Dew point testing device and dew point testing method
阅读说明：本技术 一种露点测试装置及露点测试方法 (Dew point testing device and dew point testing method ) 是由 崔士涛 邓存柏 瞿丽娟 陈允至 黄志华 于 2020-08-24 设计创作，主要内容包括：本发明涉及露点测试技术领域,公开了一种露点测试装置及露点测试方法。露点测试装置包括控制器、管路、流量检测器、增湿器、第一压力检测器、第一温度检测器、冷却机构、第二压力检测器、第二温度检测器、收集器和计时器。流量检测器、增湿器和冷却机构依次设置在管路上。第一压力检测器和第一温度检测器设置在增湿器和冷却机构之间。第二压力检测器和第二温度检测器设置在冷却机构的出口侧。收集器用于收集增湿气体处理后凝结的液态水并检测液态水的质量。计时器用于记录增湿气体处理后凝结液态水的时间。本发明提供的露点测试装置,可以在不使用露点仪的情况下测试出增湿气体的露点值,降低测试成本,提高测试精度。(The invention relates to the technical field of dew point testing, and discloses a dew point testing device and a dew point testing method. The dew point testing device comprises a controller, a pipeline, a flow detector, a humidifier, a first pressure detector, a first temperature detector, a cooling mechanism, a second pressure detector, a second temperature detector, a collector and a timer. The flow detector, the humidifier and the cooling mechanism are sequentially arranged on the pipeline. The first pressure detector and the first temperature detector are disposed between the humidifier and the cooling mechanism. The second pressure detector and the second temperature detector are disposed on an outlet side of the cooling mechanism. The collector is used for collecting the condensed liquid water after the humidifying gas treatment and detecting the quality of the liquid water. The timer is used for recording the time of condensing liquid water after the humidifying gas treatment. The dew point testing device provided by the invention can test the dew point value of the humidified gas under the condition of not using a dew point instrument, thereby reducing the testing cost and improving the testing precision.)
1. A dew point testing device, comprising:
a controller (1);
a pipeline (2) for introducing gas;
the flow detector (3), the humidifier (4) and the cooling mechanism (7) are sequentially arranged on the pipeline (2);
a first pressure detector (5) and a first temperature detector (6), both disposed between the humidifier (4) and the cooling mechanism (7);
a second pressure detector (8) and a second temperature detector (9), both disposed at an outlet side of the cooling mechanism (7);
the collector (10) is arranged at the outlet side of the cooling mechanism (7) and is used for collecting the condensed liquid water after the humidifying gas treatment and detecting the quality of the liquid water;
a timer (11) for recording the time of condensing the liquid water after the humidification gas treatment;
the flow rate detector (3), the humidifier (4), the first pressure detector (5), the first temperature detector (6), the cooling mechanism (7), the second pressure detector (8), and the second temperature detector (9) are all electrically connected to the controller (1).
2. Dew point test unit as claimed in claim 1, characterized in that the cooling mechanism (7) comprises a first cooler (71) and a second cooler (72), the first cooler (71) being provided with a first inlet (711), a first outlet (712), a second inlet (713) and a second outlet (714), the gas in the line (2) being able to flow from the first inlet (711) into the first cooler (71) and out from the first outlet (712), and a coolant being able to circulate between the first cooler (71) and the second cooler (72) through the second inlet (713) and the second outlet (714).
3. Dew point test device according to claim 1, characterized in that the flow detector (3) is a gas meter.
4. Dew point test device according to claim 1, characterized in that the first pressure detector (5) and/or the second pressure detector (8) is a pressure sensor.
5. Dew point test device according to claim 1, characterized in that the first temperature detector (6) and/or the second temperature detector (9) is a thermocouple.
