Method and equipment for flue gas desulfurization and denitrification by using active coke supported metal oxide

Abstract

The invention discloses a method for flue gas desulfurization and denitrification by using an active coke supported metal oxide. The method comprises the following steps: S1, spraying a nitric acid metal compound solution; S2, conveying active coke to be in contact with the nitric acid metal compound solution; S3, treating the active coke in contact with the nitric acid metal compound at a preset temperature to realize the loading of the metal oxide by the active coke; S4, shunting the active coke loaded with the metal oxide to form first active coke and second active coke; S5, enabling the first active coke to be in contact with flue gas to remove sulfur oxides from the flue gas so as to form desulfurized flue gas; and S6, mixing the desulfurized flue gas with pre-input ammonia gas, and contacting with the second active coke to remove nitrogen oxides from the desulfurized flue gas to form desulfurized and denitrified flue gas. According to the method, the flue gas can be effectively purified, and no pollutant is generated.

Description

technical field [0001] The technical field of dry desulfurization and denitrification of the present invention is specifically a method and equipment for desulfurization and denitration of flue gas by carrying metal oxides on activated coke. Background technique [0002] With the enhancement of people's awareness of environmental protection, and the increasingly stringent national environmental protection regulations and policies, many enterprises that produce polluting gases in the production process will perform desulfurization and denitrification treatment on their flue gas to meet the needs of environmental protection. [0003] At present, there are three commonly used desulfurization methods, wet desulfurization, semi-dry desulfurization and dry desulfurization. Among them, wet desulfurization and semi-dry desulfurization need to consume a large amount of water resources, generate a large amount of wastewater, and greatly increase the water content of flue gas, which wi...

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Problems solved by technology

The above two methods have the following problems in industrial application: ①Activated coke needs to undergo high-temperature activation treatment (above 1000°C) during the molding process. At this temperature, active coke with strong reducibility is prone to redox reactions with metal oxides , reduce the price of metal oxides, and then sublimate low-priced metal oxides, it is difficult to obtain metal oxides / activated coke products of a given quality

②Using activated coke to impregnate the metal solution in a circular manner will cause the metal solution to become acidic, and eventually produce waste water that is difficult to recycle and purify, which is contrary to the purpose of the dry desulfurization technology

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