CN213145626U

CN213145626U - Mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of thermal power plant

Info

Publication number: CN213145626U
Application number: CN202020642722.8U
Authority: CN
Inventors: 廖延君; 王星杰; 胡琴
Original assignee: Langfang Derun Technology Co ltd
Current assignee: Langfang Derun Technology Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-05-07
Anticipated expiration: 2030-04-24

Abstract

Mineral thick liquid is carried wear-resisting anticorrosive composite pipe connection structure for wet flue gas desulfurization of steam power plant belongs to composite pipe connection structure technical field. The composite pipe elbow structure is an internally communicated elbow structure formed by sequentially connecting and welding at least three sections of composite pipes, and the independent three-way pipe structure is an internally communicated three-way pipe structure formed by welding the ends of the three sections of composite pipes together; the composite pipe is formed by coaxially embedding an inner layer and at least one outer layer together in a hot-melt co-extrusion manner; the outer layer is one or more layers of coaxial layered structures which are compositely nested together through hot melting coextrusion; the thickness of the inner layer is 1.0-10.0 mm, and the total thickness of the outer layer is 5.0-50.0 mm. The requirements of the composite pipe fitting on the shape and the angle of the site are met, and the purpose of pipeline connection is achieved through a hot melting welding mode.

Description

Mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of thermal power plant

Technical Field

The application belongs to the technical field of composite pipe connection structures, and particularly relates to a mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connection structure for wet desulphurization of a thermal power plant.

Background

In the wet desulphurization process of a thermal power plant, the mineral slurry generated by the reaction of lime milk and soot mainly contains a mixture of sulfite, sulfate, nitrate, carbonate, acid and the like, and has strong corrosivity, and solid particles in the slurry abrade a conveying pipeline and a pipe fitting at the same time, so that the service life of the conveying pipeline is seriously shortened. The mineral slurry mixture has strong corrosivity to metal materials, and meanwhile, the metal pipeline is abraded greatly in the conveying process, particularly at the joint of the pipe fittings (such as an elbow at a corner), the conveying pipeline and the pipe fittings have to be replaced or maintained frequently, so that the production cost and the workload are increased, and the normal operation of equipment is influenced sometimes.

The recent advent of rubber lining metal pipes has partially solved the above problems. The rubber pipe with the lining is made of a metal pipe according to requirements, and a rubber sheet with good wear resistance is attached to the inner wall of the metal pipe to serve as a wear-resistant and anti-corrosion layer of the pipe. A layer of solvent-based liquid adhesive is coated between the inner wall of the metal pipe fitting and the rubber sheet so as to ensure that the rubber sheet is well adhered to the inner wall of the metal pipe fitting. The method for sticking the rubber layer in the metal pipe fitting combines the advantages of the non-metal material and the steel material, solves the problems of wear resistance and corrosion resistance of the pipe fitting, and also solves the defects of corrosion resistance and non-pressure resistance of the non-metal pipe fitting, pressure resistance and non-corrosion resistance of the steel pipe fitting and the like. Like the rubber-lined pipeline, the connection of the pipe fitting is still the weak point of the whole pipeline, so that the pipe fitting is easy to bulge and fall off, and the pipe fitting is high in production cost and troublesome in processing procedure. The steel lining pipe fitting is the same as the lining rubber sheet of the pipe, a solvent type liquid adhesive is used in the processing process, and the Volatile Organic Compound (VOC) of the solvent type liquid adhesive brings great harm and influence to the environment and construction operators.

SUMMERY OF THE UTILITY MODEL

The wear-resistant anti-corrosion composite pipe fitting is characterized in that the wear-resistant anti-corrosion composite pipe fitting comprises a pipe fitting body, a pipe fitting body and a pipe fitting body, wherein the pipe fitting body is provided with a plurality of holes, the holes are arranged on the pipe fitting body, the pipe fitting body is provided with a plurality of wear-resistant anti-corrosion composite pipe fittings, the pipe fitting body is provided with a plurality of holes, the holes are arranged on the pipe fitting body, the. In addition, the pipe fitting has the advantages of more reasonable price, light weight, more convenient installation and construction and saving a large amount of installation and maintenance cost.

