WO2018014608A1

WO2018014608A1 - Novel steel-tube energy-pile for improving utilization efficiency of shallow geothermal energy, and manufacturing method therefor

Info

Publication number: WO2018014608A1
Application number: PCT/CN2017/080630
Authority: WO
Inventors: 孟珍珠; 孔纲强; 周杨; 李春红
Original assignee: 河海大学
Priority date: 2016-07-18
Filing date: 2017-04-14
Publication date: 2018-01-25
Also published as: CN106223312A; CN106223312B

Abstract

A novel steel-tube energy-pile for improving the utilization efficiency of shallow geothermal energy, and a manufacturing method therefor. The novel steel-tube energy-pile for improving the utilization efficiency of shallow geothermal energy comprises a steel-tube pile (1), a heat transfer pipe (2), a heat transfer pipe sleeve tube (3), an air conditioning system, a semiconductor thermoelectric power-generating system and a semiconductor thermoelectric heat dissipation and power generating system (22); the air conditioning system comprises a heat exchanger (10); the liquid in the heat transfer pipe (2) first exchanges heat with the soil, then regulates, by means of the heat exchanger (10) provided above the heat transfer pipe (2), the indoor air temperature in a building; the power energy generated by the semiconductor thermoelectric power-generating system and generated by the semiconductor thermoelectric heat dissipation and power generating system (22) is supplied to a electrical device above the surface of the earth. This system, using semiconductor thermoelectric power generation technology, generates power by means of a temperature difference between the liquid in the heat transfer pipe (2) and the soil; the energy generated by the thermoelectric heat dissipation and power-generating system (22) supplies a driving force to an underground heat dissipation pipe, the energy generated by the thermoelectric power generating system supplies a driving force to a low-power water pump in the air conditioning system, thereby increasing the cycle flow speed of the liquid in the heat transfer pipe, improving the heat cycle efficiency and heat exchange efficiency of the heat transfer pipe of the energy pile.

Description

Novel steel pipe energy pile for improving shallow geothermal energy utilization efficiency and manufacturing method thereof

Technical field

The invention relates to a shallow geothermal energy utilization technology, and is mainly applicable to the technical field of steel pipe pile foundation, etc., in particular to a new steel pipe energy pile for improving the utilization efficiency of shallow geothermal energy and a manufacturing method thereof.

Background technique

Shallow geothermal energy, also known as shallow geothermal energy, is a low-grade renewable and clean energy source. It is one of the most internal thermal energy resources in the world under the current technical and economic conditions. At present, the development and utilization of shallow geothermal energy is mainly to directly use the characteristics of shallow soil constant temperature throughout the year, and use heat pump circulation to achieve the effect of heating or summer cooling of ground buildings. Ground-source heat pump technology is one of the most common forms of direct use of shallow geothermal energy. This technology utilizes the relatively stable temperature characteristics of underground soil, surface water, and groundwater, and can be regenerated by heat exchange with the earth as an energy storage body. Energy air conditioning system; this technical solution can replace traditional heating methods and air conditioning systems such as traditional boilers or municipal pipe networks to achieve energy saving and emission reduction. The underground buried heat transfer tube is the construction difficulty and investment focus of the ground source heat pump technology; and the underground heat transfer tube needs to occupy a large land area and underground space, resulting in high construction cost such as initial burial, which affects its large-scale application. . Combining the underground heat transfer pipe burying facility in the ground source heat pump technology with the traditional building pile foundation construction can effectively solve the construction steps of the special buried pipe and the underground space occupied by the underground heat transfer pipe, thereby greatly saving the project cost; The pile foundation structure with underground heat transfer tubes formed in the form of underground buried pipes is called energy piles (or energy piles, energy heat exchange piles). Energy pile technology is one of the most typical technical solutions for effectively utilizing shallow geothermal energy in recent years. Combined with the specific form of pile foundation structure, different types of energy piles for shallow geothermal energy heat transfer are produced (Refs. 1-16). .

The German invention patent "Energy pile for geothermal energy purpose iecombined heating and cooling systems, has collector tube including section that includes another section that transitions and runs circularly around the former section of collector tube" (DE102012013337) A1)".

Document 2: Tiroler

European and German invention patent "Energy pile (EP1486741 B1, DE50305842D1)" filed and authorized by Metallwerke Aktiengesellschaft and Armin Ing. Amann.

Document 3: German invention patent "Concrete pile foundation for absorbing geothermal energy, contains corrugated sleeve pipe (DE202004014113 U1)", which is applied for and authorized by Ing. Armin Amann, corresponding Other countries have patent license numbers: AT7887 U1.

Document 4: PCT patent "Pile with integral geothermal conduit loop retaining means (PCT/CA2010/001500)" filed and authorized by Alain Desmeules, corresponding national phase patent grant number: CA2683256 A1, EP2491183 A4, US8262322 B2, US20110091288 A1, WO2011047461 A1.

Document 5: Li Zhiyi, Zhang Quansheng, Zhang Huidong, Liu Jianguo and Ma Wei applied and authorized the Chinese invention patent “Spin-in wall post-grouting ground source thermal energy conversion prefabricated pile device and its method of embedding the stratum (Patent No.: CN201210054121. 5), Authorization Announcement Date November 26, 2014".

Document 6: Kong Gangqiang, Huang Xu, Ding Xuanming, Liu Hanlong and Peng Huaifeng applied for and granted the Chinese invention patent “a hexagonal prefabricated energy pile and its manufacturing method, (patent number: CN201310442139.7), authorized announcement date August 2015 19th."

