CN112362130A - Liquid level alarming method for high-temperature pressure container - Google Patents
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- 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 relates to the field of sensing monitoring, in particular to a liquid level alarming method of a high-temperature pressure container, which comprises the following steps: 1) the liquid level alarm device is provided with a liquid level measuring sensor, a plurality of thermal resistors are arranged in a shell of a measuring electrode of the liquid level measuring sensor, each thermal resistor is a liquid level measuring point, the thermal resistors are connected in series and connected into a constant current power supply through a lead, and the voltage of the thermal resistor at the top is VTop roofThe voltage of the bottom thermal resistor is VBottomThe total voltage of each thermal resistor of the measuring electrode is VGeneral assembly(ii) a 2) Collecting reference voltages of the top thermal resistor and the bottom thermal resistor in different states: 3) the liquid level measuring sensor of the liquid level alarm device is vertically arranged in the container, the liquid level in the container is monitored through the measuring electrode, and the liquid level alarm device monitors the total voltage V of each thermal resistor of the measuring electrodeGeneral assemblyTop thermal resistance voltage VTop roofVoltage V of bottom thermal resistanceBottomAnd judging the number of thermal resistors exposed out of the liquid level, determining the height of the liquid level, and giving an alarm according to the requirement.
Description
Technical Field
The invention relates to the field of sensing monitoring, in particular to a liquid level alarming method of a high-temperature pressure container.
Background
In modern industrial production, the sensor for liquid level alarm is often used for liquid level monitoring of high temperature, high pressure, strong irradiation and vibration environment, especially the nuclear field environment has higher performance requirement on the liquid level sensor, the common liquid level sensor is difficult to meet the requirement, the sensor for liquid level alarm at present is set up for alarming the liquid level by using the principle of the multipurpose thermocouple, but because a plurality of alarm monitoring points with different levels are arranged for the requirement of one pressure container, a plurality of thermocouples are required to be set up for detecting the alarm monitoring points with different levels, the liquid level alarm system in one pressure container is complicated, and the reliability is greatly reduced.
The import price of the nuclear power liquid level alarm sensor produced abroad is high, and is limited by international factors, when the import liquid level sensor is maintained and repaired, the technical response time of foreign manufacturers is long, the production operation of enterprises is seriously influenced, and spare parts are difficult to replace.
Disclosure of Invention
The invention aims to provide a liquid level alarm method of a high-temperature pressure container, which aims at overcoming the corresponding defects in the prior art, monitors and alarms the position of a liquid level in high-temperature, high-pressure, strong-irradiation, vibration/vibration environments, and has the advantages of accurate measurement, high reliability and low energy consumption.
The purpose of the invention is realized by adopting the following scheme: a liquid level alarming method of a high-temperature pressure container comprises the following steps:
1) the liquid level alarm device is provided with a liquid level measuring sensor, a plurality of thermal resistors with the same resistance value in a non-electrified state are arranged in a shell of a measuring electrode of the liquid level measuring sensor, each thermal resistor is a liquid level measuring point, the thermal resistors are connected in series and connected with a constant current power supply through leads, and the liquid level alarm device is provided with a liquid level measuring sensorThe voltage of the top thermal resistor is VTop roofThe voltage of the bottom thermal resistor is VBottomThe total voltage of each thermal resistor of the measuring electrode is VGeneral assembly；
2) Collecting reference voltages of the top thermal resistor and the bottom thermal resistor in different states:
2-1) when the thermal resistance of each liquid level measuring point of the measuring electrode is all located above the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VSmall；
2-2) when the thermal resistance of each liquid level measuring point of the measuring electrode is all positioned below the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VBig (a)；
3) The liquid level measuring sensor of the liquid level alarm device is vertically arranged in the container, the liquid level in the container is monitored through the measuring electrode, and the liquid level alarm device monitors the total voltage V of each thermal resistor of the measuring electrodeGeneral assemblyTop thermal resistance voltage VTop roofVoltage V of bottom thermal resistanceBottomThe number of thermal resistors exposed out of the liquid level is judged according to the following principle, the height of the liquid level is determined, and an alarm is given according to the requirement:
3-1) when VTop roof＝VBottom＝VSmallWhen the temperature is higher than the preset temperature, the thermal resistor is completely positioned below the liquid level;
3-2) when VTop roof＝VBottom＝VBig (a)When the temperature is higher than the liquid level, the thermal resistance is completely above the liquid level;
3-3) when VTop roof≠VBottomThe calculation formula of the number m of the thermal resistors exposed to the liquid surface is as follows:
in the formula, n is the number of thermal resistors of the measuring electrode, m is the number of thermal resistors above the liquid level, and VTop roofIs the top thermal resistance voltage, VBottomIs the bottom thermal resistance voltage, VGeneral assemblyTo measure the total voltage across the individual thermal resistors.
