Limestone desulfurization system slurry desalination system and desalination method

Abstract

The invention provides a limestone desulfurization system slurry desalination system and a desalination method. The system comprises a solid-liquid separation box, a liquid phase outlet of the solid-liquid separation box is connected with a desalination buffer box through a pipeline, the desalination buffer box is connected with a six-channel electrodialysis device through a circulating pump, andthe desalination buffer box is connected with a desulfurization system through a pipeline; wherein the six-channel electrodialysis device is respectively connected with a sodium chloride buffer tank,a chlorine salt concentrated water circulating tank and a sodium salt concentrated water circulating tank through pipelines, and the sodium chloride buffer tank is respectively connected with a sodiumchloride solution inlet pipeline and a sodium chloride solution outlet pipeline; wherein the chlorine salt concentrated water circulating tank is connected with a chlorine salt concentrated water discharge pipeline, and the sodium salt concentrated water circulating tank is connected with a sodium salt concentrated water discharge pipeline. According to the invention, replacement separation and high-rate concentration of high-scaling-risk salt components in the desulfurization slurry are realized, the pollutant discharge amount of a desulfurization system is reduced to the maximum extent, andthe operation reliability and economy of the desulfurization system are improved.

Description

Technical field: [0001] The invention relates to a limestone desulfurization system slurry desalination system and a desalination method, belonging to the technical field of desalination treatment. Background technique: [0002] Coal-fired power plants generally use limestone-gypsum wet flue gas desulfurization technology to remove sulfur dioxide in flue gas, and use limestone to react with sulfur dioxide and oxygen to form gypsum during the contact process between lime slurry and flue gas to achieve sulfur dioxide removal in flue gas. With the increase of the number of cycles, the concentration of soluble substances such as chloride ions and magnesium ions in the lime slurry will continue to increase, which will easily lead to problems such as slurry foaming and limestone shielding, resulting in difficulties in the operation of the desulfurization system. To ensure the safe and stable operation of the desulfurization system At present, the concentration of chloride and magn...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a limestone desulfurization system slurry desalination system and desalination method for the above existing problems, to remove the salt in the desulfurization slurry, to solve the system operation problem caused by the continuous increase of the salt content in the desulfurization slurry operation process, Using low-cost and easy-to-obtain sodium chloride as the raw material, the replacement, separation and high-rate concentration of the high-scaling risk salt components in the desulfurization slurry can be realized, the pollutant discharge of the desulfurization system can be minimized, and the operation reliability and economy of the desulfurization system can be improved.

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