Cooling and ice supply system based on central heating facility

Abstract

The invention discloses a cold and ice supply system based on a central heating facility in the technical field of refrigeration, which comprises a heat source heat exchange module and a tail end heat exchange module, and further comprises an absorption type refrigeration module connected in parallel with the heat source heat exchange module, one of the heat release side of the absorption type refrigeration module and the heat release side of the heat source heat exchange module is selected to communicate with a heat source inlet and outlet pipeline, and one of the heat removal side of the absorption type refrigeration module and the heat removal side of the heat source heat exchange module is selected to communicate with the heat release side of the tail end heat exchange module through a water supply and return pipeline. The heat taking side of the tail end heat exchange module is used for communicating with a water supply and return pipeline of a user. Wherein the absorption refrigeration module supplies cold and / or ice through a built-in evaporator. The system can supply cold in a centralized mode in summer, the annual utilization rate of the system is high, and meanwhile the ice making function is added.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and in particular to a cooling and ice supply system based on a centralized heating facility. Background Art

[0002] At present, the urban heating mode is gradually developing towards a method that uses large-scale thermal power plants as the heat source for centralized heating. For example, a Chinese patent document with a publication date of March 19, 2019 and an authorization publication number of CN109489101B discloses a centralized heating system and a centralized heating method. The centralized heating system includes at least one heat source heat exchange system, at least one absorption heat exchange system and at least one compression heat exchange system. The centralized heating method includes the steps of exchanging heat between the heat source heating medium and the primary network water, circulating the primary network water, exchanging heat between the primary network water and the secondary network water, circulating the secondary network water, exchanging heat between the secondary network water and the tertiary network water, and supplying and returning water to the tertiary network. Compared with the existing centralized heating method with a large temperature difference, the present invention maintains the heating capacity of the secondary network water supply pipeline without increasing the water supply temperature and water pressure of the old urban heating network and without affecting the heat transport capacity of the urban heating network, thereby saving the renovation cost of the existing pipeline network.

[0003] However, this type of centralized heating system is generally only used for heating in winter, and the utilization rate of the entire system is low throughout the year. At the same time, it does not have an ice-making function and is idle when not cooling / heating, and cannot bring more economic benefits. Summary of the Invention

[0004] The purpose of the present invention is to provide a cooling and ice supply system based on centralized heating facilities, which solves the defects of existing heating systems that are generally only used for heating in winter, have low utilization rate of the entire system throughout the year, and have no ice making function.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A cooling and ice supply system based on a centralized heating facility, comprising a heat source heat exchange module and a terminal heat exchange module.

[0007] The system also includes an absorption refrigeration module, which is arranged in parallel with the heat source heat exchange module, and one of the heat release side of the absorption refrigeration module and the heat release side of the heat source heat exchange module is connected to the heat source inlet and outlet pipes, and one of the heat collection side of the absorption refrigeration module and the heat collection side of the heat source heat exchange module is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes, and the heat collection side of the terminal heat exchange module is used to connect to the user's supply and return water pipes;

[0008] The absorption refrigeration module provides cooling and / or ice via a built-in evaporator.

[0009] A further improvement is that the absorption refrigeration module includes an absorber, a generator, a condenser and an evaporator;

[0010] In which, the shell side of the generator is provided with a gaseous refrigerant outlet, a lean liquid outlet, and a rich liquid inlet, the tube side of the generator is provided with a heat source inlet and a heat source outlet for connection to the heat source inlet and outlet pipes, the shell side of the absorber is provided with a lean liquid inlet, a rich liquid outlet, and a gaseous refrigerant inlet, cooling water circulates in the tube side of the absorber, the shell side of the condenser is provided with a gaseous refrigerant inlet and a liquid refrigerant outlet, cooling water circulates in the tube side of the condenser, the shell side of the evaporator is provided with a liquid refrigerant inlet and a gaseous refrigerant outlet, and the tube side of the evaporator is circulated with a cold medium required for cooling and / or ice supply, the gaseous refrigerant outlet of the generator is connected to the gaseous refrigerant inlet of the condenser, the lean liquid outlet of the generator is connected to the lean liquid inlet of the absorber, the rich liquid outlet of the absorber is connected to the rich liquid inlet of the generator through a circulating pump, the liquid refrigerant outlet of the condenser is connected to the liquid refrigerant inlet of the evaporator, and the gaseous refrigerant outlet of the evaporator is connected to the gaseous refrigerant inlet of the absorber.

