Acid mist detection and SO3 detection in the furnace gas at the outlet of the absorption tower of the sulfuric acid plant

The two things are different. SO3 is a gas, while acid mist is sulfuric acid droplets. Environmental testing measures SO3 emissions. Acid mist mainly corrodes pipelines and directly falls on nearby corrosion equipment.

Can the two be effectively separated during detection? 2# min7711

1. Determination of sulfur trioxide content in flue gas: The furnace gas passes through the moistened cotton plug, in which the sulfur trioxide combines with water to form acid mist and is filtered by the cotton. Dissolve the acid mist captured by the cotton plug in water, first titrate the sulfur dioxide adsorbed on the cotton with standard iodine solution, and then titrate the total acid amount with standard sodium hydroxide solution. Calculate the content of sulfur trioxide based on the amount of standard solution consumed during titration and the volume of gas sample passed through. 2. Determination of acid mist content in flue gas: Suction and filter the acid mist in the gas into the filter tube of the cotton plug. Then place the cotton plug with the acid mist adsorbed in the water. First titrate the sulfur dioxide adsorbed on it with iodine solution, and then titrate the total sulfuric acid amount with sodium hydroxide solution to obtain the acid mist content.

It seems that they are still inseparable, just deducting SO2 through the iodine method.

1. Make acid mist first, replace SO3 with air, and calculate the acid mist. 2. Then use the "Sulfur Trioxide Content Determination" to measure the total amount of SO3 and acid mist, and then subtract the amount of acid mist to get SO3. Personal thoughts, I don't know if you have any good suggestions.

answer: Excuse me: How to replace SO3 with air? 6# cnoocwyj

Haha, I am an instrument maker. From our point of view, acid mist can be measured directly with an acid mist content detector. SO3 gas should be measured with a gas detector. According to our understanding, the two can be measured separately. What everyone above is talking about is mainly about the sampling and testing method. According to our understanding, the sampling and testing method is definitely no problem in principle, but in actual operation, sampling is often a difficulty. It is difficult to accurately reflect the content of the sample you sample and actually reflect the real situation in the process equipment. Because the error of manual sampling is very large.

I would like to ask, how much does everyone measure the Cl content in the boiler water? We are a secondary filtration.

Aren’t we all using conductivity detection methods to measure the acid mist concentration at the entrance of the tower? Why are you just talking about something useless?