Measurement of moisture after dry adsorption drying
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This post was last edited by zd520525 on 2018-5-15 at 11:11. Our factory produces acid from flue gas generated during the smelting of zinc concentrate, using a two-turn two-suction system! There is no smoke from the exhaust gases, but the moisture level at the outlet of the main fan remains quite high; it can reach over 3, with lower values around 0.3. The actually measured moisture at the main fan outlet does not match the actual performance of the system (flue gas soot); the desulfurization device was not activated. Based on the current analysis of the measurement results, such high values are likely due to analysis errors; whether measurements are taken from the negative-pressure pipeline at the outlet of the dry adsorption tower or from the fan outlet, the values remain high. We use a small glass cyclone, a gas flow meter, a glass fiber U-tube (with a little degreased cotton), as well as a glass fiber and phosphorus pentoxide U-tube – that’s the setup we employ. The volume of the sampled gas should be fine; it’s just that the weight seems to be incorrect. After replacing the flue gas during sampling, it is placed in a dryer. The entire process is wrapped in a towel. But the results of each measurement are very high. I wonder if this has anything to do with the ratio of glass fibers and phosphorus pentoxide added to the U-tube, or whether there is even a specific ratio at all? Are there any peers in the industry who have experience in measuring this moisture content? Any details or precautions they can share would be very helpful to me
Pay attention to applying vaseline to the plug of the U-tube; the outside area should be cleaned thoroughly and allowed to dry
This post was last edited by mkp369 on 2018-5-29 06:10; it can be used to measure the dew point of the flue gas at the outlet of the SO2 fan. If the gravimetric method is used, pre-filtering is crucial; otherwise, the retention of dust and acid will lead to higher measurement values.
It is something that seems simple, but in reality it has always been very difficult to do well. I agree.
It is possible to conduct flue gas dew point tests; the dew point is an intensity property, and it does not require high levels of skill in operation.
It’s difficult to be precise; I’m not sure how other factories measure the moisture content of the water they produce after drying
There must be a dew point meter, dry ice, and propane. The dew point of the process gas at the outlet of the drying tower is measured using the cold mirror method.
We are discussing this issue with the manufacturers of the instruments. The current idea is to use an instrument that can monitor the moisture content in flue gas online; this project is underway, and we hope to meet the monitoring requirements, which would make moisture monitoring much simpler
Has President Sun invested in the online moisture monitoring project?