 13 and then input into the coils of the air bearing 6, the air-cooled generator 11 and the air-cooled generator 2 32; the working air 14 is cooled by the heat exchanger 2 17 and then enters the second-stage compressor 8 for pressurization, and then enters the combustion chamber 19 after being heated by the regenerator 18;

[0049] The pressure loss of the hot and cold fluids of the heat exchanger 2 17 is 0.5%-1%, the inlet temperature of the hot fluid is 100-110°C, and the outlet temperature of the hot fluid is 70-90°C. The second-stage compressor 8 is a single-stage centrifugal compressor with a pressure ratio of 2-2.2, an isentropic efficiency of 0.7-0.8, and a mechanical efficiency of 0.96-0.98. The pressure loss of the hot and cold fluids of the regenerator 18 is 0.5%-1%, the inlet temperature of the hot fluid is 610-620°C, the outlet temperature of the hot fluid is 250-300°C, the inlet temperature of the cold fluid is 190-200°C, and the outlet temperature of the cold fluid is 520-540°C.

[0050] After the high-temperature combustion gas 21 is expanded and works in the turbine 10, it is cooled in the regenerator 18 and the evaporator 23 and discharged to the atmosphere 22. The expansion ratio of the turbine 10 is 3.8-4, the isentropic efficiency is 0.8-0.85, and the mechanical efficiency is 0.96-0.98. The pressure loss of the cold and hot fluids in the evaporator 23 is 0.5%-1%, and the outlet temperature of the hot fluid is 90-100°C;

[0051] The fuel 15 can be ethanol, gasoline, diesel, etc. The fuel 15 in the fuel tank 34 is pressurized by the fuel pump 16, enters the heat exchanger 13 to increase the temperature, and then enters the combustion chamber 19. The flow rate of the fuel 15 is 0.02-0.03 kg / s. The volume of the fuel tank 34 is 300-500 L. The outlet pressure of the fuel pump 16 is 9-11 bar, the hydraulic efficiency is 0.65-0.75, and the driving machine efficiency is 0.94-0.98;

[0052] The first-stage circulating medium 26 and the second-stage circulating medium 27 of the two-stage organic Rankine cycle power generation subsystem 2 can be n-pentane, R245FA, water, etc. The first-stage circulating medium 26 and the second-stage circulating medium 27 are pressurized by the first-stage driving pump 24 and the second-stage driving pump 25 respectively, and are heated by the heat exchanger 17, and then enter the evaporator 23 for heat exchange and evaporation, and then enter the condenser 33 for cooling and liquefaction after passing through the first-stage expansion machine 28 and the second-stage expansion machine 30 to do work, and complete a cycle of work; the condensed working medium 36 is the same as the fuel 15, and the condensed working medium 36 is pressurized by the condensation pump 35, and flows back to the fuel tank 34 through the condenser 33.

[0053] The two-stage organic Rankine cycle power generation subsystem 2 of the present application uses a common heat exchanger 2 17 to heat the first-stage circulating working fluid 26 and the second-stage circulating working fluid 27 in sections, and cools the working air 14, thereby reducing the power consumption of the second-stage compressor 8. The first-stage circulating working fluid 26 is heated and heated in the first-stage circulating working fluid high-temperature heat exchange section channel 17-2 of the heat exchanger 2 17, and the second-stage circulating working fluid 27 is heated and heated in the second-stage circulating working fluid low-temperature heat exchange section channel 17-3 of the heat exchanger 2 17; the two-stage organic Rankine cycle power generation subsystem 2 uses a common evaporator 23 to heat and evaporate the first-stage circulating working fluid 26 and the second-stage circulating working fluid 27 in sections. The first-stage circulating medium 26 is heat exchanged and vaporized in the first-stage circulating medium high-temperature evaporation section channel 23-2 of the evaporator 23, and the second-stage circulating medium 27 is heat exchanged and vaporized in the second-stage circulating medium low-temperature evaporation section channel 23-3 of the evaporator 23; the two-stage organic Rankine cycle power generation subsystem 2 uses a common condenser 33 to cool and condense the first-stage circulating medium 26 and the second-stage circulating medium 27 in sections. The first-stage circulating medium 26 is cooled and condensed in the first-stage circulating medium high-temperature condensation section channel 33-2 of the condenser 33, and the second-stage circulating medium 27 is cooled and condensed in the second-stage circulating medium low-temperature condensation section channel 33-3 of the condenser 33.