The composite pipe connecting structure is divided into an independent composite pipe elbow structure and a composite pipe tee structure, wherein the composite pipe elbow structure is an internally communicated elbow structure formed by sequentially connecting and welding at least three sections of composite pipes, and the independent tee structure is an internally communicated tee structure formed by welding the ends of the three sections of composite pipes together;

the composite pipe is formed by coaxially embedding an inner layer and at least one outer layer together in a hot-melt co-extrusion manner; the outer layer is one or more layers of coaxial layered structures which are compositely nested together through hot melting coextrusion; the thickness of the inner layer is 1.0-10.0 mm, and the total thickness of the outer layer is 5.0-50.0 mm.

The outer layer is composed of 2-7 layers, and when the outer layer is composed of multiple layers, a fusion interface is formed at the contact part between the layers; the specific material composition of each layer may be the same or different.

The inner layer is a thermoplastic elastomer wear-resistant anti-corrosion material, preferably a thermoplastic elastomer TPE wear-resistant anti-corrosion material; the outer layer is made of reinforced modified high molecular polymer material, and mainly bears the internal pressure requirement of composite pipe medium conveying, the rigidity requirement of the pipeline, the span bending strength, the external force crushing, the external environment and the weather resistance requirement.

The elbow structure at least comprises a first section of pipe (11), a second section of pipe (12) and a third section of pipe (13), wherein one end part of the first section of pipe (11) is an inclined plane, and an included angle alpha between the inclined plane and a central shaft is 30-75 degrees; both ends of the second section of pipe (12) are oblique cutting surfaces, and the included angles alpha between the two oblique cutting surfaces and the central shaft are both 30-75 degrees; one end part of the third section of pipe (13) is an oblique cutting surface, and the included angle alpha between the oblique cutting surface and the central shaft is 30-75 degrees; the included angle between the oblique cutting plane of the second section of pipe (12) and the central shaft is equal to or unequal to the included angle between the oblique cutting plane of the first section of pipe (11) and the central shaft; the end part of the inclined plane of the first section of pipe (11) and the pipe wall of one end part of the inclined plane of the second section of pipe (12) are correspondingly welded together in a sealing way; the end part of the other inclined cut surface of the second section of pipe (12) is welded with the pipe wall of the end part of the inclined cut surface of the third section of pipe (13) correspondingly in a sealing way; the axial length of the second section of pipe (12) is set as required, and the pipe walls of the two end faces of the second section of pipe (12) are complete in the circumferential direction.

A plurality of second sections of pipes (12) which are welded together in series can be arranged between the first section of pipes (11) and the third section of pipes (13) according to the requirement, such as bending degree and the like.

The independent three-way pipe structure comprises a first communicating pipe (21), a second communicating pipe (22) and a third communicating pipe (23), wherein one end part of the first communicating pipe (21) is an oblique tangent plane, and the included angle between the oblique tangent plane and a central shaft is 180-beta degrees; the end part of one end of the second communicating pipe (22) is a tip formed by beveling two bevels A and B, the included angles beta between the bevels A and B and the central shaft are 75-150 degrees, and the intersecting line of the bevels A and B is positioned outside the pipe of the end of the second communicating pipe (22) and is vertical to but intersected with the central shaft; the end part of one end of the third communicating pipe (23) is a tip formed by beveling two bevels C and D, the included angles between the bevels C and D and the central shaft are 270-beta degrees, and the intersection line of the bevels C and D is positioned outside the pipe of the end of the third communicating pipe (23) and is vertical to but intersected with the central shaft; the oblique cutting surface A side of the second communicating pipe (22) and the oblique cutting surface D side of the third communicating pipe (23) are spliced into a plane, the plane is jointed and welded with the pipe wall corresponding to the end part of the oblique cutting surface of the first communicating pipe (21), the oblique cutting surface B side of the second communicating pipe (22) and the oblique cutting surface C side of the third communicating pipe (23) are jointed together, the corresponding pipe walls are jointed and welded together, the diameters of the first communicating pipe (21) and the second communicating pipe (22) are the same, the end part of the first communicating pipe (21) is butted with the central shaft of the end part of the second communicating pipe (22), the central shaft of the third communicating pipe (23) is vertical to the central shafts of the first communicating pipe (21) and the second communicating pipe (22), and the oblique cutting surfaces A, B, C, D are crossed into a straight line which is vertical to the central shafts of the three communicating pipes, the pipe wall butted between the first communicating pipe (21) and the second communicating pipe (22), the pipe, The pipe walls of the first communicating pipe (21) and the third communicating pipe (23) which are butted are welded together in a sealing way to form a three-way pipe structure.

