CN114543388A - Refrigerating device waste heat recovery device and refrigerating device waste heat recovery system - Google Patents

Abstract

The invention relates to the field of heat recovery, in particular to a waste heat recovery device of a refrigeration device and a waste heat recovery system of the refrigeration device. The waste heat recovery system of the refrigeration device includes a refrigeration device, and the refrigeration device includes a main compressor, a condenser, a liquid accumulator and an evaporator, Between the main compressor and the condenser, a main condensing circuit and a main heat recovery branch are arranged, and a main heat exchanger is arranged on the main heat recovery branch; an auxiliary heat recovery branch is connected downstream of the main compressor, and the auxiliary heat An auxiliary heat exchanger is arranged on the recovery branch; the waste heat recovery system of the refrigeration device also includes a heat exchange pipeline, and the main heat exchanger and the auxiliary heat exchanger are both arranged on the heat exchange pipeline; the waste heat recovery system of the refrigeration device has a single refrigeration mode, a first The first heat recovery mode, the second heat recovery mode and the third heat recovery mode, the setting of the four modes enables the waste heat recovery system of the refrigeration unit to adapt to the heat demand under various conditions, and solves the existence of working modes in the existing heat recovery system. Fewer and narrower issues.

Description

A waste heat recovery device of a refrigeration device and a waste heat recovery system of a refrigeration device

technical field

The invention relates to the field of heat recovery, in particular to a waste heat recovery device of a refrigeration device and a waste heat recovery system of a refrigeration device.

Background technique

Frozen food usually refers to being cooled in a freezer to a temperature of no higher than -15°C, and then placed in a low-temperature storage room of -18°C (also known as a low-temperature freezer, a freezer for frozen objects) for long-term storage to maintain the food's quality. quality. Defrost is required if frozen food is used for reprocessing. At present, the commonly used thawing methods for large batches of frozen food include air thawing, water thawing, vacuum low temperature thawing, etc., and the former two methods are the most common.

Air thawing includes low temperature and high humidity air thawing (the thawing room temperature is about 15°C, relative humidity is 95% to 98%, and the wind speed is about 2m/s), high temperature and high humidity air thawing (the thawing room temperature is 25 to 37°C, relative to The humidity is 95% to 98%, and the wind speed is about 2m/s). When the core temperature of the frozen food rises to 4°C, the thawing is completed. The heat required by the air thawing method for thawing frozen food is usually provided by burning natural gas to generate high-temperature steam or hot water. In summer, although the outside air can be used as a heat source to provide heat for the thawing chamber, the most economical method is to directly introduce the air outside the thawing chamber into the thawing chamber, but it is difficult to guarantee the hygienic conditions of the food in this case. If measures such as filtering and sterilizing the outside air are used to meet the requirements of safety and hygiene, the cost of thawing will increase. Furthermore, in the transitional season and winter, the ambient temperature is low, and it is difficult or impossible for the outdoor air in the Central Plains and the north of my country to provide the heat required for thawing. Water freezing includes static water freezing and flowing water freezing. The temperature of the water is about 10°C. When the core temperature of the frozen food rises to 4°C, the thawing is completed. Similar to air thawing, whether it is static water freezing or fluid water freezing, heat is also provided for the heat exchange medium (air is the heat exchange medium in the air thawing method, and water is the heat exchange medium in the thawing method). At present, the heat required for food thawing is often provided by hot water or hot steam produced by gas boilers. Although burning natural gas to provide heat is simple and easy, there is almost no environmental pollution, but the cost is relatively high.

The Chinese utility model patent with the authorization announcement number CN202993717U discloses a cold storage condensation heat recovery system. The system includes a circulation loop in which a compressor, a condenser, an expansion valve and an evaporator are connected end to end in sequence. The three-way valve is connected in parallel with a pipeline, the pipeline is connected with a condensation heat recovery heat exchanger, and the water outlet of the condensation heat recovery heat exchanger is connected with the air thawing chamber or the forced convection radiator of the forced or heating unit. The compressor, condenser, expansion valve, and evaporator of the cold storage condensing heat recovery system are connected in turn and end to end to form the circulation circuit of the refrigeration device. Recovery branch, the original pipeline between the compressor and the condenser is the main condensation pipeline. The system can use the condensation heat of the refrigeration device to thaw the frozen products through the heat exchanger on the main heat recovery branch, which can make full use of However, the system does not take into account the transitional season and winter, because the load of the refrigeration device is small, the condensation heat of the refrigeration device is often less at this time, and the heat recovered by the condensation heat is usually not enough. Heat required to thaw. Moreover, when the peak season of cold storage (that is, when the thawing amount of frozen food is large) is just in the transition season or winter, the heat required for thawing is large, and the contradiction between the condensing heat that can be recovered by the refrigeration device of the cold storage will be more prominent. . To sum up, the existing heat recovery system has few working modes, cannot meet the thawing requirements under various conditions, and has the problem of a narrow scope of application.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a waste heat recovery device for a refrigeration device, which is used to solve the technical problems of the existing heat recovery system that there are fewer working modes and a narrower scope of application. The present invention also provides a refrigeration device waste heat recovery system including the above refrigeration device waste heat recovery device.

