WO2018014609A1 - Jet grouting soil-cement-pile strengthened pile system for combined cooling, heat and power generation and construction method therefor - Google Patents

Abstract

Disclosed is a jet grouting soil-cement-pile strengthened pile system for combined cooling, heat and power generation, comprising jet grouting soil-cement-pile strengthened piles, heat transfer pipes (2), an air-conditioning system and a temperature-difference power generation system. The air-conditioning system comprises a heat exchange device (10), wherein the heat transfer pipes (2) firstly exchange heat with soil mass, and are then connected to the heat exchange device (10) above so as to adjust the indoor temperature of a building. The temperature-difference power generation system comprises a semiconductor temperature-difference power generation system I (15) and a semiconductor temperature-difference power generation system II (25), obtained electric power being used for electric power supply for electric equipment (14) above. The system supplies electric energy to a building above by using a temperature difference between liquid in the heat exchange pipes (2) and soil, as well as provides a bearing function of supporting loads of the building above and the function of cooling or heating the building above by means of shallow geothermal energy, and improves heat exchange efficiency between the heat exchange pipes (2) and soil mass. The system effectively realizes the combined utilization of the jet grouting soil-cement-pile strengthened piles in terms of mechanics, thermotics and electricity, and also realizes the on-demand and time-interleaved multi-purpose utilization of shallow geothermal energy in an effective manner.

Description

Combined high-pressure rotary jet ferrule composite pile system for cold, heat and power generation and construction method thereof Technical field

The invention relates to a shallow geothermal energy utilization technology, and is mainly applicable to the technical field of building pile foundation, etc., in particular to a cold and hot cogeneration high pressure rotary jet ferrule composite pile system 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 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)".

Metallwerke Aktiengesellschaft和Armin Ing.Amann申请并授权的欧洲和德国发明专利“Energy pile(EP1486741 B1,DE50305842D1)”。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: Ing. Armin Amann applied for and authorized the German invention patent "Concrete pile foundation for absorbing geothermal energy, contains corrugated sleeve pipe (DE202004014113 U1)", corresponding other national patent authorization number: AT7887 U1.

Document 4: The PCT patent "Pile with integral geothermal conduit loop retaining means (PCT/CA2010/001500)" filed and authorized by Alain Desmeules, the 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: EP1243875B1, NL1017655C2, DE60200183T2.

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, Chinese invention patents applied for and authorized “A construction method for buried pipes in geothermal heat pumping piles in steel cages (Patent No.: CN201310302155.6), Authorized Announcement Date March 2015 11th."

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 the literatures 14 to 15, it is disclosed that the bottom of the cast-in-place cast-in-place pile is filled and the heat transfer liquid is filled in the cavity of the pile body. And the construction method of the open or underground heat transfer tube is arranged.

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, 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: Schnatzmeyer, Mark A. and Clark E. Robison, US Patent Application "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, Shullman, Gary.

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

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 thermoelectric conversion between subtle temperature differences can be achieved based on semiconductor low temperature thermoelectric power generation technology (Documentation) 22) Using the semiconductor thermoelectric power generation technology, a technical method for generating electricity by using a temperature difference between an ultra-deep high temperature (1200 to 1800 o C) and a deep intermediate temperature (250 to 600 o C) is disclosed in the literature 23; A method for converting deep geothermal energy into electric energy based on an underground rock tunnel structure; in Document 25, a geothermal heat pump technology is disclosed to transfer deep geothermal energy to the surface, and the temperature difference between the heat transfer tube and the air (ie, Deep geothermal energy provides a heat source, natural air provides a 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 No. 4,047, 093.6 Sep. 1977, filed and granted.

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 shallow geothermal energy in the literature 26-27 is obtained by transferring the shallow geothermal energy through the heat transfer tube to the liquid in the heat transfer tube, and bringing the heat energy to the surface through the flow of the liquid in the heat transfer tube. Then use the temperature difference between the liquid in the heat transfer tube and the surface medium (solar or air) temperature to generate electricity; this method has the following shortcomings: (1) need to pre-drill in the formation, embed the heat transfer tube, there is occupation The land area and underground space are large, and the cost of initial buried facilities is high. (2) The 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. Increased number of passes will also result in reduced energy utilization; (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 issued by Mount, Robert.

Document 27: "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 granted by Simka, P.

