CN210154402U - Waste heat recovery device - Google Patents
Waste heat recovery device Download PDFInfo
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- CN210154402U CN210154402U CN201921079786.5U CN201921079786U CN210154402U CN 210154402 U CN210154402 U CN 210154402U CN 201921079786 U CN201921079786 U CN 201921079786U CN 210154402 U CN210154402 U CN 210154402U
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Abstract
The application provides a waste heat recovery device, and belongs to the technical field of waste heat recovery. The waste heat recovery device comprises a multistage circulating unit, a liquid storage unit and a waste heat pipeline. Each stage of the circulation unit comprises a pumping device, a heat exchange device and a heat consuming device which are constructed into a circulation loop. The reservoir unit communicates with the circulation circuit, the reservoir unit being configured to replenish the circulation circuit with liquid. A flow channel for carrying hot fluid to flow along a preset direction is formed inside the waste heat pipeline, and heat exchange devices in the multistage circulating units are sequentially connected to the waste heat pipeline at intervals along the preset direction. And the circulation loops of every two adjacent stages of circulation units are connected through a connecting pipeline, and a first flow regulating device is arranged on the connecting pipeline. The waste heat recovery device adjusts the temperature of the liquid by adjusting the flow direction of the liquid in the circulating loop, and the adjusting range is wide, so that the temperature of the liquid in the circulating loop is effectively controlled.
Description
Technical Field
The application relates to the technical field of waste heat recovery, in particular to a waste heat recovery device.
Background
In a multistage waste heat recovery device, the temperature of a heating fluid in a circulation loop is generally controlled by adjusting the flow of a hot fluid (such as flue gas) in a waste heat pipeline passing through a heat exchanger, namely, a bypass pipeline is externally connected to the waste heat pipeline, and a valve is arranged on the bypass pipeline.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a waste heat recovery device to improve the problem that it is difficult to effectively control the temperature of the heating liquid in the circulation loop in the prior art.
The embodiment of the application provides a waste heat recovery device, which comprises a multistage circulation unit, a liquid storage unit and a waste heat pipeline;
each stage of circulating unit comprises a pumping device, a heat exchange device and a heat utilization device which are constructed into a circulating loop;
the reservoir unit is in communication with the circulation loop, the reservoir unit being configured to replenish the circulation loop with liquid;
a flow channel for hot fluid to flow along a preset direction is formed inside the waste heat pipeline, and heat exchange devices in the multistage circulation units are sequentially connected to the waste heat pipeline at intervals along the preset direction;
and the circulation loops of every two adjacent stages of circulation units in the preset direction are connected through a connecting pipeline, and a first flow regulating device is arranged on the connecting pipeline.
In the technical scheme, the circulation loops of every two adjacent stages of circulation units in the preset direction are connected through the connecting pipe, and the connecting pipe is provided with the first flow regulating device. When the temperature of the liquid in the circulation loop of the previous-stage circulation unit is too high, the first flow regulating device can be regulated to enable the circulation loop of the previous-stage circulation unit to be communicated with the circulation loop of the next-stage circulation unit adjacent to the previous-stage circulation unit, so that the liquid in the circulation loop of the previous-stage circulation unit enters the circulation loop of the next-stage circulation unit to bring heat into the circulation loop of the next-stage circulation unit, and meanwhile, the liquid storage unit supplies liquid to the circulation loop of the previous-stage circulation unit to control the temperature of the liquid in the circulation loop of the previous-stage circulation unit. The waste heat recovery device adjusts the temperature of liquid by adjusting the flow direction of the liquid in the circulating loop, does not increase the resistance of hot fluid in a waste heat pipeline, and does not cause fluctuation to a waste heat pipeline system; the liquid in the circulation loop of the circulation unit has enough pressure and good fluidity under the action of the pumping device, the temperature of the liquid is adjusted by changing the flow direction of the liquid in the circulation loop, and the adjustment range is wide, so that the temperature of the liquid in the circulation loop is effectively controlled.
