Industrial waste heat recovery heat exchange device

Abstract

The utility model provides an industrial waste heat recovery heat exchange device which comprises a flue gas pipeline, a heat exchanger and a baffle assembly, and the heat exchanger comprises a first water tank, a second water tank, a first tube plate, a second tube plate and a plurality of thin-wall heat exchange titanium tubes; the first end of each thin-wall heat exchange titanium tube is in expanded connection with the first tube plate and communicates with the first water tank, and the second end of each thin-wall heat exchange titanium tube is in expanded connection with the second tube plate and communicates with the second water tank; the baffle assembly is arranged at the high-temperature flue gas inlet and comprises a plurality of strip-shaped baffles, and the baffles correspond to the thin-wall heat exchange titanium pipes. According to the heat exchanger, the thin-wall heat exchange titanium tube is adopted, heat transfer efficiency is high, the two ends of the thin-wall heat exchange titanium tube are in expanded connection with the first tube plate and the second tube plate, mounting / dismounting operation is easy, and efficiency is high; the titanium metal has a low-temperature corrosion resistance function, so that waste heat recovery is maximized as much as possible; and the baffle assembly can block and decelerate dust particles in the high-temperature flue gas, so that the service life of the heat exchanger is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, specifically an industrial flue gas recovery heat exchange device. Background Technology

[0002] In existing technologies, heat exchangers for recovering waste heat from industrial flue gas typically use metal heat exchange tubes made of materials such as stainless steel, ND steel, or two-dimensional steel.

[0003] Industrial flue gas often contains acidic gases. Existing metal heat exchangers are susceptible to acid corrosion, resulting in short equipment lifespan (generally 2-3 years), frequent equipment replacement cycles, high costs, and high maintenance costs.

[0004] In existing metal heat exchangers, the heat exchange tubes and supporting tube sheets are fixed by welding. Due to the requirements of the welding process, the wall thickness of the metal heat exchange tubes is generally limited to 2.5-3.0 mm or more. The thick tube wall results in low heat transfer efficiency, poor energy saving effect, and serious waste of heat energy. Summary of the Invention

[0005] This utility model provides an industrial waste heat recovery heat exchange device, which can solve the problems in the prior art where metal heat exchange tubes are susceptible to acid corrosion, resulting in short equipment life, and the use of welding to fix the tube sheet requires thick tube walls, resulting in low heat transfer efficiency.

[0006] To achieve the above-mentioned technical problems, this utility model adopts the following technical solution: an industrial waste heat recovery heat exchange device, comprising:

[0007] The flue gas duct has a high-temperature flue gas inlet at one end and a low-temperature flue gas outlet at the other end.

[0008] A heat exchanger includes a first water tank, a second water tank, a first tube sheet, a second tube sheet, and multiple thin-walled titanium heat exchange tubes; the multiple thin-walled titanium heat exchange tubes pass through the flue gas duct in a direction perpendicular to the axial direction of the flue gas duct; the first end of each thin-walled titanium heat exchange tube is expanded and connected to the first tube sheet and communicates with the first water tank, and the second end of each thin-walled titanium heat exchange tube is expanded and connected to the second tube sheet and communicates with the second water tank; the first water tank is provided with a cooling water inlet and a cooling water outlet;

[0009] The baffle assembly, located at the high-temperature flue gas inlet, includes multiple strip-shaped baffles spaced vertically, with the baffles corresponding to the thin-walled heat exchange titanium tubes.

[0010] The technical solution of this utility model also includes the following additional technical features:

[0011] The wall thickness of the thin-walled heat exchange titanium tube is less than 1.5 mm.

[0012] The first tube sheet has a first annular groove formed on the wall of each of the multiple tube holes, and the first end of the thin-walled heat exchange titanium tube has a first annular protrusion that expands to connect with the first annular groove; the second tube sheet has a second annular groove formed on the wall of each of the multiple tube holes, and the second end of the thin-walled heat exchange titanium tube has a second annular protrusion that expands to connect with the second annular groove.

