CN113218094A

CN113218094A - Pipeline structure based on pile foundation pipe laying heat exchanger

Info

Publication number: CN113218094A
Application number: CN202110563083.5A
Authority: CN
Inventors: 阚玉红; 格日勒
Original assignee: Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd; MCC Capital Engineering and Research Incorporation Ltd
Current assignee: Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd; MCC Capital Engineering and Research Incorporation Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-08-06

Abstract

The invention provides a pipeline structure based on a pile foundation embedded pipe heat exchanger, and relates to the field of pile foundation embedded pipe heat exchange equipment. The pipeline structure based on the pile foundation buried pipe heat exchanger can reduce heat loss and improve heat exchange efficiency.

Description

Pipeline structure based on pile foundation pipe laying heat exchanger

Technical Field

The invention relates to the field of pile foundation pipe laying heat exchange equipment, in particular to a pipeline structure based on a pile foundation pipe laying heat exchanger.

Background

The fluid circularly flows through the heat conduction pipes with various shapes embedded in the pile foundation to exchange heat with the pile foundation and soil to form the pile foundation embedded pipe heat exchanger, namely the energy pile. Because the heat exchange tube is directly buried under the building, the underground area can be fully utilized, the system not only has the characteristics of energy conservation and environmental protection of a conventional system, but also reduces the drilling amount to a great extent and greatly reduces the initial investment. Meanwhile, the installation of the heat exchange pipeline and the construction of the building pile foundation are carried out synchronously, and the problems of long construction period, environmental damage and the like of the traditional buried pipe are avoided. Compared with the backfill material of the traditional drilling and pipe burying, the backfill material of the pile foundation pipe burying is concrete, the pipe burying, the pile foundation and the ground are in close contact with each other, the contact thermal resistance is small, and the heat transfer between the circulating liquid and the soil body is enhanced; in addition, the concrete pile base band has the steel reinforcement cage, and heat-conduction performance is better than the backfill material of traditional ground pipe laying, can effectively reduce pipe laying quantity. And, because the distance between the pile foundation is great, compare in traditional drilling buried pipe, can effectively alleviate the emergence of thermal interference between pipe laying self and the tube bank, heat transfer performance is more stable.

However, the existing energy pile systems also have their disadvantages: at present, an energy pile is generally manufactured by embedding a plastic heat exchange tube (mostly a PE tube) in a bored pile reinforcement cage, placing the PE heat exchange tube and the reinforcement cage into a pile well, and finally pouring concrete. The plastic heat exchange tube mainly has a single U-shaped structure, a parallel double U-shaped structure, a W-shaped structure and a spiral structure. Compared with a single U-shaped structure, the heat transfer area is increased in different degrees in other forms, but the influence on the heat exchange efficiency of the energy pile is limited. The PE plastic pipe has low compressive strength, influences the service life of the energy pile, and has small heat conductivity coefficient (lambda is 0.42 (w/m.k)), so that the heat exchange between the fluid in the pipe and the pile body outside the pipe is insufficient.

In view of the above, the inventor designs a pipeline structure based on a pile foundation heat exchanger through repeated experiments according to production design experiences in the field and related fields for many years, so as to solve the problems in the prior art.

Disclosure of Invention

The invention provides a pipeline structure based on a pile foundation buried pipe heat exchanger, which can reduce heat loss and improve heat exchange efficiency.

In order to achieve the purpose, the invention provides a pipeline structure based on a pile foundation embedded pipe heat exchanger, wherein the pipeline structure comprises a heat insulation input pipe, a heat exchange pipe and a heat insulation output pipe which are sequentially connected in series, the heat exchange pipe is embedded in pile foundation concrete, and the heat transfer coefficient of the heat exchange pipe is higher than that of the heat insulation input pipe and the heat insulation output pipe.

The pipeline structure based on the pile foundation pipe laying heat exchanger comprises an input pipe body, an insulating layer and a protective layer which are sequentially arranged from inside to outside.

