Self-deashing flue gas waste heat exchange device and method

Abstract

The invention provides a self-deashing flue gas waste heat exchange device and method.The device is characterized in that a first flow guide part is arranged at the position, close to a hot fluid inlet, in a shell, a second flow guide part is arranged at the position, close to a hot fluid outlet, in the shell, the first flow guide part comprises first blades which are evenly arranged, and the second flow guide part comprises second blades which are evenly arranged; all the first blades are connected together through a first connecting rod, a first rotating shaft is connected to the middle of the first connecting rod, and the first rotating shaft is connected with a first rotating motor; the second flow guide part comprises second blades which are uniformly arranged, all the second blades are connected together through a second connecting rod, a second rotating shaft is connected to the middle of the second connecting rod, and the second rotating shaft is connected with a second rotating motor; and the first rotating motor and the second rotating motor are both connected with a controller. The flow direction of hot fluid can be changed, accumulated dust formed on the heat exchange tube assembly is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat and waste energy recovery and efficient utilization, and more specifically, to a self-cleaning flue gas waste heat heat exchange device and method. Background Art

[0002] With the growing energy crisis and increasing environmental protection requirements, waste heat recovery technology has emerged as a new approach to energy conservation and emission reduction. Waste heat refers to underutilized heat generated during industrial production processes. By recovering this waste heat, it can be converted into useful energy, achieving efficient energy utilization and reducing energy consumption.

[0003] Flue gas waste heat accounts for a significant portion of recoverable waste heat resources. Effectively utilizing this heat can significantly reduce primary energy consumption and improve energy efficiency. However, since industrial flue gas waste heat often contains a certain concentration of fly ash particles, this can cause ash accumulation on the heat exchanger tube bundles when the flue gas enters the heat exchanger. Ash accumulation on the heating surfaces not only increases the thermal resistance of the heating surfaces, reduces the convective heat transfer coefficient, and decreases heat transfer capacity, but also affects the stable operation of the system. Blast furnace gas (BFG) is a byproduct of coke combustion and iron ore reduction reactions in the blast furnace ironmaking process. Its main components are CO, CO₂, H₂, and N₂, making it a usable low-calorific value combustible gas. Currently, in blast furnace gas-fired power generation projects, boiler flue gas passes through a gas heater, undergoes desulfurization and dust removal, and is then discharged through an induced draft fan into the chimney. The exhaust temperature is between 130°C and 140°C, and this heat accounts for approximately 3.6% of the total heat in the flue gas process.

[0004] Heat pipe heat exchangers are highly efficient heat transfer equipment, widely used in waste heat recovery, electronic cooling, aerospace and other fields. However, despite its many advantages, existing heat pipe heat exchanger technology still has some disadvantages and limitations. Among them, the main disadvantages of low-temperature flue gas heat pipe heat exchangers are dust accumulation and corrosion, which will reduce heat transfer efficiency and service life. In order to solve the problem of dust accumulation, it is usually necessary to add equipment. For example, steam soot blowers use high-pressure steam jets to impact the heat exchange surface to remove dust accumulation, but the energy consumption is high and may cause pipe wall corrosion or thermal stress problems; sonic soot blowers use the vibration energy of sound waves or infrasound waves to loosen the dust and fall off the surface, but the effect on sticky dust or hard deposits is limited. In addition, there are gas pulse soot blowers, compressed air soot blowers, etc., which will increase costs. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a self-cleaning flue gas waste heat exchange device and method, which has a guide member that can change the flow direction of the hot fluid to avoid the flue gas flow direction being always fixed, reduce the formation of dust accumulation on the heat exchange tube assembly, and improve the heat exchange efficiency.

[0006] The present invention provides a self-cleaning flue gas waste heat exchange device, comprising a shell and a heat exchange tube assembly arranged in the shell, wherein the hot fluid inlet and the hot fluid outlet of the shell are respectively located at the left and right ends of the shell.

