Dew point testing device and dew point testing method

Abstract

The present 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 arranged between the humidifier and the cooling mechanism. The second pressure detector and the second temperature detector are arranged on the outlet side of the cooling mechanism. The collector is used to collect liquid water condensed after humidified gas treatment and detect the quality of the liquid water. The timer is used to record the time for condensing liquid water after humidified gas treatment. The dew point testing device provided by the present invention can test the dew point value of humidified gas without using a dew point meter, thereby reducing the testing cost and improving the testing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of dew point testing, and in particular to a dew point testing device and a dew point testing method. Background Art

[0002] Dew point, also known as dew point temperature, refers to the temperature at which the gaseous water in the air reaches saturation and condenses into liquid water under a fixed air pressure. At this temperature, the condensed water floating in the air is called fog, and when it sticks to the solid surface, it is called dew, hence the name dew point.

[0003] As a clean energy, fuel cells have received more and more attention in recent years. Especially with the industrialization and mass production of fuel cells or systems, the accuracy and controllability of the operating conditions of fuel cell stacks or systems have received more and more attention. In particular, the test of the dew point temperature of the reaction gas after humidification has always been a relatively large problem. The commonly used device to determine the dew point of humidified gas is a dew point meter.

[0004] However, there are two problems with using a dew point meter to test the dew point of a gas. One problem is that dew point meters are usually expensive, and the cost of testing is high. The second problem is that when dew point meters on the market continuously test high-humidity gases, water droplets are easily condensed on the dew point meter test chip, causing a sudden change in humidity, which in turn leads to deviations in test results. This often results in test distortion.

[0005] Therefore, a new dew point testing device is urgently needed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a dew point testing device, which can reduce testing costs, improve testing accuracy, and avoid deviations in test results.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A dew point testing device, comprising:

[0009] Controller;

[0010] Pipeline for introducing gas;

[0011] A flow detector, a humidifier and a cooling mechanism are sequentially arranged on the pipeline;

[0012] a first pressure detector and a first temperature detector, both disposed between the humidifier and the cooling mechanism;

[0013] a second pressure detector and a second temperature detector, both of which are arranged at the outlet side of the cooling mechanism;

[0014] A collector, arranged at the outlet side of the cooling mechanism, for collecting liquid water condensed after the humidified gas is treated and detecting the quality of the liquid water;

[0015] A timer for recording the time for condensation of liquid water after humidified gas treatment;

[0016] The flow 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.

[0017] As a preferred embodiment, the cooling mechanism includes a first cooler and a second cooler, and 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 can 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.

[0018] As a preferred solution, the flow detector is a gas flow meter.

[0019] As a preferred solution, the first pressure detector and / or the second pressure detector is a pressure sensor.

[0020] As a preferred solution, the first temperature detector and / or the second temperature detector is a thermocouple.

[0021] As a preferred solution, the collector is a balance.

[0022] As a preferred solution, the timer is a stopwatch.

[0023] A dew point testing method, based on the dew point testing device as described above, the dew point testing method comprises:

[0024] S1. Measure the flow rate of the gas before humidification and record it as S;

[0025] S2. Humidify the gas;

[0026] S3. Measure the pressure and temperature of the humidified gas, and record the pressure as P1 and the temperature as T1;

[0027] S4. Treat the humidified gas to be saturated gas, measure the pressure and temperature of the treated gas, record the pressure as P2, record the temperature as T2, collect the mass and time of liquid water condensed after the humidified gas treatment, record the mass as m, and record the time as t;

[0028] S5. Calculate the dew point value T of the gas based on the data obtained in steps S1-S4 dew .

[0029] As a preferred solution, in step S5, T dew The calculation formula is:

[0030]

[0031] A, B, and c are all constants of the Antoine equation.

[0032] As a preferred solution, in step S1, a flow rate detector is used to measure the flow rate of the gas before humidification and recorded as S;

[0033] In step S2, the gas is humidified using a humidifier;

[0034] In step S3, the pressure of the humidified gas is measured by a first pressure detector and recorded as P1, and the temperature of the humidified gas is measured by a first temperature detector and recorded as T1;

[0035] In step S4, the humidified gas is treated into saturated gas by a cooling mechanism, the pressure of the treated gas is measured by a second pressure detector and recorded as P2, the temperature of the treated gas is measured by a second temperature detector and recorded as T2, and the mass and time of liquid water condensed after the humidified gas is treated are collected by a collector and a timer, respectively, and the mass is recorded as m and the time is recorded as t.

