Secondary waste heat recovery device suitable for non-woven fabric drying box

Abstract

The utility model discloses a secondary waste heat recovery device suitable for a non-woven fabric drying box, and relates to the technical field of environmental protection and energy conservation, the secondary waste heat recovery device comprises a drying box and a water tank used for soaking cloth, and a heat source is arranged in the drying box and used for drying the soaked cloth; the first-stage energy saver is provided with a fresh air flow channel and a first-stage hot air flow channel which are isolated from each other, and the second-stage energy saver is provided with a second-stage hot air flow channel and a liquid flow channel which are isolated from each other; the air inlet end of the fresh air flow channel communicates with the external environment, and the air outlet end communicates with the drying box. The two ends of the first-stage hot air flow channel communicate with the drying box and the second-stage hot air flow channel correspondingly. The second-stage hot air flow channel further communicates with the external environment. The cold water end of the liquid runner communicates with a water source, and the hot water end communicates with the water tank; gas in the first-stage hot air flow channel exchanges heat with gas in the fresh air flow channel; and gas in the second-stage hot air flow channel exchanges heat with liquid in the liquid flow channel. The two energy savers act synergistically, the heat utilization rate is increased, and heat energy emission is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection and energy conservation, and particularly relates to a secondary waste heat recovery device applicable to a non-woven fabric drying oven. Background Art

[0002] During the production of non-woven fabrics, they need to be placed in a specifically formulated impregnating processing liquid, which may contain various chemicals, additives, or functional substances aimed at endowing the non-woven fabrics with specific properties such as waterproofing, breathability, or antibacterial properties. Through sufficient stirring or mechanical action, it is ensured that the processing liquid uniformly and deeply penetrates into the fibers or firmly adheres to the surface of the base fabric. Subsequently, the non-woven fabric enters a drying device, such as a hot air dryer or a far-infrared dryer, and uses a uniform and controllable heat source to evaporate the moisture and solvents in the non-woven fabric. At the same time, drying also promotes the curing of the chemical components or functional substances in the processing liquid inside or on the surface of the fibers, thereby stabilizing the performance of the non-woven fabric. During the drying process, the temperature and time need to be precisely controlled to ensure that the non-woven fabric is neither overheated and deformed nor the processing liquid is completely cured. After drying, the non-woven fabric may also need to undergo subsequent treatments such as calendering and cooling to improve its surface flatness and dimensional stability. For example, the patent document with the publication number CN113293604B adopts the above process flow.

[0003] In actual production, the hot air used for drying non-woven fabrics in the drying device is usually directly discharged into the air. These exhaust gases usually have a temperature of about 85°C and a relative humidity of not less than 60%. Direct discharge is a waste of thermal energy and may also have an adverse impact on the surrounding environment, such as increasing the local temperature and humidity, affecting the environmental comfort, and possibly exacerbating the urban heat island effect.

[0004] Therefore, there is an urgent need to provide a secondary waste heat recovery device applicable to a non-woven fabric drying oven to solve the above technical problems. Summary of the Invention

[0005] In view of the problems in the related art, the utility model provides a secondary waste heat recovery device applicable to a non-woven fabric drying oven, which can reduce the heat emission to the environment and improve the thermal utilization rate.

[0006] The utility model is implemented as follows:

[0007] A secondary waste heat recovery device applicable to a non-woven fabric drying oven includes a drying oven and a water tank. A heat source is provided inside the drying oven; the water tank is used for soaking the fabric, and the drying oven is used for drying the soaked fabric; it includes a primary energy saver and a secondary energy saver;

[0008] The primary energy saver includes a fresh air flow channel and a primary hot air flow channel that are isolated from each other; the secondary energy saver includes a secondary hot air flow channel and a liquid flow channel that are isolated from each other;

[0009] The fresh air flow path includes an air inlet end and an air outlet end; the air inlet end is communicated with the external environment, and the air outlet end is communicated with the drying box; one end of the primary hot air flow path is communicated with the drying box, and the other end is communicated with the secondary hot air flow path; the secondary hot air flow path is communicated with the external environment; the liquid flow path includes a cold water end and a hot water end; the cold water end is communicated with a water source, and the hot water end is communicated with the water tank;

[0010] The gas in the primary hot air flow path exchanges heat with the gas in the fresh air flow path; the gas in the secondary hot air flow path exchanges heat with the liquid in the liquid flow path.

