Sulfur Recovery Daily Question 2018.12.31
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Why is it necessary to add ammonia in the quench tower? Answer: Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is practically insoluble in the slightly acidic quench water, whose pH level is between 6 and 7. Therefore, no ammonia needs to be added to the quench water. However, if there are fluctuations in the operation of the device, the levels of S02 and S in the Claus off-gases become high. In addition, hydrogen reduction is incomplete within the exhaust gas purification reactor, resulting in a certain amount of S02 in the off-gases that enter the quench tower. S02 is soluble in water and has strong acidity, which causes the pH value of the quench water to drop. This increases the corrosion of the packing and the tower structure in the quench tower. At such times, ammonia should be added to the quench water, or deoxygenated water should be used to replace it, in order to maintain the pH of the quench water between 6 and 7 and thereby reduce corrosion of the equipment and pipelines.
Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is hardly soluble in the slightly acidic quench water, whose pH is between 6 and 7, so no ammonia needs to be added to the quench water.
Answer: Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is practically insoluble in the slightly acidic quench water, whose pH level is between 6 and 7. Therefore, no ammonia needs to be added to the quench water. But once there are fluctuations in the operation of the device, S02 and S in the Claus off-gases
Answer: Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is practically insoluble in the slightly acidic quench water, whose pH level is between 6 and 7. Therefore, no ammonia needs to be added to the quench water. However, once there are fluctuations in the operation of the unit, S02 and S from the Claus off-gases enter, causing the quench water to become acidic.
Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is hardly soluble in the slightly acidic quench water, whose pH is between 6 and 7, so no ammonia needs to be added to the quench water. However, once there are fluctuations in the operation of the unit, S02 and S from the Claus off-gases enter, causing the quench water to become acidic.
Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is hardly soluble in the slightly acidic quench water, whose pH is between 6 and 7, so no ammonia needs to be added to the quench water. However, if there are fluctuations in the operation of the device, the levels of S02 and S in the Claus off-gases increase. In addition, hydrogen reduction is incomplete within the exhaust gas purification reactor, resulting in a certain amount of S02 in the off-gases that enter the quench tower. S02 is highly soluble in water and has strong acidity, which causes the pH value of the quench water to drop. This exacerbates the corrosion of the packing and the tower structure in the quench tower. At such times, ammonia should be added to the quench water, or deoxygenated water should be used to replace it, in order to maintain the pH of the quench water between 6 and 7 and thereby reduce corrosion of the equipment and pipelines
Under normal conditions, the S02 content in the exhaust gas entering the quench tower is zero; H2S is hardly soluble in the slightly acidic quench water, whose pH is between 6 and 7, so no ammonia needs to be added to the quench water.