阅读说明：本技术 率定平台水循环温度控制系统 (Calibration platform water circulation temperature control system ) 是由 张朝鹏 谢和平 张茹 张泽天 陈领 高明忠 张志龙 李怡航 杨阳 李佳南 黄伟 于 2021-01-15 设计创作，主要内容包括：本发明公开了一种率定平台水循环温度控制系统,应用于深部原位保真取芯“五保”能力率定平台,包括降温池、污水池、降温盘管、加热管道、第一高频感应线圈、第二高频感应线圈、低压泵、高压泵、第一温压传感器、第二温压传感器、第三温压传感器、第一压力变送器、第二压力变送器、第一液控阀、第二液控阀、第三液控阀、第四液控阀、第一安全阀、第二安全阀、第三安全阀、模拟舱体、第一常温管道、第二常温管道和第三常温管道。本发明通过数据自动采集系统与计算机技术,在保证高温高压管道安全的同时,为深部原位高温高压环境模拟舱提供了可靠的温压控制系统,能够为深地原位岩体力学及深地科学前沿探索提供基础预研条件。(The invention discloses a calibration platform water circulation temperature control system, which is applied to a deep in-situ fidelity coring 'five-protection' capability calibration platform and comprises a cooling pool, a sewage pool, a cooling coil, a heating pipeline, a first high-frequency induction coil, a second high-frequency induction coil, a low-pressure pump, a high-pressure pump, a first temperature-pressure sensor, a second temperature-pressure sensor, a third temperature-pressure sensor, a first pressure transmitter, a second pressure transmitter, a first hydraulic control valve, a second hydraulic control valve, a third hydraulic control valve, a fourth hydraulic control valve, a first safety valve, a second safety valve, a third safety valve, a simulation cabin body, a first normal temperature pipeline, a second normal temperature pipeline and a third normal temperature pipeline. According to the invention, through the automatic data acquisition system and the computer technology, the safety of the high-temperature high-pressure pipeline is ensured, and meanwhile, a reliable temperature and pressure control system is provided for the deep in-situ high-temperature high-pressure environment simulation cabin, so that basic pre-research conditions can be provided for deep in-situ rock mechanics and deep science front-end exploration.)

1. The calibration platform water circulation temperature control system is characterized by comprising a cooling pond (1), a sewage pond (2), a cooling coil (3), a heating pipeline (4), a first high-frequency induction coil (5-1), a second high-frequency induction coil (5-2), a low-pressure pump (6-1), a high-pressure pump (6-2), a first temperature-pressure sensor (7-1), a second temperature-pressure sensor (7-2), a third temperature-pressure sensor (7-3), a first pressure transmitter (8-1), a second pressure transmitter (8-2), a first hydraulic control valve (9-1), a second hydraulic control valve (9-2), a third hydraulic control valve (9-3), a fourth hydraulic control valve (9-4), a first safety valve (10-1), a second safety valve (10-2), A third safety valve (10-3), a simulated cabin body (11), a first normal-temperature pipeline (12-1), a second normal-temperature pipeline (12-2) and a third normal-temperature pipeline (12-3);

the cooling coil (3) is fixedly arranged in the cooling pool (1); the input end of the cooling coil (3) is fixedly connected with the simulation cabin body (11) through a second normal-temperature pipeline (12-2), and the output end of the cooling coil is fixedly arranged in the sewage tank (1); one end of the heating pipeline (4) and one end of the third normal-temperature pipeline (12-3) are both fixedly arranged in the cooling pond (1); a first high-frequency induction coil (5-1), a low-pressure pump (6-1), a first temperature and pressure sensor (7-1) and a second high-frequency induction coil (5-2) are sequentially and fixedly arranged on the outer wall of the heating pipeline (4); the other end of the heating pipeline (4) is fixedly connected with one end of a first normal temperature pipeline (12-1) through a high-pressure pump (6-2); a second hydraulic control valve (9-2), a first safety valve (10-1), a first pressure transmitter (8-1) and a second temperature and pressure sensor (7-2) are fixedly arranged on the outer wall of a first branch of the first normal temperature pipeline (12-1), and a third hydraulic control valve (9-3), a second safety valve (10-2) and a second pressure transmitter (8-2) are fixedly arranged on the outer wall of a second branch; the other end of the first branch and the other end of the second branch are both fixedly connected with the simulation cabin body (11); the high-pressure pump (6-2) is also fixedly connected with one end of a third normal-temperature pipeline (12-3); the other end of the third normal-temperature pipeline (12-3) is fixedly arranged in the cooling pool (1); a first hydraulic control valve (9-1) and a third temperature and pressure sensor (7-3) are fixedly arranged on the outer wall of the third normal temperature pipeline (12-3); a fourth hydraulic control valve (9-4) is fixedly arranged on the outer wall of the second normal-temperature pipeline (12-2);

the low-pressure pump (6-1), the high-pressure pump (6-2), the first pressure transmitter (8-1) and the second pressure transmitter (8-2) are all in communication connection with a computer.

2. Calibration platform water circulation temperature control system according to claim 1, characterized in that a filtration system is installed in the sump (2).

3. The calibration platform water circulation temperature control system of claim 1, wherein the outer walls of the heating pipeline (4), the first normal temperature pipeline (12-1), the second normal temperature pipeline (12-2) and the third normal temperature pipeline (12-3) are all fixedly provided with heat insulation layers.

