Second suction and first suction for sulfuric acid production

The main problem is the SO2 content in the acid. The acid should be produced in the first suction. The higher the acid temperature, the less sulfur dioxide will be dissolved.

In terms of the amount of sulfur trioxide absorbed by the second suction, the total amount of acid produced by the second suction only accounts for about 10% of the first suction. This will inevitably require a large amount of acid to be supplied to the second suction in the first suction, which will cause instability in the second suction, affecting the increase in the absorption rate, and ultimately causing an increase in exhaust emissions. Of course, there are many other reasons that I won’t list in detail. :P :P :P :P

Please give me some advice from an expert. Let us learn from it.

This will inevitably lead to a large amount of acid being transferred to the second inhalation in the first inhalation, which will cause instability in the second inhalation and affect the improvement of the absorption rate. --------It's true that a large amount of acid was passed through the first suction to the second suction, but when I took the second suction, the excess acid was returned to dryness. The amount of circulating acid in my second suction did not change, and it did not affect the liquid level between the three towers. What do you mean by affecting the absorption rate? Is the sulfur dioxide in the first breath decomposed into the second breath? The amount of circulating acid remains unchanged, most of the acid is dried, and the sulfur dioxide analyzed in the circulation tank is also sent to the air inlet of the drying tower through the negative pressure of the trachea. Will it affect exhaust emissions?

Although the liquid level has not increased and you have reached dryness, this is contradictory to the original intention of your question. Your question is, is there any specific difference in the acid output between the two (the second suction and the first suction are independent of each other and not connected)? Also, discuss what are the pros and cons of bisonic acid production? I think that for the load of the two-suction circulating pump * * Increasing the size will result in a waste of energy and acid cooling problems...the gain outweighs the gain. Why not use a one-suction circulation pump to output it directly? In addition, a large amount of it is sent to the drying string. Is your product 93% or 98% sulfuric acid? Replenish: The fluctuation of the acid concentration in the secondary absorption concentration is unstable for absorption and will of course affect the absorption rate. This post was last edited by limingshuguang on 2009-2-7 15:18 ]

What you said makes sense: Load of secondary suction circulation pump * * Increase the size, resulting in energy waste and acid cooling problems... . I agree with this analysis. I thought it would be cleaner to produce all the acid from the secondary absorption, but it seems there is no need to do so. That product is still 98% acid, I just talked about drying out the excess 98% acid at first, :loveliness:

The disadvantage of pumping acid in the main circulation of the absorption tower is that it affects the amount of acid on the upper tower. Some manufacturers adopt the method of setting up a finished product tank. The circulating acid in the absorption tower overflows into the finished product tank, and the acid is transported by the finished acid delivery pump. 　

The main consideration for first and second suction is environmental pollution. In fact, the sulfuric acid production is completed after the first suction. The main consideration of adding the second suction process is actually an environmental issue. This can * * Improve the utilization rate of sulfur dioxide and reduce the concentration of emissions into the atmosphere. This will comply with my country's increasingly stringent sulfur dioxide control.

Acid production in the first suction: the liquid level in the first suction circulation tank controls the amount of acid produced, and the liquid level in the second suction circulation tank controls the amount of acid produced from the second suction to the first suction, but the sulfur dioxide content in the acid produced is relatively high. Second suction acid production: The liquid level of the second suction circulation tank controls the amount of acid production, and the liquid level of the first suction circulation tank controls the amount of acid flowing from the first suction to the second suction, but the flow rate of the second suction pump increases.

Our company uses a two-turn and two-absorption process. The main acid production is in the first suction. The concentration of the acid is mainly adjusted by adding water to the dryer in the first suction and the second suction with acid. The second suction mainly absorbs the sulfur trioxide produced by the second turn. The output is very small. The acid concentration is controlled by adding water. This method can easily control the acid concentration in the second suction. However, attention should be paid to its indicators, otherwise it is easy to produce tail gas.

We have three circulation tanks connected in series with subsea valves and use overflow acid flow. Share it with everyone

Secondary absorption produces less acid, and less sulfur dioxide is dissolved in the acid.

There is not much difference in the 98 acid produced (if the yield is not considered). However, the conversion rate of one-turn and one-suction is generally not as high as that of two-turn and two-suction, which causes a difference in yield. At the same time, because the two-to-two-suction conversion rate is high, the tail gas emits less sulfur-containing gas, which is also conducive to meeting the tail gas standards and reducing tail gas treatment costs.

For an acid-making device with a purification process, if the dry water absorption balance allows, the first suction and drying can be carried out in series, and the second suction can be controlled by adding water to control the acid concentration. The advantage of this is that it simplifies the acid stringing process. This post was last edited by Changzhi on 2009-4-11 07:39 ]

The secondary absorption output is small. It is mainly used to absorb the sulfur trioxide transferred from the secondary absorption. This not only increases the output, but also improves the environment and meets the requirements of environmental protection.

Just use the same circulation tank for the first suction and the second suction. Building two troughs is a bit wasteful.

I think this is related to the absorption process. Our company's sulfur acid production has three towers and one tank, and cross-circulation (the dry acid return acid supplies the second suction with acid, the second suction acid returns acid to the first suction, and the first suction acid return acid is dried and acidified after adjusting the acid concentration and acid temperature). In this case, we produce acid in the second suction, which is equivalent to adding a desorption tower in front, and the sulfur dioxide contained in the acid is greatly reduced.

Are fuming sulfuric acid and 98 acid produced in the same tower?

I think merging the first and second suction grooves together has an impact on the exhaust gas and reduces the conversion rate.