The technical scheme of the waste heat recovery system of the refrigeration device of the present invention is:

The waste heat recovery system of the refrigeration unit includes a refrigeration unit. The refrigeration unit includes a main compressor, a condenser, a liquid accumulator and an evaporator. The main compressor, the condenser, the liquid accumulator and the evaporator are connected in series, and the main compressor and the condenser are arranged between There are a main condensing circuit and a main heat recovery branch. The main condensing circuit is connected in parallel with the main heat recovery branch. The main heat recovery branch is provided with a main heat exchanger; Pipeline valve, the main heat recovery branch is provided with a heat recovery valve that controls the on-off of the main heat recovery branch, or a reversing valve is arranged downstream of the main compressor, and the reversing valve is used to connect the main condensing pipeline and the main heat recovery circuit. One of the receiving and branch circuits is communicated with the main compressor; the downstream of the main compressor is connected with an auxiliary heat recovery branch, and an auxiliary compressor, an auxiliary heat exchanger and a control auxiliary heat recovery branch are arranged on the auxiliary heat recovery branch. On-off branch valve; the auxiliary heat recovery branch is connected in parallel with the main heat recovery branch, and the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the accumulator or the auxiliary heat recovery branch The downstream end is connected to the liquid accumulator; the waste heat recovery system of the refrigeration device also includes a heat exchange pipeline, and the heat exchange pipeline is provided with a heat dissipation device that transfers heat to the heat-using area, and the main heat exchanger and the auxiliary heat exchanger are both arranged in the heat exchange pipeline. On the heat pipeline; the waste heat recovery system of the refrigeration device has a single cooling mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode;

When the waste heat recovery system of the refrigeration unit is in the single refrigeration mode, the main compressor is connected to the condenser and disconnected from the main heat exchanger and the auxiliary heat exchanger, and neither the main heat exchanger nor the auxiliary heat exchanger works;

When the waste heat recovery system of the refrigeration unit is in the first heat recovery mode, the main compressor is connected to the main heat exchanger and disconnected from the condenser and the auxiliary heat exchanger, and the main heat exchanger works;

When the waste heat recovery system of the refrigeration unit is in the second heat recovery mode, the main compressor is communicated with the condenser and communicated with the auxiliary heat exchanger, and is disconnected from the main heat exchanger, and the auxiliary heat exchanger works;

When the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the main compressor communicates with the main heat exchanger and the auxiliary heat exchanger, and is disconnected from the condenser, and both the auxiliary heat exchanger and the main heat exchanger work.

Beneficial effects: When the waste heat recovery system of the refrigeration unit is in the single cooling mode, the condensing line valve is opened, the heat recovery valve and the branch valve are closed, or the reversing valve is connected to the main compressor and the condenser, and the branch valve is closed. The device operates normally, and neither the main heat exchanger nor the auxiliary heat exchanger work; when it is necessary to transfer heat to the heat-consuming area and the heat transferred by the refrigerant during normal operation of the refrigeration unit can meet the requirements of the heat-consuming area, the waste heat recovery system of the refrigeration unit In the first heat recovery mode, the condensing line valve and the branch valve are closed, the heat recovery valve is opened, or the reversing valve conducts the main compressor and the main heat exchanger, and the branch valve is closed, which ensures the normal operation of the refrigeration device at the same time. , the main heat exchanger is also in working state, the medium in the heat exchange pipeline will be heated, and when the medium in the heat exchange pipeline flows through the heat dissipation device, it will transfer heat to the heat-using area through the heat-dissipating device to heat the heat-using area. ; When it is necessary to transfer heat to the heat-using area, the heat transferred by the refrigerant during the normal operation of the refrigeration device cannot meet the requirements of the heat-using area, and the condensing pressure of the refrigeration device is low, the waste heat recovery system of the refrigeration device is in the second heat recovery mode, The condensing line valve and branch valve are opened, the heat recovery valve is closed, or the reversing valve is connected to the main compressor and the condenser, the branch valve is opened, and part of the refrigerant in the refrigeration unit flows to the main condensing circuit to ensure the normal operation of the refrigeration unit. During operation, the other part flows to the auxiliary heat recovery branch. The refrigerant flowing to the auxiliary heat recovery branch is further compressed by the auxiliary compressor and then flows to the auxiliary heat exchanger. After being compressed by the auxiliary compressor, the refrigerant passes through the auxiliary heat exchanger. At the same time, it can transfer more heat to the medium in the heat exchange pipeline. After the medium in the heat exchange pipeline is heated, it will transfer heat to the heat-using area through the heat-dissipating device to heat the heat-using area; when needed For the heat transfer in the heat-consuming area, the heat transferred by the refrigerant when the refrigeration unit is operating normally cannot meet the requirements of the heat-consuming area, and when the condensing pressure of the refrigeration unit is normal, the waste heat recovery system of the refrigeration unit is in the third heat recovery mode, and the heat recovery valve, The bypass valve is opened, the condensing line valve is closed, or the reversing valve is connected to the main compressor and the main heat exchanger, the bypass valve is opened, and part of the refrigerant in the refrigeration device flows to the condenser through the main heat recovery branch to ensure that During the normal operation of the refrigeration device, the other part flows to the auxiliary heat recovery branch, and the refrigerant flowing to the auxiliary heat recovery branch will be further compressed by the auxiliary compressor. The medium in the pipeline is heated after flowing through the main heat exchanger and the auxiliary heat exchanger. After the medium in the heat exchange pipeline is heated, it will transfer heat to the hot area through the heat sink to heat the hot area. The waste heat recovery system of the refrigeration device of the present invention enables the waste heat recovery system of the refrigeration device to adapt to the heat demand under various conditions through the setting of the above four modes, and solves the problem that the existing heat recovery system has fewer working modes and a wider application range. narrow question.

Further, the heat exchange pipeline includes a main heat exchange pipeline and an auxiliary heat exchange branch, the main heat exchanger is arranged on the main heat exchange pipeline, and the main heat exchange pipeline includes a control section downstream of the main heat exchanger, and a useful For the main heat exchange valve that controls the on-off of the control section, the auxiliary heat exchange branch is connected in parallel with the control section.

Beneficial effects: The heat exchange pipeline adopts this arrangement, so that the auxiliary heat exchange branch and the main heat exchange pipeline can be selected in series according to the needs, the arrangement of the pipeline is simplified, and the working mode is more flexible.

Further, an auxiliary heat exchange valve for controlling the on-off of the auxiliary heat exchange branch is provided on the auxiliary heat exchange branch.

Beneficial effects: the setting of the auxiliary heat exchange valve enables more flexible control of the heat exchange pipeline.

