CN101749518B - Infrared heater for coated joints of pipelines - Google Patents
Infrared heater for coated joints of pipelines Download PDFInfo
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- CN101749518B CN101749518B CN2008102277761A CN200810227776A CN101749518B CN 101749518 B CN101749518 B CN 101749518B CN 2008102277761 A CN2008102277761 A CN 2008102277761A CN 200810227776 A CN200810227776 A CN 200810227776A CN 101749518 B CN101749518 B CN 101749518B
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Abstract
The invention provides an infrared heater for coated joints of pipelines, which is suitable for heating of the coated joints of the pipelines, preheating before pipeline welding and heat treatment after pipeline welding. The invention relates to the technical field of pipeline systems. The infrared heater is of rectangular plate structure. In a shell covering five surfaces, the surface which is not covered is provided with a protecting net (17), a catalyst bed layer (18), an isolation layer (19) and a mixing chamber (20) from outside to inside in sequence. Heaters (6) are uniformly distributed in body frames (1) of a ring pipeline (7). Each heater (6) is provided with three heater nozzles (16) which are connected into the mixing chamber (20) and are respectively connected with an intake pipe of a gas guide pipe (15). The heater nozzles (16) are pipes with multiangular peripheries and are directly inserted into a bypass pipe orifice of the gas guide pipe (15).
Description
Technical field
The present invention a kind ofly is applicable to preheating before joint coating on pipeline heating and the pipeline welding, welds the infrared heater for coated joints of pipelines of after-baking.Relate to the pipe-line system technical field.
Background technique
Outer anticorrosion to buried pipeline, the measure of generally adopting is a coating protection at present.On-the-spot repaired mouth coating should have blending and continuity with pipe main body corrosion-inhibiting coating structure in theory as the important component part of whole coating system, two be coated with interlayer should form in conjunction with closely, seamlessly transit, even continuous safeguard structure.But in the on-the-spot field joint construction process, owing to be subjected to factor affecting such as weather conditions, construction equipment, workmen's technical merit, field joints coating technology control difficulty makes the repaired mouth difficult quality of site operation reach perfect condition than big of prefabrication more.The survey showed that for U.S. delivery safety office pipeline accident, and 45% pipeline accident is caused by the outer corrosion of pipeline, and most of outer corrosion occurs in the joint coating on pipeline place.This shows that joint coating on pipeline is to influence the most important key link of the final antiseptic property of whole pipe, therefore should further investigate, improve repaired mouth quality and reliability on-the-spot patch technology.
Pipeline generally adopts shrink belt (cover) repaired mouth both at home and abroad at present.During construction shrink belt (cover) is coated on the joint coating on pipeline place, then its skin is evenly heated the generation radial contraction, hose lining melts, and shrink belt (cover) is closely bonded together with body anticorrosive coat and repaired mouth steel tube surface reach the sealing corrosion effect.The flame gun manual mode of operation is all adopted in present domestic heat-contraction sleeve heating.The problem that this mode of heating exists mainly contains: the heat-contraction sleeve heating is inhomogeneous, and the temperature difference is big (particularly in the pipeline Lower Half), causes the burned or alice phenomenon of shrink sleeve easily; It is bigger that heating process is influenced by temperature; Time-consuming, labor strength is big, the operation easier height; The combustion efficiency and the energy transformation ratio of flame combustion mode are low, and the exhaust emission pollution environment that produces etc.The heat-contraction sleeve heating does not reach requirement, with directly causing the cohesive force and the peeling strength of heat-contraction sleeve to reduce, finally influences the pipeline corrosion protection quality.
Developed the heating plant that is used for pipeline thermal contraction bag band (cover) at present abroad.This equipment utilization catalytic combustion technology will carry out catalytic combustion after LPG and the air mixing, generate oxidation product and release heat.This equipment has greatly improved the combustion efficiency of fuel, and it is fast to have rate of heating, and the repaired mouth quality is good, and is pollution-free to anticorrosive coat, is convenient to characteristics such as carrying and installation.This equipment can be used for joint coating on pipeline heat-contraction sleeve heating under ditch, the ditch, also can be used for winter construction pipeline welding preceding preheating and postweld heat treatment.
The external used heater internal structure of heating plant is taked integral design, when carrying out the joint coating on pipeline heating, can only take to move the mode of heating along pipeline, to avoid the foaming phenomenon occurring in shrink belt (cover) heating process, but the travelling speed of heating plant and mobile at the uniform velocity property are difficult to manually control, and the repaired mouth quality has been caused bigger influence.
Summary of the invention
The objective of the invention is to invent a kind of infrared heater for coated joints of pipelines that improves joint coating on pipeline efficient and quality.
