Flue gas waste heat utilization device

Abstract

The utility model discloses a flue gas waste heat utilization device which comprises a first heat exchange end, a plurality of second heat exchange ends and a conveying end, the first heat exchange end is used for transferring heat from high-temperature flue gas to cold fluid to obtain hot fluid, and the second heat exchange ends are connected to a device to be heated in a sleeved mode to obtain hot fluid. A fin is formed between the second heat exchange end and the to-be-heated device, the hot fluid is located in the fin, and the conveying end is located between the first heat exchange end and the second heat exchange end and used for communicating the first heat exchange end with the second heat exchange end and conveying the hot fluid into the second heat exchange end. Compared with the prior art, the flue gas waste heat utilization device has the advantages that heat in high-temperature flue gas can be recycled conveniently, the heat of the high-temperature flue gas is reduced, and the influence of the heat generated after the high-temperature flue gas is exhausted on the environment is reduced; and drying, reaction heating and the like can be carried out by utilizing waste heat of recovered flue gas, so that heat energy recycling is realized, and energy conservation and environmental protection are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas waste heat utilization, and in particular relates to a flue gas waste heat utilization device. Background Art

[0002] Powders synthesized by liquid phase method, such as calcium carbonate synthesized by liquid phase method, solid particles after gas-liquid-solid three-phase reaction, etc., often need to be dried before final packaging and use. Even if the slurry containing solid particles is subjected to solid-liquid separation operations such as plate and frame filter pressing and centrifugation, the separated solid still contains a certain amount of water and cannot be in powder state. Therefore, further drying is a common powder processing step. At present, steam is often used for drying, which is costly, has a high carbon footprint, and is not economical overall.

[0003] Powder synthesis sites are often close to steel plants, cement plants, chemical parks, etc., and chemical plants also produce a large amount of industrial flue gas / waste gas with heat. These flue gases are currently basically discharged through chimneys, with a very low utilization rate, resulting in energy waste. Direct discharge through chimneys also causes certain pollution to the environment. Therefore, there is an urgent need for a flue gas waste heat utilization device that can effectively utilize this part of the factory waste heat to solve the above problems.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The purpose of the utility model is to provide a flue gas waste heat utilization device, which can solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] A flue gas waste heat utilization device comprises a first heat exchange end, a plurality of second heat exchange ends and a delivery end, wherein the first heat exchange end is used to transfer heat from high-temperature flue gas to a cold fluid and obtain a hot fluid, the plurality of second heat exchange ends are sleeved on a device to be heated, a fin is formed between the second heat exchange end and the device to be heated, the hot fluid is located in the fin, and the delivery end is located between the first heat exchange end and the second heat exchange end, and is used to connect the first heat exchange end and the second heat exchange end, and to deliver the hot fluid to the second heat exchange end.

[0008] In one or more embodiments of the present invention, the first heat exchange end includes a shell, a heat exchange tube is installed inside the shell, the heat exchange tube is used to pass the cold fluid, the shell has a hot fluid inlet end and a hot fluid outlet end, the hot fluid inlet end and the hot fluid outlet end are respectively arranged at the two ends of the first heat exchange end, the high-temperature flue gas enters the first heat exchange end from the hot fluid inlet end and is discharged from the hot fluid outlet end, and realizes heat exchange with the cold fluid in the heat exchange tube.

[0009] In one or more embodiments of the present invention, an anti-wear component is disposed inside the first heat exchange end, the anti-wear component is used to block impurities in the flue gas, and the anti-wear component is disposed on one end of the inner wall of the first heat exchange end close to the hot fluid inlet end.

[0010] In one or more embodiments of the present invention, the anti-wear assembly includes a plurality of wear-resistant plates, a plurality of first through holes are opened on the wear-resistant plates, the plurality of wear-resistant plates are fixedly connected to the inner wall of the first heat exchange end, and the first through holes on adjacent wear-resistant plates are staggered.

[0011] In one or more embodiments of the present invention, a collecting component matching the anti-wear component is installed at the lower end of the first heat exchange end, and the collecting component is used to collect impurities processed by the anti-wear component.

