Shallow geothermal energy single well full recharge ground source heat pump energy-saving system

Abstract

The utility model discloses a shallow geothermal energy single-well full-recharge ground source heat pump energy-saving system which is characterized in that a draining layer and a bushing well are arranged in a well wall from outside to inside, and a plurality of holes are formed in the bushing well; a water taking pipe is fixed in the bushing well through a plurality of supporting rings, the bottom end of the water taking pipe extends into the precipitation pipe, and a submersible pump is arranged at the bottom end of the water taking pipe; a high-position recharge pipe and a low-position recharge pipe are respectively arranged at different heights in the draining layer; seepage holes are respectively formed in the pipe walls of the high-position recharge pipe and the low-position recharge pipe; by means of the structural arrangement, heat exchange between recharge water and a shallow soil layer with high-level energy can be improved to the maximum extent so as to obtain heat of a higher energy level, the operation efficiency of a ground source heat pump unit is improved, meanwhile, the purposes of energy conservation, high efficiency and water conservation are achieved, and improvement of the prior art is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive utilization of renewable energy, in particular to a shallow geothermal energy single well full reinjection ground source heat pump energy-saving system. Background Art

[0002] In recent years, with the continuous deepening of the development and utilization of new energy projects by the country, geothermal energy has been widely used as a cold and heat source or auxiliary energy for building heating and air-conditioning systems. Water extraction and heat exchange geothermal wells include medium-deep geothermal wells and shallow geothermal wells. The energy-saving system disclosed in the utility model is mainly used in shallow geothermal wells. Such shallow geothermal wells can be understood as geothermal wells within the depth range of 0 to 200m below the surface.

[0003] The above-mentioned geothermal well water treatment system is divided into a water intake treatment system and a tail water reinjection treatment system. At present, the geothermal well water treatment on the market mainly includes one-pump-multiple-return open-type collection well water reinjection or closed-type collection well water reinjection, single-well closed-type full reinjection and other treatment forms. However, due to various reasons such as reinjection technology and market supervision, the tail water cannot be reinjected or reinjected in the same layer. In this field, even direct discharge is used. Long-term use of the above methods will cause water waste, groundwater level decline, site collapse, groundwater pollution and other problems.

[0004] In view of the actual drawbacks of the existing technology, the technical problem that needs to be solved at present is: how to design a single-well full-recharge ground source heat pump energy-saving system with simple structure, high efficiency and water saving, which can realize the effective recharge of groundwater through a multi-stage recharge system, avoid water waste and extract water energy to the greatest extent. Utility Model Content

[0005] In order to address the deficiencies in the prior art, the purpose of the utility model is to provide a shallow geothermal energy single-well full-recharge ground source heat pump energy-saving system, which, by setting a liner well and controlling a regulating valve, controls the switch to maximize the heat exchange between the recharged water and the shallow soil layer with a higher level of energy, so as to obtain heat of a higher energy level, improve the operating efficiency of the ground source heat pump unit, and achieve the goals of energy saving, high efficiency, and water saving.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical scheme: a shallow geothermal energy single well full reinjection ground source heat pump energy-saving system, including a well wall, a drainage layer is arranged inside the well wall, the inner side of the drainage layer is a liner well, and the liner well is provided with a plurality of eyelets; the bottom end of the liner well is a sedimentation pipe;

[0007] A plurality of support rings are arranged inside the bushing well, and a water intake pipe is fixed by the support rings. The bottom end of the water intake pipe extends into the sedimentation pipe and a submersible pump is arranged at the bottom end of the water intake pipe. A plurality of reinjection pipes are arranged inside the drainage layer and each reinjection pipe is provided with a switch. The reinjection pipes are divided into high-position reinjection pipes and low-position reinjection pipes, and the high-position reinjection pipes and the low-position reinjection pipes are arranged at different heights of the drainage layer. Seepage holes are arranged on the pipe walls of the high-position reinjection pipe and the low-position reinjection pipe respectively. The axial height of the seepage hole on the high-position reinjection pipe is higher than the axial height of the seepage hole on the low-position reinjection pipe.

