Solar energy and medium-deep-layer and shallow-layer geothermal energy coupling heat supply and storage system

Abstract

The utility model provides a solar energy and medium-deep layer and shallow layer geothermal energy coupling heat supply and storage system, and belongs to the field of new energy heat supply and storage. The system comprises a medium-deep layer geothermal energy heat supply unit, a shallow layer geothermal energy heat supply unit, a solar heat supply unit, a water collecting and distributing unit and a heat consumer unit. The system provided by the utility model not only can realize a winter heating function of complementary coupling of solar energy, middle-deep geothermal energy and shallow geothermal energy, but also can store solar energy heat in shallow soil and middle-deep rock-soil bodies to realize a summer heat storage function; initial investment of a coupling heat supply system can be effectively reduced, the shallow geothermal energy occupied area is reduced, and the reliability and the resource utilization rate of the system are improved; solar heat is stored in shallow soil and middle-deep rock-soil bodies, the phenomenon that geothermal energy of the shallow soil is not uniform in cold and hot is effectively relieved, the service life of the shallow soil is prolonged, the outlet water temperature in the heat supply period of the middle-deep rock is increased, and the resource utilization rate and economical efficiency are further improved.

Description

Technical Field

[0001] The utility model belongs to the field of new energy heating and heat storage, and particularly relates to a solar energy and medium-deep and shallow geothermal energy coupling heating and heat storage system. Background Art

[0002] Geothermal resources refer to geothermal energy, geothermal fluids and their useful components inside the earth that can be used economically by humans. Geothermal resources can be divided into three types: shallow geothermal energy, hydrothermal geothermal energy and rock geothermal energy. Shallow geothermal energy is the heat contained in rock and soil, groundwater, and surface water within a depth of less than 200m from the surface. The temperature is usually below 25°C, and heat pump technology is used to extract heat. Hydrothermal geothermal resources are produced by mining geothermal water, extracting heat from the water, and then injecting the geothermal water back into the ground. Hot dry rocks generally have a temperature greater than 180°C and are buried thousands of meters deep. They are high-temperature rock bodies with no fluid or only a small amount of underground fluid (dense and impermeable) inside. Medium-deep geothermal heat belongs to rock-thermal geothermal energy, which is stored in underground rock and soil. The heat source is the internal heat of the earth, which is mainly formed by the decay and fission of elements inside the earth. Geothermal energy is a renewable energy source with the characteristics of continuous stability, safety and reliability, and clean zero carbon. Geothermal energy is a clean energy like solar energy, wind energy, biomass energy and hydropower. Compared with other clean energy sources, geothermal energy has the highest utilization coefficient, which can reach 67%.

[0003] At present, the investment in medium-deep geothermal construction is relatively high. The construction cost of a heating system that uses all medium-deep geothermal heat is high and the economic benefits are poor. Shallow soil buried pipes need to occupy a large area, and "cold pit" phenomenon will occur when used in the northern cold and heat imbalance areas. Utility Model Content

[0004] In view of the problems existing in the prior art in the above-mentioned background technology, the utility model provides a solar energy and medium-deep and shallow geothermal energy coupled heating and storage system, which couples medium-deep geothermal heat, shallow soil buried pipes and solar energy for heating, which can effectively reduce the initial investment in deep geothermal heat in the coupled heating system, reduce the area occupied by geothermal energy, and improve the reliability and utilization rate of solar energy resources.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A solar energy coupled with medium-deep and shallow geothermal energy heating and storage system, comprising:

[0007] A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy, the medium-deep geothermal energy heating unit comprising a medium-deep geothermal coaxial shell-and-tube heat exchanger and a medium-deep geothermal heat pump unit connected by a medium-deep heat source side circulation pipeline loop;

[0008] A shallow geothermal energy heating unit for extracting shallow soil geothermal energy, the shallow geothermal energy heating unit comprising a shallow soil buried pipe and a shallow soil source heat pump unit connected by a shallow heat source side circulation pipeline loop;

[0009] A solar heating unit for converting solar energy into thermal energy, the solar heating unit comprising a solar collector and a solar heating water storage tank connected by a solar circulation pipeline loop;

[0010] A water collection and diversion unit for collecting and diverting waterways, the water collection and diversion unit comprising a water collector and a water diverter;

