Carbon dioxide liquefaction system

Abstract

To provide a carbon dioxide liquefaction system that efficiently liquefies a carbon dioxide gas when running energy management in a district.SOLUTION: A carbon dioxide liquefaction system includes: a heat supply system for supplying heat for cooling or heating to a plurality of buildings; a carbon dioxide recovery device for recovering a carbon dioxide gas; and a carbon dioxide liquefaction device for liquefying the carbon dioxide gas that is recovered by the carbon dioxide recovery device. The carbon dioxide liquefaction device includes a heat exchanger for performing heat exchange using a refrigerant that is used by the heat supply system.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide liquefaction system. [Background technology]

[0002] Patent Document 1 describes a method for regenerating used carbon dioxide gas, which includes a distillation step in which used carbon dioxide gas exhausted from a carbon dioxide gas scrubbing means is introduced into a distillation column and rectified to remove impurities contained in the used carbon dioxide gas, and a re-liquefaction step in which high-purity vaporized carbon dioxide gas extracted from the distillation column is introduced into a condenser and liquefied, and the regenerated carbon dioxide gas after this re-liquefaction is reused for cleaning in the carbon dioxide gas scrubbing means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-20885 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to manage energy efficiently, there is a local energy management system that manages energy for the entire city, rather than just for individual buildings or houses. Furthermore, in order to reduce carbon dioxide emissions from this region, attempts are being made to capture and reuse the carbon dioxide gas generated in the region. The captured carbon dioxide gas can be liquefied and stored in carbon dioxide gas cylinders, for example, but energy is required to liquefy the carbon dioxide gas. An object of the present invention is to provide a carbon dioxide liquefaction system that efficiently liquefies carbon dioxide gas when performing energy management in a region. [Means for solving the problem]

[0005] A carbon dioxide liquefaction system to which the present invention is applicable comprises a heat supply system that supplies heat for cooling or heating to a plurality of buildings, a carbon dioxide capture device that captures carbon dioxide gas, and a carbon dioxide liquefaction device that liquefies the carbon dioxide gas captured by the carbon dioxide capture device, wherein the carbon dioxide liquefaction system comprises a heat exchanger that performs heat exchange using a refrigerant used in the heat supply system. Here, the heat supply system may be characterized in that it supplies heat using a heating tower and a heat pump, and the heat exchanger performs heat exchange using a refrigerant flowing between the heating tower and the heat pump. The heat supply system may be characterized in that a refrigerant used to supply hot water flows through the heat exchanger. The carbon dioxide liquefaction device may also be characterized by comprising a compressor that compresses carbon dioxide gas and a condenser that condenses the carbon dioxide gas compressed by the compressor, and the heat exchanger is disposed between the compressor and the condenser and cools the carbon dioxide gas compressed by the compressor. The carbon dioxide liquefaction device may also be characterized in that it includes a precooler that cools the carbon dioxide gas compressed by the compressor, and the heat exchanger is disposed between the compressor and the precooler. The carbon dioxide liquefaction device may also be characterized by comprising a precooler that cools the carbon dioxide gas compressed by the compressor and a dehumidifier that dehumidifies the carbon dioxide gas, and the heat exchanger is disposed between the precooler and the dehumidifier. The carbon dioxide liquefaction device may also be characterized in that it includes a precooler that cools the carbon dioxide gas compressed by the compressor and a dehumidifier that dehumidifies the carbon dioxide gas, and the heat exchanger is disposed between the dehumidifier and the condenser. The carbon dioxide liquefaction device also includes a compressor that compresses carbon dioxide gas and a condenser that condenses the carbon dioxide gas compressed by the compressor, and the heat exchanger is capable of cooling the refrigerant used in the condenser.

