Diversion, liquid collection and anti-scouring metal hose and installation method and application thereof

Abstract

The invention discloses a flow guiding, liquid collecting and anti-scouring metal hose and a mounting method and application thereof, and belongs to the technical field of metal hoses, the flow guiding, liquid collecting and anti-scouring metal hose comprises an integrated hose, the integrated hose is composed of a corrugated pipe section in the middle and connector sections at the two ends, and a metal woven belt is arranged outside the corrugated pipe section; a guide cylinder and a liquid collecting cylinder are arranged at the bottom end of the interior of the integrated hose, the liquid collecting cylinder abuts against the lower end of the guide cylinder, joint sections at the two ends of the integrated hose are fixedly connected with annular first gaskets, and the first gaskets and the integrated hose are integrally formed; the integrated hose comprises an inner polytetrafluoroethylene pipe layer and an outer metal pipe layer. By arranging the integrated hose and the first gasket which are integrated, the anti-erosion corrosion and anti-vibration effects of the metal hose are effectively improved; due to the multi-layer structure, the integrated hose has the effects of high strength, erosion corrosion resistance, vibration resistance and good heat preservation; and the modularized guide cylinder and the liquid collecting cylinder are simple to disassemble and assemble, so that the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal hoses, and in particular to a metal hose capable of guiding, collecting, and resisting scour, and an installation method and application thereof. Background Art

[0002] At present, the silver catalytic method is widely used in formaldehyde production. The heat exchange section of the formaldehyde oxidizer is the core equipment in the formaldehyde production process. Due to the characteristics of the process, the temperature of the core reaction area of ​​the oxidizer reaches about 650°C. The quenching section is a direct heat exchange equipment. In the shell side, close to the core reaction area, the liquid phase is instantly heated and vaporized to form a violently boiling steam area. After the heat exchange in the quenching section, a large amount of wet steam is generated and transported to the steam drum through the metal hose at the outlet. The wet steam at the outlet causes great vibration and scouring to the metal hose at the shell side outlet of the quenching section, which makes the metal hose easy to break and leak, significantly shortening its service life, affecting normal production, significantly increasing production costs, and posing serious safety hazards.

[0003] Therefore, it is urgent to improve the shell side outlet metal hose, so as to improve the metal hose's ability to resist vibration and scour and eliminate the leakage of the metal hose. Summary of the invention

[0004] The object of the present invention is to provide a metal hose that can divert liquid, collect liquid and resist scour, and an installation method and application thereof, so as to solve the problems in the background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a metal hose that is diverting, collecting, and erosion-resistant, including an integrated hose, wherein the integrated hose consists of a corrugated pipe section in the middle and joint sections at both ends, a metal braided belt is arranged on the outside of the corrugated pipe section, a diversion tube and a liquid collecting tube are arranged at the inner bottom end of the integrated hose, the liquid collecting tube abuts against the lower end of the diversion tube, and both end joint sections of the integrated hose are fixedly connected with an annular first gasket, and the first gasket is integrally formed with the integrated hose; the integrated hose includes an inner polytetrafluoroethylene tube layer and an outer metal tube layer.

[0006] Preferably, the guide tube includes a guide tube body, a support tube and a plurality of fan blades fixedly arranged on the inner wall of the guide tube body, the axial region of the fan blades is connected to the support tube, a plurality of support columns are symmetrically arranged on the inner wall of the support tube, the proximal end of the support column is connected to a throat hole, and the diameter of the middle part of the throat hole is smaller than the diameter of the two ends of the roar hole.

[0007] Preferably, the liquid collecting cylinder includes a liquid collecting cylinder body and a plurality of first liquid collecting plates and a second liquid collecting plate fixedly arranged on the inner wall of the liquid collecting cylinder, the cross-sectional shape of the first liquid collecting plate is a convex crescent shape, the cross-sectional shape of the second liquid collecting plate is a concave crescent shape, and two second liquid collecting plates are correspondingly arranged below the two crescent cusps of the first liquid collecting plate; a second annular gasket is fixedly connected to the bottom of the liquid collecting cylinder.

[0008] Preferably, an annular third gasket is provided between the guide cylinder and the liquid collecting cylinder, and between the bellows section and the guide cylinder.

