阅读说明：本技术 一种中深层地热能降压开采系统 (Medium-deep geothermal energy decompression mining system ) 是由 张春奇 底梦茹 张辉 于 2021-09-27 设计创作，主要内容包括：本发明提供了一种中深层地热能降压开采系统,属于地源热泵系统技术领域,包括地热井、板式换热器、地源热泵机组及动力机构,地热井包括换热段和蒸发段；板式换热器入口与地热井出口连通,用于与换热介质进行热量交换；地源热泵机组入口与板式换热器出口连通,用于与从板式换热器出口排出的换热介质进行热量交换；地热井和地源热泵机组之间设有动力机构。本发明一种中深层地热能降压开采系统通过设置动力机构为整个系统提供真空,使换热介质在地热井中的低温低压条件下蒸发,蒸发后以液体形态通过板式换热器进行换热,换热介质的余热可通过地源热泵机组进一步换热供后回流回地热井,节能环保,运行可靠成本低,换热效率高。(The invention provides a medium-deep geothermal energy depressurization exploitation system, which belongs to the technical field of ground source heat pump systems and comprises a geothermal well, a plate heat exchanger, a ground source heat pump unit and a power mechanism, wherein the geothermal well comprises a heat exchange section and an evaporation section; the inlet of the plate heat exchanger is communicated with the outlet of the geothermal well and is used for exchanging heat with a heat exchange medium; the inlet of the ground source heat pump unit is communicated with the outlet of the plate heat exchanger and is used for exchanging heat with a heat exchange medium discharged from the outlet of the plate heat exchanger; a power mechanism is arranged between the geothermal well and the ground source heat pump unit. According to the medium-deep geothermal energy depressurization exploitation system, the power mechanism is arranged to provide vacuum for the whole system, so that a heat exchange medium is evaporated under the condition of low temperature and low pressure in the geothermal well, heat exchange is carried out through the plate heat exchanger in a liquid form after evaporation, and waste heat of the heat exchange medium can be further subjected to heat exchange by the ground source heat pump unit and then flows back to the geothermal well, so that the system is energy-saving and environment-friendly, reliable in operation, low in cost and high in heat exchange efficiency.)

1. A middle-deep geothermal energy decompression mining system is characterized by comprising:

the geothermal well is arranged below the ground and comprises a heat exchange section positioned at the lower part and an evaporation section positioned at the upper part, and the diameter of a well pipe of the evaporation section is larger than that of the heat exchange section;

the inlet of the plate heat exchanger is communicated with the outlet of the geothermal well and is used for exchanging heat with a heat exchange medium of the geothermal well; the outlet of the plate heat exchanger is used for being communicated with user equipment;

an inlet of the ground source heat pump unit is communicated with an outlet of the plate heat exchanger and is used for exchanging heat with a heat exchange medium discharged from the outlet of the plate heat exchanger; the outlet of the ground source heat pump unit is used for being communicated with the user equipment; and

the power mechanism is connected between the geothermal well and the ground source heat pump unit;

the power mechanism is used for enabling a heat exchange medium flowing through the geothermal well to flow to the plate heat exchanger, the ground source heat pump unit and the user equipment and then to flow back to the geothermal well, and the power mechanism provides vacuum for the medium-deep geothermal energy pressure reduction exploitation system.

2. The system of claim 1, wherein the power mechanism comprises a vacuum pump and a vacuum chamber in communication with the vacuum pump, and the vacuum chamber is disposed between the ground source heat pump unit and the geothermal well.

3. A medium and deep geothermal energy depressurization production system according to claim 1 wherein a storage tank is provided between the geothermal well and the plate heat exchanger.

4. The system of claim 1, wherein an automatic fluid infusion device is disposed between the ground source heat pump unit and the geothermal well, the automatic fluid infusion device comprises a fluid infusion tank communicated with the vacuum chamber, and the fluid infusion tank is communicated with the vacuum chamber through a fluid infusion tube.

5. The system of claim 1, wherein the power mechanism further comprises a water pump, and the water pump is disposed at a lower portion of the vacuum chamber.

