A geothermal energy cascade collection device and utilization system

Abstract

The present invention discloses a geothermal energy cascade collection device and utilization system, including a production well, and also including: a collection unit, including a pump for collecting geothermal water in the production well, a water control component for diverting the geothermal water pumped out by the pump, and a regulating component arranged in the water control component for selecting the flow direction of geothermal water in different temperature ranges. The baffle is driven to the water inlet of the second discharge pipe by an electric cylinder, so that the second discharge pipe is closed, and at this time, the high-temperature geothermal water in the water guide cavity is discharged to the first utilization gradient through the first discharge pipe. If the temperature of the extracted geothermal water meets the medium-temperature geothermal water in the range of 90-95℃, the temperature sensor transmits the temperature signal to the electric cylinder. At this time, the electric cylinder drives the baffle to the water inlet of the first discharge pipe, so that the first discharge pipe is closed, thereby achieving the effect of being able to transport the collected geothermal water in different temperature ranges to different utilization gradients.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal water collection, and in particular to a geothermal energy cascade collection device and a utilization system. Background Art

[0002] Geothermal resources are a widely distributed renewable energy source. According to the different temperatures of geothermal water, they can be divided into high temperature (i.e., temperatures greater than 150°C), medium temperature (i.e., temperatures between 150-90°C), and low temperature (i.e., temperatures less than 90°C).

[0003] Existing geothermal resource utilization methods are often only designed for geothermal fluids in a certain temperature range, ignoring the potential for cascade utilization of geothermal energy and energy conversion, resulting in low energy utilization efficiency. At the same time, since the geothermal temperatures corresponding to different stratum depths are different, the deeper the stratum, the higher the geothermal temperature. However, during the geothermal collection process, existing geothermal collection devices are unable to transport the collected geothermal water to the corresponding utilization area according to the geothermal temperature corresponding to the depth of the geothermal well, and are unable to achieve cascade utilization of geothermal energy.

[0004] Therefore, it is of great significance to develop a system that can perform cascade utilization according to the temperature of geothermal water to promote sustainable development. Through multi-level exploitation and cascade utilization of geothermal resources, combined with solar energy utilization, phase change heat storage technology and multi-functional thermal energy utilization modules, it is not limited to power generation, but also includes regional heating and aquaculture, realizing the diversified utilization of geothermal resources. Each level from high temperature to low temperature is effectively utilized, and energy can be converted into each other.

[0005] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a geothermal energy cascade collection device and utilization system to solve the problem that the existing geothermal collection device mentioned in the above background technology cannot transport the collected geothermal water to the corresponding utilization area according to the geothermal temperature corresponding to the depth of the geothermal well during the geothermal collection process, and cannot realize the cascade utilization of geothermal energy.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A geothermal energy cascade collection device, comprising a production well, and further comprising:

[0009] The collection unit includes a water pump for collecting geothermal water in the production well, a water control component for diverting the geothermal water pumped out by the water pump, and a regulating component provided in the water control component for selecting the flow direction of geothermal water in different temperature ranges;

[0010] The lifting unit includes a mounting plate connected to the outside of the water pump for positioning the water pump, a support ring connected to one end of the mounting plate for supporting the mounting plate, and a pre-tightening component arranged on the outside of the support ring for driving the support ring to be lifted and lowered along the production well.

[0011] Furthermore, the water control component includes:

[0012] A flow guide box connected to a drainage outlet on one side of the water pump;

[0013] The water guiding cavity is arranged inside the flow guiding box, and the upper end of the water guiding cavity is sequentially connected with a first discharge pipe and a second discharge pipe for diverting the geothermal water in the water guiding cavity.

[0014] Furthermore, the adjustment component includes:

[0015] A bracket, fixedly connected to one side of the guide box;

[0016] An electric cylinder is fixedly connected to the upper end of the bracket, and a reserved hole for guiding the driving end of the electric cylinder is provided outside the driving end of the electric cylinder and inside the guide box;

[0017] A baffle is fixedly connected to the driving end of the electric cylinder and is located inside the water guiding cavity. The upper end of the baffle contacts the top of the water guiding cavity and is used to control the flow direction of the geothermal water in the water guiding cavity to the first discharge pipe and the second discharge pipe.