Therefore, in view of the shortcomings and shortcomings in the current use of shallow geothermal energy for temperature difference power generation technology, combined with the technical advantages of cost-effective pile pile tube in the energy pile technology, a shallow geothermal energy and heat transfer tube can be developed simultaneously. The technical solution between the temperature difference between the power generation, the heat energy transmitted through the heat transfer tube to supply the upper air-conditioning heating or the cold energy supply to the upper air-conditioning refrigeration cogeneration pile is particularly It is 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; Cogeneration high-pressure rotary jet ferrule composite pile system and construction method thereof, when the building is constructed, the thermoelectric power generation device and the ground source heat pump device are directly buried in the pile foundation of the building to make it and the building structure Combine. The heat transfer tube on the side wall of the core pile is connected with the water pump I and the heat exchange equipment to form a shallow geothermal energy air conditioning system; the heat transfer tube of the side wall of the core pile, the semiconductor thermoelectric power generation device I, the semiconductor thermoelectric power generation device II, and the wire, DC The /DC converter, battery and water pump II are connected to form a shallow geothermal energy temperature difference power generation system; finally, the application of the combined heat and power cogeneration high pressure rotary jet ferrule composite pile system is realized.

Technical Solution: In order to achieve the above object, the present invention provides a combined heat and power generation high-pressure rotary jet ferrule composite pile system, which comprises: a high-pressure rotary jet ferrule composite pile, a heat transfer tube, an air conditioning system, and a thermoelectric power generation system; among them,

The air conditioning system comprises a heat exchange device, the heat exchange device is arranged above the heat transfer tube, and 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 first exchanged with the soil body, and then the upper heat exchange is connected. Equipment to regulate the indoor temperature in the building;

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 I realizes thermoelectric conversion using a temperature difference between a heat transfer tube and a pile-side soil body, and obtains the obtained The electric power is supplied to the electric power of the upper electric equipment; the semiconductor thermoelectric power generation device II realizes energy conversion by using the temperature difference between the heat transfer tube and the heat dissipating tube, and supplies the obtained electric power to the electric power of the upper electric equipment.

The semiconductor thermoelectric power generation device 1 includes a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel, and a thermal conductive protective layer. The semiconductor thermoelectric power generation sheet is bonded to the outside of the heat transfer tube by using a thermal conductive silica gel, and a thermal conductive protective layer is disposed outside the semiconductor thermoelectric power generation sheet, and the semiconductor temperature difference power generation is performed. The sheet uses the temperature difference between the heat transfer tube and the soil on the pile side to realize thermoelectric conversion, and uses the wire to sequentially connect the power obtained by the semiconductor temperature difference power generation to the power supply of the DC/DC converter and the battery for the upper electric equipment.

The semiconductor thermoelectric power generation device II includes a heat dissipation tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silicone, and a heat conductive bottom plate. The heat dissipation tube is evenly arranged on the heat conduction substrate, and the heat dissipation tube is wound around the heat transfer tube to which the semiconductor temperature difference power generation sheet is attached. On the outside, the wires connecting the semiconductor thermoelectric power generation chips are buried in the thermal conductive silica gel, and the heat transfer tubes along the sidewalls of the core pile are led out to the ground, and sequentially connected with the DC/DC converter, the battery and the electric equipment; the DC/DC converter, The outside of the battery and the electrical equipment is protected by a protective cover. The heat pipe is separately connected to the water pump II for liquid circulation in the heat pipe; the semiconductor temperature difference power generation piece realizes energy conversion through the temperature difference between the heat transfer tube and the heat pipe, and the obtained power is sequentially used by the wire. Connect the DC/DC converter and the battery to the power supply of the upper electrical equipment.

Wherein, the above semiconductor thermoelectric power generation chip has 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.

Specifically, the high-pressure rotary jet ferrule composite pile is composed of a high-pressure jet grouting pile and a core pile; wherein the high-pressure jet grouting pile has a pile diameter of 600-1000 mm and a pile length of 20-40 m. The grouting slurry is a cement slurry, and the cement is not less than 42.5 grades, and one or more of fine sand, fly ash, early strength agent, quick-setting agent or water glass may be added to the cement slurry; The pile length of the core pile is 20-40 m, which can be an I-shaped steel core pile, or a prestressed core pile, or a steel core pile. The cross-section height of the I-shaped steel core pile is 200-400 mm and the width is 200~. 400mm, web thickness 8 ~ 12mm, prestressed core pile external diameter is 600 ~ 800mm, wall thickness 150 ~ 300mm, steel tube core pile outer diameter is 500 ~ 800mm, wall thickness 8 ~ 12mm. The length of the core pile may be greater than, less than or equal to the length of the high pressure jet grouting pile, and the section of the high pressure jet grouting pile may be the length, upper, middle or lower part of the core pile.

The heat transfer tube is a polyethylene tube (also referred to as a PE tube), and the outer diameter, the wall thickness and the length thereof are determined according to the core pile length and the heat transfer tube buried tube arrangement. In a preferred embodiment, The outer diameter is 25 to 50 mm, the wall thickness is 5 to 8 mm, and the length is 40 to 150 m; the heat transfer tube is fixedly embedded in the side wall of the core pile; the heat transfer tube is buried in the form of a single U shape, a double U shape or W Any one or several combinations of forms.

