Recycling device for replacing hot water with waste heat of drying machine

Abstract

The utility model relates to the technical field of heat recovery devices, in particular to a drying machine waste heat replaced hot water recovery device which comprises a water storage container, a heat exchanger and a water pump, the water pump pumps water in the water storage container to enter the heat exchanger so as to achieve heat exchange with regeneration gas introduced into the heat exchanger, and the water storage container comprises two independent cavities. The chamber comprises an air inlet chamber and a water storage chamber which are isolated from each other; a preheating mechanism is arranged in the water storage chamber and comprises a heat exchange tube bundle, the air inlet side of the heat exchange tube bundle is communicated with the air inlet chamber, and the air outlet side of the heat exchange tube bundle is communicated with the external environment; the two water storage chambers are connected to the water inlet end of the water pump in parallel in a switchable mode, and the two water storage chambers are connected to the water outlet end of the heat exchanger in parallel in a switchable mode. The gas inlet end of the heat exchanger is used for introducing regenerated gas, and the two gas inlet chambers are connected to the gas outlet end of the heat exchanger in parallel in a switchable manner; the regeneration gas waste heat recycling device can recycle waste heat of regeneration gas twice.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery devices, in particular to a dryer waste heat replacement hot water recovery device. Background Art

[0002] A dryer, also known as an adsorption dryer, is primarily used to dry compressed air to produce finished gas. It essentially passes the compressed air through an adsorption tower filled with a desiccant, where the desiccant absorbs moisture from the compressed air, producing a dry finished gas. To ensure recyclable desiccant, the related art generally uses a regenerable desiccant. This desiccant can be regenerated by passing hot air through it, allowing for reusable desiccant.

[0003] In the related art, dryers are generally divided into single-tower adsorption and double-tower adsorption. Single-tower adsorption mainly uses only one adsorption tower to perform adsorption drying of compressed air. Its disadvantage is that after working for a period of time, it is necessary to stop the introduction of compressed air for adsorption and introduce hot air to regenerate the desiccant; it is equivalent to intermittent work; while the double-tower adsorption method uses two adsorption towers to perform adsorption alternately, that is, when one adsorption tower is performing adsorption work, the other adsorption tower is in a state of introducing hot air to regenerate the desiccant, and this cycle is repeated, so that the entire adsorption work and desiccant regeneration work are carried out continuously, thereby continuously performing the compressed air drying work.

[0004] Whether it is single-tower adsorption or double-tower adsorption, there is still a lot of heat (i.e. waste heat or residual heat) in the regeneration gas discharged during the desiccant regeneration process. It is wasteful to discharge this heat directly. Therefore, in related technologies, a heat exchanger is set to recover the waste heat of the regeneration gas. The waste heat is used to heat water through the heat exchanger to form hot water, thereby realizing heat recovery.

[0005] However, in actual applications, the regenerated gas still contains a lot of heat after being discharged from the heat exchanger. Especially as the water temperature increases, the heat exchange efficiency between the regenerated gas and water will also decrease, resulting in a higher temperature of the regenerated gas discharged from the heat exchanger. Direct discharge will obviously cause energy waste. Utility Model Content

[0006] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a dryer waste heat replacement hot water recovery device.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A dryer waste heat replacement hot water recovery device includes a water storage container, a heat exchanger and a water pump. The water pump draws water from the water storage container into the heat exchanger to achieve heat exchange with regenerated gas introduced into the heat exchanger. The water storage container includes two independent chambers, which include an air inlet chamber and a water storage chamber isolated from each other. A preheating mechanism is provided in the water storage chamber, and the preheating mechanism includes a heat exchange tube bundle. The air inlet side of the heat exchange tube bundle is connected to the air inlet chamber, and the air outlet side is connected to the external environment. The two water storage chambers can be switchably connected in parallel to the water inlet end of the water pump, and the two water storage chambers can be switchably connected in parallel to the water outlet end of the heat exchanger. The air inlet end of the heat exchanger is used to receive the regenerated gas, and the two air inlet chambers can be switchably connected in parallel to the air outlet end of the heat exchanger.

