[0019] The present invention provides an electric power self-circulation system for simulating the test of a geothermal power generation device. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention is further described below in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0020] see figure 1 , The present invention provides a power self-circulation system for simulating the test of a geothermal power generation device, including a high-temperature water tank 20 connected to the air-source heat pump unit 10 and the air-source heat pump unit and a generator set 30 connected to the high-temperature water tank. The generator set includes a generator 40, the air source heat pump set includes a compressor 50, and the generator is electrically connected to the compressor.
[0021] Geothermal power generation is a new type of power generation technology using underground hot water and steam as power sources. Its basic principle is similar to thermal power generation. In fact, it is an energy conversion process that converts underground thermal energy into mechanical energy, and then converts mechanical energy into electrical energy, or is called geothermal power generation. However, the power generated by the existing simulated geothermal power generation test device is usually tested by externally connecting the load to test the power generation performance of the geothermal power generation test device. , and the simulated geothermal power generation device test system has become more complex, thus greatly restricting the development of geothermal power generation technology.
[0022] In order to solve the above technical problems, the technical solution of the present invention adopts a self-circulation method for the electric power in the electric power self-circulation system tested by the simulated geothermal power generation device. The hot water is used to heat and evaporate the organic working fluid in the pipeline of the generator set, and then the organic working fluid steam expands in the expander to drive the generator to generate electricity. The generated electricity is self-circulating. The patent of the present invention proposes a power self-circulation power generation scheme, which not only saves the consumption of power energy, but also achieves the dual purpose of using the compressor in the air source heat pump unit to measure the power generation performance of the geothermal generator in real time.
[0023] The electric power self-circulation system tested by the simulated geothermal power generation device of the technical solution of the present invention utilizes the principle of organic Rankine cycle (ORC), which is a Rankine cycle with low-boiling organic matter as the working medium, and its working principle is that the organic working medium is in the evaporator. Absorbs heat from geothermal water to generate steam with a certain pressure and temperature. The steam enters the expander and expands to do work, thereby driving the generator or driving other power machinery to work. The working fluid after power generation discharged from the expander is in the condenser. It releases heat to the cooling liquid, condenses into a liquid working medium, and finally returns to the evaporator with the help of the working medium pump, and so on.
[0024] In the conventional water vapor Rankine cycle, the working medium is water vapor. The working fluid continuously undergoes four processes of isobaric heating, adiabatic expansion, isobaric heat release and adiabatic compression in the thermal equipment, so that thermal energy is continuously converted into mechanical energy. When using a low-temperature organic working medium (such as pentane) as the circulating working medium, the main equipment includes: evaporator, steam turbine, condenser and circulating pump, etc. The electric power self-circulation system tested by the device of the technical solution of the present invention preferably adopts organic Working quality. For low and medium enthalpy heat, ORC technology has many advantages compared with conventional steam Rankine cycle, mainly reflected in higher efficiency in recovering sensible heat. This proportion is large. Therefore, more heat can be recovered by adopting the ORC technology, that is, the power generation efficiency of the present invention is higher by adopting the ORC technology.
[0025] see figure 1 , in a preferred embodiment, the air source heat pump unit further includes a first condenser 60 and a first evaporator 70, and the first condenser, the compressor and the first evaporator are connected in sequence in a cycle. Air source heat pump refers to the ability to absorb low-temperature heat in the air through the evaporator, vaporize it through organic or inorganic media, and then compress it through the compressor, pressurize it and heat it up, and then convert it through the condenser to heat the room temperature water, and the compressed high temperature The heat energy is used to heat the water temperature, which has the characteristics of high efficiency and energy saving. The same amount of hot water is produced, and the energy saving efficiency is 4-6 times that of the general electric water heater, and the annual average thermal efficiency ratio is 4 times that of the electric heating.