6. The system of claim 1, wherein the connecting pipe is provided with a filter.

7. The system for the reduced pressure exploitation of geothermal energy at the middle and deep layers according to claim 1, wherein the geothermal well, the plate heat exchanger, the ground source heat pump unit and the power mechanism are in circulating communication through connecting pipes; the user equipment is communicated with the plate heat exchanger and the ground source heat pump unit through connecting pipes.

8. The medium-deep geothermal energy pressure-reducing exploitation system of claim 1, wherein the depth of the geothermal well is 1000-2000 m.

9. The system of claim 1, wherein a first thermometer is disposed on the connecting pipe at the inlet of the geothermal well, and a second thermometer is disposed on the connecting pipe at the outlet of the geothermal well.

10. The system of claim 1, wherein the heat exchange medium is water, coolant, or other liquid heat transfer medium.

Technical Field

The invention belongs to the technical field of ground source heat pump systems, and particularly relates to a pressure reduction mining system for middle-deep geothermal energy.

Background

Geothermal Energy (Geothermal Energy) is natural heat Energy extracted from the earth's crust, which comes from lava rock inside the earth and exists in the form of heat, which is Energy that causes volcanic eruptions and earthquakes. The temperature inside the earth is as high as 7000 c, and at depths of 80 to 100 miles, the temperature drops to 650 to 1200 c. Through the flow of groundwater and the gushing of lava to the crust 1 to 5 km from the ground, the heat is transferred closer to the ground. The hot lava heats up the nearby ground water, which eventually seeps out of the ground. The simplest and most cost-effective way to use geothermal energy is to take these sources directly and extract their energy.

The geothermal system is a heating and refrigerating system which uses the energy stored in underground water or underground soil as cold and heat sources and uses a ground source heat pump to convert the energy, and the geothermal system is a technology which uses clean renewable energy sources, and has no combustion, no smoke discharge and no waste. The earth surface soil and the water body are huge solar heat collectors which collect 47% of solar radiation energy and are huge dynamic energy balance systems, the earth surface soil and the water body naturally keep the relative balance of energy receiving and dispersing, the success of the ground source heat pump technology realizes the utilization of almost infinite solar energy or geothermal energy stored in the earth surface soil and the water body, the earth surface soil and the water body consume 1kWh of energy, and users can obtain heat or cold more than 4 kWh. At present, the existing ground source heat pump has more shallow geothermal wells, large occupied area, fussy construction, slower construction speed, unbalanced cold and hot loads in winter and summer, unbalanced temperature during heating or refrigeration, insufficient indoor comfort and serious system energy efficiency attenuation.

Disclosure of Invention

The invention aims to provide a medium-deep geothermal energy pressure-reducing mining system, and aims to solve the technical problems that the existing shallow geothermal wells are large in quantity and large in occupied area, cold and hot loads in winter and summer are unbalanced, and the energy efficiency of the system is seriously attenuated.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a medium-deep geothermal energy decompression mining system, comprising:

the geothermal well is arranged below the ground and comprises a heat exchange section positioned at the lower part and an evaporation section positioned at the upper part, and the diameter of a well pipe of the evaporation section is larger than that of the heat exchange section;

the inlet of the plate heat exchanger is communicated with the outlet of the geothermal well and is used for exchanging heat with a heat exchange medium of the geothermal well; the outlet of the plate heat exchanger is communicated with user equipment;

an inlet of the ground source heat pump unit is communicated with an outlet of the plate heat exchanger and is used for exchanging heat with a heat exchange medium discharged from the outlet of the plate heat exchanger; the outlet of the ground source heat pump unit is communicated with the user equipment;

the power mechanism is connected between the geothermal well and the ground source heat pump unit;

the power mechanism is used for enabling a heat exchange medium flowing through the geothermal well to flow to the plate heat exchanger, the ground source heat pump unit and the user equipment and then to flow back to the geothermal well, and the power mechanism provides vacuum for the medium-deep geothermal energy pressure reduction exploitation system.

As another embodiment of the present application, the power mechanism includes a vacuum pump and a vacuum chamber communicated with the vacuum pump, and the vacuum chamber is disposed between the ground source heat pump unit and the geothermal well.

