CN107270995B - High-temperature liquid metal multi-liquid-level measuring device and measuring method - Google Patents
High-temperature liquid metal multi-liquid-level measuring device and measuring method Download PDFInfo
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- CN107270995B CN107270995B CN201710599792.2A CN201710599792A CN107270995B CN 107270995 B CN107270995 B CN 107270995B CN 201710599792 A CN201710599792 A CN 201710599792A CN 107270995 B CN107270995 B CN 107270995B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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Abstract
The invention discloses a high-temperature liquid metal multi-liquid-level measuring device and a measuring method, which comprises a liquid metal tank and a heat conducting oil tank, wherein the heat conducting oil tank is led out of a heat conducting oil pipeline, the heat conducting oil pipeline sequentially passes through an oil pump and a valve and then returns to the heat conducting oil tank to form a heat conducting oil circulating loop, the heat conducting oil pipeline penetrates through the liquid metal tank, a plurality of thermocouples are arranged in the heat conducting oil pipeline, and lead-out wires of the thermocouples are led out of the heat conducting oil tank. The invention can detect different metal liquid levels in an effective space range, greatly improves the accuracy of liquid metal liquid level measurement, and has single sealing requirement because the part to be sealed is only the connecting point between the heat conduction oil pipeline and the liquid metal tank, thereby greatly reducing the difficulty of sealing performance and being more widely applied to the liquid level measurement of the liquid metal.
Description
Technical Field
The invention relates to the technical field of liquid metal measuring equipment, in particular to a device applied to measuring a plurality of liquid levels in a high-temperature liquid metal tank body and a using method thereof.
background
The level of liquid metal in the liquid metal tank reflects the amount of liquid metal and is an important parameter in the operation of the system. If the liquid level in the tank body is too low, gas can enter the electromagnetic pump, so that the electromagnetic pump cannot work normally, the heat productivity is increased, the cooling capacity is reduced, and the coil of the electromagnetic pump is damaged; if the liquid level is too high, the tank top sealing device or other detection control equipment can be in direct contact with the high-temperature liquid metal to fail. Therefore, accurate measurement of the liquid level in the liquid metal loop tank is a necessary prerequisite for safe and normal operation of the system. There is therefore a need for a device that can perform high temperature liquid metal level measurements. There are many different techniques for level measurement.
For example, chinese patent 99202908.2 provides a float-type liquid level measuring instrument, which mainly comprises a float, a rope tying the float, a measuring wheel, a large coil spring wheel coaxially mounted with the measuring wheel, a signal conversion output device, and a coil spring with one end wound around the large coil spring wheel and the other end wound around the small coil spring wheel. However, the mechanical structure is more, the requirements for high temperature and high sealing cannot be met, and the problem of high corrosivity of liquid sodium cannot be solved. And therefore unsuitable for application in liquid metal systems.
for another example, chinese patent 2011102783125 provides a liquid metal level probe and a method for using the same, which includes a high level probe, a low level probe, a stainless steel sleeve, a corundum tube and necessary sealing and insulating components, and is a switch type liquid level detection device based on liquid metal conductivity. The device can be effectual detect the internal liquid level of liquid metal tank, and the result is easily observed, reasonable in design, compact structure is fit for assembling on liquid metal container. However, the probe can only detect two specific liquid levels, and cannot measure different liquid levels in the tank body more accurately. Moreover, the sealing and insulating part is made of polytetrafluoroethylene, and the sealing and insulating properties of the sealing and insulating part can be damaged along with the increase of the operating temperature of the system, so that the probe fails. And therefore not suitable for systems that require the measurement of multiple levels within the body of a high temperature liquid metal tank.
Disclosure of Invention
The invention aims to provide a high-temperature liquid metal multi-liquid-level measuring device and a measuring method, which solve the problem that the measuring device and the measuring method in the prior art cannot meet the liquid metal liquid level measurement.
