A two-stage u-shaped filter duct system for high temperature air dedusting

Abstract

The application discloses a two-stage U-shaped filter pipeline system for high-temperature air dust removal, which is a pipeline combined and connected by a plurality of different pipe sections, and a cylindrical heat preservation inner container is arranged in the shell of the pipeline; the inner diameter channel of the heat preservation inner container is a gas flow channel; the heat preservation inner container is sequentially wrapped by four annular layers, and the four layers are, from inside to outside, corundum ceramic layer, zirconium oxide ceramic layer, refractory felt layer and aerogel heat insulation layer; the plurality of different pipe sections include a basic flow channel section and a U-shaped filter section capable of changing the gas flow direction by 180 degrees; the pipeline system is designed in a modular manner, the flow channel structure, length and filter section quantity can be adjusted and changed to adapt to different experimental environments, the production and processing cost is reduced, an adjustable filter flow channel design is provided, the overall structure is simple, the temperature resistance is good, the heat preservation performance is strong, the filtration efficiency is high, and the pipeline system can meet the dust removal and filtration of high-temperature air and gas above 1600K.

Description

Technical Field

[0001] This invention belongs to the field of air dust removal and filtration technology, specifically, it relates to a two-stage U-shaped filtration pipeline system for high-temperature air dust removal. Background Technology

[0002] In daily production experiments, different dust removal and filtration equipment is needed to treat common gases such as fuel gas, exhaust gas, and air to facilitate subsequent experiments or waste gas recovery. Common dust removal and filtration methods include electrostatic filtration, gravity settling, and inertial separation. Inertial dust removal utilizes the difference in inertial forces between dust particles and gas. An obstacle is placed in front of the dust-laden airflow, causing a sharp change in airflow direction. Because the inertial force of the dust particles is much greater than that of the gas, the dust particles are separated from the airflow, and the purified gas is discharged after the sharp change in direction.

[0003] In experiments involving the dynamic characteristics of high-temperature air and fuel gas, the gas temperature is extremely high, reaching over 1600K. At this temperature, the filtration and dust removal devices within the pipeline face significant limitations. Firstly, after being heated in the electric heater, the gas carries a large amount of dust and impurities into the flow channel, requiring enhanced dust removal and filtration devices to remove these impurities and prevent them from affecting the experiment. Secondly, conventional pipeline layouts and filtration devices cannot withstand temperatures above 1600K, making them highly susceptible to ablation. Currently, common dust removal equipment for high-temperature dust removal needs both domestically and internationally includes cyclone dust collectors, high-temperature electrostatic precipitators, and rigid ceramic filters, but all have limitations such as low filtration efficiency and a maximum temperature resistance of only around 800K. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of existing filtration technology and the design of filtration devices in common experimental systems, to solve the limitations caused by high temperature environment and high impurity rate in high temperature air filtration and dust removal technology, and to support high temperature air thermal characteristic experiments. This invention provides a two-stage U-shaped filtration pipeline system for high temperature air dust removal, which modifies the gas flow channel and is arranged between the heater and the experimental section to solve the problems of existing dust removal and filtration methods being single, having poor temperature resistance, and low filtration efficiency.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A two-stage U-shaped filtration pipeline system for high-temperature air dust removal is disclosed. The pipeline system is composed of several different pipe sections connected together. A cylindrical heat-insulating inner liner is installed inside the outer shell of the pipeline. The inner diameter channel of the heat-insulating inner liner is a gas flow channel. The heat-insulating inner liner is composed of four layers in a ring shape wrapped in sequence. The four layers are, from the inside to the outside, a corundum ceramic layer, a zirconia ceramic layer, a refractory felt layer, and an aerogel insulation layer.

[0007] Several different pipe sections include a basic flow channel section and a U-shaped filter section that can change the gas flow direction by 180°. The basic flow channel section is cylindrical and there are several of them. There are at least two U-shaped filter sections, and when the gas flows between two U-shaped filter sections, the gas flow direction changes by at least two 90°.

[0008] The main body of the pipe of this invention includes an outermost 304 stainless steel shell and an inner insulated liner. The interior of the liner is a gas flow channel through which gas flows. The insulated liner mainly consists of four layers arranged in sequence with different materials, totaling four layers. From the inside out, they are a corundum ceramic layer, a zirconia ceramic layer, a refractory felt layer, and an aerogel insulation layer. Each insulation layer is in close contact and nested layer by layer. A boss is provided at the port to increase the airtightness of the flow channel.

