CN111288682A - Refrigeration and cold and heat recovery integrated system and refrigeration and cold and heat recovery integrated utilization method - Google Patents

Abstract

The invention discloses a refrigeration and cold-heat recovery integrated system, which comprises: a cold source and a heat source; the third heat exchanger is connected with the cold source; the refrigerator is connected with the third heat exchanger and forms a loop with the third heat exchanger; the first heat exchanger is connected with the cold source; the first-stage heat exchanger is connected with a heat source, and at least one loop is formed between the first heat exchanger and the first-stage heat exchanger; at least one valve for switching the working state between the first heat exchanger and the third heat exchanger; by applying the refrigeration and cold and heat recovery integrated system, the running state of the system can be flexibly switched, and different refrigeration capacities and different cold medium flow rates can be adapted; the invention also provides a refrigeration and cold and heat recovery comprehensive utilization method.

Description

Refrigeration and cold and heat recovery integrated system and comprehensive utilization method of refrigeration and cold and heat recovery

technical field

The invention relates to the field of medium circulation systems, in particular to a refrigeration and cold and heat recovery integrated system and a refrigeration and cold and heat recovery comprehensive utilization method.

Background technique

In the existing factory production environment, there are many cold sources that need to obtain heat for heating, such as liquefied gas output from low-temperature liquefied gas tanks, and there are also heat sources that carry a lot of heat and need to be recovered, such as boiler cooling water, Boiler exhaust gas, etc.; on the other hand, facilities such as refrigeration systems and dehumidification systems installed in the factory building also consume a lot of energy; various influences make the energy utilization rate of the factory not further improved.

At present, the refrigeration of the factory building mainly relies on the heat pump system installed in the factory building to discharge the heat in the factory building to the outside, which not only consumes a lot of energy to drive the operation of the heat pump system, but also installs large-scale compressors and other equipment, which is inconvenient to install.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a refrigeration and cold and heat recovery integrated system and a comprehensive utilization method for refrigeration and cold and heat recovery, which can flexibly switch the operating state of the system and adapt to different cooling capacities and flow rates of cold media.

The integrated system of refrigeration and cold and heat recovery according to one aspect of the present invention includes: a cold source and a heat source; a third heat exchanger connected to the cold source; a refrigerator connected to the third heat exchanger and formed with the third heat exchanger a circuit; a first heat exchanger, connected to the cold source; a primary heat exchanger, connected to the heat source, at least one circuit is formed between the first heat exchanger and the primary heat exchanger; at least one valve is used to switch the first heat exchanger The working state between the heat exchanger and the third heat exchanger.

Further, the integrated system of refrigeration and cold and heat recovery includes a second valve and a fourth valve, the second valve is connected to the cold source and the first heat exchanger, the fourth valve is connected to the first heat exchanger and the exhaust port, and the fourth valve is connected The second valve and the fourth valve are configured so that the cold medium flows out from the cold source, flows through the third heat exchanger, and is discharged.

Further, the refrigeration and cold and heat recovery integrated system includes a first valve and a fourth valve, the first valve is connected to the cold source and the third heat exchanger, the fourth valve is connected to the first heat exchanger and the exhaust port, the first valve and the The fourth valve is configured so that the cold medium flows out from the cold source, passes through the first heat exchanger and the third heat exchanger in sequence, and then is discharged.

Further, the integrated system of refrigeration and cold and heat recovery includes a third valve, the third valve is connected to the first heat exchanger and the third heat exchanger, and the third valve is configured to make the cold medium flow out from the cold source and be divided into two parts. One way is discharged after passing through the first heat exchanger, and the other way is discharged after passing through the third heat exchanger.

Further, the first heat exchanger is connected with the first circulation pump, and the third heat exchanger is connected with the third circulation pump.

