Composite air conditioning system of LNG receiving station

Abstract

The utility model discloses a composite air-conditioning system of an LNG receiving station, which comprises a first evaporator and a superheater, the first evaporator is connected with the superheater, the superheater is connected with a seawater side circulating water pump and a cold energy circulating water pump, and air-conditioning water is discharged into a plate heat exchanger. The air conditioner water after heat exchange flows into the fan coil to be supplied to a user; the seawater side circulating water pump and cold energy circulating water pump is connected with the warm seawater skid-mounted integrated heat exchange unit, air-conditioning water is discharged into the seawater side circulating water pump and cold energy circulating water pump, the seawater side circulating water pump and cold energy circulating water pump is connected with the seawater source heat pump unit, and the seawater source heat pump unit discharges the air-conditioning water subjected to heat exchange into the fan coil and flows to a user. According to the composite air conditioning system of the LNG receiving station, cold and hot clean energy integration is achieved through cold energy generated during LNG gasification and warm seawater waste heat discharged by a power plant, resources are effectively saved, the environment is protected, and pollution is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of LNG receiving station engineering technology, and in particular relates to a composite air conditioning system for LNG receiving stations. Background Technology

[0002] In winter, heating for individual buildings in an LNG receiving terminal typically employs centralized heating systems, such as gas-fired boilers or heat exchange stations connected to the municipal heating network. Summer cooling for the receiving terminal utilizes air-cooled air-source heat pump units or gas-fired chiller units.

[0003] These traditional centralized heating and cooling systems are ultimately achieved through fuel oil, coal, natural gas, or electricity, which consumes a large amount of fuel and pollutes the environment. Meanwhile, when LNG is vaporized into high-pressure natural gas, it contains a large amount of high-grade cold energy, which is not being used properly. Most stations exchange heat with large amounts of seawater, and the heated seawater is eventually discharged back into the sea.

[0004] Therefore, there is an urgent need to design a composite air conditioning system for LNG receiving terminals to solve the problems mentioned above. Utility Model Content

[0005] To address the technical problem mentioned in the background that traditional centralized heating and cooling ultimately rely on fuel oil, coal, natural gas, or electricity, which consumes a large amount of fuel and causes environmental pollution, a composite air conditioning system for an LNG receiving station is provided to solve the problem of integrating clean energy for cooling and heating.

[0006] To achieve the above objectives, the specific technical solution of the composite air conditioning system for the LNG receiving station of this utility model is as follows:

[0007] A composite air conditioning system for an LNG receiving terminal includes a first evaporator and a superheater. The first evaporator is connected to the superheater, which is connected to a seawater-side circulating water pump that also functions as a cooling water pump. The superheater discharges air conditioning water into a plate heat exchanger, allowing the heat-exchanged air conditioning water to flow into fan coil units and be delivered to users. The seawater-side circulating water pump that also functions as a cooling water pump is connected to a warm seawater skid-mounted integrated heat exchange unit, which discharges air conditioning water into the seawater-side circulating water pump that also functions as a cooling water pump. The seawater-side circulating water pump that also functions as a cooling water pump is connected to a seawater source heat pump unit, which discharges the heat-exchanged air conditioning water into the fan coil units and delivers it to users.

[0008] Furthermore, the skid-mounted integrated heat exchanger unit for warm seawater includes a sand separator and a filter. The sand separator is connected to the filter so that the warm seawater flows through the sand separator and the filter in sequence to remove impurities.

[0009] Furthermore, it also includes a titanium plate heat exchanger, which is connected to a filter. The titanium plate heat exchanger exchanges heat between warm seawater and air conditioning water, and after cooling, the seawater is discharged back into the sea.

[0010] Furthermore, the titanium plate heat exchanger is connected to the seawater-side circulating water pump and the cold energy circulating water pump. A first valve is installed between the titanium plate heat exchanger and the seawater-side circulating water pump and the cold energy circulating water pump. The air conditioning water flows into the seawater-side circulating water pump and the cold energy circulating water pump through the first valve.

[0011] Furthermore, a second valve is installed between the seawater-side circulating water pump, which also serves as a cold energy circulating water pump, and the seawater source heat pump unit. The air conditioning water flows into the seawater source heat pump unit through the second valve.

[0012] Furthermore, a third valve and a fourth valve are installed between the seawater source heat pump unit and the titanium plate heat exchanger, through which the air conditioning water flows back to the titanium plate heat exchanger.

[0013] Furthermore, the superheater is connected to the second evaporator, and the superheater discharges the pre-cooled air conditioning water into the second evaporator to cool the air conditioning water.

