CN110953069A - Multi-energy coupling power generation system of gas turbine power station - Google Patents
Multi-energy coupling power generation system of gas turbine power station Download PDFInfo
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- CN110953069A CN110953069A CN201911307851.XA CN201911307851A CN110953069A CN 110953069 A CN110953069 A CN 110953069A CN 201911307851 A CN201911307851 A CN 201911307851A CN 110953069 A CN110953069 A CN 110953069A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
- F02C7/143—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages
Abstract
The invention discloses a multi-energy coupling power generation system of a gas turbine power station, which comprises a voltage regulating subsystem and a gas turbine power generation subsystem; the inlet end of the drying device is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device is connected with the inlet end of a first turbo expander, and the outlet end of the first turbo expander is connected with a first generator; the outlet end of the first turbo expander is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber; the air inlet end of the heat exchange device is connected with the high-temperature air conveying pipeline, the air outlet end of the heat exchange device is connected with the inlet end of the first compressor, the outlet end of the first compressor is connected with the air inlet end of the combustion chamber, the outlet end of the combustion chamber is connected with the inlet end of the gas turbine, and the outlet end of the gas turbine is connected with the second generator. The embodiment of the invention realizes the coupling utilization of pressure energy, cold energy and heat energy, and has the advantages of high energy utilization rate and good economical efficiency of a power plant.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a multi-energy coupling power generation system of a gas turbine power station.
Background
In a gas turbine power plant, because a gas turbine has certain requirements on intake parameters (including pressure, temperature and the like) of natural gas, a generator set cannot directly utilize the natural gas from a gas supply end station to generate electricity, and a pressure regulating station is required to be arranged between the gas supply end station and an inlet of a gas turbine. Typically, the natural gas pipeline pressure is higher than the engine intake pressure. The natural gas is regulated through the throttle valve in the traditional design, and the requirement of the gas inlet pressure of the gas turbine is met. The reduction in pressure of the natural gas as it passes through the pressure regulating station causes its temperature to decrease, according to the joule-thomson effect. In order to avoid condensation and prevent the faults of the pressure regulating unit at low temperature and simultaneously achieve the temperature requirement required by the air inlet of the gas turbine, a natural gas heating unit is required.
It can be known from engineering thermodynamic theory that when natural gas has certain pressure and temperature, the natural gas has certain energy, i.e. potential energy represented by pressure and kinetic energy represented by temperature, which are collectively called as internal energy of the natural gas. When the throttle valve is used for pressure regulation, the pressure energy of the high-pressure natural gas and the cold energy are not utilized, and the extra energy is consumed to heat the natural gas, so that the method is quite uneconomical.
In addition, gas turbines are volumetric devices whose performance is related to the ambient temperature. When the ambient temperature rises, the air density is reduced, the air quality entering the air compressor and the gas turbine is reduced, and the output of the gas turbine is reduced; the compression ratio of the gas compressor is reduced due to the rise of the environmental temperature, so that the work load of the gas turbine is reduced; meanwhile, the power consumption of the gas compressor is increased, so that the output of the gas turbine is further reduced. The output power of the ambient air decreases by 1% for every 1 ℃ rise in temperature. The gas turbine power station which accounts for 30% of the total installed capacity in China is concentrated in Yangtze river delta and Zhujiang delta areas with higher temperature all the year round, the output of a gas turbine is obviously reduced in a high-temperature period, and the efficiency of the power station is reduced. The basic principle of the air inlet cooling system is that the air inlet temperature of the gas turbine is reduced, the density of air is increased, and the mass flow of inlet air is improved, so that the output of the gas turbine is increased; and the power consumption of the compressor is reduced along with the reduction of the temperature of the inlet air.
