CN112557240A - Calibration device and method for flue gas humidity tester - Google Patents
Calibration device and method for flue gas humidity tester Download PDFInfo
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Abstract
The invention belongs to the technical field of flue gas humidity detection, and particularly relates to a calibration device and a calibration method for a flue gas humidity tester, wherein the calibration device comprises a gas generation system, a test box, a gravimetric moisture measurement system and a control system; the gas generation system comprises a moisture generation system, a first electromagnetic valve, a first mass flowmeter, a dry gas generation system, a second electromagnetic valve, a second mass flowmeter and a mixing bin; a humidity standard device, a first thermometer, a second heater and a radiating fin are arranged in the test box; the outer wall of the test box is provided with a test hole; the bottom of the test box is provided with a gas discharge hole; the gravimetric moisture measuring system is used for measuring the humidity in the test box; the control system is used for adjusting the temperature in the test box to a preset temperature, adjusting the humidity in the test box to a preset humidity, and calibrating the humidity standard device through the gravimetric method moisture measurement system. The calibration device can meet the calibration requirement of the high-temperature high-humidity flue gas humidity tester, and solves the problem of traceability of the calibration device of the flue gas humidity tester.
Description
Technical Field
The invention belongs to the technical field of flue gas humidity detection, and particularly relates to a flue gas humidity tester calibration device and method.
Background
Flue gas humidity refers to the ratio of the volume of water vapor in a volume of flue gas to the volume of flue gas under standard conditions. A continuous monitoring system (CEMS) for flue gas of a fixed pollution source is an important device for monitoring organized exhaust emission, the quantitative calculation of monitoring pollutant data of the CEMS is mainly based on the condition of dry flue gas, but the flue gas discharged by industry is not ideal dry flue gas and always contains certain humidity, so the flue gas humidity becomes a necessary measurement factor in monitoring the flue gas pollution source, and the measurement accuracy is directly related to the total pollutant emission amount, the concentration calculation and the efficiency evaluation of a flue gas purification system. The flue gas humidity tester is an important device for detecting the flue gas humidity in a high-temperature and high-humidity environment.
The measuring principle of the flue gas humidity tester mainly comprises a dry-wet ball method, a resistance-capacitance method, a laser method, a high-temperature infrared method, a weight method and the like, and the instrument mainly measures the volume percentage of water vapor in flue gas emission and is an important instrument for detecting the flue gas humidity. The humidity measurement range of a common flue gas humidity tester in the market is 0-40% Vol, and the temperature range is (20-180) DEG C. Present common humidity calibrating device, what mainly provided is the relative humidity parameter under the normal atmospheric temperature state, can't satisfy the calibration requirement of high temperature and high humidity flue gas humidity tester, and present temperature and humidity measuring device often adopts accurate humidity standard ware or humidity transducer as the main standard, these two kinds of standard wares need often calibrate the side can satisfy the requirement if be in under the environment of high temperature and high humidity for a long time, according to the cycle of tracing to the source in the examination/calibration rule, can't satisfy its requirement of tracing to the source.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a calibration device and a calibration method for a flue gas humidity tester, which can meet the calibration requirement of detecting a high-temperature high-humidity flue gas humidity tester and solve the problem of tracing of the calibration device for the flue gas humidity tester.
In order to solve the defects of the prior art, the technical scheme provided by the invention is as follows:
the invention provides a calibration device for a flue gas humidity tester, which comprises a gas generation system, a test box, a gravimetric moisture measurement system and a control system;
the gas generation system comprises a moisture generation system, a first electromagnetic valve, a first mass flow meter, a dry gas generation system, a second electromagnetic valve, a second mass flow meter and a mixing bin; an outlet of the moisture generation system is sequentially connected with a first electromagnetic valve, a first mass flow meter and an inlet of the mixing bin through a moisture pipeline; an outlet of the dry gas generation system is sequentially connected with a second electromagnetic valve, a second mass flow meter and an inlet of the mixing bin through a dry gas pipeline; an outlet of the mixing bin is sequentially connected with a third electromagnetic valve and an inlet of the test box through a mixing air pipe;
a humidity standard device, a first thermometer, a second heater and a radiating fin are arranged in the test box; the outer wall of the test box is provided with a test hole; the bottom of the test box is provided with a gas discharge hole; an outlet of the test box is sequentially connected with a fourth electromagnetic valve and an inlet of the gravimetric moisture measurement system through a sampling pipe;
the gravimetric moisture measurement system is used for measuring the humidity in the test box;
the control system is used for adjusting the temperature in the test box to a preset temperature, adjusting the humidity in the test box to a preset humidity and calibrating the humidity standard device through the gravimetric method moisture measurement system.