4. The calibration platform water circulation temperature control system according to claim 1, wherein the first high frequency induction coil (5-1) and the low pressure pump (6-1) form a primary heating and pressurizing unit for heating water at normal temperature and pressure to 90 ℃ and pressurizing water at normal pressure to 5 MPa.

5. The calibration platform water circulation temperature control system according to claim 1, wherein the second high frequency induction coil (5-2) and the high pressure pump (6-2) form a secondary heating and pressurizing unit for heating water at normal temperature and pressure to 150 ℃ and pressurizing water at normal pressure to 140 MPa.

6. The water circulating temperature control system of the rating platform of claim 1, wherein the first pressure transmitter (8-1) and the second pressure transmitter (8-2) are identical in structure and each comprise a resistor R1-R16, a sliding varistor RP1-RP3, a capacitor C1, a diode D1-D8, a transistor T1-T5, a compound transistor T6 and an operational amplifier LM1-LM 2;

the cathode of the diode D1 is respectively connected with the drain of the triode T1, the collector of the triode T5, one end of the resistor R8, one end of the resistor R16 and the first fixed end of the slide rheostat RP 2; the source electrode of the triode T1 is connected with one end of the resistor R1; the grid electrode of the triode T1 is respectively connected with the other end of the resistor R1, the negative electrode of the diode D2 and the base electrode of the triode T5; the anode of the diode D2 is respectively connected with the cathode of the diode D3 and one end of the resistor R2; the anode of the diode D3 is connected with the anode of the diode D4; the other end of the resistor R2 is respectively connected with one end of a resistor R3 and the non-inverting input end of the operational amplifier LM 1; the inverting input end of the operational amplifier LM1 is connected with the moving end of the slide rheostat RP 1; the negative power supply end of the operational amplifier LM1 is connected with the emitter of the triode T5, and the output end of the operational amplifier LM1 is connected with one end of the resistor R4; the other end of the resistor R4 is connected with the base electrode of the compound triode T6; the emitter of the compound triode T6 is connected with the first fixed end of the slide rheostat RP 1; the second fixed end of the slide rheostat RP1 is connected with one end of the resistor R5; the collector of the compound triode T6 is respectively connected with one end of a resistor R10 and one end of a resistor R11; the other end of the resistor R10 is connected with the first fixed end of the slide rheostat RP 3; the second fixed end of the slide rheostat RP3 is connected with the other end of the resistor R8, and the moving ends of the slide rheostat RP3 are respectively connected with one end of the capacitor C1 and the non-inverting input end of the operational amplifier LM 2; the inverting input end of the operational amplifier LM2 is respectively connected with the other end of the capacitor C1, the other end of the resistor R11 and one end of the resistor R9; the other end of the resistor R9 is connected with one end of a resistor R15; the other end of the resistor R15 is respectively connected with the other end of the resistor R16, the movable end of the slide rheostat RP2, the second fixed end of the slide rheostat RP2, the negative electrode of the diode D5, the positive power end of the operational amplifier LM2, one end of the resistor R12 and one end of the resistor R13; the output end of the operational amplifier LM2 is connected with one end of a resistor R14; the other end of the resistor R14 is connected with the cathode of a diode D6; the anode of the diode D6 is connected with the cathode of the diode D7; the anode of the diode D7 is connected with the cathode of the diode D8; the anode of the diode D8 is respectively connected with the other end of the resistor R12 and the base of the diode T2; the emitter of the diode T2 is connected with the other end of the resistor R13; the drain electrode of the triode T3 is respectively connected with the anode of the diode D5 and the base electrode of the triode T4; the source electrode of the triode T3 is connected with one end of the resistor R6; the collector of the triode T4 is connected with one end of a resistor R7; and the collector of the triode T2, the other end of the resistor R3, the other end of the resistor R5, the other end of the resistor R6, the other end of the resistor R7, the positive power supply end of the operational amplifier LM1, the negative electrode of the diode D4 and the positive electrode of the diode D1 are all connected with the power supply end of the water circulation temperature control system.

7. The calibration platform water circulation temperature control system according to claim 1, wherein the first, second and third temperature and pressure sensors (7-1, 7-2, 7-3) are identical in structure and each comprise a temperature sensor and a pressure sensor;

the temperature sensor comprises resistors R17-R18, a grounding resistor R19, a resistor R20, a grounding capacitor C2-C3, a voltage reference chip IC1 with the model of REF3030, an amplification chip IC2 with the model of AD623 and a temperature sensing chip RT1 with the model of PT 100;

the VIN pin of the chip IC1 is respectively connected with the power supply end of the water circulation temperature control system and the grounding capacitor C3; the GND pin of the chip IC1 is grounded; a VOUT pin of the chip IC1 is respectively connected with one end of a resistor R17 and one end of a resistor R18; the B1 pin of the chip RT1 is connected with the + IN pin of the chip IC 2; the B2 pin of the chip RT1 is connected with the other end of the resistor R17; the A pin of the chip RT1 is grounded; the-RG pin of the chip IC2 is connected with one end of a resistor R20; the-IN pin of the chip IC2 is respectively connected with the other end of the resistor R18 and the grounding resistor R19; the-Vs pin of the chip IC2 is grounded; the + RG pin of the chip IC2 is connected with the other end of the resistor R20; the + Vs pin of the chip IC2 is respectively connected with a grounding capacitor C2 and a power supply end of a water circulation temperature control system; the REF pin of the chip IC2 is grounded;

