The necessity of high temperature oxygen analyzer-OXY-Flex for oxygen concentration detection in high temperature furnace
In the detection and control of oxygen content in industrial production engineering, the correct analysis of oxygen content not only requires understanding the measurement principles, technical characteristics, and corresponding limitations of various oxygen content analysis instruments, but also the necessary pretreatment of the process medium Today, the editor of Gongji.com introduces you to the necessity of oxygen concentration detection in high-temperature furnaces with the high-temperature oxygen analyzer-OXY-Flex.
During the working process of the high-temperature furnace, the furnace charge fully absorbs the waste heat of the flue gas in the shaft furnace, reduces the top exhaust temperature, and greatly improves the thermal efficiency. When the charge enters the bottom furnace, it has been preheated to close to the molten state, ensuring a high Melting rate and very low energy consumption, although the furnace door structure is reasonably sealed, there is no need to add a furnace at the furnace door; the furnace door is tightly sealed, the opening time is short, the heat loss in the furnace is small, there is no dead corner of slagging refining, easy operation, and good operating environment. However, load fluctuations often occur during work. At this time, the amount of combustion-supporting air must be adjusted to follow the fluctuation of the fuel amount. Otherwise, either the exhaust smoke will contain combustible gas, or the exhaust smoke will contain a lot of air. In short, if the amount of combustion air is not adjusted in time, the thermal efficiency of the heating furnace will drop sharply. The aluminum melting furnace that has been used for a period of time must adjust the amount of combustion air by detecting the oxygen content in the flue gas.
Therefore, the detection of oxygen concentration in high-temperature furnaces requires an oxygen detector to monitor the oxygen content in the air, because if the oxygen content in the air is too high or too little, it may be life-threatening, for example: oxygen concentration> 23.5% rich Oxygen, there is a strong explosion hazard, 20.9% normal oxygen concentration, 19.5% minimum allowable oxygen concentration, 15-19% reduces work efficiency, and can cause head, lung and circulatory system problems, 10-12% shortness of breath, judgment Loss, purple lips, 8-10% loss of intelligence, fainting, unconsciousness, pale face, purple lips, nausea and vomiting, 6-8% 8 minutes, 100% fatal/6 minutes, 50% fatal/4-5 minutes Treatment can be cured, 4-6% convulsions within 40 seconds, breathing stops, and death.
The OXY-FLEX high temperature oxygen analyzer is provided by the OXY-FLEX high temperature oxygen analyzer for the detection of oxygen concentration in the high temperature furnace operation. The supply voltage of the oxygen analyzer is 24V, and there are multiple outputs: 4~20mA, 0~10V, RS232, which can be set by the user Range 0-25% and 0-100%. The entire measurement range is linear. On the one hand, the gas temperature range of the ordinary temperature oxygen analyzer OXY-FLEX-0 is -100 to +250℃; the temperature range of the high temperature series oxygen analyzer OXY-FLEX-0-H is -100 to +400℃. It is suitable for measurement occasions or closed systems where gas is not easy to contact, such as ventilation pipes, flues and containers. On the other hand, in order to directly output the oxygen concentration, the oxygen analyzer OXY-FLEX must be calibrated in air or a gas with a known specific reference concentration. Calibration or re-reference can be achieved by connecting the calibration input terminal to GND, and monitoring the digital cycle output status or the green light status of the signage. During the calibration process, the output can be automatically calibrated to a fixed reference value or manually calibrated to any output value by changing the potentiometer value. The factory default of the fixed reference value is 20.7%, which is the calibration value in ordinary atmosphere; the calibration value can also be calibrated through the RS232 interface in the known reference concentration gas. The calibration value is always saved. Again, automatic or manual calibration can be set by the user. Normal calibration removes the influence caused by changes in the application and atmospheric pressure, and also eliminates the drift problem that may occur during the first few hundred hours of sensor operation.
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