Combined assembly type flue gas waste heat recovery heat exchanger

Abstract

The embodiment of the present disclosure provides a combined assembled flue gas waste heat recovery heat exchanger, which comprises a heat exchange assembly and a supporting leg connected with the heat exchange assembly and providing support; the heat exchange assembly comprises a lower connecting shell, a filtering treatment shell and a sealing cover which are vertically nested and assembled; the upper end of the lower connecting shell and the filtering treatment shell is provided with a clamping groove, and the lower end of the filtering treatment shell and the lower end of the sealing cover are provided with a clamping buckle boss matched with the clamping groove; wherein the lower connecting shell, the filtering treatment shell and the sealing cover are configured to be buckled through the clamping groove and the clamping buckle boss, and the detachable connection of the clamping groove and the clamping buckle boss is realized through a connecting piece.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of waste heat recovery heat exchangers, specifically relating to a combined and assembled flue gas waste heat recovery heat exchanger. Background Technology

[0002] This application relates to the field of flue gas waste heat recovery and purification technology. The "modular assembly flue gas waste heat recovery heat exchanger" refers to a device whose main body is vertically assembled from a lower connecting shell, a filter shell, and a sealing cover via slots, snap-fit ​​bosses, and bolts. This allows for quick assembly and disassembly, adapting to different installation requirements. "Flue gas waste heat recovery" is achieved through a finned serpentine tube within the shell, forming a circulating heat exchange with the flue gas and transferring heat from the flue gas to the heat exchange medium. The "heat exchanger" is the device that completes heat exchange between the flue gas and the medium through the above structure, simultaneously achieving flue gas purification. The core innovation lies in the combination of the assembly structure with an integrated design for heat exchange and dust removal.

[0003] In industrial boilers, kilns, and other equipment emitting flue gas, traditional flue gas waste heat recovery equipment is mostly an integrated structure, requiring complete disassembly for maintenance, which is cumbersome and time-consuming. Furthermore, the large amount of dust in the flue gas easily adheres to the heat exchange pipes and the inner wall of the shell, reducing the heat exchange contact area and clogging the flow channels, thus lowering waste heat recovery efficiency. Existing equipment also lacks targeted graded dust removal and anti-ash accumulation structures, requiring frequent shutdowns for cleaning, severely impacting production continuity. In addition, the unreasonable layout of heat exchange pipes in traditional equipment results in short flue gas residence times and insufficient waste heat recovery, leading to energy waste.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a combined assembled flue gas waste heat recovery heat exchanger.

[0006] One aspect of the embodiments of this disclosure provides a combined, modular flue gas waste heat recovery heat exchanger, comprising: A heat exchange assembly, and a support leg connected to and providing support to the heat exchange assembly; The heat exchange assembly includes a vertically nested lower connecting shell, a filter shell, and a sealing cover; The lower connecting shell and the upper end of the filter processing shell are both provided with slots, and the lower end of the filter processing shell and the lower end of the sealing cover are both provided with buckle protrusions that are adapted to the slots. The lower connecting shell, the filter processing shell, and the sealing cover are configured to snap together via the slot and the buckle protrusion, and the slot and the buckle protrusion are detachably connected via a connector.

[0007] Optionally, the connector includes bolts; the filter processing shell is provided with at least one inclined plate group, the inclined plate group includes two inclined plates arranged in a cross-shaped inclination and disposed on opposite sides of the inner wall of the filter processing shell, and each inclined plate is provided with an arc-shaped ash drop groove.

[0008] Optionally, the filter housing is provided with two inclined plate groups, each of which is spaced apart along the flue gas flow direction in the filter housing, and together they form a non-linear flue gas detour channel.

[0009] Optionally, a triangular plate is provided on the inner wall of the filter processing shell located between adjacent inclined plates.

[0010] Optionally, the inclined plate has a serpentine tube on the surface facing the bottom of the filter housing, and fins are arranged on the surface of the serpentine tube; the serpentine tubes arranged on each of the inclined plates are connected to each other through a conveying pipe to form a medium flow loop, wherein the inlet end of the medium flow loop is connected to a main water inlet pipe and the outlet end is connected to a main drain pipe.

