JP6671651B1 - Cold water supply system that stores and uses LNG cold heat - Google Patents

Abstract

The LNG vaporizer, which exchanges the LNG cold heat generated when the liquefied natural gas is vaporized, is used to generate natural gas for use in industrial equipment. The LNG satellite base is placed close to the LNG satellite base and cooled by the LNG cold heat. A cold water utilization facility provided with a cold water utilization unit for utilizing cold water, a heat storage tank provided between the LNG vaporizer and the cold water utilization facility for storing LNG cold heat, and a refrigerating capacity of the LNG vaporizer having a cold water utilization facility. When the cold energy demand exceeds the cold energy demand, the LNG cold energy of the excess cold energy that exceeds the cold energy demand is stored in the heat storage tank, and when the cold energy demand at the cold water utilization facility exceeds the refrigerating capacity, the refrigerating capacity is insufficient for the cold energy demand. Chilled water for storing and utilizing LNG cold heat, which includes a control device for controlling insufficient cold heat from the heat storage tank to be supplied to the cold water utilization unit as low temperature cold water A feeding system.

Description

  The present invention relates to a chilled water supply system that utilizes LNG cold generated by an LNG vaporizer that vaporizes liquefied natural gas.

The problem of global warming is becoming more and more serious, and a fuel shift from coal or oil having a large carbon dioxide (CO ₂ ) emission factor to natural gas having a small emission factor has begun, and many liquefied natural gas (LNG) ) A satellite base is being built. A large amount of LNG cold heat is generated at the LNG satellite base.
Although LNG refrigeration is extremely useful, it is rarely used effectively and is discarded after being vaporized with seawater or hot water.

  Also, in recent years, consumers have become more and more interested in food safety and security, and in response to this, there has been remarkable technological innovation in plant factories that produce plants in artificial environments, and plant factories are cooled with LNG heat. ing.

  The plant factory utilizing sunlight is an extension of conventional house cultivation, and the cultivated plants are leafy vegetables such as salad vegetables and leaf lettuce, as well as fruits such as tomatoes and strawberries. Since this method is limited to a flat surface, a vast site is required. In addition, since the indoor environment is affected by the presence or absence of solar radiation and changes in the outside air temperature, the demand for cooling heat changes drastically, requiring a large amount of energy for cooling in summer and heating in winter.

  The cultivated plants of the fully controlled plant factory are limited to leafy vegetables, but they can be multi-layer cultivated and can be mass-produced on narrow land regardless of the weather or location. However, the construction cost of the building, the cooling device, and the cultivation device (including the lighting device) is high, and the consumption of the power for lighting and the power for cooling and heating required throughout the year is extremely large. As described above, there is a problem that power costs are large in a plant factory, and LNG cold generated by an LNG vaporizer that vaporizes liquefied natural gas is used for cooling in the plant factory.

Patent Document 1 discloses an LNG vaporizer for exchanging heat between liquefied natural gas and a first intermediate medium to vaporize liquefied natural gas, and a first heat exchanger for exchanging heat between a first intermediate medium and a second intermediate medium. A plant factory system using LNG cold heat, which includes a second intermediate medium and a second heat exchanger that performs heat exchange between air in the plant factory, is disclosed.
Patent Literature 2 discloses an air conditioning system in a plant factory that air-conditions a greenhouse in which cultivated plants are cultivated. In the air conditioning system, water in a cold storage heat tank is cooled by electric power at night to store cold, and cold water in the cold storage heat tank is filled with air conditioning. There is disclosed an air conditioning system in a plant factory which can reduce the running cost of supplying cold air to a local space by exchanging heat with air sucked from a local space in a greenhouse by a filling type air conditioner.
Patent Document 3 discloses an industrial plant that is a source of carbon dioxide, an LNG base that stores liquefied natural gas, a plant factory that produces plants, and a method of drying carbon dioxide generated in an industrial plant using liquefied natural gas. An air conditioning system is described which includes a dry ice producing facility for producing ice and uses a dry ice produced by the dry ice producing facility as a supply source for applying carbon dioxide to plants and a cold heat source for cooling.

Utility Model Registration No. 3209642 JP 2000-93010 A JP 2011-250759 A

  The supply capacity (refrigeration capacity) of LNG cold heat varies throughout the day because, for example, the consumption of natural gas (NG) varies according to the increase or decrease in the amount of power generation. The cooling demand (cooling load or cooling load such as process) of facilities using LNG also changes throughout the day. Since the refrigerating capacity does not coincide with the changing trend of the cold heat demand, it has been difficult to effectively use the LNG cold heat without waste.

In the system described in Patent Literature 1, a change in the refrigeration capacity of an LNG vaporizer due to a change in the amount of liquefied natural gas vaporized according to a change in natural gas consumption throughout the day, and a change in refrigeration in a plant factory There is a problem that the plant factory cannot be properly cooled due to a difference from a change in demand. Therefore, it is only possible to construct a plant factory of a scale where the cooling demand in the plant factory does not exceed the refrigeration capacity of the LNG vaporizer.
In the device described in Patent Document 2, water in a cold storage tank that stores cold water is cooled by nighttime electric power to store cold water, and the cold water in the cold storage heat tank is introduced into a chargeable air conditioner during the day to remove air. Since it cools and supplies cool air into the greenhouse, nighttime electricity usage fees are required. Further, the capacity of the refrigerator and the heat storage tank is increased only by using the nighttime electric power.
In the system described in Patent Literature 3, carbon dioxide generated in an industrial plant is converted into dry ice using liquefied natural gas supplied from an LNG terminal, and the dry ice is converted into carbon dioxide in a plant factory and given to plants. Therefore, a dry ice production facility for separating carbon dioxide from exhaust gas generated in an industrial plant to produce dry ice is required.

An object of the present invention is to provide a temperature stratified chilled water heat storage tank for storing LNG chilled heat generated at an LNG satellite base between an LNG satellite base for supplying natural gas to industrial equipment and a chilled water utilization facility, and to provide a heat treatment tank throughout the day. Regardless of the difference between the change trend of the refrigeration capacity in the LNG vaporizer and the change trend of the chilled heat demand in the chilled water utilization facility, the LNG chilled heat capable of providing the chilled water cooled by the LNG chilled heat used in the chilled water utilization facility only by the LNG chilled heat is used. An object of the present invention is to provide a cold water supply system for storing and using heat.

A first means for solving the problem is a chilled water type LNG vaporization in which LNG cold generated when liquefied natural gas is vaporized is directly exchanged between the liquefied natural gas and chilled water to convert the chilled water to low-temperature chilled water. Chilled water provided with an LNG satellite base for generating natural gas used in industrial equipment by a vessel, and a chilled water utilization unit disposed in close proximity to the LNG satellite base and utilizing the low-temperature chilled water cooled by the LNG chilled heat A low-temperature section for storing the low-temperature chilled water supplied from the chilled-water LNG vaporizer and a high-temperature chilled water returned from the chilled-water usage section, provided between the utilization facility and the chilled water LNG vaporizer and the chilled water utilization facility. A first three-way valve and a temperature-stratified chilled water heat storage tank in which a high-temperature portion for storing water is formed, and a pipe connecting the temperature-stratified chilled water heat storage tank to a chilled water inlet of the chilled water LNG vaporizer. A constant flow pump is sequentially interposed, and two inlets of the first three-way valve are respectively connected to the high temperature part and the low temperature part of the temperature stratified chilled water heat storage tank, and the chilled water is supplied to the chilled water LNG vaporizer. Return, a first chilled water circulation circuit for supplying the low-temperature chilled water from the chilled water LNG vaporizer to the low-temperature portion of the temperature-stratified chilled water storage tank, and a first chilled water circulation tank and an inlet of the chilled water utilization unit. A second three-way valve and a variable flow pump are sequentially interposed therebetween, and two inflow ports of the second three-way valve are connected to the low-temperature part and the high-temperature part of the temperature-stratified cold water storage tank, respectively. The low-temperature chilled water and the high-temperature chilled water, the mixing ratio of which is adjusted by a three-way valve, are supplied to the chilled water utilization part to release the LNG chilled heat to become the high-temperature chilled water, and the high-temperature chilled water is controlled via a two-way valve that controls a flow rate. The cold water A second chilled water circulation circuit for returning from the outlet of the section to the high temperature section of the temperature stratified chilled water heat storage tank, a cooling device for cooling a condensing section provided in the industrial facility with cooling water or seawater, and A part of the cooling water or seawater, which is provided between a constant flow pump and the chilled water LNG vaporizer and is heated by exchanging heat in the condenser, is supplied, and returns to the chilled water LNG vaporizer. A backup heat exchanger that backs up the chilled water and raises the temperature, and circulates the chilled water at a constant flow rate to the first chilled water circulation circuit by the constant flow rate pump, and controls the first three-way valve to control the temperature of the stratified chilled water. The mixing ratio of the high-temperature chilled water and the low-temperature chilled water flowing out of the heat storage tank is adjusted to flow out of the chilled water LNG vaporizer and supplied to the low-temperature portion of the temperature stratified chilled water storage tank. Controlling the temperature, 2 While controlling the three-way valve to adjust the mixing ratio of the high-temperature chilled water and the low-temperature chilled water pumped by the variable flow rate pump from the temperature stratified chilled water heat storage tank, The flow rate of the returned high-temperature chilled water is controlled by the two-way valve to control the temperature of the high-temperature chilled water returned from the chilled water utilization section to the high-temperature section of the temperature-stratified chilled water storage tank, and the chilled water LNG vaporization is performed. When the refrigeration capacity of the vessel exceeds the cold demand in the cold water utilization facility, the low temperature chilled water for the excess refrigeration capacity in which the refrigeration capacity exceeds the cold demand is stored in the temperature stratified chilled water storage tank, and the cold heat in the cold water utilization facility is stored. When the demand exceeds the refrigeration capacity in the chilled water LNG vaporizer, the refrigeration capacity is insufficient for the chilled heat demand before the insufficient chilled heat is stored in the temperature stratified chilled water storage tank. A control device for controlling the first cold water circulating circuit and the second chilled water circulation circuit so as to supply to the cold water utilization unit at low temperature cold is a cold water supply system for use with heat storage of LNG cold with a.