Document 7: Kong Gangqiang, Huang Xu, Ding Xuanming, Liu Hanlong and Peng Huaifeng applied for and granted the Chinese invention patent “a construction method for prefabricated energy piles (Patent No.: CN201310441978.7), Authorized Announcement Date September 23, 2015”.

Document 8: Huang Jiyong, Zheng Rongyue and Huang Nan applied for and granted the Chinese invention patent “A ground source heat pump tube embedding method based on the pile-pile process, (Patent No.: CN201310033136.8), Authorized Announcement Date September 23, 2015 day".

Document 9: Jiang Gang, Lu Hongwei, Wang Binbin and Liu Weiqing applied for and granted the Chinese invention patent “precast reinforced concrete pipe pile with ground source heat pump double spiral tubular heat exchanger, (patent number: CN201410572810.4), authorization announcement day January 20, 2016".

Document 10: The European invention patent "Geothermal pile having a cavity through which a fluid can flow", the corresponding national stage patent authorization number is: EP1243875 B1, NL1017655 C2, DE60200183 T2.

In Documents 1 to 9, a manufacturing method or a construction method for embedding different forms of underground heat transfer tubes in the middle of a precast pile, a side wall or even a precast pile body is disclosed. In Document 10, a construction method for closing the bottom end of a prefabricated pile and arranging an open underground heat transfer tube in the cavity of the prefabricated pile is disclosed.

Document 11: Fang Yihong and Liu Junhong applied for and authorized the Chinese invention patent “heat transfer model of pile-buried spiral tube ground source heat pump device and geothermal heat exchanger, (patent number: CN200810159583.7), authorization announcement date January 2011 26th."

Document 12: Zhang Yizhen, Zheng Zongyue and Li Wei and other Chinese invention patents “Ground source heat pump vertical spiral buried pipe construction method, (patent number: CN201210494997.1), authorized announcement day August 13, 2014”.

Document 13: Kong Gangqiang, Peng Huaifeng, Wu Hongwei and Ding Xuanming applied for and authorized the Chinese invention patent "a source Construction method of buried pipe in heat pump pouring pile reinforcement cage (Patent No.: CN201310302155.6), Authorized Announcement Date March 11, 2015".

Document 14: Liu Hanlong, Ding Xuanming, Kong Gangqiang, Wu Hongwei and Chen Yumin applied for and granted the Chinese invention patent “a PCC energy pile and its manufacturing method, (patent number: CN201210298385.5), authorized announcement date November 19, 2014”.

Document 15: Li Ping, Ding Xuanming, Gao Hongmei and Zheng Changjie applied for and granted the Chinese invention patent “a geothermal energy collection pile foundation and construction method, (patent number: CN201210476105.5), authorization announcement date April 8, 2015” .

In documents 11 to 13, a construction method in which a spiral type underground heat transfer tube or a heat transfer tube is embedded in a steel pipe is attached to a steel cage in a cast-in-place pile. In documents 14-15, a construction method for closing the bottom of a cast-in-place pile, filling a cavity with a heat transfer liquid, and arranging an open or underground heat transfer tube is disclosed.

Document 16: International method PCT patents "A method and system for installing geothermal heat exchangers, energy piles, concrete piles, and piles using a sonic drill and a removable or retrievable drill bit" (PCT/) applied by Raymond J. Roussy. CA2009/000180)", the corresponding national phase patent grant numbers are: CA2716209A1, CA2716209C, CA2827026A1, CA2827026C, CN102016218A, EP2247816A1, EP2247816A4, US8118115, US20090214299.

In Document 16, a method of embedding an underground heat transfer tube based on a new type of drilling machine is disclosed.

In summary, based on the different pile foundation construction techniques, the energy pile technology of different production methods or construction methods can be obtained; however, regardless of the buried tube form used in the pile foundation to improve the heat transfer efficiency, the shallow geothermal energy is The total energy storage capacity of a particular area and time period is certain; in other words, simply by increasing the number of buried heat transfer tubes, the heat transfer efficiency of the ground source heat pump technology cannot be increased without limitation.

In 1999, DiSalvo pointed out that based on semiconductor low-temperature temperature difference power generation technology, it can realize the thermoelectric conversion between subtle temperature differences (Ref. 17), thus effectively breaking the limitation of relative temperature difference to temperature difference power generation, and greatly broadening the types and channels of conversion of thermal energy into electric energy. It also makes it possible to convert low-grade shallow geothermal energy directly into electrical energy. In the literature 18, a technical method for cooling and heat transfer and thermal energy conversion based on the temperature difference between the deep geothermal energy of the high temperature underground rock tunnel structure and the external low temperature water is disclosed. However, the geothermal energy of the literature 18 belongs to the medium-high temperature geothermal energy and does not belong to the low-grade shallow geothermal energy category.

Document 17: Academic paper published by DiSalvo, F J. "Thermoelectric cooling and power generation." Science, 285.5428 (1999): 703-706.

Document 18: Chinese invention patents applied by Chen Guoqing, Yang Yang, Zhao Cong and Li Tianbin “A high-temperature tunnel cooling Heat dissipation and thermal energy conversion device (patent application number: CN201510663196.7).

