CN210014103U

CN210014103U - Transition joint of liquefied natural gas pipeline

Info

Publication number: CN210014103U
Application number: CN201920557461.7U
Authority: CN
Inventors: 杨宇军; 夏金民; 黄志鸽; 王玉龙
Original assignee: ZHENGZHOU YUGUANG COMPOSITE MATERIALS CO Ltd
Current assignee: ZHENGZHOU YUGUANG COMPOSITE MATERIALS CO Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-02-04
Anticipated expiration: 2029-04-23

Abstract

The utility model relates to a liquefied natural gas pipeline transition joint, this transition joint comprises multiple metal explosive welding, stainless steel 304L layer is the basic unit, upper portion welding pure silver Ag layer, the pure titanium TA1 layer of upper portion welding on pure silver Ag layer, pure titanium TA1 layer upper portion welding pure aluminium 1100 or aluminum alloy 3A21 layer, pure aluminium 1100 or aluminum alloy 3A21 layer upper portion welding aluminum alloy 5083 layer, constitute the integral type structure, there is the loudspeaker form through-hole of downward open-ended in the center, the outside on aluminum alloy 5083 layer and stainless steel 304L layer is the step form of symmetry, aluminum alloy 5083 layer surface and receiving station vaporizer welding, stainless steel 304L layer surface and the stainless steel pipe welding of groove jar gas transmission. The utility model discloses simple structure, the easy production, pure silver Ag board has good electric conductive property, has not only improved titanium board explosive welding performance's stability, can effectual balanced electric potential moreover, prevents electrochemical corrosion, has guaranteed the security that liquefied natural gas pipeline transition joint used, has reduced daily maintenance repair cost.

Description

Transition joint of liquefied natural gas pipeline

Technical Field

The utility model relates to a transition joint, especially a liquefied natural gas pipeline transition joint.

Background

Liquefied Natural Gas (LNG) is liquefied natural gas at ultralow temperature of 162 ℃ and normal pressure to form liquefied natural gas, is clean and efficient energy and is mainly used in the fields of power plant power generation, heat energy, catering, chemical industry, transportation and other industries. The transportation mode of the liquefied natural gas mainly comprises the modes of steamships, trains, automobile tanks and the like, and the liquefied natural gas is gasified into the gas natural gas by a gasifier after being transported to a specified receiving station and is transported to a use unit. The tank outlet pipe is generally made of stainless steel, the gasifier is of an aluminum alloy 5083 structure, and the high-quality connection of the tank outlet pipe and the gasifier becomes a main problem about production safety.

At present, a common connection mode between a tank output pipeline and a gasifier is that the tank output pipeline and the gasifier are connected through an aluminum steel transition joint, the conventional aluminum steel transition joint is compounded by three layers of aluminum/titanium/stainless steel, and can be normally used under the working condition of ultralow temperature of 162 ℃ below zero, but under the condition of LNG (liquefied natural gas) with oxidability, a corrosion potential test result shows that the corrosion potential of the aluminum/titanium/stainless steel is between an aluminum composite layer and a stainless steel base layer, and under the condition of forming a corrosion battery, the aluminum alloy is seriously corroded, easily causes leakage and even explosion accidents, and the daily maintenance cost is high. Therefore, further innovation and improvement are needed in the construction of transition joints.

SUMMERY OF THE UTILITY MODEL

To the above situation, for solving prior art's defect, an object of the utility model is to provide a liquefied natural gas pipeline transition joint, can effectively solve traditional transition joint perishable, the problem that the routine maintenance is with high costs.

