CN113358696A - Dew point temperature detection device and method for fuel cell - Google Patents
Dew point temperature detection device and method for fuel cell Download PDFInfo
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- CN113358696A CN113358696A CN202110911599.4A CN202110911599A CN113358696A CN 113358696 A CN113358696 A CN 113358696A CN 202110911599 A CN202110911599 A CN 202110911599A CN 113358696 A CN113358696 A CN 113358696A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
- G01N25/70—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point by varying the temperature of the material, e.g. by compression, by expansion
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
Abstract
The invention relates to a dew point temperature detection device for a fuel cell, belongs to the technical field of dew point temperature detection, and solves the problem that the prior art cannot overcome the influence of the difference between the temperature of air to be detected and the temperature of a mirror surface on the detection precision of the dew point temperature. The device includes: the controllable electromagnetic valve is used for inputting air to be detected of the air stacking pipeline into the optical temperature detection equipment after being opened according to a detection instruction of a user; the optical temperature detection equipment is used for detecting the temperature of air to be detected and the temperature of the mirror surface in real time; and regulating and controlling the temperature of the optical reflector according to the temperature difference of the two temperatures, and stopping regulating and controlling according to the real-time temperature change of the air to be measured in the regulating and controlling process; and after the regulation and control are finished, the moment when the temperature fluctuation amplitude of the optical reflector surface is within a preset range in a preset time period is obtained, and the dew point temperature of the air to be measured is obtained. The influence of the temperature difference between the air to be measured and the mirror surface on the dew point temperature detection precision is effectively eliminated, and the device has the function of measuring at any time.
Description
Technical Field
The invention relates to the technical field of dew point temperature detection, in particular to a dew point temperature detection device and a dew point temperature detection method for a fuel cell.
Background
With the continuous development of new energy technology, the position of fuel cells in new energy is increasing. The fuel cell works on the principle that hydrogen and oxygen in the air react inside the stack to generate water. Dew point temperature detection is critical to long-term stable, reliable operation of fuel cells.
At present, the prior art has lower detection precision for the dew point temperature of the fuel cell. In patent document CN 212391420U, after passing the gas to be measured through a cooling mechanism, the condensed liquid water is collected, a balance is used to weigh the mass of the liquid water, the time for generating condensed water, the temperature and pressure before and after the gas is condensed are recorded, and the thermodynamic basic equation and the ideal gas equation are used to calculate the dew point temperature of the gas to be measured. However, because the measured gas is not in a saturated state, the mass of the condensed liquid water is small, the method has high requirement on the acquisition precision of the balance, the timeliness of data acquisition has great influence on the detection precision, and secondly, the later maintenance cost is high for ensuring the reading calibration of the balance after multiple times of weighing; when the cooling mechanism is used for cooling, an additional external cooling source system is required to be provided for cooling, and the user experience is poor.
At present, a new dew point temperature detection device and a new dew point temperature detection method which can effectively overcome the influence of the difference between the temperature of the air to be detected and the temperature of the mirror surface on the detection precision of the dew point temperature and have higher detection precision are lacked.
Disclosure of Invention
The invention aims to provide a dew point temperature detection device and a dew point temperature detection method for a fuel cell, which are used for solving the problem that the prior art cannot overcome the influence of the difference between the temperature of air to be detected and the temperature of a mirror surface on the dew point temperature detection precision.
In one aspect, an embodiment of the present invention provides a dew point temperature detecting device for a fuel cell, including:
the controllable electromagnetic valve is arranged at the front end of the optical temperature detection equipment and used for inputting air to be detected of the air stacking pipeline into the optical temperature detection equipment after being opened according to a detection instruction of a user;
the optical temperature detection equipment is used for detecting the temperature of the air to be detected and the mirror surface of the optical reflector in real time; comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be measured in the regulating and controlling process; and after the regulation is finished, acquiring the temperature fluctuation amplitude of the optical reflector surface within a preset time period from the regulation finishing time, identifying whether the temperature fluctuation amplitude is within a preset range, if so, acquiring the effective value of the air to be detected within the preset time period as the dew point temperature, otherwise, continuously executing the temperature fluctuation amplitude identification at the next time after the regulation finishing time until the dew point temperature is obtained.
The beneficial effects of the above technical scheme are as follows: whether the influence of the temperature of the air to be detected and the temperature difference of the mirror surface on the dew point temperature detection precision in the regulation and control process is eliminated or not can be judged through the real-time temperature change of the air to be detected, the dew point temperature detection device is simple in structure and low in cost, has a movable function, and can realize the function of being used and measured on a fuel cell system.
Based on the further improvement of the device, the dew point temperature checking device is positioned on the parallel branch of the fuel cell air inlet stack pipeline or is directly connected in series on the fuel cell air inlet stack pipeline.
The beneficial effects of the above further improved scheme are: the dew point temperature inspection device is positioned on the parallel branch of the fuel cell air in-stack pipeline, so that the problem that the gas pressure of the pipeline to be detected is changed due to the installation of the dew point detection device can be effectively avoided, and the dew point temperature inspection device is suitable for occasions with high requirements on insertion flow resistance. When the requirement on the insertion flow resistance is not high, the dew point detection device can also be directly connected in series in the reactor air main pipeline.
