Flue gas purification CPM device based on double spraying and condensation trapping and working method
The flue gas purification device, which combines dual spraying and condensation capture, utilizes a set angle arrangement of the support mesh and fluoroplastic heat exchange tube bundle layers, along with a multi-layer gradient wire mesh structure. This solves the problems of low gaseous CPM capture efficiency and difficulty in releasing thermal stress in existing equipment, achieving highly efficient flue gas purification and heat transfer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG GUOSHUN CONSTR GRP
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-12
AI Technical Summary
Existing dust removal equipment has low efficiency in capturing gaseous CPM, and the thermal stress is difficult to release and the cleaning is incomplete, resulting in scaling and blockage of the tube bundle. In addition, the demister has insufficient processing efficiency and cannot capture both large droplets and small mist droplets.
The flue gas purification device employing dual spraying and condensation collection includes a lower spraying layer, a condensation collection unit, and an upper spraying layer. The condensation collection unit consists of a support mesh and a fluoroplastic heat exchange tube bundle layer. The demister is a multi-layer gradient metal wire mesh structure. The spraying layer is intermittently turned on for cleaning. The support mesh and the fluoroplastic heat exchange tube bundle layer are arranged at a set angle in the horizontal plane. The support mesh acts as a guide plate to ensure uniform distribution of the cleaning liquid.
It significantly improves the capture efficiency of gaseous CPM, avoids thermal stress damage and wear problems, enhances heat transfer effect, ensures thorough cleaning and efficient demisting of tube bundles, and reduces particle deposition rate and energy consumption.
Smart Images
Figure CN122006385A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of environmental flue gas treatment technology, specifically relating to a flue gas purification CPM device and its working method based on dual spraying and condensation capture. Background Technology
[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.
[0003] Flue gas from coal-fired power plants and industrial boilers, after wet desulfurization, is typically in a saturated state, carrying large amounts of water vapor and condensable particulate matter (CPM). These CPMs condense upon cooling in the atmosphere, becoming a significant source of PM2.5. Condensation capture technology removes CPMs efficiently by lowering the flue gas temperature, causing them to condense at low-temperature interfaces.
[0004] Existing dust removal equipment has extremely low efficiency in capturing gaseous CPM. During condensation, CPM condensate mixes with dust in the flue gas, easily forming a sticky scale layer on the heat exchange surface, leading to severe scaling and blockage in conventional tubular heat exchangers after long-term operation. Existing fixing methods restrict tube bundle displacement to some extent, making it difficult to fully release thermal stress. Furthermore, using the mesh size of the positioning mesh for fixing restricts the thermal expansion and sliding of the tube bundle, easily causing stress concentration. In addition, in the multi-layer tube bundle structure of existing dust removal equipment, the lower tube bundles are difficult to be thoroughly cleaned by spray water; the demister has insufficient processing efficiency when dealing with flue gas with high moisture content, resulting in water carryover in the chimney, and the single-mesh wire mesh is insufficient to capture both large droplets and tiny mist droplets. Summary of the Invention
[0005] To address the aforementioned problems, this invention provides a flue gas purification CPM device and its operating method based on dual spraying and condensation capture, which solves the problems of low capture efficiency of gaseous CPM, difficulty in releasing thermal stress, and incomplete cleaning in existing dust removal equipment.
[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a flue gas purification CPM device based on dual spraying and condensation collection, comprising: a tower body, wherein the interior of the tower body is provided with a lower spraying layer, a condensation collection unit, an upper spraying layer, and a demister arranged sequentially from bottom to top along the flue gas flow direction; the lower spraying layer is disposed above the flue gas inlet at the lower part of the tower body, and the condensation collection unit is disposed above the lower spraying layer; the condensation collection unit includes a support mesh, a first fluoroplastic heat exchange tube bundle layer, and a second fluoroplastic heat exchange tube bundle layer, wherein the support mesh is horizontally fixed to the inner wall of the tower body. The first fluoroplastic heat exchange tube bundle layer is placed on the upper part of the support net, and the second fluoroplastic heat exchange tube bundle layer is arranged on the lower part of the support net. Both the first and second fluoroplastic heat exchange tube bundle layers are composed of multiple fluoroplastic heat exchange tubes, which are arranged at a set angle to each other in the horizontal plane. The upper spray layer is arranged above the condensation collection unit, and its spray direction is towards the condensation collection unit. The demister is arranged above the upper spray layer.