[0009] Preferably, the guide tube and the liquid collecting tube are both made of polytetrafluoroethylene material, and the sum of the heights of the guide tube, the liquid collecting tube and the two third gaskets is the same as the height of the joint section.

[0010] The present invention also provides a method for installing a metal hose for diverting, collecting and resisting scour, comprising the following steps: S1. The integrated hose is integrally cast and formed. After forming, the liquid collecting cylinder is firstly abutted against the bottom of the guide cylinder, and then the liquid collecting cylinder and the guide cylinder are simultaneously pushed into the lower end of the joint section, so that the top of the guide cylinder abuts against the bottom of the corrugated tube section of the integrated hose, and at the same time, the first gasket and the second gasket are ensured to fit, and the installation of the metal hose is completed; S2. Connect the joint section at the bottom end of the metal hose to the first flange, and connect the joint section at the top end to the drum flange.

[0011] The present invention also provides an application of a metal hose that is flow-guiding, liquid-collecting and scour-resistant. The metal hose is applied to a rapid cooling section in a formaldehyde production process.

[0012] Preferably, the specific application method is: The metal hose is connected to the quenching section of the formaldehyde oxidizer through the first flange. The wet steam in the quenching section of the formaldehyde oxidizer enters the metal hose from the lower joint section. The steam forms turbulence under the disturbance of the liquid collecting cylinder. The first liquid collecting plate collects droplets in the rising steam, which drip onto the second liquid collecting plate and flow out of the lower end of the metal hose along the inner wall of the liquid collecting cylinder. The fan blades force the dehumidified steam to rotate. After a part of the steam passes through the throat hole, the flow velocity increases. At this time, the pressure decreases, prompting the subsequent rotating steam to flow to the central area; the other part of the steam passes through the outer annular area of ​​the throat hole; After passing through the guide tube, the steam gathers in the central area of ​​the pipeline and its speed increases, and it quickly flows out of the metal hose and enters the next process.

[0013] Therefore, the metal hose for diversion, liquid collection and anti-scouring of the present invention and its installation method and application have the following beneficial effects: (1) The surface of the polytetrafluoroethylene layer in the integrated hose is smooth and not easy to adhere to other substances, which can resist the erosion and corrosion of the fluid; the metal tube layer has high strength, especially the metal tube layer in the corrugated tube section, which has a certain degree of expansion and displacement in the axial direction and angle, which can effectively reduce the damage to the pipeline caused by air flow impact or mechanical vibration; the metal braided belt also has high mechanical strength and good bending performance, which is easy to install and adapt to complex pipeline layout. At the same time, the setting of the multi-layer structure reduces the heat transfer coefficient and improves the thermal insulation of the metal hose.

[0014] (2) The integrated hose and the first gaskets at both ends are integrally formed, which avoids the welding interface that is prone to metal fatigue and leakage under the influence of vibration, ensures good sealing performance and improves safety.

[0015] (3) The modular and detachable guide tube and liquid collecting tube can be easily removed from the metal hose, which is convenient for cleaning, inspection and replacement, reducing maintenance costs, reducing downtime and improving flexibility. At the same time, both the guide tube and the liquid collecting tube are made of polytetrafluoroethylene material, which is easy to process and shape, and has excellent erosion resistance and high temperature resistance.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a guide tube and a liquid collecting tube according to an embodiment of the present invention; Figure 3 This is a partial enlarged schematic diagram of point A of an embodiment of the present invention; Figure 4 This is a partial enlarged schematic diagram of point B of an embodiment of the present invention; Figure 5 A top view of a guide tube according to an embodiment of the present invention; Figure 6 A front view of a guide tube according to an embodiment of the present invention; Figure 7 A top view of a liquid collecting cylinder according to an embodiment of the present invention; Figure 8 A front view of a liquid collecting cylinder according to an embodiment of the present invention; Fig. 9 A side view of a liquid collecting cylinder according to an embodiment of the present invention; Reference numerals: 1. Integrated hose; 101. Joint section; 102. Bellows section; 2. Guide tube; 201. Support tube; 202. Fan blade; 203. Guide tube body; 204. Support column; 205. Throat hole; 3. Liquid collecting tube; 301. First liquid collecting plate; 302. Second liquid collecting plate; 303. Liquid collecting tube body; 4. Polytetrafluoroethylene tube layer; 5. Metal tube layer; 6. Metal braided belt; 7. First gasket; 8. Second gasket; 9. Third gasket. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0020] Example like Figure 1-Figure 9 As shown, the present invention provides a metal hose that can divert liquid, collect liquid and resist erosion, including an integrated hose 1. The integrated hose 1 consists of a corrugated pipe section 102 in the middle and joint sections 101 at both ends. The corrugated pipe section 102 is fixedly connected to the outside with a metal braided belt 6. The metal braided belt 6 has high mechanical strength and good bending performance, which is easy to install and adapt to complex pipeline layouts.