[0007] A first flow guide is provided in the shell near the hot fluid inlet, and a second flow guide is provided in the shell near the hot fluid outlet, wherein:

[0008] The first flow guide comprises vertical first blades uniformly arranged along the side of the heat exchange tube assembly facing the hot fluid inlet, the edges of all the first blades facing the hot fluid inlet being connected together by a first connecting rod, a vertical first rotating shaft being connected to the middle of the first connecting rod, the first rotating shaft passing through the housing and being connected to a first rotating motor;

[0009] The second flow guide comprises vertical second blades uniformly arranged along the side of the heat exchange tube assembly facing the hot fluid outlet, the edges of all the second blades facing the hot fluid outlet being connected together by a second connecting rod, a vertical second rotating shaft is connected to the middle of the second connecting rod, the second rotating shaft passes through the housing and is connected to the second rotating motor;

[0010] The first rotating motor and the second rotating motor are both connected to a controller.

[0011] The first blade and the second blade have the same shape and size; the first blade includes a trapezoidal plate and a rectangular plate connected to the long bottom side of the trapezoidal plate, the length of the rectangular plate is equal to the long bottom side of the trapezoidal plate, the rectangular plate and the trapezoidal plate are on the same plane, and the short bottom side of the trapezoidal plate is vertically connected to the first connecting rod.

[0012] The length of the rectangular plate is adapted to the inner height of the shell.

[0013] The distance between adjacent first blades is the same as the distance between adjacent second blades.

[0014] The number of the first connecting rods and the number of the second connecting rods are both at least two.

[0015] The lengths of the first connecting rod and the second connecting rod are both smaller than the width of the housing.

[0016] Both ends of the first rotating shaft pass through the housing and are rotatably connected to the housing via a first sealing ring; both ends of the second rotating shaft pass through the housing and are rotatably connected to the housing via a second sealing ring.

[0017] The first sealing ring and the second sealing ring are both sealed bearings.

[0018] The lower ends of the first rotating shaft and the second rotating shaft are connected to the rotating shafts of the first rotating motor and the second rotating motor respectively.

[0019] Another aspect of the present invention provides a method for exchanging waste heat from self-cleaning flue gas. The self-cleaning flue gas waste heat exchange device performs heat exchange on waste heat from flue gas, comprising the following steps:

[0020] S1: Design at least three flow diversion forms according to the arrangement of the heat exchange tube assembly;

[0021] S2: according to each flow guiding form, setting the controller to control the rotation direction and speed of the first rotating motor and the second rotating motor so that the first flow guiding member and the second flow guiding member sequentially form each flow guiding form;

[0022] S3: The flue gas entering the shell from the hot fluid inlet is guided to the hot fluid outlet by the guide form formed by the first guide member and the second guide member, and is discharged from the shell.

[0023] As can be seen from the above description, the self-cleaning flue gas waste heat exchange device and method provided by the present invention include a first flow guide disposed within the housing near the hot fluid inlet and a second flow guide disposed within the housing near the hot fluid outlet. The blades of both the first and second flow guides rotate to change the direction and path of the fluid flow within the housing, preventing flue gas from being blown toward fixed locations on the heat exchange tubes for extended periods of time and reducing dust accumulation on the heat exchange tube assemblies. Multi-directional blowing can also remove already adhered dust. This invention automatically reduces and cleans dust accumulation on the heat exchange tubes, while simultaneously improving heat exchange efficiency, reducing low-temperature corrosion, and extending equipment life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the accompanying drawings:

[0025] Figure 1 This is a schematic structural diagram of a self-cleaning flue gas waste heat exchange device according to Example 1 of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the first flow guide according to embodiment 1 of the present invention;

[0027] Figure 3 for Figure 1 AA section view;

[0028] Figure 4 Schematic diagram of the flow diversion of the self-cleaning flue gas waste heat exchange device according to Example 2 of the present invention;

[0029] Figure 5Schematic diagram of the flow diversion of the self-cleaning flue gas waste heat exchange device according to Example 3 of the present invention;

[0030] Figure 6 Flowchart of a self-cleaning flue gas waste heat exchange method according to Example 4 of the present invention;

[0031] Among them, 1-first flow guide, 11-first blade, 111-trapezoidal plate, 112-rectangular plate, 12-first connecting rod, 13-first rotating shaft, 14-first rotating motor, 2-second flow guide, 21-second blade, 22-second connecting rod, 23-second rotating shaft, 24-second rotating motor, 3-first sealing ring, 4-second sealing ring, 5-heat exchange tube assembly, 6-shell, 7-hot fluid inlet, 8-hot fluid outlet;

[0032] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0033] In the following description, for illustrative purposes, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.