The pipeline structure based on the pile-based borehole heat exchanger as described above, wherein the input pipe body is a seamless steel pipe.

The pipeline structure based on the pile-based pipe-laying heat exchanger is characterized in that the insulating layer is a rigid polyurethane foam insulating layer.

The pipe structure based on a pile-based borehole heat exchanger as described above, wherein the protective layer is a high density polyethylene protective layer.

The pipeline structure based on the pile foundation pipe-laying heat exchanger is characterized in that the heat exchange pipe is a copper-aluminum alloy pipe.

The pipeline structure of the heat exchanger based on the pile foundation and the buried pipe is characterized in that the heat exchange pipe adopts a single U-shaped buried pipe, a double U-shaped buried pipe, a W-shaped buried pipe or a spiral buried pipe.

The pipeline structure of the heat exchanger based on the pile foundation and the buried pipe is characterized in that a reinforcing pipe is sleeved outside each pipeline elbow of the heat exchange pipe.

The pipeline structure of the heat exchanger based on the pile foundation and the buried pipe as described above, wherein the reinforced pipe is a mineral wool pipe shell reinforced pipe.

The pipeline structure based on the pile foundation pipe-laying heat exchanger comprises a soil source heat pump and a circulating pump, wherein the soil source heat pump is provided with an output port and an input port, the heat preservation input pipe is connected with the output port through the circulating pump, and the heat preservation output pipe is connected with the input port.

Compared with the prior art, the pipeline structure based on the pile foundation heat exchanger has the following characteristics and advantages:

the pipeline structure based on the pile foundation embedded pipe heat exchange comprises a heat insulation input pipe and a heat insulation output pipe which form a heat insulation section, a heat exchange pipe forms a heat exchange section, and the heat transfer coefficient of the heat exchange pipe is higher than that of the heat insulation input pipe and the heat insulation output pipe; the heat exchange coefficients of the heat insulation input pipe and the heat insulation output pipe are small, and unnecessary energy loss of heat exchange media during conveying can be reduced.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

Fig. 1 is a schematic view of a first embodiment of a pipe structure for a pile-based borehole heat exchanger according to the present invention;

fig. 2 is a schematic view of a second embodiment of a pipe structure of a pile-based borehole heat exchanger according to the present invention;

fig. 3 is a schematic view of a third embodiment of a pipe structure of a pile-based borehole heat exchanger according to the present invention;

fig. 4 is a schematic view of a fourth embodiment of a pipe structure of a pile-based borehole heat exchanger according to the present invention.

Description of reference numerals:

100. a pipeline structure based on a pile foundation buried pipe heat exchanger; 10. A heat-preserving input pipe;

20. a heat exchange pipe;

30. a heat preservation output pipe; 40. Pile foundation concrete;

60. a ground source heat pump; 70. And a circulating pump.

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.

Referring to fig. 1 to 4, the present invention provides a pipeline structure 100 based on a pile foundation heat exchanger, where the pipeline structure 100 includes an insulation input pipe 10, a heat exchange pipe 20 and an insulation output pipe 30 connected in series in sequence, the heat exchange pipe 20 is embedded in pile foundation concrete 40, and a heat transfer coefficient of the heat exchange pipe 20 is higher than that of the insulation input pipe 10 and that of the insulation output pipe 30.

The pipeline structure 100 based on the pile foundation embedded pipe heat exchange comprises a heat insulation input pipe 10 and a heat insulation output pipe 30 which form a heat insulation section, a heat exchange pipe 20 forms a heat exchange section, and the heat transfer coefficient of the heat exchange pipe 20 is higher than that of the heat insulation input pipe 10 and the heat insulation output pipe 30; the heat-insulating input pipe 10 and the heat-insulating output pipe 30 have small heat exchange coefficients, and unnecessary energy loss during conveying of heat exchange media can be reduced.

