CN219034830U - ORC-TEG combined cooling heating and power system based on LNG cold energy utilization - Google Patents

ORC-TEG combined cooling heating and power system based on LNG cold energy utilization Download PDF

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CN219034830U
CN219034830U CN202223227779.XU CN202223227779U CN219034830U CN 219034830 U CN219034830 U CN 219034830U CN 202223227779 U CN202223227779 U CN 202223227779U CN 219034830 U CN219034830 U CN 219034830U
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orc
lng
heat
expander
pump body
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纪冬旭
张帆
尹文斌
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Chinese University of Hong Kong Shenzhen
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Chinese University of Hong Kong Shenzhen
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Abstract

An ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization belongs to the technical field of geothermal energy and liquefied natural gas cold energy recycling. The utility model solves the problems of the prior art that the geothermal energy and LNG cold energy are not fully utilized and the fire loss is large due to the large temperature difference between the geothermal energy and the LNG. The heat source heat exchanger, the first expander, the first evaporator and the first pump body are connected through pipelines in sequence to form a primary ORC circulating system; the heat source heat exchanger, the second expander, the second evaporator and the second pump body are connected through pipelines in sequence to form a secondary ORC circulating system; LNG storage tank, third pump body, first evaporimeter, fourth pump body, second evaporimeter, third expander and air cooler pass through the pipe connection in proper order and form LNG conveying system. The multistage compression is adopted, so that the temperature difference between the refrigerant and the LNG is reduced, and the fire efficiency of the system is improved.

