Waste heat recovery system for improving efficiency of electric dust collector

Abstract

The invention discloses a waste heat recovery system for improving the efficiency of an electric dust collector, belonging to the technical field of a flue gas waste heat recovery system of a thermal power plant and the like. The system comprises a high-temperature flue gas pretreatment device, an air preheater, an electric dust collector, a desulfurization system and a chimney which are connected sequentially, wherein a waste heat recovery device is cooperatively arranged between the air preheater and the electric dust collector; the waste heat recovery device comprises a shell and a heat exchange tube bundle cooperatively arranged in the shell; the heat exchange tube bundle is a spiral finned tube; and a liquid inlet I is arranged at one end of the heat exchange tube bundle, and a liquid outlet I is arranged at the other end. The waste heat recovery system disclosed by the invention has a simple overall structure, a self-dust cleaning function and a good heat exchange effect, and prevents dust accumulation; the temperature of the flue gas is reduced from 130-180 DEG C to 90-110 DEG C, and the water temperature is increased from 40-70 DEG C to 70-100 DEG C; and moreover, the volume of the flue gas entering the electric dust collector is reduced, the flow velocity of the flue gas is reduced, the efficiency of the electric dust collector can be effectively improved, and the discharge requirement of the new standard is met.

Description

technical field [0001] The invention belongs to the technical field of flue gas waste heat recovery systems such as thermal power plants, and specifically relates to a waste heat recovery system for improving the efficiency of an electric dust collector with simple structure, good recovery effect, energy saving and emission reduction. Background technique [0002] The "Emission Standard of Air Pollutants for Thermal Power Plants", which has received much attention, was released on July 9, 2011 and implemented on January 1, 2012. The new standard has substantially adjusted the emission concentration limit of air pollutants, stipulated the time limit for the existing thermal power units to reach a more stringent emission concentration limit, canceled the regulation on the maximum allowable emission rate of sulfur dioxide in the whole plant, and added the gas-fired boiler air pollutant emission limit. For emission concentration limits, special limits for air pollutants have bee...

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Problems solved by technology

These all consume a lot of energy

If the cold water in the system is used to absorb the waste heat of boiler exhaust, it can significantly save energy, reduce emissions and improve efficiency; at the same time, the effect of using GGH in many power plants is not ideal. The phenomenon of "gypsum rain" in the surrounding area

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