Waste heat recovery device

Abstract

The utility model discloses a waste heat recovery device, which relates to the technical field of waste heat recovery and comprises a shell and a heat exchange part, a containing cavity is arranged in the shell, one end of the shell is provided with an air inlet and a liquid outlet, and the other end of the shell is provided with an air outlet and a liquid inlet. The heat exchange part is located in the containing cavity and comprises a separation layer ceramic membrane, a transition layer ceramic membrane and a supporting layer ceramic membrane, a penetrating membrane hole is formed in the transition layer ceramic membrane in the length direction of the transition layer ceramic membrane, and the two ends of the membrane hole communicate with the air inlet and the air outlet correspondingly. A liquid channel is formed between the outer wall of the heat exchange part and the cavity wall of the containing cavity in a spaced mode, and the two ends of the liquid channel communicate with the liquid inlet and the liquid outlet correspondingly. Compared with the prior art, in the heat exchange process, the hot regeneration gas and the cold rich liquid form reverse indirect contact, the hot regeneration gas can enter the multiple membrane holes at the same time and make contact with the multiple separation layer ceramic membranes in the multiple membrane holes, the contact area is large, and the waste heat recovery effect of the cold rich liquid on the hot regeneration gas is good.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a waste heat recovery device. Background Technology

[0002] The novel membrane waste heat recovery device is a type of equipment used to recover waste heat during chemical absorption processes. Chemical absorption is a common physical absorption process used to separate specific components from a gas mixture. This process typically generates a large amount of waste heat, which the novel membrane waste heat recovery device can utilize to improve energy efficiency. This device is a highly efficient and environmentally friendly energy recovery technology that fully utilizes waste heat during chemical absorption, improving energy efficiency, reducing energy consumption and environmental pollution. In the rich liquid splitting process, the hot regenerated gas exchanges heat with the split cold rich liquid, thereby recovering the waste heat from the regenerated gas. Furthermore, if water vapor in the regenerated gas can be transferred to the rich liquid during the waste heat recovery process, bringing additional convective heat transfer (triggered by mass transfer), it will further enhance the waste heat recovery performance.

[0003] Existing novel membrane waste heat recovery devices typically introduce hot regeneration gas into a pipe, and a cold rich liquid located outside the pipe absorbs the heat from the hot regeneration gas inside the pipe to achieve heat recovery. However, due to the small contact area between the hot regeneration gas and the pipe, the waste heat recovery efficiency of the cold rich liquid is poor. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a waste heat recovery device to solve the technical problem that the contact area between the pipeline and the hot regeneration gas in the existing novel membrane waste heat recovery device is small, resulting in poor waste heat recovery effect of cold rich liquid recovering hot regeneration gas.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a waste heat recovery device, comprising:

[0007] The outer casing has an internal cavity; one end of the outer casing has an air inlet and a liquid outlet, and the other end has an air outlet and a liquid inlet.

[0008] A heat exchanger is located in the accommodating cavity. The heat exchanger includes a separation layer ceramic membrane, a transition layer ceramic membrane, and a support layer ceramic membrane. The transition layer ceramic membrane has multiple through-holes, and the two ends of each hole are connected to the air inlet and the air outlet, respectively. The wall of each hole is connected to the separation layer ceramic membrane. The support layer ceramic membrane is disposed on the outer wall of the transition layer ceramic membrane. A liquid channel is formed between the outer wall of the transition layer ceramic membrane and the cavity wall of the accommodating cavity, and the two ends of the liquid channel are connected to the liquid inlet and the liquid outlet, respectively.

[0009] In some embodiments, the plurality of membrane pores are arranged in a parallel and circular array.

[0010] In some embodiments, the accommodating cavity is provided with a plurality of heat-conducting pipes, and both ends of each heat-conducting pipe are connected to the air inlet and the air outlet.

[0011] In some embodiments, the thickness of the transition layer ceramic membrane is greater than the thickness of the separation layer ceramic membrane.

[0012] In some embodiments, the membrane pores are continuously curved.

[0013] In some embodiments, the diameter of the membrane pores is 2nm-30nm.

[0014] In some embodiments, both the inlet and the outlet have flange connections.

[0015] In some embodiments, both the liquid inlet and the liquid outlet are located between the air inlet and the air outlet.

[0016] In some embodiments, there are multiple heat exchangers, all of which are located in the accommodating cavity and spaced apart. Each heat exchanger has a membrane pore that connects to the air inlet and the air outlet.

[0017] In some embodiments, the housing is made of stainless steel.

[0018] Compared with existing technologies, the waste heat recovery device provided by this utility model has an air inlet that can be used to connect to hot regeneration gas, allowing the hot regeneration gas to simultaneously enter multiple membrane pores through the air inlet and then flow out from the air outlet. The cold rich liquid can enter the liquid channel through the liquid inlet and then flow out from the liquid outlet. The hot regeneration gas and the cold rich liquid form a reverse indirect contact. Because the hot regeneration gas can simultaneously enter multiple membrane pores and contact multiple separation layer ceramic membranes inside the multiple membrane pores, the contact area is large, resulting in a good waste heat recovery effect of the cold rich liquid on the hot regeneration gas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the waste heat recovery device provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the waste heat recovery device provided in this embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the heat exchange component provided in this embodiment of the utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] To address the technical problem that the small contact area between the pipeline and the hot regenerated gas in existing novel membrane waste heat recovery devices leads to poor waste heat recovery efficiency of cold rich liquid, this invention provides a waste heat recovery device that can improve the heat exchange efficiency of the waste heat recovery device and enhance the preheating recovery effect of the hot regenerated gas.

