CN112834340A - Indoor loading device for simulating microwave irradiation crushing of dry-hot rock in geothermal environment - Google Patents
Indoor loading device for simulating microwave irradiation crushing of dry-hot rock in geothermal environment Download PDFInfo
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- CN112834340A CN112834340A CN202011641036.XA CN202011641036A CN112834340A CN 112834340 A CN112834340 A CN 112834340A CN 202011641036 A CN202011641036 A CN 202011641036A CN 112834340 A CN112834340 A CN 112834340A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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Abstract
The invention relates to an indoor loading device for crushing dry hot rock by microwave irradiation under a simulated geothermal environment, belonging to the field of development of geothermal energy of dry hot rock. An indoor loading device for simulating microwave irradiation to break dry heat rock in a geothermal environment mainly comprises: the system comprises a geothermal environment simulation system, a microwave control system, a loading control system and a stainless steel cavity with a lead-containing glass window. The indoor loading device for crushing the hot dry rock by microwave irradiation in the simulated geothermal environment can meet the loading tests of rock samples under different environmental temperatures, microwave irradiation powers and microwave irradiation times, can realize real-time monitoring of rock deformation by matching with a machine vision technology, and can meet the hot dry rock microwave irradiation tests of different requirements.
Description
Technical Field
The invention relates to the field of development of geothermal energy of dry hot rocks, and particularly discloses an indoor loading device for crushing the dry hot rocks by microwave irradiation in a simulated geothermal environment.
Background
The geothermal energy of the dry hot rock is taken as clean energy with huge potential, however, the development of the geothermal energy is far from reaching the stage of commercial application. From the viewpoint of development of the hot dry rock, the reason is mainly due to high temperature and high hardness caused by the geological environment of the hot dry rock. Microwave irradiation is widely applied to material heating application, and domestic and foreign researches show that the microwave irradiation can effectively crush granite, which is a typical hot dry rock. Therefore, microwave irradiation may be a potential hot dry rock development aid.
Since the 20 th century 70 th U.S. first developed the hot dry rock system in New Mexico, Germany, France, England, Switzerland, Japan, Australia, etc. developed hot dry rock successively, which has been over 50 years old. In 1987, the first dry hot rock geothermal power generation system in the world was established in the united states. Over 10 years in germany and uk, extensive research has been conducted on hydraulic fracturing of hot dry rock. The hot dry rock temperature of 4 drilling sites of 2000-2200 m in mountain county in the southwest of the northeast of Japan reached 250 ℃. In 1989, hot dry rock with 4 drilling depths of 1800 and 2150 meters near the Hijiori volcano in Japan reaches 250 ℃, and the development of the hot dry rock is proposed for the first time to check the development state of the existing natural fractures of the reservoir. And when the drilling depth of the autumn field showplace in the northeast area of island of Benzhou of Japan just exceeds 1km, the temperature of the hot dry rock reaches 230 ℃. In the period from 1987 to 2005, the highest temperature of the hot dry rock of 4 deep wells in German and French frontier of European Union reaches 200 ℃, and a hot dry rock power station with the scale of 1.5MW is successfully established in 2009.
The response of the rock to microwave irradiation is driven by the conversion of electromagnetic energy into thermal energy. The heat generated by the rock in the microwave environment is mainly related to factors such as microwave power, irradiation time and mineral characteristics. Both high microwave power and long irradiation times generate more heat. The dielectric properties of the rock-making mineral determine the microwave activity of the rock. For example, biotite is easy to absorb microwaves and convert the microwaves into heat energy, whereas quartz, feldspar and other common rock-forming minerals are weak in absorbing and converting the microwaves. For a given rock type, the differences in the absorption and conversion of microwaves by different minerals cause the rock to exhibit non-uniform heating under microwave radiation, resulting in the occurrence of thermal gradients, thereby creating thermal stresses between the different minerals. When the thermal stress exceeds the fracture strength of the mineral, two modes of microcracking occur at the mineral level, intergranular and intergranular fractures respectively. In addition, the anisotropy of the mineral and the alpha-beta transformation of quartz also promote crack propagation. Eventually, a large number of microcracks aggregate and develop into a network of cracks, thereby significantly weakening the rock strength.