[0011] A further improvement is that a pressure reducing valve is provided on the pipeline between the liquid refrigerant outlet of the condenser and the liquid refrigerant inlet of the evaporator.

[0012] A further improvement is that a throttle valve is provided on the pipeline between the lean liquid outlet of the generator and the lean liquid inlet of the absorber.

[0013] A further improvement is that the refrigerant used in the absorption refrigeration module is ammonia refrigerant.

[0014] A further improvement is that there are two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel, wherein cold water circulates in the tube side of the cooling evaporator and is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling, and at least one ice mold is provided on the tube side of the ice supply evaporator, and the ice mold is provided with a water supply port and an ice outlet for direct ice supply.

[0015] A further improvement is that there are two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel, wherein cold water circulates in the tube side of the cooling evaporator and is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling, and a refrigerant circulates in the tube side of the ice supply evaporator. The system also includes at least one external ice mold, which is provided with a water supply port and an ice outlet port. The refrigerant in the tube side of the ice supply evaporator is connected to the ice mold to achieve ice supply through indirect heat exchange with the refrigerant.

[0016] A further improvement is that the evaporator has one, and a refrigerant circulates in the tube side of the evaporator. The refrigerant in the tube side of the evaporator is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling. The system also includes at least one external ice mold, which is provided with a water supply port and an ice outlet port. The refrigerant in the tube side of the evaporator is also connected to the ice mold to realize ice supply through indirect heat exchange with the refrigerant.

[0017] A further improvement is that the coolant is selected from one of ethylene glycol aqueous solution, glycerol aqueous solution, calcium chloride aqueous solution or Freon.

[0018] A further improvement is that the system also includes a secondary heat exchange module, and either the heat-taking side of the absorption refrigeration module or the heat-taking side of the heat source heat exchange module is first connected to the heat-releasing side of the secondary heat exchange module through a supply and return water pipe, and then the heat-taking side of the secondary heat exchange module is connected to the heat-releasing side of the terminal heat exchange module through the supply and return water pipe.

[0019] The beneficial effects of the present invention are:

[0020] (1) The present invention adds a refrigeration module to the original centralized heating system. By utilizing the original heat source and heating pipes, centralized cooling can be achieved in summer, making the system highly utilized throughout the year. An ice-making function is also added. By switching between cooling water and ice-making through a valve, ice can be made for storage or sale when neither heating nor cooling water is supplied, thereby further improving the system utilization and economic benefits.

[0021] (2) The present invention uses ammonia refrigerant, which can achieve a lower refrigeration temperature than lithium bromide refrigerant, achieve a larger inlet and outlet temperature difference, reduce the circulation volume of cold water (or refrigerant), and greatly reduce the pumping power consumption of cold water (or refrigerant).

[0022] (3) In a preferred embodiment of the present invention, the refrigerant is prepared in the evaporator and then used to make ice in each ice mold. This can reduce the amount of ammonia used and reduce safety risks. At the same time, one or two evaporators can be used, and the ice mold and centralized cooling can be used separately or together, making the system layout more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the cooling and ice supply system based on the centralized heating facility of the present invention;

[0024] Figure 2 This is a schematic diagram of the specific connection of the absorption refrigeration module in Example 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the specific connection of the absorption refrigeration module in Example 2 of the present invention;

[0026] Figure 4 This is a specific connection diagram of the absorption refrigeration module in Example 3 of the present invention. DETAILED DESCRIPTION

[0027] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0028] Example 1

[0029] Combine Figure 1 and Figure 2 As shown, a cooling and ice supply system based on a centralized heating facility includes a heat source heat exchange module, a secondary heat exchange module and a terminal heat exchange module;

