Step waste heat recovery system based on heat storage device

Abstract

The utility model discloses a cascade waste heat recovery system based on heat storage devices, which comprises a high-temperature medium pipeline, a low-temperature medium pipeline and at least two stages of heat storage devices, and a high-temperature medium channel connected with the high-temperature medium pipeline and a low-temperature medium channel connected with the low-temperature medium pipeline are arranged in the heat storage devices. The high-temperature medium channels of every two adjacent heat storage devices are connected, and the low-temperature medium channels of every two adjacent heat storage devices are connected. At least two stages of heat storage devices are arranged, the high-temperature medium channels of every two adjacent heat storage devices are connected, and the low-temperature medium channels of every two adjacent heat storage devices are connected, so that media with waste heat passing through the single heat storage device can be completely exchanged, the combined heat storage device is matched with the waste heat in the actual production process, waste heat resources are effectively utilized, and the energy consumption is reduced. And waste of waste heat is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and in particular to a cascade waste heat recovery system based on a heat storage device. Background Art

[0002] Waste heat resources are ubiquitous in my country, especially in the production processes of steel, chemical, petroleum, building materials, light industry and food industries. Therefore, making full use of these waste heat resources is one of the main tasks of related enterprises to save energy. The potential for waste heat utilization is huge, and it occupies an important position in the current energy conservation. The existing recycling and utilization of waste heat resources (especially gas and liquid) can be achieved through heat storage devices or energy storage devices, such as absorbing the heat of waste heat resources through heat storage devices or energy storage devices, and then releasing the heat through heat storage devices or energy storage devices to achieve the corresponding purpose. However, when heat is utilized through heat storage devices or energy storage devices, a single heat storage device or energy storage device is generally used to achieve heat utilization. However, the heat load of a single heat storage device or energy storage device is difficult to match the waste heat generated in the actual production process, and the heat of waste heat resources cannot be effectively utilized, which easily leads to waste of waste heat. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a cascade waste heat recovery system based on a heat storage device, including a high-temperature medium pipeline, a low-temperature medium pipeline and at least two stages of heat storage devices connected together, wherein the heat storage device is provided with an independent high-temperature medium channel and a low-temperature medium channel, the high-temperature medium channels of the two adjacent stages of the heat storage devices are connected and the low-temperature medium channels are connected, and the high-temperature medium channels and the low-temperature medium channels of the first and last stages of the heat storage devices are connected to the high-temperature medium pipeline and the low-temperature medium pipeline respectively. By setting at least two stages of heat storage devices connected together, and the high-temperature medium channels of the two adjacent stages of the heat storage devices are connected and the low-temperature medium channels are connected, the medium with waste heat passing through a single heat storage device can be completely exchanged, so that the combined heat storage device matches the waste heat in the actual production process, effectively utilizes waste heat resources, and avoids waste heat waste.

[0004] In one embodiment, the medium flows in the high-temperature medium channel and the low-temperature medium channel in opposite directions.

[0005] In one embodiment, a first inlet valve and a first outlet valve are provided on the high-temperature medium pipeline, and the heat storage device is located between the first inlet valve and the first outlet valve.

[0006] In one embodiment, a first regulating bypass connected in parallel with the high temperature medium pipeline is further included, and a first flow regulating valve is arranged on the first regulating bypass. By arranging the connection of each valve body and pipeline, the medium flow in various situations can be adapted to realize various heat exchange modes.

[0007] In one embodiment, a first medium power device is also provided on the high-temperature medium pipeline.

[0008] In one embodiment, the low-temperature medium pipeline is provided with a second inlet valve and a second outlet valve, and the heat storage device is located between the second inlet valve and the second outlet valve.

[0009] In one embodiment, a second regulating bypass is further included which is connected in parallel with the cryogenic medium pipeline, and a second flow regulating valve and / or a temperature regulating valve is provided on the second regulating bypass. By setting the temperature regulating valve, the cryogenic medium can be regulated to enter the heated cryogenic medium to provide a medium resource with a constant temperature.

[0010] In one embodiment, an air steam generator is further included, the air inlet of the air steam generator is connected to the low-temperature medium pipeline after the low-temperature medium heat exchange, and the air outlet of the air steam generator is connected to the low-temperature medium pipeline before the low-temperature medium heat exchange. By setting up the air steam generator, when the low-temperature medium after heat exchange enters, it can further exchange heat to generate steam for use, and then the low-temperature medium after heat exchange re-enters the low-temperature medium inlet pipeline for recycling.

[0011] In one embodiment, the cryogenic medium pipeline is further provided with a flow meter and / or a second medium power device, the flow meter is used to monitor the flow of the cryogenic medium, and the medium power device is provided to increase the injection speed of the cryogenic medium.