In the literatures 19 to 20, a technical method for providing a heat source using solar energy and providing a cold source for generating a temperature difference using shallow geothermal energy is disclosed; in Document 21, a heat source and natural air using shallow geothermal energy are disclosed. Technical methods for providing cold source for temperature difference power generation; these technical methods play a good role in demonstrating the use of shallow geothermal energy for temperature difference power generation. However, the shallow geothermal energy in the literature 19-21 is that the shallow geothermal energy is first transferred to the liquid in the heat transfer tube through the heat transfer tube, and the heat is brought to the surface through the flow of the liquid in the heat transfer tube, and then The temperature difference between the temperature liquid and the temperature of the surrounding medium (solar or air) is used to generate electricity; this method has the following disadvantages: (1) It is also necessary to drill holes in the formation in advance, embed the heat transfer tubes, and occupy the occupied land area. And the problem of large underground space and high cost of initial buried facilities; (2) shallow geothermal energy is first transferred to the liquid in the heat transfer tube, and then the liquid in the heat transfer tube and other objects at different temperatures on the surface are used for temperature difference power generation, and the number of energy transmissions The increase will also lead to a decrease in energy utilization; (3) shallow geothermal energy does not directly undergo energy form transformation through the soil.

Document 19: US Patent Application "System for transferring heat in a thermoelectric generator system." U.S. Patent Application No. 10/871, 544.2005, filed and assigned by Mount, Robert.

Document 20: U.S. Patent No. 8,286,441.16 Oct. 2012, filed and granted by Simka, Pavel, entitled "System for collecting and delivering solar and geothermal heat energy with thermoelectric generator."

Document 21: Liu, Liping published an academic paper "Feasibility of large-scale power plants based on thermoelectric effects." New Journal of Physics 16.12 (2014): 123019.

Therefore, in view of the shortcomings and shortcomings of the current shallow geothermal energy utilization, which are limited by the total area and time period, combined with the technical advantages of semiconductor low temperature temperature difference power generation, a new energy pile technical solution that can effectively improve the utilization efficiency of shallow geothermal energy is developed. It is especially important.

Summary of the invention

OBJECT OF THE INVENTION: To overcome the above-mentioned deficiencies and shortcomings, solve the problem that (1) the total amount of shallow geothermal energy in the shallow geothermal energy utilization is limited in space and time, resulting in low heat exchange efficiency in shallow geothermal energy utilization. (2) In the shallow geothermal temperature difference power generation scheme, the drilling tunnel has high construction cost, occupied land area or large underground space, and does not utilize the temperature difference between the soil itself and the medium for direct power generation; Pipe pile foundation, shallow geothermal energy utilization and semiconductor thermoelectric power generation technology, propose a new type of steel pipe energy pile to improve the utilization efficiency of shallow geothermal energy and its technical solution; combined with the characteristics of steel pipe pile, through the steel pipe pile Different shapes on the inside or outside Heat transfer tube, heat transfer tube sleeve, semiconductor thermoelectric power generation system and semiconductor thermoelectric power generation cooling system, construct a new type of steel tube energy pile with power generation and improved shallow geothermal energy conversion function, except for power supply for surface electrical equipment In addition, not only can improve the thermal cycle efficiency of the air conditioning system, but also improve the heat exchange efficiency of the heat transfer tube in the ground, and indirectly increase the contact area between the heat transfer tube and the soil, improve the utilization of geothermal energy per unit area, and efficiently use green clean energy. Finally, the goal of energy saving and emission reduction is achieved.

Technical Solution: In order to achieve the above object, the present invention provides a novel steel pipe energy pile for improving the utilization efficiency of shallow geothermal energy, and the device comprises: steel pipe pile, heat transfer tube, heat transfer tube sleeve, air conditioning system, semiconductor thermoelectric power generation The system and the semiconductor temperature difference power generation heat dissipation system; wherein the air conditioning system comprises a heat exchange device, the heat exchange device is disposed above the heat transfer tube, wherein the liquid flow rate in the heat transfer tube is controlled by the water pump I and the valve, and the heat transfer tube is The liquid first exchanges heat with the soil, and then adjusts the indoor air temperature of the building through the upper heat exchange device; the semiconductor thermoelectric power generation system uses the temperature difference between the heat transfer tube and the soil to realize thermoelectric conversion, and the obtained electric energy is the surface. The power supply is provided by the electric equipment; the semiconductor temperature difference power generation heat dissipation system utilizes the temperature difference between the heat transfer tube and the underground heat pipe to realize the thermoelectric conversion, and the obtained electric energy supplies power to the surface electric equipment.

The semiconductor thermoelectric power generation system comprises a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a heat conductive filler, and the semiconductor thermoelectric power generation sheet is pasted on the inner side of the heat transfer tube sleeve by a thermal conductive silicone, and the heat transfer tube is arranged inside the heat transfer tube sleeve, and the semiconductor temperature difference power generation The heat-conducting filler is filled between the sheet and the heat transfer tube, and the thermoelectric conversion is realized by the temperature difference between the heat transfer tube and the soil, and the electric energy obtained by the semiconductor temperature difference is sequentially connected to the DC/DC converter by using the wire, and the battery is the surface electric equipment. Provide electricity supply.

The semiconductor temperature difference power generation heat dissipation system comprises an underground heat dissipation tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a heat transfer tube sleeve, wherein the semiconductor thermoelectric power generation sheet is pasted on the inner side of the heat transfer tube sleeve by a thermal conductive silicone, and the semiconductor temperature difference power generation sheet and The heat transfer tube is filled with a heat conductive filler, and the underground heat pipe is pasted on the outer side of the heat transfer tube sleeve through the heat conductive silicone. The liquid in the underground heat pipe is circulated by the water pump II, and the temperature difference between the heat transfer tube and the underground heat pipe is used to realize the thermoelectric conversion. The wires sequentially connect the electric energy obtained by the semiconductor thermoelectric power generation to the DC/DC converter, the storage battery, and provide the driving force for the water pump II.