A second means for solving the problem is used in industrial equipment by an LNG vaporizer for exchanging LNG cold generated when liquefied natural gas is vaporized between the liquefied natural gas and an antifreeze heat medium. An LNG satellite base for generating natural gas, a chilled water utilization facility provided in close proximity to the LNG satellite base and provided with a chilled water utilization unit utilizing low-temperature chilled water cooled by the LNG chilled heat, and the LNG vaporizer; A temperature stratified chilled water heat storage tank provided between the cold water utilization facility and having a low temperature section for storing the low temperature chilled water and a high temperature section for storing the high temperature chilled water returned from the chilled water utilization section; and the LNG vaporizer. A heat exchanger provided between the LNG vaporizer and the heat stratified chilled water storage tank; and circulating the antifreeze heat medium between the LNG vaporizer and the heat exchanger. A first antifreeze heat medium circulation that returns cold heat to the low temperature cold water by exchanging heat between the antifreeze heat medium and the cold water in the heat exchanger, and returns the antifreeze heat medium that has released the LNG cold heat to the LNG vaporizer. A circuit, a first three-way valve and a constant flow pump are sequentially interposed in a pipe connecting the temperature-stratified chilled water heat storage tank to the chilled water inlet of the heat exchanger, and the two inlets of the first three-way valve are The cold water is returned to the heat exchanger connected to the high-temperature portion and the low-temperature portion of the temperature-stratified cold water storage tank, and the low-temperature chilled water is transferred from the heat exchanger to the low-temperature portion of the temperature-stratified cold water storage tank. A second three-way valve and a variable flow rate pump are sequentially interposed between the third chilled water circulation circuit to be supplied, the temperature stratified chilled water heat storage tank, and the inlet of the chilled water utilization part, and the two flows of the second three-way valve are provided. The inlet is the low temperature section of the temperature stratified cold water storage tank and The low-temperature chilled water and the high-temperature chilled water, each connected to the high-temperature section and having a mixing ratio adjusted by the second three-way valve, are supplied to the chilled water utilization section to discharge the LNG chilled heat to form the high-temperature chilled water, and to adjust the flow rate. A fourth chilled water circulation circuit that returns the high-temperature chilled water from the outlet of the chilled water utilization unit to the high-temperature portion of the temperature-stratified chilled water storage tank via a controlled two-way valve, and cools a condensation unit provided in the industrial equipment. A cooling device that cools with water or seawater, a part of the cooling water or seawater that is provided between the constant flow pump and the heat exchanger in the pipeline and that heats up in the condensing section and heats up. A backup heat exchanger that backs up the chilled water that is supplied and returns to the heat exchanger and raises the temperature, and circulates a constant flow of the chilled water through the third chilled water circulation circuit with the constant flow pump, Before controlling the three-way valve The mixing ratio of the high-temperature chilled water and the low-temperature chilled water flowing out of the temperature-stratified chilled water heat storage tank is adjusted to flow out of the heat exchanger and supplied to the low-temperature portion of the temperature-stratified chilled water heat storage tank. Controlling the temperature of the low-temperature chilled water and controlling the second three-way valve to adjust the mixing ratio of the high-temperature chilled water and the low-temperature chilled water pumped by the variable flow pump from the temperature stratified chilled water heat storage tank; The two-way valve controls the flow rate of the high-temperature chilled water returned to the high-temperature section through the chilled water usage section, and the high-temperature chilled water returned to the high-temperature section of the temperature stratified chilled water storage tank from the chilled water usage section. Controlling the temperature, when the refrigeration capacity of the LNG vaporizer exceeds the cold demand in the chilled water utilization facility, the low-temperature chilled water of the excess refrigeration capacity in which the refrigeration capacity exceeds the cold demand is supplied to the temperature stratified chilled water storage tank. When the cold demand in the cold water utilization facility exceeds the refrigerating capacity in the LNG vaporizer, the low temperature stored in the temperature stratified cold water storage tank is the insufficient cold heat in which the refrigerating capacity is insufficient for the cold demand. A control device for controlling the third chilled water circulation circuit and the fourth chilled water circulation circuit so as to supply the chilled water to the chilled water utilization unit, and a LNG chilled heat is stored and used.

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The chilled water supply system according to the present invention for storing and utilizing LNG chilled heat, wherein the refrigeration capacity exceeds the chilled heat demand when the refrigeration capacity, which is the LNG chilled heat supply capacity at the LNG satellite base, exceeds the chilled heat demand at the chilled water utilization facility. of the LNG cold is stored in a temperature stratification formula cold water storage tank, when the cold demand in cold water utilization facility exceeds the cooling capacity of the LNG satellite terminals, temperature LNG cold lack cold fraction refrigerating capacity is insufficient for the cold demand The low-temperature chilled water stored in the stratified chilled water storage tank is supplied to the chilled water utilization facility. Thereby, irrespective of the difference between the changing trend of the refrigeration capacity at the LNG satellite base throughout the day and the changing trend of the chilled heat demand at the chilled water utilization facility, the chilled water used at the chilled water utilization facility can be covered only by the LNG chilled heat, LNG cold heat can be used to the maximum and the energy saving effect is great. Further, the running cost of the cold water utilization facility can be reduced.
Further, in the first means, a constant flow pump circulates a constant flow of chilled water through the first chilled water circulation circuit, and controls the first three-way valve so that the high-temperature chilled water and the low-temperature chilled water flowing out of the temperature stratified chilled water heat storage tank are separated. By adjusting the mixing ratio, it is possible to control the temperature of the low-temperature chilled water flowing out of the chilled water LNG vaporizer and supplied to the low-temperature portion of the temperature-stratified chilled water heat storage tank. Then, the second three-way valve is controlled to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water pumped by the variable flow rate pump from the temperature stratified cold water storage tank, and to control the high temperature returned to the high temperature section through the cold water utilization section. By controlling the flow rate of the cold water with the two-way valve, the temperature of the high-temperature cold water returned from the cold water utilization section to the high temperature section of the temperature stratified cold water storage tank can be controlled. Further, since a backup heat exchanger is provided to back up the chilled water returning to the chilled water LNG vaporizer and raise the temperature, the temperature of the chilled water vaporizes the liquefied natural gas in the chilled water LNG vaporizer without freezing the chilled water. If the temperature is lower than the temperature required for cooling, the temperature of the cold water can be backed up and raised.
In the second means, a constant flow pump circulates a constant flow of chilled water through a third chilled water circulation circuit and controls the first three-way valve to mix the high-temperature chilled water and the low-temperature chilled water flowing out of the temperature-stratified chilled water storage tank. , The temperature of the low-temperature chilled water flowing out of the heat exchanger and supplied to the low-temperature portion of the temperature-stratified chilled water heat storage tank can be controlled. Then, the second three-way valve is controlled to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water pumped by the variable flow rate pump from the temperature stratified cold water storage tank, and to control the high temperature returned to the high temperature section through the cold water utilization section. By controlling the flow rate of the cold water with the two-way valve, the temperature of the high-temperature cold water returned from the cold water utilization section to the high temperature section of the temperature stratified cold water storage tank can be controlled. Furthermore, since the backup heat exchanger for backing up the cold water returning to the heat exchanger and raising the temperature is provided, the temperature of the cold water can be backed up and raised so that the cold water does not freeze in the heat exchanger. .

