Calibration device for a gas analyzer and gas analysis system

Abstract

The application discloses a kind of gas analyzer's calibration device and gas analysis system, calibration device includes several groups of calibration module, each calibration module includes controller, and three-way regulating valve equipment and calibration unit are connected with controller communication;Different calibration module is used to calibrate different categories of standard gas;Calibration unit, three-way regulating valve equipment and gas analyzer are sequentially communicated by pipeline;Controller is used to generate first control instruction when calibration, based on first control instruction control the valve opening of corresponding calibration unit;Controller is also used to generate second control instruction when calibration, based on second control instruction drive corresponding three-way regulating valve equipment switches to target working state, to make standard gas that calibration unit exports pass three-way regulating valve equipment and be delivered to corresponding gas analyzer, using standard gas to calibrate gas analyzer and carry out calibration operation.The device ensures the measurement accuracy of analyzer and the accuracy of test result.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to a calibration device for a gas analyzer and a gas analysis system. Background Technology

[0002] During airworthiness certification, aircraft engines must undergo gas emission analysis tests to verify whether their emissions performance meets ICAO (International Civil Aviation Organization) requirements. ICAO regulations stipulate the following requirements for the calibration and inspection of gas analyzers: Zero-point and range calibrations must be performed on the gas analyzer before testing; at the end of the test and during the test, the zero-point and range must be rechecked at intervals not exceeding one hour. If the change at any point exceeds ±2% of the full-scale value of the selected range, the gas analyzer must be restored to its specifications, and the test repeated. Furthermore, ICAO regulations require periodic (monthly) linearity and synergy checks on the gas analyzer. All of the above calibrations and checks require the introduction of standard gases of various concentrations into the gas analyzer.

[0003] The current standard practice is to install a two-position three-way valve for sample gas / standard gas at the inlet of each gas analyzer. This valve is switched during testing and calibration. During testing, sample gas enters the gas analyzer, and during calibration, standard gas enters. However, this conventional practice often affects the accuracy of the analyzer's measurement results. Specifically, during testing, when standard gas is introduced into the gas analyzer for calibration or testing, valve sealing issues may cause a small amount of sample gas from the combustion chamber outlet to also enter the analyzer, affecting the calibration or testing process and consequently the measurement results. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the calibration of gas analyzers in the prior art affects the accuracy of the gas analyzer measurement results, and to provide a calibration device for a gas analyzer and a gas analysis system.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This invention provides a calibration device for a gas analyzer, the calibration device comprising several sets of calibration modules, each calibration module comprising a controller, a three-way regulating valve device and a calibration unit communicatively connected to the controller; different calibration modules are used to calibrate different types of standard gases;

[0007] The calibration unit, the three-way regulating valve device, and the gas analyzer are connected in sequence via pipelines;

[0008] The controller is used to generate a first control command during calibration, and control the valve of the corresponding calibration unit to open based on the first control command;

[0009] The controller is also used to generate a second control command during calibration, and drive the corresponding three-way regulating valve device to switch to the target working state based on the second control command, so that the standard gas output by the calibration unit is delivered to the corresponding gas analyzer through the three-way regulating valve device, and the gas analyzer is calibrated using the standard gas.

[0010] Preferably, the calibration device includes: a switching valve;

[0011] The air outlet of the switching valve is connected to the air inlet of each of the three-way regulating valve devices via pipelines.

[0012] The switching valve is used to open the valve during gas testing to deliver the gas sample to the corresponding gas analyzer for testing;

[0013] And / or, the switching valve is also used to close the valve during calibration to stop the gas sample from being delivered to the corresponding gas analyzer.

[0014] Preferably, the three-way regulating valve device includes a first three-way pneumatic valve and a second three-way pneumatic valve;

[0015] The air outlet of the first three-way pneumatic valve and the air inlet of the second three-way pneumatic valve are connected by a pipeline;

[0016] The outlet of the second three-way pneumatic valve is connected to the corresponding gas analyzer via a pipeline.