[0009] As an optional implementation of the present invention, the water inlet end of the water pump is connected in parallel with two water outlet branches respectively connected to the two water storage chambers, and the water outlet branches are each provided with a first valve for controlling the on / off of the water outlet branches; and / or the water outlet end of the heat exchanger is connected in parallel with two water inlet branches respectively connected to the two water storage chambers, and the water inlet branches are each provided with a second valve for controlling the on / off of the water inlet branches.

[0010] As an optional implementation of the present invention, the air outlet end of the heat exchanger is connected in parallel with two air intake branches respectively connected to the two air intake chambers, and each of the air intake branches is provided with a third valve for controlling the on / off of the air intake branch.

[0011] As an optional embodiment of the present invention, a drainage pipe for draining water from the water storage chamber is provided at the bottom of the water storage chamber, and a drainage valve is provided on the drainage pipe;

[0012] As an optional implementation of the present invention, a condensed water pipeline for discharging condensed water in the air intake chamber is provided at the bottom of the air intake chamber, and a fourth valve is provided on the condensed water pipeline.

[0013] As an optional embodiment of the present invention, the device also includes two water supply branches connected in parallel at the water outlet end of the water source, the two water supply branches are respectively connected to the two water storage chambers, and the water supply branches are each provided with a fifth valve for controlling the on and off of the water supply branches.

[0014] As an optional embodiment of the present invention, the heat exchange tube bundle includes several straight heat exchange tubes, one end of the heat exchange tube is connected to the air inlet chamber to form the air inlet side, and the other end is connected to the external environment to form the air outlet side. The air inlet side of the heat exchange tube is lower than the air outlet side.

[0015] As an optional embodiment of the present invention, the water storage container includes two tank bodies, and the top of the tank body is opened; the preheating mechanism includes an upper tube plate and a lower tube plate respectively fixed to the two ends of the heat exchange tube bundle; a step portion extending along the circumference of the tank body is provided inside the tank body, and the upper tube plate is detachably covered on the top of the tank body, and the lower tube plate abuts against the top of the step portion, so that a water storage chamber is formed inside the tank body between the upper tube plate and the lower tube plate, and the air intake chamber is formed inside the tank body below the lower tube plate.

[0016] As an optional embodiment of the present invention, a cover body is fixed to the upper part of the upper tube plate, and an air outlet chamber is formed between the upper tube plate and the cover body. The air outlet side of the heat exchange tube bundle is connected to the air outlet chamber; the air outlet chamber is connected to an air outlet pipeline, and the air outlet pipeline is provided with a sixth valve.

[0017] As an optional implementation of the present invention, a sealing ring is embedded between the step portion and the lower tube plate.

[0018] Compared with the existing technology, the advantages of adopting this solution are:

[0019] In this solution, two chambers are set up and divided into an air inlet chamber and a water storage chamber, and a heat exchange tube bundle is set in the water storage chamber. In this way, the two water storage chambers in this solution can operate alternately. That is, while the water in one water storage chamber is normally heated by heat exchange with the regeneration gas through the heat exchanger, the regeneration gas discharged through the heat exchanger will not be discharged directly to the outside, but will enter the heat exchange tube bundle in the other water storage chamber to preheat the water in the water storage chamber before being directly heated next time; this is equivalent to the water in one water storage chamber being in the normal heating stage and the water in the other water storage chamber being in the preheating stage. The heat used in the normal heating stage is provided by the regeneration gas entering the heat exchanger, and the heat in the preheating stage is provided by the regeneration gas discharged from the heat exchanger. This is equivalent to recovering the waste heat of the regeneration gas twice. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic structural diagram of a single tank body of the utility model. DETAILED DESCRIPTION

[0022] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0023] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0024] See also Figure 1 and Figure 2 As shown, this embodiment provides a dryer waste heat replacement hot water recovery device, which is mainly used to recover the waste heat or residual heat of the regeneration gas discharged from the adsorption tower.

