WO2018014607A1

WO2018014607A1 - Combined cooling heating power diaphragm wall apparatus and construction method therefor

Info

Publication number: WO2018014607A1
Application number: PCT/CN2017/080628
Authority: WO
Inventors: 孟珍珠; 孔纲强; 周杨; 周航
Original assignee: 河海大学
Priority date: 2016-07-18
Filing date: 2017-04-14
Publication date: 2018-01-25
Also published as: CN106168418B; CN106168418A

Abstract

Provided is a combined cooling heating power diaphragm wall apparatus and a construction method therefor, the apparatus comprising: a diaphragm wall (1), a heat exchange pipe (2) arranged inside the diaphragm wall (1), an air conditioning system, and a thermoelectric power generation system. The heat exchange pipe (2) firstly exchanges heat with the soil, and then exchanges heat with indoor air by means of an upper heat exchange apparatus (7), so as to adjust room temperature; in the thermoelectric power generation system, a semiconductor thermoelectric power generation apparatus I (3) achieves thermoelectric conversion and heat exchange by utilizing a temperature difference between the heat exchange pipe (2) and a soil body at a pile side. A semiconductor thermoelectric power generation apparatus II (4) achieves thermoelectric conversion and heat exchange by utilizing a temperature difference between neighboring heat exchange pipes (2), and uses the obtained electric power for the electric power supply of upper power-consuming equipment (11), respectively. The provided combined cooling heating power diaphragm wall apparatus may effectively achieve composite utilization of the diaphragm wall (1) in three aspects: mechanics, thermology and electricity, and achieves multi-target effective utilization of shallow geothermal energy on demand and on staggered working hours, thereby improving energy-utilization efficiency.

Description

Cold and heat electricity cogeneration underground wall device and construction method thereof

Technical field

The invention relates to a shallow geothermal energy utilization technology, which is mainly applicable to the technical field of building underground continuous walls, and particularly relates to a cold and cogeneration underground continuous wall device and a construction 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 heat exchange tube is the construction difficulty and investment focus of the ground source heat pump technology; and the underground heat exchange 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 exchange pipe burying facility in the ground source heat pump technology with the underground building construction such as the traditional building pile foundation or the underground continuous wall can effectively solve the construction steps of the special buried pipe and the underground space occupied by the buried pipe, thus greatly Saving engineering cost; the underground structure with underground heat exchange tube formed based on this underground buried pipe is called energy underground structure, and the typical representative of energy pile technology energy underground structure is the excellent use of shallow geothermal energy in recent years. One of the technical solutions; combined with the specific form of the 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

-und Metallwerke Aktiengesellschaft and Armin Ing.Amann apply for and authorize the European and German invention patent "Energy pile (EP1486741 B1, DE50305842D1)".

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 exchange 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 exchange 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 the literatures 11 to 13, a construction method for tying a spiral type underground heat exchange tube or a heat exchange tube embedded in a steel pipe in a steel cage in a cast-in-place pile is disclosed. 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 exchange 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 exchange 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, no matter which form of energy pile technology is used, the shallow geothermal energy is based on the direct heat transfer principle. Direct use, no conversion in the form of energy.

Geothermal energy can not only directly utilize its thermal energy through heat pump technology, but also can be used for power generation. The traditional geothermal power generation principle is similar to that of thermal power generation. The medium-high temperature (>80°C) layer of underground hot water and steam is used as the power source. First, the underground thermal energy is converted into mechanical energy, and then the mechanical energy is converted into electrical energy. In documents 17 to 18, a facility and method for generating deep geothermal energy based on hot water wells is disclosed; in documents 19-22, a deep borehole, underground mine, and oil production layer are disclosed, respectively. Casing or underground rock tunnel structure, a method of converting deep geothermal energy into electric energy; this power generation method has the following disadvantages: (1) The heat source temperature is generally required to be greater than >80 ° C. In other words, these technical methods are for shallow geothermal energy. (Generally <25°C) is not applicable; (2) The number of energy morphological conversions is relatively high, resulting in a decrease in energy utilization rate; (3) The development of underground deep heat source is relatively difficult, the development cost is high, and the development cost is almost non-progressive with the mining depth. Linear growth.

Document 17: US invention patents filed and authorized by Schnatzmeyer, Mark A. and Clark E. Robison "Method and apparatus for generating electric power downhole." U.S. Patent No. 6, 150, 602.11 Nov. 2000.

Document 18: Jeffryes, Benjamin Peter, US Patent Application "Method and apparatus for downhole thermoelectric power generation." U.S. Patent No. 7, 770, 645.10 Aug. 2010.