[0011] Optionally, each of the inclined plates is provided with a plurality of serpentine tubes at intervals, and the plurality of serpentine tubes are connected in series.

[0012] Optionally, the top of the sealing cover is provided with an upper filter screen, the inside of the filter processing shell and at the bottom is provided with a lower filter screen, and a trapezoidal filter screen is also provided on the upper side of the lower filter screen, wherein a drainage groove is provided between the mesh array of the trapezoidal filter screen.

[0013] Optionally, a fluid diversion groove is provided on the lower filter screen, and a square drain pipe extending downward through the lower connecting shell is connected to the open end of the drain groove; wherein, the drain groove is configured to extend from the middle of the trapezoidal filter screen to the edge, and the water outlet end of the drain groove corresponds to the position of the fluid diversion groove.

[0014] Furthermore, it also includes a spray assembly installed inside the heat exchange component, the spray assembly including an F-type diverter pipe, a control valve located at the inlet of the F-type diverter pipe, and an atomizing nozzle connected to the output end of the F-type diverter pipe.

[0015] Optionally, the number of atomizing nozzles is two sets, and the two sets of atomizing nozzles are symmetrically arranged in the inner cavity of the filter processing shell and arranged on both sides of the top of the inner cavity. The spray direction of the two sets of atomizing nozzles is set towards the central area of ​​the filter processing shell.

[0016] The beneficial effects of the embodiments of this disclosure include: In this application, the lower connecting shell, filter treatment shell, and sealing cover are modularly assembled by quick-locking positioning through slots and buckle protrusions, followed by locking with connectors. Compared to the traditional integral structure, disassembly and assembly do not require complete disassembly; simply loosening the connectors allows for segment separation, significantly simplifying maintenance operations, reducing downtime, and improving the convenience of equipment inspection and cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a combined and assembled flue gas waste heat recovery heat exchanger according to an embodiment of the present disclosure. Figure 2 This is a cross-sectional structural schematic diagram of a combined and assembled flue gas waste heat recovery heat exchanger according to an embodiment of the present disclosure. Figure 3 for Figure 2 A magnified schematic diagram of the central part of the structure; Figure 4 This is a schematic diagram of the serpentine tube section of a combined assembled flue gas waste heat recovery heat exchanger according to an embodiment of the present disclosure. Figure 5 This is a schematic diagram of the upper filter section of a combined assembled flue gas waste heat recovery heat exchanger according to an embodiment of the present disclosure.

[0018] In the diagram, 1. Support leg; 2. Heat exchange assembly; 201. Lower connecting shell; 202. Filter processing shell; 203. Inclined plate; 204. Arc-shaped ash trough; 205. Serpentine pipe; 206. Conveying pipe; 207. Sealing cover; 208. Slot; 209. Snap-on boss; 210. Bolt; 211. Fin; 212. Triangular plate; 213. Trapezoidal filter screen; 214. Drainage trough; 215. Square drain pipe; 216. Fluid diversion trough; 217. Main water inlet pipe; 218. Main drain pipe; 219. Upper filter screen; 220. Lower filter screen; 3. Spray assembly; 301. F-type diversion pipe; 302. Atomizing nozzle; 303. Control valve. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0021] In the description of this application, it should also be noted that, unless otherwise expressly 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. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0022] like Figure 1-5 As shown, a modular flue gas waste heat recovery heat exchanger includes a heat exchange component 2 and a support leg 1 connected to and providing support for the heat exchange component 2.

[0023] The heat exchange assembly 2 includes a vertically nested lower connecting shell 201, a filter processing shell 202, and a sealing cover 207.

[0024] The upper ends of the lower connecting shell 201 and the filter processing shell 202 are both provided with slots 208, and the lower ends of the filter processing shell 202 and the sealing cover 207 are both provided with buckle protrusions 209 that are adapted to the slots 208.

[0025] The lower connecting shell 201, the filter treatment shell 202, and the sealing cover 207 are configured to be snapped together by the slot 208 and the buckle protrusion 209, and the slot 208 and the buckle protrusion 209 are detachably connected by a connector.