[0018] Furthermore, the preload assembly comprises:

[0019] There are at least three guide shafts, which are slidably inserted in the support ring, and holes for guiding the guide shafts are provided outside the guide shafts and inside the support ring;

[0020] A limit block, fixedly connected to one end of the guide shaft and located inside the support ring, used for limiting the position of multiple guide shafts;

[0021] A containing frame, fixedly connected to one end of the guide shaft opposite to the limit block;

[0022] A driving wheel is rotatably connected to the interior of the accommodating frame. A motor for driving the driving wheel to rotate is disposed at one end of the driving wheel and located inside the accommodating frame.

[0023] Furthermore, a tightening spring is sleeved on the outer side of the guide shaft and between the support ring and the containing frame, and is used to tighten the containing frame.

[0024] The present invention also provides a geothermal water temperature graded cascade heat energy utilization system, comprising a geothermal energy cascade collection device, and further comprising:

[0025] A power generation module is provided at the high temperature output end of the water control component and is used to generate electricity from the collected high temperature geothermal water with a temperature of 95-150°C;

[0026] A heating module is provided at the medium-temperature output end of the water control component and the output end of the power generation module, and is used to heat the medium-temperature geothermal water collected at a temperature in the range of 90-95°C and the medium-temperature tail water of the power generation module;

[0027] The aquaculture module is arranged at the output end of the heating module and is used for carrying out aquaculture work on the tail water whose temperature is less than 90° C. after heating.

[0028] Furthermore, the geothermal water in the power generation module is divided into two parts, one part of which is geothermal water with a temperature between 95-135°C. The steam generated is heated into superheated steam by a solar boiler, and then sent to the high-pressure cylinder of the steam turbine unit for work, and finally transported to the flash evaporator. The other part of the geothermal water with a temperature between 135-150°C is directly introduced into the flash evaporator. The flash evaporator evaporates the geothermal water to make the medium and low-pressure cylinders of the steam turbine unit work, and the electric energy generated in the work process is sent to the power grid through the transmission device for power distribution.

[0029] Furthermore, the aquaculture module exchanges heat between geothermal water and aquaculture pond water through a heat exchanger to keep the temperature of the aquaculture pond water constant, and the tail water returned from the aquaculture module after heat exchange is returned to the recharging well after decontamination.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention makes the inner diameter of the wall of the production well smaller than the inner diameter of the circumscribed circle where the multiple groups of driving wheels are located, so that the tensioning spring is in a compression device, and the tensioning spring has an elastic effect on the accommodating frame, so that the accommodating frame is pressed against the wall of the production well through the driving wheel, and the motor in the accommodating frame is started, and the motor drives the driving wheel to rotate. The driving wheel drives the accommodating frame to move downward along the production well under the action of the friction between the driving wheel and the wall of the production well, and the accommodating frame drives the supporting ring to move downward through the guide shaft, and the supporting ring drives the water pump to move downward along the production well into the geothermal water through the mounting plate. In this process, the first drainage pipe and the second drainage pipe extend downward with the water pump. When the geothermal water of the corresponding depth is pumped out, the depth of the water pump can be adjusted by controlling the rotation of the driving wheel. When the water pump needs to be taken out of the production well for maintenance, the driving wheel can be controlled to rotate in the opposite direction to realize the ascent of the water pump, thereby achieving the effect of being able to extract geothermal water at different depths and facilitating the maintenance of the water pump.

