Modular sensible heat recovery heat exchanger

Abstract

The utility model discloses a kind of sensible heat recovery heat exchange devices of modularization, belong to sensible heat recovery technical field, the sensible heat recovery heat exchange device is connected in series by multiple heat exchange units in turn;Two adjacent The heat exchange unit detachably connects, the heat exchange unit is isolated and arranged with refrigerant and heat medium, the heat medium flows along the length direction of the heat exchange unit, the refrigerant is located at the circumferential periphery of the heat medium, and the refrigerant is used to absorb and store heat from the heat medium.This device uses modular design, connected in series by multiple heat exchange units in turn, two adjacent heat exchange units are detachably connected, can be flexibly combined and adjusted according to actual needs, easy to install, disassemble and maintain, while also convenient transportation and storage.Each heat exchange unit is isolated and arranged with refrigerant and heat medium, two kinds of working medium cannot mix together, refrigerant exchanges heat with heat medium, absorbs and stores heat from heat medium, realizes the recovery of sensible heat resource.

Description

Technical Field

[0001] This utility model belongs to the field of sensible heat recovery technology and relates to a modular sensible heat recovery heat exchange device. Background Technology

[0002] In industrial production and daily life, a large amount of sensible heat resources, such as high-temperature waste gas, are widely present. If this sensible heat is not recovered and utilized, it will lead to a huge waste of energy. However, existing sensible heat recovery heat exchangers are complex in structure, inconvenient to install and maintain, and have low heat exchange efficiency, failing to meet the needs of efficient sensible heat recovery.

[0003] Therefore, there is an urgent need for a new type of sensible heat recovery heat exchanger to solve the above problems. Utility Model Content

[0004] In order to at least solve the problems of complex structure, inconvenient installation and maintenance of existing sensible heat recovery heat exchanger devices in the prior art, the present invention provides the following technical solution: a modular sensible heat recovery heat exchanger device, wherein the sensible heat recovery heat exchanger device is composed of multiple heat exchange units connected in series.

[0005] The two adjacent heat exchange units are detachably connected. A refrigerant and a heat medium are isolated inside the heat exchange unit. The heat medium flows along the length of the heat exchange unit, and the refrigerant is located around the periphery of the heat medium. The refrigerant is used to absorb and store heat from the heat medium.

[0006] Optionally, in the above-described modular sensible heat recovery heat exchanger, the refrigerant and the heat transfer medium flow in opposite directions.

[0007] Optionally, in the above-described modular sensible heat recovery heat exchange device, the heat exchange unit includes:

[0008] Inner cylinder; and

[0009] An outer cylinder is fitted onto the inner cylinder and is sealed to the inner cylinder. One end of the outer cylinder is provided with a working fluid inlet, and the other end of the outer cylinder is provided with a working fluid outlet.

[0010] The working fluid outlet is located closer to the air inlet end of the inner cylinder than the working fluid inlet.

[0011] The heat medium is located inside the inner cylinder;

[0012] The refrigerant is located between the outer cylinder and the inner cylinder.

[0013] Optionally, in the above-described modular sensible heat recovery heat exchange device, the heat exchange unit further includes: a spiral heat exchange tube;

[0014] The spiral heat exchange tube is located within the jacket and is wound around the inner cylinder. The spiral heat exchange tube is filled with the refrigerant. One end of the spiral heat exchange tube is connected to the working fluid inlet, and the other end of the spiral heat exchange tube is connected to the working fluid outlet.

[0015] Optionally, in the above-described modular sensible heat recovery heat exchange device, a thermally conductive agent is filled between the outer cylinder and the inner cylinder.

[0016] Optionally, in the above-described modular sensible heat recovery heat exchange device, the spiral heat exchange tubes in the plurality of heat exchange units are connected in series.

[0017] The working fluid inlet, located at the top, is connected to a cold source via a pipe.

[0018] Optionally, in the above-described modular sensible heat recovery heat exchanger, a working fluid pump is provided on the pipe near the working fluid inlet located at the first position.

[0019] A valve is installed at the air inlet end of the inner cylinder located at the front;

[0020] In the heat exchange unit, thermocouple temperature sensors are installed at both ends of the inner cylinder, the working fluid inlet, and the working fluid outlet to monitor the temperature changes of the target in real time.