The hot-melt welding angle of the mineral slurry conveying wear-resistant and corrosion-resistant composite pipe fitting is suitable for the installation and use requirements of a mineral slurry conveying wear-resistant and corrosion-resistant composite pipe, the requirements of the composite pipe fitting on the shape and the angle size of a field are met, and the purpose of pipe connection is achieved through a hot-melt welding mode. Simultaneously this application elbow structure first section pipe (11), second section pipe (12), the scarf angle that third section pipe (13) were established are according to thermal power plant wet flue gas desulfurization with the mechanical properties setting of mineral thick liquid conveying in-process fluid, can reduce the continuity of adjacent two pipe section welding corner fluid circulation as far as, and the pressure drop is few, and is as little as possible to the wearing and tearing of inner wall, accords with the installation demand simultaneously. The three-way pipe is cut according to a required design angle, each layer of the pipe is aligned in order without dislocation according to the angle requirement of the pipe fitting, and finally the pipe is formed through hot melting welding.

Drawings

FIG. 1 shows a composite pipe elbow structure

FIG. 2 shows a three-way structure of a composite pipe

Fig. 3 is a schematic cross-sectional structure of the composite pipe.

1 inner layer, 2 outer layer 1; 3, outside 2; 4, 3 outside; 5, outer 4; 11 a first section of tubing; 12 a second section of tubing; 13 a third section of tubing; 21 a first communicating pipe; 22 a second communication pipe; 23 a third communication pipe.

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.

Example 1

1. The inner layer of the wear-resistant anti-corrosion composite pipe fitting for conveying mineral slurry is made of a wear-resistant anti-corrosion thermoplastic elastomer (TPE) material (or other wear-resistant anti-corrosion materials), and the TPE material is obtained by blending and modifying a high-molecular elastomer and a thermoplastic. Including but not limited to wear-resistant and corrosion-resistant raw materials such as TPE (thermoplastic elastomer), other thermoplastic elastomers, or ultra-high molecular weight polyethylene (UHMWPE) formed by blending ethylene-propylene copolymer with metallocene-olefin polymer. The thickness range of the inner layer of the pipe fitting, namely the wear-resistant anti-corrosion thermoplastic elastomer TPE (or other wear-resistant anti-corrosion materials), is 1.0-10.0 mm, and the specific thickness is different according to the diameter of the composite pipe;

2. the mineral slurry conveying wear-resisting anticorrosive pipe fitting has outer layer of high molecular polymer, modified reinforced high strength and high rigidity polymer composite material, etc. (including but not limited to PP/PE, fiber or inorganic material reinforced PP/PE, weather resisting PP/PE, grafted PP/PE adhesive resin, etc.). The outer layer of the pipe fitting can be formed by one or more materials and one or more layers of composite coextrusion; the outer layer thickness of the composite pipe fitting is 5.0-50.0 mm, and the specific thickness is determined by the diameter size, the pressure grade and the like of the composite pipe fitting.

Designing the required intercepting angle of the composite pipe according to different requirements of the pipe fitting, and realizing the shape and performance requirements of different pipe fittings through different combinations and welding angles;

the design intercept angle (the included angle between an intercept line and the central line of the pipe) alpha of the wear-resistant anti-corrosion composite pipe fitting for conveying mineral slurry is 37.5-75 degrees; the intercepting shapes of various pipe fittings are triangular, rhombic, trapezoidal and the like, and are determined by various pipe fitting structure designs with different requirements;

taking an elbow and a tee as examples: the wear-resistant anti-corrosion composite pipe fitting-elbow (shown in figure 1) is formed by welding two sections of oblique pipes (alpha is 37.5-75 degrees) and one section of trapezoidal pipes (beta is 75-150 degrees) through hot melting; the composite pipe fitting, i.e. the equal-diameter tee or the different-diameter tee (the diameter of the first communicating pipe is equal to that of the second communicating pipe, but is not equal to that of the third communicating pipe) is formed by welding a section of oblique section pipe (alpha is 37.5-75 degrees) and two sections of triangular pipe (beta is 75-150 degrees) through hot melting (as shown in figure 2).