[0008] The drainage layer is formed by stacking materials with good water filtering performance, such as cobblestone gravel, medium and large-size quartz sand and gravel, diatomaceous earth and mixtures thereof.

[0009] The bottom ends of the high-position reinjection pipe and the low-position reinjection pipe are both provided with conical flower tubes, and the outer walls of the conical flower tubes are provided with a plurality of seepage holes, the aperture of the seepage holes is 6-10mm, and the number of holes is determined according to the reinjection water volume and the well water level.

[0010] The bushing well is arranged in a cylindrical structure, and an upper flange is arranged on the top; the upper flange is arranged above the drainage layer, and the operating width at the bushing well port can be increased by arranging the upper flange; the bushing well is made of engineering plastic or steel pipe.

[0011] The well wall is a gray pipe well pipe, a steel pipe well pipe, or a cast iron well pipe.

[0012] The aperture of the flower holes on the bushing well is 8-12 mm, and the number of holes is determined according to the amount of reinjected water and the well water level.

[0013] A filter screen is arranged on the outer surface of the high-position reinjection pipe, the low-position reinjection pipe and the bushing well; the filter screen is used to filter and remove dirt particles such as sand and clay with a particle size of ≥1-2mm, prevent the eye or seepage hole from being blocked, and improve the filtering efficiency of the reinjection water.

[0014] The height of the sedimentation pipe is 0.5-2m, and its specific height is determined according to the amount of reinjection water, the material of the drainage layer and the water level of the well.

[0015] The beneficial effects of the utility model are as follows: the utility model is provided with a drainage layer and a liner well from the outside to the inside of the well wall, and a plurality of eyelets are provided on the liner well; a water intake pipe is fixed by a plurality of support rings inside the liner well, and the bottom end of the water intake pipe extends into the sedimentation pipe and a submersible pump is provided at the bottom end of the water intake pipe; a high-position reinjection pipe and a low-position reinjection pipe are respectively provided at different heights inside the drainage layer, and seepage holes are respectively provided on the pipe walls of the high-position reinjection pipe and the low-position reinjection pipe; through the above structural arrangement, the heat exchange between the reinjection water and the shallow soil layer with higher energy level can be maximized to obtain heat of higher energy level, thereby improving the operation efficiency of the ground source heat pump unit, and at the same time achieving the purposes of energy saving, high efficiency and water saving, thereby realizing the improvement of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0018] In the figure: 1, well wall, 2, conical flower pipe, 3, drainage layer, 4, high-level reinjection pipe, 5, bushing well, 6, upper flange, 7, regulating valve, 8, support ring, 9, water intake pipe, 10, through hole, 11, water level, 12, flower eye, 13, low-level reinjection pipe, 14, submersible pump, 15, sedimentation pipe, 16, seepage hole. DETAILED DESCRIPTION

[0019] The present invention is further described below through implementation modes. Those skilled in the art may refer to the implementation modes for implementation, and may also make technical improvements and innovations based on the technical foundation of the existing technical solutions.

[0020] As shown in the attached figure, a shallow geothermal energy single well full reinjection ground source heat pump energy-saving system includes a well wall 1, a conical flower pipe 2, a drainage layer 3, a high-position reinjection pipe 4, a liner well 5, a regulating valve 7, a support ring 8, a water intake pipe 9, a flower eye 12, a low-position reinjection pipe 13, a sedimentation pipe 15 and other auxiliary structural parts. The arrangement relationship of the above components is as follows: a drainage layer 3 is arranged inside the well wall 1, the inner side of the drainage layer 3 is a liner well 5, and the liner well 5 is provided with a plurality of flower eyes 12; the bottom end of the liner well is a sedimentation pipe 15;

[0021] A plurality of support rings 8 are arranged inside the bushing well 5, and the water intake pipe 9 is fixed by the support rings 8. The bottom end of the water intake pipe 9 extends into the sedimentation pipe 15 and a submersible pump 14 is arranged at the bottom end of the water intake pipe 9; a plurality of reinjection pipes are arranged inside the drainage layer 3 and each reinjection pipe is provided with a switch. The reinjection pipes are divided into a high-position reinjection pipe 4 and a low-position reinjection pipe 13. The high-position reinjection pipe 4 and the low-position reinjection pipe 13 are arranged at different heights of the drainage layer 3; seepage holes 16 are arranged on the pipe walls of the high-position reinjection pipe 4 and the low-position reinjection pipe 13 respectively.

