CN114776920B - High-temperature air injection equipment for FRP pipeline - Google Patents
High-temperature air injection equipment for FRP pipeline Download PDFInfo
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- CN114776920B CN114776920B CN202210433099.9A CN202210433099A CN114776920B CN 114776920 B CN114776920 B CN 114776920B CN 202210433099 A CN202210433099 A CN 202210433099A CN 114776920 B CN114776920 B CN 114776920B
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- pipeline
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- stainless steel
- heat insulation
- flange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
- F16L23/026—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to high-temperature air injection equipment for an FRP pipeline, which comprises an FRP main pipeline, an FRP branch pipeline, a hot air metal pipeline, a stainless steel flange cover and a heat insulation connecting component; one end of the FRP branch pipeline is communicated with the FRP main pipeline, and the other end of the FRP branch pipeline is provided with an FRP flange; the hot air metal pipeline comprises a carbon steel pipeline and a stainless steel pipeline, the carbon steel pipeline is provided with a carbon steel flange at the end part, and one end of the stainless steel pipeline is provided with a stainless steel flange connected with the carbon steel flange; the other end of the stainless steel pipeline is inserted into the FRP branch pipeline and then enters the FRP main pipeline, the stainless steel flange cover is welded and fixed on the outer wall of the stainless steel pipeline, and the stainless steel flange cover is connected with the FRP flange through a heat insulation connecting component; the heat insulation gasket is clamped between the stainless steel flange cover and the FRP flange; the top of the stainless steel pipeline is provided with a spray hole communicated with the FRP main pipeline. The invention realizes good heat insulation effect after the butt joint of the hot air metal pipeline and the FRP pipeline, and avoids carbonization failure of the FRP pipeline caused by high-temperature hot air.
Description
Technical Field
The invention belongs to the field of petrochemical device design, and particularly relates to high-temperature air injection equipment for FRP (fiber reinforced Plastic) pipelines.
Background
The FRP pipeline is a light, high-strength and corrosion-resistant nonmetallic pipeline, has excellent corrosion resistance and long service life, and is widely applied to industries such as petroleum, chemical industry, drainage and the like. In the field of petrochemical plants, for example sulfuric acid plants, there are parts of process lines with SO2 as transport medium, the material of which is selected as FRP material. In order to increase the conversion rate of SO2 to SO3 in the subsequent reaction process, a stream of hot air is injected into the FRP pipeline in the device, SO as to increase the oxygen content in SO2 process gas and create necessary chemical reaction conditions for the subsequent generation of sulfuric acid.
At the hot air injection point of the FRP pipeline, the hot air pipeline is generally designed to have a higher temperature of about 250 ℃, the operating temperature is about 137 ℃, and the pipeline is made of carbon steel or stainless steel. While FRP pipe materials are generally used below 100 ℃, the highest operating temperature cannot exceed 120 ℃, otherwise carbonization is easy to occur at the contact point, and the materials are invalid. Therefore, the connection flange of the hot air pipeline and the FRP pipeline needs to be reasonably designed, heat is prevented from being conducted to the FRP pipeline by the hot air pipeline, and carbonization of the FRP pipe fitting and material failure are avoided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides high-temperature air injection equipment for the FRP pipeline, which realizes good heat insulation after the butt joint of a hot air metal pipeline and the FRP pipeline, and avoids carbonization failure of the FRP pipeline caused in the high-temperature air injection process.