[0021] Optionally, in the above-described modular sensible heat recovery heat exchange device, the refrigerant flows from bottom to top along the length of the heat exchange unit;

[0022] The heat transfer medium flows from top to bottom along the length of the heat exchange unit.

[0023] Optionally, in the above-described modular sensible heat recovery heat exchange device, the outer cylinders of two adjacent heat exchange units are connected by a connecting pipe.

[0024] Optionally, in the above-described modular sensible heat recovery heat exchanger, flanges are respectively provided at both ends of the inner cylinder; and

[0025] A sealing gasket is provided between the flanges of two adjacent heat exchange units.

[0026] The beneficial effects of the technical solution provided by this utility model embodiment are:

[0027] This device adopts a modular design, consisting of multiple heat exchange units connected in series. Adjacent heat exchange units can be detachably connected, allowing for flexible combination and adjustment according to actual needs. This facilitates installation, disassembly, and maintenance, as well as transportation and storage. Each heat exchange unit contains isolated refrigerant and heat transfer medium, preventing them from mixing. The refrigerant absorbs and stores heat from the heat transfer medium through heat exchange, thus achieving the recovery of sensible heat resources. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of a heat exchange unit in a modular sensible heat recovery heat exchange device provided for an embodiment of this utility model;

[0029] Figure 2 A schematic diagram of a modular sensible heat recovery heat exchange device provided for an embodiment of this utility model;

[0030] In the diagram: 1. Inner cylinder; 2. Outer cylinder; 3. Heat transfer fluid; 4. Flange; 41. Fixing bolt; 5. Working fluid inlet; 6. Working fluid outlet; 7. Spiral heat exchanger tube; 81. First heat exchange unit; 82. Second heat exchange unit; 83. Third heat exchange unit. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0032] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] Please see Figure 1-2 The present invention provides the following technical solution: a modular sensible heat recovery heat exchange device, which is composed of multiple heat exchange units connected in series.

[0034] See Figure 2As shown, two adjacent heat exchange units can be detachably connected, such as by a connector. In this embodiment, the number of heat exchange units is not limited, as long as it meets the actual needs. Each heat exchange unit is equipped with a refrigerant (i.e., a low-temperature working fluid, such as crude brine) and a heat medium (i.e., a high-temperature working fluid, also known as a sensible heat resource, such as a high-temperature sensible heat gas flow) that are isolated from each other. In this embodiment, the isolation can be simply understood as the heat exchange unit having a partition inside that prevents the refrigerant and heat medium from mixing together.

[0035] The heat transfer medium flows along the length of the heat exchange unit, while the coolant is located around the periphery of the heat transfer medium. The coolant absorbs and stores heat from the heat transfer medium through heat exchange, thus recovering sensible heat resources. This embodiment does not limit the specific flow direction of the coolant. It is worth mentioning that, through numerous field tests, it has been verified that when the flow directions of the two working fluids are opposite (referring to...),... Figure 2 As shown in the image, the refrigerant flows from bottom to top along the length of the heat exchange unit, while the heat transfer medium flows from top to bottom along the length of the heat exchange unit, resulting in optimal heat exchange performance. This device adopts a modular design, allowing for flexible combination and adjustment according to actual needs, facilitating installation, disassembly, and maintenance, as well as convenient transportation and storage.

[0036] As an embodiment of a specific structure of a heat exchange unit, this embodiment includes an inner cylinder 1 and an outer cylinder 2. The heat medium is located inside the inner cylinder 1, and the outer cylinder 2 is fitted onto the inner cylinder 1, with a sealed connection between the outer cylinder 2 and the inner cylinder 1. One end of the outer cylinder 2 is provided with a working fluid inlet 5, and the other end is provided with a working fluid outlet 6. The working fluid inlet 5 is connected to a cold source via a pipe, allowing the refrigerant to enter the outer cylinder 2 through the pipe. The refrigerant exchanges heat with the heat medium through the pipe wall of the inner cylinder 1. During the heat exchange process, a portion of the refrigerant vaporizes after absorbing heat, forming a vapor-water mixture. This vapor-water mixture flows out from the working fluid outlet 6 and enters an adjacent heat exchange unit through a pipe. It should be noted that in this embodiment, the refrigerant adopts a counter-current design. The working fluid outlet 6 is closer to the air inlet end of the inner cylinder 1 than the working fluid inlet 5. That is, the working fluid inlet 5 is closer to the air outlet end of the inner cylinder 1, and the working fluid outlet 6 is closer to the air inlet end of the inner cylinder 1. In other words, when the refrigerant enters the space between the outer cylinder 2 and the inner cylinder 1, the flow directions of the refrigerant and the heat transfer medium are opposite. Specifically, in Figure 2 In the image shown, the heat medium flows from top to bottom along the length of the inner cylinder 1, while the coolant is located between the outer cylinder 2 and the inner cylinder 1. The coolant flows from bottom to top along the length of the inner cylinder 1, exchanging heat with the heat medium through the pipe wall of the inner cylinder 1. The coolant flows in the opposite direction to the heat medium, which can improve the heat exchange effect of the two working media.