As another embodiment of the application, a water storage tank is arranged between the geothermal well and the plate heat exchanger.

As another embodiment of the application, an automatic liquid supplementing device is arranged between the ground source heat pump unit and the geothermal well, the automatic liquid supplementing device comprises a liquid supplementing box communicated with the vacuum chamber, and the liquid supplementing box is communicated with the vacuum chamber through a liquid supplementing pipe.

As another embodiment of the present application, the power mechanism further includes a water pump, and the water pump is disposed at a lower portion of the vacuum chamber.

As another embodiment of the present application, a filter is disposed on the connection pipe.

As another embodiment of the present application, the geothermal well, the plate heat exchanger, the ground source heat pump unit and the power mechanism are circularly communicated through connecting pipes; the user equipment is communicated with the plate heat exchanger and the ground source heat pump unit through connecting pipes.

As another embodiment of the present application, the depth of the geothermal well is 1000-2000 m.

As another embodiment of this application, be equipped with first thermometer on the connecting pipe of geothermal well entrance, be equipped with the second thermometer on the connecting pipe of geothermal well exit.

As another embodiment of the present application, the heat exchange medium is water, cooling liquid, or other liquid heat transfer medium.

The medium-deep geothermal energy decompression mining system provided by the invention has the beneficial effects that: compared with the prior art, the medium-deep geothermal energy depressurization exploitation system provided by the invention has the advantages that the power mechanism is arranged to provide vacuum for the whole system, so that a heat exchange medium is evaporated under the condition of low temperature and low pressure in the geothermal well, the heat exchange is carried out in a liquid form through the plate heat exchanger after the evaporation, and the waste heat of the heat exchange medium can be further subjected to heat exchange through the ground source heat pump unit and then flows back to the geothermal well.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a medium-deep geothermal energy depressurization mining system according to an embodiment of the present invention;

in the figure: 100. a geothermal well; 110. a heat exchange section; 111. a catheter; 120. an evaporation section; 200. a water storage tank; 300. a plate heat exchanger; 400. a ground source heat pump unit; 500. a vacuum chamber; 510. a vacuum pump; 520. a water pump; 530. a liquid replenishing box; 600. a filter; 700. a connecting pipe; 800. a first thermometer; 900. a second thermometer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a medium and deep geothermal energy pressure-reducing mining system according to the present invention will now be described. The medium-deep geothermal energy depressurization mining system comprises a geothermal well 100, a plate heat exchanger 300, a ground source heat pump unit 400 and a power mechanism; the geothermal well 100 is arranged below the ground, the geothermal well 100 comprises a heat exchange section 110 at the lower part and an evaporation section 120 at the upper part, and the diameter of a well pipe of the evaporation section 120 is larger than that of the heat exchange section 110; the inlet of the plate heat exchanger 300 is communicated with the outlet of the geothermal well 100 and is used for exchanging heat with the heat exchange medium of the geothermal well 100; the outlet of the plate heat exchanger 300 is communicated with user equipment; an inlet of the ground source heat pump unit 400 is communicated with an outlet of the plate heat exchanger 300 and is used for exchanging heat with a heat exchange medium discharged from an outlet of the plate heat exchanger 300; the outlet of the ground source heat pump unit 400 is communicated with the user equipment; a power mechanism which enables a heat exchange medium flowing through the geothermal well 100 to flow to the plate heat exchanger 300, the geothermal well unit 400 and the user equipment, flow back to the geothermal well 100 and provide vacuum for the whole system is arranged between the geothermal well 100 and the geothermal source heat pump unit 400.

