Microwave crystal oscillator drying device for zero emission of desulfurization wastewater

Abstract

The invention relates to a microwave crystal oscillator drying device for zero emission of desulfurization wastewater. According to the microwave crystal oscillator drying device, a spray end of a rotary spray head faces downwards and extends into a drying cylinder, a liquid inlet end is communicated with a crystal slurry solution, an air inlet end is communicated with one end of a heat exchanger,and the other end of the heat exchanger is provided with an air suction inlet communicated with the heat exchanger; the drying cylinder is vertically arranged, a spiral guide groove is formed in theinner wall of the drying cylinder from top to bottom, and a finished product discharging port is formed in the bottom of the drying cylinder; a magnetron device for emitting microwaves to the center is arranged around the drying cylinder, a vertical nested vibrating screen pipe corresponding to the magnetron device is arranged in the center of the drying cylinder, the outer ring of the nested vibrating screen pipe is a microwave scattering surface with a breathable film clamped inside, the inner ring of the nested vibrating screen pipe is a crystal oscillator element, and an air interlayer isreserved between the outer ring and the inner ring; the nested vibrating screen pipe extends out of the drying cylinder and is connected with a fan, air is exhausted outwards through an air exhaust pipeline, the air exhaust pipeline penetrates through a heat exchanger, and air sucked in through an air suction inlet is heated through the heat exchanger.

Description

technical field [0001] The invention relates to a drying device for zero discharge of desulfurization wastewater, in particular to a microwave crystal oscillator drying device for zero discharge of desulfurization wastewater. Background technique [0002] Limestone / lime-gypsum desulfurization is a widely used desulfurization method with high efficiency, reliability, stability, safety and low operating cost. It has long been the most important method for flue gas desulfurization of thermal power coal-fired boilers. However, this method has a large wastewater treatment problem. Wastewater produced by desulfurization contains a large amount of chloride ions, sulfate radicals, calcium, magnesium and other ions. The water quality of the wastewater is complex, mainly containing suspended solids, sulfates, supersaturated sulfites, and heavy metals. Many of them are strict in the national environmental protection standards. The first category of pollutants required to be controlled...

AI Technical Summary

Problems solved by technology

For the evaporation and crystallization stage, various devices are used to obtain the crystal slurry solution, which is generally a saturated suspension liquid with a water content of 20%-40%. The conventional idea is to use a mechanical centrifugal dehydrator + circulating fluidized bed drying machine, which can meet the production requirements, but the disadvantage is that the energy utilization rate is not high through the conversion of electric energy into heat energy, and the energy utilization rate is not high, and there are too many equipment in operation, the equipment is huge, and the drying cost is high; The vaporizer completely evaporates the waste water in the tower through the flue gas, which reduces the number of equipment and reduces the one-time investment. However, due to the use of

The demand for flue gas is too large, the drying volume becomes larger, the volumetric heat transfer coefficient is low, and the dust in the flue gas will cause secondary pollution to the crystal slurry components, resulting in a decrease in the purity of industrial salt

Directly affect the sale and cannot be transformed into reasonable economic benefits

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