Preferably, the moisture generating system comprises a water tank and an ultrasonic atomizer;
the dry gas generation system comprises a gas cylinder, a pressure gauge and a pressure reducing valve.
Preferably, the gas generating system is further provided with a first heater;
an outlet of the moisture generation system is sequentially connected with a first electromagnetic valve, a first heater, a first mass flow meter and an inlet of the mixing bin through a moisture pipeline;
an outlet of the dry gas generation system is sequentially connected with a second electromagnetic valve, a first heater, a second mass flowmeter and an inlet of the mixing bin through a dry gas pipeline;
a first heating wire and a heat insulation material are arranged on the outer surface of the wet air pipeline between the first heater and the mixing bin;
a second heating wire and a heat insulation material are arranged on the outer surface of the dry gas pipeline between the first heater and the mixing bin;
and a third heating wire and a heat-insulating material are arranged on the outer surface of the mixed gas pipe.
Preferably, the mixing bin adopts a labyrinth structure;
the mixing bin is provided with a third heater and a third thermometer.
Preferably, the humidity standard device is a resistance-capacitance method humidity sensor, and the humidity measurement range is 0-40% Vol.
Preferably, a fan and a gas accelerator are further arranged in the test box;
the fan is positioned at the bottom of the test box;
the gas accelerators are two and are fixed on two opposite side surfaces in the test box.
Preferably, the sampling pipe is provided with a self-limiting heating device;
the temperature of the sampling tube is controlled to be 120-130 ℃.
Preferably, the gravimetric moisture measuring system comprises a condenser, a condenser pipe, a drying pipe, a vacuum pressure gauge, a second thermometer, a third flow meter and a second air pump;
the sampling pipe is sequentially connected with the condensing pipe, the drying pipe, the vacuum pressure gauge, the second thermometer, the third flowmeter and the second air pump;
the condenser is used for cooling the condensation pipe.
The invention also provides a calibration method of the flue gas humidity tester, which comprises the following steps,
the control system adjusts the first heater, the second heater, the third heater, the first heating wire, the second heating wire and the third heating wire to enable the temperatures of the mixing bin and the test box to reach the preset temperature input by a user;
opening the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve through the control system, and opening the ultrasonic atomizer and the pressure reducing valve to enable moisture and dry gas to enter the test box after being mixed in the mixing bin;
the control system adjusts the first electromagnetic valve, the second electromagnetic valve and the ultrasonic atomizer to enable the humidity measured by the humidity standard device in the test box to reach the preset humidity input by a user;
and placing a test gun of the tested flue gas humidity tester in the test hole, and calibrating the flue gas humidity tester according to the preset humidity.
Preferably, the method further comprises the step of calibrating the humidity standard by adopting a gravimetric method;
the calibration of the humidity standard by gravimetric method comprises,
weighing the initial total weight of the condensing pipe and the drying pipe;
installing a condensing pipe and a drying pipe;
opening a fourth electromagnetic valve and a second air pump through a control system, starting sampling by the gravimetric moisture measurement system, and recording a measurement value of the vacuum pressure gauge and a measurement value of a second thermometer by the control system;
after sampling is finished, the condensing tube and the drying tube are disassembled;
weighing the condensing pipe and the drying pipe to obtain the total weight increment of the condensing pipe and the drying pipe;
the control system calculates the humidity in the test box according to the total weight increment of the condensation pipe and the drying pipe, the measurement value of the vacuum pressure gauge and the measurement value of the second thermometer;
and the control system calibrates the humidity standard according to the calculated humidity in the test box.
The invention has the beneficial effects that:
1) the calibration requirement of a high-temperature (20-180) DEG C and high-humidity 0-40% Vol flue gas humidity tester can be met, and the defects of the prior art are overcome;
2) the gravimetric method moisture measurement system can realize the regular calibration of the humidity standard, improve the accuracy and reliability of the calibration device of the flue gas humidity tester, and solve the problem of source tracing of the calibration device of the flue gas humidity tester;
3) the invention adopts the mixing bin with a labyrinth structure, which can improve the uniformity of the mixed gas and the accuracy of the measuring result;
4) the invention adopts a whole-course heating mode, can ensure the stability of the temperature of the mixed gas in the test box, and is convenient for improving the accuracy of the calibration device of the flue gas humidity tester.
