A multi-stage heat recovery device

Abstract

The utility model discloses a multistage heat recovery device, including a plurality of each other adjacent interval sink and set up in each sink overflow channel and heat recovery pipeline, the sink is used for storing first liquid medium fluid, and overflow channel is provided with overflow channel between every two adjacent sink, to make the first liquid medium fluid in each sink flow gradually, heat recovery pipeline is used for conveying second liquid medium fluid, and the heat recovery pipeline in each sink is linked together, to make the first liquid medium fluid in each sink and the second liquid medium fluid in the corresponding heat recovery pipeline form gradually heat exchange, so can through multistage heat flow water formula heat recovery structure, and carry out gradually heat exchange, to guarantee that heat recovery efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery equipment technology, and in particular to a multi-stage heat recovery device. Background Technology

[0002] Currently, some high-temperature waste liquids, such as high-temperature wastewater generated by cleaning equipment, generally adopt a single-stage water storage heat recovery structure as described in utility model CN222718738U. The hot wastewater mainly flows on the upper surface and cannot fully exchange heat with the heat exchange tubes immersed in it, resulting in low heat recovery efficiency. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a multi-stage heat recovery device that utilizes a multi-stage heat flow-type heat recovery structure and performs step-by-step heat exchange to ensure high heat recovery efficiency.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model provides a multi-stage heat recovery device, including multiple adjacent water tanks, and overflow channels and heat recovery pipelines disposed in each water tank; the water tanks are used to store a first fluid, and the overflow channels allow the first fluid in each water tank to flow in stages; the heat recovery pipelines are used to transport a second fluid, and the heat recovery pipelines in each water tank are connected to each other so that the first fluid in each water tank and the second fluid in the corresponding heat recovery pipeline can form a staged heat exchange.

[0005] Furthermore, the overflow channel has an overflow outlet and an overflow inlet arranged upwards and downwards; the overflow outlet is located on the side wall or outside of the water tank so that the first fluid can flow into the adjacent lower-level water tank or flow out of the last-level water tank; the height of each overflow outlet is equal; or the height of each overflow outlet decreases step by step along the flow direction of the first fluid.

[0006] Furthermore, the overflow channel is composed of a hollow component with openings at both ends, or is composed of a baffle plate disposed in the water tank and at least one side wall of the water tank at a distance.

[0007] Furthermore, the upper edge of the baffle plate is higher than the overflow outlet of the overflow channel of the previous water tank, and the lower edge of the baffle plate is spaced apart from the bottom of the water tank to form an overflow inlet.

[0008] Furthermore, the multi-stage heat recovery device is also equipped with a first controller, a first temperature sensor in each water tank, and a short pipe connecting the two ends of each heat recovery pipeline, with a control valve installed on the short pipe; the first controller is electrically connected to each first temperature sensor and each control valve.

[0009] Furthermore, the various heat recovery pipelines are connected to form a heat recovery channel, and the outlet of the heat recovery channel is equipped with a water temperature control mechanism for adjusting the outlet water temperature.

[0010] Furthermore, the water temperature control mechanism includes a mixing valve, a second controller, and a second temperature sensor. The mixing valve has at least a first inlet, a second inlet, and a mixing outlet. The first inlet is connected to the outlet of the heat recovery channel. The second inlet is used to connect to an external water source. The second temperature sensor is installed at the mixing outlet. The second controller is electrically connected to the second temperature sensor and the mixing valve, respectively.

[0011] Furthermore, the heat recovery pipeline includes one or more heat exchange sections, which are arranged in an upward or downward spiral or an upward or downward bend, and the second fluid in the heat exchange section can flow from bottom to top.

[0012] Furthermore, the bottom of the water tank is equipped with a drainage and slag discharge device for drainage and slag discharge.

[0013] Furthermore, adjacent heat recovery pipelines are connected by pipeline connectors.