[0034] The present invention is susceptible to various modifications and embodiments, and specific embodiments are illustrated and described with reference to the accompanying drawings. However, the present invention is not limited to these specific embodiments and encompasses all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention, and should be understood to be encompassed thereby.

[0035] Ordinal terms such as first and second may be used to describe various components, but the components are not limited to these terms. These terms are used only to distinguish one component from another. For example, the second component may be named the first component, and similarly, the first component may be named the second component without departing from the scope of the claims of the present invention. Terms and / or terms include a combination of multiple related items or a specific item from multiple related items.

[0036] It should be understood that when a component is referred to as being "connected" or "in contact with" another component, this includes not only being directly connected or in contact with the other component, but also being understood to include being interposed with other components. Conversely, when a component is referred to as being "directly connected" or "directly in contact with" another component, it should be understood that there are no interposed components.

[0037] In the description of the embodiments, when a component is described as being formed "on or under" another component, "on or under" includes both components being in direct contact with each other or at least one other component being disposed between the two components. Furthermore, when "on" or "under" is used as a reference, it refers not only to the upper direction but also to the lower direction.

[0038] The terms used in this application are only used to illustrate specific embodiments and are not intended to limit the present invention. Unless the context clearly dictates otherwise, expressions in the singular include expressions in the plural. In this application, it should be understood that terms such as "including" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, parts, or combinations thereof described in the specification, and do not preclude the presence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, parts, or combinations thereof.

[0039] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meanings as those generally understood by those skilled in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meanings as those in the context of the relevant technology and should not be interpreted as having ideal or overly formal meanings unless they are clearly defined in this application.

[0040] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] like Figure 1-Figure 3 As shown in the figure, the self-cleaning flue gas waste heat heat exchange device proposed in this embodiment can be used to recover and utilize the waste heat of industrial flue gas, and can also be used to recover and utilize the waste heat of other gases mixed with particulate matter.

[0043] The existing flue gas waste heat heat exchange device includes a shell 6 and a heat exchange tube assembly 5 arranged in the shell 6. The hot fluid inlet 7 and the hot fluid outlet 8 of the shell 6 are respectively located at the left and right ends of the shell 6. During the normal heat exchange process, when the airflow passes through the heat exchange tube assembly 5, a vortex or low-speed zone will be formed behind the tube wall, especially on the leeward side of the tube, and particulate matter in the airflow is easily deposited and accumulated. Ash accumulation will have a negative impact on the performance, operating efficiency and life of the heat exchange tube. Ash accumulation forms an insulating layer on the surface of the heat exchange tube, which increases thermal resistance and reduces heat transfer efficiency. Due to the reduction in heat transfer efficiency, the overall heat exchange capacity of the heat exchange tube assembly 5 decreases, resulting in increased system energy consumption. At the same time, certain components in the ash accumulation (such as sulfates and chlorides) may absorb moisture to form corrosive media, causing corrosion on the surface of the heat exchange tube and shortening the service life of the equipment.

[0044] This self-cleaning flue gas waste heat exchanger improves upon existing flue gas waste heat exchangers by adding a first flow guide 1 and a second flow guide 2 to the windward and leeward sides of the heat exchange tube assembly 5, respectively. The flow direction of the first and second flow guides 1 and 2 can be adjusted based on dust accumulation or on a regular basis to alter the direction and velocity of the flue gas. This change in flow direction prevents flue gas particles from always drifting to fixed locations on the heat exchange tubes. The change in flow velocity increases the flue gas's turbulence intensity, improving the suspension of particles and preventing them from settling. The high-speed flow stage flushes away deposited dust, removing some of the accumulated dust.

[0045] Existing flue gas waste heat exchange devices also have an upper shell above the housing 6. The upper portion of each heat exchange tube in the heat exchange tube assembly 5 penetrates the upper shell, transferring the heat absorbed from the waste heat into the fluid within the upper shell, thereby recovering the waste heat from the flue gas. This self-cleaning flue gas waste heat exchange device eliminates the need for an additional soot blower and automatically eliminates dust accumulation on the heat exchange tubes, keeping them clean. This improves the efficiency of flue gas waste heat recovery and protects the equipment.