Further, the number of the controllable electromagnetic valves is 2, and each controllable electromagnetic valve is respectively arranged at the front end and the rear end of the optical temperature detection device; and the number of the first and second electrodes,
and all the controllable electromagnetic valves are simultaneously opened according to the detection instruction of the user, and are simultaneously closed according to the closing instruction of the user after the detection is finished.
The beneficial effects of the above further improved scheme are: according to actual test requirements, an on-line pipeline connection breaking operation can be carried out on the test process of the dew point temperature through the on-off of the controllable electromagnetic valve.
Further, the optical temperature detection apparatus further includes: the device comprises a ventilation pipeline, and a laser emitter, an optical reflector, a photoelectric sensor, a temperature sensor and controllable temperature-regulating and measuring equipment which are positioned in the ventilation pipeline; wherein the content of the first and second substances,
the laser emitter is arranged at the top of the ventilation pipeline; the optical reflector is arranged at a position which forms a preset angle with an incident light path, and the lower end of the optical reflector is connected with the inner wall of the ventilation pipeline; the photoelectric sensor is arranged in the direction of the reflection light path and is bonded with the inner wall of the ventilation pipeline; the temperature sensor is arranged on the surface of the optical reflector; and the output ends of the photoelectric sensor and the temperature sensor are respectively connected with the input end of the controllable temperature-regulating and measuring equipment.
The beneficial effects of the above further improved scheme are: the structure and the arrangement mode of the optical temperature detection equipment are limited. Different with current optics temperature-detecting equipment's structure and function, the optics temperature-detecting equipment of this application still includes air pipe, temperature sensor and controllable temperature measurement equipment that adjusts the temperature, combines corresponding method can effectively eliminate the influence of the air temperature that awaits measuring and mirror surface temperature difference to dew point temperature detection precision, greatly improves and detects the precision.
Further, the temperature-controllable temperature-adjusting and measuring device further comprises:
an analysis and calculation unit for analyzing all the received electrical signals to obtain the temperature of the air to be measured and the temperature of the mirror surface of the optical reflector in real time, and comparing the two temperatures to obtain the temperature differenceTWill be describedTSending the data to a control unit;
a control unit for depending on the ΔTWhen the execution unit is startedTWhen the temperature is higher than 0, the execution unit is started to heat the optical reflector continuously, and the air to be measured is obtained from the heating moment and within the preset time period while heatingThe large temperature change is used for judging whether the temperature difference is eliminated according to the maximum temperature changeTIf so, controlling the execution unit to stop heating and sending a starting instruction to the temperature calculation unit, otherwise, continuing to judge the next moment of the heating moment until the temperature difference is zero; when anTWhen the temperature of the optical reflector is less than 0, starting an execution unit for refrigeration to continuously reduce the temperature of the optical reflector, and simultaneously obtaining the maximum temperature change of the air to be detected within a preset time period from the refrigeration moment at regular time until the maximum temperature change exceeds a preset threshold value, controlling the execution unit to stop refrigeration and start heating, and controlling the execution unit to stop heating and sending a starting instruction to a temperature calculation unit when heating is continuously carried out until the temperature of the air to be detected is identified to recover to a corresponding calibration temperature after incident light is reflected by liquid water;
the execution unit is arranged on the mirror surface or the back surface of the optical reflector uniformly and used for continuously cooling or heating the optical reflector after being started;
the temperature calculation unit is used for acquiring temperature fluctuation amplitudes of the optical reflector surface at a plurality of moments in a preset time period from the regulation and control ending moment after starting, identifying whether each temperature fluctuation amplitude is in a preset range, and if so, acquiring an effective value of air to be detected in the preset time period as a dew point temperature; otherwise, continuing to identify at the subsequent moment of the current moment until each temperature fluctuation amplitude is within a preset range.
The beneficial effects of the above further improved scheme are: the structure of the temperature-controllable temperature-regulating and measuring equipment is limited, and how each component unit is matched with the temperature-controllable temperature-regulating and measuring equipment to calculate the temperature. Eliminate the temperature differenceTAnd the precision correction is also carried out after the influence (condensation and frost) of the dew point temperature detection, so that the real-time dew point temperature of the air to be detected can be accurately obtained.
Further, the execution unit comprises 2 semiconductor refrigeration pieces; wherein the content of the first and second substances,
the heating surface of one semiconductor refrigerating sheet is tightly attached to the mirror surface of the optical reflector and used for heating the optical reflector after being started; and the refrigerating surface of the other semiconductor heating sheet is tightly attached to the mirror surface of the optical reflector and used for cooling the optical reflector after starting.
The beneficial effects of the above further improved scheme are: the structure and the installation mode of the execution unit are limited, and all functions can be realized only by adopting 2 semiconductor refrigeration pieces. Compare the background art, can effectively reduce dew point temperature detection device's volume and cost, make its portable.
