Steam overhead composite thermal insulation pipe insulation support and its application

Abstract

The present invention provides a steam overhead composite thermal insulation pipe insulation support and its application, belonging to the technical field of pipeline equipment, the steam overhead composite thermal insulation pipe insulation support comprises an inner support, an outer support and a support seat, the inner support is connected to the working steel pipe of the thermal insulation pipe, the outer support is connected to the support seat, the inner support and the outer support are both provided with ribs, the ribs divide the space between the inner support and the outer support into a plurality of compartments, the compartments contain thermal insulation filling materials, and the thermal insulation filling materials are nano-silicon dioxide aerogel felt modified by expanded vermiculite. The steam overhead composite thermal insulation pipe insulation support of the present invention has excellent shock resistance, sliding properties and thermal insulation properties.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline equipment, and in particular relates to a steam overhead composite thermal insulation pipe insulation support and an application thereof. Background Art

[0002] The insulated pipe is composed of an internal medium pipe (working steel pipe), an intermediate insulation layer and an outer protective layer (outer protective pipe). It is widely used in chemical pipelines, central heating, central air-conditioning ventilation ducts, municipal engineering and other fields because of its low engineering cost, less heat loss, good anti-corrosion and insulation properties and convenient construction.

[0003] The traditional insulation pipe generally uses a rigid polyurethane foam plastic layer in the middle insulation layer. Rigid polyurethane foam is a new type of polymer composite material. It has the characteristics of good thermal insulation, light weight, low thermal conductivity, and small closed cell rate. Chinese invention patent CN110657316B announced a special bracket for overhead polyurethane insulation pipe in the pipe gallery and its construction method. Through the setting of internal and external brackets, the damage of the insulation layer and secondary insulation in the polyurethane insulation pipe laying project are avoided, and the insulation effect is good.

[0004] In order to further improve the thermal insulation effect of polyurethane materials, China's invention patent CN110594531B ​​announced a rigid polyurethane sprayed polyethylene wrapped prefabricated direct-buried thermal insulation pipe and its preparation method, which includes a steel pipe body, a polyurethane insulation layer, a rare earth connecting layer and an outer protective layer from the inside to the outside. The direct-buried thermal insulation pipe has good long-term heat resistance, uniform density, low shrinkage and good stability.

[0005] In recent years, aerogel materials have excellent thermal insulation properties, with thermal insulation effects 2-5 times that of traditional insulation materials. They are relatively hydrophobic and can effectively prevent moisture from entering pipes and equipment. They also have a unique three-dimensional mesh structure, which avoids deformation and sedimentation of other insulation materials during long-term use. In addition, aerogel materials are light and easy to cut, and can adapt to pipes and equipment of various shapes, bringing many conveniences to construction.

[0006] Therefore, in order to further improve the thermal insulation effect of the insulation layer and avoid secondary damage to the insulation layer and the outer protective pipe during the on-site installation of the insulation pipe, thereby further affecting the thermal insulation effect, improving and optimizing the insulation support structure and thermal insulation materials of the insulation pipe has always been the focus of researchers in this field; and aerogel materials, with their excellent performance, can replace traditional thermal insulation materials in the insulation support of the insulation pipe and is expected to achieve a significant improvement in the thermal insulation effect. Summary of the invention

[0007] In order to solve the above problems of the prior art, the present invention provides a steam overhead composite insulated pipe insulation bracket and its application, aiming to improve the thermal insulation performance of the insulation pipe. On the one hand, by combining the inner and outer brackets through bolts, secondary damage to the insulation layer and the outer protective pipe during the on-site erection of the insulation pipe is avoided, and the insulation effect is better, the construction is faster, and the cycle is shorter; on the other hand, by introducing insulation filling materials, better insulation effect is further achieved, reducing heat loss.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An overhead steam composite thermal insulation pipe insulation support, the overhead steam composite thermal insulation pipe insulation support comprises an inner support, an outer support and a support seat, the inner support is connected to the working steel pipe of the insulation pipe, the outer support is connected to the support seat, the inner support and the outer support are both provided with ribs, the ribs divide the space between the inner support and the outer support into a plurality of compartments, the insulation filling material is in the compartments, and the insulation filling material is nano-silicon dioxide aerogel felt modified with expanded vermiculite.