[0032] 2. The present invention arranges a temperature sensor at the upper end of the electric cylinder. If the temperature of the extracted geothermal water meets the high-temperature geothermal water temperature of above 95°C, the temperature sensor transmits the temperature signal to the electric cylinder. At this time, the electric cylinder drives the baffle to the water inlet of the second discharge pipe, so that the second discharge pipe is closed. At this time, the high-temperature geothermal water in the water guide cavity is discharged to the primary utilization gradient through the first discharge pipe. If the temperature of the extracted geothermal water meets the medium-temperature geothermal water temperature in the range of 90-95°C, the temperature sensor transmits the temperature signal to the electric cylinder. At this time, the electric cylinder drives the baffle to the water inlet of the first discharge pipe, so that the first discharge pipe is closed. At this time, the medium-temperature geothermal water in the water guide cavity is discharged to the secondary utilization gradient through the second discharge pipe, thereby achieving the effect of being able to transport the collected geothermal water in different temperature ranges to different utilization gradients.

[0033] 3. The present invention realizes diversified utilization of geothermal resources by applying the high-temperature geothermal water discharged from the first discharge pipe to the first-level utilization gradient for power generation, applying the tail water remaining after the first-level utilization gradient power generation and the medium-temperature geothermal water discharged from the second discharge pipe to the second-level utilization gradient for heating, and using the geothermal water after the heating work for the third-level utilization gradient aquaculture, and finally returning the geothermal water returned from the aquaculture module to the recharge well, so as to achieve the effect of effective utilization of each level from high temperature to low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle;

[0036] Figure 3 This is a diagram showing the coordination relationship between the lifting unit and the collection unit of the present invention;

[0037] Figure 4 This is a diagram showing the coordination relationship between the water control component and the regulating component of the present invention;

[0038] Figure 5 It is a schematic diagram of the step utilization of the present invention.

[0039] Figure numerals: 100, production well; 101, reinjection well; 1, lifting unit; 2, collection unit; 11, mounting plate; 12, support ring; 13, pre-tightening assembly; 131, guide shaft; 132, limit block; 133, tightening spring; 134, accommodating frame; 135, driving wheel; 21, water pump; 211, filter screen; 212, drain outlet; 22, water control assembly; 221, guide box; 222, water guide cavity; 223, first discharge pipe; 224, second discharge pipe; 225, reserved hole; 23, adjustment assembly; 231, bracket; 232, electric cylinder; 233, baffle; 234, temperature sensor; 3, power generation module; 4, heating module; 5, aquaculture module. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1

[0042] See also Figure 1-4 , the present invention provides a technical solution:

[0043] A geothermal energy cascade collection device includes a production well 100 and further includes:

[0044] The collection unit 2 includes a water pump 21 for collecting geothermal water in the production well 100, a water control component 22 for diverting the geothermal water pumped out by the water pump 21, and a regulating component 23 provided in the water control component 22 for selecting the flow direction of geothermal water in different temperature ranges;

[0045] The lifting unit 1 includes a mounting plate 11 connected to the outside of the water pump 21 for positioning the water pump 21, a support ring 12 connected to one end of the mounting plate 11 for supporting the mounting plate 11, and a pre-tightening component 13 arranged on the outside of the support ring 12 for driving the support ring 12 to be lifted and lowered along the production well 100.

[0046] As an improvement, the water control component 22 includes:

[0047] The guide box 221 is connected to the drain port 212 on one side of the water pump 21;

[0048] The water guiding chamber 222 is disposed inside the flow guiding box 221, and the upper end of the water guiding chamber 222 is sequentially connected to a first discharge pipe 223 and a second discharge pipe 224 for diverting the geothermal water in the water guiding chamber 222;

[0049] Preferably, a filter screen 211 is provided at the water inlet of the water pump 21 for filtering the pumped geothermal water.

[0050] Furthermore, the adjustment component 23 includes:

[0051] A bracket 231, fixedly connected to one side of the flow guide box 221;

[0052] The electric cylinder 232 is fixedly connected to the upper end of the bracket 231. A reserved hole 225 for guiding the driving end of the electric cylinder 232 is provided outside the driving end of the electric cylinder 232 and inside the guide box 221;

[0053] The baffle 233 is fixedly connected to the driving end of the electric cylinder 232 and is located inside the water guiding cavity 222. The upper end of the baffle 233 contacts the top of the water guiding cavity 222 and is used to control the flow direction of the geothermal water in the water guiding cavity 222 to the first discharge pipe 223 and the second discharge pipe 224.

