Heat exchange structure for waste heat recovery

Abstract

The utility model discloses a heat exchange structure for waste heat recovery. The heat exchange structure comprises a low-temperature heat exchanger, a high-temperature heat exchanger, a secondary heat exchanger, a temperature sensing unit and a control unit, the low-temperature heat exchanger and the high-temperature heat exchanger are both connected with a waste gas conveying mechanism through a first flow guide pipeline, the secondary heat exchanger communicates with the low-temperature heat exchanger and the high-temperature heat exchanger through a second flow guide pipeline, and the low-temperature heat exchanger, the high-temperature heat exchanger and the secondary heat exchanger are each provided with a shell and a heat exchange pipe set. A first heat preservation layer, an inner container layer and a second heat preservation layer are sequentially arranged in the shell from outside to inside. The temperature sensing unit is arranged in the waste gas conveying mechanism; thus, the temperature sensing unit is used for detecting waste gas and guiding the waste gas to the corresponding heat exchanger according to the detection result, the first heat preservation layer, the inner container layer and the second heat preservation layer are matched, heat emitted out of the shell is reduced, meanwhile, the secondary heat exchanger is arranged, secondary heat exchange use of the waste gas is achieved, the heat utilization rate of the waste gas is increased, and the heat utilization rate of the waste gas is increased. The application range is wide.

Description

Technical Field

[0001] The utility model relates to the field of heat exchangers, in particular to a heat exchange structure for waste heat recovery. Background Art

[0002] At present, waste heat utilization generally refers to the recycling of waste heat generated in industrial production, converting heat energy into other energy in the industrial system, reducing energy consumption and improving energy conservation and environmental protection. As the requirements for corporate environmental protection continue to increase, waste heat utilization in industrial production is showing a growing trend; the traditional waste heat utilization system discharges the high-temperature exhaust gas generated during industrial use into a heat exchanger, uses the heat exchanger to absorb the heat from the high-temperature exhaust gas with heat, and then transports the waste heat exhaust gas after heat absorption to other devices for recycling, thereby achieving energy conservation and environmental protection.

[0003] However, the existing waste heat utilization structure is poorly designed. In some enterprises, some industrial process flows and equipment that generate waste heat have different temperatures of high-temperature exhaust gases. The temperature of the high-temperature exhaust gas may exceed one hundred degrees Celsius or be below one hundred degrees Celsius, which makes the heat exchanger poorly absorb and utilize the heat of the high-temperature exhaust gas, thereby causing a waste of heat resources. At the same time, in the process of absorbing heat from the high-temperature exhaust gas on the heat exchanger, part of the heat is easily dissipated from the shell of the heat exchanger, resulting in a waste of heat from the high-temperature exhaust gas, which is not conducive to the heat exchange efficiency in the heat exchanger, poor practicality, and a small scope of application.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0005] In view of this, the utility model aims to address the deficiencies in the prior art, and its main purpose is to provide a heat exchange structure for waste heat recovery, which utilizes a temperature sensing unit to detect the exhaust gas and directs the exhaust gas to the corresponding heat exchanger according to the detection result, and cooperates with the first insulation layer, the inner liner layer, and the second insulation layer to reduce the heat dissipated from the outer shell. At the same time, the secondary heat exchanger is set to realize the secondary heat exchange use of the exhaust gas, thereby improving the heat utilization rate of the exhaust gas and having a wide range of applications.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A heat exchange structure for waste heat recovery, comprising a low-temperature heat exchanger, a high-temperature heat exchanger, a secondary heat exchanger, a temperature sensing unit and a control unit; wherein: the low-temperature heat exchanger and the high-temperature heat exchanger are both connected to an exhaust gas conveying mechanism through a first guide pipe, the secondary heat exchanger is connected to the low-temperature heat exchanger and the high-temperature heat exchanger through a second guide pipe, the low-temperature heat exchanger, the high-temperature heat exchanger and the secondary heat exchanger all have a shell and a heat exchange tube group arranged in the shell, the low-temperature heat exchanger and the secondary heat exchanger are each provided with at least one group of heat exchange tube groups, and the high-temperature heat exchanger is provided with more than two groups of heat exchange tube groups; the inside of the shell is sequentially provided with a first insulation layer, an inner liner layer and a second insulation layer from the outside to the inside; the temperature sensing unit is arranged on the exhaust gas conveying mechanism, the first guide pipe of the low-temperature heat exchanger and the first guide pipe of the high-temperature heat exchanger are both provided with valves, and the control unit is respectively connected to the valve and the temperature sensing unit.

[0008] As a preferred solution, the first thermal insulation layer and the second thermal insulation layer are both polyurethane thermal insulation layers.

[0009] As a preferred solution, the inner wall of the shell is provided with a heat insulation layer.

[0010] As a preferred solution, the heat insulation layer is a heat insulation wool board.

[0011] As a preferred solution, a plurality of support members arranged at intervals are provided between the inner liner layer and the first thermal insulation layer and the second thermal insulation layer.