[0011] heat user units, including heat user heaters;

[0012] The water inlet side of the water collector is respectively connected to the solar heating water storage tank, the medium-deep rock heat heat pump unit, and the shallow soil source heat pump unit, and the water outlet side of the water collector is respectively connected to the heat user heater, the water supply pipe of the medium-deep heat source side circulation pipeline, and the water supply pipe of the shallow heat source side circulation pipeline;

[0013] The water inlet side of the water distributor is connected to the heat user heater, and the water outlet side of the water distributor is respectively connected to the solar heating water storage tank, the medium-deep rock heat heat pump unit, and the shallow soil source heat pump unit.

[0014] Furthermore, a third valve, a fourth valve, a fifth valve, and a sixth valve are respectively arranged on the connecting pipes between the heat user heater, the medium-deep geothermal heat pump unit, the shallow soil source heat pump unit, the solar heating water storage tank and the water collector; a seventh valve, an eighth valve, a ninth valve, and a twelfth valve are respectively arranged on the connecting pipes between the medium-deep geothermal heat pump unit, the shallow soil source heat pump unit, the solar heating water storage tank, the heat user heater and the water distributor; a thirteenth valve and a fourteenth valve are respectively arranged on the water supply pipes of the medium-deep heat source side circulation pipe and the water supply pipes of the shallow heat source side circulation pipe.

[0015] Furthermore, a user-side heating circulation pump is arranged on the water supply pipe between the third valve and the heat user heater, a medium-deep rock heat source circulation pump is arranged on the water supply pipe of the medium-deep heat source side circulation pipeline between the thirteenth valve and the medium-deep rock heat heat pump unit, a shallow soil source circulation pump is arranged on the water supply pipe of the shallow heat source side circulation pipeline between the fourteenth valve and the shallow soil source heat pump unit, and a solar heat collection circulation pump is arranged on the water supply pipe of the solar heat circulation pipeline between the solar collector and the solar heat storage tank.

[0016] Furthermore, the water collector is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage water supply pipe, and the connection point of the first heat storage water supply pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve and the shallow soil source circulation pump; the water distributor is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage return pipe, and the connection point of the first heat storage return pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve and the shallow soil buried pipe; the first valve is arranged at the water inlet end of the first heat storage water supply pipe, the fifteenth valve is arranged at the water outlet end of the first heat storage water supply pipe, and the eleventh valve is arranged on the first heat storage return pipe.

[0017] Furthermore, the water collector is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through a second heat storage water supply pipe, and the connection point of the second heat storage water supply pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve and the medium-deep rock heat source circulation pump; the water distributor is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through a second heat storage return pipe, and the connection point of the second heat storage return pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve and the medium-deep rock heat coaxial sleeve heat exchanger; a second valve is arranged at the water inlet end of the second heat storage water supply pipe, a sixteenth valve is arranged at the water outlet end of the second heat storage water supply pipe, and a tenth valve is arranged on the second heat storage return pipe.

[0018] Beneficial technical effects of the utility model:

[0019] 1. The solar energy and medium-deep and shallow geothermal energy coupled heating and heat storage system of the utility model can not only realize the winter heating function of multi-energy complementary coupling of solar energy, medium-deep geothermal energy and shallow geothermal energy, but also store solar energy heat in shallow soil and medium-deep rock and soil to realize summer heat storage function.

[0020] 2. The utility model couples the heating unit with the medium-deep geothermal energy heating unit and the shallow geothermal energy heating unit for heating, which can effectively reduce the initial investment of the coupled heating system, reduce the area occupied by shallow geothermal energy, and improve the reliability of the system and resource utilization.

