Methods, systems, and apparatus for cooling particulates are provided. The apparatus can include one or more coils at least partially disposed within a cylindrical housing. The one or more coils can include a plurality of tubulars connected by return bends disposed at one or more ends thereof. The apparatus can further include a support grid at least partially disposed within the housing and secured to one or more inner surfaces of one or more sidewalls thereof. The support grid can include a plurality of cross members formed of a series of concentric cylinders connected together by a plurality of radially disposed gussets. An outermost concentric cylinder can be disposed proximate the one or more inner surfaces of the one or more sidewalls, and at least one of the one or more coils can be secured to at least one of the cross members, at least one of the gussets, or both. The support grid can also include one or more beams having a first end and a second end fastened to different points on the one or more inner surfaces of the one or more sidewalls. The cross members can be disposed on at least one of the one or more beams.