Boiler flue and flue improvement method

Abstract

The invention relates to the technical field of flues, in particular to a boiler flue and a flue improvement method.The boiler flue comprises a plurality of flues with circular cross sections; the elbow device comprises at least one section of bent part, the diameter of the flue connected with the bent part is D, and the ratio of the curvature radius R of the bent part to the diameter D of the flue meets the condition that R is larger than or equal to 1.5 D; the elbow device further comprises a lining layer, and the lining layer covers the inner surface of the elbow device. The elbow device has the advantages that the elbow device with the circular cross section and the large curvature radius remarkably reduces pressure loss and turbulence in the fluid flowing process, and the energy efficiency of a system is improved. The design follows the fluid mechanics principle, so that fluid can pass through the elbow more smoothly, kinetic energy loss is reduced, and energy is saved. Due to the streamline design in the elbow device and the application of the lining layer, the friction loss between the fluid and the pipe wall is further reduced, and the local resistance coefficient is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flues, in particular to a boiler flue and a flue improvement method. Background Art

[0002] As the country's requirements for environmental protection continue to increase, more and more attention has been paid to the control of pollutant emissions in industrial production. Especially for high-pollution industries such as thermal power, steel, and chemicals, achieving ultra-low emissions has become an inevitable requirement for the sustainable development of enterprises. In these industries, the flue gas treatment system is one of the key facilities to achieve ultra-low emissions, and its performance directly affects the removal efficiency of pollutants and the environmental protection compliance of enterprises.

[0003] In the flue gas treatment system, the design of the flue is crucial. It not only affects the smoothness of the flue gas flow, but is also directly related to the energy consumption and operating cost of the entire system. Traditional flue designs mostly use square or rectangular cross-sections. Although they have certain advantages in space utilization, they have obvious deficiencies in fluid mechanics performance. For example, the vortex and local resistance inside the square flue are large, which can easily cause an increase in pressure drop, thereby affecting the overall efficiency and energy consumption of the system. Summary of the invention

[0004] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] The object of the present invention is to provide a boiler flue.

[0006] Therefore, its purpose is to solve the problem that the vortex and local resistance inside the square flue are large, which easily causes an increase in pressure drop and further affects the overall efficiency and energy consumption of the system.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a boiler flue, comprising a plurality of flues with circular cross-sections; at least one elbow device, the elbow device comprising at least one curved portion, the flue diameter connected to the curved portion being D, wherein the ratio of the curvature radius R of the curved portion to the flue diameter D satisfies R≥1.5D; the elbow device also comprises an inner lining layer, and the inner lining layer covers the inner surface of the elbow device.

[0008] As a preferred solution of a boiler flue of the present invention, the curved portion of the elbow device adopts a streamlined design, and the inner surface of the flue is smoothed.

[0009] As a preferred solution of a boiler flue of the present invention, the elbow device further comprises one or more reinforcing ribs, which are arranged inside or outside the elbow device.

[0010] As a preferred solution of a boiler flue of the present invention, the outer surface of the flue is coated with an anti-stick coating.

[0011] As a preferred solution of a boiler flue of the present invention, the spiral guide vane is arranged at the inlet of the elbow device, and the spiral angle α of the spiral guide vane ranges from 10° to 45°.

[0012] As a preferred solution of a boiler flue of the present invention, the spiral guide vane is made of stainless steel, nickel-based alloy or carbon fiber reinforced plastic.

[0013] As a preferred solution of a boiler flue of the present invention, the inner lining layer comprises:

[0014] The base layer is in direct contact with the metal wall surface of the elbow device; the middle layer is made of a material with high thermal conductivity; and the surface layer is made of a high-temperature resistant ceramic material or a metal alloy material with a low friction coefficient.

[0015] As a preferred solution of a boiler flue of the present invention, a plurality of flues are interconnected to form a continuous fluid channel.

[0016] As a preferred solution of a boiler flue of the present invention, the flue and the elbow device are connected by welding, flange or other mechanical connection methods.

[0017] In order to solve the above technical problems, the present invention also provides the following technical solutions: a boiler flue and a flue improvement method, comprising a boiler flue, and,

[0018] The flue has a circular cross-section; an elbow device is arranged in the flue, and the ratio of the curvature radius R of the elbow device to the flue diameter D satisfies R≥1.5D; the curved part of the elbow device adopts a streamlined design; a spiral guide vane is installed at the inlet of the elbow device to optimize the fluid flow path.

