Device and method for enhancing quality of ammonia-process desulfurization coproduct ammonium sulfate

Abstract

The invention discloses a device and method for enhancing quality of an ammonia-process desulfurization coproduct ammonium sulfate. The device comprises a desulfurizing tower and an ammonium sulfate crystallizing system, wherein a preconcentration spray layer is arranged in the desulfurizing tower; a concentrated solution circulating pipeline which leads to the inside of the preconcentration spray layer is arranged on the bottom of the desulfurizing tower; an oxidation circulation groove connected with an absorption solution spray layer is arranged outside the desulfurizing tower; the bottom of the oxidation circulation groove communicates with the bottom of the desulfurizing tower; the desulfurizing tower is provided with an overflow pipe which leads to the inside of the oxidation circulation groove; a liquid purification groove which leads to the inside of the bottom of the desulfurizing tower is also arranged outside the desulfurizing tower; the liquid purification groove is sequentially connected with a liquid filter and an ammonium sulfate storage tank through a pipeline; the ammonium sulfate storage tank is connected with the crystallizing system; the crystallizing system comprises a crystallizer, a compressor and a heat exchanger; the heat exchanger is provided with a liquid inlet, a liquid outlet, a condensation water outlet and a steam inlet; the top of the crystallizer is provided with a steam outlet; and a discharge port of the crystallizer is sequentially connected with a centrifuge and a dryer.

Description

technical field [0001] The invention relates to a technology for removing sulfur dioxide in flue gas, in particular to a device and method for improving the quality of ammonium sulfate by-product of ammonia desulfurization, which belongs to the field of environmental protection technology. Background technique [0002] With the continuous development of the country's industrial economy, the demand for oil and coal power industries has increased, and the extensive economic development has also brought certain environmental problems, one of which is air pollution. Due to the increasing awareness of environmental protection of national leaders and the people in recent years, the country has vigorously advocated green economy and circular economy, and successively formulated strict environmental protection policies. Strict control of sulfur dioxide content in flue gas emitted by various industries has become a top priority in air pollution control. [0003] At present, many lar...

AI Technical Summary

Problems solved by technology

But at this stage, because the reaction product ammonium sulfate solution contains soot, oil, heavy metal ions, etc. that are carried by the flue gas entering the tower, these usually come from the waste flue gas generated by the calcination process and coking process, resulting in the quality of the final ammonium sulfate product (color , particle size, purity) are poor, unable to meet product sales standards

In addition, the crystallization system commonly used at this stage cannot meet the requirements for the production of high-quality by-product ammonium sulfate due to the performance limitations of the device itself, and the utilization rate cannot be further improved

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