[0054] The outlet pressure of the first-stage driving pump 24 is 18-22 bar, the hydraulic efficiency is 0.65-0.75, and the driving machine efficiency is 0.94-0.98. The outlet pressure of the second-stage driving pump 25 is 4-6 bar, the hydraulic efficiency is 0.65-0.75, and the driving machine efficiency is 0.94-0.98.

[0055] The flow ratio of the first-stage circulating working medium 26 and the second-stage circulating working medium 27 is 2.5-3:1; the outlet temperature of the first-stage circulating working medium 26 in the cold fluid high-temperature heat exchange section of the heat exchanger 2 17 is 60-65°C, the outlet temperature of the cold fluid high-temperature evaporation section of the evaporator 23 is 150-170°C, and the outlet temperature of the hot fluid high-temperature condensation section of the condenser 33 is 30-40°C; the outlet temperature of the second-stage circulating working medium 27 in the cold fluid low-temperature heat exchange section of the heat exchanger 2 17 is 70-80°C, the outlet temperature of the cold fluid low-temperature evaporation section of the evaporator 23 is 90-95°C, and the outlet temperature of the hot fluid low-temperature condensation section of the condenser 33 is 30-40°C;

[0056] The pressure ratio of the first-stage expander 28 is 17.5-21.3, the isentropic efficiency is 0.8-0.9, and the mechanical efficiency is 0.96-0.98. The pressure ratio of the second-stage expander 30 is 3.9-5.8, the isentropic efficiency is 0.8-0.9, and the mechanical efficiency is 0.96-0.98.

[0057] The flow rate of the condensing medium 36 is 5-10 kg / s. The outlet pressure of the condensing pump 35 is 1.05-1.15 bar. The cold fluid inlet temperature of the condenser 33 is 18-22°C, and the cold fluid outlet temperature is 30-37°C.

[0058] The mobile combined cycle power generation system of the present application has a power generation efficiency of 30%-34% and a power generation capacity of 200-250kW. The power generation ratio of the single-stage micro gas turbine power generation subsystem 1 and the two-stage organic Rankine cycle power generation subsystem 2 is 2-4:1; the capacity of the battery pack 3 is 100-200kWh, and the single operation time is 24-60min to fully charge the battery pack 3.

[0059] The following is an example of specific parameters of a mobile combined cycle power generation system:

[0060] The speed of rotor 19 is set to 42000rpm, the speed of rotor 231 is set to 3000rpm, and the power generation efficiency of air-cooled generator 11 and air-cooled generator 232 is 98%. The flow rate of air 5 is 1.7kg / s, the temperature is 20℃, and the pressure is normal pressure. The pressure loss of hot and cold fluids in heat exchanger 13 is 1%, the inlet temperature of hot fluid is 105℃, the outlet temperature of hot fluid is 45℃, the inlet temperature of cold fluid is 20℃, and the outlet temperature of cold fluid is 80℃; the pressure loss of cold fluid in heat exchanger 217 is 0.5%, the pressure loss of hot fluid is 1%, the inlet temperature of hot fluid is 105℃, and the outlet temperature of hot fluid is 85℃. The second-stage compressor 8 is a single-stage centrifugal compressor with a pressure ratio of 2.14, an isentropic efficiency of 0.75, and a mechanical efficiency of 0.98. The pressure loss of the hot and cold fluids of the regenerator 18 is 1%, the inlet temperature of the hot fluid is 619°C, the outlet temperature of the hot fluid is 300°C, the inlet temperature of the cold fluid is 193°C, and the outlet temperature of the cold fluid is 530°C. The fuel 15 is ethanol with a flow rate of 0.0275 kg / s. The volume of the fuel tank 34 is 400 L. The outlet pressure of the fuel pump 16 is 10 bar, the hydraulic efficiency is 0.69, and the driving machine efficiency is 0.96. The combustion chamber 19 is set as a lean premixed combustion chamber with a combustion efficiency of 99%; the high-energy igniter 20 is powered by the battery pack 3 and runs for 8 seconds when the combustion chamber 19 is ignited, and its electric spark energy is 12 J; the temperature of the high-temperature combustion gas 21 at the outlet of the combustion chamber 19 is 900°C, and the pressure loss of the combustion chamber 19 is 3%. The expansion ratio of the turbine 10 is 3.912, the isentropic efficiency is 0.845, and the mechanical efficiency is 0.98. The pressure loss of the cold and hot fluids of the evaporator 23 is 1%, and the outlet temperature of the hot fluid is 97°C. The first-stage circulating working fluid 26 and the second-stage circulating working fluid 27 of the two-stage organic Rankine cycle power generation subsystem 2 are n-pentane. The outlet pressure of the first-stage driving pump 24 is 20 bar, the hydraulic efficiency is 0.69, and the driving machine efficiency is 0.96. The outlet pressure of the second-stage driving pump 25 is 5.2 bar, the hydraulic efficiency is 0.69, and the driving machine efficiency is 0.96. The flow ratio of the first-stage circulating working fluid 26 and the second-stage circulating working fluid 27 is 2.67:1. The flow rate of the first-stage circulating medium is 0.56 kg / s, and the flow rate of the second-stage circulating medium is 0.21 kg / s; the outlet temperature of the high-temperature heat exchange section of the cold fluid of the first-stage circulating medium 26 in the heat exchanger 2 17 is 62°C, the outlet temperature of the high-temperature evaporation section of the cold fluid in the evaporator 23 is 162°C, and the outlet temperature of the high-temperature condensation section of the hot fluid in the condenser 33 is 35°C; the outlet temperature of the low-temperature heat exchange section of the cold fluid of the second-stage circulating medium 27 in the heat exchanger 2 17 is 75°C, the outlet temperature of the low-temperature evaporation section of the cold fluid in the evaporator 23 is 94°C, and the outlet temperature of the low-temperature condensation section of the hot fluid in the condenser 33 is 35°C. The pressure ratio of the first-stage expander 28 is 19.51, the isentropic efficiency is 0.845, and the mechanical efficiency is 0.98. The pressure ratio of the second-stage expander 30 is 5.1, the isentropic efficiency is 0.845, and the mechanical efficiency is 0.98. The condensing medium 36 is ethanol, and the flow rate is 10 kg / s.The outlet pressure of the condensate pump 35 is 1.1 bar. The cold fluid inlet temperature of the condenser 33 is 20°C, and the cold fluid outlet temperature is 31°C.

[0061] The power generation efficiency of a mobile combined cycle power generation system with the above parameters is 32.4%, and the power generation is 240kW. The power generation ratio of the single-stage micro gas turbine power generation subsystem 1 and the two-stage organic Rankine cycle power generation subsystem 2 is 3:1. The capacity of the battery pack 3 is 150kWh. When the power of the battery pack 3 is less than 20%, the single-stage micro gas turbine power generation subsystem 1 and the two-stage organic Rankine cycle power generation subsystem 2 are started. The single operation time is 30min to fully charge the battery pack 3.