[0014] The technical solution provided by this utility model has the following beneficial effects: By setting an overflow channel between each pair of adjacent water tanks, the first fluid in each water tank flows in stages and the heat recovery pipelines in each water tank are connected, so that the first fluid in each water tank and the second fluid in the corresponding heat recovery pipeline can form a staged heat exchange. In this way, a multi-stage heat recovery structure can be formed and staged heat exchange can be carried out to ensure high heat recovery efficiency. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic of the multi-stage heat recovery device in Embodiment 1; Figure 2 The diagram shown is a schematic of the multi-stage heat recovery device in Example 2; Figure 3 The diagram shown is a schematic of the multi-stage heat recovery device in Embodiment 3. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0018] Example 1 Reference Figure 1 Embodiment 1 provides a multi-stage heat recovery device, including three adjacent water tanks, an overflow channel 7, and heat recovery pipelines within each tank. Each water tank stores hot wastewater (i.e., a first fluid) and includes a first water tank 1, a second water tank 2, and a third water tank 3 arranged side-by-side, with their ends sealed together. Each heat recovery pipeline transports tap water (i.e., a second fluid) and includes a first heat recovery pipeline 4 within the first water tank 1, a second heat recovery pipeline 5 within the second water tank 2, and a third heat recovery pipeline 6 within the third water tank 3. The inlet of the third heat recovery pipeline 6 is connected to room temperature tap water, which flows sequentially through the pipes of the third heat recovery pipeline 6, the second heat recovery pipeline 5, and the first heat recovery pipeline 4, before exiting from the hot water outlet of the first heat recovery pipeline 4. Of course, in other embodiments, the number of water tanks and corresponding heat recovery pipelines is not limited to this; there can be two or more.

[0019] Each water tank and its corresponding overflow channel 7 together form a waste liquid channel, so that the hot wastewater in each water tank can flow step by step through each overflow channel 7.

[0020] Adjacent heat recovery pipelines are connected by pipeline connectors 9, and the heat recovery pipelines in each water tank are connected to form a heat recovery channel, so that the hot wastewater in each water tank and the tap water in the corresponding heat recovery pipeline can form a step-by-step heat exchange. At this time, the outlet 15 of the heat recovery channel is the hot water outlet of the first heat recovery pipeline 4.

[0021] In this embodiment, a wastewater discharge port 8 is provided above the opening of the first water tank 1. Hot wastewater (such as water with a temperature of 55-65°C) is discharged from top to bottom into the first water tank 1 through the wastewater discharge port 8, and then flows through the second water tank 2 to the third water tank 3 in sequence.

[0022] More specifically, each overflow channel 7 has an overflow outlet 71 and an overflow inlet 72 arranged vertically. Each water tank has a baffle plate 73 that cooperates with the side wall 74 of the water tank opposite to the next water tank. The baffle plates 73 and the side wall 74 of the water tank are arranged at intervals and together form an overflow channel 7 between two adjacent water tanks. The lower edge of each baffle plate 73 is arranged at intervals with the bottom of the water tank to form an overflow inlet 72. The height of each overflow outlet 71 decreases step by step along the flow direction of the hot wastewater to ensure the natural flow of the waste liquid. Of course, in other embodiments, the overflow channel 7 can also be composed of a hollow component with openings at both ends.

[0023] The upper edge of each baffle plate 73 is higher than the overflow outlet 71 of the overflow channel 7 in the previous water tank. Due to the restriction of the overflow channel 7, the high-temperature wastewater in the upper layer of the previous water tank cannot overflow directly to the next water tank along the water surface direction. Therefore, it can be ensured that the high-temperature wastewater in the upper layer of each water tank can only flow down along the baffle plate 73 to the bottom of the water tank, which is conducive to sufficient heat exchange with their respective heat recovery pipelines.

[0024] Wastewater at the bottom of the first tank 1 overflows from bottom to top through its overflow channel 7 to the surface of the second tank 2 at the next level. Wastewater at the bottom of the second tank 2 overflows from bottom to top through its overflow channel 7 to the surface of the third tank 3 at the next level. At the same time, newly discharged hot wastewater in each tank will sink to its bottom. Therefore, the water temperature in each tank is distributed from high to low along the direction of hot wastewater flow, that is, the water temperature in the first tank 1 is the highest, the water temperature in the second tank 2 is in the middle, and the water temperature in the third tank 3 is the lowest. The water temperature in the heat recovery pipes in each tank is also distributed from low to high along the direction of tap water flow.