the amplifying circuit of the pressure sensor comprises resistors R21-R32, slide rheostats RP4-RP5, capacitors C7-C9, triodes Q1-Q2, amplifiers A1-A4 and a diode D9;

the 1 st pin of the amplifier A1 is respectively connected with one end of a resistor R21 and one end of a resistor R22, and the 2 nd pin thereof is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R21 is respectively connected with the other end of the resistor R23, the first fixed end of the slide rheostat RP5, one end of the capacitor C9, the emitting electrode of the triode Q2 and one end of the resistor R31; the other end of the resistor R22 is respectively connected with the second fixed end of the slide rheostat RP5, the other end of the resistor R24, one end of the capacitor C8, the emitter of the triode Q1, one end of the resistor R32, the 1 st pin of the amplifier A3 and one end of the capacitor C7; the 4 th pin of the amplifier A1 is connected with the movable end of a slide rheostat RP 5; the 3 rd pin of the amplifier A1 is connected with the first fixed end of a slide rheostat RP 4; the movable end of the slide rheostat RP4 is connected with one end of the resistor R27; the other end of the resistor R27 is connected with the 2 nd pin of the amplifier A2; the 1 st pin of the amplifier A2 is respectively connected with one end of a resistor R25 and one end of a resistor R26; the base electrode of the triode Q1 is connected with one end of the resistor R29; the other end of the resistor R29 is respectively connected with the 3 rd pin of the amplifier A3 and the other end of the capacitor C7; the 1 st pin of the amplifier A4 is respectively connected with the other end of the resistor R32, one end of the capacitor C10 and the other end of the resistor R31, and the 3 rd pin of the amplifier A4 is respectively connected with the other end of the capacitor C10 and one end of the resistor R30; the other end of the resistor R30 is connected with the base electrode of the triode Q2; the 2 nd pin of the amplifier A3 is respectively connected with one end of a resistor R28 and the cathode of a diode D9; the collector of the triode Q2, the second fixed end of the sliding rheostat RP4, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R28, the anode of the diode D9, the collector of the triode Q1, the other end of the resistor R25, the other end of the resistor R26 and the 3 rd pin of the amplifier A2 are connected.

Technical Field

The invention belongs to the technical field of calibration platform temperature control, and particularly relates to a calibration platform water circulation temperature control system.

Background

At present, mineral resources in the shallow part of the earth are gradually exhausted, resource development continuously moves to the deep part of the earth, the coal mining depth reaches 1500m, the geothermal mining depth exceeds 3000m, the metal mining depth exceeds 4350m, the oil and gas resource mining depth reaches 7500m, and deep resource mining becomes a normal state.

The deep rock characteristics are proved, powerful support is provided for deep marching, the deep environment must be restored in a laboratory before deep in-situ fidelity coring work of actual engineering, and the reliability of a coring system is tested. The existing temperature and pressure control device for the reduction in-situ environment experiment basically stays in a shallow rock mechanics experiment stage, even a normal temperature and pressure stage; meanwhile, the condition of stress-temperature-osmotic pressure three-field coupling is rarely considered, and a core drilling or mechanical experiment may be started when each point in the sample is not uniform, so that large deviation is caused, the in-situ environment of the rock cannot be correctly restored, and the obtained experimental conclusion or the taken core has errors with the actual condition.

In a deep ground environment, the most obvious difference from a shallow part is the environment with high temperature and high pressure, the temperature and pressure environment can reach 100 ℃ and more than 100MPa, in order to research deep in-situ coring, various properties under the condition of deep in-situ temperature and pressure must be known, and the deep in-situ fidelity coring simulation cabin provides a temperature control system. In some simulated coring or in-situ experiments, a temperature and pressure loading path is very important, particularly in a temperature and pressure environment of 100+ DEG C and 100+ MPa in deep ground, if the temperature and pressure loading path is inconsistent, water body gasification can be caused, and great disturbance is caused to the whole experiment system.

Disclosure of Invention

The invention aims to solve the problem of water circulation control of temperature in a simulation cabin, and provides a calibration platform water circulation temperature control system which can keep the temperature and pressure applying process stable and prevent the temperature and pressure environment from exceeding the single control limit due to the temperature and pressure coupling effect while ensuring that the phase change of fluid is not generated in the temperature and pressure applying process.

The technical scheme of the invention is as follows: a calibration platform water circulation temperature control system comprises a cooling pool, a sewage pool, a cooling coil, a heating pipeline, a first high-frequency induction coil, a second high-frequency induction coil, a low-pressure pump, a high-pressure pump, a first temperature and pressure sensor, a second temperature and pressure sensor, a third temperature and pressure sensor, a first pressure transmitter, a second pressure transmitter, a first hydraulic control valve, a second hydraulic control valve, a third hydraulic control valve, a fourth hydraulic control valve, a first safety valve, a second safety valve, a third safety valve, a simulation cabin body, a first normal temperature pipeline, a second normal temperature pipeline and a third normal temperature pipeline;