The method for comprehensive utilization of refrigeration and cold and heat recovery according to another aspect of the present invention is characterized in that it includes the following steps: switching the operating state, and controlling at least one valve, so that the cold medium flows out from the cold source and passes through the first heat exchanger and/or the second heat exchanger. Three heat exchangers; when the cold medium flows through the first heat exchanger, the cold medium and the heat medium flowing out of the heat source conduct heat exchange through the first heat exchanger and the primary heat exchanger; when the cold medium flows through the third heat exchange During the cooling process, the cold medium transfers the cooling capacity to the refrigerator through the third heat exchanger.

Further, the step of switching the operating state includes: closing the second valve and the fourth valve, so that after the cooling medium flows out from the cooling source, it flows through the second heat exchanger, and then is discharged from the exhaust port.

Further, the step of switching the operating state includes: closing the first valve and the fourth valve, so that after the cold medium flows out from the cold source, it passes through the first heat exchanger and the third heat exchanger in sequence, and then is discharged from the exhaust port.

Further, the step of switching the operating state includes: closing the third valve, so that after the cooling medium flows out from the cold source, it is divided into two paths, one path is discharged after passing through the first heat exchanger, and the other path is discharged after passing through the third heat exchanger.

Further, the comprehensive utilization method for refrigeration and cold and heat recovery further comprises the steps of: controlling the first circulating pump to adjust the flow between the first heat exchanger and the second heat exchanger; and/or controlling the third circulating pump to adjust Flow between the third heat exchanger and the refrigerator.

Applying the comprehensive system of refrigeration and cold and heat recovery of the present invention, when in use, the working state of the first heat exchanger and the third heat exchanger can be switched by adjusting the state of the valve, so that the cooling capacity of the cold source is sufficient and the cooling capacity is insufficient. Under the circumstance, the whole system can achieve a better operating state and improve the cooling utilization efficiency of the system.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of a system according to an embodiment of the present invention;

2 is a schematic diagram of a second system according to an embodiment of the present invention;

3 is a schematic diagram of a third system according to an embodiment of the present invention;

4 is a schematic diagram of a fourth system according to an embodiment of the present invention;

5 is a schematic diagram of a fifth system according to an embodiment of the present invention;

The above figures contain the following reference numbers:

label name label name 100 LPG tank 410 first valve 110 first heat exchanger 420 second valve 120 first circulating pump 430 third valve 130 second heat exchanger 440 Fourth valve 140 expander 450 Fifth valve 150 dynamo 510 Fourth heat exchanger 210 primary heat exchanger 520 Dehumidifier 211 Second circulating pump 530 Secondary heat exchanger 310 third heat exchanger 540 Regenerator 320 third circulation pump 550 Fourth circulating pump 330 Cooler

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

1 and 2, the cold and heat comprehensive utilization system of the first aspect of this embodiment includes: a heat exchanger, connected to a cold source; a heat exchanger, connected to a heat source; a cold source and a heat source; a heat exchanger and a heat exchange The heater can transfer the heat of the heat source to the cold source.

Applying the cold and heat comprehensive utilization system of this embodiment, when in use, the heat of the heat source can be transferred to the cold source through the connecting pipeline arranged between the heat exchanger and the heat exchanger, so that the heat of the heat source can be transferred to the cold source Warming up the cold source greatly reduces the energy consumption caused by setting up independent open-frame heat exchangers and heat recovery devices, and at the same time reduces the pollution caused by discharging cold and heat into the external environment.

Among them, the heat exchanger and the heat exchanger can transfer the heat of the heat source to the cold source in various ways, such as forming a loop between the heat exchanger and the heat exchanger, and transporting the heat from the heat source through the circulation of the heat transfer medium in the loop To the cold source, a one-way pipeline can also be set between the heat exchanger and the heat exchanger, the heat transfer medium is heated in the heat exchanger and then transported to the heat exchanger for cooling, and the heat is transferred to the cold source; By arranging the heat exchanger and the heat exchanger as a semiconductor heat exchanger, and electrically connecting the heat exchanger and the heat exchanger.