In addition, the waste heat recovery device of the embodiment of the application also has the following additional technical characteristics:
in some embodiments of the present application, a heat releasing pipeline is disposed on the waste heat pipeline and is communicated with the waste heat pipeline, and the heat releasing pipeline is located between a heat exchanging device in a last stage of circulating unit and a heat exchanging device of a circulating unit adjacent to the last stage of circulating unit in the preset direction;
the heat release pipeline is provided with a second flow regulating device.
In the above technical scheme, the waste heat pipeline is provided with a heat release pipeline between the heat exchange device of the last stage of circulation unit and the heat exchange device of the circulation unit adjacent to the last stage of circulation unit, and the heat release pipeline is provided with a second flow regulating device. When the temperature of the liquid in the circulation loop of the last stage of circulation unit is overhigh, the second flow regulating device on the heat releasing pipeline can be regulated, so that part of the heat-carrying fluid flowing in the waste heat pipeline is discharged to the outside from the heat releasing pipeline, and the temperature of the liquid in the circulation loop of the last stage of circulation unit is controlled.
Optionally, the circulation loop is provided with a temperature detection device configured to detect a temperature of the liquid in the circulation loop.
In the technical scheme, the circulation loop is provided with the temperature detection device, the temperature detection device can detect the temperature of the liquid in the circulation loop, and whether the first flow regulation device or the second flow regulation device needs to be regulated or not is determined according to the temperature detected by the temperature detection device.
Furthermore, a circulation loop of a circulation unit except the last stage circulation unit in the multistage circulation unit is provided with a first temperature detection device, and a circulation loop of the last stage circulation unit is provided with a second temperature detection device;
the first temperature detection device is arranged in response to the circulation loop of the previous circulation unit;
the second flow regulating device is responsive to the second temperature sensing device.
In the above technical solution, the first flow rate adjusting device connected to the connecting pipeline between the circulation loop of the previous-stage circulation unit and the circulation loop of the next-stage circulation unit in every two adjacent circulation units is responsive to the first temperature detecting device arranged in the circulation loop of the previous-stage circulation unit, and can automatically adjust the first flow rate adjusting device according to the temperature measured by the first temperature detecting device;
the second flow regulating device is responsive to the second temperature sensing device and is automatically adjustable in response to the temperature measured by the second temperature sensing device.
In some embodiments of the present application, each stage of the circulation unit further comprises a gas-liquid separation device, and the gas-liquid separation device, the pumping device, the heat exchange device and the heat utilization device are jointly constructed into a circulation loop.
In the above technical scheme, each stage of circulation unit further comprises a gas-liquid separation device which constructs a circulation loop together with the pumping device, the heat exchange device and the heat utilization device, and the gas-liquid separation device can separate gas generated by heating and evaporating liquid in the circulation loop.
Optionally, the pumping device has a first liquid inlet and a first liquid outlet, the heat exchange device has a second liquid inlet and a second liquid outlet, the heat utilization device has a third liquid inlet and a third liquid outlet, and the gas-liquid separation device has a fourth liquid inlet and a fourth liquid outlet;
the first liquid outlet is communicated with the second liquid inlet, the second liquid outlet is communicated with the third liquid inlet, the third liquid outlet is communicated with the fourth liquid inlet, and the fourth liquid outlet is communicated with the first liquid inlet.
According to the technical scheme, the pumping device, the heat exchange device, the heat utilization device and the gas-liquid separation device are sequentially connected end to form a circulation loop, liquid in the circulation loop flows through the heat exchange device after being pressurized by the pumping device, the heat in the hot fluid in the waste heat pipeline is transferred to the liquid through the heat exchange device in a heat transfer mode to heat the liquid in the circulation loop, the heated liquid flows through the heat utilization device to transfer the heat to the heat utilization device, and finally the liquid flows back to the pumping device, so that the circulating flow of the liquid in the circulation loop is realized.
