CN214581875U

CN214581875U - EHT coupling heat exchange well system that depth combines

Info

Publication number: CN214581875U
Application number: CN202120608481.XU
Authority: CN
Inventors: 沈国华
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-11-02
Anticipated expiration: 2031-03-25

Abstract

An EHT coupling heat exchange well system combining depth and depth. The system comprises a middle-deep layer main well, a plurality of auxiliary shallow wells, a high-temperature water connecting pipeline, a low-temperature water connecting pipeline and an internal circulating pump; the utility model provides an EHT coupling heat transfer well system that depth combined has following beneficial effect: the deep main well can be utilized to raise the temperature of the soil around the auxiliary shallow well in non-heat supply seasons, so that the auxiliary shallow well is subjected to heat storage, the total heat provided for a user terminal can be increased in the heat supply seasons, high-efficiency and low-cost heat storage across seasons is realized, the sustainable, high-cost-performance and environment-friendly development of geothermal energy can be improved on the premise of not greatly increasing the cost and the occupied area, and the energy of geothermal energy can be fully utilized. In addition, the shallow U-shaped buried pipe made of two materials of heat dissipation and heat preservation can further improve the heat storage and heat extraction effects.

Description

EHT coupling heat exchange well system that depth combines

Technical Field

The utility model belongs to the technical field of geothermal well heat transfer, especially, relate to an EHT (reinforcing heat transfer) coupling heat transfer well system that depth combines.

Background

The geothermal well heat exchange technology is an environment-friendly heat exchange approach, can thoroughly solve the dependence on underground water resources, and avoids the problems of underground water level reduction, underground water pollution, heat pollution and the like, but the core heat exchange technology is not broken through, so that the geothermal well heat exchange technology has the defects of high cost, small output, low energy efficiency and the like, although the single well heat exchange amount of a middle-deep layer heat exchange well is larger, the investment is higher, the analysis is carried out from the input-output ratio, and the economy is lacked; the traditional shallow buried pipe has low investment, but has low heat extraction quantity and can not continuously extract heat. The two geothermal development technologies do not have commercial popularization value. The sustainable, high cost performance and environmental protection development of the geothermal energy is a big premise for the utilization of the geothermal energy in the future, so the original heat exchange technology must be broken through

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a depth-combined EHT coupled heat exchange well system.

In order to achieve the above object, the present invention provides a depth-combined EHT coupled heat exchange well system, which comprises a middle-deep main well, a plurality of auxiliary shallow wells, a high-temperature water connection pipeline, a low-temperature water connection pipeline, an internal circulation pump, a deep U-shaped buried pipe and a shallow U-shaped buried pipe; wherein, a deep U-shaped buried pipe is arranged in the middle-deep layer main well; a shallow U-shaped buried pipe is arranged in the auxiliary shallow well; the water inlet and the water outlet of each shallow U-shaped buried pipe are respectively connected with the water outlet and the water inlet of each deep U-shaped buried pipe through a high-temperature water connecting pipeline and a low-temperature water connecting pipeline; the internal circulating pump is arranged on the high-temperature water connecting pipeline or the low-temperature water connecting pipeline; the water outlet of the middle-deep layer main well and the water outlets of the auxiliary shallow wells are respectively connected with a heat pump unit through a hot water collecting pipe through circulating pipelines, and the outlet of the heat pump unit is connected with a user terminal through a pipeline; the water inlet of the middle-deep layer main well and the water inlets of the auxiliary shallow wells are respectively connected with a user terminal through a circulating pipeline and a return water collecting pipe.

The shallow U-shaped buried pipe is composed of a well entering section pipeline and a well exiting section pipeline, wherein the well entering section pipeline is made of a heat dissipation material, and the well exiting section pipeline is made of a heat insulation material.

The depth of the middle-deep main well is less than or equal to 6000 meters, and the depth of the auxiliary shallow well is less than or equal to 1000 meters.

The deep U-shaped buried pipe can be replaced by a heat exchange pipe; the heat exchange pipe is vertically arranged in the deep main well, the lower end of the heat exchange pipe is in an open shape, and a distance is reserved between the heat exchange pipe and the bottom surface of the deep main well; at the moment, the water inlet and the water outlet of each shallow U-shaped buried pipe are respectively connected with the upper end port of the heat exchange pipe and the deep main well through a high-temperature water connecting pipeline and a low-temperature water connecting pipeline.

The utility model provides an EHT coupling heat transfer well system that depth combined has following beneficial effect:

the deep main well can be utilized to raise the temperature of the soil around the auxiliary shallow well in non-heat supply seasons, so that the auxiliary shallow well is subjected to heat storage, the total heat provided for a user terminal can be increased in the heat supply seasons, high-efficiency and low-cost heat storage across seasons is realized, the sustainable, high-cost-performance and environment-friendly development of geothermal energy can be improved on the premise of not greatly increasing the cost and the occupied area, and the energy of geothermal energy can be fully utilized. In addition, the shallow U-shaped buried pipe made of two materials of heat dissipation and heat preservation can further improve the heat storage and heat extraction effects.