[0007] As a further implementation, the demister is a multi-layer gradient metal wire mesh structure, which includes at least two layers of metal wire mesh with different mesh counts arranged sequentially from bottom to top, with the mesh count of the lower layer being smaller than that of the upper layer, forming a gradient filtration structure from coarse to fine.
[0008] As a further implementation, the demister includes three layers of metal wire mesh, from bottom to top: the first layer is an 80-100 mesh metal wire mesh, used to intercept large droplets and uniformly distribute airflow; the second layer is a 120 mesh metal wire mesh, used to capture medium-sized droplets; and the third layer is a 150 mesh metal wire mesh, used to efficiently capture tiny droplets.
[0009] As a further implementation, the wire mesh is made of corrosion-resistant stainless steel, specifically 304 or 316L stainless steel.
[0010] As a further implementation, the support mesh is woven from corrosion-resistant metal material or from fluoroplastic-coated metal composite wire, and the mesh aperture of the support mesh is larger than the outer diameter of the fluoroplastic heat exchange tube.
[0011] As a further implementation, the multiple fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer are arranged in parallel with each other; the multiple fluoroplastic heat exchange tubes of the second fluoroplastic heat exchange tube bundle layer are also arranged in parallel with each other.
[0012] As a further implementation, the corrosion-resistant metal material is 316L stainless steel or titanium alloy.
[0013] As a further implementation, the included angle between the fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer and the second fluoroplastic heat exchange tube bundle layer in the horizontal plane is 60°-90°.
[0014] As a further implementation, a control unit is also included, which is connected to the upper spray layer and is used to control the upper spray layer to open intermittently according to a preset time interval or the pressure difference or temperature of the condensation collection unit monitored in real time.
[0015] Secondly, the present invention also provides a method for operating a flue gas purification CPM device based on dual spraying and condensation capture, comprising the following steps: Step 1: Flue gas enters the tower and is sprayed by the lower spray layer to make the flue gas saturated or supersaturated. Step 2: The saturated flue gas rises and passes through the first fluoroplastic heat exchange tube bundle layer, through the support mesh, and then through the second fluoroplastic heat exchange tube bundle layer in sequence. Water vapor and gaseous CPM in the flue gas condense on the surface of the fluoroplastic heat exchange tubes at a temperature lower than the dew point, forming CPM-containing condensate droplets. Step 3: The upper spray layer is intermittently activated by the control unit to spray cleaning fluid. The cleaning fluid sequentially washes the first direction tube bundle, passes through the support mesh, and is then evenly distributed to the second direction tube bundle, peeling off and washing away the scale layer attached to the surface of the tube bundle. Step 4: The purified flue gas is discharged after the entrained liquid droplets are removed by the demister. The demister adopts a multi-layer gradient metal wire mesh structure, with the mesh number gradually increasing from bottom to top to achieve gradient filtration from coarse to fine.
[0016] Compared with the prior art, the advantages and positive effects of this invention are: In this invention, the lower spray layer is positioned above the flue gas inlet at the bottom of the tower body, and the condensation collection unit is positioned above the lower spray layer. The condensation collection unit includes a support mesh, a first fluoroplastic heat exchange tube bundle layer, and a second fluoroplastic heat exchange tube bundle layer. The first fluoroplastic heat exchange tube bundle layer is placed on top of the support mesh and rests on the support mesh solely by gravity. It can slide freely during thermal expansion, eliminating the need for complex thermal stress compensation mechanisms and fundamentally preventing thermal stress damage. The second fluoroplastic heat exchange tube bundle layer is arranged below the support mesh via heat exchange tube supports. The support mesh acts as an isolation layer, preventing direct contact and friction between the upper and lower tube bundle layers. Simultaneously, the tube bundle and the support... The meshes are in static contact with each other, eliminating relative friction and completely solving the wear problem of the fluoroplastic tubes. The fluoroplastic heat exchange tubes in the first and second fluoroplastic heat exchange tube bundles are arranged at a set angle to each other in the horizontal plane, forcing a change in the flow direction of the flue gas and significantly enhancing heat transfer. The staggered arrangement of the fluoroplastic heat exchange tubes reduces the particle deposition rate. The upper spray layer is arranged above the condensation and collection unit, with its spray direction facing the condensation and collection unit, and is used to spray cleaning liquid onto the surface of the support mesh and the fluoroplastic heat exchange tube bundles on the upper and lower sides. During cleaning, the support mesh acts as a guide plate, ensuring that the cleaning liquid from the upper spray layer is evenly distributed to all areas of the upper and lower tube bundles. The cleaning liquid first flushes the upper tube bundle, then disperses and falls after passing through the mesh, ensuring that the lower tube bundle is also thoroughly rinsed. Attached Figure Description
[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0018] Figure 1 This is a schematic diagram of the overall structure of the flue gas purification CPM device of the present invention; Figure 2 For the present invention Figure 1 Sectional view along line A; Figure 3 This is a structural diagram of the condensation trapping unit of the present invention; Figure 4 This is a diagram of the first layer of the wire mesh structure of the present invention; Figure 5 This is a diagram of the second layer of the wire mesh structure of the present invention; Figure 6 This is a diagram of the third layer of the wire mesh structure of the present invention.