Further, an auxiliary branch throttling mechanism is provided on the auxiliary heat recovery branch downstream of the auxiliary heat exchanger.

Beneficial effect: The setting of the auxiliary branch throttling mechanism can control the condensation pressure of the refrigerant in the auxiliary heat recovery branch to the condensation pressure during normal operation of the refrigeration device, so as to reduce the amount of refrigerant flowing through the auxiliary heat recovery branch. The effect of refrigerants on the operation of refrigeration units.

Further, the heat exchange pipeline is a water circuit, and an expansion water tank is arranged on the heat exchange pipeline.

Beneficial effects: the expansion water tank can accommodate the change in the volume of water caused by the temperature change, effectively reducing the probability of the heat exchange pipeline rupture due to excessive water pressure in the heat exchange pipeline.

Further, the waste heat recovery system of the refrigeration device includes a temperature controller for monitoring the temperature of the heat-using area, a temperature control valve is provided on the heat exchange pipeline, and the temperature control valve is used to control the on-off of the heat exchange pipeline. to the temperature to control the opening and closing of the temperature control valve.

Beneficial effects: the setting of the temperature controller and the temperature control valve can monitor the temperature of the heating area in real time, and can control the opening or closing of the temperature control valve according to the temperature of the heating area to control the on-off of the heat exchange pipeline, so as to control the on-off of the heat exchange pipeline. The real-time adjustment of the temperature of the hot area can realize precise control of the temperature of the hot area.

Further, the heat exchange pipeline is provided with a manual control valve for controlling the on-off of the heat exchange pipeline.

Beneficial effects: after the temperature control valve fails, the heat exchange pipeline can be manually controlled by the manual control valve, and the safety factor is high.

Further, when the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the auxiliary heat exchanger is located downstream of the main heat exchanger on the heat exchange pipeline.

Beneficial effects: The temperature of the refrigerant after secondary compression by the auxiliary compressor is higher, and after passing through the auxiliary heat exchanger, the heat can be quickly transferred to the medium passing through the main heat exchanger in the heat exchange pipeline, and the heat transfer efficiency is improved. Guarantees the supply of heat required for the hot area.

The technical scheme of the waste heat recovery device of the refrigeration device of the present invention is:

The waste heat recovery device of the refrigeration device includes a refrigeration device, and the refrigeration device includes a main compressor, a condenser, a liquid accumulator and an evaporator. The main compressor, the condenser, the liquid accumulator and the evaporator are connected in series, and the main compressor and the condenser are arranged between There are a main condensing circuit and a main heat recovery branch. The main condensing circuit is connected in parallel with the main heat recovery branch. The main heat recovery branch is provided with a main heat exchanger; Pipeline valve, the main heat recovery branch is provided with a heat recovery valve that controls the on-off of the main heat recovery branch, or a reversing valve is arranged downstream of the main compressor, and the reversing valve is used to connect the main condensing pipeline and the main heat recovery circuit. One of the receiving and branch circuits is communicated with the main compressor; the downstream of the main compressor is connected with an auxiliary heat recovery branch, and an auxiliary compressor, an auxiliary heat exchanger and a control auxiliary heat recovery branch are arranged on the auxiliary heat recovery branch. On-off branch valve; the auxiliary heat recovery branch is connected in parallel with the main heat recovery branch, and the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the accumulator or the auxiliary heat recovery branch The downstream end is connected to the liquid accumulator; the waste heat recovery device of the refrigeration device has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode;

When the waste heat recovery device of the refrigeration unit is in the single refrigeration mode, the main compressor is connected to the condenser and disconnected from the main heat exchanger and the auxiliary heat exchanger, and neither the main heat exchanger nor the auxiliary heat exchanger work;

When the waste heat recovery device of the refrigeration unit is in the first heat recovery mode, the main compressor is connected to the main heat exchanger and disconnected from the condenser and the auxiliary heat exchanger, and the main heat exchanger works;

When the waste heat recovery device of the refrigeration device is in the second heat recovery mode, the main compressor is communicated with the condenser and communicated with the auxiliary heat exchanger, and is disconnected from the main heat exchanger, and the auxiliary heat exchanger works;

When the waste heat recovery device of the refrigeration device is in the third heat recovery mode, the main compressor communicates with the main heat exchanger and the auxiliary heat exchanger, and is disconnected from the condenser, and both the auxiliary heat exchanger and the main heat exchanger work.

Beneficial effect: When the waste heat recovery device of the refrigeration device is in the single refrigeration mode, the condensing line valve is opened, the heat recovery valve and the branch valve are closed, or the reversing valve conducts the main compressor and the condenser, and the branch valve is closed. The device operates normally, and neither the main heat exchanger nor the auxiliary heat exchanger work; when it is necessary to transfer heat to the heat-consuming area and the heat transferred by the refrigerant during normal operation of the refrigeration device can meet the requirements of the heat-consuming area, the waste heat recovery device of the refrigeration device In the first heat recovery mode, the condensing line valve and the branch valve are closed, the heat recovery valve is opened, or the reversing valve conducts the main compressor and the main heat exchanger, and the branch valve is closed, which ensures the normal operation of the refrigeration device at the same time. , the main heat exchanger is also in working state, and the waste heat recovery device of the refrigeration device can transfer heat to the place where heat is needed through the main heat exchanger; when it is necessary to transfer heat to the heat-using area, the heat transferred by the refrigerant when the refrigeration device is in normal operation cannot be transferred. When the requirements of the heat-using area are met and the condensation pressure of the refrigeration unit is low, the waste heat recovery unit of the refrigeration unit is in the second heat recovery mode, the condensing line valve and branch valve are opened, the heat recovery valve is closed, or the reversing valve is turned on The main compressor and condenser, the branch valve is opened, part of the refrigerant in the refrigeration device flows to the main condensing circuit to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch, which flows to the auxiliary heat recovery branch for refrigeration. After the refrigerant is further compressed by the auxiliary compressor, it will flow to the auxiliary heat exchanger. When the refrigerant is compressed by the auxiliary compressor and passes through the auxiliary heat exchanger, it can transfer more heat to the place where heat is needed. The waste heat recovery device of the refrigeration device can pass through the auxiliary heat exchanger. The auxiliary heat exchanger transfers heat to the place that needs heat; when it is necessary to transfer heat to the heat-consuming area, the heat transferred by the refrigerant cannot meet the requirements of the heat-consuming area when the refrigeration unit is operating normally, and the condensing pressure of the refrigeration unit is normal. The waste heat recovery device of the device is in the third heat recovery mode, the heat recovery valve and the branch valve are opened, the condensing line valve is closed, or the reversing valve is connected to the main compressor and the main heat exchanger, the branch valve is opened, and the Part of the refrigerant flows to the condenser through the main heat recovery branch to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch. The refrigerant flowing to the auxiliary heat recovery branch will be further compressed by the auxiliary compressor. Both the heat exchanger and the auxiliary heat exchanger are in working state, and the waste heat recovery device of the refrigeration unit can transfer heat to the place where heat is needed through the main heat exchanger and the auxiliary heat exchanger. The waste heat recovery device of the refrigeration device of the present invention enables the waste heat recovery device of the refrigeration device to adapt to the heat demand under various conditions through the setting of the above four modes, and solves the problem that the existing heat recovery system has fewer working modes and a wider application range. narrow question.