6. Dew point test unit according to claim 1, characterized in that the collector (10) is a balance.
7. Dew point test unit as claimed in claim 1, characterized in that the timer (11) is a stopwatch.
8. A dew point testing method based on the dew point testing device of any one of claims 1-7, the dew point testing method comprising:
s1, measuring the flow rate of gas before humidification and recording as S;
s2, humidifying the gas;
s3, measuring the pressure and the temperature of the humidified gas and recording the pressure as P1Temperature is denoted as T1；
S4, processing the humidified gas into saturated gas, measuring the pressure and the temperature of the processed gas, and recording the pressure as P2Temperature is denoted as T2Collecting the mass and time of the condensed liquid water after the humidifying gas treatment, and recording the mass as m and the time as t;
s5, calculating the dew point value T of the gas according to the data obtained in the steps S1-S4dew。
9. Dew point test method as claimed in claim 8, characterized in that in step S5, TdewThe calculation formula of (2) is as follows:
wherein A, B, c are all antoin equation constants.
10. Dew point test method according to claim 8, characterised in that in step S1 the flow rate of the gas before humidification is measured with a flow detector (3) and noted as S;
in step S2, humidifying the gas with a humidifier (4);
in step S3, the pressure of the humidified gas is measured by the first pressure detector (5) and recorded as P1The temperature of the humidified gas is measured by means of a first temperature detector (6) and is denoted T1；
In step S4, the humidified gas is treated as a saturated gas by a cooling mechanism (7), and the pressure of the treated gas is measured by a second pressure detector (8) and recorded as P2The temperature of the treated gas is measured by a second temperature detector (9) and is recorded as T2The mass and the time of the condensed liquid water after the humidifying gas treatment are collected by a collector (10) and a timer (11), respectively, and the mass is recorded as m, and the time is recorded as t.
Technical Field
The invention relates to the technical field of dew point testing, in particular to a dew point testing device and a dew point testing method.
Background
Dew point, also known as dew point temperature, is the temperature to which, in meteorology, gaseous water contained in air is saturated and condensed into liquid water at a fixed pressure. At this temperature, the condensed water floats in the air and is called mist, and when it sticks to a solid surface, it is called dew point.
As a clean energy source, a fuel cell has been paid more and more attention in recent years, and particularly with the industrialization and mass production of fuel cells or systems, the accuracy and controllability of the operating conditions of a fuel cell stack or a system have been paid more and more attention, and particularly, the testing of the dew point temperature of a humidified reaction gas has been a great problem, and a currently commonly used device for determining the dew point of a humidified gas is a dew point meter.
However, the dew point of the gas is tested by using a dew point meter, and one problem is that the dew point meter is generally expensive and the test and use cost is high; the second problem is that when the conventional dew point meter is used for continuously testing high-humidity gas, the dew point meter is prone to generate sudden change of humidity due to the fact that water drops are easily condensed on a dew point meter testing wafer, and the test result is deviated, so that the test is often distorted.
Therefore, a new dew point testing device is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a dew point testing device which can reduce testing cost, improve testing precision and avoid deviation of a testing result.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dew point testing device comprising:
a controller;
the pipeline is used for introducing gas;
the flow detector, the humidifier and the cooling mechanism are sequentially arranged on the pipeline;
a first pressure detector and a first temperature detector both disposed between the humidifier and the cooling mechanism;
a second pressure detector and a second temperature detector both provided on an outlet side of the cooling mechanism;
the collector is arranged at the outlet side of the cooling mechanism and is used for collecting condensed liquid water after the humidifying gas is treated and detecting the quality of the liquid water;
the timer is used for recording the time of condensing liquid water after the humidifying gas is treated;
the flow rate detector, the humidifier, the first pressure detector, the first temperature detector, the cooling mechanism, the second pressure detector, and the second temperature detector are all electrically connected to the controller.
Preferably, the cooling mechanism includes a first cooler and a second cooler, the first cooler is provided with a first inlet, a first outlet, a second inlet and a second outlet, the gas in the pipeline can flow into the first cooler from the first inlet and flow out from the first outlet, and the coolant can circulate between the first cooler and the second cooler through the second inlet and the second outlet.
Preferably, the flow detector is a gas flow meter.
Preferably, the first pressure detector and/or the second pressure detector is/are a pressure sensor.
Preferably, the first temperature detector and/or the second temperature detector is a thermocouple.
Preferably, the collector is a balance.
Preferably, the timer is a stopwatch.