Further, the control unit executes the following program to regulate and control the temperature:
get aTIs judged to beTWhether greater than 0;
if anTWhen the temperature difference is larger than 0, the execution unit is started to heat the optical reflector continuously, the maximum temperature change in the preset time period from the heating moment of the air to be measured is obtained at regular time while heating, and whether the temperature difference is eliminated is judged according to the maximum temperature changeTThe influence on the dew point temperature detection, if the maximum temperature change exceeds a preset threshold value, the temperature difference is judged to be eliminatedTControlling the execution unit to stop heating immediately and sending a starting instruction to the temperature calculation unit for the influence on the detection of the dew point temperature, otherwise, obtaining the maximum temperature change of the air to be detected in a preset time period from the next moment of the heating moment again, and executing the judgment of the next moment until the fact that the temperature difference is equal toTThe temperature regulation is finished due to the influence on the dew point temperature detection;
if anTWhen the temperature of the optical reflector is less than 0, starting an execution unit for refrigeration to continuously reduce the temperature of the optical reflector, and acquiring the maximum temperature change of the air to be measured in a preset time period from the refrigeration moment at the same time of refrigeration, until the maximum temperature change exceeds the change of a preset threshold value, controlling the execution unit to stop refrigeration and start heating; the method comprises the steps that the real-time temperature of air to be measured is obtained regularly in the heating process, and when the real-time temperature of the air to be measured is recovered to a corresponding calibration temperature after incident light is reflected by liquid water, an execution unit is controlled to stop heating, and a starting instruction is sent to a temperature calculating unit;
if anTAnd =0, directly sending a starting instruction to the temperature calculating unit.
Advantageous effects of the above-described further improvementThe method comprises the following steps: the method for controlling the temperature by the control unit is limited, and a large number of tests prove that the temperature difference can be effectively eliminatedTThe influence on the dew point temperature detection is convenient for obtaining accurate dew point temperature subsequently.
Further, the temperature calculating unit executes the following procedure to obtain the dew point temperature:
after starting, the starting time is sequentially acquirednObtaining the maximum value and the minimum value of the mirror surface temperature of the optical reflector in adjacent equal interval time periods to obtain the fluctuation range of the mirror surface temperature in each time period;
identifying whether the fluctuation range of the temperature of the mirror surface is within a preset range in each time period, if so, starting the mirror surface at the later momentnThe effective value of the air to be measured in adjacent equal interval time periods is used as the dew point temperature; otherwise, continuing to identify the next moment until continuing to identify the next momentnAnd obtaining the dew point temperature until each temperature fluctuation amplitude in the adjacent equal interval time periods is within a preset range.
The beneficial effects of the above further improved scheme are: after the temperature regulation and control are finished, a method for acquiring accurate dew point temperature by a temperature calculating unit is limited. The influence caused by environmental factors can be effectively eliminated by measuring the mirror surface temperature for many times, and the accurate dew point temperature is obtained.
Further, the dew point temperatureT dewObtained by the following formula
T dew=（T max+T min）/2
In the formula (I), the compound is shown in the specification,T maxto initially satisfynThe maximum temperature of the air to be measured with the surface temperature fluctuation range in the preset range in each adjacent equal interval time period;T minto initially satisfynAnd the lowest temperature of the air to be measured, wherein the fluctuation range of the temperature of the mirror surface is in a preset range in each adjacent equal interval time period.
The beneficial effects of the above further improved scheme are: the calculation method of the dew point temperature is limited, and the method is simple and effective.
In another aspect, an embodiment of the present invention provides a method for detecting a dew point temperature of a fuel cell, including:
building a dew point temperature detection device for the fuel cell on a parallel branch or a series branch of an air stacking pipeline of the fuel cell; the dew point temperature detection device comprises a controllable electromagnetic valve and an optical temperature detection device which are connected in sequence;
opening a controllable electromagnetic valve, and inputting air to be detected of air entering a reactor pipeline into optical temperature detection equipment;
respectively detecting the temperature of air to be detected and the temperature of the mirror surface of an optical reflector in optical temperature detection equipment in real time, comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be detected in the regulating and controlling process;
after the regulation is finished, acquiring the temperature fluctuation amplitude of the optical reflector surface within a preset time period from the regulation finishing time, identifying whether the temperature fluctuation amplitudes are all within a preset range, and if so, acquiring the effective value of the air to be measured within the preset time period as the dew point temperature; otherwise, the temperature fluctuation amplitude identification at the later moment of the regulation and control ending moment is continuously executed until the dew point temperature is obtained.
The beneficial effect who adopts above-mentioned scheme is: a method for effectively performing dew point temperature detection is defined. Whether the influence of the temperature difference between the air to be detected and the mirror surface temperature on the dew point temperature detection precision in the regulation and control process is eliminated can be judged through the real-time temperature change of the air to be detected, the dew point temperature detection method is simple, the cost is low, and the random detection on the fuel cell system can be realized.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a schematic view showing the structure of a dew point temperature detecting apparatus according to embodiment 1 of the present invention;
FIG. 2 is a graph showing the change in the mirror temperature and the air temperature in example 1 of the present invention;
FIG. 3 is a schematic structural view showing a dew point temperature detecting apparatus according to embodiment 2 of the present invention;
FIG. 4 is a schematic structural diagram of an optical temperature detection device according to embodiment 2 of the present invention;
fig. 5 shows a schematic diagram of the dew point temperature detection process in embodiment 2 of the present invention.
Reference numerals:
T-mirror temperature;T-dew-point temperature;ttime-time.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
To describe the embodiments more clearly, first, the physical theory involved in the present invention is briefly described.
