A high-temperature smoke dust removal heat exchange integrated device

Abstract

The application discloses a high-temperature smoke dust removal and heat exchange integrated device. The device has a shell, at least two smoke inlet pipes arranged in the upper region of the shell and connected at the two ends of a porous mesh cover to form an impingement confluence region, a flow guide pipe vertically arranged in the inner cavity of the shell and located below the smoke inlet pipe, the upper end of the flow guide pipe being in communication with the region where the smoke inlet pipe is located and the formed communication region being separated from the outside of the flow guide pipe, the upper end of the flow guide pipe being aligned with the porous mesh cover, a filtering device horizontally arranged in the inner cavity and located below the flow guide pipe, the filtering device being provided with smoke passing holes and being aligned with the lower end outlet of the flow guide pipe, and a working medium flow pipe arranged at the periphery of the flow guide pipe and a heat exchange pipe located in the working medium flow pipe, so that the rebounded and filtered flue gas is discharged after heat exchange. The device can remove dust from high-temperature flue gas and then perform heat exchange, and the flue gas treatment efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of environmental protection technology, and in particular to an integrated high-temperature flue gas removal and heat exchange device. Background Technology

[0002] During biomass combustion, a large amount of high-temperature, dust-laden flue gas is generated. This flue gas is not only the main carrier of heat loss but also a significant source of dust pollutant emissions. The furnace outlet temperature of most biomass boilers is typically controlled between 600°C and 900°C. Furthermore, in the tail flue, the high-temperature, dust-laden flue gas requires further heat exchange. When the flue gas temperature drops sufficiently, baghouse dust collectors are usually used to collect fly ash. For a long time, the treatment of this type of flue gas in the biomass combustion field has generally adopted a traditional series process route of "first recovering waste heat, then cooling and dust removal." However, this technical solution, which physically separates dust removal and heat exchange, has inherent drawbacks. The main problems are: 1) Fly ash released from the furnace outlet has a low melting point and is prone to deposit on the heating surface of the tail flue, which seriously weakens the heat transfer efficiency and increases the system resistance; 2) Under low temperature conditions, fly ash is also prone to adhere to the filter bags, thereby increasing the load and operating cost of the dust removal equipment; 3) At present, the filtration capacity of bag filters for fine particulate matter (PM2.5) is still limited, and there is an urgent need to adopt special technologies to effectively control the emission of fine particulate matter.

[0003] Patent application number 201520549109.0 discloses an integrated dust removal and heat exchange device for boilers. This device integrates a lower dust removal unit and an upper heat exchange unit within its body. Flue gas enters through the bottom inlet and first passes through a ceramic membrane tube for dust removal. Dust is adsorbed onto the outer wall of the tube and periodically cleaned by a backflushing device, with the ash discharged through the bottom ash outlet. The purified flue gas continues to rise and exchange heat with the heat exchange unit, finally exiting through the top outlet. However, under long-term high-temperature environments, the ceramic membrane tube material may be damaged, and the integrated structure is internally complex, making maintenance and component replacement difficult.

[0004] Patent application number 201710012975.X discloses an integrated dust removal and heat exchange treatment device and method for high-temperature flue gas. The device mainly consists of dust removal and heat exchange tubes, including a metal filter membrane, a metal honeycomb frame, and heat exchange tubes. The overall casing is divided into a lower dust removal and heat exchange zone and an upper deep heat exchange zone. High-temperature dust-laden flue gas enters from the bottom, first undergoes dust removal through the metal filter membrane, and then exchanges heat counter-currently with the air inside the heat exchange tubes through the metal honeycomb frame. The purified flue gas continues to rise into the deep heat exchange zone for further heat exchange, and finally, the clean flue gas is discharged from the top, while the heated air is output from the bottom of the heat exchange tubes. However, while the metal honeycomb frame enhances heat exchange, it also increases airflow resistance, potentially leading to increased system energy consumption. Furthermore, the device has a complex structure, especially the connection, sealing, and vibration transmission structures of the multi-tube bundle and manifold, which are prone to uneven thermal stress, fatigue at connections, or leakage under high-temperature conditions.

