阅读说明：本技术 太阳能地热能联合驱动的跨临界二氧化碳发电系统及方法 (Transcritical carbon dioxide power generation system and method driven by solar energy and geothermal energy in combined mode ) 是由 廖胜明 杨雨缘 饶政华 于 2020-11-11 设计创作，主要内容包括：本发明公开了一种太阳能地热能联合驱动的跨临界二氧化碳发电系统及方法,该太阳能地热能联合驱动的跨临界二氧化碳发电系统包括太阳能子系统、地热能子系统和跨临界二氧化碳循环子系统,所述太阳能子系统通过太阳能加热器与跨临界二氧化碳循环子系统耦合连接,且该太阳能子系统通过换热器与所述地热能子系统耦合连接,所述地热能子系统通过地热能加热器以及低温回/加热器与所述跨临界二氧化碳循环子系统耦合连接；所述太阳能加热器上连接有第一控制阀组,所述换热器上连接有第二控制阀组,所述地热能加热器与换热器之间安装有第三控制阀组,以能够切换发电模式。本发明能够对太阳能与地热能的缺点进行互补,提高系统的运行效率、稳定性和经济性。(The invention discloses a trans-critical carbon dioxide power generation system and method driven by solar energy and geothermal energy in a combined manner, wherein the trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined manner comprises a solar subsystem, a geothermal energy subsystem and a trans-critical carbon dioxide circulation subsystem, the solar subsystem is coupled with the trans-critical carbon dioxide circulation subsystem through a solar heater, the solar subsystem is coupled with the geothermal energy subsystem through a heat exchanger, and the geothermal energy subsystem is coupled with the trans-critical carbon dioxide circulation subsystem through a geothermal energy heater and a low-temperature return/heater; the solar energy heating device is characterized in that a first control valve group is connected to the solar energy heater, a second control valve group is connected to the heat exchanger, and a third control valve group is installed between the geothermal energy heater and the heat exchanger to switch power generation modes. The invention can complement the defects of solar energy and geothermal energy, and improves the operation efficiency, stability and economy of the system.)

1. A transcritical carbon dioxide power generation system driven by solar energy and geothermal energy jointly comprises a solar subsystem, a geothermal energy subsystem and a transcritical carbon dioxide circulation subsystem, wherein the solar subsystem is coupled with the transcritical carbon dioxide circulation subsystem through a solar heater (1), the solar subsystem is coupled with the geothermal energy subsystem through a heat exchanger (2), and the geothermal energy subsystem is coupled with the transcritical carbon dioxide circulation subsystem through a geothermal energy heater (3) and a low temperature return/heater (4); the solar energy heating system is characterized in that a first control valve group is connected to the solar heater (1), a second control valve group is connected to the heat exchanger (2), and a third control valve group is installed between the geothermal energy heater (3) and the heat exchanger (2) to switch power generation modes.

2. The solar-geothermal energy jointly driven transcritical carbon dioxide power generating system according to claim 1, wherein the solar subsystem comprises a solar circulation loop (51), on which solar collector (52), collection circulation pump (53), solar heater (1) and heat exchanger (2) are arranged on the solar circulation loop (51).

3. The transcritical carbon dioxide power generation system driven by solar and geothermal energy in combination according to claim 2, wherein the first control valve group comprises a first bypass branch (61) connected with the solar heater (1) in parallel and a first control valve (62) installed on at least one of the two end pipes of the solar heater (1), the first bypass branch (61) is provided with a first bypass valve (63), and the first control valve (62) is located between the solar heater (1) and the first bypass branch (61); the second control valve group comprises a second bypass branch (64) connected with the heat exchanger (2) in parallel and a second control valve (65) installed on at least one end pipeline in pipelines at two ends of the heat exchanger (2), a second bypass valve (66) is arranged on the second bypass branch (64), and the second control valve (65) is located between the heat exchanger (2) and the second bypass branch (64).

4. The solar-geothermal energy co-driven transcritical carbon dioxide power generation system according to claim 2 or 3, wherein the solar subsystem further comprises a heat storage subsystem (54), the heat storage subsystem (54) being connected in parallel with the solar collector (52).

5. The transcritical carbon dioxide power generation system driven by solar and geothermal energy in a combined manner according to any one of claims 1 to 3, wherein the geothermal energy subsystem comprises a first branch (71) and a second branch (72), the geothermal energy heater (3) is mounted on the first branch (71), one end of the first branch (71) is connected with a pumping well (73) through the heat exchanger (2), and the other end of the first branch (71) is connected with a recharging well (74) through the low temperature return/heater (4); one end of the second branch (72) is connected with the pumping well (73) through the heat exchanger (2), and the other end of the second branch is connected with the recharging well (74) through the low-temperature return/heater (4).

6. The solar-geothermal energy combined drive transcritical carbon dioxide power generation system according to claim 5, wherein the third control valve group comprises a third control valve (67) mounted on at least one of the two end pipes of the geothermal energy heater (3) and a fourth control valve (68) mounted on the second branch pipe (72).

7. The solar-geothermal energy combined-drive transcritical carbon dioxide power generation system according to any one of claims 1-3, wherein the transcritical carbon dioxide recycling sub-system comprises a transcritical carbon dioxide recycling loop (81), the solar heater (1), the geothermal energy heater (3), the low temperature return/heater (4), a power recycling pump (82), a condenser (83) and a turbine (85) connected with a generator (84) being arranged on the transcritical carbon dioxide recycling loop (81).