[0021] 3. The utility model can store solar energy heat in shallow soil and medium-deep rock and soil, effectively alleviate the uneven hot and cold phenomenon of shallow soil geothermal energy, extend its service life, increase the water outlet temperature during the medium-deep rock heat heating period, and further improve resource utilization and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a solar energy and medium-deep and shallow geothermal energy coupled heat supply and heat storage system of the utility model;

[0023] Figure markings: 1-medium and deep rock heat coaxial sleeve heat exchanger, 2-medium and deep rock heat heat pump unit, 3-shallow soil buried pipe, 4-shallow soil source heat pump unit, 5-solar collector, 6-solar heating water storage tank, 7-water collector, 8-water distributor, 9-heat user heater, 10-first valve, 11-second valve, 12-third valve, 13-fourth valve, 14-fifth valve, 15-sixth valve, 16-seventh valve, 17-eighth valve, 18-ninth valve, 19-tenth valve, 20-eleventh valve, 21-twelfth valve, 22-thirteenth valve, 23-fourteenth valve, 24-fifteenth valve, 25-sixteenth valve, 26-medium and deep rock heat source circulation pump, 27-shallow soil source circulation pump, 28-user side heating circulation pump, 29-solar heat collector circulation pump. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1

[0026] Please see attached Figure 1 As shown, a solar energy coupled with medium-deep and shallow geothermal energy heat supply and storage system comprises:

[0027] A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy, the medium-deep geothermal energy heating unit comprising a medium-deep geothermal coaxial shell-and-tube heat exchanger 1 and a medium-deep geothermal heat pump unit 2 connected by a medium-deep heat source side circulation pipeline loop;

[0028] A shallow geothermal energy heating unit for extracting shallow soil geothermal energy, the shallow geothermal energy heating unit comprising a shallow soil buried pipe 3 and a shallow soil source heat pump unit 4 connected by a shallow heat source side circulation pipeline loop;

[0029] A solar heating unit for converting solar energy into thermal energy, the solar heating unit comprising a solar collector 5 and a solar heating water storage tank 6 connected by a solar circulation pipeline loop;

[0030] A water collection and diversion unit for collecting and diverting waterways, the water collection and diversion unit comprising a water collector 7 and a water diverter 8;

[0031] A heat user unit, including a heat user heater 9;

[0032] The water inlet side of the water collector 7 is respectively connected to the solar heating water storage tank 6, the medium-deep rock heat heat pump unit 2, and the shallow soil source heat pump unit 4, and the water outlet side of the water collector 7 is respectively connected to the heat user heater 9, the water supply pipe of the medium-deep heat source side circulation pipeline, and the water supply pipe of the shallow heat source side circulation pipeline;

[0033] The water inlet side of the water divider 8 is connected to the heat user heater 9, and the water outlet side of the water divider 8 is respectively connected to the solar heating water storage tank 6, the medium-deep rock heat heat pump unit 2, and the shallow soil source heat pump unit 4.

[0034] Specifically, a third valve 12, a fourth valve 13, a fifth valve 14, and a sixth valve 15 are respectively arranged on the connecting pipelines between the heat user heater 9, the medium-deep geothermal heat pump unit 2, the shallow soil source heat pump unit 4, the solar heating water storage tank 6 and the water collector 7; a seventh valve 16, an eighth valve 17, a ninth valve 18, and a twelfth valve 21 are respectively arranged on the connecting pipelines between the medium-deep geothermal heat pump unit 2, the shallow soil source heat pump unit 4, the solar heating water storage tank 6, the heat user heater 9 and the water distributor 8; a thirteenth valve 22 and a fourteenth valve 23 are respectively arranged on the water supply pipes of the medium-deep heat source side circulation pipeline and the water supply pipes of the shallow heat source side circulation pipeline.

[0035] Specifically, a user-side heating circulation pump 28 is arranged on the water supply pipe between the third valve 12 and the heat user heater 9, a medium-deep rock heat source circulation pump 26 is arranged on the medium-deep heat source side circulation pipeline water supply pipe between the thirteenth valve 22 and the medium-deep rock heat heat pump unit 2, a shallow soil source circulation pump 27 is arranged on the shallow heat source side circulation pipeline water supply pipe between the fourteenth valve 23 and the shallow soil source heat pump unit 4, and a solar heat collection circulation pump 29 is arranged on the solar heat circulation pipeline water supply pipe between the solar collector 5 and the solar heat storage tank 6.