[0012] In one or more embodiments of the present invention, a third through hole matching the anti-wear component is formed at the lower end of the first heat exchange end, and the collecting component includes a collecting box matching the third through hole, the collecting box is fixedly connected to the first heat exchange end, a second through hole is formed at the lower end of the collecting box, a flange is provided on the side wall of the second through hole, and a baffle is slidably connected to the flange.

[0013] In one or more embodiments of the present invention, an anti-backflow plate is provided on the inner wall of the collection box.

[0014] In one or more embodiments of the present invention, the second heat exchange end comprises a heat exchange sleeve, which is sleeved on the device to be heated, with fins formed between the heat exchange sleeve and the device to be heated, and the delivery end is used to deliver the hot fluid into the fins.

[0015] In one or more embodiments of the present invention, an output pipe is fixedly connected to one side wall of the heat exchange jacket, and the output pipe is used to discharge the hot fluid in the fins.

[0016] In one or more embodiments of the present invention, a plurality of heat collecting sheets matching the device to be heated are fixedly connected to the inner wall of the heat exchange sleeve.

[0017] Compared with the prior art, the flue gas waste heat utilization device of the utility model is convenient for recycling the heat in the high-temperature flue gas, reducing the heat of the high-temperature flue gas and reducing the impact of the heat of the high-temperature flue gas on the environment after being discharged;

[0018] The waste heat of the recovered flue gas can also be used to heat the device to be heated, realizing the recycling of heat energy and saving energy and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of a flue gas waste heat utilization device in one embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of the first heat exchange end in one embodiment of the utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle;

[0023] Figure 4 This is a schematic structural diagram of the second heat exchange end in one embodiment of the utility model;

[0024] Figure 5 A cross-sectional view of the second heat exchange end in one embodiment of the utility model Figure 1 ;

[0025] Figure 6 A cross-sectional view of the second heat exchange end in one embodiment of the utility model Figure 2 .

[0026] Description of main reference numerals:

[0027] 1. First heat exchange end; 11. Shell; 111. Hot fluid inlet end; 112. Hot fluid outlet end; 113. Third through hole; 12. Heat exchange tube; 121. Cold fluid inlet end; 122. Cold fluid outlet end; 2. Delivery end; 3. Second heat exchange end; 31. Heat exchange sleeve; 32. Connecting part; 33. Output pipe; 34. Heat collector; 4. Anti-wear component; 41. Wear-resistant plate; 411. First through hole; 5. Collecting component; 51. Collecting box; 511. Second through hole; 512. Flange; 52. Baffle; 53. Anti-backflow plate; 6. Fin. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] like Figure 1 As shown, a flue gas waste heat utilization device in one embodiment of the utility model includes a first heat exchange end 1 and a plurality of second heat exchange ends 3. The first heat exchange end 1 is used to transfer heat from high-temperature flue gas to cold fluid, thereby obtaining hot fluid. The plurality of second heat exchange ends 3 are respectively sleeved on different devices to be heated. A delivery end 2 is connected between the first heat exchange end 1 and the second heat exchange end 3. The delivery end 2 can deliver the cold fluid after heat exchange to the second heat exchange end 3. Fins 6 are formed between the second heat exchange end 3 and the device to be heated. The hot fluid is located in the fins 6, so as to heat the device to be heated, recycle the heat of the high-temperature flue gas, and save energy and protect the environment.

[0030] Among them, the delivery end 2 can be used in conjunction with a multi-pipe joint, so that the hot fluid obtained through the first heat exchange end 1 is connected to multiple second heat exchange ends 3 to heat multiple devices to be heated. The parallel use of hot fluids is realized. When the amount of hot fluid is large enough, it can be used in parallel, thereby reducing the waste of hot fluids. Of course, when the amount of hot fluid is small, the delivery end 2 can also be a separate pipeline, and the delivery end 2 is connected to a second heat exchange end 3, and one second heat exchange end 3 corresponds to a device to be heated, so that the hot fluid can be fully utilized.