The invention aims at solving the technical problems by adopting the following technical scheme. The high-temperature air injection equipment for the FRP pipeline comprises an FRP main pipeline, an FRP branch pipeline, a hot air metal pipeline, a stainless steel flange cover, a heat insulation gasket and a heat insulation connecting component; one end of the FRP branch pipeline is vertically communicated with the FRP main pipeline, and the other end of the FRP branch pipeline is provided with an FRP flange; the hot air metal pipeline comprises a carbon steel pipeline and a stainless steel pipeline, the end part of the carbon steel pipeline is provided with a carbon steel flange, one end of the stainless steel pipeline is provided with a stainless steel flange, and the stainless steel flange is connected with the carbon steel flange to realize the communication between the carbon steel pipeline and the stainless steel pipeline; the other end of the stainless steel pipeline is inserted into the FRP branch pipeline and then enters the FRP main pipeline, the stainless steel flange cover is welded and fixed on the outer wall of the stainless steel pipeline, and the stainless steel flange cover is connected with the FRP flange through the heat insulation connecting component; the heat insulation gasket is clamped between the stainless steel flange cover and the FRP flange; the stainless steel pipeline top that is located the inside of FRP trunk line has seted up a plurality of orifice that communicates with the FRP trunk line, the other end of stainless steel pipeline is with the end plate shutoff.
Further, the heat insulation connecting assembly comprises a full-thread bolt, a nut and a bolt heat insulation pad, wherein a stainless steel flange cover is provided with first bolt holes distributed circumferentially, and an FRP flange is provided with second bolt holes distributed circumferentially; after the full-thread bolt sequentially passes through the corresponding first bolt hole and the corresponding second bolt hole, the two ends of the full-thread bolt are respectively in threaded connection with a nut, so that the stainless steel flange cover and the FRP flange are relatively locked and fixed, the bolt heat insulation pad is sleeved on the full-thread bolt, the bolt heat insulation pad comprises an integrally formed head part and a hollow rod part, the head part is pressed and fixed between the nut and the FRP flange, and the hollow rod part is arranged between the inner wall of the second bolt hole and the outer wall of the full-thread bolt.
Further, the hollow rod portion is attached to the inner wall of the second bolt hole, and the hollow rod portion is not attached to the outer wall of the full-thread bolt.
Further, the bolt heat insulation pad is made of PTFE, and the thicknesses of the head part and the hollow rod part of the bolt heat insulation pad are not smaller than 15mm.
Further, the heat insulation gasket is annular, the material of the heat insulation gasket is PTFE, and the thickness of the heat insulation gasket is 30mm.
Further, the outer diameter of the heat insulation gasket is the same as the outer diameters of the stainless steel flange cover and the FRP flange, and the inner diameter of the heat insulation gasket is 2-3mm larger than the outer diameter of the stainless steel pipeline.
Further, the other end of the stainless steel pipeline extends into the inner wall of the FRP pipeline, which is close to the FRP pipeline and is far away from the FRP branch pipeline.
Further, two rows of spray holes are arranged on the stainless steel pipeline, each row of spray holes are distributed along the axial direction of the stainless steel pipeline, and the included angle between the central axis of each spray hole and the axis of the FRP main pipeline is 45 degrees.
Further, the sum of the total areas of all the spray holes is not smaller than the sectional area of the stainless steel pipeline.
Further, one end of the stainless steel pipeline is welded and communicated with a concentric reducing pipe, and the large-diameter end of the concentric reducing pipe is provided with the stainless steel flange; the large diameter end of the concentric reducing pipe is connected with the carbon steel pipe, and the small diameter end is connected with the stainless steel pipe, so that hot air can be accelerated after entering the stainless steel pipe from the carbon steel pipe, and the hot air can be sprayed out from the spray hole and can be obliquely collided and mixed with process gas.
The beneficial effects of the invention are as follows:
according to the chemical flat wall heat conduction principle, the heat insulation connection between the hot air metal pipeline and the FRP pipeline is realized by using the heat insulation gasket and the bolt heat insulation pad which are made of PTFE materials, so that the carbonization failure of a pipe fitting caused by directly transferring the heat of the hot air to the FRP main pipeline can be avoided, the specific size requirements of the heat insulation gasket and the bolt heat insulation pad are reasonably designed, and the size requirements of non-standard flanges are defined according to the related flange standards. Meanwhile, after the hot air metal pipeline stretches into the FRP main pipeline, a plurality of spray holes are formed in the top of the hot air metal pipeline, so that the hot air and the process gas in the FRP main pipeline are mixed more fully.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention given in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram showing the front view of a high-temperature air injecting apparatus for FRP pipes according to the present invention.