Description

ORC-TEG combined cooling heating and power system based on LNG cold energy utilization
Technical Field
The utility model relates to an ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization, and belongs to the technical field of geothermal energy and liquefied natural gas cold energy recycling.
Background
With the increase of environmental protection consciousness and the shortage of traditional energy sources, people are urgent to fully develop and excavate new energy sources. The abundant heat exists underground to supply electricity and heat for people. Also Liquefied Natural Gas (LNG) has a lot of cold energy due to the low temperature as-162 ℃. However, the use of LNG cold energy is now relatively rough. If a large temperature difference between geothermal heat and LNG of up to 260 c or more is used for power generation, very high efficiency will be obtained. Therefore, the cold energy of the LNG is provided to the ORC, so that the utilization efficiency of the geothermal heat can be improved, and the LNG preheating process can be realized.
At present, cold energy utilization of LNG is generally carried out by using an expander only, and the technology is limited by small temperature difference and has low efficiency. In contrast, ORC (organic rankine cycle) is generally used for power generation for combined use of geothermal heat and LNG, and thermal energy and cold energy are not fully utilized and a large temperature difference between geothermal heat and LNG causes a huge fire loss.
Disclosure of Invention
The utility model aims to solve the problems of large fire loss caused by insufficient utilization of the existing geothermal energy and LNG cold energy and large temperature difference between geothermal energy and LNG, and further provides an ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization, including geothermal well, heat source heat exchanger, heat supply heat exchanger, first to third expander, first evaporimeter, second evaporimeter, LNG storage tank, air cooler and first to fourth pump body, wherein:
the geothermal well and the heat source heat exchanger are respectively connected through pipelines to form a geothermal system;
the heat source heat exchanger, the first expander, the first evaporator and the first pump body are connected through pipelines in sequence to form a primary ORC circulating system;
the heat source heat exchanger, the second expander, the second evaporator and the second pump body are connected through pipelines in sequence to form a secondary ORC circulating system;
the LNG storage tank, the third pump body, the first evaporator, the fourth pump body, the second evaporator, the third expander and the air cooler are sequentially connected through pipelines to form an LNG conveying system;
the heat supply heat exchanger is connected with a heat supply terminal through a pipeline to supply heat;
the first expander, the second expander and the third expander are respectively connected to the power supply terminal through circuits to supply power;
the natural gas outlet of the air cooler is connected to the gas supply terminal through a pipeline for natural gas supply;
the air outlet of the air cooler is connected to the cooling terminal through a pipeline for cooling.
Further, a first TEG module is disposed on the pipeline between the third pump body and the first evaporator.
Further, a second TEG module is disposed on the pipeline between the fourth pump body and the second evaporator.
Further, the refrigerant saturation temperature in the secondary ORC cycle is higher than the refrigerant saturation temperature in the primary ORC cycle;
further, the medium in the heat supply heat exchanger for exchanging heat with geothermal water is air or water.
Compared with the prior art, the utility model has the following effects:
the application adopts multistage compression, reduces the difference in temperature between refrigerant and the LNG, improves the fire efficiency of system.
The geothermal energy cascade utilization system is formed by adopting two-stage ORC and three-stage power generation in a series-parallel connection mode, LNG cold energy and geothermal heat energy can be better utilized by the geothermal energy cascade utilization system, the loss of fire caused by huge temperature difference between the LNG cold energy and the geothermal heat energy is reduced, and the fire utilization efficiency is improved. The use of a two-stage ORC cycle can effectively split the large temperature differential between geothermal heat and LNG into two smaller temperature differentials, thereby reducing the fire loss of the system. Meanwhile, the LNG side uses two-stage compression, so that on one hand, the efficiency of the pump can be improved, the power consumption of the pump is reduced, and on the other hand, the temperature difference between LNG and ORC working media can be effectively controlled, and the fire efficiency is further improved.
Drawings
FIG. 1 is a block diagram of an ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization.
Detailed Description
The first embodiment is as follows: referring to fig. 1, an ORC-TEG combined cooling and heating system based on LNG cold energy utilization is described, and includes a geothermal well 1, a heat source heat exchanger 2, a heat supply heat exchanger 3, first to third expansion machines, a first evaporator 7, a second evaporator 8, an LNG storage tank 9, an air cooler 10, and first to fourth pump bodies, wherein:
the geothermal well 1 and the heat source heat exchanger 2 are respectively connected through pipelines to form a geothermal system;
the heat source heat exchanger 2, the first expander 4, the first evaporator 7 and the first pump body 11 are sequentially connected through pipelines to form a primary ORC circulating system;
the heat source heat exchanger 2, the second expander 5, the second evaporator 8 and the second pump body 12 are sequentially connected through pipelines to form a secondary ORC circulating system;
the LNG storage tank 9, the third pump body 13, the first evaporator 7, the fourth pump body 14, the second evaporator 8, the third expander 6 and the air cooler 10 are sequentially connected through pipelines to form an LNG conveying system;
the heat supply heat exchanger 3 supplies heat to the heat supply terminal through pipeline connection;
the first expander 4, the second expander 5 and the third expander 6 are respectively connected to a power supply terminal through circuits to supply power;
the natural gas outlet of the air cooler 10 is connected to a gas supply terminal through a pipeline for natural gas supply;
the air outlet of the air cooler 10 is connected to a cooling terminal through a pipe for cooling.
The heating terminal, the power supply terminal, the cooling terminal and the air supply terminal described in the application can be the same or different buildings or any other devices with the requirements of heating, power supply, cooling or air supply.
The geothermal system provides heat sources for other systems, water is used as working medium in the geothermal system, after the water absorbs heat fully underground through the geothermal well 1, the water flows to the heat source heat exchanger 2 and the heat supply heat exchanger 3 respectively, and after the water exchanges heat fully, the water flows back to the underground to form a circulation loop.
The air or water is heat-exchanged with the hot water flowing from the geothermal well 1 in the heat-supplying heat exchanger 3, and then enters the heat-supplying terminal for supplying heat. The heating terminal can be a building such as a residential building.