the cooling coil is fixedly arranged in the cooling pool; the input end of the cooling coil is fixedly connected with the simulation cabin body through a second normal temperature pipeline, and the output end of the cooling coil is fixedly arranged in the sewage pool; one end of the heating pipeline and one end of the third normal-temperature pipeline are both fixedly arranged in the cooling pond; a first high-frequency induction coil, a low-pressure pump, a first temperature and pressure sensor and a second high-frequency induction coil are sequentially and fixedly arranged on the outer wall of the heating pipeline; the other end of the heating pipeline is fixedly connected with one end of the first normal-temperature pipeline through a high-pressure pump; a second hydraulic control valve, a first safety valve, a first pressure transmitter and a second temperature and pressure sensor are fixedly arranged on the outer wall of a first branch of the first normal temperature pipeline, and a third hydraulic control valve, a second safety valve and a second pressure transmitter are fixedly arranged on the outer wall of a second branch of the first normal temperature pipeline; the other end of the first branch and the other end of the second branch are both fixedly connected with the simulation cabin body; the high-pressure pump is also fixedly connected with one end of a third normal-temperature pipeline; the other end of the third normal-temperature pipeline is fixedly arranged in the cooling pool; a first hydraulic control valve and a third temperature and pressure sensor are fixedly arranged on the outer wall of the third normal temperature pipeline; a fourth hydraulic control valve is fixedly arranged on the outer wall of the second normal-temperature pipeline;

the low-pressure pump, the high-pressure pump, the first pressure transmitter and the second pressure transmitter are all in communication connection with the computer.

The invention has the beneficial effects that:

(1) the water circulation temperature control system can accurately restore the occurrence environment of deep high temperature and high pressure in the deep in-situ high temperature and high pressure environment simulation cabin, and temperature and pressure regulation and control are carried out through various sensors; simultaneously, add filtration system, filter the silt in the liquid through simulation under-deck sample, prevent to cause the destruction to other systems.

(2) The simulation cabin is taken as a main body, the temperature of the liquid in the cabin body and each pipeline is controlled by the water circulation temperature control system through the heat insulation device of the cabin body and the liquid inlet and outlet pipeline of the drill rod section at the upper part of the cabin body, and the real-time in-situ environment simulation is realized by adopting a reasonable temperature and pressure control implementation scheme.

(3) According to the invention, through the automatic data acquisition system and the computer technology, the safety of the high-temperature and high-pressure pipeline is ensured, and meanwhile, a reliable temperature and pressure control system is provided for the deep in-situ high-temperature and high-pressure environment simulation cabin device, so that basic pre-research conditions can be provided for deep in-situ rock mechanics and deep science front-end exploration.

Further, a filtering system is arranged in the sewage tank.

The beneficial effects of the further scheme are as follows: in the invention, the filtering system can filter out silt in the liquid passing through the sample in the simulation cabin, thereby preventing other systems from being damaged.

Further, the outer walls of the heating pipeline, the first normal temperature pipeline, the second normal temperature pipeline and the third normal temperature pipeline are all fixedly provided with heat insulation layers.

The beneficial effects of the further scheme are as follows: in the invention, the outer surface of the liquid pipeline is insulated by the heat insulation layer, so that the heat loss is reduced, and the heat utilization rate is improved.

Further, the first high-frequency induction coil and the low-pressure pump form a primary heating and pressurizing unit which is used for heating normal-temperature normal-pressure water to 90 ℃ and pressurizing the water to 5 MPa.

Further, the second high-frequency induction coil and the high-pressure pump form a secondary heating and pressurizing unit which is used for heating the normal-temperature normal-pressure water to 150 ℃ and pressurizing the normal-temperature normal-pressure water to 140 MPa.

The beneficial effects of the further scheme are as follows: in the present invention, a high-frequency induction heating coil heating method is adopted, and high-frequency induction is performed by heating a conductor itself by using an induction current (eddy current loss) generated by the conductor under the action of a high-frequency magnetic field and hysteresis loss due to the action of a magnetic field in the conductor. Its advantages are high heat efficiency, low power and saving energy.

Furthermore, the first pressure transmitter and the second pressure transmitter have the same structure and respectively comprise resistors R1-R16, slide rheostats RP1-RP3, a capacitor C1, diodes D1-D8, triodes T1-T5, a composite triode T6 and operational amplifiers LM1-LM 2;

