Abstract: A chair with an adjustable back depth includes a chassis, a seat plate, a back plate, a hinge seat, a pneumatic rod, a trigger piece, a drive piece, a support seat frame, rocking bars. The hinge seat includes a hinge cavity and a rod channel. The hinge seat is arranged in the accommodating cavity. An inner side of a lower end is hinged to a rear hinge hole of the support plate. A lower hinge plate of the rocking bar is hinged to a front hinge hole of the support plate. A main body of the pneumatic rod is hinged to the bottom hinge cavity. The trigger piece is hinged to the hinge seat and cooperates The drive piece is arranged on the chassis An adjustment device consists of the hinge seat, which has a simple structure, convenience in assembly, realize the adjustment of the depth of the back.

Abstract: The invention is directed to a process and a system for removing sulfur dioxide from a feed gas stream. In the process the feed gas pre-scrubbed. Then SO2 is absorbed from the gas with an absorbing medium. The spent absorbing medium is regenerated. These process steps are interchanged with a caustic treatment in the pre-scrubbing zone in case of a very high SO2 content in the feed gas stream. The system comprises a pre-scrubbing unit, an absorption unit, and a regeneration unit. The system is characterized in that the pre-scrubber unit comprises an inlet for an aqueous solution comprising a strong base. These are a simple, cost-efficient and reliable process and facility for processing gas with a varying SO2 content.

Abstract: The invention is directed to a process and a system for removing sulfur dioxide from a feed gas stream. In the process the feed gas pre-scrubbed. Then SO2 is absorbed from the gas with an absorbing medium. The spent absorbing medium is regenerated. These process steps are interchanged with a caustic treatment in the pre-scrubbing zone in case of a very high SO2 content in the feed gas stream. The system comprises a pre-scrubbing unit, an absorption unit, and a regeneration unit. The system is characterized in that the pre-scrubber unit comprises an inlet for an aqueous solution comprising a strong base. These are a simple, cost-efficient and reliable process and facility for processing gas with a varying SO2 content.