[0006] From another perspective, the carbon dioxide liquefaction system to which the present invention is applied is a carbon dioxide liquefaction system that supplies electricity and heat to an area where multiple facilities are installed, recovers carbon dioxide gas generated when the electricity or heat is produced, and cools the carbon dioxide gas when recovering the carbon dioxide gas using the refrigerant that was used when supplying the heat. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a carbon dioxide liquefaction system that efficiently liquefies carbon dioxide gas when performing energy management in a region. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a local energy management system to which a first embodiment is applied. [Figure 2] FIG. 1 shows a carbon dioxide capture device. [Figure 3] FIG. 1 shows a carbon dioxide liquefaction device. [Figure 4] FIG. 10 is a diagram showing a carbon dioxide liquefaction device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments to which the present invention is applied will be described with reference to the accompanying drawings. First Embodiment FIG. 1 is a diagram showing a local energy management system 1 to which the first embodiment is applied. The local energy management system 1 manages the supply of energy used not in a single facility but in multiple facilities within a region 2. Examples of the energy supplied here include electricity and heat. Examples of the multiple facilities within region 2 to which energy is supplied include office buildings, apartment buildings, commercial facilities, accommodation facilities, hospitals, and cultural facilities. The local energy management system 1 also recovers carbon dioxide gas that is generated when combustible gas is burned to generate electricity. The local energy management system 1 also liquefies the recovered carbon dioxide gas for reuse.

[0010] The regional energy management system 1 includes an electric power supply system 50 and a hot and cold energy supply system 70. The electric power supply system 50 supplies electric power to a plurality of facilities in the region 2. The hot and cold energy supply system 70 supplies heat for cooling, heating, and hot water supply to a plurality of facilities in the region 2. Here, heat includes hot and cold energy, and cold energy is the ability to remove heat from the surroundings and provide cooling.

[0011] The local energy management system 1 also includes a carbon dioxide capture device 90 and a carbon dioxide liquefaction device 10. The carbon dioxide capture device 90 captures carbon dioxide gas from exhaust gas generated within the local energy management system 1. The carbon dioxide liquefaction device 10 liquefies the captured carbon dioxide gas. The carbon dioxide liquefied by the carbon dioxide liquefaction device 10 is filled into, for example, a tank truck or a carbon dioxide gas cylinder and transported to a location where the liquefied carbon dioxide will be used.

[0012] [Power supply system 50] The power supply system 50 includes a power receiving and transforming facility 51 and a cogeneration facility 52 . The power receiving and transforming equipment 51 is an electrical equipment for taking in grid power and distributing it to the area 2.

[0013] The cogeneration facility 52 generates electricity and converts the waste heat generated into thermal energy to produce steam and hot water. The generated electricity and the produced steam and hot water are used to supply heat to multiple facilities in Area 2. The cogeneration facility 52 includes a gas power generation facility 53 such as a gas engine or a gas turbine, and an exhaust heat recovery facility 54 such as an exhaust gas boiler. The cogeneration facility 52 also includes a fuel cell type. The gas power generation facility 53 generates electricity using combustible gas as fuel. An example of the combustible gas burned by the gas power generation facility 53 is city gas. The exhaust heat recovery equipment 54 recovers exhaust heat generated by the operation of the gas power generation equipment 53 and produces steam and hot water.

[0014] [Heat and cold supply system 70] The hot and cold heat supply system 70 produces cold water and hot water and supplies the cold water and hot water to the area 2. The hot and cold heat supply system 70 is an example of a heat supply system. The hot and cold heat supply system 70 may be installed in one or more plants. The hot and cold heat supply system 70 includes one or more heating towers 71 and one or more heating tower heat pumps 72. The hot and cold heat supply system 70 also includes a brine pipe 73 that connects the heating towers 71 and the heating tower heat pumps 72.

[0015] The heating tower 71 functions as a heating tower during heating operation and absorbs heat from the atmosphere. The heating tower 71 also functions as a cooling tower during cooling operation and releases heat into the atmosphere. In this embodiment, there is one heating tower 71. The heating tower 71 is placed outdoors, for example, on the roof of a building.

