How to prevent the occurrence of sublimed sulfur in sulfur-based acid production

The inlet pressure of the sulfonate gun increases (except in cases of clogged nozzles). Generally, the inlet pressure of the sulfur gun and the liquid sulfur flow meter need to be monitored simultaneously! The formation of sublimated sulfur generally occurs at the beginning of operation due to improper control of sulfur spraying. It is possible to keep records of the blower speed and the sulfur purification pump speed when each device is operating normally. At the beginning of operation, the blower speed remains constant, and it is fine if the speed of the sulfur purification pump is slightly lower than normal. Furthermore, the interlock between the blower and the sulfur purification pump must be activated; otherwise, when the blower stops operating for some reason, the sulfur purification pump will continue to spray sulfur. . . . . Then it’s not just a matter of sublimating sulfur.

Additionally, atomization of sulfur using a gun is a necessary condition; the ratio of air to sulfur must be appropriate, and the sulfur must stay in the furnace for enough time so that the air and sulfur mix evenly.

This post was last edited by A Sha on 2011-11-18 at 22:54. Reply to #1 Danzhi: The occurrence of sublimed sulfur in sulfuric acid plants generally happens during the startup process, especially after the fans are turned on and air enters the system. Operators worry that the temperature during sulfur burning and conversion might drop too rapidly; thus, they immediately start sulfur spraying operations. This is a phase when sublimed sulfur tends to form more easily. In fact, controlling the oxygen-sulfur ratio (and thus the rate of temperature increase in the sulfur incineration furnace) relies on experience gained through production. In our 300,000-ton sulfur production facility, sulfur injection begins when the wind pressure at the furnace inlet reaches 7.5–8.5 kPa, which prevents sulfur from sublimating. 2. In a sulfuric acid production system that uses sulfur as raw material, under normal operating conditions, with a stable amount of sulfur sprayed in and an adequate oxygen supply, it is impossible for sublimed sulfur to be generated during the production process. Therefore, many manufacturers neglect the prevention of sublimation sulfur accidents. When sublimed sulfur appears in the sulfur-based acid production system, there are no significant changes in the process parameters for a long time, making it difficult to detect this issue. a) Before increasing the amount of sulfur added during production, it is essential to have a thorough understanding of the production system; one must avoid increasing the sulfur dosage blindly, and it is important to ensure that the sulfur burns completely in the furnace, resulting in a bright and clear interior of the furnace. b) When increasing the sulfur dosage, it is necessary to follow the principle of adding small amounts multiple times, with intervals between additions. Avoid using irresponsible adjustment methods that involve drastic changes all at once. c. Pay constant attention to the acidity level, as when sublimed sulfur appears in the sulfur-based acid production system, the first sign of this is the appearance of a milky white color in the acid.

As long as the fan keeps running, or in other words, as long as the furnace gas valve is not forgotten to be opened, sublimated sulfur will not occur in principle. During driving, sulfur is usually added based on the burning color of the sulfur combustion furnace, so this should not happen either. In other words, as long as you don’t doze off, keep an eye on the temperature, and implement proper cascade protection, everything will be fine.

Here, we mainly blow through the gun quickly after parking it, to ensure that no sublimated sulfur appears; this generally does not happen during normal production

We have also experienced relatively serious incidents of sublimated sulfur when producing acid from pyrite, which forced us to shut down the plant for handling. From now on, just judge by the color of the slag and the color of the dilute acid!

In sulfur-based acid production, when sulfur sublimation is particularly severe, a large amount of sulfur sublimation particles end up in the 93 acid tank; as a result, the secondary voltage of the electrostatic precipitator cannot be applied, leading to frequent discharges. As mentioned on the fourth floor, c) one should pay constant attention to the acidity level; when sublimated sulfur appears in the sulfur-based acid production system, the first sign of this is the appearance of a milky white color in the acid. Recently, our factory has encountered this issue suddenly, but there has been no sublimated sulfur – what could be the cause?

Reply to 8# hyjyyp: These guys are trying to fool us. Where would the electric mist removal come from in the process of producing sulfuric acid? Haha, there’s no way electricity can even be supplied!

Reply to 9# shen*rong2006: Am I bragging? It’s you who is uninformed; we are currently roasting solid sulfur. When the price of sulfur is high, it’s completely possible to roast sulfur concentrate. What’s impossible about that? It seems there are also friends who are familiar with our factory on the Haichuan Forum.

Reply to 10# hyjyyp: Haha, so it’s still the sulfur process used for acid production from pyrite; it can also be considered a special process for producing acid from sulfur. It’s normal for this system to have electric mist removal – if it didn’t, that would be unusual. I guess I’m a bit uninformed on this topic