In order to realize the above-mentioned purpose, the technical scheme of the utility model is, a liquefied natural gas pipeline transition joint, this transition joint comprises multiple metal explosive welding, stainless steel 304L layer is the basic unit, upper portion welding pure silver Ag layer, pure titanium TA1 layer of upper portion welding on pure silver Ag layer, pure titanium TA1 layer upper portion welding pure aluminium 1100 or aluminum alloy 3A21 layer, pure aluminium 1100 or aluminum alloy 3A21 layer upper portion welding aluminum alloy 5083 layer, constitute the integral type structure, the center has downwardly opening's loudspeaker form through-hole, the outside on aluminum alloy 5083 layer and stainless steel 304L layer is the step form of symmetry, aluminum alloy 5083 layer surface and receiving station gasifier welding, stainless steel 304L layer surface and the stainless steel tube welding of tank gas transmission.

The utility model discloses simple structure, the easy production, pure silver Ag board has good electric conductive property, has not only improved titanium board explosive welding performance's stability, can effectual balanced electric potential moreover, prevents electrochemical corrosion, has guaranteed the security that liquefied natural gas pipeline transition joint used, reduces daily maintenance repair cost.

Drawings

Fig. 1 is a bottom view of the present invention.

Fig. 2 is a sectional elevation view of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

The utility model discloses when concrete implementation, combine the attached drawing to give, a liquefied natural gas pipeline transition joint, this transition joint comprises multiple metal explosive welding, stainless steel 304L layer 5 is the basic unit, upper portion welding pure silver Ag layer 4, pure silver Ag layer 4's upper portion welding pure titanium TA1 layer 3, pure titanium TA1 layer 3 upper portion welding pure aluminium 1100 or aluminum alloy 3A21 layer 2, pure aluminium 1100 or aluminum alloy 3A21 layer 2 upper portion welding aluminum alloy 5083 layer 1, constitute the integral type structure, there is downwardly opening's loudspeaker form through-hole 6 in the center, aluminum alloy 5083 layer 1 and stainless steel 304L layer 5's outside is the step form of symmetry, aluminum alloy 5083 layer 1 surface and receiving station vaporizer welding, stainless steel 304L layer 5 surface and the stainless steel tube welding of tank gas transmission.

In order to ensure better implementation effect, the thickness of the aluminum alloy 5083 layer 1 is not less than 20mm, the thickness of the pure aluminum 1100 or aluminum alloy 3A21 layer 2 is 4-6mm, the thickness of the pure titanium TA1 layer 3 is 1-3mm, the thickness of the pure silver Ag layer 4 is 1-3mm, and the thickness of the stainless steel 304L layer 5 is not less than 20 mm.

The thickness of the aluminum alloy 5083 layer 1 is the same as the thickness of the stainless steel 304L layer 5.

The central through hole of aluminum alloy 5083 layer 1 is straight circular, the through holes of aluminum alloy 3A21 layer 2, pure titanium TA1 layer 3, pure silver Ag layer 4 and stainless steel 304L layer 5 are inclined plane shapes with big end down and small end up, the caliber of the upper hole of pure aluminum 1100 or aluminum alloy 3A21 layer 2 is the same as the caliber of the lower hole of aluminum alloy 5083 layer 1, and a horn-shaped channel of the liquefied natural gas joint is formed.

The utility model is realized by the following method in production.

1. Preparation of welded metal material:

the thickness of the aluminum alloy 5083 is not less than 20mm, the thickness of the pure aluminum 1100 or the aluminum alloy 3A21 is 4-6mm, the thickness of the pure titanium TA1 is 1-3mm, the thickness of the pure silver Ag is 1-3mm, and the thickness of the stainless steel 304L is not less than 20 mm.

2. And (3) welding:

the close combination between two metal atoms is realized by adopting an explosive welding process method, the pure silver Ag and the stainless steel 304L are firstly subjected to explosive welding combination, and the explosive cladding between different metals is realized one by the same method.

3. Size processing and surface treatment:

and processing and removing the un-bonded area of the edge part, and performing turn-milling processing on the surface of the composite board to reach the use size, wherein the specific processing requirement is formulated according to the use environment.

4. And (3) penetration detection:

and (3) performing permeation detection on the composite interface by using a penetrant, a cleaning agent and a developer to ensure that the interface is free of defects.