Claims

1. The mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization in a thermal power plant is characterized by being divided into an independent composite pipe elbow structure and a composite pipe tee structure, wherein the composite pipe elbow structure is an internally communicated elbow structure formed by sequentially connecting and welding at least three sections of composite pipes, and the independent tee structure is an internally communicated tee structure formed by welding the ends of the three sections of composite pipes together;

2. The mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of a thermal power plant according to claim 1, wherein the outer layer has 2-7 layers, and when the outer layer is a multilayer composite, a fusion interface is formed at the contact part between the layers; the specific material composition of each layer may be the same or different.

3. The mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of a thermal power plant according to claim 1, wherein the inner layer is made of thermoplastic elastomer wear-resistant and corrosion-resistant materials, the outer layer is made of reinforced and modified high polymer materials, and the inner pressure requirement, the rigidity requirement, the span bending strength, the external force crushing, the external environment requirement and the weather resistance requirement of composite pipe medium conveying are mainly borne.

4. The connection structure of the mineral slurry conveying wear-resistant and corrosion-resistant composite pipe for wet desulphurization of the thermal power plant according to claim 1, wherein the elbow structure at least comprises a first section of pipe (11), a second section of pipe (12) and a third section of pipe (13), one end part of the first section of pipe (11) is an oblique plane, and an included angle alpha between the oblique plane and a central shaft is 30-75 degrees; both ends of the second section of pipe (12) are oblique cutting surfaces, and the included angles alpha between the two oblique cutting surfaces and the central shaft are both 30-75 degrees; one end part of the third section of pipe (13) is an oblique cutting surface, and the included angle alpha between the oblique cutting surface and the central shaft is 30-75 degrees; the included angle between the oblique cutting plane of the second section of pipe (12) and the central shaft is equal to or unequal to the included angle between the oblique cutting plane of the first section of pipe (11) and the central shaft; the end part of the inclined plane of the first section of pipe (11) and the pipe wall of one end part of the inclined plane of the second section of pipe (12) are correspondingly welded together in a sealing way; the end part of the other inclined cut surface of the second section of pipe (12) is welded with the pipe wall of the end part of the inclined cut surface of the third section of pipe (13) correspondingly in a sealing way; the axial length of the second section of pipe (12) is set as required, and the pipe walls of the two end faces of the second section of pipe (12) are complete in the circumferential direction.

5. The mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of thermal power plants according to claim 4, characterized in that a plurality of second sections of pipes (12) which are welded together in series are arranged between the first section of pipe (11) and the third section of pipe (13) according to the required bending degree.

6. The mineral slurry conveying wear-resistant and corrosion-resistant composite pipe connecting structure for wet desulphurization of a thermal power plant according to claim 1, wherein the independent three-way pipe structure comprises a first communicating pipe (21), a second communicating pipe (22) and a third communicating pipe (23), one end of the first communicating pipe (21) is an oblique plane, and an included angle between the oblique plane and a central shaft is 180-beta degrees; the end part of one end of the second communicating pipe (22) is a tip formed by beveling two bevels A and B, the included angles beta between the bevels A and B and the central shaft are 75-150 degrees, and the intersecting line of the bevels A and B is positioned outside the pipe of the end of the second communicating pipe (22) and is vertical to but intersected with the central shaft; the end part of one end of the third communicating pipe (23) is a tip formed by beveling two bevels C and D, the included angles between the bevels C and D and the central shaft are 270-beta degrees, and the intersection line of the bevels C and D is positioned outside the pipe of the end of the third communicating pipe (23) and is vertical to but intersected with the central shaft; the oblique cutting surface A side of the second communicating pipe (22) and the oblique cutting surface D side of the third communicating pipe (23) are spliced into a plane, the plane is jointed and welded with the pipe wall corresponding to the end part of the oblique cutting surface of the first communicating pipe (21), the oblique cutting surface B side of the second communicating pipe (22) and the oblique cutting surface C side of the third communicating pipe (23) are jointed together, the corresponding pipe walls are jointed and welded together, the diameters of the first communicating pipe (21) and the second communicating pipe (22) are the same, the end part of the first communicating pipe (21) is butted with the central shaft of the end part of the second communicating pipe (22), the central shaft of the third communicating pipe (23) is vertical to the central shafts of the first communicating pipe (21) and the second communicating pipe (22), and the oblique cutting surfaces A, B, C, D are crossed into a straight line which is vertical to the central shafts of the three communicating pipes, the pipe wall butted between the first communicating pipe (21) and the second communicating pipe (22), the pipe, The pipe walls of the first communicating pipe (21) and the third communicating pipe (23) which are butted are welded together in a sealing way to form a three-way pipe structure.