The above semiconductor thermoelectric power generation chip is a semiconductor thermoelectric power generation chip commonly used in the prior art, and includes a hot end, a cold end, a P-type semiconductor, an N-type semiconductor, a metal piece, and a heat conducting plate.

The pile length, pile diameter, wall thickness and pile spacing of the steel pipe pile are designed according to the load requirements of the upper part of the support. In a preferred embodiment, the steel pipe pile has a pile length of 25 to 50 m, an outer diameter of 0.8 to 2.0 m, a wall thickness of 16 to 20 mm, and a pile spacing of 3.0 to 7.0 m.

The heat transfer tube is a polyethylene tube (also referred to as a PE tube), which is determined according to the length of the steel tube pile and the arrangement of the heat transfer tube buried tube; the heat transfer tube can be buried in the inner side wall of the steel tube pile or embedded in the steel tube pile The outer side wall; the heat transfer tube is in the form of a single U shape, a double U shape, a W shape or a spiral type or a combination thereof. In one embodiment, the heat transfer tube has an outer diameter of 25 to 50 mm, a wall thickness of 5 to 8 mm, and a length of 60 to 350 m.

The heat transfer tube sleeve is made of a steel plate of 6-10 mm thick, and has a cross-sectional shape of one of a trapezoidal shape or a rectangular shape or a circular shape. The cross-sectional size is determined according to the size of the heat transfer tube. Preferably, the side length is 35~65mm or diameter 35~65mm; the heat transfer tube sleeve arrangement is determined according to the heat pipe buried pipe form, and is arranged on the inner side wall or the outer side wall of the steel pipe pile, which is single U shape, double U shape, W shape or spiral Any one or several combinations of the types.

The water pump I is located at the surface of the earth, and its power is 0.55-1.2 kW; the valve is an electric two-way valve; and the heat exchange device is a fan coil in an air-conditioning device.

Preferably, in the semiconductor thermoelectric power generation system, the thermal conductivity of the thermal conductive silica gel is 0.6-1.5 W/(m·K), which has high bonding performance and superior thermal conductivity, and non-curing and non-conducting characteristics; The power of the pump II is 5~15w; the DC/DC converter is located on the ground surface, which is a step-up DC/DC converter; the battery is located on the ground surface, which is a lead storage battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery. One type; the heat conductive filler is any one or several of alumina or magnesia or zinc oxide or aluminum nitride or boron nitride or silicon carbide or fibrous high thermal conductive carbon powder or scaly high thermal conductive carbon powder or high thermal conductive cloth Combination of the wires; the wires are embedded in a thermally conductive silicone.

The underground heat pipe is a polyethylene pipe having an outer diameter of 10 to 20 mm, a wall thickness of 3 to 4 mm, a length of 5 to 15 m, and is wound around the heat transfer tube, and the water circulation flow in the underground heat pipe is provided by the water pump II. The DC/DC converter is a step-up DC/DC converter; the battery is one of a lead battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery; The DC converter and battery are placed on the inner side wall or the outer side wall of the steel pipe pile, and the underground heat-dissipating equipment protective cover is used for waterproof and anti-collision protection.

The invention further provides a method for manufacturing a new steel pipe energy pile for improving the utilization efficiency of shallow geothermal energy, comprising the following steps:

(1) According to the upper load, design and determine the pile outer diameter, wall thickness, pile length and pile spacing of the steel pipe pile; comprehensively consider the pile length, pile spacing, shallow geothermal energy reserves and energy demand of the upper air conditioning system, design The heat transfer tube is in the form of a buried tube; the heat transfer tube is in the form of a single U shape, a double U shape, a W shape or a spiral type; the heat transfer tube is arranged on the inner side wall of the steel pipe pile or The outer side wall of the steel pipe pile;

(2) According to the designed heat transfer tube buried pipe form, the heat transfer tube sleeve has a trapezoidal or rectangular or circular cross-sectional shape, and the cross-sectional size is determined according to the size of the heat transfer tube; Form according to heat transfer tube The form is determined and arranged on the inner side wall or the outer side wall of the steel pipe pile, and is a combination of any one or several of a single U shape, a double U shape, a W shape or a spiral shape; the thermal power generation piece is pasted by the thermal conductive silica gel The inner side wall and the wire of the heat pipe sleeve are buried in the surface of the heat conductive silica gel, and the heat transfer tube is arranged in the heat transfer tube sleeve, and then the heat conductive filler is backfilled between the heat transfer tube and the heat transfer tube sleeve;

(3) The heat transfer tube sleeve containing the heat transfer tube, the heat conductive filler, the thermoelectric power generation sheet, the thermal conductive silicone and the wire is welded to the inner side wall or the outer side wall of the steel tube pile according to the designed buried tube; The thermoelectric power generation piece is connected to a DC/DC converter and a battery located on the surface of the earth, and the electric energy obtained by the semiconductor thermoelectric power generation is supplied to the surface electrical equipment;

(4) According to the reserves of shallow geothermal energy and the energy demand of the upper air conditioning system, design the number and position of the temperature difference heat generation system; at the design position, the outer side wall of the heat transfer tube casing is wound around the underground heat pipe, and the underground heat pipe and water pump II. DC/DC converter, battery, thermoelectric power generation chip and heat transfer tube constitute a semiconductor temperature difference power generation heat dissipation system; wherein, the semiconductor temperature difference power generation heat dissipation system is arranged within 15m below the surface, and the underground heat dissipation in each semiconductor temperature difference power generation heat dissipation system The tube-wrapped heat transfer tube sleeve has a length of 2 to 5 m, and each of the steel tube piles is arranged with 1 to 3 semiconductor temperature difference power generation and heat dissipation systems.