Incident light is reflected by the mirror surface and received by the photoelectric sensor of the optical temperature detection equipment, and air to be detected passes through the mirrorAt the time of noodle due to air temperatureT 1Temperature of mirror surfaceT 2In contrast, a series of changes, such as condensation or frost, may occur on the mirror surface.
In particular, whenT 1AboveT 2When the temperature of the mirror surface is continuously increased, the condensation phenomenon begins to occur on the mirror surface, and after incident light is reflected by the mirror surface containing liquid water, signals received by the photoelectric sensor change, so that the mirror surface needs to be continuously heated; when the mirror surface temperature is highT 2After the temperature gradually rises, the condensation phenomenon on the mirror surface begins to disappear gradually, after the liquid water on the mirror surface completely disappears (the maximum temperature change in a preset time period before the current time of the air to be measured exceeds a threshold value), the heating of the mirror surface needs to be stopped, and when the temperature of the air to be measured exceeds the threshold value, the heating is stoppedT 1When the calibration temperature of the incident light reflected by the liquid water is recovered and the fluctuation of the mirror surface temperature is small, the temperature collected by the mirror surface sensor is the dew point temperature of the air.
When in useT 1Is lower thanT 2When the temperature of the mirror surface begins to drop gradually, the mirror surface begins to be cooled, and when the temperature of the mirror surface begins to dropT 2Lower than air temperatureT 1When the temperature of the mirror surface is higher than the set temperature, the liquid water on the mirror surface is cooled to a temperature higher than the set temperature, and the liquid water is condensed on the mirror surface to cool the mirror surfaceT 1When the temperature is restored to the calibrated temperature after the incident light is reflected by the liquid water and the feedback temperature fluctuation of the temperature sensor on the mirror surface is small, the temperature collected by the temperature sensor is the dew point temperature of the air.
Example 1
An embodiment of the present invention discloses a dew point temperature detecting device for a fuel cell, which comprises a controllable electromagnetic valve and an optical temperature detecting device connected in sequence, as shown in fig. 1.
The controllable electromagnetic valve is arranged at the front end of the optical temperature detection equipment and used for inputting air to be detected of an air inlet pipe (a section of pipe before the air enters the electric pile) of the fuel cell into the optical temperature detection equipment after being opened according to a detection instruction of a user.
The optical temperature detection equipment is used for detecting the temperature of the air to be detected and the mirror surface of the optical reflector in real time; comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be measured in the regulating and controlling process; and after the regulation is finished, acquiring the temperature fluctuation amplitude of the optical reflector surface within a preset time period from the regulation finishing time, identifying whether the temperature fluctuation amplitude is within a preset range, if so, acquiring the effective value of the air to be detected within the preset time period as the dew point temperature, otherwise, continuously executing the temperature fluctuation amplitude identification at the next time after the regulation finishing time until the dew point temperature is obtained.
When the system is implemented, when a user needs dew point temperature detection, the user only needs to connect a dew point temperature detection device on an air reactor pipeline in parallel or in series, a controllable electromagnetic valve is arranged in front of optical temperature detection equipment, the controllable electromagnetic valve is opened, and air before entering the reactor is shunted and then enters the optical temperature detection equipment for air dew point detection; when the dew point temperature detection requirement does not exist, the controllable electromagnetic valve is only required to be closed.
The specific principle is shown in fig. 2, the dotted line represents the temperature of the measured gas, when the temperature of the mirror surface is higher than the dew point temperature of air, liquid water on the mirror surface is vaporized, and when the temperature of the mirror surface is lower than the dew point temperature, the mirror surface is in a liquid water state, namely, a condensation process. When the temperature of the mirror surface is lower than the temperature of the gas to be detected, the moisture in the gas to be detected is retained on the mirror surface in the form of water or frost, and the total reflection on the mirror surface is changed into diffuse emission; or, when the water or frost remained on the mirror surface becomes steam, the diffuse reflection on the mirror surface becomes total reflection, at this time, the signal of the photoelectric receiving element will change drastically, and the temperature difference between the temperature of the measured gas and the temperature of the mirror surface can be considered to be Δ eliminatedT（T 1-T 2) The temperature regulation can be closed to the influence of dew point temperature detection. Then, when the signal (real-time temperature of air to be measured) received by the photoelectric sensor is changed, when the signal is changed once violently, the highest value and the lowest value of the mirror surface temperature can be respectively collected, and the temperature difference value between the highest temperature and the lowest temperature is judged to be used as a temperature waveThe dynamic amplitude; and obtaining the dew point temperature until the temperature fluctuation amplitude is in a preset range.
Compared with the prior art, the dew point temperature detection device for the fuel cell provided by the embodiment has the advantages that the problem of rapidly, conveniently and economically monitoring the dew point temperature of the gas is solved, the performance of the galvanic pile can be effectively verified by adjusting the change of the moisture content when the follow-up fuel cell system is matched and verified, and the accuracy and the timeliness of the measured data are ensured.
Example 2
The optimization is carried out on the basis of the scheme of the embodiment 1, and when the requirement on the insertion flow resistance is high, the checking device is arranged on a parallel branch of a fuel cell air inlet stack pipeline. When the requirement on the insertion flow resistance is not high, the checking device can be connected with the main reactor air pipeline in series, namely, the dew point detection device is directly connected in series in the main reactor air pipeline.