Document 19: US Patent Application "Method for recovering thermal energy contained in subterranean hot rock." U.S. Patent No. 5,515,679.14 May 1996, filed and issued by Shulman, Gary.

Document 20: U.S. Patent No. 7,984,613.26 Jul. 2011, filed and authorized by DuBois, John R, entitled "Geothermal power generation system and method for adapting to mine shafts."

Document 21: Chinese invention patents applied and authorized by Gong Zhiyong “Methods and devices for transferring underground thermal energy using oil casings (Patent No.: CN201010101312.3)”.

In 1999, DiSalvo pointed out that based on semiconductor low-temperature thermoelectric power generation technology, it is possible to realize thermoelectric conversion between subtle temperature differences (Ref. 22). Using semiconductor thermoelectric power generation technology, in Document 23, an ultra-deep high temperature (1200-1800 ° C) is disclosed. A technical method for generating electricity from a temperature difference between a deep intermediate temperature (250 to 600 ° C); a method for converting deep geothermal energy into electric energy based on an underground rock tunnel structure is disclosed in the literature 24; A technical method based on ground-source heat pump technology to transmit deep geothermal energy to the surface, and to make the heat exchange tube and the temperature difference in the air (that is, deep geothermal energy provides heat source and natural air provides cold source) to generate electricity.

Document 22: Academic paper published by DiSalvo, F J. "Thermoelectric cooling and power generation." Science, 285.5428 (1999): 703-706.

Document 23: Levoy, Larry, U.S. Patent Application Serial No. 4,047, 093.6 Sep. 1977, filed and assigned.

Document 24: Chen Guoqing, Yang Yang, Zhao Cong and Li Tianbin applied for the Chinese invention patent “a high temperature tunnel cooling and heat transfer and thermal energy conversion device (patent application number: CN201510663196.7)”.

Document 25: Liu, Liping published an academic paper "Feasibility of large-scale power plants based on thermoelectric effects." New Journal of Physics 16.12 (2014): 123019.

Semiconductor temperature difference power generation can be used not only in the case of large relative temperature difference, but also in the case of relatively small temperature difference. The semiconductor temperature difference power generation chip technology effectively breaks the limitation of relative temperature difference on power generation, and greatly expands the conversion of thermal energy into The types and channels of electrical energy also make it possible to convert shallow geothermal energy directly into electrical energy. In the literatures 26 to 27, a technical method for providing a heat source by using solar energy and providing a cold source for providing differential temperature power generation by using shallow geothermal energy is disclosed; these technical methods play a good demonstration role for utilizing shallow geothermal energy for temperature difference power generation. ; however, The use of shallow geothermal energy in documents 26 to 27 is to first transfer the shallow geothermal energy to the liquid in the heat exchange tube through the heat exchange tube, and bring the heat energy to the surface through the flow of the liquid in the heat exchange tube, and then use the exchange The temperature difference between the temperature of the liquid in the heat pipe and the surface medium (solar or air) is used for power generation; this method has the following disadvantages: (1) It is necessary to drill holes in the formation in advance, embed the heat exchange tubes, and occupy the 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 exchange tube, and then the liquid in the heat exchange tube and other objects at different temperatures on the surface are used for temperature difference power generation, and the number of energy transmission increases. It also leads to a decrease in energy efficiency; (3) shallow geothermal energy does not directly convert energy through the soil.

Document 26: 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 27: The US invention patent "System for collecting and delivering solar and geothermal heat energy with thermoelectric generator." U.S. Patent No. 8,286,441.16 Oct. 2012, filed and assigned by Simka, P.

Therefore, in view of the shortcomings and defects existing in the current use of shallow geothermal energy for temperature difference power generation technology, combined with the underground heat transfer tube form (such as underground continuous wall, pile foundation, underground anchor), the technical advantage of cost can be saved. Development of a cold-heated cogeneration underground structure that can simultaneously use the temperature difference between the shallow geothermal energy and the heat exchange tube to generate electricity, the heat energy transmitted through the heat exchange tube to supply the upper air-conditioning heating or the cold energy supply to the upper air-conditioning refrigeration The program is particularly important.