[0019] In the diagram: 1. Tower body; 2. Flue gas inlet; 3. Lower spray layer; 4. Condensation and collection unit; 41. Support mesh; 42. First fluoroplastic heat exchanger tube bundle layer; 43. Second fluoroplastic heat exchanger tube bundle layer; 44. Heat exchanger tube support; 5. Upper spray layer; 6. Demister; 61. First layer of wire mesh; 62. Second layer of wire mesh; 63. Third layer of wire mesh; 7. Flue gas outlet; 8. Cooling medium inlet; 9. Cooling medium outlet; 10. Control unit. Detailed Implementation
[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Example 1 This embodiment provides a flue gas purification CPM device based on dual spraying and condensation capture, such as... Figures 1-6As shown, the structure includes: a tower body 1, inside which, from bottom to top along the flue gas flow direction, are arranged a lower spray layer 3, a condensation collection unit 4, an upper spray layer 5, and a demister 6; the lower spray layer 3 is located above the flue gas inlet 2 at the bottom of the tower body 1, and the condensation collection unit 4 is located above the lower spray layer 3. The condensation collection unit 4 includes a support net 41, a first fluoroplastic heat exchange tube bundle layer 42, and a second fluoroplastic heat exchange tube bundle layer 43. The support net 41 is horizontally fixed to the inner wall of the tower body 1. The first fluoroplastic heat exchange tube bundle layer 42 is placed on the upper part of the support net 41. The first fluoroplastic heat exchange tube bundle layer 42 is supported on the support net 41 by gravity alone and can slide freely during thermal expansion, eliminating the need for a complex thermal stress compensation mechanism and fundamentally avoiding thermal stress damage. The second fluoroplastic heat exchange tube bundle layer 43 is arranged below the support net 41 through a heat exchange tube support 44. The support net 41 serves as... As an isolation layer, direct contact and friction between the upper and lower tube bundles are eliminated; at the same time, the tube bundles and the support net 41 are in static contact, with no relative frictional movement, which completely solves the wear problem of fluoroplastic tubes; the first fluoroplastic heat exchange tube bundle layer 42 and the second fluoroplastic heat exchange tube bundle layer 43 are both composed of multiple fluoroplastic heat exchange tubes. The fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer 42 and the second fluoroplastic heat exchange tube bundle layer 43 are arranged at a set angle to each other in the horizontal plane, which forces the flow direction of flue gas to change, significantly enhancing heat transfer. The staggered arrangement of fluoroplastic heat exchange tubes can reduce the particle deposition rate; the upper spray layer 5 is arranged above the condensation and collection unit 4, and its spraying direction is towards the condensation and collection unit 4, used to spray cleaning liquid onto the support net 41 and the surface of the fluoroplastic heat exchange tube bundles on the upper and lower sides; during cleaning, the support net 41 acts as a guide plate, so that the cleaning liquid of the upper spray layer 5 is evenly distributed to all areas of the upper and lower tube bundles. The cleaning fluid first flushes the upper tube bundle, then disperses and falls through the mesh, ensuring that the lower tube bundle is also thoroughly rinsed. The demister 6 is positioned above the upper spray layer 5 to efficiently capture tiny droplets. The demister 6 adopts a detachable drawer-type installation structure for easy periodic inspection and maintenance. Each layer of wire mesh can be independently removed and replaced, improving the maintainability of the equipment. A flue gas outlet 7 is provided at the top of the tower body 1.