[0019] The beneficial effects of the present invention are as follows: the elbow device with a circular cross section and a large radius of curvature significantly reduces the pressure loss and turbulence in the fluid flow process, and improves the energy efficiency of the system. This design follows the principles of fluid mechanics, allowing the fluid to pass through the elbow more smoothly, reducing kinetic energy loss, thereby saving energy.

[0020] The streamlined design inside the elbow device and the application of the inner lining further reduce the friction loss between the fluid and the pipe wall and lower the local resistance coefficient.

[0021] The introduction of spiral guide vanes reduces turbulence by optimizing the flow path of the fluid, further improving the operating efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 It is a schematic diagram of a top view of a partial cross-section structure in the present invention.

[0025] Figure 3 It is a schematic diagram of the rectangular pipe fluid dynamics simulation in the present invention.

[0026] Figure 4 It is a schematic diagram of fluid dynamics simulation of the circular elbow device in the present invention.

[0027] In the figure:

[0028] 100. Flue; 101. Elbow device; 102. Inner lining; 103. Spiral guide vane. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figure 1-4, which is the first embodiment of the present invention, provides a boiler flue, including a plurality of flues 100 with circular cross-sections; at least one elbow device 101, the elbow device 101 includes at least one curved portion, the flue 100 connected to the curved portion has a diameter D, wherein the ratio of the radius of curvature R of the curved portion to the diameter D of the flue 100 satisfies R≥1.5D, thereby ensuring that the fluid can turn smoothly when passing through the elbow, effectively reducing the energy loss caused by the sharp turn; the elbow device 101 also includes an inner lining 102, which covers the inner surface of the elbow device 101 to reduce friction loss. The curved portion of the elbow device 101 adopts a streamlined design to optimize the flow characteristics of the airflow when passing through and reduce local resistance loss; the inner surface of the elbow device 101 is smoothed to reduce friction loss and further reduce the total pressure loss of the system. Multiple flues 100 are connected to each other to form a continuous fluid channel. The connection between the flue 100 and the elbow device 101 adopts welding, flange or other mechanical connection methods to ensure the sealing and structural strength of the connection part.

[0034] In this embodiment, the boiler flue 100 is generally composed of multiple sections, each of which has a circular cross section. Such a design helps to maintain the uniformity of fluid flow and reduce the generation of turbulence. The circular cross section can provide better flow characteristics and lower pressure loss than other shapes, because the circular cross section can minimize boundary layer separation, thereby reducing flow resistance.

[0035] In the flue 100, the elbow device 101 is used to change the flow direction of the fluid. The elbow device 101 in this design includes at least one curved portion, and the diameter of the connection between the flue 100 and the curved portion is D. In order to ensure that the fluid can turn smoothly when passing through the elbow, the ratio of the curvature radius R of the elbow to the diameter D of the flue 100 satisfies R≥1.5D. The selection of this design parameter is based on the principle of fluid mechanics, that is, a larger curvature radius helps to reduce the kinetic energy loss caused by sharp turns, and can also reduce the local resistance coefficient, thereby reducing the energy loss of the entire system.

[0036] like Figure 3-4, shows the results of a fluid dynamics simulation of a traditional rectangular pipe and a circular elbow device 101, which is used to simulate the flow of fluid in a specific geometric shape. Specifically, when the fluid passes through the elbow, due to inertia, the fluid tends to move along the original path, which will cause a low-pressure area, the so-called "wake area", to form on the outside of the bend. The design of the circular elbow can guide the fluid to turn more smoothly, thereby reducing the formation of these low-speed wake areas and improving the efficiency of fluid transmission. At the corners of the rectangular pipe, eddies are easily generated due to the boundary layer separation phenomenon. These eddies not only consume energy, but may also cause problems such as pipeline vibration. The circular elbow, through its gentler curvature, helps to reduce the separation of the boundary layer, thereby reducing the formation of eddies, reducing energy losses, and improving the stability and efficiency of the system. The circular elbow can make the fluid more evenly distributed during the turning process, avoiding problems such as increased wear or sediment accumulation caused by excessively high or low local flow velocities, helping to extend the service life of the pipeline and maintain good fluid transmission performance. Compared with pipes with right angles or sharp angles, round elbows can effectively reduce the pressure loss when the fluid passes through. This is because the smooth transition reduces the friction resistance between the fluid and the pipe wall, and also reduces the turbulence inside the fluid.

[0037] The elbow device 101 has an inner lining layer 102, which covers the inner surface of the elbow and mainly functions to reduce the friction loss between the fluid and the pipe wall.