[0005] Patent application CN202010537597.9 discloses a high-temperature dust removal and heat exchange integrated device. This device includes a gas chamber shell, an internally installed impact-type flat plate dust collector, and circumferentially arranged impact-type dust collection plates for initial dust interception. After initial dust removal, the flue gas enters the lower dust collection heat exchanger. This heat exchanger uses an inner cylinder with built-in impact-type heat exchange and dust removal pipes for heat exchange, and collects settled dust through a blind dust collection pipe at the bottom (composed of a conical shell and a lower ash shell). The purified flue gas is finally discharged from the side flue gas outlet. However, the internal structure is still relatively complex, containing multiple dust collection plates and baffles, which may pose a risk of wear or blockage during long-term operation; for dust with extremely small particle size or high viscosity, the efficiency of the impact-type dust removal method may be limited.

[0006] Patent application number 202323183484.1 discloses a boiler dust removal device. The device includes a pipe with symmetrical openings on both sides. A filtration mechanism consisting of a left and a right filter frame is slidably installed at each opening, with filter plates inside both filter frames. A support plate is located outside the pipe openings, with a slot on its side for a collection trough to engage. In use, either the left or right filter frame is placed inside the pipe. Flue gas from the boiler combustion enters the pipe and is filtered by the filter plates to remove solid particles. When cleaning the filter plates, the filter frame outside the pipe is pushed in, pushing the original filter frame inside the pipe onto the support plate. The collection trough is then fixed in place by a locking block engaging with the slot. Wastewater generated from rinsing the filter plates is collected in the collection trough. However, the device uses filter plates as the core filtration component, which has limited filtration efficiency for high-concentration, fine-particle dust; after rinsing and cleaning, an additional hot air blower is required to dry the filter plates, increasing energy consumption and equipment configuration complexity; it only has a single dust removal function and does not have a heat exchange structure, so it cannot recover and utilize the waste heat in the boiler flue gas, resulting in energy waste.

[0007] In summary, few existing patented technologies can simultaneously achieve efficient fine particulate matter capture and full recovery of flue gas heat in an integrated manner. Therefore, developing an integrated technology and equipment that combines fine particulate matter emission reduction with efficient utilization of flue gas waste heat is not only of great practical significance for improving energy efficiency and reducing pollutant emissions, but will also strongly promote the green and low-carbon transformation of energy-intensive industries, providing key technological support for their sustainable development. Summary of the Invention

[0008] This application provides an integrated high-temperature flue gas removal and heat exchange device to address the current situation where existing high-temperature flue gas removal and heat exchange devices cannot efficiently and collaboratively remove fine particles and recover flue gas heat.

[0009] An embodiment of the present invention provides an integrated high-temperature flue gas removal and heat exchange device, comprising:

[0010] The shell has an internal cavity formed inside it;

[0011] At least two smoke inlet pipes are provided in the upper region of the housing. The first end of the smoke inlet pipe located on the outside of the housing is used to connect to the smoke to be treated, and the second end of the smoke inlet pipe located on the inside of the housing is opposite to it.

[0012] A porous mesh cover has at least two connecting ends and a receiving space located between the connecting ends. The wall of the receiving space is provided with a smoke outlet that connects the inside and outside of the receiving space. The connecting ends are respectively sealed to the second end of the smoke inlet pipe, and an impact confluence area is formed between the opposite second ends of the smoke inlet pipe in the receiving space.

[0013] A flow guide tube is vertically installed in the inner cavity and located below the porous mesh cover. The upper end of the flow guide tube is connected to the area where the porous mesh cover is located, and the connected area is separated from the area where the outer side of the upper end face of the flow guide tube is located. The upper end of the flow guide tube is aligned with the center of the porous mesh cover.