An essential means for researching the breaking mechanism of the dry-hot rock under microwave irradiation in an indoor laboratory. However, the conventional microwave irradiation equipment usually performs a microwave irradiation test at room temperature, and cannot simulate the geothermal environment of the hot dry rock, so that it is necessary to develop an indoor loading device for simulating microwave irradiation to break the hot dry rock in the geothermal environment.
Disclosure of Invention
The invention provides an indoor loading device for breaking dry hot rock by simulating microwave irradiation in a geothermal environment, aiming at overcoming the defects of the prior art.
In order to achieve the purpose, the invention provides an indoor loading device for crushing dry hot rock by microwave irradiation in a simulated geothermal environment. By carrying out microwave irradiation on the rock sample under the simulated geothermal and high-pressure environment and designing a lead-containing glass window, the deformation of the rock sample can be monitored in real time through a machine vision technology on the premise of isolating the microwave irradiation, so that the process for crushing granite by microwave irradiation under the high-pressure geothermal condition is obtained, and the evolution rule of the mechanical strength of the hot dry rock is revealed.
Compared with the traditional microwave irradiation test device, the device provided by the invention can realize tests comprising the following steps: a. carrying out a microwave irradiation test on a normal-temperature rock sample under atmospheric pressure; b. carrying out heat preservation treatment on a rock sample in advance, and carrying out a microwave irradiation test under atmospheric pressure; c. performing heat preservation treatment on a rock sample in advance, and performing a microwave irradiation test under a certain pressure; d. carrying out a uniaxial compression test on a normal-temperature rock sample after microwave irradiation treatment and cooling at atmospheric pressure; e. carrying out a uniaxial compression test on a normal-temperature rock sample after microwave irradiation treatment and cooling under a fixed vertical pressure; f. carrying out heat preservation treatment on a rock sample in advance, then carrying out microwave irradiation treatment under a fixed vertical pressure, and carrying out a cooled uniaxial compression test; g. a synchronous uniaxial compression test of a normal-temperature rock sample under microwave irradiation; h. the rock sample is subjected to heat preservation treatment in advance, and is subjected to a synchronous uniaxial compression test under microwave irradiation.
Compared with the traditional microwave irradiation device, the device has the advantages that: a. the simulation of the high-temperature and high-pressure environment of the hot dry rock is realized; b. the separated design can allow magnetrons with different microwave powers to be adopted, thereby allowing a more relaxed experimental design; c. the monitoring of the mechanical property, deformation and surface appearance change of the rock under microwave irradiation can be synchronously realized.
According to an embodiment of the invention, the indoor high-temperature loading test device for microwave irradiation crushing of the hot dry rock mainly comprises: the system comprises a geothermal environment simulation system, a microwave control system, a loading control system and a stainless steel cavity with a lead-containing glass window.
According to one embodiment of the invention, the geothermal environment simulation system comprises a 7-PID controller, a 2-alumina fiber block and a 3-resistance wire.
According to one embodiment of the invention, the microwave control system comprises 13-a PJ26 type waveguide with mica baffles, 14-a magnetron kit with cooling water, 15-a power supply and control system, 16-a power supply data line and 19-an infrared thermometer.
According to one embodiment of the invention, the loading control system comprises 8-compression with oil cylinder, 9-support column, 10-counter-force beam, 11-counter-force column, 12-oil cylinder and control system, 17-data line for loading equipment and 18-computer.
According to an embodiment of the invention, the stainless steel chamber with a leaded glass window comprises a 4-stainless steel chamber, a 5-furnace door and a 6-leaded glass window.