[0031] like Figure 1 to Figure 3 As shown, the first heat exchange end 1 includes a shell 11, and the shell 11 has a hot fluid inlet end 111 and a hot fluid outlet end 112, and the hot fluid inlet end 111 and the hot fluid outlet end 112 are respectively arranged at the two ends of the first heat exchange end 1. A heat exchange tube 12 is arranged inside the first heat exchange end 1, and a cold fluid inlet end 121 and a cold fluid outlet end 122 are respectively arranged at the two ends of the heat exchange tube 12, and the delivery end 2 is connected to the cold fluid outlet end 122, and the cold fluid enters the heat exchange tube 12 from the cold fluid inlet end 121 and is delivered to the delivery end 2 from the cold fluid outlet end 122. When the high-temperature flue gas passes through the hot fluid inlet end 111, the high-temperature flue gas exchanges heat with the heat exchange tube 12, and the heat exchange tube 12 exchanges heat with the cold fluid in the heat exchange tube 12, thereby realizing heat recovery, and the high-temperature flue gas is not easy to pollute the cold fluid in the heat exchange tube 12. At the same time, the temperature of the high-temperature flue gas is reduced, making the temperature of the high-temperature flue gas even lower, and avoiding as much as possible the impact of the high temperature of the exhausted flue gas on the surrounding environment.

[0032] Generally, there will be some waste residues generated by the process in the high-temperature flue gas, and the waste residues will enter the shell 11 along with the high-temperature flue gas. The waste residues will enter the shell 11 along with the high-temperature flue gas, causing wear on the heat exchange tube 12, thereby reducing the service life of the first heat exchange end 1. In order to solve the above problem, Figure 1-2 As shown, an anti-wear component 4 is provided at one end of the first heat exchange end 1 close to the hot fluid inlet end 111. The anti-wear component 4 is used to block impurities in the flue gas and avoid friction between the impurities and the heat exchange tube 12 as much as possible, which causes wear of the heat exchange tube 12 and affects the service life of the first heat exchange end 1.

[0033] like Figure 2 As shown, the anti-wear assembly 4 includes a plurality of wear-resistant plates 41, which are generally high temperature resistant and wear-resistant plates, such as steel plates, alloy plates, iron plates, etc. The wear-resistant plates 41 are provided with a plurality of first through holes 411, which can pass high temperature flue gas and some impurities, and the first through holes 411 play a filtering role. If there are a plurality of wear-resistant plates 41, the plurality of wear-resistant plates 41 are generally arranged horizontally, and the first through holes 411 on adjacent wear-resistant plates 41 are arranged staggered with each other.

[0034] When the anti-wear assembly 4 is in use, impurities in the high-temperature flue gas contact the frontmost wear-resistant plate 41, and the impurities contact the surface of the wear-resistant plate 41, and the impurities are blocked by the wear-resistant plate 41. If some impurities pass through the frontmost wear-resistant plate 41, the second wear-resistant plate 41 can block the impurities passing through the frontmost wear-resistant plate 41, thereby filtering the impurities. At the same time, the impurities in the high-temperature flue gas are reduced, thereby reducing the wear of the heat exchange tube 12 caused by the impurities.

[0035] Furthermore, Figure 2 As shown, the heat exchange tube 12 is in a coil shape with a gap between the upper layer and the lower layer, and the first through hole 411 on the last wear-resistant plate 41 matches the gap, that is, impurities are not easy to contact the front of the heat exchange tube 12 after passing through the wear-resistant plate 41, further reducing the wear of the heat exchange tube 12 caused by impurities.

[0036] like Figure 2-3 As shown, a collecting component 5 matching the anti-wear component 4 is installed at the lower end of the first heat exchange end 1. The collecting component 5 is used to collect impurities processed by the anti-wear component 4. The collecting component 5 collects impurities and facilitates unified processing of impurities.