Since the LNG refrigeration for the deficient heat of which refrigeration capacity is insufficient for the refrigeration demand is supplied from the LNG refrigeration stored in the temperature stratified chilled water storage tank to the chilled water utilization facility, the maximum amount of refrigeration demand for the chilled water utilization facility is It is not necessary to limit to the refrigeration capacity when the chilled heat demand at the utilization facility exceeds the refrigeration capacity at the LNG satellite base, and the chilled water utilization facility can be enlarged.

  Usually, cooling of a facility requires a refrigerator and a cooling tower, and an enormous amount of water (cooling tower makeup water) is used for cooling in the cooling tower and released to the atmosphere. Since a refrigerator and a cooling tower are not required, and the LNG cold generated at the LNG satellite base is stored and utilized to the utmost, the effect of saving water resources is great.

It is a block diagram showing the whole cold water supply system composition which accumulates and uses LNG cold energy concerning a 1st embodiment. It is a figure which shows the refrigerating capacity in a chilled water type vaporizer, and the cooling load of a complete control type plant factory according to time of day. It is a figure which shows a) temperature stratification type cold water heat storage device. It is a block diagram which shows the whole structure of the cold water supply system which accumulates and uses LNG cold heat concerning 2nd Embodiment. It is a figure which shows the refrigerating capacity in a chilled water type vaporizer, and the cooling load of a sunlight utilization type | mold plant factory according to time of day. It is a block diagram showing the whole cold water supply system composition which stores and uses LNG cold energy concerning a 3rd embodiment. FIG. It is a block diagram which shows the whole structure of the cold water supply system which accumulate | stores and uses LNG cold heat concerning a reference example . It is a figure which shows the ice heat storage tank in a reference example .

1. Configuration of First Embodiment A chilled water supply system 1a according to the first embodiment that stores and uses LNG cold heat includes a chilled water LNG vaporizer 11 that vaporizes liquefied natural gas (LNG), as shown in FIG. (LNG satellite base 10), a GTCC (Gas Turbine Combined Cycle) power plant 20 as an industrial facility for burning and utilizing natural gas (NG) vaporized by the chilled water LNG vaporizer 11, a LNG satellite base 10 and GTCC A chilled water heat storage tank that is provided between the chilled water LNG vaporizer 11 and the plant factory 30 and that stores low-temperature chilled water. 40, low-temperature chilled water is supplied from the chilled water LNG vaporizer 11 to the chilled water heat storage tank 40, and the chilled water is returned from the chilled water heat storage tank 40 to the chilled water LNG vaporizer 11. The first chilled water circulation circuit 50 and the chilled water cooled by LNG chilled heat from the chilled water storage tank 40 are supplied to the chilled water utilization unit to release the LNG chilled heat to become high-temperature chilled water, and the second chilled water is returned to the chilled water storage tank 40 from the high-temperature chilled water A circulation circuit 60.

  The LNG satellite base 10 is provided near a GTCC power plant 20 which is an industrial facility, and stores an LNG tank 12 for storing liquefied natural gas transported from a port by an LNG tank lorry, and a liquefied natural gas supplied from the LNG tank 12. A chilled water vaporizer 11 is provided which is vaporized with cold water at 12 to 30 ° C. to produce natural gas. As a result, the LNG satellite base 10 performs the GTCC power generation by the chilled water LNG vaporizer 11 in which the LNG cold generated when the liquefied natural gas is vaporized is directly exchanged between the liquefied natural gas and the chilled water to make the chilled water the low-temperature chilled water. Generates natural gas used in plant 20. As the chilled water vaporizer 11, for example, a low temperature liquefied gas vaporizer described in Japanese Patent No. 4442297 is used. This low-temperature liquefied gas vaporizer is sold by Kobe Steel Ltd. as KOBELCO cold water type LNG vaporizer model KSH.

  The GTCC power generation plant 20 is known, and a gas turbine power generation device is operated by burning natural gas supplied from the chilled water LNG vaporizer 11, and heat is recovered from an exhaust gas discharged from the gas turbine by an exhaust heat recovery boiler. And a condensing turbine power generation device that is operated with the steam generated as a result. A cooling device 21 is provided in the GTCC power generation plant 20, and steam discharged from the condensing turbine power generation device is condensed in a condenser 22 of the cooling device 21 and returned to the exhaust heat recovery boiler. The cooling device 21 includes a circulation circuit 24 that circulates cooling water between the condenser 22 and the cooling tower 23. Note that the cooling device 21 may use seawater instead of the cooling water, pump seawater from the sea with a pump, supply the seawater to the condensing unit 22, and discharge the steam to the sea after condensing the steam.

  A fully-controlled plant factory 30, which is a chilled water utilization facility, is arranged in close proximity to the LNG satellite base 10 and the GTCC power plant 20, and creates light and dark periods by lighting, and supplies electric power, carbon dioxide, water, fertilizer, and the like. Automatically supplied to grow plants artificially. The plant factory 30 is provided with a cooling indoor unit having a cooling water coil 31 for cooling and a fan, and the cooling water coil 31 for cooling, which is a cooling water utilization unit of the cooling utilization facility, receives cold water between the cooling water storage tank 40 and the cooling water storage tank 40. The plant factory 30 is cooled using cold water circulated by the second cold water circulation circuit 60 and cooled by LNG cold heat.

A cold water storage tank 40 for storing low-temperature cold water is provided between the LNG satellite base 10 and the plant factory 30. The cold water storage tank 40 has a low-temperature section 43 for storing low-temperature cold water (for example, 8 ° C.) and a high-temperature section 44 for storing high-temperature cold water (for example, 20 ° C.). As the cold water heat storage tank, a known temperature stratified cold water heat storage tank having a high-temperature portion formed on the upper side and a low-temperature portion formed on the lower side as described in Japanese Patent No. 3578973 is used.

The first chilled water circulation circuit 50 connects the chilled water outlet of the chilled water LNG vaporizer 11 of the LNG satellite base 10 to a low temperature part 43 formed below the chilled water heat storage tank 40 by a pipe line 51, and Is connected to the cold water inlet of the cold water type LNG vaporizer 11 by a pipe 52. A first three-way valve 53 and a constant flow pump 54 are sequentially interposed in the pipeline 52 from the upstream side, and the high-temperature part 44 and the low-temperature part 43 of the cold water heat storage tank 40 are connected to the two inlets of the first three-way valve 53 , respectively. Have been.

  In the pipe line 52, a backup heat exchanger 70 is provided between the constant flow pump 54 and the chilled water LNG vaporizer 11, and the chilled water returning from the chilled water heat storage tank 40 to the chilled water LNG vaporizer 11 is used for the backup heat exchange. The temperature is raised by the vessel 70. Thereby, when the temperature of the chilled water returning to the chilled water LNG vaporizer 11 is lower than the temperature required to vaporize the liquefied natural gas in the chilled water LNG vaporizer 11 without freezing the chilled water, the temperature of the chilled water is backed up. The temperature can be raised.

  In the gas turbine combined cycle power plant 20, the heat is exchanged with the steam in the condenser 22 between the intermediate portion between the condenser 22 and the cooling tower 23 of the circulation circuit 24 of the cooling device 21 of the cooling device 21 and the backup heat exchanger 70, and the temperature rises. The warmed cooling water is circulated, and the cold water returning to the cold water type LNG vaporizer 11 is backed up and heated.

  A three-way valve 71 is interposed between the backup heat exchanger 70 and the chilled water LNG vaporizer 11 in the pipe 52, and an inlet and an outlet of the three-way valve 71 are connected to the pipe 52. One end of a return pipe 72 is connected to the pipe 52 between the constant flow pump 54 and the backup heat exchanger 70, and the other end of the return pipe 72 is connected to another inlet of the three-way valve 71. I have. By adjusting the three-way valve 71, the flow rate of the chilled water passing through the backup heat exchanger 70 and the flow rate of the chilled water not passing through the backup heat exchanger 70 are adjusted, and the temperature of the chilled water returning to the chilled water LNG vaporizer 11 is adjusted. I do.

The second chilled water circulation circuit 60 connects the low temperature part 43 of the chilled water heat storage tank 40 to the inlet of the cooling chilled water coil 31 via a pipe 61, and connects the outlet of the cooling water coil 31 to the high temperature part 44 of the chilled water heat storage tank 40. The connection is made by the road 62. A second three-way valve 63 and a variable flow pump 64 are sequentially interposed in the pipe 61 from the upstream side, and the low-temperature part 43 and the high-temperature part 44 of the cold water storage tank 40 are connected to the two inlets of the second three-way valve 63 , respectively. Have been. A two-way valve 65 is interposed in the conduit 62.