In an alternative embodiment of the present invention, the heat-insulating input pipe 10 includes an input pipe body, a heat-insulating layer and a protective layer, which are sequentially arranged from inside to outside. The input tube body is used for carrying heat transfer medium, and the heat preservation is used for keeping warm to heat transfer medium, and the protective layer is used for providing support and protection to heat preservation, input tube body, improves heat preservation input tube 10's life.

In an alternative example of this embodiment, the input pipe body is a seamless steel pipe. Preferably, the input pipe body is a GB/8163 type seamless steel pipe.

In an alternative example of this embodiment, the insulation layer is a rigid polyurethane foam insulation layer. By adding the heat insulating material, the energy loss caused by the heat transfer medium in the transmission process is reduced.

In an alternative example of this embodiment, the protective layer is a high density polyethylene protective layer.

In an alternative example of this embodiment, the insulation input pipe 10 may be prefabricated in a factory, and the performance of the insulation input pipe should meet the industry standard "high density polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried insulation pipe and pipe fitting" GB/T29047-2012.

In the present invention, the structure of the output thermal insulation pipe 30 is the same as that of the input thermal insulation pipe 10, and will not be described herein.

In an alternative embodiment of the present invention, the heat exchange tube 20 is a copper aluminum alloy tube. The heat transfer coefficient is high (wherein, (4.5% Cu) λ 163(w/m · k)), and the compressive strength is good.

In an alternative embodiment of the present invention, the heat exchange tube 20 is a single U-shaped buried tube, a double U-shaped buried tube, a W-shaped buried tube or a spiral buried tube, and a reinforced tube is sleeved outside a pipe elbow of the heat exchange tube 20, so as to reasonably utilize the compensation capability of the bent tube and reduce the constraint of the pile body on the bent tube.

In an alternative example of this embodiment, the reinforced pipe is a mineral wool pipe shell reinforced pipe.

Preferably, the reinforcing pipe is formed by wrapping two layers of a 50 mm-thick mineral wool pipe shell and then binding the mineral wool pipe shell by using iron wires.

In an alternative embodiment of the present invention, the heat exchange pipe 20 is buried in the pile base concrete 40 to a predetermined depth.

Preferably, the heat exchange pipe 20 is buried at a position of 0.5m or less above the pile foundation concrete 40.

In an alternative embodiment of the present invention, the pipeline structure 100 based on the pile foundation heat exchanger further comprises a soil source heat pump 60 and a circulation pump 70, the soil source heat pump 60 has an output port and an input port, the output port is connected with the circulation pump 70 through a pipeline, the heat preservation input pipe 10 is connected with the circulation pump 70, and the heat preservation output pipe 30 is connected with the input port of the soil source heat pump 60.

In the invention, the pipeline connection adopts welding connection, impurities in the pipeline are required to be removed completely before welding, and welding and inspection are carried out according to the regulation and the requirement of 'urban heat supply pipe network engineering construction and acceptance standard' (CJJ28-2014) strictly, so that the welding quality is ensured.

Referring to fig. 1, in a first embodiment of a pipeline structure 100 of a heat exchange pipe based on a pile foundation and a buried pipe according to the present invention, a single U-shaped buried pipe is adopted as a heat exchange pipe 20. The heat preservation input pipe 10 and the heat preservation output pipe 30 are located at the position of more than 0.5m of the upper portion of the pile foundation and extend out of the pile foundation to be connected with the circulating pump 70 and the soil source heat pump 60, the seamless steel pipe GB/8163 is selected for the input pipe body, the heat preservation layer is made of rigid polyurethane foam plastics with the thickness of 50mm, the protective layer is made of high-density polyethylene materials, the structure of the heat preservation output pipe 30 is the same as that of the heat preservation input pipe 10, and repeated description is omitted here. The whole of the heat insulation input pipe 10 and the heat insulation output pipe 30 is prefabricated in a factory, and the performance of the heat insulation input pipe and the heat insulation output pipe should meet the industrial standard GB/T29047-2012 "high-density polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried heat insulation pipe and pipe fitting". The heat exchange tube 20 is embedded in the pile downward from 0.5m of the upper part of the pile foundation, the heat exchange tube 20 adopts a single U-shaped embedded tube, and two top ends of the heat exchange tube 20 are respectively connected with the heat preservation input tube 10 and the heat preservation output tube 30. The heat exchange tube 20 is a copper-aluminum alloy tube, and has a high thermal conductivity ((4.5% Cu) ═ 163(w/m · k)) and high compressive strength. The elbows on two sides of the bottom of the heat exchange tube 20 are provided with reinforcing tubes, the reinforcing tubes are formed by wrapping a 50mm thick mineral wool tube shell in two layers and are bound by iron wires, so that the compensation capacity of the elbow is reasonably utilized, and the restraint of a pile body on the elbow is reduced.

