Flue gas reheating system based on phase-change heat transfer and fluoroplastic technologies

Abstract

The invention discloses a flue gas reheating system based on phase-change heat transfer and fluoroplastic technologies. The flue gas reheating system is arranged at the tail of a flue of a boiler; a last stage air preheater, a dust remover and a desulfurizing tower are sequentially arranged between the tail of the flue and a chimney; and a flue gas outlet of the dust remover is connected with a flue gas inlet of the desulfurizing tower. The flue gas reheating system comprises a phase-change waste heat recovering module for recovering waste heat of flue gas, a fluoroplastic reheating module for reheating the low temperature flue gas after desulfuration, and an automatic control module for automatically controlling the flue gas reheating system integrally, wherein the phase-change waste heat recovering module is arranged in the flue between the last stage air preheater and the dust remover, and the fluoroplastic reheating module is arranged in the flue between the desulfurizing tower and the chimney. Compared with the prior art, the flue gas reheating system has the advantages of good waste heat recovering performance, adjustability, controllability, stability, reliability, good reheating performance, corrosion resistance, little energy consumption, etc.; flue gas discharge power of the boiler is improved greatly; and the surrounding environment of a power plant is improved.

Description

technical field [0001] The invention relates to a flue gas reheating system, in particular to a flue gas reheating system based on phase conversion heat and fluoroplastic technology. The flue gas reheating system can improve the utilization rate of flue gas waste heat and increase the power of boiler exhaust. It is mainly used in tail flue systems such as thermal power boilers, industrial kilns, and heating furnaces. Background technique [0002] Due to the changeable composition of the coal used, the actual operating exhaust gas temperature in existing thermal power plants in China often does not reach the design value, resulting in a decrease in the actual operating efficiency of the boiler; The normal operation of the dust collector affects the working efficiency and service life of the dust collector, and reduces the operation stability of the unit. [0003] In addition, the existing thermal power plants in operation generally adopt the wet desulfurization technology, a...

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Problems solved by technology

However, after the wet desulfurization of the flue gas, the temperature of the flue gas drops to a low level, resulting in the condensation of acid dew in the flue gas, which will corrode and damage the inner wall of the flue and chimney, causing irreparable damage and reducing the reliability of the unit. It shortens the maintenance cycle of the unit, increases the maintenance cost of the unit, and reduces the power generation and income of the unit; in addition, if the low-temperature flue gas after desulfurization is directly discharged into the atmosphere through the chimney, the flue gas Insufficient discharge power will increase the difficulty of chimney discharge and reduce the diffusion height and range of flue gas discharge; it is easy to form gypsum rain and acid droplet settlement around the power plant, causing serious damage to the surrounding environment of the power plant and affecting the power plant. Operation and related evaluation

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