8. A trans-critical carbon dioxide power generation method driven by solar energy and geothermal energy in a combined mode is characterized in that the trans-critical carbon dioxide power generation method based on the solar energy and geothermal energy in the combined mode according to any one of claims 1 to 7 comprises the following steps:

starting control: detecting geothermal energy temperature T_geothermalAnd evaluating the inlet temperature T of the solar heater (1)_solarIf the condition "T" is_geothermal>T_{geothermal_min}'OR' T_solar>T_{solar_start2}If yes, starting the whole power plant system, otherwise, keeping the power plant system closed;

and (3) operation control: at power plant system startup, when condition "T_solar≤T_{solar_normal}If "true, then the condition" T "is determined_{solar_min}＜T_solar≤T_{solar_normal}- Δ T1 "or" T_geothermal＞T_{geothermal_min}If yes, entering a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem, and otherwise, entering a coupling operation mode of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem; when the condition "T_solar>T_{solar_normal}If yes, the heat enters a geothermal energy subsystem, a solar energy subsystem and transcritical oxidationThe carbon circulation subsystem is coupled with the running mode to continuously judge the condition T_solar>T_{solar_storage}"if true, if false, judge condition" T_{solar_check}-T_geothermalWhether the temperature is more than or equal to delta T2' or not is judged, if not, the coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is kept, otherwise, the deep coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is entered;

wherein, T_{geothermal_min}Represents the lower temperature limit, T, of geothermal resources suitable as a sole heat source for cyclic heating power generation_{solar_start2}Lower limit of solar temperature, T, representing mode of operation of system suitable for coupling geothermal energy subsystem with solar energy subsystem_{solar_normal}Represents the lower temperature limit, T, at which the solar resource is suitable for direct use as a circulating heat source_{solar_min}The lower temperature limit of the solar subsystem is shown, and the temperature upper limit and the temperature T of the judgment condition are shown by delta T1_{solar_normal}Temperature difference constant of (T)_{solar_storage}Indicating a lower temperature limit, T, for normal operation of the heat storage subsystem_{solar_check}Representing the solar heat exchanger outlet temperature, Δ T2 representing T_{solar_check}And T_geothermalIs constant.

9. The method of claim 8, wherein the start-up control is performed under a condition "T" in the case of a combined solar-geothermal power generation_geothermal≤T_{geothermal_min}And T_solar>T_{solar_start2}If yes, entering a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem to complete the starting of the whole power plant system; if the condition "T_geothermal>T_{geothermal_min}And T_solar>T_{solar_start2}'OR' T_geothermal>T_{geothermal_min}And T_solar≤T_{solar_start2}And if yes, entering a coupling operation mode of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem to complete the starting of the whole power plant system.

10. The method of claim 8, wherein the condition "T" is a condition "T" for generating transcritical carbon dioxide_solar>T_{solar_storage}And if yes, storing the redundant heat of the solar subsystem.

Technical Field

The invention relates to a mixed power generation system based on transcritical carbon dioxide, in particular to a transcritical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined mode; in addition, the method also relates to a trans-critical carbon dioxide power generation method driven by solar energy and geothermal energy in a combined mode.

Background

At present, as the continuous development of human civilization has great demand on energy, fossil energy is developed and used in large quantities all the time, so that the problems of severe environment, energy crisis and the like occur, and the research of clean and renewable green new energy becomes an energy strategy of countries in the world. Solar energy and geothermal energy are used as members of a new energy family, and have defects caused by the characteristics of some resources, so that the development and the utilization of the solar energy and the geothermal energy have some problems.

The geothermal energy power generation has good stability and is not easily influenced by external conditions, but the temperature of the geothermal fluid is generally low, and the heat efficiency of a system which is independently utilized are as high as those of the geothermal fluidThe efficiency is not high, the requirement on site selection is high, and the initial investment cost is high; although the solar energy is widely distributed and the site selection requirement is relatively low, the temperature range which can be reached according to the difference of system forms and regional resources is also wide, but the solar energy is easily influenced by external conditions, the system is very unstable in operation and high in fluctuation, and the initial investment of the system is also high.

In addition, most systems currently employ organic rankine cycles for the utilization of medium and low temperature heat sources. Compared with a steam Rankine cycle, the organic Rankine cycle system has higher efficiency and simpler components, and system equipment can realize standard modular production, but organic working media have certain pollution hidden trouble, and the phase change is easy to cause the problem of pinch points in the heat absorption process (the pinch point problem means that in a heat exchanger, because the difference of the heat capacity flow rate of fluid at the cold side is large, the temperature change trends are different, so that the minimum temperature difference point of the heat exchanger appears in the heat exchanger instead of two ends, the heat transfer is deteriorated), and the heat source temperature change can not be well matched.

In view of the above, a novel trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy jointly needs to be designed.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined manner, and the trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined manner can complement the defects of solar energy and geothermal energy, so that the operation efficiency, stability and economy of the system are improved.

The invention further aims to solve the technical problem of providing a trans-critical carbon dioxide power generation method driven by solar energy and geothermal energy in a combined manner, wherein the trans-critical carbon dioxide power generation method driven by solar energy and geothermal energy in a combined manner can complement the defects of solar energy and geothermal energy, and the operation efficiency, stability and economy of a system are improved.

In order to solve the technical problems, the invention provides a trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined mode, which comprises a solar subsystem, a geothermal energy subsystem and a trans-critical carbon dioxide circulation subsystem, wherein the solar subsystem is coupled with the trans-critical carbon dioxide circulation subsystem through a solar heater, the solar subsystem is coupled with the geothermal energy subsystem through a heat exchanger, and the geothermal energy subsystem is coupled with the trans-critical carbon dioxide circulation subsystem through a geothermal energy heater and a low-temperature return/heater; the solar energy heating device is characterized in that a first control valve group is connected to the solar energy heater, a second control valve group is connected to the heat exchanger, and a third control valve group is installed between the geothermal energy heater and the heat exchanger to switch power generation modes.

Preferably, the solar subsystem comprises a solar circulation loop, and a solar heat collector, a heat collection circulation pump, the solar heater and the heat exchanger are arranged on the solar circulation loop.