[0025] In order to facilitate understanding, we first give a brief description of the adsorption tower, such as Figure 1 As shown, the adsorption tower is provided with a desiccant that can be regenerated when heated; during normal adsorption operation, compressed air is introduced from the bottom of the adsorption tower, and after being adsorbed and dried by the desiccant in the adsorption tower, it is discharged from the top of the adsorption tower to form finished gas; and when the desiccant in the adsorption tower needs to be regenerated, heated air, referred to as hot air, is introduced into the adsorption tower from the top of the adsorption tower. The hot air will regenerate the desiccant when passing through the desiccant, and the air generated during the regeneration process of the desiccant, namely the regenerated gas, is discharged from the bottom of the adsorption tower. Generally speaking, there is still a lot of residual heat or waste heat in the discharged regenerated gas. This device is mainly used to utilize this waste heat to heat water to form hot water to achieve heat recovery.

[0026] The device includes a water storage container, a heat exchanger 4 and a water pump 3. The water pump 3 draws water from the water storage container into the heat exchanger 4 to achieve heat exchange with the regeneration gas introduced into the heat exchanger 4.

[0027] The heat exchanger 4 can be an existing plate heat exchanger 4 or a tube heat exchanger 4, which is not specifically limited here. It generally includes a refrigerant flow channel and a heat medium flow channel. As long as the two fluids to be heat exchanged are respectively introduced into the refrigerant flow channel and the heat medium flow channel, the two fluids can achieve heat exchange in the heat exchanger 4. There are many descriptions of this type of heat exchanger 4 in the existing technology, so it will not be described in detail here. Specifically in this embodiment:

[0028] The regeneration gas is introduced into the heat medium flow channel of the heat exchanger 4, and the water to be heated is introduced into the refrigerant flow channel; one end of the heat medium flow channel is the air inlet end of the heat exchanger 4 (such as Figure 1 The other end is the outlet end of the heat exchanger 4 (as shown in b2). Figure 1 As shown in b1 in FIG), one end of the corresponding refrigerant flow channel is the water inlet end of the heat exchanger 4 (as shown in FIG. Figure 1 The other end is the water outlet of the heat exchanger 4 (as shown in a2). Figure 1After being drawn out from the adsorption tower, the regenerated gas is introduced into the heat medium flow channel from the air inlet end of the heat exchanger 4 and then drawn out from the air outlet end of the heat exchanger 4.

[0029] The water to be heated is extracted from the water storage container through the water pump 3, enters the refrigerant flow channel from the water inlet end of the heat exchanger 4, and is then discharged back to the water storage container from the water outlet end of the heat exchanger 4. This cycle is repeated, so that the regenerated gas and water can achieve heat exchange in the heat exchanger 4, so that the waste heat of the regenerated gas is used to heat the water to obtain hot water, thereby realizing heat recovery.

[0030] The water storage container includes two independent chambers, which include an air inlet chamber 12 and a water storage chamber 11 that are isolated from each other. In this embodiment, the water storage chamber 11 is located above the air inlet chamber 12.

[0031] A preheating mechanism is provided in the water storage chamber 11 , and the preheating mechanism includes a heat exchange tube bundle. The air inlet side of the heat exchange tube bundle is connected to the air inlet chamber 12 , and the air outlet side is connected to the external environment.