[0036] Compared with the prior art, the dew point test device and test method provided by the present invention have the following beneficial effects:

[0037] The dew point testing device provided by the present invention firstly measures the flow rate S of the gas before humidification by using a flow detector, then humidifies the gas by using a humidifier, measures the pressure P1 of the humidified gas by using a first pressure detector, measures the temperature T1 of the humidified gas by using a first temperature detector, and then processes the humidified gas into saturated gas by using a cooling mechanism, measures the pressure P2 of the processed gas by using a second pressure detector, measures the temperature T2 of the processed gas by using a second temperature detector, collects the mass m and time t of the liquid water condensed after the humidified gas is processed by using a collector and a timer respectively, and finally calculates the dew point value T of the humidified gas by using S, P1, T1, P2, T2, m and t as well as the basic thermodynamic equation and the ideal gas equation. dew The dew point test device provided by the present invention has a simple structure, is convenient and practical, and can test the dew point value T of the humidified gas without using a dew point meter. dew It is not only helpful to reduce the test cost, but also helpful to improve the test accuracy and avoid deviation in the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a dew point testing device provided by an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of a cooling mechanism provided by an embodiment of the present invention;

[0040] Figure 3 It is a flow chart of the dew point testing method provided by an embodiment of the present invention.

[0041] In the figure:

[0042] 1- Controller;

[0043] 2-Pipeline;

[0044] 3-Flow detector;

[0045] 4- Humidifier;

[0046] 5- first pressure detector;

[0047] 6- a first temperature detector;

[0048] 7-cooling mechanism; 71-first cooler; 711-first inlet; 712-first outlet; 713-second inlet; 714-second outlet; 72-second cooler;

[0049] 8- second pressure detector;

[0050] 9- a second temperature detector;

[0051] 10- Collector;

[0052] 11- Timer. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1As shown, this embodiment provides a dew point test device, which can be applied to the measurement field of fuel cell gas humidification dew point, such as the calibration of fuel cell engine system gas humidification, the calibration of fuel cell system test bench humidification capacity, etc. Specifically, the dew point test device includes a controller 1, a pipeline 2, a flow 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. Among them, the pipeline 2 is used to pass gas. The flow detector 3, the humidifier 4 and the cooling mechanism 7 are arranged on the pipeline 2 in sequence. Both the first pressure detector 5 and the first temperature detector 6 are arranged between the humidifier 4 and the cooling mechanism 7. Both the second pressure detector 8 and the second temperature detector 9 are arranged on the outlet side of the cooling mechanism 7. The collector 10 is arranged on the outlet side of the cooling mechanism 7, and is used to collect the liquid water condensed after the humidified gas is treated and detect the quality of the liquid water. The timer 11 is used to record the time of condensation of liquid water after the humidified gas is treated. The flow 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, the collector 10 and the timer 11 can also be electrically connected to the controller 1.

[0055] The working principle of the dew point test device provided in this embodiment is as follows: first, the flow rate S of the gas before humidification is measured by the flow detector 3, and then the gas is humidified by the humidifier 4, and the pressure P1 of the humidified gas is measured by the first pressure detector 5, and the temperature T1 of the humidified gas is measured by the first temperature detector 6, and then the humidified gas is treated into saturated gas by the cooling mechanism 7, and the pressure P2 of the treated gas is measured by the second pressure detector 8, and the temperature T2 of the treated gas is measured by the second temperature detector 9, and the mass m and time t of the liquid water condensed after the humidified gas is treated are collected by the collector 10 and the timer 11 respectively, and finally the dew point value T of the humidified gas is calculated by S, P1, T1, P2, T2, m and t as well as the basic thermodynamic equation and the ideal gas equation. dew .

[0056] The dew point test device provided in this embodiment has a simple structure, is convenient and practical, and can test the dew point value T of the humidified gas without using a dew point meter. dew It is not only helpful to reduce the test cost, but also helpful to improve the test accuracy and avoid deviation in the test results.

[0057] like Figure 2As shown, the cooling mechanism 7 provided in this embodiment includes a first cooler 71 and a second cooler 72, and the first cooler 71 is provided with a first inlet 711, a first outlet 712, a second inlet 713 and a second outlet 714. The gas in the pipeline 2 can flow into the first cooler 71 from the first inlet 711 and can flow out from the first outlet 712, and the coolant can circulate between the first cooler 71 and the second cooler 72 through the second inlet 713 and the second outlet 714. That is, the first cooler 71 has four inlets and outlets, wherein the second inlet 713 and the second outlet 714 are the inlets and outlets of the coolant, and these two inlets and outlets form a passage to play a cooling role of the cooling mechanism, wherein the first inlet 711 and the first outlet 712 are the inlets and outlets of the cooled gas.

[0058] Specifically, in this 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. The gas flow meter, pressure sensor, thermocouple, balance and stopwatch are all common test equipment, which are not only relatively cheap, which is conducive to reducing the test cost, but also the technology is relatively mature, the test data is relatively reliable, which is conducive to improving the dew point value T of the humidified gas. dew accuracy.