It should be understood that whether it is in the form of a loop or a one-way pipeline, due to the simultaneous existence of a cold source and a heat source, the loop or pipeline can operate without a circulating pump. Of course, in order to enhance the circulation effect, a circulating pump can also be set to assist The heat transfer medium flows.

As shown in Figure 1, in order to enable the heat in the heat source to be transferred to the cold source stably for a long time, the heat exchanger can be selected to form a loop to transfer heat. At this time, if the temperature difference between the cold source and the heat source exceeds If it is too large, it will cause the pressure of the heat transfer medium in the circuit to be too high, and increase the risk of tube burst; in order to reduce the pressure of the heat transfer medium in the circuit and reduce the risk of tube burst, a second heat exchanger 130 can also be installed in the system, and the second heat exchanger 130 can be installed in the system. One end of the heat exchanger 130 forms a circuit with the heat exchanger, and the other end of the second heat exchanger 130 forms a circuit with the heat exchanger; as shown in FIG. 1 , the first heat exchanger 110 and the second heat exchanger 130 form a circuit, The second heat exchanger 130 and the first-stage heat exchanger 210 form a loop, and the two loops are connected in series to transfer heat from the heat source to the cold source in turn, so as to avoid excessive pressure of the heat transfer medium when a single loop is used, resulting in tube burst.

In particular, there is only a relationship of heat exchange between the above two loops, but no relationship of mutual flow of media; similarly, there is only a relationship of heat exchange between the loop and the cold source, and between the loop and the heat source, but there is no relationship of mutual flow of media.

Further, in order to enhance the heat exchange efficiency of the circuit, the second circulation pump 211 may be connected between the second heat exchanger 130 and the heat exchanger, or the first circulation pump may be connected between the second heat exchanger 130 and the heat exchanger The pump 120 is used to promote the flow of the medium in the two circuits; specifically, as shown in FIG. 1 , a first circulating pump 120 is provided between the first heat exchanger 110 and the second heat exchanger 130, and the second heat exchanger A second circulating pump 211 is arranged between the heat exchanger 130 and the primary heat exchanger 210; the two circulating pumps can be selectively activated to enhance the heat conduction effect of the respective circuits, and further, the flow rate in the respective circuits can be limited by controlling the circulating pumps , to better match the coldness of the cold source and the heat of the heat source.

In order to further reduce the system pressure and make better use of the heat of the heat source, an expander 140 can be connected to the heat exchanger to convert the internal energy of the heat-conducting medium into kinetic energy; the expander 140 can be connected to the heat exchanger according to requirements. The exchanger is directly and indirectly connected; when the expander 140 is directly connected with the heat exchanger, the heat exchanger and the heat exchanger form a circuit, and the expander 140 is located in the circuit; when the expander 140 is indirectly connected with the heat exchanger, as shown in the figure The expander 140 shown in 1 is located in the circuit formed by the second heat exchanger 130 and the first heat exchanger 110 .

At this time, the kinetic energy can be further converted by connecting the expander 140 to a motor or a fan or the like.

Similarly, a dehumidifier 520 can also be arranged between the heat exchanger and the heat exchanger to dehumidify the air; wherein, the dehumidifier 520 can adopt various methods such as a heat exchange dehumidifier 520 or a solution dehumidifier 520 .

When the dehumidifier 520 is a solution dehumidifier 520, a regenerator 540 can be arranged between the heat exchanger and the heat exchanger, and the heat exchange medium passes through the heat exchanger, the dehumidifier 520, the heat exchanger and the regenerator 540 in sequence and returns to the The heat exchanger forms a loop; as shown in FIG. 2 , the fourth heat exchanger 510 , the secondary heat exchanger 530 , the dehumidifier 520 and the regenerator 540 form a loop.

Further, in order to efficiently absorb water vapor in the air, lithium bromide solution can be used as a heat exchange ring.

As shown in FIG. 2 , the air can be driven by a fan to pass through the dehumidifier 520 to achieve a better dehumidification effect.

