Vertical cuttings dryer

A vertical cuttings dryer comprising:

• a screen having an interior face and an exterior face;
• a wiper housing positioned inside of the screen and mounted coaxially therewith, thereby defining an annular processing space between the interior face of the screen and an exterior surface of the wiper housing, the wiper housing carrying at least one wiper configured to sweep through the annular processing space;
• a first motor operatively connected to the screen and configured to drive rotation of the screen;
• a second motor operatively connected to the wiper housing and configured to drive rotation of the wiper housing;
• a controller;
• and
• a user interface,
• wherein a speed of the first motor is adjustable independently of a speed of the second motor so as to control both a magnitude of centrifugal force applied to material being processed in the annular processing space as well as a residence time of the material being processed in the annular processing space, and
• the controller is configured to receive a user input via the user interface and, responsive to receiving the user input, set the speed of the first motor and set the speed of the second motor;
• a first drive shaft mechanically connecting the first motor to the screen and a second drive shaft mechanically connecting the second motor to the wiper housing;
• a first vertically-oriented drive shaft,
• a second vertically-oriented drive shaft, a first gear box, and a second gear box, wherein
• the screen is mounted to the first vertically-oriented drive shaft,
• the wiper housing is mounted to the second vertically-oriented drive shaft,
• the first drive shaft is mechanically connected to the first vertically-oriented drive shaft through the first gear box, and
• the second drive shaft is mechanically connected to the second vertically-oriented drive shaft through the second gear box.