[0017] Preferably, the calibration device further includes: a sampling rake, a first air pump, a third three-way pneumatic valve, a fourth three-way pneumatic valve, a pressure reducing valve, and a pressure sensor;

[0018] The third three-way pneumatic valve is connected to the switching valve and the pressure reducing valve through pipelines;

[0019] The first air pump is connected to the third three-way pneumatic valve and the fourth three-way pneumatic valve through pipelines;

[0020] The fourth three-way pneumatic valve is connected to the first three-way pneumatic valve via a pipeline;

[0021] The three-way pneumatic valve is electrically connected to the pressure sensor.

[0022] The sampling rake is used to sample the gas at the combustion chamber outlet;

[0023] The third three-way pneumatic valve is used to transport the gas sample to the corresponding gas analyzer in sequence through the pressure reducing valve, the fourth three-way pneumatic valve, the first three-way pneumatic valve, and the second three-way pneumatic valve when the pressure sensor measures that the gas pressure of the gas sample at the sampling rake outlet is greater than a first preset threshold.

[0024] The third three-way pneumatic valve is also used to deliver the gas sample sequentially through the first air pump, the fourth three-way pneumatic valve, the first three-way pneumatic valve, and the second three-way pneumatic valve to the corresponding gas analyzer when the pressure sensor measures that the gas pressure is less than or equal to the first preset threshold.

[0025] Preferably, the calibration device further includes: a safety valve;

[0026] The safety valve is connected to the pressure reducing valve and the fourth three-way pneumatic valve respectively through pipelines;

[0027] The safety valve is used to release the gas sample from the pipeline.

[0028] Preferably, the calibration device further includes a filter;

[0029] The filter is connected to the fourth three-way pneumatic valve and the first three-way pneumatic valve respectively through pipelines;

[0030] The filter is used to filter impurities in the gas sample.

[0031] Preferably, the calibration device further includes: a temperature sensor and a second air pump;

[0032] The second air pump is connected to the switching valve and the third three-way pneumatic valve via pipelines;

[0033] The temperature sensor is electrically connected to the second air pump.

[0034] The second pump is used to pump air from the pipeline when the temperature of the gas sample at the sampling rake outlet is less than a second preset threshold as measured by the temperature sensor.

[0035] Preferably, the calibration device further includes: a high-temperature cabinet and a normal-temperature cabinet;

[0036] Both the high-temperature cabinet and the normal-temperature cabinet are used to hold the components required for calibration, so that the temperature of the components can be stabilized at the set temperature.

[0037] Preferably, the calibration device further includes: a heater;

[0038] The heater is used to heat the high-temperature cabinet unit.

[0039] Preferably, the three-way regulating valve device includes a first three-way solenoid valve and a second three-way solenoid valve;

[0040] The air outlet of the first three-way solenoid valve and the air inlet of the second three-way solenoid valve are connected by a pipeline.

[0041] The outlet of the second three-way solenoid valve is connected to the corresponding gas analyzer via a pipeline.

[0042] Preferably, the calibration device further includes: a condenser;

[0043] The condenser is connected to the switching valve and the first three-way solenoid valve via pipelines.

[0044] Preferably, the calibration device includes three sets of the calibration modules.

[0045] The present invention also provides a gas analysis system, including a calibration device for a gas analyzer as described above.

[0046] The positive and progressive effects of this invention are as follows:

[0047] This invention provides a calibration device and a gas analysis system for a gas analyzer. The calibration device, through the inclusion of a three-way regulating valve, switches to the target operating state during calibration, allowing the standard gas output from the calibration unit to be delivered to the corresponding gas analyzer for calibration. This device provides dual-pass, dual-resistance functionality, meeting the calibration and inspection requirements of gas analysis test analyzers and preventing inaccurate calibration and inspection due to cross-contamination between sample gas and standard gas, thus ensuring the accuracy of the analyzer's measurements and test results. Furthermore, by incorporating several calibration modules, this device can simultaneously or individually calibrate gas analyzers for one or more gases, further meeting practical needs. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the calibration module in the calibration device of the gas analyzer according to Embodiment 1 of the present invention;

[0049] Figure 2 This is a schematic diagram of the gas analysis system according to Embodiment 1 of the present invention. Detailed Implementation

[0050] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0051] Example 1

[0052] like Figure 1 , Figure 2As shown, this embodiment discloses a calibration device for a gas analyzer. The calibration device includes several calibration modules. Each calibration module includes a controller 01, a three-way regulating valve device 02 and a calibration unit 03 that are communicatively connected to the controller. Different calibration modules are used to calibrate different types of standard gases.