Further, the gas-liquid separation device is also provided with a fifth liquid inlet, the fifth liquid inlet is communicated with the liquid storage unit, and liquid in the liquid storage unit can enter the circulation loop through the fifth liquid inlet.
In the above technical scheme, the liquid storage unit is communicated with the fifth liquid inlet of the gas-liquid separation device, and after the gas-liquid separation device separates out the gas generated by the heated evaporation of the liquid in the circulation loop, the liquid in the liquid storage unit enters the circulation loop from the fifth liquid inlet to replenish the liquid for the circulation loop.
Furthermore, each stage of circulating unit also comprises a first pipeline and a second pipeline which are used for constructing the circulating loop, the second liquid outlet is communicated with the third liquid inlet through the first pipeline, and the third liquid outlet is communicated with the fourth liquid inlet through the second pipeline;
in every two adjacent stages of circulating units in the preset direction, the first pipeline of the previous stage of circulating unit is connected with the second pipeline of the next stage of circulating unit through the connecting pipeline.
In the above technical scheme, the second liquid outlet and the third liquid outlet are communicated through the first pipeline, that is, the first pipeline is arranged between the heat exchange device and the heat consuming device. The third liquid outlet is communicated with the fourth liquid inlet through a second pipeline, namely the second pipeline is arranged between the heat utilization device and the gas-liquid separation device. The first pipeline of the previous stage circulation unit is connected with the second pipeline of the next stage circulation unit through the connecting pipeline, when the temperature of liquid in the circulation loop of the previous stage circulation unit is too high, the liquid can enter the circulation loop of the next stage circulation unit after flowing through the heat exchange device, the temperature of the liquid in the circulation loop of the previous stage circulation unit is prevented from being too high when flowing through the heat utilization device, and meanwhile, the liquid in the circulation loop of the previous stage circulation unit can quickly flow into the gas-liquid separation device for gas-liquid separation after entering the circulation loop of the next stage circulation unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic diagram of a first possible structure of a waste heat recovery device with a three-stage circulation unit provided in embodiment 1 of the present application;
fig. 2 is a schematic structural diagram of a waste heat recovery device having a secondary circulation unit according to embodiment 1 of the present application;
fig. 3 is a schematic diagram of a second possible structure of a waste heat recovery device with a three-stage circulation unit according to embodiment 1 of the present application;
fig. 4 is a schematic diagram of a third possible structure of a waste heat recovery device with a three-stage circulation unit provided in embodiment 1 of the present application.
Icon: 100-a waste heat recovery device; 10-a circulation unit; 11-a pumping device; 111-a first liquid inlet; 112-a first liquid outlet; 12-a heat exchange means; 121-a second liquid inlet; 122-a second liquid outlet; 13-using a heat device; 131-a third liquid inlet; 132-a third liquid outlet; 14-a gas-liquid separation device; 141-a fourth liquid inlet; 142-a fourth exit port; 143-fifth inlet; 15-a first conduit; 16-a second conduit; 17-a third conduit; 18-a fourth conduit; 20-a liquid storage unit; 30-a waste heat pipeline; 40-connecting a pipeline; 50-a first flow regulating device; 60-a heat release pipeline; 70-a second flow regulating device; 80-a first temperature detection device; 90-a second temperature detection device; a-a predetermined direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1, an embodiment of the present application provides a waste heat recovery device 100, which includes a multistage circulation unit 10, a liquid storage unit 20, and a waste heat pipe 30. Each stage of the circulation unit 10 includes a pumping device 11, a heat exchange device 12, and a heat consuming device 13, which are constructed as a circulation loop. The reservoir unit 20 communicates with a circulation circuit, the reservoir unit 20 being configured to replenish the circulation circuit with liquid. A flow channel for the charged hot fluid to flow along the preset direction a is formed inside the waste heat pipeline 30, and the heat exchange devices 12 in the multistage circulation unit 10 are sequentially connected to the waste heat pipeline 30 at intervals along the preset direction a. The circulation loops of each adjacent two stages of the circulation units 10 in the preset direction a are connected by a connection pipe 40, and a first flow rate adjusting device 50 is provided on the connection pipe 40.
