Heat tracing system with efficient isolation structure
By introducing special-shaped rigid components into the heat tracing system to form an arched structure, the problems of poor heat transfer effect and loose insulation structure caused by the hollow in the traditional heat tracing system are solved, and more efficient heat transfer and more stable temperature control are achieved.
Patent Information
- Application Number
- CN202421917618.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-09
AI Technical Summary
There is a cavity in traditional heat tracing systems, resulting in poor heat transfer effect, loose insulation structure, easy collapse, and inability to effectively control the temperature.
A heat tracing system with an efficient isolation structure is designed. By providing a special-shaped rigid assembly on the outside of the heat tracing pipe, an arched structure is formed. The heat tracing pipe is arranged in the center of the special-shaped rigid assembly, and the two ends are bonded to the heat tracing pipe to form a fixed cavity to promote natural convection and heat transfer of air.
It improves heat transfer effect, reduces heat loss, maintains the compactness of the insulation structure, ensures the controllability of the temperature, and is suitable for temperature-sensitive media.
Smart Images
Figure CN222950682U_ABST
Abstract
Description
Technical field:
[0002] The utility model relates to the technical field of pipeline heating, in particular to a heating system with a high-efficiency isolation structure. Background technology:
[0004] Usually, the piping systems (including pipes, valves, brackets, instruments, tees, reducers, etc.) and equipment in petroleum and chemical plants often use external heating methods to maintain the temperature of the internal medium. For some special cases: 1) When heat-sensitive materials (such as amines, phenol water, etc.) or the heated pipe and the heated pipe are different in material (such as stainless steel pipes heated with carbon steel pipes), contact corrosion may occur; 2) For the heated pipes that will cause electrochemical corrosion or chemical corrosion due to local overheating, the industry standard recommends that the heating pipe and the heated pipe be laid in the form of an isolation block between them.
[0005] The heat tracing pipe is separated from the heat tracing pipe by an isolation block, and its outer layer is wrapped with thermal insulation cotton. There is a large cavity between the thermal insulation cotton and the heat tracing pipe. There are two reasons why the cavity exists in traditional heat tracing: 1) From the perspective of heat transfer principle, the reserved cavity can enhance the heat transfer and heating effect through natural convection of air in between. 2) From the perspective of construction, the traditional whole sheet of thermal insulation cotton is used to wrap the pipe as a whole, and a cavity will naturally be left after construction.
[0006] But the disadvantages of this form of isolated heating are also very obvious:
[0007] 1. According to the analysis of the principle of natural convection, there are a lot of narrow areas in the cavity. The Rayleigh number Ra is too low and the heat transfer effect is poor. The air convects naturally in a larger cavity, and the hot air in the cavity easily flows through the insulation gap to the outside of the insulation layer, causing heat loss.
[0008] 2. The insulation structure is relatively loose. After long-term use, the insulation partially collapses, causing the cavity to deform, resulting in uncontrollable heat transfer effect area and failure to meet heating requirements. Summary of the invention:
[0010] In order to eliminate the uncontrollable naturally formed cavities in the insulation layer and reserve controllable fixed cavities, improve the heat transfer effect, reduce heat loss, make the insulation structure dense, avoid collapse, and make the heat transfer effect area controllable, the utility model provides a heating system with a high-efficiency isolation structure, including an internal heated pipe, a heating pipe arranged on the outside of the heated pipe, and an external insulation layer wrapped around the outside of the heating pipe, characterized in that: a special-shaped rigid component is also arranged between the heated pipe and the heating pipe. The special-shaped rigid component is arched, the heating pipe is arranged at the vertex in the center of the arch of the special-shaped rigid component, the two ends of the arch of the special-shaped rigid component are attached to the heated pipe, a cavity is formed between the special-shaped rigid component and the heated pipe, and a natural air convection zone is formed in the cavity.
[0011] An arc-shaped groove is provided at the vertex of the arch center of the special-shaped rigid component, and the heating pipe is laid in the arc-shaped groove. The heating pipe fits tightly with the arc-shaped groove to ensure that the heat in the heating pipe is fully transferred to the cavity in the special-shaped rigid component.
[0012] Both ends of the arch of the special-shaped rigid component are provided with folded edges, the bottom of the folded edges is arc-shaped, and the folded edges are tightly fitted with the heated pipe.
[0013] The heated pipes around the special-shaped rigid components are also densely filled with a special-shaped cut insulation layer that fits the special-shaped rigid components.