[0053] The calibration unit 03, the three-way regulating valve device 02, and the gas analyzer are connected in sequence through pipelines;

[0054] The controller 01 is used to generate a first control command during calibration, and control the valve of the corresponding calibration unit 03 to open based on the first control command;

[0055] The controller 01 is also used to generate a second control command during calibration, and drive the corresponding three-way regulating valve device 02 to switch to the target working state based on the second control command, so that the standard gas output by the calibration unit 03 is delivered to the corresponding gas analyzer through the three-way regulating valve device 02, and the gas analyzer is calibrated using the standard gas.

[0056] The calibration device for the gas analyzer, through the inclusion of a three-way regulating valve 02, switches to the target operating state during calibration. This allows the standard gas output from the calibration unit 03 to be delivered to the corresponding gas analyzer for calibration. This device provides dual-pass, dual-resistance functionality, meeting the calibration and inspection requirements of the gas analysis test analyzer and preventing inaccuracies caused by cross-contamination between sample and standard gases, thus ensuring the accuracy of the analyzer's measurements and test results. Furthermore, by incorporating several calibration modules, this device can simultaneously or individually calibrate gas analyzers for one or more gases, further meeting practical needs.

[0057] In one feasible embodiment, the calibration device includes: a switching valve 2;

[0058] The outlet of the switching valve 2 is connected to the inlet of each of the three-way regulating valve devices 02 via pipelines.

[0059] The switching valve 2 is used to open the valve during gas testing to deliver the gas sample to the corresponding gas analyzer for testing;

[0060] And / or, the switching valve 2 is also used to close the valve during calibration to stop the gas sample from being delivered to the corresponding gas analyzer.

[0061] In one implementable embodiment, the three-way regulating valve device includes a first three-way pneumatic valve 9 and a second three-way pneumatic valve 10;

[0062] The air outlet of the first three-way pneumatic valve 9 and the air inlet of the second three-way pneumatic valve 10 are connected by a pipeline.

[0063] The outlet of the second three-way pneumatic valve 10 is connected to the corresponding gas analyzer through a pipeline.

[0064] This solution, by setting two three-way pneumatic valves in the three-way regulating valve device 02, not only effectively ensures that no gas sample or other gas enters the analyzer during analyzer calibration and inspection, but also effectively controls the cost of the gas analyzer calibration device.

[0065] In one specific embodiment, the calibration device includes: a switching valve 2, a first three-way pneumatic valve 9, a second three-way pneumatic valve 10, a first gas analyzer 17, and a first calibration unit 26;

[0066] The first three-way pneumatic valve 9 is connected to the second three-way pneumatic valve 10 and the switching valve 2 through pipelines;

[0067] The second three-way pneumatic valve 10 is connected to the first gas analyzer 17 and the first calibration unit 26 via pipelines;

[0068] Both the first three-way pneumatic valve 9 and the second three-way pneumatic valve 10 are used to deliver the standard gas from the first calibration unit 26 to the first gas analyzer 17 during calibration to calibrate the first gas analyzer 17.

[0069] Among them, the switching valve 2 can be a two-way switching valve 2. The first three-way pneumatic valve 9 and the second three-way pneumatic valve 10 can be two-position three-way pneumatic valves. A two-position three-way pneumatic valve is a directional valve used in pneumatic facilities, with two position states and three ports. There are many types, which can be divided into electrically controlled valves, pneumatically controlled valves, mechanically controlled valves, manually controlled valves, foot valves, etc., according to the control method. The principle is that different ports are connected when the working position is different. The two-position three-way pneumatic valve can more accurately and flexibly control the gas flow direction in the pipeline.

