Improving the removal of fine particles from desulfurized flue gas by adding humid air

Removal of sulfuric acid aerosols in desulfurized flue gas by adding moist air

“…Since the actual vapor partial pressure of desulfurized flue gas with relative humidity 100 %RH was higher, the degree of supersaturation established by adding moist air into the flue gas was higher, which was beneficial for the activation and enlargement of sulfuric acid aerosols. In addition, the size of enlarged condensational‐grown droplets would also be increased in the supersaturation of higher degree due to the enhancement of condensational vapor …”

“…However, when the relative humidity of moist air was increased from 90% to 100%, the increase in ideal supersaturation degree was only around 0.01, which had little effect on the activation of smaller sulfuric acid aerosols. This was because the condensational vapor in the supersaturation atmosphere was mainly derived from the desulfurized flue gas . The role of moist air was to lead to a temperature reduction in the mixed flue gas, causing the saturated vapor partial pressure to decrease.…”

“…Nevertheless, much research has indicated that the removal performance is improved significantly if the size of sulfuric acid aerosols could be increased before entering the conventional pollution‐abatement facility . In recent years, many pretreatment methods have been developed for the enlargement of coal fired fine particles, and many of these pretreatment methods have been proven to be very effective . Heterogeneous vapor condensation is one promising pretreatment method.…”

Purification characteristics of fine particulate matter treated by a self-flushing wet electrostatic precipitator equipped with a flexible electrode

“…In fact, the application of WESPs in Chinese power plants is not used to replace ESPs but to meet strict emission standard as terminal control units. However, the investment and operating costs are very high (Wu et al 2016). A large portion of the operating costs can be attributed to the substantial quantities of water required for cleaning, which poses more serious issues in arid regions.…”

Abatement of Fine Particle Emissions from a Coal-Fired Power Plant Based on the Condensation of SO3 and Water Vapor

“…Although the performance of the fine particle removal in WFGD can be enhanced by these processes, the fine particle emission in the final exhausted flue gas is still too high. The main factor restricting the improvement of the removal performance is the fine particle concentration at the WFGD inlet . Higher concentrations of fine particles work against the enlargement of fine particle sizes in the same supersaturation, which results in a reduction in the improvement of the removal efficiency…”