Advantageous Effects: Compared with the existing conventional steel pipe piles, the steel pipe pile device of the present invention has the following four technical advantages:

(1) It can not only provide the bearing characteristics of supporting the upper load, but also effectively use the shallow geothermal energy to provide cooling or heating energy to the upper part (providing cold source in summer and providing heat source in winter); saving energy consumption of traditional air conditioning system and achieving energy saving row;

(2) The semiconductor temperature difference power generation heat dissipation system in the steel pipe pile can use the temperature difference between the underground heat pipe and the heat transfer liquid in the heat transfer tube to carry out the semiconductor temperature difference power generation, and the liquid circulation water pump in the underground heat pipe is converted by the DC/DC converter. II power supply, through the thermoelectric conversion consumes the heat of the high temperature liquid in the heat transfer tube to reduce the energy loss of the low temperature geothermal energy; thereby greatly increasing the number of buried heat transfer tubes in the unit volume of the soil and the amount of heat exchange per unit time;

(3) The temperature difference power generation system in the steel pipe pile can use the temperature difference between the liquid and the soil in the heat transfer tube to carry out the semiconductor temperature difference power generation, and after the conversion by the DC/DC converter, supply power to the small power circulating water pump II of the air conditioning system, thereby improving Thermal cycle efficiency, can also provide lighting for the upper building;

(4) The rigid heat transfer tube sleeve disposed inside or outside the steel pipe pile, especially in the spiral arrangement form, can effectively improve the contact friction between the steel pipe pile and the pile core soil or the surrounding soil of the pile, thereby Improve the vertical bearing capacity of steel pipe piles. The hard heat transfer tube sleeve can also realize the completion of heat transfer tube burying and steel pipe pile construction, and effectively protect heat transfer The pipe is not damaged during the process of driving the steel pipe pile.

The advantages and effects of the invention will be further described in the detailed description.

DRAWINGS

1 is a schematic view showing the arrangement structure of a steel pipe pile system in the present invention;

2 is a schematic view showing the embedding form of a heat transfer tube and a heat transfer tube sleeve in a steel pipe pile according to the present invention, wherein (a) to (d) represent heat transfer tubes, which are sequentially a single U shape, a double U shape, a W shape, and Spiral type; (e) ~ (f) represent heat transfer sleeves, which are in order of single U shape, double U shape, W shape and spiral type;

3 is a cross-sectional view of the AA in the embedded form of the heat transfer tube and the heat transfer tube sleeve in the steel pipe pile of the present invention, wherein (a) to (d) represent heat transfer tubes, which are sequentially single U-shaped and double U-shaped, W-shaped and spiral-shaped; (e)-(f) represent heat transfer sleeves, which are sequentially single U-shaped, double U-shaped, W-shaped and spiral-shaped;

Figure 4 is a perspective view showing the arrangement of a heat-dissipation heat-dissipating system for a steel pipe pile in the present invention;

Figure 5 is a cross-sectional view of the B-B arrangement of the heat-dissipation heat-dissipating system of the steel pipe pile in the present invention;

Figure 6 is a perspective view showing the arrangement of a thermoelectric power generation system for a steel pipe pile in the present invention;

Figure 7 is a cross-sectional view showing the arrangement C-C of the temperature difference power generation system of the steel pipe pile in the present invention;

Figure 8 is a perspective view of a heat transfer tube sleeve side wall temperature difference power generation system in a steel pipe pile according to the present invention;

Figure 9 is a cross-sectional view showing a side wall temperature difference power generation system of a heat transfer tube sleeve in a steel pipe pile according to the present invention;

In the figure: 1 is steel pipe pile, 2 is heat transfer pipe, 3 is heat transfer pipe casing, 4 is DC/DC converter, 5 is battery, 6 is wire, 7 is water pump II, 8 is water pump I, 9 For the valve, 10 is the heat exchange equipment, 11 is the underground heat pipe, 12 is the thermal silica gel, 13 is the semiconductor thermoelectric power generation chip, 14 is the hot end, 15 is the cold end, 16 is the P-type semiconductor, 17 is the N-type semiconductor, 18 For the metal sheet, 19 is a heat conducting plate, 20 is a heat conductive filler, 21 is a protective cover for underground heat dissipation equipment, and 22 is a heat dissipation system for temperature difference power generation.

detailed description

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the scope of protection of the present invention is not limited to the description of the embodiments.

The invention provides a novel steel pipe energy pile for improving the utilization efficiency of shallow geothermal energy, and the device comprises: a steel pipe pile, a heat transfer tube, a heat transfer tube sleeve, an air conditioning system, a semiconductor thermoelectric power generation system and a semiconductor temperature difference power generation heat dissipation system; The air conditioning system includes a heat exchange device, and the heat exchange device is disposed above the heat transfer tube. wherein the liquid flow rate in the heat transfer tube is controlled by the water pump I and the valve, and the liquid in the heat transfer tube is first exchanged with the soil body, and then exchanged through the upper portion. The heat device regulates the indoor air temperature of the building.

