Geothermal carbon dioxide power generation device

Abstract

Geothermal carbon dioxide power generation device comprising a conduit (1) for transferring a geothermal medium to an evaporator (3), wherein the evaporator (3) converts the geothermal medium into steam and then drives a steam turbine (5) to rotate, the steam turbine (5) rotating to drive a power generator (6) to generate electricity, characterized in that it further comprises a cooling mechanism (7) connected to the steam turbine (5), the cooling mechanism (7) comprising: a steam condenser (70) provided on one side of the steam turbine, wherein a gas inlet of the steam condenser is connected to a gas outlet of the steam turbine, while a fluid outlet of the steam condenser is connected to the evaporator (3) via a first water circulation pipe (71), and while a gas outlet of the steam condenser is connected to an exhaust pipe (72), the exhaust pipe (72) being provided with a second vacuum pump (76) at an end facing away from the steam condenser (70); a first vacuum pump (73) provided on one side of the exhaust pipe (72), wherein a gas outlet of the first vacuum pump is connected to the first water circulation pipe (71) via a second water circulation pipe (743); wherein the power of the first vacuum pump (73) is greater than the power of the second vacuum pump (76).

Description

TECHNICAL AREA

[0001] This disclosure concerns the technical field of geothermal power generation, in particular a geothermal carbon dioxide power generation device and a control method. STATE OF THE ART

[0002] A geothermal carbon dioxide power plant is a facility that uses geothermal heat to generate electricity. Geothermal energy is renewable because it is constantly extracted from the Earth's interior. Unlike fossil fuels, it is inexhaustible and provides a continuous supply of electricity, which is why the cost of carbon dioxide generation is lower.Geothermal carbon dioxide power generation is characterized by high stability, geographical dispersal, and low operating costs; the construction of geothermal power plants is relatively simple and associated with low environmental and social impacts; the existing geothermal carbon dioxide power generation device includes basic components such as a conduit, an evaporator, a steam turbine, and a power generator, with the conduit transferring the geothermal medium to the evaporator, and steam being generated through evaporation, which drives the steam turbine to drive the generator to produce electricity;

[0003] However, the existing geothermal carbon dioxide power generation device has the following problems: (1) Insufficient cooling efficiency: The efficiency of reusing the steam after condensation is low, resulting in suboptimal energy use of the geothermal medium, (2) Higher energy consumption: Conventional cooling mechanisms usually use a single vacuum pump which is unable to dynamically adjust the pumping power at different ambient temperatures, resulting in a waste of electricity. CONTENT OF THE PRESENT DISCLOSURE

[0004] To solve the problems mentioned above, this disclosure provides a geothermal carbon dioxide power generation device and a control method. This disclosure employs a hierarchical control technology with two vacuum pumps (dynamically switching the first and second vacuum pumps on and off depending on the ambient temperature), which is capable of dynamically adjusting the pump output, reducing energy consumption for cooling, and improving circulation efficiency.

[0005] The following is a description of the technical content of the disclosure: A geothermal carbon dioxide power generation device comprising a conduit for transferring a geothermal medium to an evaporator, wherein the evaporator converts the geothermal medium into steam and then drives a steam turbine to rotate, the steam turbine rotating to drive a power generator to generate electricity, characterized in that it further comprises a cooling mechanism connected to the steam turbine, the cooling mechanism comprising: a steam condenser provided on one side of the steam turbine, wherein a gas inlet of the steam condenser is connected to a gas outlet of the steam turbine, while a fluid outlet of the steam condenser is connected to the evaporator via a first water circulation tube, and while a gas outlet of the steam condenser is connected to an exhaust pipe, wherein the exhaust pipe is provided with a second vacuum pump at an end facing away from the steam condenser; a first vacuum pump provided on one side of the exhaust pipe, wherein a gas outlet of the first vacuum pump is connected to the first water circulation pipe via a second water circulation pipe; wherein the power of the first vacuum pump is greater than the power of the second vacuum pump.