In practical use, the liquid in the circulation loop circulates under the action of the pumping device 11, after the liquid flows through the heat exchanging device, the heat exchanging device transfers the heat of the heat-carrying fluid in the waste heat pipeline 30 to the liquid in a heat transfer mode so as to heat the liquid, and the liquid with the heat can transfer the heat to the heat using device 13 when flowing through the heat using device 13, namely, the heat of the heat-carrying fluid in the waste heat pipeline 30 is indirectly utilized by the heat using device 13. When the temperature of the liquid in the circulation loop of the previous-stage circulation unit 10 is too high, the first flow adjusting device 50 may be adjusted to communicate the circulation loop of the previous-stage circulation unit 10 with the circulation loop of the next-stage circulation unit 10 adjacent to the previous-stage circulation unit 10, so that the liquid in the circulation loop of the previous-stage circulation unit 10 enters the circulation loop of the next-stage circulation unit 10 to bring heat into the circulation loop of the next-stage circulation unit 10, and the liquid storage unit 20 supplements the circulation loop of the previous-stage circulation unit 10 with liquid to control the temperature of the liquid in the circulation loop of the previous-stage circulation unit 10, so as to meet the heat load requirement of the heat utilization device 13. The waste heat recovery device 100 adjusts the temperature of the liquid by adjusting the flow direction of the liquid in the circulation loop, so that the resistance of the hot fluid in the waste heat pipeline 30 is not increased, and the fluctuation of a waste heat pipeline 30 system is not caused; the liquid in the circulation loop of the circulation unit 10 has sufficient pressure and good fluidity under the action of the pumping device 11, the temperature of the liquid is adjusted by changing the flow direction and the flow rate of the liquid in the circulation loop, and the adjustment range is wide, so that the temperature of the liquid in the circulation loop is effectively controlled. In addition, the waste heat recovery device 100 does not need to be provided with a bypass on the waste heat pipeline 30, and the production cost is effectively reduced.
The waste heat recovery device 100 may include a two-stage circulation unit 10, a three-stage circulation unit 10, a four-stage circulation unit 10, and the like. As shown in fig. 2, if the waste heat recovery apparatus 100 includes two stages of circulation units 10, there are two circulation units 10 in the waste heat recovery apparatus 100; as shown in fig. 1, if the waste heat recovery device 100 includes three circulation units 10, the number of the circulation units 10 in the waste heat recovery device 100 is three; if the waste heat recovery device 100 includes four stages of circulation units 10, the number of circulation units 10 in the waste heat recovery device 100 is four.
The liquid in the circulation loop mainly plays a role in transferring heat, and the liquid in the circulation loop can be various, such as water, oil and the like. The liquid in the circulation loop can be selected according to specific requirements, and if the heat quantity to be transferred is large, oil liquid with a high boiling point can be selected; if less heat needs to be transferred, water with a lower boiling point may be used.
The function of the pumping means 11 in the circulation unit 10 is to bring the liquid in the circulation circuit to a flow with a certain pressure. Optionally, the pumping device 11 is a hydraulic pump.
The heat exchange device 12 in the circulation unit 10 functions to realize heat exchange between the waste heat pipe 30 and the liquid in the circulation loop. Optionally, the heat exchange device 12 is a heat exchanger, and the specific structure of the heat exchanger can be referred to in the related art, which is not described herein again.
The heat consuming device 13 in the circulation unit 10 serves to utilize the heat in the liquid in the circulation circuit. The heat consuming device 13 may be a variety of heat consuming systems, such as a heating system, and the like. The heat utilization system comprises a heat exchanger connected with the circulation loop.