[0013] The baffle includes an upper part and a lower part. The lower edge of the upper part and the upper edge of the lower part are connected as one piece, so that the baffle forms an angle with the opening facing the side where the thin-walled heat exchange titanium tube is located.

[0014] The baffles and the thin-walled heat exchange titanium tubes are aligned, and the height of the upper edge of each thin-walled heat exchange titanium tube cannot be higher than the height of the upper edge of the upper half of the corresponding baffle, and the height of the lower edge of each thin-walled heat exchange titanium tube cannot be lower than the height of the lower edge of the lower half of the corresponding baffle.

[0015] The multiple thin-walled heat exchange titanium tubes are arranged in multiple first vertical columns and multiple second vertical columns, with the first and second vertical columns staggered. The thin-walled heat exchange titanium tubes in the first vertical column are staggered from the thin-walled heat exchange titanium tubes in the second vertical column. Correspondingly, the multiple strip-shaped baffles are arranged in two rows along the axial direction of the high-temperature flue gas inlet. Each row includes multiple baffles spaced vertically. The baffles in the outer row are aligned with the thin-walled heat exchange titanium tubes in the first vertical column, and the baffles in the inner row are aligned with the thin-walled heat exchange titanium tubes in the second vertical column.

[0016] The industrial waste heat recovery heat exchange device also includes:

[0017] Self-cleaning piping, which includes a main spray line and multiple spray branches;

[0018] The heat exchanger also includes a cover plate, which is fixed above the thin-walled heat exchange titanium tube. Spray nozzles corresponding to the spray branch are respectively provided at the four corners of the cover plate, and the spray nozzles are connected to the water outlets of the spray branch.

[0019] The industrial waste heat recovery heat exchange device also includes:

[0020] A corrosive wastewater discharge pipeline includes a main discharge pipeline and a collection component. The collection component is located below the heat exchanger and is used to collect condensed and dripping corrosive wastewater. The collection component is connected to the main discharge pipeline via a pipeline.

[0021] The heat exchangers are multiple and arranged at intervals along the axial direction of the flue gas duct; the first water tanks of all the heat exchangers are located on the same side, and the second water tanks of all the heat exchangers are located on the opposite side; in two adjacent first water tanks, the cooling water outlet of one first water tank is connected to the cooling water inlet of the other first water tank through a pipeline.

[0022] The internal space of the first water tank is enclosed by the first tube sheet and the first water tank cover plate located outside the first tube sheet. A plurality of first partition plates are provided between the first tube sheet and the first water tank cover plate, which are spaced apart from each other to divide the internal space of the first water tank into a plurality of areas arranged from left to right.

[0023] The internal space of the second water tank is enclosed by the second tube sheet and the second water tank cover plate located outside the second tube sheet. A plurality of second partitions are provided between the second tube sheet and the second water tank cover plate, which are spaced apart from each other to divide the internal space of the second water tank into a plurality of areas arranged from left to right.

[0024] The first partition and the second partition are staggered.

[0025] The flue gas duct is connected to a bypass pipe, the two ends of which are connected between the high-temperature flue gas inlet and the low-temperature flue gas outlet, and are connected in parallel with the flue gas duct of the section where the heat exchanger is located.

[0026] Compared with the prior art, the present invention has the following advantages and positive effects:

[0027] 1. The heat exchanger of this utility model industrial waste heat recovery heat exchange device adopts a thin-walled heat exchange titanium tube, which has high heat transfer efficiency and can achieve the purpose of efficient waste heat recovery.

[0028] 2. The two ends of the thin-walled heat exchange titanium tubes are connected to the first tube sheet and the second tube sheet by expansion joints, which makes the installation / disassembly of the tube bundle convenient and efficient, and can save a lot of equipment manufacturing costs and tube bundle failure repair costs.

[0029] 3. Titanium metal is not easily corroded by acidic substances and has low-temperature corrosion resistance, which can improve the service life of the industrial waste heat recovery heat exchange device of this utility model, making the equipment life up to 10 years. It can safely recover waste heat of 350℃-50℃ in one go, and can even recover waste heat in a wider temperature range, so as to maximize the recovery of waste heat.

