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Several desulfurization methods commonly used in desulfurization towers;

1. Boiler desulfurization tower ammonia desulfurization is a technology to control sulfur dioxide emissions. The dust collector can not only remove sulfur dioxide in flue gas, but also produce high-value-added sulfuric acid ammonia fertilizer products. The boiler dust removal equipment uses ammonia water of a certain concentration (here, 28% is taken as an example) as a desulfurizing agent, and the generated ammonia sulfate slurry is sent to a fertilizer plant processing system. The amount of ammonia water used in ammonia desulfurization is automatically adjusted by a preset pH control valve and measured by a flow meter. Ammonia sulfate crystals are crystallized from a saturated ammonia sulfate slurry in a desulfurization and dust collector to generate suspended particles with a weight ratio of about 35%. These slurries are pumped to the treatment site, after primary and secondary dehydration, and then sent to a fertilizer plant for further dehydration, drying, condensation, and storage. At the same time as the flue gas is desulfurized by the boiler dust removal equipment, the boiler dust collector also generates considerable By-products to achieve certain economic benefits.

2. The flue gas running path of the boiler desulfurization tower: The flue gas passes from the existing electrostatic precipitator and blower through the flue system; it flows through a 100% axial flow booster fan and enters the desulfurization tower. After the flue gas enters the desulfurization tower, it comes into contact with the countercurrent spraying slurry containing the ammonia water slurry, and the SO2 therein is absorbed by the ammonia water slurry. The slurry saturates the gas at the same time, and cools it from the temperature of 135 ℃ at the inlet to 50 ℃. Then the gas passes through the two corrugated demisters on the top of the desulfurization tower. In order to remove (in the smoke) incidental droplets. The gas in the running spray tower leaves the desulfurization tower and passes through the boiler again to reheat the gas and at a temperature of 80 ° C ...

3. Liquid path of the desulfurization tower of the boiler desulfurization tower: The pH value of the slurry in the desulfurization tower is maintained within the range of 5.05.9, which optimizes the removal efficiency of SO2 and the oxidation speed of ammonia sulfite. Ammonia sulfate is very easy to dissolve. Under normal conditions, it can reach a solubility of 40% by weight, and under desulfurization tower operating conditions, the proportion can reach 48.5%. The desulfurization tower is in operation under the condition of containing 3-5% by weight of suspended crystalline particles.

4. The boiler desulfurization tower transfer pump sends the slurry to the first stage dehydration cyclone. The overflow slurry of the cyclone is returned to the desulfurization tower, and the concentrated slurry containing 1317% by weight in the lower part of the cyclone is sent to the cyclone storage tank. A slurry pump sends the concentrated slurry from the storage tank to the second-stage dehydration cyclone in the fertilizer plant for further dehydration treatment. A filtrate returns to the pump to return the dilute liquid from the fertilizer plant to the desulfurization tower. Reactor supply system for boiler desulfurization and dust collector: The ammonia water reagent supply system includes a storage tank and a conveying pump with a storage capacity of 7 days. 28% concentration of ammonia water is sent to the desulfurization tower through the oxidation distributor at the bottom of the desulfurization tower, mixed with oxidizing air and cooling water. A preset pH control valve controls the ammonia flow.


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