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 a fan coil in the air conditioning device.

In the semiconductor thermoelectric power generation device 1, the thermal conductivity of the thermal conductive silica gel is 0.6 to 1.5 W/(m·K), and has high bonding performance and superior thermal conductivity, and is not solidified or electrically conductive. The thermal conductive protective layer is a stainless steel iron or silica-based composite material to prevent damage of the semiconductor thermoelectric power generation piece during construction; the DC/DC converter is located at the surface of the surface, and is a step-up DC/DC converter; Located on the surface, it 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.

In the semiconductor thermoelectric power generation device II, the heat dissipation pipe is a polyethylene pipe or a metal pipe, and has an outer diameter of 10 to 20 mm, a wall thickness of 3 to 4 mm, and a length of 5 to 15 m; and the power of the water pump II is 5~15w; 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 semiconductor temperature difference The DC/DC converter and the battery in the power generating device II are disposed on the inner side wall or the outer side wall of the core pile, and are protected from water and collision by the underground heat-dissipating device protective cover.

The invention further provides a construction method for a combined heat and power cogeneration high-pressure rotary jet ferrule composite pile system, comprising the following steps:

(1) Semiconductor temperature difference power generation device I: According to the design requirements, the heat transfer tube is selected, and the semiconductor thermoelectric power generation piece is pasted on the outer side of the heat transfer 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 sequentially connected with the DC/DC converter, the battery and the electric equipment; the heat transfer tube containing the semiconductor thermoelectric power generation piece is fixed on the side wall of the core pile;

(2) Semiconductor temperature difference power generation device II: According to the design requirements, the material and width of the heat-conducting bottom plate are selected, a uniform heat-dissipating tube is arranged on the heat-conducting bottom plate, and the heat-dissipating tube is wound around the heat-transfer tube to which the semiconductor thermoelectric power generation piece is attached, and connected The conductor of the semiconductor thermoelectric power generation chip is embedded in the thermal conductive silica gel, and the heat transfer tube along the sidewall of the core pile is led out of the ground, and is sequentially connected with the DC/DC converter, the battery and the electric equipment; the heat pipe is separately connected to the water pump II for the liquid in the heat dissipation pipe. Circulation; a protective cover is placed outside the DC/DC converter, battery, and electrical equipment;

(3) Construction of high-pressure rotary jet ferrule composite pile: According to the upper load, design and determine the form of high-pressure rotary jet ferrule composite pile, pile spacing and group pile arrangement form, type, length and diameter of core pile, high pressure rotary jet The length and diameter of the pile, the construction machinery, the type of nozzle and the concrete label; comprehensively consider the pile length, pile spacing, shallow geothermal energy reserves, the air conditioning system of the upper building and the energy demand of the electrical equipment, and design the heat pipe buried tube form; Making a core pile with a heat transfer tube, a semiconductor thermoelectric power generation device I, and a semiconductor thermoelectric power generation device II; a pilot hole for the mud wall, a high-pressure jet grouting pile to a design depth, a ferrule pile construction, and a high-pressure rotary jet ferrule composite pile system construction;

(4) Connection of refrigeration, heating and power supply system: The heat transfer tube is connected with the water pump I and the heat exchange equipment to form a shallow geothermal energy air conditioning system to provide cooling or heating for the upper building; the wire is sequentially connected with the DC/DC converter, The battery and the electrical equipment are connected to form a shallow geothermal energy temperature difference power generation system to provide power for the upper building (such as lighting LED light power, water pump II power consumption); according to the total amount of shallow geothermal energy reserves and the upper building power supply, For cooling or heating demand, you can choose only air conditioning system (cooling or heating), thermoelectric power generation system only (power supply), or air conditioning system and thermoelectric power generation system at the same time; finally realize the cogeneration high-pressure rotary jet ferrule composite pile Construction and application of the system.

Preferably, in the step (1), the semiconductor thermoelectric power generation chip is buried outside the heat transfer tube of 10 to 15 m or less; the buried tube is in the form of any one or a combination of a single U shape, a double U shape or a W form.

