High-temperature pyrolyzing type gaseous mercury form conversion device and method

Abstract

The invention discloses a high-temperature pyrolyzing type gaseous mercury form conversion device and a method. The device adopts a high temperature cracking furnace for heating the incoming flue gas on the basis of the high-temperature pyrolyzing characteristic of mercury under oxidation state, the in-furnace pipeline adopts the spiral arrangement for increasing the staying time of the flue gas in the cracking furnace and the heat exchange area of the gas flow in the pipe is expanded; and meanwhile, a granular inertial ceramic heat storage material is filled in a central area of a spiral pipe, the heat flux in the core area is increased, the heating uniformity of the gas flow in the pipe is promoted and the cracking time of the mercury under oxidation state is shortened; and an acidic gas absorbent is filled in a straight pipe on an outlet section of the cracking furnace, so that the secondary oxidation of the mercury under element state is eliminated and the measuring deviation of the mercury concentration is avoided. The device disclosed by the invention can completely realize the conversion of the mercury under oxidation state to the mercury under element state in the gas phase and can realize the real-time efficient conversion and online accurate measurement for the mercury form concentration in the gas phase under a practical flue gas condition.

Description

technical field [0001] The invention belongs to the field of conversion of mercury form in industrial boiler exhaust gas and on-line measurement of mercury concentration, and relates to a device and device for quickly and efficiently converting oxidized mercury that is difficult to directly measure in the gas phase of flue gas into elemental mercury that can be accurately identified by a mercury meter. method. Background technique [0002] Mercury and its compounds have attracted worldwide attention due to their high volatility, bioaccumulation and strong neurotoxicity. With the development of industrialization, the problem of atmospheric mercury emissions caused by coal combustion, metallurgy, cement production, and mineral mining has become more and more serious. Among them, coal combustion mercury emissions account for the largest share of global anthropogenic mercury emissions. Many countries and regions around the world have successively formulated relevant laws, regul...

AI Technical Summary

Problems solved by technology

The former wet chemical conversion method has problems such as low stannous chloride reduction efficiency, easy consumption of reagents, and the need for regular replacement, which is limited in the application of long-term on-line monitoring of mercury form concentration in flue gas

The latter also has the problem of catalyst deactivation when exposed to acidic gas, and the catalyst life is short, which seriously affects the conversion efficiency of oxidized mercury.

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