[0014] Furthermore, a first butterfly valve is installed between the second evaporator and the seawater-side circulating water pump / cooling energy circulating water pump. The cooled air conditioning water flows into the seawater-side circulating water pump / cooling energy circulating water pump through the first butterfly valve.

[0015] Furthermore, a second butterfly valve is installed between the seawater circulating water pump, which also serves as the cold energy circulating water pump, and the plate heat exchanger, through which the air conditioning water flows into the plate heat exchanger.

[0016] Furthermore, a third butterfly valve is installed between the plate heat exchanger and the fan coil unit so that the air conditioning water flows into the fan coil unit through the third butterfly valve and is delivered to the user.

[0017] The composite air conditioning system for the LNG receiving terminal of this invention has the following advantages:

[0018] The cold energy recovery heat exchanger recovers the cold energy generated during the LNG vaporization process and uses it for summer cooling of each building in the receiving terminal. The skid-mounted integrated seawater source heat pump unit and the skid-mounted integrated warm seawater heat exchanger utilize the waste heat from the power plant, meeting the winter heating needs of each building in the receiving terminal. This application utilizes the cold energy generated during LNG vaporization and the waste heat from the warm seawater discharged from the power plant to achieve integrated cold and heat clean energy, effectively saving resources, protecting the environment, and reducing pollution. Attached Figure Description

[0019] Figure 1 This is a flowchart of the composite air conditioning system for the LNG receiving station of this utility model.

[0020] Explanation of markings in the diagram:

[0021] 1. First evaporator; 2. Superheater; 3. Second evaporator; 4. Seawater-side circulating water pump / cold energy circulating water pump; 5. Plate heat exchanger; 6. Fan coil unit; 7. User cold water circulating pump; 8. Sand separator; 9. Filter; 10. Titanium plate heat exchanger; 11. Seawater source heat pump unit; 12. User hot water circulating pump; 13. First butterfly valve; 14. Second butterfly valve; 15. Third butterfly valve; 16. Fourth butterfly valve; 17. Fifth butterfly valve; 18. Sixth butterfly valve; 19. First valve; 20. Second valve; 21. Third valve; 22. Fourth valve; 23. Fifth valve; 24. Sixth valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0024] The following is a reference to the appendix. Figure 1 This invention describes a composite air conditioning system for an LNG receiving terminal.

[0025] like Figure 1 As shown, the composite air conditioning system of the LNG receiving station in this utility model includes a first evaporator 1 and a superheater 2. The first evaporator 1 is connected to the superheater 2, and the superheater 2 is connected to a seawater-side circulating water pump / cooling energy circulating water pump 4, which discharges the air conditioning water into a plate heat exchanger 5 so that the air conditioning water after heat exchange flows into the fan coil unit 6 and is delivered to the user. The seawater-side circulating water pump / cooling energy circulating water pump 4 is connected to a warm seawater skid-mounted integrated heat exchange unit, which discharges the air conditioning water into the seawater-side circulating water pump / cooling energy circulating water pump 4. The seawater-side circulating water pump / cooling energy circulating water pump 4 is connected to a seawater source heat pump unit 11, which discharges the air conditioning water after heat exchange into the fan coil unit 6 and flows to the user.

[0026] The cold energy recovery heat exchanger recovers the cold energy generated during the LNG vaporization process and uses it for summer cooling of each building in the receiving terminal. The skid-mounted integrated seawater source heat pump unit and the skid-mounted integrated warm seawater heat exchanger utilize the waste heat from the power plant, meeting the winter heating needs of each building in the receiving terminal. This application utilizes the cold energy generated during LNG vaporization and the waste heat from the warm seawater discharged from the power plant to achieve integrated cold and heat clean energy, effectively saving resources, protecting the environment, and reducing pollution.

[0027] Furthermore, such as Figure 1 As shown, the integrated skid-mounted heat exchanger unit for warm seawater includes a desander 8 and a filter 9. The desander 8 is connected to the filter 9 so that the warm seawater flows through the desander 8 and the filter 9 in sequence to remove impurities. It also includes a titanium plate heat exchanger 10, which is connected to the filter 9. The titanium plate heat exchanger 10 exchanges heat between the warm seawater and the air conditioning water. After cooling, the seawater is discharged back into the sea. The titanium plate heat exchanger 10 is connected to the seawater-side circulating water pump and the cold energy circulating water pump 4. A first valve 19 is installed between the titanium plate heat exchanger 10 and the seawater-side circulating water pump and the cold energy circulating water pump 4. The air conditioning water flows into the seawater-side circulating water pump and the cold energy circulating water pump 4 through the first valve 19.