[0037] Specifically, Figure 2-3As shown, the lower end of the first heat exchange end 1 is provided with a third through hole 113 matching the anti-wear component 4, and the collection component 5 includes a collection box 51 matching the third through hole 113, and the collection box 51 can collect impurities. The collection box 51 is fixedly connected to the first heat exchange end 1 and matches the position of the third through hole 113. The lower end of the collection box 51 is provided with a second through hole 511, and a flange 512 is provided on the side wall of the second through hole 511. A baffle 52 matching the flange 512 is slidably connected to the collection box 51. The baffle 52 can completely block the second through hole 511. When the baffle 52 blocks the second through hole 511, the second through hole 511 is a box body with an opening at the upper end. When the baffle 52 does not block the second through hole 511, the impurities in the collection box 51 leak out from the second through hole 511, thereby realizing the collection of impurities.

[0038] like Figure 3 As shown, the inner wall of the collection box 51 is provided with an anti-backflow plate 53, and the anti-backflow plate 53 is tiltedly arranged on the inner wall of the collection box 51. The anti-backflow plate 53 plays a role of guiding flow and can simultaneously reduce the entrance of the collection box 51, thereby avoiding as much as possible the situation where impurities in the collection component 5 are lifted up by high-temperature flue gas.

[0039] like Figure 1 to Figure 6 As shown, the second heat exchange end 3 includes a heat exchange sleeve 31, which is sleeved on the device to be heated, and a fin 6 is formed between the heat exchange sleeve 31 and the device to be heated. An output pipe 33 is fixedly connected to one side wall of the heat exchange sleeve 31, and the output pipe 33 is used to discharge the hot fluid in the fin 6. After the hot fluid in the fin 6 undergoes heat exchange, its temperature will become low, and the hot fluid is discharged from the fin 6 to reduce the heat of the hot fluid, thereby reducing the impact of the hot fluid on the environment.

[0040] like Figure 1 to Figure 6 As shown, the second heat exchange end 3 further includes a connection portion 32, which is arranged on the heat exchange sleeve 31. When the heat exchange sleeve 31 is sleeved on the device to be heated, the connection portion 32 can lock the heat exchange sleeve 31. The connection portion 32 can be a zipper connection portion, a buckle connection portion, a button connection portion, a bolt connection portion, etc.

[0041] like Figure 6 As shown, the inner wall of the heat exchange sleeve 31 is fixedly connected with a plurality of heat collecting fins 34 matching the device to be heated. The heat collecting fins 34 can increase the resistance of the thermal fluid in the fins 6, increase the heat exchange area between the thermal fluid and the device to be heated, and improve the heat exchange efficiency.

[0042] Among them, multiple second heat exchange ends 3 can be connected in series through the output pipe 33, that is, the heating temperatures of different types of devices to be heated may be different, and they can be connected in series through the output pipe 33, that is, after the first heat exchange of the hot fluid, the second and third heat exchange can be performed, so that the heat after the heat exchange of the high-temperature flue gas is utilized to the extreme. Then the hot fluid is discharged, further reducing the heat of the discharged hot fluid. The outlet end of the output pipe 33 is connected to the inlet end of the cold fluid to form a fluid cycle and save energy consumption.

[0043] When using, Figure 1 As shown, firstly, the second heat exchange end 3 is installed on the device to be heated, and then the high-temperature flue gas is introduced into the first heat exchange end 1. The impurities in the high-temperature flue gas contact the anti-wear component 4, and some impurities are intercepted by the anti-wear component 4, reducing the possibility of friction between the impurities and the heat exchange tube 12. The intercepted impurities fall down along the surface of the anti-wear component 4 into the collection component 5, and the collection component 5 collects the impurities, which is convenient for uniform treatment of the impurities. When the high-temperature flue gas passes through the heat exchange tube 12, it exchanges heat with the heat exchange tube 12, and the heat exchange tube 12 exchanges heat with the cold fluid in the heat exchange tube 12, and obtains hot fluid, which is transported to the second heat exchange end 3 and the fins 6 formed by the device to be heated through the transport end 2. The hot fluid heats the device to be heated, realizing the utilization of the waste heat of the flue gas.