Advantageous Effects: Compared with the energy pile technology in the form of the existing pile-buried tube, the combined heat and cold power production high-pressure rotary jet ferrule composite pile of the present invention has the following technical advantages:

(1) On the basis of ensuring the load-bearing function of the upper load of the high-pressure rotary jet ferrule combined pile support, and the function of using the shallow geothermal energy for the cooling or heating of the upper building, the effective use of the heat exchange tube by the semiconductor thermoelectric power generation technology The temperature difference between the liquid and the soil increases the power generation function for the high-pressure rotary jet ferrule composite pile, which can be used to supply electricity to the upper building, which not only realizes the cold, heat and electricity co-production of the high-pressure rotary jet ferrule composite pile, but also realizes The single mining mode of shallow geothermal pure heat exchange to the composite mining mode of cogeneration;

(2) The existing geothermal temperature difference power generation system needs to be restricted by special construction sites (such as high temperature tunnels and oil fields), and can hardly be promoted in urban centers and residential areas. The present invention adopts the form of built pile foundation pipes without the need for Drilling and drilling alone increases the geographical approximation of geothermal power generation, and can use geothermal energy to generate electricity even in areas with high building volume ratios;

(3) The semiconductor thermoelectric power generation device I in the combined high-pressure rotary jet ferrule combined pile of cold, heat and power can use the temperature difference between the heat pipe and the soil to perform semiconductor temperature difference power generation, except that it is converted into a usable by a DC/DC converter. The electric energy is supplied to the upper part of the building, and the heat in the heat transfer tube is consumed by the thermoelectric conversion in the process of the thermoelectric power generation, and the heat of the liquid in the heat transfer tube is consumed by the heat exchange between the soil and the heat exchange tube in the conventional energy pile. It not only improves the efficiency of the geothermal air conditioning system, but also reduces the variation of the soil temperature during the heat dissipation of the heat transfer tube, and protects the thermal stability of the soil, thereby greatly improving the embedding of the heat exchange tubes in the unit formation space and time. Quantity and total amount of heat transfer;

(4) The semiconductor thermoelectric power generation device II in the combined high-pressure rotary-jet ferrule composite pile of cold, heat and power can use the temperature difference between the heat-dissipating tube and the liquid in the heat-exchange tube to perform semiconductor temperature difference power generation, after being converted by the DC/DC converter The liquid circulating water pump II in the heat pipe supplies power, and the heat of the heat transfer liquid in the heat exchange tube is consumed by the thermoelectric conversion. The laying of the heat pipe indirectly increases the heat exchange area of the heat transfer pipe in the ground, which not only improves the geothermal utilization rate in the unit space, but also Increased the efficiency of geothermal air conditioning systems;

(5) Shallow geothermal energy can be selected according to the needs of the upper building environment, only the air conditioning system (cooling or heating), only the thermoelectric system (power supply), or both the air conditioning system and the thermoelectric system, thus breaking the shallow geothermal energy. The pile foundation field can only be applied to the limitation of indoor air conditioning heating, realizing the on-demand switching of shallow geothermal energy application mode, realizing the on-demand and timely use of energy, and improving energy utilization 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 combined high-pressure rotary-jet ferrule composite pile system for cold, heat and power generation according to the present invention;

2 is a perspective view and a cross-sectional view showing a buried U-shaped heat transfer tube of an I-shaped steel core pile according to the present invention;

3 is a perspective view and a cross-sectional view showing a buried U-shaped heat transfer tube of a prestressed tubular pile in the present invention;

4 is a perspective view and a cross-sectional view showing the embedding form of a double U-shaped heat transfer tube of a prestressed tubular pile in the present invention;

Figure 5 is a perspective view and a cross-sectional view showing the embedding form of a W-shaped heat transfer tube of a prestressed tubular pile in the present invention;

Figure 6 is a perspective view and a cross-sectional view showing the embedded form of a single U-shaped heat transfer tube of a steel pipe core pile according to the present invention;

Figure 7 is a perspective view and a cross-sectional view showing the embedding form of a double U-shaped heat transfer tube of a steel pipe core pile according to the present invention;

Figure 8 is a perspective view and a cross-sectional view showing the embedding form of a W-shaped heat transfer tube of a steel pipe core pile according to the present invention;

Figure 9 is a cross-sectional view showing the arrangement of the semiconductor thermoelectric power generation apparatus 1 of the present invention;

Figure 10 is a cross-sectional view of a semiconductor thermoelectric power generation device I of the present invention;

Figure 11 is a cross-sectional view showing the arrangement of the semiconductor thermoelectric power generation device II of the present invention;

Figure 12 is a cross-sectional view of the semiconductor thermoelectric power generation device II of the present invention;

Figure 13 is a perspective view of a semiconductor thermoelectric power generation chip of the present invention;

Figure 14 is a cross-sectional view of a semiconductor thermoelectric power generation chip of the present invention;

In the figure: 1 is the core pile, 2 is the heat transfer tube, 3 is the high pressure jet grouting pile, 4 is the DC/DC converter, 5 is the battery, 6 is the wire, 7 is the water pump I, 8 is the water pump II, 9 is the valve 10 is heat exchange equipment, 11 is I-shaped steel core pile, 12 is prestressed core pile, 13 is steel core pile, 14 is electrical equipment, 15 is semiconductor thermoelectric power generation device I, 16 is P-type semiconductor, 17 It is an N-type semiconductor, 18 is a metal piece, 19 is a heat conducting plate, 20 is a hot end, 21 is a cold end, 22 is a thermal conductive protective layer, 23 is a thermal conductive silica gel, 24 is a semiconductor thermoelectric power generation sheet, and 25 is a semiconductor thermoelectric power generation device II 26 is a heat pipe, 27 is a heat conductive bottom plate, and 28 is a protective cover.