Further preferably, the first control valve group comprises a first bypass branch connected in parallel with the solar heater and a first control valve installed on a pipeline at least at one end of pipelines at two ends of the solar heater, the first bypass branch is provided with a first bypass valve, and the first control valve is located between the solar heater and the first bypass branch; the second control valve group comprises a second bypass branch connected with the heat exchanger in parallel and a second control valve arranged on at least one end pipeline of pipelines at two ends of the heat exchanger, a second bypass valve is arranged on the second bypass branch, and the second control valve is positioned between the heat exchanger and the second bypass branch.

Specifically, the solar subsystem further comprises a heat storage subsystem, and the heat storage subsystem is connected with the solar heat collector in parallel.

Preferably, the geothermal energy subsystem comprises a first branch and a second branch, the geothermal energy heater is installed on the first branch, one end of the first branch is connected with the pumping well through the heat exchanger, and the other end of the first branch is connected with the recharging well through the low-temperature return/heater; one end of the second branch is connected with the pumping well through the heat exchanger, and the other end of the second branch is connected with the recharging well through the low-temperature return/heater.

Preferably, the third control valve group comprises a third control valve installed on at least one of the pipelines at the two ends of the geothermal energy heater and a fourth control valve installed on the second branch line.

Specifically, the transcritical carbon dioxide recycling sub-system includes a transcritical carbon dioxide recycling loop having the solar heater, the geothermal energy heater, the low temperature return/heater, a power circulation pump, a condenser, and a turbine connected to a generator disposed thereon.

The invention also discloses a trans-critical carbon dioxide power generation method driven by solar energy and geothermal energy jointly, which is based on any one of the technical schemes and comprises the following steps: starting control: detecting geothermal energy temperature T_geothermalAnd evaluating the solar heater inlet temperature T_solarIf the condition "T" is_geothermal>T_{geothermal_min}'OR' T_solar>T_{solar_start2}If yes, starting the whole power plant system, otherwise, keeping the power plant system closed; and (3) operation control: at power plant system startup, when condition "T_solar≤T_{solar_normal}If "true, then the condition" T "is determined_{solar_min}＜T_solar≤T_{solar_normal}- Δ T1 "or" T_geothermal＞T_{geothermal_min}If yes, entering a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem, and otherwise, entering a coupling operation mode of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem; when the condition "T_solar>T_{solar_normal}If yes, the system enters a coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem, and the condition T is continuously judged_solar>T_{solar_storage}"if true, if false, judge condition" T_{solar_check}-T_geothermalWhether the temperature is more than or equal to delta T2' or not is judged, if not, the coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is kept, otherwise, the deep coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is entered; wherein, T_{geothermal_min}Represents the lower temperature limit, T, of geothermal resources suitable as a sole heat source for cyclic heating power generation_{solar_start2}Lower limit of solar temperature, T, representing mode of operation of system suitable for coupling geothermal energy subsystem with solar energy subsystem_{solar_normal}Represents the lower temperature limit, T, at which the solar resource is suitable for direct use as a circulating heat source_{solar_min}The lower temperature limit of the solar subsystem is shown, and the temperature upper limit and the temperature T of the judgment condition are shown by delta T1_{solar_normal}Temperature difference constant of (T)_{solar_storage}Indicating a lower temperature limit, T, for normal operation of the heat storage subsystem_{solar_check}Representing the solar heat exchanger outlet temperature, Δ T2 representing T_{solar_check}And T_geothermalIs constant.

Preferably, in the start-up control, if the condition "T" is_geothermal≤T_{geothermal_min}And T_solar>T_{solar_start2}Entering a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem to complete the starting of the whole power plant system; if the condition "T_geothermal>T_{geothermal_min}And T_solar>T_{solar_start2}'OR' T_geothermal>T_{geothermal_min}And T_solar≤T_{solar_start2}And if yes, entering a coupling operation mode of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem to complete the starting of the whole power plant system.

Preferably, if the condition "T" is_solar>T_{solar_storage}And if yes, storing the redundant heat of the solar subsystem.

Through the technical scheme, the invention has the following beneficial effects:

according to the solar energy and geothermal energy combined power generation system, the power generation modes can be switched through the first control valve group, the second control valve group and the third control valve group, so that the combined power generation of solar energy and geothermal energy is realized; compared with the existing single geothermal power generation system and single solar power generation system, the system has higher power generation efficiency and higher system operation stability; the power load in the daytime is usually higher than that in the nighttime, which is exactly consistent with the power output variation trend of the trans-critical carbon dioxide power generation system driven by the solar energy and geothermal energy in a combined mode, more power resources are output in the period of high power demand, and the power demand response performance is excellent; because the solar subsystem, the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem are coupled, the solar power generation system and the geothermal energy power generation system share one set of circulation power generation system, and land resources are saved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The following drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the scope of the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a transcritical carbon dioxide power generation system driven by solar and geothermal energy in combination according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating the start-up control in the method for generating transcritical carbon dioxide by combined solar and geothermal power according to an embodiment of the present invention;

FIG. 3 is a flow chart of the operation control in the method for generating transcritical carbon dioxide by combined solar and geothermal power according to the embodiment of the present invention;

FIG. 4 is a block flow diagram of a method for generating transcritical carbon dioxide by combined solar and geothermal power, according to an embodiment of the present invention.

Description of the reference numerals

1 solar heater 2 Heat exchanger

3 geothermal energy heater 4 low temperature return/heater

51 solar energy circulation loop 52 solar energy heat collector

53 heat collection circulating pump 54 heat storage subsystem

61 first bypass branch 62 first control valve

63 first bypass valve 64 second bypass branch

65 second control valve 66 second bypass valve

67 third control valve 68 fourth control valve

71 first branch 72 and second branch

73 pumping well 74 recharging well

81 trans-critical carbon dioxide circulation loop 82 power circulation pump

83 condenser 84 generator

85 turbine

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation and is not intended to limit the scope of the invention.

Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features described.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, the transcritical carbon dioxide power generation system driven by solar energy and geothermal energy in a combined mode according to the basic embodiment of the present invention comprises a solar subsystem, a geothermal energy subsystem and a transcritical carbon dioxide circulation subsystem, wherein the solar subsystem is coupled with the transcritical carbon dioxide circulation subsystem through a solar heater 1, the solar subsystem is coupled with the geothermal energy subsystem through a heat exchanger 2, and the geothermal energy subsystem is coupled with the transcritical carbon dioxide circulation subsystem through a geothermal energy heater 3 and a low temperature return/heater 4; the solar energy heating system is characterized in that a first control valve group is connected to the solar heater 1, a second control valve group is connected to the heat exchanger 2, and a third control valve group is installed between the geothermal energy heating system 3 and the heat exchanger 2 so as to switch power generation modes.

The invention couples and connects the solar energy subsystem with the transcritical carbon dioxide circulation subsystem through the solar heater 1, the solar energy subsystem is coupled and connected with the geothermal energy subsystem through the heat exchanger 2, the geothermal energy subsystem is coupled and connected with the transcritical carbon dioxide circulation subsystem through the geothermal energy heater 3 and the low temperature return/heater 4, and jointly form the combined power generation system, compared with the existing single geothermal power generation system and single solar energy power generation system, the system has higher power generation efficiency and higher operation stability, wherein, the 'coupling' means that the subsystems have shared and interactive parts, for example, the coupling and connection of the solar energy subsystem with the transcritical carbon dioxide circulation subsystem through the solar heater 1 means that the solar energy subsystem and the transcritical carbon dioxide circulation subsystem are connected at two sides of the solar heater 1, and both share the solar heater 1, and, interaction is performed by the solar heater 1. Particularly, a first control valve group is connected on the solar heater 1, a second control valve group is connected on the heat exchanger 2, a third control valve group is installed between the geothermal energy heater 3 and the heat exchanger 2, and the power generation modes can be switched by the control of the first control valve group, the second control valve group and the third control valve group, for example, different power generation modes such as a coupling operation mode of a geothermal energy subsystem and a solar energy subsystem, a coupling operation mode of the geothermal energy subsystem and a transcritical carbon dioxide circulation subsystem, a coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem, a deep coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem, and the like can well utilize solar energy and geothermal energy as heat sources to generate power in various power generation modes, usually, the power load in the daytime is usually higher than the power load at night, the power output variation trend of the trans-critical carbon dioxide power generation system driven by the solar energy and geothermal energy is exactly the same as that of the trans-critical carbon dioxide power generation system driven by the solar energy and geothermal energy, so that the intermittent influence is reduced to the greatest extent, and the user load is better matched; and the solar energy and geothermal energy power generation system share one set of circulating power generation system, and the system collects energy above the ground and below the ground simultaneously during working, so that land resources are saved.

In the specific embodiment, the solar subsystem comprises a solar circulation loop 51, and a solar heat collector 52, a heat collection circulation pump 53, a solar heater 1 and a heat exchanger 2 are arranged on the solar circulation loop 51, so that under the action of the heat collection circulation pump 53, a heat collection working medium enters the solar heat collector 52 to collect solar energy and raise the temperature, supplies heat to the transcritical carbon dioxide circulation subsystem when passing through the solar heater 1, and supplies heat to the geothermal energy subsystem when passing through the heat exchanger 2. In order to better match the lower temperature geothermal energy, the solar collector 52 may be a trough collector with a working range in the middle-high range.

Further, a heat storage subsystem 54 is further arranged in the solar subsystem, the heat storage subsystem 54 is connected with the solar heat collector 52 in parallel, when the solar energy has surplus besides supplying heat to the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem, the surplus heat energy is stored in the heat storage subsystem 54, and the heat storage subsystem 54 can adopt the existing sensible heat energy storage technology.

In another embodiment, the geothermal energy subsystem comprises a first branch 71 and a second branch 72, the geothermal energy heater 3 is arranged on the first branch 71, so that the geothermal energy subsystem can supply heat to the transcritical carbon dioxide circulation subsystem through the action of the geothermal energy heater 3; one end of the first branch 71 is connected with the pumping well 73 through the heat exchanger 2, the other end of the first branch 71 is connected with the recharging well 74 through the low-temperature return/heater 4, meanwhile, one end of the second branch 72 is connected with the pumping well 73 through the heat exchanger 2, and the other end of the second branch 72 is connected with the recharging well 74 through the low-temperature return/heater 4; according to different power generation modes, the heat transfer working medium output from the pumping well 73 can selectively supply heat to the transcritical carbon dioxide circulation subsystem through the first branch circuit 71 or the second branch circuit 72 and then flows back to the recharging well 74.

A first control valve group is connected to the solar heater 1, a second control valve group is connected to the heat exchanger 2, and a third control valve group is installed between the geothermal energy heater 3 and the heat exchanger 2; specifically, the first control valve group includes a first bypass branch 61 and a first control valve 62, as required, the first control valve 62 may be installed on a pipeline at one end of the solar heater 1, or the first control valves 62 may be installed on pipelines at two ends of the solar heater 1, two ends of the first bypass branch 61 are respectively connected with pipelines at two ends of the solar heater 1, the first control valve 62 is located on a pipeline between the solar heater 1 and a connection point between the end of the solar heater 1 and the first bypass branch 61, and the first bypass branch 61 is provided with a first bypass valve 63; similarly, the second control valve group comprises a second bypass branch 64 and a second control valve 65, as required, the second control valve 65 may be installed on a pipeline at one end of the heat exchanger 2, or the second control valves 65 may be installed on pipelines at two ends of the heat exchanger 2, two ends of the second bypass branch 64 are connected with pipelines at two ends of the heat exchanger 2, the second control valve 65 is located on a pipeline between the heat exchanger 2 and a connection point between the end of the heat exchanger 2 and the second bypass branch 64, and the second bypass branch 64 is provided with a second bypass valve 66; the third control valve group comprises a third control valve 67 and a fourth control valve 68, the third control valve 67 can be arranged on a pipeline between the heat exchanger 2 and the geothermal energy heater 3, or can be arranged on a pipeline between the geothermal energy heater 3 and the low temperature return/heater 4, or can be respectively arranged on a pipeline between the heat exchanger 2 and the geothermal energy heater 3 and a pipeline between the geothermal energy heater 3 and the low temperature return/heater 4, and the fourth control valve 68 is arranged on the second branch 72.