Therefore, the prior art natural gas power generation system has the following drawbacks:
(1) the throttle valve is used for regulating the pressure, so that the pressure energy and the cold energy of the high-pressure natural gas are wasted, and extra energy is consumed for heating the natural gas, so that the natural gas heating device is quite uneconomical;
(2) the compression type refrigeration is adopted for cooling the air at the inlet of the combustion engine, so that the cost is high in the consumption of a large amount of electric power, and the economy is not high;
(3) the absorption refrigeration is adopted for cooling air at the inlet of the gas turbine, if hot water is adopted as a heat source, the refrigeration efficiency is lower, the output improvement on the gas turbine is limited, and meanwhile, the power consumption of a circulating pump additionally arranged in the system is considered, so that the efficiency improvement of the system is not obvious in general; if the heat source adopts steam, the steam inlet quantity of a steam turbine in the combined cycle is reduced, the output of the steam turbine is reduced, and the total output of the combined cycle is increased little.
Disclosure of Invention
The invention provides a multi-energy coupling power generation system of a gas turbine power station, which aims to solve the problems in the prior art, realizes the coupling utilization of pressure energy, cold energy and heat energy aiming at the gas turbine power station, and has the advantages of high energy utilization rate and good economical efficiency of a power plant.
In order to solve the above technical problem, an embodiment of the present invention provides a multi-energy coupling power generation system for a combustion engine power station, including:
the pressure regulating subsystem comprises a drying device, a first turbine expansion machine, a first generator and a heat exchange device;
the gas turbine power generation subsystem comprises a first compressor, a combustion chamber, a gas turbine and a second generator;
the inlet end of the drying device is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device is connected with the inlet end of the first turbo expander, and the outlet end of the first turbo expander is connected with the first generator;
the outlet end of the first turboexpander is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber;
the air inlet end of the heat exchange device is connected with a high-temperature air conveying pipeline, the air outlet end of the heat exchange device is connected with the inlet end of the first compressor, the outlet end of the first compressor is connected with the air inlet end of the combustion chamber, the outlet end of the combustion chamber is connected with the inlet end of the gas turbine, and the outlet end of the gas turbine is connected with the second generator.
In one embodiment, the pressure regulating subsystem further comprises a pressure reducing bypass device;
the inlet end of the pressure reducing bypass device is connected with the outlet end of the drying device, and the outlet end of the pressure reducing bypass device is connected with the natural gas inlet end of the combustion chamber.
In one embodiment, the heat exchange device comprises a first heat exchanger;
the natural gas inlet end of the first heat exchanger is connected with the outlet end of the first turboexpander, and the natural gas outlet end of the first heat exchanger is connected with the natural gas inlet end of the combustion chamber;
the air inlet end of the first heat exchanger is connected with the high-temperature air conveying pipeline, and the air outlet end of the first heat exchanger is connected with the inlet end of the first compressor;
the first heat exchanger has a condensed water drain part.
In one embodiment, the gas turbine power plant multi-energy coupling power generation system further comprises a compression refrigeration subsystem;
the compression refrigeration subsystem includes a second heat exchanger;
the pressure regulating subsystem further comprises a second turbine expander, and the gas turbine power generation subsystem further comprises a third generator;
the heat exchange device comprises a first heat exchanger and a second heat exchanger;
the outlet end of the first turboexpander is connected with the natural gas inlet end of the first heat exchanger, the natural gas outlet end of the first heat exchanger is connected with the natural gas inlet end of the combustion chamber, the air inlet end of the first heat exchanger is connected with the high-temperature air conveying pipeline, the air outlet end of the first heat exchanger is connected with the air inlet end of the second heat exchanger, and the air outlet end of the second heat exchanger is connected with the air inlet end of the first compressor;
the inlet end of the second turbo expander is connected with the outlet end of the first turbo expander, the outlet end of the second turbo expander is respectively connected with the third generator and the natural gas inlet end of the second heat exchanger, and the natural gas outlet end of the second heat exchanger is connected with a low-pressure gas pipe network.