Further, an auxiliary branch throttling mechanism is provided on the auxiliary heat recovery branch downstream of the auxiliary heat exchanger.

Beneficial effect: The setting of the auxiliary branch throttling mechanism can control the condensation pressure of the refrigerant in the auxiliary heat recovery branch to the condensation pressure during normal operation of the refrigeration device, so as to reduce the amount of refrigerant flowing through the auxiliary heat recovery branch. The effect of refrigerants on the operation of refrigeration units.

Description of drawings

Fig. 1 is the schematic diagram when adopting the air thawing method to thaw frozen food in Embodiment 1 of the waste heat recovery system of the refrigeration device of the present invention;

FIG. 2 is a schematic diagram of the frozen food being thawed by the flow-water freezing method in Embodiment 7 of the waste heat recovery system of the refrigeration device of the present invention.

Description of reference numerals: 1. Heat exchange pipeline; 2. Defrost chamber; 3. Main compressor; 4. Condenser; 5. Liquid accumulator; 6. Evaporator; Food; 9. Main condensing line; 10. Condensing line valve; 11. Main heat recovery branch; 12. Main heat exchanger; 13. Heat recovery valve; 14. Auxiliary heat recovery branch; 15. Branch Valve; 16, auxiliary compressor; 17, auxiliary heat exchanger; 18, auxiliary branch throttling mechanism; 19, main heat exchange circuit; 20, auxiliary heat exchange branch; 21, control section; 22, main heat exchange valve 23, auxiliary heat exchange valve; 24, cooling device; 25, humidifier; 26, temperature control valve; 27, expansion tank; 28, manual control valve; 29, thawing pool; 30, agitator.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that, in the specific implementation of the present invention, terms that may appear, such as “first” and “second” and other relational terms are only used to distinguish one entity or operation from another entity or operation , and does not necessarily require or imply that such an actual relationship or order exists between these entities or operations. Furthermore, terms such as "comprising", "comprising" or any other variation thereof that may appear are intended to encompass a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also Other elements not expressly listed or inherent to such a process, method, article or apparatus are also included. Without further limitation, the appearance of the phrase "comprising a..." etc. qualifying elements does not preclude the presence of additional identical elements in the process, method, article or device that includes the element.

In the description of the present invention, unless otherwise expressly specified and limited, terms that may appear such as "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

In the description of the present invention, unless otherwise expressly specified and limited, the term "provided" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body or a separate body from the body. Arranged and connected on the body, the connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

The present invention will be further described in detail below with reference to the embodiments.

Embodiment 1 of the refrigeration plant waste heat recovery system provided in the present invention:

As shown in Figure 1, the waste heat recovery system of the refrigeration device includes a waste heat recovery device of the refrigeration device, a heat exchange pipeline 1 and a thawing chamber 2. The waste heat recovery device of the refrigeration device includes a refrigeration device, and the refrigeration device is used to refrigerate the low temperature storehouse, so that the low temperature The warehouse can freeze the food to maintain the quality of the food. The refrigerating device includes a circulation loop consisting of a main compressor 3, a condenser 4, a liquid accumulator 5, and an evaporator 6 in series. There are four main compressors 3 and they are connected in parallel to form a parallel compressor unit. A throttling mechanism 7 of a refrigeration device is arranged between 5 and the evaporator 6, and a refrigerant circulates in the circulation circuit of the refrigeration device. After passing through the condenser 4, the heat is released and it becomes a low-temperature liquid. The refrigerant in the low-temperature liquid state will enter the evaporator 6 after passing through the accumulator 5 and the throttling mechanism 7 of the refrigeration device, and the refrigerant will be absorbed in the evaporator 6. The heat is converted into gas, and the refrigerant in the gas state re-enters the main compressor 3, and is converted into high-temperature and high-pressure gas under the action of the main compressor 3, and the refrigerant circulates back and forth in the circulation loop of the refrigeration device, so as to Realize the refrigeration function of the refrigeration device. The structure and working principle of the refrigerating device are in the prior art. Under the premise that the basic working principle remains unchanged, the structure of the refrigerating device can be adjusted appropriately. refrigeration unit.

The waste heat recovery system of the refrigeration device of the present invention makes full use of the heat of the refrigerant in a high temperature and high pressure gas state to heat the medium in the heat exchange pipe 1, and then uses the heat exchange pipe 1 to transfer heat to the heat-using area, In this embodiment, the thawing chamber 2 is the heat-using area, and the heat exchange pipeline 1 transfers heat to the thawing chamber 2 to thaw the frozen food 8 in the thawing chamber 2 .

