US 5,878,699 A · Process furnace

Abstract

A twin-cell furnace for process stream preheat and utility steam superheat. The furnace uses a pair of vertical radiant cells with top supported, bottom guided, single row, multiple pass vertical coils fired on opposite sides by floor-mounted burners. An overhead convection section is centered between the radiant cells. Induced and forced draft fans are placed over the convection section to draw combustion gas into the stack and supply air through an air preheater, between the convection section and the stack, and to the floor burners and supplemental convection section burners. Additional convection coils are positioned in the hip section between the radiant cells and the convection section. The furnace design has reduced plot space requirements, increased flexibility in heating multiple services, and allows more even heating of the radiant tubes, and easier radiant tube replacement.

Claims15

Dependent claims

A furnace useful as a primary source of heat in a plant for process stream preheat and a majority of utility steam superheat comprising:

a plurality of horizontally spaced apart, vertical radiant cells, each having a different service and containing a plurality of top supported, bottom guided, single row, multiple pass vertical radiant coils fired on opposite sides by floor mounted burners;
a convention section elevated above the radiant cells and receiving flue gas therefrom;
an induced draft fan for drawing flue gas from the convection section into a stack;
a forced draft fan for supplying air through an air preheater and then to the burners;
and
convection coils in a hip section between the radiant cells and the convection section.

3 more elements

Dependencies are inferred from the claim text.

Process furnace

Life of this patent

Process furnace

Life of this patent

Abstract

Claims15