[0006] Furthermore, the second vacuum pump and the exhaust pipe are connected to each other by a connecting pipe, wherein the inner diameter of the connecting pipe is smaller than the inner diameter of the exhaust pipe.

[0007] Furthermore, the connecting pipe is provided with a first filter element and a desiccant, the desiccant being provided on one side of the filter element facing the second vacuum pump.

[0008] Furthermore, a condensation tube is provided at a connection point between the first vacuum pump and the second water circulation tube, and wherein an inlet and an outlet of the condensation tube are connected to the condenser.

[0009] Furthermore, a vent hole is provided on one surface of the second water circulation pipe.

[0010] Furthermore, a filter mechanism is provided between the conduit pipe and the evaporator, the filter mechanism comprising the following: a mounting frame that is provided between the conduit pipe and the evaporator and has an outlet groove on one underside; a mounting frame provided within the mounting frame, wherein the mounting frame is provided inside with a filter mat fabric.

[0011] Furthermore, the mounting frame is equipped with a spring; wherein the filter mat fabric is provided with a mounting plate on one side; wherein the mounting plate is provided on a side facing the filter mat fabric with a drive assembly, wherein a guide structure is provided between the drive assembly and the mounting plate, and wherein the guide structure limits the drive assembly so that it performs a linear back-and-forth movement in a horizontal direction; wherein, when the drive assembly performs a back-and-forth movement in a horizontal direction, it sets the spring into oscillation and thus collides with the filter mat fabric.

[0012] Furthermore, the drive assembly is provided on a side facing the filter mat fabric with at least one projecting section; and wherein, when the drive assembly performs a back-and-forth movement in a horizontal direction, a top surface of the projecting section periodically comes into contact with a spiral gap of the spring, causing the spring to deform elastically and release, thereby colliding with the filter mat fabric.

[0013] Furthermore, the mounting frame is provided with an outlet groove on the underside, with the outlet groove being located below the filter mat fabric.

[0014] A control procedure for the geothermal carbon dioxide power generation device includes the following steps: Switching off the second vacuum pump and switching on the first vacuum pump if an ambient temperature exceeds a threshold during the power generation process of the geothermal carbon dioxide power generation device; Switching off the first vacuum pump and switching on the second vacuum pump when the ambient temperature falls below a threshold.

[0015] Compared to the prior art, the present disclosure offers the following advantages: The present disclosure uses the cooling mechanism to liquefy the geothermal medium and then transfer it to the evaporator so that it can continue to generate electricity and the effect of cyclical power generation is achieved;

[0016] The cooling mechanism incorporates two vacuum pumps. When the ambient temperature exceeds a threshold, the second vacuum pump is switched off and the first vacuum pump is switched on. The first vacuum pump continuously pumps out water vapor, so that the water vapor, which drives the steam turbine 5 to rotate, is continuously pumped into the condenser along with the air, condenses into a liquid in the condenser, and then flows into the first water circulation pipe to be conveyed to the evaporator.

[0017] As the ambient temperature decreases, the amount of water vapor decreases because some of the steam in the delivery pipe between the steam turbine and the cooling mechanism 7 condenses into a liquid before reaching the cooling mechanism 7. It is a greater waste of electricity to continue using a high-power vacuum pump for pumping, so at this point it is possible to switch off the first vacuum pump and switch on the second vacuum pump, which has a lower power rating and is also capable of pumping the water vapor into the condenser. This is because the second vacuum pump has a lower power rating and therefore saves electricity.