[0046] A first flow guide 1 is provided in the shell 6 near the hot fluid inlet 7, and a second flow guide 2 is provided in the shell 6 near the hot fluid outlet 8. The first flow guide 1 and the second flow guide 2 are respectively at the inlet and outlet of the flue gas flow, and cooperate with each other to change the flow route and speed of the flue gas.

[0047] In order to effectively guide the smoke, the first guide member 1 and the second guide member 2 may have the same structure and be arranged opposite to each other.

[0048] The first flow guide 1 may include vertical first blades 11 evenly arranged along the side of the heat exchange tube assembly 5 facing the hot fluid inlet 7, and the edges of all the first blades 11 facing the hot fluid inlet 7 are connected together by a first connecting rod 12. A vertical first rotating shaft 13 is connected to the middle of the first connecting rod 12, and the first rotating shaft 13 passes through the shell 6 and is connected to the first rotating motor 14.

[0049] The heat exchange tube assembly 5 includes several evenly spaced vertical pipes that nearly cover the entire width of the shell 6. The first blades 11 of the first flow guide 1 are evenly spaced along the width of the shell 6. The spacing can be determined based on specific conditions such as the smoke inlet velocity and pipe density. The height of the first blades 11 is slightly smaller than that of the shell 6, directing the flow throughout the heat exchange tube assembly 5. All first blades 11 are connected as a single unit, facing the heat exchange tube assembly 5. Upon entering, the smoke is directed along the first blades 11.

[0050] In order to adjust the flow direction of the first blades 11, the first flow guide 1 is driven to rotate by the first rotating motor 14. The rotating shaft of the first rotating motor 14 is connected to the first connecting rod 12 in the middle of the first flow guide 1, so that the first flow guide 1 rotates around the vertical center line. The first blades 11 are perpendicular to the first connecting rod 12, and a plurality of first blades 11 form side-by-side blades along the first connecting rod 12. When the first rotating motor 14 returns to its original position, the first connecting rod 12 is along the width direction of the shell 6, and the first blades 11 are all facing the heat exchange tube assembly 5, and the incoming flue gas is diverted to flow vertically toward the heat exchange tube assembly 5; when the first rotating motor 14 is rotated, the angle between the first connecting rod 12 and the width direction of the shell 6 can be adjusted, and the first blades 11 are all tilted toward the heat exchange tube assembly 5, and the incoming flue gas is diverted to flow obliquely toward the heat exchange tube assembly 5.

[0051] The first rotating motor 14 is located outside the housing 6 and is easy to control.

[0052] The second flow guide 2 may include vertical second blades 21 evenly arranged along the side of the heat exchange tube assembly 5 facing the hot fluid outlet 8, and the edges of all the second blades 21 facing the hot fluid outlet 8 are connected together by a second connecting rod 22. A vertical second rotating shaft 23 is connected to the middle of the second connecting rod 22. The second rotating shaft 23 passes through the shell 6 and is connected to the second rotating motor 24.

[0053] The second blades 21 of the second flow guide 2 are arranged at equal intervals along the width of the housing 6. The spacing can be the same as the spacing between the first blades 11. The height of the second blades 21 is slightly smaller than the height of the housing 6. The second blades 21 and the first blades 11 cooperate to guide the flue gas in different flow directions. All the second blades 21 are connected as a whole. The second blades 21 face the heat exchange tube assembly 5. When the flue gas flows out of the housing 6 along the second blades 21,

[0054] In order to adjust the diversion direction of the second blades 21, the second flow guide 2 is driven to rotate by a second rotating motor 24. The rotating shaft of the second rotating motor 24 is connected to the second connecting rod 22 in the middle of the second flow guide 2, so that the second flow guide 2 rotates around the vertical centerline. The second blades 21 are perpendicular to the second connecting rod 22, and a plurality of second blades 21 form side-by-side blades along the second connecting rod 22. When the second rotating motor 24 returns to its original position, the second connecting rod 22 is along the width direction of the shell 6, and the second blades 21 are all facing the heat exchange tube assembly 5, and the flue gas flows out perpendicular to the heat exchange tube assembly 5; when the second rotating motor 24 is rotated, the angle between the second connecting rod 22 and the width direction of the shell 6 can be adjusted, and the second blades 21 are all tilted toward the heat exchange tube assembly 5, and the flue gas is diverted to flow out obliquely.

