PH of the quench tower in the sulfur recovery unit
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I would like to ask all fellow sea workers: what is the pH value of the water in the quench tower of your sulfur plants? Is there a specified range for this value, and what are the methods used for controlling it? What are the factors that affect the pH of quench water?
Quench water generally does not require strict control of pH, nor is it necessary to deliberately adjust the pH of the process water introduced. But using an online meter to monitor pH is required by the process
It should not be acidic; generally, ammonia water is added to adjust the acidity or alkalinity.
Under normal conditions, the pH of quench water is 6-7, so no adjustment of pH is required. When the reduction conditions of sulfur-producing exhaust gases are unstable, the SO2 in the exhaust gases is not fully reduced; as a result, SO2 dissolves in the quench water, exacerbating equipment corrosion. Generally, we control the pH by replacing it with quench water
Here, the control range is 6.5–9, but it’s usually between 7.5–8.5; it generally doesn’t exceed this range. If it’s occasionally too low, deoxygenated water can be used to adjust it!
The pH value in the quench tower is generally between 7 and 8; a lower value accelerates the corrosion of the equipment. Typically, an alkali addition system is used once a day to adjust the pH, or it is controlled through the circulation line at the bottom of the desulfurization tower.
Is this Scott’s exhaust gas quench tower? It is best to keep it above 6.5. In emergency situations, alkali solution or replacement water can be used, but this only provides temporary relief and does not solve the underlying problem. High levels of sulfur dioxide in the process gas and misty sulfur can both cause a decrease in pH. Immediately reduce the air supply to the spark ignition furnace in order to lower the sulfur dioxide level and increase the hydrogen content.
It is generally not recommended to add alkaline solutions; ammonia is usually used to increase the pH. After the operation becomes stable, it depends on the operating conditions to determine whether a thorough replacement is necessary