the invention is realized by the following technical scheme:
The high-temperature liquid metal multi-liquid-level measuring device comprises a liquid metal tank and a heat conduction oil tank, wherein a heat conduction oil pipeline is led out of the heat conduction oil tank, the heat conduction oil pipeline sequentially passes through an oil pump and a valve and then returns to the heat conduction oil tank to form a heat conduction oil circulation loop, the heat conduction oil pipeline penetrates through the liquid metal tank, a plurality of thermocouples are arranged in the heat conduction oil pipeline, and lead-out wires of the thermocouples are led out of the heat conduction oil tank. In the prior art, the measurement of the metal liquid level is to connect a high liquid level probe and a high liquid level indicator lamp in series and then connect the high liquid level probe and the high liquid level indicator lamp with the positive pole of a direct current power supply; the low liquid level probe is connected with the low liquid level indicator lamp in series and then is connected with the positive electrode of the direct current power supply; the cathode of the direct current power supply is connected with the cylinder; when the liquid level of the liquid metal rises to be contacted with the lower end of the low liquid level probe, the low liquid level probe is communicated with the cylinder, namely the branch of the low liquid level probe is conducted, and the low liquid level indicator lamp is on at the moment to indicate that the liquid level reaches the indicating height of the low liquid level probe; along with the rise of liquid level, when the liquid level reaches the lower end of the high liquid level probe, the high liquid level probe is communicated with the cylinder, the high liquid level probe branch is conducted, the high liquid level indicator lamp is turned on to indicate that the liquid level reaches the indicating height of the high liquid level probe, at the moment, the liquid metal is required to be stopped being injected into the cylinder, when the liquid metal is discharged, the high liquid level probe branch and the low liquid level probe branch are sequentially disconnected, the high liquid level indicator lamp and the low liquid level indicator lamp are sequentially turned off, it can be seen that the liquid metal can only be used for the lowest liquid level point and the highest liquid level point of the liquid metal, the liquid level between the two liquid level points can not be measured and detected, if more liquid level points are required to be measured, probes with different lengths need to be added, the probes are arranged on a measuring device to form a matrix structure formed by a plurality of probes, the occupied space is, according to the existing sealing technology, the more the number is, the more difficult the sealing is to be completed. The liquid level measuring device of the invention has a measuring principle completely different from the liquid metal liquid level measuring principle in the prior art, the invention adopts a heat conducting oil tank as a storage mechanism of heat conducting oil, a heat conducting oil pipeline is led out from the heat conducting oil tank and passes through the measured liquid metal tank, the heat conducting oil pipeline passes through an oil pump and a valve and then returns to the heat conducting oil tank to form a heat conducting oil circulating loop, a plurality of thermocouples are arranged in the heat conducting oil pipeline, leads of the thermocouples are led out from the heat conducting oil pipeline, when in use, the flow rate of the heat conducting oil in the heat conducting oil pipeline can be adjusted through the power control of the oil pump and the opening and closing degree control of the valve, more heat conducting oil is stored in the heat conducting oil tank, the heat radiating area is larger, the obvious temperature difference between the temperature of the heat conducting oil flowing into a measuring pipe and the temperature of the liquid metal, the output signal, the lamp of outside switches on, confirms current liquid metal liquid level through the bright of lamp and goes out, so, can survey out different metal liquid levels in effectual space range, improved liquid metal level measurement's accuracy greatly, moreover, because the part that needs sealed only has the tie point between heat conduction oil pipe way and the liquid metal tank, its single sealed requirement greatly reduced sealing performance's the degree of difficulty, can apply to liquid metal's level measurement more extensively.
And the heat conduction oil pipeline and the liquid metal tank are fixed and sealed by adopting an argon arc welding mode. Furthermore, in order to better realize the sealing between the heat-conducting oil pipeline and the liquid metal tank, the applicant summarizes a better realization mode through a plurality of experiments, and the argon arc welding mode has good effect on fixing and sealing.
The thermocouples are arranged in the heat-conducting oil pipeline at equal intervals. Through equidistant arrangement mode, can convert into actual liquid level height data through the bright circumstances of going out of lamp, have better commonality.
The method for measuring the multi-liquid level of the high-temperature liquid metal comprises the following steps:
(a) Placing the heat-conducting oil pipeline in a liquid metal tank, injecting liquid metal into the liquid metal tank from an inlet of the liquid metal tank, and discharging the liquid metal from an outlet of the liquid metal tank;
(b) the flowing speed of the heat conduction oil is controlled by controlling the power of the oil pump and the opening of the valve, so that the temperature difference between the oil temperature in the heat conduction oil tank and the temperature at a measuring point is more than 50 ℃;
(c) The thermocouples transmit the measured temperature through transmission lines, and when the temperature difference between two adjacent thermocouples reaches a set value, the level of the liquid metal is located between the two adjacent thermocouples.
Another object of the present invention is to provide a method for measuring the liquid level of high-temperature liquid metal suitable for the above apparatus, which controls the flow rate of the heat transfer oil by controlling the power of the oil pump and the opening degree of the valve, thereby controlling the temperature difference between the inside and the outside of the heat transfer oil pipe at the measuring point and accurately displaying the liquid level.
