Method for circularly processing hot boiler flue gas and desulfurization wastewater

Abstract

The invention discloses a method for circularly processing hot boiler flue gas and desulfurization wastewater and a device for circularly processing the hot boiler flue gas and the desulfurization wastewater. The method comprises the following steps of: 1) storing the desulfurization wastewater in a sedimentation basin; 2) feeding the hot glue gas into an electrostatic precipitator, and introducing the desulfurization wastewater into an atomizing spray gun; 3) introducing air into the atomizing spray gun, mixing the air and the desulfurization wastewater in the atomizing spray gun, thereby obtaining wastewater foam flow; 4) injecting the wastewater foam flow into the desulfurization wastewater, and obtaining cooled flue gas with desulfurization wastewater precipitates; 5) feeding the cooled flue gas into an adsorption tower for the desulfuration treatment; 6) changing the cooled flue gas into desulfurized purified gas, and feeding the wastewater, namely the desulfurized wastewater generated in the desulfurizing process, into the sedimentation basin; and 7) obtaining a continuous recycling process of using the hot boiler glue gas to evaporate the desulfurized wastewater and using the desulfurized wastewater to cool and dedust the hot boiler glue gas. The method for circularly processing the hot boiler flue gas and the desulfurization wastewater and the device for circularly processing the hot boiler flue gas and the desulfurization wastewater can be used for improving the treatment rate of wastewater and wastewater reuse rate, improving the dedusting efficiency, reducing the waste gas discharge, and reducing the desulfuration treatment cost.

Description

technical field [0001] The invention relates to the treatment of desulfurization wastewater, in particular to a method and device for circulating boiler hot flue gas and desulfurization wastewater, which is suitable for treating wet flue gas desulfurization wastewater. It belongs to the technical field of sewage treatment. Background technique [0002] The main emissions from boiler combustion are sulfur dioxide and dust, among which sulfur dioxide is one of the main pollutants that cause acid rain. At present, the pollution of sulfur dioxide is mainly controlled by wet flue gas desulfurization technology, but wet flue gas desulfurization technology will produce a large amount of wastewater during the desulfurization process, but the wastewater contains a large amount of impurities such as suspended solids and supersaturated sulfite , sulfate and heavy metals, many of which are the first category of pollutants that require strict control in the national environmental protec...

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Problems solved by technology

This method causes the concentration of chlorine in the flue gas to exceed the specified value, and a certain amount of waste water must be discharged from it. Although the waste water is subjected to gypsum dehydration and cleaning systems, it cannot remove the salt in the desulfurization waste water. Because the salt content in the desulfurization waste water is too high, it is difficult to Recycling is used in production or life. In most cases, it can only be discharged outside, so it has a certain impact on the water environment, and the boiler flue gas directly passes through the dust collector. Due to the influence of the flue gas, the dust in the flue gas cannot be well collected. dust collector absorption

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