[0014] A filter device is horizontally installed in the inner cavity and located below the guide tube. The filter device is provided with a smoke passage hole aligned with the lower outlet of the guide tube. The filter device around the smoke passage hole is configured as a filter area.

[0015] A working fluid flow tube is located below the area where the porous mesh cover is situated and above the filter device, and is situated around the flow guide tube. A heat exchange tube is installed inside the working fluid flow tube, with both ends of the heat exchange tube exposed outside the working fluid flow tube. The lower end of the heat exchange tube connects to the area between the upper side of the filter device and the working fluid flow tube, and the upper end of the heat exchange tube connects to the area between the upper side of the working fluid flow tube and the area below the porous mesh cover. The two ends of the heat exchange tube are connected only through the heat exchange tube itself. Working fluid inlet and outlet are respectively provided on the shell at the two openings of the working fluid flow tube. A flue gas outlet is provided on the shell in the area connected by the upper end of the heat exchange tube.

[0016] An ash hopper is located below the filter device.

[0017] Preferably, the smoke inlet pipe is horizontally arranged.

[0018] Preferably, the diameter of the lower outlet of the guide pipe is smaller than the sum of the diameters of all the smoke inlet pipes.

[0019] Preferably, the diameter of the lower outlet of the guide pipe is the same as the diameter of the smoke inlet pipe.

[0020] Preferably, the diameter of the upper inlet of the guide pipe is less than or equal to the sum of the diameters of all the smoke inlet pipes.

[0021] Preferably, an annular baffle coaxial with the guide tube is provided inside the guide tube.

[0022] Preferably, multiple annular baffles are provided, and the inner diameter of the annular baffles gradually decreases from top to bottom.

[0023] Preferably, the filtration device is a multi-layer stainless steel sintered filter plate.

[0024] Preferably, the diameter of the smoke passage is approximately equal to the diameter of the lower outlet of the guide pipe.

[0025] Preferably, the area below the porous mesh cover is connected to the upper opening of the guide pipe to form a funnel shape.

[0026] Preferably, the filter device is radially distributed throughout the inner cavity at its location.

[0027] Beneficial effects

[0028] Embodiments of the present invention provide an integrated high-temperature flue gas dust removal and heat exchange device, which transforms the traditional series connection method of cooling followed by dust removal into a method of dust removal followed by heat exchange, thereby improving the heat exchange efficiency of the flue gas and reducing the emission of fine particles in the flue gas. Specifically, this device has the following advantages:

[0029] 1) To improve the removal efficiency of fine particulate matter, this solution employs impact flow technology for pretreatment of dust-laden flue gas within a confined space. The core mechanism of this technology involves introducing a hood: when particles collide with the stainless steel hood wall, they bounce back, and some particles are thus guided back to the core impact zone. The purpose is to artificially increase the collision probability of particles in the flow field, thereby actively promoting the aggregation of fine particulate matter and creating favorable conditions for subsequent efficient removal.

[0030] 2) By comprehensively utilizing the inertial collision mechanism and the filtration and dust removal mechanism, the guide pipe can cause fine particles to gather in the center of the pipe and accelerate, thereby causing larger agglomerated particles to settle directly. Then, the filtration device is used to filter and remove the flue gas particles that have not settled and flowed back, so as to achieve the early removal of coarse particles and the deep purification of fine particles in the dust-laden flue gas, reflecting the graded dust removal strategy of "coarse first and fine later".

[0031] 3) Based on the concept of dust removal before heat exchange, and since the dust removal process does not involve cooling, it can retain heat to the maximum extent and significantly improve the heat exchange efficiency of the heat exchanger, which can reach 10% to 30%;

[0032] 4) The dust removal and heat exchange functions are integrated into one unit, and the dust diversion acceleration and heat exchange area are set at the same height. The overall structure is compact, occupies a small area, and is easy to maintain.

[0033] 5) This technology and equipment are applicable to boilers of different sizes and other similar industrial flue gas treatment scenarios, and have good prospects for promotion and application. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of an integrated high-temperature flue gas removal and heat exchange device according to an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of airflow collision and aggregation in the impact confluence zone in an embodiment of the present invention.