[0018] Further features and advantages of this disclosure are explained in the following description and are partly evident from the description or become clear from the execution of the disclosure. The objectives and other advantages of the disclosure can be realized and achieved through the structures specified in the description, the claims, and the drawings. BRIEF DESCRIPTION OF THE DRAWING

[0019] To clarify the objectives, technical solutions, and advantages of the embodiments described in this disclosure, the technical solutions in these embodiments, in conjunction with the accompanying drawings, are explained clearly and completely below. It is evident that the described embodiments represent a subset of the embodiments described in this disclosure and not all of them. Based on the embodiments described in this disclosure, all other embodiments that a person skilled in the art could achieve without inventive step fall within the scope of this disclosure. Fig. Figure 1 shows a schematic representation of a method of the present invention; Fig. Figure 2 shows a schematic representation of the structure of a filter mechanism of the present invention; Fig. Figure 3 shows a schematic representation of the structure of a cleaning element of the present invention; Fig. Figure 4 shows a schematic representation of the structure of a filter element of the present invention; Fig. Figure 5 shows a schematic representation of the structure of a cooling mechanism of the present invention; Fig. Figure 6 shows a schematic representation of the structure of a connecting tube of the present invention. Reference symbol list:

[0020] 1-Line pipe; 2-Filter mechanism; 20-Mounting frame; 21-Outlet groove; 22-Sealing plate; 23-Filter element; 230-Mounting frame; 231-Filter mat fabric; 232-Spring; 24-Cleaning element; 240-Mounting plate; 241-Limiting plate; 242-Linear motor; 243-Drive assembly; 3-Evaporator; 4-Guide tube; 5-Steam turbine; 6-Power generator; 7-Cooling mechanism; 70-Steam condenser; 71-First water circulation pipe; 72-Exhaust pipe; 73-First vacuum pump; 74-Condensing element; 740-Connecting pipe; 741-Condensing tube; 742-Condenser; 743-second water circulation pipe; 744-vent hole; 75-connecting pipe; 750-receiving groove; 751-first filter element; 752-desiccant receiving door; 753-filter hole; 76-second vacuum pump. DETAILED DESCRIPTION

[0021] To clarify the objectives, technical solutions, and advantages of the embodiments described in this disclosure, the technical solutions in these embodiments, in conjunction with the accompanying drawings, are explained clearly and completely below. It is evident that the described embodiments represent a subset of the embodiments described in this disclosure and not all of them. Based on the embodiments described in this disclosure, all other embodiments that a person skilled in the art could achieve without inventive step fall within the scope of this disclosure.

[0022] Fig. Figures 1 to 6 represent the schematic diagrams of the device of the present invention, which comprises the following: a conduit 1, wherein a filter mechanism 2 is mounted on the surface of the conduit 1 and an evaporator 3 is mounted at one end of the conduit 1, wherein a guide tube 4 is mounted on the top of the evaporator 3, wherein a steam turbine 5 is mounted at one end of the guide tube 4, wherein a power generator 6 is mounted on one side of the steam turbine 5, and wherein a cooling mechanism 7 is mounted on one side of the steam turbine 5.

[0023] As in Fig. As shown in section 5, the cooling mechanism 7 comprises the following: a steam condenser 70, which is mounted on one side of the steam turbine 5, a first water circulation pipe 71 is provided at the fluid outlet of the steam condenser 70, an exhaust pipe 72 and a first vacuum pump 73, which is connected to the exhaust pipe 72, are connected to the fluid outlet of the steam condenser 70, a condensing element 74 is mounted on the underside of the first vacuum pump 73, and a second vacuum pump 76 is connected to an end of the exhaust pipe 72 facing away from the steam condenser 70;

[0024] A connecting pipe 75 (as in Fig. 6 shown) connects the second vacuum pump 76 to the exhaust pipe 72, wherein an inner pipe diameter of the connecting pipe 75 is smaller than the inner pipe diameter of the exhaust pipe 72;

[0025] The condensing element 74 comprises a connecting pipe 740 and a second water circulation pipe 743; the connecting pipe 740 is mounted on the underside of the first vacuum pump 73, and a condensing pipe 741 is connected to the surface of the connecting pipe 740 in a coil, and the inlet and outlet of the condensing pipe 741 are connected to a condenser 742; a second water circulation pipe 743 is provided at the fluid outlet of the condensing pipe 741, and a vent hole 744 is provided on the surface of the second water circulation pipe 743;

[0026] The connecting pipe 75 includes a receiving groove 750, wherein the receiving groove 750 is fixedly connected to one side of the exhaust pipe 72, a first filter element 751 (optional filter tube) is mounted inside the receiving groove 750, filter holes 753 are provided on both sides of the first filter element 751, and a desiccant receiving door 752 is provided on one side of the first filter element 751.