The liquid storage unit 20 may have various structures as long as it can replenish liquid for the circulation loop. As an example, the liquid storage unit 20 is a high-level liquid storage tank, and the high-level oil tank is communicated with the circulation loop of each circulation unit 10 through a pipeline. In practical use, the high-level liquid storage tank is arranged at a higher position, and the liquid is supplemented to the circulating loop by utilizing the gravitational potential energy of the liquid in the high-level liquid storage tank. For example, when the liquid in the circulation loop of the previous circulation unit 10 enters the circulation loop of the next circulation unit 10 through the connection pipe 40, the liquid in the circulation loop of the previous circulation unit 10 is insufficient, and at this time, the liquid in the high-level oil groove enters the circulation loop of the previous circulation unit 10 under the action of its own weight. Of course, when the liquid in the circulation loop of the previous stage circulation unit 10 enters the circulation loop of the next stage circulation unit 10 through the connection pipe 40, the excess liquid in the circulation loop of the next stage may flow back to the high-level reservoir.
The waste heat pipeline 30 may be a pipeline for transporting industrial exhaust gas or flue gas with heat. The flowing direction of the hot fluid in the waste heat pipeline 30 is the preset direction a, and it can be understood that the temperature of the hot fluid in the waste heat pipeline 30 is gradually reduced in the preset direction a.
The first flow rate adjusting device 50 on the connecting pipe 40 functions to adjust the flow rate of the liquid in the circulation circuit of the previous circulation unit 10 in the adjacent two-stage circulation unit 10 into the circulation circuit of the next circulation unit 10. Of course, if the flow rate of the liquid in the connecting pipe 40 is zero, the circulation circuits of the adjacent two-stage circulation units 10 are disconnected from each other. Optionally, the first flow regulating device 50 is a flow regulating valve.
In each circulation unit 10 of the waste heat recovery apparatus 100 having the above-described configuration, the liquid in the circulation circuit of the last circulation unit 10 cannot enter the circulation circuits of the other circulation units 10, and the temperature of the liquid in the circulation circuit of the last circulation unit 10 cannot be controlled well.
Therefore, in some embodiments of the present application, the waste heat pipe 30 is provided with a heat releasing pipe 60 communicated therewith, the heat releasing pipe 60 is located between the heat exchanging device 12 in the last stage circulation unit 10 and the heat exchanging device 12 of the stage circulation unit 10 adjacent to the last stage circulation unit 10 in the preset direction a, and the heat releasing pipe 60 is provided with the second flow rate adjusting device 70.
The second flow rate adjusting device 70 is used for adjusting the flow rate of the hot-carrying fluid in the waste heat pipeline 30 flowing to the outside through the heat releasing pipeline 60. Of course, if the flow rate of the hot fluid in the heat releasing pipe 60 is zero, the flow path inside the waste heat pipe 30 is disconnected from the outside. Optionally, the second flow regulating device 70 is a flow regulating valve.
When the temperature of the liquid in the circulation loop of the last stage circulation unit 10 is too high, the second flow rate adjusting device 70 on the heat releasing pipe 60 may be adjusted to discharge part of the heat-carrying fluid flowing in the waste heat pipe 30 from the heat releasing pipe 60 to the outside, so as to control the temperature of the liquid in the circulation loop of the last stage circulation unit 10.
Optionally, each circulation loop is provided with a temperature detection device configured to detect the temperature of the liquid in the circulation loop. That is, the temperature detecting means can detect the temperature of the liquid in the circulation circuit, and it is possible to determine whether the first flow rate adjusting means 50 or the second flow rate adjusting means 70 needs to be adjusted based on the temperature detected by the temperature detecting means. Of course, the first flow rate adjusting device 50 or the second flow rate adjusting device 70 may be adjusted by a manual control method according to the temperature detected by the temperature detecting device, or the first flow rate adjusting device 50 or the second flow rate adjusting device 70 may be adjusted by an automatic control method.