[0030] 4. By installing a baffle assembly at the high-temperature flue gas inlet, dust particles in the high-temperature flue gas entering the flue gas duct can be slowed down and blocked, preventing dust particles in the flue gas from hitting the thin-walled heat exchange titanium tubes at high speed and damaging the titanium tubes, thus ensuring the service life of the heat exchanger. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the entire system flow of the industrial waste heat recovery heat exchange device in this utility model embodiment;

[0033] Figure 2 This is a side view of the industrial waste heat recovery heat exchange device in an embodiment of this utility model;

[0034] Figure 3 for Figure 2 View from direction A;

[0035] Figure 4 for Figure 2 View from direction B;

[0036] Figure 5 This is a front view of the baffle assembly in an embodiment of the present utility model;

[0037] Figure 6 for Figure 5 CC-direction sectional view;

[0038] Figure 7 This is a front view of the first tube sheet in an embodiment of this utility model;

[0039] Figure 8 This is a top view of the assembly structure of the thin-walled heat exchange titanium tube with the first water tank and the second water tank in an embodiment of this utility model;

[0040] Figure 9 This is a schematic diagram of the assembly structure of the thin-walled heat exchange titanium tube with the first tube sheet and the second tube sheet in an embodiment of this utility model;

[0041] Figure 10 for Figure 9 Enlarged view of part D.

[0042] Figure label:

[0043] 100. Flue gas duct; 110. High-temperature flue gas inlet; 120. Low-temperature flue gas outlet;

[0044] 200. Heat exchanger; 210. First water tank; 211. Cooling water inlet; 212. Cooling water outlet; 213. First water tank cover; 214. First partition; 220. Second water tank; 221. Second water tank cover; 222. Second partition; 230. First tube sheet; 240. Second tube sheet; 250. Thin-walled titanium heat exchange tube; 251. First annular protrusion; 260. Tube hole; 261. First annular groove; 270. Cooling water pipeline; 280. Cover plate;

[0045] 300. Baffle assembly; 310. Baffle; 311. Upper part; 312. Lower part; 320. Vertical side panel;

[0046] 400. Self-cleaning piping; 410. Main sprinkler line; 420. Branch sprinkler lines;

[0047] 500. Corrosive wastewater discharge pipeline; 510. Main discharge pipeline; 520. Collection components;

[0048] 600. Bypass pipeline;

[0049] 700. Industrial boilers. Detailed Implementation

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0052] Reference Figures 1 to 10 This embodiment discloses an industrial waste heat recovery heat exchange device, including a flue gas duct 100, a heat exchanger 200, and a baffle assembly 300.

[0053] One end of the flue gas duct 100 is a high-temperature flue gas inlet 110, and the other end is a low-temperature flue gas outlet 120. The high-temperature flue gas inlet 110 is connected to an industrial flue gas generating device, such as an industrial boiler 700; the low-temperature flue gas outlet 120 is used to discharge the flue gas after waste heat recovery.

[0054] The heat exchanger 200 includes a first water tank 210, a second water tank 220, a first tube sheet 230, a second tube sheet 240, and multiple thin-walled heat exchange titanium tubes 250. The multiple thin-walled heat exchange titanium tubes 250 pass through the flue gas duct 100 in a direction perpendicular to the axial direction of the flue gas duct 100. This allows the high-temperature flue gas entering the flue gas duct 100 from the high-temperature flue gas inlet 110 to flow through the thin-walled heat exchange titanium tubes 250 from the outside, exchanging heat with the cooling water flowing inside the thin-walled heat exchange titanium tubes 250 to achieve waste heat recovery from the flue gas. Each thin-walled heat exchanger... The first end of each titanium tube 250 is expanded to the first tube sheet 230 and connected to the first water tank 210. The second end of each thin-walled heat exchange titanium tube 250 is expanded to the second tube sheet 240 and connected to the second water tank 220. The first water tank 210 is provided with a cooling water inlet 211 and a cooling water outlet 212. The cooling water before heat exchange enters the first water tank 210 through the cooling water inlet 211, then enters the second water tank 220 through the thin-walled heat exchange titanium tube 250, and finally flows back to the first water tank 210. The cooling water after heat exchange is finally discharged from the cooling water outlet 212.