[0010] Furthermore, the inner bracket is provided with a first rib plate, and the outer bracket is provided with a second rib plate, the first rib plate faces the outer bracket, and the second rib plate faces the inner bracket, and the first rib plate and the second rib plate cooperate with each other to form the partition.

[0011] Furthermore, the inner bracket and the outer bracket are fixed by connecting bolts.

[0012] Furthermore, a polytetrafluoroethylene plate is provided at the bottom of the support seat.

[0013] Furthermore, the steam overhead composite thermal insulation pipe insulation support also includes a guide seat. When in use, the guide seat is installed on the infrastructure on both sides of the support seat.

[0014] Furthermore, the amount of expanded vermiculite in the thermal insulation filling material is 5-10wt.%.

[0015] Furthermore, the preparation method of the thermal insulation filling material is as follows:

[0016] (1) Preparation of nano-aerogel felt: nano-silica aerogel, polyurethane and silica sol are mixed and stirred to obtain a raw material slurry, and the solvent is evaporated by heating and vacuuming to obtain nano-silica aerogel felt;

[0017] (2) immersing the nano aerogel felt in water, adding expanded vermiculite, surfactant and coupling agent, and stirring to react;

[0018] (3) The aerogel felt is taken out and dried to obtain the thermal insulation filling material.

[0019] Furthermore, in step (1), the weight ratio of the nano-silica aerogel, polyurethane and silica sol is 10-60:10-50:5-30.

[0020] Furthermore, in step (2), the stirring reaction temperature is room temperature-80°C, and the stirring reaction time is 1-2h.

[0021] Furthermore, the surfactant is selected from one or more combinations of dodecyl sulfonate, alkyl alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and polycarboxylate; and the coupling agent is selected from silane coupling agent.

[0022] The present invention also provides the use of the above-mentioned steam overhead composite thermal insulation pipe insulation support in the thermal insulation pipe installation project.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The steam overhead composite insulated pipe insulation support of the present invention has a kind of earthquake resistance, sliding and heat insulation performance for the entire pipeline. The combination of the inner and outer brackets through bolts avoids secondary damage to the insulation layer and the outer protective pipe during the on-site erection of the insulation pipe, and the insulation effect is better, the construction is faster, and the cycle is shorter. In addition, by designing the sliding bottom plate of the inner base and adding a stainless steel plate to the joint of the polytetrafluoroethylene plate of the outer base, the friction force is greatly reduced; by adding a guide device, it is ensured that the running pipeline always expands in one direction, the movement direction of the pipeline is controlled, and the damage to the insulation layer due to the expansion of the pipeline is avoided;

[0025] (2) The thermal insulation filling material of the present invention is a nano-aerogel felt modified by expanded vermiculite. The new thermal insulation material obtained by controlling the amount of expanded vermiculite and improving the preparation process can achieve better thermal insulation effects. The introduction of the thermal insulation filling material into the steam overhead composite insulation pipe insulation support effectively reduces heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Middle AA section view;

[0028] Figure 3 for Figure 1 Middle BB section view.

[0029] The parts represented by the reference numerals in the figure are as follows:

[0030] 1-inner bracket, 2-outer bracket, 3-support seat, 4-rib plate, 5-partition, 6-thermal insulation filling material, 7-first rib plate, 8-connecting bolt, 9-polytetrafluoroethylene plate, 10-guide seat, 11-infrastructure. DETAILED DESCRIPTION

[0031] 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In order to better understand the purpose, structure and function of the present invention, the assembled hollow box retaining wall structure and the construction method thereof are further described in detail below in conjunction with the accompanying drawings.

[0035] As attached Figure 1-3 As shown, the present invention is an overhead composite insulated support for steam pipes, comprising an inner support 1, an outer support 2 and a support seat 3, wherein the inner support 1 is connected to a working steel pipe of the insulated pipe, and the outer support 2 is connected to the support seat 3, and both the inner support 1 and the outer support 2 are provided with ribs 4, and the ribs 4 divide the space between the inner support 1 and the outer support 2 into a plurality of compartments 5, and the compartments 5 are provided with insulating filling materials 6, and the insulating filling materials 6 are nano-silicon dioxide aerogel felt modified with expanded vermiculite.

[0036] Furthermore, the inner bracket 1 is provided with a first rib 7, and the outer bracket 2 is provided with a second rib, the first rib 7 faces the outer bracket 2, and the second rib faces the inner bracket 1, and the first rib 7 and the second rib cooperate with each other to form the partition 5.