compared with the prior art, the invention has the following advantages and beneficial effects:
1. The invention relates to a high-temperature liquid metal multi-liquid level measuring device and a measuring method, which adopts a heat conduction oil tank as a storage mechanism of heat conduction oil, utilizes a heat conduction oil pipeline to be led out from the heat conduction oil tank and pass through a measured liquid metal tank, the heat conduction oil pipeline passes through an oil pump and a valve and then returns to the heat conduction oil tank to form a heat conduction oil circulation loop, a plurality of thermocouples are arranged in the heat conduction oil pipeline, leads of the thermocouples are led out from the heat conduction oil pipeline, when in use, the flow rate of the heat conduction oil in the heat conduction oil pipeline can be adjusted through the power control of the oil pump and the opening and closing degree control of the valve, more heat conduction oil is stored in the heat conduction oil tank, the heat dissipation area is larger, the obvious temperature difference between the temperature of the heat conduction oil flowing into a measuring pipe and the temperature of the liquid metal, the current liquid metal level is determined by turning on and off the lamp, so that different metal levels can be detected in an effective space range, the accuracy of liquid metal level measurement is greatly improved, and the difficulty of sealing performance is greatly reduced due to the single sealing requirement of the part needing to be sealed, which is only a connection point between the heat conduction oil pipeline and the liquid metal tank, and the liquid metal level can be more widely applied to the liquid metal level measurement;
2. The high-temperature liquid metal multi-liquid-level measuring device and the measuring method control the flowing speed of the heat conducting oil by controlling the power of the oil pump and the opening degree of the valve, thereby controlling the temperature difference inside and outside the heat conducting oil pipeline at the measuring point and accurately displaying the liquid level.
Drawings
the accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the measurement site of FIG. 1 according to the present invention.
Reference numbers and corresponding part names in the drawings:
1-thermocouple group lead wire bundle, 2-heat conducting oil tank, 3-heat conducting oil pipeline, 4-measuring pipe, 5-valve, 6-thermocouple, 7-liquid metal tank, 8-liquid metal tank outlet, 9-oil pump, 10-liquid metal tank inlet, and 61, 62, 63, 64 and 65 are all temperature measuring points of each thermocouple.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not to be construed as limiting the present invention.
Examples
as shown in fig. 1 to 2, the high-temperature liquid metal multi-liquid level measuring device and the measuring method of the invention comprise a liquid metal tank 7 and a heat-conducting oil tank 2, wherein a heat-conducting oil pipeline 3 is led out from the heat-conducting oil tank 2, the heat-conducting oil pipeline 3 sequentially passes through an oil pump 9 and a valve 5 and then returns to the heat-conducting oil tank 2 to form a heat-conducting oil circulation loop, wherein the heat-conducting oil pipeline 3 passes through the liquid metal tank 7, a plurality of thermocouples 6 are arranged in the heat-conducting oil pipeline 3, leading-out wires of the thermocouples 6 are led out from the heat-conducting oil tank 2, a working medium of the heat-conducting oil tank 2 is high-boiling-point heat-conducting oil, the heat-conducting oil pipeline 3 penetrates through the bottom of the liquid metal tank 7 and penetrates out from the top of the; the upper end of the heat conduction oil pipeline 3 is connected with the outlet of the heat conduction oil tank 2, and the lower end of the heat conduction oil pipeline 3 is connected with the inlet of the heat conduction oil tank 2 through the heat conduction oil pipeline 3 arranged outside the liquid metal tank 7; an oil pump 9 and a valve 5 are arranged on the heat conduction oil pipeline 3 and are used for driving and controlling the flow of the heat conduction oil; the thermocouples 6 are used for reading temperature signals so as to display liquid level, temperature measuring points 61, 62, 63, 64 and 65 of the thermocouples 6 are fixed on the inner wall surface of the heat conducting oil pipeline 3 at equal intervals, radial positions are positions of the liquid level to be measured, and the number of the temperature measuring points 6 of the thermocouple group is determined according to the number of the liquid level to be measured; after being numbered, the thermocouple group lead wire bundle 1 penetrates through the heat-conducting oil tank 2 from the inside to the outside through the heat-conducting oil pipeline 3 and penetrates out from the top of the heat-conducting oil tank 2, and the penetrating position is sealed by high-temperature glue.
The control method of the device comprises the following steps: firstly, a valve 5 on a heat conduction oil pipeline 3 is opened and an oil pump 9 is started, so that heat conduction oil circularly flows in a heat conduction oil loop along the direction shown in figure 1, then a small amount of liquid metal is filled into a liquid metal tank 7, so that the liquid metal enters from an inlet 10 of the liquid metal tank and flows out from an outlet 8 of the liquid metal tank, and at the moment, the obvious difference between the reading of a thermocouple at the lower part (below the liquid level) and the reading of a thermocouple at the upper part (above the liquid level) can be observed. When the liquid metal level or temperature changes, the flow of the oil pump 9 and the opening degree of the valve 5 are properly adjusted, and the reading difference between the lower thermocouple and the upper thermocouple is kept obvious. At this time, it can be determined that the liquid level is located between the positions of two adjacent thermocouples with obvious difference in readings, for example, if 10 measuring points are arranged, the readings of the thermocouples from top to bottom 1 to 6 are about 120 ℃, and the readings of the thermocouples from 7 to 10 are about 370 ℃, it can be determined that the liquid level is located between the temperature measuring points of the thermocouples 6 and 7, and the distances between the temperature measuring points of the thermocouples are smaller, that is, the closer the arrangement of the temperature measuring points of the thermocouples is, the higher the reading accuracy is. The liquid metal testing device is used in a liquid metal testing loop, the work is reliable, the expected function can be achieved, the detection result is easy to observe, and the whole device is simple and convenient to operate. Therefore, the invention is very suitable for measuring multiple liquid levels in a high-temperature liquid metal device.