Fig. 2 is a schematic top view of a high-temperature air injection apparatus for FRP piping of the present invention.
Fig. 3 is a schematic view of the heat insulating gasket of the present invention.
FIG. 4A is a side cross-sectional view of the FRP flange of the present invention.
Fig. 4B is a front view of the FRP flange of the present invention.
Fig. 5 is a front view of a stainless steel flange cover according to the present invention.
Fig. 6A is a side view of a bolt insulation blanket of the present invention.
Fig. 6B is a front view of a bolt insulation blanket of the present invention.
FIG. 7 is a schematic view of a single insulated connection assembly of the present invention.
FIG. 8 is a schematic view of a single insulated connection assembly in another embodiment.
FIG. 9 is a schematic illustration of the thermal insulation principle of the present invention after assembly of the thermal insulation connection assembly with the FRP flange.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and the preferred embodiments.
Referring to fig. 1 to 9, a high temperature air injection apparatus for FRP pipe includes a FRP main pipe 1, an FRP branch pipe 2, an FRP flange 3, a hot air metal pipe 4, a stainless steel flange cover 5, a heat insulation spacer 6, and a heat insulation connection assembly 7. The FRP main pipeline is designed according to the flow of the process gas, and proper pipe diameter and wall thickness are selected; the FRP branch pipeline is vertically communicated with the FRP main pipeline 1, and the pipe diameter of the FRP branch pipeline is properly selected according to the hot air quantity required by chemical reaction; in this embodiment, the FRP branch pipe has a pipe diameter larger than the hot air metal pipe by two levels, for example, when the pipe diameter of the hot air metal pipe 4 is DN400, the FRP branch pipe has a pipe diameter selected to be DN500, so that the hot air metal pipe is inserted into the FRP main pipe through the FRP branch pipe. The FRP flange is arranged at the end part of the FRP branch pipeline, and a special FRP flange with nonstandard size is used for connecting a hot air metal pipeline, and the nonstandard FRP flange is connected with a nonstandard stainless steel flange cover.
The hot air metal pipeline 4 comprises a carbon steel pipeline 8 and a stainless steel pipeline 9, and the carbon steel pipeline 8 is used for conveying hot air; the stainless steel pipeline 9 is 904L stainless steel pipeline, and the welding of stainless steel pipeline 9 one end has concentric reducing pipe 10, and the material of concentric reducing pipe is the same with the stainless steel pipeline, and the tip of concentric reducing pipe is equipped with the stainless steel flange 11 of standard 904L material, and the one end of carbon steel pipeline is equipped with carbon steel flange 12, and stainless steel flange 11 links to each other with carbon steel flange 12 in order to realize the connection of carbon steel pipeline and stainless steel pipeline, and the other end of stainless steel pipeline 9 gets into in FRP trunk line 1 after inserting FRP lateral pipe 2. The large diameter end of the concentric reducer 10 is connected with a carbon steel pipeline, the small diameter end is connected with a stainless steel pipeline, and the connection of pipelines with different diameters at two ends is realized, so that hot air enters the stainless steel pipeline from the carbon steel pipeline and is accelerated, and the mixing between the hot air and process gas is facilitated. Of course, in another embodiment, the concentric reducer 10 may not be provided, and the stainless steel pipe may be directly connected to the carbon steel pipe through a flange, and the diameters of the stainless steel pipe and the carbon steel pipe may be set to be the same.