Preferably, the number of the controllable electromagnetic valves is 2, and the controllable electromagnetic valves are respectively arranged at the front end and the rear end of the optical temperature detection equipment; and all the controllable electromagnetic valves are opened simultaneously according to the detection instruction of the user, and are closed simultaneously according to the closing instruction of the user after the detection is finished. Specifically, the input end of the controllable electromagnetic valve 1 is connected with an air reactor pipeline, and the output end of the controllable electromagnetic valve is connected with the input end of the optical temperature detection equipment; the input end of the controllable electromagnetic valve 2 is connected with the output end of the optical temperature detection device, and the output end is connected with the air in-pile pipeline, as shown in fig. 3.
Preferably, the optical temperature detection device comprises a ventilation duct, and a laser transmitter, an optical reflector, a photoelectric sensor, a temperature sensor and a controllable temperature-regulating and temperature-measuring device which are positioned in the ventilation duct, as shown in fig. 4. Optionally, the temperature-controllable temperature-regulating and measuring equipment can also be partially positioned outside the ventilation pipeline.
The laser emitter is arranged at the top of the ventilation pipeline; the optical reflector is arranged at a position which forms a preset angle (generally 30-60 degrees, for example, 45 degrees) with an incident light path (namely the light path of an incident laser signal, which is a fixed direction), and the lower end of the optical reflector is connected with the inner wall of the ventilation pipeline; the photoelectric sensor is arranged in the direction of a reflection light path (namely, the light path for reflecting the laser signal is in a fixed direction), and is adhered to the inner wall of the ventilation pipeline at the top of the ventilation pipeline; the temperature sensor is arranged on the surface of the optical reflector; the output end (actuating mechanism) of the temperature-controllable temperature-regulating and measuring device is bonded with the front or back of the optical reflector. The output ends of the photoelectric sensor and the temperature sensor are respectively connected with the input end of the controllable temperature-regulating and measuring equipment. The actuating mechanisms of the temperature-controllable temperature-regulating and measuring equipment are uniformly distributed on the front or the back of the mirror surface.
And the laser transmitter is used for transmitting the incident laser signal to the optical reflector.
And the optical reflector is used for reflecting the incident laser signal through the optical reflector to generate a reflected laser signal containing the atomization information, and reflecting the reflected laser signal to the photoelectric sensor.
And the photoelectric sensor is used for converting the received reflected laser signals into photoelectric signals to obtain corresponding electric signals and transmitting the electric signals to the temperature-controllable temperature-regulating and measuring equipment.
And the temperature sensor is arranged on the surface of the optical reflector and used for converting the temperature of the optical reflector into a corresponding electric signal and transmitting the electric signal to the temperature-controllable temperature-regulating and measuring equipment.
The controllable temperature adjusting and measuring equipment is used for analyzing the received electric signals respectively to obtain the temperature of the air to be measured at the current moment and the temperature of the optical reflector, comparing the two temperatures and adjusting and controlling the temperature of the optical reflector according to the obtained temperature difference; and obtaining the temperature fluctuation of the optical reflector mirror surface at a plurality of adjacent equal interval moments in a preset time period before the current moment, comparing the temperature fluctuation until all the temperature fluctuation is in a threshold range, and stopping temperature regulation.
Preferably, the temperature-controllable temperature-regulating and measuring equipment further comprises an analysis calculating unit, a control unit, an execution unit and a temperature calculating unit which are connected in sequence. The control end of the temperature calculating unit is connected with the output end of the control unit, and the input end of the temperature calculating unit is connected with the photoelectric sensor and the temperature sensor. And the temperature calculating unit is provided with a display screen and a wireless transceiving module.
The analysis and calculation unit is used for analyzing all the received electric signals and respectively obtaining the temperature and the optical reflection of the air to be measured in real timeThe temperature of the mirror is two temperatures, and the temperature difference of the two temperatures is obtained by comparing the two temperaturesTWill be describedTAnd sending the data to a control unit.
A control unit for depending on the ΔTWhen the execution unit is startedTWhen the temperature is more than 0, the execution unit is started to heat the optical reflector continuously, the maximum temperature change in the preset time period from the heating moment of the air to be measured is obtained while heating, and whether the Δ of the temperature difference is eliminated is judged according to the maximum temperature changeTIf so, judging to eliminate the influence of the temperature difference on the dew point temperature detection, controlling the execution unit to stop heating and sending a starting instruction to the temperature calculation unit, and otherwise, continuing to judge the next moment of the heating moment until the temperature difference is zero; when anTWhen the temperature of the optical reflector is less than 0, starting an execution unit for refrigeration to continuously cool the temperature of the optical reflector, obtaining the maximum temperature change of the air to be measured in a preset time interval from the moment of refrigeration at regular time while refrigerating, controlling the execution unit to stop refrigeration and start heating until the maximum temperature change exceeds the preset threshold value, and controlling the execution unit to stop heating and sending a starting instruction to a temperature calculation unit when heating is continuously carried out until the temperature of the air to be measured is identified to recover to the corresponding calibration temperature after the incident light is reflected by the liquid water.
And the execution units are uniformly distributed on the mirror surface or the back surface of the optical reflector and used for continuously cooling or heating the optical reflector after being started.