[0021] The inner bottom of the integrated hose 1 is embedded with a guide tube 2 and a liquid collecting tube 3, and the liquid collecting tube 3 is abutted against the lower end of the guide tube 2. The liquid collecting tube 3 is used to disturb the wet steam to form turbulence, so that the droplets in the steam gather and fall, and enter the formaldehyde oxidizer quenching section for reuse, which plays the role of dehumidification and recovery; the guide tube 2 rectifies the dehumidified steam, so that the steam quickly passes through the integrated hose 1 from the center of the pipeline, reducing the impact of turbulence on the integrated hose 1.

[0022] The joint sections 101 at both ends of the integrated hose 1 are fixedly connected with an annular first gasket 7. The first gasket 7 is integrally formed with the integrated hose 1, avoiding the welding interface that is prone to metal fatigue and leakage under the influence of vibration, thereby improving safety; the integrated hose 1 includes an internal polytetrafluoroethylene tube layer 4 and an external metal tube layer 5.

[0023] The surface of the polytetrafluoroethylene tube layer 4 is smooth and not easily adhered to other substances, and can resist the erosion and corrosion of the fluid; the metal tube layer 5 has relatively high strength, especially the metal tube layer 5 in the corrugated tube section 102, which has certain expansion and contraction and displacement in the axial direction and angle, and can effectively reduce the damage to the pipeline caused by air flow impact or mechanical vibration; at the same time, the setting of the multi-layer structure reduces the heat transfer coefficient and improves the thermal insulation of the metal hose.

[0024] The liquid collecting cylinder 3 is integrally formed, and includes a liquid collecting cylinder body 303 and a plurality of first liquid collecting plates 301 and second liquid collecting plates 302 fixedly connected to the inner wall of the liquid collecting cylinder body 303. The cross-sectional shape of the first liquid collecting plate 301 is a convex crescent shape, and the cross-sectional shape of the second liquid collecting plate 302 is a concave crescent shape. Two second liquid collecting plates 302 are correspondingly arranged below the two crescent tips of the first liquid collecting plate 301. The liquid-carrying steam forms turbulence under the disturbance of the first liquid collecting plate 301 and the second liquid collecting plate 302. The first liquid collecting plate 301 will collect the droplets in the steam, and the droplets will drip along the crescent tips of the first liquid collecting plate 301 into the grooves of the second liquid collecting plate 302. After reaching a certain amount, the droplets will flow out of the metal hose along the inner wall and enter the formaldehyde oxidizer quenching section for reuse; a second annular gasket 8 is fixedly connected to the bottom of the liquid collecting cylinder 3.

[0025] The guide tube 2 includes a guide tube body 203, a support tube 201 and a plurality of fan blades 202 fixedly arranged on the inner wall of the guide tube body 203. The axial region of the fan blades 202 is connected to the support tube 201. The fan blades 202 will rotate under the influence of turbulence, so that the steam gathers to the axial region of the fan blades 202. A plurality of support columns 204 are symmetrically arranged on the inner wall of the support tube 201. The proximal end of the support column 204 is connected to a throat hole 205. The diameter of the middle part of the throat hole 205 is smaller than the diameter at both ends.

