JP3242051U - Hydrothermal geothermal anti-corrosion system - Google Patents

Abstract

A hydrothermal geothermal corrosion protection system is provided. A hydrothermal geothermal anti-corrosion system is a casing structure, including an outer tube and an inner tube (8) fitted into the outer tube, a geothermal heat extraction module made of metal, and an inner tube provided with an outer a thermoelectric unit 4 located between the tube and the inner tube, the negative electrode being in close contact with the inner tube, the positive electrode and the negative electrode being connected by an electrical connecting member to form a connection point located at the heat source; and, under the action of the thermoelectric unit, form a cathodic protection effect on the inner tube. The thermoelectric unit is tightly connected to the geothermal heat extraction module, and the inherent temperature difference between the working medium and the hot water in the geothermal well forms a constant-potential thermoelectromotive potential generator, causing the metal to enter the cathodic state. , cathodic protection brings the protected metal to a thermodynamically stable state, which provides effective corrosion control. [Selection drawing] Fig. 1

Description

The present invention relates to the technical field of geothermal corrosion protection, and more particularly to a hydrothermal geothermal corrosion protection system.

Geothermal is a clean energy, of which hydrothermal geothermal is more widely distributed. Due to the high degree of mineralization of groundwater, when using geothermal heat, whether it is geothermal power generation or direct use, the well pipes, deep well pumps and pipes, wellhead devices, pipes and heat exchangers, etc. Corrosion problems are likely to exist.

In general, geothermal systems can be protected against corrosion by corrosion resistant materials, metal-based modified coatings, anticorrosion additives and cathodic protection. However, anticorrosion paints are costly and susceptible to geothermal water flushing, which reduces or eliminates the performance of anticorrosion coatings and reduces economic viability.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a hydrothermal geothermal anticorrosion system.

The technical problem to be solved by the present invention is to provide a hydrothermal geothermal anti-corrosion system.

In order to achieve the above object, the embodiments of the present invention are:
A geothermal heat extraction module suitable for installation in a geothermal well, being a casing structure, comprising an outer tube and an inner tube fitted into said outer tube, and made of metal;
provided in the inner tube, positioned between the outer tube and the inner tube, a negative electrode is in close contact with the inner tube, and the positive electrode and the negative electrode are connected by an electrical connecting member to the heat source of the geothermal well; and a thermoelectric unit forming a located junction, the action of said thermoelectric unit forming a cathodic protection effect on said inner tube.

Optionally, said outer tube is used to transport a heat source and said inner tube transports a cold source.

Optionally, the hydrothermal geothermal protection system includes a working medium pump having an input end communicating with an annular space surrounded by the outer pipe and the inner pipe and an output end suitable for outputting a heat source to the outside. Including further.

Optionally, the hydrothermal geothermal protection system further comprises a heat supply system having a heat supply end communicating with the output end of said working medium pump and a water return end communicating with said inner tube.

Optionally, the heat supply system comprises a heat exchanger whose input end is connected to the output end of the working medium pump, whose output end is used to output a heat source, and whose input end is the output of the heat exchanger. a heat utilization unit in communication with an end and a return end in communication with the inner tube.

Optionally, said connection point is located in an annular space (5) bounded by said outer tube and said inner tube.

Optionally, said connection point is located in the well wall of said geothermal well.

Optionally, said geothermal heat extraction module adopts one of a vertical casing, a U-shaped casing and a horizontal casing.

Optionally, said thermoelectric unit is provided coaxially with said casing structure.

Optionally, the working medium of said geothermal heat extraction module is groundwater or an organic working medium.

Compared with the prior art, the technical solution of the present invention has the following advantages.

1. An embodiment of the present invention provides a hydrothermal geothermal anti-corrosion system, which is suitable for installation in a geothermal well, has a casing structure, and is fitted with an outer tube and the outer tube. a geothermal heat extraction module made of metal; a geothermal heat extraction module mounted on the inner tube and positioned between the outer tube and the inner tube; a negative electrode is in close contact with the inner tube; a thermoelectric unit in which the positive and negative electrodes are connected by an electrical connection member to form a connection point located at the heat source, the action of the thermoelectric unit forming a cathodic protection effect on the inner tube.

In this way, metal becomes cathodic, and cathodic protection brings the protected metal to a thermodynamically stable state, which provides effective corrosion control. In addition, power generation and corrosion prevention can be efficiently performed in cooperation with each other. Moreover, the economic benefits are significant by reducing the requirements for electrode materials, thereby reducing maintenance costs and difficulty.

In order to describe the specific embodiments of the present invention or the technical solutions of the prior art more clearly, the following briefly describes the drawings used to describe the specific embodiments or the prior art, Apparently, the drawings described below are just some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

1 is a structural schematic view of a hydrothermal geothermal anti-corrosion system according to an embodiment of the present invention; FIG.