[0032] The two water storage chambers 11 are switchably connected in parallel to the water inlet of the water pump 3. Specifically, the water inlet of the water pump 3 is connected in parallel to two water outlet branches 5, each connected to the two water storage chambers 11. Each water outlet branch 5 is equipped with a first valve K1 that controls the on / off function of the water outlet branch 5. By controlling the opening and closing of the first valve K1, water can be pumped from the corresponding water storage chamber 11. For example, if the first valve K1 on the left is opened and the first valve K1 on the right is closed, the water pump 3 will only pump water from the left water storage chamber 11 into the heat exchanger 4 for heat exchange. Conversely, the water pump 3 will pump water from the right water storage chamber 11 into the heat exchanger 4 for heat exchange.

[0033] The two water storage chambers 11 can be switchably connected in parallel to the water outlet of the heat exchanger 4; the water outlet of the heat exchanger 4 is connected in parallel with two water inlet branches 6 respectively connected to the two water storage chambers 11, and each of the water inlet branches 6 is provided with a second valve K2 for controlling the on / off of the water inlet branch 6. By controlling the on / off of the two second valves K2, the water after heat exchange in the heat exchanger 4 can be returned to the predetermined water storage chamber 11. For example, by opening the second valve K2 on the left and closing the second valve K2 on the right, the water output from the water outlet of the heat exchanger 4 will only flow back into the water storage chamber 11 on the left, and vice versa, it will flow back into the water storage chamber 11 on the right.

[0034] The air inlet end of the heat exchanger 4 is used to receive the regenerated gas, and the two air inlet chambers 12 can be switchably connected in parallel to the air outlet end of the heat exchanger 4. Specifically: the air outlet end of the heat exchanger 4 is connected in parallel with two air inlet branches 7 respectively connected to the two air inlet chambers 12. The air inlet branches 7 are each provided with a third valve K3 for controlling the on / off of the air inlet branch 7. By controlling the on / off of the two third valves K3, the regenerated gas output by the heat exchanger 4 can be controlled to enter the predetermined air inlet chamber 12. For example, by opening the third valve K3 on the left and closing the third valve K3 on the right, the regenerated gas discharged from the heat exchanger 4 will enter the air inlet chamber 12 on the left.

[0035] Through the above arrangement, the two water storage chambers 11 in the present device can operate alternately, that is, when the water in one water storage chamber 11 is in the normal heating stage, the water in the other water storage chamber 11 is in the preheating stage; for example, taking the left water storage chamber 11 as being normally heated and the right water storage chamber 11 as being preheated:

[0036] First, open the first valve K1, the second valve K2 on the left, and the third valve K3 on the right, and close the first valve K1, the second valve K2, and the third valve K3 on the left; at this time, the regenerated gas discharged from the adsorption tower directly enters the heat exchanger 4, and at the same time, the water pump 3 draws the water in the left water storage chamber 11 through the left water outlet branch 5 and enters the heat exchanger 4 to exchange heat with the regenerated gas entering the heat exchanger 4, so as to heat the water. The heated water flows back from the left water inlet branch 6 into the left water storage chamber 11 and is drawn out again by the water pump 3. This cycle is repeated, so that the heat of the regenerated gas heats the water in the left water storage chamber 11; at the same time, the regenerated gas after heat exchange with water in the heat exchanger 4 is discharged from the gas outlet end of the heat exchanger 4 and passes through the right The air intake branch 7 enters the right air intake chamber 12, and then flows from the air intake chamber 12 into the right heat exchange tube bundle to exchange heat with the water in the right water storage chamber 11, thereby preheating the water in the right water storage chamber 11. After the water temperature in the left water storage chamber 11 rises to a predetermined temperature, the water in the left water storage chamber 11 is discharged and water is reintroduced into the left water storage chamber 11. Then, the first valve K1 and the second valve K2 on the left side, and the third valve K3 on the right side are closed, and the first valve K1 and the second valve K2 on the right side, and the third valve K3 on the left side are opened. In this way, the regenerated air in the heat exchanger 4 will normally heat the water in the preheated water storage chamber 11 on the right side. At the same time, the regenerated air discharged from the heat exchanger 4 will preheat the water in the left water storage chamber 11. Repeating the above operation can make the two water storage chambers 11 operate alternately to fully recover the waste heat in the regenerated air.