[0012] In one embodiment, at least one of the at least two heat storage devices is a plurality of heat storage devices arranged in parallel. By arranging at least one or each of the heat storage devices as a plurality of heat storage devices arranged in parallel, the waste heat recovery system can realize different heat exchange forms according to actual conditions to adapt to a variety of waste heat conditions.

[0013] The cascade waste heat recovery system based on the heat storage device improves the heat storage density and the heat quality by designing a combined heat storage device. At the same time, by setting various valves and auxiliary equipment, the system operation is made more flexible; it can realize the working conditions of storage and release at the same time, pure heat storage, and pure heat release, and avoid the waste of waste heat resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following is a brief introduction to the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a structural schematic diagram of the cascade waste heat recovery system of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a single heat storage device in the cascade waste heat recovery system of the utility model;

[0017] The reference numerals in the figure are represented as follows: 1-high-temperature heat storage device; 2-low-temperature heat storage device; 3-first inlet valve; 4-first outlet valve; 5-first regulating bypass; 6-first flow regulating valve; 7-first medium power equipment; 8-second inlet valve; 9-second outlet valve; 10-second regulating bypass; 11-temperature regulating valve; 12-second flow regulating valve; 13-air steam generator; 14-third regulating inlet valve; 15-third regulating outlet valve; 16-flow meter; 17-medium power equipment; 18-temperature display alarm; 19-exhaust pipe; 20-third regulating pipeline. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the contents of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. The embodiments in the utility model and other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1

[0023] The present embodiment discloses a cascade waste heat recovery system based on a heat storage device, comprising a high-temperature medium pipeline, a low-temperature medium pipeline and at least two stages of heat storage devices connected together, the heat storage device is not specifically limited, and an existing heat storage device can be selected, preferably a phase change heat storage device; the number of stages of the heat storage device is not specifically limited, and the number of heat storage devices at each stage is not specifically limited, and can be one or more. When there are more than one, they are preferably arranged in parallel, and the heat storage device is provided with an independent high-temperature medium channel and a low-temperature medium channel. As for the arrangement of the high-temperature medium channel and the low-temperature medium channel on the heat storage device, there is no specific limitation, and they can be arranged according to the specific heat storage device, or they can be set when the heat storage device is prepared, and they can be arranged inside the heat storage device or on the surface of the heat storage device. They can be a single channel or multiple channels. In this embodiment, Figure 2As shown, the heat storage device is provided with a high temperature medium channel 102 and a low temperature medium channel 103 located between the heat storage modules 101 and between the heat storage modules 101 and the shell, and there are multiple high temperature medium channels 102 and multiple low temperature medium channels 103, respectively. The inlets and outlets of the multiple high temperature medium channels 102 are combined into one outlet and one inlet, and the inlets and outlets of the multiple low temperature medium channels 103 are combined into one outlet and one inlet, so as to facilitate the connection of adjacent heat storage devices. Of course, it can be specifically designed according to specific circumstances; the high temperature medium channels of the adjacent two levels of the heat storage devices are connected and the low temperature medium channels are connected, and the high temperature medium channels and the low temperature medium channels of the first and last heat storage devices are respectively connected to the high temperature medium pipeline and the low temperature medium pipeline. Through this connection, the form of storing and releasing at the same time, pure heat storage or pure heat release can be realized. When storing and releasing at the same time, preferably, the medium flow direction in the high temperature medium channel and the low temperature medium channel is set in countercurrent. As for the high temperature medium and the low temperature medium, they can be gas or liquid. Moreover, whether the high-temperature medium and the low-temperature medium first enter from the high-temperature heat storage device 1, or enter from the low-temperature heat storage device 2, or are discharged after heat exchange, is not specifically limited and can be specifically selected according to actual conditions. As for the high-temperature medium pipeline, it includes a high-temperature medium inlet pipeline and a high-temperature medium outlet pipeline, and as for the low-temperature medium pipeline, it includes a low-temperature medium inlet pipeline and a low-temperature medium outlet pipeline.

[0024] Specifically, Figure 1 As shown, the waste heat recovery system includes two-stage heat storage devices, and each stage has one heat storage device, specifically, one high-temperature heat storage device 1 and one low-temperature heat storage device 2, which are connected in sequence; a first inlet valve 3 is provided on the high-temperature medium inlet pipeline connected to the high-temperature medium channel of the high-temperature heat storage device 1; a first outlet valve 4 is provided on the high-temperature medium outlet pipeline connected to the high-temperature medium channel of the low-temperature heat storage device 2. By providing the first inlet valve 3 and the first outlet valve 4, the injection of the high-temperature medium and the output of the high-temperature medium after heat exchange can be conveniently adjusted.

