CN110146403B - High-temperature high-pressure steam humidity measuring device - Google Patents
High-temperature high-pressure steam humidity measuring device Download PDFInfo
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- CN110146403B CN110146403B CN201910299521.4A CN201910299521A CN110146403B CN 110146403 B CN110146403 B CN 110146403B CN 201910299521 A CN201910299521 A CN 201910299521A CN 110146403 B CN110146403 B CN 110146403B
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- 239000007788 liquid Substances 0.000 claims abstract description 94
- 238000009825 accumulation Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 23
- 239000000498 cooling water Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 62
- 241000521257 Hydrops Species 0.000 description 12
- 206010030113 Oedema Diseases 0.000 description 12
- 238000012545 processing Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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Abstract
The invention relates to a high-temperature high-pressure steam humidity measuring device, which comprises a steam leading-in pipe and a condenser connected with the steam leading-in pipe, wherein the condenser is connected with a constant-temperature water bath and comprises a box body, a condensing coil pipe arranged in the box body, a gas-liquid separator and a liquid accumulation tank arranged at the bottom of the box body, the condensing coil pipe and the gas-liquid separator are connected with the steam leading-in pipe, and the condensing coil pipe is wound on the outer side of the gas-liquid separator; the liquid accumulation tank is connected with a liquid level meter, a liquid discharge pipe and a return pipe, the liquid discharge pipe extends out of the box body of the condenser and is connected with a liquid accumulation weighing assembly, one end of the return pipe extends into the bottom of the liquid accumulation tank, and the other end of the return pipe is connected with the bottom of the inner cavity of the gas-liquid separator; the top of the gas-liquid separator is connected with a gas delivery pipe, and the gas delivery pipe is connected with a constant-temperature water bath. The device can measure the relative humidity and the moisture content of steam/gas, and provides guarantee for high-quality steam in precision equipment and a production process thereof.
Description
Technical Field
The invention relates to a high-temperature high-pressure steam humidity measuring device which can be applied to the fields of production and scientific research of foods, chemical industry, pharmacy, electric power and the like which take steam as a working medium.
Background
In the fields of chemical industry, electric power, food, medicine, building materials and the like, high-temperature steam is an important working medium or environmental condition in the production, preparation and technical treatment processes. The relative humidity of high-temperature steam is a key index parameter, and accurate humidity control and monitoring have important economic value in industrial production.
At present, JJF 1076 and 2001 humidity sensor calibration standard are mainly adopted in China, and a standard humidity environment is generated through a standard humidity generator. Humidity range of humidity generator: (5-95)% RH; temperature range: 5-50 ℃; pressure: and (4) normal pressure. In this standard humidity environment, the maximum partial vapor pressure is at 95% RH. When the temperature is 50 ℃, a saturated steam pressure gauge is checked to show that the saturated steam pressure is 12.378kPa at 50 ℃, for example, the relative humidity is 95% RH, and the steam partial pressure is 11.759 kPa. This means that the maximum steam partial pressure rating of the wetness sensing member is 11.759kPa, which is not necessarily true for higher steam partial pressures. Some foreign products are also calibrated by humidity generators with higher temperature standards, but the highest standard is limited to normal pressure environment, and the steam partial pressure reaches up to 101.325kPa even under 100% RH humidity, so theoretically, the range of the steam partial pressure measured by the humidity sensor should be within 101.325 kPa. Meanwhile, when the steam is close to a saturated state, dew condensation exists, and the moisture sensor is prone to water contact failure. So theoretically, the humidity sensor measures relative humidity in a range of less than 100% RH.
