Acid Production System
We recommendthe combination of ionic liquid desulfurization and industrial sulfuric acid process to treat the lead smelting flue gas to meet the standard emission and produce industrial sulfuric acid.
Side-blownfurnace flue gas purification: adopt adiabatic evaporation dilute acid cooling process, side-blownfurnace flue gas purification into the automatic gas separation system to automatically adjust the amount of gas to be divided, 50% of the flue gas into the composite amine SO2capture desulfurization system, 50% of the flue gas into one-turn one-suction acid production system
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Introduction of Main System
Flue gas purifying system
The flue gas from the side-blown furnace electric dust collector, enters the high efficiency scrubber, contact with the spray liquid to cool down, remove most of the mineral dust and other impurities, enter the packed scrubber tower, the packed scrubber tower to spray liquid scrubbing further dust removal, the temperature is reduced again, the flue gas after the second scrubbing into the automatic gas separation system, 50% of the flue gas into the composite amine SO2capture desulfurization system, 50% of the flue gas into the flue gas cooling tower, cooling tower to spray liquid scrubbing further dust removal to cool down, then into the two-stage electric mist eliminator to remove acid mist and other impurities before entering the next step of dry suction section.
Dry suction process
The flue gas from the flue gas purification system of the side-blown furnace and the pure SO2from the SO2capture desulfurization system of the compound amine are mixed into the drying tower, sprayed with 93% sulfuric acid to dry the water down to 0.1g/Nm3, and then into the SO2blower of the conversion section. After absorbing the water, the sulfuric acid flows into the circulation tank, and the concentration is maintained by the 98% sulfuric acid flowing from the absorption tower circulation system, which is sent to the acid cooler of the drying tower by the circulating acid pump, and then cooled down and sprayed into the drying tower. The increased 93% sulfuric acid flows into the absorption tower circulation tank.
The primary conversion gas from the conversion section enters the absorption tower, and the sulfuric acid flows into the circulation tank after absorbing the increased concentration of SO3. The 93% sulphuric acid that flows into the circulation system of the drying tower is added with water to maintain its concentration and sent to the acid cooler of the absorption tower through the circulating acid pump to cool down and then to the absorption tower spray. Part of the additional 98% sulfuric acid is sent to the drying tower recirculation tank and part of it is sent to the acid storage tank as finished acid.
The primary conversion gas is absorbed by SO3in the absorption tower and sent to the compound amine SO2capture desulfurization system after removing acid mist and acid foam by the fiber mist eliminator at the top of the tower.
Converting Process
The flue gas with SO2 concentration of about 5.5% from the drying tower of the dry suction section is boosted by the SO2blower, heat exchanged by the third heat exchanger, the second heat exchanger and the first heat exchanger shell side and tube side SO3gas, and is heated by the electric heating furnace, and the temperature is raised to 420~430℃ before entering the converter for the first conversion.
After three stages of catalyst reaction, the conversion rate is 95%; the primary conversion gas is cooled down by heat exchange and then put into the dry absorption section absorption tower for absorption. The gas heat exchange equipment is scaled tube high efficiency heat exchanger.
In order to regulate the inlet temperature of the catalyst layer in each section, necessary sub-lines and valves are set. For the converter start-up heating, an electric heating furnace is set up at the inlet of the conversion section. After this conversion process (high quality vanadium catalyst must be used), the conversion rate can be stabilized at 95% for a long time, and the SO2concentration in the exhaust gas is around 0.27%
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