  An exhaust gas supply device 80 cools an exhaust gas of 100 ° C. or higher generated by combustion of natural gas in the gas turbine combined cycle power plant 20 with an exhaust gas cooling device 81 and supplies it to the plant factory 30 to supply carbon dioxide gas. The exhaust gas cooling device 81 circulates a portion of the chilled water cooled by the LNG chilled heat discharged from the variable flow rate pump 64 by controlling the flow rate with the two-way valve 82, and exchanging heat with the exhaust gas to convert the chilled water into high-temperature chilled water. Is returned to the high-temperature portion 44 of FIG.

The control device 90 controls the first chilled water circulation circuit 50 so that the temperature of the low-temperature chilled water flowing out of the chilled water LNG vaporizer 11 becomes a constant low temperature, for example, 8 ° C. Controller 90, to circulate the chilled water at a constant flow rate to the first cold water circulation circuit 50 at a constant flow rate pump 54, to measure the low-temperature cold water temperature T1 flowing from the cold water type LNG vaporizer 11, and the temperature T1 of, for example, 8 ° C. By controlling the first three-way valve 53 so as to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water flowing out of the cold-water heat storage tank 40, the temperature of the cold water flowing into the cold-water LNG vaporizer 11 is controlled. Thus, the temperature T1 of the low-temperature chilled water flowing out of the chilled water type LNG vaporizer 11 can be kept constant (8 ° C.) irrespective of the change in the refrigeration capacity of the LNG vaporizer 11 throughout the day. When the refrigeration capacity of the LNG vaporizer 11 is stable and the temperatures of the low-temperature cold water and the high-temperature cold water stored in the cold water heat storage tank 40 are, for example, 8 ° C. and 20 ° C., the temperature of the cold water flowing into the LNG vaporizer 11 Is 15 ° C., for example.

The controller 90 sets the indoor temperature of the plant factory 30 to the required temperature (for example, 25 ° C.), and the temperature of the high-temperature chilled water that has released LNG cold returned from the cooling chilled water coil 31 to the chilled water storage tank 40 becomes, for example, 20 ° C. Thus, the second chilled water circulation circuit 60 is controlled. The control device 90 measures the temperature T2 in the plant factory 30 and draws the chilled water from the chilled water storage tank 40 by the variable flow rate pump 64 through the cooling chilled water coil 31 so that the temperature T2 becomes, for example, 25 ° C. The flow rate of the cold water returned to the high temperature section 44 of the heat storage tank 40 is controlled by a two-way valve 65. When the temperatures of the low-temperature cold water and the high-temperature cold water stored in the cold-water heat storage tank 40 are, for example, 8 ° C. and 20 ° C., the temperature of the high-temperature cold water that releases the LNG cold returned from the cooling water coil 31 to the cold water heat storage tank 40 Is controlled to be 20 ° C. by controlling the second three-way valve 63 to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water flowing out of the cold water storage tank 40, and to cool with the LNG cold flowing into the cooling water coil 31 for cooling. The temperature of the cooled water is adjusted to, for example, 10 ° C. Accordingly, the indoor temperature of the plant factory 30 can be maintained at the required temperature, even though the cooling load (cooling heat demand) of the plant factory 30 varies throughout the day depending on the presence or absence of solar radiation and the outside air temperature.

  In this way, when the refrigeration capacity of the chilled water LNG vaporizer 11 exceeds the chilled heat demand of the plant factory 30, the control device 90 stores the low-temperature chilled water corresponding to the surplus chilled heat whose refrigeration capacity exceeds the chilled heat demand in the chilled water heat storage tank 40. When the cold demand in the plant factory 30 exceeds the refrigerating capacity in the chilled water LNG vaporizer 11, the cold capacity in which the refrigerating capacity is insufficient with respect to the cold demand is reduced by the low-temperature cold water stored in the cold water storage tank 40. The first chilled water circulation circuit 50 and the second chilled water circulation circuit 60 are controlled so as to be supplied to the cooling chilled water coil 31.

2. Operation and effect of the first embodiment When the constant flow pump 54 of the first chilled water circulation circuit 50 is driven, high-temperature chilled water and low-temperature chilled water are pumped from the chilled water heat storage tank 40 at a rate controlled by the first three-way valve 53. The mixed cold water is returned to the cold water type LNG vaporizer 11. The chilled water LNG vaporizer 11 directly exchanges LNG chilled heat between liquefied natural gas and chilled water to generate natural gas and sends it to the GTCC power plant 20. The low-temperature part 43 is supplied to the low-temperature part 43. At this time, the temperature T1 of the low-temperature chilled water flowing out of the chilled water LNG vaporizer 11 is measured, and the temperature T1 is kept at a constant low temperature regardless of the change in the refrigeration capacity of the chilled water LNG vaporizer 11 throughout the day. Is controlled by the first three-way valve 53 . In the stable operation state of the chilled water supply system 1a that stores and uses the LNG chilled heat, the temperature of the chilled water flowing into the chilled water LNG vaporizer 11 is about 15 ° C.

When the variable flow pump 64 of the second chilled water circulation circuit 60 is driven, low-temperature chilled water (8 ° C.) and high-temperature chilled water (20 ° C.) are pumped from the chilled water heat storage tank 40 at a rate controlled by the second three-way valve 63. To produce cold water (10 ° C.) cooled with LNG cold. The chilled water cooled by the LNG chill is sent to the cooling chill water coil 31 to release the LNG chill to control the indoor temperature of the plant factory 30 to the required temperature (25 ° C.), and the chilled water heat storage tank 40 through the two-way valve 65. Is returned to the high-temperature section 44 of FIG. At this time, the flow rate of the cold water is controlled by the two-way valve 65 so that the temperature T2 in the plant factory 30 becomes the required temperature. The variable flow rate pump is controlled so as to have a discharge rate that ensures the flow rate of the cold water cooled by the LNG cold heat. The low-temperature chilled water pumped out of the chilled water heat storage tank 40 by controlling the second three-way valve 63 so that the temperature of the chilled water cooled by the LNG chill supplied from the chilled water heat storage tank 40 to the cooling chill water coil 31 is set to 10 ° C. And adjust the ratio of hot and cold water.

  When the plant factory 30 is of a complete control type, the light source is illuminated to illuminate to create a light period, and is turned off to create a dark period. As shown in FIG. 2, in the light period from 0 o'clock to 9 o'clock and from 17 o'clock to 24 o'clock, cooling is needed to cool the heat generated by the light source to be turned on, so that cooling demand is generated. However, since the lights are turned off in the dark period from 9:00 to 17:00, there is no need for cooling power by lighting. Since the usage of natural gas is greater during the day than at night, the amount of liquefied natural gas vaporized by the NG carburetor 11 at the LNG satellite base 10 increases in conjunction with the amount of natural gas used, and The refrigerating capacity of the NG vaporizer 11 fluctuates between 0:00 and 24:00 as shown in FIG.

  The controller 90 operates the constant flow pump 54 from 0:00 to 24:00 to send low-temperature chilled water having cold generated according to the refrigeration capacity of the chilled water LNG vaporizer 11 to the low-temperature portion 43 of the chilled water heat storage tank 40, Between 0 o'clock to 9 o'clock and 17 o'clock to 24 o'clock, the variable flow pump 64 is operated to supply the cold water cooled by the LNG cold from the cold water storage tank 40 to the cooling cold water coil 31 at a flow rate according to the cold demand in the plant factory 30. The high-temperature chilled water that has been supplied and that has released LNG chill in the cooling chilled water coil 31 is returned to the high-temperature portion 44 of the chilled water heat storage tank 40.

  In this way, the control device 90 has the LNG refrigeration for the surplus refrigeration whose refrigeration capacity exceeds the refrigeration demand from 9:00 to 17:00 when the refrigeration capacity of the chilled water LNG vaporizer 11 exceeds the refrigeration demand in the plant factory 30. The low-temperature chilled water is stored in the low-temperature portion 43 of the chilled water heat storage tank 40, and the refrigeration capacity is low during the period from 0:00 to 9:00 and from 17:00 to 24:00 when the refrigeration demand in the plant factory 30 exceeds the refrigeration capacity of the chilled water LNG vaporizer 11. Insufficient chilled heat that is insufficient for demand is supplied to the cooling chilled water coil 31 of the plant factory 30 with the low-temperature chilled water stored in the low-temperature section 43 of the chilled water heat storage tank 40.

  When the balance between the refrigeration capacity and the demand for cold heat is more unexpected than expected, and it is necessary to increase the temperature of the cold water to be heat-exchanged in the cold water LNG vaporizer 11, the three-way valve 71 is opened at an opening degree according to the required degree and the cold water LNG is opened. A part of the cold water returning to the vaporizer 11 is heated by the backup heat exchanger 70. Thereby, the chilled water is heated by the cooling water or seawater of about 20 ° C. supplied from the circulation circuit 24 of the cooling device 21 of the gas turbine combined cycle power plant 20, and the temperature of the chilled water supplied to the chilled water type LNG vaporizer 11 is increased. be able to. The cooling water or seawater is cooled to about 15 ° C. and returns to the circulation circuit 24.