[0055] by Figure 1 and Figure 2 Taking the flue gas duct 100 as an example (a horizontal duct), the thin-walled heat exchange titanium tubes 250 are also horizontally arranged in multiple vertical columns. Each column includes multiple thin-walled heat exchange titanium tubes 250 spaced vertically. Correspondingly, the first tube sheet 230 and the second tube sheet 240 have tube holes 260 that correspond one-to-one with the thin-walled heat exchange titanium tubes 250. Figure 7 As shown in the first tube sheet 230, the first tube sheet 230 and the second tube sheet 240 have the same structure, which will not be described in detail.

[0056] By using thin-walled titanium heat exchange tubes 250, the heat transfer efficiency of the heat exchanger 200 can be improved, thereby increasing the waste heat recovery efficiency of the entire heat exchange device. The two ends of the thin-walled titanium heat exchange tubes 250 are connected to the first tube sheet 230 and the second tube sheet 240 by expansion joints, making the installation / removal of the tube bundle simple, easy, and efficient, which can significantly save on equipment manufacturing costs and tube bundle failure repair costs. Titanium metal is not easily corroded by acidic substances and has low-temperature corrosion resistance, which can safely recover waste heat from 350℃ to 50℃ in one go, and even recover waste heat within a wider temperature range, maximizing waste heat recovery as much as possible.

[0057] The baffle assembly 300 is located at the high-temperature flue gas inlet 110, specifically inside the flue gas duct 100 and close to the high-temperature flue gas inlet 110. It can be fixed to the inner wall of the flue gas duct 100 by welding or screw fastening. Figure 3 , Figure 5 and Figure 6 As shown, the baffle assembly 300 includes a plurality of strip-shaped baffles 310 arranged at intervals, and the baffles 310 are correspondingly arranged with the thin-walled heat exchange titanium tube 250.

[0058] The baffle assembly 300 also includes vertical side plates 320 arranged on the left and right sides. The two ends of each baffle 310 are respectively fixed to the vertical side plates 320 on both sides, so that the baffle assembly 300 forms a whole, which facilitates the overall disassembly and replacement. All parts of the baffle assembly 300 can be made of stainless steel.

[0059] By installing a baffle assembly 300 at the high-temperature flue gas inlet 110, the gap between two adjacent baffles 310 in the vertical direction ensures that the high-temperature flue gas flows normally into the flue gas duct 100. Each baffle 310 can slow down and block dust particles in the high-temperature flue gas entering the flue gas duct 100, preventing dust particles in the flue gas from hitting the thin-walled heat exchange titanium tube 250 at high speed and damaging the titanium tube, thus ensuring the service life of the heat exchanger 200 and reducing the equipment operating cost.

[0060] Furthermore, the baffle 310 includes an upper part 311 and a lower part 312. The lower edge of the upper part 311 and the upper edge of the lower part 312 are connected as one piece, so that the baffle 310 forms an angle with the opening facing the side where the thin-walled heat exchange titanium tube 250 is located.

[0061] The baffle 310 is angled with its opening facing the side where the thin-walled heat exchange titanium tube 250 is located, that is, it is not a flat plate. At least one of its upper half 311 and lower half 312 is inclined plate, which can guide the flue gas flow and minimize the airflow resistance caused by the baffle 310.

[0062] In order to both slow down and block dust particles in the flue gas and minimize airflow resistance, in some embodiments of this application, the upper half 311 and the lower half 312 of the baffle 310 are both inclined plates. The upper half 311 is inclined upward relative to the horizontal plane, and the lower half 312 is inclined downward relative to the horizontal plane, forming an angle of approximately 90°.

[0063] The wall thickness of the thin-walled heat exchange titanium tube 250 is less than 1.5mm, such as 1.2mm or 1mm. The smaller the wall thickness, the higher the thermal conductivity.