[0012] As a preferred solution, the exhaust gas conveying mechanism is connected to a dust collector for removing dust from the exhaust gas.

[0013] As a preferred solution, the number of heat exchange tube groups of the high-temperature heat exchanger is greater than the number of heat exchange tube groups of the low-temperature heat exchanger and the number of heat exchange tube groups of the secondary heat exchanger, and the number of heat exchange tube groups of the low-temperature heat exchanger is greater than or equal to the number of heat exchange tube groups of the secondary heat exchanger.

[0014] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly detects the exhaust gas by using the temperature sensing unit through the design of each component and guides the exhaust gas to the corresponding heat exchanger according to the detection result, cooperates with the first insulation layer, the inner liner layer and the second insulation layer of the shell to reduce the heat dissipated from the shell, and ensures the heat absorption of the heat exchange tube team. At the same time, the secondary heat exchanger is set to realize the secondary heat exchange of the exhaust gas, improve the heat utilization rate of the exhaust gas, and the structural design is ingenious and reasonable to realize the maximum recovery and utilization of the exhaust gas heat, thereby achieving the dual functions of energy saving and environmental protection, strong practicality and wide application range;

[0015] In addition, the setting of the heat insulation layer can achieve the effect of heat insulation, so as to ensure that the heat of the exhaust gas is not easily dissipated to the outside, thereby improving the heat utilization rate of the exhaust gas. At the same time, the setting of the dust collector can remove the dust from the exhaust gas, avoiding the accumulation of dust when the exhaust gas enters each process and affecting the normal operation of the subsequent processes, and the availability is good.

[0016] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the utility model;

[0018] Figure 2 It is a partial cross-sectional view of the housing of an embodiment of the utility model.

[0019] Description of the accompanying drawings:

[0020] 101, shell 102, heat exchange tube group

[0021] 103, first thermal insulation layer 104, liner layer

[0022] 105. Second insulation layer 11. Low temperature heat exchanger

[0023] 12. High temperature heat exchanger 13. Secondary heat exchanger

[0024] 14. Temperature sensing unit 15. Control unit

[0025] 16. First flow guide pipe 161. Valve

[0026] 17. Second flow guide pipe 18. Heat insulation layer

[0027] 19. Support member 191. Horizontal plate

[0028] 192. Connecting arm 20. Exhaust gas conveying mechanism

[0029] 21. Dust collector. DETAILED DESCRIPTION

[0030] Please refer to Figure 1 to Figure 2 As shown, it shows the specific structure of an embodiment of the utility model.

[0031] A heat exchange structure for waste heat recovery includes a low-temperature heat exchanger 11, a high-temperature heat exchanger 12, a secondary heat exchanger 13, a temperature sensing unit 14 and a control unit 15; wherein:

[0032] The low-temperature heat exchanger 11 and the high-temperature heat exchanger 12 are both connected to the exhaust gas conveying mechanism 20 through the first guide pipe 16. The secondary heat exchanger 13 is connected to the low-temperature heat exchanger 11 and the high-temperature heat exchanger 12 through the second guide pipe 17. The low-temperature heat exchanger 11, the high-temperature heat exchanger 12 and the secondary heat exchanger 13 all have a shell and a heat exchange tube group 102 arranged in the shell 101. The low-temperature heat exchanger 11 and the secondary heat exchanger 13 are each provided with at least one group of heat exchange tube groups 102, and the high-temperature heat exchanger 12 is provided with more than two groups of heat exchange tube groups 102; here, the number of heat exchange tube groups 102 of the high-temperature heat exchanger 12 is greater than the number of heat exchange tube groups 102 of the low-temperature heat exchanger 11 and the number of heat exchange tube groups 102 of the secondary heat exchanger 13, and the number of heat exchange tube groups 102 of the low-temperature heat exchanger 11 is greater than or equal to the number of heat exchange tube groups 102 of the secondary heat exchanger 13;

[0033] The interior of the shell 101 is provided with a first insulation layer 103, an inner liner layer 104, and a second insulation layer 105 in sequence from the outside to the inside; the temperature sensing unit 14 is provided on the exhaust gas conveying mechanism 20, and the first guide pipe 16 of the low-temperature heat exchanger 11 and the first guide pipe 16 of the high-temperature heat exchanger 12 are provided with valves 161, and the control unit 15 is connected to the valve 161 and the temperature sensing unit 14 respectively; preferably, the first insulation layer 103 and the second insulation layer 105 are both polyurethane insulation layers; in this way, by The design of each component uses a temperature sensing unit to detect the exhaust gas and directs the exhaust gas to the corresponding heat exchanger based on the detection results. The first insulation layer, the inner layer, and the second insulation layer of the outer shell are used to reduce the heat dissipated from the outer shell, ensuring the heat absorption of the heat exchange tube team. At the same time, the setting of the secondary heat exchanger can realize the secondary heat exchange of the exhaust gas, thereby improving the heat utilization rate of the exhaust gas. The structural design is ingenious and reasonable to realize the maximum recovery and utilization of the exhaust gas heat, thereby achieving the dual functions of energy saving and environmental protection. It is highly practical and has a wide range of applications.