[0037] The meanings of the various reference numerals in the figure are as follows:

[0038] 0. Shell; 1. Left flue gas inlet pipe; 2. Right flue gas inlet pipe; 3. Impact confluence area; 4. Guide pipe; 5. Filter device; 6. Ash hopper; 7. Heat exchanger tube; 8. Flue gas outlet; 9. Working fluid inlet; 10. Working fluid outlet; 11. Annular baffle; 12. Valve; 13. Flue gas passage hole; 14. Working fluid flow pipe; 15. Perforated mesh cover. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] like Figure 1 The diagram shown is a schematic of an integrated high-temperature flue gas removal and heat exchange device according to an embodiment of the present invention. Figure 1 It is understood that the aforementioned high-temperature flue gas removal and heat exchange integrated equipment includes:

[0043] The shell 0 has an inner cavity inside, in which cleverly designed flow channels are set to complete the removal and heat exchange of high-temperature dust.

[0044] There are at least two smoke inlet pipes located in the upper region of the housing 0. The first end of the smoke inlet pipe located outside the housing 0 is used to connect to the smoke to be treated, and the second end of the smoke inlet pipe located inside the housing 0 is opposite to it.

[0045] The porous mesh cover 15 has at least two connecting ends and a receiving space located between the two connecting ends. The wall of the receiving space is provided with smoke outlets communicating with the inside and outside of the receiving space. The connecting ends are respectively sealed to the second ends of the two smoke inlet pipes, forming an impact confluence area 3 between the opposing second ends of the smoke inlet pipes in the receiving space. In this embodiment, there are two smoke inlet pipes and the porous mesh cover 15 has two connecting ends. In other embodiments, more smoke inlet pipes can be provided, preferably arranged symmetrically in an even number, i.e., each pair of smoke inlet pipes keeps its second ends facing each other.

[0046] like Figure 1 In the illustrated embodiment, the porous mesh cover 15 is a horizontally placed cylindrical shape. The smoke inlet pipe includes a left smoke inlet pipe 1 and a right smoke inlet pipe 2. The left smoke inlet pipe 1 and the right smoke inlet pipe 2 form a sealed connection with the openings at both ends of the cylinder of the porous mesh cover 15, and the smoke inlet pipes are close to the upper edge of the housing 0. The smoke dust exiting from the second end of the left smoke inlet pipe 1 and the second end of the right smoke inlet pipe 2 collides head-on with the impact confluence area 3 in the accommodating space, causing agglomeration. After the collision, some of the smoke dust is propelled towards the walls around the accommodating space by inertia, colliding with the mesh wall of the porous mesh cover 15 and rebounding. Some of this rebound is deflected back to the center of the impact confluence area 3 instead of being scattered and escaped, making the fine dust more agglomerated. Under the action of the porous mesh cover 15, the smoke dust aggregation and agglomeration effect is good.

[0047] In some embodiments, the smoke outlet holes are preferably evenly arranged on the surface of the cylinder, with an opening rate of 40%-50%. The diameter of the smoke outlet holes is preferably set to 4mm-6mm, which is larger than the size of the smoke dust agglomerates to facilitate their eventual overflow from the smoke outlet holes of the porous mesh cover 15.

[0048] In some embodiments, the porous mesh cover 15 is made of stainless steel, such as 310S, 304 or 316L stainless steel.