The patent published under the patent No. CN103712882 is a measuring method for obtaining the humidity and related parameters of the original gas by converting and calculating the temperature and pressure through throttle expansion, utilizing a pressure sensor and a temperature and humidity sensor to measure the gas parameters of heating and heat preservation (the gas pressure is higher than the normal pressure by 0.1-0.4atm, and the temperature is at 110-180 ℃) before the steam state changes and after the temperature, humidity and pressure are reduced and reduced. The parameters of the air flow after temperature reduction, humidity reduction and pressure reduction are still gases with higher temperature and pressure, so that the air flow still does not meet the use requirements of a chilled mirror dew point instrument adopted by the highest humidity standard of the World Meteorological Organization (WMO). The actual achieved accuracy is lower. The high-temperature high-humidity high-pressure gas is throttled and expanded, then the gas flow is condensed to 0-5 ℃ by adopting a condensation heat exchange mode, then the condensate is accurately weighed by a high-precision electronic balance, the relative humidity of the gas flow at 0-normal temperature and normal pressure is measured by a chilled mirror dew point instrument adopted by the highest standard of the humidity of the World Meteorological Organization (WMO), and the moisture content of the gas is calculated by measuring the temperature, pressure and flow of the gas flow. The total mass of the condensate and the moisture content of the cooled gas flow is the moisture content of the original high-temperature high-humidity high-pressure gas. And calculating the relative humidity of the original high-temperature high-pressure high-humidity gas by combining the parameters of the temperature, the pressure and the flow of the high-temperature high-pressure high-humidity gas before throttling expansion, the quality of condensate after throttling expansion, the temperature, the pressure, the flow, the relative humidity and the like through a gas state equation. The invention has higher precision and practical use value. The method and principle adopted by the invention in the measurement of relative humidity are different from those disclosed in the patent publication No. CN 103712882.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-temperature high-pressure steam humidity measuring device.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-temperature high-pressure steam humidity measuring device comprises a steam inlet pipe and a condenser connected with the steam inlet pipe, wherein the condenser is connected with a constant-temperature water bath and comprises a box body, a condensing coil pipe arranged in the box body, a gas-liquid separator and a liquid accumulation tank arranged at the bottom of the box body, the condensing coil pipe and the gas-liquid separator are connected with the steam inlet pipe, and the condensing coil pipe is wound on the outer side of the gas-liquid separator;
the liquid accumulation tank is connected with a liquid level meter, a liquid discharge pipe and a return pipe, the inside of the liquid accumulation tank is provided with an airflow baffle, one end of the liquid discharge pipe extends into the bottom of the liquid accumulation tank, the other end of the liquid discharge pipe extends out of the box body of the condenser and is connected with a liquid accumulation weighing assembly, one end of the return pipe extends into the bottom of the liquid accumulation tank, and the other end of the return pipe is connected with the bottom of the inner cavity of the gas-liquid separator;
and the top of the gas-liquid separator is connected with a gas delivery pipe, and the gas delivery pipe is connected with a constant-temperature water bath.
Further, the thermostatic water bath comprises a heat exchange coil connected with the gas delivery pipe, and a gas measurement assembly connected with the heat exchange coil, wherein the gas measurement assembly is connected with the exhaust pipe.
Furthermore, the gas measurement assembly is provided with a gas measurement cavity, the gas measurement cavity is connected with the heat exchange coil, and an airflow equalizer and an airflow equalizing baffle are arranged in the gas measurement cavity.
Further, the hydrops weighing component includes the hydrops bucket, and the bottom of hydrops bucket is equipped with electronic balance, the hydrops bucket with the fluid-discharge tube is connected.
Furthermore, the bottom of the box body is provided with a cooling water injection port, and the top of the box body is provided with a cooling water outlet. The cooling water spraying component of the cylindrical box body is S-shaped, the nozzle is a necking sharp nozzle, and the cooling water rotates at high speed in the cylindrical box body through the spraying component to enhance the heat exchange with the air flow in the condensation coil. The cooling water is physically isolated from the steam condensing coil, the liquid accumulation tank and the gas-liquid separator.
Furthermore, a temperature sensor, a pressure sensor, a steam electromagnetic valve and a steam flowmeter are arranged on the steam leading-in pipe, and the steam leading-in pipe and all parts have good heat preservation.
Further, the gas measurement cavity is connected with a temperature sensor, a humidity sensor and a gas flowmeter.