[0037] Furthermore, the inner cylinders 1 of the multiple heat exchange units are connected in sequence, so that the heat medium can flow forward (that is, from top to bottom) along the multiple heat exchange units.

[0038] As a preferred embodiment of the above embodiment, in this embodiment, the heat exchange unit further includes a spiral heat exchange tube 7. The spiral heat exchange tube 7 is located in the interlayer formed by the outer cylinder 2 and the inner cylinder 1, and the spiral heat exchange tube 7 is wound around the inner cylinder 1. The spiral heat exchange tube 7 is filled with refrigerant. Specifically, one end of the spiral heat exchange tube 7 is connected to the working fluid inlet 5, so that the refrigerant can be injected into the spiral heat exchange tube 7 through the working fluid inlet 5. During the flow of the refrigerant in the spiral heat exchange tube 7, the flow direction of the refrigerant is opposite to that of the hot fluid. For the same length, the spiral heat exchange tube 7 has a larger surface area than a straight tube. The spiral heat exchange tube 7 can increase the heat exchange area between the refrigerant and the hot fluid and prolong the residence time of the refrigerant. This allows the refrigerant and the hot fluid to fully exchange heat, thereby improving the heat exchange efficiency. The other end of the spiral heat exchange tube 7 is connected to the working fluid outlet 6. During the heat exchange process, after absorbing heat, part of the refrigerant vaporizes to form a vapor-water mixture. The vapor-water mixture flows out from the working fluid outlet 6 and enters the spiral heat exchange tube 7 in the adjacent heat exchange unit through a pipe. It can be seen that the vapor-water mixture flows from bottom to top along the length of the heat exchange unit.

[0039] Furthermore, a thermally conductive agent 33 is filled between the outer cylinder 2 and the inner cylinder 1. By filling the microscopic uneven surfaces on the outer wall of the spiral heat exchange tube 7 and the inner wall of the inner cylinder 1 with the thermally conductive agent 33, the contact thermal resistance between the heat medium and the cold medium can be reduced, thereby achieving effective heat transfer, further improving the heat exchange efficiency, and realizing the efficient recovery of sensible heat.

[0040] The first working fluid inlet 5 (referring to...) Figure 2 In the image shown, the working fluid inlet 5 on the third heat exchange unit 83 is connected to the cold source via a pipe, allowing the refrigerant to enter the spiral heat exchange tube 7 through the working fluid inlet 5. (See also...) Figure 2 As shown, the spiral heat exchange tubes 7 in multiple heat exchange units are connected in series, that is, except for the working fluid inlet 5 located at the first position (referring to...). Figure 2 In the image shown, the working fluid inlet 5 is located on the third heat exchange unit 83, and the working fluid outlet 6 is located at the end. Figure 2 In the image shown, apart from the working fluid outlet 6 on the first heat exchange unit 81, the remaining working fluid inlets 5 and outlets 6 are connected by connecting pipes. In this way, the refrigerant can flow along the multi-segment spiral heat exchange tubes 7 in the device, and the flow direction is opposite to the flow direction of the heat medium. During the heat exchange process, after the refrigerant absorbs heat, part of the vaporized water mixture also flows in the opposite direction to the flow of the heat medium. That is, the heat exchange effect is improved by the counter-flow of the refrigerant (including the water mixture) and the heat medium.