The invention has the following beneficial effects: liquid level alarm device inserts the constant current for liquid level measurement sensor, because the resistance value of thermal resistance can change because thermal resistance sends down thermogenic temperature variation under the on state, when liquid level measurement point of liquid level measurement sensor is in the air, because air coefficient of heat conductivity is less, the heat that the thermal resistance produced is difficult to be absorbed by the air fast, consequently, the temperature of thermal resistance risees, the resistance value grow of thermal resistance, under the effect of constant current, the total voltage V of each thermal resistance of the utmost point of measurement of liquid level measurement sensorGeneral assemblyAnd (4) rising.
When the liquid level measurement point of the liquid level measurement sensor is in liquid, because the heat conductivity of the liquid is far stronger than that of the air, the heat generated by the thermal resistor can be quickly absorbed by the liquid, the temperature of the thermal resistor is reduced, the resistance value of the thermal resistor is reduced, and under the action of constant current, the total voltage V of each thermal resistor of the measurement pole of the liquid level measurement sensorGeneral assemblyAnd decreases.
Therefore, when the liquid level measuring points of the liquid level measuring sensor are all in the air, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyAt maximum, when the liquid level measuring points of the liquid level measuring sensor are all in the liquid, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyThe minimum, namely:
when V isTop roof＝VBottom＝VSmallWhen the temperature is higher than the preset temperature, the thermal resistor is completely positioned below the liquid level;
when V isTop roof＝VBottom＝VBig (a)When the temperature is higher than the liquid level, the thermal resistance is completely above the liquid level;
according to the circuit principle, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyEqual to the sum of the voltages across the thermal resistors of the level measuring point in air plus the sum of the voltages across the thermal resistors of the level measuring point in liquid, then there are:
when V isTop roof≠VBottomThe calculation formula of the number m of the thermal resistors exposed to the liquid surface is as follows:
in the formula, n is the number of thermal resistors of the measuring electrode, m is the number of thermal resistors above the liquid level, and VTop roofIs the top thermal resistance voltage, VBottomIs the bottom thermal resistance voltage, VGeneral assemblyTo measure the total voltage across the individual thermal resistors.
The invention has the advantages that the invention is suitable for monitoring and alarming the liquid level position in high-temperature, high-pressure, strong irradiation, vibration/vibration environment, and only needs to monitor the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyTop thermal resistance voltage VTop roofVoltage V of bottom thermal resistanceBottomThe number m of the thermal resistors exposed out of the liquid surface can be accurately obtained, any number of liquid level measuring points can be added on the measuring electrode without adding more lead-out wires, the reliability is high, and the energy consumption is low.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a liquid level measuring sensor employed in the present invention;
FIG. 3 is a partial structural view of portion A of FIG. 2;
FIG. 4 is a partial structural view of the portion B in FIG. 2;
FIG. 5 is a partial structural view of a portion C in FIG. 2;
Detailed Description
As shown in fig. 1 to 5, a method for alarming a liquid level of a high-temperature pressure vessel includes the following steps:
1) the liquid level alarm device is provided with a liquid level measuring sensor, a plurality of thermal resistors with the same resistance value in a non-electrified state are arranged in a shell of a measuring electrode of the liquid level measuring sensor, each thermal resistor is a liquid level measuring point, the thermal resistors are connected in series and connected with a constant current power supply through a lead, and the voltage of the thermal resistor at the top is VTop roofThe voltage of the bottom thermal resistor is VBottomThe total voltage of each thermal resistor of the measuring electrode is VGeneral assembly；
2) Collecting reference voltages of the top thermal resistor and the bottom thermal resistor in different states:
2-1) when the thermal resistance of each liquid level measuring point of the measuring electrode is all located above the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VSmall；
2-2) when the thermal resistance of each liquid level measuring point of the measuring electrode is all positioned below the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VBig (a)；
3) The liquid level measuring sensor of the liquid level alarm device is vertically arranged in the container, the liquid level in the container is monitored through the measuring electrode, and the liquid level alarm device monitors the total voltage V of each thermal resistor of the measuring electrodeGeneral assemblyTop thermal resistance voltage VTop roofVoltage V of bottom thermal resistanceBottomThe number of thermal resistors exposed out of the liquid level is judged according to the following principle, the height of the liquid level is determined, and an alarm is given according to the requirement:
3-1) when VTop roof＝VBottom＝VSmallWhen the temperature is higher than the preset temperature, the thermal resistor is completely positioned below the liquid level;
3-2) when VTop roof＝VBottom＝VBig (a)When the temperature is higher than the liquid level, the thermal resistance is completely above the liquid level;
3-3) when VTop roof≠VBottomThe calculation formula of the number m of the thermal resistors exposed to the liquid surface is as follows:
in the formula, n is the number of thermal resistors of the measuring electrode, m is the number of thermal resistors above the liquid level, and VTop roofIs the top thermal resistance voltage, VBottomIs the bottom thermal resistance voltage, VGeneral assemblyTo measure the total voltage across the individual thermal resistors.