The invention has the beneficial effects that: the device can measure the relative humidity and the moisture content of steam/gas, provides guarantee for high-quality steam in precision equipment and a production process thereof, and can also accurately measure the relative humidity of the steam and provide basis for efficient utilization of the steam in energy industries such as electric power and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
Detailed Description
As shown in fig. 1, a high-temperature high-pressure steam humidity measuring device comprises a steam inlet pipe 1, a condenser 2 connected with the steam inlet pipe 1, the condenser 2 is connected with a thermostatic water bath 3, the condenser 2 comprises a box body 4, a condensing coil 5 arranged in the box body 4, a gas-liquid separator 6 and a liquid accumulation tank 7 arranged at the bottom of the box body 4, the condensing coil 5 and the gas-liquid separator 6 are connected with the steam inlet pipe 1, and the condensing coil 5 is wound outside the gas-liquid separator 6;
the liquid accumulation tank 7 is connected with a liquid level meter 8, a liquid discharge pipe 9 and a return pipe 10, an air flow baffle plate is arranged in the liquid accumulation tank 7, one end of the liquid discharge pipe 9 extends into the bottom of the liquid accumulation tank 7, the other end of the liquid discharge pipe extends out of the box body 4 of the condenser 2 and is connected with a liquid accumulation weighing component, one end of the return pipe 10 extends into the bottom of the liquid accumulation tank 7, and the other end of the return pipe is connected with the bottom of the inner cavity of the gas-liquid separator 6; the hydrops weighing component includes hydrops bucket 11, and the bottom of hydrops bucket 11 is equipped with electronic balance 12, and hydrops bucket 11 is connected with fluid-discharge tube 9. The bottom of box 4 is equipped with cooling water inlet 13, and the top of box 4 is equipped with cooling water outlet 27, and cooling water inlet 13 connects the cooling water injection part, and the cooling water injection part of cylinder type box 4 is "S" type, and the nozzle is the sharp mouth of throat, and the cooling water is through the high-speed rotatory air current heat exchange with in the condensing coil 5 of strengthening of injection part in cylindrical box 4. The cooling water is physically isolated from the steam condensing coil 5, the liquid accumulation tank 7 and the gas-liquid separator 6.
The top of the gas-liquid separator 6 is connected with a gas delivery pipe 25, and the gas delivery pipe 25 is connected with the thermostatic water bath 3. The thermostatic water bath 3 comprises a heat exchange coil 14 connected with a gas delivery pipe 25, and a gas measuring assembly connected with the heat exchange coil 14, wherein the gas measuring assembly is connected with an exhaust pipe 15.
Further, the gas measurement assembly is provided with a gas measurement cavity 16, the gas measurement cavity 16 is connected with the heat exchange coil 14, and a gas flow equalizer 17 and a gas flow equalizing baffle 18 are arranged in the gas measurement cavity 16.
Further, the steam introduction pipe 1 is provided with a temperature sensor 19, a pressure sensor 20, a steam solenoid valve 21, and a steam flow meter 22. The gas measurement cavity 16 is connected with a temperature sensor 23, a humidity sensor 24 and a gas flowmeter 28.
When the steam is introduced into the steam introducing pipe 1, the temperature sensor 19 and the pressure sensor 20 can accurately monitor the temperature and pressure parameters of the measured steam. The steam flow meter 22 controls and monitors the flow, quality of the steam passing through. Steam introduced by the steam introducing pipe 1 enters the condensing coil 5, the steam is cooled and condensed in the condensing coil 5 of the condenser 2, the separated liquid is collected in the liquid accumulation tank 7, and low-temperature gas further passes through the gas-liquid separator 6 and then is discharged out of the condenser 2 to enter the gas leading-out pipe 25.