Further, in some embodiments of the present application, the circulation loops of the circulation units 10 other than the last-stage circulation unit 10 among all the circulation units 10 are provided with the first temperature detection device 80, and the circulation loop of the last-stage circulation unit 10 is provided with the second temperature detection device 90. The first flow rate adjusting means 50 connected to the connection pipe 40 between the circulation loop of the previous-stage circulation unit 10 and the circulation loop of the next-stage circulation unit 10 in each adjacent two circulation units 10 is responsive to the first temperature detecting means 80 provided to the circulation loop of the previous-stage circulation unit 10, i.e., automatically adjusts the first temperature detecting means 80 connected to the connection pipe 40 between the circulation loop of the previous-stage circulation unit 10 and the circulation loop of the next-stage circulation unit 10 in accordance with the temperature detected by the first temperature detecting means 80 provided to the circulation loop of the previous-stage circulation unit 10. The second flow regulating device 70 automatically regulates the second flow regulating device 70 in response to the second temperature detecting device 90, i.e., in accordance with the temperature measured by the second temperature detecting device 90.
The response relationship between the first flow regulating device 50 and the first temperature detecting device 80 can be realized by a controller, that is, the first flow regulating device 50 and the first temperature detecting device 80 are both electrically connected to the controller. When the first temperature detecting device 80 detects that the temperature of the liquid in the circulation loop of the circulation unit 10 reaches the preset value, the controller automatically controls the first flow regulating device 50 to act, so that the liquid in the circulation loop of the previous circulation unit 10 is guided into the circulation loop of the next circulation unit 10, and the heat of the liquid in the circulation loop of the previous circulation unit 10 is prevented from being excessive. In the present embodiment, the first flow regulating device 50 is an electromagnetic flow regulating valve, and the first temperature detecting device 80 is a temperature sensor.
Of course, the response relationship between the second flow regulating device 70 and the second temperature detecting device 90 can also be realized by the controller, i.e. both the second flow regulating device 70 and the second temperature detecting device 90 are electrically connected with the controller. When the second temperature detecting device 90 detects that the temperature of the liquid in the circulation loop of the last stage circulation unit 10 reaches a preset value, the controller automatically controls the second flow regulating device 70 to act, so that part of the heat-carrying fluid in the waste heat pipeline 30 is discharged from the heat releasing pipeline 60 to the outside, and the heat surplus of the liquid in the circulation loop of the last stage circulation unit 10 is avoided. In the present embodiment, the second flow regulating device 70 is an electromagnetic flow regulating valve, and the second temperature detecting device is a temperature sensor.
The liquid in the circulation loop of each circulation unit 10 absorbs the heat transferred by the heat exchange device 12 during the circulation flow, and the gas generated by the evaporation of the liquid may affect the heat transfer efficiency of the liquid in the circulation loop.
Therefore, as shown in fig. 3, in some embodiments of the present application, each stage of the circulation unit 10 further includes a gas-liquid separation device 14, and the gas-liquid separation device 14, the pumping device 11, the heat exchange device 12, and the heat utilization device 13 are collectively configured as a circulation loop.
The gas-liquid separation device 14 can separate the gas generated by the evaporation of the liquid in the circulation loop, thereby avoiding the influence on the heat transfer efficiency of the liquid in the circulation loop. In the present embodiment, the gas-liquid separator 14 is a gas-liquid separator.
In the circulation unit 10, the arrangement of the four of the gas-liquid separation device 14, the pumping device 11, the heat exchange device 12, and the heat utilization device 13 may be various as long as the four are connected together to form a circulation circuit.
Alternatively, the pumping device 11 has a first liquid inlet 111 and a first liquid outlet 112, the heat exchange device 12 has a second liquid inlet 121 and a second liquid outlet 122, the heat using device 13 has a third liquid inlet 131 and a third liquid outlet 132, and the gas-liquid separating device 14 has a fourth liquid inlet 141 and a fourth liquid outlet 142. The first liquid outlet 112 is communicated with the second liquid inlet 121, the second liquid outlet 122 is communicated with the third liquid inlet 131, the third liquid outlet 132 is communicated with the fourth liquid inlet 141, and the fourth liquid outlet 142 is communicated with the first liquid inlet 111. The pumping device 11, the heat exchange device 12, the heat utilization device 13 and the gas-liquid separation device 14 are sequentially connected end to form a circulation loop, liquid in the circulation loop flows through the heat exchange device 12 after being pressurized by the pumping device 11, the heat exchange device 12 transfers heat in hot fluid in the waste heat pipeline 30 to the liquid in a heat transfer mode to heat the liquid in the circulation loop, the heated liquid flows through the heat utilization device 13 to transfer the heat to the heat utilization device 13, and finally the liquid flows back to the pumping device 11 again to realize the circulation flow of the liquid in the circulation loop.