Therefore, different power generation modes can be entered through switching of the first control valve group, the second control valve group and the third control valve group. Specifically, when the first bypass valve 63, the second bypass valve 66 and the third control valve 67 are opened, the operation mode (mode 1) of coupling the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem is entered, the solar energy subsystem is temporarily in an isolated state, and the heat collection working medium in the solar energy subsystem cannot flow through the solar heater 1 and the heat exchanger 2; after passing through the heat exchanger 2, the heat transfer working medium extracted from the pumping well 73 flows through the geothermal energy heater 3 along the first branch 71 and then flows back into the recharging well 74 through the low temperature return/heater 4, heat is supplied to the transcritical carbon dioxide circulating subsystem through the geothermal energy heater 3 and the low temperature return/heater 4, the carbon dioxide working medium in the transcritical carbon dioxide circulating subsystem is heated and then enters the turbine 85 to do work, a power generation circulating process is completed, after the work is done, the carbon dioxide working medium enters the low temperature return/heater 4 to heat the lower temperature carbon dioxide working medium on the other side, and the heat returning function is realized, namely, the low temperature return/heater 4 has double functions of heating and heat returning; the mode only uses geothermal energy as a circulating heat source, and is usually adopted under the conditions that available solar energy resources are very deficient and geothermal energy resources reach certain temperature requirements; when the first bypass valve 63, the second control valve 65 and the third control valve 67 are opened, the operation mode (mode 2) of coupling the geothermal energy subsystem and the solar energy subsystem is entered, the heat collecting working medium in the solar energy subsystem does not flow through the solar heater 1 and directly heats the transcritical carbon dioxide circulation subsystem, the heat collecting working medium in the solar energy subsystem flows through the heat exchanger 2 through the second control valve 65, heat is supplied to the geothermal energy subsystem through the heat exchanger 2, the heat transfer working medium in the geothermal energy subsystem is heated, the temperature of the heat transfer working medium in the geothermal energy subsystem is increased, the heat transfer working medium extracted from the pumping well 73 is heated by the heat exchanger 2, flows through the geothermal energy heater 3 along the first branch 71, then flows back to the recharging well 74 through the low temperature return/heater 4, and supplies heat to the transcritical carbon dioxide circulation subsystem through the geothermal energy heater 3 and the low temperature return/heater 4, the carbon dioxide working medium in the transcritical carbon dioxide circulation subsystem is heated and then enters the turbine 85 to do work, and a primary power generation circulation process is completed; in the mode, available solar energy resources are slightly deficient, solar energy heats geothermal energy through the heat exchanger, the energy utilization grade of the geothermal energy is improved, and the mode has low requirement on the temperature of the geothermal energy resources; when the first control valve 62, the second bypass valve 66 and the fourth control valve 68 are opened, the operation mode (mode 3) of coupling the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is entered, the heat collecting working medium in the solar energy subsystem flows through the solar heater 1, heat is supplied to the transcritical carbon dioxide circulation subsystem, the heat transfer working medium in the geothermal energy subsystem is output from the pumping well 73 and passes through the heat exchanger 2, flows back into the recharge well 74 after passing through the low temperature return/heater 4 along the second branch 72, the low-temperature return/heater 4 supplies heat to the transcritical carbon dioxide circulation subsystem, the solar subsystem and the geothermal energy subsystem respectively heat carbon dioxide working media in the transcritical carbon dioxide circulation subsystem, and then the carbon dioxide working media enter the turbine 85 to do work to complete a power generation circulation process; in the mode, available solar energy resources are sufficient, solar energy and geothermal energy are respectively used as a high-temperature heat source and a low-temperature heat source of the transcritical carbon dioxide circulation subsystem, and the mode has low requirement on the temperature of geothermal resources; when the first control valve 62, the second control valve 65 and the fourth control valve 68 are opened, the system enters a deep coupling operation mode (mode 4) of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem, in the mode, heat collection working media in the solar energy subsystem sequentially flow through the solar heater 1 and the heat exchanger 2, the transcritical carbon dioxide circulation subsystem can be heated by the solar heater 1, heat transfer working media in the geothermal energy subsystem are heated by the heat exchanger 2, the energy utilization grade of geothermal energy is improved, the heat transfer working media in the geothermal energy subsystem are output from the pumping well 73, after passing through the heat exchanger 2, flow back to the recharging well 74 along the second branch 72 after passing through the low-temperature return/heater 4, heat is supplied to the transcritical carbon dioxide circulation subsystem by the low-temperature return/heater 4, and the carbon dioxide working media in the transcritical carbon dioxide circulation subsystem enter the turbine 85 to perform functions, completing a power generation cycle process; in the mode, available solar energy resources are quite sufficient, solar energy and geothermal energy heated by the solar energy are respectively used as a high-temperature heat source and a low-temperature heat source of the transcritical carbon dioxide circulation subsystem, and the mode has low requirements on the temperature of the geothermal energy resources. Wherein, the heat collection working medium and the heat transfer working medium can adopt heat transfer media such as water and the like.