the above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. Many liquid level measurement device of high temperature liquid metal, its characterized in that: the device comprises a liquid metal tank (7) and a heat conduction oil tank (2), wherein a heat conduction oil pipeline (3) is led out from the heat conduction oil tank (2), the heat conduction oil pipeline (3) penetrates through the liquid metal tank (7) and then sequentially passes through an oil pump (9) and a valve (5) and then returns to the heat conduction oil tank (2) to form a heat conduction oil circulation loop, a plurality of thermocouples (6) are arranged in the heat conduction oil pipeline (3), a lead wire bundle (1) of the thermocouples (6) is led out from the heat conduction oil tank (2), a working medium of the heat conduction oil tank (2) is high-boiling-point heat conduction oil, the heat conduction oil pipeline (3) penetrates through the bottom of the liquid metal tank (7) and penetrates out from the top of the liquid metal tank (7), and the contact position of the heat conduction oil pipeline (3) and the liquid metal tank (7); the upper end of the heat conduction oil pipeline (3) is connected with the outlet of the heat conduction oil tank (2), and the lower end of the heat conduction oil pipeline (3) is connected with the inlet of the heat conduction oil tank (2) through the heat conduction oil pipeline (3) arranged outside the liquid metal tank (7); an oil pump (9) and a valve (5) are arranged on the heat conduction oil pipeline (3) and are used for driving and controlling the flow of the heat conduction oil; the thermocouples (6) are used for reading temperature signals so as to display liquid level, temperature measuring points of the thermocouples (6) are fixed on the inner wall surface of the heat conducting oil pipeline (3) at equal intervals, radial positions are positions of quasi-measuring liquid levels, and the number of the temperature measuring points (6) of the thermocouple group is determined according to the number of the quasi-measuring liquid levels; after the thermocouple group lead wires (1) are numbered, the thermocouple group lead wires penetrate through the heat-conducting oil tank (2) from the inside to the top of the heat-conducting oil tank (2) through the heat-conducting oil pipeline (3) and penetrate out of the top of the heat-conducting oil tank (2), and the penetrating position is sealed by high-temperature glue.
2. The method for measuring the multiple liquid levels of the high-temperature liquid metal by using the device for measuring the multiple liquid levels of the high-temperature liquid metal in claim 1 comprises the following steps:
(a) Placing the heat-conducting oil pipeline (3) in a liquid metal tank (7), opening a valve (5) on the heat-conducting oil pipeline (3) and opening an oil pump (9), and injecting liquid metal into the liquid metal tank (7) from an inlet (10) of the liquid metal tank and discharging the liquid metal from an outlet (8) of the liquid metal tank;
(b) The flowing speed of the heat conduction oil is controlled by controlling the power of the oil pump (9) and the opening degree of the valve (5), so that the temperature difference between the oil temperature in the heat conduction oil tank (2) and the temperature at a measuring point is more than 50 ℃;
(c) The thermocouples (6) transmit the measured temperature through transmission lines, the level of the liquid metal being located between two adjacent thermocouples (6) when the temperature difference between them reaches a set value.
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| CN201710599792.2A CN107270995B (en) | 2017-07-21 | 2017-07-21 | High-temperature liquid metal multi-liquid-level measuring device and measuring method |
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| CN201710599792.2A CN107270995B (en) | 2017-07-21 | 2017-07-21 | High-temperature liquid metal multi-liquid-level measuring device and measuring method |
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| CN107270995B true CN107270995B (en) | 2019-12-10 |
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| CN201242464Y (en) * | 2008-06-25 | 2009-05-20 | 瞿瑛 | Self-heating thermal sensitive element |
| CN102564534B (en) * | 2012-01-08 | 2014-01-01 | 秦皇岛华电测控设备有限公司 | Magnetic liquidometer for water level of steam drum |
| CN105004399B (en) * | 2015-04-20 | 2018-10-16 | 北京吉泰凯士仪表科技有限公司 | Specific heat liquid level gauge |
| CN205308298U (en) * | 2015-10-27 | 2016-06-15 | 北京吉泰凯士仪表科技有限公司 | Take device of level gauge |
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