As shown in FIG. 1 , the cooling source is supplied by the liquefied gas tank 100, and the heat source is supplied by the boiler; specifically, the cooling capacity is provided by the gasification of the liquefied gas discharged from the liquefied gas tank 100, and the heat is provided by the flue gas discharged from the boiler; Not only the waste heat of the boiler can be effectively recovered, but also the cooling capacity of the liquefied gas in the liquefied gas tank 100 can be fully utilized, and the pollution to the environment caused by the discharge of high-temperature flue gas and cooling capacity is reduced; further, a multi-circuit series connection method is adopted. It can effectively prevent the temperature difference between the flue gas and the liquefied gas from being too large, causing the pipe burst of the system.

As shown in FIG. 2 , the industrial dehumidification device of the second aspect of this embodiment includes: a first heat exchanger 110 connected to a cold source; a primary heat exchanger 210 connected to a heat source; an expander 140 connected to the first heat exchanger The heat exchanger 110 is connected with the primary heat exchanger 210, and the expander 140 is driven and connected to the fan; the fourth heat exchanger 510 is connected with the cold source; the secondary heat exchanger 530 is connected with the heat source; the dehumidifier 520 is connected with the first heat exchange 110 and the primary heat exchanger 210; the fan is used to drive the air to flow through the dehumidifier 520 and then be discharged into the room.

Applying the industrial dehumidification device of the present invention, when in use, the cooling capacity required for the operation of the dehumidifier 520 is supplied by the cold source and the heat source through the fourth heat exchanger 510 and the secondary heat exchanger 530, no heat pump is required, and the cooling capacity is fully utilized. At the same time, the energy used to drive the heat pump system is greatly saved, wherein the energy used to drive the fan is transferred by the cooling source and the heat source through the expander 140, which further reduces the energy consumption for driving the fan.

Among them, the energy sources of the dehumidifier 520 and the fan are both from the cold source and the heat source, which can greatly reduce the external power supply, and even do not need external power supply when the heat source is sufficient.

It should be understood that the first heat exchanger 110, the primary heat exchanger 210 and the expander 140 may be connected by a one-way pipeline, and may also form a loop to achieve long-term stable operation; similarly, the fourth heat exchanger 510 , the secondary heat exchanger 530 and the dehumidifier 520 can also be connected by a one-way pipeline or a loop.

As shown in FIG. 2 , the first heat exchanger 110, the primary heat exchanger 210 and the expander 140 constitute a first circuit, and a first circulation pump 120 is arranged in the first circuit; wherein, the circulation pump can promote better heat transfer medium The ground flows in the first loop, and the first circulating pump 120 can also be used to control the flow rate of the heat transfer medium in the first loop, so as to control the output condition of the expander 140 .

Similarly, the fourth heat exchanger 510, the secondary heat exchanger 530 and the dehumidifier 520 constitute a second circuit, a fourth circulation pump 550 is arranged in the second circuit, and the fourth circulation pump 550 drives the working medium in the second circuit flow.

Among them, in order to enable the dehumidifier 520 to continuously dehumidify the indoor air and avoid intermittent dehumidification, a regenerator 540 can also be set in the second circuit. Low, when the medium flows through the regenerator 540, the moisture in the medium is removed and the medium concentration is restored.

As shown in FIG. 2 , the second circuit is configured such that the working fluid passes through the fourth heat exchanger 510, the dehumidifier 520, the secondary heat exchanger 530 and the regenerator 540 in sequence and returns to the fourth heat exchanger 510; When passing through the dehumidifier 520, the working fluid absorbs the moisture in the air, and the solution concentration becomes lower; then the solution enters the secondary heat exchanger 530 and takes away the heat of the heat source, and then enters the regenerator 540, where the moisture in the solution is regenerated Dehumidifier 540 evaporates, the concentration of the solution increases, and then enters the fourth heat exchanger 510. After the solution is cooled, the solubility of the solute decreases, the water absorption capacity of the working fluid increases, and then the working fluid returns to the dehumidifier 520 to continue dehumidification, and the whole system circulates Operation to ensure the humidity of the indoor environment.