[0037] In order to replenish water in the water storage chamber 11, the present device also includes two water replenishment branches 8 connected in parallel at the water outlet end of the water source, where the water source can be municipal tap water; the two water replenishment branches 8 are respectively connected to the two water storage chambers 11, and the water replenishment branches 8 are each provided with a fifth valve K5 for controlling the on-off of the water replenishment branch 8. In this way, when you want to replenish water for the water storage chamber 11 on the left, you can close the two second valves K2 and the fifth valve K5 on the right at the same time, and tap water can enter the water storage chamber 11 on the left from the water replenishment branch 8 to achieve water replenishment.

[0038] The specific structures of the water storage chamber 11 and the air inlet chamber 12 in this embodiment are as follows:

[0039] The water storage container includes two relatively independent tank bodies 1. The tops of the tank bodies 1 are opened to form open ends. The internal spaces of the two tank bodies 1 respectively constitute the two chambers mentioned above.

[0040] like Figure 2 As shown, the preheating mechanism includes an upper tube sheet 21 and a lower tube sheet 23 respectively fixed to the two ends of the heat exchange tube bundle; a step portion 14 extending circumferentially along the tank body 1 is provided inside the tank body 1, and the upper tube sheet 21 is detachably covered on the top of the tank body 1, for example, the upper tube sheet 21 is mounted on the top of the tank body 1 by screws; the lower tube sheet 23 abuts against the top of the step portion 14, so that a water storage chamber 11 is formed inside the tank body 1 between the upper tube sheet 21 and the lower tube sheet 23, and the air inlet chamber 12 is formed inside the tank body 1 below the lower tube sheet 23.

[0041] In order to improve the sealing between the step portion 14 and the lower tube plate 23 , in this embodiment, a sealing ring 15 is embedded between the step portion 14 and the lower tube plate 23 , and the lower tube plate 23 presses the sealing ring 15 vertically against the top surface of the step portion 14 .

[0042] In addition, in order to drain the water in the water storage chamber 11, in this embodiment, a drainage pipe 91 is provided at the bottom of the water storage chamber 11 for draining the water in the water storage chamber 11. A drainage valve K6 is provided on the drainage pipe 91. As long as the drainage valve K6 is opened, the water in the water storage chamber 11 can be drained.

[0043] In addition, since condensed water is generated in the heat exchange tube bundle during the heat exchange between the regenerated gas and the water in the water storage chamber 11, in order to allow the condensed water to be discharged smoothly out of the heat exchange tube bundle, in this embodiment:

[0044] The heat exchange tube bundle includes a plurality of straight heat exchange tubes 22, one end of the heat exchange tube 22 is connected to the air inlet chamber 12 to form the air inlet side, and the other end is connected to the external environment to form the air outlet side. Specifically, the upper end of the heat exchange tube 22 passes through the upper tube plate 21 to form the air outlet side, and the lower end passes through the lower tube plate 23 to form the air inlet side; the air inlet side of the heat exchange tube 22 is lower than the air outlet side. For example, the heat exchange tube 22 can be arranged vertically or inclined, and the condensed water generated in the heat exchange tube 22 can flow out of the heat exchange tube 22 downward under its own weight, and finally flow into the air inlet chamber 12, so that the condensed water will not accumulate too much in the heat exchange tube 22.

[0045] It is understandable that in order to facilitate the discharge of condensed water in the air intake chamber 12 , in this embodiment, a condensed water pipeline 92 for discharging condensed water in the air intake chamber 12 is provided at the bottom of the air intake chamber 12 , and a fourth valve K4 is provided on the condensed water pipeline 92 .