Drawings
FIG. 1 is a schematic structural diagram of a calibration device for a flue gas humidity tester provided by the invention;
FIG. 2 is a schematic diagram of a gravimetric moisture measurement system according to the present invention;
wherein, 1, a water tank; 2. an ultrasonic atomizer; 3. a first solenoid valve; 4. a second solenoid valve; 5. a gas cylinder; 6. a first pressure gauge; 7. a pressure reducing valve; 8. a first heater; 9. a first mass flow meter; 10. a second mass flow meter; 11. a mixing bin; 12. a third electromagnetic valve; 13. a test box; 14. a humidity standard; 15. a second heater; 16. a heat sink; 17. a test well; 18. a fan; 19. a fourth solenoid valve; 20. a gravimetric moisture measurement system; 21. a gas discharge hole; 22. a fifth solenoid valve; 23. a water pump; 24. a first air pump; 25. a constant temperature water tank; 26. a condenser pipe, 27, a drying pipe; 28; a vacuum pressure gauge; 29. a second thermometer; 30. a third flow meter; 31. a second air pump; 32. a condenser.
Detailed Description
The present invention will be further described with reference to the following embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.
The embodiment of the invention provides a calibration device for a flue gas humidity tester, which is shown in figure 1 and comprises a gas generation system, a test box 13, a gravimetric moisture measurement system 20 and a control system.
Referring to fig. 1, the gas generation system includes a wet gas generation system, a first solenoid valve 3, a dry gas generation system, a second solenoid valve 4, a first mass flow meter 9, a second mass flow meter 10, and a mixing bin 11; the outlet of the moisture generation system is sequentially connected with the inlets of the first electromagnetic valve 3, the first mass flow meter 9 and the mixing bin 11 through a moisture pipeline; an outlet of the dry gas generation system is sequentially connected with inlets of a second electromagnetic valve 4, a second mass flowmeter 10 and a mixing bin 11 through a dry gas pipeline; the outlet of the mixing bin 11 is connected with the third electromagnetic valve 12 and the inlet of the test box 13 in sequence through a mixing air pipe.
The first electromagnetic valve 3, the second electromagnetic valve 4, the first mass flow meter 9, the second mass flow meter 10 and the third electromagnetic valve 12 are all made of stainless steel.
Referring to fig. 1, a humidity standard 14, a first thermometer, a second heater 15 and a heat sink 16 are provided in the test box 13; the outer wall of the test box 13 is provided with a test hole 17; the bottom of the test box 13 is provided with a gas discharge hole 21; the outlet of the test box 13 is connected to the inlet of a fourth solenoid valve 19 and a gravimetric moisture measurement system 20 in that order via a sampling tube. The humidity standard 14 is used for detecting the humidity in the test box 13, the first thermometer is used for detecting the temperature in the test box 13, the second heater 15 is used for heating the test box 13 to make the temperature constant, and the cooling fin 16 is used for cooling the test box 13.
The material of the test box 13 and the fourth electromagnetic valve 19 is stainless steel.
Gravimetric moisture measurement system 20 is used to periodically calibrate humidity standard 14 within test chamber 13.
The control system is electrically connected with the first electromagnetic valve 3, the second electromagnetic valve 4, the first heater 8, the first mass flow meter 9, the second mass flow meter 10, the first heating wire, the second heating wire, the third heater, the third thermometer, the third electromagnetic valve 12, the second heater 15, the first thermometer, the humidity standard 14, the fifth electromagnetic valve 22, the water pump 23, the first air suction pump 24, the fourth electromagnetic valve 19, the condenser 26, the vacuum pressure gauge 28, the second thermometer 29, the third flow meter 30 and the second air suction pump 31.
The control system is used for adjusting the temperature in the test box 13 to a preset temperature, adjusting the humidity in the test box 13 to a preset humidity, and controlling the gravimetric moisture measurement system 20 to calibrate the humidity standard 14.
Preferably, referring to fig. 1, the moisture generation system includes a water tank 1 and an ultrasonic atomizer 2, and water in the water tank is changed into water vapor by the ultrasonic atomizer 2.
In another embodiment of the present invention, the moisture generating system includes a water tank and a third heater for converting water into water vapor by an evaporation principle.