The LNG in the LNG storage tank 9 is subjected to pressure rise after passing through the third pump body 13, enters the first evaporator 7 for evaporation and heat absorption, is compressed by the fourth pump body 14, enters the second evaporator 8 for evaporation and heat absorption at a higher saturation temperature, is subjected to expansion and depressurization to a required pressure by the third expander 6, and finally enters the air cooler 10 for heat exchange with air, and is fed into terminals such as residential buildings for natural gas supply;
in the process of supplying natural gas, the third expander 6 is utilized to generate electric energy again, so that power supply to power supply terminals such as residential buildings is realized;
the air reaches very low temperature after heat exchange and temperature reduction with the low-temperature LNG in the air cooler 10, and is connected to a cooling terminal of a residential building and the like through a pipeline to cool;
both the primary ORC cycle and the secondary ORC cycle obtain geothermal heat from the heat source heat exchanger 2. After leaving the heat source heat exchanger 2, the refrigerant respectively passes through the first expander 4 and the second expander 5 to do work, then correspondingly enters the first condenser and the second condenser, is correspondingly pressurized through the first pump body 11 and the second pump body 12, and flows back into the heat source heat exchanger 2 again.
The electric energy generated after the first expander 4 and the second expander 5 do work respectively is respectively transmitted to power supply terminals such as residential buildings for power supply.
The application adopts multistage compression, reduces the difference in temperature between refrigerant and the LNG, improves the fire efficiency of system.
The geothermal energy cascade utilization system is formed by adopting two-stage ORC and three-stage power generation in a series-parallel connection mode, LNG cold energy and geothermal heat energy can be better utilized by the geothermal energy cascade utilization system, the loss of fire caused by huge temperature difference between the LNG cold energy and the geothermal heat energy is reduced, and the fire utilization efficiency is improved. The use of a two-stage ORC cycle can effectively split the large temperature differential between geothermal heat and LNG into two smaller temperature differentials, thereby reducing the fire loss of the system. Meanwhile, the LNG side uses two-stage compression, so that on one hand, the efficiency of the pump can be improved, the power consumption of the pump is reduced, and on the other hand, the temperature difference between LNG and ORC working media can be effectively controlled, and the fire efficiency is further improved.
A first TEG module 15 is provided on the line between the third pump body 13 and the first evaporator 7. The TEG module is a thermoelectric generation module, such as a thermoelectric generation sheet. In the process of supplying natural gas, power is generated by the first TEG module 15 through utilizing the temperature difference between LNG and air, so that power supply to power supply terminals such as residential buildings is realized. Meanwhile, the LNG cold energy is recovered by using the TEG, so that the energy utilization efficiency is improved. The first TEG module 15 and the third expander 6 are able to utilize the cold energy of the LNG before it enters the first evaporator 7 and between the second evaporator 8 and the air cooler 10, respectively, which is not normally available in the prior art.
A second TEG module 16 is provided on the line between the fourth pump body 14 and the second evaporator 8. In the process of supplying natural gas, the first TEG module 15 and the second TEG module 16 are used for generating power by utilizing the temperature difference between the LNG and the air in stages, and the third expander 6 is used for generating electric energy again, so that power supply to power supply terminals such as residential buildings is realized. The first TEG module 15, the second TEG module 16, and the third expander 6 are capable of utilizing cold energy of LNG before entering the first evaporator 7, between the first evaporator 7 and the second evaporator 8, and between the second evaporator 8 and the air cooler 10, respectively, which is not generally available in the prior art.
The refrigerant saturation temperature in the secondary ORC cycle system is higher than the refrigerant saturation temperature in the primary ORC cycle system; the refrigerant of the primary ORC cycle has a very low saturation temperature at normal pressure, and the refrigerant of the secondary ORC cycle has a higher saturation temperature than the primary ORC cycle.
The medium in the heat supply heat exchanger 3 for exchanging heat with geothermal water is air or water. By the design, water or air exchanges heat with high-temperature water from a geothermal system in the heat supply heat exchanger 3, and enters the heat supply terminals such as buildings after reaching the temperature required by the heat supply terminals such as the buildings, and the heat is supplied to the heat supply terminals.
In the combined cooling, heating and power generation method adopting the combined cooling, heating and power generation system, water flows to the heat source heat exchanger 2 and the heat supply heat exchanger 3 respectively after being fully absorbed in the ground through the geothermal well 1, and flows back to the ground after being fully exchanged to form a circulation loop;
the heat supply medium exchanges heat with water from the geothermal system in the heat supply heat exchanger 3, and enters a heat supply terminal to supply heat after reaching the heat supply temperature;
in the primary ORC circulating system, the refrigerant absorbs heat from the heat source heat exchanger 2, then works and generates power through the first expander 4, the temperature and the pressure of the refrigerant are reduced after expansion, the refrigerant enters the first evaporator 7 to exchange heat with LNG in a condensing mode, and the refrigerant is pressurized by the first pump body 11 and returns to the heat source heat exchanger 2 again to be heated and evaporated; the refrigerant absorbs heat from the heat source heat exchanger 2 to reach a high-temperature and high-pressure state.
In the secondary ORC circulation system, the refrigerant with the normal pressure saturation temperature higher than that of the primary ORC circulation system absorbs heat from the heat source heat exchanger 2, then works and generates power through the second expander 5, the refrigerant is condensed and exchanges heat with LNG in the second evaporator 8 at the condensation temperature higher than that in the primary ORC circulation system, and the condensed refrigerant is pressurized by the second pump body 12 to the heat source heat exchanger 2 for heating and evaporation;
in the LNG conveying system, LNG is pumped out of an LNG storage tank 9 by a third pump body 13, enters a first evaporator 7 to exchange heat with a refrigerant, the temperature of the LNG rises, the energy content of the LNG increases after passing through a fourth pump body 14, enters a second evaporator 8 to exchange heat with the refrigerant again to raise the temperature, then the LNG is expanded by a third expander 6 to generate power, the pressure is reduced to the pressure required by a terminal, and the pressure reaches normal temperature after passing through an air cooler 10 to exchange heat with air, so that natural gas is supplied; by providing the first TEG module 15 on the line between the third pump body 13 and the first evaporator 7, the LNG in the line can be heated to 10 degrees lower than the condensation temperature of the refrigerant in the first evaporator 7.
The air exchanges heat with LNG in the air cooler 10 to form cold air, which is cooled.