Further, each stage of the circulation unit 10 further includes a first pipe 15, a second pipe 16, a third pipe 17, and a fourth pipe 18 for constructing a circulation loop. The second liquid outlet 122 of the heat exchange device 12 is communicated with the third liquid inlet 131 of the heat utilization device 13 through a first pipeline 15; the third liquid outlet 132 of the heat-using device 13 is communicated with the fourth liquid inlet 141 of the gas-liquid separating device 14 through a second pipeline 16; the fourth liquid outlet 142 of the gas-liquid separation device 14 is communicated with the first liquid inlet 111 of the pumping device 11 through the third pipeline 17, and the first liquid outlet 112 of the pumping device 11 is communicated with the second liquid inlet 121 of the heat exchange device 12 through the fourth pipeline 18.
In the present embodiment, in each adjacent two-stage circulation unit 10 in the preset direction a, the first pipe 15 of the previous-stage circulation unit 10 and the second pipe 16 of the next-stage circulation unit 10 are connected by the connection pipe 40. When the temperature of the liquid in the circulation loop of the previous-stage circulation unit 10 is too high, the liquid can enter the circulation loop of the next-stage circulation unit 10 after flowing through the heat exchange device 12 by adjusting the first flow rate adjusting device 50 on the connecting pipeline 40, so that the temperature of the liquid in the circulation loop of the previous-stage circulation unit 10 is prevented from being too high when flowing through the heat using device 13, and meanwhile, the liquid in the circulation loop of the previous-stage circulation unit 10 can quickly flow into the gas-liquid separation device 14 for gas-liquid separation after entering the circulation loop of the next-stage circulation unit 10.
It is understood that the position of the connection pipe 40 is not limited to the above-mentioned position, and in other embodiments, the connection pipe 40 may be connected to other positions as long as the first flow rate adjusting device 50 is adjusted to communicate the circulation circuit of the previous stage circulation unit 10 with the circulation circuit of the next stage circulation unit 10. For example, as shown in fig. 4, the connection pipe 40 is connected between the first pipe 15 of the previous stage circulation unit 10 and the first pipe 15 of the next stage circulation unit 10.
In the case where the temperature detection means is provided in the circulation circuit, the temperature detection means may be provided on the first pipe 15, the second pipe 16, the third pipe 17, or the fourth pipe 18. In the present embodiment, the first temperature detection device 80 in the circulation loops of the other circulation units 10 except the last stage circulation unit 10 is provided on the first piping 15; the second temperature detection device 90 in the circulation circuit of the last stage circulation unit 10 is provided on the second pipe 16.
Further, the gas-liquid separation device 14 further has a fifth liquid inlet 143, the fifth liquid inlet 143 is communicated with the liquid storage unit 20, and the liquid in the liquid storage unit 20 can enter the circulation loop through the fifth liquid inlet 143.
Wherein, the fifth liquid inlet 143 of the gas-liquid separation device 14 is communicated with the liquid storage unit 20 through a pipeline.
After the gas-liquid separation device 14 separates the gas generated by the evaporation of the heated liquid in the circulation loop, the liquid in the liquid storage unit 20 enters the circulation loop from the fifth liquid inlet 143 to replenish the circulation loop. In addition, when the liquid in the circulation loop of the previous stage circulation unit 10 enters the circulation loop of the next stage circulation unit 10, the liquid in the liquid storage unit 20 enters the circulation loop of the previous stage circulation unit 10 from the fifth liquid inlet 143 to replenish the circulation loop; meanwhile, the liquid in the next-stage circulation unit 10 flows through the fourth liquid inlet 141 and the fifth liquid inlet 143 of the gas-liquid separation device 14 in sequence and then flows back to the liquid storage unit 20.