The semiconductor thermoelectric power generation system includes a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a heat conductive filler. The semiconductor thermoelectric power generation sheet is pasted on the inner side of the heat transfer tube sleeve by a thermal conductive silicone, and the heat transfer tube is disposed inside the heat transfer tube sleeve, and the semiconductor temperature difference power generation sheet and the transmission The heat pipe is filled between the heat pipes, the thermoelectric conversion is realized by the temperature difference between the heat transfer tube and the soil, and the electric energy obtained by the semiconductor temperature difference power generation is sequentially connected to the DC/DC converter by using the wire, and the battery supplies power to the surface electric equipment. .

The semiconductor temperature difference power generation heat dissipation system includes an underground heat pipe, a semiconductor temperature difference power generation piece, a thermal conductive silica gel and a heat transfer tube sleeve, wherein the semiconductor thermoelectric power generation piece is pasted on the inner side of the heat transfer tube sleeve by a thermal conductive silicone, the semiconductor temperature difference power generation piece and the heat transfer tube The heat-conducting filler is filled between, and the underground heat-dissipating tube is pasted on the outer side of the heat-transfer tube through the thermal silica gel. The liquid in the underground heat-dissipating tube is circulated by the water pump II, and the temperature difference between the heat-transfer tube and the underground heat-dissipating tube realizes thermoelectric conversion, and the semiconductor The electric energy obtained by the thermoelectric power generation is sequentially connected to the DC/DC converter, the battery, and provides the driving force for the water pump II.

The method for manufacturing a new type of steel pipe energy pile which can improve the utilization efficiency of shallow geothermal energy is described in detail below.

First, as shown in Figure 1, according to the upper load, design and determine the pile outer diameter, wall thickness, pile length and pile spacing of the steel pipe pile 1; comprehensive consideration of pile length, pile spacing, shallow geothermal energy reserves and upper air conditioning The system energy demand is designed to be in the form of a buried tube; the heat transfer tube 2 may be disposed on the inner side wall of the steel pipe pile 1, or may be disposed on the outer side wall of the steel pipe pile 1 (in this embodiment, disposed on the outer side wall) . Preferably, the steel pipe pile 1 has a pile length of 25 to 50 m, an outer diameter of 0.8 to 2.0 m, a wall thickness of 16 to 20 mm, and a pile spacing of 3.0 to 7.0 m (in this embodiment, the pile length is 40 m, and the outer diameter is 1.2m, wall thickness is 18mm, pile spacing is 5.0m); preferably heat transfer tube 2, which is polyethylene tube (also known as PE tube), its outer diameter is 25~50mm, wall thickness is 5~8mm, length is 60-350m (the outer diameter is 30mm, the wall thickness is 5mm, the length is 240m); preferably, the heat transfer tube 2 can be in the form of a single U-shaped, double U-shaped, W-shaped or spiral type. A combination of one kind or several kinds is shown in FIG. 2 and FIG. 3 (this embodiment is a W shape).

Next, the heat transfer tube sleeve 3 is fabricated according to the designed heat transfer tube 2, as shown in FIG. 2 and FIG. 3, the cross section of the heat transfer tube sleeve 3 is trapezoidal or rectangular or circular (this embodiment is Trapezoidal), the section size is determined according to the size of the heat transfer tube; the arrangement of the heat transfer tube sleeve 3 is determined according to the form of the heat transfer tube 2, and is arranged on the inner side wall or the outer side wall of the steel tube pile 1, which may be a single U shape or a double U One or a combination of one of a shape, a W shape, or a spiral type (W shape in this embodiment); the semiconductor thermoelectric power generation sheet 13 is pasted on the inner side wall of the heat transfer tube sleeve 3, the wire 6 by the thermal conductive silica gel 12 Buried in the surface of the heat conductive silica gel 12, the heat transfer tube 2 is disposed in the heat transfer tube sleeve 3, and then the heat conductive filler 20 is backfilled between the heat transfer tube 2 and the heat transfer tube sleeve 3; preferably the heat transfer tube The sleeve 3 is made of a steel plate of 6 to 10 mm thick (6 mm in this embodiment), and has a cross-sectional shape of one of a trapezoidal shape or a rectangular shape or a circular shape. The cross-sectional dimension is determined according to the size of the heat transfer tube, and has a side length of 35 to 65 mm or a diameter of 35 to 65 mm (in this embodiment, a trapezoid having a top side length of 35 mm, a lower curved side length of 50 mm, and a height of 40 mm).

Then, the prepared heat transfer tube sleeve 3 containing the heat transfer tube 2, the heat conductive filler 20, the semiconductor thermoelectric power generation sheet 13, the thermal conductive silicone 12 and the wire 6 is welded to the inner side of the steel pipe pile 1 according to the designed buried pipe form. a wall or an outer side wall; the semiconductor thermoelectric power generation chip 13 is connected to the DC/DC converter 4 and the battery 5 located on the ground through the wire 6, and the electric power generated by the semiconductor thermoelectric power is transmitted to the air conditioning system circulating water pump I8 to supply power or provide illumination for the upper building. Preferably, the water pump I8 is located at the surface of the earth, and its power is 0.55-1.2 kW. The embodiment is 1.0 kW; the valve 9 is an electric two-way valve; and the heat exchange device 10 is a fan coil in the air-conditioning apparatus.