[0011] The primary hot air flow path and the fresh air flow path, or the secondary hot air flow path and the liquid flow path are grouped in pairs. That is, they are physically separated to keep the two media separated, and also allow heat to be transferred between the two media.

[0012] In the drying box, the fabric is dried by the combination of the built-in heat source and the fresh air. The generated hot air first passes through the primary energy saver. Here, the heat of the hot air is absorbed by the fresh air in the fresh air flow path, so that the fresh air is converted into hot air and enters the drying box again to dry the fabric, thereby reducing the energy consumption for preheating the fresh air.

[0013] Subsequently, the hot air continues to pass through the secondary energy saver. At this stage, the heat of the hot air is absorbed by the liquid in the liquid flow path to generate hot water. These hot waters are used for the pre-soaking treatment of the fabric, and the soaked fabric is then sent to the drying box for drying. This process reduces the energy consumption required to heat the fabric to the drying temperature.

[0014] Through the synergistic effect of the primary energy saver and the secondary energy saver, the effective recovery and utilization of the heat contained in the hot air discharged from the drying box are realized, the overall heat energy emission is significantly reduced, and the energy utilization efficiency is improved. This design not only saves energy but also reduces the thermal pollution to the environment.

[0015] The above-mentioned water source refers to the water or other solutions used for soaking the fabric, not specifically water.

[0016] As a further optimization of the above solution, the primary energy saver includes two opposite end faces; a plurality of first pipes are connected between the two end faces; both ends of the first pipe form openings on the two end faces respectively; the inner cavities of the plurality of first pipes form the primary hot air flow path;

[0017] An outer cover is provided on the outer peripheral side of the plurality of first pipes. The outer cover is connected to the end face to form a sealed cavity inside; the air inlet end and the air outlet end are opened on the outer cover; the gap between the outer cover and the first pipe forms the fresh air flow path.

[0018] The gases on the inner and outer sides of the first pipeline are isolated from each other through the first pipeline, and heat exchange is completed simultaneously. Further, the first pipeline is made of metal.

[0019] As a further optimization of the above solution, the first pipeline is a flat pipeline.

[0020] The flat pipeline is beneficial to increasing the heat exchange contact surface of the media on the inner and outer sides, improving the heat exchange effect and efficiency.

[0021] As a further optimization of the above solution, the air inlet end is close to the secondary energy saver; the air outlet end is close to the drying oven.

[0022] The position settings of the air inlet end and the air outlet end on the primary energy saver can adjust the flow direction of the fresh air flow channel to be opposite to the flow direction of the primary hot air flow channel, forming countercurrent heat exchange. The two media always maintain a large temperature difference during the heat exchange process, which helps the heat to be more effectively transferred from the high-temperature medium to the low-temperature medium, thereby improving the heat exchange efficiency.

[0023] As a further optimization of the above solution, the secondary energy saver includes a housing with openings at both ends and one or more heat exchange tubes provided in the middle; a number of evenly arranged fins are attached to the outer surface of the heat exchange tubes;

[0024] The inner cavity of the heat exchange tube forms the liquid flow channel; the gaps between the openings at both ends of the housing and the fins form the secondary hot air flow channel.

[0025] Further, both the heat exchange tubes and the fins are made of metal; the fins are provided to increase the contact area and improve the heat exchange efficiency.

[0026] As a further optimization of the above solution, the fins are L-shaped bent structures with arc angles formed at the bends; one side of the fins is fixedly attached to the heat exchange tubes; a plurality of the fins are evenly arranged in an array, and gaps are formed between adjacent fins.

[0027] As a further optimization of the above solution, the lower surface of the housing is an inclined surface, and a condensation pipeline is connected to the bottom of the inclined surface and communicates with the water tank.

[0028] The hot and humid air discharged from the drying oven is heat-exchanged through the primary energy saver and the secondary energy saver, and most of the heat is absorbed, and the temperature is reduced. Water droplets can be condensed in the secondary hot air flow channel, collected and guided into the water tank, which can effectively improve the reuse of water, reduce the emission of moisture at the same time, that is, reduce the humidity impact on the environment.

[0029] As a further optimization of the above solution, a water replenishing pipeline is further included, and the water replenishing pipeline communicates with the water tank; a first stop valve is provided on the water replenishing pipeline.

[0030] After soaking the fabric multiple times, the water or other solution in the water tank will gradually decrease and needs to be replenished multiple times; the first shut-off valve is used to open or close the water replenishment pipeline, or control the flow rate of the water replenishment pipeline when it is not completely closed.