The pipeline between the parallel compressor unit of the refrigeration device and the condenser 4 is the condensing main pipeline 9. The condensing main pipeline 9 is connected in series with the condensing pipeline valve 10 for on-off of the condensing pipeline, and the condensing main pipeline 9 is connected in parallel with the main heat return pipeline. The main heat recovery branch 11 and the main heat recovery branch 11 are connected in series with the main heat exchanger 12 and the heat recovery valve 13 which controls the on-off of the main heat recovery branch 11 . In addition, an auxiliary heat recovery branch 14 is connected downstream of the main compressor 3, the upstream end of the auxiliary heat recovery branch 14 is connected to the compressor parallel unit, and the downstream end of the auxiliary heat recovery branch 14 is connected to the accumulator 5 connections. A branch valve 15 , an auxiliary compressor 16 , an auxiliary heat exchanger 17 and an auxiliary branch throttling mechanism 18 are sequentially connected in series on the auxiliary heat recovery branch 14 . The main heat exchanger 12 and the auxiliary heat exchanger 17 are common structures in the prior art, and the specific structures will not be repeated. When the refrigerant in the high temperature and high pressure gas state flows through the main heat recovery branch 11, the main heat exchanger 12 It is used to transfer the heat of the refrigerant to the medium in the heat exchange pipeline 1. When the refrigerant in a high temperature and high pressure gas state flows through the auxiliary heat recovery branch 14, the auxiliary heat exchanger 17 is used to transfer the heat of the refrigerant. Transferred to the medium in the heat exchange pipeline 1.

The heat exchange pipeline 1 includes a main heat exchange pipeline 19, the main heat exchanger 12 is connected in series on the main heat exchange pipeline 19, and the main heat exchange pipeline 19 downstream of the main heat exchanger 12 is connected in parallel with an auxiliary heat exchange branch 20, The auxiliary heat exchanger 17 is connected in series with the auxiliary heat exchange branch 20, and the auxiliary heat exchange branch 20 is also connected in series with an auxiliary heat exchange valve 23 for controlling the opening and closing of the auxiliary heat exchange branch 20. The pipeline section connected in parallel with the hot branch 20 is the control section 21 , and a main heat exchange valve 22 is connected in series with the control section 21 , and the main heat exchange valve 22 is used to control the on-off of the control section 21 . In this embodiment, the heat exchange pipe 1 is a water circuit, and the medium flowing in the heat exchange loop is water. In other embodiments, the heat exchange pipe can also be an air circuit, and the medium flowing in the heat exchange pipe is gas.

The heat exchange pipe 1 is connected in series with a heat dissipation device 24. When the water in the heat exchange pipe 1 is heated and flows through the heat dissipation device 24, the heat dissipation device 24 will transfer heat to the air in the defrosting chamber 2 to cool the air in the defrosting chamber 2. The air is heated, and the air in the defrosting chamber 2 transfers the heat to the frozen food 8 to defrost the frozen food 8 . In the embodiment, the heat dissipation device 24 is a heat exchanger, and in other embodiments, the heat dissipation device may also be a device capable of transferring heat to the outside, such as a heat sink.

The waste heat recovery system of the refrigeration device of the present invention has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode.

When the frozen food 8 does not need to be thawed, the waste heat recovery system of the refrigeration device is in a single refrigeration mode. The condensing line valve 10 is opened, the heat recovery valve 13 and the branch valve 15 are closed, that is, the main compressor 3 is communicated with the condenser 4, and is disconnected from the main heat exchanger 12 and the auxiliary heat exchanger 17, and the main heat exchanger 12 Both the auxiliary heat exchanger 17 and the auxiliary heat exchanger 17 do not work, and each valve on the heat exchange pipeline 1 is in a closed state. At this time, the refrigeration device operates normally to cool the low-temperature storehouse.

When the frozen food 8 needs to be thawed, and the refrigeration device is operating normally, and the heat of the refrigerant in the high-temperature and high-pressure gas state can meet the heat required for thawing the frozen food 8, the waste heat recovery system of the refrigeration device is in the first heat recovery mode, and the condensation pipeline is in the first heat recovery mode. The valve 10 and the branch valve 15 are closed, and the heat recovery valve 13 is opened, that is, the main compressor 3 is communicated with the main heat exchanger 12, and is disconnected from the condenser 4 and the auxiliary heat exchanger 17, the main heat exchanger 12 works, and the exchange The main heat exchange valve 22 on the heat pipe 1 is opened, and the auxiliary heat exchange valve 23 is closed. The refrigerant in the high-temperature and high-pressure gas state in the refrigeration device will flow to the condenser 4 through the main heat recovery branch 11, which ensures that the main heat exchanger 12 on the main heat recovery branch 11 is in the normal operation of the refrigeration device at the same time. In the working state, the water in the heat exchange pipe 1 will be heated, and when the water in the heat exchange pipe 1 flows through the heat dissipation device 24, it will transfer heat to the air in the defrosting chamber 2 through the heat dissipation device 24, so as to cool the air in the defrosting chamber 2. The air is heated, and the frozen food 8 is thawed.