[0016] The heating tower heat pump 72 is an example of a heat pump and is a compression-type heat pump. The heating tower heat pump 72 generates cold or hot water by switching the order of the refrigeration cycle of compression, condensation, expansion, and evaporation using a four-way valve.

[0017] Circulating water used by the heating tower 71 and the heating tower heat pump 72 flows inside the brine pipe 73. During heating operation, the temperature of this refrigerant drops below freezing (0°C or below), so antifreeze (brine) is used in the circulating water to prevent freezing. Hereinafter, the circulating water used by the heating tower 71 and the heating tower heat pump 72 will be referred to as brine HT. Note that the brine HT flowing between the heating tower 71 and the heating tower heat pump 72 is set to -8°C to -10.7°C during heating operation. During heating operation, the heating tower heat pump 72 absorbs heat from the brine HT flowing through the brine pipe 73. That is, during heating operation, the brine HT flowing from the heating tower heat pump 72 to the heating tower 71 has a lower temperature than the brine HT flowing from the heating tower 71 to the heating tower heat pump 72.

[0018] In Fig. 1, the brine pipe 73 is shown as a single line, but the brine pipe 73 comprises a pipe through which the brine HT flows from the heating tower heat pump 72 to the heating tower 71, and a pipe through which the brine HT flows from the heating tower 71 to the heating tower heat pump 72 (see Fig. 2). In addition, a branch pipe 74 branching off from the pipe through which the brine HT flows from the heating tower heat pump 72 to the heating tower 71 is connected to the brine pipe 73. The other end of this branch pipe 74 is connected to the carbon dioxide liquefaction apparatus 10. This branch pipe 74 comprises a pipe through which the brine HT flows from the branched portion with the brine pipe 73 to the carbon dioxide liquefaction apparatus 10 to the branched portion, and a pipe through which the brine HT flows from the carbon dioxide liquefaction apparatus 10 to the branched portion (see Fig. 2).

[0019] The turbo chiller 76 generates chilled water. The turbo chiller 76 is a compression-type heat pump. A compression-type heat pump uses a refrigerant to repeat a refrigeration cycle of condensation, expansion, evaporation, and compression, and generates chilled water through heat exchange during this cycle.

[0020] The chilled / hot water generator 77 generates chilled water and hot water. The chilled / hot water generator 77 is an absorption heat pump. The chilled / hot water generator 77 is a device that uses water as a refrigerant and an absorbing liquid (for example, a lithium bromide solution) to repeat a refrigeration cycle of evaporation, absorption, regeneration, and condensation, and generates chilled / hot water through heat exchange during this cycle. The chilled / hot water generator 77 generates thermal energy for regenerating the absorbing liquid by burning combustible gas.

[0021] The waste heat recovery type chilled / hot water generator 78 generates chilled water or hot water using waste heat. Similar to the chilled / hot water generator 77, the waste heat recovery type chilled / hot water generator 78 is a device that uses a refrigerant and an absorbing liquid to repeat a refrigeration cycle of evaporation, absorption, regeneration, and condensation, and generates chilled / hot water through heat exchange during this cycle. Here, the waste heat recovery type chilled / hot water generator 78 uses hot water supplied from the waste heat recovery equipment 54 via the hot water pipe 56 as thermal energy for regenerating the absorbing liquid. The cooling tower 75 exchanges heat between the atmosphere and a refrigerant used in a turbo chiller 76, a chilled / hot water generator 77, a waste heat recovery chilled / hot water generator 78, etc.

[0022] The heat storage tank 81 stores heat produced by each heat source facility and provides the heat to the region 2. For example, the heat storage tank 81 can improve economic efficiency by storing heat at night when electricity rates are low and supplying it to the region 2 during the day when electricity rates are high, and can also reduce the capacity of the heat source facility to hold down costs. The heat storage tank 81 includes a hot water tank 82 and a cold water tank 83.