In a specific example, the transcritical carbon dioxide recycling sub-system comprises a transcritical carbon dioxide recycling loop 81, the solar heater 1, the geothermal energy heater 3, the low temperature return/heater 4, the power circulating pump 82, the condenser 83 and the turbine 85 are arranged on the transcritical carbon dioxide recycling loop 81, and the generator 84 is connected to the turbine 85. After the carbon dioxide working medium in the transcritical carbon dioxide circulation subsystem is heated by the solar energy subsystem through the solar heater 1 and the carbon dioxide working medium in the transcritical carbon dioxide circulation subsystem is heated by the geothermal energy subsystem through the geothermal energy heater 3 and the low temperature return/heater 4, the carbon dioxide working medium flows into the turbine 85 to do work under the push of the power circulation pump 82, the generator 84 is driven to generate electricity, the carbon dioxide working medium flowing out of the turbine 85 flows through the low temperature return/heater 4 and flows to the condenser 83 along the heat return channel in the low temperature return/heater 4 to heat the low temperature carbon dioxide working medium flowing through the fluid channel (heated channel) in the low temperature return/heater 4, the condenser 83 cools and condenses the carbon dioxide working medium to form liquid, the pressure is increased through the power circulation pump 82, the pressurized carbon dioxide working medium enters a fluid channel (heated channel) in the low-temperature return/heater 4, is heated by the high-temperature carbon dioxide working medium flowing through the heat return channel in the low-temperature return/heater 4 to perform a heat return process on one hand, and is heated by the heat transfer working medium in the geothermal energy subsystem flowing through the heating channel in the low-temperature return/heater 4 on the other hand, and is further heated by the geothermal energy heater 3 and the solar heater 1 to enter a turbine 85 to do work, so that a power generation cycle is completed.

In order to facilitate understanding of the technical concept and advantages of the solar-geothermal energy combined-driven transcritical carbon dioxide power generation system of the present invention, a structural form of the solar-geothermal energy combined-driven transcritical carbon dioxide power generation system of the present invention, which is relatively comprehensive in preferred features, will be described below.

As shown in fig. 1, the transcritical carbon dioxide power generation system driven by solar energy and geothermal energy in combination according to the preferred embodiment of the present invention includes a solar subsystem, a geothermal energy subsystem and a transcritical carbon dioxide circulation subsystem; the solar subsystem comprises a solar circulation loop 51, a solar heat collector 52, a heat collection circulation pump 53, a heat storage subsystem 54, a solar heater 1 and a heat exchanger 2 are arranged on the solar circulation loop 51, the heat storage subsystem 54 is connected to two ends of the solar heat collector 52 in parallel, two ends of the solar heater 1 are connected with a first bypass branch 61 in parallel, a first bypass valve 63 is arranged on the first bypass branch 61, a first control valve 62 is arranged on a pipeline at two ends of the solar heater 1, and the solar subsystem is coupled and connected with the transcritical carbon dioxide circulation subsystem through the solar heater 1; the transcritical carbon dioxide circulating subsystem comprises a transcritical carbon dioxide circulating loop 81, a solar heater 1, a geothermal energy heater 3, a low-temperature return/heater 4, a power circulating pump 82, a condenser 83 and a turbine 85 are arranged on the transcritical carbon dioxide circulating loop 81, the turbine 85 is connected with a generator 84, and the transcritical carbon dioxide circulating subsystem is coupled with the geothermal energy subsystem through the geothermal energy heater 3 and the low-temperature return/heater 4; the geothermal energy subsystem comprises a first branch 71 and a second branch 72, the geothermal energy heater 3 is arranged on the first branch 71, third control valves 67 are respectively installed on pipelines at two ends of the geothermal energy heater 3, one end of the first branch 71 is connected with a pumping well 73 through a heat exchanger 2, the other end of the first branch is connected with a recharging well 74 through a low-temperature returning/heating device 4, a fourth control valve 68 is installed on the second branch 72, one end of the second branch 72 is connected with the pumping well 73 through the heat exchanger 2, and the other end of the second branch 72 is connected with the recharging well 74 through the low-temperature returning/heating device 4. The valves such as the first control valve 62, the first bypass valve 63, the second control valve 65, the second bypass valve 66, the third control valve 67, and the fourth control valve 68 may be valves capable of controlling the on/off of fluid, such as on/off valves.

Through the control of nine valves such as the two first control valves 62, the first bypass valve 63, the two second control valves 65, the second bypass valve 66, the two third control valves 67 and the fourth control valve 68, the power generation mode can be switched to different power generation modes for power generation, the combined power generation of solar energy and geothermal energy is realized, the intermittent influence is reduced to the maximum extent, the user load is better matched, the change trend of the power load is consistent with that of the power load of the common day higher than that of the night, and more power resources can be output in the peak period of power demand relative to a single power generation system; meanwhile, the instability of a single solar power generation system can be overcome, the geothermal energy can be used for passing through the insufficient period of solar energy resources, and to a certain extent, the geothermal energy can also store a part of solar energy to enter a reservoir stratum, so that the energy utilization grade of the geothermal energy is improved, and the system has high power generation efficiency and high operation stability. In addition, the adopted carbon dioxide working medium has good stability, no toxicity, no corrosiveness, no irritation and no flammability; the environment-friendly performance is excellent, the ozone consumption potential (representing the relative capacity of chlorofluorocarbons in the atmosphere to ozone damage) for 100 years is 0, and the global warming potential (the index of greenhouse effect generated by substances) is 1; the price is low and the product is easy to obtain; the density is high, thereby being beneficial to reducing the volume of equipment; the heat exchange performance is excellent, and the compression work of the compressor working near a critical point is small; the critical temperature is low, the critical pressure is moderate, and the supercritical working condition is easy to implement.

To further understand the technical concepts and advantages of the present invention, the transcritical carbon dioxide power generation method of the present invention driven by solar-geothermal energy is described below.

