Density functional theory studies on ortho-position adsorption of SO3 at step sites of a CaO surface with SO2 and CO2

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

“…Recent citing articles of those works still try to elucidate the ash formation mechanisms. [189][190][191] Hence, the topic of ash or deposit formation may still attract some researcher attention in the near future.…”

Experimental Investigation of Removal of SO3 from Flue Gas with Modified Fly Ash Adsorbents

“…With the implementation of increasingly strict environmental standards, ultraclean emission in coal-fired power plants has been extensively advocated and gradually realized. , In the past several years, studies related to mainstream pollutant emission from coal-fired power plants were mainly focused on nitrogen oxides (NO x ), sulfur dioxide (SO 2 ), particulate matter, Hg, etc . Nowadays, controlling nonconventional pollutant sulfur trioxide (SO 3 ), which is in trace amount in the flue gas has been receiving more and more attention. − With the combustion of high-sulfur coal and the application of oxy-fuel combustion for CO 2 capture and storage in power plants, the formation of SO 3 is enhanced. , Although the amount of SO 3 in flue gas is far less than that of SO 2 , its toxicity is ten times that of SO 2 . SO 3 is highly reactive and it can easily react with ammonia (NH 3 ) in a selective catalytic reduction (SCR) reactor to produce sticky ammonium bisulfate (NH 4 HSO 4 ), causing SCR catalyst deactivation, downstream air preheater plugging .…”

“…Due to its unique nature, SO 3 is difficult to remove effectively in widely used wet flue gas desulfurization (WFGD) systems. , Recently, dry-sorbent injection technology has become a promising method for SO 3 emission control. , The sorbent could be injected before the air preheater, at the economizer outlet or the SCR outlet, and then all SO 3 formed in the boiler furnace and SCR can be reduced . The SO 3 removal characteristics is mainly influenced by sorbent properties, flue gas parameters, reactor structure parameters, etc. , Different sorbents have been studied to absorb SO 3 in the literature, which are mainly sodium-, calcium-, and magnesium-based substance, such as NaHCO 3 , Na 2 CO 3 , Na 2 SO 3 , Ca­(OH) 2 , ,− ,,, CaCO 3 , and Mg­(OH) 2 . , Meanwhile, some researches focused on metal oxides, − like CaO, MgO, Na 2 O, and K 2 O, which are fly ash components, especially CaO, ,,, which is one of the main components of fly ash. For the wide industrial applications of dry-sorbent injection technology, selecting a suitable adsorbent material is of great importance .…”

“… 3 Nowadays, controlling nonconventional pollutant sulfur trioxide (SO 3 ), which is in trace amount in the flue gas has been receiving more and more attention. 4 − 6 With the combustion of high-sulfur coal and the application of oxy-fuel combustion for CO 2 capture and storage in power plants, the formation of SO 3 is enhanced. 4 , 7 Although the amount of SO 3 in flue gas is far less than that of SO 2 , its toxicity is ten times that of SO 2 .…”

“… 4 − 6 With the combustion of high-sulfur coal and the application of oxy-fuel combustion for CO 2 capture and storage in power plants, the formation of SO 3 is enhanced. 4 , 7 Although the amount of SO 3 in flue gas is far less than that of SO 2 , its toxicity is ten times that of SO 2 . SO 3 is highly reactive and it can easily react with ammonia (NH 3 ) in a selective catalytic reduction (SCR) reactor to produce sticky ammonium bisulfate (NH 4 HSO 4 ), causing SCR catalyst deactivation, downstream air preheater plugging.…”