The liquid level alarm device accesses constant current to the liquid level measuring sensor, and when the liquid level measuring point of the liquid level measuring sensor is positioned in the air, the resistance value of the thermal resistor changes due to the temperature change generated by the thermal resistor in the power-on stateIn the middle time, because the air heat conductivity coefficient is less, the heat that the thermal resistance produced is difficult to be absorbed by the air fast, consequently, the temperature of thermal resistance risees, and the resistance value grow of thermal resistance, under the effect of constant current, total voltage V of each thermal resistance of measurement utmost point of level measurement sensorGeneral assemblyAnd (4) rising.
When the liquid level measurement point of the liquid level measurement sensor is in liquid, because the heat conductivity of the liquid is far stronger than that of the air, the heat generated by the thermal resistor can be quickly absorbed by the liquid, the temperature of the thermal resistor is reduced, the resistance value of the thermal resistor is reduced, and under the action of constant current, the total voltage V of each thermal resistor of the measurement pole of the liquid level measurement sensorGeneral assemblyAnd decreases.
Therefore, when the liquid level measuring points of the liquid level measuring sensor are all in the air, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyAt maximum, when the liquid level measuring points of the liquid level measuring sensor are all in the liquid, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyThe minimum, namely:
when V isTop roof＝VBottom＝VSmallWhen the temperature is higher than the preset temperature, the thermal resistor is completely positioned below the liquid level;
when V isTop roof＝VBottom＝VBig (a)When the temperature is higher than the liquid level, the thermal resistance is completely above the liquid level;
according to the circuit principle, the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assemblyEqual to the sum of the voltages across the thermal resistors of the level measuring point in air plus the sum of the voltages across the thermal resistors of the level measuring point in liquid, then there are:
when V isTop roof≠VBottomThe calculation formula of the number m of the thermal resistors exposed to the liquid surface is as follows:
in the formula, n is the number of thermal resistors of the measuring electrode, m is the number of thermal resistors above the liquid level, and VTop roofIs the top thermal resistance voltage, VBottomIs a bottomPartial thermal resistance voltage, VGeneral assemblyTo measure the total voltage across the individual thermal resistors.
In the embodiment, the liquid level alarm sensor for the high-temperature pressure vessel comprises a tubular metal shell 1 with a sealed lower end, wherein the sealed upper end of the tubular metal shell 1 is provided with a sealed connector 2, and a first signal line 3, a second signal line 4, a third signal line 5 and a fourth signal line 6 are arranged in a cavity of the tubular metal shell 1; first signal line 3 is connected with third signal line 5 through a plurality of thermal resistance 7 of establishing ties, a plurality of thermal resistance 7 of establishing ties are arranged along the axial interval of tubulose metal casing 1, thermal resistance 7's axial length is 5 ~ 20mm to guarantee high temperature pressure vessel's liquid level warning precision. The thermal resistor 7 is a platinum thermal resistor, the resistance value of the platinum thermal resistor increases along with the increase of the temperature, the resistance change rate is smaller as the temperature is higher, and the error generated by measurement is smaller. The platinum thermal resistor is formed by spirally winding a platinum wire, has good thermal conductivity and leaves an abdicating space for the signal wire. Two adjacent hot resistance 7 are connected by wire 8, wire 8 is the silver wire, and the resistivity of silver silk is low, has good heat conductivity, only plays the effect of switching on to the signal of telecommunication of whole circuit, can not produce obvious influence to voltage and electric current, increase test error. The lower end of the thermal resistor positioned at the bottom among the plurality of thermal resistors 7 is connected with the first signal line 3, the upper end of the thermal resistor positioned at the bottom is connected with the second signal line 4, the upper end of the thermal resistor positioned at the top is connected with the third signal line 5, the lower end of the thermal resistor positioned at the top is connected with the fourth signal line 6, the inner cavity of the tubular metal shell 1 is filled with an insulating material 9, so that each signal line, the lead 8, the plurality of thermal resistors 7 and the tubular metal shell 1 are respectively isolated, the insulating material 9 is an inorganic insulating material, such as aluminum oxide powder, aluminum nitride powder, magnesium oxide powder and the like, and has the advantages of high thermal conductivity, high temperature resistance, high resistivity, small dielectric loss and good insulating property. In this example, aluminum nitride powder was used as the insulating material. The leading-out end of each signal wire extends outwards through the sealing connector 2. Each signal wire is a copper wire, or the part of each signal wire in the tubular metal shell 1 is a silver wire, and the leading-out end of each signal wire is a copper wire.