[0031] As a further optimization of the above solution, the water replenishment pipeline is located directly above the water tank; the water replenishment pipeline includes a main pipeline, the starting end of the main pipeline is connected to a water source, and the end is branched into a first branch and a second branch; the first branch is connected to the cold water end, and the second branch is connected to the water tank;

[0032] The first shut-off valve is provided on the main pipeline, and a second shut-off valve is also provided on the second branch.

[0033] Through the coordinated cooperation of the first shut-off valve and the second shut-off valve, the water source can be directly introduced into the water tank, or introduced into the secondary energy saver to absorb heat to form hot water, and then introduced into the water tank.

[0034] As a further optimization of the above solution, an exhaust fan is provided at the air inlet end.

[0035] The beneficial effects are as follows:

[0036] The utility model provides a secondary waste heat recovery device applicable to a non-woven fabric drying oven. By setting a primary energy saver and a secondary energy saver, the high-temperature and high-humidity air discharged from the drying oven is heat-exchanged in stages by fresh air and cold water, and the recovered heat is reapplied to the drying oven. Finally, the effective recovery and utilization of the heat contained in the hot air discharged from the drying oven are realized, the overall heat energy emission is significantly reduced, the energy utilization efficiency is improved, and the thermal pollution to the environment is reduced while saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural connection diagram of a secondary waste heat recovery device applicable to a non-woven fabric drying oven provided in Embodiment 1 of the utility model;

[0038] Figure 2 It is a partial structural schematic diagram of the primary energy saver provided in Embodiment 1 of the utility model;

[0039] Figure 3 It is a partial structural schematic diagram of the secondary energy saver provided in Embodiment 1 of the utility model;

[0040] Figure 4 It is a schematic diagram of the cooperation between the heat exchange tube and the fin provided in Embodiment 1 of the utility model;

[0041] Figure 5Schematic structural connection diagram of a secondary waste heat recovery device applicable to a non-woven fabric drying oven provided in Embodiment 2 of the present utility model.

[0042] Reference numerals:

[0043] 1, drying oven;

[0044] 2, water tank;

[0045] 3, primary energy saver; 31, end face; 32, first pipe; 33, outer cover; 34, primary hot air flow channel; 35, fresh air flow channel; 351, air inlet end; 352, air outlet end; 36, fan;

[0046] 4, secondary energy saver; 41, outer shell; 411, inclined surface; 42, heat exchange pipe; 43, fin; 44, secondary hot air flow channel; 45, liquid flow channel; 451, cold water end; 452, hot water end;

[0047] 5, water replenishing pipe; 51, main pipe; 52, first branch; 53, second branch; 54, first stop valve; 55, second stop valve;

[0048] 6, condensation pipe. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0050] Embodiment 1

[0051] As Figures 1 to 4 shown, this embodiment provides a secondary waste heat recovery device applicable to a non-woven fabric drying oven 1, including a drying oven 1 and a water tank 2. A heat source is provided inside the drying oven 1; the water tank 2 is used for soaking the fabric, and the drying oven 1 is used for drying the soaked fabric;

[0052] It further includes a primary energy saver 3 and a secondary energy saver 4.

[0053] The primary energy saver 3 includes a fresh air flow channel 35 and a primary hot air flow channel 34 that are isolated from each other; in this embodiment, the primary energy saver 3 includes two end faces 31 that are opposite to each other; a plurality of flat first pipes 32 are connected between the two end faces 31; both ends of the first pipe 32 form openings on the two end faces 31; the inner cavities of the plurality of first pipes 32 form the primary hot air flow channel 34;

[0054] An outer cover 33 is provided on the outer peripheral side of a plurality of first pipelines 32. The outer cover 33 is connected to the end face 31 to form a sealed cavity inside. An air inlet end 351 and an air outlet end 352 are provided on the outer cover 33. The gap between the outer cover 33 and the first pipeline 32 forms a fresh air flow channel 35.

[0055] The gases on the inner and outer sides of the first pipeline 32 are isolated from each other through the first pipeline 32, and heat exchange is completed simultaneously. The first pipeline 32 is made of aluminum alloy. The flat pipeline is beneficial to increasing the heat exchange contact surface of the media on the inner and outer sides, improving the heat exchange effect and heat exchange efficiency.