Claims (5)

1. ORC-TEG combined cooling, heating and power system based on LNG cold energy utilization, its characterized in that: including geothermal well (1), heat source heat exchanger (2), heat supply heat exchanger (3), first through third expander, first evaporimeter (7), second evaporimeter (8), LNG storage tank (9), air cooler (10) and first through fourth pump body, wherein:
the geothermal well (1) and the heat source heat exchanger (2) and the geothermal well (1) and the heat supply heat exchanger (3) are respectively connected through pipelines to form a geothermal system;
the heat source heat exchanger (2), the first expander (4), the first evaporator (7) and the first pump body (11) are sequentially connected through pipelines to form a primary ORC circulating system;
the heat source heat exchanger (2), the second expander (5), the second evaporator (8) and the second pump body (12) are connected through pipelines in sequence to form a secondary ORC circulating system;
the LNG storage tank (9), the third pump body (13), the first evaporator (7), the fourth pump body (14), the second evaporator (8), the third expander (6) and the air cooler (10) are sequentially connected through pipelines to form an LNG conveying system;
the heat supply heat exchanger (3) is connected through a pipeline to supply heat to the heat supply terminal;
the first expander (4), the second expander (5) and the third expander (6) are respectively connected to a power supply terminal through circuits to supply power;
the natural gas outlet of the air cooler (10) is connected to the gas supply terminal through a pipeline for natural gas supply;
an air outlet of the air cooler (10) is connected to a cooling terminal through a pipeline for cooling.
2. The ORC-TEG cogeneration system of claim 1, wherein: a first TEG module (15) is arranged on a pipeline between the third pump body (13) and the first evaporator (7).
3. The ORC-TEG cogeneration system of claim 2, wherein: a second TEG module (16) is arranged on a pipeline between the fourth pump body (14) and the second evaporator (8).
4. The ORC-TEG cogeneration system of claim 1, 2, or 3, wherein: the refrigerant saturation temperature in the secondary ORC cycle is higher than the refrigerant saturation temperature in the primary ORC cycle.
5. The ORC-TEG cogeneration system of claim 1, 2, or 3, wherein: the medium in the heat supply heat exchanger (3) for exchanging heat with geothermal water is air or water.
CN202223227779.XU 2022-12-01 2022-12-01 ORC-TEG combined cooling heating and power system based on LNG cold energy utilization Active CN219034830U (en)

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