[0023] Next, the carbon dioxide capture device 90 will be described with reference to FIG. FIG. 2 is a diagram showing a carbon dioxide capture device 90. [Carbon dioxide capture device 90] The carbon dioxide capture device 90 separates and captures carbon dioxide in the exhaust gas. In this embodiment, the carbon dioxide capture device 90 captures the exhaust gas from a flue 55 connected to the exhaust heat recovery equipment 54. The carbon dioxide capture device 90 includes an absorption tower and a regeneration tower, both not shown. An aqueous solution of an amine compound is stored in the absorption tower, and the aqueous solution of the amine compound absorbs carbon dioxide. The aqueous solution of the amine compound that has absorbed the carbon dioxide is then transported to the regeneration tower. In the regeneration tower, the aqueous solution of the amine compound that has absorbed the carbon dioxide is heated, and the carbon dioxide is separated. The carbon dioxide capture device 90 captures the separated carbon dioxide gas. The carbon dioxide capture device 90 also processes the exhaust gas after the carbon dioxide has been absorbed by the amine compound, and releases it into the atmosphere from the flue 55. In this embodiment, carbon dioxide is recovered using a chemical adsorption method that uses an amine compound, but other methods such as physical adsorption or membrane separation may also be used to separate and recover carbon dioxide.

[0024] [Carbon dioxide liquefaction device 10] Next, the configuration of the carbon dioxide liquefaction device 10 will be described with reference to FIG. FIG. 3 is a diagram showing a carbon dioxide liquefaction device 10. The carbon dioxide liquefaction apparatus 10 includes a scrubbing tower 11, a gas holder 12, a compression unit 13, a precooler 14, a purification tower 15, a dehumidifier 16, a condenser 17, and a distillation tower 18. The carbon dioxide liquefaction apparatus 10 also includes heat exchangers 21 to 23 for cooling the carbon dioxide gas.

[0025] The scrubber 11 removes impurities contained in the carbon dioxide gas recovered by the carbon dioxide recovery device 90. For example, a filter is provided in the scrubber 11, and impurities such as ash are removed by the filter. In addition, for example, purified water is sprayed onto the carbon dioxide gas inside the scrubber 11, thereby removing the amine-based aqueous solution contained in the carbon dioxide gas. The gas holder 12 is a tank for storing carbon dioxide gas. For example, when the amount of carbon dioxide gas generated from the cogeneration facility 52 fluctuates, the gas holder 12 adjusts the timing for sending the carbon dioxide gas to the next process. The compression unit 13 is an example of a compressor that compresses carbon dioxide gas. The carbon dioxide gas compressed by the compression unit 13 increases in pressure and temperature.

[0026] The precooler 14 is a heat exchanger that exchanges heat with the carbon dioxide gas. The refrigerant used in the precooler 14 may be a refrigerant dedicated to the precooler 14, or may be the same refrigerant as that used in the condenser 17. The precooler 14 cools the carbon dioxide gas, the temperature of which has been increased by the compression unit 13, to a temperature at which the carbon dioxide gas can be introduced into the purification column 15, which is the downstream process. The purification column 15 removes impurities contained in the carbon dioxide gas. The purification column 15 is equipped with activated carbon and aluminum oxide inside. The impurities are adsorbed by the activated carbon inside the purification column 15, and the impurities in the carbon dioxide gas are removed. The dehumidifier 16 removes moisture from the carbon dioxide gas. The dehumidifier 16 is filled with an adsorbent that selectively adsorbs moisture. Examples of the adsorbent include activated alumina gel and synthetic zeolite.

[0027] The condenser 17 includes a brine unit 171 , a condensation heat exchanger 172 , and a brine pipe 173 . The brine unit 171 is a device for cooling brine, which is a refrigerant used in the condensing heat exchanger 172. Hereinafter, the brine used in the condenser 17 will be referred to as brine G. The condensing heat exchanger 172 condenses and liquefies carbon dioxide gas. The condensing heat exchanger 172 uses the brine G to cool the carbon dioxide gas.

