A system and method for ultra-low emission of dust and NOx at high temperature

Abstract

The invention provides a system and method for ultra-low emission of dust and NOx at high temperature, which can realize ultra-low emission of dust and NOx in a high-concentration dust environment, and can efficiently remove SO2, SO3, HCl, and HF at the same time. Small size, low operating energy consumption, no waste water discharge, and advanced environmental indicators. It includes economizer, fluidized bed reactor, cyclone dust collector, ammonia injection grid, denitrification dust removal tower, air preheater, induced draft fan and chimney connected by flue in turn, as well as desulfurizer supply system and ammonia gas supply system; the gas inlet of the fluidized bed reactor is connected to the upstream flue, the solid inlet is connected to the output end of the desulfurizer supply system, and the flue gas outlet is connected to the air inlet of the cyclone dust collector; the ash discharge port of the cyclone dust collector is discharged through the middle ash bin The ash device is connected to the solid inlet of the fluidized bed reactor; the ammonia injection grid is arranged in the flue, and its input end is connected to the ammonia gas supply system. Ultra-low emissions of NOx and dust in high-concentration dust environments can be achieved through secondary dust removal.

Description

technical field [0001] The invention belongs to the field of multi-pollutant integrated dry method removal, and relates to the field of integrated removal of dust, NOx and SOx in coal-fired power plant boilers and industrial boilers, specifically a system for ultra-low emission of dust and NOx at high temperature and method. Background technique [0002] my country is rich in coal resources, which can stably meet the demand for electricity for domestic economic development, which determines the pattern of my country's power generation energy dominated by coal. This energy structure and the traditional coal utilization method produce a large amount of air pollutants, such as SOx, NOx, dust and toxic heavy metal mercury. These pollutants will undergo various chemical reactions in the atmosphere to generate more pollutants and form secondary pollution. Mercury is easier to accumulate in the environment than sulfur oxides and nitrogen oxides, and is toxic to humans through the...

AI Technical Summary

Problems solved by technology

These two flue gas purification technologies have obvious shortcomings: first, there is no mature and efficient low-temperature catalyst available, and the flue gas can only be heated to a certain catalytic reaction temperature (300-400°C) for SCR denitrification; The second dust will be deposited on the SCR catalyst, blocking the pores and active sites of the SCR catalyst, resulting in a decrease in denitrification efficiency

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