[0024] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a waste heat recovery device in one embodiment of the present invention. The waste heat recovery device includes a shell 1 and a heat exchange component 2. The shell 1 is provided with a accommodating cavity 11. One end of the shell 1 is provided with an air inlet 12 and a liquid outlet 13, and the other end is provided with an air outlet 14 and a liquid inlet 15.

[0025] The heat exchanger 2 is located in the accommodating cavity 11. The heat exchanger 2 includes a separation layer ceramic membrane 21, a transition layer ceramic membrane 22 and a support layer ceramic membrane 23. The transition layer ceramic membrane 22 has a plurality of through membrane holes 221 along its length direction. The two ends of the membrane holes 221 are respectively connected to the air inlet 12 and the air outlet 14. A liquid channel 16 is formed between the outer wall of the transition layer ceramic membrane 22 and the cavity wall of the accommodating cavity 11. The two ends of the liquid channel 16 are respectively connected to the liquid inlet 15 and the liquid outlet 13.

[0026] In this embodiment, the air inlet 12 supplies heated regenerated gas into the membrane pores 221 and then discharges it from the air outlet 14. The cold rich liquid enters the liquid channel from the liquid inlet 15 and then flows out from the liquid outlet 13. Since the transition layer ceramic membrane 22 is made of hydrophilic ceramic material, it has heat and mass coupling transfer characteristics. During heat exchange, the heated regenerated gas and the cold rich liquid form a reverse indirect contact. The water vapor in the heated regenerated gas directly transfers heat to the cold rich liquid through direct transfer and condensation followed by diffusion, thereby enhancing the recovery of waste heat from the regenerated gas by the cold rich liquid. Furthermore, the heated regenerated gas simultaneously contacts multiple separation layer ceramic membranes 21 in multiple membrane pores 221, resulting in a large contact area and good waste heat recovery effect from the heated regenerated gas by the cold rich liquid.

[0027] In one embodiment, please refer to Figure 2 and Figure 3 Multiple membrane pores 221 are arranged in a parallel, circular array. In this embodiment, the multiple membrane pores 221 are arranged in a circular array, so that the hot regeneration gas can pass through the multiple membrane pores 221 evenly, resulting in uniform heat conduction. The multiple membrane pores 221 can also be arranged in other ways, such as in a rectangular array or an irregular, random arrangement, as long as the hot regeneration gas can pass through the multiple membrane pores 221 simultaneously.

[0028] In one embodiment, the accommodating cavity 11 is provided with multiple heat-conducting pipes (not shown in the figure), each of which is connected to an air inlet 12 and an air outlet 14 at both ends. The hot regeneration gas entering through the air inlet 12 can pass through multiple membrane holes 21 and multiple heat-conducting pipes simultaneously, which is beneficial to further improve the thermal conductivity of the hot regeneration gas. The heat-conducting pipes are located outside the heat exchanger 2, and the number of heat-conducting pipes can be one or more.

[0029] Both the separation layer ceramic membrane 21 and the transition layer ceramic membrane 22 are made of zirconium oxide, titanium dioxide, and aluminum oxide, giving them good chemical stability. They are resistant to strong acids, strong alkalis, and organic solvents, and can operate stably in various chemical environments. For example, in acid-base separation processes in the chemical industry, the ceramic membranes will not corrode, thus extending their service life. Furthermore, the thickness of the transition layer ceramic membrane 22 is greater than that of the separation layer ceramic membrane 21. Preferably, the thickness of the separation layer ceramic membrane 21 is 16 μm, and the thickness of the transition layer ceramic membrane 22 is 20 μm. This makes the transition layer ceramic membrane 22 slightly less porous than the separation layer ceramic membrane 21. While the separation layer ceramic membrane 21 performs the separation function, facilitating the separation of water vapor from the hot regenerated gas, the more porous transition layer ceramic membrane 22 has a stronger mass transfer capacity. Therefore, the transition layer ceramic membrane 22 can accelerate mass transfer efficiency, thereby improving heat and mass transfer efficiency.

[0030] In one embodiment, the thickness of the support layer ceramic film 23 is 20 μm, and its composition is aluminum oxide. Aluminum oxide has extremely high chemical inertness and can withstand the corrosion of strong acids, strong alkalis and organic solvents, which is beneficial to improving the supporting role of the heat exchange component 2 and making the heat exchange component 2 less prone to deformation or breakage.

[0031] The outer casing 1 is made of stainless steel, which gives it strong hardness and corrosion resistance. The outer casing 1 is not easy to rust and has a long service life.