5. Assembling and using:

the aluminum alloy surface of the transition joint of the liquefied natural gas pipeline is conventionally welded with the aluminum alloy of the receiving station gasifier, the stainless steel surface is conventionally welded with the stainless steel pipe for gas transmission of the tank, and the liquefied natural gas pipeline can be ventilated for use after the welding is finished and the inspection is qualified.

The utility model discloses an explosive welding obtains liquefied natural gas pipeline transition joint, has following advantage:

(1) pure aluminum 1100 is used as a transition layer, the Z-direction pull-off strength is not less than 80MPa, the aluminum/titanium interface shear strength is not less than 60MPa, the titanium/silver interface shear strength is not less than 140MPa, and the alloy can resist low temperature of-192 ℃;

(2) pure aluminum 1100 or aluminum alloy 3A21 is used as a transition layer, the Z-direction pull-off strength is not less than 137MPa, the aluminum/titanium interface shear strength is not less than 137MPa, the titanium/silver interface shear strength is not less than 140MPa, and the alloy can resist low temperature of-192 ℃;

(3) the pure silver Ag is used as the transition layer, so that the potential can be effectively balanced, the electrochemical corrosion is reduced, the stability of explosive bonding of the titanium plate is improved, the service life of the titanium plate is more than 5 times that of the titanium/stainless steel direct bonding, and the maintenance and replacement cost is effectively reduced.

Above can find out, the utility model discloses simple structure can be able to bear or endure the low temperature of-192 degrees centigrade, and can effectively solve under the condition that forms the corruption battery, and the aluminum alloy corrodes more seriously, causes the problem of leakage easily, has stopped the emergence of explosion accident, has reduced the cost of routine maintenance, and has prolonged filter joint's life, and life prolongs more than 5 times, has good society and economic benefits.

Claims

1. The transition joint is characterized by being formed by explosive welding of multiple metals, a stainless steel 304L layer (5) is a base layer, a pure silver Ag layer (4) is welded on the upper portion of the stainless steel 304L layer, a pure titanium TA1 layer (3) is welded on the upper portion of the pure silver Ag layer (4), a pure aluminum 1100 or an aluminum alloy 3A21 layer (2) is welded on the upper portion of the pure titanium TA1 layer (3), an aluminum alloy 5083 layer (1) is welded on the upper portion of the pure aluminum 1100 or the aluminum alloy 3A21 layer (2), an integrated structure is formed, a horn-shaped through hole (6) with a downward opening is formed in the center, the aluminum alloy 5083 layer (1) and the stainless steel 304L layer (5) are symmetrically stepped on the outer portions, the surface of the aluminum alloy 5083 layer (1) is welded with a receiving station gasifier, and the surface of the stainless steel 304L layer (5) is welded with a.

2. The lng pipeline transition joint of claim 1, wherein the thickness of the aluminum alloy 5083 layer (1) is not less than 20mm, the thickness of the pure aluminum 1100 or aluminum alloy 3a21 layer (2) is 4-6mm, the thickness of the pure titanium TA1 layer (3) is 1-3mm, the thickness of the pure silver Ag layer (4) is 1-3mm, and the thickness of the stainless steel 304L layer (5) is not less than 20 mm.

3. The lng pipeline transition joint of claim 1, wherein the thickness of the aluminum alloy 5083 layer (1) is the same as the thickness of the stainless steel 304L layer (5).

4. The liquefied natural gas pipeline transition joint as claimed in claim 1, wherein the central through hole of the aluminum alloy 5083 layer (1) is straight circular, the through holes of the aluminum alloy 3a21 layer (2), the pure titanium TA1 layer (3), the pure silver Ag layer (4) and the stainless steel 304L layer (5) are inclined plane-shaped with large lower part and small upper part, and the caliber of the upper hole of the pure aluminum 1100 or aluminum alloy 3a21 layer (2) is the same as the diameter of the lower hole of the aluminum alloy 5083 layer (1), thereby forming a flared passage of the liquefied natural gas pipeline joint.