  In the gas turbine combined cycle power plant 20, the exhaust gas discharged after driving the gas turbine and heating the exhaust heat recovery boiler is supplied as carbon dioxide to the plant factory 30 as needed. The exhaust gas supply device 80 cools the discharged exhaust gas of 100 ° C. or higher to about 20 ° C. by the exhaust gas cooling device 81 and supplies the exhaust gas to the plant factory 30. Low-temperature cold water is supplied to the exhaust gas cooling device 81 from the low-temperature portion 43 of the cold water heat storage tank 40, exchanges heat with the exhaust gas, raises the temperature to about 20 ° C., and returns to the high temperature portion 44 of the cold water heat storage tank 40. Thereby, the natural gas generated by the liquefied natural gas releasing the LNG cold energy in the LNG vaporizer 11 is burned in the industrial equipment, and the exhaust gas discharged after the natural gas is cooled by the LNG cold energy is supplied to the plant factory as carbon dioxide gas. Can be.

  Since the consumption of natural gas (NG) in the GTCC power plant 20 changes according to the amount of power generation, the supply capacity (refrigeration capacity) of LNG chilled heat in the chilled water LNG vaporizer 11 changes throughout the day. The cooling load (cooling heat demand) of the plant factory 30 varies throughout the day depending on the presence or absence of solar radiation and the outside air temperature. As a result, a difference occurs between the change trend of the refrigeration capacity in the LNG vaporizer 11 and the change trend of the cold heat demand in the plant factory 30 throughout the day. According to the first embodiment, irrespective of the difference between the change trend of the refrigeration capacity in the LNG vaporizer 11 and the change trend of the cold heat demand in the plant factory 30 throughout the day, the LNG vaporizer 11 has the cold generated in the vaporizer 11. The plant factory 30 can be cooled only by the low-temperature cold water, and the cold energy can be used without waste, and the energy saving effect is large.

In the first embodiment, since the chilled water LNG vaporizer 11 is used, low-temperature chilled water having LNG chill generated by the chilled water LNG vaporizer 11 is directly flowed into the low-temperature portion 43 of the chilled water heat storage layer 30 and stored. It can be supplied to the cooling water coil 31 of the plant factory 30 as cold water cooled by LNG cold. Thereby, the cold water cooled by the LNG cold with a simple configuration can be efficiently used for cooling the plant factory 30.
Furthermore, if the cold water heat storage tank 40 is a temperature stratified cold water heat storage tank 41, even if the cold water heat storage tank 40 is installed on the ground between the LNG satellite base 10 and the plant factory 30, it has high heat storage efficiency and LNG cold heat. Cold cold water can be stored. Furthermore, since there is no need to provide, for example, an underground double slab space for accommodating the cold water heat storage tank 40, the plant factory 30 can be constructed at low cost, and the initial cost of constructing a plant production system that uses and stores LNG cold heat is used. Can be reduced.

As shown in FIG. 3, the temperature stratified chilled water heat storage tank 41 has a low-temperature section 43 for storing low-temperature cold water at 8 ° C. formed inside a tank 42 at the lower side, and a high-temperature section for storing high-temperature cold water at 20 ° C. The part 44 is formed on the upper side. On one side of the tank 42, a low-temperature cold water channel 45 surrounded by a wall 45a whose upper end is in close contact with the top surface and whose lower end is slightly separated from the bottom surface is formed, and on the other side, the lower end is in close contact with the bottom surface, A high-temperature cold water channel 46 is formed, which is surrounded by a wall 46a whose upper end is slightly separated from the top surface. The low-temperature chilled water channel 45 is filled with low-temperature chilled water at the same level as the upper surface of the high-temperature portion 44, and the high-temperature chilled water channel 46 is filled with high-temperature chilled water of the high-temperature portion 44 to the bottom surface. A vent 47 is provided on the top surface of the tank 42. Two inflow ports of the second three-way valve 63 are connected to the low-temperature cold water path 45 and the high-temperature cold water path 46, and further, two inflow ports of the first three-way valve 53 are connected. The chilled water LNG vaporizer 11 is connected to the lower part of the low-temperature chilled water channel 45 via a pipe 51, and the outlet of the cooling chilled water coil 31 is connected to the upper part of the high-temperature chilled water channel 46 via a pipe 62.

  In the first embodiment, the refrigeration capacity of the chilled water type LNG vaporizer 11 is supplied to the plant factory 40 as the chilled water cooled by the LNG chilled heat from the chilled water heat storage tank 40 because the chilled water that is insufficient for the refrigeration demand at the plant factory 30 is supplied. It is not necessary that the maximum amount of the cold heat demand of the plant factory 30 is limited to the magnitude of the refrigeration capacity when the cold demand in the plant factory 30 exceeds the refrigeration capacity of the LNG vaporizer 11, and the plant factory 30 is enlarged. Can be.

3. Configuration of Second Embodiment The plant production system 1b according to the second embodiment that stores and uses cold energy of LNG uses a desalination plant 25 as an industrial facility, a solar plant as a plant plant 30, and a heating water plant for a plant plant. Since it is the same as the first embodiment except that the coil 86 is provided, only the differences will be described, and the same reference numerals will be given to the same components as those in the first embodiment, and description thereof will be omitted.

  In the second embodiment, as shown in FIG. 4, a desalination plant, for example, a known multi-stage flash method desalination plant 25 is used as industrial equipment. The multi-stage flash method desalination plant 25 depressurizes the evaporator with a negative pressure generated by steam flowing through the ejector at a high speed, and steam generated by boiling and evaporating seawater heated by the steam with the heater using the evaporator with a negative pressure. To produce fresh water. The steam that has passed through the ejector exchanges heat with seawater in the condenser 27 of the cooling device 26 to be condensed and returned to the exhaust heat recovery boiler. The cooling device 26 includes a circulation circuit 28 that pumps seawater from the sea with a pump and returns the seawater to the sea via the condensing unit 27. The desalination plant 25 is often provided in parallel with a gas turbine power generator driven by a gas turbine driven by the combustion of natural gas supplied from the chilled water LNG vaporizer 11, and steam flowing at high speed through the ejector is In addition, steam generated by heat recovery from an exhaust gas discharged from a gas turbine by an exhaust heat recovery boiler is used.

  A heat pump 85 is provided between the condenser 27 of the cooling device 26 provided in the desalination plant 25 and the heating hot water coil 86 provided in the plant factory 30. The heat pump 85 absorbs heat from a part of the seawater heated in the condensing section 27, supplies hot heat to the heat medium circulating in the heating hot water coil 86, and heats the interior of the plant factory 30 as necessary.

4. Operation and effects of the second embodiment When the plant factory 30 is of the solar light type, the cold demand in the plant factory 30 varies according to the presence or absence of solar radiation and the outside air temperature, and the outside air temperature rises from dawn to sunset. Therefore, the cold heat demand in the plant factory 30 of the solar light type fluctuates depending on the time as shown in FIG. 5, and is 0 between 0:00 and 8:00 and between 18:00 and 24:00, and is 8:00. It increases rapidly between 18:00 and 18:00. The fluctuation of the refrigeration capacity of the chilled water NG vaporizer 11 is the same as that of the completely controlled plant factory 30.

  The control device 90 operates the constant flow pump 54 from 0:00 to 24:00 to send low-temperature chilled water having chill generated according to the refrigeration capacity of the chilled water LNG vaporizer 11 to the low-temperature portion 43 of the chilled water heat storage tank 40, Between 8:00 and 18:00, the variable flow pump 64 is operated to supply the cold water cooled by LNG cold from the cold water storage tank 40 to the cooling cold water coil 31 at a flow rate corresponding to the cold demand in the plant factory 30. The high-temperature cold water that has released the LNG cold heat by the coil 31 is returned to the high-temperature portion 44 of the cold water heat storage tank 40.

  In this manner, the control device 90 sets the refrigeration capacity to be lower than 0:00 to 8:00 and from 18:00 to 24:00 when the refrigeration capacity of the chilled water type LNG vaporizer 11 exceeds the demand for refrigeration in the plant plant 30 using sunlight. The low-temperature chilled water having the LNG chill of the surplus chill exceeding the demand is stored in the low-temperature portion 43 of the chilled water storage tank 40, and the chill demand in the plant factory 30 exceeds the refrigerating capacity of the chilled water LNG vaporizer 11 from 8:00 to 18:00. The first chilled water circulation circuit 50 and the second chilled water so that the chilled water whose refrigeration capacity is insufficient with respect to the chilled heat demand is supplied from the low temperature part 43 of the chilled water storage tank 40 to the chilled water coil 31 of the plant factory 30 with the low temperature chilled water. The circuit 60 is controlled.