[0026] see figure 1 , in a preferred embodiment, a throttle valve 80 is also connected between the first condenser and the first evaporator. The throttle valve is a valve that controls the fluid flow by changing the throttling section or the throttling length. In another solution, the throttle valve of the present invention can also cooperate with the overflow valve to form a throttle speed regulation system, so as to accurately control the flow rate of the working medium inside the pipeline in the pipeline. .
[0027] In a preferred embodiment, the high temperature water tank is connected to the first condenser. During the specific operation of the air source heat pump unit of the present invention, the compressor in the air source heat pump is firstly started by using the commercial power, the organic working medium in the air source heat pump pipeline is evaporated into a gaseous state through the first evaporator, and then the gaseous organic working medium is condensed. After the condenser is condensed, it turns into a liquid state, and exothermic heats the water in the high-temperature water tank. After that, the liquid organic working medium is evaporated through the evaporator and the above steps are cycled in turn until the water in the high-temperature water tank reaches a predetermined temperature. High temperature refers to the temperature range of 90-100°C.
[0028] see figure 1 , in a preferred embodiment, a first circulating pump 90 is connected between the high temperature water tank and the first condenser. In order to make the temperature conduction of the water in the high temperature water tank more rapid and uniform, while the condenser is heating the water in the water tank, a first circulating pump is set to accelerate the circulation of the water in the water tank. The first circulating pump is a forward and reverse circulating pump, which makes the temperature spread more evenly through regular forward and reverse rotation. When a one-way circulating pump is used, the one-way flow of the water flow will easily cause the temperature of the water flow in the pipeline on the front side of the condenser to be higher than that of condensation. The temperature of the water flow in the pipeline on the rear side of the device is much higher, and the use of the forward and reverse circulating pump can well balance the uneven temperature on both sides of the pipeline caused by the one-way flow of the water flow.
[0029] see figure 1 , in a preferred embodiment, the generator set further includes a second evaporator 100, a second condenser 110 and an expander 120, and the second evaporator, the second condenser and the expander are connected in sequence in a cycle.
[0030] see figure 1, in a preferred embodiment, a working fluid pump 130 is connected between the second condenser and the second evaporator. In order to facilitate the flow of the organic working fluid in the connecting pipeline of the generator set, a working fluid pump is also provided between the second condenser and the second evaporator. Preferably, the working fluid pump is a one-way pump, so as to drive the organic working fluid. One-way flow of quality.
[0031] In a preferred embodiment, the generator set composed of the generator and the expander in the technical solution of the present invention can be replaced by a small generator. Specifically, the small geothermal generator includes a stator, and the stator is composed of a cylindrical One end of the rotor is inserted into the rotor, the other end of the rotor is fixed with a rotating rod, a rotating plate is installed on the rotating rod, and the welded blades are equidistant on the circumference of the rotating disk. The section is arc-shaped, and the angle formed by the blade and the circumference of the turntable is 60-90°. The characteristics of this kind of geothermal generator structure are that it can realize miniaturization and flexible distribution, realize the combination of steam turbine function and generator function, which is convenient for installation in the limited space of the laboratory, and can effectively improve the power generation efficiency.
[0032] In a preferred embodiment, the high temperature water tank is connected to the second evaporator. The hot water in the high-temperature water tank heats the organic working medium in the second evaporator, so that the liquid organic working medium is evaporated into a gaseous state, the volume becomes larger, and the pressure increases, thereby driving the expander to rotate and drive the generator to generate electricity.
[0033] see figure 1 , in a preferred embodiment, a second circulating pump 130 is connected between the high temperature water tank and the second evaporator. In order to make the heat exchange between the high temperature water tank and the second evaporator more rapid, a second circulation pump is arranged on the connecting pipe between the high temperature water tank and the second evaporator, and the second circulation pump can promote the high temperature water tank and the second evaporator pipe. The water in the water flows rapidly, and, preferably, the second circulating pump in the technical solution of the present invention is a forward and reverse circulating pump, which can be reversed at regular intervals to make the temperature of the water in the high-temperature water tank and the pipeline more uniform, indirectly. The power generation efficiency of the generator is improved.