[0059] like Figure 3 As shown, this embodiment also provides a dew point testing method. Based on the above-mentioned dew point testing device, the dew point testing method includes:

[0060] S1. Measure the flow rate of the gas before humidification and record it as S;

[0061] S2. Humidify the gas;

[0062] S3. Measure the pressure and temperature of the humidified gas, and record the pressure as P1 and the temperature as T1;

[0063] S4. Treat the humidified gas to be saturated gas, measure the pressure and temperature of the treated gas, record the pressure as P2, record the temperature as T2, collect the mass and time of liquid water condensed after the humidified gas treatment, record the mass as m, and record the time as t;

[0064] S5. Calculate the dew point value T of the gas based on the data obtained in steps S1-S4 dew .

[0065] Furthermore, in step S5, T dew The calculation formula is:

[0066]

[0067] Where A, B, and c are all constants of the Antoine equation, which can be obtained by looking up the table. Substitute the values ​​of S, P1, T1, P2, T2, m, and t obtained in steps S1-S4 into the above formula to calculate the dew point value T of the gas. dew .

[0068] Further, in step S1, the flow rate of the gas before humidification is measured by the flow detector 3 and recorded as S;

[0069] In step S2, the gas is humidified by using a humidifier 4;

[0070] In step S3, the pressure of the humidified gas is measured by the first pressure detector 5 and recorded as P1, and the temperature of the humidified gas is measured by the first temperature detector 6 and recorded as T1;

[0071] In step S4, the humidified gas is treated into saturated gas by the cooling mechanism 7, the pressure of the treated gas is measured by the second pressure detector 8 and recorded as P2, the temperature of the treated gas is measured by the second temperature detector 9 and recorded as T2, and the mass and time of liquid water condensed after the humidified gas is treated 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.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A dew point testing device, characterized in that: include: Controller (1); Pipeline (2) for introducing gas; A flow detector (3), a humidifier (4) and a cooling mechanism (7) are sequentially arranged on the pipeline (2); a first pressure detector (5) and a first temperature detector (6), both of which are arranged between the humidifier (4) and the cooling mechanism (7); a second pressure detector (8) and a second temperature detector (9), both of which are arranged on the outlet side of the cooling mechanism (7); A collector (10) is arranged at the outlet side of the cooling mechanism (7) and is used to collect liquid water condensed after the humidified gas is treated and detect the quality of the liquid water; A timer (11) for recording the time for condensation of liquid water after humidified gas treatment; The flow 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); the collector 10 and the timer 11 are both electrically connected to the controller 1; The cooling mechanism (7) comprises a first cooler (71) and a second cooler (72); the first cooler (71) is provided with a first inlet (711), a first outlet (712), a second inlet (713) and a second outlet (714); the gas in the pipeline (2) can flow into the first cooler (71) through the first inlet (711) and can flow out through the first outlet (712); the coolant can circulate between the first cooler (71) and the second cooler (72) through the second inlet (713) and the second outlet (714).

2. The dew point testing device according to claim 1, characterized in that: The flow detector (3) is a gas flow meter.

3. The dew point testing device according to claim 1, characterized in that: The first pressure detector (5) and / or the second pressure detector (8) is a pressure sensor.

4. The dew point testing device according to claim 1, characterized in that: The first temperature detector (6) and / or the second temperature detector (9) is a thermocouple.

5. The dew point testing device according to claim 1, characterized in that: The collector (10) is a balance.

6. The dew point testing device according to claim 1, characterized in that: The timer (11) is a stopwatch.

7. A dew point testing method, characterized in that: Based on the dew point testing device according to any one of claims 1 to 6, the dew point testing method comprises: S1. Measure the flow rate of the gas before humidification and record it as S; S2. Humidify the gas; S3. Measure the pressure and temperature of the humidified gas, and record the pressure as P1 and the temperature as T1; S4. Treat the humidified gas to be saturated gas, measure the pressure and temperature of the treated gas, record the pressure as P2, record the temperature as T2, collect the mass and time of liquid water condensed after the humidified gas treatment, record the mass as m, and record the time as t; S5. Calculate the dew point value T of the gas based on the data obtained in steps S1-S4 dew .

8. The dew point testing method according to claim 7, characterized in that: In step S5, T dew The calculation formula is: A, B, and c are all constants of the Antoine equation.

9. The dew point testing method according to claim 7, characterized in that: In step S1, the flow rate of the gas before humidification is measured by using a flow detector (3) and recorded as S; In step S2, the gas is humidified using a humidifier (4); In step S3, the pressure of the humidified gas is measured by a first pressure detector (5) and recorded as P1, and the temperature of the humidified gas is measured by a first temperature detector (6) and recorded as T1; In step S4, the humidified gas is treated into saturated gas by using a cooling mechanism (7), the pressure of the treated gas is measured by using a second pressure detector (8) and recorded as P2, the temperature of the treated gas is measured by using a second temperature detector (9) and recorded as T2, and the mass and time of liquid water condensed after the humidified gas is treated are collected by using a collector (10) and a timer (11), respectively, and the mass is recorded as m and the time is recorded as t.

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