[0025] The temperature of the wastewater in each tank increases gradually along the direction of the hot wastewater flow, while the water temperature in the corresponding heat recovery pipes in each tank increases gradually along the direction of the tap water flow. Therefore, during operation, the hot wastewater in each tank in its vertical direction and the water in the corresponding heat recovery pipes are always at a positive temperature difference, which is conducive to heat exchange and thus improves the overall heat exchange efficiency.

[0026] By setting an overflow channel 7 between each pair of adjacent water tanks, the hot wastewater in each water tank flows in stages and the heat recovery pipelines in each water tank are connected, so that the hot wastewater in each water tank and the tap water in the corresponding heat recovery pipeline can form a staged heat exchange. In this way, a multi-stage heat recovery structure can be formed and staged heat exchange can be carried out to ensure high heat recovery efficiency.

[0027] Of course, in other embodiments, the heights of the various overflow outlets 71 may also be equal.

[0028] In a further preferred embodiment, each heat recovery pipeline includes one or more heat exchange sections, each heat exchange section is arranged in an upward or downward spiral or an upward or downward bend, the second fluid in the heat exchange section can flow from bottom to top, and the inlet and outlet of all heat recovery pipelines are close to the bottom of the water tank.

[0029] In practice, each heat recovery pipeline adopts a planar bent pipe, upper and lower spiral pipe or plate pipe, etc. After the tap water is connected, the flow direction of the tap water in each heat recovery pipeline is from top to bottom. This will effectively extend the pipeline length of the heat recovery channel, effectively increase the heat exchange area, and distribute each area of ​​each heat recovery pipeline at different water level heights in their respective water tanks, ultimately ensuring sufficient heat exchange.

[0030] In a further preferred embodiment, each water tank is equipped with a drainage and slag discharge device 14 at the bottom for drainage and slag discharge.

[0031] The water tank structure in this embodiment has a step-by-step oil separation and slag removal function. That is, light floating oil and residue will float on the upper layer of the water tank, while heavier residue will sink to the lower layer of the water tank and will not overflow directly to the next level water tank, thereby purifying the drainage of the end water tank. In this way, drainage and slag removal can be carried out when the drainage and slag removal device 14 is turned on.

[0032] Of course, in other embodiments, the water tank may contain tap water or other cold liquid that needs to be heated, and the heat recovery pipeline may be connected to hot air or hot liquid that needs to be recovered.

[0033] Example 2 like Figure 2 As shown, Embodiment 2 provides a multi-stage heat recovery device. The structure of Embodiment 2 is largely the same as that of Embodiment 1, except that the multi-stage heat recovery device is further equipped with a first controller. Each water tank (i.e., the first water tank 1, the second water tank 2, and the third water tank 3) is equipped with a first temperature sensor 11. Each heat recovery pipeline (i.e., the first heat recovery pipeline 4, the second heat recovery pipeline 5, and the third heat recovery pipeline 6) is connected to a short pipeline 16 at both ends. Each short pipeline 16 is equipped with its own independent control valve 10, and each first temperature sensor 11 controls each control valve 10 through the first controller.

[0034] When the first temperature sensor 11 detects that the water temperature in the corresponding tank is lower than the set value, it triggers the corresponding control valve 10 to open, short-circuiting the inlet and outlet of the corresponding heat recovery pipeline. This allows the tap water to bypass the tank, thus achieving heat exchange without passing through it, and flowing directly to the next tank via the short-circuit pipeline 16. Conversely, the control valve 10 closes. Alternatively, two adjacent control valves 10 can be opened simultaneously, allowing the water to bypass two adjacent third tanks 3 and second tanks 2, directly entering the first tank 1.

[0035] Of course, in other cooling embodiments, the temperature of the wastewater may need to be lower than the inlet water temperature. In this case, when the temperature of the wastewater is higher than the set value, the control valve 10 opens, and vice versa.

