Combined removal method for contaminants from coal-fired flue gas and special purification reactor thereof

Abstract

The invention discloses a combined removal method for contaminants from a coal-fired flue gas and a special purification reactor thereof. The method comprises the following steps: (1) the flue gas to which dust removal is conducted at the tail part of a coal-fired boiler is cooled down by a heat exchanger; (2) the cooled flue gas passes through a primary purification reactor and a secondary purification reactor successively; (3) the flue gas discharged by step 2 is heated up by the heat exchanger and then discharged into atmosphere; (4) online monitoring is conducted to the flue gas discharged by step 3; when the emission concentration of the contaminants is higher than the emission standard, step 5 is conducted; otherwise, step 1 to step 3 are conducted circularly; (5) water is sprayed into the primary purification reactor and the secondary purification reactor to repeatedly wash the removal product attached to the surface of activated carbon fiber; and (6) air is heated up and then input into the primary purification reactor and the secondary purification reactor which are washed with water in step 5 so as to dry the activated carbon fiber in the reactors and then step 1 is conducted. The invention has the advantages of high removal rate for a plurality of contaminants, simple technique flow, integrated removal device, recyclable byproducts and the like.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection, and relates to a method for simultaneously removing various pollutants in coal-fired flue gas, including sulfur oxides, nitrogen oxides, trace highly toxic element mercury and its compounds, and volatile organic pollutants. The special-purpose purification reactor particularly relates to a waste gas purification method using activated carbon fiber as an adsorption material. Background technique

[0002] In addition to producing a large amount of sulfur oxides (SOx) and nitrogen oxides (NOx), coal combustion also releases mercury and organic pollutants, which have caused great harm to the atmospheric environment and human health; especially mercury emissions, due to toxicity Large and extremely volatile and difficult to control, it has become an important environmental problem in our country.

[0003] In recent years, my country has independently developed and introduced many pol...

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