[0030] The system also includes an absorption refrigeration module, which is arranged in parallel with the heat source heat exchange module. The heat release side of the absorption refrigeration module or the heat release side of the heat source heat exchange module is connected to the heat source inlet and outlet pipes. The heat collection side of the absorption refrigeration module or the heat collection side of the heat source heat exchange module is connected to the heat release side of the secondary heat exchange module via the supply and return water pipes. The heat collection side of the secondary heat exchange module is connected to the heat release side of the terminal heat exchange module via the supply and return water pipes. The heat collection side of the terminal heat exchange module is used to connect to the user's supply and return water pipes. That is, by setting a valve, when centralized heating is required, the existing heat source heat exchange module is selected to access the passage for heating. When centralized cooling or ice making is required, the absorption refrigeration module is selected to access the passage for cooling. In terms of module composition, the heat source heat exchange module includes a heat source heat exchange device, a circulation pump, a primary network water supply pipe, and a primary network return pipe. The secondary heat exchange module includes an absorption heat exchange device, a circulation pump, a secondary network water supply pipe, and a secondary network return pipe. The terminal heat exchange module includes a compression heat pump and a circulation pump. The connection relationship between these modules and the heating operating principle are prior art. For details, please refer to the content of CN109489101B patent document and will not be repeated here. Of course, other heat exchange devices can also be used for the heat source heat exchange module, secondary heat exchange module, and terminal heat exchange module.

[0031] In this embodiment, the system includes a secondary heat exchange module. Either the heat-receiving side of the absorption refrigeration module or the heat-receiving side of the heat-source heat exchange module is first connected to the heat-releasing side of the secondary heat exchange module via a water supply / return pipe. The heat-receiving side of the secondary heat exchange module is then connected to the heat-releasing side of the terminal heat exchange module via the water supply / return pipe. This indirect connection facilitates system layout. Of course, the secondary heat exchange module can also be omitted, and the heat-receiving side of the absorption refrigeration module or the heat-receiving side of the heat-source heat exchange module can be directly connected to the heat-releasing side of the terminal heat exchange module, further simplifying the system.

[0032] In this embodiment, the absorption refrigeration module can adopt the conventional structure of the prior art, which includes an absorber, a generator, a condenser and an evaporator; wherein, the shell side of the generator is provided with a gaseous refrigerant outlet, a lean liquid outlet and a rich liquid inlet, the tube side of the generator is provided with a heat source inlet and a heat source outlet for connecting with the heat source inlet and outlet pipes, the shell side of the absorber is provided with a lean liquid inlet, a rich liquid outlet and a gaseous refrigerant inlet, cooling water circulates in the tube side of the absorber, the shell side of the condenser is provided with a gaseous refrigerant inlet and a liquid refrigerant outlet, and the tube side of the condenser is provided with a gaseous refrigerant inlet and a liquid refrigerant outlet. Cooling water flows therein, and a liquid refrigerant inlet and a gaseous refrigerant outlet are provided on the shell side of the evaporator. A cold medium required for cooling and / or ice supply circulates in the tube side of the evaporator, the gaseous refrigerant outlet of the generator is connected with the gaseous refrigerant inlet of the condenser, the lean liquid outlet of the generator is connected with the lean liquid inlet of the absorber, the rich liquid outlet of the absorber is connected with the rich liquid inlet of the generator through a circulating pump, the liquid refrigerant outlet of the condenser is connected with the liquid refrigerant inlet of the evaporator, and the gaseous refrigerant outlet of the evaporator is connected with the gaseous refrigerant inlet of the absorber.

[0033] In addition, a pressure reducing valve is provided on the pipeline between the liquid refrigerant outlet of the condenser and the liquid refrigerant inlet of the evaporator. A throttle valve is provided on the pipeline between the lean liquid outlet of the generator and the lean liquid inlet of the absorber.