Summary of the invention

OBJECT OF THE INVENTION In order to overcome the above-mentioned deficiencies and shortcomings, it is solved that (1) conventional energy piles and energy underground continuous wall technologies can only achieve thermal energy transfer, and the total heat exchange is limited by factors such as unit space and geothermal capacity in space, (2) Conventional deep geothermal temperature difference power generation has high requirements on the absolute value of heat source temperature (general requirements >80 °C), relatively difficult development and high development cost, and (3) cost of borehole pipe construction in conventional shallow geothermal temperature difference power generation scheme The problem is that the high-occupied land area or the underground space is large, and the temperature difference between the soil itself and the medium is not used for direct power generation, and a cold-cold-electric cogeneration underground wall device and a construction method thereof are proposed. The heat exchange tube in the underground continuous wall is connected with the water pump, the valve and the heat exchange equipment on the surface to form a shallow geothermal energy air conditioning system; the semiconductor thermoelectric power generation device outside the heat exchange tube I, and the semiconductor thermoelectric power generation device between the adjacent heat exchange tubes II, connected with DC/DC converter, battery, wire and electrical equipment to form a shallow geothermal energy temperature difference power generation system; finally constitute a cold and cogeneration underground continuous wall device.

Technical Solution: In order to achieve the above object, the present invention provides a cold and cogeneration joint continuous wall device, The device comprises: an underground continuous wall, a heat exchange tube disposed inside the underground continuous wall, an air conditioning system and a thermoelectric power generation system; wherein:

The air conditioning system includes a heat exchange device, the heat exchange device is disposed above the heat exchange tube, and the liquid flow rate in the heat exchange tube is controlled by a water pump and a valve, and the heat exchange tube first exchanges heat with the soil, and then passes through the upper heat exchange. The device exchanges heat with indoor air to adjust the room temperature;

The thermoelectric power generation system includes a semiconductor thermoelectric power generation device 1 and a semiconductor thermoelectric power generation device II, wherein the semiconductor thermoelectric power generation device 1 is disposed outside the heat exchange tube, and the semiconductor thermoelectric power generation device II is disposed in an adjacent heat exchange tube. The semiconductor thermoelectric power generation device I realizes thermoelectric conversion and heat exchange by using a temperature difference between the heat exchange tube and the soil on the pile side, and supplies the obtained electric power to the upper electric equipment; the semiconductor thermoelectric power generation device I passes The temperature difference between adjacent heat exchange tubes enables thermoelectric conversion and heat exchange, and the obtained electric power is supplied to the upper electric equipment.

Specifically, the semiconductor thermoelectric power generation device 1 includes a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel, and a thermal conductive protection layer. The semiconductor thermoelectric power generation sheet is pasted on the outer side of the heat exchange tube by using a thermal conductive silica gel, and the thermal conduction protection is disposed outside the semiconductor thermoelectric power generation sheet. In the layer, the power obtained by the semiconductor thermoelectric power generation is sequentially connected to the DC/DC converter and the battery by using a wire to supply power to the upper electric device.

The semiconductor thermoelectric power generation device II comprises a micro heat exchange tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a thermal conductive protection layer, wherein the micro heat exchange tubes are evenly spaced on the bottom plate, and the micro heat exchange tubes are alternately adjacent to each other. Two heat exchange tubes are connected, and a semiconductor temperature difference power generation piece is arranged between adjacent micro heat exchange tubes; a heat conduction protection layer is arranged outside the semiconductor temperature difference power generation piece, and a wire connecting the semiconductor temperature difference power generation piece is buried in the thermal conductive silica gel along the sidewall of the steel cage The heat exchange tube is led out of the ground, and the power obtained by the semiconductor thermoelectric power generation is connected to the DC/DC converter and the battery in turn to supply power to the upper electric equipment.

The above semiconductor thermoelectric power generation chips are all semiconductor temperature difference power generation chips commonly used in the prior art, and include a hot end, a cold end, a P-type semiconductor, an N-type semiconductor, a metal piece, and a heat conducting plate.

Preferably, the length, width, depth, concrete number of the underground continuous wall and the size of the steel cage are designed according to the upper load requirements. In one embodiment, the underground continuous wall has a length of 200 to 300 m, a width of 0.8 to 1.2 m, and a depth of 20 to 40 m.

The heat exchange tube is a polyethylene tube (also referred to as a PE tube), and the outer diameter, wall thickness and length thereof are determined according to the length and depth of the underground continuous wall and the arrangement of the heat exchanger tube. When the size of the local continuous wall is large The heat exchange tube also takes a large value; preferably, the outer diameter is 25 to 50 mm, the wall thickness is 5 to 8 mm, and the length is 1000 to 1500 m; The reinforcing cage side wall; the heat exchange tube buried tube is in the form of a series U-shaped, parallel U-shaped, W-shaped or spider-like form or a combination thereof.

