CN217636252U - Vapor compression absorption type Rankine cycle device - Google Patents
Vapor compression absorption type Rankine cycle device Download PDFInfo
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- CN217636252U CN217636252U CN202221286683.8U CN202221286683U CN217636252U CN 217636252 U CN217636252 U CN 217636252U CN 202221286683 U CN202221286683 U CN 202221286683U CN 217636252 U CN217636252 U CN 217636252U
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Abstract
The utility model discloses a vapor compression absorption type Rankine cycle device, which comprises a vapor Rankine cycle, a lithium bromide heat pump unit and a vapor compression system, wherein a vapor outlet of a boiler is communicated with an inlet port of a steam turbine, and high-temperature and high-pressure vapor discharged from a vapor outlet of the boiler enters the steam turbine to do work; steam discharged from a backpressure outlet of the steam turbine enters a lithium bromide heat pump unit and is used as a high-temperature heat source of the lithium bromide heat pump unit; hot water discharged from the absorption side of the lithium bromide heat pump unit enters a flash tank for flash evaporation; the steam discharge end of the flash tank is communicated with the inlet end of the steam compressor, the discharge end of the steam compressor is communicated with the boiler, and steam discharged by the steam compressor is reheated by the boiler and enters the steam turbine to do work. The system improves the pressure and the temperature of steam at the inlet of the steam compressor through the lithium bromide unit, reduces the compression ratio of the steam compressor, reduces the condensation heat loss of the steam Rankine cycle, and increases the comprehensive efficiency of the system.
Description
Technical Field
The utility model relates to a vapor compression absorption formula rankine cycle device.
Background
The power plant utilizes a boiler and a generator to convert fossil energy into electric energy for human life and production. The steam power cycle of the thermal power plant can be simplified into four main devices of a feed pump, a boiler, a steam turbine, a condenser and the like. The water is compressed and pressurized in the water pump, then enters the boiler to be heated and vaporized until becoming superheated steam, then enters the steam turbine to expand and work, the low-pressure steam after working enters the condenser to be cooled and condensed into water and then returns to the water supply pump, and the operation is repeated in a circulating way. In a traditional steam cycle, the heat released by a condenser occupies a large proportion, so that the comprehensive efficiency of the system is low.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a vapor compression absorption type rankine cycle device with good overall efficiency.
Realize the technical scheme of the utility model as follows
The vapor compression absorption type Rankine cycle device comprises a vapor Rankine cycle, a lithium bromide heat pump unit and a vapor compression system, wherein the vapor Rankine cycle comprises a boiler, a steam turbine and a generator; the vapor compression system comprises a flash tank and a vapor compressor;
the steam outlet of the boiler is communicated with the inlet of the steam turbine, and high-temperature and high-pressure steam discharged from the steam outlet of the boiler enters the steam turbine to do work to drive the generator to generate electricity; steam discharged from a back pressure outlet of the steam turbine enters the lithium bromide heat pump unit and is used as a high-temperature heat source of the lithium bromide heat pump unit;
a hot water discharge end at an absorption side in the lithium bromide heat pump unit is communicated with the flash tank, and hot water discharged from the absorption side of the lithium bromide heat pump unit enters the flash tank to be flashed; the steam discharge end of the flash tank is communicated with the inlet end of the steam compressor, the discharge end of the steam compressor is communicated with the boiler, and steam discharged by the steam compressor is reheated by the boiler and enters the steam turbine to do work.
The lithium bromide heat pump unit comprises an evaporator, an absorber, a generator and a condenser, wherein the evaporator, the absorber, the generator and the condenser are respectively internally provided with a heat exchange pipe;
the steam compressor is a steam compressor with a spraying structure;
the heat exchange tube in the evaporator, the heat exchange tube in the generator and the water spraying structure of the steam compressor are communicated, and condensed water discharged from the heat exchange tube in the evaporator and the condensed water discharged from the heat exchange tube in the generator enter the spraying structure of the steam compressor for spraying.
The heat exchange tubes in the evaporator and the generator are communicated with the boiler, and condensed water discharged from the heat exchange tubes in the evaporator and the condensed water discharged from the heat exchange tubes in the generator enter the boiler.
The water discharge end of the flash tank is communicated with the water inlet end of a heat exchange tube in an absorber of the lithium bromide heat pump unit, and the hot water discharge end of the heat exchange tube in the absorber is communicated with the water return end of the flash tank;
the heat exchange tube in the evaporator, the heat exchange tube in the generator and the water inlet end of the heat exchange tube in the absorber are communicated, and condensed water discharged from the heat exchange tube in the evaporator and the condensed water discharged from the heat exchange tube in the generator enter the heat exchange tube in the absorber.