[0034] When the absorption refrigeration module is working: the heat source enters the generator, heats the rich solution therein, and converts it into a lean solution and a medium-pressure gaseous refrigerant. The lean solution is discharged from the lean liquid outlet, and after decompression, it enters the absorber from the lean liquid inlet. At the same time, the medium-pressure gaseous refrigerant is discharged from the medium-pressure gaseous refrigerant outlet, enters the condenser from the medium-pressure gaseous refrigerant inlet, and exchanges heat with the circulating water therein. After becoming a medium-pressure liquid refrigerant, it is discharged from the medium-pressure liquid refrigerant outlet; after the medium-pressure liquid refrigerant is decompressed, it becomes a low-pressure liquid refrigerant, and then is discharged from the medium-pressure liquid refrigerant outlet. The low-pressure liquid refrigerant inlet enters the evaporator and exchanges heat with the cold water or refrigerant inside (causing the low-pressure liquid refrigerant to evaporate). After becoming a low-pressure gaseous refrigerant, the low-pressure gaseous refrigerant is discharged from the low-pressure gaseous refrigerant outlet and enters the absorber from the low-pressure gaseous refrigerant inlet. After mixing with the lean solution there to form a rich solution (during the mixing process, the rich solution will exchange heat with the circulating water inside the tubes inside the absorber), it is discharged from the rich liquid outlet, pressurized by the circulating pump, and then enters the generator from the rich liquid inlet for circulation. In this way, the absorption refrigeration module can output the cold medium from the evaporator by introducing a heat source.

[0035] In this embodiment, there are two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel, wherein cold water circulates in the tube side of the cooling evaporator, and is connected to the heat release side of the secondary heat exchange module through the supply and return water pipe for cooling (the generated cold water is subjected to the processes of secondary network water circulation, heat exchange between secondary network water and tertiary network water, and tertiary network water supply and return water to realize cooling for users, the same below), and at least one ice mold is provided on the tube side of the ice supply evaporator, and the ice mold is provided with a water supply port and an ice outlet for direct ice supply.

[0036] Therefore, the present invention adds a refrigeration module on the basis of not changing the original centralized heating facilities. By utilizing the original heat source and heating pipes, centralized cooling can be achieved in summer, making the system highly utilized throughout the year. At the same time, an ice-making function is added. By switching between cooling water and ice-making through a valve, ice can be made for storage or sale when neither heating nor cold water is supplied, thereby further improving the system utilization rate and economic benefits.

[0037] Example 2

[0038] Combine Figure 1 and Figure 3 As shown, Example 2 has a similar overall structure to Example 1, also featuring two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel. The difference lies in that cold water circulates through the tubes of the cooling evaporator and is connected to the heat release side of the secondary heat exchange module via supply and return water pipes for cooling. A refrigerant circulates through the tubes of the ice supply evaporator. The system also includes at least one external ice mold equipped with a water supply port and an ice outlet. The refrigerant in the tubes of the ice supply evaporator is connected to the ice mold to achieve ice supply through indirect heat exchange with the refrigerant. This allows for centralized heating, cooling, and ice supply.

[0039] Example 3

[0040] Combine Figure 1 and Figure 4 As shown, Example 3 has a similar overall structure to Example 1, but only has a single evaporator. Specifically, a brine circulates within the evaporator's tubes, communicating with the heat-releasing side of the secondary heat exchange module via supply and return water pipes for cooling. The system also includes at least one external ice mold, equipped with a water inlet and an ice outlet. The brine within the evaporator's tubes is also connected to the ice mold, enabling indirect heat exchange with the brine to provide ice. This allows for centralized heating, cooling, and ice supply, all while utilizing a single evaporator. The ice mold and centralized cooling can be used together.

[0041] It should be noted that the refrigerant used in the above embodiment is ammonia refrigerant, which can achieve a lower refrigeration temperature than lithium bromide refrigerant, achieve a larger inlet and outlet temperature difference, reduce the circulation volume of cold water (or refrigerant), and greatly reduce the pumping power consumption of cold water (or refrigerant). The refrigerant used in the above embodiment is selected from one of ethylene glycol aqueous solution, glycerol aqueous solution, calcium chloride aqueous solution or Freon. The present invention prepares the refrigerant in the evaporator and then makes ice in each ice mold, which can reduce the amount of ammonia used and reduce safety risks. At the same time, one evaporator or two evaporators can be selected, and the ice mold and centralized cooling can be used separately or together, which makes the system layout more flexible.

[0042] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A cooling and ice supply system based on a centralized heating facility, comprising a heat source heat exchange module and a terminal heat exchange module, characterized in that: The system also includes an absorption refrigeration module, which is arranged in parallel with the heat source heat exchange module, and one of the heat release side of the absorption refrigeration module and the heat release side of the heat source heat exchange module is connected to the heat source inlet and outlet pipes, and one of the heat collection side of the absorption refrigeration module and the heat collection side of the heat source heat exchange module is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes, and the heat collection side of the terminal heat exchange module is used to connect to the user's supply and return water pipes; The absorption refrigeration module provides cooling and / or ice via a built-in evaporator.

