Carbon dioxide measuring device using air as blank sample calibration
By designing a carbon dioxide measuring device calibrated with air blank samples, and using air to correct the CO2 sensor, combined with a desiccant layer and a hygrometer, the problem of CO2 measurement deviation in fermentation exhaust gas was solved, and the stability and accuracy of the sensor were improved, making it suitable for the bio-fermentation industry.
Patent Information
- Application Number
- CN202422964119.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-03
AI Technical Summary
In existing technologies, the measurement of CO2 in fermentation tail gas is biased and cannot be accurately measured, which leads to untimely adjustment of process parameters, resulting in reduced output and increased energy consumption.
Design a carbon dioxide measuring device that uses air as a blank sample for calibration. It has two air intake channels, one for fermentation exhaust gas and the other for air. The device is calibrated using the constant CO2 content in the air and combined with a desiccant layer and a hygrometer for accurate measurement.
It improves the measurement stability and long-term accuracy of CO2 sensors, solves the problem of CO2 measurement in the bio-fermentation industry, and meets the needs of multi-condition applications.
Smart Images
Figure CN223679147U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the fermentation field more specifically, relate to a carbon dioxide measuring device with air as blank sample calibration. BACKGROUND
[0002] In the fermentation industry, the analysis and measurement of fermentation tail gas have important significance. In the fermentation process, the change of tail gas composition can reflect the state of the fermentation process, and the concentration of carbon dioxide (CO2) is a key indicator. Through accurate measurement of the CO2 concentration in the fermentation tail gas, the operator can timely master the fermentation situation, and then adjust and optimize the process parameters.
[0003] At present, when measuring CO2 in the fermentation tail gas in the fermentation industry, the usual method is to first dry the gas in the tank with a drying agent, and then directly pass the treated gas into the measuring device where the CO2 sensor is located.
[0004] However, due to other gas components in the fermentation gas and the measurement drift of the CO2 sensor itself, the measurement value will deviate. Inaccurate measurement during the fermentation process cannot timely adjust the process parameters, resulting in reduced production and increased energy consumption. INVENTION CONTENTS
[0005] The utility model aims at solving the shortcomings in the prior art and proposes a carbon dioxide measuring device with air as blank sample calibration.
[0006] To solve the above problems, the utility model adopts the following technical scheme:
[0007] A carbon dioxide measuring device with air as blank sample calibration, comprising an outer casing, a CO2 sensor is provided on the outer casing, an air inlet and an air outlet are respectively provided at the bottom and top of the outer casing, an electromagnetic valve is installed at the air inlet, a first air inlet channel for sample air and a second air inlet channel for sample to be measured are connected to the electromagnetic valve.
[0008] As a further description of the above technical scheme: the CO2 sensor is sealingly fixed to the outer casing.
[0009] As a further description of the above technical scheme: a drying agent layer is provided at the sample inlet of the first air inlet channel and the second air inlet channel.
[0010] As a further description of the above technical scheme: a hygrometer is installed at the sample inlet of the second air inlet channel.
[0011] Compared with the prior art, the utility model has the advantages of:
[0012] The scheme can effectively improve the measurement stability and long-term accuracy of the CO2 sensor, can be applied to the biological fermentation industry, and solves the application problem of the CO2 measurement demand of the biological fermentation sensor industry, and provides a feasible scheme for the expansion of part of the industry technology. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a structural schematic view of the utility model.
[0014] Mark explanation in the drawing:
[0015] 1, outer casing; 2, CO2 sensor; 3, air inlet; 4, air outlet; 5, electromagnetic valve; 6, first air inlet channel; 7, second air inlet channel; 8, desiccant layer; 9, hygrometer. DETAILED DESCRIPTION
[0016] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.
[0017] Please refer to Figure 1 A carbon dioxide measuring device calibrated with air as a blank sample, comprising an outer casing 1, a CO2 sensor 2 is arranged on the outer casing 1, an air inlet 3 and an air outlet 4 are arranged at the bottom and top of the outer casing 1 respectively, an electromagnetic valve 5 is installed at the air inlet 3, and the electromagnetic valve 5 is connected with a first air inlet channel 6 for sampling air and a second air inlet channel 7 for sampling a to-be-measured sample. The CO2 sensor 2 is used for measuring the carbon dioxide content in the to-be-measured sample after dehumidification, and the electromagnetic valve 5 can control the air inlet amount of the first air inlet channel 6 and the second air inlet channel 7.
[0018] In the scheme, the electromagnetic valve 5 is added at the air inlet 3, so that the measuring device has two air inlet channels, one of which is connected with a measuring sample (fermentation tail gas), and the other of which is connected with air. Since the CO2 content in air is relatively constant, about 0.03%, and the CO2 content in fermentation tail gas ranges from about 3% to 15%. The significant content difference makes air relative to the measuring sample (fermentation tail gas) can be used as a standard sample for correction.
[0019] By introducing air as a blank sample into the measuring device periodically or under certain conditions, the measurement results of the CO2 sensor can be corrected using the known CO2 content of the air, thereby reducing the measurement deviation caused by sensor drift, and further ensuring long-term accurate measurement of the product and meeting the use requirements of more application conditions. It can be applied to the biological fermentation industry, thereby solving the application problem of CO2 measurement demand in the biological fermentation sensor industry, and providing a feasible scheme for the expansion of part of the industry technology.
[0020] The CO2 sensor 2 is sealed and fixed with the outer shell 1 to ensure the sealing of the device. The first gas inlet channel 6 and the second gas inlet channel 7 are both provided with a desiccant layer 8 at the sample inlet. The desiccant layer 8 is used to reduce the influence of the humidity of the sample entering the device on the measurement of carbon dioxide. A hygrometer 9 is installed at the sample inlet of the second gas inlet channel 7 to measure the humidity of the sample inlet, and to compensate for the accuracy of the carbon dioxide measurement.
[0021] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical range disclosed by the present application, according to the technical scheme and improvement concept of the present application, can make equivalent replacement or change, which should be covered within the protection scope of the present application.
Claims
1. A carbon dioxide measuring device calibrated with air as a blank sample, comprising an outer casing (1), wherein a CO2 sensor (2) is arranged on the outer casing (1), and an air inlet (3) and an air outlet (4) are arranged on the bottom and top of the outer casing (1) respectively, characterized in that: An electromagnetic valve (5) is installed at the air inlet (3), and a first air inlet channel (6) for sample air and a second air inlet channel (7) for sample to be tested are connected to the electromagnetic valve (5).
2. The carbon dioxide measuring device according to claim 1, wherein: The CO2 sensor (2) is sealed and fixed with the outer shell (1).
3. The carbon dioxide measuring device calibrated using air as a blank sample according to claim 1, characterized in that: A desiccant layer (8) is arranged at the sample inlet of the first air inlet channel (6) and the second air inlet channel (7).
4. The carbon dioxide measuring device according to claim 1, wherein: the air is used as a blank sample. A hygrometer (9) is installed at the sample inlet of the second air inlet channel (7).