[0044] The heat exchange tube 12 is circulated with liquid or gas, specifically water or air, wherein the heat exchange efficiency of water is higher than the temperature efficiency of air, that is, liquid fluid is generally preferred. High-temperature flue gas is introduced into the first heat exchange end 1, and the high-temperature flue gas exchanges heat with the cold fluid in the heat exchange tube 12. After the cold fluid becomes hot, it is used for drying in the process, and the temperature of the fluid becomes low, and it is recycled and input into the heat exchange tube 12 to complete the recycling of the fluid.

[0045] The utility model is convenient for recycling heat in high-temperature flue gas, reducing the heat of high-temperature flue gas and the impact of the heat after the high-temperature flue gas is discharged on the environment. The waste heat of the recovered flue gas can also be used for drying, reaction heating, etc., to achieve heat energy recycling and energy saving and environmental protection.

[0046] It is obvious 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 regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flue gas waste heat utilization device, characterized in that: include: The first heat exchange end is used to transfer heat from the high-temperature flue gas to the cold fluid and obtain a hot fluid; A plurality of second heat exchange ends are sleeved on the device to be heated, fins are formed between the second heat exchange ends and the device to be heated, and the hot fluid is located in the fins; The delivery end is located between the first heat exchange end and the second heat exchange end, and is used to connect the first heat exchange end and the second heat exchange end, and to deliver the hot fluid to the second heat exchange end.

2. The flue gas waste heat utilization device according to claim 1, characterized in that: The first heat exchange end comprises a shell, a heat exchange tube is installed inside the shell, and the heat exchange tube is used to pass the cooling fluid; The shell has a hot fluid inlet end and a hot fluid outlet end, and the hot fluid inlet end and the hot fluid outlet end are respectively arranged at two ends of the first heat exchange end. The high-temperature flue gas enters the first heat exchange end from the hot fluid inlet end and is discharged from the hot fluid outlet end, and realizes heat exchange with the cold fluid in the heat exchange tube.

3. A flue gas waste heat utilization device according to claim 2, characterized in that: An anti-wear component is disposed inside the first heat exchange end, and the anti-wear component is used to block impurities in the flue gas. The anti-wear component is disposed on an end of the inner wall of the first heat exchange end close to the hot fluid inlet end.

4. The flue gas waste heat utilization device according to claim 3, characterized in that: The anti-wear assembly includes a plurality of wear-resistant plates, a plurality of first through holes are formed on the wear-resistant plates, a plurality of the wear-resistant plates are fixedly connected to the inner wall of the first heat exchange end, and the first through holes on adjacent wear-resistant plates are staggered.

5. The flue gas waste heat utilization device according to claim 4, characterized in that: A collecting component matching the anti-wear component is installed at the lower end of the first heat exchange end, and the collecting component is used to collect impurities processed by the anti-wear component.

6. The flue gas waste heat utilization device according to claim 5, characterized in that: A third through hole matching the anti-wear component is provided at the lower end of the first heat exchange end; The collecting assembly comprises a collecting box matching the third through hole, the collecting box is fixedly connected to the first heat exchange end, a second through hole is opened at the lower end of the collecting box, a flange is arranged on the side wall of the second through hole, and a baffle is slidably connected to the flange.

7. The flue gas waste heat utilization device according to claim 6, characterized in that: The inner wall of the collection box is provided with a backflow prevention plate.

8. The flue gas waste heat utilization device according to claim 1, characterized in that: The second heat exchange end comprises a heat exchange sleeve, the heat exchange sleeve is sleeved on the device to be heated, fins are formed between the heat exchange sleeve and the device to be heated, and the delivery end is used to deliver the hot fluid into the fins.

9. The flue gas waste heat utilization device according to claim 8, characterized in that: An output pipe is fixedly connected to one side wall of the heat exchange jacket, and the output pipe is used to discharge the hot fluid in the fins.

10. A flue gas waste heat utilization device according to claim 8 or 9, characterized in that: The inner wall of the heat exchange sleeve is fixedly connected with a plurality of heat collecting sheets matching the device to be heated.

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