Preferably, the water pump 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 a fan coil in the air conditioning device.

The micro heat exchange tube has an outer diameter of 5 to 10 mm, a wall thickness of 1 to 3 mm, and a length of 30 to 150 cm.

The thermal conductive silica gel has a thermal conductivity of 0.6-1.5 W/(m·K), has high bonding performance and superior thermal conductivity, and is non-curing and non-conductive; the thermal conductive protective layer is stainless steel iron or silica gel. The base composite material prevents the semiconductor thermoelectric power generation chip from being damaged during the concrete pouring and vibrating process; the DC/DC converter is located at the surface of the surface, and is a step-up DC/DC converter; the storage battery is located at the surface and is a lead storage battery or lithium An ion storage battery or a lithium ion polymer battery or a nickel cadmium battery; the wire is embedded in a thermally conductive silicone.

The invention further provides a construction method for a cogeneration underground wall device, comprising the following steps:

(1) Semiconductor temperature difference power generation device I: According to the design requirements, the heat exchange tube is selected, and the semiconductor thermoelectric power generation piece is pasted on the outer side of the heat exchange tube at the design position by using the thermal conductive silica gel, and the wire connecting the semiconductor thermoelectric power generation piece is embedded in the thermal conductive silica gel, and is taken out. The ground is connected to the DC/DC converter, the battery and the electric equipment in sequence; the heat exchange tube containing the semiconductor thermoelectric power generation piece is bundled on the side wall of the steel cage;

(2) Semiconductor temperature difference power generation device II: According to the design requirements, the bottom plate is selected, and evenly spaced micro heat exchange tubes are arranged on the bottom plate, and the micro heat exchange tubes are alternately connected with the adjacent two heat exchange tubes, and adjacent micro heat exchange tubes A semiconductor thermoelectric power generation chip is arranged between the semiconductor thermoelectric power generation sheets; a heat conduction protection layer is disposed outside the semiconductor thermoelectric power generation sheet, and a wire connecting the semiconductor thermoelectric power generation chips is embedded in the thermal conductive silica gel, and the heat exchange tube along the sidewall of the steel cage is taken out from the ground, and sequentially is connected to the DC at the surface. /DC converter, battery and electrical equipment connection;

(3) Underground continuous wall construction: According to the upper load, design and determine the length, width, depth and size and shape of the underground continuous wall; comprehensively consider the length, depth, shallow geothermal energy reserves, upper air conditioning system and electricity consumption Equipment energy demand, design heat exchanger tube buried pipe form; make steel cage with heat exchange tube, semiconductor thermoelectric power generation device I and semiconductor thermoelectric power generation device II; set guide wall, mud retaining wall trenching construction to design depth, lowering steel cage , pouring concrete to complete the construction of the underground continuous wall structure;

(4) Connection of refrigeration, heating and power supply system: connecting the heat exchange tube with the water pump and heat exchange equipment to form a shallow geothermal energy air conditioning system to provide cooling or heating for the upper building, and to connect the wire to the DC/DC converter, battery and The electrical equipment connection constitutes a shallow geothermal energy temperature difference power generation system to provide electricity for the upper building (such as lighting LED lights); according to the total amount of shallow geothermal energy reserves and the demand for power, cooling or heating of the upper building, you can choose Air conditioning only The system (refrigeration or heating), only the thermoelectric system (power supply), or the air conditioning system and the thermoelectric system are used simultaneously; finally, the construction and application of the underground continuous wall device for cogeneration of cogeneration.

Preferably, the semiconductor thermoelectric power generation chip is mainly buried outside the heat exchange tube of 10-15 m or less, and the buried tube form of the heat exchange tube may be any of a series U shape, a parallel U shape, a W shape or a spider shape. One or a combination of several.

The beneficial effects: compared with the existing underground underground structure technology in the form of underground continuous wall buried pipe, the cold continuous heat and power cogeneration underground continuous wall of the invention has the following technical advantages:

(1) In addition to providing the function of supporting the load of the upper load, using the shallow geothermal energy to cool or heat the upper building (providing a cold source in summer and providing a heat source in winter), it is also possible to use liquid and soil in the heat exchange tube. The temperature difference between the two, the temperature difference between the adjacent heat exchange tubes to generate electricity, to supply electricity to the upper building;

(2) Shallow geothermal energy can be selected according to the needs of the upper building environment, only air conditioning system (refrigeration or heating), thermoelectric power generation system only (power supply), or partial supply of air conditioning system partially supply thermoelectric power generation system to achieve on-demand and wrong time of energy Effective use to improve energy efficiency.