In the actual operation process, a pressure detection device (such as a pressure gauge) can be arranged in each circulation loop to monitor the pressure of the liquid in the circulation loop in real time.
It should be noted that, in any of the above embodiments, the previous-stage circulation unit 10 and the next-stage circulation unit 10 are two adjacent circulation units 10 in the preset direction a, and when the hot-carrying fluid flows in the waste heat pipeline 30 along the preset direction a, the hot-carrying fluid will first pass through the heat exchange device 12 in the previous-stage circulation unit 10 and then pass through the heat exchange device 12 in the next-stage circulation unit 10.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A waste heat recovery device, comprising:
a plurality of stages of circulation units, each stage of circulation unit comprising a pumping device, a heat exchange device and a heat consuming device which are constructed into a circulation loop;
a reservoir unit in communication with the circulation circuit, the reservoir unit configured to replenish the circulation circuit with liquid; and
the waste heat pipeline is internally provided with a flow channel for hot fluid to flow along a preset direction, and the heat exchange devices in the multistage circulation units are sequentially connected to the waste heat pipeline at intervals along the preset direction;
and the circulation loops of every two adjacent stages of circulation units in the preset direction are connected through a connecting pipeline, and a first flow regulating device is arranged on the connecting pipeline.
2. The waste heat recovery device according to claim 1, wherein a heat releasing pipeline is arranged on the waste heat pipeline and communicated with the waste heat pipeline, and the heat releasing pipeline is located between the heat exchanging device in the last stage circulating unit and the heat exchanging device of the stage circulating unit adjacent to the last stage circulating unit in the preset direction;
the heat release pipeline is provided with a second flow regulating device.
3. The waste heat recovery device according to claim 2, wherein the circulation circuit is provided with a temperature detection device configured to detect a temperature of the liquid in the circulation circuit.
4. The waste heat recovery device according to claim 3, wherein a circulation loop of a circulation unit other than the last circulation unit in the multistage circulation unit is provided with a first temperature detection device, and a circulation loop of the last circulation unit is provided with a second temperature detection device;
the first temperature detection device is arranged in response to the circulation loop of the previous circulation unit;
the second flow regulating device is responsive to the second temperature sensing device.
5. The waste heat recovery device of claim 1, wherein each stage of the circulation unit further comprises a gas-liquid separation device, and the gas-liquid separation device, the pumping device, the heat exchange device and the heat utilization device are jointly constructed into the circulation loop.
6. The waste heat recovery device of claim 5, wherein the pumping device has a first liquid inlet and a first liquid outlet, the heat exchanging device has a second liquid inlet and a second liquid outlet, the heat using device has a third liquid inlet and a third liquid outlet, and the gas-liquid separating device has a fourth liquid inlet and a fourth liquid outlet;
the first liquid outlet is communicated with the second liquid inlet, the second liquid outlet is communicated with the third liquid inlet, the third liquid outlet is communicated with the fourth liquid inlet, and the fourth liquid outlet is communicated with the first liquid inlet.
7. The waste heat recovery device according to claim 6, wherein the gas-liquid separation device further comprises a fifth liquid inlet, the fifth liquid inlet is communicated with the liquid storage unit, and the liquid in the liquid storage unit can enter the circulation loop through the fifth liquid inlet.
8. The waste heat recovery device according to claim 6 or 7, wherein each stage of circulation unit further comprises a first pipeline and a second pipeline which are used for constructing the circulation loop, the second liquid outlet is communicated with the third liquid inlet through the first pipeline, and the third liquid outlet is communicated with the fourth liquid inlet through the second pipeline;
in every two adjacent stages of circulating units in the preset direction, the first pipeline of the previous stage of circulating unit is connected with the second pipeline of the next stage of circulating unit through the connecting pipeline.
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