A hole 52 for the stainless steel pipeline to pass through is formed in the center of the stainless steel flange cover 5, so that the hot air metal pipeline can penetrate through the stainless steel flange cover and then penetrate into the FRP main pipeline; stainless steel flange cover 5 welds on stainless steel pipeline outer wall, and stainless steel flange cover 5 is supporting with FRP flange 3, and stainless steel flange cover 5 links to each other through thermal-insulated coupling assembling 7 is fixed between the FRP flange 3 to realize the fixed connection of hot air metal pipeline and FRP lateral duct, and make stainless steel pipeline coaxial arrangement in the FRP lateral duct, and then make stainless steel pipeline overhang in the FRP trunk line. The heat insulation gasket 6 is clamped between the stainless steel flange cover 5 and the FRP flange 3, the heat insulation gasket 6 is in a ring shape, adopts a PTFE heat insulation gasket, can bear high temperature of 250 ℃, can be used as a sealing gasket for connecting the FRP flange and the stainless steel flange cover, is small in heat conductivity coefficient and is 0.256W/(m.k), and can be used as a heat insulation part after a heat transfer mathematical model is established and flat wall heat conduction calculation is carried out.
The thickness of the heat insulating pad 6 is calculated from the temperature at the time of hot air injection and the FRP allowable temperature, and in this embodiment, the thickness of the heat insulating pad is calculated as follows: the heat conductivity coefficient of the PTFE heat insulation gasket is 0.256W/(m.k); the temperature of the hot air metal pipeline end is 137 ℃, the temperature of the FRP pipeline (comprising an FRP main pipeline and an FRP branch pipeline which are vertically communicated) end is 83 ℃, and the allowable temperature of the FRP pipeline is 120 ℃; when calculating the thickness of the PTFE heat insulation gasket, a heat transfer mathematical model is established, and the calculation formula is as follows:
σ＝λ×(t-t s )/(α×(t s -t a ))；
wherein sigma is the thickness of the heat insulation gasket, and the unit is m; lambda is the heat conductivity coefficient of the PTFE heat insulation gasket, and the unit is W/(m.k); t is the temperature of the hot air metal pipeline end, and the unit is the temperature; t is t s The allowable temperature of the FRP pipeline is expressed as the unit of the temperature; t is t a The temperature of the FRP pipeline end is expressed as the unit of the temperature; alpha is the heat dissipation coefficient of the outer surface of the heat insulation gasket, and the heat dissipation coefficient of the heat insulation layer is referred to 'SH/T3010-2013 petrochemical equipment and pipeline heat insulation engineering design Specification', and alpha=11.6W/(m) 2 K) is described. After substituting the above values, σ=10.14 mm is calculated, so in order to achieve a better heat insulation effect, σ should be greater than 10.14, and in this embodiment, the thickness of the heat insulation pad 6 is 30mm.
Further, the outer diameter of the heat insulation gasket 6 is the same as the outer diameters of the stainless steel flange cover 5 and the FRP flange 3, and the inner diameter of the heat insulation gasket 6 is 2-3mm larger than the outer diameter of the stainless steel pipeline.
The heat insulation connecting assembly 7 comprises a full-thread bolt 13, a nut 14 and a bolt heat insulation pad 15, wherein a plurality of first bolt holes 51 are circumferentially distributed on the stainless steel flange cover 5, a plurality of second bolt holes 31 are circumferentially distributed on the FRP flange 3, the full-thread bolt sequentially passes through the corresponding first bolt holes 51 and the second bolt holes 31 and is in threaded connection with the nut, two nuts are required to be matched when the full-thread bolt is adopted, the two nuts are respectively in threaded fit with two ends of the full-thread bolt, the bolt heat insulation pad is sleeved on the full-thread bolt 13, the head 151 of the bolt heat insulation pad is tightly pressed and fixed between the nut 13 and the FRP flange 3, a hollow rod part 152 of the bolt heat insulation pad is arranged between the inner wall of the second bolt holes 31 and the outer wall of the full-thread bolt, the hollow rod part is attached to the inner wall of the second bolt holes 31, but the hollow rod part is not attached to the screw rod, so that a better heat insulation effect is achieved; the bolt heat insulation pad is only arranged on the FRP flange side. The material of the bolt heat insulation pad 15 is PTFE, and because the heat conduction condition exists in the metal full-thread bolt and the nut, the PTFE bolt heat insulation pad not only isolates the screw from the FRP flange, but also isolates the heat conduction between the nut and the FRP flange; in order to ensure the heat insulation effect, the heat insulation thickness of each part of the bolt heat insulation pad is not less than 15mm, namely the thickness of the head part and the hollow rod part of the bolt heat insulation pad is more than or equal to 15mm. In this embodiment, the number and positions of the bolt holes 61 formed in the heat insulation gasket 6 are the same as the number and positions of the second bolt holes in the FRP flange 3, and the diameter of the bolt holes 61 is 2-3mm larger than the full-thread bolt specification.