[0022] The support mesh 41 has tiny protrusions at the intersections of its mesh openings. These protrusions create point contact between the tube bundle and the support mesh, further reducing the contact area and lowering potential frictional resistance, while also providing a smoother flow path for the cleaning fluid.
[0023] As a further implementation, the demister 6 is a multi-layer gradient metal wire mesh structure. This structure includes at least two layers of metal wire mesh with different mesh counts arranged sequentially from bottom to top, with the lower layer having a smaller mesh count than the upper layer, forming a gradient filtration structure from coarse to fine. The demister 6 comprises three layers of metal wire mesh, arranged sequentially from bottom to top: the first layer 61 is an 80-100 mesh metal wire mesh used to intercept large droplets and uniformly distribute the airflow; the second layer 62 is a 120 mesh metal wire mesh used to capture droplets of uniform size; and the third layer 63 is a 150 mesh metal wire mesh, thereby improving the efficiency of capturing small droplets. The gradient structure allows the airflow to enter from a large aperture and gradually transition to a smaller aperture. Compared to directly using a high-mesh wire mesh, this structure disperses and rectifies the gas before it enters the dense layer, preventing the airflow from concentrating and impacting a specific area. Because droplets are captured in layers, the liquid film distribution inside the mesh is more uniform, preventing the formation of localized liquid seals or accumulation. This maintains a low pressure drop during long-term operation, helping to reduce the energy consumption of the fan or compressor. Tests have shown that the collection efficiency for droplets larger than 3μm can reach over 99%, with the pressure drop controlled within 300-500Pa.
[0024] As a further implementation, the wire mesh is made of corrosion-resistant stainless steel, specifically 304 or 316L stainless steel, to adapt to the corrosive environment of the flue gas.
[0025] As a further implementation, the support mesh 41 is woven from corrosion-resistant metal material or from fluoroplastic-coated metal composite wire. The mesh size of the support mesh 41 is larger than the outer diameter of the fluoroplastic heat exchange tube. By setting the mesh size of the support mesh 41 to be larger than the outer diameter of the fluoroplastic heat exchange tube, the position of the fluoroplastic heat exchange tube is no longer restricted, thereby automatically realizing thermal stress compensation and solving the problem of heat exchange tube damage due to thermal stress caused by the existing mesh size matching the tube diameter.
[0026] As a further implementation, the multiple fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer 42 are arranged in parallel with each other; the multiple fluoroplastic heat exchange tubes of the second fluoroplastic heat exchange tube bundle layer 43 are also arranged in parallel with each other; a cooling medium is circulated inside the fluoroplastic heat exchange tubes to provide a condensation interface below the flue gas dew point temperature. By forcing the condensation of gaseous CPM through a large-area low-temperature interface, the gaseous pollutants are converted and captured into a liquid state, significantly reducing flue gas CPM emissions.
[0027] As a further implementation, the corrosion-resistant metal material is 316L stainless steel or titanium alloy, in order to balance corrosion resistance and structural strength.
[0028] As a further implementation, the included angle between the fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer 42 and the second fluoroplastic heat exchange tube bundle layer 43 in the horizontal plane is 60°-90°; the cooling medium inlet 8 and the cooling medium outlet 9 of the first fluoroplastic heat exchange tube bundle layer 42 and the second fluoroplastic heat exchange tube bundle layer 43 are arranged opposite to each other.
[0029] As a further implementation, a control unit 10 is also included, which is connected to the upper spray layer 5 and is used to control the upper spray layer 5 to open intermittently according to a preset time interval or the pressure difference or temperature of the condensation collection unit 4 monitored in real time.
[0030] Example 2 This embodiment provides a working method for a flue gas purification CPM device based on dual spraying and condensation capture, including the following steps: Step 1: Flue gas enters tower body 1 and is sprayed by the lower spray layer 3 to make the flue gas saturated or supersaturated. Step 2: The saturated flue gas rises and passes through the first fluoroplastic heat exchange tube bundle layer 42, through the support net 41, and then through the second fluoroplastic heat exchange tube bundle layer 43. Water vapor and gaseous CPM in the flue gas condense on the surface of the fluoroplastic heat exchange tubes at a temperature lower than the dew point, forming CPM-containing condensate droplets. Step 3: The upper spray layer 5 is intermittently turned on by the control unit 10 to spray cleaning liquid. The cleaning liquid sequentially washes the first direction tube bundle, passes through the support net 41, and is then evenly distributed to the second direction tube bundle, peeling off and washing away the scale layer attached to the surface of the tube bundle. Step 4: The purified flue gas is discharged after the entrained liquid droplets are removed by the demister 6. The demister 6 adopts a multi-layer gradient metal wire mesh structure, with the mesh number gradually increasing from bottom to top to achieve gradient filtration from coarse to fine.