In one embodiment, the gas turbine power plant multi-energy coupling power generation system further comprises a compression refrigeration subsystem;
the compression refrigeration subsystem comprises a second compressor, a condenser, a throttling device and an evaporator;
the heat exchange device comprises a first heat exchanger and a third heat exchanger;
the second compressor is arranged on a connecting pipeline between the outlet end of the first turbo expander and the first generator, the inlet end of the second compressor is respectively connected with the outlet end of the first turbo expander and the natural gas outlet end of the evaporator, the outlet end of the second compressor is respectively connected with the first generator and the condenser, and the condenser is connected to the natural gas inlet end of the evaporator through the throttling device;
the chilled water output end of the evaporator is connected with the fluid inlet end of the third heat exchanger, and the fluid outlet end of the third heat exchanger is connected with the chilled water return end of the evaporator;
the outlet end of the first turbo expander is connected with the natural gas inlet end of the first heat exchanger, and the natural gas outlet end of the first heat exchanger is connected with the natural gas inlet end of the combustion chamber; the air inlet end of the first heat exchanger is connected with the high-temperature air conveying pipeline, the air outlet end of the first heat exchanger is connected with the air inlet end of the third heat exchanger, and the air outlet end of the third heat exchanger is connected with the inlet end of the first compressor.
To sum up, the embodiment of the invention provides a multi-energy coupling power generation system for a gas turbine power station, which can realize coupling utilization of pressure energy, cold energy and heat energy and has the advantages of high energy utilization rate and good economical efficiency of a power plant.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas power generation system according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a natural gas power generation system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a natural gas power generation system according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a multi-energy coupling power generation system of a gas turbine power station, which can realize the coupling utilization of pressure energy, cold energy and heat energy and has the advantages of high energy utilization rate and good economical efficiency of a power plant. The technical solution of the present invention is explained in detail by selecting three of the many embodiments as follows.
The first embodiment is as follows:
referring to fig. 1, a first embodiment of the present invention provides a multi-energy coupling power generation system for a combustion engine power station, including:
the pressure regulating subsystem comprises a drying device 1, a first turbine expansion machine 2, a first generator 3 and a heat exchange device;
the gas turbine power generation subsystem comprises a first compressor 6, a combustion chamber 7, a gas turbine 8 and a second generator 9;
the inlet end of the drying device 1 is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device 1 is connected with the inlet end of a first turbo expander 2, and the outlet end of the first turbo expander 2 is connected with a first generator 3;
the outlet end of the first turbo expander 2 is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber 7;
the air inlet end of the heat exchange device is connected with a high-temperature air conveying pipeline, the air outlet end of the heat exchange device is connected with the inlet end of the first compressor 6, the outlet end of the first compressor 6 is connected with the air inlet end of the combustion chamber 7, the outlet end of the combustion chamber 7 is connected with the inlet end of the gas turbine 8, and the outlet end of the gas turbine 8 is connected with the second generator 9.
The heat exchange device of the first embodiment adopts a first heat exchanger 5;
the natural gas inlet end of the first heat exchanger 5 is connected with the outlet end of the first turbo expander 2, and the natural gas outlet end of the first heat exchanger 5 is connected with the natural gas inlet end of the combustion chamber 7;
the air inlet end of the first heat exchanger 5 is connected with a high-temperature air conveying pipeline, and the air outlet end of the first heat exchanger 5 is connected with the inlet end of the first compressor 6;
the first heat exchanger 5 has a condensed water drain part.
The pressure regulating subsystem also comprises a pressure reducing bypass device 4;
the inlet end of the decompression bypass device 4 is connected with the outlet end of the drying device 1, and the outlet end of the decompression bypass device 4 is connected with the natural gas inlet end of the combustion chamber 7.
In the first embodiment, the working process of the multi-energy coupling power generation system of the gas turbine power station is specifically as follows:
(1) high-pressure natural gas pipeline lets in drying device 1 with high-pressure natural gas 101, and drying device 1 is absorption formula drying system for carry out drying action to the natural gas, and the high-pressure natural gas after the drying lets in to first turbo expander 2 all the way, expands the step-down, and another way then lets in to decompression bypass device 4, and is reserve when 2 troubles or overhauls as first turbo expander to guarantee the continuous steady operation of system.
(2) After the high-pressure natural gas 101 is depressurized by the first turbo expander 2, the temperature is greatly reduced, and the high-pressure natural gas is heated in the first heat exchanger 5 to raise the temperature, so that medium-pressure high-temperature natural gas 103 is generated to meet the requirement of the inlet temperature of the gas turbine 8, and finally is sent to the combustion chamber 7 of the gas turbine power generation subsystem.