[0025] In one embodiment, the first regulating bypass 5 connected in parallel with the high-temperature medium pipeline is further included, and a first flow regulating valve 6 is disposed on the first regulating bypass 5 .

[0026] In one embodiment, the high-temperature medium pipeline is further provided with a first medium power device 7, the location of which is not specifically limited, and is preferably provided on the high-temperature medium outlet pipeline between the first outlet valve 4 and the low-temperature heat storage device 2. The first medium power device 7 is selected according to the high-temperature medium, such as a booster fan or a liquid pump.

[0027] In one embodiment, a second inlet valve 8 is provided on the low-temperature medium inlet pipeline connected to the low-temperature medium channel of the low-temperature heat storage device 2; a second outlet valve 9 is provided on the low-temperature medium outlet pipeline connected to the low-temperature medium channel of the high-temperature heat storage device 1. The second inlet valve 8 and the second outlet valve 9 can be provided to facilitate the adjustment of the injection of the low-temperature medium and the output of the low-temperature medium after heat exchange.

[0028] In one embodiment, a second regulating bypass 10 connected in parallel with the cryogenic medium pipeline is further included, and a second flow regulating valve 12 and / or a temperature regulating valve 11 are provided on the second regulating bypass 10. The second flow regulating valve 11 can be used alone or in conjunction with the temperature regulating valve 11 for regulation, such as regulating the amount of cryogenic medium injected into the cryogenic medium after heat exchange.

[0029] In one embodiment, an air steam generator 13 is also included, the air inlet of the air steam generator 13 is connected to the low-temperature medium pipeline after the low-temperature medium heat exchange, specifically, the low-temperature medium outlet pipeline is connected through the third regulating pipeline 20, and the air outlet of the air steam generator is connected to the low-temperature medium pipeline before the low-temperature medium heat exchange, specifically, the air outlet of the air steam generator 13 is also connected to the low-temperature medium inlet pipeline through a pipeline. As for the position of the connection port of the third regulating pipeline 20, there is no specific restriction, preferably, it is set on the low-temperature medium outlet pipeline between the second regulating bypass 10 and the second outlet valve 9.

[0030] In one embodiment, a third regulating inlet valve 14 is provided on the third regulating pipeline 20 ; and a third regulating outlet valve 15 is provided on the pipeline between the air steam generator 13 and the low-temperature medium inlet pipeline.

[0031] In one embodiment, the low temperature medium inlet pipeline is further provided with a flow meter 16 and / or a second medium power device 17, preferably both are provided. The second medium power device 17 is selected according to the low temperature medium, such as a booster fan or a liquid pump.

[0032] As for the position where the low-temperature medium that has exchanged heat in the air steam generator 13 returns to the low-temperature medium inlet pipeline, there is no specific limitation, and it is preferably set between the second inlet valve 8 and the second medium power equipment 17 or the flow meter 16.

[0033] In one embodiment, the low-temperature medium outlet pipeline is further provided with a temperature display alarm 18. The setting position of the temperature display alarm 18 is not specifically limited, and is preferably located on the low-temperature medium outlet pipeline between the second regulating pipeline 10 and the connection portion between the third regulating pipeline 20 and the low-temperature medium outlet pipeline.

[0034] There is no specific limitation on the structures of the first inlet valve 3, the first outlet valve 4, the first regulating valve 6, the second inlet valve 8, the second outlet valve 9, the second regulating valve 11, the third regulating inlet valve 14 and the third regulating outlet valve 15. Existing valve bodies or devices with switching functions can be selected. In the present embodiment, the above-mentioned valves are baffle doors.

[0035] In one embodiment, the high-temperature medium after heat exchange is discharged through a high-temperature medium outlet pipeline connected to the high-temperature medium channel of the low-temperature heat storage device 2. The discharge method is not specifically limited. In this embodiment, it is discharged into the atmosphere through an exhaust pipe 19.

[0036] Example 2

[0037] This embodiment discloses a cascade waste heat recovery system based on a heat storage device, which is a variation of the embodiment 1, specifically as follows: a medium-temperature heat storage device (not shown in the figure) capable of absorbing and releasing heat is also provided between the high-temperature heat storage device 1 and the low-temperature heat storage device 2, the medium-temperature heat storage device is provided with an independent high-temperature medium channel and a low-temperature medium channel, the two ends of the high-temperature medium channel of the medium-temperature heat storage device are respectively connected to the high-temperature medium channel of the high-temperature heat storage device and the high-temperature medium channel of the low-temperature heat storage device, and the two ends of the low-temperature medium channel of the medium-temperature heat storage device are respectively connected to the low-temperature medium channel of the high-temperature heat storage device and the low-temperature medium channel of the low-temperature heat storage device. By providing a medium-temperature heat storage device, more complex waste heat conditions can be accommodated.