[0049] In some embodiments, the diameter of the porous mesh cover 15 is 3-5 times the diameter of the smoke inlet pipe, and the distance between the two opposite ends of the smoke inlet pipe is controlled at 8mm-13mm, for example, 10mm. Preferably, the smoke inlet pipe is arranged symmetrically with respect to the center of the porous mesh cover 15, so that the impact confluence area 3 is located in the central region of the porous mesh cover 15, and the impact velocity of the flue gas is controlled at 15m / s-20m / s, so that high-speed collisions occur within the aforementioned impact distance of approximately 10mm. Figure 2 As shown, the porous mesh cover 15 provides ample space for aggregation after impact in the radial direction. Due to the continuous high-speed entry of flue gas from the inlet pipe into the porous mesh cover 15, creating axial pressure, the flue gas can hardly escape axially within this space. The main flow direction of the flue gas is radially outward, i.e., as shown... Figure 2The upward or downward movement shown, whether flowing upward or downward, returns to the center of the impact confluence area 3 after colliding with the mesh wall. If it happens to overflow from the smoke outlet, it also concentrates near the central area of ​​the porous mesh 15. Thus, the smoke overflowing from the top bounces downward due to colliding with the upper wall of the shell, while the smoke overflowing from the bottom moves directly downward.

[0050] The aforementioned integrated device also includes a guide tube 4, which is vertically arranged in the inner cavity and located below the center of the porous mesh cover 15. The upper end of the guide tube 4 communicates with the area where the porous mesh cover 15 is located, and the connected area is separated from the area of ​​the outer side below the upper end surface of the guide tube 4. Figure 1 As shown, preferably, the area below where the porous mesh cover 15 is located is connected to the upper opening of the guide pipe 4 to form a funnel shape. The upper end of the guide pipe 4 is aligned with the center of the porous mesh cover 15, so that the airflow overflowing from the porous mesh cover 15 moves into the guide pipe 4 and moves vertically downward along the guide pipe 4.

[0051] The integrated device also includes a filter device 5, which is horizontally arranged in the inner cavity and located below the guide pipe 4. The filter device 5 is provided with smoke passage holes 13 aligned with the lower outlet of the guide pipe 4, and the filter device 5 is configured with a filtration area around the smoke passage holes 13. Preferably, the diameter of the smoke passage holes 13 is approximately the same as the diameter of the lower outlet of the guide pipe 4.

[0052] Preferably, the filter device 5 is a multi-layer sintered stainless steel filter plate, such as... Figure 1 The diagram shows a multi-layer stainless steel sintered filter plate used in the filter device 5. It has a smoke passage hole 13 in the middle and the filter plate body is surrounded by the smoke passage hole 13. Preferably, the multi-layer stainless steel sintered filter plate includes 2-5 layers of stainless steel wire. The material is a metal that can withstand high temperature, such as 304 or 316L stainless steel. The filtration accuracy of the multi-layer stainless steel sintered plate reaches 1μm.

[0053] In some embodiments, if the amount of flue gas to be processed is very large, multiple integrated devices as in this embodiment can be configured to divert the flue gas to multiple integrated devices for parallel processing.

[0054] In some other embodiments, if the flue gas being treated is very large, the multi-layer stainless steel sintered filter plate can be replaced with a certain number of filter cartridges, with the same position of the smoke passage hole 13 left in the middle. The filter cartridges are arranged around the smoke passage hole 13 to increase the filtration area and thus increase the filtration effect.

[0055] Due to the guiding effect, the gas, which originally converged in the guide pipe 4 and descended rapidly, maintained its converged state as the airflow exiting from the lower end of the guide pipe 4 passed through the smoke passage 13 and entered the area below the filter device 5. A dust collection hopper 6 is located below the filter device 5. Larger dust particles impact the dust collection hopper 6 at high speed and accumulate further, unable to rebound with the lighter dust particles, and are deposited in the dust collection hopper 6. Lighter dust particles and gases dispersed in the dust collection hopper 6 rebound and are further intercepted by the filter device 5, ultimately re-entering a relatively clean area of ​​flue gas above the filter device 5.

[0056] During operation, fly ash will accumulate below the filter device 5 to form a filter cake. It is preferable to set a pulse airflow above the filter device 5 to periodically purge it.