[0028] In this embodiment, preferably, the warm seawater skid-mounted integrated heat exchange unit consists of a sand separator 8, a filter 9, and a titanium plate heat exchanger 10. The first evaporator 1 is an LNG evaporator, the superheater 2 is an NG superheater, and the second evaporator 3 is an R410 evaporator; the LNG evaporator, the NG superheater, and the R410 evaporator constitute the cold energy recovery heat exchanger skid.

[0029] Furthermore, such as Figure 1 As shown, a second valve 20 is provided between the seawater-side circulating water pump and the cold energy circulating water pump 4 and the seawater source heat pump unit 11. The air conditioning water flows into the seawater source heat pump unit 11 through the second valve 20. A third valve 21 and a fourth valve 22 are provided between the seawater source heat pump unit 11 and the titanium plate heat exchanger 10. The air conditioning water flows back to the titanium plate heat exchanger 10 through the third valve 21 and the fourth valve 22.

[0030] In a preferred embodiment, warm seawater (denoted as D) from the power plant at 8-10°C in winter is discharged back into the sea after impurities are removed by a sand remover 8 and a filter 9.

[0031] After heat exchange, the air conditioning water temperature rises from 3.5℃ to 6.5℃. To prevent the air conditioning water from freezing, a 30% (mass concentration) ethylene glycol solution is added to the air conditioning water. The 6.5℃ air conditioning water enters the seawater-side circulating water pump / cold energy circulating water pump 4 through the first valve 19, and then enters the seawater source heat pump unit 11 through the second valve 20 for heat exchange.

[0032] After heat exchange, the air conditioning water becomes 3.5℃ and returns to the integrated warm seawater heat exchange unit for heat exchange through the third valve 21 and the fourth valve 22.

[0033] The high temperature of 50°C after heat exchange by the seawater heat pump unit 11 enters the fan coil unit 6 through the fifth valve 23 and is delivered to each user. After heat exchange, the user's hot water temperature drops to 45°C and enters the user's hot water circulation pump 7 through the sixth valve 24, returning to the seawater source heat pump unit 11 for heat exchange, thus completing the winter heating cycle.

[0034] Preferably, the first valve 19, the second valve 20, the third valve 21, the fourth valve 22, the fifth valve 23 and the sixth valve 24 are all electric butterfly valves, which are opened in winter and closed in summer.

[0035] Furthermore, such as Figure 1 As shown, the superheater 2 is connected to the second evaporator 3. The superheater 2 discharges the pre-cooled air conditioning water into the second evaporator 3 to cool the air conditioning water. A first butterfly valve 13 is provided between the second evaporator 3 and the seawater side circulating water pump and cold energy circulating water pump 4. The cooled air conditioning water flows into the seawater side circulating water pump and cold energy circulating water pump 4 through the first butterfly valve 13.

[0036] A second butterfly valve 14 is provided between the seawater circulating water pump and the cold energy circulating water pump 4 and the plate heat exchanger 5, through which air conditioning water flows into the plate heat exchanger 5; a third butterfly valve 15 is provided between the plate heat exchanger 5 and the fan coil unit 6, so that air conditioning water flows into the fan coil unit 6 through the third butterfly valve 15 and is delivered to the user.

[0037] In a preferred embodiment, LNG liquid at -163°C (denoted as A) enters the intermediate medium heat exchanger, where R410 gas in the tube side and shell side of the LNG evaporator exchanges heat and vaporizes into natural gas at -25°C. The -25°C natural gas enters the NG superheater and exchanges heat with 11°C air conditioning chilled water, pre-cooling the air conditioning chilled water while vaporizing into natural gas at 2°C (denoted as B), which is then transported out after entering the high-pressure natural gas manifold.

[0038] The pre-cooled 10.3°C air conditioning water enters the tube side of the R410 evaporator. After heat exchange with the liquefied R410 medium in the shell side, its temperature drops to 5°C before entering the air conditioning water supply line. The 5°C air conditioning water enters the seawater-side circulating water pump / cooling energy circulating water pump 4 on the seawater source heat pump skid-mounted integrated unit through the first butterfly valve 13, and then enters the plate heat exchanger 5 through the second butterfly valve 14 for heat exchange. The water after heat exchange is 8°C air conditioning water.

[0039] The 8°C air conditioning water enters the fan coil unit 6 through the third butterfly valve 15 and is delivered to the user. After heat exchange, the air conditioning water becomes 13°C and enters the user's chilled water circulation pump 7 through the fourth butterfly valve 16, returning to the plate heat exchanger 5. After heat exchange, the 11°C air conditioning refrigerant water returns to the cold energy recovery heat exchanger skid through the fifth butterfly valve 17 and the sixth butterfly valve 18, completing the summer cooling cycle.

