An operational issue with a bubble dryer tower
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This post was last edited by sunjl1981 on 2013-1-7 at 00:26. I would like to ask everyone for advice: our factory uses a drying process that combines a packed tower with a bubble column. The lower part of the bubble column consists of a packing layer; the bubble column section is fed with 98% sulfuric acid from a high-level tank, while the lower packing section uses recycled acid. There are two opinions in our factory regarding this: one is that the sulfuric acid for the bubble column section should be supplied intermittently, and the other is that it should be supplied continuously. In normal production conditions, I believe it should be supplied continuously. I would like to ask everyone, especially those who follow the same process – how do you proceed? # hcbbs
For comparison, how many layers of trays does the upper bubble cap in your factory have? Is it of the one-piece type? Will liquid accumulate there? *e*e
In principle, acid is added continuously, but as long as the amount is well controlled.
Add acid continuously, control the flow rate of the acid being added, and accumulate more experience. . . . . . . . . .
We add acid continuously, and the amount of acid added is usually very small.
To maintain a certain concentration gradient, acid is added continuously.
It must be supplied continuously. It would be best, if there is concern about an increasing amount of acid at the bottom of the tower, to add a flow outlet pipe at the lowest layer of the bubble column section, install a small pump to pump the acid back up, and also add an overflow pipe at that lowest layer so that some of the acid can overflow into the lower packing section. Or control the flow rate of the acid added, adding it continuously while the filler section discharges continuously. This post was last edited by limingshuguang on 2009-4-17 21:23]
A drying process in which a packed tower is connected in series with a bubble column; the lower part of the bubble column consists of a packing layer – an excellent design. It should be added continuously; otherwise, chlorine will escape through the overflow tube. By allowing sulfuric acid to flow in continuously from below the overflow tube, a liquid seal is created. Is there forced circulation at the lower part of the bubble column? This also helps to maintain the concentration of circulating acid. If it is disconnected, the upper part serves little purpose and cannot function as a check mechanism. This post was last edited by pzhhuagong on 2009-4-10 14:27.]
This is the process we use: the acid for the high-level tank of the two-in-one tower comes from the acid discharged by the chlorine compressor. The acid from the chlorine compressor is pumped from the storage tank to the high-level tank of the two-in-one tower, while the acid at the bottom of the tower is circulated back to the packing section of the two-in-one tower by an acid pump. The acid used in the packing tower ahead is supplied by the two-in-one tower, drawn from the high-level tank; a continuous acid addition process is employed
Sulfuric acid should be supplied continuously!~!~!~!~
Which one says it’s intermittent: lol, I’ve never heard of it! This post was last edited by 181128425 on 2009-4-11 00:40]
What is connected in series with this acid addition valve? We use a radioactive density meter to control it. When the load is high, the amount of chlorine gas is large, and the acid valve remains open automatically, so there is always some liquid present. At low loads, less chlorine gas is produced, and there is also less water; the acid available for circulation at the bottom is sufficient, so it’s possible to make intermittent additions or keep the valve slightly open. (The problem is that if the load is too low, it’s difficult to achieve good control using cascade control; in such cases, it’s better to let the valve operate intermittently.) This post was last edited by limingshuguang on 2009-4-17 at 21:30
A sulfuric acid metering pump is installed in the process to supply acid continuously to the bubble column; samples are taken during the day to analyze the acid concentration in the packed column. By controlling the acid flow rate, it is possible to achieve cost efficiency and safety, as well as proper control over the moisture content of chlorine gas. This post was last edited by limingshuguang on 2009-4-17 at 21:34
Acid is added continuously, but the acid circulation volume in the lower section of the packed tower must be adjusted by discharging dilute acid continuously based on the amount of acid added; this is necessary to ensure continuous acid addition in the upper section. Otherwise, control becomes unstable, leading to fluctuations in chlorine absorption capacity and instability in the water content in the chlorine
Agree with the comment above; the amount of acid to be added should be determined based on the water content in the gas outlet
Our traditional process once used intermittent acid addition, which was not very reasonable; it has long since been replaced by continuous metered acid addition.
The bubble column section requires a continuous supply of acid; our plant uses this type of combined tower, and a disruption in the acid supply can lead to an increase in chlorine content in the water.
It is recommended to add acid continuously; this tower is designed as an integrated bubble and packing dryer, with the aim of drying the gas more effectively. While adding acid intermittently might result in less acid being used, the effectiveness is not very good. If acid addition is indeed to be done intermittently, it is necessary to ensure that the gas in the packing section has reached the desired level of dryness, but it’s likely difficult to detect this!
It should be determined based on the processing volume; generally, acid needs to be added continuously. However, attention must be paid to the adjustment of the metering pump. Acid is added not only to absorb water but also to lower the temperature in the bubble column section. If the temperature exceeds 15 degrees, it becomes quite problematic