A case with randomly adjusting handle comprises a shell, frame, spring, fastening member, positional member, sleeve and removable member. The insert defines an enclosed cavity, and includes a first opening in its side through which molten metal can enter the cavity, and a second opening at its top through which molten metal can exit the cavity. In this IGCC plant, a combustion exhaust gas discharged from the heat recovery steam generator is desulfurized and exhausted into the atmosphere. A control module, electrically attached to the non-contacting range sensor, is subject to receive the pulse-width modulated signal.