The steam discharge end of the generator is communicated with the interior of the condenser, one end of a heat exchange tube in the condenser is a low-temperature water inlet end, the other end of the heat exchange tube in the condenser is a high-temperature water outlet end, steam entering the condenser exchanges heat with water in the heat exchange tube in the condenser, the steam is condensed to form a liquid state, and the liquid state enters the evaporator to be sprayed.
A heat exchanger is arranged between the generator and the absorber, and liquid in the generator enters the absorber to be sprayed through the primary side of the heat exchanger; the liquid in the absorber passes through the secondary side of the heat exchanger and enters the generator for spraying.
By adopting the technical scheme, on the basis of the original steam circulation, the second lithium bromide heat pump system and the steam compression system are added, back pressure steam at the outlet of the steam turbine is taken as a high-temperature heat source of the lithium bromide unit, water is heated by the absorber side in the lithium bromide heat pump and enters the flash tank for flash evaporation, the steam which is flashed out enters the steam compressor for compression, and the steam enters the steam turbine for doing work after being heated by the boiler. The system improves the pressure and the temperature of steam at the inlet of the steam compressor through the lithium bromide unit, reduces the compression ratio of the steam compressor, reduces the condensation heat loss of the steam Rankine cycle, and increases the comprehensive efficiency of the system.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of a lithium bromide heat pump unit according to the present invention;
in the drawing, 100 is a boiler, 101 is a steam turbine, 102 is a generator, 103 is a flash tank, 104 is a steam compressor, 105 is a heat exchange pipe, 106 is an evaporator, 107 is an absorber, 108 is a generator, 109 is a condenser, 110 is a first pipe, 111 is a second pipe, 112 is a third pipe, 113 is a fourth pipe, 114 is a fifth pipe, 115 is a sixth pipe, 116 is a seventh pipe, 117 is an eighth pipe, 118 is a ninth pipe, 119 is a heat exchanger, and 120 is a water pump.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 and 2, the vapor compression absorption rankine cycle device includes a vapor rankine cycle, a lithium bromide heat pump unit and a vapor compression system, which are operated in a combined manner, wherein the vapor rankine cycle includes a boiler 100, a steam turbine 101 and a generator 102; the vapor compression system comprises a flash tank 103 and a vapor compressor 104; the lithium bromide heat pump unit comprises an evaporator 106, an absorber 107, a generator 108 and a condenser 109, wherein the heat exchange tubes 105 are respectively arranged in the evaporator.
In the application, a steam outlet of the boiler 100 is communicated with an inlet of the steam turbine 101 through a first pipeline 110, and high-temperature and high-pressure steam discharged from the steam outlet of the boiler 100 enters the steam turbine 101 through the first pipeline 110 to do work, so as to drive the generator 102 to generate electricity; the back pressure outlet discharge end of the steam turbine 101 is respectively communicated with the generator 108 in the lithium bromide heat pump unit and the inlet end of the heat exchange tube 105 in the evaporator 106 through a second pipeline 111; steam discharged from the back pressure outlet of the steam turbine 101 enters a heat exchange pipe 105 in a lithium bromide heat pump unit generator 108 and an evaporator 106 to be used as a high-temperature heat source of the lithium bromide heat pump unit.
In the application, a hot water discharge end of an absorber 107 in the lithium bromide heat pump unit is communicated with the flash tank 103 through a third pipeline 112, so that hot water discharged from the absorber 107 of the lithium bromide heat pump unit enters the flash tank 103 to be flashed; the steam discharge end of the flash tank 103 is communicated with the inlet end of the steam compressor 104 through a fourth pipeline 113, the steam discharged from the flash tank 103 enters the steam compressor 104 through the fourth pipeline 113 and is compressed by the steam compressor 104, the discharge end of the steam compressor 104 is communicated with the boiler 100 through a fifth pipeline 114, and the steam discharged from the steam compressor 104 enters the steam turbine 101 for doing work after being reheated by the boiler 100.
In this application, the vapor compressor 104 is a vapor compressor with a spray structure; the heat exchange tube 105 in the evaporator 106 and the heat exchange tube in the generator 108 are communicated with the water spraying structure of the vapor compressor 104 through a sixth pipeline 115, and condensed water discharged from the heat exchange tube in the evaporator 106 and the condensed water discharged from the heat exchange tube in the generator 108 enter the spraying structure of the vapor compressor 104 through the sixth pipeline 115 to be sprayed, mixed with vapor in the compressor, and cooled, so that the vapor discharged from the vapor compressor 104 is close to saturated vapor.