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 combination of cold and heat electricity production high pressure rotary jet ferrule. The air conditioning system includes a heat exchange device, and the heat exchange device is disposed 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 heat transfer tube is first heat exchanged with the soil body, and then the upper heat exchange device is connected thereto. Adjust the indoor temperature inside the building.

The thermoelectric power generation system includes a semiconductor thermoelectric power generation device I and a semiconductor thermoelectric power generation device II. 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. The semiconductor thermoelectric power generation sheet is bonded to the outside of the heat transfer tube by using a thermal conductive silicone. A heat conduction protection layer is disposed outside the semiconductor temperature difference power generation piece, and the semiconductor temperature difference power generation piece realizes thermoelectric conversion by using a temperature difference between the heat transfer tube and the pile side soil body, and the power obtained by the semiconductor temperature difference power generation is sequentially connected to the DC/DC converter by using a wire. The battery is used for the power supply of the upper electrical equipment. The semiconductor thermoelectric power generation device II comprises a heat dissipation tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silica gel and a heat conductive bottom plate. The heat dissipation tube is evenly arranged on the heat conduction substrate, and the heat dissipation tube is wound around the heat transfer tube to which the semiconductor thermoelectric power generation sheet is attached, and the semiconductor temperature difference power generation is connected. The wire of the piece is embedded in the thermal silica gel, and the heat transfer tube along the side wall of the core pile is led out of the ground, and is sequentially connected with the DC/DC converter, the battery and the electric equipment; the heat pipe is separately connected to the water pump II for circulating the liquid in the heat pipe; The semiconductor thermoelectric power generation piece realizes energy conversion through the temperature difference between the heat transfer tube and the heat dissipation tube, and the obtained electric power is sequentially connected to the power supply of the DC/DC converter and the battery for the upper electric equipment by using the electric wire.

The construction method of the combined high-pressure rotary jet ferrule composite pile system of the present invention will be described in detail below.

First, as shown in Fig. 1, according to the upper load amount, design and determine the form of the high-pressure rotary jet ferrule composite pile, the pile spacing and the group pile arrangement form, the type, length and diameter of the core pile, and the length of the high-pressure jet grouting pile 3. , diameter, construction machinery, nozzle type and concrete label; preferably high-pressure rotary jet ferrule composite pile, which is composed of high-pressure jet grouting pile 3 and core pile 1; the high-pressure jet-jet pile 3 has a pile diameter of 600-1000mm (800mm in this embodiment), the pile length is 20-40m (30m in this embodiment), the grouting slurry is cement slurry, the cement label is not less than 42.5 grade, and the fine sand and fly ash can be added to the cement slurry. One or more of early strength agent, quick-setting agent or water glass (this embodiment is a 42.5 grade cement slurry). The pile length of the core pile 1 is 20 to 40 m (30 m in this embodiment), and It is an I-shaped steel core pile 11 (shown in Figure 2), or a prestressed core pile 12 (shown in Figures 3 to 5), or a steel core pile 13 (shown in Figures 6-8). The cross-section height of the shape steel core pile 11 is 200-400 mm, the width is 200-400 mm, the web thickness is 8-12 mm, and the outer diameter of the prestressed core pile 12 is 600-800 mm, the wall thickness is 150-300 mm, and the steel core pile 13 is outside. The diameter is 500-800mm, the wall thickness is 8-12mm (the prestressed core pile 12 in this embodiment, the outer diameter is 600mm, the wall thickness is 150mm); the length of the core pile 1 can be greater than, less than or equal to the high pressure jet grouting pile 3 The length (the length of the embodiment is equal), the section of the high-pressure jet grouting pile 3 reinforcement may be the length, the upper part, the middle part or the lower part of the core pile 1 (the length of the embodiment is long).