The following clearly and completely describes the technical solution of the present invention with reference to the drawings, and clearly, the described embodiments are only some embodiments of the present invention, not all embodiments. . All other embodiments obtained by those skilled in the art based on the embodiments in the present invention without creative efforts are within the patent scope of the present invention.

It should be noted that in the description of the present invention, directions or Positional relationships are based on illustrated orientations or positional relationships and are used only to facilitate and simplify the description of the present invention, such devices or components necessarily have a particular orientation, It is not intended or implied to be constructed or operated in any particular orientation and should not be construed as limiting the invention. Also, it should be understood that the terms "first," "second," and "third" are used for descriptive purposes only and do not indicate or imply relative importance.

In the description of the present invention in the present application, the terms "attach", "connect", and "connect" should be understood in a broad sense, unless otherwise clearly defined or restricted. It may be a direct connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or an internal communication between the two elements. A person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

Also, the technical features according to the various embodiments of the present invention described below can be combined with each other unless they are inconsistent.

Geothermal is a clean energy, of which hydrothermal geothermal is more widely distributed. Due to the high degree of mineralization of groundwater, corrosion occurs in well pipes, deep well pumps and pipes, wellhead devices, pipes and heat exchangers, etc., when using geothermal heat, whether it is geothermal power generation or direct use. problems are likely to exist.

In general, geothermal systems can be protected against corrosion by corrosion resistant materials, metal-based modified coatings, anticorrosion additive and cathodic protection. However, anticorrosion paints are costly and susceptible to geothermal water flushing, which reduces or eliminates the performance of anticorrosion coatings and reduces economic viability.

Accordingly, the present invention provides a hydrothermal geothermal anticorrosion system.

As shown in FIG. 1 , the embodiment of the present invention provides a hydrothermal geothermal anti-corrosion system, which includes a geothermal heat extraction module and a thermoelectric unit 4 .

Specifically, in the embodiment of the present invention, the geothermal heat extraction module is suitable for installation in a geothermal well, the geothermal well is opened in the heat storage layer 1, and the heat storage layer 1 contains a thermal fluid, such as heat there is water Said geothermal heat extraction module is a casing structure, comprising an outer tube and an inner tube 8 fitted in said outer tube. The geothermal heat extraction module is made of metal, and metal having excellent economic efficiency and thermal conductivity can be used. Of course, this embodiment does not limit the specific metal type, and those skilled in the art may choose it according to the actual situation, as long as the same technical effect can be achieved.

A thermoelectric unit 4 is mounted on the inner tube 8 and located between the outer tube and the inner tube 8 . The negative electrode of the thermoelectric unit 4 is in close contact with the inner tube 8, and the positive electrode of the thermoelectric unit 4 and the negative electrode of the thermoelectric unit 4 are connected by an electrical connection member to form a connection point located at the heat source. The working medium in the outer tube or the inner tube 8 serves as the heat source, and the annular space 5 formed by the casing and the inner tube 8 or the well wall 3 of the geothermal well serves as the heat source. The action of the thermoelectric unit 4 forms a cathodic protection effect on the inner tube 8 .

In this way, by intimately connecting the thermoelectric unit 4 to the geothermal heat extraction module, the inherent temperature difference between the working medium and the hot water in the geothermal well forms a thermo-electromotive potential generator whereby the metal The cathodic state is reached, and cathodic protection brings the protected metal to a thermodynamically stable state for effective corrosion control. In addition, power generation and corrosion prevention can be efficiently performed in cooperation with each other. Moreover, the economic benefits are significant by reducing the requirements for electrode materials, thereby reducing maintenance costs and difficulty.

Furthermore, in one alternative embodiment of the present invention, the outer tube is used for transporting heat sources and the inner tube 8 is used for transporting cold sources. Of course, those skilled in the art can adjust the pipelines for transporting the heat source and the cold source according to the actual situation, for example, the outer pipe is used to transport the cold source, and the inner pipe 8 is used to transport the heat source, and it is also necessary to adjust the positive and negative poles of the thermoelectric unit 4 accordingly. Although this embodiment is merely an example, it is not intended to be limiting, and similar technical effects can be achieved.

Moreover, in one optional embodiment of the present invention, the hydrothermal geothermal protection system further includes a working medium pump 2 and a heat supply system. Specifically, the working medium pump 2 has an input end communicating with the annular space 5 surrounded by the outer tube and the inner tube 8, and an output end suitable for outputting a heat source to the outside. The heat supply system has a heat supply end communicating with the output end of the working medium pump 2 and a water return end communicating with the inner pipe 8 .