the cathode of the diode D1 is connected to the drain of the transistor T1, the collector of the transistor T5, one end of the resistor R8, one end of the resistor R16 and the first stationary end of the slide rheostat RP 2; the source of the triode T1 is connected with one end of the resistor R1; the grid electrode of the triode T1 is respectively connected with the other end of the resistor R1, the negative electrode of the diode D2 and the base electrode of the triode T5; the anode of the diode D2 is connected to the cathode of the diode D3 and one end of the resistor R2; the anode of the diode D3 is connected with the anode of the diode D4; the other end of the resistor R2 is respectively connected with one end of a resistor R3 and the non-inverting input end of the operational amplifier LM 1; the inverting input end of the operational amplifier LM1 is connected with the moving end of the slide rheostat RP 1; the negative power supply end of the operational amplifier LM1 is connected with the emitter of the triode T5, and the output end of the operational amplifier LM1 is connected with one end of the resistor R4; the other end of the resistor R4 is connected with the base electrode of the compound triode T6; the emitter of the compound triode T6 is connected with the first fixed end of the slide rheostat RP 1; the second fixed end of the slide rheostat RP1 is connected with one end of the resistor R5; the collector of the compound triode T6 is respectively connected with one end of the resistor R10 and one end of the resistor R11; the other end of the resistor R10 is connected with the first fixed end of the slide rheostat RP 3; the second fixed end of the slide rheostat RP3 is connected with the other end of the resistor R8, and the moving ends of the slide rheostat RP3 are respectively connected with one end of the capacitor C1 and the non-inverting input end of the operational amplifier LM 2; the inverting input end of the operational amplifier LM2 is respectively connected with the other end of the capacitor C1, the other end of the resistor R11 and one end of the resistor R9; the other end of the resistor R9 is connected with one end of the resistor R15; the other end of the resistor R15 is respectively connected with the other end of the resistor R16, the movable end of the slide rheostat RP2, the second fixed end of the slide rheostat RP2, the negative electrode of the diode D5, the positive power end of the operational amplifier LM2, one end of the resistor R12 and one end of the resistor R13; the output end of the operational amplifier LM2 is connected with one end of a resistor R14; the other end of the resistor R14 is connected with the cathode of the diode D6; the anode of the diode D6 is connected with the cathode of the diode D7; the anode of the diode D7 is connected with the cathode of the diode D8; the anode of the diode D8 is respectively connected with the other end of the resistor R12 and the base of the diode T2; the emitter of the diode T2 is connected with the other end of the resistor R13; the drain electrode of the triode T3 is respectively connected with the anode of the diode D5 and the base electrode of the triode T4; the source of the triode T3 is connected with one end of the resistor R6; the collector of the triode T4 is connected with one end of the resistor R7; the collector of the triode T2, the other end of the resistor R3, the other end of the resistor R5, the other end of the resistor R6, the other end of the resistor R7, the positive power supply end of the operational amplifier LM1, the negative electrode of the diode D4 and the positive electrode of the diode D1 are all connected with the power supply end of the water circulation temperature control system.

Further, the first temperature and pressure sensor, the second temperature and pressure sensor and the third temperature and pressure sensor have the same structure and respectively comprise a temperature sensor and a pressure sensor;

the temperature sensor comprises resistors R17-R18, a grounding resistor R19, a resistor R20, a grounding capacitor C2-C3, a voltage reference chip IC1 with the model of REF3030, an amplification chip IC2 with the model of AD623 and a temperature sensing chip RT1 with the model of PT 100;

a VIN pin of the chip IC1 is respectively connected with a power supply end of the water circulation temperature control system and a grounding capacitor C3; the GND pin of the chip IC1 is grounded; a VOUT pin of the chip IC1 is respectively connected with one end of the resistor R17 and one end of the resistor R18; the B1 pin of the chip RT1 is connected with the + IN pin of the chip IC 2; the B2 pin of the chip RT1 is connected with the other end of the resistor R17; pin A of the chip RT1 is grounded; the-RG pin of the chip IC2 is connected with one end of the resistor R20; the-IN pin of the chip IC2 is respectively connected with the other end of the resistor R18 and the grounding resistor R19; the-Vs pin of chip IC2 is grounded; the + RG pin of the chip IC2 is connected with the other end of the resistor R20; a + Vs pin of the chip IC2 is respectively connected with a grounding capacitor C2 and a power supply end of the water circulation temperature control system; the REF pin of chip IC2 is grounded;

the amplifying circuit of the pressure sensor comprises resistors R21-R32, slide rheostats RP4-RP5, capacitors C7-C9, triodes Q1-Q2, amplifiers A1-A4 and a diode D9;

the 1 st pin of the amplifier A1 is respectively connected with one end of a resistor R21 and one end of a resistor R22, and the 2 nd pin thereof is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R21 is respectively connected with the other end of the resistor R23, the first fixed end of the slide rheostat RP5, one end of the capacitor C9, the emitter of the triode Q2 and one end of the resistor R31; the other end of the resistor R22 is respectively connected with the second fixed end of the slide rheostat RP5, the other end of the resistor R24, one end of the capacitor C8, the emitter of the triode Q1, one end of the resistor R32, the 1 st pin of the amplifier A3 and one end of the capacitor C7; the 4 th pin of the amplifier A1 is connected with the movable end of the slide rheostat RP 5; the 3 rd pin of the amplifier A1 is connected with the first fixed end of the slide rheostat RP 4; the movable end of the slide rheostat RP4 is connected with one end of the resistor R27; the other end of the resistor R27 is connected with the 2 nd pin of the amplifier A2; the 1 st pin of the amplifier A2 is respectively connected with one end of a resistor R25 and one end of a resistor R26; the base of the triode Q1 is connected with one end of the resistor R29; the other end of the resistor R29 is respectively connected with the 3 rd pin of the amplifier A3 and the other end of the capacitor C7; the 1 st pin of the amplifier A4 is respectively connected with the other end of the resistor R32, one end of the capacitor C10 and the other end of the resistor R31, and the 3 rd pin of the amplifier A4 is respectively connected with the other end of the capacitor C10 and one end of the resistor R30; the other end of the resistor R30 is connected with the base electrode of the triode Q2; the 2 nd pin of the amplifier A3 is respectively connected with one end of a resistor R28 and the cathode of a diode D9; the collector of the transistor Q2, the second fixed end of the sliding rheostat RP4, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R28, the anode of the diode D9, the collector of the transistor Q1, the other end of the resistor R25, the other end of the resistor R26 and the 3 rd pin of the amplifier A2 are connected.