Finally, the number and location of the thermoelectric power generation system and the thermoelectric power generation cooling system 22 are designed according to the reserves of shallow geothermal energy and the energy demand of the upper air conditioning system. As shown in Figures 4-7. Preferably, in the semiconductor thermoelectric power generation system, the thermal conductive silica gel 12 has a thermal conductivity of 0.6 to 1.5 W/(m·K) (1.0 W/(m·K) in the present embodiment), and has high bonding performance and superior strength. Thermal conductivity, no solidification, no conductivity; pump II 7, its power is 5 ~ 15w (10w in this example); DC / DC converter 4, located on the surface, for boost DC / DC conversion The battery 5 is located on the surface and is one of a lead storage battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery; the heat conductive filler 20 is aluminum oxide or magnesium oxide or zinc oxide or aluminum nitride or boron nitride or One or more combinations of silicon carbide or fibrous high thermal conductivity carbon powder or scaly high thermal conductivity carbon powder or high thermal conductivity cloth (this embodiment is a mixture of alumina and fibrous high thermal conductivity carbon powder); wire 6 is embedded in heat conduction Inside the silica gel. At the design position, the outer side wall of the heat transfer tube sleeve 3 is wound around the underground heat pipe 11, and the underground heat pipe 11, the water pump II 7, the DC/DC converter 4, the battery 5 and the heat transfer tube 2 are composed of a heat transfer tube 2 and The semiconductor temperature difference between the underground heat pipes 11 generates a heat dissipation system 22. Preferably, the semiconductor thermoelectric power generation heat dissipation system 22 is disposed within 15 m below the surface, as shown in FIGS. 8-9. The length of the heat transfer tube sleeve 3 wound by the underground heat pipe 11 in each semiconductor temperature difference heat generation system 22 is 2 to 5 m, and the underground heat pipe is a polyethylene tube having an outer diameter of 10 to 20 mm and a wall thickness of 3 to 4 mm, length 5 to 15 m (in this embodiment, the outer diameter is 10 mm, the wall thickness is 3 mm, and the length is 5 m), and the DC/DC converter 4 and the battery 5 in the semiconductor thermoelectric power generation heat dissipation system 22 are disposed in the steel pipe pile 1 The inner side wall or the outer side wall is protected by water and collision protection by the underground heat-dissipating device protective cover 21; each of the steel pipe piles 1 is arranged with one to three of the two semiconductor temperature difference power generation heat dissipation systems 22 in this embodiment.

The semiconductor thermoelectric power generation chip used in the present invention is a semiconductor thermoelectric power generation chip which is common in the prior art, and includes a hot end, a cold end, a P-type semiconductor, an N-type semiconductor, a metal piece, and a heat conducting plate.

The system adopts semiconductor temperature difference power generation technology, which uses the temperature difference between the liquid and the soil in the heat transfer tube to generate electricity. The electric energy generated in the temperature difference heat generation system provides driving for the underground heat pipe, and the electric energy generated by the thermoelectric system is the air conditioning system. The medium and small power pumps provide driving force, thereby increasing the liquid circulation flow rate in the heat transfer tubes, and improving the thermal cycle efficiency and heat exchange efficiency of the energy pile heat transfer tubes.