  When heating the plant factory 30 using sunlight, the heat pump 85 is started. As a result, the seawater of about 20 ° C. is supplied from the circulation circuit 28 of the cooling device 26 to the heat pump 85 and exchanges heat with the heat medium to release heat, and then the temperature is reduced to about 15 ° C. and returned to the circulation circuit 28. . The heat medium heated by the heat pump 85 and heated to about 50 ° C. is supplied to the heating hot water coil 86 of the plant factory 30 to release the heat, and then the temperature is reduced to about 45 ° C. and returned to the heat pump 85. .

  In the first embodiment and the second embodiment, the gas turbine combined cycle power plant 20 and the desalination plant 25 as the industrial facilities may be interchanged. Even in the case of replacement, the condensing units 22 and 25 provided in the industrial equipment are cooled by cooling water or seawater.

  The second embodiment has the same effects as the first embodiment. Furthermore, cooling water or seawater that cools the condensing section 27 of the industrial equipment that condenses steam generated in the exhaust heat recovery boiler into water with exhaust gas generated by burning natural gas generated in the chilled water LNG vaporizer 11. Since the heat is absorbed by the heat pump 85 and is released by the heating hot water coil 86 provided in the plant factory 30 to heat the interior of the plant factory 30 as necessary, the running cost of the plant factory 30 can be reduced. it can.

5. Configuration of Third Embodiment As shown in FIG. 6, the plant production system 1c according to the third embodiment that stores and uses LNG cold heat includes a vaporizer that vaporizes liquefied natural gas. This is an LNG vaporizer 15 that exchanges heat with an antifreeze heat medium, and is the same as the first embodiment except that a heat exchanger 16 is provided between the LNG vaporizer 15 and the cold water storage tank 40. Differences will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The LNG satellite base 10 includes an LNG vaporizer 15 that vaporizes the liquefied natural gas supplied from the LNG tank 12 with an antifreeze heat medium to produce natural gas. A heat exchanger 16 is provided between the LNG vaporizer 15 and the cold water heat storage tank 40, and the LNG vaporizer 15 and the heat exchanger 16 are connected by a first antifreeze heat medium circulating circuit 75 in which the antifreeze heat medium circulates. It is connected.

  In the first antifreeze heat medium circulation circuit 75, a constant flow rate pump 79 is interposed between the heat medium outlet side of the LNG vaporizer 15 and the heat medium inlet side of the heat exchanger 16, so that the constant flow rate of the antifreeze heat medium is maintained. In the first antifreeze heat medium circulation circuit 75. Thereby, the antifreeze heat medium reduced to, for example, −5 ° C. by the LNG cold generated by the vaporization of the liquefied natural gas in the LNG vaporizer 15 is supplied to the heat exchanger 16 and returned from the cold water storage tank 40 to the heat exchanger 16. The temperature is raised to, for example, 2 ° C. by heat exchange with the cold water. The low-temperature chilled water whose temperature has been reduced to, for example, 4 ° C. by heat exchange with the antifreeze heat medium in the heat exchanger 15 is supplied to the low-temperature section 43 of the chilled water heat storage tank 40.

  The third chilled water circulation circuit 55 of the third embodiment is different from the chilled water LNG vaporizer 11 and the chilled water heat storage tank 40 in that the first chilled water circulation circuit 50 of the first embodiment is provided with heat exchange. It is provided between the vessel 16 and the cold water heat storage tank 40. In the third cold water circulation circuit 55, a backup heat exchanger 70 and a three-way valve 71 are sequentially interposed between the constant flow pump 54 and the cold water inlet side of the heat exchanger 16 from the upstream side. One end of the return pipe 72 is connected to the heat exchanger 70 for use. The other end of the return line 72 is connected to another inflow port of the three-way valve 71. The backup heat exchanger 70, the three-way valve 71, and the return line 72 are not provided in the third chilled water circulation circuit 55, and are connected to the heat medium outlet side of the heat exchanger 16 of the first antifreeze heat medium circulation circuit 75. It may be provided between the LNG vaporizer 15 and the heat medium inlet side.

6. Operation and Effect of Third Embodiment The control device 90 controls the third chilled water circulation circuit 55 so that the temperature of the low-temperature chilled water flowing out of the heat exchanger 16 becomes a constant low temperature, for example, 4 ° C. The control device 90 causes the constant flow pump 54 to circulate a constant flow of chilled water in the third chilled water circulation circuit 55 and measures the temperature T1 of the low-temperature chilled water flowing out of the heat exchanger 16 so that the temperature T1 becomes, for example, 4 ° C. The temperature of the cold water flowing into the heat exchanger 16 is controlled by controlling the first three-way valve 53 to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water flowing out of the cold water heat storage tank 40. Thus, the temperature T1 of the low-temperature chilled water flowing out of the heat exchanger 16 to which the LNG cryogenic heat has been transferred from the LNG vaporizer 15 is kept constant (4 ° C.) regardless of the change in the refrigeration capacity of the LNG vaporizer 15 throughout the day. Can be maintained. When the refrigerating capacity of the LNG vaporizer 15 is in a stable state and the temperatures of the low-temperature cold water and the high-temperature cold water stored in the cold water heat storage tank 40 are, for example, 4 ° C. and 18 ° C., the temperature of the cold water flowing into the heat exchanger 16 Becomes 11 ° C., for example.

The controller 90 sets the indoor temperature of the plant factory 30 to the required temperature (for example, 25 ° C.), and the temperature of the high-temperature chilled water that has released LNG cold returned from the cooling chilled water coil 31 to the chilled water storage tank 40 becomes, for example, 18 ° C. The fourth cold water circulation circuit 66 is controlled as described above. The control device 90 measures the temperature T2 in the plant factory 30 and draws the chilled water from the chilled water storage tank 40 by the variable flow rate pump 64 through the cooling chilled water coil 31 so that the temperature T2 becomes, for example, 25 ° C. The flow rate of the cold water returned to the high temperature section 44 of the heat storage tank 40 is controlled by a two-way valve 65. When the temperatures of the low-temperature cold water and the high-temperature cold water stored in the cold-water storage tank 40 are, for example, 4 ° C. and 18 ° C., the temperature of the high-temperature cold water that releases the LNG cold returned from the cooling water coil 31 to the cold-water storage tank 40 To 18 ° C., the second three-way valve 63 is controlled to adjust the mixing ratio of the high-temperature cold water and the low-temperature cold water flowing out of the cold water storage tank 40, and is cooled by the LNG cold flowing into the cooling cold water coil 31. The temperature of the cooled water is adjusted to, for example, 6 ° C. Accordingly, the indoor temperature of the plant factory 30 can be maintained at the required temperature, even though the cooling load (cooling heat demand) of the plant factory 30 varies throughout the day depending on the presence or absence of solar radiation and the outside air temperature.

  In this way, when the refrigeration capacity of the LNG vaporizer 15 exceeds the cold demand in the plant factory 30, the control device 90 stores the low-temperature chilled water corresponding to the surplus chill that exceeds the cold demand in the cold water storage tank 40, When the cold demand in the plant factory 30 exceeds the refrigerating capacity in the LNG vaporizer 15, the cooling capacity of the plant factory 30 is reduced by the low-temperature cold water stored in the cold water heat storage tank 40 with the insufficient cold heat in which the refrigerating capacity is insufficient for the cold demand. The third chilled water circulating circuit 55 and the fourth chilled water circulating circuit 66 are controlled so as to be supplied to the first cooling water 31.

  By interposing the heat exchanger 16 between the LNG vaporizer 15 and the cold water heat storage tank 40, it becomes possible to use the antifreeze heat exchange medium in the LNG vaporizer 15 and to freeze in the heat exchanger 16. LNG cold heat can be exchanged between the antifreeze heat medium and the cold water at, for example, 11 ° C. to convert the cold water into low-temperature cold water at 4 ° C., and the temperature difference between the low-temperature cold water and the high-temperature cold water to 12 ° in the first embodiment. Can be extended from ℃ to 14 ℃. By increasing the temperature difference between the low-temperature cold water stored in the low-temperature section 43 and the high-temperature cold water stored in the high-temperature section 44, the volume of the cold water storage tank 40 can be reduced if the amount of cold stored is the same. . Furthermore, since the temperature of the low-temperature chilled water can be lowered to 4 ° C., the energy efficiency of cooling in the chilled water utilization facility can be increased.

  In the third embodiment, as in the second embodiment, the industrial equipment may be a desalination plant 25, the plant factory 30 may be of a solar heat utilization type, and the plant factory 30 may be provided with a heating hot water coil 86. Other configurations, operations, and effects of the chilled water supply system 1c according to the third embodiment for storing and using LNG cold heat are the same as those of the first embodiment, and thus description thereof is omitted.