[0054] The first discharge pipe 223 is used to discharge high-temperature geothermal water, and the second discharge pipe 224 is used to discharge medium-temperature geothermal water.

[0055] As an improvement, the pre-tightening assembly 13 comprises:

[0056] The guide shafts 131 are provided with at least three groups and are slidably inserted in the support ring 12. The outer side of the guide shafts 131 and the inner side of the support ring 12 are provided with holes for guiding the guide shafts 131.

[0057] A limit block 132, fixedly connected to one end of the guide shaft 131 and located inside the support ring 12, for limiting the position of the guide shaft 131;

[0058] A receiving frame 134, fixedly connected to one end of the guide shaft 131 opposite to the limiting block 132;

[0059] A driving wheel 135 is rotatably connected to the inside of the containing frame 134. A motor for driving the driving wheel 135 to rotate is disposed at one end of the driving wheel 135 and located inside the containing frame 134;

[0060] The inner diameter of the wall of the production well 100 is smaller than the inner diameter of the circumscribed circle where the multiple sets of driving wheels 135 are located.

[0061] Furthermore, a tightening spring 133 is sleeved outside the guide shaft 131 and between the support ring 12 and the containing frame 134 , and is used to tighten the containing frame 134 .

[0062] It should be noted that: in the specific implementation process of the present invention, when collecting geothermal water, the collection device is placed as a whole in the production well 100. At this time, since the inner diameter of the wall of the production well 100 is smaller than the inner diameter of the circumscribed circle where the multiple sets of driving wheels 135 are located, the tightening spring 133 is in a compression device, and the tightening spring 133 has an elastic force on the containing frame 134, so that the containing frame 134 is pressed against the wall of the production well 100 through the driving wheel 135, and the motor in the containing frame 134 is started, and the motor drives the driving wheel 135 to rotate. The driving wheel 135 drives the containing frame 134 to move downward along the production well 100 under the action of the friction between the driving wheel 135 and the wall of the production well 100. The accommodating frame 134 drives the support ring 12 to move downward through the guide shaft 131, and the support ring 12 drives the water pump 21 to move downward along the production well 100 into the geothermal water through the mounting plate 11. In this process, the first drainage pipe 223 and the second drainage pipe 223 extend downward with the water pump 21. When the geothermal water of the corresponding depth is pumped out, the depth of the water pump 21 can be adjusted by controlling the driving wheel 135 to rotate. When the water pump 21 needs to be taken out of the production well 100 for maintenance, the driving wheel 135 can be controlled to rotate in the opposite direction to realize the ascent of the water pump 21, thereby achieving the effect of being able to extract geothermal water at different depths and facilitating the maintenance of the water pump 21.

[0063] When the water pump 21 collects geothermal water, the geothermal water enters the water pump 21 through the filter screen 211 and is discharged into the water guide cavity 222 at the drain port 212 for diversion;

[0064] When extracting geothermal water of different temperatures corresponding to different stratum depths, the present invention sets a temperature sensor 234 at the upper end of the electric cylinder 232. If the temperature of the extracted geothermal water meets the high-temperature geothermal water of 95°C or above, the temperature sensor 234 transmits the temperature signal to the electric cylinder 232. At this time, the electric cylinder 232 drives the baffle 233 to the water inlet of the second discharge pipe 224, so that the second discharge pipe 224 is closed. At this time, the high-temperature geothermal water in the water guide cavity 222 is discharged to the primary utilization gradient through the first discharge pipe 223. If the temperature of the extracted geothermal water meets the medium-temperature geothermal water in the range of 90-95°C, the temperature sensor 234 transmits the temperature signal to the electric cylinder 232. At this time, the electric cylinder 232 drives the baffle 233 to the water inlet of the first discharge pipe 223, so that the first discharge pipe 223 is closed. At this time, the medium-temperature geothermal water in the water guide cavity 222 is discharged to the secondary utilization gradient through the second discharge pipe 224, thereby achieving the effect of being able to transport the collected geothermal water in different temperature ranges to different utilization gradients.