[0062] This application ensures the mobility of the system from two aspects: system integrated design and reduction of operating equipment; from the aspect of energy cascade utilization, it fully utilizes the high and low temperature characteristics of the working fluid, uses precise energy cascade utilization logic and reasonable energy loss schemes to improve the work of the turbine and expander, reduce the power consumption of the compressor and pump, reduce fuel consumption, and ultimately maximize power generation efficiency.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mobile combined cycle power generation system, characterized in that: The invention comprises a single-stage micro gas turbine generator subsystem (1), a two-stage organic Rankine cycle generator subsystem (2) and a battery pack (3), wherein the single-stage micro gas turbine generator subsystem (1) comprises a first-stage compressor (7), a second-stage compressor (8), a combustion chamber (19), a turbine (10), a regenerator (18), a heat exchanger 1 (13), a second heat exchanger (17), an air-cooled generator 1 (11), a rotor 1 (9) and a fuel pump (16); the two-stage organic Rankine cycle generator subsystem comprises a first-stage driving pump (24), a second-stage driving pump (25), a first-stage circulating medium (26), a second-stage circulating medium (27), an evaporator (23), a first-stage expander (28), a second-stage expander (30), a condenser (33), a condensation pump (35), a fuel tank (34), a second rotor (31) and an air-cooled generator 2 (32); The first-stage compressor (7), the second-stage compressor (8), the turbine (10) and the first air-cooled generator (11) are arranged in sequence and share the first rotor (9); the first-stage expander (28), the second-stage expander (30) and the second air-cooled generator (32) are arranged in sequence and share the second rotor (31); The air inlet of the first stage compressor (7) is connected to the air (5), and the pressurized air (5) is divided into cooling air (12) and working air (14). The air outlet of the first stage compressor (7) is respectively connected to the hot fluid inlet of the first heat exchanger (13) and the hot fluid inlet of the second heat exchanger (17); the hot fluid outlet of the first heat exchanger (13) discharges the cooled cooling air (12), the cold fluid inlet of the first heat exchanger (13) is connected to the outlet of the fuel pump (16), and the cold fluid outlet of the first heat exchanger (13) is connected to the combustion chamber (19); the second heat exchanger (17) The hot fluid outlet of the second stage compressor (8) is connected to the air inlet of the second stage compressor (8), the air outlet of the second stage compressor (8) is connected to the cold fluid inlet of the regenerator (18), the cold fluid outlet of the regenerator (18) is connected to the combustion chamber (19), the high temperature combustion gas (21) generated by the combustion chamber (19) enters the turbine (10) to perform work, the air outlet of the turbine (10) is connected to the hot fluid inlet of the regenerator (18), the hot fluid outlet of the regenerator (18) is connected to the hot fluid inlet of the evaporator (23), and the hot fluid outlet of the evaporator (23) is connected to the atmosphere (22); The fuel tank (34) provides the fuel pump (16) with fuel (15). The fuel tank (34) is connected to the condensation pump (35). The condensation pump (35) is connected to the cold fluid inlet of the condenser (33). The fuel passing through the condensation pump (35) is the condensed working medium (36). The cold fluid outlet of the condenser (33) is connected to the inlet of the fuel tank (34). The high-temperature condensation section of the condenser (33) is connected to the first-stage driving pump (24), the high-temperature heat exchange section of the second heat exchanger (17), the high-temperature evaporation section of the evaporator (23) and the first-stage expansion machine (28) in sequence to form a circulation loop of the first-stage circulating working medium (26). The low-temperature condensation section of the condenser (33) is connected to the second-stage driving pump (25), the low-temperature heat exchange section of the second heat exchanger (17), the low-temperature evaporation section of the evaporator (23) and the second-stage expansion machine (30) in sequence to form a circulation loop of the second-stage circulating working medium (27). The air-cooled generator one (11) and the air-cooled generator two (32) both supply power to the battery pack (3), and the battery pack (3) supplies power to the power-consuming side (4).

