With the vigorous development of my country's biogas industry, intelligent products, convenient use, and technological testing have become the development trend of household biogas and supporting products. In order to facilitate the diagnosis of the problems encountered in the start-up, maintenance and repair of biogas digesters, here we introduce some common problems and solutions in the use and maintenance of Portable Biogas Analyzer, hoping to help you better grasp and use them.
Use and maintenance method:
In order to ensure the accuracy of the test data, the portable analyzer should be placed lightly to avoid impact. After arriving at the scene, it should be left to stand for a few minutes before starting the test, and the analyzer should be kept stable during the test. Press the power button to turn on the machine and preheat for 3~5 minutes. Since there is very little methane in the air, press the zero button and use air as a standard sample to calibrate the biogas analyzer.
When the amount of biogas to be detected is small or the air pressure is low, turn on the micro-pump that comes with the detector for suction to ensure sufficient and uniform air intake to make the detection data more accurate. When the amount of biogas is sufficient and the air pressure is high, it can be directly detected without micro-pump suction. The average value of three readings for the same biogas sample was taken as the final test result. After the test is completed, turn off the detector in time. A standard gas of 60:40 CH4:CO2, which is the closest to the composition of biogas, can be configured to calibrate the instrument and calculate the correction coefficient.
In order to prolong the service life of the instrument and ensure the accuracy of the instrument, the detected biogas must be desulfurized to avoid corrosion of instruments and equipment caused by H2S gas. At the same time, it is recommended to turn on the silica gel dryer (some instruments come with it) again to fully absorb the moisture brought by the biogas to avoid instrument corrosion and data offset. When the silica gel desiccant turns from blue to pink after absorbing water, heat and dry it and put it back into the desiccator for use.
Common problems and countermeasures:
1. The methane content of the same gas varies greatly when detecting the gas produced by the new pool
Reason: The equipment is not in a stable state; the air in the pipeline is not exhausted; the gas is not replaced during the measurement.
Countermeasures: The analyzer should stand still for 3 to 5 minutes after starting up, and it is best to place it flat during the test to avoid instrument deviation caused by vibration; the air content in the new pool is high, and the air in the biogas pipeline should be emptied before testing; The ear wash ball sucks air, fully flushes and replaces the gas in the analyzer to ensure the accuracy of the measurement.
2. The gas inlet and outlet of the analyzer are corroded
Reason: Hydrogen sulfide gas in biogas is highly corrosive in the presence of water vapor, and must be desulfurized and dehydrated.
Countermeasures: When desulfurization conditions are not available, the biogas can be pretreated with quicklime for detection, and it can also play a role in desulfurization, but be careful not to be burned by lime; the air inlet of the analyzer is connected to the silica gel dryer for dehydration treatment. After the particles change color, they can be reused after heating at high temperatures.