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 cold continuous heat and power cogeneration underground wall device according to the present invention;

2 is a schematic view showing a form of embedding a heat exchange tube in a cold-cold-cogeneration underground continuous wall device according to the present invention, wherein (a) is a U-shaped series, (b) is a parallel U-shape, and (c) is a W-shaped, (d) ) is spider-like;

Figure 3 is a cross-sectional view of the AA of the heat exchange tube embedded in the steel cage of the present invention, wherein (a) is a U-shape in series, (b) is a parallel U-shape, (c) is a W-shape, and (d) is a spider. shape;

Figure 4 is a cross-sectional view showing the arrangement of the semiconductor thermoelectric power generation apparatus 1 of the present invention;

Figure 5 is a cross-sectional view taken along the line B-B of the semiconductor thermoelectric power generation device I of the present invention;

Figure 6 is a cross-sectional view showing the arrangement of the semiconductor thermoelectric power generation device II of the present invention;

Figure 7 is a perspective view of a semiconductor thermoelectric power generation chip of the present invention;

Figure 8 is a cross-sectional view of a semiconductor thermoelectric power generation chip of the present invention;

In the figure: 1 is the underground continuous wall, 2 is the heat exchange tube, 3 is the semiconductor thermoelectric power generation device I, 4 is the semiconductor thermoelectric power generation device II, 5 is the valve, 6 is the water pump, 7 is the heat exchange equipment, 8 is the wire, 9 For the DC/DC converter, 10 is the battery, 11 is the electric equipment, 12 is the steel cage, 13 is the main rib, 14 is the stirrup, 15 is the semiconductor thermoelectric power generation chip, 16 is the P-type semiconductor, 17 is the N-type semiconductor, 18 is a metal sheet, 19 is a heat conducting plate, 20 is a hot end, 21 For the cold end, 22 is a thermal protective layer, 23 is a micro heat exchange tube, and 24 is a thermal silica gel.

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 cold and heat electricity cogeneration underground wall device, the device comprises: an underground continuous wall, a heat exchange tube disposed inside the underground continuous wall, an air conditioning system and a thermoelectric power generation system; wherein: the air conditioning system comprises a heat exchange The equipment and the heat exchange device are arranged above the heat exchange tube, and the liquid flow rate in the heat exchange tube is controlled by the water pump and the valve, and the heat exchange tube is first exchanged with the soil body, and then exchanged with the indoor air through the upper heat exchange device to adjust the room temperature. .

The thermoelectric power generation system includes a semiconductor thermoelectric power generation device I and a semiconductor thermoelectric power generation device II, wherein the semiconductor thermoelectric power generation device 1 includes a semiconductor thermoelectric power generation chip, a thermal conductive silica gel, and a thermal conductive protective layer, and the semiconductor thermoelectric power generation sheet is bonded to the heat exchange tube by using a thermal conductive silicone. On the outer side, the heat conduction protection layer is disposed outside the semiconductor thermoelectric power generation chip, and the semiconductor thermoelectric power generation device I realizes thermoelectric conversion and heat exchange by using a temperature difference between the heat exchange tube and the pile side soil body, and the obtained electric power is sequentially connected to the DC/DC by using a wire. The converter and battery provide power for the upper electrical equipment. The semiconductor thermoelectric power generation device II comprises a micro heat exchange tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a thermal conductive protective layer. The micro heat exchange tubes are evenly spaced on the bottom plate, and the micro heat exchange tubes are alternately connected with the adjacent two heat exchange tubes. A semiconductor thermoelectric power generation chip is arranged between the adjacent micro heat exchange tubes; a heat conduction protection layer is disposed outside the semiconductor temperature difference power generation piece, and a wire connecting the semiconductor temperature difference power generation piece is embedded in the thermal conductive silica gel, and the heat exchange tube along the sidewall of the steel cage is taken out from the ground. The semiconductor thermoelectric power generation device I realizes thermoelectric conversion and heat exchange by temperature difference between adjacent heat exchange tubes, and sequentially connects the obtained power to the DC/DC converter and the battery to supply power to the upper electric equipment.

The construction method of the cogeneration underground wall device is described in detail below.

