How does the desulfurizer work?

With the strengthening of environmental protection law enforcement, the awareness of environmental protection in the sintered brick and tile industry has been greatly enhanced, and many brick and tile enterprises have launched desulfurization and dust removal facilities. At present, the flue gas desulfurization process used in the brick and tile industry is mostly double-alkali desulfurization, and the desulfurization agents are NaOH and lime (calcium hydroxide).

The principle of the double-alkali desulfurization process is to add sodium hydroxide solvent to the clear water tank at one time to make sodium hydroxide desulfurizer (circulating water), and pump it into the desulfurization dust collector for desulfurization. and NaOH, so the products Na2SO3 and Na2SO4 are both dissolved in water.

During the desulfurization process of the desulfurizer, the soot mixed with the flue gas is wetted by the circulating water at the same time and trapped in the circulating water, and the circulating water discharged from the desulfurization dust collector becomes gray water (thin mortar). The flue ash flows together into a sedimentation tank, where it is periodically removed by sedimentation and recycled. The overflow enters the reaction tank and reacts with the added lime (calcium hydroxide), the replaced sodium hydroxide is dissolved in the circulating water, and insoluble deposits such as calcium sulfite, calcium sulfate, and calcium carbonate are produced at the same time, which can be removed by precipitation.

1. Dual-alkali flue gas desulfurization is a chemical reaction that must be neutralized with sufficient alkali. The products of NaOH (sodium hydroxide), so (sulfur dioxide) and so (sulfur trioxide) in the double alkali method, such as Na2SO3 (sodium sulfite) and Na2SO4 (sodium sulfate), are soluble in water and cannot be separated from lye. Regeneration of CaSO3 (calcium sulfite) requires lime water as a desulfurizer (calcium hydroxide solution).

2. The pH value of the desulfurizer in the desulfurization tower is not as large as possible.

3. Sodium hydroxide desulfurizer, chemical formula is NaOH, commonly known as caustic soda, caustic soda, caustic soda. It is a strong caustic soda, usually in flakes or lumps. It dissolves easily in water (it gives off heat when dissolved in water) and forms an alkaline solution. In addition, it is easily deliquescent and easily absorbs water vapor (deliquescence) and carbon dioxide (deterioration) in the air. Hydrochloric acid can be added to check for deterioration.

4. Pure industrial solid NaOH desulfurizer is colorless and transparent crystal, shiny, allowing microstrip color. Density 2.130 g/cm3. Melting point 318.4. Boiling point is 1390. Industrial products contain a small amount of sodium chloride and sodium carbonate, which are white opaque crystals. There are content indicators, which can be divided into excellent grades, first-level grades and qualified grades according to different content. There are blocks, flakes, granules and rods. The relative molecular mass is 39.997.

5. Industrial liquid NaOH desulfurizer, clear or slightly turbid, colorless or slightly pink, with content indicators, which can be divided into excellent grade, first grade, and qualified according to different contents.

6. When signing the purchase contract of desulfurizers such as flaky caustic soda (solid sodium hydroxide) or liquid sodium hydroxide and lime, pay attention to the content indicators of sodium hydroxide and calcium hydroxide.

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