Because the first signal line 3, the second signal line 4, the third signal line 5 and the fourth signal line 6 are arranged in the cavity of the tubular metal shell 1, the following steps are carried out:
a constant current power supply is connected between the first signal wire 3 and the third signal wire 5, and the total voltage V of each thermal resistor of a measuring electrode of the liquid level measuring sensorGeneral assemblyCan be obtained by monitoring the voltage between the first signal line 3 and the third signal line 5;
bottom thermal resistance voltage V of liquid level measuring sensorBottomCan be obtained by monitoring the voltage between the first signal line 3 and the second signal line 4;
top thermal resistance voltage V of liquid level measuring sensorTop roofCan be obtained by monitoring the voltage between the third signal line 5 and the fourth signal line 6;
collecting reference voltages of the top thermal resistor and the bottom thermal resistor in different states:
when the thermal resistance of each liquid level measurement point of the measuring electrode is all located above the liquid level, the voltage of the top thermal resistance and the voltage of the bottom thermal resistance are respectively collected, and the measuring electrode can be obtained:
Vtop roof＝17.8V；VBottom＝18V；
I.e. VTop roof≈VBottomThe voltage of the top thermal resistor is basically the same as that of the bottom thermal resistor;
when the thermal resistance of each liquid level measuring point of the measuring electrode is all located below the liquid level, the voltage of the top thermal resistance and the voltage of the bottom thermal resistance are respectively collected, and the measuring electrode can be obtained:
Vtop roof＝24.3V；VBottom＝24.1V；
I.e. VTop roof≈VBottomThe voltage of the top thermal resistor is basically the same as that of the bottom thermal resistor;
it is understood that the top thermal resistance voltage or the bottom thermal resistance voltage when all the thermal resistances at the respective liquid level measurement points of the measurement electrode are located above the liquid level is smaller than the top thermal resistance voltage or the bottom thermal resistance voltage when all the thermal resistances are located below the liquid level.
The number of the thermal resistors with the same resistance value in the non-electrified state, which are arranged in the shell of the measuring electrode of the liquid level measuring sensor, is 6, the total resistance value in the normal-temperature non-electrified state is 90 omega, the thermal resistors are connected in series through a lead and connected with a constant current power supply 1A, and then the measuring electrode of the liquid level measuring sensor is completely inserted into a sealed glass container with the liquid temperature of 80 ℃.
At the moment, the computer monitors the total voltage V of each thermal resistor through the liquid level measuring sensorGeneral assembly108V, bottom thermal resistance voltage VBottom18V, top thermal resistance voltage VTop roof17.8V, i.e. VTop roof≈VBottom: the voltage of the bottom thermal resistor is basically the same as that of the top thermal resistor, and the situation that all the thermal resistors are below the liquid level can be judged;
discharging the liquid in the container, slowly lowering the liquid level until the voltage value monitored by the liquid level measuring sensor is stable after being changed, and obtaining the total voltage V of each thermal resistor of the measuring electrode of the liquid level measuring sensorGeneral assembly114.03V, bottom thermal resistance voltage VBottom18V, top thermal resistance voltage VTop roof24.3V, i.e.: vTop roof≠VBottomFrom the formula
Calculating the number m of thermal resistors exposed on the liquid surface:
the number of the thermal resistors exposed out of the liquid surface is 1, the top thermal resistor of the measuring electrode can be judged to be above the liquid surface, the rest thermal resistors are below the liquid surface, the liquid level can be known to drop to a position between the liquid level measuring point corresponding to the top thermal resistor and the liquid level measuring point corresponding to the thermal resistor adjacent to the top thermal resistor, and corresponding alarm can be given according to the requirement;
by analogy, as the liquid level continues to fall, the thermal resistance exposed to the liquid level increases, for example, the number of the thermal resistances exposed to the liquid level is 2, and the voltage value monitored by the liquid level measuring sensor is generatedThe voltage tends to be stable after being changed, and the total voltage V of each thermal resistor of the measuring electrode is obtainedGeneral assembly121.21V, bottom thermal resistance voltage VBottom18.1V, top thermal resistance voltage VTop roof24.4V, i.e.: vTop roof≠VBottomFrom the formula
Calculating the number m of thermal resistors exposed on the liquid surface:
namely, the number of the thermal resistors exposed out of the liquid surface is 2, and the rest thermal resistors are all positioned below the liquid surface, so that corresponding alarm can be given according to the requirement;
according to the measuring principle, various alarming reminders can be set according to the position of the liquid outlet surface, when in actual monitoring, the more thermal resistors exposed out of the liquid surface mean that the liquid level in the container is lower, otherwise, when the liquid level of the container rises, the total voltage V of the thermal resistors of the measuring electrode of the liquid level measuring sensorGeneral assemblyThe position of the liquid level can also be calculated as described above.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make modifications without departing from the spirit of the present invention.