[0064] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, a first annular groove 261 is formed on the wall of each of the multiple tube holes 260 of the first tube sheet 230, and a first annular protrusion 251 that expands and connects with the first annular groove 261 is formed on the first end of the thin-walled heat exchange titanium tube 250. Similarly, a second annular groove is formed on the wall of each of the multiple tube holes of the second tube sheet 240, and a second annular protrusion that expands and connects with the second annular groove is formed on the second end of the thin-walled heat exchange titanium tube 250.

[0065] Taking the expansion joint between the first end of the thin-walled heat exchange titanium tube 250 and the first tube sheet 230 as an example, during the expansion joint, the first end of the thin-walled heat exchange titanium tube 250 is inserted into the tube hole 260 of the first tube sheet 230, and the part of the first end of the thin-walled heat exchange titanium tube 250 corresponding to the first annular groove 261 is slightly expanded, so that the first end of the thin-walled heat exchange titanium tube 250 forms a first annular protrusion 251 embedded in the first annular groove 261; after completing this part of the expansion joint, the other part of the first end of the thin-walled heat exchange titanium tube 250 is then expanded to fit the inner wall of the tube hole 260 of the first tube sheet 230.

[0066] Similarly, the second end of the thin-walled heat exchange titanium tube 250 is expanded to connect with the second tube sheet 240.

[0067] This expansion joint structure increases the sealing contact area due to the cooperation between the annular protrusion and the annular groove, thereby improving the sealing effect and reducing the risk of leakage. At the same time, it can also improve the expansion joint connection strength between the thin-walled heat exchange titanium tube 250 and the first tube sheet 230 and the second tube sheet 240.

[0068] In some embodiments of this application, the baffle 310 and the thin-walled heat exchange titanium tube 250 are aligned, that is, each baffle 310 corresponds to a layer of multiple thin-walled heat exchange titanium tubes 250 located at the same height. The height of the upper edge of each thin-walled heat exchange titanium tube 250 cannot be higher than the height of the upper edge of the upper half 311 of its corresponding baffle 310, and the height of the lower edge of each thin-walled heat exchange titanium tube 250 cannot be lower than the height of the lower edge of the lower half 312 of its corresponding baffle 310.

[0069] Taking a portion of the thin-walled heat exchange titanium tube 250 as an example, its relative position to the corresponding baffle 310 is as follows: Figure 6 As shown, the baffle 310 is aligned with the thin-walled heat exchange titanium tube 250, and the height of the upper edge of the thin-walled heat exchange titanium tube 250 is level with the height of the upper edge of the upper half 311 of the corresponding baffle 310, indicated by dashed line a; the height of the lower edge of the thin-walled heat exchange titanium tube 250 is level with the height of the lower edge of the lower half 312 of the corresponding baffle 310, indicated by dashed line b. This provides sufficient protection for the first one or two rows of thin-walled heat exchange titanium tubes 250 closest to the high-temperature flue gas inlet 110, preventing high-speed dust particles from hitting and damaging the titanium tubes.

[0070] To ensure that each thin-walled heat exchange titanium tube 250 can fully contact the flue gas and improve heat exchange efficiency, multiple thin-walled heat exchange titanium tubes 250 are arranged in multiple first vertical columns and multiple second vertical columns, with the first and second vertical columns staggered. That is, along the flue gas flow direction, the multiple thin-walled heat exchange titanium tubes 250 of the heat exchanger 200 are arranged in a first vertical column, a second vertical column, a first vertical column, a second vertical column, and so on. The thin-walled heat exchange titanium tubes 250 in the first vertical column are staggered from the thin-walled heat exchange titanium tubes 250 in the second vertical column, that is, they are not aligned with each other, so as to avoid the obstruction of the flue gas by adjacent columns of thin-walled heat exchange titanium tubes 250 as much as possible.

[0071] Correspondingly, the tube holes 260 on the first tube sheet 230 and the second tube sheet 240 are also arranged in the manner described above. Figure 7 Taking the first tube sheet 230 as an example, the tube holes 260 on it are also arranged into multiple first vertical columns and multiple second vertical columns, and the first vertical columns and second vertical columns are arranged alternately, that is, arranged in the order of one column of first vertical column, one column of second vertical column, one column of first vertical column, one column of second vertical column, ..., and so on; the tube holes 260 in the first vertical column are staggered from the tube holes 260 in the second vertical column, so as to correspond one-to-one with each thin-walled heat exchange titanium tube 250.