7. Configuration of Reference Example
As shown in FIG. 7, the plant production system 1d according to the reference example that stores and uses the LNG cold heat exchanges the cold water LNG vaporizer 11 between the liquefied natural gas and the antifreeze heat medium by using the LNG cold heat. This is the same as the first embodiment except that the LNG vaporizer 15 is used, the cold water heat storage tank 40 is the ice heat storage tank 91, and the first cold water circulation circuit is the second antifreeze heat medium circulation circuit 76. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The fifth chilled water circulation circuit 67 is the same as the fourth chilled water circulation circuit 66 of the third embodiment.

  The LNG satellite base 10 includes an LNG vaporizer 11 which vaporizes liquefied natural gas with an antifreezing heat medium to produce natural gas. Between the LNG vaporizer 15 and the ice heat storage tank 42, a second antifreeze heat medium circulation circuit 76 in which the antifreeze heat medium is circulated by the constant flow pump 79 is provided. The second antifreeze heat medium circulation circuit 76 includes a heat exchange coil that exchanges heat between the liquefied natural gas and the antifreeze heat medium in the LNG vaporizer 15 to cool the antifreeze heat medium to, for example, −20 ° C. A heat exchange coil for exchanging heat between the antifreeze heat medium and the cold water of the ice making unit 97 in the ice heat storage tank 41 to freeze the cold water of the ice making unit 97 and raise the temperature of the antifreeze heat medium to, for example, -13 ° C. 77 are provided.

As shown in FIG. 8, the ice heat storage tank 91 has a low-temperature section 93 for storing low-temperature cold water at 4 ° C. formed at the lower end thereof inside a tank 92, and a high-temperature section 94 for storing high-temperature cold water at 18 ° C. for example. It is formed at the upper end. An ice making unit 97 is formed at the center in the up-down direction of the tank 92, and the heat exchange coil 77 of the second antifreezing heat medium circulation circuit 76 is arranged in the ice making unit 97. On one side of the tank 92, a low-temperature chilled water channel 95 surrounded by a wall 95a whose upper end is in close contact with the top surface and whose lower end is slightly separated from the bottom surface is formed, and on the other side, the lower end is in close contact with the bottom surface, A high-temperature cold water channel 96 is formed which is surrounded by a wall 96a whose upper end is slightly separated from the top surface. The low-temperature chilled water channel 95 is filled with low-temperature chilled water at the same level as the upper surface of the high-temperature portion 94, and the high-temperature chilled water channel 94 is filled with the high-temperature chilled water of the high-temperature portion 94 up to the bottom surface. A vent 98 is provided on the top surface of the tank 92. The pipe 61 of the fifth chilled water circulation circuit 67 is connected to the low-temperature chilled water channel 95, and the second three-way valve 63 and the variable flow pump 64 are sequentially interposed in the pipe 61 from the upstream side. A high-temperature cold water channel 96 is connected to another inflow port of the second three-way valve 63 . The outlet of the cooling water coil 31 for cooling in the plant factory 30 is connected to the pipe line 62 connected to the high temperature cooling water path 96 via a two-way valve 65.

  In the second antifreeze heat medium circulation circuit 76, a backup heat exchanger 70 and a three-way valve 71 are sequentially provided from the upstream side between the heat medium outlet side of the heat exchange coil 77 and the heat medium inlet side of the LNG vaporizer 15. One end of the return pipe 72 is connected between the heat medium outlet side of the heat exchange coil 77 and the backup heat exchanger 70. The other end of the return line 72 is connected to another inflow port of the three-way valve 71. In the second antifreeze heat medium circulation circuit 76, a constant flow pump 79 is interposed between the heat medium outlet side of the LNG vaporizer 15 and the heat medium inlet side of the heat exchange coil 77.

8. Operation of Reference Example When the constant flow pump 79 of the second antifreeze heat medium circulation circuit 76 is driven, ice is made by the heat exchange coil 77, and the antifreeze heat medium heated to, for example, −13 ° C. is supplied to the LNG vaporizer 15. Is returned to. The LNG vaporizer 15 heat-exchanges LNG cold heat between the liquefied natural gas and the antifreeze heat medium to generate natural gas and sends it to the GTCC power plant 20, and also makes the antifreeze heat medium having LNG cold heat into ice. The heat is supplied to the heat exchange coil 77 of the section 97.

  Thus, when the refrigeration capacity of the LNG vaporizer 15 is in a stable state and the temperatures of the low-temperature cold water and the high-temperature cold water stored in the cold water heat storage tank 40 are, for example, 4 ° C. and 18 ° C., the gas flows into the LNG vaporizer 15. The temperature of the antifreeze heat medium is, for example, −13 ° C.

  Then, when the refrigerating capacity of the LNG vaporizer 15 exceeds the cold demand in the plant factory 30, the control device 90 freezes the cold water of the ice making unit 97 by the LNG cold heat corresponding to the surplus cold heat in which the refrigerating capacity exceeds the cold demand, and When the refrigeration demand at 30 exceeds the refrigeration capacity at the LNG vaporizer 15, the second antifreeze heat medium circulation circuit 76 and The fifth chilled water circulation circuit 67 is controlled.

  By circulating an antifreeze heat medium between the LNG vaporizer 15 and the ice heat storage tank 91, a large amount of LNG cold heat can be stored with the latent heat of freezing (heat of fusion of 80 Kcal / Kg). If the amount is the same, the volume of the heat storage tank can be significantly reduced. Furthermore, since the temperature of the low-temperature chilled water can be lowered to 4 ° C., the energy efficiency of cooling in the chilled water utilization facility can be increased.

In the reference example , as in the second embodiment, the industrial equipment may be a desalination plant 25, the plant factory 30 may be of a solar heat utilization type, and the plant factory 30 may be provided with a heating hot water coil 86. Other configurations, operations, and effects of the cold water supply system 1d according to the reference example for storing and utilizing LNG cold heat are the same as those of the first embodiment or the third embodiment, and thus description thereof is omitted.

  In the above embodiment, the cold water utilization facility is a plant factory of the complete control type or the sunlight utilization type. However, the present invention is not limited to this. When the chilled water utilization facility is a data center or a supercomputer analysis center, the chilled water supply system supplies chilled water cooled by LNG chilled heat for cooling and CPU cooling, and is adjacent to a GTCC power plant that is an industrial facility. When the chilled water utilization facility is a power-consuming high-precision environmental factory (for example, a semiconductor factory), the chilled water supply system supplies chilled water cooled by LNG cryogenic heat for cooling and process cooling, and the LNG satellite base and private power generation. Make it a part of the energy center composed of the system. If the chilled water utilization facility is a large-scale airport facility, this chilled water supply system supplies chilled water cooled by LNG chilled heat for cooling the facility, and is part of an energy center consisting of an LNG satellite base and an in-house power generation system. To If the chilled water utilization facility is an urbanized redevelopment area, this chilled water supply system supplies chilled water cooled by LNG chilled heat for district cooling, and is part of an energy center consisting of an LNG satellite base and an in-house power generation system. To When the chilled water utilization facility is a facility requiring a low-temperature indoor environment such as a refrigerated warehouse or a brewery, the chilled water supply system supplies chilled water cooled by LNG cryogenic heat for cooling the facility, and the GTCC power generation as an industrial facility. Installed next to the plant.

1a to 1d: Cold water supply system for storing and using LNG cold heat, 10: LNG satellite base, 11: Cold water type LNG vaporizer, 12: LNG tank, 15: LNG vaporizer, 16 heat exchanger, 20: Gas turbine Combined cycle power plant (industrial equipment), 25: desalination plant (industrial equipment), 21, 26: cooling device, 22, 27: condenser, 23: cooling tower, 24, 28: circulation circuit, 30: plant factory, 31: cooling water coil for cooling, 40: cold water heat storage tank, 41: temperature stratification type cold water heat storage tank, 43: low temperature part, 44: high temperature part, 50: first cold water circulation circuit, 53: first three-way valve, 63: first 2 three-way valve , 54: constant flow pump, 55: third chilled water circulation circuit, 60: second chilled water circulation circuit, 64: variable flow pump, 65, 82: two-way valve, 66: fourth chilled water circulation circuit, 67: Fifth cold water circulation Ring circuit, 70: backup heat exchanger, 71: three-way valve, 72: return line, 75: first antifreeze heat medium circuit, 76: second antifreeze heat medium circuit, 79: constant flow pump, 80: exhaust gas supply device, 81: exhaust gas cooling device, 85: heat pump, 86: heating hot water coil, 90: control device, 91: ice heat storage tank, 93: low temperature section, 94: high temperature section, 97: ice making section.

