Is there a large amount of acidic sludge under the heat exchanger?
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We use a 3+1 process. The inlet and outlet temperatures in sections 1 and 2 are normal; the inlet temperature in section 3 is low, while the inlet temperature in section 4 is normal. . During the production process, the gas concentration is very low and the acid concentration is well controlled, yet a large amount of smoke still emerges from the chimney; the reason for this cannot be identified. During the maintenance, all heat exchangers were inspected, and it was found that there was a large amount of acidic sludge in a liquid state at the bottom of the heat exchangers coming out of Section 3 and passing through IIIB and IIIa; such a phenomenon had never occurred before. How should this phenomenon be explained? What is the cause, and how should it be handled? This post was last edited by Peach blossoms are in bloom on 2009-3-25 20:21.]
There is a leak at 3B; water reacts with the flue gas that comes out of the absorber (containing sulfur dioxide and sulfur trioxide), resulting in the formation of large amounts of acidic sludge. The leak can be sealed up. From the absorber to 3B, the temperature drops, and acidic sludge can form even when there is no leak, so it is necessary to remove this sludge regularly. The frequency and duration of such cleaning operations depend on the amount of sludge generated.
Condensate acid needs to be drained regularly; perhaps the fiber demister in one absorption tower is damaged.
The reasons could be as follows: 1. The moisture level is poor, resulting in the formation of dilute acid inside the three tube exchanges. 2. The drying tower contains acid; once the three exchange tubes are punctured, the acid enters these tubes and flows to the bottom plate of the three-exchange unit. This can be determined by checking the rotation count and the total number of rotations. 3. Check whether the gas temperature flowing from the third exchanger to the absorption tower is too low; if it is close to the dew point of 130 degrees, condensate acid may form and flow into the bottom of the third exchanger. That’s about it; check the reasons!
The dew point is low, resulting in the formation of condensation acid; this indicates a low temperature, which in turn leads to a low absorption rate during the first absorption stage. As a result, large amounts of acid mist enter the second absorption tower, preventing the absorption rate from reaching 99.95%