According to an embodiment of the invention, the synchronous uniaxial compression test process of the rock sample subjected to heat preservation treatment in advance and carried out under microwave irradiation specifically comprises the following steps: firstly, opening a cavity furnace door, and closing the cavity furnace door after a rock sample is put in; then, opening the loading equipment oil cylinder, controlling the oil cylinder to enable the top of the rock sample to be in contact with the supporting column through a computer, setting a certain pressure value according to the test requirement and stabilizing the pressure; then, opening and heating the resistance wire through a PID controller, thereby heating the cavity and keeping the temperature of the rock sample at a set temperature for more than 4 h; after the temperature of the rock sample is reached, the magnetron cooling water is turned on, the control host machine adjusts the microwave to irradiate the rock sample in a constant power or constant temperature mode, the microwave is transmitted from the magnetron through the waveguide tube and then irradiates from the back of the rock, and when the preset microwave irradiation time or temperature is reached, the microwave system is controlled to adjust the microwave power to ensure the temperature of the rock sample; and finally, controlling a loading device to compress the rock sample at a constant speed, and automatically recording the stress-strain curve of the rock sample by the loading device.
In conclusion, the invention provides an indoor loading device for crushing dry-hot rock by microwave irradiation in a simulated geothermal environment. The method and the provided device can meet the loading tests of rock samples under different environmental temperatures, microwave irradiation powers and microwave irradiation times, can realize real-time monitoring of rock deformation by matching with a machine vision technology, and can meet the hot dry rock microwave irradiation tests with different requirements.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a front view of an indoor loading device for breaking dry hot rock by microwave irradiation in a simulated geothermal environment according to an embodiment of the present invention.
Fig. 2 is a top view of an indoor loading device for breaking dry hot rock by microwave irradiation in a simulated geothermal environment according to an embodiment of the present invention.
Fig. 3 is a side view of an indoor loading device for breaking dry hot rock by microwave irradiation in a simulated geothermal environment according to an embodiment of the present invention.
Reference numbers in the figures: 1-a rock sample; 2-alumina fiber block with hollow cylinder; 3-resistance wire; 4-stainless steel chamber; 5-furnace door; 6-leaded glass windows; 7-a PID controller; 8-a compression column with an oil cylinder; 9-a support column; 10-a counter-force beam; 11-a reaction column; 12-oil cylinder and control system; 13-a PJ26 type waveguide with mica baffles; 14-magnetron kit with cooling water; 15-power supply and control host for microwave; 16-data and power lines for microwaves; 17-load the data line for the device; 18-a computer; 19-infrared thermometer.
Detailed Description
As shown in FIG. 1, the indoor loading device for simulating microwave irradiation to crush hot dry rock in a geothermal environment comprises a geothermal environment simulation system, a microwave control system, a loading control system and a stainless steel cavity with a lead-containing glass window.
The microwave output mode of the microwave equipment comprises the following steps: firstly, outputting microwaves according to set time under the condition of constant microwave power, and secondly, automatically adjusting the microwave power to output the microwaves according to a set temperature-time curve.
According to the equipment provided by the invention, the microwave irradiation test of the normal-temperature rock sample under the atmospheric pressure comprises the following main processes: opening a furnace door, and closing the furnace door after a rock sample is put in; secondly, opening the cooling water of the magnetron, setting a microwave output mode, controlling a microwave system to enable the magnetron to be opened and emit microwaves, and monitoring the temperature of the rock sample by an infrared thermometer in real time; and thirdly, when the set microwave output time or the set temperature is reached, the system automatically closes the microwave output.
According to the equipment provided by the invention, the method for realizing the uniaxial compression test after the rock sample is subjected to microwave irradiation treatment and cooling under normal temperature and atmospheric pressure comprises the following steps: after the microwave irradiation test carried out under the normal temperature and the atmospheric pressure is finished, the loading equipment is adjusted to enable the upper top surface of the rock sample to be in contact with the supporting column, the loading equipment is controlled to compress the rock sample at a constant loading rate until the rock sample is damaged, and the loading control system records the stress-strain curve of the rock sample in real time.