Drawings

Fig. 1 is a top view of the EHT coupled heat exchange well system with depth combination provided by the present invention.

Fig. 2 is a front view of the working principle of the depth-combined EHT coupled heat exchange well system provided in embodiment 1 during non-heating seasons.

Fig. 3 is a schematic diagram of the working principle of the combined depth EHT coupled heat exchange well system provided in embodiment 1 during the hot season.

Fig. 4 is a front view of a deep main well site structure in an EHT coupled heat exchange well system with deep and shallow junctions according to embodiment 2 during non-heating seasons.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 1 to 3, the depth-combined EHT-coupled heat exchange well system provided by the present embodiment includes a middle-deep main well 1, a plurality of auxiliary shallow wells 2, a high-temperature water connecting pipeline 3, a low-temperature water connecting pipeline 4, an internal circulating pump 5, a deep U-shaped buried pipe 6, and a shallow U-shaped buried pipe 7; wherein, a deep U-shaped buried pipe 6 is arranged in the middle-deep layer main well 1; a shallow U-shaped buried pipe 7 is arranged in the auxiliary shallow well 2; the water inlet and the water outlet of each shallow U-shaped buried pipe 7 are respectively connected with the water outlet and the water inlet of a deep U-shaped buried pipe 6 through a high-temperature water connecting pipeline 3 and a low-temperature water connecting pipeline 4; the internal circulating pump 5 is arranged on the high-temperature water connecting pipeline 3 or the low-temperature water connecting pipeline 4; the water outlet of the middle-deep layer main well 1 and the water outlets of the auxiliary shallow wells 2 are respectively connected with a heat pump unit 9 through a hot water collecting pipe 8 through circulating pipelines, and the outlet of the heat pump unit 9 is connected with a user terminal 11 through a pipeline; the water inlet of the middle-deep layer main well 1 and the water inlets of the auxiliary shallow wells 2 are respectively connected with a user terminal 11 through a circulating pipeline and a return water collecting pipe 10.

The shallow U-shaped buried pipe 7 is composed of a well entering section pipeline 7-1 and a well exiting section pipeline 7-2, wherein the well entering section pipeline 7-1 is made of a heat dissipation material, and the well exiting section pipeline 7-2 is made of a heat insulation material.

The depth of the middle-deep main well 1 is less than or equal to 6000 meters, and the depth of the auxiliary shallow well 2 is less than or equal to 1000 meters.

The working principle of the depth-combined EHT coupled heat exchange well system provided by the present embodiment is described as follows:

in non-heating seasons, as shown in fig. 2, the valve on the circulation pipeline is closed and the internal circulation pump 5 is opened. Utilize internal circulation pump 5 to extract the high temperature circulating water in the dark U type buried pipe 6, send this high temperature circulating water into shallow U type buried pipe 7 through high temperature water connecting line 3 in, because the temperature ratio of high temperature circulating water is higher, and has surpassed the temperature of shallow U type buried pipe 7 bottom circulating water, consequently in shallow U type buried pipe 7 last circulation back, through exchanging the heat and having promoted the soil temperature around the shallow U type buried pipe 7, be a heat accumulation process to supplementary shallow well 2 promptly. The high-temperature circulating water passes through the shallow U-shaped buried pipe 7 and then becomes low-temperature circulating water, and then flows back into the deep U-shaped buried pipe 6 through the low-temperature water connecting pipeline 4. In addition, because the shallow U-shaped buried pipe 7 is made of two materials of heat dissipation and heat preservation, when high-temperature circulating water passes through the well entering section pipeline 7-1 made of the heat dissipation material, heat is rapidly transferred to soil around the shallow U-shaped buried pipe 7, and the well exiting section pipeline 7-2 made of the heat preservation material can preserve heat of the cooled low-temperature circulating water, so that high-efficiency and low-cost heat storage in a season-crossing mode can be achieved.

In the heating season, as shown in fig. 3, the valve on the circulation line is opened and the operation of the internal circulation pump 5 is stopped. At this time, cold circulating water which comes from the user terminal 11 and performs superheat exchange with indoor air respectively flows into the deep U-shaped buried pipe 6 and the shallow U-shaped buried pipe 7 through the return water collecting pipe 10 and each circulating pipeline under the dual action of pressurization and gravity of a system circulating pump, and in the process of flowing through the deep U-shaped buried pipe 6 and the shallow U-shaped buried pipe 7, the cold circulating water performs heat exchange with the ground through the pipe walls of the deep U-shaped buried pipe 6 and the shallow U-shaped buried pipe 7, absorbs heat from the ground to become hot circulating water, and then flows into the heat pump unit 9 through the hot water collecting pipe 8 through the circulating pipeline; finally flows into the user terminal 11 through the corresponding pipeline; in the user terminal 11, the hot circulating water exchanges heat with the air of the indoor space, thereby maintaining the indoor space at an appropriate temperature.