In order to make the working medium have better thermal conductivity and dehumidification performance, a lithium bromide solution can be selected as the working medium.

Further, in order to discharge the moisture evaporated by the regenerator 540, the air flows through the ventilation duct, flows through the regenerator 540 under the drive of the fan, and is discharged outside; as shown in FIG. The regenerator 520 is blown into the room, and the other way is discharged to the outside through the regenerator 540.

As shown in FIG. 2 , the first heat exchanger 110 and the fourth heat exchanger 510 are sequentially located downstream of the cooling source, and the primary heat exchanger 210 and the secondary heat exchanger 530 are sequentially located downstream of the heat source; After heating and cooling respectively, the fourth heat exchanger 510 and the secondary heat exchanger 530 exchange heat with the dehumidifier 520, and the temperature difference is small, which can prevent the medium temperature in the circuit where the dehumidifier 520 is located from being too low, resulting in supersaturation of the medium solution. Cause the solute to be washed out and affect the system operation.

On the other hand, in order to prevent air pollution caused by contact between the heat transfer medium and air, the dehumidifier 520 may be set as an evaporator, and dehumidification is performed by condensation and dehumidification to prevent the heat transfer medium from contacting the air.

Further, a condenser is arranged between the fourth heat exchanger 510 and the secondary heat exchanger 530, the fourth heat exchanger 510, the evaporator, the secondary heat exchanger 530 and the condenser form a circuit in turn, and the fan is used to drive The air passes through the evaporator and the condenser in turn and is discharged into the room; at this time, the heat transfer medium evaporates and absorbs heat after passing through the evaporator, so that the water vapor in the air condenses, and then the heat transfer medium is heated through the secondary heat exchanger to take away the heat in the heat source. Heat, further heat conduction medium passes through the condenser, dissipates the heat into the air to heat up the air, and then passes through the fourth heat exchanger 510, transfers the heat to the cold source, cools it and returns to the dehumidifier 520; because the fan drives the indoor air to pass through first The evaporator is cooled and dehumidified and then heated up by the condenser and then discharged into the room, which effectively reduces the temperature drop of the workshop during the dehumidification process; at the same time, the dehumidification energy consumption is reduced.

As shown in FIG. 1 , the refrigeration system of the third aspect of this embodiment includes: a cold source; a third heat exchanger 310 connected to the cold source; a refrigerator 330 connected to the third heat exchanger 310 and connected to the third heat exchanger 310 The heat exchanger 310 constitutes a circuit.

Applying the refrigeration system of this embodiment, when in use, the cooling capacity of the refrigerator 330 is continuously supplied by the cold source through the circuit formed by the third heat exchanger 310 and the refrigerator 330 , and there is no need to set up a heat pump system to provide the cooling capacity for the refrigerator 330 , which greatly reduces the energy consumption of driving the heat pump system, and uses the cold energy of the cold source in the cooling of the indoor environment, effectively reducing the environmental pollution caused by the discharge of cold energy.

Among them, the first heat exchanger 110 and the primary heat exchanger 210 of the refrigeration system, the first heat exchanger 110 is connected to the cold source, the primary heat exchanger 210 is connected to the heat source, and the first heat exchanger 110 is connected to the primary heat exchange At least one loop is formed between the boilers 210; at this time, the waste heat recovery of the refrigeration boiler can be combined to further reduce the energy consumption.

Further, in order to reduce the pipeline pressure of the circuit where the first heat exchanger 110 is located, a second heat exchanger 130 is also included. One side of the second heat exchanger 130 forms a circuit with the first heat exchanger 110. The other side of 130 forms a circuit with the primary heat exchanger 210 .

Further, an expander 140 is provided between the second heat exchanger 130 and the second heat exchanger 130 .

In order to enable the refrigeration system to achieve combined cooling and electricity supply, an expander 140 is provided between the first heat exchanger 110 and the second heat exchanger 130 .