The temperature calculation unit is used for acquiring temperature fluctuation amplitudes of the optical reflector at a plurality of moments within a preset time period from the regulation and control ending moment after starting, identifying whether each temperature fluctuation amplitude is within a preset range, and if so, acquiring an effective value of air to be detected within the preset time period as a dew point temperature; otherwise, continuously identifying at the subsequent time of the regulation and control ending time until each temperature fluctuation amplitude is in a preset range, and obtaining the dew point temperature.
Preferably, the execution unit further comprises 2 semiconductor refrigeration pieces; wherein, the heating surface of a semiconductor refrigerating sheet is closely attached to the optical reflectorThe mirror surface of the reflector is used for heating the optical reflector after being started; and the refrigerating surface of the other semiconductor heating sheet is tightly attached to the mirror surface of the optical reflector and used for cooling the optical reflector after starting. By controlling the electrification of the two refrigerating sheets, the temperature of the mirror surface can be controlledT 2。
Preferably, the control unit executes the following program for temperature regulation:
s31 obtaining ΔTIs judged to beTWhether greater than 0;
s32 ΔTWhen the temperature difference is larger than 0, the execution unit is started to heat the optical reflector continuously, the maximum temperature change in the preset time period from the heating moment of the air to be measured is obtained at regular time while heating, and whether the temperature difference is eliminated is judged according to the maximum temperature changeTThe influence on the dew point temperature detection, if the maximum temperature change exceeds a preset threshold value, the temperature difference is judged to be eliminatedTControlling the execution unit to stop heating immediately and sending a starting instruction to the temperature calculation unit for the influence on the detection of the dew point temperature, otherwise, obtaining the maximum temperature change of the air to be detected in a preset time period from the next moment of the heating moment again, and executing the judgment of the next moment until the fact that the temperature difference is equal toTThe temperature regulation is finished due to the influence on the dew point temperature detection;
s33 ΔTWhen the temperature of the optical reflector is less than 0, starting an execution unit for refrigeration to continuously reduce the temperature of the optical reflector, and acquiring the maximum temperature change of the air to be measured in a preset time period from the refrigeration moment at the same time of refrigeration, until the maximum temperature change exceeds the change of a preset threshold value, controlling the execution unit to stop refrigeration and start heating; the method comprises the steps that the real-time temperature of air to be measured is obtained regularly in the heating process, and when the real-time temperature of the air to be measured is recovered to a corresponding calibration temperature after incident light is reflected by liquid water, an execution unit is controlled to stop heating, and a starting instruction is sent to a temperature calculating unit;
s34 ΔTAnd =0, directly sending a starting instruction to the temperature calculating unit.
Preferably, the temperature calculation unit performs the following procedure to obtain the dew point temperature:
s41, after the start-up,after the starting time is acquired in sequencenObtaining the maximum value and the minimum value of the mirror surface temperature of the optical reflector in adjacent equal interval time periods to obtain the fluctuation range of the mirror surface temperature in each time period;
s42, identifying whether the fluctuation range of the surface temperature in each time interval is in the preset range, if so, starting the system after the starting timenThe effective value of the air to be measured in adjacent equal interval time periods is used as the dew point temperature; otherwise, continuing to identify the next moment until continuing to identify the next momentnAnd obtaining the dew point temperature until each temperature fluctuation amplitude in the adjacent equal interval time periods is within a preset range, as shown in figure 5.
Preferably, the dew point temperatureT dewObtained by the following formula
T dew=（T max+T min）/2
In the formula (I), the compound is shown in the specification,T maxto initially satisfynThe maximum temperature of the air to be measured with the surface temperature fluctuation range in the preset range in each adjacent equal interval time period;T minto initially satisfynAnd the lowest temperature of the air to be measured, wherein the fluctuation range of the temperature of the mirror surface is in a preset range in each adjacent equal interval time period.
During implementation, all install controllable solenoid valve at optical temperature check out test set front and back end, if need monitor the dew point temperature of the air that awaits measuring of air income heap pipeline, then open solenoid valve 1, solenoid valve 2, get into dew point temperature detection device and carry out air dew point detection after the air reposition of redundant personnel before the heap, when no dew point temperature detects the demand, only need close two solenoid valves can.
Compared with the embodiment 1, the dew point temperature detection device provided by the embodiment can monitor the gas dew point temperature more accurately, can effectively verify the performance of the galvanic pile by adjusting the change of the moisture content when being used for matching verification of the fuel cell system, and ensures the accuracy and the timeliness of the measured data.