[0031] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.
Claims
1. A flue gas purification CPM device based on dual spraying and condensation capture, characterized in that, include: The tower body has, from bottom to top, a lower spray layer, a condensation collection unit, an upper spray layer, and a demister arranged sequentially along the flue gas flow direction. The lower spray layer is located above the flue gas inlet at the bottom of the tower body. The condensation collection unit is located above the lower spray layer and includes a support mesh, a first fluoroplastic heat exchange tube bundle layer, and a second fluoroplastic heat exchange tube bundle layer. The support mesh is horizontally fixed to the inner wall of the tower body. The first fluoroplastic heat exchange tube bundle layer is placed on top of the support mesh, and the second fluoroplastic heat exchange tube bundle layer is arranged below the support mesh. Both the first and second fluoroplastic heat exchange tube bundle layers consist of multiple fluoroplastic heat exchange tubes arranged at a predetermined angle to each other in the horizontal plane. The upper spray layer is located above the condensation collection unit, with its spray direction facing the condensation collection unit. The demister is located above the upper spray layer.
2. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 1, characterized in that, The demister is a multi-layer gradient metal wire mesh structure, which includes at least two layers of metal wire mesh with different mesh counts arranged sequentially from bottom to top, with the mesh count of the lower layer being smaller than that of the upper layer, forming a gradient filtration structure from coarse to fine.
3. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 2, characterized in that, The demister comprises three layers of metal wire mesh, from bottom to top: the first layer is an 80-100 mesh metal wire mesh, used to intercept large droplets and uniformly distribute airflow; the second layer is a 120 mesh metal wire mesh, used to capture medium-sized droplets; and the third layer is a 150 mesh metal wire mesh, used to efficiently capture tiny droplets.
4. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 3, characterized in that, The metal wire mesh is made of corrosion-resistant stainless steel, specifically 304 or 316L stainless steel.
5. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 1, characterized in that, The support mesh is woven from corrosion-resistant metal materials or from fluoroplastic-coated metal composite wires, and the mesh aperture of the support mesh is larger than the outer diameter of the fluoroplastic heat exchange tube.
6. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 5, characterized in that, The multiple fluoroplastic heat exchange tubes in the first fluoroplastic heat exchange tube bundle layer are arranged in parallel with each other; the multiple fluoroplastic heat exchange tubes in the second fluoroplastic heat exchange tube bundle layer are also arranged in parallel with each other.
7. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 5, characterized in that, The corrosion-resistant metal material is 316L stainless steel or titanium alloy.
8. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 1, characterized in that, The angle between the fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer and the second fluoroplastic heat exchange tube bundle layer in the horizontal plane ranges from 60° to 90°.
9. The flue gas purification CPM device based on dual spraying and condensation capture as described in claim 1, characterized in that, It also includes a control unit, which is connected to the upper spray layer and is used to control the upper spray layer to open intermittently according to a preset time interval or the pressure difference or temperature of the condensation collection unit monitored in real time.
10. The operating method of a flue gas purification CPM device based on dual spraying and condensation capture as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Flue gas enters the tower and is sprayed by the lower spray layer to make the flue gas saturated or supersaturated. Step 2: The saturated flue gas rises and passes through the first fluoroplastic heat exchange tube bundle layer, through the support mesh, and then through the second fluoroplastic heat exchange tube bundle layer in sequence. Water vapor and gaseous CPM in the flue gas condense on the surface of the fluoroplastic heat exchange tubes at a temperature lower than the dew point, forming CPM-containing condensate droplets. Step 3: The upper spray layer is intermittently activated by the control unit to spray cleaning fluid. The cleaning fluid sequentially washes the first direction tube bundle, passes through the support mesh, and is then evenly distributed to the second direction tube bundle, peeling off and washing away the scale layer attached to the surface of the tube bundle. Step 4: The purified flue gas is discharged after the entrained liquid droplets are removed by the demister. The demister adopts a multi-layer gradient metal wire mesh structure, with the mesh number gradually increasing from bottom to top to achieve gradient filtration from coarse to fine.