[0057] Considering that under special circumstances, the filter device 5 may be clogged by fly ash particles, affecting the safe operation of the device, a section is left unsealed between the upper edge of the filter device 5 and the lower outlet of the guide pipe 4. Even when the filter device 5 is completely clogged, the flue gas can still escape through the smoke passage 13 in the middle of the filter device 5 to ensure the safe operation of the device.

[0058] The aforementioned integrated device also includes a working fluid flow pipe 14, located below the area where the porous mesh cover 15 is situated and above the filter device 5, and situated around the guide pipe 4. A heat exchange pipe 7 is disposed within the working fluid flow pipe 14, with both ends of the heat exchange pipe 7 exposed outside the working fluid flow pipe 14. The lower end of the heat exchange pipe 7 connects to the area between the upper side of the filter device 5 and the working fluid flow pipe 14, and the upper end of the heat exchange pipe 7 connects to the area between the upper side of the working fluid flow pipe 14 and the area below the area where the porous mesh cover 15 is situated. The two ends of the heat exchange pipe 7 are connected only through the heat exchange pipe 7 itself. The working fluid flow pipe 14 is horizontally positioned within the inner cavity, and its two ports are respectively sealed to the housing 0. The housing 0 at the ports is respectively provided with working fluid inlets and outlets, such as... Figure 1 As shown, the working fluid inlet 9 is located on the left side of the shell 0, and the working fluid outlet 10 is located on the right side of the shell 0. The working fluid outlet 10 is higher than the working fluid inlet 9, so that the working fluid can fill the entire working fluid flow tube 14 to ensure sufficient contact with the heat exchange tube 7. A flue gas outlet 8 is provided on the shell 0 in the area connected to the upper end of the heat exchange tube 7. The aforementioned second fluid enters the heat exchange tube 7 from the lower end and overflows from the upper end of the heat exchange tube 7. Since there is a relatively cold working fluid flow inside the working fluid flow tube 14 and outside the heat exchange tube 7, it can exchange heat with the flue gas inside the heat exchange tube 7, thereby transferring the heat in the flue gas to the working fluid for subsequent use. The cooled flue gas is discharged from the integrated device through the flue gas outlet 8.

[0059] The aforementioned integrated device allows high-temperature dust to move downwards through the flow channels within the casing 0 until it reaches the bottom ash hopper 6. Some larger dust particles remain in the ash hopper 6, while the remaining dust moves upwards and is filtered by the filter device 5. The filtered dust then flows above the filter device 5 and enters the heat exchange area. After heat exchange with the working fluid, it is discharged from the flue gas outlet 8. During this process, the high-temperature dust first collides and agglomerates in the porous mesh cover 15, then accelerates downwards in the guide pipe 4. Due to inertia, larger particles directly settle onto the bottom ash hopper 6. Because the dust particles are large and move quickly, the deposition rate in the ash hopper 6 is high. The remaining fine dust is further filtered by the filter device 5 and falls onto the bottom ash hopper 6, thus ensuring efficient dust filtration. Unlike methods that rely on cooling for dust removal, this application utilizes the design of the pipe layout and shape to enable high-temperature dust to undergo collision agglomeration, acceleration, and collision settling processes without additional external power. This significantly preserves the heat within the high-temperature dust, thereby improving heat recovery efficiency. Furthermore, the entire flow channel design makes full use of space, allowing the integrated device to complete all processes within a controllable overall volume.

[0060] like Figure 1 In the embodiment shown, the housing 0 is generally cylindrical above the area corresponding to the filter device 5, and funnel-shaped below the area corresponding to the filter device 5, with the top larger than the bottom, and is vertically arranged coaxially. The smoke inlet pipes are horizontally arranged on both sides, that is, the central axes of the left and right smoke inlet pipes are coaxial and 180° apart. In this way, the two opposing airflows can collide at maximum relative speed, such as... Figure 2 As shown, the two airflows collide and agglomerate within the porous mesh cover 15 under the action of the impacting flow. After the collision, some of the dust particles are propelled towards the walls around the containment space by inertia, colliding with the mesh walls and rebounding. Some of these particles are deflected back to the center of the impact convergence area instead of scattering and escaping, further agglomerating the fine dust. The porous mesh cover 15 effectively aggregates and agglomerates the dust particles. The optimal diameter of the smoke outlet holes is 4mm-6mm, larger than the size of the agglomerated dust particles, facilitating their eventual overflow from the smoke outlet holes of the porous mesh cover 15.