Then, considering the pile length, pile spacing, shallow geothermal energy reserves, the air conditioning system of the upper building and the energy demand of the electrical equipment, design the heat transfer tube 2 buried tube form; preferably the heat transfer tube 2 is a polyethylene tube ( Also known as PE pipe), its outer diameter is 25 ~ 50mm, the wall thickness is 5 ~ 8mm, the length is 40 ~ 150m (in this embodiment, the outer diameter is 30mm, the wall thickness is 5mm, the length is 100m), according to the core pile 1 The length of the pile and the arrangement of the heat transfer tube 2 need to be determined; the heat transfer tube 2 is fixedly embedded in the side wall of the core pile 1; the heat transfer tube 2 can be in the form of a single U-shaped, double U-shaped or W-shaped one. Or several combinations (this embodiment is a double U shape).

Then, a semiconductor thermoelectric power generation device I 15 is produced: as shown in FIG. 9, at the design position outside the heat transfer tube 2, the semiconductor thermoelectric power generation sheet 24 is bonded by the thermal conductive silica gel 23, and the wire 6 connected to the semiconductor thermoelectric power generation sheet 24 is buried in the heat conduction. The inside of the silica gel 23 is taken out and connected to the DC/DC converter 4, the battery 5 and the electric device 14; the heat transfer tube 2 containing the semiconductor thermoelectric power generation piece 24 is fixed to the side wall of the core pile 1; preferably, the semiconductor thermoelectric power generation The sheet 24 is mainly embedded outside the heat transfer tube 2 of 10 to 15 m; preferably, the thermal conductivity of the thermal conductive silica gel 23 is 0.6 to 1.5 W/(m·K), which has high bonding performance and superior thermal conductivity, and is not solid. The conductive conductive layer 22 is preferably a stainless steel iron or silica gel based composite material to prevent the semiconductor thermoelectric power generation sheet 24 from being damaged during construction; preferably the DC/DC converter 4 is located at the surface of the ground. a compact DC/DC converter 4; preferably a battery 5, located at the surface, 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 lithium ion battery); preferably a wire 6, buried It is disposed in the thermal conductive silica gel 23. Manufacturing a semiconductor thermoelectric power generation device II 25: selecting the material and width of the heat-conducting bottom plate 27 according to design requirements, arranging a uniform heat-dissipating tube 26 on the heat-conducting bottom plate 27, and winding the heat-dissipating tube 26 around the heat-transfer tube to which the semiconductor temperature difference power generating sheet 24 is attached 2 outside, the wire 6 connecting the semiconductor thermoelectric power generation piece 24 is embedded in the thermal conductive silica gel 23, and is taken out along the heat transfer tube 2 on the side wall of the core pile 1 to be connected to the DC/DC converter 4, the battery 5, and the electric device 14. The heat pipe 26 is separately connected to the water pump II 8 for circulating the liquid in the heat pipe 26.

The DC/DC converter 4 and the battery 5 in the semiconductor thermoelectric power generation device II 25 (shown in FIGS. 11 to 12) are disposed on the inner side wall or the outer side wall of the core pile 1, and are protected from water and collision by the underground heat dissipation device cover 28. . Preferably, the heat pipe 26 is a polyethylene pipe having an outer diameter of 10 to 20 mm, a wall thickness of 3 to 4 mm, and a length of 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). Wrapped around the outside of the heat transfer tube 2, and the circulating flow of the liquid in the heat pipe 26 is provided by the water pump II8; preferably, the water pump II8 has a power of 5 to 15w (5w in this embodiment); preferably the DC/DC converter 4 , is a step-up DC/DC converter 4; preferably The battery 5 is one of a lead battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery. This embodiment is a lithium ion battery.

The above-mentioned semiconductor thermoelectric power generation chip has a semiconductor thermoelectric power generation chip which is commonly used in the prior art, and its structure is as shown in FIGS. 13 to 14, including a hot end 20, a cold end 21, a P-type semiconductor 16, an N-type semiconductor 17, and a metal piece. 18 and a heat conducting plate 19.

Then, the mud retaining wall is provided with a pilot hole, the high-pressure jet grouting pile 3 is constructed to the design depth, and the heat transfer tube 2, the semiconductor thermoelectric power generation device I 15 and the core pile 1 of the semiconductor thermoelectric power generation device II 25 are inserted to complete the high-pressure rotary jetting. The construction of the ferrule composite pile system.

Finally, the air conditioning system is connected: the heat transfer tube 2 is connected with the water pump I 7 and the heat exchange device 10 to form a shallow geothermal air conditioning system to provide cooling or heating to the upper building; preferably, the water pump I 7 is located at the surface, and the power is 0.55 to 1.2 kW; preferably the valve 9 is an electric two-way valve; preferably the heat exchange device 10 is a fan coil in an air conditioning apparatus. Connecting the thermoelectric power generation system: connecting the wire 6 with the DC/DC converter 4, the battery 5 and the electric equipment 14 to form a shallow geothermal energy temperature difference power generation system, providing power for the upper building (such as lighting LED lamp power, water pump II power) Electricity); depending on the total amount of shallow geothermal energy reserves and the demand for power, 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. The system is used at the same time; finally realize the construction and application of the combined high-pressure rotary jet ferrule composite pile system of cogeneration.