[0028] Distillation column 18 separates liquefied carbon dioxide from carbon dioxide gas. The liquefied carbon dioxide separated in distillation column 18 is filled into a gas cylinder, for example. Furthermore, the carbon dioxide gas separated in distillation column 18 may be returned to the process of condenser 17 again, or may be reused as carbon dioxide gas.

[0029] Brine HT used in the heating tower 71 and the heating tower heat pump 72 flows through the heat exchangers 21-23 provided in the carbon dioxide liquefaction apparatus 10. The heat exchangers 21-23 exchange heat between the brine HT flowing between the heating tower 71 and the heating tower heat pump 72 and the carbon dioxide gas flowing through the pipes of the carbon dioxide liquefaction apparatus 10. These heat exchangers 21-23 are provided between the compression unit 13 and the condenser 17. The heat exchangers 21-23 lower the temperature of the carbon dioxide gas whose temperature has been raised by the compression unit 13.

[0030] The heat exchanger 21 is provided between the compression unit 13 and the precooler 14. The heat exchanger 22 is provided between the precooler 14 and the purifying column 15. The heat exchanger 23 is provided between the dehumidifier 16 and the condenser 17.

[0031] [State of carbon dioxide in carbon dioxide liquefaction equipment] An example of the state of carbon dioxide in the carbon dioxide liquefaction device 10 will be described with reference to FIG. The carbon dioxide gas recovered by the carbon dioxide recovery unit 90 (see FIG. 2) is fed into the scrubbing tower 11 in the carbon dioxide liquefaction unit 10. The carbon dioxide gas fed into the scrubbing tower 11 has purified water sprayed onto it in the scrubbing tower 11, thereby reducing its temperature.

[0032] The carbon dioxide gas is then sent to compression unit 13 via gas holder 12. In order for the carbon dioxide gas to undergo a phase transition to liquid carbon dioxide, the pressure of the carbon dioxide gas must be higher than the triple point pressure of carbon dioxide (0.518 MPa). In compression unit 13, the carbon dioxide gas is compressed to a pressure that is at least higher than the triple point pressure of carbon dioxide. At this time, as the carbon dioxide gas is compressed, the temperature of the carbon dioxide gas rises.

[0033] Next, in the precooler 14, the carbon dioxide gas is cooled to a temperature that allows it to be introduced into the subsequent purification column 15 and dehumidifier 16. In the condenser 17, the carbon dioxide gas is cooled to a temperature lower than the temperature at which the carbon dioxide gas liquefies. In the condenser 17, the carbon dioxide gas is liquefied to become liquefied carbon dioxide.

[0034] As described above, in the carbon dioxide liquefaction device 10, the carbon dioxide gas is compressed by the compression unit 13, and the carbon dioxide gas whose temperature has increased is cooled until it is liquefied. In this embodiment, heat exchangers 21 to 23 are provided between after the compression unit 13 and before the condenser 17. These heat exchangers 21 to 23 cool the carbon dioxide gas, thereby reducing the cooling load of the condenser 17 and the precooler 14.

[0035] More specifically, the heat exchanger 21 is disposed after the compression unit 13 and before the precooler 14. The carbon dioxide gas is cooled by passing through the heat exchanger 21. This reduces the amount of heat exchange that occurs in the precooler 14, and the cooling load of the precooler 14 is reduced.

[0036] The heat exchanger 22 is disposed after the precooler 14 and before the purification column 15. The carbon dioxide gas is cooled by passing through the heat exchanger 22. This reduces the amount of heat exchange required in the condenser 17 disposed after the heat exchanger 22, thereby reducing the cooling load of the condenser 17. Furthermore, for example, when the carbon dioxide gas is cooled, some of the water vapor in the carbon dioxide gas may be liquefied and the liquefied moisture may be removed. In this case, the dehumidification load on the dehumidifier 16 is reduced.