Preferably, referring to fig. 1, the dry gas generation system comprises a gas cylinder 5, a first pressure gauge 6 and a pressure reducing valve 7 which are connected in sequence. The gas cylinder 5 is filled with high-purity nitrogen or clean air.
Preferably, referring to fig. 1, the gas generation system is further provided with a first heater 8; an outlet of the moisture generation system is sequentially connected with inlets of the first electromagnetic valve 3, the first heater 8, the first mass flow meter 9 and the mixing bin 11 through a moisture pipeline; the outlet of the dry gas generation system is sequentially connected with the inlets of the second electromagnetic valve 4, the first heater 8, the second mass flow meter 10 and the mixing bin 11 through a dry gas pipeline. The first heater 8 is made of stainless steel.
Preferably, a first heating wire and a heat insulation material are arranged on the outer surface of the wet air pipeline between the first heater 8 and the mixing bin 11; and a second heating wire and a heat-insulating material are arranged on the outer surface of the dry gas pipeline between the first heater 8 and the mixing bin 11. Through first heater heating first heater strip and second heater strip, the temperature when mist gets into mixing storehouse 11 can be guaranteed in first heater strip, second heater strip and insulation material's setting to increase the holistic temperature stability of flue gas humidity tester calibrating device.
Preferably, the outer surface of the mixed gas pipe is provided with a third heating wire and a heat-insulating material. Through first heater heating third heater strip, the temperature that the mist got into test box 13 can be guaranteed in third heater strip and insulation material's setting to increase the holistic temperature stability of flue gas humidity tester calibrating device.
Preferably, the mixing bin 11 adopts a labyrinth structure, and the labyrinth structure can increase the mixing path and the collision chance of the two gases, so as to ensure the sufficient mixing of the dry gas and the wet gas.
Preferably, mixing chamber 11 is equipped with third heater and third thermometer, guarantees that the gas mixture is in presetting temperature range in mixing chamber to increase the holistic temperature stability of flue gas humidity tester calibrating device. The material of mixing bin 11 is stainless steel, and the third thermometer adopts platinum resistance thermometer.
Preferably, the humidity standard 14 and the first thermometer are located on the top of the test chamber 14, and the second heater 15 and the heat sink 16 are located on the side wall of the test chamber 13; the test hole 17 is located in the middle of the front face of the test chamber 13.
Preferably, the first temperature is a platinum resistance thermometer.
The measuring hole 17 is used for inserting a testing gun of the tested smoke humidity tester. The size of the test hole 17 can be properly adjusted according to the size of the test gun of the tested smoke humidity tester. The number of the test holes 17 can be set to be a plurality according to the number of the tested smoke humidity testers.
Preferably, the measuring opening 17 is provided with a rubber sealing ring. The rubber sealing ring is made of polytetrafluoroethylene and is conical. When the test gun is used, the rubber sealing ring is sleeved on the tested gun, then the rubber sealing ring is inserted into the test hole, and the sealing performance is ensured by extruding through the conical structure. Rubber seals of different sizes may be provided to increase the sealing of the test chamber 13.
Preferably, the humidity standard 14 is a resistance-capacitance humidity sensor, and the humidity measurement range is 0-40% Vol.
Preferably, the test chamber 13 is further provided with two gas accelerators which are fixed to opposite sides inside the test chamber. The mixed gas entering the test box 13 is distributed more uniformly in the test box 13 under the action of the airflow accelerator.
Preferably, referring to fig. 1, a fan 18 is disposed at the bottom of the test box 13, and the fan 18 can accelerate the flow of the mixture in the test box 13.
Preferably, referring to fig. 1, the heat sink 16 is externally connected to a constant temperature water tank 25 through a water pump 23, and cools the test box 13 through water cooling.
Preferably, referring to fig. 1, the gas discharge hole 21 is connected to a fifth electromagnetic valve 22, a first suction pump 24 and a constant temperature water tank 25 in this order. The gas discharged through the gas discharge hole 21 is condensed by the constant temperature water tank 25 and discharged. The fifth solenoid valve 22 is made of stainless steel. The gas discharge hole 21 is normally closed. After the calibration is finished, the gas discharge hole 21 is opened, and the high-temperature gas is discharged after being cooled and condensed.