First, as shown in Figure 1, according to the upper load, the length, width, depth of the underground continuous wall 1 and the size and form of the steel cage 12 are designed and determined; considering the length, depth, shallow geothermal energy reserves, the upper air conditioning system and The energy demand of the electric equipment 11 is used to design the heat pipe 2 to be buried. Preferably, the underground continuous wall 1 has a length of 200 to 300 m, a width of 0.8 to 1.2 m, and a depth of 20 to 40 m (in this embodiment, the length is 200 m, the width is 0.8 m, and the depth is 30 m). Preferably, the heat exchange tube 2 is a polyethylene tube (also referred to as a PE tube) having an outer diameter of 25 to 50 mm, a wall thickness of 5 to 8 mm, and a length of 1000 to 1500 m (the outer diameter of the embodiment is 25 mm, and the wall thickness is It is 5mm and the length is 1500m); the heat exchange tube 2 is tied and embedded in the side wall of the steel cage 12; the heat exchange tube 2 can be in the form of a series U or a parallel U-shaped, W-shaped or spider-shaped one or several The combination is shown in Figures 2 and 3 (this embodiment is W-shaped).

Next, a semiconductor thermoelectric power generation device I 3 is produced: as shown in FIGS. 4 to 5, according to the arrangement of the heat exchange tubes 2, The semiconductor thermoelectric power generation chip 15 is bonded to the outer side of the heat exchange tube 2 at the corresponding design position, and the heat exchange tube 2 is bundled on the side wall of the steel cage 12, and the wire 8 connected to the semiconductor thermoelectric power generation chip 15 is embedded in the thermal conductive silica gel 24, And the ground is taken out, and connected to the DC/DC converter 9, the battery 10 and the electric equipment 11; preferably, the semiconductor thermoelectric power generation device I 3 is mainly buried outside the heat exchange tube 2 of 10 to 15 m; preferably, the semiconductor thermoelectric power generation device I 3 The thermal conductivity of the thermal conductive silica gel 24 is 0.6 to 1.5 W/(m·K) (1.0 W/(m·K) in this embodiment), and has high bonding performance and superior thermal conductivity, and does not solidify. The non-conductive property; the thermal protective layer 22 is a stainless steel iron or silica-based composite material (this embodiment is a silica-based composite material) to prevent the semiconductor thermoelectric power generation sheet 15 from being damaged during concrete pouring and vibrating; DC/DC The converter 9, located at the surface, is a step-up DC/DC converter 9; the battery 10 is located at the surface, and is a lead storage battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery (in this embodiment, a lead storage battery); Wire 8, buried in the guide 24 within the silicone.

Production of semiconductor thermoelectric power generation device II 4: As shown in FIG. 6, the bottom plate is selected according to design requirements, and evenly spaced micro heat exchange tubes 23 are arranged on the bottom plate, and the micro heat exchange tubes 23 are alternately connected with the adjacent two heat exchange tubes 2 A semiconductor thermoelectric power generation chip 15 is disposed between the adjacent micro heat exchange tubes 23; a heat conduction protection layer 22 is disposed outside the semiconductor thermoelectric power generation sheet 15, and the wires 8 connected to the semiconductor thermoelectric power generation sheet 15 are buried in the thermal conductive silica gel 24 along the steel cage 12 The heat exchange tube 2 of the side wall is led out of the ground, and is connected to the DC/DC converter 9, the battery 10 and the electric device 11 at the surface; preferably, the semiconductor thermoelectric power generator II 4, the micro heat exchange tube 23 has an outer diameter of 5~10mm, wall thickness is 2~3mm, length is 5~15m (outer diameter is 6mm, wall thickness is 2mm, length is 10m); thermal conductivity of thermal silica gel 24 is 0.6~1.5W/(m · K) (0.8W / (m · K) in this embodiment), has high bonding properties and superior thermal conductivity, does not solidify, does not conduct electricity; thermal protective layer 22, stainless steel iron or Silica gel-based composite material (this embodiment is a silica-based composite material) to prevent semiconductor temperature The power generation sheet 15 is damaged during concrete pouring and vibrating; the DC/DC converter 9 is located at the surface and is a step-up DC/DC converter 9; the battery 10 is located at the surface and is a lead storage battery or a lithium ion battery or lithium ion. The polymer battery or the nickel cadmium battery (this embodiment is a lead storage battery); the wire 8 is embedded in the thermal conductive silica gel 24. The semiconductor thermoelectric power generation chip 15 used in the present invention is common in the prior art, and includes a hot end 20, a cold end 21, a P-type semiconductor 16, an N-type semiconductor 17, a metal piece 18, and a heat conducting plate 19, and its structure is as shown in FIG. ~8 is shown.

