Gas-liquid dual-purpose waste heat recovery device

Abstract

The gas-liquid dual-purpose waste heat recovery device comprises a base, a support, a pump machine, a tubular heat exchanger, a three-way pipe and a switching mechanism, the switching mechanism comprises a first valve seat, a second valve seat, a ball valve and an actuator, and a first channel and a second channel are formed in the ball valve; a first through hole, a second through hole, a third through hole and a fourth through hole are formed in the outer wall of the ball valve, an annular groove is formed in the outer side of the second through hole, the first through hole and the second through hole communicate with the two ends of the first channel correspondingly, and the fourth through hole and the annular groove communicate with the two ends of the second channel correspondingly. And the third through hole is communicated with the middle position of the second channel. Gas and / or liquid can be conveyed into the tubular heat exchanger, so that independent heat exchange of the gas or the liquid or simultaneous heat exchange of the gas or the liquid is achieved, the working mode is flexible and changeable, the function singleness of existing waste heat recovery equipment is improved, and then the practicability of the equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and particularly to a gas-liquid dual-purpose waste heat recovery device. Background Art

[0002] In the process of industrial production, various waste heats or waste heats are often generated. For example, the flue gas after the combustion of an electric boiler contains a large amount of heat, and the cooling tower generates a liquid carrying heat during the process of cooling the flue gas. Both of these gases or liquids contain a large amount of heat. If they can be recycled (such as for heating or power generation), the effective utilization of waste heat will be realized, which is beneficial to energy conservation and emission reduction.

[0003] Existing waste heat recovery devices usually have relatively single functions. For example, a flue gas waste heat recovery device disclosed in Patent CN222418051U and a gas heat recovery device based on heat pipes disclosed in Patent CN222378865U can only realize the waste heat recovery of gases; another example is the rectification tower bottom liquid waste heat recovery device disclosed in Patent CN220135888U and a steam condensate waste heat recovery system disclosed in Patent CN219757024U, which can only realize the waste heat recovery of liquids. Therefore, the functions of the above waste heat recovery devices are not perfect enough to simultaneously realize the waste heat recovery of various gaseous or liquid materials.

[0004] For this reason, the purpose of the present invention is to design a new type of waste heat recovery device to realize the waste heat recovery of various materials such as flue gas, steam, and liquid. Summary of the Invention

[0005] To achieve the above object, the present invention discloses a gas-liquid dual-purpose waste heat recovery device, which includes a base, a bracket, a pump, a shell-and-tube heat exchanger, a three-way pipe, and a switching mechanism. The pump is fixedly arranged on the base, the shell-and-tube heat exchanger is supported by the bracket above the base and the pump, the pump is connected to the three-way pipe through a pipeline, the three-way pipe is connected to the shell-and-tube heat exchanger, the switching mechanism includes a first valve seat, a second valve seat, a ball valve, and an actuator. The ball valve is rotatably arranged at the intersection of the channels inside the three-way pipe. A first valve seat is provided on each of the upper and lower sides of the ball valve, the outer edge of the first valve seat is fixedly connected to the inner wall of the three-way pipe, the second valve seat is fixedly arranged on the inner wall of the three-way pipe on one side of the ball valve, the actuator is arranged on the outer wall of the three-way pipe and is in transmission connection with the central position of the ball valve. The ball valve internally is respectively provided with a first channel and a second channel. The outer wall of the ball valve is respectively provided with a first through hole, a second through hole, a third through hole, and a fourth through hole in a cross shape. An annular groove is provided outside the second through hole. The first through hole and the second through hole are respectively communicated with both ends of the first channel. The fourth through hole and the annular groove are respectively communicated with both ends of the second channel. The third through hole is communicated with the middle position of the second channel.

[0006] Further, both the first channel and the second channel are arranged around the central position of the ball valve and are not connected to each other.

[0007] Further, a first one-way valve is arranged in the second through hole, and the first one-way valve controls the fluid to flow from the inside of the ball valve to the outside thereof.

[0008] Further, a second one-way valve is arranged in the third through hole, and the second one-way valve controls the fluid to flow from the inside of the ball valve to the outside thereof.

[0009] Further, a conical flow guiding sleeve is arranged in the liquid inlet of the tee pipe, and a third one-way valve is arranged at the outlet of the conical flow guiding sleeve, and the third one-way valve controls the fluid to flow from the outside of the ball valve to the inside thereof.