2. The cooling and ice supply system based on the centralized heating facility according to claim 1, characterized in that: The absorption refrigeration module includes an absorber, a generator, a condenser and an evaporator; In which, the shell side of the generator is provided with a gaseous refrigerant outlet, a lean liquid outlet, and a rich liquid inlet, the tube side of the generator is provided with a heat source inlet and a heat source outlet for connection to the heat source inlet and outlet pipes, the shell side of the absorber is provided with a lean liquid inlet, a rich liquid outlet, and a gaseous refrigerant inlet, cooling water circulates in the tube side of the absorber, the shell side of the condenser is provided with a gaseous refrigerant inlet and a liquid refrigerant outlet, cooling water circulates in the tube side of the condenser, the shell side of the evaporator is provided with a liquid refrigerant inlet and a gaseous refrigerant outlet, and the tube side of the evaporator is circulated with a cold medium required for cooling and / or ice supply, the gaseous refrigerant outlet of the generator is connected to the gaseous refrigerant inlet of the condenser, the lean liquid outlet of the generator is connected to the lean liquid inlet of the absorber, the rich liquid outlet of the absorber is connected to the rich liquid inlet of the generator through a circulating pump, the liquid refrigerant outlet of the condenser is connected to the liquid refrigerant inlet of the evaporator, and the gaseous refrigerant outlet of the evaporator is connected to the gaseous refrigerant inlet of the absorber.

3. The cooling and ice supply system based on the centralized heating facility according to claim 2, characterized in that: A pressure reducing valve is provided on the pipeline between the liquid refrigerant outlet of the condenser and the liquid refrigerant inlet of the evaporator.

4. The cooling and ice supply system based on the centralized heating facility according to claim 2, characterized in that: A throttle valve is provided on the pipeline between the lean liquid outlet of the generator and the lean liquid inlet of the absorber.

5. The cooling and ice supply system based on the centralized heating facility according to claim 2, characterized in that: The refrigerant used in the absorption refrigeration module is ammonia refrigerant.

6. The cooling and ice supply system based on the centralized heating facility according to claim 2, characterized in that: There are two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel, wherein cold water circulates in the tube side of the cooling evaporator and is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling. At least one ice mold is provided on the tube side of the ice supply evaporator, and the ice mold is provided with a water supply port and an ice outlet for direct ice supply.

7. The cooling and ice supply system based on a centralized heating facility according to claim 2, characterized in that: There are two evaporators, including a cooling evaporator and an ice supply evaporator arranged in parallel, wherein cold water circulates in the tube side of the cooling evaporator and is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling, and a refrigerant circulates in the tube side of the ice supply evaporator. The system also includes at least one external ice mold, which is provided with a water supply port and an ice outlet port. The refrigerant in the tube side of the ice supply evaporator is connected to the ice mold to achieve ice supply through indirect heat exchange with the refrigerant.

8. The cooling and ice supply system based on a centralized heating facility according to claim 2, characterized in that: The evaporator has one, and a refrigerant circulates in the tube side of the evaporator. The refrigerant in the tube side of the evaporator is connected to the heat release side of the terminal heat exchange module through the supply and return water pipes for cooling. The system also includes at least one external ice mold, which is provided with a water supply port and an ice outlet. The refrigerant in the tube side of the evaporator is also connected to the ice mold to realize ice supply through indirect heat exchange with the refrigerant.

9. The cooling and ice supply system based on a centralized heating facility according to claim 7 or 8, characterized in that: The coolant is selected from one of ethylene glycol aqueous solution, glycerol aqueous solution, calcium chloride aqueous solution or Freon.

10. The cooling and ice supply system based on a centralized heating facility according to claim 1, characterized in that: The system also includes a secondary heat exchange module, and either the heat-taking side of the absorption refrigeration module or the heat-taking side of the heat source heat exchange module is first connected to the heat-releasing side of the secondary heat exchange module through a supply and return water pipe, and then the heat-taking side of the secondary heat exchange module is connected to the heat-releasing side of the terminal heat exchange module through the supply and return water pipe.

Images