Lithium bromide refrigerating system

Abstract

According to the lithium bromide refrigerating system, cooling water in a water outlet pipe is conveyed to a water inlet pipe through a bypass water inlet pipe and a bypass water outlet pipe in sequence through operation of a bypass pump, so that self-circulation that the cooling water flows back after being discharged from a lithium bromide unit is achieved; therefore, the cooling water is heated through heat generated by bypass return water circulation of the cooling water and circulation of equipment, the temperature of the cooling water is increased, the starting condition of the lithium bromide unit is met, stable operation of the lithium bromide unit after starting can be guaranteed in severe cold areas with low external temperature, the lithium bromide unit is protected, and the service life of the lithium bromide unit is prolonged. And the operation time of the lithium bromide unit is prolonged.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a lithium bromide refrigeration system. Background Technology

[0002] A lithium bromide absorption chiller (LBAC) is a device based on an absorption refrigeration cycle that uses thermal energy as the driving energy source to achieve a cooling effect. Unlike traditional compression refrigeration systems, LBAC does not rely on a mechanical compressor; instead, it transfers heat through the absorption and release of moisture in an aqueous lithium bromide solution. Lithium bromide refrigerant can be widely used in commercial buildings, hospitals, hotels, data centers, and other locations requiring large-scale cooling and air conditioning systems. Especially in places with a stable waste heat supply, such as factories and power plants, it can effectively convert waste heat into usable cooling capacity.

[0003] Throughout the process, to prevent solution crystallization, lithium bromide chillers have certain requirements for the minimum temperature of the cooling water circulation path. Generally, the inlet water temperature should not be lower than 19°C. This means that in cold northern regions, the equipment is greatly affected by the circulating water temperature during the transition season and winter. When the outside temperature is too low, the unit will stop operating to protect itself, resulting in less operating time each year. Utility Model Content

[0004] The purpose of this application is to provide a lithium bromide refrigeration system that can ensure stable operation of the lithium bromide unit after startup even in extremely cold regions with low ambient temperatures, thereby protecting the lithium bromide unit and extending its operating time.

[0005] The embodiments of this application can be implemented as follows:

[0006] In a first aspect, this utility model provides a lithium bromide refrigeration system, comprising an inlet pipe, a lithium bromide unit, an outlet pipe, and a bypass pipe connected to the outlet pipe in sequence. The bypass pipe includes a bypass inlet pipe, a bypass pump, and a bypass outlet pipe connected in sequence. The inlet end of the bypass inlet pipe is connected to the inlet pipe, and the outlet end of the bypass outlet pipe is connected to the inlet pipe. The bypass pump is used to transport cooling water in the outlet pipe to the inlet pipe.

[0007] In an optional embodiment, the lithium bromide refrigeration system further includes a cooling water inlet pipe, a cooler, and a cooling water outlet pipe connected in sequence, with the inlet end of the cooling water inlet pipe connected to the outlet pipe and the outlet end of the cooling water outlet pipe connected to the inlet pipe.

[0008] In an optional embodiment, the cooling water inlet pipe and the bypass water inlet pipe are connected by a branch pipe.

[0009] In an optional embodiment, the inlet pipe is equipped with a temperature sensor located downstream of the outlet end of the bypass outlet pipe; the branch pipe can adjust the water flow rate according to the detection result of the temperature sensor.

[0010] In an optional embodiment, the branch pipe is provided with a branch pipe valve, which can adjust the opening degree according to the detection result of the temperature sensor.

[0011] In an optional embodiment, a cooling valve is provided on the cooling water inlet pipe near its own inlet end.

[0012] In an optional embodiment, the bypass inlet pipe and / or the bypass outlet pipe are provided with bypass valves.

[0013] In an optional embodiment, the bypass outlet pipe has a bypass valve located near its inlet and outlet ends, respectively.

[0014] In an optional embodiment, the inlet pipe is provided with an inlet valve, which is located upstream of the outlet end of the bypass outlet pipe.

[0015] In an optional embodiment, the outlet pipe is provided with an outlet valve, which is located upstream of the inlet end of the bypass inlet pipe.

[0016] The beneficial effects of the embodiments of this application include, for example:

[0017] By operating a bypass pump, cooling water in the outlet pipe is sequentially transported through the bypass inlet pipe and bypass outlet pipe back to the inlet pipe. This achieves a self-circulation of cooling water discharged from the lithium bromide unit and then flowing back. The heat generated by the bypass return water circulation and the equipment's own circulation heats the cooling water, raising its temperature to meet the start-up conditions of the lithium bromide unit. This ensures stable operation of the lithium bromide unit even in extremely cold regions with low ambient temperatures, thus protecting the unit and extending its operating time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a lithium bromide refrigeration system according to an embodiment of this application.