[0046] In order to uniformly discharge the regenerated gas discharged from the outlet side of the heat exchange tube 22, as shown in FIG. Figure 2 As shown, a cover body 131 is fixed on the upper part of the upper tube plate 21, and the upper tube plate 21 and the cover body 131 form an air outlet chamber 13. The air outlet side of the heat exchange tube bundle is connected to the air outlet chamber 13; the air outlet chamber 13 is connected to the air outlet pipeline 93, and the air outlet pipeline 93 is provided with a sixth valve K7.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A dryer waste heat replacement hot water recovery device, comprising a water storage container, a heat exchanger, and a water pump. The water pump draws water from the water storage container into the heat exchanger to achieve heat exchange with the regeneration gas entering the heat exchanger. The device is characterized in that: The water storage container includes two independent chambers, each of which includes an air inlet chamber and a water storage chamber that are isolated from each other; a preheating mechanism is provided in the water storage chamber, and the preheating mechanism includes a heat exchange tube bundle, the air inlet side of the heat exchange tube bundle is connected to the air inlet chamber, and the air outlet side is connected to the external environment; the two water storage chambers can be switchably connected in parallel to the water inlet end of the water pump, and the two water storage chambers can be switchably connected in parallel to the water outlet end of the heat exchanger; the air inlet end of the heat exchanger is used to receive regeneration gas, and the two air inlet chambers can be switchably connected in parallel to the air outlet end of the heat exchanger.

2. A dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: The water inlet end of the water pump is connected in parallel with two water outlet branches respectively connected to the two water storage chambers, and each water outlet branch is provided with a first valve for controlling the on / off of the water outlet branch; and / or the water outlet end of the heat exchanger is connected in parallel with two water inlet branches respectively connected to the two water storage chambers, and each water inlet branch is provided with a second valve for controlling the on / off of the water inlet branch.

3. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: The air outlet end of the heat exchanger is connected in parallel with two air inlet branches which are respectively connected with the two air inlet chambers. The air inlet branches are each provided with a third valve for controlling the on / off of the air inlet branches.

4. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: A drainage pipeline for draining water from the water storage chamber is provided at the bottom of the water storage chamber, and a drainage valve is provided on the drainage pipeline.

5. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: A condensed water pipeline for discharging condensed water in the air intake chamber is provided at the bottom of the air intake chamber, and a fourth valve is provided on the condensed water pipeline.

6. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: The device also includes two water supply branches connected in parallel at the water outlet of the water source, the two water supply branches are respectively connected to the two water storage chambers, and each of the water supply branches is provided with a fifth valve for controlling the on-off of the water supply branch.

7. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: The heat exchange tube bundle includes a plurality of straight heat exchange tubes, one end of the heat exchange tube is connected to the air inlet chamber to form an air inlet side, and the other end is connected to the external environment to form an air outlet side. The air inlet side of the heat exchange tube is lower than the air outlet side.

8. The dryer waste heat replacement hot water recovery device according to claim 1, characterized in that: The water storage container includes two tank bodies, and the top of the tank body is opened; the preheating mechanism includes an upper tube plate and a lower tube plate respectively fixed to the two ends of the heat exchange tube bundle; a step portion extending along the circumference of the tank body is provided inside the tank body, and the upper tube plate is detachably covered on the top of the tank body, and the lower tube plate abuts against the top of the step portion, so that a water storage chamber is formed inside the tank body between the upper tube plate and the lower tube plate, and the air intake chamber is formed inside the tank body below the lower tube plate.

9. The dryer waste heat replacement hot water recovery device according to claim 8, characterized in that: A cover body is fixed on the upper part of the upper tube plate, and an air outlet chamber is formed between the upper tube plate and the cover body. The air outlet side of the heat exchange tube bundle is connected to the air outlet chamber; the air outlet chamber is connected to an air outlet pipeline, and the air outlet pipeline is provided with a sixth valve.

10. The dryer waste heat replacement hot water recovery device according to claim 8, characterized in that: A sealing ring is embedded between the step portion and the lower tube plate.

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