In the present application, the heat exchange tube in the evaporator 106 and the heat exchange tube in the generator 108 are further communicated with the boiler 100 through a seventh pipeline 116, a water pump 120 is installed on the seventh pipeline, and the condensed water discharged from the heat exchange tube in the evaporator 106 and the condensed water discharged from the heat exchange tube in the generator 108 are introduced into the boiler 100 through the water pump for recycling. The water discharging end of the flash tank 103 is communicated with the water inlet end of the heat exchange tube in the lithium bromide heat pump unit absorber 107 through an eighth pipeline 117, water in the flash tank 103 flows back to the heat exchange tube in the absorber 107 through the eighth pipeline, and after heat exchange in the heat exchange tube, the water enters the flash tank 103 through a third pipeline 112 for flash evaporation, and the circulation is performed.
In the present application, the discharge end of the heat exchange tube in the evaporator 106, the discharge end of the heat exchange tube in the generator 108 and the water inlet end of the heat exchange tube in the absorber 107 are communicated through a ninth pipeline 118, and the condensed water discharged from the heat exchange tube in the evaporator 106, the condensed water discharged from the heat exchange tube in the generator 108 and the water returning from the flash tank 103 are mixed and enter the heat exchange tube in the absorber 107 for use.
The steam discharge end at the top of the generator 108 is communicated with the inside of the condenser 109 through a pipeline, steam generated in the generator 108 enters the condenser 109 through the pipeline, one end of a heat exchange pipe in the condenser 109 is a low-temperature water inlet end, the other end of the heat exchange pipe is a high-temperature water outlet end, the steam entering the condenser 109 exchanges heat with water in the heat exchange pipe in the condenser 109, the steam is condensed to form a liquid state and enters the evaporator 106 to be sprayed, and the water in the heat exchange pipe in the condenser 109 is discharged for use after rising.
A heat exchanger 119 is arranged between the generator 108 and the absorber 107, and liquid in the generator 108 enters the absorber 107 to be sprayed through the primary side of the heat exchanger; the liquid in the absorber 107 passes through the secondary side of the heat exchanger and enters the generator 108 for spraying, and the heat energy in the system is utilized through the heat exchanger.
The working process of the application is as follows: steam at the back pressure outlet of the steam Rankine cycle turbine 101 respectively enters a generator 108 and an evaporator 106 of a lithium bromide unit, one path of the condensed and mixed steam is mixed with water at the inlet side of an absorber 107 of the lithium bromide unit, the other path of the condensed and mixed steam is sprayed and cooled by a steam compressor 104, and the rest steam is pumped back to the boiler 100 by a water pump; the absorber 107 side in the lithium bromide heat pump unit is the hot water heating process, and the condenser 109 side is the higher grade hot water, which supplies heat to the outside.
In the steam compression circulation system, hot water from a lithium bromide unit absorber 107 enters a flash tank 103, generated steam enters a steam compressor 104 for compression, meanwhile, condensed water from a lithium bromide generator and an evaporator 106 is used as interstage spray cooling of the steam compressor 104, steam at the outlet of the steam compressor 104 is reheated by a boiler 100 and then enters a steam turbine 101 for work.
In the steam Rankine cycle, high-temperature and high-pressure steam discharged from the outlet of the boiler 100 enters a steam turbine 101 to do work for power generation, the steam discharged from back pressure enters a generator and an evaporator 106 of a lithium bromide unit respectively, a part of the steam is condensed and then enters a steam compression cycle, and the rest of the steam is pumped back to the boiler 100 through a water pump.
The lithium bromide heat pump is a second type heat pump, steam discharged by back pressure enters a generator and an evaporator 106 of a lithium bromide unit respectively for condensation and heat release, and condensed water and water at the outlet of the flash tank 103 are mixed and enter an absorber 107 of the lithium bromide unit for heating and then return to the flash tank 103.
Steam flashed out from the flash tank 103 enters a steam compressor 104 for compression, meanwhile, the steam exhaust condensate part of the steam turbine 101 enters the steam compressor 104 for interstage spray cooling, the steam pressure at the outlet of the steam compressor 104 is the same as the steam pressure at the inlet of the original steam turbine 101, and then enters the boiler 100 for reheating to the steam temperature at the inlet of the original steam turbine 101.
The operation efficiency of the system of the application is fully explained by the operation data of the system as follows:
for convenient calculation, taking the mass flow of steam at the inlet of the steam turbine as 1kg/s; steam turbine cylinder efficiency 0.85; compressor efficiency 0.8; the water pump efficiency is 0.8.
The inlet steam parameter of the steam turbine is 9.8MPa,525 ℃ and the enthalpy h =3441.22kj/kg; the outlet back pressure parameter was 0.294mpa,133 ℃, enthalpy h =2725.9kj/kg. Turbine work = (3441.22-2725.9) = 1=715.3kw;
the backpressure steam enters a generator and an evaporator of a lithium bromide heat pump system, hot water with the temperature of 190 ℃ is discharged from an absorber side, and the backpressure steam is sent to a flash tank to evaporate saturated steam (1.0 MPa) with the temperature of 180 ℃ and the pressure of 0.5 kg/s.