[0020] Icons: 10-Inlet pipe; 11-Inlet valve; 12-Temperature sensor; 20-Lithium bromide unit; 30-Outlet pipe; 31-Outlet valve; 40-Bypass inlet pipe; 41-Bypass pump; 42-Bypass outlet pipe; 43-Bypass valve; 50-Cooling inlet pipe; 51-Cooling tower; 53-Cooling outlet pipe; 54-Cooling valve; 60-Branch pipe; 61-Branch valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] The following is combined Figure 1 This application provides a detailed description of some embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] This application discloses a lithium bromide refrigeration system, including an inlet pipe 10, a lithium bromide unit 20, an outlet pipe 30, and a bypass pipe connected to the outlet pipe 30 in sequence. The bypass pipe includes a bypass inlet pipe 40, a bypass pump 41, and a bypass outlet pipe 42 connected in sequence. The inlet end of the bypass inlet pipe 40 is connected to the inlet pipe 10, and the outlet end of the bypass outlet pipe 42 is connected to the inlet pipe 10. The bypass pump 41 is used to transport cooling water in the outlet pipe 30 to the inlet pipe 10.

[0029] In this way, by operating the bypass pump 41, the cooling water in the outlet pipe 30 is sequentially transported to the inlet pipe 10 through the bypass inlet pipe 40 and the bypass outlet pipe 42. This achieves a self-circulation of cooling water after it is discharged from the lithium bromide unit 20 and then flows back. The cooling water is heated by the bypass return water circulation and the heat generated by the equipment's own circulation, thereby increasing the cooling water temperature and meeting the start-up conditions of the lithium bromide unit 20. In this way, the lithium bromide unit 20 can also ensure stable operation after startup in extremely cold regions with low outside temperatures, thus protecting the lithium bromide unit 20 and extending its operating time.

[0030] In this embodiment, the inlet pipe 10 is equipped with an inlet valve 11, which is located upstream of the outlet end of the bypass outlet pipe 42. The outlet pipe 30 is equipped with an outlet valve 31, which is located upstream of the inlet end of the bypass inlet pipe 40. This allows the operation of the lithium bromide unit 20 to be selected based on the opening or closing of the inlet valve 11 and the outlet valve 31. That is, when both the inlet valve 11 and the outlet valve 31 are open, the bypass pump 41 can be operated to achieve self-circulation, so that the lithium bromide unit 20 can be started and operated stably after the water temperature reaches the required level. When the lithium bromide unit 20 is not required for cooling, the inlet valve 11, the outlet valve 31, and the bypass pump 41 can be closed.

[0031] Of course, in order to dissipate heat from the lithium bromide aqueous solution inside the lithium bromide unit 20, the lithium bromide refrigeration system also includes a cooling water inlet pipe 50, a cooler, and a cooling water outlet pipe 53 connected in sequence. The cooler can specifically be a cooling tower 51. The inlet end of the cooling water inlet pipe 50 is connected to the outlet pipe 30, and the outlet end of the cooling water outlet pipe 53 is connected to the inlet pipe 10. The inlet end of the cooling water inlet pipe 50 is located upstream of the outlet valve 31, that is, the outlet valve 31 is located between the inlet end of the cooling water inlet pipe 50 and the inlet end of the bypass inlet pipe 40. In this way, after the lithium bromide unit 20 is started and running stably, a portion of the cooling water can be transported to the cooler through the cooling water inlet pipe 50 for cooling and temperature reduction. Then, the low-temperature cooling water is transported to the inlet pipe 10 through the cooling water outlet pipe 53 to reduce the temperature of the cooling water sent into the lithium bromide unit 20 through the inlet pipe 10, so as to achieve the effect of absorbing the heat of the lithium bromide aqueous solution for cooling.

[0032] The cooling water inlet pipe 50 and the bypass water inlet pipe 40 are connected by a branch pipe 60. The branch pipe 60 serves to divert the flow, so that when the inlet water temperature is low, most or even all of the cooling water inlet pipe 50 can enter the bypass water inlet pipe 40 through the branch pipe 60, so as to prevent the cooler from participating in the circulation during the preheating period of the lithium bromide unit 20.

[0033] A temperature sensor 12 is installed in the inlet pipe 10. The temperature sensor 12 is located downstream of the outlet end of the bypass outlet pipe 42. This allows the temperature sensor 12 to detect the real-time water temperature at the inlet side of the lithium bromide unit 20. The branch pipe 60 can adjust the water flow rate according to the detection result of the temperature sensor 12, that is, according to the real-time water temperature. When the water temperature is low, the water flow rate is large. After the water temperature meets the start-up conditions of the lithium bromide unit 20, the water flow rate is reduced so that after the lithium bromide unit 20 is started, some of the cooling water can be sent to the cooling tower 51 for heat dissipation and cooling, thereby realizing the circulation and cooling of the lithium bromide aqueous solution. The other part of the cooling water continues to circulate through the bypass pipe to ensure the temperature of the lithium bromide equipment.

