How to choose a flue gas analyzer
How to choose a flue gas analyzer
The flue gas analyzer works in two ways:
One is the electrochemical working principle, and the other is the infrared working principle.
At present, the portable smoke analyzer on the market is usually a combination of these two principles, electrochemical smoke analyzer manufacturers generally have Germany Fizo, Germany MRU (Germany Tetu) domestic Tianhong response, etc., infrared smoke analyzer manufacturers generally have Germany MRU, Germany MRU
1. Sensor:
The measurement units related to the current mainstream smoke analysis devices mainly include two kinds of sensors
1) Electrochemical sensor:
Benefits:
A small: So handheld models generally use electrochemical.
B Cheap: It’s cheap. When the budget is low, an electrochemical sensor smoke exhaust analyzer can be selected.
Disadvantages:
A slightly worse accuracy: the general error is 5% of the reading, which only meets the requirements of national environmental protection standards.
B Crosstalk: The electrochemical sensor is susceptible to interference from other gases, and the error of the measurement results increases.
C Short life: life is generally 2-3 years, often consider replacing.
2) Non-distributed infrared sensor:
Benefits:
a accurate measurement: the general test results do not exceed 2% of the full scale, and can be used as an analytical precision instrument.
No b cross interference: Due to the measurement principle, other gases will not cause test interference to the infrared sensor.
Long life: infrared sensors generally have no life concept, the use time is very long, generally more than 10 years, no special maintenance is required daily, has gradually become today’s mainstream sensors.
Disadvantages:
A The price is a bit high: the price is generally several times to ten times that of electrochemical sensors.
2. Sampling system:
The sampling system of flue gas analyzer is divided into conventional sampling system and heating sampling system.
1) Conventional sampling system: acid and alkali resistant, high temperature resistant plastic pipe is generally used to ensure no adsorption of gas.
Application: Short time test of gas with low water content; Short time test of sample gas without acid gas.
2) Heating sampling system) On the basis of the conventional sampling system, the heating function is introduced to ensure that the sample gas temperature is above 120 during the sampling process and that there is no water condensation during the sampling process.
Application: high water content sample gas test for a long time continuous online test; Acid gas (e.g., NO2, SO2) content determination;
3, sample gas treatment system:
1) Steam separator: remove liquid moisture, mainly in the handheld model using the water removal system.
Application: no acid gas (such as SO2, NO2) test; Environmental protection department on-site inspection of sampling boiler combustion efficiency test. 2) Peltier electronic refrigerator) the sample gas temperature is instantly reduced to 5, and the sample gas moisture is instantly removed to ensure that the sample gas entering the test pool has a low water content at the standard temperature, so that the sensor can be accurately tested.
Application: sample gas containing acid gas (such as SO2, NO2) test; Test of gases containing water in the sample gas; High temperature gas composition test; University research institute related desulfurization out of stock experiment; Long contact online test; The infrared sensor test project must choose the boiler combustion experiment; Experimental project on new energy development and utilization.