When the frozen food 8 needs to be thawed, the refrigeration device is operating normally, and the heat of the refrigerant in the high-temperature and high-pressure gas state cannot meet the heat required for thawing the frozen food 8 (for example, in winter or transitional seasons, the load of the refrigeration device is small, and in this case The heat of the refrigerant in the high-temperature and high-pressure gas state cannot meet the heat required for thawing the frozen food 8), and when the condensing pressure of the refrigeration device is low (the condensing pressure is lower than 8 bar), the waste heat recovery system of the refrigeration device is in the second heat recovery system. In the mode, the condensing line valve 10 and the branch valve 15 are opened, and the heat recovery valve 13 is closed, that is, the main compressor 3 communicates with the condenser 4 and the auxiliary heat exchanger 17, and is disconnected from the main heat exchanger 12. The heat exchanger 17 works, the main heat exchange valve 22 on the heat exchange pipeline 1 is closed, and the auxiliary heat exchange valve 23 is opened. A part of the refrigerant in the high temperature and high pressure gas state in the refrigeration device flows to the main condensing pipeline 9 to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch 14, and the refrigerant flowing to the auxiliary heat recovery branch 14 is in a high temperature and high pressure gas state. After being further compressed by the auxiliary compressor 16, the refrigerant will flow to the auxiliary heat exchanger 17. After being compressed by the auxiliary compressor 16 and passing through the auxiliary heat exchanger 17, the refrigerant can transfer more water to the water in the heat exchange pipeline 1. heat. After the water in the heat exchange pipeline 1 is heated and passes through the radiator 24, heat will be transferred to the air in the defrosting chamber 2 through the radiating device 24 to heat the air in the defrosting chamber 2, and then the frozen food 8 is thawed.

When the frozen food 8 needs to be thawed, the refrigeration device is operating normally, and the heat of the refrigerant in the high-temperature and high-pressure gas state cannot meet the heat required for thawing the frozen food 8 (for example, in winter or transitional seasons, the load of the refrigeration device is small, and in this case The heat of the refrigerant in the high-temperature and high-pressure gas state cannot meet the heat required for the thawing of the frozen food 8), and when the condensing pressure of the refrigeration device is normal (the condensing pressure is higher than 8 bar), the waste heat recovery system of the refrigeration device is in the third heat recovery mode , the heat recovery valve 13 and the branch valve 15 are opened, and the condensing line valve 10 is closed, that is, the main compressor 3 communicates with the main heat exchanger 12 and the auxiliary heat exchanger 17, and is disconnected from the condenser 4. Both the heat exchanger 17 and the main heat exchanger 12 work, the main heat exchange valve 22 on the heat exchange pipeline 1 is closed, and the auxiliary heat exchange valve 23 is opened. A part of the refrigerant in the high temperature and high pressure gas state in the refrigeration device flows to the condenser 4 through the main heat recovery branch 11 to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch 14, which flows to the auxiliary heat recovery branch. The refrigerant in the high temperature and high pressure gas state of 14 will be further compressed by the auxiliary compressor 16, the main heat exchanger 12 and the auxiliary heat exchanger 17 are both in working state, and the water in the heat exchange pipeline 1 flows through the main heat exchanger 12 in turn. After being heated with the auxiliary heat exchanger 17, the water in the heat exchange pipeline 1 will be heated to transfer heat to the air in the defrosting chamber 2 through the heat sink 24, so as to heat the air in the defrosting chamber 2, and then freeze the food 8 thawed.

The waste heat recovery system of the refrigeration device of the present invention can apply the heat recovery of the refrigerant in the high temperature and high pressure gas state to the thawing of food through the setting of the above four modes, thereby reducing the environmental "heat pollution" and reducing the consumption of energy such as burning natural gas. The effect of energy saving and emission reduction is remarkable. In addition, the waste heat recovery system of the refrigeration device of the present invention comprehensively considers various matching situations between the heat of the refrigerant in the high temperature and high pressure gas state and the heat required for thawing in different seasons, and adopts targeted solutions for different situations, so that the refrigeration The plant waste heat recovery system can operate all season.

It should be noted that, in this embodiment, the thawing chamber 2 uses the air thawing method to thaw the frozen food 8. In order to better thaw the frozen food 8, a humidity controller (for the humidity controller) is provided in the thawing chamber 2. In the monitoring diagram, the humidity at C in the thawing chamber 2) and the humidifier 25, the humidity controller is used to monitor the humidity in the thawing chamber 2 and control the opening and closing of the humidifier 25. When the humidity in the thawing chamber 2 is lower than 95% When the humidity controller controls the humidifier 25 to turn on, the humidifier 25 will humidify the air in the thawing chamber 2. When the humidity in the thawing chamber 2 reaches 98%, the humidity controller controls the humidifier 25 to turn off. The heat exchange pipeline 1 is also connected with a temperature controller (the temperature controller is used to monitor the temperature at A in the thawing chamber 2 in the figure). Correspondingly, a temperature control valve 26 is connected in series on the heat exchange pipeline 1, and the temperature controller is used for The temperature in the defrosting chamber 2 is monitored and the opening and closing of the temperature control valve 26 is controlled according to the monitored temperature. When the temperature in the thawing chamber 2 is lower than 13°, the temperature controller controls the temperature control valve 26 to keep the open state, and the heat sink 24 can continuously transfer heat to the thawing chamber 2. When the temperature of the thawing chamber 2 reaches 15°, the temperature The controller controls the temperature control valve 26 to close, and the heat dissipation device 24 stops transferring heat into the thawing chamber 2 .

In addition, the frozen food 8 is provided with a temperature sensor (B in the figure), and the temperature sensor is used to monitor the temperature of the frozen food 8 . In this embodiment, the humidity controller, the temperature controller, the temperature sensor and the above-mentioned various valves are all controlled by the PLC system, and the PLC system determines that the waste heat recovery system of the refrigeration device is in a mode according to the heating rate of the frozen food 8 If the heating rate of the frozen food is too slow, it is determined that the waste heat recovery system of the refrigeration device cannot meet the thawing demand in this mode, and the PLC system will control the valve to switch the mode of the waste heat recovery system of the refrigeration device to make The waste heat recovery system of the refrigeration unit can meet the defrosting needs.

More specifically, a manual control valve 28 is also connected in series on the heat exchange pipeline 1. Correspondingly, a thermometer is provided in the defrosting chamber 2. When the temperature control valve 26 fails, the manual control valve 28 can be manually controlled according to the temperature displayed by the thermometer. The control valve 28 manually controls the on-off of the heat exchange pipeline 1 .