[0056] The air inlet end 351 is communicated with the external environment, and the air outlet end 352 is communicated with the drying oven 1. In this embodiment, the air inlet end 351 is close to the secondary energy saver 4; the air outlet end 352 is close to the drying oven 1. The positions of the air inlet end 351 and the air outlet end 352 on the primary energy saver 3 can adjust the flow direction of the fresh air flow channel 35 to make it opposite to the flow direction of the primary hot air flow channel 34, forming countercurrent heat exchange. The two media always maintain a large temperature difference during the heat exchange process, which helps the heat to be more effectively transferred from the high-temperature medium to the low-temperature medium, thereby improving the heat exchange efficiency.

[0057] The secondary energy saver 4 includes a mutually isolated secondary hot air flow channel 44 and a liquid flow channel 45; in this embodiment, the secondary energy saver 4 includes a housing 41 with openings at both ends and a heat exchange tube 42 arranged in a meandering and bending manner in the middle. A plurality of evenly arranged fins 43 are attached to the outer surface of the heat exchange tube 42; both the heat exchange tube 42 and the fins 43 are made of metal; the fins 43 are provided to increase the contact area and improve the heat exchange efficiency. In this embodiment, the fins 43 are L-shaped bending structures, and an arc angle is formed at the bending part; one side of the fins 43 is fixedly attached to the heat exchange tube 42; a plurality of fins 43 are arranged at equal intervals in an array, and a gap is formed between adjacent fins 43.

[0058] The inner cavity of the heat exchange tube 42 forms a liquid flow channel 45; the openings at both ends of the housing 41 and the gaps between the fins 43 form a secondary hot air flow channel 44.

[0059] One end of the primary hot air flow channel 34 is communicated with the drying oven 1, and the other end is communicated with the secondary hot air flow channel 44; the secondary hot air flow channel 44 is communicated with the external environment.

[0060] The liquid flow channel 45 includes a cold water end 451 and a hot water end 452; the cold water end 451 is communicated with a water source, and the hot water end 452 is communicated with the water tank 2. Specifically, in this embodiment, a water replenishing pipeline 5 is further included, located directly above the water tank 2; the water replenishing pipeline 5 includes a main pipeline 51, the starting end of the main pipeline 51 is communicated with the water source, and the end is branched into a first branch 52 and a second branch 53; the first branch 52 is communicated with the cold water end 451, and the second branch 53 is communicated to the water tank 2;

[0061] A first stop valve 54 is provided on the main pipeline 51, and a second stop valve 55 is further provided on the second branch 53.

[0062] After soaking the fabric multiple times, the water or other solution in the water tank 2 will gradually decrease and needs to be replenished multiple times; the first stop valve 54 is used to open or close the water replenishing pipeline 5, or control the flow rate of the water replenishing pipeline 5 when it is not completely closed. Through the coordinated cooperation of the first stop valve 54 and the second stop valve 55, the water source can be directly introduced into the water tank 2, or introduced into the secondary energy saver 4 to absorb heat to form hot water, and then introduced into the water tank 2.

[0063] The gas in the primary hot air flow channel 34 exchanges heat with the gas in the fresh air flow channel 35; the gas in the secondary hot air flow channel 44 exchanges heat with the liquid in the liquid flow channel 45.

[0064] The primary hot air flow channel 34 and the fresh air flow channel 35, or the secondary hot air flow channel 44 and the liquid flow channel 45 are in pairs. They are physically separated to keep the two media separated, and also allow heat to be transferred between the two media.

[0065] In the drying oven 1, the fabric is dried by the combination of the built-in heat source and fresh air. The generated hot air first passes through the primary energy saver 3. Here, the heat of the hot air is absorbed by the fresh air in the fresh air flow channel 35, converting the fresh air into hot air and re-entering the drying oven 1 to dry the fabric, thereby reducing the energy consumption for preheating the fresh air.

[0066] Subsequently, the hot air continues to pass through the secondary energy saver 4. At this stage, the heat of the hot air is absorbed by the liquid in the liquid flow channel 45 to generate hot water. These hot waters are used for the pre-soaking treatment of the fabric, and the soaked fabric is then sent to the drying oven 1 for drying. This process reduces the energy consumption required to heat the fabric to the drying temperature.

[0067] Through the synergistic effect of the primary energy saver 3 and the secondary energy saver 4, the effective recovery and utilization of the heat contained in the hot air discharged from the drying oven 1 are realized, significantly reducing the overall heat energy emission and improving the energy utilization efficiency. This design not only saves energy but also reduces the thermal pollution to the environment.