A dew point testing method based on the above dew point testing device, the dew point testing method comprising:
s1, measuring the flow rate of gas before humidification and recording as S;
s2, humidifying the gas;
s3, measuring the pressure and the temperature of the humidified gas and recording the pressure as P1Temperature is denoted as T1；
S4, processing the humidified gas into saturated gas, measuring the pressure and the temperature of the processed gas, and recording the pressure as P2Temperature is denoted as T2Collecting the mass and time of the condensed liquid water after the humidifying gas treatment, and recording the mass as m and the time as t;
s5, calculating the dew point value T of the gas according to the data obtained in the steps S1-S4dew。
Preferably, in step S5, TdewThe calculation formula of (2) is as follows:
wherein A, B, c are all antoin equation constants.
Preferably, in step S1, the flow rate of the gas before humidification is measured by a flow detector and recorded as S;
in step S2, humidifying the gas with a humidifier;
in step S3, the pressure of the humidified gas is measured by a first pressure detector and recorded as P1Measuring the temperature of the humidified gas by means of a first temperature detector and recording the temperature as T1；
In step S4, the humidified gas is treated as a saturated gas by a cooling mechanism, and the pressure of the treated gas is measured by a second pressure detector and recorded as P2The temperature of the treated gas is measured by a second temperature detector and is recorded as T2And respectively collecting the mass and the time of the condensed liquid water after the humidifying gas treatment by using a collector and a timer, and recording the mass as m and the time as t.
Compared with the prior art, the dew point testing device and the testing method provided by the invention have the beneficial effects that:
the dew point testing device provided by the invention comprises the steps of firstly, measuring the flow speed S of gas before humidification by using a flow detector, then humidifying the gas by using a humidifier, and measuring the pressure P of the humidified gas by using a first pressure detector1Measuring the temperature T of the humidified gas by means of a first temperature detector1Then the humidified gas is treated into saturated gas by a cooling mechanism, and the pressure P of the treated gas is measured by a second pressure detector2Measuring the temperature T of the treated gas with a second temperature detector2Collecting the mass m and time t of the condensed liquid water after the humidification gas treatment by using a collector and a timer respectively, and finally passing through S, P1、T1、P2、T2M and T, and the thermodynamic basic equation and the ideal gas equation to calculate the dew point value T of the humidified gasdew. The dew point testing device provided by the invention has a simple structure, is convenient and practical, and can test the dew point value T of the humidified gas under the condition of not using a dew point meterdewThe method is not only beneficial to reducing the testing cost, but also beneficial to improving the testing precision and avoiding the deviation of the testing result.
Drawings
FIG. 1 is a schematic diagram of a dew point test apparatus provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cooling mechanism provided by an embodiment of the present invention;
FIG. 3 is a flow chart of a dew point testing method provided by an embodiment of the invention.
In the figure:
1-a controller;
2-pipeline;
3-a flow detector;
4-a humidifier;
5-a first pressure detector;
6-a first temperature detector;
7-a cooling mechanism; 71-a first cooler; 711 — first inlet; 712-a first outlet; 713-a second inlet; 714-a second outlet; 72-a second cooler;
8-a second pressure detector;
9-a second temperature detector;
10-a collector;
11-timer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a dew point testing apparatus, which can be applied to the field of measuring the gas humidification dew point of a fuel cell, such as calibrating the gas humidification of a fuel cell engine system, calibrating the humidification capability of a testing platform of the fuel cell system, and the like. Specifically, the dew point testing device includes a controller 1, a piping 2, a flow rate detector 3, a humidifier 4, a first pressure detector 5, a first temperature detector 6, a cooling mechanism 7, a second pressure detector 8, a second temperature detector 9, a collector 10, and a timer 11. Wherein the pipeline 2 is used for introducing gas. The flow rate detector 3, the humidifier 4, and the cooling mechanism 7 are sequentially provided on the pipe 2. Both the first pressure detector 5 and the first temperature detector 6 are provided between the humidifier 4 and the cooling mechanism 7. Both the second pressure detector 8 and the second temperature detector 9 are provided on the outlet side of the cooling mechanism 7. A collector 10 is provided on the outlet side of the cooling mechanism 7 for collecting the liquid water condensed after the humidified gas treatment and detecting the quality of the liquid water. The timer 11 is used to record the time for condensing the liquid water after the humidification gas treatment. The flow rate detector 3, the humidifier 4, the first pressure detector 5, the first temperature detector 6, the cooling mechanism 7, the second pressure detector 8, and the second temperature detector 9 are all electrically connected to the controller 1. Of course, it is also possible to electrically connect the collector 10 and the timer 11 with the controller 1 as well.