[0041] To maintain a certain mass flow ratio of refrigerant to heat transfer medium and ensure optimal heat exchange efficiency, the working fluid inlet 5 (referring to the first inlet) should be located closer to the inlet. Figure 2In the image shown, a working fluid pump (not shown) is installed on the pipe of the working fluid inlet 5 on the third heat exchange unit 83. The working fluid pump provides power to pump the refrigerant from the cold source into the spiral heat exchange tube 7. The flow rate (referring to the mass flow rate) of the refrigerant can be adjusted by the working fluid pump. The air inlet end of the inner cylinder 1 is located at the beginning (in... Figure 1 The image shown refers to the upper part of inner cylinder 1. It's worth noting that inner cylinder 1, located at the very top, refers to... Figure 2 In the diagram shown, the inner cylinder 1) of the first heat exchange unit 81 is equipped with a valve (not shown in the diagram; the valve can be a flow regulating valve). The flow rate (mass flow rate) of the heat medium can be controlled via the valve. It should be noted that mass flow rate is the mass of fluid passing through the effective cross-section of the pipe per unit time, which can be expressed as the product of volumetric flow rate (the volume of fluid passing through per unit time) and fluid density. The mass flow rate ratio of the refrigerant to the heat medium, i.e., the proportional relationship between the mass flow rates of the refrigerant and the heat medium, is specifically determined based on the temperature of the sensible gas and the heat exchange requirements.

[0042] In the heat exchange unit, thermocouple temperature sensors (not shown in the figure) are installed at both ends of the inner cylinder 1, at the working fluid inlet 5, and at the working fluid outlet 6. These thermocouple temperature sensors are used to monitor the temperature changes of the target in real time. Specifically, the thermocouple temperature sensors located at both ends of the inner cylinder 1 are used to monitor the temperature changes of the heat transfer medium in real time, while the thermocouple temperature sensors at the working fluid inlet 5 and the working fluid outlet 6 are used to monitor the temperature changes of the refrigerant in real time.

[0043] To achieve intelligent control, the heat exchange unit includes a control system. The control system (not shown in the figure) is connected to the working fluid pump, valves, and thermocouple temperature sensors. The control system controls the operation of the working fluid pump, valves, and thermocouple temperature sensors by issuing commands and acquiring their measurement data, thereby dynamically adjusting the refrigerant flow rate.

[0044] The outer cylinders 2 in two adjacent heat exchange units are connected by a connecting pipe, so that the two adjacent outer cylinders 2 can be detachably connected.

[0045] Flanges 4 are provided at both ends of the inner cylinder 1. The flanges 4 on two adjacent heat exchange units are connected together by fixing bolts 41, which facilitates the installation, disassembly and maintenance of the device. A (high temperature resistant) sealing gasket (not shown in the figure) is provided between the flanges 4 of two adjacent heat exchange units to ensure the airtightness of the device.

[0046] by Figure 2Taking the sensible heat recovery heat exchange device shown in the image as an example, this device consists of three heat exchange units, arranged from top to bottom as the first heat exchange unit 81, the second heat exchange unit 82, and the third heat exchange unit 83. It should be noted that these three heat exchange units have the same structure; the prefixes "first," "second," and "third" are simply for easy differentiation. Specifically, the outlet flange 4 of the inner cylinder 1 in the third heat exchange unit 83 is sealed to the inlet flange 4 of the inner cylinder 1 in the second heat exchange unit 82 using fixing bolts 41. Similarly, the outlet flange 4 of the inner cylinder 1 in the second heat exchange unit 82 is connected in series with the inlet flange 4 of the inner cylinder 1 in the first heat exchange unit 81 using bolts, forming a complete heat exchange device. The working principle of this device is explained below:

[0047] High-temperature sensible heat gas (e.g., raw coal gas at 800-1000℃) is introduced into the inlet of the inner cylinder 1 of the first heat exchange unit 81 at the top of the device through a pipeline. The gas flows from top to bottom through the inner cylinder 1 of the first heat exchange unit 81, the inner cylinder 1 of the second heat exchange unit 82, and the inner cylinder 1 of the third heat exchange unit 83.