[0037] Heat exchanger 23 is disposed after dehumidifier 16 and before condenser 17. Carbon dioxide gas is cooled as it passes through heat exchanger 23. This reduces the amount of heat exchange required in condenser 17, thereby reducing the cooling load of condenser 17. Furthermore, because heat exchanger 23 is disposed after dehumidifier 16 and cools carbon dioxide gas with little moisture, there is less risk of freezing compared to when carbon dioxide gas contains a lot of moisture. Therefore, heat exchanger 23, which is disposed after dehumidifier 16, can lower the temperature of carbon dioxide gas more than heat exchangers 21 and 22, which are disposed before dehumidifier 16, and the cooling load of condenser 17 can be further reduced.

[0038] In this embodiment, the heat exchangers 21 to 23 are arranged in the following order from upstream to downstream with respect to the flow of the brine HT: heat exchanger 23, heat exchanger 22, heat exchanger 21. In other words, the temperature of the brine HT flowing through the heat exchangers 21 to 23 decreases in the order of heat exchanger 23, heat exchanger 22, and heat exchanger 21. Furthermore, with respect to the flow of carbon dioxide gas, the heat exchangers are arranged in the following order from upstream to downstream with respect to the flow of carbon dioxide gas. In other words, the temperature of the carbon dioxide gas that exchanges heat decreases in the order of heat exchanger 23, heat exchanger 22, and heat exchanger 21.

[0039] In this embodiment, the precooler 14 and the condenser 17 function as devices for cooling the carbon dioxide gas. The precooler 14 cools the carbon dioxide gas so that the temperature of the carbon dioxide gas to be introduced into the purification column 15 is appropriate. The condenser 17 cools the carbon dioxide gas to a temperature at which the carbon dioxide gas is liquefied.

[0040] Although the first embodiment includes three heat exchangers 21 to 23, the number of heat exchangers may be one or two, or four or more.

[0041] <Second embodiment> In the first embodiment, the brine HT is used to cool the carbon dioxide gas flowing inside the carbon dioxide liquefaction apparatus 10. In the second embodiment, the brine HT is used to cool the brine G in the condenser 17 of the carbon dioxide liquefaction apparatus 10.

[0042] 4 is a diagram showing a carbon dioxide liquefaction device 210 according to the second embodiment. Note that the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted here. The condenser 217 of the carbon dioxide liquefaction device 210 includes a brine unit 171 , a condensing heat exchanger 172 , a brine pipe 173 , and a brine heat exchanger 24 .

[0043] The brine heat exchanger 24 exchanges heat with the brine G flowing in the brine pipe 173 of the brine unit 171. A branch pipe 74 is drawn into the brine heat exchanger 24, and the brine G in the condenser 217 is cooled by using the brine HT. The brine heat exchanger 24 is provided downstream of the condensing heat exchanger 172 and upstream of the brine unit 171 in the flow direction of the brine G. The brine heat exchanger 24 cools the brine G whose temperature has been increased by the condensing heat exchanger 172. The brine G cooled by the brine heat exchanger 24 flows into the brine unit 171.

[0044] In the second embodiment, the brine G is cooled by the brine heat exchanger 24, which reduces the load on the brine unit 171. This allows, for example, the size of the brine unit 171 to be reduced, and the size of the carbon dioxide liquefaction apparatus 210 to be reduced.

[0045] <Other configurations> In the first embodiment, the heat exchangers 21 to 23 are arranged in series on a single branch pipe 74. However, the heat exchangers 21 to 23 may be arranged in parallel by branching the branch pipe 74. The number of heat exchangers provided in the carbon dioxide liquefaction apparatus 10 is not limited to three. For example, the heat exchangers provided in the carbon dioxide liquefaction apparatus 10 may be one or two of the heat exchangers 21 to 23. Heat exchangers may be arranged at different positions in the carbon dioxide liquefaction apparatus 10 as needed to exchange heat with the carbon dioxide gas. For example, a heat exchanger may be provided between the purifying column 15 and the dehumidifier 16, and the carbon dioxide gas may be cooled by the brine HT. The brine HT may be used to cool the carbon dioxide gas flowing through the carbon dioxide liquefaction apparatus 10 and further cool the brine G in the condenser 17. That is, the first embodiment and the second embodiment may be combined as appropriate. The brine used in the precooler 14 may also be cooled.