Furthermore, the heat supply system comprises a heat exchanger 6 and a heat utilization unit 7 . Specifically, the heat exchanger 6 has an input end communicating with an output end of the working medium pump 2 and an output end used to output a heat source. The heat utilization unit 7 communicates with the output end of the heat exchanger 6 at its input end and communicates with the inner pipe 8 at its return end. The heat utilization unit 7 may be a user with heat utilization needs or an institution with other heat utilization needs.

Furthermore, in one embodiment of the invention, said connection point is located in an annular space 5 surrounded by said outer tube and said inner tube 8 .

Furthermore, in one alternative embodiment of the invention, said connection point is located in the well wall 3 of said geothermal well.

Moreover, in one optional embodiment of the present invention, the geothermal heat extraction module adopts one of vertical casing, U-shaped casing and horizontal casing. Of course, those skilled in the art can adjust the type of geothermal heat extraction module according to the actual situation. This embodiment is merely an example and is not intended to be limiting, and similar technical effects can be achieved.

Furthermore, in one alternative embodiment of the invention, said thermoelectric unit 4 is provided coaxially with said casing structure, and the thermoelectric unit is made of a material that can withstand high temperature differences.

Further, in one optional embodiment of the present invention, the working medium of said geothermal heat extraction module is groundwater or organic working medium. In actual operation, the working medium pump 2 extracts geothermal water or a heated organic working medium from the heat storage layer 11 and passes through the annular space 5 between the well wall 3 and the thermoelectric unit for heat exchange with the ground. Then, the heat source is input to the heat utilization unit 7, and the working medium after heat supply becomes a cold fluid and enters the inner tube 8, and then returns to the heat storage layer 1 at the bottom of the well to absorb heat. , then the hot fluid flows through the working medium pump 2 to be extracted and again enters the above-ground heat exchanger 6 to enter the next cycle.

Obviously, the above examples are merely illustrative for purposes of clarity and do not limit the embodiments. Persons skilled in the art can make various other changes or modifications based on the above description. It is not necessary or impossible to cover all embodiments here. Obvious changes or variations derived from this also fall within the patent scope of the present invention.

1 heat storage layer 2 working medium pump 3 well wall 4 thermoelectric unit 5 annular space 6 heat exchanger 7 heat utilization unit 8 inner tube

Claims (10)

A hydrothermal geothermal anticorrosion system,
a geothermal heat extraction module suitable to be installed in a geothermal well, being a casing structure, comprising an outer tube and an inner tube (8) fitted in said outer tube, made of metal;
provided in the inner tube (8), positioned between the outer tube and the inner tube (8), the negative electrode is in close contact with the inner tube (8), and the positive electrode and the negative electrode are connected by an electrical connection member a thermoelectric unit (4) formed to form a connection point located at the heat source of said geothermal well;
A hydrothermal geothermal corrosion protection system, characterized in that the action of the thermoelectric unit (4) forms a cathodic protection effect on the inner tube (8). The hydrothermal geothermal anticorrosion system according to claim 1, characterized in that said outer pipe is used for transporting a heat source and said inner pipe (8) is used for transporting a cold source. It further comprises a working medium pump (2) whose input end communicates with the annular space (5) surrounded by the outer pipe and the inner pipe (8) and whose output end is suitable for outputting a heat source to the outside. The hydrothermal type geothermal corrosion protection system according to claim 1 or 2. 4. Hydrothermal according to claim 3, further comprising a heat supply system whose heat supply end communicates with the output end of said working medium pump (2) and whose return water end communicates with said inner pipe (8). type geothermal anti-corrosion system. The heat supply system is
a heat exchanger (6) whose input end communicates with the output end of the working medium pump (2) and whose output end is used to output a heat source;
5. A heat utilization unit (7) whose input end communicates with the output end of said heat exchanger (6) and whose return end communicates with said inner pipe (8). hydrothermal geothermal anti-corrosion system. 5. A hydrothermal geothermal protection system according to claim 4, characterized in that said connection point is located in an annular space (5) surrounded by said outer pipe and said inner pipe (8). 6. A hydrothermal geothermal protection system according to claim 4 or 5, characterized in that said connection point is located in the well wall (3) of said geothermal well. The hydrothermal geothermal anti-corrosion system according to claim 4 or 5, wherein the geothermal heat extraction module adopts one of a vertical casing, a U-shaped casing and a horizontal casing. 5. Hydrothermal geothermal protection system according to claim 4, characterized in that the thermoelectric unit (4) is provided coaxially with the casing structure. 5. The hydrothermal geothermal anti-corrosion system according to claim 4, wherein the working medium of said geothermal heat extraction module is groundwater or organic working medium.

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