[0055] The second rotating motor 24 is located outside the housing 6 for easy control.

[0056] The first rotary motor 14 and the second rotary motor 24 are both connected to a controller. The controller can be programmed to control the rotation patterns of the first rotary motor 14 and the second rotary motor 24, respectively, to control the direction of the blades of the first flow guide 1 and the second flow guide 2, thereby achieving the diversion of the flue gas in various directions and flow rates within the housing 6.

[0057] In a specific embodiment of the present invention, the first blades 11 and the second blades 21 have the same shape and size to ensure effective coordination between the first flow guide 1 and the second flow guide 2. The first blades 11 and the second blades 21 of the same shape can better coordinate with each other to guide the flow, achieving the desired flow direction and flow rate.

[0058] In a specific embodiment of the present invention, to facilitate flow diversion, the first blade 11 comprises an isosceles trapezoidal plate 111 and a rectangular plate 112 connected to the long base of the trapezoidal plate 111. The rectangular plate 112 is equal in length to the long base of the trapezoidal plate 111 and lies coplanar with the trapezoidal plate 111. The short base of the trapezoidal plate 111 is perpendicularly connected to the first connecting rod 12, and the short base of the trapezoidal plate 111 is slightly shorter than the long base. The substantially rectangular blade facilitates the diversion of flue gas from the housing 6. Both the first blade 11 and the second blade 21 are constructed of heat-resistant and corrosion-resistant sheet materials.

[0059] In a specific embodiment of the present invention, to fully guide the flue gas, the length of the rectangular plate 112 is adapted to the inner height of the shell 6. The length of the rectangular plate 112 is almost the same as the inner height of the shell 6 and is not less than the height of the heat exchange tube assembly 5. This effectively guides the flue gas that has diffused into the shell 6 and prevents the flue gas from being deposited at any position in the heat exchange tube assembly 5.

[0060] In a specific embodiment of the present invention, in order to guide the flow more smoothly, the spacing between adjacent first blades 11 is the same as the spacing between adjacent second blades 21, and the arrangement of all first blades 11 is the same as the arrangement of all second blades 21.

[0061] like Figure 1 As shown, when the first rotating motor 14 and the second rotating motor 24 are in their return positions, all the first blades 11 and all the second blades 21 are symmetrically arranged. In this state, the flue gas has low resistance and flows in a straight line, forming a vortex and a low-speed zone directly behind the heat exchange tube assembly 5. This state is one of the diversion modes, and several other diversion modes operate alternately with this diversion mode to prevent particulate matter in the flue gas from adhering to the heat exchange tube assembly 5.

[0062] In a specific embodiment of the present invention, there are at least two first connecting rods 12 and at least two second connecting rods 22. A first connecting rod 12 may be connected to the upper and lower ends of the back edges of all first blades 11, and a first connecting rod 12 may be connected to the upper and lower ends of the back edges of all second blades 21. The first connecting rods 12 and the second connecting rods 22 can securely connect all first blades 11 and second blades 21.

[0063] In a specific embodiment of the present invention, to ensure smooth rotation of the first and second flow guides 1 and 2 within the housing 6, the lengths of the first and second connecting rods 12 and 22 are both less than the width of the housing 6. The lengths of the first and second connecting rods 12 and 22 are sufficient to allow for free rotation in the width direction of the housing 6 while also allowing for connection of all blades.

[0064] In one embodiment of the present invention, to ensure stable vertical rotation of the shafts, both ends of the first shaft 13 extend beyond the housing 6 and are rotatably connected to the housing 6 via a first sealing ring 3. Both ends of the second shaft 23 extend beyond the housing 6 and are rotatably connected to the housing 6 via a second sealing ring 4. Both ends of the first shaft 13 and the second shaft 23 are restrained by the housing 6, enabling stable vertical rotation. The first and second sealing rings 3 and 4 seal the connection between the first and second shafts 13 and 23 and the housing 6, preventing smoke leakage.