(3) The high-temperature air 201 absorbs the cold energy of the medium-pressure low-temperature natural gas 102 in the first heat exchanger 5, and enters the first compressor 6 of the combustion engine power generation unit after the temperature is reduced.
(4) The low-temperature air 202 is pressurized by a first compressor 6 of the gas turbine power generation unit, then mixed with medium-pressure high-temperature natural gas 103 in a combustion chamber 7 to be combusted to generate high-temperature flue gas, and then enters a gas turbine 8 to drive a second generator 9 to generate power.
Compared with the prior art, the multi-energy coupling power generation system of the gas turbine power station provided by the embodiment has the following beneficial effects:
1. the natural gas is regulated through the first turbo expander 1, the effect of natural gas pressure regulation (pressure reduction) can be realized, the pressure energy of the natural gas can be utilized, the first generator 3 is driven through the first turbo expander 1 to generate electricity, and the power output is increased. (utilization of pressure energy)
2. The first heat exchanger 5 is used for heating the depressurized natural gas, and simultaneously cooling the air, so that high-temperature and low-temperature heat exchange is realized.
3. After the natural gas is subjected to heat exchange and temperature rise in the first heat exchanger 5, the requirement of the inlet air temperature of the gas turbine 8 is met by utilizing heat energy, so that an additional heating unit is not needed, and the energy consumption is effectively reduced. (utilization of thermal energy)
4. After the air is cooled in the first heat exchanger 5, the output of the gas turbine 8 can be increased, and meanwhile, because the cooling can be realized without consuming extra energy, the energy (electric power or heating power) consumption can be effectively reduced. (utilization of Cold energy)
Example two:
referring to fig. 2, a second embodiment of the present invention provides a multi-energy coupling power generation system for a combustion engine power station, including:
the pressure regulating subsystem comprises a drying device 1, a first turbine expansion machine 2, a first generator 3, a second turbine expansion machine 11 and a heat exchange device, wherein the heat exchange device comprises a first heat exchanger 5 and a second heat exchanger 13;
the gas turbine power generation subsystem comprises a first compressor 6, a combustion chamber 7, a gas turbine 8, a second generator 9 and a third generator 12;
a compression refrigeration subsystem comprising a second heat exchanger 13;
the inlet end of the drying device 1 is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device 1 is connected with the inlet end of a first turbo expander 2, and the outlet end of the first turbo expander 2 is connected with a first generator 3;
the outlet end of the first turbo expander 2 is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber 7;
the air inlet end of the heat exchange device is connected with a high-temperature air conveying pipeline, the air outlet end of the heat exchange device is connected with the inlet end of the first compressor 6, the outlet end of the first compressor 6 is connected with the air inlet end of the combustion chamber 7, the outlet end of the combustion chamber 7 is connected with the inlet end of the gas turbine 8, and the outlet end of the gas turbine 8 is connected with the second generator 9.
The outlet end of the first turbo expander 2 is connected with the natural gas inlet end of the first heat exchanger 5, the natural gas outlet end of the first heat exchanger 5 is connected with the natural gas inlet end of the combustion chamber 7, the air inlet end of the first heat exchanger 5 is connected with a high-temperature air conveying pipeline, the air outlet end of the first heat exchanger 5 is connected with the air inlet end of the second heat exchanger 13, and the air outlet end of the second heat exchanger 13 is connected with the air inlet end of the first compressor 6;
the inlet end of the second turbo expander 11 is connected with the outlet end of the first turbo expander 2, the outlet end of the second turbo expander 11 is respectively connected with the natural gas inlet ends of the third generator 12 and the second heat exchanger 13, and the natural gas outlet end of the second heat exchanger 13 is connected with a low-pressure gas pipe network.
The pressure regulating subsystem also comprises a pressure reducing bypass device 4;
the inlet end of the decompression bypass device 4 is connected with the outlet end of the drying device 1, and the outlet end of the decompression bypass device 4 is connected with the natural gas inlet end of the combustion chamber 7.
