Smoke desulfurization and denitrification integration method and special device thereof

Abstract

The invention discloses a smoke desulfurization and denitrification integration method and a special device thereof. The method is characterized in that a wet-method process is used in one technological system to simultaneously remove sulfur dioxide and nitrogen oxide in the smoke; an ammonium method is used for desulfurization, ammonia water is also used as a desulfurizer of the sulfur dioxide and a neutralizing agent for byproduct nitric acid produced in the denitrification process; an oxidization reduction method is used for the denitrification, a desulfurization byproduct ammonium sulfite or ammonium bisulfite is used as a reducing agent, urea is used as a reducing agent, a quinine-contained hydroxyl compound is used as a catalyst, air is blown into the denitrification circulating liquid so as to provide the dissolving oxygen and the oxidant for the oxidization reaction of the nitrogen oxide; a byproduct ammonium nitrate of the denitrification reaction is placed into the desulfurization liquid so as to recycle the nitrogen ammonium; and ammonia nitrogen chemical fertilizer ammonium sulfate and ammonium nitrate are recycled, and the entire technological flow is free from discharging sulfur-contained or ammonia nitrogen-contained waste liquid out of the system. Due to the adoption of the method, the integration of the desulfurization and the denitrification can be realized, the device is miniaturized, and no waste liquid is discharged in the technological process.

Description

technical field [0001] The invention relates to the field of desulfurization and denitrification treatment of flue gas generated by combustion of coal-fired and oil-fired boilers, and catalytic cracking regeneration flue gas of oil refineries, the field of sulfuric acid tail gas treatment of sulfuric acid production, and the treatment of tail gas of chemical fertilizer production, etc. containing sulfur dioxide and nitrogen oxides. Part of the waste gas treatment field. Specifically, it relates to an integrated method for flue gas desulfurization and denitrification and a special device thereof. Background technique [0002] With the rapid development of my country's economy, the increase of industrial pollution sources and the corresponding environmental protection regulations are becoming more and more stringent. At the same time, it has promoted the progress of environmental governance technology and produced a large number of environmental pollution source governance te...

AI Technical Summary

Problems solved by technology

[0017] Based on the above various denitration technologies, except that the dry denitrification technology has achieved large-scale industrialization, the liquid phase denitrification technology is not yet widely used. The main reason is that the denitrification efficiency is not as high as the dry SCR method, and the single function is limited to denitrification.

Moreover, the price of absorbents such as oxidizing agents and reducing agents used is relatively expensive, and the concentration of the products in the solution is low and difficult to recover, leaving them in the solution will cause secondary pollution to the environmental water quality.

However, the construction cost of the wet liquid phase denitrification process device is relatively low, the operating cost is also lower than that of the dry method, and the operating conditions are relatively loose

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