Carbide slag desulfurized gypsum production process and device

Abstract

The invention relates to the technical field of flue gas desulfurization, and particularly discloses a carbide slag desulfurized gypsum production process which sequentially comprises the steps of pulping, desulfurizing, sampling and discharging solid, the invention further discloses a carbide slag desulfurized gypsum production device which comprises a pulping system, a desulfurization system anda dehydration system. The method comprises the following steps: collecting gypsum mixed slurry in a reaction tank; obtaining clarification rate thereof, wherein the clarification rate is less than orequal to 25-30%; carrying out timely removal of desulfurization wastewater, so that the content of chloride ions and particle impurities is reduced, and further gypsum crystallization is ensured, gypsum grains are increased, the content of particle impurities is reduced, the probability of blocking a filter device is reduced, the reference basis is provided for improving the quality of the desulfurized gypsum, and the desulfurized gypsum can finally pass through a dehydration device to realize relatively low water content and achieve the purpose of availability.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, and more specifically relates to a production process of calcium carbide slag desulfurization gypsum, and the invention also provides a production device for calcium carbide slag desulfurization gypsum. Background technique [0002] In the process of thermal power generation, since the exhaust gas after combustion contains a large amount of sulfur, direct discharge will cause great damage to the environment, so flue gas desulfurization devices are usually used. In the process of flue gas desulfurization, SO in flue gas 2 Acidic in nature, SO can be removed from flue gas by reacting with appropriate alkaline substances 2 . Carbide slag is the waste of polyvinyl chloride produced by the acetylene process. Its main component is calcium hydroxide, and other impurities include calcium carbide, silicon dioxide, coke, ferrosilicon, sulfide, phosphide, tar, chloride ions, etc. Because...

AI Technical Summary

Problems solved by technology

Part of the solid impurities and the ash in the flue gas continue to accumulate in the absorption tower, and finally enter the vacuum belt filter together with the gypsum, blocking the hydrophobic pores of the gypsum; The gypsum crystal grains are too small, and the gypsum hydrophobic channels are blocked during the dehydration process; the above reasons are the main reasons why the moisture content of the gypsum from the vacuum belt filter cannot be stabilized below 10%.

[0006] In addition, the existing calcium carbide slag pretreatment system is complex in configuration and equipment, occupies a large area, and requires a large investment. It is not suitable for power plants that use raw limestone desulfurization for calcium carbide slag desulfurization.

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