[0009] The innermost layer is a corundum ceramic insulation layer. Corundum ceramic has good temperature resistance but poor insulation performance. The second layer from the inside is a zirconia ceramic layer. Zirconia ceramic has a temperature resistance limit of about 2500K and a low thermal conductivity, balancing temperature resistance and insulation. A layer of refractory felt is wrapped around the zirconia ceramic layer. The refractory felt has an extremely low thermal conductivity of about 0.032, providing excellent insulation. The outermost layer is an aerogel insulation material tightly attached to the 304 stainless steel shell, with a thermal conductivity of only 0.016. After insulation by the inner liner, the temperature of the outermost stainless steel layer is limited to below 400K, meeting experimental requirements.

[0010] The basic flow channel section is cylindrical and can be assembled in any number. The U-shaped filter section has a semi-enclosed section. After the gas enters, it will change the flow direction. The structural design of baffles, end caps, etc., as long as the gas flow direction is changed by 180°, the principle of inertial dust removal is used. The high-speed gas changes its flow direction after contacting the end caps and baffles, creating an inertial force difference that throws out impurities and dust, thus completing the filtration of impurities in high-temperature air.

[0011] Furthermore, the various pipe sections also include a T-junction connector, a dust collection cover, and a small filter section that can change the gas flow direction by 90°. The T-junction connector is T-shaped, and the dust collection cover has a dust collection chamber. The small filter section is composed of the T-junction connector and the dust collection cover. The basic flow channel section, U-shaped filter section, T-junction connector, small filter section, and dust collection cover are different modular pipe sections that can be interconnected and selected according to different requirements such as quantity and location. Here, the dust collection cover is a closed cover and also has a dust collection chamber for storing dust and impurities.

[0012] Furthermore, the U-shaped filter section is T-shaped, with one end of the straight section of the T-shape being open and the other end being sealed, and a dust collection cover connected to the T-shaped leg end.

[0013] Furthermore, the pipeline system is U-shaped, with several different pipe sections including two U-shaped filter sections and one small filter section. The small filter section is located between the two U-shaped filter sections. Gas enters the pipeline and flows out after successively changing direction by 180°, 90°, 90°, 180°, 90°, and 90°. (See attached diagram.) Figure 1-2 As shown, there are two U-shaped filter sections located in the upper left and lower right of the pipeline, as well as a single small filter section arranged in the lower left for auxiliary purposes. The ports of the two U-shaped filter sections and the small filter section are all dust storage chambers used to store micro dust impurities after inertial separation.

[0014] Furthermore, the outer diameter of the insulated inner liner is 250mm, the inner diameter is 100mm, and the total thickness of the insulation layer is 150mm.

[0015] During operation, high-temperature gas enters at a high velocity, flowing through the first dust removal point on the upper left. Within the enclosed port space, the high-temperature gas rapidly changes direction upon contact with the wall. At this point, dust and impurities within the gas are subjected to significant inertial force, detaching from the airflow and being thrown into the cavity. Under gravity, they settle at the bottom of the cavity, completing the first stage of dust removal filtration. Subsequently, the high-temperature air flows sequentially through the second and third dust removal points on the lower left and lower right, completing three stages of filtration before exiting the filtration section and entering the experimental section. The overall design and manufacturing adopt a modular approach, consisting of three different flow channel structures. Through modular design, the flow channel structure, length, and number of filtration sections can be adjusted and changed to adapt to different experimental environments.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0017] This invention, through modular design, allows for adjustments to the flow channel structure, length, and number of filter sections to adapt to different experimental environments, reducing production and processing costs. It provides an adjustable filter flow channel design with a simple overall structure, low material cost, and high cost-effectiveness. Moreover, it has good temperature resistance, strong heat insulation, and high filtration efficiency, meeting the requirements for dust removal and filtration of high-temperature air and gas above 1600K, supporting high-temperature air thermal characteristic experiments, and filling a gap in this field.

[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the planar structure of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 3 This is a cross-sectional schematic diagram of the pipeline of the present invention.

[0023] Figure 4 This is a schematic diagram of the basic flow channel section structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the three-way connector structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the U-shaped filter section structure of the present invention.

[0026] In the diagram: 1. First dust removal point; 2. Second dust removal point; 3. Third dust removal point; 4. Inlet; 5. Outlet; 6. Outer shell; 701. Corundum ceramic layer; 702. Zirconia ceramic layer; 703. Refractory felt layer; 704. Aerogel insulation layer; 801. Basic flow channel section; 802. U-shaped filter section; 803. T-junction connection section; 804. Dust collection cover; 805. Small filter section.

