Stable freezing device for falling-film evaporator and immersed evaporator

Abstract

The utility model discloses a stable freezing device for a falling-film evaporator and an immersed evaporator, which comprises an ice water tank, a falling-film plate-exchange evaporator and an immersed plate-exchange evaporator, the falling-film plate-exchange evaporator is mounted above a hot water return side of the ice water tank, and the immersed plate-exchange evaporator is mounted above the hot water return side of the ice water tank. And the immersed plate heat exchange evaporator is arranged in a pool on the ice water output side of the ice water pool. The utility model belongs to the technical field of refrigeration, and particularly relates to a stable freezing device for a falling film evaporator and an immersed evaporator.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration, and in particular relates to a stable freezing device for a falling film evaporator and an immersed evaporator. Background Art

[0002] In industries like beer and dairy, the production process requires high volumes of chilled water at relatively high temperatures, typically 1°C ± 0.5°C, close to freezing. Traditionally, large thermosyphon plate evaporators have been used, with refrigerant and chilled water exchanging heat near freezing across the plates. Poor evaporation pressure control can easily lead to ice blockage and expansion on the water side, potentially causing refrigerant leaks. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a stable refrigeration device for a falling film evaporator and an immersed evaporator, which effectively solves the problem of ice blockage and expansion on the water side, which may cause refrigerant leakage.

[0004] In order to achieve the above functions, the technical solution adopted by the present invention is as follows: a stable freezing device with a falling film evaporator and an immersion evaporator, including an ice water pool, a falling film plate exchange evaporator and an immersion plate exchange evaporator, the falling film plate exchange evaporator is installed above the hot water return side of the ice water pool, and the immersion plate exchange evaporator is installed in the pool on the ice water output side of the ice water pool.

[0005] Preferably, an air pump is installed above the ice water pool near the side of the submerged plate exchange evaporator.

[0006] Preferably, an internal circulation pump group is connected between the hot water return side of the ice water pool and the water inlet side of the falling film plate exchange evaporator.

[0007] Preferably, the ice water supply side of the ice water pool is connected to an external circulation pump group.

[0008] Preferably, the submerged plate exchange evaporator is located in the flow direction of the ice water in the ice water pool.

[0009] Preferably, the falling film plate evaporator adopts liquid phase film heat exchange on the refrigerant side.

[0010] Preferably, the refrigerant liquid supply of the falling film plate exchange evaporator and the submerged plate exchange evaporator is provided by a refrigerant pump.

[0011] The utility model adopts the above structure to achieve the following beneficial effects: a stable freezing device is formed by combining a falling film plate evaporator and an immersed plate evaporator. The ice water of the combined device adopts an open system. Since the chilled flowing water is in an open operating state, it is not sensitive to the evaporation temperature. Even if it freezes, it will fall into the ice water pool under the impact of the flow rate to play the role of ice storage. There is no need to consider the impact of the freezing of the chilled water on the evaporator, which avoids the situation of ice blockage in the closed system and completes stable heat exchange with large loads. At the same time, the open flow state on the water side can avoid the safety impact of the ice on the refrigerant side on the water side, and will not block the water channel, thereby ensuring the safe operation of the heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of a stable refrigeration device with a falling film evaporator and an immersion evaporator proposed by the utility model.

[0013] Among them, 1. Internal circulation pump group, 2. Falling film plate exchange evaporator, 3. Ice water pool, 4. Immersed plate exchange evaporator, 5. Air pump, 6. External circulation pump group. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The present invention will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1As shown, the utility model proposes a stable freezing device of a falling film evaporator and an immersion evaporator, comprising an ice water pool 3, a falling film plate exchange evaporator 2 and an immersion plate exchange evaporator 4. The falling film plate exchange evaporator 2 is installed above the hot water return side of the ice water pool 3, and the immersion plate exchange evaporator 4 is installed in the pool on the ice water output side of the ice water pool 3. An air pump 5 is installed above the ice water pool 3 near the immersion plate exchange evaporator 4. The air pump 5 introduces air to stir the flow of ice water in the ice water pool 3, thereby enhancing heat exchange efficiency and reducing the risk of ice water freezing. The ice water outside the immersion plate exchange evaporator 4 is disturbed by the airflow of the air pump 5, thereby enhancing heat exchange and alleviating the freezing phenomenon of the immersion plate exchange evaporator 4.