[0065] Embodiment 2

[0066] like Figure 5 As shown, a geothermal water temperature graded cascade heat energy utilization system comprises:

[0067] The power generation module 3 is provided at the high temperature output end of the water control component 22 and is used to generate electricity from the collected high temperature geothermal water with a temperature of 95-150°C;

[0068] The heating module 4 is provided at the medium-temperature output end of the water control component 22 and the output end of the power generation module 3, and is used to heat the medium-temperature geothermal water collected at a temperature in the range of 90-95°C and the medium-temperature tail water of the power generation module 3;

[0069] The aquaculture module 5 is provided at the output end of the heating module 4 and is used for aquaculture work on the tail water whose temperature is less than 90°C after heating;

[0070] The second discharge pipe 224 of the water control component 22 for discharging medium-temperature geothermal water is connected to the heating module 4 , and the first discharge pipe 223 of the water control component 22 for discharging high-temperature geothermal water is connected to the power generation module 3 .

[0071] As an improvement, the geothermal water in the power generation module 3 is divided into two parts, one part of which is geothermal water with a temperature between 95-135°C. The steam generated is heated to superheated steam by a solar boiler, and then sent to the high-pressure cylinder of the steam turbine unit for work, and finally sent to the flash evaporator. The other part of the geothermal water with a temperature between 135-150°C is directly introduced into the flash evaporator. The flash evaporator evaporates the geothermal water so that the medium and low pressure cylinders of the steam turbine unit work, and the electric energy generated in the work process is sent to the power grid through the transmission device for power distribution;

[0072] The solar boiler heats the saturated steam from the geothermal source into superheated steam, increasing its enthalpy value; and stores the excess heat in the thermal storage subsystem so that the power generation system can rely on the stored solar energy to maintain normal operation in the morning and evening and during the intermittent cloud cover during the day.

[0073] Furthermore, the aquaculture module exchanges heat between geothermal water and aquaculture pond water through a heat exchanger to keep the temperature of the aquaculture pond water constant. The tail water returned from the aquaculture module after heat exchange is returned to the recharging well 101 after decontamination.

[0074] It should be added that the solar boiler in the present invention is mainly composed of a concentrating and collecting subsystem and a heat storage subsystem. The concentrating and collecting subsystem includes a concentrator, a receiver and a tracking device, which is mainly used to ensure the maximum reception of solar thermal energy; while the heat storage subsystem is used to maintain normal operation by relying on stored solar energy in the morning and evening or during the intervals of cloud cover during the day.

[0075] In addition, the present invention can also connect a set of third discharge pipes connected to the aquaculture module 5 to the flow guide box 221 to discharge the low-temperature geothermal water into the aquaculture module 5 for use. The third discharge pipe is not drawn in the figure.