[0027] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0031] like Figures 1 to 6 As shown in this embodiment, a two-stage U-shaped filtration pipeline system for high-temperature air dust removal is described. This pipeline system is composed of several different pipe sections connected together. Each pipe section is a modular component. In this example, there are several pipe sections: a basic flow channel section 801, a U-shaped filter section 802, a T-joint connection section 803, a dust collection cover 804, and a small filter section 805. The small filter section 805 is composed of the T-joint connection section 803 and the dust collection cover 804. The modular pipe sections can be assembled and connected to each other.

[0032] See appendix Figure 1-2 Figure 4 illustrates the basic flow channel section 801, which has an outer diameter of 250mm, an inner diameter of 100mm, and a total insulation layer thickness of 150mm. Bosses are designed between the insulation layers to ensure sealing during pipe connections. When manufacturing and assembling the filter section, the length of the straight channel section can be arbitrarily changed by adding cylindrical basic flow channel structure modules, facilitating the layout of the experimental environment and site.

[0033] The 803 tee connector is shaped like an inverted T, see attached. Figure 1-2 As shown in Figure 5, the inner and outer diameters remain consistent with other structures. Other channels can be connected at the tee ports, or sealed with end caps or end caps. By changing the number and position of the tee ports, the overall flow direction and structure of the filter section can be freely altered.

[0034] U-shaped filter section 802, approximately T-shaped, see attached. Figure 1-2 As shown in Figure 5, the inner and outer diameters are consistent with those of the other structures, with an outer diameter of 250 mm and an inner diameter of 100 mm. One end of the filter section is connected to the other structures, while the other two ends are sealed, forming a structure that obstructs and deflects high-speed air, generating an inertial difference that throws out impurities, which are then collected in the dust removal chamber below.

[0035] Combined with appendix Figure 1-2As shown, the pipeline system is U-shaped, consisting of two U-shaped filter sections 802, three tee connection sections 803, one small filter section 805, several basic flow channel sections 801, two dust collection covers 804, and one end cap. The two dust collection covers 804 are connected to the two U-shaped filter sections 802 respectively, the end cap is connected to one tee connection section 803, and the remaining two tee connection sections are connected to the basic flow channel sections 801. Both the small filter section 805 and the U-shaped filter sections 802 are connected to the basic flow channel sections 801, with the small filter section 805 positioned between the two U-shaped filter sections 802. Referring to the attached diagram, the gas enters the pipeline and flows out after successively changing direction by 180°, 90°, 90°, 180°, 90°, and 90°.

[0036] Specifically, the first U-shaped filter section 802 is located in the upper left corner of the flow channel, the small filter section 805 is located in the lower left corner of the flow channel, and the second U-shaped filter section 802 is located in the lower right corner of the flow channel. During operation, high-temperature air enters the flow channel from the upper left inlet 4, passes through two stages of U-shaped filtration, and exits from the upper right outlet 5. The U-shaped filter section 802 is the main dust removal structure, the small filter section 805 plays an auxiliary dust removal role, and the dust collection chamber of the dust collection cover 804 is used to store micro-dust impurities after inertial separation.

[0037] The outer shell of the pipe 6 is fitted with a cylindrical insulated inner liner. The inner diameter channel of the insulated inner liner serves as a gas flow channel. The insulated inner liner is composed of four ring-shaped layers wrapped sequentially. Figure 3-4 As shown, the four-layer structure consists of, from the inside out, a corundum ceramic layer 701, a zirconia ceramic layer 702, a refractory felt layer 703, and an aerogel insulation layer 704. Each insulation layer is in close contact and nested layer by layer. A boss is provided at the port to increase the airtightness of the flow channel.

[0038] The innermost layer of the insulated liner is a corundum ceramic insulation layer. Corundum ceramic has high temperature resistance, up to 2900K, but its thermal conductivity is relatively high, resulting in good overall temperature resistance but poor insulation performance. The second layer from the inside out is a zirconia ceramic layer 702. Zirconia ceramic has a temperature resistance limit of around 2500K and a low thermal conductivity, balancing temperature resistance and insulation, making it an ideal insulation layer material. However, zirconia ceramic is prone to flaking and flaking at high temperatures, increasing the impurity content in the gas; therefore, a corundum ceramic layer 701 needs to be wrapped around its inner side.

[0039] A layer of refractory felt is wrapped around the zirconia ceramic layer 702. The refractory felt has an extremely low thermal conductivity of approximately 0.032, providing excellent insulation. However, it has poor high-temperature resistance and is not suitable for prolonged operation in high-temperature environments. Therefore, it is placed on the outside of the insulation inner liner. The outermost layer is an aerogel insulation material tightly attached to the 304 stainless steel outer shell 6. The aerogel insulation layer 704 is one of the easiest-to-purchase and easiest-to-manufacture materials with the lowest thermal conductivity, with a thermal conductivity of only 0.016.