[0010] Further, the first one-way valve includes a valve body with both ends open, a valve core with one end open and one end closed, and a tension spring. The valve core is movably arranged in the valve body. The tension spring is arranged in the valve core and is fixedly connected to the valve body and the valve core at both ends respectively. A plurality of outlets are formed around the valve core near its closed end.

[0011] Further, the valve body is connected to the inner wall of the second through hole in a threaded manner.

[0012] Further, the second one-way valve includes a valve seat and a valve plate. The valve seat is connected to the inner wall of the third through hole in a threaded manner. A groove is arranged inside the valve seat. The outer edge of the valve plate is movably connected to the groove through a plurality of guide posts. A return spring is sleeved on each guide post, and the return spring presses the valve plate against the second channel side.

[0013] Further, the shell-and-tube heat exchanger includes a shell, a feed inlet, a discharge outlet, a medium inlet, a medium outlet, and a plurality of hollow heat exchange tubes. The feed inlet and the discharge outlet are respectively arranged on both sides of the bottom of the shell. The medium inlet and the medium outlet are respectively arranged on both sides of the top of the shell. The plurality of hollow heat exchange tubes are arranged axially in a circular matrix inside the shell, and both ends of the hollow heat exchange tubes are respectively communicated with the feed inlet and the discharge outlet, and the outside of the hollow heat exchange tubes is communicated with the medium inlet and the medium outlet.

[0014] Further, the actuator is a motor or a rotary cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By arranging a pump, a tee pipe, and a switching mechanism, the present invention can transport gas and / or liquid into the shell-and-tube heat exchanger, so as to realize the separate heat exchange of gas or liquid, or realize the simultaneous heat exchange of both, with a flexible working mode, improving the functional singleness of the existing waste heat recovery equipment, and further improving the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is an axial structural sectional view of the shell-and-tube heat exchanger in the present invention;

[0020] Figure 3 It is a schematic diagram of the gas heat exchange mode of the switching mechanism in the present invention;

[0021] Figure 4 is Figure 3 a partial enlarged view of the structure at A in;

[0022] Figure 5 is Figure 3 a partial enlarged view of the structure at B in;

[0023] Figure 6 It is a schematic diagram of the liquid heat exchange mode of the switching mechanism in the present invention;

[0024] Figure 7 It is a schematic diagram of the gas-liquid heat exchange mode of the switching mechanism in the present invention.

[0025] Reference numerals:

[0026] 10 - Base;

[0027] 20 - Bracket;

[0028] 30 - Pump;

[0029] 40 - Shell-and-tube heat exchanger, 41 - Shell, 42 - Feed inlet, 43 - Discharge outlet, 44 - Medium inlet, 45 - Medium outlet, 46 - Hollow heat exchange tube;

[0030] 50 - Three-way pipe, 51 - Gas inlet, 52 - Liquid inlet, 53 - Fluid outlet, 54 - Conical flow guiding sleeve;

[0031] 60 - Switching mechanism, 61 - First valve seat, 62 - Second valve seat, 63 - Ball valve, 64 - Actuator, 65 - First channel, 66 - Second channel, 67 - First through hole, 68 - Second through hole, 69 - Third through hole, 610 - Fourth through hole, 611 - Annular groove;

[0032] 70 - Pipeline;

[0033] 80 - First one - way valve, 81 - valve body, 82 - valve core, 83 - tension spring, 84 - outlet;

[0034] 90 - Second one - way valve, 91 - valve seat, 92 - valve plate, 93 - groove, 94 - guide post, 95 - return spring;

[0035] 100 - Third one - way valve. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indication also changes accordingly.

[0038] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0039] In the description of the embodiments, unless otherwise clearly specified and limited, terms such as "set", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or connected through an intermediate medium, or it can also be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] As Figure 1-2 shown, the gas - liquid dual - purpose waste heat recovery device in this embodiment includes a base 10, a bracket 20, a pump 30, a shell - and - tube heat exchanger 40, a three - way pipe 50, and a switching mechanism 60. The pump 30 is fixedly arranged on the base 10, the shell - and - tube heat exchanger 40 is supported above the base 10 and the pump 30 through the bracket 20, the pump 30 is connected to the three - way pipe 50 through a pipeline 70, the three - way pipe 50 is connected to the shell - and - tube heat exchanger 40, and the main structure of the switching mechanism 60 is arranged inside the three - way pipe 50; among them, the pump 30 can adopt the existing technologies in the art.

