Do you have any good suggestions for removing acid mist during the pretreatment process?
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During the preprocessing stage, acid washing is sometimes necessary to remove impurities from the sample gas, but this often introduces acid mist into the sample gas, thereby corroding the analysis instruments. When it is not possible to replace pickling with another method, our company generally uses a condensation filter to condense and remove the acid mist from the sample gas, but the results seem to be average. I’m curious about the effective methods that those of you using this platform have adopted to eliminate the acid mist left after pickling; let’s share our experiences.
First, you need to tell us the main components of the process medium gas, because different gas compositions require different preprocessing methods. Some of the components used for preprocessing, such as filters, have adsorption and desorption functions; moreover, washing may remove useful gas components, which can affect the accuracy of the measured values. The general conventional method 1 is as follows: 1. If there is a large amount of acid mist, it is first washed in a water washing tank. (The premise is that, except for acids, other gases are insoluble in water.) 2. Cooling is achieved using vortex refrigeration tubes, which remove most of the water. Or use semiconductor high-precision temperature refrigeration for water removal (higher cost). 3. Add a bypass line to reduce latency and simultaneously lessen the burden on downstream sample gas dehydration. 4. Install a coalescer to improve water removal; fit a desiccator for water removal before it reaches the gauge, so that the gauge will function without any problems. Long-term use of this method causes significant corrosion to wash-down irrigation systems. It should be noted that a small amount of acidic gas does not cause any corrosion to instruments when they are in a dry state; the key is to remove water, as there is basically no acid left after washing. There is another method: it’s more expensive, requires less complicated preprocessing, and needs the least amount of maintenance. Our company has implemented both approaches on site; you can get in touch with me for details – my QQ number is 114814640, and we can discuss this further.
I only know the washing method; the guy on the second floor is really great and strong!