Preferably, the sampling pipe is provided with a self-limiting heating device, and the temperature of the sampling pipe is controlled to be 120-130 ℃. The self-limiting heating device is used for ensuring that the moisture in the mixed gas is in a gas state.
Referring to fig. 2, the gravimetric moisture measuring system 20 includes a condenser 32, a condenser tube 26, a drying tube 27, a vacuum pressure gauge 28, a second thermometer 29, a third flow meter 30, and a second suction pump 31; the sampling pipe is connected with a condensation pipe 26, a drying pipe 27, a vacuum pressure gauge 28, a second thermometer 29, a third flow meter 30 and a second air pump 31 in sequence.
The condenser 32 is used to cool the condensation duct 26.
Preferably, the condenser 32 is refrigerated by a compressor, and the temperature of the condensed mixed gas is ensured to be lower than 5 ℃.
Preferably, the condensation pipe 26 is a spiral condensation pipe to increase the condensation path of the mixture gas and improve the condensation efficiency.
Preferably, the drying pipe 27 is a U-shaped drying pipe, and phosphorus pentoxide is filled in the U-shaped drying pipe to further absorb moisture in the mixed gas.
In practical use, the condensation duct 26 and the drying duct 27 may be provided in plurality to improve detection efficiency.
The vacuum pressure gauge 28 is used to detect the pre-gauge pressure of the third flow meter 30.
Preferably, the gauge 28 is rated 1.0.
The second thermometer 29 is used to detect the pre-meter temperature of the third flow meter 30.
Preferably, the second thermometer 29 has a division value of 0.1 ℃.
The third flow meter 30 is used to control the gas flow rate. The gas flow rate is controlled within the range of 0-5L/min, preferably 1L/min.
Preferably, the third flow meter 30 is a volume flow meter, the measurement range of the third flow meter 30 is 0-5L/min, and the accuracy of the third flow meter 30 is not lower than 1.5% FS.
The air pump 31 is used to provide power for pumping air.
In practical use, an electronic balance is also required to weigh the condenser tube 26 and the drying tube 27. The division value of the electronic balance is 0.1 mg.
In the specific use process,
the control system heats up the mixed gas in the test box 13 by adjusting the first heater 8, the second heater 15, the third heater, the first heating wire, the second heating wire and the third heating wire, and cools down the mixed gas in the test box 13 by adjusting the water pump 23 so as to ensure that the temperature of the test box 13 meets the preset temperature.
In specific use, the control system mainly adjusts the first electromagnetic valve 3, the second electromagnetic valve 4 and the ultrasonic atomizer 2 according to the preset humidity and the numerical value of the humidity standard device 14 so as to ensure that the humidity environment of the test box 13 meets the set requirement.
Preferably, the control system is based on a central control machine and a PLC control system, and adopts PID control to complete the functions of instruction input, program control, data recording and the like of the whole flue gas humidity tester calibration device.
Preferably, the control system adopts Siemens PLC as a controller, and Labview software is applied to design an operation interface and write a control instruction program. The software operation interface is provided with parameter input windows such as preset temperature, preset humidity and atmospheric pressure and a detection data input window, so that original data recording, storage and export can be realized. The software operation interface also has an independent gravimetric moisture measurement system interface, and the interface has input windows of sampling flow, sampling time, sampling quality and the like, and has the functions of automatically calculating a humidity value, storing data, exporting data and the like.
Preferably, the software operation interface of the control system also has a standard humidity calibration function, and the requirements of single-point and linear calibration of the device are met.
The embodiment of the invention also provides a calibration method of the flue gas humidity tester, which comprises the following steps:
1) inputting a preset temperature and a preset humidity on a software interface of a control system;
2) the control system adjusts the first heater, the second heater, the third heater, the first heating wire, the second heating wire and the third heating wire to enable the temperatures of the mixing bin and the test box to reach the preset temperature input by a user;
3) the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are opened through the control system, the ultrasonic atomizer and the pressure reducing valve are opened, water is atomized to form moisture after passing through the ultrasonic atomizer, the moisture enters the mixing bin after being heated in the moisture pipeline, and meanwhile, dry gas enters the mixing bin after being heated in the dry gas pipeline;
4) adjust first solenoid valve, second solenoid valve and ultrasonic atomization ware through control system and make the humidity that humidity standard ware surveyed in the test box reach the preset humidity of user input:
if the humidity measured by the humidity standard device is lower than the preset humidity, the first electromagnetic valve is adjusted to be large, the flow of the humidity is increased, the atomization amount of the ultrasonic atomizer is increased, meanwhile, the second electromagnetic valve is adjusted to be small, the flow of the dry air is reduced, and therefore the humidity in the test box is increased;
if the humidity measured by the humidity standard device is higher than the set humidity, the first electromagnetic valve is turned down, the flow of the wet gas is reduced, the atomization amount of the ultrasonic atomizer is reduced, meanwhile, the second electromagnetic valve is turned up, the flow of the dry gas is increased, and the mixing volume ratio of the dry gas is improved, so that the humidity in the test box is reduced;
5) the testing gun of the tested flue gas humidity tester is arranged in the testing hole and fixed well, and after the data of the tested flue gas humidity tester is stable, the data is recorded, and the flue gas humidity tester is calibrated according to preset humidity.