According to the equipment provided by the invention, the uniaxial compression test of the normal-temperature rock sample after microwave irradiation treatment and cooling under a fixed vertical pressure comprises the following main processes: opening a furnace door, putting a rock sample, adjusting loading equipment to enable the upper top surface of the rock sample to be in contact with a support column, and then closing the furnace door; adjusting a PID controller to enable the resistance wire to be heated, so that the geothermal environment of the rock is simulated; thirdly, opening cooling water, setting a microwave output mode, and controlling a system to enable a magnetron to be started and emit microwaves; and fourthly, when the rock sample reaches the preset microwave irradiation time or completes the temperature-time curve, the system automatically controls the magnetron to stop emitting the microwaves.
According to the equipment provided by the invention, the rock sample is subjected to heat preservation treatment in advance and is subjected to a synchronous uniaxial compression test under microwave irradiation, and the main process is as follows: opening a furnace door, putting a rock sample, adjusting loading equipment to enable the upper top surface of the rock sample to be in contact with a support column and applying a certain pressure stabilizing force, and then closing the furnace door; adjusting a PID controller to heat the resistance wire, so that the rock sample is kept warm for more than 4 hours at a certain temperature under a certain pressure, and the geothermal environment of the rock is simulated; controlling a loading device to compress the rock sample at a constant loading rate until the rock sample is damaged, and recording the stress-strain curve of the rock sample in real time by a loading control system.
The BJ26 type magnetron included in the apparatus provided by the invention is an industry standard and is not limited herein.
The equipment provided by the invention does not limit the contained parameters such as microwave magnetron power and the like.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides an indoor loading device of broken dry heat rock of microwave irradiation under simulation geothermal environment which characterized in that includes: the system comprises a geothermal environment simulation system, a microwave control system, a loading control system and a stainless steel cavity with a lead-containing glass window.
2. The geothermal environment simulation system of claim 1, comprising the PID controller, a block of alumina fiber, and a resistance wire.
3. The microwave control system according to claim 1, comprising a PJ26 type waveguide with mica baffles, a magnetron kit with cooling water, a power supply and control system, a power supply data line and an infrared thermometer.
4. The loading control system of claim 1, comprising a compression device with a ram, a support post, a reaction beam, a reaction post, a ram and control system, a data line for a loading device, and a computer.
5. The stainless steel chamber with a leaded glass window of claim 1, comprising a stainless steel chamber, a furnace door and a leaded glass window.
6. The microwave control system and loading control system of claim 1 wherein the microwave irradiation irradiates the side of the cylindrical rock sample vertically and the loading device presses the bottom surface of the cylindrical rock sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011641036.XA CN112834340A (en) | 2020-12-31 | 2020-12-31 | Indoor loading device for simulating microwave irradiation crushing of dry-hot rock in geothermal environment |
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| CN202011641036.XA CN112834340A (en) | 2020-12-31 | 2020-12-31 | Indoor loading device for simulating microwave irradiation crushing of dry-hot rock in geothermal environment |
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| CN112834340A true CN112834340A (en) | 2021-05-25 |
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| CN202011641036.XA Pending CN112834340A (en) | 2020-12-31 | 2020-12-31 | Indoor loading device for simulating microwave irradiation crushing of dry-hot rock in geothermal environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686753A (en) * | 2021-09-14 | 2021-11-23 | 中国科学院武汉岩土力学研究所 | Method for performing penetration test on rock sample |
| CN114752762A (en) * | 2022-04-29 | 2022-07-15 | 武汉科技大学 | Method for enhancing ore grinding and leaching of vanadium shale by microwaves |
-
2020
- 2020-12-31 CN CN202011641036.XA patent/CN112834340A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686753A (en) * | 2021-09-14 | 2021-11-23 | 中国科学院武汉岩土力学研究所 | Method for performing penetration test on rock sample |
| CN114752762A (en) * | 2022-04-29 | 2022-07-15 | 武汉科技大学 | Method for enhancing ore grinding and leaching of vanadium shale by microwaves |
| CN114752762B (en) * | 2022-04-29 | 2024-01-26 | 武汉科技大学 | Method for reinforcing vanadium shale grinding and promoting leaching by microwaves |
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