Example 3
The invention also discloses a dew point temperature detection method for the fuel cell, which comprises the following steps:
s1, building a dew point temperature detection device for the fuel cell on a parallel branch or a series branch of an air stacking pipeline of the fuel cell; the dew point temperature detection device comprises a controllable electromagnetic valve and an optical temperature detection device which are connected in sequence;
s2, opening the controllable electromagnetic valve, inputting the air to be detected of the air stacking pipeline into the optical temperature detection equipment;
s3, respectively detecting the temperature of the air to be detected and the temperature of an optical reflector in the optical temperature detection equipment in real time, comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be detected in the regulating and controlling process;
s4, after the regulation and control are finished, acquiring the temperature fluctuation range of the optical reflector in a preset time period from the regulation and control finishing moment, identifying whether the temperature fluctuation range is in a preset range, and if so, acquiring the effective value of the air to be measured in the preset time period as the dew point temperature; otherwise, the temperature fluctuation amplitude identification at the later moment of the regulation and control ending moment is continuously executed until the dew point temperature is obtained.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, the practical application, or improvements made to the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A dew point temperature detecting device for a fuel cell, characterized by comprising:
the controllable electromagnetic valve is arranged at the front end of the optical temperature detection equipment and used for inputting air to be detected of the air stacking pipeline into the optical temperature detection equipment after being opened according to a detection instruction of a user;
the optical temperature detection equipment is used for detecting the temperature of air to be detected and the mirror surface temperature of the optical reflector in real time; comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be measured in the regulating and controlling process; and after the regulation is finished, acquiring the temperature fluctuation amplitude of the optical reflector surface within a preset time period from the regulation finishing time, identifying whether the temperature fluctuation amplitude is within a preset range, if so, acquiring the effective value of the air to be detected within the preset time period as the dew point temperature, otherwise, continuously executing the temperature fluctuation amplitude identification at the next time after the regulation finishing time until the dew point temperature is obtained.
2. The dew point temperature detecting device for a fuel cell according to claim 1, wherein the dew point temperature detecting device is located on a parallel branch of a fuel cell air stack pipe or directly connected in series to the fuel cell air stack pipe.
3. The dew point temperature detecting device for a fuel cell according to claim 1 or 2, wherein the number of the controllable electromagnetic valves is 2, and each of the controllable electromagnetic valves is respectively provided at the front and rear ends of the optical temperature detecting apparatus; and the number of the first and second electrodes,
and all the controllable electromagnetic valves are simultaneously opened according to the detection instruction of the user, and are simultaneously closed according to the closing instruction of the user after the detection is finished.
4. The dew point temperature detecting device for a fuel cell according to claim 3, wherein the optical temperature detecting means further comprises: the device comprises a ventilation pipeline, and a laser emitter, an optical reflector, a photoelectric sensor, a temperature sensor and controllable temperature-regulating and measuring equipment which are positioned in the ventilation pipeline; wherein the content of the first and second substances,
the laser emitter is arranged at the top of the ventilation pipeline; the optical reflector is arranged at a position which forms a preset angle with an incident light path, and the lower end of the optical reflector is connected with the inner wall of the ventilation pipeline; the photoelectric sensor is arranged in the direction of the reflection light path and is bonded with the inner wall of the ventilation pipeline; the temperature sensor is arranged on the surface of the optical reflector; and the output ends of the photoelectric sensor and the temperature sensor are respectively connected with the input end of the controllable temperature-regulating and measuring equipment.
5. The dew point temperature detecting apparatus for a fuel cell according to claim 4, wherein the temperature-controllable temperature-regulation temperature-measurement device further comprises:
an analysis and calculation unit for analyzing all the received electrical signals to obtain the temperature of the air to be measured and the temperature of the mirror surface of the optical reflector in real time, and comparing the two temperatures to obtain the temperature differenceTWill be describedTSending the data to a control unit;
a control unit for depending on the ΔTWhen the execution unit is startedTWhen the temperature is more than 0, the execution unit is started to heat the optical reflector continuously, the maximum temperature change in the preset time period from the heating moment of the air to be measured is obtained while heating, and whether the Δ of the temperature difference is eliminated is judged according to the maximum temperature changeTIf so, controlling the execution unit to stop heating and sending a starting instruction to the temperature calculation unit, otherwise, continuing to judge the next moment of the heating moment until the temperature difference is zero; when anTWhen the temperature of the optical reflector is less than 0, starting an execution unit for refrigeration to continuously reduce the temperature of the optical reflector, and simultaneously obtaining the maximum temperature change of the air to be detected within a preset time period from the refrigeration moment at regular time until the maximum temperature change exceeds a preset threshold value, controlling the execution unit to stop refrigeration and start heating, and controlling the execution unit to stop heating and sending a starting instruction to a temperature calculation unit when heating is continuously carried out until the temperature of the air to be detected is identified to recover to a corresponding calibration temperature after incident light is reflected by liquid water;
the execution unit is arranged on the mirror surface or the back surface of the optical reflector uniformly and used for continuously cooling or heating the optical reflector after being started;
the temperature calculation unit is used for acquiring temperature fluctuation amplitudes of the optical reflector surface at a plurality of moments in a preset time period from the regulation and control ending moment after starting, identifying whether each temperature fluctuation amplitude is in a preset range, and if so, acquiring an effective value of air to be detected in the preset time period as a dew point temperature; otherwise, continuing to identify at the subsequent moment of the current moment until each temperature fluctuation amplitude is within a preset range.
6. The dew point temperature detecting device for a fuel cell according to claim 5, wherein the execution unit includes 2 semiconductor cooling fins; wherein the content of the first and second substances,
the heating surface of one semiconductor refrigerating sheet is tightly attached to the mirror surface of the optical reflector and used for heating the optical reflector after being started; and the refrigerating surface of the other semiconductor heating sheet is tightly attached to the mirror surface of the optical reflector and used for cooling the optical reflector after starting.