In this embodiment, since the heat exchange pipeline 1 is a water circuit, an expansion water tank 27 is connected to the loop pipeline. The expansion water tank 27 is used for accommodating the volume change of the water caused by the temperature change, effectively reducing the heat exchange caused by the heat exchange. Excessive water pressure in the pipeline leads to the probability of rupture of the heat exchange pipeline. The expansion tank 27 is a common technology in the prior art, and its specific structure will not be repeated here. It should be noted that the water cycle in the heat exchange pipeline 1 is a gravity cycle, that is, the water in the heat exchange pipeline 1 is heated by the main heat exchanger 12 and the auxiliary heat exchanger 17 and formed between the unheated water and the water. The difference in density drives the water to circulate in the heat exchange pipeline 1. The heat exchange pipeline 1 adopts gravity circulation, and there is no other power equipment such as water pumps, and the energy saving effect is good. Of course, in other embodiments, the heat exchange pipeline can use a water pump to drive the water in the heat exchange pipeline to circulate. In addition, in order to speed up the thawing speed of the frozen food 8, in this embodiment, a fan is provided in the thawing chamber 2 to flow air.

The second embodiment of the waste heat recovery system of the refrigeration device of the present invention is different from the first embodiment in that no condensing pipeline valve is set on the main condensing pipeline, and no heat recovery valve is set on the main heat recovery branch. A reversing valve is arranged on the pipeline of the heat exchanger, and the reversing valve connects the main condensing pipeline and the main heat recovery branch. In this embodiment, one of the main condensation pipeline and the main heat recovery branch is controlled by controlling the reversing valve. The compressors are connected in parallel with each other.

Embodiment 3 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 1 in that in this embodiment, the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the accumulator.

Embodiment 4 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 1 in that the heat exchange pipeline only includes the main heat exchange pipeline, and the main heat exchanger and the auxiliary heat exchanger are connected in series in the main heat exchange pipeline.

Embodiment 5 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 1 in that, in this embodiment, no auxiliary heat exchange valve is provided on the auxiliary heat exchange branch, and the auxiliary heat exchange branch always maintains a passage state.

Embodiment 6 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 1 in that no temperature controller is provided in the defrosting chamber, no temperature control valve is provided on the heat exchange pipeline, and a thermometer is provided in the defrosting chamber. In this embodiment, , according to the temperature displayed by the thermometer, the on-off of the heat exchange pipeline is manually controlled by the manual control valve. Or in other embodiments, no manual control valve is provided on the heat exchange pipeline, and the temperature controller is used to monitor the temperature in the thawing chamber, and control the opening and closing of the temperature control valve according to the monitored temperature, thereby controlling the on-off of the heat exchange pipeline. .

Embodiment 7 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 1 in that, as shown in FIG. 2 , the thawing chamber 2 is replaced with a thawing pool 29, and the thawing pool 29 stores water for thawing and freezes food 8 Submerged in the water in the thawing tank 29, the temperature monitored by the temperature controller is the water temperature in the thawing tank 29, and an agitator 30 is provided in the thawing tank 29 to stir the water in the thawing tank 29, so that the water in the thawing tank 29 is stirred. The water is in a flowing circulation state, and the water temperature in the thawing pool 29 is relatively uniform. In this embodiment, the waste heat recovery system of the refrigeration device thaws the frozen food 8 by using the thawing method of flowing water. water is heated.

Embodiment 8 of the refrigeration device waste heat recovery system of the present invention is different from Embodiment 7 in that no stirrer is provided in the thawing tank, so the water in the thawing tank is in a stable state. Food thawing is a thawing method that uses static thawing.

In the embodiment of the waste heat recovery device of the refrigeration device of the present invention, the structure of the waste heat recovery device of the refrigeration device is the same as the structure of the waste heat recovery device of the refrigeration device in any embodiment of the above refrigeration device waste heat recovery system, and will not be repeated here.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the contents of the description and drawings of the present invention, Similarly, all should be included in the protection scope of the present invention.

Claims (10)