The present invention is the infrared heater supporting with infrared heating device for coated joints of pipelines, the general structure of this infrared heating device for coated joints of pipelines mainly is made up of main body frame 1, axial traveling and caliber controlling mechanism, heating system and gas control system as shown in Figure 1 and Figure 2.Two tool axial travelings and caliber controlling mechanism are installed in circumferential body framework 1 top that heating system is installed, and gas control system is installed in the bottom of main body frame 1; Gas control system has pipeline to communicate with heating system and controls the air inlet of heating system.
Circular or polygonal main body frame 1 is handled opening and closing by two hinges and an open-and-close mechanism 5, hoisting mechanism 4 is arranged at main body frame 1 top, in hoisting mechanism 4 both sides one axial traveling and caliber controlling mechanism are installed respectively, main body frame 1 inboard is equipped with the heating system that a plurality of LPG catalytic combustion infrared heaters 6, heater nozzle 16 and combustion gas air pipe 15 are formed, and the gas control system that is connected with combustion gas air pipe 15 by pipeline is installed in the bottom of main body frame 1.
The structure of heater 6 such as Fig. 3-shown in Figure 6, it is made up of a plurality of heaters 6, heater nozzle 16 and combustion gas air pipe 15.Heater 6 is rectangular flat structures, at the shell 21 of five of outsourcings, empty one side catch net 17, catalytic bed 18, separation layer 19, mixing chamber 20 are installed from outside to inside successively; So in the uniform main body frame 1 that is installed in endless tube road 7 of heater 6; Each heater 6 has 3 heater nozzles 16 to insert mixing chamber 20; After entering main body frame 1, be divided into 2 parallel pipes with the combustion gas air pipe 15 that the gas control system suction tude connects, converge into a muffler again after 1 one weeks enclosing main body frame, return gas control system from the indirect of 2 suction tude; 3 heater nozzles 16 of each heater 6 are connected with the suction tude of combustion gas air pipe 15 respectively; Heater 6 is taked LPG catalytic combustion infrared heating mode, controls its heating-up temperature and heated perimeter by gas control system, and weather and environment are less to its influence; Here combustion gas air pipe 15 is a rubber hose; Heater nozzle 16 (see figure 4)s are that periphery is polygonal pipeline section, directly insert in the bypass mouth of pipe of combustion gas air pipe 15;
Gas control system constitutes as shown in Figure 5, and it is made up of way switch in the heater 11, heater by-pass switch 12, pressure controlling of liquefied gas table 13, heater main switch 14.Be divided into two-way after connecing the heater main switch 14 of fuel gas source, the one tunnel connects the suction tude that connects combustion gas air pipe 15 behind the heater by-pass switch 12; Another road connects the muffler that connects combustion gas air pipe 15 in pressure controlling of liquefied gas table 13 and the heater behind the way switch 11.
Internal structure of the present invention adopts the piecemeal design, and promptly heater internal mix chamber is divided into three parts, respectively by three nozzle control air inlets.This design makes heating plant when carrying out the joint coating on pipeline heating, and by regulating the switch of the corresponding pressure regulator valve of three nozzles, the trizonal working state in control heater surface realizes that the zoning of shrink belt is heated step by step.Can prevent from the foaming phenomenon to occur in shrink belt (cover) heating process, can avoid the influence of personal factor again the repaired mouth quality.
As seen, that the present invention has is in light weight, compact structure, volume are little, repaired mouth efficient and quality advantages of higher, can be widely used in the joint coating on pipeline of different operating mode occasions and different tube diameters, has broad application prospects.
Description of drawings
Fig. 1 infrared heating device for coated joints of pipelines general structure front view
Fig. 2 infrared heating device for coated joints of pipelines general structure side view
Fig. 3 infrared heater front view
Fig. 4 infrared heater is surveyed view
Fig. 5 infrared heater axonometric drawing
Fig. 6 heater nozzle arrangements figure
1-main body frame, 2-folding hinge wherein
3-base, 4-hoisting mechanism
5-open-and-close mechanism, 6-heater
7-pipeline, 8-road wheel support
9-road wheel adjusting screw rod group, 10-road wheel
Way switch 12-heater by-pass switch in 11-heater
13-pressure controlling of liquefied gas table 14-heater main switch
15-combustion gas air pipe, 16-heater nozzle
17-catch net, 18-catalytic bed
19-thermal-protective coating, 20-mixing chamber
21-shell, 22-road wheel adjustment rack
Embodiment
Embodiment. this example is the above joint coating on pipeline infrared heating of a Φ 1000mm experimental prototype, and its general structure mainly is made up of main body frame 1, axial traveling and caliber controlling mechanism, heating system and gas control system as shown in Figure 1 and Figure 2.Two tool axial travelings and caliber controlling mechanism are installed in circumferential body framework 1 top that heating system is installed, and gas control system is installed in the bottom of main body frame 1; Gas control system has pipeline to communicate with heating system and controls the air inlet of heating system.