[0076] It should be noted that the present invention applies the high-temperature geothermal water discharged from the first discharge pipe 223 to the first-level gradient for power generation, applies the tail water remaining after the first-level gradient power generation and the medium-temperature geothermal water discharged from the second discharge pipe 224 to the second-level gradient for heating, and uses the geothermal water after the heating for the third-level gradient aquaculture, and finally returns the geothermal water refluxed from the aquaculture module 5 to the recharge well 101, thereby realizing the diversified utilization of geothermal resources, and achieving the effect of effective utilization of each level from high temperature to low temperature.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A geothermal energy cascade collection device, comprising a production well (100), characterized in that: Also includes: A collection unit (2) comprises a water pump (21) for collecting geothermal water in a production well (100), a water control component (22) for diverting geothermal water pumped out by the water pump (21), and a regulating component (23) provided on the water control component (22) for selecting the flow direction of geothermal water in different temperature ranges; The lifting unit (1) comprises a mounting plate (11) connected to the outside of the water pump (21) for positioning the water pump (21), a support ring (12) connected to one end of the mounting plate (11) for supporting the mounting plate (11), and a pre-tightening component (13) arranged on the outside of the support ring (12) for driving the support ring (12) to be lifted and lowered along the production well (100); The water control component (22) comprises: A flow guide box (221) connected to a drainage port (212) on one side of the water pump (21); A water guide chamber (222) is arranged inside the guide box (221), and the upper end of the water guide chamber (222) is sequentially connected to a first discharge pipe (223) and a second discharge pipe (224) for diverting geothermal water in the water guide chamber (222); The upper end of the flow guide box (221) is connected to a third drainage pipe which is in communication with the aquaculture module (5); The adjustment component (23) comprises: A bracket (231) fixedly connected to one side of the flow guide box (221); An electric cylinder (232) is fixedly connected to the upper end of the bracket (231), and a reserved hole (225) for guiding the driving end of the electric cylinder (232) is provided outside the driving end of the electric cylinder (232) and inside the guide box (221); a baffle (233) fixedly connected to the driving end of the electric cylinder (232) and located inside the water guiding cavity (222); an upper end of the baffle (233) in contact with the top of the water guiding cavity (222) and used to control the flow direction of the geothermal water in the water guiding cavity (222) to the first discharge pipe (223) and the second discharge pipe (224); The pre-tightening assembly (13) comprises: The guide shafts (131) are provided with at least three groups and are slidably inserted into the support ring (12); holes for guiding the guide shafts (131) are provided outside the guide shafts (131) and inside the support ring (12); A limit block (132), fixedly connected to one end of the guide shaft (131) and located inside the support ring (12), and used for limiting the position of the guide shaft (131); A containing frame (134) fixedly connected to one end of the guide shaft (131) opposite to the limiting block (132); A driving wheel (135) is rotatably connected to the interior of the containing frame (134); a motor for driving the driving wheel (135) to rotate is provided at one end of the driving wheel (135) and located inside the containing frame (134); A tightening spring (133) is sleeved outside the guide shaft (131) and located between the support ring (12) and the containing frame (134), and is used to tighten the containing frame (134).

2. A geothermal energy cascade utilization system, comprising a geothermal energy cascade collection device according to claim 1, characterized in that: Also includes: A power generation module (3) is provided at the high temperature output end of the water control component (22) and is used to generate electricity using the collected high temperature geothermal water with a temperature of 95-150° C.; A heating module (4) is provided at the medium-temperature output end of the water control component (22) and the output end of the power generation module (3), and is used to heat the medium-temperature geothermal water collected at a temperature in the range of 90-95° C. and the medium-temperature tail water of the power generation module (3); The aquaculture module (5) is arranged at the output end of the heating module (4) and is used for carrying out aquaculture work on the tail water whose temperature is less than 90° C. after heating.

3. A geothermal energy cascade utilization system according to claim 2, characterized in that: The geothermal water in the power generation module (3) is divided into two parts, one part of which has a temperature between 95 and 135°C. The steam generated by the geothermal water is heated to superheated steam by a solar boiler, and then sent to the high-pressure cylinder of the steam turbine unit for work, and finally sent to the flash evaporator. The other part of the geothermal water with a temperature between 135 and 150°C is directly introduced into the flash evaporator. The flash evaporator evaporates the geothermal water so that the medium and low pressure cylinders of the steam turbine unit work. The electric energy generated in the work process is sent to the power grid through the power transmission device for power distribution.

4. A geothermal energy cascade utilization system according to claim 3, characterized in that: The aquaculture module exchanges heat between geothermal water and aquaculture pond water through a heat exchanger to keep the temperature of the aquaculture pond water constant. The tail water returned from the aquaculture module after heat exchange is decontaminated and returned to the recharging well (101).

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