Then, the guide wall is set on the surface, the mud retaining wall is trenched to the design depth, the heat transfer tube 2 is lowered, the semiconductor thermoelectric power generation device I 3 and the semi-concrete cage 12 of the semiconductor thermoelectric power generation device II 4 are poured, concrete is poured, and the underground continuous wall is completed. Construction of the structure;

Finally, the air conditioning system is connected: the heat exchange tube 2 is connected with the water pump 6 and the heat exchange device 7 to form a shallow geothermal air conditioner. The system provides cooling or heating for the upper building; preferably, in the air conditioning system, the water pump 6, located at the surface, has a power of 0.55 to 1.2 kW; the valve 5 is an electric two-way valve; and the heat exchange device 7 is in the air conditioning device. Fan coil. Connecting the power generation system: connecting the heat exchange tube 2, the semiconductor thermoelectric power generation device I 3, the semiconductor thermoelectric power generation device II 4, the DC/DC converter 9, the battery 10, and the electric equipment 11 through a wire to form a shallow geothermal energy temperature difference power generation system, Provide electricity to the upper building (such as lighting LED lights). According to the total reserve of shallow geothermal energy and the demand for power supply, cooling or heating of the upper building, it is possible to select only the air conditioning system (cooling or heating), the thermoelectric system only (power supply), or the air conditioning system and the thermoelectric system simultaneously. Finally, the construction and application of the underground continuous wall 1 device for cogeneration of cogeneration.

The cogeneration underground wall of the invention is a new type of multifunctional composite energy application system, in addition to providing the function of supporting the load of the upper building, and utilizing the shallow geothermal energy to cool or heat the upper building. In addition, the temperature difference between the liquid and the soil in the heat exchange tube can be used to generate electric energy to supply electricity to the upper building, and the heat exchange efficiency between the heat exchange tube and the soil can be improved; the system not only effectively realizes the dynamics of the underground continuous wall, The combined use of heat and electricity, and the realization of shallow geothermal energy on-demand, wrong multi-purpose effective use, improve energy efficiency.

Claims

A cogeneration underground wall device for cold, heat and power, characterized in that the device comprises: an underground continuous wall, a heat exchange tube disposed inside the underground continuous wall, an air conditioning system and a thermoelectric power generation system; wherein:

The air conditioning system includes a heat exchange device, the heat exchange device is disposed above the heat exchange tube, and the liquid flow rate in the heat exchange tube is controlled by a water pump and a valve, and the heat exchange tube first exchanges heat with the soil, and then passes through the upper heat exchange. The device exchanges heat with indoor air to adjust the room temperature;

The thermoelectric power generation system includes a semiconductor thermoelectric power generation device 1 and a semiconductor thermoelectric power generation device II, wherein the semiconductor thermoelectric power generation device 1 is disposed outside the heat exchange tube, and the semiconductor thermoelectric power generation device II is disposed in an adjacent heat exchange tube. The semiconductor thermoelectric power generation device I realizes thermoelectric conversion and heat exchange by using a temperature difference between the heat exchange tube and the soil on the pile side, and supplies the obtained electric power to the upper electric equipment; the semiconductor thermoelectric power generation device I passes The temperature difference between adjacent heat exchange tubes enables thermoelectric conversion and heat exchange, and the obtained electric power is supplied to the upper electric equipment.
The combined heat and power generation underground continuous wall device according to claim 1, wherein the semiconductor thermoelectric power generation device 1 comprises a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a thermal conductive protective layer, and the semiconductor thermoelectric power generation sheet utilizes heat conduction. The silica gel is adhered to the outside of the heat exchange tube, and the heat conduction protection layer is disposed outside the semiconductor temperature difference power generation sheet. The power obtained by the semiconductor temperature difference power generation is connected to the DC/DC converter and the battery in turn to provide power supply for the upper power equipment.
The combined heat and power generation underground continuous wall device according to claim 1, wherein the semiconductor thermoelectric power generation device II comprises a micro heat exchange tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a thermal conductive protective layer, The micro heat exchange tubes are evenly spaced on the bottom plate, the micro heat exchange tubes are alternately connected with the adjacent two heat exchange tubes, and the semiconductor thermoelectric power generation sheets are arranged between the adjacent micro heat exchange tubes; the heat conduction protection is arranged outside the semiconductor thermoelectric power generation sheets Layer, the wire connecting the semiconductor thermoelectric power generation chip is buried in the thermal silica gel, and the heat exchange tube along the side wall of the steel cage is taken out of the ground, and the power obtained by the semiconductor thermoelectric power generation is connected to the DC/DC converter and the battery in turn for the upper electricity. The equipment provides electricity.
The cogeneration underground wall apparatus according to claim 1, wherein the length, the width, the depth, the concrete number of the underground continuous wall, and the size of the steel cage are designed according to the upper load requirement.
The combined heat and power generation underground continuous wall device according to claim 1, wherein the heat exchange tube is a polyethylene tube, and the outer diameter, the wall thickness and the length thereof are according to the length, depth and heat exchange of the underground continuous wall. The arrangement of the tube-buried tube needs to be determined; the heat-exchange tube is bundled and embedded in the side wall of the steel cage; the heat-exchange tube is in the form of a U-shaped, parallel U-shaped, W-shaped or spider-like form in series or several combinations.
The combined heat and power cogeneration underground wall device according to claim 1, wherein the water pump is located at a 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 It is a fan coil in air conditioning equipment.
The cogeneration underground wall device according to claim 3, wherein the micro heat exchange tube has an outer diameter of 5 to 10 mm, a wall thickness of 1 to 3 mm, and a length of 30 to 150 cm.
The cold-cold-electric cogeneration underground wall device according to claim 2 or 3, wherein the thermal conductive silica gel has a thermal conductivity of 0.6 to 1.5 W/(m·K), and has high bonding performance and super strength. The thermal conductive effect, and the characteristics of non-curing and non-conducting; the thermal conductive protective layer is a stainless steel iron or silica-based composite material, preventing the semiconductor thermoelectric power generation chip from being damaged during concrete pouring and vibrating; the DC/DC converter is located The surface is a step-up DC/DC converter; the battery is located on the surface and is a lead storage battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery; the wire is embedded in the thermal silica gel.
A method for constructing a cogeneration underground wall device for cold, heat and power, characterized in that the method comprises the following steps:

(1) Semiconductor temperature difference power generation device I: According to the design requirements, the heat exchange tube is selected, and the semiconductor thermoelectric power generation piece is pasted on the outer side of the heat exchange tube at the design position by using the thermal conductive silica gel, and the wire connecting the semiconductor thermoelectric power generation piece is embedded in the thermal conductive silica gel, and is taken out. The ground is connected to the DC/DC converter, the battery and the electric equipment in sequence; the heat exchange tube containing the semiconductor thermoelectric power generation piece is bundled on the side wall of the steel cage;

(2) Semiconductor temperature difference power generation device II: According to the design requirements, the bottom plate is selected, and evenly spaced micro heat exchange tubes are arranged on the bottom plate, and the micro heat exchange tubes are alternately connected with the adjacent two heat exchange tubes, and adjacent micro heat exchange tubes A semiconductor thermoelectric power generation chip is arranged between the semiconductor thermoelectric power generation sheets; a heat conduction protection layer is disposed outside the semiconductor thermoelectric power generation sheet, and a wire connecting the semiconductor thermoelectric power generation chips is embedded in the thermal conductive silica gel, and the heat exchange tube along the sidewall of the steel cage is taken out from the ground, and sequentially is connected to the DC at the surface. /DC converter, battery and electrical equipment connection;

(3) Underground continuous wall construction: According to the upper load, design and determine the length, width, depth and size and shape of the underground continuous wall; comprehensively consider the length, depth, shallow geothermal energy reserves, upper air conditioning system and electricity consumption Equipment energy demand, design heat exchanger tube buried pipe form; make steel cage with heat exchange tube, semiconductor thermoelectric power generation device I and semiconductor thermoelectric power generation device II; set guide wall, mud retaining wall trenching construction to design depth, lowering steel cage , pouring concrete to complete the construction of the underground continuous wall structure;

(4) Connection of refrigeration, heating and power supply system: connecting the heat exchange tube with the water pump and heat exchange equipment to form a shallow geothermal energy air conditioning system to provide cooling or heating for the upper building, and to connect the wire to the DC/DC converter, battery and The electrical equipment connection constitutes a shallow geothermal energy temperature difference power generation system to provide electricity to the upper building; according to the total amount of shallow geothermal energy storage For the supply and cooling or heating requirements of the upper building, you can choose only the air conditioning system, the temperature difference power generation system, or the air conditioning system and the thermoelectric power generation system at the same time; finally realize the construction and application of the underground continuous wall device for cogeneration of cogeneration .
The construction method according to claim 9, wherein in the step (1), the semiconductor thermoelectric power generation chip is mainly buried outside the heat exchange tube of 10 to 15 m or less, and the buried tube form of the heat exchange tube may be Any one or combination of U-shaped, parallel U-shaped, W-shaped or spider-like forms in series.