Become the main body frame 1 of 12 limit shapes to handle opening and closing by two hinges and an open-and-close mechanism 5, hoisting mechanism 4 is arranged at main body frame 1 top, in hoisting mechanism 4 both sides one axial traveling and caliber controlling mechanism are installed respectively, the inboard heating system of being made up of 6,36 heater nozzles 16 of 12 LPG catalytic combustion infrared heaters and combustion gas air pipe 15 of installing of main body frame 1, the gas control system that is connected with combustion gas air pipe 15 by pipeline is installed in the bottom of main body frame 1.
Wherein:
Main body frame 1 is by three sections integral body that constitute 12 limit shapes, it is divided into upper and lower two-part, top is one section 180 ° 6 limits, the bottom is for respectively being 90 ° two sections, each is connected the two ends on top by folding hinge 2 with an end of two sections of bottoms, and this other end of two sections is connected by open-and-close mechanism 5, and assurance lower half portion structure on two sides can be opened, so that the installation of heating plant and dismounting; Open-and-close mechanism 5 (see figure 3)s are inserting type structures, and the plug that is connected with spring cooperates with socket, and on the plug spanner is arranged; Two-part respectively are equipped with 6 heaters 6 up and down; Main body frame 1 central upper portion has hoisting mechanism 4; " ∏ " shape base 3 is arranged down at main body frame 1 bottom; Main body frame 1 adopts stainless steel material;
Main body frame 1 is the 12 limit shape frameworks of circumcircle Φ 1650mm;
Axial traveling and caliber controlling mechanism such as Fig. 6-shown in Figure 9, it is made up of four hyperbolic wheels of two tool axial travelings and caliber controlling mechanism, two pairs of hyperbolic wheel wheels are symmetrically arranged in pipeline upper surface center line both sides and form two " V " shape wheels, become 45 degree with pipeline upper surface center line, the longitudinal center line of hyperbolic wheels and pipeline 7 are tangent; Every tool axial traveling and caliber controlling mechanism become " gantry " shape, and adjust screw rod group 9 by the road wheel at road wheel support 8 and two ends and form " gantry " shape frame, the straight-bar below one end rectangularity of road wheel support 8, the other end is connected
The type hook; The lower end that road wheel is adjusted screw rod group 9 is connected with road wheel adjustment rack middle part hinge, the rectangular of road wheel adjustment rack upper end and road wheel support 8 belows one end and the other end
Type hook hinge connects, and road wheel 10 is arranged at the bottom; Road wheel is adjusted on screw rod group 9 (see figure 7)s adjustment screw rod group is housed respectively; Axial traveling and caliber controlling mechanism are seen Fig. 8 and Fig. 9 with being connected of main body frame 1; Be the rectangular and the other end of road wheel support 8 belows one end
Type hook and main body frame 1 vertical being connected;
Axial traveling and caliber controlling mechanism key dimension: road wheel support 8 length are 1400mm, and width is 40mm, highly are 120mm;
The structure of heating system such as Fig. 7-shown in Figure 9, it is made up of 12 heaters, 6,36 heater nozzles 16 and combustion gas air pipe 15.Heater 6 is rectangular flat structures, on 21 li on the shell of five of outsourcings, empty one side catch net 17, catalytic bed 18, separation layer 19, mixing chamber 20 are installed from outside to inside successively; Heater 6 is uniform to be installed in the main body frame 1 in endless tube road 7; Each heater 6 has 3 heater nozzles 16 to insert mixing chamber 20; After entering main body frame 1, be divided into 2 parallel pipes with the combustion gas air pipe 15 that the gas control system suction tude connects, converge into a muffler again after 1 one weeks enclosing main body frame, return gas control system from the indirect of 2 suction tude; 3 heater nozzles 16 of each heater 6 are connected with the suction tude of combustion gas air pipe 15 respectively; Heater 6 is taked LPG catalytic combustion infrared heating mode, controls its heating-up temperature and heated perimeter by gas control system, and weather and environment are less to its influence; Here combustion gas air pipe 15 is a rubber hose; Heater nozzle 16 (see figure 4)s are that periphery is polygonal pipeline section, directly insert in the bypass mouth of pipe of combustion gas air pipe 15;
Heater size is 370mm * 600mm * 150mm;
Gas control system constitutes as shown in Figure 5, and it is made up of way switch in the heater 11, heater by-pass switch 12, pressure controlling of liquefied gas table 13, heater main switch 14.Be divided into two-way after connecing the heater main switch 14 of fuel gas source, the one tunnel connects the suction tude that connects combustion gas air pipe 15 behind the heater by-pass switch 12; Another road connects the muffler that connects combustion gas air pipe 15 in pressure controlling of liquefied gas table 13 and the heater behind the way switch 11;
12 heater 6 uniform being installed in the endless tube road main body frame 1, can carry out even rapid heating to pipeline 7 interface left and right sides 700mm scopes, also can realize the centre of shrink belt (cover) and the priority of both sides are evenly heated, guarantee smooth and easy exhaust of shrink belt (cover) and evenly contraction.