The beneficial effects of the further scheme are as follows: in the invention, the temperature and pressure sensor can be arranged at the water outlet end of the water pool and the ultrahigh pressure pump, the water inlet of the cabin body, the inlet of the lower section drill rod cabin, the upper part of the sample cabin close to the sample and the lower part of the sample cabin close to the sample, so as to complete the temperature measurement and control of the water in the cabin. Meanwhile, the cabin body is installed on the cabin wall in a mode of not penetrating through the cabin wall, and the safety of the cabin body is guaranteed.

Drawings

FIG. 1 is a block diagram of a water cycle temperature control system;

FIG. 2 is a circuit diagram of a pressure transmitter;

FIG. 3 is a circuit diagram of a temperature sensor;

FIG. 4 is a circuit diagram of an amplifying circuit in the pressure sensor;

in the figure, 1, a cooling pool; 2. a sewage tank; 3. a cooling coil; 4. heating the pipeline; 5-1, a first high-frequency induction coil; 5-2, a second high-frequency induction coil; 6-1, a low-pressure pump; 6-2, a high-pressure pump; 7-1, a first temperature and pressure sensor; 7-2, a second temperature and pressure sensor; 7-3, a third temperature and pressure sensor; 8-1, a first pressure transmitter; 8-2, a second pressure transmitter; 9-1, a first hydraulic control valve; 9-2, a second hydraulic control valve; 9-3, a third hydraulic control valve; 9-4, a fourth hydraulic control valve; 10-1, a first safety valve; 10-2, a second safety valve; 10-3, a third safety valve; 11. simulating a cabin body; 12-1, a first normal temperature pipeline; 12-2, a second normal temperature pipeline; 12-3 and a third normal temperature pipeline.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings.

In the embodiment of the invention, the calibration platform is a short name for a deep in-situ fidelity coring five-guarantee capability calibration platform, and the simulation cabin is a short name for a deep in-situ high-temperature high-pressure environment simulation cabin.

As shown in figure 1, the invention provides a calibration platform water circulation temperature control system, which comprises a cooling pool 1, a sewage pool 2, a cooling coil 3, a heating pipeline 4, a first high-frequency induction coil 5-1, a second high-frequency induction coil 5-2, a low-pressure pump 6-1, a high-pressure pump 6-2, a first temperature-pressure sensor 7-1, a second temperature-pressure sensor 7-2, a third temperature-pressure sensor 7-3, a first pressure transmitter 8-1, a second pressure transmitter 8-2, a first hydraulic control valve 9-1, a second hydraulic control valve 9-2, a third hydraulic control valve 9-3, a fourth hydraulic control valve 9-4, a first safety valve 10-1, a second safety valve 10-2, a third safety valve 10-3, a simulation cabin 11, a first normal-temperature pipeline 12-1, a second normal-1, a third safety valve 9-3, a third, A second normal temperature pipeline 12-2 and a third normal temperature pipeline 12-3; a fourth hydraulic control valve 9-4 is fixedly arranged on the outer wall of the second normal-temperature pipeline 12-2;

the cooling coil 3 is fixedly arranged in the cooling pool 1; the input end of the cooling coil 3 is fixedly connected with the simulation cabin 11 through a second normal temperature pipeline 12-2, and the output end of the cooling coil is fixedly arranged in the sewage pool 1; one end of the heating pipeline 4 and one end of the third normal-temperature pipeline 12-3 are both fixedly arranged in the cooling pond 1; a first high-frequency induction coil 5-1, a low-pressure pump 6-1, a first temperature and pressure sensor 7-1 and a second high-frequency induction coil 5-2 are sequentially and fixedly arranged on the outer wall of the heating pipeline 4; the other end of the heating pipeline 4 is fixedly connected with one end of a first normal temperature pipeline 12-1 through a high-pressure pump 6-2; a second hydraulic control valve 9-2, a first safety valve 10-1, a first pressure transmitter 8-1 and a second temperature and pressure sensor 7-2 are fixedly arranged on the outer wall of a first branch of the first normal temperature pipeline 12-1, and a third hydraulic control valve 9-3, a second safety valve 10-2 and a second pressure transmitter 8-2 are fixedly arranged on the outer wall of a second branch; the other end of the first branch and the other end of the second branch are both fixedly connected with the simulation cabin body 11; the high-pressure pump 6-2 is also fixedly connected with one end of a third normal-temperature pipeline 12-3; the other end of the third normal-temperature pipeline 12-3 is fixedly arranged in the cooling pool 1; a first hydraulic control valve 9-1 and a third temperature and pressure sensor 7-3 are fixedly arranged on the outer wall of the third normal temperature pipeline 12-3;

the low-pressure pump 6-1, the high-pressure pump 6-2, the first pressure transmitter 8-1 and the second pressure transmitter 8-2 are all in communication connection with a computer.

In the embodiment of the present invention, as shown in fig. 1, a filtering system is installed in the wastewater tank 2.

In the invention, the filtering system can filter out silt in the liquid passing through the sample in the simulation cabin, thereby preventing other systems from being damaged.

In the embodiment of the invention, as shown in fig. 1, heat insulation layers are fixedly arranged on the outer walls of the heating pipeline 4, the first normal temperature pipeline 12-1, the second normal temperature pipeline 12-2 and the third normal temperature pipeline 12-3.

In the invention, the outer surface of the liquid pipeline is insulated by the heat insulation layer, so that the heat loss is reduced, and the heat utilization rate is improved.