[0014] The heating pipeline is filled with a heat source medium, and the heat source medium is one of water vapor, hot water, and heat transfer oil. The heat source medium flows in the heating pipeline to provide heat for the heated pipeline.
[0015] The heated pipe is filled with a heated medium, and the heated medium receives heat transferred from the heated pipe through the cavity, thereby maintaining a required temperature.
[0016] The special-shaped rigid component is made by bending a metal plate.
[0017] Baffles are arranged in the cavity at intervals in the longitudinal direction to divide the cavity into adjacent areas.
[0018] The number of the special-shaped rigid components is more than one, and if matched, the number of the heating pipes is the same as the number of the special-shaped rigid components.
[0019] The working principle of this heating method is:
[0020] In the natural convection zone, the heat transfer of the heating pipe is transferred to the heated pipe through the natural convection heat transfer of the air. Since the natural convection heat transfer coefficient of air is low, it can effectively play an isolating role, limit the wall temperature of the heated pipe, and play an isolating effect, so that the heated pipe will not be overheated. In special cases, the temperature distribution can be adjusted by filling the natural convection zone with heat conducting or heat insulating materials.
[0021] When the temperature of the heat source medium fluctuates, the existence of the natural convection zone can act as a buffer to reduce the temperature fluctuation of the heated pipe.
[0022] The natural convection heat transfer of air changes from the cavity naturally formed after the traditional heat tracing insulation wrapping to a natural convection area surrounded by a special-shaped rigid component and the heat tracing pipe. The size of the special-shaped rigid component is controllable, the heat transfer effect is better, and the heat loss is less. The insulation filling the innermost layer is cut so that there is no other cavity except the special-shaped pipe, and the heat loss is less.
[0023] The beneficial effects of the utility model are:
[0024] 1. The innermost layer of insulation is cut so that there is no other cavity except the special-shaped tube. The insulation structure is stable and is not adversely affected by insulation collapse.
[0025] 2. Enclosing the hot air in a fixed area greatly reduces the heat loss caused by the hot air flowing out of the insulation layer through natural convection.
[0026] 3. Calculated according to the principle of natural convection, temperature control is more controllable.
[0027] 4. The temperature distribution can be adjusted by filling the natural convection area with heat-conducting or heat-insulating materials
[0028] 5. When the temperature of the heat source fluctuates, the wall temperature of the heated pipe fluctuates less, which is suitable for temperature-sensitive media.
[0029] 6. Special-shaped rigid components can be made of the same material as the heated pipe to avoid corrosion caused by incompatibility of different materials.
[0030] 7. It can be made of thinner metal sheets, with lower manufacturing cost and difficulty.
[0031] The above 7 advantages make the heat tracing heat pipe of the present invention and similar products have significant advantages in the engineering field. Description of the drawings:
[0033] Figure 1 It is a cross-sectional schematic diagram of the utility model including a group of special-shaped rigid components.
[0034] Figure 2 It is a cross-sectional schematic diagram of the utility model including two sets of special-shaped rigid components.
[0035] Figure 3 It is a cross-sectional schematic diagram of the utility model including three groups of special-shaped rigid components.
[0036] Figure 4 It is a schematic diagram of the baffle of the utility model.
[0037] Figure ID:
[0038] 1. Heated pipe 2. Heating pipe 3. External insulation layer 4. Special-shaped rigid components
[0039] 5. Cavity 6. Arc-shaped slot 7. Folded edge 8. Heat source medium 9. Heat tracing medium
[0040] 10. Baffle 11. Special-shaped cutting insulation layer Specific implementation method:
[0042] like Figures 1 to 4 As shown, the utility model provides a heating system with a high-efficiency isolation structure, including an internal heated pipe 1, a heating pipe 2 arranged on the outside of the heated pipe 1, and an external insulation layer 3 wrapped around the outside of the heating pipe 2, wherein a special-shaped rigid component 4 is further arranged between the heated pipe 1 and the heating pipe 2.
[0043] The special-shaped rigid component 4 is arched, and the heating pipe 2 is arranged at the vertex in the center of the arch of the special-shaped rigid component 4. Both ends of the arch of the special-shaped rigid component 4 are attached to the heated pipe 1. A cavity 5 is formed between the special-shaped rigid component 4 and the heated pipe 1, and a natural air convection zone is formed in the cavity 5.
[0044] A circular arc groove 6 is provided at the vertex of the arch center of the special-shaped rigid component 4, and the heating pipe 2 is laid in the circular arc groove 6. The heating pipe 2 fits tightly with the circular arc groove 6 to ensure that the heat in the heating pipe 2 is fully transferred to the cavity 5 in the special-shaped rigid component 4.