[0037] Furthermore, the inner bracket 1 and the outer bracket 2 are fixed by connecting bolts 8 .

[0038] Furthermore, a polytetrafluoroethylene plate 9 is provided at the bottom of the support seat 3. During installation, the polytetrafluoroethylene plate is on the infrastructure, and the bottom plate of the support seat is on the polytetrafluoroethylene plate, so that the bottom plate of the support seat is in contact with the polytetrafluoroethylene plate, which greatly reduces the friction force. When the pipeline is in a working state, the friction coefficient can be less than 0.07, thereby reducing the constraint of friction resistance on thermal expansion displacement.

[0039] Furthermore, the steam overhead composite insulated pipe insulation support also includes a guide seat 10. When in use, the guide seat 10 is installed on the infrastructure 11 on both sides of the support seat 3. By installing the guide seat 10, it is ensured that the running pipeline always expands in one direction, controls the movement direction of the pipeline, and avoids damage to the insulation layer due to the expansion of the pipeline.

[0040] Example 1

[0041] A heat-insulating filling material, the preparation method is as follows:

[0042] (1) 30 g of nano-silica aerogel, 20 g of polyurethane and 10 g of silica sol were added to a 75% ethanol solution, and stirred to fully mix to obtain a raw material slurry; the raw material slurry was heated to 80° C., and the solvent was evaporated by vacuum to obtain a nano-silica aerogel felt;

[0043] (2) Take 20g of nano aerogel felt and immerse it in water, add 1g of expanded vermiculite, 0.05g of dodecyl sulfonate and 0.1g of silane coupling agent, and stir at room temperature for 2h;

[0044] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0045] Example 2

[0046] A heat-insulating filling material, the preparation method is as follows:

[0047] (1) Add 50 g of nano-silica aerogel, 10 g of polyurethane and 30 g of silica sol into a 75% ethanol solution, stir to fully mix, and obtain a raw material slurry; heat the raw material slurry to 80° C., evacuate the solvent, and obtain a nano-silica aerogel felt;

[0048] (2) Take 20g of nano aerogel felt and immerse it in water, add 1g of expanded vermiculite, 0.05g of dodecyl sulfonate and 0.1g of silane coupling agent, and stir at room temperature for 2h;

[0049] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0050] Example 3

[0051] A heat-insulating filling material, the preparation method is as follows:

[0052] (1) 10 g of nano-silica aerogel, 50 g of polyurethane and 30 g of silica sol were added to a 75% ethanol solution, and stirred to fully mix to obtain a raw material slurry; the raw material slurry was heated to 80° C., and the solvent was evaporated by vacuum to obtain a nano-silica aerogel felt;

[0053] (2) Take 20g of nano aerogel felt and immerse it in water, add 1g of expanded vermiculite, 0.05g of dodecyl sulfonate and 0.1g of silane coupling agent, and stir at room temperature for 2h;

[0054] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0055] Example 4

[0056] A heat-insulating filling material, the preparation method is as follows:

[0057] (1) Add 20 g of nano-silica aerogel, 20 g of polyurethane and 10 g of silica sol into a 75% ethanol solution, stir to fully mix, and obtain a raw material slurry; heat the raw material slurry to 80° C., evacuate the solvent, and obtain a nano-silica aerogel felt;

[0058] (2) Take 20g of nano aerogel felt and immerse it in water, add 2g of expanded vermiculite, 0.05g of dodecyl sulfonate and 0.1g of silane coupling agent, and stir at room temperature for 2h;

[0059] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0060] Example 5

[0061] A heat-insulating filling material, the preparation method is as follows:

[0062] (1) Add 20 g of nano-silica aerogel, 20 g of polyurethane and 10 g of silica sol into a 75% ethanol solution, stir to fully mix, and obtain a raw material slurry; heat the raw material slurry to 80° C., evacuate the solvent, and obtain a nano-silica aerogel felt;

[0063] (2) Take 20g of nano aerogel felt and immerse it in water, add 1.5g of expanded vermiculite, 0.05g of dodecyl sulfonate and 0.1g of silane coupling agent, and stir at room temperature for 2h;

[0064] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0065] Comparative Example 1

[0066] Compared with Example 1, the only difference is: 10g of nano-silica aerogel and 60g of polyurethane.