[0038] The curved portion of the elbow device 101 is streamlined in design to optimize the flow characteristics of the airflow. The streamlined design can reduce the vortex formed by the fluid at the bend, reduce the local resistance loss, and thus reduce the pressure drop in the entire system. In addition, the inner surface of the flue 100 is smoothed to reduce the friction between the fluid and the tube wall and further reduce the total pressure loss of the system. The smoothing can be achieved by processes such as polishing and coating.

[0039] Multiple flue 100 sections are connected through elbow devices 101 to form a continuous fluid channel. The connection between the flue 100 and the elbow device 101 can be achieved by welding, flange connection or other mechanical connection methods. Welding connection can provide good sealing performance and high structural strength, but installation and maintenance are more complicated; flange connection is easy to disassemble and repair, but special gasket materials may need to be used under high temperature conditions to ensure the sealing effect. Other mechanical connection methods, such as ferrule connection, also have their own advantages and disadvantages, and need to be selected according to specific working conditions and requirements.

[0040] The elbow device 101 also includes one or more reinforcing ribs arranged inside or outside the elbow portion to enhance the structural strength and prevent deformation. The outer surface of the flue 100 is coated with an anti-stick coating to reduce dust accumulation and corrosion and extend the service life.

[0041] In this embodiment, under high pressure or high temperature conditions, the elbow device 101 may creep or plastically deform, especially the elbow part is more susceptible to the influence due to its shape. The reinforcing ribs effectively disperse stress and reduce the risk of deformation by increasing the local thickness or forming a grid-like structure. The reinforcing ribs can significantly improve the overall stiffness of the elbow, especially when subjected to impact loads or vibrations.

[0042] In the flue 100 system, dust accumulation will lead to reduced heat transfer efficiency and increased energy consumption. Anti-stick coating can reduce the adhesion of dust particles, thereby maintaining good heat transfer performance. Regular cleaning of dust accumulation is a time-consuming and costly task. After using anti-stick coating, the amount of dust accumulation is reduced, and the corresponding cleaning frequency and intensity are also reduced, saving maintenance costs.

[0043] Example 2

[0044] Reference Figure 1-2 , which is the second embodiment of the present invention, provides a boiler flue, a spiral guide vane 103, which is arranged at the entrance of the elbow device 101, and its spiral angle α is optimized according to the fluid properties and flow rate to guide the fluid to flow smoothly along a predetermined path and reduce the occurrence of turbulence. The spiral angle α of the spiral guide vane 103 ranges from 10° to 45°, and the specific value is determined according to the fluid type and flow rate to achieve the best guide effect. The spiral guide vane 103 is made of corrosion-resistant material, specifically stainless steel, nickel-based alloy or carbon fiber reinforced plastic, and is suitable for a variety of harsh working environments.

[0045] In this embodiment, the spiral guide plate 103 is a component installed at the entrance of the elbow device 101 of the boiler flue 100. Its main function is to reduce the turbulence caused by the fluid turning by optimizing the flow path of the fluid. When the fluid (such as flue gas) enters the flue 100 elbow, turbulence is easily generated due to the sudden change in direction, resulting in increased energy loss and aggravated wear of the inner wall of the pipe. The spiral guide plate 103 can effectively guide the fluid to flow smoothly along the preset path through its unique spiral structure, reducing the friction between the fluid and the inner wall of the pipe.

[0046] The spiral angle α of the spiral guide plate 103 is one of the parameters that determine its flow guiding effect. The range of the spiral angle α is set between 10° and 45°. The selection of this range is based on a comprehensive consideration of different fluid properties (such as viscosity, density, etc.) and flow rates. For example, under low flow rates, a smaller spiral angle may be more conducive to maintaining a stable flow of the fluid; while under high flow conditions, a larger spiral angle may be required to better control the flow direction of the fluid and avoid excessive turbulence. Therefore, in practical applications, the most suitable spiral angle value should be determined according to specific working conditions through experimental tests or computational simulations to achieve the best flow guiding effect.

[0047] Example 3

[0048] Reference Figure 1-2 , which is the third embodiment of the present invention, provides a boiler flue, and the inner lining layer 102 is a multi-layer composite structure, including: a base layer: directly in contact with the metal wall surface of the elbow device 101, and made of a high-strength, corrosion-resistant metal material to ensure the close combination of the inner lining layer 102 and the elbow device 101; an intermediate layer: made of a material with high thermal conductivity to promote heat transfer from the fluid to the outer wall of the elbow device 101, thereby improving the overall thermal efficiency; a surface layer: made of a high-temperature resistant ceramic material or a metal alloy material with a low friction coefficient to minimize friction losses during fluid flow.

