Is desulfurization of coke oven gas in a single tower feasible?
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The preliminary design for our plant calls for the use of a single tower for desulfurization, with the regeneration tank located above the desulfurization tower; the regenerated desulfurization liquid then flows into the tower due to gravity. I am very skeptical about the effectiveness of this desulfurization method. After prolonged operation, the packing gets clogged with sulfur, resulting in vapor-liquid skew flow and severely affecting the desulfurization efficiency! Secondly, the regeneration tank is placed at the top of the desulfurization tower; how can one observe and adjust the regeneration of the desulfurization liquid? May I ask, do the companies run by you all use single-tower desulfurization? How effective is it?
If only one tower is in operation, how can maintenance be carried out if there are problems? It is best to operate with two towers, one in use and one as a backup.
Desulfurization towers are hardly ever maintained, except for cleaning the packing. So far, there have been no reports of backup desulfurization towers in chemical plants. The idea of using one tower for desulfurization is good, and it’s theoretically feasible, but in practice it’s not as simple as it seems. How can one monitor the regeneration process in the regeneration tank? And how can the flow rate of the desulfurization solution be adjusted in a timely manner to ensure proper regeneration? Which senior has worked with single-tower desulfurization, and what were the results?
The performance is fine; it’s just troublesome during maintenance
The two towers can operate either one at a time with the other as a backup, or they can run simultaneously; it depends mainly on the sulfur content in the gas. It’s not necessary to use one tower at a time and the other as a backup – flexibility is possible. In normal production at our factory, a large amount of gas is required, so we operate both towers; when production is limited and less gas is needed, we operate one tower while keeping the other as a backup. If you insist on running it with just one tower, that’s fine too; I hope there won’t be any **troubles** at that time.
This post was last edited by Yan Xiangsi on 2009-6-25 at 14:22. You may have misunderstood; I meant that the regeneration tank is placed at the top of the desulfurization tower, and the two are combined into what is known as a single-tower desulfurization system. Are the regeneration tank and the desulfurization tower in your plant two separate units or combined into one? Is manual periodic inspection of the regeneration process carried out in the regeneration tank, or are other advanced methods used for control? What type of desulfurization liquid is employed? Thank you for the advice!
I hadn’t heard of it before, but it seems to be somewhat difficult; there are constraints on adjusting the flow rate.
I have come into contact with desulfurization towers of the type mentioned by the original poster, and they are indeed feasible; there is no dispute regarding this. Whether to use a single tower or multiple towers for desulfurization depends on your requirements for desulfurization, namely the target levels of pollutants after the tower; in addition, factors such as the hydrogen sulfide concentration before the tower, the desulfurization process to be used, and the gas pretreatment process also need to be taken into consideration.
Dual towers are more reasonable; they can be connected in series or in parallel, and used as active units or as backups. Additionally, if a high level of gas desulfurization is required, two towers in series is also a good option.
It’s the first time I’ve heard of desulfurization and regeneration being combined; the device itself isn’t very large, so that’s not a problem. What matters most is the sulfur content in your gas and the requirements for the parameters after desulfurization. Put them together to save space.
Xinjiang Bayi Iron and Steel is what you refer to as the so-called tower-based desulfurization method; as long as there is sufficient air flow, the desulfurization effect will be achieved
I think Ansteel is using it, while Bagang was designed by Ansteel.
This system was designed by Ansteel Design Institute; it occupies less space and offers good desulfurization performance. The Bayi Steel Plant in Xinjiang uses this technology. Depending on the sulfur content in the gas and the requirements for the gas after desulfurization, it is possible to use either one system alone or two systems in series. However, there is a problem: gas often escapes from the discharge pipes of the bottom circulation tank, sometimes in large quantities, which can be dangerous during thunderstorms. I wonder if anyone with expertise could suggest a solution.
Combining two towers into one is indeed novel and theoretically feasible; I wonder what the actual performance will be like? Question 1: The height of the regeneration tower is quite high, right? The operation control is quite inconvenient, isn’t it? (This makes it difficult to ensure process stability) Question 2: What is the pressure in the desulfurization tower? It’s difficult to ensure that the gas from the desulfurization tower doesn’t leak into the regeneration system, right?
It’s better to have two towers; this way, when the amount of gas is high, both towers can operate simultaneously, while when the gas volume is low, only one tower is needed. Additionally, it’s more convenient if maintenance is required, as desulfurization can continue without shutting down the operation!
If the foundation is made more solid, that should solve the problem. If the regeneration tower is located on top of the desulfurization tower, I imagine both towers will be of a short and robust design; the key is to take into account the mass transfer issues
It’s truly novel; I’ve never heard of it before. When ammonia in gas is used as the base source, the amount of compressed air should not be too large, as this can lead to excessive loss of ammonia. The regeneration effect depends on the yield of sulfur foam. There is also the hydrogen sulfide content in front of and behind the tower.
This type of device has been seen in Tangshan; the same manufacturer mentioned the risk of gas release from the circulation tank
Our plant uses a single-tower desulfurization system, with MDEA solution for desulfurization, and the results are good
Which design institute designed it? That will help you save money; of course, it’s possible to do so if the process parameters allow it
Residence time, sufficient circulation volume – it conforms to the principles! There should be no problem! !