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US 2022/0176302 A1Published application
System for eliminating bad-smelling emissions from industrial processes
AssigneeValli Zabban S.P.A
InventorEugenio OLMI
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AssigneeValli Zabban S.P.A
InventorEugenio OLMI
Estimating the term…
A process is described, as well as a plant, for treating a raw vent gas (4,4′) containing bitumen vapours and released by a piece of equipment (1) of a polymer-bitumen membranes production line, in which operations are carried out involving a filler powder (3), such as an operation of mixing the filler powder (3) with the bitumen (2), during which the raw vent gas (4,4′) is changed from a substantially powder-free raw vent gas (4), into a raw vent gas (4′) containing the filler powder (3). The process includes steps of first conveying the raw vent gas (4,4) into a gas-washing device (20) along with a solution (9) of a surfactant; contacting the raw vent gas (4,4) with the solution (9) and removing the powder from the powder-containing gas (4′), releasing a purified vent gas (5) that is substantially free from the filler powder; conveying the purified vent gas (5) into a boiler (40) and burning the bitumen vapours. In a preferred exemplary embodiment, it is conveyed in the gas-washing device only the powder-containing gas (4′) produced during the operations of the piece of equipment (1) that involve the filler powder (3), while in the remainder steps the substantially powder-free raw vent gas (4) is directly conveyed into the boiler (40) by a direct vent line (50) that can be automatically selected. In a preferred exemplary embodiment, the gas-washing device comprises a tank (25) configured to form inside a predetermined head of the washing solution (9) and having an inlet port for the raw vent gas arranged below the liquid head. The process prevents the powder from quickly reaching the boiler (40) making the burner and the heat-exchange surfaces ineffective.
A process for treating a raw vent gas (4,4′) containing bitumen vapours released by at least one piece of equipment (1,1′) configured to carry out a step of treating a filler powder (3), wherein said piece of equipment (1,1′) is supplied with said filler powder (3) and/or performs a mixing operation of said filler powder (3) with said bitumen (2), during said step of treating said filler powder (3), said raw vent gas (4,4′) turning from a substantially powder-free normal raw vent gas (4), into a powder-containing raw vent gas (4′) that also contains an amount of said filler powder (3), said process comprising the steps of:
An apparatus for making polymer-bitumen membranes including
A process for making polymer-bitumen membranes comprising a step of mixing a filler powder (3) with bitumen (2), thus obtaining a polymer-bitumen membrane, and obtaining a raw vent gas (4,4′) that contains bitumen vapours and a residue of said filler powder (3), characterized in that it comprises a process for treating said raw vent gas (4,4′) as defined in claims from 1 to 6.
Dependencies are inferred from the claim text.