[0041] The shell and tube heat exchanger 40 includes a shell 41, a feed port 42, a discharge port 43, a medium inlet 44, a medium outlet 45 and a plurality of hollow heat exchange tubes 46. The feed port 42 and the discharge port 43 are respectively arranged on both sides of the bottom of the shell 41, and the medium inlet 44 and the medium outlet 45 are respectively arranged on both sides of the top of the shell 41. The plurality of hollow heat exchange tubes 46 are arranged axially in a circular matrix manner inside the shell 41, and the two ends of the hollow heat exchange tubes 46 are respectively connected to the feed port 42 and the discharge port 43, and the outside of the hollow heat exchange tubes 46 is connected to the medium inlet 44 and the medium outlet 45.

[0042] The feed port 42 is connected to the fluid outlet 53 of the three-way pipe 50 , and the fluid after heat exchange is discharged from the discharge port 43 . The medium inlet 44 and the medium outlet 45 are used for introducing and recovering the heat exchange medium, respectively.

[0043] The three-way pipe 50 also includes a gas inlet 51 and a liquid inlet 52. The gas inlet 51 is used to introduce waste gas, flue gas or steam to be heat exchanged. The liquid inlet 52 is connected to the pump 30, and waste water or other waste liquid to be heat exchanged is introduced through the pump 30.

[0044] like Figure 3 As shown, the switching mechanism 60 includes a first valve seat 61, a second valve seat 62, a ball valve 63 and an actuator 64. The ball valve 63 is rotatably arranged at the intersection of the channels inside the three-way pipe 50. A first valve seat 61 is provided on the upper and lower sides of the ball valve 63. The outer edge of the first valve seat 61 is fixedly connected to the inner wall of the three-way pipe 50. The second valve seat 62 is fixedly arranged on the inner wall of the three-way pipe 50 on one side of the ball valve 63. An opening is provided on the first valve seat 61, and the second valve seat 62 is a closed structure.

[0045] The actuator 64 is arranged on the outer wall of the tee 50 and is transmission-connected to the center position of the ball valve 63. The actuator 64 is a motor or a rotary cylinder, and its drive shaft passes through the outer wall of the tee 50 and is connected to the ball valve 63. A sealing measure such as a rotary sealing ring or a mechanical seal is adopted between the drive shaft and the outer wall of the tee 50 to prevent air or liquid leakage.

[0046] The ball valve 63 is internally provided with a first channel 65 and a second channel 66. Both channels are arranged around the center of the ball valve 63 and are not interconnected. A first through-hole 67, a second through-hole 68, a third through-hole 69, and a fourth through-hole 610 are formed in a cross-shaped pattern on the outer wall of the ball valve 63. An annular groove 611 is provided outside the second through-hole 68. The first through-hole 67 and the second through-hole 68 communicate with the ends of the first channel 65, respectively. The fourth through-hole 610 and the annular groove 611 communicate with the ends of the second channel 66, respectively. The third through-hole 69 communicates with the center of the second channel 66. The actuator 64 drives the ball valve 63 to rotate, switching between different fluid channels.

[0047] A first one-way valve 80 is provided in the second through hole 68, and the first one-way valve 80 controls the flow of fluid from the inside of the ball valve 63 to the outside thereof. A second one-way valve 90 is provided in the third through hole 69, and the second one-way valve 90 controls the flow of fluid from the inside of the ball valve 63 to the outside thereof. A conical flow guide sleeve 54 is provided in the liquid inlet 52 of the tee 50, and a third one-way valve 100 is provided at the outlet of the conical flow guide sleeve 54, and the third one-way valve 100 controls the flow of fluid from the outside of the ball valve 63 to the inside thereof.

[0048] As Figure 4 shown, the first one-way valve 80 includes a valve body 81 with both ends open, a valve core 82 with one end open and the other end closed, and a tension spring 83. The valve body 81 is connected to the inner wall of the second through hole 68 in a threaded manner. The valve core 82 is movably arranged in the valve body 81. The tension spring 83 is arranged in the valve core 82 and is fixedly connected to the valve body 81 and the valve core 82 at both ends respectively. A plurality of outlets 84 are formed around the valve core 82 near its closed end.

[0049] In the initial state, the valve core 82 and the plurality of outlets 84 are completely located inside the valve body 81. When the valve core 82 bears the fluid pressure, it is pushed up, so that the outlets 84 are exposed, and thus the fluid can flow through the outlets 84. After the pressure on the valve core 82 disappears, the valve core 82 resets under the action of the tension spring 83.