0.5kg/s of 180 ℃ and 1.0MPa steam enters a steam compressor for compression, the steam compressor is used for 4-stage compression, the middle 3-stage water injection is used for cooling, the water injection quantity is calculated to be 0.1kg/s (133 ℃), and the power consumption of the steam compressor is calculated to be 329.2kw. Boiler 100 steam reheat =454.39 × 0.6=272.64kw, condensate return heat requirement =2870.18 × 0.4=1148.07kw.
Water pump power consumption =11.8 × 0.4=4.72kw
Vapor compression system electrical generation efficiency = (715.3 x 0.6-329.2)/272.64 =36.7%
Original Rankine cycle system power generation efficiency = (715.3 x 0.4)/(1148.07 + 4.72) =24.8%
System total power generation efficiency = (715.3-329.2)/(272.64 +1148.07+ 4.72) =27%
Therefore, the power generation efficiency of the original system can be greatly increased by adding the steam compression system.
Claims (6)
1. The vapor compression absorption type Rankine cycle device comprises a vapor Rankine cycle, a lithium bromide heat pump unit and a vapor compression system, and is characterized in that the vapor Rankine cycle comprises a boiler, a steam turbine and a generator; the vapor compression system comprises a flash tank and a vapor compressor;
the steam outlet of the boiler is communicated with the inlet of the steam turbine, and high-temperature and high-pressure steam discharged from the steam outlet of the boiler enters the steam turbine to do work to drive the generator to generate electricity; steam discharged from a backpressure outlet of the steam turbine enters a lithium bromide heat pump unit and is used as a high-temperature heat source of the lithium bromide heat pump unit;
the hot water discharge end of the absorption side in the lithium bromide heat pump unit is communicated with the flash tank, and the hot water discharged from the absorption side of the lithium bromide heat pump unit enters the flash tank to be flashed; the steam discharge end of the flash tank is communicated with the inlet end of the steam compressor, the discharge end of the steam compressor is communicated with the boiler, and steam discharged by the steam compressor is reheated by the boiler and enters the steam turbine to do work.
2. The vapor compression absorption Rankine cycle device according to claim 1, wherein the lithium bromide heat pump unit comprises an evaporator, an absorber, a generator and a condenser, wherein heat exchange tubes are respectively arranged in the evaporator, and a back pressure outlet of a steam turbine is respectively communicated with the heat exchange tubes in the evaporator and the heat exchange tubes in the generator;
the steam compressor is a steam compressor with a spraying structure;
the heat exchange tube in the evaporator, the heat exchange tube in the generator and the water spraying structure of the steam compressor are communicated, and condensed water discharged from the heat exchange tube in the evaporator and the condensed water discharged from the heat exchange tube in the generator enter the spraying structure of the steam compressor for spraying.
3. The vapor compression absorption Rankine cycle device according to claim 1, wherein the heat exchange tubes in the evaporator and the heat exchange tubes in the generator are further communicated with a boiler, and condensed water discharged from the heat exchange tubes in the evaporator and condensed water discharged from the heat exchange tubes in the generator enter the boiler.
4. The vapor compression absorption Rankine cycle device according to claim 2 or 3, wherein a water discharge end of the flash tank is communicated with a water inlet end of a heat exchange tube in an absorber of the lithium bromide heat pump unit, and a hot water discharge end of the heat exchange tube in the absorber is communicated with a water return end of the flash tank;
the heat exchange tube in the evaporator, the heat exchange tube in the generator and the water inlet end of the heat exchange tube in the absorber are communicated, and condensed water discharged from the heat exchange tube in the evaporator and the condensed water discharged from the heat exchange tube in the generator enter the heat exchange tube in the absorber.
5. The vapor compression absorption Rankine cycle device according to claim 2 or 3, wherein a vapor discharge end of the generator is communicated with the interior of the condenser, one end of a heat exchange pipe in the condenser is a low-temperature water inlet end, the other end of the heat exchange pipe is a high-temperature water outlet end, vapor entering the condenser exchanges heat with water in the heat exchange pipe in the condenser, is condensed to form a liquid, and enters the evaporator for spraying.
6. The vapor compression absorption Rankine cycle device according to claim 2 or 3, wherein a heat exchanger is provided between the generator and the absorber, and liquid in the generator passes through a primary side of the heat exchanger and enters the absorber to be sprayed; the liquid in the absorber passes through the secondary side of the heat exchanger and enters the generator for spraying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221286683.8U CN217636252U (en) | 2022-05-27 | 2022-05-27 | Vapor compression absorption type Rankine cycle device |
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| CN202221286683.8U CN217636252U (en) | 2022-05-27 | 2022-05-27 | Vapor compression absorption type Rankine cycle device |
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