[0026] In this application, the lower connecting shell 201, the filter treatment shell 202, and the sealing cover 207 are modularly assembled by quick-locking positioning through the slot 208 and the buckle protrusion 209, and then locked by the connector. Compared with the traditional integral structure, disassembly and assembly do not require overall disassembly; the sections can be separated simply by loosening the connector, greatly simplifying maintenance operations, shortening downtime, and improving the convenience of equipment inspection and cleaning.

[0027] In some embodiments, the connector includes bolts 210. The filter housing 202 contains at least one set of inclined plates, each set including two inclined plates 203 arranged at opposite angles on opposite sides of the inner wall of the filter housing 202. Each inclined plate 203 has an arc-shaped ash collection groove 204 on its upper surface.

[0028] In this application, the intersecting inclined plates 203 can prevent flue gas from being discharged vertically at high speed, thus extending the heat exchange time. The arc-shaped ash trough 204 can guide dust to fall naturally, reducing ash accumulation and blockage.

[0029] In some embodiments, the filter housing 202 is provided with two inclined plate groups, each of the inclined plates 203 being spaced apart along the flue gas flow direction within the filter housing 202, and together forming a non-linear flue gas meandering channel.

[0030] In this application, each inclined plate group is arranged at intervals along the flue gas direction, which can jointly form a non-linear tortuous channel, further extending the flue gas residence time, making heat exchange more complete and waste heat recovery efficiency higher.

[0031] refer to Figure 2 In some embodiments, a triangular plate 212 is provided on the inner wall of the filter processing shell 202 located between adjacent inclined plates 203.

[0032] In this application, the tapered inclined surface of the triangular plate 212 can guide the dust to slide off, prevent the dust from adhering to the inner wall of the shell, and ensure smooth flow and stable heat exchange.

[0033] refer to Figure 4 In some embodiments, the surface of the inclined plate 203 facing the bottom end of the filter processing shell 202 is provided with a serpentine tube 205, and fins 211 are arranged on the surface of the serpentine tube 205. The serpentine tubes 205 provided on each of the inclined plates 203 are connected to each other through a conveying pipe 206 to form a media flow loop, wherein the inlet end of the media flow loop is connected to a main water inlet pipe 217, and the outlet end is connected to a main drain pipe 218.

[0034] In this application, the serpentine tube 205 and fins 211 increase the heat exchange contact area and, together with the conveying pipe 206, form a circulation loop, which can efficiently absorb waste heat from the flue gas. The cross-arranged inclined plates 203 can prolong the residence time of the flue gas, making heat exchange more complete and significantly improving the waste heat recovery and utilization rate. At the same time, the structure of the fins 211 avoids dust accumulation and ensures long-term stable operation.

[0035] In some embodiments, each inclined plate 203 is provided with a plurality of serpentine tubes 205 at intervals, and the plurality of serpentine tubes 205 are connected in series. The series connection of the plurality of serpentine tubes 205 can extend the medium flow path, thereby increasing the heat exchange stroke and further improving the waste heat recovery efficiency.

[0036] refer to Figure 2 and Figure 5 In some embodiments, the top of the sealing cover 207 is provided with an upper filter screen 219, the bottom of the filter processing shell 202 is provided with a lower filter screen 220, and a trapezoidal filter screen 213 is provided on the upper side of the lower filter screen 220. Drainage grooves 214 are provided between the mesh arrays of the trapezoidal filter screen 213.

[0037] In this application, the lower filter screen 220, the trapezoidal filter screen 213, and the upper filter screen 219 form a three-stage filtration system, intercepting dust particles of different sizes in the flue gas step by step to improve purification accuracy. The drainage grooves 214 between the mesh openings of the trapezoidal filter screen 213 can promptly drain sprayed wastewater, preventing water accumulation and blockage of the flow channel, ensuring smooth flue gas flow, and achieving efficient operation of heat exchange and dust removal in synergy.

[0038] Continue to refer to Figure 5 In some embodiments, the lower filter screen 220 is provided with a fluid diversion groove 216, and the open end of the drain groove 214 is connected to a square drain pipe 215 that extends downward through the lower connecting shell 201. The drain groove 214 is configured to extend from the middle of the trapezoidal filter screen 213 to the edge, and the outlet end of the drain groove 214 corresponds to the position of the fluid diversion groove 216.