[0038] Example 3

[0039] This embodiment discloses a cascade waste heat recovery system based on a heat storage device, which is a variation of Embodiment 1 or Embodiment 2, specifically as follows: the number of the high-temperature heat storage device and / or the medium-temperature heat storage device and / or the low-temperature heat storage device is multiple, and they are connected according to the high-temperature medium channel and the low-temperature medium channel.

[0040] The use process of the utility model is as follows:

[0041] 1. Heat storage conditions in pure heat storage conditions and heat storage and release conditions: open the first inlet valve and the first outlet valve, close the first flow regulating valve, and the high-temperature medium will become normal temperature or low-temperature medium after heat exchange through the high-temperature heat storage device and the high-temperature medium channel of the low-temperature heat storage medium, and will be discharged into the atmosphere through the exhaust pipe, and the heat will be stored in the high-temperature heat storage device and the low-temperature heat storage device respectively.

[0042] 2. Heat release conditions in pure heat release conditions and heat storage and release conditions: open the second inlet valve and the second outlet valve, close the second flow regulating valve and the temperature regulating valve, and the low-temperature medium or the normal temperature medium is heated by the low-temperature medium channel of the low-temperature heat storage device and the high-temperature heat storage device, and becomes a medium with a certain temperature, and enters the subsequent process for use; of course, the second flow regulating valve and the temperature regulating valve can be opened to adjust the temperature of the medium after heat exchange to form a medium with a constant temperature for controlled use; of course, the second outlet valve can also be closed, and the third regulating inlet valve and the third regulating outlet valve can be opened, and the medium with a certain temperature enters the air steam generator for heat exchange to generate steam, and the steam enters the subsequent process for use. At this time, the temperature of the medium with a certain temperature decreases after heat exchange, enters the low-temperature medium inlet pipeline, and then enters the low-temperature heat storage device and the high-temperature heat storage device to form a heat supply cycle.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A cascade waste heat recovery system based on a heat storage device, characterized in that: The invention comprises a high-temperature medium pipeline, a low-temperature medium pipeline and at least two stages of heat storage devices, wherein the heat storage devices are provided with independent high-temperature medium channels and low-temperature medium channels, the high-temperature medium channels of the heat storage devices of two adjacent stages are connected and the low-temperature medium channels are connected, and the high-temperature medium channels and the low-temperature medium channels of the heat storage devices of the first and last stages are connected to the high-temperature medium pipeline and the low-temperature medium pipeline respectively.

2. The cascade waste heat recovery system according to claim 1, characterized in that: The medium in the high-temperature medium channel and the medium in the low-temperature medium channel flow in opposite directions.

3. The cascade waste heat recovery system according to claim 1, characterized in that: The high-temperature medium pipeline is provided with a first inlet valve and a first outlet valve, and the heat storage device is located between the first inlet valve and the first outlet valve.

4. The cascade waste heat recovery system according to claim 1 or 3, characterized in that: It also includes a first regulating bypass connected in parallel with the high-temperature medium pipeline, and a first flow regulating valve is arranged on the first regulating bypass.

5. The cascade waste heat recovery system according to claim 1 or 3, characterized in that: The high-temperature medium pipeline is also provided with a first medium power device.

6. The cascade waste heat recovery system according to claim 1, characterized in that: The low-temperature medium pipeline is provided with a second inlet valve and a second outlet valve, and the heat storage device is located between the second inlet valve and the second outlet valve.

7. The cascade waste heat recovery system according to claim 1 or 6, characterized in that: It also includes a second regulating bypass connected in parallel with the low-temperature medium pipeline, and a second flow regulating valve and / or temperature regulating valve is arranged on the second regulating bypass.

8. The cascade waste heat recovery system according to claim 1, characterized in that: It also includes an air steam generator, the air inlet of the air steam generator is connected to the low-temperature medium pipeline after the low-temperature medium heat exchange, and the air outlet of the air steam generator is connected to the low-temperature medium pipeline before the low-temperature medium heat exchange.

9. The cascade waste heat recovery system according to claim 1 or 6, characterized in that: The cryogenic medium pipeline is also provided with a flow meter and / or a second medium power device.

10. The cascade waste heat recovery system according to claim 1, characterized in that: At least one of the at least two stages of heat storage devices comprises a plurality of heat storage devices and is arranged in parallel.

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