Flue gas treatment system and method

Abstract

The invention provides a flue gas treatment system and method. The flue gas treatment system comprises a chimney used for circulation of to-be-treated flue gas, a solution storage pool containing a reaction solution, and a solution regeneration unit. The solution storage pool is arranged at the bottom of the chimney. A spraying assembly is arranged above the solution storage pool. The solution regeneration unit comprises a regenerative heat exchanger, a solution treatment device and a waste gas recoverer. A dilute solution inlet of the regenerative heat exchanger communicates with a solution outlet of the solution storage pool, and a dilute solution outlet of the regenerative heat exchanger communicates with a solution inlet of the solution treatment device. A concentrated solution inlet of the regenerative heat exchanger communicates with a solution outlet of the solution treatment device, and a concentrated solution outlet of the regenerative heat exchanger communicates with a solution return port of the solution storage pool. A steam inlet of the waste heat recoverer communicates with a steam outlet of the solution treatment device, and a liquid outlet of the waste heat recoverer communicates with a water supplement port of a cooling tower. In this way, the flue gas treatment system achieves dehumidification of flue gas, avoids white smoke generated by discharged flue gas and ensures the flue gas treatment efficiency and effect.

Description

technical field [0001] The invention relates to the technical field of boiler flue gas treatment, in particular to a flue gas treatment system. The invention also relates to a treatment method based on the flue gas treatment system. Background technique [0002] When the flue gas is discharged into the atmosphere at the chimney mouth, due to the temperature drop, part of the vaporous water and pollutants in the flue gas will condense, forming mist water vapor at the chimney mouth. Subtle changes in color occur due to angles and other reasons, forming a "colored plume", usually white, off-white or blue. [0003] At present, the desulfurization system of coal-fired generating units in my country usually adopts the limestone-gypsum wet desulfurization process. The temperature of the flue gas is reduced to 45-55°C. The low-temperature saturated wet flue gas enters the atmosphere directly through the chimney, and condenses into tiny liquid droplets, thus producing a "white plume...

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Problems solved by technology

[0004] The white smoke produced in the process is not conducive to the diffusion of the smoke, and it is also easy to form secondary pollution, and cause troubles to the lives of the surrounding residents; at the same time, the saturated wet smoke at 60 °C contains 0.1302kg / m3 of water vapor (flue gas), The saturated wet flue gas at 90°C contains 0.4235kg / m3 of water vapor (flue gas), and the average latent heat enthalpy of evaporation of water vapor is about 2500kJ / kg. Therefore, saturated wet flue gas contains a large amount of latent heat, and it will Causes waste of latent heat, which is not conducive to energy saving and emission reduction

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