The working principle of the dew point testing device provided by the embodiment is as follows: first, the flow rate detector 3 is usedMeasuring the flow rate S of the gas before humidification, humidifying the gas by a humidifier 4, and measuring the pressure P of the humidified gas by a first pressure detector 51Measuring the temperature T of the humidified gas by means of a first temperature detector 61Then the humidified gas is treated into a saturated gas by the cooling mechanism 7, and the pressure P of the treated gas is measured by the second pressure detector 82Measuring the temperature T of the treated gas by means of a second temperature detector 92The mass m and time t of the condensed liquid water after humidification gas treatment are collected by collector 10 and timer 11, respectively, and finally pass through S, P1、T1、P2、T2M and T, and the thermodynamic basic equation and the ideal gas equation to calculate the dew point value T of the humidified gasdew。
The dew point testing device provided by the embodiment has a simple structure, is convenient and practical, and can test the dew point value T of the humidified gas under the condition of not using a dew point meterdewThe method is not only beneficial to reducing the testing cost, but also beneficial to improving the testing precision and avoiding the deviation of the testing result.
As shown in fig. 2, the cooling mechanism 7 provided in the present embodiment includes a
Specifically, in the present embodiment, the flow detector 3 is a gas flow meter. The first pressure detector 5 and the second pressure detector 8 are both pressure sensors. The first temperature detector 6 and the second temperature detector 9 are both thermocouples. The collector 10 is a balance. The timer 11 is a stopwatch. Gas flowmeterThe pressure sensor, the thermocouple, the balance and the stopwatch are common test equipment, the price is low, the test cost is reduced, the technology is mature, the test data is reliable, and the improvement of the dew point value T of the humidified gas is facilitateddewThe accuracy of (2).
As shown in fig. 3, the present embodiment further provides a dew point testing method, based on the above dew point testing apparatus, the dew point testing method includes:
s1, measuring the flow rate of gas before humidification and recording as S;
s2, humidifying the gas;
s3, measuring the pressure and the temperature of the humidified gas and recording the pressure as P1Temperature is denoted as T1；
S4, processing the humidified gas into saturated gas, measuring the pressure and the temperature of the processed gas, and recording the pressure as P2Temperature is denoted as T2Collecting the mass and time of the condensed liquid water after the humidifying gas treatment, and recording the mass as m and the time as t;
s5, calculating the dew point value T of the gas according to the data obtained in the steps S1-S4dew。
Further, in step S5, TdewThe calculation formula of (2) is as follows:
a, B, c are all constant values of the antoin equation, which can be obtained by looking up a table. S, P obtained in steps S1-S41、T1、P2、T2The values of m and T are substituted into the above formula, the dew point value T of the gas can be calculateddew。
Further, in step S1, the flow rate of the gas before humidification is measured by the flow detector 3 and recorded as S;
in step S2, humidifying the gas with the humidifier 4;
in step S3, the pressure of the humidified gas is measured by the first pressure detector 5 and noted as P1The temperature of the humidified gas is measured by means of a first temperature detector 6 and is denoted T1；
In step S4, the humidified gas is treated as a saturated gas by the cooling mechanism 7, and the pressure of the treated gas is measured by the second pressure detector 8 and recorded as P2The temperature of the treated gas is measured by a second temperature detector 9 and is denoted as T2The mass and time of the condensed liquid water after the humidification gas treatment are collected by the collector 10 and the timer 11, respectively, and the mass is recorded as m, and the time is recorded as t.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
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