MCFB fuel gas purifying device capable of jointly removing various pollutants

Abstract

The invention discloses an MCFB fuel gas purifying device capable of jointly removing various pollutants, which comprises a connecting flue, a primary fuel gas uniform distribution device, a secondary fuel gas uniform distribution device, a Venturi, multistage humidification and activation devices, a dust catcher, an ash circulation device, a draught fan, a fluidized bed reactor, a Venturi diffuser and a composite absorbent preparation device, wherein the lower end of the fluidized bed reactor is sequentially connected with the Venturi diffuser, the Venturi, the secondary fuel gas uniform distribution device, the primary fuel gas uniform distribution device and the connecting fuel; the upper part of the fluidized bed reactor is sequentially connected with the dust catcher and the draught fan; the bottom part of the dust catcher is connected with the Venturi diffuser through the ash circulation device; the multistage humidification and activation devices are arranged in the fluidized bed reactor and the Venturi diffuser; and the composite absorbent preparation device is connected with the Venturi diffuser. The multistage humidification and activation technology of the invention improves the pollutant purification efficiency, solves the problem of adhesion and blockage of materials in a tower, and realizes joint, high-efficiency and low-consumption removal of various pollutants in fuel gases.

Description

technical field [0001] The invention relates to the field of tail gas purification in the fields of energy and metallurgy, in particular to an MCFB flue gas purification device for synergistic removal of multiple pollutants. Background technique [0002] In accordance with the requirements of the "Eleventh Five-Year" plan, by 2010, the national SO 2 The total emissions will be lowered by more than 10% compared with the end of the "Tenth Five-Year Plan" period. Although my country's SO in 2007 2 Emissions showed a downward trend for the first time in the past ten years, but the emissions were still 1.732 million tons higher than the 2010 target set in the Eleventh Five-Year Plan Outline. Therefore, SO 2 The pressure to reduce emissions remains enormous. In addition, power plant boilers (including waste incinerators) emit a large amount of harmful substances such as halides, heavy metals and organic matter. The state has promulgated the SO2 in coal combustion exhaust gas ...

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Problems solved by technology

[0007] The invention adopts multi-stage humidification and activation technology in the tower to maintain the uniformity of the moisture content of the absorbent particles, avoiding local over-humidity and effectively prolonging the time when the moisture content of the particles is higher than the critical moisture content, and promoting the rapid absorption of acid gas , improve the purification efficiency of pollutants, and solve the problem of sticking and clogging of materials in the tower caused by the local excessive moisture content of the particles caused by single-stage spraying

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