[0022] The bushing well 5 is made of engineering plastics or steel pipe; the well wall 1 is made of gray pipe well pipe, steel pipe well pipe or cast iron well pipe.

[0023] The drainage layer 3 is formed by stacking cobblestones with good water filtering performance, quartz sand and gravel with medium and large particle sizes, diatomaceous earth and their mixtures, etc. The above materials are all non-water-absorbing materials.

[0024] A plurality of seepage holes 16 are provided on the walls of the high-position recharge pipe 4 and the low-position recharge pipe 13, and a conical flower tube 2 is provided at the bottom of both the high-position recharge pipe 4 and the low-position recharge pipe 13; the set number of the seepage holes 16 of the high-position recharge pipe 4 is consistent with the set number of the seepage holes 16 on the wall of the low-position recharge pipe 13, and the axial height size position of the seepage holes 16 on the high-position recharge pipe 4 is higher than the axial height position of the low-position recharge pipe 13. The aperture of the flower eye 12 is 8-12 mm, and the number of holes is determined according to the amount of reinjection water and the water level of the well; preferably, the aperture of the seepage holes 16 on the wall of the conical flower tube 2, the high-position reinjection pipe 4, and the low-position reinjection pipe 13 is preferably 6-10 mm, and the number of holes is determined according to the amount of reinjection water and the water level of the well; however, it should be noted that the aperture rate of the flower eye or seepage hole on the wall of the conical flower tube 2, the high-position reinjection pipe 4, the bushing well 5, and the low-position reinjection pipe 13 disclosed above is ≥50%.

[0025] The highest opening position of the seepage hole 16 of the high-level recharge pipe 4 is located in the drainage layer 3 below the boss of the bushing well 5; the highest opening position of the seepage hole 16 of the low-level recharge pipe 13 is located below the liquid surface of the highest water level 11 of the geothermal well water; the highest opening position of the eye 12 of the well wall of the bushing well 5 is located below the liquid surface of the highest water level 11 of the geothermal well water.

[0026] Preferably, the surfaces of the conical flower tube 2, the high-position reinjection pipe 4, the bushing well 5, and the low-position reinjection pipe 13 are preferably provided with a filter screen made of stainless steel or other anti-corrosion materials with openings or a wire mesh structure; the filter screen is provided for filtering and removing dirt particles such as sand and clay with a particle size of ≥1 to 2 mm, preventing the flower eyes 12 and the seepage holes 16 from being blocked, so as to improve the filtration efficiency of the reinjection water.

[0027] Preferably, the height of the sedimentation pipe 15 is preferably 0.5 to 2 m, and its specific height is determined according to the amount of reinjection water, the material of the drainage layer and the well water level.

[0028] The utility model switches the high-level reinjection pipe 4 and the low-level reinjection pipe 13 by setting a regulating valve 7 of the control pipeline to maximize the heat exchange between the geothermal well reinjection tail water and the shallow soil layer with higher level energy, so as to obtain heat of higher energy level, improve the operating efficiency of the ground source heat pump unit, and achieve the goals of energy saving, high efficiency and water saving, thereby realizing the improvement of the existing technology.

[0029] Embodiment 1 A shallow geothermal energy single-well full-recharge ground source heat pump energy-saving system, whose energy-saving principle for summer cooling conditions is: in summer, geothermal well water with a relatively low temperature of 14 to 18°C ​​is pressurized by a submersible pump 14 and enters the water intake pipe 9, then flows through the ground source heat pump unit and enters the geothermal well through the high-level recharge water pipe 4 and the low-level recharge pipe 13 after condensation and heat exchange by the ground source heat pump unit; the water temperature after heat exchange by the condenser of the ground source heat pump unit rises by 6 to 11°C, which is higher than the temperature of the soil and the well wall between the ground below the shallow geothermal well and the water level of the geothermal well. At this time, the regulating valves 7 on the high-level recharge water pipe 4 and the low-level recharge pipe 13 are opened, and the high and low-level recharges are operated simultaneously to maximize the heat exchange area between the recharge water and the underground soil, thereby improving the refrigeration efficiency of the ground source heat pump unit.