[0070] The first gas analyzer 17 can be a UHC (Unburnt Hydrocarbon) analyzer, and the corresponding first calibration unit 26 can be a UHC calibration unit. The UHC analyzer is used to measure the volume concentration of UHC in the gas sample, and is ultimately used to calculate performance parameters such as pollution emission index, combustion efficiency, and gas temperature. The UHC calibration unit includes various standard gas-related gas cylinders, pressure reducing valves, switching valves, pressure sensors, etc., required for UHC analyzer zero-point calibration, range calibration, linearity check, and synergistic effect check.

[0071] Figure 2The gas flow direction is indicated in the diagram. For a two-position three-way UHC analyzer, unburned hydrocarbons can be analyzed. The UHC calibration unit is used to calibrate unburned hydrocarbons. The "sample gas" indicator on the actuated valve represents the sample gas from the combustion chamber outlet flowing into the first analyzer during testing. The first analyzer can be a UHC analyzer. The "standard gas" indicator represents the standard gas from the UHC calibration unit entering the UHC analyzer for calibration or testing. During UHC analyzer calibration or testing, the combustion chamber outlet gas will no longer enter the UHC analyzer. Simultaneously, the sample gas in the pipeline between the two-position three-way actuated valve and the two-position three-way actuated valve will be discharged from the two-position three-way actuated valve. This ensures that no sample gas enters the UHC analyzer; only standard gas enters, guaranteeing the accuracy of UHC analyzer calibration, testing, and measurement.

[0072] In one feasible embodiment, the calibration device further includes: a sampling rake 1, a first air pump 5, a third three-way pneumatic valve 3, a fourth three-way pneumatic valve 7, a pressure reducing valve 4, and a pressure sensor 21;

[0073] The third three-way pneumatic valve 3 is connected to the switching valve 2 and the pressure reducing valve 4 respectively through pipelines;

[0074] The first air pump is connected to the third three-way pneumatic valve 3 and the fourth three-way pneumatic valve 7 via pipelines;

[0075] The fourth three-way pneumatic valve 7 is connected to the first three-way pneumatic valve 9 via a pipeline;

[0076] The three-way pneumatic valve is electrically connected to the pressure sensor 21;

[0077] The sampling rake 1 is used to sample the gas at the combustion chamber outlet;

[0078] The third three-way pneumatic valve 3 is used to transport the gas sample to the first gas analyzer 17 in sequence through the pressure reducing valve 4, the fourth three-way pneumatic valve 7, the first three-way pneumatic valve 9, and the second three-way pneumatic valve 10 when the pressure sensor 21 measures that the gas pressure of the gas sample at the outlet of the sampling rake 1 is greater than the first preset threshold.

[0079] The third three-way pneumatic valve 3 is also used to transport the gas sample sequentially through the first air pump 5, the fourth three-way pneumatic valve 7, the first three-way pneumatic valve 9, and the second three-way pneumatic valve 10 to the first gas analyzer 17 when the pressure sensor 21 measures a gas pressure less than or equal to a first preset threshold.

[0080] The third three-way pneumatic valve 3 and the fourth three-way pneumatic valve 7 can be two-position three-way pneumatic valves. The third three-way pneumatic valve 3 and the fourth three-way pneumatic valve 7 are used to control the flow direction of the sample gas. When the sample gas pressure at the outlet of the sampling rake 1 measured by the pressure sensor 21 is higher than 0.25 MPa, the sample gas flows through the pressure reducing valve 4; when the sample gas pressure at the outlet of the sampling rake 1 is lower than 0.25 MPa, the sample gas flows through the first suction pump. Figure 2 The diagram indicates the flow direction of the two-position three-way pneumatic valve. "High pressure" indicates the path through which the sample gas flows via the pressure reducing valve 4, and "low pressure" indicates the path through which the sample gas flows via the first suction pump. The pressure reducing valve 4 is used to reduce the sample gas pressure when it is high, to meet the pressure requirements of the analyzer. The first suction pump is used to evacuate the sample gas when the pressure is low, to meet the pressure and flow rate requirements of the analyzer.

