Step-by-step oxidation multi-stage fluidized flue gas purification apparatus and method

Abstract

The invention discloses step-by-step oxidation multi-stage fluidized flue gas purification apparatus and method. The apparatus comprises a step-by-step oxidation module and a multi-stage fluidized beddevice; the step-by-step oxidation module is connected with the multi-stage fluidized bed device through conveying pipes; and each conveying pipe is provided with a throttle valve. According to the apparatus, a method of connecting the step-by-step oxidation device and the multi-stage fluidization device in series is adopted, so that the mixing problem of an oxidant with flue gas is solved, and the problem that after the oxidant is injected, the front-stage oxidant of gas is excessive and the rear-stage oxidant is insufficient is solved. The injection amount of the oxidant in the step-by-stepoxidation part of the device can be gradually reduced along with the gradually reduced load of pollutants, so that the waste phenomenon caused by uneven mixing of the oxidant and the flue gas can beavoided. According to the fluidization state of an adsorbent in the multi-stage fluidized bed device, parameters such as the air quantity, the use amount and particle size of the adsorbent, and the like of each stage can be changed according to the character of gradually reduced load of pollutants, so that best treatment efficiency can be achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a step-by-step oxidation multi-stage fluidization flue gas purification device and method. Background technique [0002] Coal accounts for more than 70% of my country's energy consumption structure. The flue gas of coal-fired power plants contains pollutants such as sulfur dioxide (SO2), nitrogen monoxide (NO) and mercury (Hg). pollutants into the atmosphere, causing environmental problems such as acid rain and photochemical smog. [0003] Generally, the methods for purifying flue gas of coal-fired power plant boilers include: absorption method, such as chloric acid / sodium chlorate oxidation method or complex absorption; adsorption method, using activated carbon, activated coke and other carbon-based materials for adsorption or metal oxide catalytic adsorption ; Advanced oxidation methods, such as electron beam irradiation technology and plasma discharge...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a flue gas purification device and method of multi-stage fluidization for step-by-step oxidation, so as to solve the problem that the current oxidant proposed in the above background technology cannot fully mix and react with the pollutants in the flue gas, and the ideal oxidation cannot be achieved. The effect will affect the subsequent adsorption, resulting in a decrease in the removal rate of pollutants in the flue gas, and the poor fluidization state of the adsorbent in the adsorption tower, resulting in the inability to fully realize the adsorption effect of the adsorbent. At the same time, the unstable fluidization state of the system will also lead to adsorption The problem that the agent escapes with the flue gas

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