Further, connect level gauge 8, fluid-discharge tube 9 and back flow 10 on the hydrops jar 7, the air current baffle in the hydrops jar 7, fluid-discharge tube 9 stretches out 4 outer joint hydrops weighing component of box of condenser 2, and the bottom of hydrops jar 7 is stretched into to the one end of back flow 10, the other end with the bottom of 6 inner chambers of vapour and liquid separator is connected. The air flow baffle plate effectively reduces the dynamic pressure of low-temperature air flow to liquid in the liquid accumulation tank 7. The gas-liquid separator 6 consists of a cavity and a welded multilayer metal filter. The flow speed of the low-temperature gas flow is rapidly reduced after the low-temperature gas flow enters the gas-liquid separator 6, and liquid drops carried by the gas flow are collected and flow back to the liquid accumulation tank 7 under the dual actions of gravity and filter filtration. The return pipe 10 extends into the bottom of the liquid accumulation tank 7 to prevent the air flow from entering the liquid accumulation barrel 11 through the liquid accumulation tank 7 to be discharged.
The drain pipe 9 extends into the bottom of the liquid accumulation tank 7, and the condensate forms a liquid seal in the liquid accumulation tank 7 to realize the purpose of separating low-temperature airflow from the condensate. The low-temperature gas flow is discharged through the gas-liquid separator 6, and the condensate in the liquid accumulation tank 7 is collected into the liquid accumulation barrel 11 through the liquid discharge pipe 9. The condensed and separated liquid water is weighed by the electronic balance 12 in real time, then the temperature and weight parameters are transmitted to the processing system 26, and a singlechip with the model number of 89C2051 is arranged in the processing system 26.
The steam of gas in the gas eduction tube 25 that is discharged through the condenser 2 enters the heat exchange coil 14 in the thermostatic water bath 3, and the gas enters the gas measurement cavity 16 after the accurate temperature control of the heat exchange coil 14. The gas passes through the gas flow equalizer 17 and the gas flow equalizing baffle 18 in the gas measuring cavity 16 in sequence to achieve the purposes of speed reduction and uniform speed, and is further discharged through the gas flow meter 28 and the exhaust pipe 15.
In the invention, the steam exchanges heat through the condensing coil 5 and is condensed into low-temperature liquid water. Gas in the steam enters the gas-liquid separator 6 after heat exchange and temperature reduction in the condensing coil 5, the gas-liquid separator 6 removes liquid drops carried by airflow, the gas enters the heat exchange coil 14 in the constant-temperature water bath 3, and the gas enters the gas measurement cavity 16 after the temperature is accurately controlled by the heat exchange coil 14. The temperature sensor 23, humidity sensor 24, and flow meter 28 in the gas measurement chamber 16 accurately monitor the gas flow parameters and communicate them to the processing system 26 in real time. The processing system 26 calculates the temperature and weight parameters of the liquid water transmitted by the electronic balance 12, the temperature, humidity and flow parameters of the gas in the thermostatic water bath 3 comprehensively, and then compares the parameters with the steam temperature and pressure on the steam inlet pipe 1 and the parameters of the flow meter 22 to calculate the moisture content and relative humidity of the steam.
The invention is illustrated below with reference to specific examples:
case 1
Steam temperature T of a certain steam pipeline entering measuring device1Pressure P1Mass flow rate m1(g/min), condensing the steam by the condenser 2, continuously collecting the condensate into the liquid storage barrel 11, and measuring the mass flow of the condensate by the electronic balance 12 to be m2(g/min). Cooling air flow enters the water bath measuring cavity heat exchange coil after passing through the gas-liquid separator 6, and the temperature T of the air flow is accurately controlled2Pressure P2Relative humidity X1% volume flow V1(L/min). The single chip of the processing system 26 receives signals of monitoring sensors/devices such as a temperature sensor, a pressure sensor, a flowmeter, an electronic balance and the like in real time and calculates related parameters such as the relative humidity of steam.
