Is it a control scheme in which only the main fan of the sulfur recovery unit is operated, while the fan of the incinerator is not?

Flue gas treatment for sulfuric acid production at 60°C low temperature, with by-product sulfuric acid.

Irrelevant answer; suspected advertising! ! ! :L

Energy savings are also relative; the main fan uses high-voltage electricity of 3600V, while the fan in the incinerator uses low-voltage electricity of 380V. Under normal operating conditions, the current of the main blower is 36A, while that of the incinerator is 70A. However, when the main blower is used to supply air entirely, assuming its current remains at 38A, the cost calculation shows that the price ratio between high-voltage and low-voltage electricity is 3,000 to 1. This is where I get confused...

I’ve learned it; I hadn’t thought about it this way before. It makes sense.

This post was last edited by liaifeng on 2021-12-24 at 19:01. Let me answer my own questions here.:L 1. Does the exhaust from the main fan go into the exhaust of the incinerator fan after heat exchange, or does it go directly into that exhaust without any heat exchange? The main fan outlet is connected directly to the burner fan outlet without going through any heat exchange. 2. In practical operational control, how to address the impact of fluctuations in acid gas flow on the air demand of the incinerator at the outlet of the main fan? Based on our actual operational experience, fluctuations in acid gas have a relatively minor impact on the main air flow and the entire air supply system in the front section; on the other hand, changes in the air volume of the burner in the rear section have a greater impact on the front section. 3. Since the outlet of the main fan is now divided into three air supply paths, and each of these paths involves associated interlock settings, has the interlock system been adjusted accordingly as a result of this process change? The associated interlocks are adjusted accordingly, which is pretty much as I had envisioned. 4. It would be best to also include relevant control circuits or DCS screens for clearer explanation. It’s just that a control valve was added at the main air outlet to control the pressure! 1. Is it energy-efficient? Judging solely from the actual operating results, there is indeed a certain degree of reduction compared to running two units. When only the main fan is operated, under the same operating conditions as before, the current increases by 2A. The unit operates at a high voltage of 6000V, resulting in an increase in power consumption by 12KW. Under identical conditions, when the incinerator fan is turned off, the current is 100A; this fan operates on industrial electricity at 380V, with a power consumption of 38KW. Thus, there is a relative saving of 26KW in power consumption, which differs from the value provided by the design engineers. 2. Is it safe? In terms of practical operation, the difficulty level increases somewhat, but it remains controllable. Regarding the adjusted interlocking, I personally believe that the safety level has decreased relatively.

Doing this indicates that the production load of your equipment has not reached the designed level, or that the main fan was sized too large during the design process!

The design load of sulfur recovery units is generally between 30-110%, and the selection of equipment is based on the actual maximum value; indeed, the situation you mentioned does exist! However, under normal circumstances, the operation efficiency of sulfur recovery units is around 50-70%, and there are two or more such units to balance the load of acidic gases throughout the plant; this shows that this method indeed has practical viability.