A process for controlling the conversion progress of inorganic bromine in the flue gas in the post-combustion zone
A flue gas, inorganic technology, applied in the direction of climate sustainability, combustion technology mitigation, greenhouse gas reduction, etc., can solve problems such as no promotion, and achieve the effect of promoting effective recycling, increasing economic benefits, and high conversion rate
Active Publication Date: 2017-12-15
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
However, the relevant literature (and patents) did not propose a method to promote the conversion of HBr in flue gas
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] Process flow diagram of the present invention is as figure 1 Shown, the equipment flow diagram of the present invention is as figure 2 shown. Bromine-containing high-temperature flue gas from the high-temperature combustion chamber and the second combustion chamber (about 1000 ° C ~ 1400 ° C; the raw material contains Br 6.5 wt.%, and the inorganic Br content in the flue gas is about 11g / Nm 3 ) enters the indirect heat exchange flue gas "chilling" device 1, and cools to about 600°C within 0.3s, (23% of the HBr in the flue gas is converted to Br 2 ), and then the flue gas passes through the high temperature resistant dust removal device 2 to remove the fly ash. Then, within 0.5s, the flue gas passes through the flue gas quenching device 3 with indirect water cooling and heat exchange, and the temperature drops to about 250°C (about 2...
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The invention discloses a process for controlling the conversion (conversion of HBr to Br2) progress of inorganic bromine in flue gas in an afterburning zone. A flue gas "chilling" device, a flue gas quenching device, a slow cooling device I, and a slow cooling device II are employed for gradual segmented treatment, a proper flue gas cooling temperature gradient is determined and the cooling time of high temperature region flue gas is controlled to reduce the Br2 content of flue gas in a proper temperature range (550-250DEG C) for dioxin substance generation, the process does not consume chemical reagent, does not generate new pollutant and saves the operation cost. The slow cooling process involved in the invention also adopts phased cooling, firstly a high temperature cooling medium is employed to cool flue gas and then a lower temperature cooling medium is used for further cooling, the residence time of flue gas in a relatively high temperature region is prolonged, and the HBr in the flue gas can maintain a relatively high conversion rate so as to ensure a conversion rate of more than 85%, thereby being conducive to improving the recovery rate of inorganic bromine.
Description
technical field [0001] The invention belongs to the technical field of energy and environmental protection engineering, and specifically relates to a process for reducing the activity of bromine sources of brominated dioxins in the flue gas of a post-combustion zone of a high-temperature combustion disposal system for bromine-containing substances and promoting the recovery of inorganic bromine in the flue gas. Background technique [0002] Environmental pollution and waste of resources caused by discarded printed circuit boards have attracted widespread attention from the government, scholars and the public. Among the various disposal and recycling methods of waste printed circuit boards concerned by relevant research, compared with other methods, the pyrometallurgical process characterized by high-temperature combustion has the important advantage of high recovery rate of precious metals, and can effectively recover metal copper. , can achieve the maximum recycling of reso...
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IPC IPC(8): B01D53/00F23J15/06F23J15/02
CPCY02E20/30
Inventor 肖菡曦蔡铁军邓谦彭荣华刘清泉
Owner HUNAN UNIV OF SCI & TECH