Before the system operates, the whole system is filled with a heat exchange medium, then a power mechanism is started to enable the heat exchange medium to start circulation, the heat exchange medium flows downwards in a heat exchange section 110 to gradually absorb the ground heat in the middle-deep layer and is conveyed upwards from a liquid guide pipe 111 in the heat exchange section 110, the power mechanism provides vacuum for the system, the heat exchange medium evaporates from a liquid state to a gas state from a shallow layer under the vacuum low-pressure condition of an evaporation section 120, the power mechanism continues to discharge liquid to provide vacuum in the evaporation process of the heat exchange medium, the more the liquid is discharged, the more the evaporation of the heat exchange medium is closer to the lower part, the more the space required by evaporation is larger, the more the dynamic circulation is faster the lower the liquid is, the heat exchange medium flows out in a liquid state at the opening of a geothermal well 100 and enters a plate heat exchanger 300 for heat exchange, water at one end of user equipment can be used for heating after exchanging heat with the heat exchange medium through the plate heat exchanger 300, and waste heat of the heat exchange medium flowing out from the plate heat exchanger 300 is continued to exchange with water at one end of the user equipment through a ground source heat pump unit 400 Can be used as domestic water after being heated. The heat exchange medium continuously absorbs heat in the heat exchange section 110, evaporates in the evaporation section 120, exchanges heat in a liquid state, and then flows back to the geothermal well 100 to form a cycle.

The medium-deep geothermal energy decompression mining system provided by the invention has the beneficial effects that: compared with the prior art, the medium-deep geothermal energy depressurization exploitation system provided by the invention is provided with the power mechanism to provide vacuum for the whole system, so that a heat exchange medium is evaporated under the low-temperature and low-pressure condition in the geothermal well 100, the heat exchange is carried out in a liquid form through the plate heat exchanger 300 after the evaporation, and the waste heat of the heat exchange medium can be further subjected to heat exchange through the ground source heat pump unit 400 and then flows back to the geothermal well 100.

As a specific embodiment of the medium-deep geothermal energy depressurization mining system provided by the present invention, referring to fig. 1, the power mechanism includes a vacuum pump 510 and a vacuum chamber 500 communicated with the vacuum pump 510, and the vacuum chamber 500 is disposed between the ground source heat pump unit 400 and the geothermal well 100.

In this embodiment, the vacuum pump 510 provides vacuum, and the vacuum pump 510 is automatically controlled to maintain a set vacuum degree of the system, so as to achieve vacuum balance.

Referring to fig. 1, as a specific embodiment of the system for extracting geothermal energy from a medium-deep layer by pressure reduction, a water storage tank 200 is disposed between the geothermal well 100 and the plate heat exchanger 300.

In this embodiment, the water storage tank 200 may store the heat exchange medium flowing out of the geothermal well 100.

Referring to fig. 1, an automatic fluid infusion device is disposed between the ground source heat pump unit 400 and the geothermal well 100, the automatic fluid infusion device includes a fluid infusion tank 530 communicated with the vacuum chamber 500, and the fluid infusion tank 530 is communicated with the vacuum chamber 500 through a fluid infusion pipe.

In this embodiment, an automatic fluid infusion device is disposed between the ground source heat pump and the geothermal well 100, so as to ensure vacuum balance of the system, and if the heat exchange medium in the system is too little, the system is infused with fluid through the automatic fluid infusion device or the water pump 520 via the heat exchange medium stored in the fluid infusion tank 530.

Referring to fig. 1, the power mechanism further includes a water pump 520, and the water pump 520 is disposed at a lower portion of the vacuum chamber 500.

In this embodiment, before the system operation, heat transfer medium is injected for the first time, make entire system be full of heat transfer medium, the efficiency that vacuum pump 510 absorbs the vacuum is far away not as efficient as water pump 520, start water pump 520 flowing back, form the vacuum at once, heat transfer medium begins the evaporation promptly, heat transfer medium after the evaporation condenses into water after the heat transfer, in the geothermal well 100 of continuous backward flow, when heat transfer medium is not enough, water pump 520 takes heat transfer medium back, when the system vacuum degree is not enough, vacuum pump 510 starts the evacuation, reach the balanced purpose of evaporation.

Referring to fig. 1, as a specific embodiment of the system for mining geothermal energy at a medium and deep layer with reduced pressure, a filter 600 is disposed on the connecting pipe 700.