[0081] This scheme, by setting up a first suction pump 5, a third three-way pneumatic valve 3, a fourth three-way pneumatic valve 7, a pressure reducing valve 4, and a pressure sensor 21, allows the gas sample to be depressurized or pressurized according to the gas pressure of the gas sample at the outlet of the sampling rake 1, thereby meeting the pressure and flow requirements of the analyzer for the sample gas and ensuring the accuracy of the gas analyzer's measurement results.

[0082] In one feasible embodiment, the calibration device further includes: a safety valve 16;

[0083] The safety valve 16 is connected to the pressure reducing valve 4 and the fourth three-way pneumatic valve 7 respectively through pipelines;

[0084] The safety valve 16 is used to release a sample of gas in the pipeline to reduce the pressure in the pipeline.

[0085] In this solution, safety valve 16 will automatically activate and release pressure when pressure reducing valve 4 is damaged, thus preventing high-pressure sample gas from damaging the downstream analyzer.

[0086] In one implementable embodiment, the calibration device further includes: a filter 8;

[0087] The filter 8 is connected to the fourth three-way pneumatic valve 7 and the first three-way pneumatic valve 9 respectively through pipelines;

[0088] The filter 8 is used to filter impurities in the gas sample.

[0089] In this design, filter 8 is used to filter impurities in the sample gas to meet the cleanliness requirements of the analyzer, thereby ensuring the accuracy of the gas analyzer's measurement results.

[0090] In one feasible embodiment, the calibration device further includes: a temperature sensor 20 and a second air pump 6;

[0091] The second air pump 6 is connected to the switching valve 2 and the third three-way pneumatic valve 3 through pipelines;

[0092] The temperature sensor 20 is electrically connected to the second air pump 6;

[0093] The second pump 6 is used to pump air from the pipeline when the temperature of the gas sample at the outlet of the sampling rake 1 is less than a second preset threshold as measured by the temperature sensor 20.

[0094] In this scheme, the second suction pump 6 is used to pump air when the temperature of the sample gas at the outlet of the sampling rake 1 measured by the temperature sensor 20 is less than the second preset threshold, such as 145°C, so that more sample gas flows through the sampling rake 1, thereby increasing the temperature of the sample gas at the outlet of the sampling rake 1 and preventing some components in the gas from condensing and affecting the measurement results.

[0095] In one feasible embodiment, the calibration device further includes: a high-temperature cabinet 23 and a normal-temperature cabinet 24;

[0096] Both the high-temperature cabinet 23 and the normal-temperature cabinet 24 are used to hold the components required for measurement.

[0097] In this solution, the high-temperature cabinet is used to house the pipes, valves and other components required for UHC and NOx measurements, while the ambient temperature cabinet is used to house the pipes, valves and other components required for CO and CO2 measurements.

[0098] In one feasible embodiment, the calibration device further includes: a heater 25;

[0099] The heater 25 is used to heat the cabinet unit.

[0100] The electric heater 25 is used to heat the high-temperature cabinet so that the temperature of the high-temperature cabinet 23 can meet the temperature requirements of the components, ensuring the performance of the components and thus ensuring the accuracy of the gas analyzer measurement results.

[0101] In one feasible embodiment, the calibration device further includes: a fifth three-way pneumatic valve 11, a sixth three-way pneumatic valve 12, a second gas analyzer 18, and a second calibration unit 27;

[0102] The fifth three-way pneumatic valve 11 is connected to the switching valve 2 and the sixth three-way pneumatic valve 12 respectively through pipelines;

[0103] The sixth three-way pneumatic valve 12 is connected to the second gas analyzer 18 and the second calibration unit 27 respectively through pipelines;

[0104] Both the fifth three-way pneumatic valve 11 and the sixth three-way pneumatic valve 12 are used to deliver the standard gas from the second calibration unit 27 to the second gas analyzer 18 during calibration to calibrate the second gas analyzer 18.