[0026] The diameter of the front half of the throat hole 205 is reduced, and the steam flow will be accelerated, causing the pressure in the front half to decrease. At the same time, the subsequent steam will be gathered to the axial area of ​​the fan blade 202. After a part of the steam passes through the throat hole 205, the flow velocity increases, and the other part passes through the annular area surrounded by the support column 204 under the action of pressure, which will also increase the flow velocity. Therefore, after passing through the guide tube 2, the steam will be rectified to the central area of ​​the pipeline and quickly pass through the integrated hose 1, avoiding the impact of turbulence on the pipeline and extending the service life of the metal hose.

[0027] An annular third gasket 9 is arranged between the guide tube 2 and the liquid collecting tube 3, and between the bellows section 102 and the guide tube 2. The third gasket 9 is preferably made of polytetrafluoroethylene material to prevent steam from passing through the gaps around the fan blades 202 and to limit the rotating steam to the center position, thereby improving the sealing between the components.

[0028] The guide tube 2 and the liquid collecting tube 3 are both made of polytetrafluoroethylene. The sum of the heights of the guide tube 2 , the liquid collecting tube 3 and the two third gaskets 9 is the same as the height of the joint section 101 .

[0029] The specific installation method of the metal hose is as follows: S1. The integrated hose is integrally cast and formed. After forming, the liquid collecting cylinder 3 is firstly abutted against the bottom of the guide cylinder 2, and then the liquid collecting cylinder 3 is pushed into the joint section 101 at the lower end, so that the top of the guide cylinder 2 abuts against the bottom of the corrugated tube section 102 of the integrated hose 1, and the first gasket 7 and the second gasket 8 are fitted, and the installation of the metal hose is completed; S2. Connect the joint section 101 at the bottom end of the metal hose to the first flange, and connect the joint section 101 at the top end to the drum flange.

[0030] The above metal hose is applied in the formaldehyde production process, or applied in the steam pipeline. This embodiment provides its application in the formaldehyde production process.

[0031] The heat exchange section of the formaldehyde oxidizer is the core equipment in the formaldehyde production process, and is designed as a vertical shell-and-tube heat exchanger. Due to the characteristics of the process, the temperature of the reaction core area reaches about 650°C. Therefore, in the shell side near the reaction core area, the liquid phase is instantly heated and vaporized to form a violently boiling steam area. The steam-water mixture is transported to the steam drum through a metal hose, which is connected to the formaldehyde oxidizer quenching section through the first flange and applied to formaldehyde production.

[0032] After the hose and the formaldehyde oxidizer quenching section are installed, the wet steam in the formaldehyde oxidizer quenching section enters the metal hose from the lower joint section 101, and the steam forms turbulence under the disturbance of the liquid collecting cylinder 3. The first liquid collecting plate 301 will collect droplets in the rising steam, drip onto the second liquid collecting plate 302, and flow out of the metal hose along the inner wall of the liquid collecting cylinder 3; the fan blades 202 force the dehumidified steam to rotate, and a part of the steam increases its flow rate after passing through the throat hole 205. At this time, the pressure decreases, prompting the subsequent rotating steam to flow to the central area; the other part of the steam passes through the outer annular area of ​​the throat hole 205; after passing through the guide cylinder 2, the steam gathers in the central area of ​​the pipeline and the speed increases, and it quickly flows out of the metal hose.

[0033] Therefore, the present invention provides a metal hose that can guide, collect and resist erosion, and its installation method and application. The polytetrafluoroethylene tube layer used in the invention has a smooth surface, is not easy to adhere to other substances, and can resist the erosion and corrosion of the fluid; the metal tube layer has high strength, especially the metal tube layer in the corrugated tube section, which has a certain degree of expansion and displacement in the axial direction and angle, and can effectively reduce the damage to the pipeline caused by air flow impact or mechanical vibration; the metal braided belt also has high mechanical strength and good bending performance, which is easy to install and adapt to complex pipeline layouts. At the same time, the setting of the multi-layer structure reduces the heat transfer coefficient and improves the thermal insulation of the metal hose.

[0034] The integrated hose and the first gaskets at both ends are integrally formed, which avoids the welding interface that is prone to leakage due to metal fatigue under the influence of vibration, ensures good sealing performance and improves safety.