Referring to fig. 2, in a second embodiment of a pipeline structure 100 based on a pile foundation embedded pipe heat exchange pipe according to the present invention, a heat exchange pipe 20 is a parallel double U-shaped embedded pipe, the pipeline structure 100 is provided with two heat preservation input pipes 10 and two heat preservation output pipes 30, the heat preservation input pipes 10 and the heat preservation output pipes 30 are located at a position above 0.5m of the upper portion of the pile foundation and extend out of the pile foundation to be connected with a circulating pump 70 and a soil source heat pump 60, the input pipe body is a seamless steel pipe GB/8163, the heat preservation layer is made of rigid polyurethane foam with a thickness of 50mm, the protective layer is made of high density polyethylene, and the structure of the heat preservation output pipes 30 is the same as that of the heat preservation input pipes 10, which will not be described herein. The whole of the heat insulation input pipe 10 and the heat insulation output pipe 30 is prefabricated in a factory, and the performance of the heat insulation input pipe and the heat insulation output pipe should meet the industrial standard GB/T29047-2012 "high-density polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried heat insulation pipe and pipe fitting". Heat exchange tubes 20 are embedded in piles which are downward from 0.5m of the upper part of the pile foundation, and the heat exchange tubes 20 are parallel double-U-shaped embedded tubes. The heat exchange tube 20 is a copper-aluminum alloy tube, and has a high thermal conductivity ((4.5% Cu) ═ 163(w/m · k)) and high compressive strength. The elbows on two sides of the bottom of the heat exchange tube 20 are provided with reinforcing tubes, the reinforcing tubes are formed by wrapping a 50mm thick mineral wool tube shell in two layers and are bound by iron wires, so that the compensation capacity of the elbow is reasonably utilized, and the restraint of a pile body on the elbow is reduced.

Referring to fig. 3, in a third embodiment of the pipe structure 100 of the heat exchange pipe based on a pile foundation and a buried pipe according to the present invention, the heat exchange pipe 20 is a W-shaped buried pipe. The heat preservation input pipe 10 and the heat preservation output pipe 30 are located at the position of more than 0.5m of the upper portion of the pile foundation and extend out of the pile foundation to be connected with the circulating pump 70 and the soil source heat pump 60, the seamless steel pipe GB/8163 is selected for the input pipe body, the heat preservation layer is made of rigid polyurethane foam plastics with the thickness of 50mm, the protective layer is made of high-density polyethylene materials, the structure of the heat preservation output pipe 30 is the same as that of the heat preservation input pipe 10, and repeated description is omitted here. The whole of the heat insulation input pipe 10 and the heat insulation output pipe 30 is prefabricated in a factory, and the performance of the heat insulation input pipe and the heat insulation output pipe should meet the industrial standard GB/T29047-2012 "high-density polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried heat insulation pipe and pipe fitting". A heat exchange tube 20 is embedded in a pile downward from 0.5m of the upper part of the pile foundation, and the heat exchange tube 20 is a W-shaped embedded tube. The heat exchange tube 20 is a copper-aluminum alloy tube, and has a high thermal conductivity ((4.5% Cu) ═ 163(w/m · k)) and high compressive strength. The elbows on two sides of the bottom of the heat exchange tube 20 are provided with reinforcing tubes, the reinforcing tubes are formed by wrapping a 50mm thick mineral wool tube shell in two layers and are bound by iron wires, so that the compensation capacity of the elbow is reasonably utilized, and the restraint of a pile body on the elbow is reduced.