[0105] In this design, the fifth three-way pneumatic valve 11 and the sixth three-way pneumatic valve 12 can be two-position three-way pneumatic valves. The second gas analyzer 18 can be a NOx (nitrogen oxides) analyzer, and the corresponding second calibration unit 27 can be a NOx calibration unit. The NOx analyzer is used to measure the volume concentration of NOx, CO, and CO2 in the gas sample, and is ultimately used to calculate performance parameters such as pollution emission index, combustion efficiency, and gas temperature. The NOx calibration unit includes various standard gas-related gas cylinders, pressure reducing valves, switching valves, pressure sensors, etc., required for NOx analyzer zero-point calibration, range calibration, and linearity checks.

[0106] In one feasible manner,

[0107] The three-way regulating valve device includes a first three-way solenoid valve 14 and a second three-way solenoid valve 15.

[0108] The air outlet of the first three-way solenoid valve 14 and the air inlet of the second three-way solenoid valve 15 are connected by a pipeline.

[0109] The outlet of the second three-way solenoid valve 15 is connected to the corresponding gas analyzer through a pipeline.

[0110] In one specific embodiment, the calibration device includes:

[0111] The first three-way solenoid valve 14, the second three-way solenoid valve 15, the third gas analyzer 19, and the third calibration unit 28;

[0112] The first three-way solenoid valve 14 is connected to the second three-way solenoid valve 15 and the switching valve 2 through pipelines;

[0113] The second three-way solenoid valve 15 is connected to the third gas analyzer 19 and the third calibration unit 28 via pipelines.

[0114] The first three-way solenoid valve 14 and the second three-way solenoid valve 15 are both used to deliver the standard gas of the third calibration unit 28 to the third gas analyzer 19 during calibration to calibrate the third gas analyzer 19.

[0115] In this design, the first three-way solenoid valve 14 and the second three-way solenoid valve 15 can be two-position three-way solenoid valves. The third gas analyzer 19 can be a CO / CO2 (carbon monoxide / carbon dioxide) analyzer, and the corresponding third calibration unit 28 can be a CO / CO2 calibration unit. The CO / CO2 analyzer can measure the volume concentration of CO or CO2 in the sample gas, and is ultimately used to calculate performance parameters such as pollution emission index, combustion efficiency, and gas temperature. The CO / CO2 calibration unit includes various standard gas-related gas cylinders, pressure reducing valves, switching valves, pressure sensors, etc., required for zero-point calibration, range calibration, and linearity checking of the CO / CO2 analyzer.

[0116] In one feasible embodiment, the calibration device further includes: a condenser 13;

[0117] The condenser 13 is connected to the switching valve 2 and the first three-way solenoid valve 14 via pipelines.

[0118] In this scheme, the condenser 13 is used to condense the sample gas to meet the dryness requirements of the third gas analyzer 19. For example, when the third gas analyzer 19 is a CO / CO2 analyzer, the condenser 13 is used to meet the dryness requirements of the CO / CO2 sample gas of the CO / CO2 analyzer, thereby ensuring the accuracy of the gas analyzer measurement results.

[0119] To facilitate a better understanding of the present invention, the specific operation of the calibration device for the gas analyzer is further described below. The calibration of a UHC analyzer, NOx analyzer, and CO / CO2 analyzer will be used as examples for illustration.

[0120] In the experiment, the calibration procedures for the UHC analyzer, NOx analyzer, and CO / CO2 analyzer were as follows: First, close switch valve 2, then change the flow direction of the three-way pneumatic valve and the two-position three-way solenoid valve to make them... Figure 2 The flow direction of the "standard gas" is shown; then, open the relevant valves in the UHC calibration unit to allow the corresponding standard gas (standard gas with a concentration of approximately 0%, 30%, 60%, and 90% of the full scale, etc.) to flow into the UHC analyzer. Next, perform the UHC calibration or check; after the UHC analyzer is calibrated or checked, perform the calibration or check of the NOx analyzer and CO / CO2 analyzer respectively according to the above method.