[0040] When high-temperature air at 1600K flows into the pipe, it directly contacts the innermost corundum ceramic layer. The smooth surface of the corundum ceramic prevents the introduction of new impurities at high temperatures. After heat transfer is reduced by four layers of insulation material, the temperature of the outermost stainless steel layer is limited to around 400K, meeting the experimental requirements.

[0041] When the filtration pipeline system is in operation, inlet 4 is first opened, and high-temperature gas flows through the channel at a high velocity, passing through the first dust removal point 1 on the upper left. Within the enclosed port space, the high-temperature gas changes direction rapidly after contacting the wall. At this time, dust and impurities in the gas are subjected to a large inertial force, detached from the airflow and thrown into the cavity. Under the influence of gravity, they settle in the dust removal chamber at the bottom of the cavity, completing the first-stage dust removal filtration. Subsequently, the high-temperature air flows sequentially through the second dust removal point 2 on the lower left and the third dust removal point 3 on the lower right, completing three stages of filtration before flowing out of the filtration section through outlet 5 and entering the experimental section.

[0042] The basic flow channel section 801, the U-shaped filter section 802, and the three-way connection section 803 are all modularly designed. This modular design means that only three types of parts need to be manufactured during production, and then assembled into a complete filtration system, reducing production costs. Furthermore, increasing the number of filter sections in the filtration piping system can further enhance dust removal and filtration capabilities. By changing the position of the components, different experimental requirements can be met, making it highly adaptable.

[0043] In this embodiment, the overall flow channel is arranged in a U-shaped flow path, with three dust removal points arranged at the upper left, lower left, and lower right, and equipped with a dust storage chamber. The upper left and lower right dust removal points are responsible for the main filtration and dust removal tasks, while the lower left dust removal point plays an auxiliary role. Therefore, the overall structure is a two-stage U-shaped filtration system with a modular connection design, consisting of dozens of small flow channels connected together. It is easy to install and has low cost. It utilizes the principle of inertial dust removal, taking advantage of the characteristic that high-speed gas changes its flow direction after contacting the end cap and baffle, creating an inertial force difference that throws out impurities and dust, thus completing the filtration of impurities in high-temperature air.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A two-stage U-shaped filtration pipeline system for high-temperature air dust removal, characterized in that, The pipeline system is a pipeline composed of several different pipe sections connected together. The outer shell of the pipeline is fitted with a cylindrical heat-insulating inner liner. The inner diameter channel of the heat-insulating inner liner is a gas flow channel. The heat-insulating inner liner is composed of four ring-shaped layers wrapped in sequence. The four ring-shaped layers, from the inside to the outside, are a corundum ceramic layer, a zirconia ceramic layer, a refractory felt layer, and an aerogel insulation layer. Several different pipe sections include a basic flow channel section and a U-shaped filter section that can change the gas flow direction by 180°. The basic flow channel section is cylindrical and there are several of them. There are at least two U-shaped filter sections, and when the gas flows between two U-shaped filter sections, the gas flow direction changes by at least two 90°.

2. The two-stage U-shaped filtration pipeline system for high-temperature air dust removal according to claim 1, characterized in that: The various pipe sections also include a T-shaped connection section, a dust collection cover, and a small filter section that can change the gas flow direction by 90°. The T-shaped connection section is T-shaped, and the dust collection cover has a dust collection chamber. The small filter section is composed of the T-shaped connection section and the dust collection cover.

3. A two-stage U-shaped filtration pipeline system for high-temperature air dust removal according to claim 2, characterized in that: The U-shaped filter section is T-shaped, with one end of the straight section of the T-shape being open and the other end being sealed. The T-shaped leg end is connected to a dust collection cover.

4. A two-stage U-shaped filtration pipeline system for high-temperature air dust removal according to claim 3, characterized in that: The pipeline system is U-shaped, with several different pipe sections including two U-shaped filter sections and one small filter section. The small filter section is located between the two U-shaped filter sections. Gas enters the pipeline and flows out after changing direction in sequence by 180°, 90°, 90°, 180°, 90°, and 90°.

5. A two-stage U-shaped filtration pipeline system for high-temperature air dust removal according to claim 1, characterized in that: The outer diameter of the insulated inner liner is 250mm, the inner diameter is 100mm, and the total thickness of the insulation layer is 150mm.

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