The top cover of the molten sulfur tank is corroded and is very thin
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After disassembling the insulation of the molten sulfur tank, I found that the top plate near the feed inlet was very thin. Fortunately, it was discovered early, otherwise the consequences would be unimaginable. what to do?
How about using stainless steel carbon steel composite panels?
There is no good way, either use good materials or check and replace them regularly.
Use corrosion-resistant paint. I have information here. QQ: 398600441
Does the anti-corrosion coating have any construction performance? How about sending it to see?
The molten sulfur tank is prone to catching fire. Is the anti-corrosion paint probably enough?
1. Leading a degassing pipe into the tank can slow down corrosion. 2. Control the quality of purchased sulfur, especially the moisture content. 3. For safety reasons, configure aisles on the trough.
A chimney should be installed above the molten sulfur tank, and the diameter of the chimney should ensure that the flue gas in the tank can be discharged normally, which can slow down the corrosion of the sulfur tank. At the same time, we should also pay attention to the anti-corrosion of the chimney. You can consider making the chimney jacketed with steam inside to keep it warm.
The three molten sulfur tanks have been in operation for three and a half years, and the tank roofs are 14mm thick. There has always been a chimney, and the emissions were slightly insufficient (one section was shared). In 2008, the exhaust pipes were modified to be separated, and the exhaust was greatly improved. The chimney is made of fiberglass, so there is no problem with anti-corrosion, but the fear of fire has always been a headache. This post was last edited by zxg.wylton on 2009-2-25 10:03 ]
I’m going to make carbon steel and stainless steel composite panels, but what thickness is suitable?
I think there are two solutions. First, add a chimney with tracing steam. Second, to control sulfur acidity, you can generally add soda ash to slow down equipment corrosion.
We have made the chimney, but the carbon steel one is not corrosion-resistant. We changed it to fiberglass but it is not fire-resistant. Prepare to change to carbon steel and add steam trip heating. We changed the soda ash to adding lime powder and saved hundreds of thousands a year. Can the electric trip heater be detachable? Jacket weight and corrosion have always been a problem.
Reducing the acidity of sulfur is a permanent solution. Generally, adding lime or soda ash can be used to neutralize it.
In order to prevent fire, moisture is difficult to control.
Our sulfur tank is connected to a fiberglass pipe and a stainless steel chimney. The effect is pretty good and has been going on for five years. In addition, for safety reasons, a maintenance and inspection platform is laid with rebar and angle steel on the upper part of the tank. Avoid safety accidents.
How thick is stainless steel? Is jacket insulation needed?
Moisture control is not the main thing because the water in the sulfur tank can generally be evaporated. The main thing is that you have to control the liquid level of the sulfur tank, mainly to prevent cross-section corrosion. Also, add a very high air-raid chimney to the sulfur tank. If you can do these two things, there should be no problem.
This problem is a headache for many manufacturers and poses a huge safety hazard. It is recommended to replace it with thickened and high-temperature-resistant PVC material, or line the cover with plastic anti-corrosion and it will be fine.
The top cover of the sulfur tank is the most severely corroded place in the entire sulfur melting process. There is a large amount of SO2, H2S, SO2 flue gas and water vapor. Generally, the corrosion rate of carbon steel is 4mm/year. If the relative humidity exceeds 60% (especially in the presence of water), the corrosion rate will accelerate. Simply using a chimney won't solve the problem at all. I think there are three solutions: 1. Control humidity (sulfur moisture, coil leakage, fire extinguishing water, etc.) ； 2. Add anti-corrosion coating (resin) to the surface of the steel plate ； 3. Add an exhaust system (the flue gas is extracted with a fan, and a washing process is added in the middle). In short, sulfur corrosion is a headache :L
In fact, it is a problem of dilute acid corrosion, and the stainless steel lining cannot withstand dilute acid corrosion. Compared with the anti-corrosion method of the top cover of the empty sulfuric acid purification tower, the problem can be solved by using lead lining.
Already decided: The exhaust pipe is made of carbon steel with heat tracing, and the tank cover is made of carbon steel lined with 2mm stainless steel.