The cogeneration high-pressure rotary jet ferrule composite pile of the invention is a novel multi-functional composite energy application system, which provides the function of supporting the load of the upper building load, and uses the shallow geothermal energy to cool or heat the upper building. In addition to the function, it is also possible to use the temperature difference between the liquid and the soil in the heat exchange tube to generate electric energy for supplying electricity to the upper building, and to improve the heat exchange efficiency between the heat exchange tube and the soil; the system not only effectively realizes the high pressure swirling The composite use of ferrule composite piles in the three aspects of mechanics, thermals and electricity, and the realization of shallow geothermal energy on-demand and wrong-time multi-objective effective utilization, improve energy utilization efficiency.

Claims (10)

A combined heat and power cogeneration high-pressure rotary jet ferrule composite pile system, characterized in that the system comprises: a high-pressure rotary jet ferrule composite pile, a heat transfer tube, an air conditioning system and a thermoelectric power generation system; The air conditioning system comprises a heat exchange device, the heat exchange device is arranged above the heat transfer tube, and 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 first exchanged with the soil body, and then the upper heat exchange is connected. Equipment to regulate the indoor temperature in the building; 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 I realizes thermoelectric conversion using a temperature difference between a heat transfer tube and a pile-side soil body, and obtains the obtained The electric power is supplied to the electric power of the upper electric equipment; the semiconductor thermoelectric power generation device II realizes energy conversion by using the temperature difference between the heat transfer tube and the heat dissipating tube, and supplies the obtained electric power to the electric power of the upper electric equipment. The combined heat and power generation high-pressure rotary jet ferrule assembly system according to claim 1, wherein said semiconductor thermoelectric power generation device 1 comprises a semiconductor thermoelectric power generation chip, a thermal conductive silica gel and a thermal conductive protective layer, and said semiconductor temperature difference The power generation sheet is bonded to the outside of the heat transfer tube by using a thermal conductive silica gel, and a heat conduction protection layer is disposed outside the semiconductor temperature difference power generation sheet. The semiconductor temperature difference power generation sheet realizes thermoelectric conversion by using a temperature difference between the heat transfer tube and the pile side soil body, and uses a wire to heat the semiconductor temperature difference. The obtained power is sequentially connected to a power supply of a DC/DC converter and a battery for an upper electric device. The combined heat and power generation high-pressure rotary jet ferrule assembly system according to claim 1, wherein the semiconductor thermoelectric power generation device II comprises a heat dissipation tube, a semiconductor thermoelectric power generation sheet, a thermal conductive silicone, and a heat conductive bottom plate, The heat pipe is evenly arranged on the heat conducting substrate and wrapped around the heat transfer tube to which the semiconductor temperature difference power generating sheet is attached, and the wire connecting the semiconductor temperature difference power generating piece is buried in the heat conductive silica gel, and the heat transfer tube along the side wall of the core pile leads out to the ground, and It is connected with DC/DC converter, battery and electrical equipment in turn; protective cover is provided on the outside of DC/DC converter, battery and electrical equipment; heat pipe is connected separately to water pump II for liquid circulation in heat pipe; semiconductor temperature difference power generation chip passes The temperature difference between the heat transfer tube and the heat pipe realizes energy conversion, and the obtained power is sequentially connected to the power supply of the DC/DC converter and the battery for the upper electric equipment by using the wire. The high-pressure rotary-jet ferrule composite pile system according to claim 1 , wherein the high-pressure rotary jet ferrule composite pile is composed of a high-pressure rotary jetting pile and a core pile; The high-pressure jet grouting pile has a pile diameter of 600-1000 mm and a pile length of 20-40 m. The grouting slurry is cement slurry, and the cement label is not less than 42.5. The cement slurry can be added with fine sand and pulverized coal. One or more of ash, early strength agent, quick-setting agent or water glass; the core pile has a pile length of 20 to 40 m, and may be an I-shaped steel core pile or a prestressed core pile, or For the steel pipe core pile, the cross-section height of the I-shaped steel core pile is 200-400 mm, the width is 200-400 mm, and the web thickness is 8-12 mm. The outer diameter of the prestressed core pile is 600-800 mm, the wall thickness is 150-300 mm, and the outer diameter of the steel core pile is 500-800 mm and the wall thickness is 8-12 mm. The cogeneration high-pressure rotary jet ferrule composite pile system according to claim 1, wherein the heat transfer tube is a polyethylene pipe, and an outer diameter, a wall thickness and a length thereof are according to a core pile length and The heat transfer tube buried pipe arrangement form needs to be determined; the heat transfer tube is fixedly embedded in the core pile side wall; the heat transfer tube buried tube is in the form of any one or several