[0039] In this application, the drainage trough 214 extends from the middle of the trapezoidal filter screen 213 to the edge, collects the sprayed wastewater, and discharges it through the square drain pipe 215. The fluid guide channel 216 on the lower filter screen 220 is connected to the outlet end of the drainage trough 214 to form a directional flow channel, ensuring smooth discharge of wastewater, avoiding backflow of accumulated liquid that may interfere with the heat exchange and filtration process, and ensuring long-term stable operation of the equipment.

[0040] like Figure 2-3As shown, in some embodiments, a spray assembly 3 is also included, which is installed inside the heat exchange assembly 2. The spray assembly 3 includes an F-type diversion pipe 301, a control valve 303 located at the inlet of the F-type diversion pipe 301, and an atomizing nozzle 302 connected to the output end of the F-type diversion pipe 301.

[0041] In this application, the inlet water flow rate is adjusted by the control valve 303, and the F-type diversion pipe 301 distributes the medium evenly, so that the atomizing nozzle 302 sprays out fine droplets to capture large dust particles in the flue gas, thereby achieving efficient spraying and settling purification.

[0042] In some embodiments, the number of atomizing nozzles 302 is two sets, and the two sets of atomizing nozzles 302 are symmetrically arranged in the inner cavity of the filter processing shell 202 and arranged on both sides of the top of the inner cavity. The spraying direction of the two sets of atomizing nozzles 302 is set towards the central area of ​​the filter processing shell 202.

[0043] In this application, two sets of atomizing nozzles 302 are symmetrically arranged on both sides of the top of the inner cavity and spray towards the central area, which can expand the atomization coverage and make the droplets fully contact the flue gas, thereby improving the dust collection and settling efficiency.

[0044] The heat exchanger of this application includes a support leg 1, a heat exchange assembly 2, and a spray assembly 3. The heat exchange assembly 2 is assembled vertically by a lower connecting shell 201, a filter shell 202, and a sealing cover 207 via a slot 208, a snap-fit ​​boss 209, and bolts 210. The filter shell 202 has cross-arranged inclined plates 203 and an arc-shaped ash trough 204. Below the inclined plates 203, a serpentine tube 205 with fins 211 is arranged. The serpentine tube 205 is connected to the main water inlet pipe 217 and the main drain pipe 218 via a conveying pipe 206 to form a medium circulation, and is equipped with a triangular plate 212 and a multi-layer filter screen to guide the flow and prevent ash.

[0045] The spray assembly 3 consists of an F-type diversion pipe 301, a control valve 303, and an atomizing nozzle 302. It can spray and settle large particulate dust in the flue gas, and the sprayed wastewater flows through a diversion channel. This application adopts a modular assembly structure, which is convenient for disassembly and maintenance. It can increase the heat exchange contact area and extend the heat exchange time of the flue gas. It has both waste heat recovery and flue gas dust removal and purification functions. It is not prone to dust accumulation and blockage, operates stably, and is suitable for industrial flue gas treatment applications.

[0046] This application provides a modular flue gas waste heat recovery heat exchanger, which aims to improve the problems of traditional waste heat recovery equipment, such as inconvenient disassembly and maintenance of the integral structure, easy adhesion and blockage of heat exchange components by flue gas dust, low waste heat recovery rate due to insufficient flue gas residence time for heat exchange, and lack of integrated dust removal structure requiring frequent shutdowns for cleaning, which affects continuous operation.

[0047] Specifically, refer to Figures 1-5The present application provides a combined assembled flue gas waste heat recovery heat exchanger, including four support legs 1 for supporting the structure, heat exchange components 2 are fixedly connected to the top of the four support legs 1, and spray components 3 are installed inside the heat exchange components 2.

[0048] The heat exchange assembly 2 includes a lower connecting shell 201 for support, and a filter shell 202 is connected to the upper end of the lower connecting shell 201. The filter shell 202 has four inclined plates 203 inside, and each inclined plate 203 has an arc-shaped ash collection groove 204 on its upper surface. Four serpentine tubes 205 are connected to the lower surfaces of the four inclined plates 203, and the four serpentine tubes 205 are interconnected through multiple sets of conveying pipes 206.