In the second embodiment, the working process of the multi-energy coupling power generation system of the gas turbine power station is specifically as follows:
(1) high-pressure natural gas pipeline lets in drying device 1 with high-pressure natural gas 101, and drying device 1 is absorption formula drying system for carry out drying action to the natural gas, and the high-pressure natural gas after the drying lets in to first turbo expander 2 all the way, expands the step-down, and another way then lets in to decompression bypass device 4, and is reserve when 2 troubles or overhauls as first turbo expander to guarantee the continuous steady operation of system.
(2) The medium-pressure natural gas 102 output by the first turbo expander 2 is divided into two paths, one path enters the first heat exchanger 5, and the other path enters the second turbo expander 11 to continue expansion and pressure reduction, and simultaneously drives the third generator 12 to generate power.
(3) After the medium-pressure natural gas B path 301 is expanded and depressurized by the second turbo expander 11, the temperature is greatly reduced, the medium-pressure natural gas B path is heated and raised in temperature in the second heat exchanger 13 to generate low-pressure natural gas 302, and the low-pressure natural gas 302 enters a low-pressure gas pipe network.
(4) After the high-pressure natural gas 101 is depressurized by the first turbo expander 2, the temperature is greatly reduced, and the high-pressure natural gas is heated in the first heat exchanger 5 to raise the temperature, so that medium-pressure high-temperature natural gas 103 is generated to meet the requirement of the inlet temperature of the gas turbine 8, and finally is sent to the combustion chamber 7 of the gas turbine power generation subsystem.
(5) The high-temperature air 201 absorbs the cold energy of the medium-pressure low-temperature natural gas 102 in the first heat exchanger 5, the temperature of the high-temperature air is reduced, the high-temperature air enters the second heat exchanger 13, and the formed low-temperature air 202 enters the first compressor 6 of the combustion engine power generation unit.
(6) The low-temperature air 202 is pressurized by a first compressor 6 of the gas turbine power generation unit, then mixed with medium-pressure high-temperature natural gas 103 in a combustion chamber 7 to be combusted to generate high-temperature flue gas, and then enters a gas turbine 8 to drive a second generator 9 to generate power.
Compared with the prior art, the multi-energy coupling power generation system of the gas turbine power station provided by the embodiment II has the following beneficial effects:
1. the natural gas is regulated through the first turbo expander 1, the effect of natural gas pressure regulation (pressure reduction) can be realized, the pressure energy of the natural gas can be utilized, the first generator 3 is driven through the first turbo expander 1 to generate electricity, and the power output is increased. (utilization of pressure energy)
2. Utilize second turbo expander 11 to continue the pressure regulating (step down) to some natural gas, satisfy the low pressure gas demand, further utilize the pressure energy of natural gas simultaneously, drive third generator 12 through second turbo expander 11 and generate electricity, increase electric power output once more. (utilization of pressure energy)
3. The first heat exchanger 5 and the second heat exchanger 13 are used for heating the depressurized natural gas, and simultaneously cooling the air, so that high-temperature and low-temperature heat exchange is realized.
4. After the natural gas is subjected to heat exchange and temperature rise in the first heat exchanger 5, the requirement of the inlet air temperature of the gas turbine 8 is met by utilizing heat energy, so that an additional heating unit is not needed, and the energy consumption is effectively reduced. (utilization of thermal energy)
5. After the low-pressure gas is heated in the second heat exchanger 13, the operating temperature requirement of a low-pressure gas pipe network is met, and a heating unit is not required to be additionally added, so that the energy consumption is reduced. (utilization of thermal energy)
6. After the air is cooled in the first heat exchanger 5 and the second heat exchanger 13, the output of the gas turbine 8 can be increased, and meanwhile, because the cooling can be realized without consuming extra energy, the energy (electric power or heating power) consumption can be effectively reduced. (utilization of Cold energy)
Example three:
referring to fig. 3, a third embodiment of the present invention provides a multi-energy coupling power generation system for a combustion engine power station, including:
the pressure regulating subsystem comprises a drying device 1, a first turbine expansion machine 2, a first generator 3, a second turbine expansion machine 11 and a heat exchange device, wherein the heat exchange device comprises a first heat exchanger 5 and a third heat exchanger 25;
the gas turbine power generation subsystem comprises a first compressor 6, a combustion chamber 7, a gas turbine 8, a second generator 9 and a third generator 12;
a compression refrigeration subsystem comprising a second compressor 21, a condenser 22, a throttling device 23 and an evaporator 24;
the inlet end of the drying device 1 is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device 1 is connected with the inlet end of a first turbo expander 2, and the outlet end of the first turbo expander 2 is connected with a first generator 3;
the outlet end of the first turbo expander 2 is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber 7;
the air inlet end of the heat exchange device is connected with a high-temperature air conveying pipeline, the air outlet end of the heat exchange device is connected with the inlet end of the first compressor 6, the outlet end of the first compressor 6 is connected with the air inlet end of the combustion chamber 7, the outlet end of the combustion chamber 7 is connected with the inlet end of the gas turbine 8, and the outlet end of the gas turbine 8 is connected with the second generator 9.
