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The role of CO dilution function in flue gas analyzer
Date: 2023-08-29Read: 1
Some flue gas analyzers on the market have CO dilution function, especially those used for measuring high-power combustion systems. CO dilution functionPrevent potential harmful gases in exhaust emissions from combustion systemsIt played a crucial protective role. Its working principle and function are as follows:
01 Working principle of CO dilution function
A smoke analyzer captures emitted gases from a combustion system or internal combustion engine and conducts them to sensor chambers for detection. Each chamber contains a gas sensor for measuring the concentration of specific gas components.
High concentrations of CO can harm human health and also damage measuring and analytical components. Therefore, the CO dilution function is also an effective measure to protect the flue gas analyzer.
A well functioning combustion system produces very little CO gas. On the contrary, when the combustion system operates poorly, a large amount of CO gas will be generated. It is very dangerous for the gas sensor in the flue gas analyzer to be exposed to a high concentration of CO environment. At this time, it is necessary to dilute the high concentration CO to achieveThe purpose of protecting the smoke analyzer and components.
Users can define their own limits for CO dilution, and when the CO concentration exceeds the defined limit,The smoke analyzer will automatically activate the CO dilution function.
It is usually recommended to set the limit value as1000 ppmor1500 ppm.The lower the limit value, the stronger the protection for the CO sensor.Therefore, there is no need to set particularly high concentration limits to overload the sensor.The limit value that can be set for the Solman Si-CA 230 flue gas analyzer is 100-4000 ppm
When the set value is exceeded, the analyzer will activate the built-in second air pump to draw ambient air into the CO sensor chamber for dilution purposes.
This function dilutes high concentration CO gas in a controllable manner.
The above is the working principle of the CO dilution system:Protect the CO sensor by reducing the concentration of CO gas entering the gas sensor.
02 Under which circumstances is the CO dilution function particularly important?
Measure using a smoke analyzerHigh power or lack of maintenanceThe operating status of the combustion system and the composition of the flue gas.
At this point, the CO dilution function can significantlyreduceCO gas sensorOperational burden, helpfulextenditsuselifespan.
In order to save engineers time in analyzing and debugging the combustion system, the flue gas analyzer needs to continuously measure and analyze without interference until the system and equipment are debugged.
If there is no CO dilution function, the debugging process may be affected by high CO concentration,Force engineers to pause measurementsWait for the flue gas analyzer to discharge high concentration CO gas.
For engineers engaged in combustion system debugging and maintenance work, whether it is high-power combustion systems or low-power wall mounted boiler equipment, they may emit high concentrations of CO gas during the debugging process.
For combustion systems and equipment using liquid or solid fuels, they are more likely to emit high concentrations of CO gas.
Combustion systems or equipment require comprehensive maintenance and upkeep. Within a few minutes of restarting the combustion system or equipment, a large amount of CO gas will be released, which is related to residues and mixing uniformity.
03 How to operate a flue gas analyzer without CO dilution function?
If your flue gas analyzer does not have CO dilution function, you can refer to the following solutions:
1
Choose an analyzer with a high tolerance CO gas sensor:This type of CO gas sensor has high concentration CO resistance and can withstand the impact of high concentration CO gas without failure.
Product recommendation:Si-CA 030 / Si-CA 130
Advantage:Among the same priced flue gas analyzer products, its CO gas sensor can measure high concentration CO gas up to 8000ppm, which is widely used in various commercial and industrial combustion systems.
2
The peak CO generated after waiting for the combustion system to start will automatically dissipate:Especially after repairing the combustion system. When high concentration CO gas appears, it does not necessarily mean that the system has malfunctioned. Regardless of the fuel, a CO peak (high concentration CO gas) will appear every time the combustion system is turned on.
3
In combustion systems that use fuel as fuel, attention should be paid to the circulation pressure and flow rate of the fuel,Avoid fuel pipe blockage or insufficient internal pressureBoth of these situations can lead to uneven fuel atomization or poor mixing, resulting in a large amount of high concentration CO gas, as well as larger fuel atomization particles escaping from the combustion zone, which will cause economic losses (fuel atomization particles will exacerbate the acceleration loss of the filter element in the condensate tank when not fully burned).
4
Set a protection limit for the CO gas parameters of the flue gas analyzer:When the concentration of CO gas exceeds the set limit, the analyzer will automatically stop the pump to prevent higher concentrations of CO gas from entering the sensor chamber in the future. This is a method for safety protection of CO gas sensors: it not only extends the service life of the sensor, but also allows for continued analysis and measurement of high concentration CO gas components in the combustion system.
For a CO gas range of 8000 ppm, set below5000ppmThe limit value will be more helpful in extending the service life of the sensor, and7000 ppmThe limit values will enable detection of various types of combustion systems.
Si-CA 030 /Si-CA 130：
Equipped with high concentration CO automatic protection function, users can set the limit value at their own discretion1000 ~ 8000 ppmAdjustment within the scope.
Si-CA 230：
Its CO automatic protection limit can reach10000 ppmAnd it has a powerful high concentration CO dilution system, which can measure up to when the dilution system is turned on50000 ppmHigh concentration CO gas component.