What are the hazards of flue gas trailing in catalytic flue gas desulfurization?

The tailing indicates a high level of dust present; this is due, firstly, to possible increased carryover or loss of catalyst, and secondly, to a reduced dust removal efficiency. The hazards include wear and damage to pipeline equipment, increased energy consumption, the possibility of emissions exceeding specified limits, which leads to environmental pollution and may result in fines or even shutdowns; P

The problem lies in flue gas purification – the sulfuric acid mist isn’t removed, but there are no standards in place, so people take advantage of this

The problem lies in flue gas purification – the sulfuric acid mist isn’t removed, but there are no standards in place, so people take advantage of this

In the flue gas from catalytic cracking regeneration, SO3 accounts for about 5%–10% of the sulfur oxides. The hazards posed by SO3 are much greater than those of SO2; it directly leads to an increase in the dew point temperature of the flue gas, causing severe corrosion of equipment operating at low temperatures. It also results in the formation of blue smoke plumes, and is the main factor affecting the color of the purified flue gas as well as its opacity (turbidity). S03 is a substance that absorbs moisture very easily; when the temperature exceeds 200°C, as long as there is about 8% water vapor in the flue gas, 99% of the S03 will be converted into H2S04 vapor. When the flue gas temperature is below the dew point temperature of H2SO4 vapor, the H2SO4 vapor condenses to form sulfuric acid droplets; those droplets with a size of 0.5–3 um give rise to sulfuric acid aerosols and mist, resulting in blue or yellow plumes of smoke.

It looks worse at night than during the day, with smoke drifting far away

Before entering the desulfurization tower, the flue gas must be rapidly cooled to a temperature well below 200 degrees. After that, the flue gas is subjected to alkaline washing for desulfurization; however, the effectiveness of this alkaline washing process may not be optimal, and it’s likely that the temperature will remain above the desired level. It’s also important to check whether the amount of alkaline solution used and its circulation rate are normal, as well as to ensure that no nozzles or pipelines have become detached or broken

The flue gas must be rapidly cooled before entering the desulfurization tower – Task Platform

The measures for removing whiteness and blue tint are different; by default, I assume tailing treatment refers to removing whiteness. There are already refineries in China that have installed facilities for this purpose – you can contact me via private message.