[0036] When the solar energy and medium-deep and shallow geothermal energy coupling heating and storage system of this embodiment is used for winter heating: the user-side heating circulation pump 28 is turned on, and the third valve 12, the fourth valve 13, the fifth valve 14, the sixth valve 15, the seventh valve 16, the eighth valve 17, the ninth valve 18, the twelfth valve 21, the thirteenth valve 22, and the fourteenth valve 23 are turned on; at this time, the shallow soil source circulation pump 27 and the medium-deep rock heat source circulation pump 26 are turned on, and geothermal energy is extracted through the shallow soil buried pipe 3 and the medium-deep rock heat coaxial sleeve heat exchanger 1. The low-grade geothermal energy is upgraded in grade (temperature) by the shallow soil source circulation pump 27 and the medium-deep rock heat source circulation pump 26, and the water enters the collector, and after the pressure is balanced and the temperature is adjusted by the water collector 7, heat is supplied to the heat user heater 9.

[0037] Example 2

[0038] On the basis of Example 1, the water collector 7 is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage water supply pipe, and the connection point of the first heat storage water supply pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve 23 and the shallow soil source circulation pump 27; the water distributor 8 is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage return pipe, and the connection point of the first heat storage return pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve 23 and the shallow soil buried pipe 3; the first valve 10 is set at the water inlet end of the first heat storage water supply pipe, the fifteenth valve 24 is set at the water outlet end of the first heat storage water supply pipe, and the eleventh valve 20 is set on the first heat storage return pipe. The water collector 7 is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through the second heat storage water supply pipe, and the connection point of the second heat storage water supply pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve 22 and the medium-deep rock heat source circulation pump 26; the water distributor 8 is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through the second heat storage return pipe, and the connection point of the second heat storage return pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve 22 and the medium-deep rock heat coaxial sleeve heat exchanger 1; a second valve 11 is arranged at the water inlet end of the second heat storage water supply pipe, a sixteenth valve 25 is arranged at the water outlet end of the second heat storage water supply pipe, and a tenth valve 19 is arranged on the second heat storage return pipe.

[0039] When the solar energy coupled heating and heat storage system of the present embodiment is used for winter heating: the user-side heating circulation pump 28 is turned on, the third valve 12, the fourth valve 13, the fifth valve 14, the sixth valve 15, the seventh valve 16, the eighth valve 17, the ninth valve 18, the twelfth valve 21, the thirteenth valve 22, and the fourteenth valve 23 are turned on, and the first valve 10, the second valve 11, the tenth valve 19, the eleventh valve 20, the fifteenth valve 24, and the sixteenth valve 25 are closed; at this time, the shallow soil source circulation pump 27 and the medium-deep rock heat source circulation pump 26 are turned on, and geothermal energy is extracted through the shallow soil buried pipe 3 and the medium-deep rock heat coaxial sleeve heat exchanger 1. The low-grade geothermal energy is upgraded in grade (temperature) by the shallow soil source circulation pump 27 and the medium-deep rock heat source circulation pump 26, and the water enters the collector, and after the pressure is balanced and the temperature is adjusted by the water collector 7, heat is supplied to the heat user heater 9.

[0040] When the solar energy and medium-deep and shallow geothermal energy coupling heating and storage system of this embodiment are used for summer heat storage: the solar collector 5 heats the water in the solar heating water storage tank 6 to high-temperature water with a temperature range of 50-70°C. At this time, the user-side heating circulation pump 28 is closed, the first valve 10, the second valve 11, the sixth valve 15, the ninth valve 18, the tenth valve 19, the eleventh valve 20, the fifteenth valve 24, and the sixteenth valve 25 are opened, the third valve 12, the fourth valve 13, the fifth valve 14, the seventh valve 16, the eighth valve 17, the twelfth valve 21, the thirteenth valve 22, and the fourteenth valve 23 are closed, and the shallow soil source circulation pump 27 and the medium-deep rock heat source circulation pump 26 are opened. The hot water in the solar energy solar heating water storage tank 6 enters the shallow soil buried pipe 3 and the medium-deep rock heat coaxial sleeve heat exchanger 1 through the water collector 7 for circulation, so as to store the solar energy heat in the shallow soil and the medium-deep rock mass, and realize the heat storage function.

[0041] The above is a preferred embodiment of the utility model, which is used to explain the technical solution of the utility model. Those skilled in the art can also make conventional modifications, equivalent substitutions and improvements within the spirit and principle of the utility model. Various modifications to these embodiments will be obvious to professionals in the field, and can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein.

