An open double-alkali desulfurization gypsum automatic oxidation system and its control method

Abstract

The invention discloses an automatic open-type double-alkali-method desulphurized gypsum oxidation system and a control method thereof. The automatic open-type double-alkali-method desulphurized gypsum oxidation system comprises an oxidation tank, an air conveying system and a PLC (programmable logic controller) control system, wherein the PLC control system is respectively connected with a temperature control system, a pH control system, a slag discharging system and the air conveying system through a conducting wire, the temperature control system comprises a temperature sensor and a steam device, the pH control system comprises a pH sensor and a charging system, and the slag discharging system comprises a density instrument sensor, a slag pushing system and a slag extracting system. The temperature control system, the pH control system, the slag discharging system and the air conveying system are controlled by the PLC control system to form the automatic oxidation system. According to the invention, the content of gypsum in desulphurized slag can be increased, the full sulfur content reaches 15 to 20 percent through monitoring after in-situ application, the content of sulfur trioxide can be increased to 35 to 40 percent, the content of gypsum reaches more than 85 percent after dehydration and gypsum can be recycled so as to avoid secondary pollution.

Description

technical field [0001] The invention belongs to the field of double-alkali flue gas desulfurization and oxidation, and in particular relates to an open automatic oxidation system for double-alkali desulfurization gypsum and a control method thereof. Background technique [0002] At present, the common desulfurization technology is double-alkali flue gas desulfurization. The double-alkali flue gas desulfurization technology uses sodium hydroxide solution as the starting desulfurization agent, and the prepared sodium hydroxide solution is directly injected into the desulfurization tower to wash and remove SO2 in the flue gas. To achieve the purpose of flue gas desulfurization, and then the desulfurization product is reduced to sodium hydroxide in the desulfurization agent regeneration tank, and then returned to the desulfurization tower for recycling. [0003] In the prior art, the commonly used oxidation system is only equipped with an oxidation aeration air duct, and only su...

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Problems solved by technology

The invention uses the first-level branch pipe and the second-level branch pipe as well as the aerator and the straight blade agitator to feed a sufficient amount of oxidizing air to improve the oxidation effect, but the invention requires staff to observe the oxidation situation on site during the oxidation process The correct judgment is made by experience; it is difficult to control the degree of oxidation by manual control, which leads to a reduction in the utilization rate of the oxidation pool; and this invention only considers the oxidation rate from the aspect of oxidizing the air, and the oxidation efficiency of gypsum only reaches 75%.

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