Referring to fig. 4, in a fourth embodiment of the pipe structure 100 of the heat exchange pipe based on a pile foundation and a buried pipe according to the present invention, the heat exchange pipe 20 is a spiral buried pipe. The heat preservation input pipe 10 and the heat preservation output pipe 30 are located at the position of more than 0.5m of the upper portion of the pile foundation and extend out of the pile foundation to be connected with the circulating pump 70 and the soil source heat pump 60, the seamless steel pipe GB/8163 is selected for the input pipe body, the heat preservation layer is made of rigid polyurethane foam plastics with the thickness of 50mm, the protective layer is made of high-density polyethylene materials, the structure of the heat preservation output pipe 30 is the same as that of the heat preservation input pipe 10, and repeated description is omitted here. The whole of the heat insulation input pipe 10 and the heat insulation output pipe 30 is prefabricated in a factory, and the performance of the heat insulation input pipe and the heat insulation output pipe should meet the industrial standard GB/T29047-2012 "high-density polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried heat insulation pipe and pipe fitting". A heat exchange tube 20 is embedded in a pile downward from 0.5m of the upper part of the pile foundation, and the heat exchange tube 20 is a spiral embedded tube. The heat exchange tube 20 is a copper-aluminum alloy tube, and has a high thermal conductivity ((4.5% Cu) ═ 163(w/m · k)) and high compressive strength. The elbows on two sides of the bottom of the heat exchange tube 20 are provided with reinforcing tubes, the reinforcing tubes are formed by wrapping a 50mm thick mineral wool tube shell in two layers and are bound by iron wires, so that the compensation capacity of the elbow is reasonably utilized, and the restraint of a pile body on the elbow is reduced.

The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.

Claims

1. The utility model provides a pipeline structure based on pile foundation pipe laying heat exchanger which characterized in that, pipeline structure includes heat preservation input tube, heat exchange tube and the heat preservation output tube of order series connection, the heat exchange tube is pre-buried in pile foundation concrete, the heat transfer coefficient of heat exchange tube is higher than the heat transfer coefficient of heat preservation input tube with the heat preservation output tube.

2. A pipe structure according to claim 1 in which the insulating input pipe comprises, in order from the inside to the outside, an input pipe body, an insulating layer and a protective layer.

3. A pipe structure according to claim 2 in which the input pipe body is a seamless steel pipe.

4. A pipe structure according to claim 2 in which the insulation is rigid polyurethane foam insulation.

5. A pipe structure according to claim 2 in which the protective layer is a high density polyethylene protective layer.

6. A pipe structure according to claim 1 based on a pile foundation borehole heat exchanger, wherein the heat exchange tubes are copper aluminium alloy tubes.

7. A pipe structure according to claim 1 based on a pile foundation borehole heat exchanger, wherein the heat exchange tubes are single U-shaped boreholes, double U-shaped boreholes, W-shaped boreholes or helical boreholes.

8. A pipe structure according to claim 7 wherein the pipe bends of the heat exchange tubes are externally jacketed with a reinforcing tube.

9. A pipe structure according to claim 8 wherein the reinforcing pipe is a mineral wool pipe shell reinforcing pipe.

10. A pipeline structure according to claim 1 based on a pile-based borehole heat exchanger, the pipeline structure further comprising a soil source heat pump and a circulation pump, the soil source heat pump having an output and an input, the thermal insulation input pipe being connected to the output via the circulation pump, and the thermal insulation output pipe being connected to the input.