[0050] As Figure 5 shown, the second one-way valve 90 and the third one-way valve 100 have the same structure. Taking the structure of the second one-way valve 90 as an example, it includes a valve seat 91 and a valve plate 92. The valve seat 91 is connected to the inner wall of the third through hole 69 in a threaded manner. A groove 93 is provided inside the valve seat 91. The outer edge of the valve plate 92 is movably connected to the groove 93 through a plurality of guide posts 94. A return spring 95 is sleeved on each guide post 94.

[0051] In the initial state, the return spring 95 presses the valve plate 92 against the side of the second channel 66. When the valve plate 92 bears the fluid pressure, the valve plate 92 slides along the guide posts 94 and compresses the spring, so that the fluid flows through the gap between the valve plate 92 and the valve seat 91. After the fluid pressure disappears, the valve plate 92 resets under the action of the return spring 95.

[0052] The present invention has three working modes. The working principle of the present invention will be described below with reference to the accompanying drawings:

[0053] Mode 1: Gas heat exchange

[0054] As Figure 3As shown in the figure, in the gas heat exchange mode, the actuator 64 drives the ball valve 63 to rotate, aligning the second through hole 68 with the gas inlet 51 of the three-way pipe 50. The gas is sent in through the gas inlet 51. At this time, the first one-way valve 80 is in the reverse cut-off state, and the gas can only enter the second channel 66 through the outer annular groove 611, and then is discharged from the fluid outlet 53 through the fourth through hole 610 and enters the shell and tube heat exchanger 40 for heat exchange, thereby realizing the waste heat recovery of the gas.

[0055] When the gas passes through the third through hole 69, the second one-way valve 90 is in the reverse cut-off state, and the gas cannot be discharged from the second one-way valve 90. Therefore, it can only be discharged through the fourth through hole 610.

[0056] The third through hole 69 is aligned with the liquid inlet 52. At this time, although the third one-way valve 100 is in the conducting state, the second one-way valve 90 is in the reverse cut-off state. Therefore, even if liquid is sent into the liquid inlet 52, it cannot enter the inside of the ball valve 63, thereby ensuring that only the gas heat exchange mode is in operation.

[0057] Mode 2: Liquid heat exchange

[0058] As Figure 6 shown in the figure, in the liquid heat exchange mode, the actuator 64 drives the ball valve 63 to rotate, aligning the second through hole 68 with the liquid inlet 52 of the three-way pipe 50. The liquid is sent in through the liquid inlet 52. At this time, the first one-way valve 80 is in the reverse cut-off state, and the third one-way valve 100 is in the conducting state. The liquid enters the annular groove 611 through the third one-way valve 100 and enters the second channel 66 through the annular groove 611. At this time, the second one-way valve 90 in the third through hole 69 is in the conducting state, and the liquid will be discharged from the fluid outlet 53 through the second one-way valve 90 and enter the shell and tube heat exchanger 40 for heat exchange, thereby realizing the waste heat recovery of the liquid.

[0059] The first through hole 67 is aligned with the gas inlet 51. At this time, even if gas is sent into the gas inlet 51, since the third one-way valve 100 is in the reverse cut-off state, the gas can neither enter the second channel 66 nor flow back reversely from the liquid inlet 52, thereby ensuring that only the liquid heat exchange mode is in operation.

[0060] Mode 3: Gas-liquid heat exchange

[0061] As Figure 7As shown, in the gas-liquid heat exchange mode, the fourth through-hole 610 is aligned with the gas inlet 51, and the first through-hole 67 is aligned with the liquid inlet 52. The gas is fed through the gas inlet 51, enters the second channel 66 through the fourth through-hole 610, then enters the fluid outlet 53 through the annular groove 611, and finally enters the shell-and-tube heat exchanger 40 for gas heat exchange. At the same time, the liquid is fed through the liquid inlet 52. At this time, the third one-way valve 100 is in the conducting state. The liquid enters the first channel 65 through the third one-way valve 100 and the first through-hole 67. At this time, the first one-way valve 80 in the second through-hole 68 is also in the conducting state. The liquid will be discharged from the fluid outlet 53 through the first one-way valve 80 and enter the shell-and-tube heat exchanger 40 for heat exchange, so as to realize the common waste heat recovery of gas and liquid.