[0049] In this embodiment, the base layer is a layer directly in contact with the metal wall surface inside the boiler flue 100, and its main function is to ensure that the lining layer 102 can be firmly attached to the flue 100 wall, and at the same time provide sufficient mechanical strength to resist the impact of high temperature and high-speed airflow. Commonly used materials include stainless steel, nickel-based alloys, etc. These materials not only have excellent corrosion resistance, but also can maintain good mechanical properties in high temperature environments.

[0050] The main purpose of the middle layer is to improve the efficiency of heat transfer, so the selected material should have excellent thermal conductivity. Common high thermal conductivity materials include copper, aluminum and their alloys, as well as some non-metallic materials such as graphene. The thermal conductivity of these materials is much higher than that of ordinary metals, which can significantly speed up the transfer of heat from the flue gas to the outer wall of the flue 100. Efficient heat conduction can ensure that the temperature distribution inside the flue 100 is more uniform, avoiding local overheating, uneven flow velocity distribution, and affecting the overall flow efficiency.

[0051] The surface layer is in direct contact with high-temperature flue gas, so it must have extremely high heat resistance and wear resistance, and also have a low friction coefficient to reduce energy loss during fluid flow. Commonly used materials include ceramic materials such as silicon carbide and silicon nitride, or special high-temperature resistant alloy steel. These materials are not only stable at high temperatures, but also have smooth surfaces and are not prone to dust accumulation, which is conducive to improving the smoothness of flue gas flow.

[0052] A boiler flue and a flue improvement method, wherein each section of the flue 100 is designed to have a circular cross-section to promote uniform flow of the fluid, reduce turbulence, and reduce pressure loss. The ratio of the radius of curvature R of the elbow to the diameter D of the flue 100 satisfies R≥1.5D, which can reduce the kinetic energy loss caused by sharp turns, reduce the local resistance coefficient, and thus reduce the energy loss in the system. The curved portion of the elbow device 101 adopts a streamlined design to reduce vortex formation, reduce local resistance loss, and reduce system pressure drop. The flue 100 and the elbow device 101 can be connected by welding, flange connection or other mechanical connection methods. A spiral guide vane 103 is installed at the inlet of the elbow device 101 to optimize the fluid flow path, reduce turbulence, and improve flow efficiency.

[0053] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0054] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0055] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A boiler flue, characterized in that: include, A plurality of flues (100) having circular cross-sections; At least one elbow device (101), the elbow device (101) comprising at least one curved portion, the flue (100) connected to the curved portion having a diameter D, wherein a ratio of a radius of curvature R of the curved portion to the diameter D of the flue (100) satisfies R≥1.5D; The elbow device (101) further comprises an inner lining layer (102), wherein the inner lining layer (102) covers the inner surface of the elbow device (101).

2. A boiler flue as claimed in claim 1, characterized in that: The curved portion of the elbow device (101) is streamlined in design, and the inner surface of the flue (100) is smoothed.

3. A boiler flue as claimed in claim 2, characterized in that: The elbow device (101) further comprises one or more reinforcing ribs, which are arranged inside or outside the elbow device (101).

4. A boiler flue as claimed in claim 3, characterized in that: The outer surface of the flue (100) is coated with an anti-stick coating.

5. A boiler flue as claimed in claim 1, characterized in that: The spiral guide vane (103) is arranged at the entrance of the elbow device (101), and the spiral angle α of the spiral guide vane (103) ranges from 10° to 45°.

6. A boiler flue as claimed in claim 5, characterized in that: The spiral guide vane (103) is made of stainless steel, nickel-based alloy or carbon fiber reinforced plastic.

7. A boiler flue as claimed in claim 6, characterized in that: The lining layer (102) comprises: The base layer is in direct contact with the metal wall surface of the elbow device (101); the middle layer is made of a material with high thermal conductivity; and the surface layer is made of a high-temperature resistant ceramic material or a metal alloy material with a low friction coefficient.

8. A boiler flue as claimed in claim 1, characterized in that: A plurality of flues (100) are interconnected to form a continuous fluid channel.

9. A boiler flue as claimed in claim 8, characterized in that: The connection between the flue (100) and the elbow device (101) is achieved by welding, flange or other mechanical connection methods.

10. A boiler flue and a flue improvement method, characterized in that: A boiler flue comprising any one of claims 1 to 9, and The flue (100) has a circular cross section; An elbow device (101) is provided in the flue (100), and the ratio of the curvature radius R of the elbow device (101) to the diameter D of the flue (100) satisfies R≥1.5D; The curved portion of the elbow device (101) adopts a streamlined design; A spiral guide vane (103) is installed at the inlet of the elbow device (101) to optimize the fluid flow path.

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