As shown in fig. 2 to 4, the transcritical carbon dioxide power generation method driven by solar energy and geothermal energy comprises the following steps:

starting control: detecting geothermal energy temperature T_geothermalAnd evaluating the inlet temperature T of the solar heater 1_solarIf the condition "T" is_geothermal>T_{geothermal_min}'OR' T_solar>T_{solar_start2}If not, the power plant system is kept closed;

and (3) operation control: at power plant system startup, when condition "T_solar≤T_{solar_normal}If "true, then the condition" T "is determined_{solar_min}＜T_solar≤T_{solar_normal}- Δ T1 "or" T_geothermal＞T_{geothermal_min}If yes, entering a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem, and otherwise, entering a coupling operation mode of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem; when the condition "T_solar>T_{solar_normal}Entering a coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem, and continuously judging the condition T_solar>T_{solar_storage}"if true, if false, judge condition" T_{solar_check}-T_geothermalWhether the temperature is more than or equal to delta T2' or not is judged, if not, the coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is kept, otherwise, the deep coupling operation mode of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is entered;

wherein, T_{geothermal_min}Represents the lower temperature limit, T, of geothermal resources suitable as a sole heat source for cyclic heating power generation_{solar_start2}Lower limit of solar temperature, T, representing mode of operation of system suitable for coupling geothermal energy subsystem with solar energy subsystem_{solar_normal}Represents the lower temperature limit, T, at which the solar resource is suitable for direct use as a circulating heat source_{solar_min}The lower temperature limit of the solar subsystem is shown, and the temperature upper limit and the temperature T of the judgment condition are shown by delta T1_{solar_normal}Temperature difference constant of (T)_{solar_storage}Indicating a lower temperature limit, T, for normal operation of the heat storage subsystem_{solar_check}Representing the solar heat exchanger outlet temperature, Δ T2 representing T_{solar_check}And T_geothermalIs constant.

In the startup control, if the condition "T" is_geothermal≤T_{geothermal_min}And T_solar>T_{solar_start2}Entering a coupling operation mode (mode 2) of the geothermal energy subsystem and the solar energy subsystem to complete the starting of the whole power plant system; if the condition "T_geothermal>T_{geothermal_min}And T_solar>T_{solar_start2}'OR' T_geothermal>T_{geothermal_min}And T_solar≤T_{solar_start2}And entering a coupling operation mode (mode 1) of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem to complete the starting of the whole power plant system.

Switching the power generation mode according to the conditions of different solar energy resources and geothermal energy resources; when a power plant system is started, the inlet temperature T of the solar heater 1 needs to be adjusted according to external factors such as future weather conditions, ambient temperature and the like_solarPerforming certain evaluation and detecting the geothermal energy temperature T_geothermalI.e. the outlet temperature of the pumping well 73, if "T_geothermal>T_{geothermal_min}'OR' T_solar>T_{solar_start2}If not, the power plant system is kept closed.

After the normal start is finished, entering the system operation; first, it is judgedCondition "T_solar>T_{solar_normal}If the condition is not satisfied, it indicates that the solar energy resource is slightly deficient or very deficient, and is not suitable for being directly used as a high-temperature heat source for heat supply, and further determines the condition T_{solar_min}＜T_solar≤T_{solar_normal}- Δ T1 "or" T_geothermal＞T_{geothermal_min}If yes, opening the first bypass valve 63, the second control valve 65 and the third control valve 67, closing the other valves, and entering a coupling operation mode (mode 2) of the geothermal energy subsystem and the solar energy subsystem, wherein the solar energy heats the geothermal energy through the heat exchanger 2, so that the energy utilization grade of the geothermal energy is improved, and the requirement on the temperature of the geothermal resources is not high; if the conditions are not met, opening the first bypass valve 63, the second bypass valve 66 and the third control valve 67, and closing the other valves to indicate that the solar energy resources are very deficient, entering a coupling operation mode (mode 1) of the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem, only using geothermal energy as a heat source, and adopting the geothermal energy resources under the condition that the geothermal energy resources meet certain temperature requirements; if the condition "T_solar>T_{solar_normal}If the solar energy is sufficient or very sufficient, the system can enter a geothermal energy subsystem, a solar energy subsystem and a transcritical carbon dioxide circulation subsystem coupling operation mode (mode 3) when the first control valve 62, the second bypass valve 66 and the fourth control valve 68 are opened, the solar energy and the geothermal energy are respectively used as a high-temperature heat source and a low-temperature heat source of the transcritical carbon dioxide circulation subsystem, and the mode has low requirements on the temperature of the geothermal energy; re-judgment condition "T_solar>T_{solar_storage}If the conditions are met, the solar energy resources are surplus, the heat storage subsystem 54 can be started to store surplus heat, if the conditions are not met, the solar energy resources are not surplus, the solar energy subsystems can only be operated to collect heat, and the heat storage subsystem 54 is kept closed; continuously judging condition "T_{solar_check}-T_geothermal≥ΔT₂If the conditions are not met, the solar energy resource is sufficient, and the coupling of the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is continuously keptAnd (3) combining the operation mode (mode 3), if the conditions are met, the solar energy resource is very sufficient, the temperature of the heat collection working medium is higher after the heat collection working medium heats the carbon dioxide working medium, the energy grade of the geothermal energy is improved to a certain degree, the first control valve 62, the second control valve 65 and the fourth control valve 68 are opened, the other valves are closed, the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem are in a deep coupling operation mode (mode 4), the solar energy and the geothermal energy heated by the solar energy are respectively used as a high-temperature heat source and a low-temperature heat source of the transcritical carbon dioxide circulation subsystem, and the mode has low requirement on the temperature of the geothermal energy resource.

