Our factory is currently roasting sulfur; what are the main reasons for the excessive exhaust gas?
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Our plant has a capacity of 100,000 tons. We currently use a bubbling furnace for sulfur calcination. At present, the amount of exhaust gas is high; the acid concentration is basically normal, the moisture level is normal as well, and the acid mist level is normal – with moisture below 0.1 and acid mist below 0.0028. Are there any other possible reasons?
Acid temperature? What’s the concentration? Is there also an absorption rate?
I analyze the reasons as follows: 1 Is the amount of salicylic acid insufficient? 2: Uneven acid distribution. 3 Is the operating voltage of the electrostatic demister normal? 4 Too high inlet tower temperatures for the first and second suction stages can also have an impact. 5 The acid concentration is not well controlled.
Main reasons: 1 Insufficient amount of sulfonic acid or uneven distribution of the acid; 2 High temperature of the acid entering the tower; 3 Unstable acid concentration.
There’s a chance to check whether the pipeline of the two-stage acid separator is leaking, and whether it is a tubular acid separator What type of demister is it, and how many years has it been in use?
Drying acid temperature: 45-55 degrees; first absorption at 50-60, second absorption at 45-60. Electric fog is normal. Acid concentration: 92.5-93.5 for the dry stage, around 98.7 for the first and second absorption stages
It is a tubular electrostatic fog acid separator; the acid separation part is tubular
What is the conversion rate per attempt? Is it “3+1” or “3+2”?
Maintaining the acid absorption concentration between 98.3% and 98.5% requires stability; moreover, the acid temperature must not exceed 80 degrees nor fall below 70 degrees
Heavy smoke from exhaust: Causes: 1. The acid concentration being too high or too low; 2. Corrosion of the impeller in the 98% acid pump, resulting in a low amount of acid supplied； 3. The drying acid is too dilute ； 4. Uneven acid distribution or channeling in the packing inside the absorption tower ； 5. Low acid volume in the drying acid pump ； 6. Excessively high inlet temperature of the second absorption tower
The possible reasons have all been mentioned above; it’s necessary to test the exhaust gases in order to address the issue accordingly
Analyze the absorption rates, as well as sulfur dioxide and sulfur trioxide in the exhaust gases. Check the difference from the normal value, and then analyze the reasons.
Smoking when the moisture level is within the specified range has nothing to do with drying; it is mainly a problem related to the absorption rate. In addition to the points mentioned above, it is possible to keep the temperature difference between the acid used for absorption and the temperature of the incoming gas at around 110 degrees.
Adding to the above: Absorbing acid at too high or too low a temperature can also affect the absorption of sulfur trioxide. Slightly increase the temperature of the air entering the tower to see if acid mist is being formed due to it being below the dew point temperature, which is causing the exhaust fumes to smoke.