[0048] Thermal conductive agent 33 is added between the outer cylinder 2 and the inner cylinder 1 in the three heat exchange units;

[0049] A low-temperature working medium (e.g., 100-150℃ crude brine) is introduced into the spiral heat exchange tube 7 from the working medium inlet 5 of the third heat exchange unit 83 using a working medium pump. The low-temperature working medium flows from bottom to top through the spiral heat exchange tube 7 of the third heat exchange unit 83, the spiral heat exchange tube 7 of the second heat exchange unit 82, and the spiral heat exchange tube 7 of the first heat exchange unit 81.

[0050] The low-temperature working fluid exchanges heat with the high-temperature airflow through the spiral heat exchange tube 7 attached to the inner cylinder 1. At the same time, the thermal resistance between the working fluid and the heat medium is reduced by the heat transfer agent 33. After absorbing heat, part of the low-temperature working fluid vaporizes to form a steam-water mixture. After leaving the third heat exchange unit 82, the steam-water mixture enters the second heat exchange unit 82 and the first heat exchange unit 81 in sequence. It further absorbs heat in the corresponding spiral heat exchange tube 7, causing the temperature of the high-temperature sensible heat airflow to gradually decrease. Finally, the steam-water mixture forms superheated steam at a certain pressure and is output from the working fluid outlet 6 on the first heat exchange unit 81. The temperature of the high-temperature sensible heat airflow drops to 150-200℃ and is discharged from the bottom outlet of the inner cylinder 1 of the third heat exchange unit 83.

[0051] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A modular sensible heat recovery heat exchanger, characterized in that, The sensible heat recovery heat exchange device is composed of multiple heat exchange units connected in series. The two adjacent heat exchange units are detachably connected. A refrigerant and a heat medium are isolated inside the heat exchange unit. The heat medium flows along the length of the heat exchange unit, and the refrigerant is located around the periphery of the heat medium. The refrigerant is used to absorb and store heat from the heat medium.

2. The modular sensible heat recovery heat exchanger according to claim 1, characterized in that, The refrigerant and the heat transfer medium flow in opposite directions.

3. The modular sensible heat recovery heat exchanger according to claim 1, characterized in that, The heat exchange unit includes: Inner cylinder; and An outer cylinder is fitted onto the inner cylinder and is sealed to the inner cylinder. One end of the outer cylinder is provided with a working fluid inlet, and the other end of the outer cylinder is provided with a working fluid outlet. The working fluid outlet is located closer to the air inlet end of the inner cylinder than the working fluid inlet. The heat medium is located inside the inner cylinder; The refrigerant is located between the outer cylinder and the inner cylinder.

4. The modular sensible heat recovery heat exchanger according to claim 3, characterized in that, The heat exchange unit further includes: a spiral heat exchange tube; The spiral heat exchange tube is located within the jacket and is wound around the inner cylinder. The spiral heat exchange tube is filled with the refrigerant. One end of the spiral heat exchange tube is connected to the working fluid inlet, and the other end of the spiral heat exchange tube is connected to the working fluid outlet.

5. The modular sensible heat recovery heat exchanger according to claim 3, characterized in that, A thermally conductive agent is filled between the outer cylinder and the inner cylinder.

6. The modular sensible heat recovery heat exchanger according to claim 4, characterized in that, The spiral heat exchange tubes in the plurality of heat exchange units are connected in series. The working fluid inlet, located at the top, is connected to a cold source via a pipe.

7. The modular sensible heat recovery heat exchanger according to claim 6, characterized in that, A working fluid pump is installed on the pipeline near the first working fluid inlet; A valve is installed at the air inlet end of the inner cylinder located at the front; In the heat exchange unit, thermocouple temperature sensors are installed at both ends of the inner cylinder, the working fluid inlet, and the working fluid outlet to monitor the temperature changes of the target in real time.

8. The modular sensible heat recovery heat exchanger according to claim 2, characterized in that, The refrigerant flows from bottom to top along the length of the heat exchange unit; The heat transfer medium flows from top to bottom along the length of the heat exchange unit.

9. The modular sensible heat recovery heat exchanger according to claim 3, characterized in that, The outer cylinders of two adjacent heat exchange units are connected by a connecting pipe.

10. The modular sensible heat recovery heat exchanger according to claim 3, characterized in that, The inner cylinder is provided with flanges at both ends; and A sealing gasket is provided between the flanges of two adjacent heat exchange units.

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