Claims

1. A solar energy coupled with medium-deep and shallow geothermal energy heat supply and storage system, characterized in that: include: A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy, the medium-deep geothermal energy heating unit comprising a medium-deep geothermal coaxial shell-and-tube heat exchanger and a medium-deep geothermal heat pump unit connected by a medium-deep heat source side circulation pipeline loop; A shallow geothermal energy heating unit for extracting shallow soil geothermal energy, the shallow geothermal energy heating unit comprising a shallow soil buried pipe and a shallow soil source heat pump unit connected by a shallow heat source side circulation pipeline loop; A solar heating unit for converting solar energy into thermal energy, the solar heating unit comprising a solar collector and a solar heating water storage tank connected by a solar circulation pipeline loop; A water collection and diversion unit for collecting and diverting waterways, the water collection and diversion unit comprising a water collector and a water diverter; heat user units, including heat user heaters; The water inlet side of the water collector is respectively connected to the solar heating water storage tank, the medium-deep rock heat heat pump unit, and the shallow soil source heat pump unit, and the water outlet side of the water collector is respectively connected to the heat user heater, the water supply pipe of the medium-deep heat source side circulation pipeline, and the water supply pipe of the shallow heat source side circulation pipeline; The water inlet side of the water distributor is connected to the heat user heater, and the water outlet side of the water distributor is respectively connected to the solar heating water storage tank, the medium-deep rock heat heat pump unit, and the shallow soil source heat pump unit.

2. The solar energy coupled heat supply and heat storage system according to claim 1 is characterized by: The third valve, the fourth valve, the fifth valve and the sixth valve are respectively arranged on the connecting pipelines between the heat user heater, the medium-deep rock heat heat pump unit, the shallow soil source heat pump unit, the solar heating water storage tank and the water collector; the seventh valve, the eighth valve, the ninth valve and the twelfth valve are respectively arranged on the connecting pipelines between the medium-deep rock heat heat pump unit, the shallow soil source heat pump unit, the solar heating water storage tank, the heat user heater and the water distributor; the thirteenth valve and the fourteenth valve are respectively arranged on the water supply pipes of the medium-deep heat source side circulation pipeline and the water supply pipes of the shallow heat source side circulation pipeline.

3. The solar energy coupled heat supply and heat storage system according to claim 2 is characterized by: A user-side heating circulation pump is installed on the water supply pipe between the third valve and the heat user's heater, a medium-deep rock heat source circulation pump is installed on the water supply pipe of the medium-deep heat source side circulation pipeline between the thirteenth valve and the medium-deep rock heat heat pump unit, a shallow soil source circulation pump is installed on the water supply pipe of the shallow heat source side circulation pipeline between the fourteenth valve and the shallow soil source heat pump unit, and a solar heat collection circulation pump is installed on the water supply pipe of the solar heat circulation pipeline between the solar collector and the solar heat storage tank.

4. The solar energy coupled heat supply and heat storage system according to claim 3 is characterized by: The water collector is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage water supply pipe, and the connection point of the first heat storage water supply pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve and the shallow soil source circulation pump; the water distributor is connected to the water supply pipe of the shallow heat source side circulation pipeline through the first heat storage return pipe, and the connection point of the first heat storage return pipe on the shallow heat source side circulation pipeline water supply pipe is located between the fourteenth valve and the shallow soil buried pipe; the first valve is arranged at the water inlet end of the first heat storage water supply pipe, the fifteenth valve is arranged at the water outlet end of the first heat storage water supply pipe, and the eleventh valve is arranged on the first heat storage return pipe.

5. The solar energy coupled heat supply and heat storage system according to claim 4 is characterized by: The water collector is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through the second heat storage water supply pipe, and the connection point of the second heat storage water supply pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve and the medium-deep rock heat source circulation pump; the water distributor is connected to the water supply pipe of the circulating pipeline on the medium-deep heat source side through the second heat storage return pipe, and the connection point of the second heat storage return pipe on the water supply pipe of the circulating pipeline on the medium-deep heat source side is located between the thirteenth valve and the medium-deep rock heat coaxial sleeve heat exchanger; a second valve is arranged at the water inlet end of the second heat storage water supply pipe, a sixteenth valve is arranged at the water outlet end of the second heat storage water supply pipe, and a tenth valve is arranged on the second heat storage return pipe.

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