6) And setting the next preset temperature and preset humidity on a software interface of the control system until the calibration of all the calibration points is completed.
Preferably, the calibration method of the flue gas humidity tester further comprises the step of calibrating the humidity standard by a gravimetric method:
1) weighing the initial total weight of the condenser tube and the drying tube:
preparing at least 3 groups of condensing tubes and drying tubes in advance, wherein the initial total weight is m11、m12、m13；
2) Installing a condensing pipe and a drying pipe at corresponding positions of a gravimetric moisture measurement system;
3) when the temperature and the humidity of the test box reach set conditions and are stable, selecting a gravimetric moisture measurement system interface on a software interface of a control system, setting sampling time and sampling flow, opening a fourth electromagnetic valve and a second air pump by the control system, starting sampling by the gravimetric moisture measurement system, and automatically recording a measurement value of a vacuum pressure gauge and a measurement value of a second thermometer by the control system;
4) after sampling is finished, the condensing tube and the drying tube are disassembled;
5) the condenser tube and the drying tube are weighed again, and the total weight is m respectively21、m22、m23Adding the total weight m21Minus the initial total weight m11The total weight increment of a condensing pipe and a drying pipe can be obtained, namely the total weight increment is the moisture content sampling mass m;
6) the control system calculates the humidity in the test box according to the total weight increment of the condensation pipe and the drying pipe, the measurement value of the vacuum pressure gauge and the measurement value of the second thermometer:
inputting the moisture content sampling mass m into a software interface of the control system, and simultaneously taking the recorded measurement values of the vacuum manometer and the second thermometer as the pre-measurement pressure P of the third flowmetertPre-metering gas temperature T with third flow metert；
The control system automatically calculates the humidity according to the formula (1), the other two groups of humidity values are obtained by adopting the same steps, and the average value of the three groups of data is taken as the basis for calibrating the humidity standard device;
in the formula:
x is humidity,%;
m is the sampling mass, g;
Vtfor measuring the volume of dry gas extracted in the state, Vt＝Qt×t，L；
QtIs the third flow meter reading, L/min;
t is sampling time, min; the setting of the sampling time is mainly based on the humidity, and the final sampling quality is ensured to be not lower than 1 mg;
Ttis the pre-meter gas temperature, deg.C, of the third flow meter;
Ptis the pre-metering pressure, Pa, of the third flow meter;
Baatmospheric pressure, Pa;
7) and the control system calibrates the humidity standard according to the calculated humidity in the test box.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A calibration device for a flue gas humidity tester is characterized by comprising a gas generation system, a test box, a gravimetric moisture measurement system and a control system;
the gas generation system comprises a moisture generation system, a first electromagnetic valve, a first mass flow meter, a dry gas generation system, a second electromagnetic valve, a second mass flow meter and a mixing bin; an outlet of the moisture generation system is sequentially connected with a first electromagnetic valve, a first mass flow meter and an inlet of the mixing bin through a moisture pipeline; an outlet of the dry gas generation system is sequentially connected with a second electromagnetic valve, a second mass flow meter and an inlet of the mixing bin through a dry gas pipeline; an outlet of the mixing bin is sequentially connected with a third electromagnetic valve and an inlet of the test box through a mixing air pipe;
a humidity standard device, a first thermometer, a second heater and a radiating fin are arranged in the test box; the outer wall of the test box is provided with a test hole; the bottom of the test box is provided with a gas discharge hole; an outlet of the test box is sequentially connected with a fourth electromagnetic valve and an inlet of the gravimetric moisture measurement system through a sampling pipe;
the gravimetric moisture measurement system is used for calibrating the humidity standard in the test box;
the control system is used for adjusting the temperature in the test box to a preset temperature, adjusting the humidity in the test box to a preset humidity and controlling the gravimetric method moisture measurement system to calibrate the humidity standard device.