[0034] A branch valve 61 is provided in the branch pipe 60. The branch valve 61 can adjust the opening degree according to the detection result of the temperature sensor 12 to realize flow regulation.

[0035] Of course, in order to ensure stable operation of the lithium bromide unit 20 after startup, the cooling tower 51 delivers cooler cooling water to the inlet pipe 10. However, during the self-circulation heating process before the lithium bromide unit 20 is in stable operation, the cooling water from the cooling tower 51 is not delivered to the inlet pipe 10. Therefore, a cooling valve 54 can be installed on the cooling outlet pipe 53 and / or the cooling inlet pipe 50 to open or close the cooling outlet pipe 53 and / or the cooling inlet pipe 50. If the cooling valve 54 is installed on the cooling inlet pipe 50, it is located upstream of the inlet end of the branch pipe 60. That is, the cooling valve 54 is installed on the cooling inlet pipe 50 near its own inlet end, so that the cooling valve 54 and the outlet valve 31 are close together, allowing workers to control whether the cooling water in the outlet pipe 30 needs to enter the cooling inlet pipe 50 from a nearby position.

[0036] Bypass valves 43 are provided on the bypass inlet pipe 40 and / or bypass outlet pipe 42 to selectively close the bypass inlet pipe 40 and / or bypass outlet pipe 42. The bypass outlet pipe 42 has a bypass valve 43 located near its inlet and outlet ends, while the bypass valve 43 on the bypass inlet pipe 40 is located near the bypass pump 41 and branch valve 61, allowing workers to conveniently operate these valves from a nearby location within the plant.

[0037] Normally, all valves in this application, except for branch valve 61, are in the normally open state. The other valves can be closed when needed, such as for maintenance, and reopened afterward. When temperature sensor 12 detects a water temperature below 19°C, for example, 11°C, branch valve 61 is opened to its maximum, causing a large amount of cooling water in outlet pipe 30 to flow back to inlet pipe 10 via bypass pump 41. This self-circulation raises the water temperature on the inlet side of lithium bromide unit 20, thereby raising the water temperature to the equipment's start-up condition (above 19°C) within half an hour. When temperature sensor 12 detects a water temperature above 25°C, branch valve 61 is opened less, allowing some cooling water to be sent to cooling tower 51 while the rest continues to circulate back.

[0038] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lithium bromide refrigeration system, characterized in that, The system includes an inlet pipe (10), a lithium bromide generator (20), an outlet pipe (30), and a bypass pipe connected to the outlet pipe (30) in sequence. The bypass pipe includes a bypass inlet pipe (40), a bypass pump (41), and a bypass outlet pipe (42) connected in sequence. The inlet end of the bypass inlet pipe (40) is connected to the inlet pipe (10), and the outlet end of the bypass outlet pipe (42) is connected to the inlet pipe (10). The bypass pump (41) is used to transport the cooling water in the outlet pipe (30) to the inlet pipe (10).

2. The lithium bromide refrigeration system according to claim 1, characterized in that, The lithium bromide refrigeration system further includes a cooling water inlet pipe (50), a cooler, and a cooling water outlet pipe (53) connected in sequence. The inlet end of the cooling water inlet pipe (50) is connected to the outlet pipe (30), and the outlet end of the cooling water outlet pipe (53) is connected to the inlet pipe (10).

3. The lithium bromide refrigeration system according to claim 2, characterized in that, The cooling water inlet pipe (50) and the bypass water inlet pipe (40) are connected by a branch pipe (60).

4. The lithium bromide refrigeration system according to claim 3, characterized in that, The inlet pipe (10) is equipped with a temperature sensor (12), which is located downstream of the outlet end of the bypass outlet pipe (42); the branch pipe (60) can adjust the water flow rate according to the detection result of the temperature sensor (12).

5. The lithium bromide refrigeration system according to claim 4, characterized in that, The branch pipe (60) is equipped with a branch valve (61), which can adjust the opening degree according to the detection result of the temperature sensor (12).

6. The lithium bromide refrigeration system according to claim 3, characterized in that, A cooling valve (54) is provided on the cooling water inlet pipe (50) near its own water inlet end.

7. The lithium bromide refrigeration system according to claim 1, characterized in that, The bypass inlet pipe (40) and / or the bypass outlet pipe (42) are equipped with bypass valves (43).

8. The lithium bromide refrigeration system according to claim 7, characterized in that, The bypass outlet pipe (42) has a bypass valve (43) located near its own inlet and outlet ends.

9. The lithium bromide refrigeration system according to claim 7, characterized in that, The inlet pipe (10) is equipped with an inlet valve (11), which is located upstream of the outlet end of the bypass outlet pipe (42).

10. The lithium bromide refrigeration system according to claim 1, characterized in that, The water outlet pipe (30) is equipped with a water outlet valve (31), which is located upstream of the water inlet end of the bypass water inlet pipe (40).

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