Claims

A novel steel pipe energy pile for improving shallow geothermal energy utilization efficiency, characterized in that: the steel pipe pile, the heat transfer tube, the heat transfer tube sleeve, the air conditioning system, the semiconductor thermoelectric power generation system and the semiconductor temperature difference power generation heat dissipation system; Wherein, the air conditioning system comprises a heat exchange device, the heat exchange device is arranged above the heat transfer tube, the liquid flow rate in the heat transfer tube is controlled by the water pump I and the valve, and the liquid in the heat transfer tube is first exchanged with the soil body, and then Adjusting the indoor air temperature of the building by the upper heat exchange device; the semiconductor thermoelectric power generation system uses the temperature difference between the heat transfer tube and the soil to realize thermoelectric conversion, and the obtained electric energy supplies power to the surface electric equipment; The semiconductor temperature difference power generation heat dissipation system utilizes the temperature difference between the heat transfer tube and the underground heat pipe to realize the thermoelectric conversion, and the obtained electric energy supplies power to the surface electric equipment.
The novel steel pipe energy pile according to claim 1, wherein the semiconductor thermoelectric power generation system comprises a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a heat conductive filler, and the semiconductor thermoelectric power generation sheet is pasted on the inner side of the heat transfer tube sleeve by a thermal conductive silicone. The heat transfer tube is arranged inside the heat transfer tube sleeve, and the heat conduction filler is filled between the semiconductor temperature difference power generation sheet and the heat transfer tube, and the thermoelectric conversion is realized by using the temperature difference between the heat transfer tube and the soil body, and the semiconductor temperature difference power generation is obtained by using the wire. The electrical energy is sequentially connected to the DC/DC converter, and the battery supplies power to the surface electrical equipment.
The novel steel pipe energy pile according to claim 1, wherein the semiconductor temperature difference power generation heat dissipation system comprises an underground heat pipe, a semiconductor thermoelectric power generation piece, a thermal conductive silica gel and a heat transfer tube sleeve, wherein the semiconductor thermoelectric power generation piece passes The thermal conductive silica gel is adhered to the inner side of the heat transfer tube sleeve, and the heat conduction filler is filled between the semiconductor temperature difference power generation sheet and the heat transfer tube, and the underground heat dissipation tube is pasted on the outside of the heat transfer tube sleeve through the thermal conductive silicone, and the liquid in the underground heat dissipation tube is circulated by the water pump II. The temperature difference between the heat transfer tube and the underground heat pipe realizes thermoelectric conversion, and the electric energy obtained by the semiconductor thermoelectric power generation is sequentially connected to the DC/DC converter and the storage battery by using the wire, and the driving force is provided for the water pump II.
The novel steel pipe energy pile according to claim 1, wherein the pile length, the pile diameter, the wall thickness and the pile spacing of the steel pipe pile are designed according to the support upper load requirement.
The novel steel pipe energy pile according to claim 1, wherein the heat transfer tube is a polyethylene pipe, which is determined according to the length of the steel pipe pile and the arrangement of the heat pipe buried pipe; the heat transfer tube can be buried in the steel The inner side wall of the pipe pile is embedded in the outer side wall of the steel pipe pile; the heat transfer pipe is in the form of a single U shape, a double U shape, a W shape or a spiral type or a combination thereof.
The novel steel pipe energy pile according to claim 1, wherein the heat transfer tube sleeve is made of a steel plate of 6 to 10 mm thick, and has a cross-sectional shape of one of a trapezoidal shape or a rectangular shape or a circular shape. The cross-sectional dimension is determined according to the size of the heat transfer tube; the heat transfer tube sleeve arrangement is determined according to the form of the heat transfer tube buried tube, and is arranged on the inner side wall or the outer side wall of the steel tube pile, and is single U-shaped, double U-shaped, W-shaped or spiral Any one or several combinations of the types.
The new steel pipe energy pile according to claim 1, wherein the water pump I is located at the surface of the earth and has a power of 0.55 to 1.2 kW; the valve is an electric two-way valve; and the heat exchange device is an air conditioner. Fan coils in the equipment.
The novel steel pipe energy pile according to claim 2, wherein in the semiconductor thermoelectric power generation system, the thermal conductivity of the thermal conductive silica gel is 0.6-1.5 W/(m·K), which has high bonding performance and super strong Thermal conductivity, and non-curing, non-conducting characteristics; pump II power is 5 ~ 15w; DC / DC converter is located on the surface, is a step-up DC / DC converter; battery is located on the surface, for lead batteries or lithium ions One of a battery or a lithium ion polymer battery or a nickel cadmium battery; the heat conductive filler is alumina or magnesia or zinc oxide or aluminum nitride or boron nitride or silicon carbide or fibrous high thermal conductivity carbon powder or scaly high thermal conductivity A combination of any one or more of carbon powder or a highly conductive cloth; the wire is embedded in a thermally conductive silicone.
The new steel pipe energy pile according to claim 3, wherein the underground heat pipe is a polyethylene pipe having an outer diameter of 10 to 20 mm, a wall thickness of 3 to 4 mm, a length of 5 to 15 m, and being wound around The outside of the heat transfer tube, and the pump II provides power for circulating liquid in the underground heat pipe; the DC/DC converter is a step-up DC/DC converter; the battery is a lead battery or a lithium ion battery or lithium ion polymerization One of the storage battery or the nickel-cadmium storage battery; the DC/DC converter and the storage battery are disposed on the inner side wall or the outer side wall of the steel pipe pile, and are protected from water and collision by the underground heat-dissipating device protective cover.
A novel steel pipe energy pile manufacturing method for improving shallow geothermal energy utilization efficiency, characterized in that the method comprises the following steps:

(1) According to the upper load, design and determine the pile outer diameter, wall thickness, pile length and pile spacing of the steel pipe pile; comprehensively consider the pile length, pile spacing, shallow geothermal energy reserves and energy demand of the upper air conditioning system, design The heat transfer tube is in the form of a buried tube; the heat transfer tube is in the form of a single U shape, a double U shape, a W shape or a spiral type; the heat transfer tube is arranged on the inner side wall of the steel pipe pile or The outer side wall of the steel pipe pile;

(2) According to the designed heat transfer tube buried pipe form, the heat transfer tube sleeve has a trapezoidal or rectangular or circular cross-sectional shape, and the cross-sectional size is determined according to the size of the heat transfer tube; The form is determined according to the form of the heat pipe buried pipe, and is arranged on the inner side wall or the outer side wall of the steel pipe pile, and is a combination of any one or several of a single U shape, a double U shape, a W shape or a spiral type; The thermoelectric power generation sheet is pasted on the inner side wall of the heat transfer tube sleeve, the wire is buried in the surface of the heat conduction silica gel, and the heat transfer tube is disposed in the heat transfer tube sleeve, and then between the heat transfer tube and the heat transfer tube sleeve Backfilling the thermally conductive filler;

(3) Heat transfer sleeves containing heat transfer tubes, thermally conductive fillers, thermoelectric power generation sheets, thermal silica gel and wires The tube is welded to the inner side wall or the outer side wall of the steel pipe pile according to the designed buried pipe; the thermoelectric power generation piece is connected with the DC/DC converter and the battery located at the surface through the wire, and the electric energy generated by the semiconductor temperature difference is the surface electric equipment. powered by;

(4) According to the reserves of shallow geothermal energy and the energy demand of the upper air conditioning system, design the number and position of the temperature difference heat generation system; at the design position, the outer side wall of the heat transfer tube casing is wound around the underground heat pipe, and the underground heat pipe and water pump II. DC/DC converter, battery, thermoelectric power generation chip and heat transfer tube constitute a semiconductor temperature difference power generation heat dissipation system; wherein, the semiconductor temperature difference power generation heat dissipation system is arranged within 15m below the surface, and the underground heat dissipation in each semiconductor temperature difference power generation heat dissipation system The tube-wrapped heat transfer tube sleeve has a length of 2 to 5 m, and each of the steel tube piles is arranged with 1 to 3 semiconductor temperature difference power generation and heat dissipation systems.