Claims (1)
1. A liquid level alarming method of a high-temperature pressure container is characterized by comprising the following steps:
1) the liquid level alarm device is provided with a liquid level measuring sensor, a plurality of thermal resistors with the same resistance value in a non-electrified state are arranged in a shell of a measuring electrode of the liquid level measuring sensor, each thermal resistor is a liquid level measuring point, the thermal resistors are connected in series and connected with a constant current power supply through a lead, and the voltage of the thermal resistor at the top is VTop roofThe voltage of the bottom thermal resistor is VBottomThe total voltage of each thermal resistor of the measuring electrode is VGeneral assembly；
2) Collecting reference voltages of the top thermal resistor and the bottom thermal resistor in different states:
2-1) when the thermal resistance of each liquid level measuring point of the measuring electrode is all located above the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VSmall；
2-2) when the thermal resistance of each liquid level measuring point of the measuring electrode is all positioned below the liquid level, respectively collecting the voltage of the top thermal resistance and the voltage of the bottom thermal resistance, and obtaining: vTop roof＝VBottom＝VBig (a)；
3) The liquid level measuring sensor of the liquid level alarm device is vertically arranged in the container, the liquid level in the container is monitored through the measuring electrode, and the liquid level alarm device monitors the total voltage V of each thermal resistor of the measuring electrodeGeneral assemblyTop thermal resistance voltage VTop roofVoltage V of bottom thermal resistanceBottomThe number of thermal resistors exposed out of the liquid level is judged according to the following principle, the height of the liquid level is determined, and an alarm is given according to the requirement:
3-1) when VTop roof＝VBottom＝VSmallWhen the temperature is higher than the preset temperature, the thermal resistor is completely positioned below the liquid level;
3-2) when VTop roof＝VBottom＝VBig (a)When the temperature is higher than the liquid level, the thermal resistance is completely above the liquid level;
3-3) when VTop roof≠VBottomThe calculation formula of the number m of the thermal resistors exposed to the liquid surface is as follows:
in the formula, n is the number of thermal resistors of the measuring electrode, m is the number of thermal resistors above the liquid level, and VTop roofIs the top thermal resistance voltage, VBottomIs the bottom thermal resistance voltage, VGeneral assemblyTo measure the total voltage across the individual thermal resistors.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1020714A2 (en) * | 1999-01-18 | 2000-07-19 | CTS Corporation | Fluid level detector using thermoresistive sensor |
| CN1900664A (en) * | 2005-07-19 | 2007-01-24 | 南京大学 | Resistance type water level sensor |
| CN102455204A (en) * | 2010-10-19 | 2012-05-16 | 中国石油化工股份有限公司 | Liquid level measurement system and method for kettle-type container and kettle-type container |
| CN103983321A (en) * | 2014-04-29 | 2014-08-13 | 南通中远船务自动化有限公司 | Boiler water level detector |
| CN204924372U (en) * | 2015-08-21 | 2015-12-30 | 山东桑乐太阳能有限公司 | Level sensor based on temperature sensor |
-
2020
- 2020-09-15 CN CN202010969539.3A patent/CN112362130A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1020714A2 (en) * | 1999-01-18 | 2000-07-19 | CTS Corporation | Fluid level detector using thermoresistive sensor |
| CN1900664A (en) * | 2005-07-19 | 2007-01-24 | 南京大学 | Resistance type water level sensor |
| CN102455204A (en) * | 2010-10-19 | 2012-05-16 | 中国石油化工股份有限公司 | Liquid level measurement system and method for kettle-type container and kettle-type container |
| CN103983321A (en) * | 2014-04-29 | 2014-08-13 | 南通中远船务自动化有限公司 | Boiler water level detector |
| CN204924372U (en) * | 2015-08-21 | 2015-12-30 | 山东桑乐太阳能有限公司 | Level sensor based on temperature sensor |
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