[0121] In this scheme, the concentration of the corresponding standard gas is not limited to the standard gas at 0%, 30%, 60% and 90% of the full scale. The appropriate concentration can be selected for calibration according to actual needs.

[0122] Example 2

[0123] like Figure 2As shown, this embodiment discloses a gas analysis system, which includes a calibration device for a gas analyzer.

[0124] In this scheme, the calibration device for the gas analyzer can be the same as the calibration device for the gas analyzer in Example 1.

[0125] To facilitate a better understanding of the present invention, the specific operation of the gas analysis system is further described below. The following description uses an example of a gas analysis system including a UHC analyzer, a NOx analyzer, and a CO / CO2 analyzer.

[0126] First, the switch valve 2 is opened. Based on the sample gas pressure at the outlet of the sampling rake 1 measured by the pressure sensor 21, the flow path is selected to either the pressure reducing valve 4 or the first suction pump. That is, the sample gas from the outlet of the sampling rake 1 flows through a 160℃ electrically heated insulation pipe into the high-temperature cabinet. Inside the high-temperature cabinet, the sample gas flows through the switch valve 2, the third three-way pneumatic valve 3, and the fourth three-way pneumatic valve 7. If the sample gas pressure is higher than 0.25MPa, the sample gas flows through the pressure reducing valve 4; otherwise, it flows through the first suction pump. Then, after passing through the filter 8, the sample gas is divided into three branches: one branch allows the sample gas to pass through the first three-way pneumatic valve 9 and the second three-way pneumatic valve 10, and then through the 160℃ electrically heated insulation pipe into the UHC analyzer. For the first three-way pneumatic valve 9 and the second three-way pneumatic valve 10, the sample gas flows along... Figure 2 The sample gas flows in the direction shown; another branch is where the sample gas passes through the fifth three-way pneumatic valve 11 and the sixth three-way pneumatic valve 12, and then enters the NOx analyzer through a 65℃ electrically heated insulation pipe. For the two-position three-way pneumatic valve, the sample gas flows along... Figure 2 The sample gas flows in the direction shown in the diagram; the third branch is where the sample gas enters the CO / CO2 analyzer after passing through the condenser 13 and the two-position three-way solenoid valve. For the first three-way solenoid valve 14 and the second three-way solenoid valve 15, the sample gas flows along... Figure 2 The "sample gas" flows in the direction shown.

[0127] This embodiment discloses a gas analysis system, which includes a calibration device for the gas analyzer described in the previous embodiment. By incorporating a three-way regulating valve, the system switches to the target operating state during calibration, allowing the standard gas output from the calibration unit to be delivered to the corresponding gas analyzer for calibration. This device provides dual-pass, dual-resistance functionality, meeting the calibration and inspection requirements of the gas analysis test analyzer and preventing inaccurate calibration and inspection due to cross-contamination between sample gas and standard gas, thus ensuring the accuracy of the analyzer's measurements and test results. Furthermore, by setting up several calibration modules, this calibration device can simultaneously or individually calibrate one or more gas analyzers, further meeting practical needs.

[0128] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A calibration device for a gas analyzer, characterized in that, The calibration device includes several sets of calibration modules, each calibration module including a controller, a three-way regulating valve device and a calibration unit communicatively connected to the controller; different calibration modules are used to calibrate different types of standard gases; The calibration unit, the three-way regulating valve device, and the gas analyzer are connected in sequence via pipelines; The controller is used to generate a first control command during calibration, and control the valve of the corresponding calibration unit to open based on the first control command; The controller is also used to generate a second control command during calibration, and drive the corresponding three-way regulating valve device to switch to the target working state based on the second control command, so that the standard gas output by the calibration unit is delivered to the corresponding gas analyzer through the three-way regulating valve device, and the standard gas is used to perform calibration operation on the gas analyzer. The calibration device includes: a switching valve; The air outlet of the switching valve is connected to the air inlet of each of the three-way regulating valve devices via pipelines. The switching valve is used to open the valve during gas testing to deliver the gas sample to the corresponding gas analyzer for testing; And / or, the switching valve is also used to close the valve during calibration to stop the gas sample from being delivered to the corresponding gas analyzer.