When endless tube road main body frame 1 is opened, can implement installation and removal, can stride across the pipeline support pier smoothly when equipment is walked simultaneously on pipeline 7 equipment; Only need when closed framework open-and-close mechanism 5 is closed and can be carried out the anticorrosion construction operation to pipeline 7.
This heating equipment workflow is as follows:
1. heating equipment is placed on the pipeline 7 repaired mouth positions, adjust axial traveling and caliber controlling mechanism road wheel 10 to the appropriate location, heating equipment Lower Half both sides are closed and locked;
2. open way switch 11 and heater by-pass switch 12 in the heater;
3. adjust pressure controlling of liquefied gas table 13 to desired value, light heater 6 with igniter;
4. when pipeline 7 repaired mouth places reach predetermined temperature, close heater 6 switches, and heating equipment is pushed into outside pipeline 7 repaired mouths sentence;
5. at pipeline 7 repaired mouth places brush anti-corrosion primer;
6. after shrink belt (cover) being overlapped on request well, install support device in shrink belt (cover) below;
7. heating equipment is pushed back, make heating equipment and shrink belt (cover) central position over against;
8. open in the heater 6 way switch and light heater with igniter simultaneously;
9. when the surface temperature in the middle of the shrink belt (cover) reaches predetermined value, open heater by-pass switch 12, when heater 6 both sides are lighted, close way switch 11 in the heater, withdraw from shrink belt (cover) support device simultaneously;
10. when anticorrosion contraction bands (cover) both side surface temperature reaches predetermined value, close heater by-pass switch 12;
11. the joint coating on pipeline operation is finished, and heating equipment is pushed into pipeline 7 next repaired mouth positions.
This example is through test of many times, proves that it is in light weight, compact structure, volume be little, easy to use, and repaired mouth efficient and quality height can be widely used in the joint coating on pipeline of different operating mode occasions and different tube diameters, have broad application prospects.
Claims (1)
1. an infrared heater for coated joints of pipelines is characterized in that it is the rectangular flat structure, at the shell (21) of five of outsourcings, empty one side catch net (17), catalytic bed (18), separation layer (19), mixing chamber (20) are installed from outside to inside successively; This heater (6) is uniform to be installed in the main body frame (1) of endless tube road (7); Each heater (6) has 3 heater nozzles (16) to insert mixing chamber (20); 3 heater nozzles (16) of each heater (6) are connected with the suction tude of combustion gas air pipe (15) respectively; Heater nozzle (16) directly inserts in the bypass mouth of pipe of combustion gas air pipe (15) for periphery is polygonal pipeline section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102277761A CN101749518B (en) | 2008-12-02 | 2008-12-02 | Infrared heater for coated joints of pipelines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102277761A CN101749518B (en) | 2008-12-02 | 2008-12-02 | Infrared heater for coated joints of pipelines |
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| Publication Number | Publication Date |
|---|---|
| CN101749518A CN101749518A (en) | 2010-06-23 |
| CN101749518B true CN101749518B (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102277761A Active CN101749518B (en) | 2008-12-02 | 2008-12-02 | Infrared heater for coated joints of pipelines |
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| Country | Link |
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| CN (1) | CN101749518B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6071116A (en) * | 1997-04-15 | 2000-06-06 | American Air Liquide, Inc. | Heat recovery apparatus and methods of use |
| CN2553318Y (en) * | 2002-07-08 | 2003-05-28 | 孟庆连 | Resistance plate-type radiant-tube electric heater |
| CN201348116Y (en) * | 2008-12-02 | 2009-11-18 | 中国石油天然气股份有限公司 | Infrared heater for pipeline repaired mouth |
-
2008
- 2008-12-02 CN CN2008102277761A patent/CN101749518B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6071116A (en) * | 1997-04-15 | 2000-06-06 | American Air Liquide, Inc. | Heat recovery apparatus and methods of use |
| CN2553318Y (en) * | 2002-07-08 | 2003-05-28 | 孟庆连 | Resistance plate-type radiant-tube electric heater |
| CN201348116Y (en) * | 2008-12-02 | 2009-11-18 | 中国石油天然气股份有限公司 | Infrared heater for pipeline repaired mouth |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平9-14577A 1997.01.17 |
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| CN101749518A (en) | 2010-06-23 |
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Effective date of registration: 20211117 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100011 Beijing city Dongcheng District No. 16 Andrew intercontinental building Patentee before: PETROCHINA Co.,Ltd. |
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