[0035] The modular and detachable guide tube and liquid collecting tube can be easily removed from the metal hose for easy cleaning, inspection and replacement, which reduces maintenance costs, reduces downtime and improves flexibility. At the same time, both the guide tube and the liquid collecting tube are made of polytetrafluoroethylene material, which is easy to process and shape, and has excellent erosion resistance and high temperature resistance.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A metal hose for diversion, collection and anti-scouring, characterized by: It comprises an integrated hose, which consists of a corrugated pipe section in the middle and joint sections at both ends, a metal braided belt is arranged on the outside of the corrugated pipe section, a flow guide tube and a liquid collecting tube are arranged on the inner bottom end of the integrated hose, the liquid collecting tube abuts against the lower end of the flow guide tube, and both end joint sections of the integrated hose are fixedly connected with an annular first gasket, which is integrally formed with the integrated hose; the integrated hose comprises an inner polytetrafluoroethylene tube layer and an outer metal tube layer.

2. The metal hose for guiding, collecting and resisting scour according to claim 1, characterized in that: The guide tube includes a guide tube body, a support tube and a plurality of fan blades fixedly arranged on the inner wall of the guide tube body, the axial area of ​​the fan blades is connected to the support tube, a plurality of support columns are symmetrically arranged on the inner wall of the support tube, the proximal end of the support column is connected to a throat hole, and the diameter of the middle part of the throat hole is smaller than the diameter of the two ends of the roar hole.

3. The metal hose for guiding, collecting and resisting scour according to claim 2, characterized in that: The liquid collecting cylinder includes a liquid collecting cylinder body and a plurality of first liquid collecting plates and a second liquid collecting plate fixedly arranged on the inner wall of the liquid collecting cylinder, the cross-sectional shape of the first liquid collecting plate is a convex crescent shape, the cross-sectional shape of the second liquid collecting plate is a concave crescent shape, and two second liquid collecting plates are correspondingly arranged below the two crescent cusps of the first liquid collecting plate; a second annular gasket is fixedly connected to the bottom of the liquid collecting cylinder.

4. The metal hose for guiding, collecting and resisting scour according to claim 3, characterized in that: An annular third gasket is arranged between the guide tube and the liquid collecting tube, and between the bellows section and the guide tube.

5. The metal hose for guiding, collecting and resisting scour according to claim 4, characterized in that: The guide tube and the liquid collecting tube are both made of polytetrafluoroethylene. The sum of the heights of the guide tube, the liquid collecting tube and the two third gaskets is the same as the height of the joint section.

6. A method for installing a metal hose for diversion, liquid collection and anti-scour according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. The integrated hose is integrally cast and formed. After forming, the liquid collecting cylinder is firstly abutted against the bottom of the guide cylinder, and then the liquid collecting cylinder and the guide cylinder are simultaneously pushed into the lower end of the joint section, so that the top of the guide cylinder abuts against the bottom of the corrugated tube section of the integrated hose, and at the same time, the first gasket and the second gasket are ensured to fit, and the installation of the metal hose is completed; S2. Connect the joint section at the bottom end of the metal hose to the first flange, and connect the joint section at the top end to the drum flange.

7. An application of the metal hose for diversion, liquid collection and anti-scour according to any one of claims 1 to 5, characterized in that: The metal hose is used in the formaldehyde production process.

8. Application of the metal hose for diversion, liquid collection and anti-scouring according to claim 7, characterized in that: The specific application method is: The metal hose is connected to the quenching section of the formaldehyde oxidizer through the first flange. The wet steam in the quenching section of the formaldehyde oxidizer enters the metal hose from the lower joint section. The steam forms turbulence under the disturbance of the liquid collecting cylinder. The first liquid collecting plate collects droplets in the rising steam, which drip onto the second liquid collecting plate and flow out of the lower end of the metal hose along the inner wall of the liquid collecting cylinder. The fan blades force the dehumidified steam to rotate. After a part of the steam passes through the throat hole, the flow velocity increases. At this time, the pressure decreases, prompting the subsequent rotating steam to flow to the central area; the other part of the steam passes through the outer annular area of ​​the throat hole; After passing through the guide tube, the steam gathers in the central area of ​​the pipeline and its speed increases, and it quickly flows out of the metal hose and enters the next process.

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