[0065] In a specific embodiment of the present invention, both the first sealing ring 3 and the second sealing ring 4 can be sealed bearings. Sealed bearings are bearings with sealing rings or seals on both the inside and outside of the bearing. They can prevent smoke leakage and external impurities from entering, while ensuring stable and smooth rotation of the first rotating shaft 13 / the second rotating shaft 23.

[0066] In one embodiment of the present invention, to facilitate the rotational control of first air guide 1 and second air guide 2, the lower ends of first rotating shaft 13 and second rotating shaft 23 are connected to the rotating shafts of first rotating motor 14 and second rotating motor 24, respectively. Both first rotating motor 14 and second rotating motor 24 are located outside and below housing 6, making control easier.

[0067] Example 2

[0068] Figure 4 Schematic diagram of the flow diversion of the self-cleaning flue gas waste heat exchange device according to Example 2 of the present invention.

[0069] like Figure 4 As shown, the self-cleaning flue gas waste heat exchange device provided in this embodiment, based on Example 1, controls the rotation of the first rotating motor 14 and the second rotating motor 24 respectively, and adjusts the blade direction of the first guide member 1 and the second guide member 2 to realize the guide form of this embodiment.

[0070] In this embodiment, the first and second rotary motors 14 and 24 are controlled to rotate so that the first connecting rod 12 of the first air guide 1 and the width of the housing 6, and the second connecting rod 22 of the second air guide 2 form an acute angle with the width of the housing 6, and the first and second connecting rods 12 and 22 are parallel. This flow diversion pattern creates a vortex and a low-velocity zone at the lower right corner of the heat exchange tube assembly 5, allowing the flue gas to flow in an S-shaped path, preventing ash accumulation and ensuring sufficient heat exchange.

[0071] Example 3

[0072] Figure 5 Schematic diagram of the flow diversion of the self-cleaning flue gas waste heat exchange device according to Example 3 of the present invention.

[0073] like Figure 5 As shown, the self-cleaning flue gas waste heat exchange device provided in this embodiment, based on Example 1, controls the rotation of the first rotating motor 14 and the second rotating motor 24 respectively, and adjusts the blade direction of the first guide member 1 and the second guide member 2 to realize the guide form of this embodiment.

[0074] In this embodiment, the first rotary motor 14 and the second rotary motor 24 can be controlled to rotate so that the first connecting rod 12 of the first flow guide 1 and the width direction of the housing 6, and the second connecting rod 22 of the second flow guide 2 form an acute angle with the width direction of the housing 6, and the first connecting rod 12 and the second connecting rod 22 are symmetrical. This flow guidance increases the flow velocity above the heat exchange tube assembly 5, and the flue gas flows in an arc-shaped path.

[0075] The alternating changes in flue gas flow rate will make it difficult for particulate matter to stably adhere to the surface of the heat exchange tube, reducing dust accumulation to a certain extent. The high-speed flow stage can flush the deposited dust and remove some of the accumulated dust.

[0076] The controller can also be used to rotate the first rotating motor 14 and the second rotating motor 24 to other angles respectively, so that the first guide member 1 and the second guide member 2 form different guide forms, and automatically eliminate dust accumulation in the flue gas waste heat exchange device.

[0077] Example 4

[0078] Figure 6 Flowchart of the self-cleaning flue gas waste heat exchange method according to Example 4 of the present invention.

[0079] like Figure 6 As shown, the self-cleaning flue gas waste heat heat exchange method provided in this embodiment adopts the self-cleaning flue gas waste heat heat exchange device described in Example 1 to exchange the flue gas waste heat, including the following steps:

[0080] S1: Design at least three flow diversion forms according to the arrangement of the heat exchange tube assembly 5.

[0081] If the heat exchange tube assembly 5 is a plurality of heat exchange tubes arranged in rows, the three diversion forms in Examples 1, 2, and 3 can be designed to divert the flue gas.

[0082] S2: According to each diversion form, the controller is set to control the rotation direction and speed of the first rotating motor 14 and the second rotating motor 24, so that the first diversion member 1 and the second diversion member 2 form each diversion form in sequence.