[0049] The upper end of the filter housing 202 is connected to a sealing cap 207, and the upper ends of both the lower connecting housing 201 and the filter housing 202 are connected to slots 208. The lower ends of the filter housing 202 and the lower ends of the sealing cap 207 are connected to snap-fit ​​bosses 209. An upper filter screen 219 is provided on the upper end of the sealing cap 207. The lower connecting housing 201, the filter housing 202, and the sealing cap 207 are vertically nested together by the slots 208, the snap-fit ​​bosses 209, and the bolts 210.

[0050] Each serpentine tube 205 has fins 211 arranged on its surface. The serpentine structure of the serpentine tube 205 and the design of the fins 211 increase the hot air contact area and prevent dust from accumulating on the tube surface.

[0051] Four inclined plates 203 are arranged at an angle to each other on the left and right sides of the inner wall of the lower connecting shell 201. Through the design of the four inclined plates 203 intersecting each other and the arc-shaped dust collection trough 204 opened at the top, hot air can be blocked from being discharged vertically quickly, while dust is guided to fall naturally.

[0052] Four inclined plates 203 are vertically arranged with triangular plates 212 on the left and right sides of the inner wall of the filter housing 202 with adjacent vertical spacing. The conical inclined surface design of the vertically arranged triangular plates 212 prevents dust from adhering to the inner wall of the filter housing 202 for a long time, thus ensuring exhaust and heat exchange efficiency.

[0053] The filter housing 202 is equipped with a lower filter screen 220, and a trapezoidal filter screen 213 is provided at the upper end of the lower filter screen 220. Square drainage grooves 214 are provided on the left and right sides of the upper surface of the lower filter screen 220. The open end of the square drainage groove 214 is connected to a square drainage pipe 215. Fluid diversion grooves 216 are provided between the mesh holes on the upper surface of the trapezoidal filter screen 213.

[0054] The outer ends of the uppermost and lowermost serpentine pipes 205 are connected to the main inlet pipe 217 and the main outlet pipe 218. Through the design of the main inlet pipe 217, the main outlet pipe 218 and multiple sets of conveying pipes 206, the four serpentine pipes 205 form a circulating flow structure.

[0055] Specifically, the heat exchange medium is input into the serpentine tubes 205 through the main water inlet pipe 217, and the four sets of serpentine tubes 205 are circulated and connected through multiple sets of conveying pipes 206. Finally, the medium is discharged through the main drain pipe 218, forming a complete medium circulation channel, providing a continuous heat exchange carrier for the heat exchange process.

[0056] The serpentine structure of the serpentine tube 205 extends the medium flow path, and the fins 211 arranged on the tube surface significantly increase the contact area with the flue gas. At the same time, the four inclined plates 203 arranged crosswise on the inner wall of the filter shell 202 prevent the flue gas from being discharged vertically quickly, prolonging the residence time of the flue gas in the shell, allowing the flue gas to fully contact and exchange heat with the serpentine tube 205, and realizing the efficient transfer of the waste heat of the flue gas to the medium.

[0057] Dust is guided to fall naturally through the arc-shaped dust collection trough 204 on the inclined plate 203, while the vertically set triangular plate 212 uses its conical slope to prevent dust from adhering to the inner wall. The lower filter screen 220 and the trapezoidal filter screen 213 intercept dust impurities in the flue gas in stages. The fluid diversion channel 216 on the trapezoidal filter screen 213 and the square drainage channel 214 and square drainage pipe 215 on the lower filter screen 220 promptly discharge the sprayed wastewater, achieving effective separation and collection of dust, reducing dust accumulation and clogging, ensuring unobstructed heat exchange channels, and maintaining long-term stable and efficient operation of the equipment.

[0058] Furthermore, the spray assembly 3 includes an F-type diverter pipe 301, and two sets of atomizing nozzles 302 are vertically connected to the output end surface of the F-type diverter pipe 301.

[0059] A control valve 303 is vertically installed at one end of the inlet of the F-type diverter pipe 301. The inlet flow rate is regulated by the control valve 303. Combined with the atomized medium sprayed by the two sets of atomizing nozzles 302, large particulate dust in the flue gas can be sprayed, settled, and purified.

