Process for treating flue gases in a circulating dry scrubber device wherein flue gases containing pollutants pass to a reactor where said flue gases contact a sorbent comprising high pore volume and high specific surface area slaked lime or hydrated lime being further sent to a particulate control device where said sorbent particles are separated from said flue gases substantially depleted in pollutants and form respectively a flow of flue gases substantially depleted in pollutants and a flow of sorbent particles being recycled and returned to said reactor.

A method for installing a spray pipe, including an insertion step of inserting a spray pipe from an opening portion, a positioning step of positioning the spray pipe such that an installation surface of a leg portion faces a supporting surface of a supporting portion, a provisional tightening step of provisionally tightening a first fastening portion to couple an attachment flange with the opening portion, an adjusting step of adjusting the height of the installation surface relative to the supporting surface such that an axis along which a pipe portion extends coincides with the horizontal plane, in the provisionally tightened state resulting from the provisional tightening step, a coupling step of coupling the leg portion to the supporting portion by means of a second fastening portion, after the adjusting step, and a final tightening step of performing a final tightening of the first fastening portion after the coupling step.

A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a first barrier partitioning the space into first and second chamber regions, a flue gas inlet to introduce raw flue gas into the first chamber region, and a flue gas outlet to discharge desulfurized flue gas from the second chamber region; a second barrier partitioning a slurry reservoir into a first reservoir part to store a first pH alkaline slurry and a second reservoir part to store a second pH alkaline slurry; a first sprayer to spray the alkaline slurry from the first reservoir part into the first chamber region to remove sulfur from the flue gas in the first chamber region; and a second sprayer to spray the alkaline slurry from the second reservoir part into the second chamber region to remove sulfur from the flue gas in the second chamber region.

A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a tubular barrier partitioning the space into an inner chamber region having a first volume and an outer chamber region surrounding the inner chamber region and having a second volume, a flue gas inlet to introduce raw flue gas into the outer chamber region, and a flue gas outlet to discharge desulfurized flue gas from the inner chamber region; a slurry reservoir disposed under the chamber to receive and store an alkaline slurry; first and second sprayers to spray the alkaline slurry into the outer and inner chamber regions, respectively, in order to remove sulfur from the flue gas in the corresponding chamber region; and a demister disposed in the inner chamber region between the second sprayer and the flue gas outlet to remove mist from the flue gas in the inner chamber region.

A method of spray drying and washing using a spray drying apparatus, includes: spraying dehydrated filtrate from a spray nozzle hung down from a top side of the spray drying apparatus; introducing a part of flue gas into the spray drying apparatus to dry the dehydrated filtrate; wherein a compressed air is introduced into the spray nozzle to facilitate the spraying and into the wash nozzle to perform air purging during the spray drying, and jetting washing liquid from a wash nozzle provided on a side wall of the spray drying apparatus to wash the spray nozzle and an inside of the spray drying apparatus body, wherein the feeding of the dehydrated filtrate to the spray nozzle is stopped during the washing.

Systems and apparatuses for neutralizing acidic compounds in flue gases emitted from a heat recovery coke oven. A representative system includes a spray dry absorber having a barrel that includes a plurality of wall plates that form sidewalls of the barrel. The wall plates include a steel plate and a corrosion resistant alloy cladded to the steel plate and the wall plates are oriented such that the corrosion resistant alloy faces toward and is in fluid communication with an interior area of the barrel. The alloy is resistant to corrosion caused by the acidic compounds in the flue gas and can prevent the steel plate from being corroded by these acidic compounds.

A method for installing a spray pipe, including an insertion step of inserting a spray pipe from an opening portion, a positioning step of positioning the spray pipe such that an installation surface of a leg portion faces a supporting surface of a supporting portion, a provisional tightening step of provisionally tightening a first fastening portion to couple an attachment flange with the opening portion, an adjusting step of adjusting the height of the installation surface relative to the supporting surface such that an axis along which a pipe portion extends coincides with the horizontal plane, in the provisionally tightened state resulting from the provisional tightening step, a coupling step of coupling the leg portion to the supporting portion by means of a second fastening portion, after the adjusting step, and a final tightening step of performing a final tightening of the first fastening portion after the coupling step.

Process for treating flue gases in a circulating dry scrubber device wherein flue gases containing pollutants pass to a reactor where said flue gases contact a sorbent comprising high pore volume and high specific surface area slaked lime or hydrated lime being further sent to a particulate control device where said sorbent particles are separated from said flue gases substantially depleted in pollutants and form respectively a flow of flue gases substantially depleted in pollutant and a flow of sorbent particles being recycled and returned to said reactor.

A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a first barrier partitioning the space into first and second chamber regions, a flue gas inlet to introduce raw flue gas into the first chamber region, and a flue gas outlet to discharge desulfurized flue gas from the second chamber region; a second barrier partitioning a slurry reservoir into a first reservoir part to store a first pH alkaline slurry and a second reservoir part to store a second pH alkaline slurry; a first sprayer to spray the alkaline slurry from the first reservoir part into the first chamber region to remove sulfur from the flue gas in the first chamber region; and a second sprayer to spray the alkaline slurry from the second reservoir part into the second chamber region to remove sulfur from the flue gas in the second chamber region.

A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a tubular barrier partitioning the space into an inner chamber region having a first volume and an outer chamber region surrounding the inner chamber region and having a second volume, a flue gas inlet to introduce raw flue gas into the outer chamber region, and a flue gas outlet to discharge desulfurized flue gas from the inner chamber region; a slurry reservoir disposed under the chamber to receive and store an alkaline slurry; first and second sprayers to spray the alkaline slurry into the outer and inner chamber regions, respectively, in order to remove sulfur from the flue gas in the corresponding chamber region; and a demister disposed in the inner chamber region between the second sprayer and the flue gas outlet to remove mist from the flue gas in the inner chamber region.