[0040] Among them, the first butterfly valve 13, the second butterfly valve 14, the third butterfly valve 15, the fourth butterfly valve 16, the fifth butterfly valve 17 and the sixth butterfly valve 18 are all electric butterfly valves, which are closed in winter and open in summer.

[0041] This invention relates to a composite air conditioning system for LNG receiving terminals. It utilizes a cold energy recovery heat exchanger to recover the cooling energy generated during LNG vaporization and uses it for summer cooling of individual buildings within the terminal. Furthermore, it employs a seawater source heat pump skid-mounted integrated unit and a warm seawater skid-mounted integrated heat exchanger to utilize waste heat from the power plant, thus meeting the winter heating needs of the terminal's individual buildings. This application integrates the cooling energy generated during LNG vaporization and the waste heat from the warm seawater discharged from the power plant, achieving the integration of clean energy for both cooling and heating. This effectively conserves resources, protects the environment, and reduces pollution.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hybrid air conditioning system for an LNG receiving terminal, characterized in that, It includes a first evaporator and a superheater. The first evaporator is connected to the superheater, which is connected to a seawater-side circulating water pump that also serves as a cold energy circulating water pump. The superheater discharges the air conditioning water into the plate heat exchanger so that the air conditioning water after heat exchange flows into the fan coil unit and is delivered to the user. The seawater-side circulating water pump that also serves as a cold energy circulating water pump is connected to a warm seawater skid-mounted integrated heat exchange unit. The air conditioning water is discharged into the seawater-side circulating water pump that also serves as a cold energy circulating water pump. The seawater-side circulating water pump that also serves as a cold energy circulating water pump is connected to a seawater source heat pump unit. The seawater source heat pump unit discharges the air conditioning water after heat exchange into the fan coil unit and flows to the user.

2. The hybrid air conditioning system of an LNG receiving terminal according to claim 1, wherein, The skid-mounted integrated heat exchanger unit for warm seawater includes a sand separator and a filter. The sand separator is connected to the filter so that warm seawater flows through the sand separator and the filter in sequence to remove impurities.

3. The hybrid air conditioning system of an LNG receiving terminal according to claim 2, wherein, It also includes titanium plate heat exchangers, which are connected to filters. The titanium plate heat exchangers exchange heat between warm seawater and air conditioning water, and the cooled seawater is discharged back into the sea.

4. The hybrid air conditioning system of an LNG receiving terminal according to claim 3, wherein, The titanium plate heat exchanger is connected to the seawater-side circulating water pump and the cold energy circulating water pump. A first valve is installed between the titanium plate heat exchanger and the seawater-side circulating water pump and the cold energy circulating water pump. The air conditioning water flows into the seawater-side circulating water pump and the cold energy circulating water pump through the first valve.

5. The hybrid air conditioning system of an LNG receiving terminal according to claim 4, wherein, A second valve is installed between the seawater-side circulating water pump, which also serves as a cold energy circulating water pump, and the seawater source heat pump unit. The air conditioning water flows into the seawater source heat pump unit through the second valve.

6. The hybrid air conditioning system of an LNG receiving terminal according to claim 5, wherein, A third valve and a fourth valve are installed between the seawater source heat pump unit and the titanium plate heat exchanger. The air conditioning water flows back to the titanium plate heat exchanger through the third valve and the fourth valve.

7. The hybrid air conditioning system of an LNG receiving terminal according to claim 1, wherein, The superheater is connected to the second evaporator. The superheater discharges the pre-cooled air conditioning water into the second evaporator to cool the air conditioning water.

8. The hybrid air conditioning system of an LNG receiving terminal according to claim 7, wherein, A first butterfly valve is installed between the second evaporator and the seawater-side circulating water pump / cooling energy circulating water pump. The cooled air conditioning water flows into the seawater-side circulating water pump / cooling energy circulating water pump through the first butterfly valve.

9. The hybrid air conditioning system of an LNG receiving terminal according to claim 8, wherein, A second butterfly valve is installed between the seawater circulating water pump, which also serves as the cold energy circulating water pump, and the plate heat exchanger. The air conditioning water flows into the plate heat exchanger through the second butterfly valve.

10. The hybrid air conditioning system of an LNG receiving terminal according to claim 9, wherein, A third butterfly valve is installed between the plate heat exchanger and the fan coil unit so that the air conditioning water flows into the fan coil unit through the third butterfly valve and is delivered to the user.

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