[0034] During the specific operation of the generator set of the present invention, since the water in the high-temperature water tank reaches a predetermined temperature, the hot water in the high-temperature water tank heats the organic working medium in the second evaporator in the generator set, and the organic working medium evaporates into After that, the temperature of the water in the high-temperature water tank decreases, and the gaseous organic working medium passes through the expander, performs work on the expander, drives the expander to rotate, the expander drives the generator to generate electricity, and the electricity generated by the generator is sent to the air source. The compressor in the heat pump unit and the air source heat pump unit use the condenser to reheat the water in the high temperature water tank, which realizes the self-circulation utilization of the power generated by the simulated geothermal power generation test device, reduces the power consumption, and the experimental cost is low. At the same time, according to the relationship between the rated power of the air source heat pump unit and the input of mains power, the power generation and power generation of the simulated geothermal power generation test device can be calculated.
[0035] A power self-circulation system for simulating a geothermal power generation device test of the present invention mainly includes an air source heat pump unit, a high temperature water tank and a generator unit, wherein the air source heat pump unit includes a first condenser, a throttle valve, a first evaporator and a compressor. The generator set (taking ORC as an example) includes a second evaporator, an expander, a generator and a second condenser. In the startup phase of the power self-circulation system tested by the simulated geothermal power generation device of the present invention, only the air source heat pump needs to be turned on, the room temperature water is heated to the temperature required for geothermal power generation by the air source heat pump, and the hot water is stored in the high temperature water tank. After the temperature of the hot water in the high-temperature water tank is stable, the high-temperature water tank supplies hot water to the generator set under test, and the generator set uses the thermal energy in the hot water to generate electricity. The forms of generator sets are different. Taking the organic Rankine cycle geothermal water generator set as an example, the organic working fluid absorbs the heat in the geothermal water in the evaporator and evaporates, and then the organic working fluid steam enters the expander to expand and do work to drive Generator to generate electricity. In terms of power cycle, after the generator generates electricity, the generated electric energy is directly sent to the air source heat pump, and it is given priority to supply power to the air source heat pump over the mains. It should be noted that after the electric energy generated by the generator is used for the power supply of the air source heat pump, the demand of the air source heat pump for the mains power supply is reduced. At this time, the variable frequency power consumption system of the air source heat pump will automatically adjust according to the water temperature of the high temperature water tank. The commercial power input the electricity of the air source heat pump to maintain the temperature in the high temperature water tank at the temperature required for the test. The invention uses the power generated in the laboratory simulated geothermal power generation device for the use of the air source heat pump, realizes the self-circulation of part of the power of the power generation device, and can use the compressor in the air source heat pump unit to test the power generation performance of the geothermal generator in real time. parameters, and can play a role in saving power consumption.
[0036] It should be further noted that the heating method of the high-temperature water tank in the technical solution of the present invention can use all other heating methods using electric energy in addition to the air source heat pump; It is a variety of other power generation components that utilize thermal energy.
[0037] To sum up, a power self-circulation system for simulating the test of a geothermal power generation device provided by the present invention includes a high-temperature water tank connected with the air-source heat pump unit and the high-temperature water tank, and a generator set connected with the high-temperature water tank. The generator set includes a generator, the air source heat pump set includes a compressor, and the generator is electrically connected to the compressor. The electric power self-circulation system tested by the simulated geothermal power generation device of the present invention electrically connects the generator in the generator set with the compressor in the air source heat pump unit, and the electric power generated by the generator in the generator set can be used to drive the air source heat pump The compressor in the unit, the simulated geothermal power generation test device of the present invention can realize the self-circulation utilization of the power generated by itself, so as to not only use the compressor in the air source heat pump unit to test the performance parameters of the geothermal generator in real time, but also to Play the role of saving electric energy and reducing the experimental cost of the device.
[0038] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.