The second compressor 22 is arranged on a connecting pipeline between the outlet end of the first turbo expander 2 and the first generator 3, the inlet end of the second compressor 21 is respectively connected with the outlet end of the first turbo expander 2 and the natural gas outlet end of the evaporator 24, the outlet end of the second compressor 21 is respectively connected with the first generator 3 and the condenser 22, and the condenser 22 is connected to the natural gas inlet end of the evaporator 24 through a throttling device 23;
the chilled water output end of the evaporator 24 is connected with the fluid inlet end of the third heat exchanger 25, and the fluid outlet end of the third heat exchanger 25 is connected with the chilled water return end of the evaporator 24;
the outlet end of the first turbo expander 2 is connected with the natural gas inlet end of the first heat exchanger 5, and the natural gas outlet end of the first heat exchanger 5 is connected with the natural gas inlet end of the combustion chamber 7; the air inlet end of the first heat exchanger 5 is connected with a high-temperature air conveying pipeline, the air outlet end of the first heat exchanger 5 is connected with the air inlet end of the third heat exchanger 25, and the air outlet end of the third heat exchanger 25 is connected with the inlet end of the first compressor 6.
The pressure regulating subsystem also comprises a pressure reducing bypass device 4;
the inlet end of the decompression bypass device 4 is connected with the outlet end of the drying device 1, and the outlet end of the decompression bypass device 4 is connected with the natural gas inlet end of the combustion chamber 7.
In the third embodiment, the working process of the multi-energy coupling power generation system of the gas turbine power station is specifically as follows:
(1) high-pressure natural gas pipeline lets in drying device 1 with high-pressure natural gas 101, and drying device 1 is absorption formula drying system for carry out drying action to the natural gas, and the high-pressure natural gas after the drying lets in to first turbo expander 2 all the way, expands the step-down, and another way then lets in to decompression bypass device 4, and is reserve when 2 troubles or overhauls as first turbo expander to guarantee the continuous steady operation of system.
(2) The medium-pressure natural gas 102 output by the first turbo expander 2 is divided into two paths, one path enters the first heat exchanger 5, the other path enters the second compressor 21, and meanwhile, the first generator 3 is driven to generate electricity.
(3) The high-pressure and high-temperature refrigerant gas 401 from the second compressor 21 is cooled to a normal-temperature and high-pressure refrigerant liquid 402 in the condenser 22, enters the expansion device 23 to be expanded and decompressed to form a low-temperature refrigerant gas 403, then enters the evaporator 24 to absorb heat and evaporate to a high-temperature refrigerant gas 404, returns to the second compressor 21, and forms a refrigerant cycle in the compression refrigeration unit.
(4) The chilled water supply 501 in the compression refrigeration subsystem is supplied to the third heat exchanger 25, where the air temperature is further reduced, and the chilled water return 502 after heat exchange is returned to the evaporator 24.
(5) After the high-pressure natural gas 101 is depressurized by the first turbo expander 2, the temperature is greatly reduced, and the high-pressure natural gas is heated in the first heat exchanger 5 to raise the temperature, so that medium-pressure high-temperature natural gas 103 is generated to meet the requirement of the inlet temperature of the gas turbine 8, and finally is sent to the combustion chamber 7 of the gas turbine power generation subsystem.
