Integrated system and method for multi-stage white-smoke-removing and purification of flue gas and waste heat recycling

Abstract

The invention discloses an integrated system and method for multi-stage white-smoke-removing and purification of flue gas and waste heat recycling. The integrated system comprises a multi-stage absorbing tower, a primary absorbing liquid storage tank provided with an overflowing tube, a primary solution heat exchanger, a secondary solution external cycle heat exchanger, a secondary solution self-cycle heat exchanger and a secondary solution regeneration device; the multi-stage absorbing tower has more than two stages, is divided into a primary absorbing region and a secondary absorbing regionfrom bottom to top, and is provided with a wet flue gas inlet and a dry flue gas outlet; and the integrated system is further provided with a primary solution cycle loop, a secondary solution externalcycle loop, a secondary solution self-cycle loop and a flow distributing device, and by the flow distributing device, the flow meter of fluid in the secondary solution self-cycle loop and fluid in the secondary solution external cycle loop is (3-5): 1. By the integrated system and method, heat is utilized reasonably, COP value is high, consumption of an absorber is low, the investment cost of thesystem is also low, the pipe blockage and washing problem is greatly relieved, and the system runs continuously and stably.

Description

technical field [0001] The invention relates to an integrated system and method for multi-stage dewhitening and purification of flue gas and waste heat recovery. Background technique [0002] The traditional flue gas dewhitening and purification system only adopts a single-stage tower. The disadvantage of this purification system is that the heat of the system cannot be used reasonably, so the COP value (COP value=system output energy / driving power, wherein: driving power refers to the additional supply provided by the outside world) The electric energy, steam energy or gas heat energy) is low, and the consumption of absorbent is large, and the equipment investment cost is high; the obtained absorption liquid must be recycled through the regeneration system to recover the moisture in the wet flue gas, increasing the consumption of additional heat sources; in the absorption liquid All the solid impurities will enter the follow-up system, such as the pipeline system, heat exch...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the unreasonable use of heat, low COP value and the limitation of absorbent in the flue gas dewhitening and purification system in the prior art. Due to the defects of large consumption, high investment cost, serious pipeline blockage and erosion, and unstable operation of the system, a new type of integrated system and method for multi-stage dewhitening and purification of flue gas and waste heat recovery is provided.

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