[0060] Specifically, by controlling the opening of valve 303 and regulating the inlet water flow, the purification medium (such as clean water) is precisely flowed into the F-type diversion pipe 301. Utilizing the branch structure of the F-type diversion pipe 301, the medium is evenly distributed to the two sets of atomizing nozzles 302 that are vertically connected at the output end.

[0061] Two sets of atomizing nozzles 302 atomize the purification medium into fine droplets, which are then evenly sprayed into the flue gas flow path inside the filter housing 202. The atomized droplets fully contact, collide, and adsorb large dust particles in the flue gas, forming even heavier dust droplets.

[0062] Dust droplets settle naturally under gravity and fall into the arc-shaped dust collection trough 204 of the inclined plate 203 or the bottom of the shell. They are then collected and processed by relevant structures, achieving rapid spraying and settling purification of large dust particles in the flue gas. This reduces the amount of dust entering the heat exchange channel, lowers the risk of equipment ash accumulation and blockage, and ensures stable heat exchange efficiency.

[0063] The working principle of the heat exchanger in this application includes: the user first places the four support legs 1 horizontally in the installation position, and then vertically nests and assembles the lower connecting shell 201, the filter treatment shell 202 and the sealing cover 207 into the heat exchange assembly 2 through the slot 208, the buckle boss 209 and the bolt 210, thus completing the construction and fixation of the main body of the equipment.

[0064] The user connects the external heat exchange medium pipeline to the main water inlet pipe 217. The medium flows into the serpentine tube 205 inside the filter treatment shell 202 through the main water inlet pipe 217. The serpentine tube 205 is connected in sequence through the delivery pipe 206. The medium flows along the serpentine path of the serpentine tube 205, absorbs heat, and flows out from the main drain pipe 218, forming a complete heat exchange medium circulation channel.

[0065] The flue gas to be treated enters the equipment from the bottom of the lower connecting shell 201, first passing through the lower filter screen 220 for preliminary filtration of large particulate impurities. The flue gas then flows upwards into the filtration shell 202. Blocked by the intersecting inclined plates 203, it cannot rise vertically quickly and can only flow meanderingly along the channels between the inclined plates 203, thus significantly extending the residence time of the flue gas within the shell and allowing for more thorough contact between the flue gas and the serpentine tube 205. The fins 211 on the surface of the serpentine tube 205 further increase the contact area between the flue gas and the tube body, significantly improving the efficiency of heat transfer from the flue gas to the heat exchange medium.

[0066] During the flow of flue gas, the dust it carries is blocked by gravity and the inclined plate 203, falling into the arc-shaped dust collection trough 204 on the inclined plate 203. The triangular plate 212 set on the inner wall of the filter housing 202 uses a conical inclined surface to prevent dust from adhering to the inner wall of the housing for a long time. At the same time, the user can adjust the flow rate of the purification medium in the F-type diversion pipe 301 according to the dust content of the flue gas by controlling the valve 303, so that the atomizing nozzle 302 sprays out a uniform atomized medium. The atomized droplets come into full contact with the large dust particles in the flue gas, forming dust-laden droplets and accelerating dust settling.

[0067] The settled dust-laden droplets and sprayed wastewater are first guided by the fluid diversion channel 216 on the trapezoidal filter screen 213, and then flow into the square drain pipe 215 through the square drain channel 214 on the lower filter screen 220, and are discharged outside the equipment. The flue gas, after heat exchange and preliminary purification, continues to flow upward, passing through the trapezoidal filter screen 213 and the upper filter screen 219 on the sealing cover 207 in sequence, completing the staged filtration, and finally being discharged from the top of the sealing cover 207, realizing the complete process of flue gas entering from the lower filter screen 220 and exiting from the upper filter screen 219.

[0068] In this application, the lower connecting shell 201, the filter shell 202, and the sealing cover 207 are vertically nested and assembled using the slots 208, the buckles 209, and the bolts 210. They are supported by the bottom support legs 1. The inclined plates 203, the serpentine tubes 205 with fins 211, and the conveying pipes 206 arranged crosswise inside the shell form a medium circulation channel, allowing the flue gas to enter from the lower filter screen 220, undergo heat exchange in a circuitous manner inside the shell, and then be discharged from the upper filter screen 219. This achieves modular and rapid disassembly and maintenance of the equipment, increases the heat exchange contact area of ​​the flue gas, extends the heat exchange time of the flue gas, and significantly improves the waste heat recovery and utilization rate of the flue gas.