(6) The high-temperature air 201 absorbs the cold energy of the medium-pressure low-temperature natural gas 102 in the first heat exchanger 5 and the third heat exchanger 25, the temperature is reduced, the air enters the second heat exchanger 13, and the formed low-temperature air 202 enters the first compressor 6 of the combustion engine power generation unit.
(7) The low-temperature air 202 is pressurized by a first compressor 6 of the gas turbine power generation unit, then mixed with medium-pressure high-temperature natural gas 103 in a combustion chamber 7 to be combusted to generate high-temperature flue gas, and then enters a gas turbine 8 to drive a second generator 9 to generate power.
The multi-energy coupling power generation system of the gas turbine power station provided by the third embodiment has the following beneficial effects compared with the prior art:
1. the natural gas is regulated through the first turbo expander 1, the effect of natural gas pressure regulation (pressure reduction) can be realized, the pressure energy of the natural gas can be utilized, the first generator 3 is driven through the first turbo expander 1 to generate electricity, and the power output is increased. (utilization of pressure energy)
2. The first heat exchanger 5 and the third heat exchanger 25 are used for heating the depressurized natural gas, and simultaneously cooling the air, so that high-temperature and low-temperature heat exchange is realized.
3. After the natural gas is subjected to heat exchange and temperature rise in the first heat exchanger 5, the requirement of the inlet air temperature of the gas turbine 8 is met by utilizing heat energy, so that an additional heating unit is not needed, and the energy consumption is effectively reduced. (utilization of thermal energy)
4. After the air is cooled in the first heat exchanger 5 and the third heat exchanger 25, the output of the gas turbine 8 can be increased, and meanwhile, because the cooling can be realized without consuming extra energy, the energy (electric power or heating power) consumption can be effectively reduced. (utilization of Cold energy)
5. The second turbo expander 12 is used to drive the second compressor 21 for refrigeration to power the compression refrigeration subsystem, thereby reducing power consumption. (utilization of pressure energy)
As can be seen from the above three embodiments, the invention provides a multi-energy coupling power generation system for a gas turbine power station
1) The natural gas is subjected to pressure regulation through a turbine expander, and a pressure reduction bypass system is arranged;
2) the air is a heat source for the expanded low-temperature natural gas;
3) the air temperature is reduced by using the cold energy of the expanded low-temperature natural gas;
4) the turboexpander can be in one stage or multiple stages, can provide fuel for a gas turbine, and can also enter a gas pipe network to provide natural gas for residents or industries;
5) the power of the compression refrigeration unit comes from the pressure regulating unit, extra power consumption is not needed, meanwhile, the compression refrigeration unit can further reduce the air temperature, and the air temperature is adjustable;
therefore, the coupling utilization of pressure energy, cold energy and heat energy can be realized, and the method has the advantages of high energy utilization rate and good economical efficiency of a power plant.
Of course, in one embodiment, the gas turbine power generation subsystem may further include a waste heat boiler, a steam turbine generator, etc. to form a combined gas-steam cycle, and such a solution is also within the scope of the present invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A multi-energy coupling power generation system of a gas turbine power station is characterized by comprising:
the pressure regulating subsystem comprises a drying device (1), a first turbine expansion machine (2), a first generator (3) and a heat exchange device;
the gas turbine power generation subsystem comprises a first compressor (6), a combustion chamber (7), a gas turbine (8) and a second generator (9);
the inlet end of the drying device (1) is connected with a high-pressure natural gas conveying pipeline, the outlet end of the drying device (1) is connected with the inlet end of the first turbo expander (2), and the outlet end of the first turbo expander (2) is connected with the first generator (3);
the outlet end of the first turboexpander (2) is connected with the natural gas inlet end of the heat exchange device, and the natural gas outlet end of the heat exchange device is connected with the natural gas inlet end of the combustion chamber (7);
high temperature air conveying pipeline is connected to heat transfer device's air inlet end, heat transfer device's air outlet end with the inlet connection of first compressor (6), the exit end of first compressor (6) with the air inlet end of combustion chamber (7) is connected, the exit end of combustion chamber (7) with the inlet connection of gas turbine (8), the exit end of gas turbine (8) with second generator (9) are connected.