[0036] Example 3 like Figure 3As shown, Embodiment 3 provides a multi-stage heat recovery device. Embodiment 3 and Embodiment 1 have largely the same structure, except that the first heat recovery pipeline 4, the second heat recovery pipeline 5 and the third heat recovery pipeline 6 are connected to form a heat recovery channel. The outlet 15 of the heat recovery channel is provided with a water temperature control mechanism for adjusting its outlet water temperature. The specific water temperature control mechanism includes a mixing valve 12, a second controller and a second temperature sensor 13. The signal output terminal of the second temperature sensor 13 is connected to the signal input terminal of the second controller, and the drive output terminal of the second controller is connected to the drive input terminal of the mixing valve 12 to achieve coordinated operation.

[0037] More specifically, the mixing valve 12 has a first inlet, a second inlet and a mixing outlet. The first inlet of the mixing valve 12 is connected to the outlet of the heat recovery channel, the second inlet of the mixing valve 12 is used to connect to an external hot water source (or cold water source), and a second temperature sensor 13 is installed at the mixing outlet of the mixing valve 12.

[0038] The second controller can control the mixing valve 12 according to the preset constant temperature and the actual temperature measured by the second temperature sensor 13, so as to adjust the compensation flow of the hot water source (or cold water source), thereby controlling the outlet temperature of the mixing valve 12 and keeping it constant within a certain temperature range.

[0039] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A multi-stage heat recovery device, characterized in that: It includes multiple adjacent water tanks, and overflow channels and heat recovery pipelines in each water tank; the water tanks are used to store a first fluid, and the overflow channels allow the first fluid in each water tank to flow in stages; the heat recovery pipelines are used to transport a second fluid, and the heat recovery pipelines in each water tank are connected to each other so that the first fluid in each water tank and the second fluid in the corresponding heat recovery pipeline can form a staged heat exchange.

2. The multi-stage heat recovery device according to claim 1, characterized in that: The overflow channel has an overflow outlet and an overflow inlet arranged upwards and downwards; the overflow outlet is located on the side wall or outside of the water tank so that the first fluid can flow into the adjacent lower water tank or flow out of the last water tank; the height of each overflow outlet is equal; or the height of each overflow outlet decreases step by step along the flow direction of the first fluid.

3. The multi-stage heat recovery device according to claim 2, characterized in that: The overflow channel is formed by a hollow component with openings at both ends, or by a baffle plate installed in the water tank and at least one side wall of the water tank at a distance.

4. The multi-stage heat recovery device according to claim 3, characterized in that: The upper edge of the baffle plate is higher than the overflow outlet of the overflow channel of the previous water tank, and the lower edge of the baffle plate is spaced apart from the bottom of the water tank to form an overflow inlet.

5. The multi-stage heat recovery device according to any one of claims 1-4, characterized in that: The multi-stage heat recovery device is also equipped with a first controller, a first temperature sensor in each water tank, and a short pipe connecting the two ends of each heat recovery pipeline, with a control valve installed on the short pipe; the first controller is electrically connected to each first temperature sensor and each control valve.

6. The multi-stage heat recovery device according to any one of claims 1-4, characterized in that: Each heat recovery pipeline is connected to form a heat recovery channel, and the outlet of the heat recovery channel is equipped with a water temperature control mechanism for adjusting the outlet water temperature.

7. The multi-stage heat recovery device according to claim 6, characterized in that: The water temperature control mechanism includes a mixing valve, a second controller, and a second temperature sensor. The mixing valve has at least a first inlet, a second inlet, and a mixing outlet. The first inlet is connected to the outlet of the heat recovery channel. The second inlet is used to connect to an external water source. The second temperature sensor is installed at the mixing outlet. The second controller is electrically connected to the second temperature sensor and the mixing valve.

8. The multi-stage heat recovery device according to any one of claims 1-4, characterized in that: The heat recovery pipeline includes one or more heat exchange sections, which are arranged in an upward or downward spiral or an upward or downward bend, and the second fluid in the heat exchange section can flow from bottom to top.

9. The multi-stage heat recovery device according to any one of claims 1-4, characterized in that: The bottom of the water tank is equipped with a drainage and slag discharge device for drainage and slag discharge.

10. The multi-stage heat recovery device according to any one of claims 1-4, characterized in that: Adjacent heat recovery pipelines are connected by pipeline connectors.

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