A method for dedusting, desulfurizing and denitrating boiler flue gas and removing dioxins

Abstract

The invention discloses a method for dedusting, desulfurization, denitration and dioxin removal of boiler flue gas. The method comprises the following steps: extracting flue gas having a temperature of 250-350 DEG C from a boiler, injecting bicarbonate with a size of 600-700 meshes into the flue gas, and carrying out a reaction; and adding a reducing agent into the reacted flue gas, and allowing the flue gas to enter a denitration-dedusting composite device for denitration, dioxin removal and dust removal. The denitration-dedusting composite device comprises a shell, a partition plate and a plurality of basalt fiber filter cartridges, wherein the partition plate is arranged on a cross section of the shell and divides the shell into a first chamber and a second chamber; the sidewall of the shell of the first chamber is provided with a flue gas inlet; the sidewall of the shell of the second chamber is provided with a flue gas outlet; each basalt fiber filter cartridge is a hollow tube body, and basalt fiber cotton is bonded with a catalyst; each basalt fiber filter cartridge is mounted on the partition plate, and the basalt fiber filter cartridges are all located in the first chamber; and the opening of each basalt fiber filter cartridge is in communication with the second chamber.

Description

technical field [0001] The invention belongs to the technical field of flue gas dust removal, desulfurization and denitrification, and in particular relates to a method for boiler flue gas dust removal, desulfurization and denitrification and dioxin removal. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] my country is a large agricultural country with abundant biomass raw materials, which can be used in large quantities in the power generation industry; the nitrogen and sulfur oxide emissions in the flue gas are large, but the treatment is not enough, causing serious ecological problems. Therefore, how to deal with nitrogen and sulfur oxides in flue gas and reduce their ...

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Problems solved by technology

However, the inventor found that there are many shortcomings in the bag filter, such as: ①In the daily operation of the bag filter, due to some changes in the operating conditions or some failures, the normal operation and work of the equipment will be affected. poor performance and operational stability; ② cannot adapt to the high temperature, acid-base corrosion environment of biomass power plants; ③ bag filter is prone to combustion, explosion and fire accidents

[0008] In addition, for some flue gases containing a large amount of dioxins, such as garbage boiler flue gas, the removal method of dioxins is generally to use activated carbon adsorption and bag filter, but activated carbon adsorption has the following disadvantages: 1) Activated carbon Expensive injection devices are required, and the removal efficiency is affected by the fluctuation of the feeding work; 2) The activated carbon adsorbs dioxins, but only transfers them to the fly ash, and the total amount does not decrease; 3) The adsorption efficiency of activated carbon is related to the specific surface area of ​​activated carbon and the smoke It is closely related to factors such as the mixing degree of gas, and it is difficult to stabilize and completely control the process; 4) The fly ash contains dioxins, which need to be sent to a hazardous waste treatment plant for reprocessing to prevent dioxins from escaping again; 5) Due to the carbon Existence, increasing the hidden danger of fire naturally occurring in the dust collector; 6) Activated carbon acts as an adsorption rather than decomposition, and the staff is in a dangerous environment

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