combinations of a single U shape, a double U shape or a W form. The combined heat and power generation high-pressure rotary jet ferrule composite pile system according to claim 1, wherein the water pump I is located at a surface of the earth, and the power thereof is 0.55 to 1.2 kW; and the valve is an electric two-way valve; The heat exchange device is a fan coil in an air conditioner. The combined heat and power generation high-pressure rotary jet ferrule pile system according to claim 2, wherein in the semiconductor thermoelectric power generation device 1, the thermal conductivity of the thermal conductive silica gel is 0.6 to 1.5 W/(m) · K), with high bonding performance and super thermal conductivity, will not be solidified, will not conduct electricity; the thermal protective layer is stainless steel iron or silica-based composite material to prevent semiconductor temperature difference power generation sheet during construction Damaged; the DC/DC converter is located at the surface and is a step-up DC/DC converter; the battery 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; Inside the thermal silica gel. The combined heat and power generation high-pressure rotary jet ferrule composite pile system according to claim 3, wherein in the semiconductor thermoelectric power generation device II, the heat dissipation pipe is a polyethylene pipe or a metal pipe, and an outer diameter thereof 10 to 20 mm, wall thickness of 3 to 4 mm, length of 5 to 15 m; power of the water pump II is 5 to 15 w; the DC/DC converter is a step-up DC/DC converter; a lead storage battery or a lithium ion battery or a lithium ion polymer battery or a nickel cadmium battery; the DC/DC converter and the battery in the semiconductor thermoelectric power generation device II are disposed on the inner side wall or the outer side wall of the core pile, and are cooled by underground The equipment cover is waterproof and anti-collision protection. A construction method for a combined heat and power cogeneration high-pressure rotary jet ferrule composite pile system, characterized in that the method comprises the following steps: (1) Semiconductor temperature difference power generation device I: According to the design requirements, the heat transfer tube is selected, and the semiconductor thermoelectric power generation piece is pasted on the outer side of the heat transfer 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 sequentially connected with the DC/DC converter, the battery and the electric equipment; the heat transfer tube containing the semiconductor thermoelectric power generation piece is fixed on the side wall of the core pile; (2) Semiconductor temperature difference power generation device II: According to the design requirements, the material and width of the heat-conducting bottom plate are selected, a uniform heat-dissipating tube is arranged on the heat-conducting bottom plate, and the heat-dissipating tube is wound around the heat-transfer tube to which the semiconductor thermoelectric power generation piece is attached. On the side, the wires connecting the semiconductor thermoelectric power generation chips are buried in the thermal conductive silica gel, and the heat transfer tubes along the sidewalls of the core pile are led out to the ground, and sequentially connected with the DC/DC converter, the battery and the electric equipment; the heat dissipation pipes are separately connected to the water pump II for supply Liquid circulation in the heat pipe; a protective cover is arranged outside the DC/DC converter, the battery and the electric equipment; (3) Construction of high-pressure rotary jet ferrule composite pile: According to the upper load, design and determine the form of high-pressure rotary jet ferrule composite pile, pile spacing and group pile arrangement form, type, length and diameter of core pile, high pressure rotary jet The length and diameter of the pile, the construction machinery, the type of nozzle and the concrete label; comprehensively consider the pile length, pile spacing, shallow geothermal energy reserves, the air conditioning system of the upper building and the energy demand of the electrical equipment, and design the heat pipe buried tube form; Making a core pile with a heat transfer tube, a semiconductor thermoelectric power generation device I, and a semiconductor thermoelectric power generation device II; a pilot hole for the mud wall, a high-pressure jet grouting pile to a design depth, a ferrule pile construction, and a high-pressure rotary jet ferrule composite pile system construction; (4) Connection of refrigeration, heating and power supply system: The heat transfer tube is connected with the water pump I and the heat exchange equipment to form a shallow geothermal energy air conditioning system to provide cooling or heating for the upper building; the wire is sequentially connected with the DC/DC converter, The battery and the electrical equipment are connected to form a shallow geothermal energy temperature difference power generation system to provide power for the upper building; according to the total amount of shallow geothermal energy reserves and the demand for power supply, cooling or heating of the upper building, only the air conditioning system can be selected, only The thermoelectric power generation system, or the air conditioning system and the thermoelectric power generation system are used at the same time; finally, the construction and application of the high-pressure rotary jet ferrule composite pile system of the cogeneration of the cogeneration. The construction method according to claim 9, wherein in the step (1), the semiconductor thermoelectric power generation chip is buried outside the heat transfer tube of 10 to 15 m; and the buried tube is in the form of a single U, a double U or a W. Any one or combination of several.

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