[0083] By setting the control program of the controller, the rotation rules of the first rotating motor 14 and the second rotating motor 24 are controlled respectively to control the direction changes of the blades of the first guide member 1 and the second guide member 2, so as to realize the guidance of the smoke in multiple directions, routes and flow rates in the shell 6.

[0084] S3: The flue gas entering the shell 6 from the hot fluid inlet 7 is guided by the guide form formed by the first guide member 1 and the second guide member 2 to flow through the heat exchange tube assembly 5 to the hot fluid outlet 8 and discharged from the shell 6.

[0085] Because the flow patterns formed by the first and second flow guides 1 and 2 change periodically, the flue gas continuously entering the housing 6 is guided by the different flow patterns formed by the first and second flow guides 1 and 2. The flue gas entering the housing 6 at different times has different flow paths and speeds, which can prevent the formation of dust accumulation on the heat exchange tube assembly 5.

[0086] The self-cleaning flue gas waste heat exchange device and method according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications may be made to the self-cleaning flue gas waste heat exchange device and method described above without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A self-cleaning flue gas waste heat exchange device, comprising a shell and a heat exchange tube assembly arranged in the shell, wherein the hot fluid inlet and the hot fluid outlet of the shell are respectively located at the left and right ends of the shell, characterized in that: A first flow guide is provided in the housing near the hot fluid inlet, and a second flow guide is provided in the housing near the hot fluid outlet, wherein: The first flow guide comprises first blades uniformly and vertically arranged along the side of the heat exchange tube assembly facing the hot fluid inlet, the edges of all the first blades facing the hot fluid inlet being connected together by a first connecting rod, a vertical first rotating shaft being connected to the middle of the first connecting rod, the first rotating shaft passing through the housing and being connected to a first rotating motor; The second flow guide comprises second blades uniformly and vertically arranged along the side of the heat exchange tube assembly facing the hot fluid outlet, the edges of all the second blades facing the hot fluid outlet being connected together by a second connecting rod, a vertical second rotating shaft being connected to the middle of the second connecting rod, the second rotating shaft passing through the housing and being connected to a second rotating motor; The first rotating motor and the second rotating motor are both connected to a controller.

2. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: The first blade and the second blade have the same shape and size; The first blade includes a trapezoidal plate and a rectangular plate connected to the long bottom side of the trapezoidal plate, the length of the rectangular plate is equal to the long bottom side of the trapezoidal plate, the rectangular plate and the trapezoidal plate are on the same plane, and the short bottom side of the trapezoidal plate is vertically connected to the first connecting rod.

3. The self-cleaning flue gas waste heat exchange device according to claim 2, characterized in that: The length of the rectangular plate is adapted to the inner height of the shell.

4. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: The distance between adjacent first blades is the same as the distance between adjacent second blades.

5. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: The number of the first connecting rods and the number of the second connecting rods are both at least two.

6. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: The lengths of the first connecting rod and the second connecting rod are both smaller than the width of the housing.

7. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: Both ends of the first rotating shaft pass through the housing and are rotatably connected to the housing via a first sealing ring; Both ends of the second rotating shaft pass through the housing and are rotatably connected to the housing via a second sealing ring.

8. The self-cleaning flue gas waste heat exchange device according to claim 7, characterized in that: The first sealing ring and the second sealing ring are both sealed bearings.

9. The self-cleaning flue gas waste heat exchange device according to claim 1, characterized in that: The lower ends of the first rotating shaft and the second rotating shaft are connected to the rotating shafts of the first rotating motor and the second rotating motor respectively.

10. A self-cleaning flue gas waste heat heat exchange method, characterized in that: The self-cleaning flue gas waste heat exchange device according to any one of claims 1 to 9 is used to exchange flue gas waste heat, comprising the following steps: S1: Design at least three flow diversion forms according to the arrangement of the heat exchange tube assembly; S2: according to each flow guiding form, setting the controller to control the rotation direction and speed of the first rotating motor and the second rotating motor so that the first flow guiding member and the second flow guiding member sequentially form each flow guiding form; S3: The flue gas entering the shell from the hot fluid inlet is guided by the guide form formed by the first guide member and the second guide member to flow through the heat exchange tube assembly to the hot fluid outlet and discharged from the shell.

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