[0061] In some preferred embodiments, in order to achieve better settling effect when impacting the ash hopper 6, the diameter of the lower outlet of the guide pipe 4 is set to be smaller than the sum of the diameters of all the smoke inlet pipes during the flow guiding process. This allows the velocity of the airflow flowing out from the lower outlet of the guide pipe 4 to be greater than the velocity at the smoke inlet pipe, so that flow guiding and acceleration are achieved simultaneously.

[0062] In some preferred embodiments, the diameter of the lower outlet of the guide pipe 4 is the same as the diameter of the smoke inlet pipe. Figure 1 Taking the two smoke inlet pipes shown as examples, the inlet flue gas temperature is 800℃, and the diameter of the smoke inlet on each pipe is 30mm. The calculated cross-sectional area of ​​a single smoke inlet is 706.5mm², and the total cross-sectional area of ​​the left and right smoke inlets is 1413mm². When the flue gas velocity at both the left and right smoke inlets is 15m / s, the total flue gas flow rate is 76.3m³ / h. After the flue gas from both sides collides in the impact zone, it forms a downward airflow, which converges into the acceleration pipe. The acceleration pipe is equipped with baffles, causing the pipe diameter to gradually narrow until its outlet diameter matches the smoke inlet diameter (30mm), increasing the flue gas velocity to 30m / s.

[0063] In some preferred embodiments, to ensure that the flue gas does not decelerate under the action of the guide pipe 4, the diameter of the upper inlet of the guide pipe 4 is set to be less than or equal to the sum of the diameters of all the flue gas inlets. Thus, the flue gas maintains at least a constant velocity from the moment it enters the guide pipe 4. In some alternative embodiments, to ensure a uniform increase in velocity, it is preferable that the flue gas gradually accelerates under the action of the guide pipe 4. Therefore, it is advisable that the diameter of the guide pipe 4 gradually decreases until it is reduced to the size at the outlet of the guide pipe 4.

[0064] In some preferred embodiments, an annular baffle 11 coaxial with the guide pipe 4 is provided inside the guide pipe 4. The diameter of the guide pipe 4 is reduced by the annular baffle 11, and most particles flow in the center of the flow interface, avoiding flow along the wall surface, thus reducing the deposition of dust on the wall surface of the guide pipe 4.

[0065] In some preferred embodiments, in order to achieve the gradual reduction of the diameter of the guide tube 4, multiple annular baffles 11 are provided, and the inner diameter of the annular baffles 11 gradually decreases from top to bottom.

[0066] In some preferred embodiments, the filter device 5 is radially distributed throughout the inner cavity at its location, thereby ensuring that no smoke or dust flows from the gap between the filter device 5 and the inner cavity to the top of the filter device 5, thus guaranteeing the filtration effect.

[0067] In some optional embodiments, the planar dimensions of the filter device 5 and the dimensions of the housing 0 can be designed according to the velocity of the flue gas. Taking the above-mentioned operating conditions where the diameter of the flue gas inlets is 30mm and the flue gas velocity at the left and right inlets is 15m / s, based on the optimal filtration velocity of 0.015m / s, and using the ratio of the total flue gas flow rate to the filtration velocity, the planar area of ​​the filter device 5 can be calculated to be 1.413m². 2For example, the diameter of the circular multi-layer stainless steel sintered filter plate 5 is 1.34m, and the diameter of the cylinder in this area satisfies the interference fit with the filter device 5. Similarly, when the inlet flue gas velocity increases to 20m / s, the total flue gas flow rate increases to 101.7m³ / h. At this time, the required planar area of ​​the filter device 5 is 1.884㎡, and the corresponding planar diameter of the circular filter device 5 is 1.55m.