[0027] By specifying the inner diameter of the connecting pipe 75 and the arrangement of the desiccant intake door (which can fill with desiccant), the problem of the vacuum pump being susceptible to condensation of water vapor, especially in a low-temperature environment, which can lead to malfunctions due to water ingress and impair the continuous operation of the system, can be solved.

[0028] As in Fig. As shown in 2, the filter mechanism includes the following: a mounting frame 20, which is mounted on the surface of the conduit 1, an outlet groove 21 is provided on the underside of the mounting frame 20, a sealing plate 22 is screwed to the underside of the outlet groove 21, and a filter element 23 is mounted inside the mounting frame 20 (as shown in Fig. 4 shown);

[0029] The filter element 23 comprises a mounting frame 230, the mounting frame 230 is firmly connected to the inside of the mounting frame 20, a filter mat fabric 231 is mounted inside the mounting frame 230, and a spring 232 is firmly connected to the surface of the mounting frame 230;

[0030] A cleaning element 24 is mounted on the surface of the filter element 23 (as shown in Fig. 3 shown), the cleaning element 24 comprises a mounting plate 240, the mounting plate 240 is fixedly connected to the inside of the mounting frame 20, a limiting plate 241 is fixedly connected to one side of the mounting plate 240, a linear motor 242 is movably connected to the surface of the limiting plate 241, and a drive assembly 243 (a rack may be used) is mounted at the output end of the linear motor 242.

[0031] This filter mechanism solves the problem that impurities in the geothermal medium easily clog the filter components, which often need to be disassembled and cleaned manually, posing a risk of secondary contamination and being time-consuming and labor-intensive. 2. Specific workflow and principle: (1) Energy conversion process:

[0032] The conduit pipe 1 is sunk into the underground high-temperature rock layer, the carbon dioxide gas is transferred through the conduit pipe 1, and then transferred to the evaporator 3. The carbon dioxide gas is used to heat the water in the evaporator 3, and the water evaporates at high temperature to produce gas, which is then transferred to the steam turbine 5 for the conversion of electrical energy, and then to the power generator 6 for electricity generation. (2) Filtration and purification process:

[0033] When the conduit 1 carries carbon dioxide gas, the carbon dioxide gas is filtered through the filter element 23, and the carbon dioxide gas is filtered through the filter mat fabric 231. When the filter mat fabric 231 needs cleaning, the sealing plate 22 is opened, and the activated linear motor 242 drives the rack 243, which moves horizontally back and forth on the surface of the limiting plate 241. As the gear teeth of the rack 243 move on the spring 232, the coils of the spring 232 impede the movement of the gear teeth, causing the gear teeth to pivot the spring 232 during the movement of the rack 243. This causes the spring 232 to oscillate and subsequently strike the filter mat fabric 231.The dust on the filter mat fabric 231 is shaken off, and the dust falls through the outlet groove 21, thus achieving the cleaning effect of the filter mat fabric 231. There is no need to disassemble the filter mechanism 2, which avoids a variety of problems caused by manual dusting and solves the prior art technical problem of having to manually clean the filter mat fabric 231 due to clogging. This cleaning process is prone to secondary contamination and is time-consuming and labor-intensive. In contrast, it achieves the technical effect of automatic cleaning, is convenient and easy to use, does not cause secondary contamination, and extends the service life of the filter mechanism 2 while maintaining its filtering efficiency. (3) Operating logic of the cooling mechanism:

[0034] Once the steam turbine 5 is in operation to convert electrical energy, the steam is converted into liquid by the cooling mechanism 7 and then conveyed through the pipeline to the evaporator 3 for circulation: In warm weather: The second vacuum pump 76 is switched off and the first vacuum pump 73 is switched on; the steam turbine 5 is set in motion after the steam, along with the air, has been pumped into the steam condenser 70; the steam in the steam condenser 70 condenses into a liquid and flows into the first water circulation pipe 71. The water in the first water circulation pipe 71 is further evaporated into steam after high temperatures and other treatments, which drives the steam turbine 5 further, and some of the steam is discharged into the atmosphere by the first vacuum pump 73; In cold weather: Some of the steam condenses into a liquid in the conveying pipe between the steam turbine 5 and the cooling mechanism 7 before reaching the cooling mechanism 7, and the amount of water vapor decreases. At this point, the first vacuum pump 73 is switched off, the second vacuum pump 76 is switched on, and the air is pumped out by the second vacuum pump 76, which can also pump water vapor into the steam condenser 70.Since the power of the second vacuum pump 76 is lower, electricity is saved; the inner diameter of the connecting pipe 75 is smaller than the inner diameter of the exhaust pipe 72, thus reducing the possibility of water condensed from the water vapor in the exhaust pipe 72 flowing through the connecting pipe 75 into the second vacuum pump 76, and thus reducing the possibility of the second vacuum pump 76 being damaged by the water; when the first vacuum pump 73 is running, the condenser 742 is activated, and cold water from the condenser 742 continuously enters from the inlet of the condensation pipe 741, flows out of the outlet of the condensation pipe 741 and then flows back into the condenser 742.The cold water continuously cools the condensation tube 741, and the water vapor exits the first vacuum pump 73 and condenses into water through the condensation tube 741, thus reducing the possibility of the water vapor escaping and scalding personnel. The water flowing from the condensation tube 741 passes through the second water circulation tube 743 into the first water circulation tube 71, and the top of the second water circulation tube 743 is provided with a vent hole 744 that can release gas. The desiccant in the connecting tube 75 absorbs the water vapor, which immediately enters the second vacuum pump 76, thus reducing the possibility of the water vapor condensing into water in the second vacuum pump 76. If the desiccant fails, the first filter element 751 can be removed to replace it. Summary of the operating principle:

[0035] As in the Fig. As shown in Figures 1-6, in cold weather the first vacuum pump 73 is switched off and the second vacuum pump 76 is switched on, and the second vacuum pump 76 pumps the water vapor into the steam condenser 70 to condense into a liquid which flows into the first water circulation pipe 71 to be reused; and at the same time the linear motor 242 is activated to drive the rack 243 and to set the spring 232 into vibration in order to vibrate and thus clean the filter mat fabric 231, and the dust falls out through the outlet groove 21.

[0036] Based on the apparatus of the present invention, exemplary embodiments of the present disclosure also provide a method of use for the apparatus of the present invention, comprising the following steps: Switching off the second vacuum pump 76 and switching on the first vacuum pump 73 when an ambient temperature exceeds a threshold during the power generation process of the geothermal carbon dioxide power generation device; Switching off the first vacuum pump 73 and switching on the second vacuum pump 76 when the ambient temperature is below a threshold value.

[0037] Although this disclosure has been described in detail with reference to the preceding embodiments, those skilled in the art should understand that they may nevertheless modify the technical solutions described in the preceding embodiments or replace some of the technical features with equivalent ones. However, these modifications or replacements do not cause the essence of the corresponding technical solution to depart from the spirit and scope of protection of the technical solutions of the embodiments of this disclosure.