As shown in FIG. 1 , a first circulating pump 120 is arranged between the first heat exchanger 110 and the second heat exchanger 130 , and a second circulating pump is arranged between the second heat exchanger 130 and the primary heat exchanger 210 211.

It can be understood that a circulating pump is arranged between the third heat exchanger 310 and the refrigerator 330; wherein the circulating pump can promote the circulation of the heat transfer medium in the refrigeration circuit, and can also control the refrigeration of the refrigeration circuit by controlling the working conditions of the circulating pump. working conditions, and reasonably match the cooling capacity of the cooling source and the needs of cooling users.

The refrigerator 330 may be a fan coil unit, and the indoor air is blown through the fan coil unit, so that the heat transfer medium cools the air to achieve the cooling effect.

Further, the cooling effect can be enhanced by setting a fan to drive air to blow through the fan coil, wherein the fan can be directly driven by the expander 140 or electrically driven by the generator 150 driven by the expander 140 .

In order to facilitate multiple users to use the cooling capacity of the cooling source at the same time, a plate heat exchanger can be used as the refrigerator 330, so that the cooling capacity enters the water circulation system of the central air conditioner through the plate heat exchanger and is supplied to each terminal.

The comprehensive system of refrigeration and cold and heat recovery according to the fourth aspect of the present invention is characterized in that it includes: a cold source and a heat source; a third heat exchanger 310, connected to the cold source; a refrigerator 330, connected to the third heat exchanger 310, And form a loop with the third heat exchanger 310; the first heat exchanger 110 is connected to the cold source; the primary heat exchanger 210 is connected to the heat source, and the first heat exchanger 110 and the primary heat exchanger 210 are formed At least one circuit; at least one valve for switching the working state between the first heat exchanger 110 and the third heat exchanger 310 .

Applying the integrated system of refrigeration and cold and heat recovery in this embodiment, and applying the integrated system of refrigeration and cold and heat recovery of the present invention, when in use, the first heat exchanger 110 and the third heat exchanger 310 can be switched by adjusting the state of the valve The whole system can achieve a better operating state and improve the cooling utilization efficiency of the system when the cooling capacity of the cooling source is sufficient and the cooling capacity is insufficient.

Among them, by setting the number and position of valves, the refrigeration circuit can be controlled to operate independently or in series or parallel with the recovery circuit, as follows:

As shown in FIG. 3 , the integrated system for refrigeration and cold and heat recovery includes a second valve 420 and a fourth valve 440 , the second valve 420 is connected to the cold source and the first heat exchanger 110 , and the fourth valve 440 is connected to the first heat exchanger 110 With the exhaust port, the fourth valve 440 is connected to the second valve 420 and the fourth valve 440 and is configured so that the cold medium flows out from the cold source, flows through the third heat exchanger 310 and then is discharged; when the cold source is supplied by the liquefied gas tank 100 At this time, the cold medium is liquefied gas. At this time, the second valve 420 and the fourth valve 440 are both closed. After the liquefied gas is discharged from the liquefied gas tank 100, it directly enters the third heat exchanger 310 for heat exchange, and then from the outlet Direct discharge, because the second valve 420 is closed, the liquefied gas cannot enter the first heat exchanger 110, and the closed fourth valve 440 can also prevent the liquefied gas that should be discharged to flow to the first heat exchanger 110 again, In this mode, it can ensure that the refrigeration is fully guaranteed when the cooling capacity of the liquefied gas is insufficient, which is suitable for the situation that the cooling capacity and the flow of the liquefied gas are both insufficient.