In the embodiment of the present invention, as shown in fig. 1, the first high-frequency induction coil 5-1 and the low-pressure pump 6-1 form a primary heating and pressurizing unit for heating water at normal temperature and normal pressure to 90 ℃ and pressurizing the water to 5 MPa.

In the embodiment of the present invention, as shown in fig. 1, the second high-frequency induction coil 5-2 and the high-pressure pump 6-2 form a secondary heating and pressurizing unit for heating water at normal temperature and normal pressure to 150 ℃ and pressurizing the water to 140 MPa.

In the present invention, a high-frequency induction heating coil heating method is adopted, and high-frequency induction is performed by heating a conductor itself by using an induction current (eddy current loss) generated by the conductor under the action of a high-frequency magnetic field and hysteresis loss due to the action of a magnetic field in the conductor. Its advantages are high heat efficiency, low power and saving energy.

In the embodiment of the invention, as shown in fig. 2, the first pressure transmitter 8-1 and the second pressure transmitter 8-2 have the same structure, and both comprise resistors R1-R16, slide varistors RP1-RP3, a capacitor C1, diodes D1-D8, triodes T1-T5, a compound triode T6 and operational amplifiers LM1-LM 2;

the cathode of the diode D1 is connected to the drain of the transistor T1, the collector of the transistor T5, one end of the resistor R8, one end of the resistor R16 and the first stationary end of the slide rheostat RP 2; the source of the triode T1 is connected with one end of the resistor R1; the grid electrode of the triode T1 is respectively connected with the other end of the resistor R1, the negative electrode of the diode D2 and the base electrode of the triode T5; the anode of the diode D2 is connected to the cathode of the diode D3 and one end of the resistor R2; the anode of the diode D3 is connected with the anode of the diode D4; the other end of the resistor R2 is respectively connected with one end of a resistor R3 and the non-inverting input end of the operational amplifier LM 1; the inverting input end of the operational amplifier LM1 is connected with the moving end of the slide rheostat RP 1; the negative power supply end of the operational amplifier LM1 is connected with the emitter of the triode T5, and the output end of the operational amplifier LM1 is connected with one end of the resistor R4; the other end of the resistor R4 is connected with the base electrode of the compound triode T6; the emitter of the compound triode T6 is connected with the first fixed end of the slide rheostat RP 1; the second fixed end of the slide rheostat RP1 is connected with one end of the resistor R5; the collector of the compound triode T6 is respectively connected with one end of the resistor R10 and one end of the resistor R11; the other end of the resistor R10 is connected with the first fixed end of the slide rheostat RP 3; the second fixed end of the slide rheostat RP3 is connected with the other end of the resistor R8, and the moving ends of the slide rheostat RP3 are respectively connected with one end of the capacitor C1 and the non-inverting input end of the operational amplifier LM 2; the inverting input end of the operational amplifier LM2 is respectively connected with the other end of the capacitor C1, the other end of the resistor R11 and one end of the resistor R9; the other end of the resistor R9 is connected with one end of the resistor R15; the other end of the resistor R15 is respectively connected with the other end of the resistor R16, the movable end of the slide rheostat RP2, the second fixed end of the slide rheostat RP2, the negative electrode of the diode D5, the positive power end of the operational amplifier LM2, one end of the resistor R12 and one end of the resistor R13; the output end of the operational amplifier LM2 is connected with one end of a resistor R14; the other end of the resistor R14 is connected with the cathode of the diode D6; the anode of the diode D6 is connected with the cathode of the diode D7; the anode of the diode D7 is connected with the cathode of the diode D8; the anode of the diode D8 is respectively connected with the other end of the resistor R12 and the base of the diode T2; the emitter of the diode T2 is connected with the other end of the resistor R13; the drain electrode of the triode T3 is respectively connected with the anode of the diode D5 and the base electrode of the triode T4; the source of the triode T3 is connected with one end of the resistor R6; the collector of the triode T4 is connected with one end of the resistor R7; the collector of the triode T2, the other end of the resistor R3, the other end of the resistor R5, the other end of the resistor R6, the other end of the resistor R7, the positive power supply end of the operational amplifier LM1, the negative electrode of the diode D4 and the positive electrode of the diode D1 are all connected with the power supply end of the water circulation temperature control system.

In the embodiment of the invention, as shown in fig. 1, the first temperature and pressure sensor 7-1, the second temperature and pressure sensor 7-2 and the third temperature and pressure sensor 7-3 have the same structure and comprise temperature sensors and pressure sensors;

as shown in fig. 3, the temperature sensor comprises resistors R17-R18, a grounding resistor R19, a resistor R20, a grounding capacitor C2-C3, a voltage reference chip IC1 with the model of REF3030, an amplifying chip IC2 with the model of AD623, and a temperature sensing chip RT1 with the model of PT 100;

a VIN pin of the chip IC1 is respectively connected with a power supply end of the water circulation temperature control system and a grounding capacitor C3; the GND pin of the chip IC1 is grounded; a VOUT pin of the chip IC1 is respectively connected with one end of the resistor R17 and one end of the resistor R18; the B1 pin of the chip RT1 is connected with the + IN pin of the chip IC 2; the B2 pin of the chip RT1 is connected with the other end of the resistor R17; pin A of the chip RT1 is grounded; the-RG pin of the chip IC2 is connected with one end of the resistor R20; the-IN pin of the chip IC2 is respectively connected with the other end of the resistor R18 and the grounding resistor R19; the-Vs pin of chip IC2 is grounded; the + RG pin of the chip IC2 is connected with the other end of the resistor R20; a + Vs pin of the chip IC2 is respectively connected with a grounding capacitor C2 and a power supply end of the water circulation temperature control system; the REF pin of chip IC2 is grounded;

