Multi-zone oxidizing process and device for ammonia process of desulfurization of smoke

Abstract

The invention discloses a multi-zone oxidizing process and device for an ammonia process of desulfurization of smoke. The device comprises a desulfurizing tower and multi-zone oxidizing tanks; smoke successively passes through a concentration cooling section, an absorption section, a washing section and a dehydrating and demisting section to become pure smoke to be discharged; ammonium sulfate spraying slurry is arranged in the concentration cooling section; an ammonium sulfite and ammonium sulfate spraying solution is arranged in the adsorption section; spraying water is arranged in the washing section; a demister is arranged in the dehydrating and demisting section; after the adsorption liquid discharged from the absorption section is mixed with ammonia water, the mixture successively passes through an imine regenerating region and a sulfite oxidizing region in the multi-zone oxidizing tanks; a part of the generated ammonium sulfite is circularly sprayed in the absorption section through an absorption pump while the other part while the other part is discharged into the sulfite oxidizing region to be oxidized; a part of generated ammonium sulfate is circularly sprayed in the absorption section through an ammonium sulfate pump while the other part is discharged into the concentration cooling section. The device is scientific in design, compact in structure, high in oxidizing efficiency, water-saving, material-saving, land-saving, energy-saving, good in demisting effect, ultra-low in emission and stable in performance, and has very high practicality and wide applicability.

Description

technical field [0001] The invention relates to a flue gas desulfurization process and device, in particular to a flue gas ammonia desulfurization multi-zone oxidation process and device. Background technique [0002] As air pollution becomes more and more serious, the country's environmental governance standards are increasing day by day. At present, the intensity of atmospheric governance has been continuously increased and the results have been remarkable. However, the process of aerosol governance is relatively lagging behind and gradually attracts people's attention. [0003] Ammonia desulfurization uses absorption liquid to react with flue gas, which is currently a better method for absorbing and utilizing sulfur dioxide in flue gas. However, the by-product of the desulfurization process of ammonia desulfurization equipment is mainly ammonium sulfite, and ammonium sulfite is unstable. Decomposition can easily cause secondary pollution. Setting up an oxidation device fo...

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Problems solved by technology

[0002] As air pollution becomes more and more serious, the country's environmental governance standards are increasing day by day. At present, the intensity of atmospheric governance is constantly increasing and the results are remarkable. However, the process of aerosol governance is relatively lagging behind and gradually attracts people's attention.

[0003] Ammonia desulfurization uses absorption liquid to react with flue gas, which is currently a better method for absorbing and utilizing sulfur dioxide in flue gas. However, the by-product of the desulfurization process of ammonia desulfurization equipment is mainly ammonium sulfite, and ammonium sulfite is unstable. Decomposition can easily cause secondary pollution. Setting up an oxidation device for ammonia desulfurization to further oxidize ammonium is not only the need for fixing sulfur dioxide, but also the requirement for the economy of ammonia desulfurization. At the same time, it is difficult to construct the reconstruction project and the land is tight

An integrated high-efficiency desulfurization and oxidation desulfurization process device is urgently needed to solve the current situation that most of the existing technologies are ammonia addition at the pump inlet, poor mixing uniformity, and poor oxidation effect of the oxidation tank, and reduce the generation of aerosols from the source

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