[0072] Correspondingly, the multiple strip-shaped baffles 310, i.e., all the baffles 310 of the baffle assembly 300, are arranged in two rows along the axial direction of the high-temperature flue gas inlet 110, with each row including multiple baffles 310 spaced vertically. The outer row (i.e., Figure 6 The baffles 310 in the left column of the middle column are aligned one-to-one with the thin-walled heat exchange titanium tubes 250 in the first vertical column, and the inner column (i.e. Figure 6 Each baffle 310 in the right column of the first vertical column is aligned with each thin-walled heat exchange titanium tube 250 in the second vertical column. That is, each baffle 310 in the outer column and each baffle 310 in the inner column are staggered in height, so as to protect each thin-walled heat exchange titanium tube 250 in the first vertical column and the second vertical column from dust particles.

[0073] To further improve the heat exchange effect and thus the efficiency of flue gas waste heat recovery, the number of heat exchangers 200 is preferably multiple, such as... Figure 1 , Figure 2 and Figure 4As shown, multiple heat exchangers 200 are arranged at intervals along the axial direction of the flue gas duct 100. Each heat exchanger 200 has the same structure, and thin-walled titanium heat exchange tubes 250 pass through the flue gas duct 100 in a direction perpendicular to the axial direction of the flue gas duct 100. The first water tanks 210 of all heat exchangers 200 are located on the same side, and the second water tanks 220 of all heat exchangers 200 are located on the opposite side. In two adjacent first water tanks 210, the cooling water outlet 212 of one first water tank 210 is connected to the cooling water inlet of the other first water tank 210 through a cooling water pipe 270. Water inlet 211 connects the first water tank 210 and second water tank 220 of multiple heat exchangers 200 in series. Among all the first water tanks 210, the cooling water inlet 211 on the first first water tank 210 serves as the initial inlet of cooling water, and the cooling water outlet 212 on the last first water tank 210 serves as the final outlet of cooling water. Cooling water enters from the cooling water inlet 211 on the first first water tank 210, flows through each heat exchanger 200 in sequence to exchange heat with the high-temperature flue gas, and then flows out from the cooling water outlet 212 of the last first water tank 210.

[0074] To improve heat exchange efficiency, the heat exchanger 200 containing the first water tank 210 is located away from the high-temperature flue gas inlet 110, while the heat exchanger 200 containing the last water tank 210 is closest to the high-temperature flue gas inlet 110, forming a countercurrent flow of flue gas and cooling water. Figure 2 As shown, the flue gas flows from left to right, while the cooling water flows from right to left, which helps to improve heat exchange efficiency and thus improve the waste heat recovery effect of the flue gas.

[0075] Furthermore, such as Figure 8 As shown, the internal space of the first water tank 210 is enclosed by the first tube plate 230 and the first water tank cover plate 213 located outside the first tube plate 230. A plurality of first partitions 214 are provided between the first tube plate 230 and the first water tank cover plate 213 at left and right intervals to divide the internal space of the first water tank 210 into a plurality of regions arranged in a left and right manner. Correspondingly, the internal space of the second water tank 220 is enclosed by the second tube plate 240 and the second water tank cover plate 221 located outside the second tube plate 240. A plurality of second partitions 222 are provided between the second tube plate 240 and the second water tank cover plate 221 at left and right intervals to divide the internal space of the second water tank 220 into a plurality of regions arranged in a left and right manner. The first partitions 214 and the second partitions 222 are staggered.

[0076] This allows the cooling water to form an S-shaped flow path between the first water tank 210, the thin-walled heat exchange titanium tube 250, and the second water tank 220, with the water flow direction as follows: Figure 8 As shown by the middle arrow, cooling water can flow through each thin-walled heat exchange titanium tube 250, ensuring that the thin-walled heat exchange titanium tube 250 receives sufficient heat exchange and improving the heat exchange effect.

[0077] The first water tank cover plate 213 and the first tube sheet 230, and the second water tank cover plate 221 and the second tube sheet 240 can be respectively sealed and connected by a number of flange connection holes and screws arranged along the circumferential edge.