[0062] In summary, through the settings of the pump 30, the tee 50 and the switching mechanism 60, the present invention can transport gas and / or liquid into the shell-and-tube heat exchanger 40, so as to realize the separate heat exchange of gas or liquid, or realize the simultaneous heat exchange of both. The working mode is flexible and changeable, improving the single function of the existing waste heat recovery equipment, and thus improving the practicability of the equipment.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those skilled in the art to implement; when the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A gas-liquid dual-purpose waste heat recovery device, characterized in that: It includes a base, a bracket, a pump, a shell-and-tube heat exchanger, a tee pipe, and a switching mechanism. The pump is fixedly arranged on the base. The shell-and-tube heat exchanger is supported by the bracket and arranged above the base and the pump. The pump is connected to the tee pipe through a pipeline. The tee pipe is connected to the shell-and-tube heat exchanger. The switching mechanism includes a first valve seat, a second valve seat, a ball valve, and an actuator. The ball valve is rotatably arranged at the intersection of the channels inside the tee pipe. There is a first valve seat on each of the upper and lower sides of the ball valve. The outer edge of the first valve seat is fixedly connected to the inner wall of the tee pipe. The second valve seat is fixedly arranged on the inner wall of the tee pipe on one side of the ball valve. The actuator is arranged on the outer wall of the tee pipe and is in transmission connection with the central position of the ball valve. The ball valve is internally provided with a first channel and a second channel respectively. The outer wall of the ball valve is respectively provided with a first through hole, a second through hole, a third through hole, and a fourth through hole in a cross shape. An annular groove is arranged outside the second through hole. The first through hole and the second through hole are respectively communicated with the two ends of the first channel. The fourth through hole and the annular groove are respectively communicated with the two ends of the second channel. The third through hole is communicated with the middle position of the second channel.

2. The gas-liquid dual-purpose waste heat recovery device according to claim 1, wherein: Both the first channel and the second channel are arranged around the central position of the ball valve and are not communicated with each other.

3. The gas-liquid dual-purpose waste heat recovery device according to claim 1, characterized in that: A first one-way valve is arranged in the second through hole, and the first one-way valve controls the fluid to flow from the inside of the ball valve to the outside.

4. The gas-liquid dual-purpose waste heat recovery device according to claim 1, wherein: A second one-way valve is arranged in the third through hole, and the second one-way valve controls the fluid to flow from the inside of the ball valve to the outside.

5. The gas-liquid dual-purpose waste heat recovery device according to claim 1, characterized in that: A conical flow guide sleeve is arranged in the liquid inlet of the tee pipe, and a third one-way valve is arranged at the outlet of the conical flow guide sleeve. The third one-way valve controls the fluid to flow from the outside of the ball valve to the inside.

6. The gas-liquid dual-purpose waste heat recovery device according to claim 3, wherein: The first one-way valve includes a valve body with both ends open, a valve core with one end open and one end closed, and a tension spring. The valve core is movably arranged in the valve body. The tension spring is arranged in the valve core and is fixedly connected to the valve body and the valve core at both ends respectively. A plurality of outlets are arranged around the valve core near its closed end.

7. The gas-liquid dual-purpose waste heat recovery device according to claim 6, characterized in that: The valve body is connected to the inner wall of the second through hole in a threaded manner.

8. The gas-liquid dual-purpose waste heat recovery device according to claim 4, characterized in that: The second one-way valve includes a valve seat and a valve plate. The valve seat is connected to the inner wall of the third through hole in a threaded manner. A groove is arranged inside the valve seat. The outer edge of the valve plate is movably connected to the groove through a plurality of guide posts. A return spring is sleeved on each guide post, and the return spring presses the valve plate against the second channel side.

9. The gas-liquid dual-purpose waste heat recovery device according to claim 1, characterized in that: The shell-and-tube heat exchanger includes a shell, a feed inlet, a discharge outlet, a medium inlet, a medium outlet, and a plurality of hollow heat exchange tubes. The feed inlet and the discharge outlet are respectively arranged on both sides of the bottom of the shell. The medium inlet and the medium outlet are respectively arranged on both sides of the top of the shell. The plurality of hollow heat exchange tubes are arranged axially in a circular matrix inside the shell, and both ends of the hollow heat exchange tubes are respectively communicated with the feed inlet and the discharge outlet. The outside of the hollow heat exchange tubes is communicated with the medium inlet and the medium outlet.

10. The gas-liquid dual-purpose waste heat recovery device according to claim 1, wherein: The actuator is a motor or a rotary cylinder.

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