[0068] In some preferred embodiments, the ash hopper 6 is equipped with a valve 12. When the valve 12 is open, the ash hopper 6 is in communication with the filter device 5 above it. When the valve 12 is closed, the ash hopper 6 is not in communication with the filter device 5 above it. The ash hopper 6 is detachably mounted on the housing 0. Therefore, when the amount of ash accumulated in the ash hopper 6 is large, the valve 12 can be closed and the entire ash hopper 6 can be disassembled, the ash inside emptied, or the ash hopper 6 can be replaced and reinstalled on the housing 0. The valve 12 can then be opened for reuse.

[0069] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A high-temperature flue gas removal and heat exchange integrated device, characterized in that, include: The shell has an internal cavity formed inside it; At least two smoke inlet pipes are provided in the upper region of the housing. The first end of the smoke inlet pipe located on the outside of the housing is used to connect to the smoke to be treated, and the second end of the smoke inlet pipe located on the inside of the housing is opposite to it. A porous mesh cover has at least two connecting ends and a receiving space located between the connecting ends. The wall of the receiving space is provided with a smoke outlet that connects the inside and outside of the receiving space. The connecting ends are respectively sealed to the second end of the smoke inlet pipe, and an impact confluence area is formed between the opposite second ends of the smoke inlet pipe in the receiving space. A flow guide tube is vertically installed in the inner cavity and located below the porous mesh cover. The upper end of the flow guide tube is connected to the area where the porous mesh cover is located, and the connected area is separated from the area where the outer side of the upper end face of the flow guide tube is located. The upper end of the flow guide tube is aligned with the center of the porous mesh cover. A filter device is horizontally installed in the inner cavity and located below the guide tube. The filter device is provided with a smoke passage hole aligned with the lower outlet of the guide tube. The filter device around the smoke passage hole is configured as a filter area. A working fluid flow tube is located below the area where the porous mesh cover is situated and above the filter device, and is situated around the flow guide tube. A heat exchange tube is installed inside the working fluid flow tube, with both ends of the heat exchange tube exposed outside the working fluid flow tube. The lower end of the heat exchange tube connects to the area between the upper side of the filter device and the working fluid flow tube, and the upper end of the heat exchange tube connects to the area between the upper side of the working fluid flow tube and the area below the porous mesh cover. The two ends of the heat exchange tube are connected only through the heat exchange tube itself. Working fluid inlet and outlet are respectively provided on the shell at the two openings of the working fluid flow tube. A flue gas outlet is provided on the shell in the area connected by the upper end of the heat exchange tube. An ash hopper is located below the filter device.

2. The device according to claim 1, characterized in that, The smoke inlet pipe is set horizontally.

3. The device according to claim 1, characterized in that, The diameter of the lower outlet of the guide pipe is smaller than the sum of the diameters of all the smoke inlet pipes.

4. The device according to claim 1, characterized in that, The diameter of the lower outlet of the guide pipe is the same as the diameter of the smoke inlet pipe.

5. The device according to claim 1, characterized in that, The diameter of the upper inlet of the guide pipe is less than or equal to the sum of the diameters of all the smoke inlet pipes.

6. The device according to claim 1, characterized in that, An annular baffle, coaxial with the guide tube, is provided inside the guide tube.

7. The device according to claim 6, characterized in that, Multiple annular baffles are provided, and the inner diameter of the annular baffles gradually decreases from top to bottom.

8. The device according to claim 1, characterized in that, The filtration device is a multi-layer stainless steel sintered filter plate.

9. The device according to claim 1, characterized in that, The diameter of the smoke passage is approximately the same as the diameter of the lower outlet of the guide pipe.

10. The device according to claim 1, characterized in that, The area below the porous mesh cover is connected to the upper opening of the guide pipe to form a funnel shape.

11. The device according to claim 1, characterized in that, The filter device is radially distributed throughout the inner cavity at its location.

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