How to deal with environmental inspections?
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Environmental monitoring primarily involves testing the exhaust gases from sulfuric acid production plants in accordance with **emission standards; the key parameters to monitor are SO2 and acid mist. To reduce the level of SO2 in the exhaust gases and ensure that they meet the specified emission limits, the following measures can be taken: 1. Keep the concentration of SO2 entering the conversion process within the designed range； 2. Increase the oxygen-sulfur ratio in the flue gas entering the conversion process ； 3. Appropriately reduce the processing load of the device and increase the residence time of the flue gas undergoing conversion ； 4. During environmental protection testing, increase the reaction temperature of each layer and operate at the upper limit of the specified range to improve the conversion rate of each layer ； 5. Adjust the conversion catalyst before environmental testing; replace it with a highly active catalyst if necessary ； 6. Control the acid concentration in the absorption tower to reduce SO2 introduced into the second absorption tower along with the acid used in drying ； 7. Promptly address internal leaks due to temperature changes during conversion ； It should be noted that single-stage, single-suction pumps are not within the scope of this discussion. This post was last edited by in the blink of an eye on 2007-12-1 09:50]
Technicians should always do more to contribute to environmental protection. It would be better to be able to make a contribution.
Technicians should do more useful work for their country’s environmental protection efforts; it would be even better if they could make contributions.
Another requirement is to inspect the heat and cold exchange conversion unit, and any internal leaks detected must be addressed promptly.
The liquid distribution device, namely the acid distributor, is also very important. The acid separation unit is a key component of the sulfuric acid dry absorption tower, and its performance directly affects the effective wetting area of the packing as well as the absorption efficiency. Old sulfuric acid plants use a cast-iron acid separation claw structure, with 12 acid separation points per m2; they are complex to install, heavy, have many flange connections, and result in uneven acid separation. In actual production, the uneven distribution of acid formation due to a small number of acid separation points, along with poor contact between the gas and the acid, affects the efficiency of gas drying and absorption. As a result, the level of SO2 in the exhaust gases is excessively high, causing the chimneys to often emit white smoke. The tubular acid distributor has a compact structure, provides uniform acid distribution, with a high density of acid distribution points (16–22 per m2). It does not require strict levels of installation, but it is prone to acid splashing and foaming. The acid distribution holes can become clogged by solid impurities in the acid, making them difficult to clean. Changes in the amount of acid distributed have a significant impact on the uniformity of acid distribution. Tubular acid separators have numerous acid distribution branches, with a small spacing between them; as a result, the acid flow rate is high, which generates more acid foam.
1. 30 minutes before testing, reduce the concentration of furnace gas appropriately. 2. The inlet temperature at each layer can be increased slightly. 3. Increase the concentration of the drying acid. 4. Ensure that the exhaust gas treatment equipment is operating properly. However, none of these are solutions to the root of the problem; what’s important is to improve the conversion rate, absorption rate, and sulfur utilization rate in order to address the issue fundamentally.