In another embodiment, as shown in fig. 8, the full-thread bolts 13 may be replaced by conventional head bolts 17, and each head bolt 17 is only required to be provided with a lock nut on one side of the FRP flange.
In the embodiment, the inner diameter of the FRP flange 3 is the same as the inner diameter of a standard flange with the same specification; the radius of the FRP flange is 30mm larger than that of a standard flange with the same specification; the number of the second bolt holes of the FRP flange is the same as that of the standard flange with the same specification, the aperture is enlarged by 30mm so as to install the bolt heat insulation pad, and compared with the standard flange with the same specification, the second bolt holes are far away from the center of the FRP flange by 15mm.
The stainless steel pipeline 9 is inserted into the tail end of the inner section of the FRP main pipeline 1, namely, the other end of the stainless steel pipeline 9 is close to the inner wall of one side, far away from the FRP branch pipeline, in the FRP pipeline, so that the stainless steel pipeline has a larger area to form the spray hole. An end plate 16 is welded at the other end of the stainless steel pipeline 9 for end sealing, so that hot air can be sprayed out of the spray holes along the radial direction of the stainless steel pipeline only. The top of the stainless steel pipeline 9 positioned in the FRP pipeline is provided with a plurality of spray holes 91 according to the required hot air quantity, preferably, the stainless steel pipeline is provided with two rows of spray holes, each row of spray holes are distributed along the axial direction of the stainless steel pipeline, the spray holes are obliquely upwards arranged by 45 degrees, namely, the two rows of spray holes are symmetrically arranged on two sides of the top axis of the stainless steel pipeline, the included angle between the central axis of the spray holes and the axis of the FRP main pipeline is 45 degrees, and the flow direction of SO2 process gas in the FRP main pipeline 1 is from bottom to top, SO that the spray direction of the hot air and the flow direction of the SO2 process gas are included angles of 45 degrees; in this embodiment, the sum of the total areas of all the spray holes is not smaller than the cross-sectional area of the stainless steel pipeline, and in another embodiment, the sum of the total areas of the spray holes is preferably not smaller than the cross-sectional area of the maximum diameter section of the hot air metal pipeline, SO that the hot air and the SO2 process gas are fully mixed while the hot air flow is ensured, and the preparation is made for the subsequent reaction.
The above description is only of the preferred embodiments of the present invention, and any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention will still fall within the scope of the technical solutions of the present invention.