[0032] In one embodiment, the membrane pore 221 is curved and meandering. In this embodiment, setting the membrane pore 221 to a curved and meandering shape is beneficial to further increase the contact area between the hot regeneration gas and the heat exchanger 2, and further improve the heat exchange efficiency of the hot regeneration gas.

[0033] In one embodiment, please refer to Figure 3 The diameter of the membrane pore 21 is 2nm-30nm. In this embodiment, the membrane pore 221 is cylindrical to facilitate smoother flow of the regenerated gas within it. In a preferred embodiment, the size of the membrane pore 221 is preferably 10nm, allowing the heat exchanger 2 to have a larger number of membrane pores 221, thus maintaining a larger contact area between the regenerated gas and the heat exchanger 2 and achieving higher heat exchange efficiency.

[0034] In one embodiment, please refer to Figure 2 Both the inlet 12 and the outlet 14 are equipped with flange connection plates 121. In this embodiment, the flange connection plates 121 are provided to facilitate the connection of the hot regenerated gas pipeline by screws, which facilitates the quick assembly and disassembly of the hot regenerated gas pipeline.

[0035] In one embodiment, please refer to Figure 2 Both the liquid inlet 15 and the liquid outlet 13 are located between the air inlet 12 and the air outlet 14. In this embodiment, this arrangement allows the cold rich liquid flowing through the liquid channel 16 to fully absorb the heat from the hot regeneration gas in the heat exchanger 2.

[0036] In one embodiment, please refer to Figure 2 The heat exchange components 2 are multiple, all located in the accommodating cavity 11 and spaced apart. Each heat exchange component 2 has a membrane aperture 221 that connects to the air inlet 12 and the air outlet 14. In this embodiment, by using multiple heat exchange components 2, each with a membrane aperture 221, the hot regeneration gas introduced through the air inlet 12 can simultaneously pass through the membrane apertures 221 of multiple heat exchange components 2. This helps to further increase the contact area between the hot regeneration gas and the heat exchange components 2, thereby further improving the heat exchange efficiency of the hot regeneration gas. The number of heat exchange components 2 is not limited; for example, it can be two, three, or more.

[0037] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below:

[0038] The waste heat recovery device provided by this utility model has an air inlet 12 for connecting hot regeneration gas, so that the hot regeneration gas can enter the membrane pores 221 through the air inlet 12 and then flow out from the air outlet 14. The cold rich liquid can enter the liquid channel 16 through the liquid inlet 15 and then flow out from the liquid outlet 13. The hot regeneration gas and the cold rich liquid form a reverse indirect contact. Since the heat exchanger 2 is made of hydrophilic ceramic material, it has heat-mass coupling and transfer characteristics. During the heat exchange process, the water vapor in the hot regeneration gas will transfer heat to the cold rich liquid through direct transfer and condensation followed by diffusion, thereby realizing the enhanced recovery of waste heat of the regeneration gas by the cold rich liquid. Since the hot regeneration gas is in contact with multiple membrane pores 221 at the same time, the contact area with the heat exchanger 2 is large, and the waste heat recovery effect of the cold rich liquid on the hot regeneration gas is good.

[0039] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A waste heat recovery device, characterized in that, include: The outer shell has a cavity inside, and one end of the outer shell has an air inlet and a liquid outlet, while the other end has an air outlet and a liquid inlet. and A heat exchanger is located in the accommodating cavity. The heat exchanger includes a separation layer ceramic membrane, a transition layer ceramic membrane, and a support layer ceramic membrane. The transition layer ceramic membrane has multiple through-holes, and the two ends of each hole are connected to the air inlet and the air outlet, respectively. The wall of each hole is connected to the separation layer ceramic membrane. The support layer ceramic membrane is disposed on the outer wall of the transition layer ceramic membrane. A liquid channel is formed between the outer wall of the transition layer ceramic membrane and the cavity wall of the accommodating cavity, and the two ends of the liquid channel are connected to the liquid inlet and the liquid outlet, respectively.

2. The waste heat recovery device according to claim 1, characterized in that, The multiple membrane pores are arranged in a parallel, circular array.

3. The waste heat recovery device according to claim 1, characterized in that, The accommodating cavity is provided with multiple heat-conducting pipes, and both ends of each heat-conducting pipe are connected to the air inlet and the air outlet.

4. The waste heat recovery device according to claim 1, characterized in that, The thickness of the transition layer ceramic membrane is greater than the thickness of the separation layer ceramic membrane.

5. The waste heat recovery device according to claim 1, characterized in that, The membrane pores are continuously curved.

6. The waste heat recovery device according to claim 1, characterized in that, The diameter of the membrane pores is 2nm-30nm.

7. The waste heat recovery device according to claim 1, characterized in that, Both the inlet and the outlet are equipped with flanges.

8. The waste heat recovery device according to claim 1, characterized in that, Both the liquid inlet and the liquid outlet are located between the air inlet and the air outlet.

9. The waste heat recovery device according to claim 1, characterized in that, The number of heat exchangers is multiple, and the multiple heat exchangers are all located in the accommodating cavity and are spaced apart. The membrane pores in each heat exchanger are connected to the air inlet and the air outlet.

10. The waste heat recovery device according to claim 1, characterized in that, The outer casing is made of stainless steel.

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