[0068] Embodiment 2

[0069] This embodiment is as Figure 5 shown. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is:

[0070] In this embodiment, an exhaust fan 36 is provided at the air inlet end 351 for sucking in fresh air.

[0071] In this embodiment, the secondary energy saver 4 is located above the water tank 2. The downward-facing side of the outer shell 41 is an inclined surface 411, and a condensation pipeline 6 is connected to the bottom of the inclined surface 411 and communicates with the water tank 2.

[0072] The hot and humid air discharged from the drying oven 1 exchanges heat through the primary energy saver 3 and the secondary energy saver 4, and most of its heat is absorbed, causing the temperature to drop. Water droplets can condense in the secondary hot air flow channel 44, and after being collected, they are guided into the water tank 2. This can effectively improve the reuse of water, reduce the emission of moisture at the same time, that is, reduce the humidity impact on the environment.

[0073] Based on the disclosure and teachings of the above specification, those skilled in the art of the present utility model can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims

1. A secondary waste heat recovery device suitable for a non-woven fabric drying box, comprising a drying box and a water tank, wherein a heat source is provided in the drying box; the water tank is used to soak the fabric, and the drying box is used to dry the soaked fabric; the characteristics are: Includes primary energy saver and secondary energy saver; The first-level energy saver includes a fresh air flow channel and a first-level hot air flow channel that are isolated from each other; the second-level energy saver includes a second-level hot air flow channel and a liquid flow channel that are isolated from each other; The fresh air flow channel includes an air inlet end and an air outlet end; the air inlet end is connected to the external environment, and the air outlet end is connected to the drying box; one end of the first-level hot air flow channel is connected to the drying box, and the other end is connected to the second-level hot air flow channel; the second-level hot air flow channel is connected to the external environment; the liquid flow channel includes a cold water end and a hot water end; the cold water end is connected to the water source, and the hot water end is connected to the water tank; The gas in the primary hot air flow channel exchanges heat with the gas in the fresh air flow channel; the gas in the secondary hot air flow channel exchanges heat with the liquid in the liquid flow channel.

2. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 1, characterized in that: The primary energy saver comprises two end surfaces which are opposite to each other; a plurality of first pipes are connected between the two end surfaces; two ends of the first pipes respectively form openings on the two end surfaces; the inner cavities of the plurality of first pipes form the primary hot air flow channel; An outer cover is provided on the outer peripheral side of the plurality of first pipes, and the outer cover is connected to the end surface to form a closed cavity inside; the air inlet end and the air outlet end are opened on the outer cover; the gap between the outer cover and the first pipe forms the fresh air flow channel.

3. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 2 is characterized in that: The first pipe is a flat pipe.

4. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 2, characterized in that: The air inlet end is close to the secondary energy saver; the air outlet end is close to the drying box.

5. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 1, characterized in that: The secondary economizer comprises a shell, the two ends of which are open, and one or more heat exchange tubes are arranged in the middle; the outer surface of the heat exchange tube is fitted with a plurality of evenly arranged fins; The inner cavity of the heat exchange tube forms the liquid flow channel; the openings at both ends of the shell and the gaps between the fins form the secondary hot air flow channel.

6. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 5, characterized in that: The fin is an L-shaped bending structure, and an arc angle is formed at the bending part; one side of the fin is fitted and fixed to the heat exchange tube; a plurality of the fins are arranged in an evenly spaced array, and gaps are formed between adjacent fins.

7. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 5, characterized in that: The downward side of the shell is an inclined surface, and a condensation pipe is connected to the bottom of the inclined surface, and the condensation pipe is connected to the water tank.

8. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 1, characterized in that: It also includes a water supply pipeline, which is connected to the water tank; a first stop valve is arranged on the water supply pipeline.

9. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 8, characterized in that: The water supply pipeline is located directly above the water tank; the water supply pipeline includes a main pipeline, the starting end of the main pipeline is connected to the water source, and the end of the main pipeline is split to form a first branch channel and a second branch channel; the first branch channel is connected to the cold water end, and the second branch channel is connected to the water tank; The first stop valve is arranged on the main pipeline, and the second branch channel is also provided with a second stop valve.

10. The secondary waste heat recovery device suitable for a non-woven fabric drying box according to claim 1, characterized in that: An exhaust fan is provided at the air inlet end.

Images