[0045] Folding edges 7 are provided at both ends of the arch of the special-shaped rigid component 4 , the bottom of the folding edge 7 is arc-shaped, and the folding edge 7 is tightly fitted with the heated pipe 1 .
[0046] The heated pipe 1 around the special-shaped rigid component 4 is also densely filled with a special-shaped cut insulation layer 11 that fits the special-shaped rigid component 4 .
[0047] The heating pipe 2 is filled with a heat source medium 8 , and the heat source medium 8 is one of water vapor, hot water, and heat transfer oil. The heat source medium 8 flows in the heating pipe 2 to provide heat for the heated pipe 1 .
[0048] The heated pipe 1 is filled with a heated medium 9, and the heated medium 9 receives the heat transferred from the heated pipe 2 through the cavity 5, thereby maintaining a desired temperature.
[0049] The special-shaped rigid component 4 is made by bending a metal plate.
[0050] Baffles 10 are arranged in the cavity 5 at intervals in the longitudinal direction to divide the cavity 5 into adjacent areas.
[0051] The number of the special-shaped rigid components 4 is more than one, and if matched, the number of the heating pipes 2 is the same as the number of the special-shaped rigid components 4 .
[0052] Embodiment 1:
[0053] The heat source medium is hot water, with a water supply temperature of 95℃, a return water temperature of 70℃, and a pipe diameter of DN20; the heated pipe contains a flowing liquid, which is required to maintain a temperature of 60℃±5℃, and a pipe diameter of DN100; in order to prevent the heated pipe from overheating, a heating system with two sets of special-shaped rigid components with an efficient isolation structure is selected.
[0054] The above descriptions are only preferred specific embodiments of the present invention, which are all different implementation methods based on the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.
Claims
1. A heat tracing system with a high-efficiency isolation structure, comprising an internal heat tracing pipe (1), a heat tracing pipe (2) arranged outside the heat tracing pipe (1), and an external heat insulation layer (3) wrapped around the outside of the heat tracing pipe (2), wherein: A special-shaped rigid component (4) is further arranged between the heated pipe (1) and the heated pipe (2); the special-shaped rigid component (4) is arched; the heated pipe (2) is arranged at the vertex in the center of the arch of the special-shaped rigid component (4); both ends of the arch of the special-shaped rigid component (4) are attached to the heated pipe (1); a cavity (5) is formed between the special-shaped rigid component (4) and the heated pipe (1); and a natural convection zone of air is formed in the cavity (5); An arc-shaped groove (6) is provided at the vertex of the arched center of the special-shaped rigid component (4), the heating pipe (2) is laid in the arc-shaped groove (6), and the heating pipe (2) fits tightly with the arc-shaped groove (6), thereby ensuring that the heat in the heating pipe (2) is fully transferred to the cavity (5) in the special-shaped rigid component (4); Folding edges (7) are provided at both ends of the arch of the special-shaped rigid component (4), the bottom of the folding edge (7) is arc-shaped, and the folding edge (7) is tightly fitted to the heated pipe (1); The heated pipe (1) around the special-shaped rigid component (4) is also densely filled with a special-shaped cut-out thermal insulation layer (11) that fits the special-shaped rigid component (4).
2. The heat tracing system with a high-efficiency isolation structure according to claim 1 is characterized in that: The heating pipe (2) is filled with a heat source medium (8), wherein the heat source medium (8) is one of water vapor, hot water and heat transfer oil. The heat source medium (8) flows in the heating pipe (2) to provide heat for the heated pipe (1).
3. The heat tracing system with a high-efficiency isolation structure according to claim 1 is characterized in that: The heated pipe (1) is filled with a heated medium (9), and the heated medium (9) receives heat transferred from the heated pipe (2) through the cavity (5), thereby maintaining a required temperature.
4. The heat tracing system with a high-efficiency isolation structure according to claim 1 is characterized in that: The special-shaped rigid component (4) is made by bending a metal plate.
5. The heat tracing system with a high-efficiency isolation structure according to claim 1 is characterized in that: Baffles (10) are arranged at intervals in the longitudinal direction within the cavity (5) to divide the cavity (5) into adjacent areas.
6. The heat tracing system with a high-efficiency isolation structure according to claim 1 is characterized in that: The number of the special-shaped rigid components (4) is more than one, and the number of the heating pipes (2) and the special-shaped rigid components (4) are the same if matched.