Therefore, different power generation modes of the trans-critical carbon dioxide power generation system driven by the solar and geothermal energy in a combined mode can be switched to operate by setting different conditions, and compared with the existing single geothermal power generation system and single solar power generation system, the trans-critical carbon dioxide power generation method driven by the solar and geothermal energy in a combined mode is high in power generation efficiency, small in operation fluctuation, high in stability, green, clean and pollution-free, and land resources are saved.

The invention discloses a transcritical carbon dioxide power generation method driven by solar energy and geothermal energy in a preferred embodiment, which comprises the following specific control methods:

the starting control method comprises the following steps: the whole power plant system is firstly prepared to be started, and the instant geothermal energy temperature T is firstly checked_geothermal(i.e. the temperature of geothermal energy at the outlet of the pumping well 73 is T_geothermalWhich is used to evaluate whether the geothermal energy resource temperature is suitable for heating alone and power generation), and to evaluate the inlet temperature T of the solar heater 1_solar(certain evaluation needs to be carried out according to external factors such as weather conditions, environmental temperature and the like in a certain future operating period, and it is noted that the value can also be evaluated according to the working condition of the solar subsystem) so as to obtain the prediction information of energy output; giving a judgment condition of "T_geothermal>T_{geothermal_min}Or T_solar>T_{solar_start2}”(T_{geothermal_min}The lower temperature limit of geothermal resources suitable for being used as an independent heat source to supply circulating heat and generate electricity is 90 to100℃；T_{solar_start2}The lower limit of the solar temperature of the system in a coupling operation mode of the geothermal energy subsystem and the solar energy subsystem is indicated to be suitable for operating, the range is 290-300 ℃), if the condition is not met, the resource condition is not met, the power plant is kept to be closed, and if the condition is met, all the subsystems are started; then, a judgment condition of "T" is given_geothermal>T_{geothermal_min}If the conditions are not met, the geothermal energy temperature is not suitable to be used as a heat source for heat supply and power generation independently, the first bypass valve 63, the second control valve 65 and the third control valve 67 are opened, other valves are closed, the geothermal energy subsystem and the solar energy subsystem are in a coupling operation mode (mode 2), the rated output power of the combined system is achieved as far as possible through the operation mode 2, and the starting of the power plant system is completed; if the conditions are met, the geothermal energy temperature is suitable for being used as a heat source for heat supply and power generation independently, the first bypass valve 63, the second bypass valve 66 and the third control valve 67 are opened, other valves are closed, the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem are in a coupling operation mode (mode 1), the rated output power of the combined system is achieved as far as possible through the operation mode 1, and starting is completed;

the operation control method comprises the following steps: monitoring energy output information in real time, i.e. T, upon completion of normal start-up_geothermalAnd T_solarReal-time information of (2); notably, T_solarThe operation condition of a solar subsystem (mainly comprising a heat collection system and a heat storage subsystem) needs to be comprehensively considered, and the heat collection system is preferentially used for supplying heat; then, a judgment condition "T" is given_solar>T_{solar_normal}”(T_{solar_normal}The lower limit of the temperature of the solar energy resource which is suitable for being directly used as a circulating heat source is shown, and the range is 330-340 ℃); if the condition "T_solar>T_{solar_normal}If the judgment result is not satisfied, the solar energy resource is slightly deficient or very deficient and is not suitable for being directly used as a circulating high-temperature heat source for heat supply, and then a judgment condition T is given_{solar_min}＜T_solar≤T_{solar_normal}- Δ T1 or T_geothermal＞T_{geothermal_min}”(T_{solar_min}Represents the lower temperature limit and range of the normal operation of the solar subsystemEnclosing at 240-260 ℃; Δ T1 represents the upper temperature limit and T of the determination condition_{solar_normal}The temperature difference is constant and ranges from 5 ℃ to 15 ℃), if the conditions are not met, the solar energy resource is very deficient, the system should keep the operation in a mode (mode 1) that the geothermal energy subsystem and the transcritical carbon dioxide circulation subsystem are coupled, if the conditions are met, the solar energy resource is slightly deficient, the first bypass valve 63, the second control valve 65 and the third control valve 67 should be opened, the rest valves are closed, and the system enters a mode (mode 2) that the geothermal energy subsystem and the solar energy subsystem are coupled and operates to keep operating; if the condition "T_solar>T_{solar_normal}If the solar energy is sufficient or very sufficient, the first control valve 62, the second bypass valve 66 and the fourth control valve 68 should be opened, the rest valves should be closed, and the operation mode (mode 3) of coupling the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is entered; next, a judgment condition "T" is given_solar>T_{solar_storage}”(T_{solar_storage}The lower temperature limit of the heat storage subsystem 54 in normal operation is indicated, the range is 340-350 ℃), if the condition is met, the heat storage subsystem 54 can be started to store redundant heat of the heat collection system, if the condition is not met, the solar energy resource is not surplus, the heat collection system can only be operated, and the heat storage subsystem 54 is kept closed; then, the determination condition "T" is determined_{solar_check}-T_geothermalΔ T2 ≧ Δ T (Δ T2 denotes T_{solar_check}And T_geothermalThe temperature difference is constant and ranges from 50 ℃ to 90 ℃), if the conditions are not met, the solar energy resource is sufficient, the operation in a mode (mode 3) of coupling the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystem is continuously kept, if the conditions are met, the solar energy resource is sufficient, after the carbon dioxide circulation working medium is heated, the temperature of the heat collection working medium in the solar energy subsystem is still high enough to improve the energy grade of the geothermal energy to a certain degree, the first control valve 62, the second control valve 65 and the fourth control valve 68 are opened, the rest valves are closed, and the heated heat collection working medium enters the geothermal energy subsystem, the solar energy subsystem and the transcritical carbon dioxide circulation subsystemA system deep coupling operation mode (mode 4) for keeping operation; and finally, completing the adjustment and switching of the operation modes in one control period, if the next control period is continued, restarting the operation control method, starting the cyclic power generation, and if the next control period is not continued, gradually closing the whole power plant system.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.