[0034] In this embodiment, the inner wall of the outer shell 101 is provided with an insulation layer 18, and the first insulation layer 103 is provided on the inner side of the insulation layer 18, and the insulation layer 18 is an insulation cotton board. In this way, the insulation effect is achieved, thereby ensuring that the heat of the exhaust gas is not easily dissipated to the outside, thereby improving the heat utilization rate of the exhaust gas.

[0035] In addition, a plurality of spaced support members 19 are provided between the inner liner layer 104 and the first insulation layer 103 and the second insulation layer 105. The support member 19 is T-shaped and has a transverse plate 191 and a connecting arm 192. The transverse plate 191 is provided on the inner liner layer 104, and the connecting arm 192 is provided on the corresponding insulation layer. In this way, the support member is utilized to provide stable support for the inner liner layer and the corresponding insulation layer, thereby improving the stability between the layers and ensuring the stable use of the heat exchanger.

[0036] Furthermore, the waste gas conveying mechanism 20 is connected to a dust collector 21 for removing dust from the waste gas. Thus, the dust collector is provided to remove dust from the waste gas, thereby avoiding dust accumulation when the waste gas enters each process and affecting the normal operation of subsequent processes, and has good usability.

[0037] The design focus of the utility model is that it mainly detects the exhaust gas by using the temperature sensing unit through the design of each component and guides the exhaust gas to the corresponding heat exchanger according to the detection result, cooperates with the first insulation layer, the inner liner layer and the second insulation layer of the shell to reduce the heat dissipated from the shell, and ensures the heat absorption of the heat exchange tube team. At the same time, the secondary heat exchanger is set to realize the secondary heat exchange of the exhaust gas, improve the heat utilization rate of the exhaust gas, and the structural design is ingenious and reasonable to realize the maximum recycling of the exhaust gas heat, thereby achieving the dual functions of energy saving and environmental protection, strong practicality and wide application range;

[0038] In addition, the setting of the heat insulation layer can achieve the effect of heat insulation, so as to ensure that the heat of the exhaust gas is not easily dissipated to the outside, thereby improving the heat utilization rate of the exhaust gas. At the same time, the setting of the dust collector can remove the dust from the exhaust gas, avoiding the accumulation of dust when the exhaust gas enters each process and affecting the normal operation of the subsequent processes, and the availability is good.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heat exchange structure for waste heat recovery, characterized in that: The invention comprises a low-temperature heat exchanger, a high-temperature heat exchanger, a secondary heat exchanger, a temperature sensing unit and a control unit; wherein: the low-temperature heat exchanger and the high-temperature heat exchanger are both connected to an exhaust gas conveying mechanism through a first flow guide pipe, the secondary heat exchanger is connected to the low-temperature heat exchanger and the high-temperature heat exchanger through a second flow guide pipe, the low-temperature heat exchanger, the high-temperature heat exchanger and the secondary heat exchanger all have an outer shell and a heat exchange tube group arranged in the outer shell, the low-temperature heat exchanger and the secondary heat exchanger are each provided with at least one group of heat exchange tube groups, and the high-temperature heat exchanger is provided with more than two groups of heat exchange tube groups; the interior of the outer shell is provided with a first insulation layer, an inner liner layer and a second insulation layer in sequence from the outside to the inside; the temperature sensing unit is arranged on the exhaust gas conveying mechanism, the first flow guide pipe of the low-temperature heat exchanger and the first flow guide pipe of the high-temperature heat exchanger are both provided with valves, and the control unit is respectively connected to the valve and the temperature sensing unit.

2. A heat exchange structure for waste heat recovery according to claim 1, characterized in that: The first thermal insulation layer and the second thermal insulation layer are both polyurethane thermal insulation layers.

3. A heat exchange structure for waste heat recovery according to claim 1, characterized in that: The inner wall of the shell is provided with a heat insulation layer.

4. A heat exchange structure for waste heat recovery according to claim 3, characterized in that: The heat insulation layer is a heat insulation wool board.

5. The heat exchange structure for waste heat recovery according to claim 1, characterized in that: A plurality of support members arranged in a spacing manner are arranged between the inner liner layer and the first thermal insulation layer and the second thermal insulation layer.

6. A heat exchange structure for waste heat recovery according to claim 1, characterized in that: The exhaust gas conveying mechanism is connected to a dust collector for removing dust from the exhaust gas.

7. A heat exchange structure for waste heat recovery according to claim 1, characterized in that: The number of heat exchange tube groups of the high-temperature heat exchanger is greater than the number of heat exchange tube groups of the low-temperature heat exchanger and the number of heat exchange tube groups of the secondary heat exchanger, and the number of heat exchange tube groups of the low-temperature heat exchanger is greater than or equal to the number of heat exchange tube groups of the secondary heat exchanger.

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