[0017] An internal circulation pump group 1 is connected between the hot water return side of the ice water pool 3 and the water inlet side of the falling film plate exchange evaporator 2. The hot water returns to the ice water pool 3 from the user side and is mixed with the ice water in the pool. The mixed hot water is transported to the water inlet side of the falling film plate exchange evaporator 2 through the internal circulation pump group 1. The hot water falls in the form of a film along the outer surface of the evaporator. The falling process is cooled by the refrigerant in the plate, completing the film heat exchange and ensuring sufficient heat exchange. The ice water supply side of the ice water pool 3 is connected to the external circulation pump group 6, and is transported to the user end through the external circulation pump group 6.

[0018] In order to ensure the stability of the cold water temperature, the immersed plate exchange evaporator 4 is located in the flow direction of the ice water in the ice water pool 3, further cooling the ice water in the flow direction of the ice water. When the ice water passes through the immersed plate exchanger, the heat is released and the temperature is further reduced. The liquid ammonia inside the plate absorbs heat like the liquid ammonia inside the falling film evaporator and turns into two fluids and returns to the gas-liquid separator.

[0019] The falling film plate exchange evaporator 2 adopts liquid phase film heat exchange on the refrigerant side. The refrigerant supply of the falling film plate exchange evaporator 2 and the submerged plate exchange evaporator 4 both adopts the refrigerant pump supply method. The supply stability is much higher than the thermal siphon gravity supply method, ensuring sufficient heat exchange.

[0020] During specific use, hot water returns to the ice water pool 3 from the user side and mixes with the ice water in the pool. The mixed hot water is transported to the water inlet side of the falling film plate exchanger evaporator 2 through the internal circulation pump group 1. The hot water falls in the form of a film along the outer surface of the evaporator. During the falling process, it is cooled by the refrigerant in the plate, completing the membrane heat exchange and ensuring sufficient heat exchange. On the refrigerant side, the heat of the water is absorbed to cause phase change heat exchange, and part of the refrigerant changes from liquid to gas. Driven by the refrigerant pump, it returns to the gas-liquid separator. The power of the pump ensures sufficient supply of refrigerant, which is more stable than the traditional plate exchanger that relies on gravity difference to achieve circulation.

[0021] The hot water that has been initially cooled by the falling film plate exchange evaporator 2 can basically reach the temperature required by the user. In order to ensure the stability of the cold water temperature, an immersed plate exchange evaporator 4 is set in the flow direction of the ice water in the ice water pool 3. The nominal heat exchange rate is 20% of the total refrigeration load. When the ice water passes through the immersed plate exchange, the heat is released and the temperature is further reduced. The liquid ammonia inside the plate absorbs heat like the liquid ammonia inside the falling film evaporator and turns into two fluids and returns to the gas-liquid separator. The ice water outside the immersed plate exchange evaporator 4 is disturbed by the airflow of the air pump 5, which enhances the heat exchange and alleviates the freezing phenomenon of the immersed plate exchange as much as possible. Finally, it is transported to the user end through the external circulation pump group 6.

[0022] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A stable refrigeration device for a falling film evaporator and an immersion evaporator, characterized in that: The invention comprises an ice water pool (3), a falling film plate exchange evaporator (2) and an immersed plate exchange evaporator (4), wherein the falling film plate exchange evaporator (2) is installed above the hot water return side of the ice water pool (3), and the immersed plate exchange evaporator (4) is installed in the pool on the ice water output side of the ice water pool (3).

2. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 1, characterized in that: An air pump (5) is installed above the ice water pool (3) and close to the side of the submerged plate exchange evaporator (4).

3. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 2, characterized in that: An internal circulation pump group (1) is connected between the hot water return side of the ice water pool (3) and the water inlet side of the falling film plate exchange evaporator (2).

4. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 3, characterized in that: The ice water supply side of the ice water pool (3) is connected to an external circulation pump group (6).

5. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 4, characterized in that: The submerged plate exchange evaporator (4) is located in the flow direction of the ice water in the ice water pool (3).

6. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 5, characterized in that: The falling film plate exchange evaporator (2) adopts liquid phase film heat exchange on the refrigerant side.

7. The stable refrigeration device of a falling film evaporator and a submerged evaporator according to claim 6, characterized in that: The refrigerant liquid supply of the falling film plate exchange evaporator (2) and the submerged plate exchange evaporator (4) both adopts a refrigerant pump liquid supply method.

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