Claims (5)
1. The high-temperature air injection device for the FRP pipeline is characterized by comprising an FRP main pipeline, an FRP branch pipeline, a hot air metal pipeline, a stainless steel flange cover, a heat insulation gasket and a heat insulation connecting component; one end of the FRP branch pipeline is vertically communicated with the FRP main pipeline, and the other end of the FRP branch pipeline is provided with an FRP flange; the hot air metal pipeline comprises a carbon steel pipeline and a stainless steel pipeline, the end part of the carbon steel pipeline is provided with a carbon steel flange, one end of the stainless steel pipeline is provided with a stainless steel flange, and the stainless steel flange is connected with the carbon steel flange to realize the communication between the carbon steel pipeline and the stainless steel pipeline; the other end of the stainless steel pipeline is inserted into the FRP branch pipeline and then enters the FRP main pipeline, the stainless steel flange cover is welded and fixed on the outer wall of the stainless steel pipeline, and the stainless steel flange cover is connected with the FRP flange through the heat insulation connecting component; the heat insulation gasket is clamped between the stainless steel flange cover and the FRP flange; a plurality of spray holes communicated with the FRP main pipeline are formed in the top of a stainless steel pipeline positioned in the FRP main pipeline, and the other end of the stainless steel pipeline is plugged by an end plate; the heat insulation connecting assembly comprises a full-thread bolt, a nut and a bolt heat insulation pad, wherein a stainless steel flange cover is provided with first bolt holes distributed circumferentially, and the FRP flange is provided with second bolt holes distributed circumferentially; after sequentially passing through the corresponding first bolt hole and second bolt hole, the two ends of the full-thread bolt are respectively in threaded connection with a nut, a bolt heat insulation pad is sleeved on the full-thread bolt, the bolt heat insulation pad comprises an integrally formed head and a hollow rod part, the head is pressed and fixed between the nut and the FRP flange, the hollow rod part is arranged between the inner wall of the second bolt hole and the outer wall of the full-thread bolt, the hollow rod part is attached to the inner wall of the second bolt hole, and the hollow rod part is not attached to the outer wall of the full-thread bolt; the bolt heat insulation pad is made of PTFE, and the thickness of the head part and the hollow rod part of the bolt heat insulation pad is not less than 15mm; the heat insulation gasket is in a circular ring shape, the heat insulation gasket is made of PTFE, the thickness of the heat insulation gasket is 30mm, the outer diameter of the heat insulation gasket is the same as the outer diameters of the stainless steel flange cover and the FRP flange, and the inner diameter of the heat insulation gasket is 2-3mm larger than the outer diameter of the stainless steel pipeline;
when the thickness of the heat insulation gasket is calculated, a heat transfer mathematical model is established, and the calculation formula is as follows:
σ＝λ×(t-t s )/(α×(t s -t a ))；
wherein sigma is the thickness of the heat insulation gasket, and the unit is m; lambda is the heat conductivity coefficient of the heat insulation gasket, and the unit is W/(m.k); t is the temperature of the hot air metal pipeline end, and the unit is the temperature; t is t s The allowable temperature of the FRP main pipeline and the FRP branch pipeline is expressed as the unit of the temperature; t is t a The temperature of the FRP main pipeline and the FRP branch pipeline is expressed in the unit of DEG C; alpha is the heat dissipation coefficient of the outer surface of the heat insulation gasket.
2. The high-temperature air injection device for FRP piping according to claim 1, characterized in that: the other end of the stainless steel pipeline stretches into the inner wall of the FRP pipeline far away from the FRP branch pipeline.
3. A high-temperature air injection apparatus for FRP piping according to claim 1 or 2, characterized in that: two rows of spray holes are arranged on the stainless steel pipeline, each row of spray holes are distributed along the axial direction of the stainless steel pipeline, and the included angle between the central axis of each spray hole and the axis of the FRP main pipeline is 45 degrees.
4. A high-temperature air injection apparatus for FRP piping as claimed in claim 3, characterized in that: the sum of the total areas of all spray holes is not smaller than the sectional area of the stainless steel pipeline.
5. The high-temperature air injection device for FRP piping according to claim 1, characterized in that: one end of the stainless steel pipeline is welded and communicated with a concentric reducing pipe, and the large-diameter end of the concentric reducing pipe is provided with the stainless steel flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210433099.9A CN114776920B (en) | 2022-04-24 | 2022-04-24 | High-temperature air injection equipment for FRP pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210433099.9A CN114776920B (en) | 2022-04-24 | 2022-04-24 | High-temperature air injection equipment for FRP pipeline |
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| CN114776920A CN114776920A (en) | 2022-07-22 |
| CN114776920B true CN114776920B (en) | 2023-10-20 |
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| CN112082028A (en) * | 2020-08-20 | 2020-12-15 | 北方华锦化学工业股份有限公司 | High-parameter hydrogenation device pipeline mixer and design and manufacturing method thereof |
| CN214345665U (en) * | 2020-12-15 | 2021-10-08 | 中国石油化工股份有限公司 | Fuel gas and air mixer for regeneration gas pipeline |
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| CN114776920A (en) | 2022-07-22 |
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