Boiler flue gas purification waste heat utilization system with concentration function

Abstract

The invention discloses a boiler flue gas purification waste heat utilization system with a concentration function, which comprises a wet desulfurization and moisture absorption spray flue gas-salt liquid heat exchange device, a flue gas waste heat direct heat exchange and recovery flue gas-water heat exchanger and a salt liquid concentration regeneration device, a gas inlet of the wet type desulfurization and moisture absorption spraying flue gas-salt liquid heat exchange device being communicated with a flue gas exhaust port of the boiler, and a gas outlet of the wet type desulfurization and moisture absorption spraying flue gas-salt liquid heat exchange device being communicated with a gas inlet of the flue gas waste heat direct heat exchange recovery flue gas-water heat exchanger, an exhaust port of the flue gas waste heat direct heat exchange and recovery flue gas-water heat exchanger being communicated with an air inlet of a chimney; the salt solution concentration and regeneration device can concentrate dilute salt solution generated in the wet type desulfurization and moisture absorption spraying flue gas-salt solution heat exchange device to form concentrated salt solution, and the concentrated salt solution is sprayed by the wet type desulfurization and moisture absorption spraying flue gas-salt solution heat exchange device. According to the invention, flue gas waste heat utilization and cyclic utilization of the salt liquid in the purification process are realized.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a boiler flue gas purification waste heat utilization system with a concentration function. Background technique [0002] With economic growth and people's higher requirements for quality of life, the demand for energy is bound to increase. Since the reform and opening up, my country's overall energy consumption has shown a steady growth trend. By 2018, the total energy consumption was 4.64Gtce, an increase of 7.13% compared with 1978. At the same time, the energy structure has also undergone tremendous changes. The proportion of coal and oil in total energy consumption has generally shown a downward trend, and the proportion of clean energy consumption such as natural gas, primary electricity and other energy has continued to increase. Although coal is an important part of energy and its consumption has been lower than 59.0% of the total, coal consumption is still grow...

AI Technical Summary

Problems solved by technology

However, the existing boiler flue gas treatment has relatively low desulfurization and denitrification efficiency, water pollution caused by salt solution after desulfurization, high acid dew point to avoid acid corrosion, high exhaust temperature, and large heat loss.

Images