Wet desulfurization
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Our facility currently has a gas flow rate of 50,000 cubic meters per hour, and the flow rate of the desulfurization liquid is 1,600 cubic meters per hour. The hydrogen sulfide level is very low at present; it’s just that the gas is mixed with liquid. Is the liquid-to-gas ratio too high?
The liquid-to-gas ratio is not very high. 1. It may be that a flow deviation within the tower results in a high gas velocity; 2. Problems with the demisting layer at the top of the tower cause the mist to remain entrained and not to be separated ； 3. Excessive foaming caused by the peroxide regeneration of the solution
I think the liquid-to-gas ratio has little to do with the liquid in the tower sections; it’s mainly the spray density that matters
It is necessary to understand the targeted modifications to the solution spraying method at the tower top
The presence of liquid in the gas stream indicates that the water catcher or demister is not functioning properly. Based on your current circulation rate, it is a bit too high according to conventional design. It has high power consumption. Our experience suggests that half of the circulation volume is sufficient. We do have some experience with wet flue gas desulfurization.
For 50,000 cubic meters per hour of gas flow, should the towers be connected in series or in parallel? Is regeneration carried out in a high tower? Is this the circulation rate for a single tower?
There are generally three situations regarding the entrainment of desulfurization liquid by gas: 1. The desulfurization tower has a small diameter and the gas flow rate is high (due to overloading during operation)； 2. The mist catcher is not turned on, or its effectiveness is poor, or the liquid flow distribution in the mist-catching section is insufficient ； 3. Deviation in the desulfurization tower flow; excessive circulation volume
What is the tower diameter? Is it a single tower or multiple towers in series? Is it operated at atmospheric pressure or under pressure? What is the spray density? The solution circulation rate can be reduced appropriately as long as the spray density and the hydrogen sulfide level at the back of the tower are maintained.
The circulation volume is slightly high, but another possible reason could be issues with the mist catcher.
Trying to reduce the circulation volume by exporting hydrogen sulfide; check the tower structure as well
The diameter of the tower should be at least 5 meters; generally, it is designed to be 5.5 meters. When the hydrogen sulfide level is not high, the circulation rate is kept around 700 m3/h. The temperature of the gas entering the tower is controlled at around 42 degrees