2. A mobile combined cycle power generation system according to claim 1, characterized in that: The hot fluid in the heat exchanger 1 (13) is cooling air (12), and the cold fluid is fuel (15); the hot fluid in the heat exchanger 2 (17) is working air (14), the cold fluid in the high-temperature heat exchange section is a Class I circulating medium (26), and the cold fluid in the low-temperature heat exchange section is a Class II circulating medium (27); the hot fluid in the regenerator (18) is high-temperature fuel gas (21), and the cold fluid is working air (14); the hot fluid in the evaporator (23) is high-temperature fuel gas (21), the cold fluid in the high-temperature evaporation section is a Class I circulating medium (26), and the cold fluid in the low-temperature evaporation section is a Class II circulating medium (27); the hot fluid in the high-temperature condensation section of the condenser (33) is a Class I circulating medium (26), the hot fluid in the low-temperature condensation section is a Class II circulating medium (27), and the cold fluid is a condensing medium (36).

3. A mobile combined cycle power generation system according to claim 2, characterized in that: The heat exchanger 2 (17) comprises a hot air heat exchange channel (17-1), a first-stage circulating working medium high-temperature heat exchange section channel (17-2) and a second-stage circulating working medium low-temperature heat exchange section channel (17-3), and the hot air heat exchange channel (17-1) simultaneously exchanges heat with the first-stage circulating working medium high-temperature heat exchange section channel (17-2) and the second-stage circulating working medium low-temperature heat exchange section channel (17-3), and the first-stage circulating working medium high-temperature heat exchange section channel (17-2) and the second-stage circulating working medium low-temperature heat exchange section channel (17-3) are independent of each other and are not connected.

4. A mobile combined cycle power generation system according to claim 3, characterized in that: The evaporator (23) comprises a hot gas heat exchange channel (23-1), a first-stage circulating working medium high-temperature evaporation section channel (23-2) and a second-stage circulating working medium low-temperature evaporation section channel (23-3), and the hot gas heat exchange channel (23-1) simultaneously exchanges heat with the first-stage circulating working medium high-temperature evaporation section channel (23-2) and the second-stage circulating working medium low-temperature evaporation section channel (23-3), and the first-stage circulating working medium high-temperature evaporation section channel (23-2) and the second-stage circulating working medium low-temperature evaporation section channel (23-3) are independent of each other and are not connected.

5. A mobile combined cycle power generation system according to claim 4, characterized in that: The condenser (33) comprises a condensing working fluid heat exchange channel (33-1), a first-stage circulating working fluid high-temperature condensation section channel (33-2) and a second-stage circulating working fluid low-temperature condensation section channel (33-3), and the condensing working fluid heat exchange channel (33-1) simultaneously exchanges heat with the first-stage circulating working fluid high-temperature condensation section channel (33-2) and the second-stage circulating working fluid low-temperature condensation section channel (33-3), and the first-stage circulating working fluid high-temperature condensation section channel (33-2) and the second-stage circulating working fluid low-temperature condensation section channel (33-3) are independent of each other and are not connected.

6. The mobile combined cycle power generation system according to claim 1, characterized in that: The rotor 1 (9) is supported by an air bearing (6), and the rotor 2 (31) is supported by a sliding bearing (29).

7. The mobile combined cycle power generation system according to claim 6, characterized in that: The cooling air (12) discharged from the hot fluid outlet of the heat exchanger 1 (13) is input into the air bearing (6) and the coils of the air-cooled generator 1 (11) and the air-cooled generator 2 (32) through the pipeline.

8. The mobile combined cycle power generation system according to claim 1, characterized in that: The combustion chamber (19) is equipped with a high-energy igniter (20), and the high-energy igniter (20) is powered by a battery pack (3).

9. A mobile combined cycle power generation system according to any one of claim 1, characterized in that: The combustion chamber (19) is configured as a lean premixed combustion chamber.

10. The mobile combined cycle power generation system according to claim 1, characterized in that: The volume of the fuel tank (34) is 300-500L; the capacity of the battery pack (3) is 100-200kWh.

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