1. A waste heat recovery system of a refrigeration device, comprising a refrigeration device, the refrigeration device comprising a main compressor (3), a condenser (4), a liquid accumulator (5) and an evaporator (6), the main compressor (3), The condenser (4), the liquid accumulator (5) and the evaporator (6) are connected in series, and the main condenser (9) and the main heat recovery branch (9) are arranged between the main compressor (3) and the condenser (4). 11), the main condensing line (9) is connected in parallel with the main heat recovery branch (11), and the main heat recovery branch (11) is provided with a main heat exchanger (12); A condensing line valve (10) for controlling the on-off of the main condensing line (9), a heat recovery valve (13) for controlling the on-off of the main heat recovery branch (11) is provided on the main heat recovery branch line (11), Or a reversing valve is arranged downstream of the main compressor (3), and the reversing valve is used to make one of the main condensing pipeline (9) and the main heat recovery branch (11) communicate with the main compressor (3); it is characterized by Yes, an auxiliary heat recovery branch (14) is connected downstream of the main compressor (3), and the auxiliary heat recovery branch (14) is provided with an auxiliary compressor (16), an auxiliary heat exchanger (17) and a control A branch valve (15) for on-off of the auxiliary heat recovery branch (14); the auxiliary heat recovery branch (14) is connected in parallel with the main heat recovery branch (11), and the auxiliary heat recovery branch (14) is downstream The end is connected to the pipeline between the condenser (4) and the accumulator (5) or the downstream end of the auxiliary heat recovery branch (14) is connected to the accumulator (5); The heat pipe (1), the heat exchange pipe (1) is provided with a heat dissipation device (24) for transferring heat to the heat-using area, and the main heat exchanger (12) and the auxiliary heat exchanger (17) are both arranged in the heat exchange area. On the pipeline (1); the waste heat recovery system of the refrigeration device has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode; When the waste heat recovery system of the refrigeration unit is in the single refrigeration mode, the main compressor (3) communicates with the condenser (4) and is disconnected from the main heat exchanger (12) and the auxiliary heat exchanger (17), and the main heat exchanger ( 12) and the auxiliary heat exchanger (17) do not work; When the waste heat recovery system of the refrigeration device is in the first heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12) and is disconnected from the condenser (4) and the auxiliary heat exchanger (17), and the main heat exchanger (17) is disconnected. device (12) works; When the waste heat recovery system of the refrigeration unit is in the second heat recovery mode, the main compressor (3) communicates with the condenser (4) and communicates with the auxiliary heat exchanger (17), and is disconnected from the main heat exchanger (12), and the auxiliary The heat exchanger (17) works; When the waste heat recovery system of the refrigeration unit is in the third heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12) and the auxiliary heat exchanger (17), and is disconnected from the condenser (4), and the auxiliary Both the heat exchanger (17) and the main heat exchanger (12) work. 2. The waste heat recovery system of a refrigeration device according to claim 1, wherein the heat exchange pipeline (1) comprises a main heat exchange pipeline (19) and an auxiliary heat exchange branch (20), and the main heat exchanger (12) ) is arranged on the main heat exchange circuit (19), the main heat exchange circuit (19) includes a control section (21) downstream of the main heat exchanger (12), and the control section (21) is provided with a control section (21) for controlling ) on-off main heat exchange valve (22), auxiliary heat exchange branch (20) is connected in parallel with the control section (21). 3. The waste heat recovery system of a refrigeration device according to claim 2, wherein the auxiliary heat exchange branch (20) is provided with an auxiliary heat exchange valve (23) for controlling the on-off of the auxiliary heat exchange branch (20) . 4. The waste heat recovery system of a refrigeration device according to any one of claims 1-3, wherein the auxiliary heat recovery branch (14) is provided with an auxiliary branch downstream of the auxiliary heat exchanger (17). Throttle mechanism (18). 5 . The waste heat recovery system of a refrigeration device according to claim 1 , wherein the heat exchange pipeline ( 1 ) is a water circuit, and an expansion water tank ( 27 ) is arranged on the heat exchange pipeline ( 1 ). 6 . 6. The waste heat recovery system of a refrigeration device according to any one of claims 1 to 3, wherein the waste heat recovery system of the refrigeration device comprises a temperature controller for monitoring the temperature of the heating area, and the heat exchange pipeline (1) is on the A temperature control valve (26) is provided, the temperature control valve (26) is used to control the on-off of the heat exchange pipeline (1), and the temperature controller controls the opening and closing of the temperature control valve (26) according to the monitored temperature. 7 . The waste heat recovery system of a refrigeration device according to claim 6 , wherein the heat exchange pipeline ( 1 ) is provided with a manual control valve ( 28 ) for controlling the on-off of the heat exchange pipeline ( 1 ). 8 . 8. The waste heat recovery system of a refrigeration device according to any one of claims 1-3, characterized in that, when the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the auxiliary heat exchanger (17) is in the heat exchange pipeline (17). 1) is downstream of the main heat exchanger (12). 9. A waste heat recovery device of a refrigeration device, including a refrigeration device, the refrigeration device includes a main compressor (3), a condenser (4), a liquid accumulator (5) and an evaporator (6), a main compressor (3), a condenser (4), the liquid accumulator (5) and the evaporator (6) are connected in series, and the main condenser circuit (9) and the main heat recovery branch circuit (11) are arranged between the main compressor (3) and the condenser (4). , the main condensing circuit (9) is connected in parallel with the main heat recovery branch (11), and the main heat recovery branch (11) is provided with a main heat exchanger (12); the main condensing circuit (9) is provided with a control condensation The condensing line valve (10) for on-off of the main line (9), the main heat recovery branch (11) is provided with a heat recovery valve (13) for controlling the on-off of the main heat recovery branch (11), or the main heat recovery branch (11) A reversing valve is arranged downstream of the compressor (3), and the reversing valve is used to make one of the main condensing pipeline (9) and the main heat recovery branch (11) communicate with the main compressor (3); it is characterized in that, An auxiliary heat recovery branch (14) is connected downstream of the main compressor (3), and an auxiliary compressor (16), an auxiliary heat exchanger (17) and a control auxiliary heat are arranged on the auxiliary heat recovery branch (14). A branch valve (15) for on-off of the recovery branch (14); the auxiliary heat recovery branch (14) is connected in parallel with the main heat recovery branch (11), and the downstream end of the auxiliary heat recovery branch (14) is connected The pipeline between the condenser (4) and the accumulator (5) or the downstream end of the auxiliary heat recovery branch (14) is connected to the accumulator (5); the waste heat recovery device of the refrigeration device has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode, and a third heat recovery mode; When the waste heat recovery device of the refrigeration device is in the single refrigeration mode, the main compressor (3) communicates with the condenser (4), and is disconnected from the main heat exchanger (12) and the auxiliary heat exchanger (17), and the main heat exchanger ( 12) and the auxiliary heat exchanger (17) do not work; When the waste heat recovery device of the refrigeration device is in the first heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12), and is disconnected from the condenser (4) and the auxiliary heat exchanger (17), and the main heat exchanger (17) is disconnected. device (12) works; When the waste heat recovery device of the refrigeration device is in the second heat recovery mode, the main compressor (3) communicates with the condenser (4) and communicates with the auxiliary heat exchanger (17), and is disconnected from the main heat exchanger (12), and the auxiliary The heat exchanger (17) works; When the waste heat recovery device of the refrigeration device is in the third heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12) and communicates with the auxiliary heat exchanger (17), and is disconnected from the condenser (4), and the auxiliary Both the heat exchanger (17) and the main heat exchanger (12) work. 10. The waste heat recovery device of a refrigeration device according to claim 9, wherein the auxiliary heat recovery branch (14) is provided with an auxiliary branch throttling mechanism (18) downstream of the auxiliary heat exchanger (17). ).

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