Example 2:

as shown in fig. 4, the depth-combined EHT-coupled heat exchange well system provided by the present embodiment is that the deep U-shaped buried pipe 6 is replaced by a heat exchange pipe 12; the heat exchange pipe 12 is vertically arranged in the deep main well 1, the lower end of the heat exchange pipe is in an opening shape, and a distance is reserved between the heat exchange pipe and the bottom surface of the deep main well 1; at this time, the water inlet and the water outlet of each shallow U-shaped buried pipe 7 are respectively connected with the upper end port of the heat exchange pipe 12 and the deep main well 1 through the high-temperature water connecting pipeline 3 and the low-temperature water connecting pipeline 4. The other structures are the same.

In non-heat supply seasons, the valve on the circulating pipeline is closed, and the internal circulating pump 5 is started. Utilize internal circulation pump 5 to extract the high temperature circulating water in the heat exchange tube 12, send this high temperature circulating water into shallow U type buried pipe 7 through high temperature water connecting line 3 in, because the temperature ratio of high temperature circulating water is higher, and has surpassed the temperature of shallow U type buried pipe 7 bottom circulating water, consequently in shallow U type buried pipe 7 internal continuous circulation back, promoted the soil temperature around shallow U type buried pipe 7 through the exchange heat, be a heat accumulation process to supplementary shallow well 2 promptly. The high-temperature circulating water passes through the shallow U-shaped buried pipe 7 to become low-temperature circulating water, then flows back into the deep main well 1 through the low-temperature water connecting pipeline 4, then flows downwards to the bottom of the well along the annular space of the well wall, then flows into the inside of the heat exchange pipe 12 from the opening at the lower end of the heat exchange pipe 12, and then flows upwards in the heat exchange pipe 12.

The operation of the heating season is the same as that of embodiment 1, and will not be described again.

Claims

1. The utility model provides a depth EHT coupling heat exchange well system that combines which characterized in that: the depth-combined EHT coupling heat exchange well system comprises a middle-deep layer main well (1), a plurality of auxiliary shallow wells (2), a high-temperature water connecting pipeline (3), a low-temperature water connecting pipeline (4), an internal circulating pump (5), a deep U-shaped buried pipe (6) and a shallow U-shaped buried pipe (7); wherein, a deep U-shaped buried pipe (6) is arranged in the middle-deep layer main well (1); a shallow U-shaped buried pipe (7) is arranged in the auxiliary shallow well (2); the water inlet and the water outlet of each shallow U-shaped buried pipe (7) are respectively connected with the water outlet and the water inlet of a deep U-shaped buried pipe (6) through a high-temperature water connecting pipeline (3) and a low-temperature water connecting pipeline (4); the internal circulating pump (5) is arranged on the high-temperature water connecting pipeline (3) or the low-temperature water connecting pipeline (4); the water outlet of the middle-deep layer main well (1) and the water outlets of the auxiliary shallow wells (2) are respectively connected with a heat pump unit (9) through a hot water collecting pipe (8) through a circulating pipeline, and the outlet of the heat pump unit (9) is connected with a user terminal (11) through a pipeline; the water inlet of the middle-deep layer main well (1) and the water inlets of the auxiliary shallow wells (2) are respectively connected with a user terminal (11) through a circulating pipeline and a return water collecting pipe (10).

2. The deep-shallow combined EHT coupled heat exchange well system of claim 1, wherein: the shallow U-shaped buried pipe (7) is composed of a well entering section pipeline (7-1) and a well exiting section pipeline (7-2), wherein the well entering section pipeline (7-1) is made of a heat dissipation material, and the well exiting section pipeline (7-2) is made of a heat insulation material.

3. The deep-shallow combined EHT coupled heat exchange well system of claim 1, wherein: the depth of the middle-deep main well (1) is less than or equal to 6000 meters, and the depth of the auxiliary shallow well (2) is less than or equal to 1000 meters.

4. The deep-shallow combined EHT coupled heat exchange well system of claim 1 or 3, wherein: the deep U-shaped buried pipe (6) can be replaced by a heat exchange pipe (12); the heat exchange pipe (12) is vertically arranged in the deep main well (1), the lower end of the heat exchange pipe is in an open shape, and a distance is reserved between the heat exchange pipe and the bottom surface of the deep main well (1); at the moment, the water inlet and the water outlet of each shallow U-shaped buried pipe (7) are respectively connected with the upper end port of the heat exchange pipe (12) and the deep main well (1) through a high-temperature water connecting pipeline (3) and a low-temperature water connecting pipeline (4).