Claims (4)

LNG cold generated when liquefied natural gas is vaporized is directly heat-exchanged between the liquefied natural gas and chilled water to produce natural gas used in industrial equipment by a chilled water LNG vaporizer that uses the chilled water as low-temperature chilled water. LNG satellite base
A chilled water utilization facility that is disposed in proximity to the LNG satellite base and includes a chilled water utilization unit that utilizes the low-temperature chilled water cooled by the LNG cryogenic heat;
A low-temperature section that is provided between the chilled water LNG vaporizer and the chilled water utilization facility and stores the low-temperature chilled water supplied from the chilled water LNG vaporizer and a high-temperature section that stores the high-temperature chilled water returned from the chilled water utilization section. A temperature stratified cold water heat storage tank in which a part is formed ,
A first three-way valve and a constant flow pump are sequentially interposed in a pipe connecting the temperature stratified chilled water heat storage tank to the chilled water inlet of the chilled water LNG vaporizer, and the two inlets of the first three-way valve are The cold water is returned to the cold water LNG vaporizer connected to the high temperature part and the low temperature part of the temperature stratified cold water heat storage tank, and the low temperature cold water is discharged from the cold water LNG vaporizer to the temperature stratified cold water heat storage tank. A first chilled water circulation circuit for supplying to the low temperature section ;
A second three-way valve and a variable flow pump are sequentially interposed between the temperature-stratified cold water storage tank and the inlet of the cold water utilization section, and two inlets of the second three-way valve are connected to the temperature-stratified cold water storage tank. The low-temperature chilled water and the high-temperature chilled water, which are connected to the low-temperature portion and the high-temperature portion, respectively, and whose mixing ratios are adjusted by the second three-way valve, are supplied to the chilled water utilization portion to release the LNG chilled heat, and A second chilled water circulation circuit that returns the high-temperature chilled water from the outlet of the chilled water utilization unit to the high-temperature portion of the temperature-stratified chilled water storage tank through a two-way valve that controls the flow rate, as cold water,
A cooling device that cools the condensing section provided in the industrial facility with cooling water or seawater,
A part of the cooling water or seawater, which is provided between the constant flow pump and the chilled water LNG vaporizer in the conduit and exchanges heat in the condensing section and is heated, is supplied to the chilled water LNG. A backup heat exchanger that backs up the cold water and raises the temperature back to the vaporizer;
Mixing the high-temperature chilled water and the low-temperature chilled water flowing out of the temperature-stratified chilled-water heat storage tank by controlling the first three-way valve by circulating the chilled water at a constant flow rate with the constant-flow pump and controlling the first three-way valve. The ratio is adjusted to control the temperature of the low-temperature chilled water flowing out of the chilled water LNG vaporizer and supplied to the low-temperature portion of the temperature-stratified chilled water heat storage tank, and controlling the second three-way valve to control the temperature. While adjusting the mixing ratio of the high-temperature chilled water and the low-temperature chilled water pumped by the variable flow rate pump from the temperature stratified chilled water heat storage tank, the flow rate of the high-temperature chilled water returned to the high-temperature portion through the chilled water utilization unit is adjusted. The two-way valve controls the temperature of the high-temperature chilled water returned from the chilled water utilization section to the high-temperature section of the temperature-stratified chilled water heat storage tank, and the refrigeration capacity of the chilled water LNG vaporizer increases the chilled water utilization. In the facility That when more than cold demand, the refrigerating capacity storing the said cold cold water excess cold fraction exceeds the cold demand to the temperature stratification formula cold heat storage tank, cold heat demand in the chilled water LNG vaporizers in the cold water utilization facility When the refrigeration capacity exceeds the refrigeration capacity, the first chilled water circulation is configured to supply insufficient chilled heat that is insufficient for the chilled heat demand to the chilled water utilization unit with the low-temperature chilled water stored in the temperature-stratified chilled water heat storage tank. A control device for controlling a circuit and the second chilled water circulation circuit;
A chilled water supply system that stores and uses LNG cryogenic heat, comprising An LNG satellite base for producing natural gas used in industrial equipment by an LNG vaporizer for exchanging LNG cold generated when liquefied natural gas is vaporized between the liquefied natural gas and the antifreeze heat medium;
A chilled water utilization facility that is disposed in proximity to the LNG satellite base and includes a chilled water utilization unit that utilizes low-temperature chilled water cooled by the LNG cryogenic heat;
A temperature stratified chilled water heat storage tank provided between the LNG vaporizer and the chilled water utilization facility, wherein a low temperature section for storing the low temperature chilled water and a high temperature section for storing the high temperature chilled water returned from the chilled water utilization section are formed; ,
A heat exchanger provided between the LNG vaporizer and the temperature-stratified cold water storage tank;
Circulating the antifreeze heat medium between the LNG vaporizer and the heat exchanger, and exchanging LNG cold generated by the LNG vaporizer between the antifreeze heat medium and cold water in the heat exchanger. A first antifreeze heat medium circulation circuit that returns the antifreeze heat medium that has released the LNG cold heat to the LNG vaporizer as the low-temperature chilled water;
A first three-way valve and a constant flow pump are sequentially interposed in a pipe connecting the temperature-stratified cold water storage tank to the cold water inlet of the heat exchanger, and two inlets of the first three-way valve are connected to the temperature-stratified type. The cold water storage tank is connected to the high temperature section and the low temperature section, respectively, to return the cold water to the heat exchanger, and to supply the low temperature cold water from the heat exchanger to the low temperature section of the temperature stratified cold water storage tank . 3 chilled water circulation circuit,
A second three-way valve and a variable flow pump are sequentially interposed between the temperature-stratified cold water storage tank and the inlet of the cold water utilization section, and two inlets of the second three-way valve are connected to the temperature-stratified cold water storage tank. The low-temperature chilled water and the high-temperature chilled water which are respectively connected to the low-temperature portion and the high-temperature portion, and the mixing ratio of which is adjusted by the second three-way valve, are supplied to the chilled / water utilization portion to discharge the LNG chilled heat. A fourth chilled water circulation circuit that returns the high-temperature chilled water from the outlet of the chilled water utilization unit to the high-temperature portion of the temperature-stratified chilled water storage tank through a two-way valve that controls the flow rate, as the high-temperature chilled water ,
A cooling device that cools the condensing section provided in the industrial facility with cooling water or seawater,
A part of the cooling water or the seawater, which is provided between the constant flow pump and the heat exchanger in the conduit and exchanges heat in the condensing part and is heated, is supplied and returns to the heat exchanger. A backup heat exchanger that backs up the cold water and raises the temperature,
Mixing the high-temperature chilled water and the low-temperature chilled water flowing out of the temperature-stratified chilled-water heat storage tank by controlling the first three-way valve by circulating the chilled water at a constant flow rate through the third chilled water circulation circuit with the constant flow pump. Controlling the temperature of the low-temperature chilled water flowing out of the heat exchanger and supplied to the low-temperature portion of the temperature-stratified chilled water heat storage tank, and controlling the second three-way valve to control the temperature stratification. The mixing ratio of the high-temperature cold water and the low-temperature cold water pumped by the variable flow rate pump from the chilled water heat storage tank is adjusted, and the flow rate of the high-temperature cold water returned to the high-temperature section through the cold water utilization section is adjusted to the second value. And controlling the temperature of the high-temperature chilled water returned from the chilled water utilization section to the high-temperature section of the temperature stratified chilled water heat storage tank, so that the refrigeration capacity of the LNG vaporizer is reduced by the demand for chilled heat in the chilled water utilization facility. Over Rutoki, the refrigerating capacity storing the said cold cold water excess cold fraction exceeds the cold demand to the temperature stratification formula cold water storage tank, when the cold heat demand in the cold water utilization facility exceeds refrigerating capacity in the LNG vaporizer, The third chilled water circulation circuit and the fourth chilled water circulation so that the chilled water whose refrigeration capacity is insufficient with respect to the chilled heat demand is supplied to the chilled water utilization unit with the low-temperature chilled water stored in the temperature-stratified chilled water heat storage tank. A control device for controlling the circuit;
A chilled water supply system comprising: 2. A heat pump that absorbs heat from a part of the cooling water or the seawater of the cooling device heated in the condensing unit and supplies hot heat to a heating hot water coil provided in the cold water utilization facility. 3. A chilled water supply system for storing and utilizing the LNG chilled heat according to claim 2 . The cold water utilization facility is a plant factory,
The cold water cooled by the LNG cold heat is supplied from the temperature stratified cold water heat storage tank, and the exhaust gas cooling device cools the exhaust gas generated by the combustion of the natural gas in the industrial facility with the cold water cooled by the LNG cold heat. The cold water supply system according to any one of claims 1 to 3 , further comprising: an exhaust gas supply device that cools the exhaust gas with the exhaust gas cooling device and supplies the exhaust gas to the plant factory. .

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