[0069] In this application, a spray assembly 3 is formed by setting an arc-shaped ash collection trough 204, a triangular plate 212, and a trapezoidal filter screen 213 inside the filter treatment shell 202, and by arranging an F-type diversion pipe 301, a control valve 303, and an atomizing nozzle 302. The flow rate is regulated by the valve to allow the atomizing medium to spray and settle large dust particles in the flue gas. The sprayed wastewater is then discharged through a fluid diversion trough 216, a square drainage trough 214, and a square drainage pipe 215. This achieves simultaneous graded dust removal and purification during the flue gas heat exchange process, effectively preventing ash accumulation and blockage on the inner wall of the shell and the heat exchange pipes, and ensuring long-term stable and efficient operation of the equipment.

[0070] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A modular, assembled flue gas waste heat recovery heat exchanger, characterized in that, include: A heat exchange assembly, and a support leg connected to and providing support to the heat exchange assembly; The heat exchange assembly includes a vertically nested lower connecting shell, a filter shell, and a sealing cover; The lower connecting shell and the upper end of the filter processing shell are both provided with slots, and the lower end of the filter processing shell and the lower end of the sealing cover are both provided with buckle protrusions that are adapted to the slots. The lower connecting shell, the filter processing shell, and the sealing cover are configured to snap together via the slot and the buckle protrusion, and the slot and the buckle protrusion are detachably connected via a connector.

2. The combined assembled flue gas waste heat recovery heat exchanger according to claim 1, characterized in that, The connector includes bolts; the filter processing shell is provided with at least one inclined plate group, the inclined plate group includes two inclined plates arranged in a cross-shaped inclination and set on opposite sides of the inner wall of the filter processing shell, and each inclined plate is provided with an arc-shaped ash drop groove.

3. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 2, characterized in that, The filter housing is provided with two inclined plate groups. Each inclined plate is arranged at intervals along the flue gas flow direction in the filter housing and together form a non-linear flue gas meandering channel.

4. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 2 or 3, characterized in that, A triangular plate is provided on the inner wall of the filter processing shell located between adjacent inclined plates.

5. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 2, characterized in that, The inclined plate has a serpentine tube on its surface facing the bottom of the filter housing, and fins are arranged on the surface of the serpentine tube. The serpentine tubes on each of the inclined plates are connected to each other through a conveying pipe to form a medium flow loop. The inlet end of the medium flow loop is connected to a main water inlet pipe, and the outlet end is connected to a main drain pipe.

6. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 5, characterized in that, Each of the inclined plates is provided with a plurality of serpentine tubes at intervals, and the plurality of serpentine tubes are connected in series.

7. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 6, characterized in that, The top of the sealing cover is provided with an upper filter screen, the inside of the filtration shell and at the bottom is provided with a lower filter screen, and a trapezoidal filter screen is provided on the upper side of the lower filter screen, wherein a drainage groove is provided between the mesh array of the trapezoidal filter screen.

8. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 7, characterized in that, The lower filter screen is provided with a fluid diversion groove, and the open end of the drain groove is connected to a square drain pipe that extends downward through the lower connecting shell; wherein, the drain groove is configured to extend from the middle of the trapezoidal filter screen to the edge, and the water outlet end of the drain groove corresponds to the position of the fluid diversion groove.

9. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 1, characterized in that, It also includes a spray assembly installed inside the heat exchange assembly. The spray assembly includes an F-type diverter pipe, a control valve located at the inlet of the F-type diverter pipe, and an atomizing nozzle connected to the output end of the F-type diverter pipe.

10. A combined, assembled flue gas waste heat recovery heat exchanger according to claim 9, characterized in that, The number of atomizing nozzles is two sets, which are symmetrically arranged in the inner cavity of the filter housing and on both sides of the top of the inner cavity. The spray direction of the two sets of atomizing nozzles is set towards the central area of ​​the filter housing.

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