In this embodiment, the filter 600 intercepts mechanical substances such as impurities, suspended matters, particles and the like in the heat exchange medium through the filter screen, adsorbs and intercepts viscous substances such as turbidity, colloid substances, dirt, bacteria, algae, rust and the like in the heat exchange medium through the activated filter material, decomposes the dirt on the inner wall of the geothermal connection pipe 700, prevents the geothermal connection pipe 700 from being blocked, plays a role in cleaning the geothermal connection pipe 700, slowly releases chemical substances with interference capability through the activated filter material to remove the viscosity of the geothermal water scale, and can also make old water scale adhered on the pipe wall surface of the geothermal connection pipe 700 dissolve and peel off layer by layer; the filter 600 may be disposed at the outlet or inlet of the geothermal well 100.

As a specific embodiment of the medium-deep geothermal energy depressurization mining system provided by the present invention, referring to fig. 1, the geothermal well 100, the plate heat exchanger 300, the ground source heat pump unit 400, and the power mechanism are in circulating communication through a connecting pipe 700; the user equipment is communicated with the plate heat exchanger 300 and the ground source heat pump unit 400 through a connecting pipe 700.

Referring to fig. 1, as a specific embodiment of the medium-deep geothermal energy depressurization mining system provided by the present invention, the depth of the geothermal well 100 is 1000-2000 m.

In this implementation, the thermal energy of the mid-depth formation is from the earth's overhanging renewable thermal energy due to the decay of the earth's molten magma and radioactive materials; the water-saving energy-saving device mainly comprises i-position integrated valuable natural resources of heat, mine and water dug out from the deep part of the earth crust, has the advantages of stability, continuity, high utilization efficiency and the like, and is clean and sustainable energy; the deep geothermal energy is renewable heat energy from the deep of the earth, the middle-deep geothermal energy comprises geothermal energy with the underground depth of 200-3000 m, and the temperature range is 25-150 ℃; the available range of the intermediate-deep geothermal energy is as follows: the power can be directly generated and comprehensively utilized at the temperature of 200-400 ℃; the heat exchanger is used for double-cycle power generation, refrigeration, industrial drying and industrial heat processing at 150-200 ℃; the product is used for double-cycle power generation, heating, refrigeration, industrial drying, dehydration processing and salt recovery at 100-150 ℃, and can food; heating at 50-100 ℃, heating in a greenhouse, domestic hot water and industrial drying; the fertilizer is used for bathing, aquaculture, livestock raising, soil heating and dehydration processing at the temperature of 20-50 ℃; the geothermal energy is used in a gradient manner according to the temperature of the actually taken hot water, and different geothermal temperatures are selected to be applied to different scenes, namely the geothermal water is respectively corresponding to the requirements of users from high to low according to the heating water temperature required by the users; the depth of the geothermal well 100 of the medium-deep geothermal energy pressure-reducing exploitation system is 1000-2000 m, the corresponding geothermal temperature is not higher than 100 ℃, and the system can be used for heating, greenhouses, household hot water and the like.

Referring to fig. 1, as a specific embodiment of the medium-deep geothermal energy depressurization mining system provided by the present invention, a first thermometer 800 is disposed on a connecting pipe 700 at an inlet of the geothermal well 100, and a second thermometer 900 is disposed on the connecting pipe 700 at an outlet of the geothermal well 100.

In this embodiment, the first thermometer 800 may measure the temperature of the heat exchange medium flowing out of the geothermal well 100, and the second thermometer 900 may measure the temperature of the heat exchange medium flowing back into the geothermal well 100.

Referring to fig. 1, as a specific embodiment of the system for mining geothermal energy at a medium and deep layer under reduced pressure provided by the present invention, the heat exchange medium is water, cooling liquid or other liquid heat-conducting medium.

In this embodiment, the heat exchange medium used in the present invention is water, coolant or other heat exchange media, and other auxiliary media may be added to the heat exchange medium to protect the pipe from being corroded by the heat exchange medium, so as to prolong the service life of the connection pipe 700.

It should be noted that the medium-deep geothermal energy pressure-reducing mining system can supply heat and domestic water, can be widely applied to buildings such as hotels, shopping malls, office buildings, schools and the like, and is more suitable for heating of commodity buildings, houses and villas.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.