As shown in FIG. 4 , the integrated system of refrigeration and cold and heat recovery includes a first valve 410 and a fourth valve 440 , the first valve 410 is connected to the cold source and the third heat exchanger 310 , and the fourth valve 440 is connected to the first heat exchanger 110 With the exhaust port, the first valve 410 and the fourth valve 440 are configured so that the cold medium flows out from the cold source, passes through the first heat exchanger 110 and the third heat exchanger 310 in sequence, and then is discharged; at this time, the first valve 410 and the The fourth valve 440 is in the closed state. After the liquefied gas is discharged from the liquefied gas tank 100, it first enters the first heat exchanger 110 for heat exchange, then enters the third heat exchanger 310 for heat exchange, and finally is discharged from the exhaust port. It can ensure that the flow rate of the discharged liquefied gas meets the requirements, and is suitable for the situation where the flow rate of the liquefied gas is sufficient but the cooling capacity is insufficient.

As shown in FIG. 5 , the refrigeration system includes a third valve 430, which is connected to the first heat exchanger 110 and the third heat exchanger 310. The third valve 430 is configured so that the cooling medium is It is divided into two paths, one is discharged after passing through the first heat exchanger 110, and the other is discharged after passing through the third heat exchanger 310; at this time, the third valve 430 is in a closed state, and the liquefied gas is discharged from the liquefied gas tank 100 and divided into two One route passes through the first heat exchanger 110 for heat exchange and then is discharged, and the other route passes through the second heat exchanger 130 for heat exchange and then exhausts, which is suitable for the situation where the flow rate and cooling capacity of the liquefied gas are relatively sufficient.

As shown in FIG. 1 , a first valve 410 , a second valve 420 , a third valve 430 , a fourth valve 440 and a fifth valve 450 can be set in the integrated refrigeration and heat recovery system at the same time according to the positions corresponding to FIG. 1 ; When the independent mode needs to be switched, it is only necessary to close the second valve 420 and the fourth valve 440, and open other valves; Yes; when the parallel mode needs to be switched, it is only necessary to close the third valve 430 and open other valves to achieve flexible switching.

In the stand-alone mode, the third valve 430 can be closed together to prevent the reverse flow of the heat transfer medium back to the first heat exchanger 110 .

Further, the first heat exchanger 110 is connected with the first circulation pump 120, and the third heat exchanger 310 is connected with the third circulation pump 320, which can be controlled by controlling the working conditions of the first circulation pump 120 and the third circulation pump 320. Cold and heat exchange and refrigeration conditions.

The method for comprehensive utilization of refrigeration and cold and heat recovery according to the fifth aspect of the present embodiment is characterized in that it includes the following steps: switching the operating state, and controlling at least one valve, so that the cold medium flows out from the cold source and passes through the first heat exchanger 110 and/or or the third heat exchanger 310; when the cold medium flows through the first heat exchanger 110, the cold medium and the heat medium flowing out of the heat source conduct heat exchange through the first heat exchanger 110 and the primary heat exchanger 210; When passing through the third heat exchanger 310 , the cold medium transfers the cold energy to the refrigerator 330 through the third heat exchanger 310 .

Further, the step of switching the operating state includes: closing the second valve 420 and the fourth valve 440, so that the cold medium flows out from the cold source, flows through the second heat exchanger 130, and then is discharged from the exhaust port; at this time, the system is in an independent state model.

In addition, the step of switching the operating state includes: closing the first valve 410 and the fourth valve 440, so that after the cooling medium flows out from the cooling source, it passes through the first heat exchanger 110 and the third heat exchanger 310 in sequence, and then passes through the exhaust port. Drain; the system is now in series mode.

Alternatively, the step of switching the operating state includes: closing the third valve 430 , so that after the cooling medium flows out from the cold source, it is divided into two paths, one path passes through the first heat exchanger 110 and then is discharged, and the other path passes through the third heat exchanger 310 . drain; the system is now in parallel mode.

Further, the comprehensive utilization method for refrigeration and cold and heat recovery further includes the steps of: controlling the first circulation pump 120 to adjust the flow between the first heat exchanger 110 and the second heat exchanger 130; and/or, controlling the third circulation The pump 320 regulates the flow between the third heat exchanger 310 and the refrigerator 330 .

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, various changes can also be made without departing from the purpose of the present invention. .