2. The calibration device of the flue gas humidity tester of claim 1,
the moisture generation system comprises a water tank and an ultrasonic atomizer which are sequentially connected;
the dry gas generation system comprises a gas cylinder, a pressure gauge and a pressure reducing valve which are connected in sequence.
3. The calibration device of the flue gas humidity tester of claim 1,
the gas generation system is also provided with a first heater;
an outlet of the moisture generation system is sequentially connected with a first electromagnetic valve, a first heater, a first mass flow meter and an inlet of the mixing bin through a moisture pipeline;
an outlet of the dry gas generation system is sequentially connected with a second electromagnetic valve, a first heater, a second mass flowmeter and an inlet of the mixing bin through a dry gas pipeline;
a first heating wire and a heat insulation material are arranged on the outer surface of the wet air pipeline between the first heater and the mixing bin;
a second heating wire and a heat insulation material are arranged on the outer surface of the dry gas pipeline between the first heater and the mixing bin;
and a third heating wire and a heat-insulating material are arranged on the outer surface of the mixed gas pipe.
4. The calibration device of the flue gas humidity tester of claim 1,
the mixing bin adopts a labyrinth structure;
the mixing bin is provided with a third heater and a third thermometer.
5. The calibration device for the flue gas humidity tester as claimed in claim 1, wherein the humidity standard is a resistance-capacitance humidity sensor, and the humidity measurement range is 0-40% Vol.
6. The calibration device of the flue gas humidity tester of claim 1,
a fan and a gas accelerator are also arranged in the test box;
the fan is positioned at the bottom of the test box;
the gas accelerators are two and are fixed on two opposite side surfaces in the test box.
7. The calibration device of the flue gas humidity tester of claim 1,
the sampling pipe is provided with a self-limiting heating device;
the temperature of the sampling tube is controlled to be 120-130 ℃.
8. The flue gas humidity tester calibration device according to claim 1, wherein the gravimetric moisture measurement system comprises a condenser, a condenser pipe, a drying pipe, a vacuum pressure gauge, a second thermometer, a third flow meter and a second air pump;
the sampling pipe is sequentially connected with the condensing pipe, the drying pipe, the vacuum pressure gauge, the second thermometer, the third flowmeter and the second air pump;
the condenser is used for cooling the condensation pipe.
9. A calibration method for a flue gas humidity tester is characterized by comprising the following steps,
adjusting the first heater, the second heater, the third heater, the first heating wire, the second heating wire and the third heating wire according to any one of claims 1 to 8 to make the temperature of the mixing chamber and the test box reach the preset temperature input by a user;
opening the first solenoid valve, the second solenoid valve and the third solenoid valve of any one of claims 1 to 8, and opening the ultrasonic atomizer and the pressure reducing valve of any one of claims 1 to 8, so that the wet gas and the dry gas enter the test box after being mixed in the mixing bin;
adjusting the first solenoid valve, the second solenoid valve and the ultrasonic atomizer according to any one of claims 1 to 8 to make the humidity measured by the humidity standard device in the test box reach the preset humidity input by the user;
and placing a test gun of the tested flue gas humidity tester in the test hole, and calibrating the flue gas humidity tester according to the preset humidity.
10. The calibration method of the flue gas humidity tester according to claim 9, further comprising calibrating the humidity standard by a gravimetric method;
the calibration of the humidity standard by gravimetric method comprises,
weighing the initial total weight of the condensing pipe and the drying pipe;
installing a condensing pipe and a drying pipe;
opening a fourth electromagnetic valve and a second air pump through a control system, starting sampling by the gravimetric moisture measurement system, and recording a measurement value of the vacuum pressure gauge and a measurement value of a second thermometer by the control system;
after sampling is finished, the condensing tube and the drying tube are disassembled;
weighing the condensing pipe and the drying pipe to obtain the total weight increment of the condensing pipe and the drying pipe;
the control system calculates the humidity in the test box according to the total weight increment of the condensation pipe and the drying pipe, the measurement value of the vacuum pressure gauge and the measurement value of the second thermometer;
and the control system calibrates the humidity standard according to the calculated humidity in the test box.
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