as shown in FIG. 4, the amplifying circuit of the pressure sensor comprises resistors R21-R32, slide rheostats RP4-RP5, capacitors C7-C9, triodes Q1-Q2, amplifiers A1-A4 and a diode D9;

the 1 st pin of the amplifier A1 is respectively connected with one end of a resistor R21 and one end of a resistor R22, and the 2 nd pin thereof is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R21 is respectively connected with the other end of the resistor R23, the first fixed end of the slide rheostat RP5, one end of the capacitor C9, the emitter of the triode Q2 and one end of the resistor R31; the other end of the resistor R22 is respectively connected with the second fixed end of the slide rheostat RP5, the other end of the resistor R24, one end of the capacitor C8, the emitter of the triode Q1, one end of the resistor R32, the 1 st pin of the amplifier A3 and one end of the capacitor C7; the 4 th pin of the amplifier A1 is connected with the movable end of the slide rheostat RP 5; the 3 rd pin of the amplifier A1 is connected with the first fixed end of the slide rheostat RP 4; the movable end of the slide rheostat RP4 is connected with one end of the resistor R27; the other end of the resistor R27 is connected with the 2 nd pin of the amplifier A2; the 1 st pin of the amplifier A2 is respectively connected with one end of a resistor R25 and one end of a resistor R26; the base of the triode Q1 is connected with one end of the resistor R29; the other end of the resistor R29 is respectively connected with the 3 rd pin of the amplifier A3 and the other end of the capacitor C7; the 1 st pin of the amplifier A4 is respectively connected with the other end of the resistor R32, one end of the capacitor C10 and the other end of the resistor R31, and the 3 rd pin of the amplifier A4 is respectively connected with the other end of the capacitor C10 and one end of the resistor R30; the other end of the resistor R30 is connected with the base electrode of the triode Q2; the 2 nd pin of the amplifier A3 is respectively connected with one end of a resistor R28 and the cathode of a diode D9; the collector of the transistor Q2, the second fixed end of the sliding rheostat RP4, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R28, the anode of the diode D9, the collector of the transistor Q1, the other end of the resistor R25, the other end of the resistor R26 and the 3 rd pin of the amplifier A2 are connected.

In the invention, the temperature and pressure sensor can be arranged at the water outlet end of the water pool and the ultrahigh pressure pump, the water inlet of the cabin body, the inlet of the lower section drill rod cabin, the upper part of the sample cabin close to the sample and the lower part of the sample cabin close to the sample, so as to complete the temperature measurement and control of the water in the cabin. Meanwhile, the cabin body is installed on the cabin wall in a mode of not penetrating through the cabin wall, and the safety of the cabin body is guaranteed.

The working principle and the process of the invention are as follows: normal temperature and normal pressure water is heated to 90 ℃ from the cooling tank 1 through the heating pipeline 4; feeding into a low-pressure pump 6-1, and pressurizing to 5MPa (corresponding to the boiling point of water 264 ℃); heating to 150 deg.C, and pressurizing to 140MPa with high-pressure pump 6-2; entering a coring device to drive a coring drill and a pipeline in the cabin; liquid flows out from the lower part of the drill rod part after passing through the pipeline of the cabin body, enters the cooling tank 1 through the cooling coil 3 for cooling, flows into the sewage tank 2, then enters the cooling tank 1 through the filtering system in the sewage tank 2, and enters the next cycle. The whole control mode of the system adopts a remote computer to automatically control the temperature, can set the upper limit line value of the temperature to achieve accurate temperature control, and is provided with a first hydraulic control valve 9-1, a second hydraulic control valve 9-2, a third hydraulic control valve 9-3, a fourth hydraulic control valve 9-4, a first safety valve 10-1, a second safety valve 10-2 and a third safety valve 10-3 to respectively control the safety of a pipeline and the flow direction of liquid.

The invention has the beneficial effects that:

(1) the water circulation temperature control system can accurately restore the occurrence environment of deep high temperature and high pressure in the deep in-situ high temperature and high pressure environment simulation cabin, and temperature and pressure regulation and control are carried out through various sensors; simultaneously, add filtration system, filter the silt in the liquid through simulation under-deck sample, prevent to cause the destruction to other systems.

(2) The simulation cabin is taken as a main body, the temperature of the liquid in the cabin body and each pipeline is controlled by the water circulation temperature control system through the heat insulation device of the cabin body and the liquid inlet and outlet pipeline of the drill rod section at the upper part of the cabin body, and the real-time in-situ environment simulation is realized by adopting a reasonable temperature and pressure control implementation scheme.

(3) According to the invention, through the automatic data acquisition system and the computer technology, the safety of the high-temperature and high-pressure pipeline is ensured, and meanwhile, a reliable temperature and pressure control system is provided for the deep in-situ high-temperature and high-pressure environment simulation cabin device, so that basic pre-research conditions can be provided for deep in-situ rock mechanics and deep science front-end exploration.

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.