[0067] Comparative Example 2

[0068] Compared with Example 1, the only difference is: 50g of nano-silica aerogel and 8g of polyurethane.

[0069] Comparative Example 3

[0070] Compared with Example 1, the only difference is that the amount of expanded vermiculite is 0.5g.

[0071] Comparative Example 4

[0072] Compared with Example 1, the only difference is that the amount of expanded vermiculite is 2.5 g.

[0073] Comparative Example 5

[0074] Compared with Example 1, the only difference is that the expanded vermiculite is replaced by an equal amount of expanded perlite.

[0075] Comparative Example 6

[0076] Compared with Example 1, the only difference is that the expanded vermiculite is replaced by an equal amount of glass microspheres.

[0077] Comparative Example 7

[0078] Compared with Example 1, the difference is that the preparation method is different, as follows:

[0079] (1) Add 0.05 g of dodecyl sulfonate and 0.1 g of silane coupling agent into water and stir to dissolve to obtain solution 1;

[0080] (2) adding 30 g of nano-silica aerogel to solution 1 of step (1), stirring and mixing evenly, adding 1 g of expanded vermiculite, and continuing to stir and react at room temperature for 2 h to obtain a modified aerogel felt;

[0081] (3) Take out the aerogel felt and dry it in vacuum at 80°C for 5 hours.

[0082] The thermal conductivity of the thermal insulation filling materials prepared in each embodiment and comparative example was tested according to GB / T5990-2006. The results are shown in Table 1.

[0083] Table 1

[0084] Thermal conductivity W / m·k (10℃) Example 1 0.015 Example 2 0.018 Example 3 0.017 Example 4 0.018 Example 5 0.017 Comparative Example 1 0.022 Comparative Example 2 0.020 Comparative Example 3 0.023 Comparative Example 4 0.025 Comparative Example 5 0.024 Comparative Example 6 0.027 Comparative Example 7 0.032

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A steam overhead composite thermal insulation pipe insulation support, characterized in that: The steam overhead composite thermal insulation pipe insulation support comprises an inner support, an outer support and a support seat, wherein the inner support is connected to the working steel pipe of the thermal insulation pipe, the outer support is connected to the support seat, and the inner support and the outer support are both provided with ribs, and the ribs divide the space between the inner support and the outer support into a plurality of compartments, wherein the compartments contain thermal insulation filling materials, and the thermal insulation filling materials are nano-silicon dioxide aerogel felt modified with expanded vermiculite; The preparation method of the thermal insulation filling material is as follows: (1) Preparation of nano-aerogel felt: nano-silica aerogel, polyurethane and silica sol are mixed and stirred to obtain a raw material slurry, and the solvent is evaporated by heating and vacuuming to obtain nano-silica aerogel felt; (2) immersing the nano-aerogel felt in water, adding expanded vermiculite, surfactant and coupling agent, heating and stirring to react; (3) taking out the aerogel felt and drying it to obtain the thermal insulation filling material; The weight ratio of the nano-silicon dioxide aerogel, polyurethane and silica sol is 10-60:10-50:5-30; The amount of expanded vermiculite in the thermal insulation filling material is 5-10 wt.%.

2. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: The inner bracket is provided with a first rib plate, and the outer bracket is provided with a second rib plate, the first rib plate faces the outer bracket, and the second rib plate faces the inner bracket, and the first rib plate and the second rib plate cooperate with each other to form the partition.

3. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: The inner bracket and the outer bracket are fixed by connecting bolts.

4. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: A polytetrafluoroethylene plate is arranged at the bottom of the support seat.

5. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: The steam overhead composite thermal insulation pipe insulation support also includes a guide seat. When in use, the guide seat is installed on the infrastructure on both sides of the support seat.

6. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: The amount of expanded vermiculite in the thermal insulation filling material is 5-10 wt.%.

7. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: In step (2), the stirring reaction temperature is from room temperature to 80°C, and the stirring reaction time is 1-2h.

8. The steam overhead composite thermal insulation pipe insulation support according to claim 1, characterized in that: The surfactant is selected from one or more combinations of dodecyl sulfonate, alkyl alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and polycarboxylate; and the coupling agent is selected from silane coupling agent.

9. An application of the steam overhead composite insulated pipe insulation support according to any one of claims 1 to 8 in an insulated pipe installation project.

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