2. The gas turbine power plant multi-energy coupling power generation system of claim 1, wherein:
the pressure regulating subsystem further comprises a pressure reducing bypass device (4);
the inlet end of the decompression bypass device (4) is connected with the outlet end of the drying device (1), and the outlet end of the decompression bypass device (4) is connected with the natural gas inlet end of the combustion chamber (7).
3. The gas turbine power plant multi-energy coupling power generation system of claim 1, wherein:
the heat exchange device comprises a first heat exchanger (5);
the natural gas inlet end of the first heat exchanger (5) is connected with the outlet end of the first turbo expander (2), and the natural gas outlet end of the first heat exchanger (5) is connected with the natural gas inlet end of the combustion chamber (7);
the air inlet end of the first heat exchanger (5) is connected with the high-temperature air conveying pipeline, and the air outlet end of the first heat exchanger (5) is connected with the inlet end of the first compressor (6);
the first heat exchanger (5) has a condensate discharge means.
4. The gas turbine power plant multi-energy coupling power generation system of claim 1 or 2, characterized in that:
the multi-energy coupling power generation system of the gas turbine power station further comprises a compression refrigeration subsystem;
the compression refrigeration subsystem comprises a second heat exchanger (13);
the pressure regulating subsystem further comprises a second turbine expansion machine (11), and the combustion engine power generation subsystem further comprises a third generator (12);
the heat exchange device comprises a first heat exchanger (5) and a second heat exchanger (13);
the outlet end of the first turboexpander (2) is connected with the natural gas inlet end of the first heat exchanger (5), the natural gas outlet end of the first heat exchanger (5) is connected with the natural gas inlet end of the combustion chamber (7), the air inlet end of the first heat exchanger (5) is connected with the high-temperature air conveying pipeline, the air outlet end of the first heat exchanger (5) is connected with the air inlet end of the second heat exchanger (13), and the air outlet end of the second heat exchanger (13) is connected with the air inlet end of the first compressor (6);
the inlet end of the second turbine expansion machine (11) is connected with the outlet end of the first turbine expansion machine (2), the outlet end of the second turbine expansion machine (11) is respectively connected with the natural gas inlet ends of the third power generator (12) and the second heat exchanger (13), and the natural gas outlet end of the second heat exchanger (13) is connected with a low-pressure gas pipe network.
5. The gas turbine power plant multi-energy coupling power generation system of claim 1 or 2, characterized in that:
the multi-energy coupling power generation system of the gas turbine power station further comprises a compression refrigeration subsystem;
the compression refrigeration subsystem comprises a second compressor (21), a condenser (22), a throttling device (23) and an evaporator (24);
the heat exchange device comprises a first heat exchanger (5) and a third heat exchanger (25);
the second compressor (22) is arranged on a connecting pipeline between the outlet end of the first turbo expander (2) and the first generator (3), the inlet end of the second compressor (21) is respectively connected with the outlet end of the first turbo expander (2) and the natural gas outlet end of the evaporator (24), the outlet end of the second compressor (21) is respectively connected with the first generator (3) and the condenser (22), and the condenser (22) is connected to the natural gas inlet end of the evaporator (24) through the throttling device (23);
the chilled water output end of the evaporator (24) is connected with the fluid inlet end of the third heat exchanger (25), and the fluid outlet end of the third heat exchanger (25) is connected with the chilled water return end of the evaporator (24);
the outlet end of the first turboexpander (2) is connected with the natural gas inlet end of the first heat exchanger (5), and the natural gas outlet end of the first heat exchanger (5) is connected with the natural gas inlet end of the combustion chamber (7); the air inlet end of the first heat exchanger (5) is connected with the high-temperature air conveying pipeline, the air outlet end of the first heat exchanger (5) is connected with the air inlet end of the third heat exchanger (25), and the air outlet end of the third heat exchanger (25) is connected with the inlet end of the first compressor (6).
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