Claims (10)

1. an integrated system of refrigeration and cold and heat recovery, is characterized in that, comprises: cold and heat sources; a third heat exchanger (310), connected to the cold source; a refrigerator (330), connected to the third heat exchanger (310), and forming a circuit with the third heat exchanger (310); a first heat exchanger (110), connected to the cold source; a primary heat exchanger (210), connected to the heat source, and at least one loop is formed between the first heat exchanger (110) and the primary heat exchanger (210); At least one valve is used to switch the working state between the first heat exchanger (110) and the third heat exchanger (310). 2. The integrated system for refrigeration and cold and heat recovery according to claim 1, characterized in that it comprises a second valve (420) and a fourth valve (440), wherein the second valve (420) is connected to the cold source and the The first heat exchanger (110), the fourth valve (440) is connected to the first heat exchanger (110) and the exhaust port, and the fourth valve (440) is connected to the second valve ( 420) and the fourth valve (440) are configured so that the cold medium flows out from the cold source, flows through the third heat exchanger (310), and is discharged. 3. The integrated system for refrigeration and cold and heat recovery according to claim 1, characterized in that it comprises a first valve (410) and a fourth valve (440), the first valve (410) connecting the cold source and the The third heat exchanger (310) and the fourth valve (440) connect the first heat exchanger (110) with the exhaust port, the first valve (410) and the fourth valve ( 440) is configured so that the cold medium flows out from the cold source, passes through the first heat exchanger (110) and the third heat exchanger (310) in sequence, and then is discharged. 4. The integrated system of refrigeration and cold and heat recovery according to claim 1, characterized in that it comprises a third valve (430), and the third valve (430) is connected to the first heat exchanger (110) and the The third heat exchanger (310), the third valve (430) is configured so that the cold medium flows out from the cold source and is divided into two paths, and one path passes through the first heat exchanger (110) and then is discharged , and the other way is discharged after passing through the third heat exchanger (310). 5. The integrated system of refrigeration and cold and heat recovery according to claim 1, wherein the first heat exchanger (110) is connected with a first circulating pump (120), and the third heat exchanger (310) ) is connected to a third circulation pump (320). 6. A method for comprehensive utilization of refrigeration and cold and heat recovery, characterized in that, comprising the steps: Switching the operating state, and controlling at least one valve, so that the cold medium flows out from the cold source and passes through the first heat exchanger (110) and/or the third heat exchanger (310); When the cold medium flows through the first heat exchanger (110), the cold medium and the heat medium flowing out of the heat source pass through the first heat exchanger (110) and the primary heat exchanger (210). heat exchange; When the cold medium flows through the third heat exchanger (310), the cold medium transfers cold energy to the refrigerator (330) through the third heat exchanger (310). 7. The comprehensive utilization method for refrigeration and cold and heat recovery according to claim 6, wherein the step of switching the operating state comprises: closing the second valve (420) and the fourth valve (440), so that the cold medium After flowing out from the cold source, it flows through the second heat exchanger (130), and then is discharged from the exhaust port. 8 . The comprehensive utilization method for refrigeration and cold and heat recovery according to claim 6 , wherein the step of switching operating states comprises: closing the first valve ( 410 ) and the fourth valve ( 440 ), so that the cold medium After flowing out from the cold source, it passes through the first heat exchanger (110) and the third heat exchanger (310) in sequence, and then is discharged from the exhaust port. 9 . The comprehensive utilization method of refrigeration and cold and heat recovery according to claim 6 , wherein the step of switching the operating state comprises: closing a third valve (430), so that after the cold medium flows out from the cold source , divided into two paths, one path is discharged after passing through the first heat exchanger (110), and the other path is discharged after passing through the third heat exchanger (310). 10. The comprehensive utilization method for refrigeration and cold and heat recovery according to claim 6, further comprising the steps of: controlling the first circulating pump (120), adjusting the first heat exchanger (110) and the second the flow between the heat exchangers (130); and/or, controlling the third circulation pump (320) to adjust the flow between the third heat exchanger (310) and the refrigerator (330).

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