7. The dew point temperature detecting device for a fuel cell according to claim 5 or 6, wherein the control unit executes the following program for temperature regulation:
get aTIs judged to beTWhether greater than 0;
if anTWhen the temperature difference is larger than 0, the execution unit is started to heat the optical reflector continuously, the maximum temperature change in the preset time period from the heating moment of the air to be measured is obtained at regular time while heating, and whether the temperature difference is eliminated is judged according to the maximum temperature changeTThe influence on the dew point temperature detection, if the maximum temperature change exceeds a preset threshold value, the temperature difference is judged to be eliminatedTControlling the execution unit to stop heating immediately and sending a starting instruction to the temperature calculation unit for the influence on the detection of the dew point temperature, otherwise, obtaining the maximum temperature change of the air to be detected in a preset time period from the next moment of the heating moment again, and executing the judgment of the next moment until the fact that the temperature difference is equal toTThe temperature regulation is finished due to the influence on the dew point temperature detection;
if anTWhen the temperature is less than 0 ℃, starting an execution unit to refrigerate to carry out temperature control on the optical reflectorContinuously cooling, namely, while refrigerating, regularly acquiring the maximum temperature change of the air to be measured within a preset time period from the refrigerating moment until the maximum temperature change exceeds a preset threshold value, and controlling an execution unit to stop refrigerating and start heating; the method comprises the steps that the real-time temperature of air to be measured is obtained regularly in the heating process, and when the real-time temperature of the air to be measured is recovered to a corresponding calibration temperature after incident light is reflected by liquid water, an execution unit is controlled to stop heating, and a starting instruction is sent to a temperature calculating unit;
if anTAnd =0, directly sending a starting instruction to the temperature calculating unit.
8. The dew point temperature detecting device for a fuel cell according to claim 7, wherein the temperature calculating unit executes the following routine to obtain the dew point temperature:
after starting, the starting time is sequentially acquirednObtaining the maximum value and the minimum value of the mirror surface temperature of the optical reflector in adjacent equal interval time periods to obtain the fluctuation range of the mirror surface temperature in each time period;
identifying whether the fluctuation range of the temperature of the mirror surface is within a preset range in each time period, if so, starting the mirror surface at the later momentnThe effective value of the air to be measured in adjacent equal interval time periods is used as the dew point temperature; otherwise, continuing to identify the next moment until continuing to identify the next momentnAnd obtaining the dew point temperature until each temperature fluctuation amplitude in the adjacent equal interval time periods is within a preset range.
9. The dew point temperature detecting device for a fuel cell according to claim 8, wherein the dew point temperature is set to be lower than a predetermined valueT dewObtained by the following formula
T dew=（T max+T min）/2
In the formula (I), the compound is shown in the specification,T maxto initially satisfynThe maximum temperature of the air to be measured with the surface temperature fluctuation range in the preset range in each adjacent equal interval time period;T minto initially satisfynAnd the lowest temperature of the air to be measured, wherein the fluctuation range of the temperature of the mirror surface is in a preset range in each adjacent equal interval time period.
10. A dew point temperature detection method for a fuel cell, characterized by comprising the steps of:
building a dew point temperature detection device for the fuel cell on a parallel branch or a series branch of an air stacking pipeline of the fuel cell; the dew point temperature detection device comprises a controllable electromagnetic valve and an optical temperature detection device which are connected in sequence;
opening a controllable electromagnetic valve, and inputting air to be detected of air entering a reactor pipeline into optical temperature detection equipment;
respectively detecting the temperature of air to be detected and the temperature of the mirror surface of an optical reflector in optical temperature detection equipment in real time, comparing the two temperatures, regulating and controlling the temperature of the optical reflector according to the obtained temperature difference, and judging whether to stop regulating and controlling according to the real-time temperature change of the air to be detected in the regulating and controlling process;
after the regulation is finished, acquiring the temperature fluctuation amplitude of the optical reflector surface within a preset time period from the regulation finishing time, identifying whether the temperature fluctuation amplitudes are all within a preset range, and if so, acquiring the effective value of the air to be measured within the preset time period as the dew point temperature; otherwise, the temperature fluctuation amplitude identification at the later moment of the regulation and control ending moment is continuously executed until the dew point temperature is obtained.
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| GB1297296A (en) * | 1969-12-18 | 1972-11-22 | ||
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| CN103245695A (en) * | 2013-04-25 | 2013-08-14 | 南京信息工程大学 | High-precision dew point measuring device and detection method based on same |
| CN109085201A (en) * | 2018-09-12 | 2018-12-25 | 南京信息工程大学 | A kind of ultra-low humidity dew point hygrometer and its temprature control method |
| CN112378956A (en) * | 2020-10-30 | 2021-02-19 | 上海交通大学 | Low-temperature gas humidity measuring system and method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1297296A (en) * | 1969-12-18 | 1972-11-22 | ||
| CN102636519A (en) * | 2011-02-12 | 2012-08-15 | 北京兴泰学成仪器有限公司 | Method and device for rapidly and accurately determining dew point of low-humidity gas |
| CN103245695A (en) * | 2013-04-25 | 2013-08-14 | 南京信息工程大学 | High-precision dew point measuring device and detection method based on same |
| CN109085201A (en) * | 2018-09-12 | 2018-12-25 | 南京信息工程大学 | A kind of ultra-low humidity dew point hygrometer and its temprature control method |
| CN112378956A (en) * | 2020-10-30 | 2021-02-19 | 上海交通大学 | Low-temperature gas humidity measuring system and method |
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