[0046] In this embodiment, the carbon dioxide gas generated from the cogeneration facility 52 is captured and liquefied, but carbon dioxide gas generated from other facilities may also be captured. For example, the carbon dioxide capture device 90 may capture carbon dioxide gas generated when the hot and cold water generator 77, a boiler, or the like burns combustible gas to produce heat. [Explanation of symbols]

[0047] 1...Regional energy management system, 10,210...Carbon dioxide liquefaction device, 13...Compression unit, 14...Precooler, 15...Purification tower, 16...Dehumidifier, 17...Condenser, 21-23...Heat exchanger, 24...Brine heat exchanger, 52...Cogeneration equipment, 53...Gas power generation equipment, 54...Waste heat recovery equipment, 71...Heating tower, 72...Heating tower heat pump, 73,173...Brine pipe, 74...Branch pipe, 171...Brine unit, 172...Condensation heat exchanger, 217...Condensation

Claims

1. a heat supply system that supplies heat for cooling or heating to a plurality of buildings; a carbon dioxide capture device that captures carbon dioxide gas; a carbon dioxide liquefaction device that liquefies the carbon dioxide gas recovered by the carbon dioxide recovery device; Equipped with The carbon dioxide liquefaction device includes a heat exchanger that performs heat exchange using a refrigerant used in the heat supply system. A carbon dioxide liquefaction system characterized by:

2. The heat supply system supplies heat using a heating tower and a heat pump; The heat exchanger performs heat exchange using a refrigerant flowing between the heating tower and the heat pump.

2. The carbon dioxide liquefaction system according to claim 1.

3. The heat supply system allows the refrigerant to flow through the heat exchanger when supplying hot water.

3. The carbon dioxide liquefaction system according to claim 2.

4. The carbon dioxide liquefaction device includes a compressor that compresses carbon dioxide gas and a condenser that condenses the carbon dioxide gas compressed by the compressor, The heat exchanger is disposed between the compressor and the condenser and cools the carbon dioxide gas compressed by the compressor.

2. The carbon dioxide liquefaction system according to claim 1.

5. the carbon dioxide liquefaction device includes a precooler that cools the carbon dioxide gas compressed by the compressor, The heat exchanger is disposed between the compressor and the precooler.

5. The carbon dioxide liquefaction system according to claim 4.

6. the carbon dioxide liquefaction device includes a precooler that cools the carbon dioxide gas compressed by the compressor, and a dehumidifier that dehumidifies the carbon dioxide gas; The heat exchanger is disposed between the precooler and the dehumidifier.

5. The carbon dioxide liquefaction system according to claim 4.

7. the carbon dioxide liquefaction device includes a precooler that cools the carbon dioxide gas compressed by the compressor, and a dehumidifier that dehumidifies the carbon dioxide gas; The heat exchanger is disposed between the dehumidifier and the condenser.

5. The carbon dioxide liquefaction system according to claim 4.

8. The carbon dioxide liquefaction device includes a compressor that compresses carbon dioxide gas and a condenser that condenses the carbon dioxide gas compressed by the compressor, The heat exchanger cools the refrigerant used in the condenser.

2. The carbon dioxide liquefaction system according to claim 1.

9. Supplying electricity and heat to areas where multiple facilities are located, recovering carbon dioxide gas generated during the production of the electricity or the heat; A carbon dioxide liquefaction system that cools the carbon dioxide gas when recovering the carbon dioxide gas using the refrigerant that is used when supplying the heat.

Images