According to the steam temperature T1Pressure P1The saturated vapor pressure P or mass flow m (g/min) of the water vapor under the condition is calculated. According to steam mass flow m1(g/min), measuring the condensed water m by an electronic balance2(g/min), water bath measurement Chamber airflow temperature T2Pressure P2Relative humidity X1Percent, calculating the water content m of the cooling air flow3(mass flow g/min). The air flow temperature T of the cavity can also be measured through a water bath2Pressure P2Relative humidity X1% volume flow V1(L/min), calculating the water content m of the cooling air flow3(mass flow rate)g/min). According to the steam temperature T1Pressure P1Measuring the condensed water m by an electronic balance2(g/min), moisture content m of the cooling air stream3(mass flow g/min) and calculating the partial pressure P of the steam3. Relative humidity of steam RH ═ P3P). times.100%. The calculation is referred to the IAPWS-IF97 formula.
The device can measure the relative humidity and the moisture content of steam/gas, provides guarantee for high-quality steam in precision equipment and a production process thereof, and can also accurately measure the relative humidity of the steam and provide basis for efficient utilization of the steam in energy industries such as electric power and the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equally replaced; however, these modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention.
Claims (6)
1. A high-temperature high-pressure steam humidity measuring device comprises a steam leading-in pipe, a condenser connected with the steam leading-in pipe, and a thermostatic water bath connected with the condenser, and is characterized in that the condenser comprises a box body, a condensing coil arranged in the box body, a gas-liquid separator and a liquid accumulation tank arranged at the bottom of the box body, wherein the condensing coil and the gas-liquid separator are connected with the steam leading-in pipe, and the condensing coil is wound on the outer side of the gas-liquid separator;
the liquid accumulation tank is connected with a liquid level meter, a liquid discharge pipe and a return pipe, the inside of the liquid accumulation tank is provided with an airflow baffle, one end of the liquid discharge pipe extends into the bottom of the liquid accumulation tank, the other end of the liquid discharge pipe extends out of the box body of the condenser and is connected with a liquid accumulation weighing assembly, one end of the return pipe extends into the bottom of the liquid accumulation tank, and the other end of the return pipe is connected with the bottom of the inner cavity of the gas-liquid separator;
the top of the gas-liquid separator is connected with a gas delivery pipe, and the gas delivery pipe is connected with a constant-temperature water bath;
the constant-temperature water bath comprises a heat exchange coil connected with a gas delivery pipe, and a gas measurement assembly connected with the heat exchange coil, wherein the gas measurement assembly is connected with an exhaust pipe.
2. The apparatus of claim 1, wherein the gas measurement assembly comprises a gas measurement chamber, the gas measurement chamber is connected to the heat exchange coil, and a gas flow equalizer baffle are disposed in the gas measurement chamber.
3. The high-temperature high-pressure steam humidity measuring device as claimed in claim 1, wherein the liquid accumulation weighing assembly comprises a liquid accumulation barrel, an electronic balance is arranged at the bottom of the liquid accumulation barrel, and the liquid accumulation barrel is connected with the liquid discharge pipe.
4. A high temperature high pressure steam humidity measuring device as claimed in claim 1, wherein the bottom of the box is provided with a cooling water inlet.
5. A high temperature and high pressure steam humidity measuring device as claimed in claim 1, wherein the steam inlet pipe is provided with a temperature sensor, a pressure sensor, a steam solenoid valve and a steam flow meter.
6. The high-temperature high-pressure steam humidity measuring device as claimed in claim 2, wherein the gas measuring cavity is connected with a temperature sensor, a humidity sensor and a gas flowmeter.
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| CN201910299521.4A CN110146403B (en) | 2019-04-15 | 2019-04-15 | High-temperature high-pressure steam humidity measuring device |
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| CN110146403B true CN110146403B (en) | 2021-10-22 |
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| CN111060039A (en) * | 2019-12-27 | 2020-04-24 | 宁波奥克斯电气股份有限公司 | Detection device and detection method for pressure equalizing hole of gas-liquid separator |
| CN117213895B (en) * | 2023-11-09 | 2024-01-30 | 山东正诺化工设备有限公司 | Detection device for coiled tube type heat exchanger under low-temperature working condition |
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