[0030] Embodiment 2 A shallow geothermal energy single-well full-recharge ground source heat pump energy-saving system, the energy-saving principle of which in winter heating conditions is as follows: in winter, geothermal well water with a relatively high temperature of 13 to 16°C is pressurized by a submersible pump 14 and enters the water intake pipe 9, then flows through the ground source heat pump unit and enters the geothermal well through the low-level recharge pipe 13 after heat exchange through the evaporator of the ground source heat pump unit; after heat exchange through the evaporator of the ground source heat pump unit, the water temperature is reduced by 5 to 7°C, which is lower than the temperature of the soil and the well wall between the ground below the shallow geothermal well and the water level of the geothermal well. At this time, the regulating valve 7 on the low-level recharge pipe 13 is opened, and the low-level recharge pipe 13 is in operation, which can maximize the heat exchange area between the recharge water and the underground soil, thereby improving the heating efficiency of the ground source heat pump unit.

[0031] In the above two embodiments, the geothermal well used in the shallow geothermal energy single-well full-recharge ground source heat pump energy-saving system is a single-well coaxial, same-layer recharge method.

[0032] The bushing well 5 is a cylindrical structure with an upper flange 6 on the top. Through this structural setting, the wellhead of the bushing well 5 presents a basin-shaped structure; the upper flange 6 is arranged above the drainage layer, and the basin-shaped structure formed by the upper flange 6 can increase the operating width at the end of the bushing well 5.

[0033] In the above two embodiments, in order to control better filtering and heat exchange effects, the water seepage equivalent flow rate of the effective filter element filtering section of the drainage layer 3 is: 0.05~0.1m / s; the equivalent flow rate of the water flow section of the conical flower tube 2, the high-position recharge pipe 4, and the low-position recharge pipe 13 is: 0.05~0.2m / s; the equivalent flow rate of water at the opening of the flower eye 12 is: 0.1~0.5m / s.

Claims

1. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system, characterized by: It comprises a well wall, a drainage layer is arranged inside the well wall, the inner side of the drainage layer is a liner well, a plurality of eyelets are arranged on the liner well, and the bottom end of the liner well is a sedimentation pipe; A plurality of support rings are arranged inside the bushing well, and a water intake pipe is fixed by the support rings. The bottom end of the water intake pipe extends into the sedimentation pipe and a submersible pump is arranged at the bottom end of the water intake pipe. A plurality of reinjection pipes are arranged inside the drainage layer and each reinjection pipe is provided with a switch. The reinjection pipes are divided into high-position reinjection pipes and low-position reinjection pipes, and the high-position reinjection pipes and the low-position reinjection pipes are arranged at different heights of the drainage layer. Seepage holes are arranged on the pipe walls of the high-position reinjection pipes and the low-position reinjection pipes respectively. The axial height of the seepage hole on the high-position reinjection pipe is higher than the axial height position of the seepage hole on the low-position reinjection pipe.

2. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: The drainage layer is formed by stacking a mixture of one or more materials selected from the group consisting of cobblestone, quartz sand, and diatomaceous earth.

3. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: The bottom ends of the high-position recharge pipe and the low-position recharge pipe are both provided with a conical flower tube, and the outer wall of the conical flower tube is provided with a plurality of seepage holes, and the aperture of the seepage holes is 6-10 mm.

4. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: The bushing well is a tubular structure made of plastic or steel pipe, with an upper flange arranged on the top; the upper flange is arranged above the drainage layer.

5. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: The well wall is a gray pipe well pipe, a steel pipe well pipe or a cast iron well pipe.

6. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: The aperture of the eyelet on the bushing well is 8 to 12 mm.

7. A shallow geothermal energy single well full reinjection ground source heat pump energy saving system as claimed in claim 1, characterized in that: Filter screens are arranged on the outer surfaces of the high-position reinjection pipe, the low-position reinjection pipe and the bushing well.

Images