A device and method for removing mercury from flue gas by using polyvinyl chloride and boiler fly ash

Abstract

The invention provides a flue gas demercuration device and method utilizing polyvinyl chloride and boiler fly ash. The flue gas demercuration device comprises a boiler furnace, a flue and a chimney, wherein the boiler furnace, the flue and the chimney are connected in sequence, and an economizer, an air preheater, an electrostatic dust collector and a wet desulphurization tower are arranged on the flue in sequence. The flue gas demercuration device further comprises a flue gas mercury on-line monitor, a circulation flue, a crushing device, a gasification device, an air heater, a feeding device and an intelligent control device, wherein the circulation flue is arranged on the flue between the economizer and the air preheater, a discharge port of the feeding device is connected to the circulation flue, and the feeding device comprises a polyvinyl chloride waste material feeding machine and an adsorbent feeding machine. According to the flue gas demercuration device and method utilizing the polyvinyl chloride and the boiler fly ash, hydrogen chloride generated by a polyvinyl chloride waste material is used for oxidizing zero-valent mercury into gaseous divalent mercury, and then the boiler fly ash is used for adsorbing flue gas mercury. On the premise that large-scale reconstruction is not conducted on an existing pollution control device, the flue gas demercuration device and method utilizing the polyvinyl chloride and the boiler fly ash can greatly improve the demercuration effect and demercuration efficiency, thereby lowering demercuration cost, and realizing environment-friendly utilization of the polyvinyl chloride waste material.

Description

technical field [0001] The invention relates to a flue gas mercury removal technology, in particular to a device and method for comprehensively removing mercury in flue gas by using polyvinyl chloride and boiler fly ash. Background technique [0002] Mercury Hg is a toxic heavy metal element. There are two sources of Hg in the environment: natural emissions and man-made emissions. Coal combustion is the largest anthropogenic source of mercury emissions, and the mercury discharged into the environment can cause serious pollution to the environment. Hg emissions from coal-fired power plants can account for 70% of man-made emissions, of which zero-valent mercury (Hg 0 ) is the main form of emission, and it is difficult to remove it due to its stable properties. Therefore, the effective control and removal of zero-valent mercury is a key link in the mercury removal technology of coal-fired flue gas. [0003] At present, experts at home and abroad have conducted a lot of resear...

AI Technical Summary

Problems solved by technology

In the existing technology, the most effective and widely used adsorbent for removing elemental mercury is activated carbon. Although the effect of this technology is remarkable-it can remove 99% of elemental mercury, but the operating cost of this technology (mainly the cost of activated carbon) is high , which is not conducive to large-scale promotion and use, and the injection of activated carbon will have a negative impact on the later utilization of coal-fired fly ash

Images