Dry-type efficient and energy saving system for cleaning flue gas of multi-pollutants

Abstract

The invention discloses a dry-type efficient and energy saving system for cleaning flue gas of multi-pollutants, comprising a pre-denitration device, an air preheater, a pre-deduster, an activated coke gas cleaning device, a waste heat recovery device, a deduster and a flue gas exhaust device which are sequentially communicated. A draught fan is arranged between the deduster and the waste heat recovery device or between the deduster and the flue gas exhaust device. The dry-type efficient and energy saving system for cleaning the flue gas of the multi-pollutants simultaneously has the characteristics of dedusting, desulfuration, denitration, mercury removal and waste heat recovery, and is particularly suitable for cleaning and waste heat recovery of the flue gas of the multi-pollutants generated by burning middle-low sulphur coal; and when all or part of the pre-deduster, the activated coke gas cleaning device, the waste heat recovery device and the deduster are formed in an integral device, structural components of the device are reduced, the cleaning process is shortened, and the system resistance is reduced, so that the whole system occupies a small area, and has small investment and low operation energy consumption.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a dry-type high-efficiency, energy-saving and multi-pollutant flue gas purification system. Background technique [0002] The existing multi-pollutant flue gas purification system generally consists of a pre-denitration device, an air preheater, a pre-dust collector, an activated coke flue gas purification device, a dust collector, an induced draft fan, and a smoke exhaust device. The device is a reactor equipped with activated coke or activated carbon, which can adsorb and remove sulfur, nitrate, mercury and other pollutants in the flue gas. The unpurified raw flue gas passes through the pre-denitration device to remove part of NOx, the air preheater reduces the temperature of the flue gas to heat the combustion air, and the pre-dust remover removes most of the dust in the flue gas, then it is removed by the activated coke flue gas purification device ...

AI Technical Summary

Problems solved by technology

[0003] The shortcomings of the existing multi-pollutant flue gas purification system are: no recovery and utilization of flue gas waste heat, high energy consumption in operation, and no effective consideration of energy saving and optimization of flue gas purification process layout among various devices, occupying an area of Large area, high investment and operating costs

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