Rotary plough for gasifiers

A rotatable grate assembly for a gasifier for gasifying carbonaceous material producing ash, the grate assembly including

• a rotary component configured to rotate about a vertical axis of rotation in at least one direction;
• and
• a plurality of rotary ploughs mounted to the rotary component to rotate together with the rotary component in a horizontal plane about said axis of rotation to describe a circle,
• said plurality of rotary ploughs each including
• an elongate wedge-shaped in plan view metal body extending away from and widening in plan view away from said axis of rotation and having opposed longitudinally extending faces, at least one of said faces having at least two major surfaces which are not coplanar, a first, upper, major surface being angled towards the other of said faces to slope upwardly towards the other of said faces at an angle of at least 1° to the vertical and a second, vertical, lower, major surface being angled in a horizontal plane at an angle of at least 1° relative to a radius of said circle described by the rotary ploughs.