[0078] The heat exchanger 200 has a roughly rectangular outer contour, and its four corners are prone to forming dead zones. Due to the low flue gas velocity, dust in the flue gas easily accumulates on the ends of the thin-walled titanium heat exchange tubes 250 at the four corners of the heat exchanger 200, thus affecting the heat exchange effect. To enable cleaning of the dust accumulation areas on the thin-walled titanium heat exchange tubes 250, in some embodiments of this application, such as... Figures 1 to 4 As shown, the industrial waste heat recovery heat exchange device also includes a self-cleaning pipeline 400, which includes a main spray pipeline 410 and multiple spray branches 420. Correspondingly, the heat exchanger 200 also includes a cover plate 280, which is fixed above the thin-walled heat exchange titanium tube 250. Spray nozzles corresponding to the spray branches 420 are provided at the four corners of the cover plate 280, and the spray nozzles are connected to the water outlets of the spray branches 420.

[0079] High-pressure water is introduced into the main spray line 410, and then the ends of the thin-walled heat exchange titanium tubes 250 are intermittently sprayed and cleaned through the corresponding spray nozzles of each spray branch 420, so as to wash away the dust accumulated on the ends of the thin-walled heat exchange titanium tubes 250 and ensure the heat exchange effect.

[0080] The cover plate 280 of the heat exchanger 200 can be fastened to the first tube sheet 230 and the second tube sheet 240 with screws to form the frame structure of the heat exchanger 200 and enhance the structural strength.

[0081] When high-temperature flue gas (approximately 250°C) enters the flue gas duct 100 and comes into contact with the outer wall of the thin-walled heat exchange titanium tube 250, which is flowing with cooling water (approximately 20°C), a large amount of acid vapor rapidly condenses and dews on the heated surface (vapor to water), and latent heat is recovered. The moisture in the flue gas is essentially removed, and the emitted flue gas exhibits no "white plume" phenomenon. Simultaneously, fine particulate matter in the flue gas dissolves with the condensed water and is discharged along with it.

[0082] To collect the acid-corrosive wastewater generated by acid vapor condensation for subsequent treatment, in some embodiments of this application, the industrial waste heat recovery heat exchange device further includes a corrosive wastewater discharge pipeline 500. For example... Figure 1 and Figure 2 As shown, the corrosive wastewater discharge pipeline 500 includes a main discharge pipeline 510 and a collection component 520. The collection component 520 is located below the heat exchanger 200 and is used to collect corrosive wastewater condensed and dripping from the outer wall of the thin-walled heat exchange titanium tube 250. The collection component 520 is connected to the main discharge pipeline 510 through a pipeline for unified discharge and centralized treatment.

[0083] The collection component 520 is funnel-shaped and is set one-to-one with each heat exchanger 200. Multiple collection components 520 are connected to the main drain pipe 510. The collection component 520 can be fixed to the first tube sheet 230 and the second tube sheet 240 by screw fastening.

[0084] In some embodiments of this application, the flue gas duct 100 is connected to a bypass pipe 600, the two ends of which are connected between the high-temperature flue gas inlet 110 and the low-temperature flue gas outlet 120, and are connected in parallel with the flue gas duct 100 in the section where the heat exchanger 200 is located, such as... Figure 1 As shown. When the heat exchanger 200 needs to be disassembled, replaced, or repaired, the flue gas duct 100 in its section may not be able to function properly. In this case, the flue gas generated by industrial production can be discharged through the bypass pipe 600 so as not to interfere with normal production.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An industrial waste heat recovery heat exchange device, characterized in that, include: The flue gas duct has a high-temperature flue gas inlet at one end and a low-temperature flue gas outlet at the other end. A heat exchanger includes a first water tank, a second water tank, a first tube sheet, a second tube sheet, and multiple thin-walled titanium heat exchange tubes; the multiple thin-walled titanium heat exchange tubes pass through the flue gas duct in a direction perpendicular to the axial direction of the flue gas duct; the first end of each thin-walled titanium heat exchange tube is expanded and connected to the first tube sheet and communicates with the first water tank, and the second end of each thin-walled titanium heat exchange tube is expanded and connected to the second tube sheet and communicates with the second water tank; the first water tank is provided with a cooling water inlet and a cooling water outlet; The baffle assembly, located at the high-temperature flue gas inlet, includes multiple strip-shaped baffles spaced vertically, with the baffles corresponding to the thin-walled heat exchange titanium tubes.

2. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The wall thickness of the thin-walled heat exchange titanium tube is less than 1.5 mm.

3. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The first tube sheet has a first annular groove formed on the wall of each of the multiple tube holes, and the first end of the thin-walled heat exchange titanium tube has a first annular protrusion that expands to connect with the first annular groove; the second tube sheet has a second annular groove formed on the wall of each of the multiple tube holes, and the second end of the thin-walled heat exchange titanium tube has a second annular protrusion that expands to connect with the second annular groove.

4. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The baffle includes an upper part and a lower part. The lower edge of the upper part and the upper edge of the lower part are connected as one piece, so that the baffle forms an angle with the opening facing the side where the thin-walled heat exchange titanium tube is located.

5. The industrial waste heat recovery heat exchange device according to claim 4, characterized in that, The baffles and the thin-walled heat exchange titanium tubes are aligned, and the height of the upper edge of each thin-walled heat exchange titanium tube cannot be higher than the height of the upper edge of the upper half of the corresponding baffle, and the height of the lower edge of each thin-walled heat exchange titanium tube cannot be lower than the height of the lower edge of the lower half of the corresponding baffle.

6. The industrial waste heat recovery heat exchange device according to claim 5, characterized in that, The multiple thin-walled heat exchange titanium tubes are arranged in multiple first vertical columns and multiple second vertical columns, with the first and second vertical columns staggered. The thin-walled heat exchange titanium tubes in the first vertical column are staggered from the thin-walled heat exchange titanium tubes in the second vertical column. Correspondingly, the multiple strip-shaped baffles are arranged in two rows along the axial direction of the high-temperature flue gas inlet. Each row includes multiple baffles spaced vertically. The baffles in the outer row are aligned with the thin-walled heat exchange titanium tubes in the first vertical column, and the baffles in the inner row are aligned with the thin-walled heat exchange titanium tubes in the second vertical column.

7. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The industrial waste heat recovery heat exchange device also includes: Self-cleaning piping, which includes a main spray line and multiple spray branches; The heat exchanger also includes a cover plate, which is fixed above the thin-walled heat exchange titanium tube. Spray nozzles corresponding to the spray branch are respectively provided at the four corners of the cover plate, and the spray nozzles are connected to the water outlets of the spray branch.

8. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The industrial waste heat recovery heat exchange device also includes: A corrosive wastewater discharge pipeline includes a main discharge pipeline and a collection component. The collection component is located below the heat exchanger and is used to collect condensed and dripping corrosive wastewater. The collection component is connected to the main discharge pipeline via a pipeline.

9. The industrial waste heat recovery heat exchange device according to claim 1, characterized in that, The heat exchangers are multiple and arranged at intervals along the axial direction of the flue gas duct; the first water tanks of all the heat exchangers are located on the same side, and the second water tanks of all the heat exchangers are located on the opposite side; in two adjacent first water tanks, the cooling water outlet of one first water tank is connected to the cooling water inlet of the other first water tank through a pipeline.

10. The industrial waste heat recovery heat exchange device according to claim 9, characterized in that, The internal space of the first water tank is enclosed by the first tube sheet and the first water tank cover plate located outside the first tube sheet. A plurality of first partition plates are provided between the first tube sheet and the first water tank cover plate, which are spaced apart from each other to divide the internal space of the first water tank into a plurality of areas arranged from left to right. The internal space of the second water tank is enclosed by the second tube sheet and the second water tank cover plate located outside the second tube sheet. A plurality of second partitions are provided between the second tube sheet and the second water tank cover plate, which are spaced apart from each other to divide the internal space of the second water tank into a plurality of areas arranged from left to right. The first partition and the second partition are staggered.

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