2. The calibration device for the gas analyzer as described in claim 1, characterized in that, The three-way regulating valve device includes a first three-way pneumatic valve and a second three-way pneumatic valve; The air outlet of the first three-way pneumatic valve and the air inlet of the second three-way pneumatic valve are connected by a pipeline; The outlet of the second three-way pneumatic valve is connected to the corresponding gas analyzer via a pipeline.

3. The calibration device for the gas analyzer as described in claim 2, characterized in that, The calibration device also includes: a sampling rake, a first air pump, a third three-way pneumatic valve, a fourth three-way pneumatic valve, a pressure reducing valve, and a pressure sensor; The third three-way pneumatic valve is connected to the switching valve and the pressure reducing valve through pipelines; The first air pump is connected to the third three-way pneumatic valve and the fourth three-way pneumatic valve through pipelines; The fourth three-way pneumatic valve is connected to the first three-way pneumatic valve via a pipeline; The third three-way pneumatic valve is electrically connected to the pressure sensor; The sampling rake is used to sample the gas at the combustion chamber outlet; The third three-way pneumatic valve is used to transport the gas sample to the corresponding gas analyzer in sequence through the pressure reducing valve, the fourth three-way pneumatic valve, the first three-way pneumatic valve, and the second three-way pneumatic valve when the pressure sensor measures that the gas pressure of the gas sample at the sampling rake outlet is greater than a first preset threshold. The third three-way pneumatic valve is also used to deliver the gas sample sequentially through the first air pump, the fourth three-way pneumatic valve, the first three-way pneumatic valve, and the second three-way pneumatic valve to the corresponding gas analyzer when the pressure sensor measures that the gas pressure is less than or equal to the first preset threshold.

4. The calibration device for the gas analyzer as described in claim 3, characterized in that, The calibration device also includes: a safety valve; The safety valve is connected to the pressure reducing valve and the fourth three-way pneumatic valve respectively through pipelines; The safety valve is used to release the gas sample from the pipeline.

5. The calibration device for the gas analyzer as described in claim 4, characterized in that, The calibration device further includes: a filter; The filter is connected to the fourth three-way pneumatic valve and the first three-way pneumatic valve respectively through pipelines; The filter is used to filter impurities in the gas sample.

6. The calibration device for the gas analyzer as described in claim 4, characterized in that, The calibration device also includes: a temperature sensor and a second air pump; The second air pump is connected to the switching valve and the third three-way pneumatic valve via pipelines; The temperature sensor is electrically connected to the second air pump. The second pump is used to pump air from the pipeline when the temperature of the gas sample at the sampling rake outlet is less than a second preset threshold as measured by the temperature sensor.

7. The calibration device for the gas analyzer as described in claim 1, characterized in that, The calibration device also includes: a high-temperature cabinet unit and a normal-temperature cabinet unit; Both the high-temperature cabinet and the normal-temperature cabinet are used to hold the components required for calibration, so that the temperature of the components can be stabilized at the set temperature.

8. The calibration device for the gas analyzer as described in claim 7, characterized in that, The calibration device further includes: a heater; The heater is used to heat the high-temperature cabinet unit.

9. The calibration device for the gas analyzer as described in claim 1, characterized in that, The three-way regulating valve device includes a first three-way solenoid valve and a second three-way solenoid valve. The air outlet of the first three-way solenoid valve and the air inlet of the second three-way solenoid valve are connected by a pipeline. The outlet of the second three-way solenoid valve is connected to the corresponding gas analyzer via a pipeline.

10. The calibration device for the gas analyzer as described in claim 9, characterized in that, The calibration device further includes: a condenser; The condenser is connected to the switching valve and the first three-way solenoid valve via pipelines.

11. The calibration device for the gas analyzer as described in any one of claims 1-10, characterized in that, The calibration device includes three sets of calibration modules.

12. A gas analysis system, characterized in that, The calibration device for the gas analyzer as described in any one of claims 1-11.

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