Claims

[1] Geothermal carbon dioxide power generation device comprising a conduit (1) for transferring a geothermal medium to an evaporator (3), wherein the evaporator (3) converts the geothermal medium into steam and then drives a steam turbine (5) to rotate, the steam turbine (5) rotating to drive an electric generator (6) to generate electricity, characterized by , furthermore comprising a cooling mechanism (7) connected to the steam turbine (5), wherein the cooling mechanism (7) comprises the following: a steam condenser (70) provided on one side of the steam turbine, wherein a gas inlet of the steam condenser is connected to a gas outlet of the steam turbine, while a fluid outlet of the steam condenser is connected to the evaporator (3) via a first water circulation pipe (71), and while a gas outlet of the steam condenser is connected to an exhaust pipe (72), the exhaust pipe (72) being provided with a second vacuum pump (76) at an end facing away from the steam condenser (70); a first vacuum pump (73) provided on one side of the exhaust pipe (72), wherein a gas outlet of the first vacuum pump is connected to the first water circulation pipe (71) via a second water circulation pipe (743); wherein the power of the first vacuum pump (73) is greater than the power of the second vacuum pump (76). [2] Geothermal carbon dioxide power generation device according to claim 1, characterized by, that the second vacuum pump (76) and the exhaust pipe (72) are connected to each other by a connecting pipe (75), wherein an inner pipe diameter of the connecting pipe (75) is smaller than the inner pipe diameter of the exhaust pipe (72). [3] Geothermal carbon dioxide power generation device according to claim 2, characterized by , that the connecting pipe (75) is provided with a first filter element (751) and a desiccant, wherein the desiccant is provided on one side of the filter element (751) facing the second vacuum pump (76). [4] Geothermal carbon dioxide power generation device according to claim 1, characterized by , that a condensation tube (741) is provided at a connection point between the first vacuum pump (73) and the second water circulation tube (743), and wherein an inlet and an outlet of the condensation tube (741) are connected to the condenser (742). [5] Geothermal carbon dioxide power generation device according to claim 4, characterized by , that a vent hole (744) is provided on a surface of the second water circulation pipe (743). [6] Geothermal carbon dioxide power generation device according to claim 1, characterized by , that a filter mechanism (2) is provided between the conduit (1) and the evaporator (3), wherein the filter mechanism (2) comprises the following: a mounting frame (20) which is provided between the conduit (1) and the evaporator (3) and which has an outlet groove (21) on its underside; a mounting frame (230) which is provided within the mounting frame (20), wherein the mounting frame (230) is provided inside with a filter mat fabric (231). [7] Geothermal carbon dioxide power generation device according to claim 6, characterized by , that the mounting frame (230) is provided with a spring (232); wherein the filter mat fabric (231) is provided on one side with a mounting plate (240); wherein the mounting plate (240) is provided on a side facing the filter mat fabric (231) with a drive assembly (243), wherein a guide structure (244) is provided between the drive assembly (243) and the mounting plate (240), and wherein the guide structure (244) limits the drive assembly (243) so that it performs a linear back-and-forth movement in the horizontal direction; wherein, when the drive assembly (243) performs a back-and-forth movement in the horizontal direction, it sets the spring (232) into oscillation and thus collides with the filter mat fabric (231). [8] Geothermal carbon dioxide power generation device according to claim 7, characterized by, that the drive assembly (243) is provided on a side facing the filter mat fabric (231) with at least one projecting section; and wherein, when the drive assembly (243) performs a back-and-forth movement in a horizontal direction, a top surface of the projecting section periodically comes into contact with a spiral gap of the spring, causing the spring (232) to deform elastically and release, thereby colliding with the filter mat fabric (231). [9] Geothermal carbon dioxide power generation device according to claim 7, characterized by , that the mounting frame (20) is provided on the underside with an outlet groove (21), the outlet groove (21) being located below the filter mat fabric (231). [10] Geothermal carbon dioxide power generation device according to any one of the preceding claims, characterized by , that a control procedure is carried out with the following steps: Switching off the second vacuum pump (76) and switching on the first vacuum pump (73) when an ambient temperature exceeds a threshold during the power generation process of the geothermal carbon dioxide power generation device; Switching off the first vacuum pump (73) and switching on the second vacuum pump (76) when the ambient temperature is below a threshold value.

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