US 4,142,712 A · Method and apparatus for effecting uniform heat transfer in an industrial furnace

Abstract

A heat treating furnace is provided with high momentum burners for uniformly heating each work item therein primarily by convective heating. A plurality of work items are spaced in a row on a furnace base and enclosed by an outer cover sealed to the base to define an enclosure therein. High momentum burners are orientated in a predetermined manner in the outer cover to fire jet streams of hot gases into the enclosure. The jet streams rapidly entrain the furnace gases to promote a gas stream of uniform temperature which swirls rapidly about each work item effecting uniform heating of each work item primarily by convection. The furnace is further provided with an efficient internal recuperator arrangement which also functions as the flue for the furnace.

Claims9

Dependent claims

A furnace for effecting heat transfer with injected gases and having a plurality of "n" work items comprising:

a base;
an outer furnace cover having a pair of generally parallel sidewalls, including one sidewall and an opposite sidewall, a pair of generally parallel end walls and a roof, said outer cover sealingly secured to said base to define a heat transfer enclosure;
said work items being arranged on said base in a row along an axis generally parallel to said sidewalls, each work item spaced laterally apart from one another a lateral distance with each end item in said row spaced laterally away from an associated end wall a lateral distance, said laterally spaced distances totalling n + 1 spaces and numbered consecutively from either end wall;
and
jet pump means effecting heat transfer in a substantially uniform manner with all surfaces of each work item, said jet pump means including a plurality of high momentum jet nozzles adapted to discharge gases at high velocity in one of said sidewalls, each nozzle aligned along a jet axis generally perpendicular to said row axis and approximately bisecting an associated lateral distance, said nozzles adapted to fire their gases in alternate lateral spaces.

2 more elements

In a multistand batch coil annealing furnace having a base, a plurality of "n" inner covers, each inner cover enclosing work and sealingly secured to said base, an outer cover having a pair of generally parallel sidewalls, end walls, and a roof sealingly secured to said base to define a heat transfer enclosure containing said inner covers, said inner covers arranged in spaced increments in a row along an axis generally parallel to said sidewalls and spaced laterally apart from one another and from said end walls a total of "n + 1" spaces numbered consecutively from either end wall, the improvement comprising:

jet pump means issuing high velocity hot gases in said heat transfer enclosure for substantially entraining therewith the furnace atmosphere prior to wiping said inner covers, said jet pump means including a plurality of high momentum burners;
each burner orientated to fire its hot gases along an axis generally perpendicular to said row and in an associated space, said high momentum burners disposed in at least one of said sidewalls and further orientated to fire their hot gases in either all odd or all even numbered spaces to effect a circulatory motion of said hot gases in said furnace about each inner cover which is opposite in rotation to that established about an immediately adjacent inner cover.

Dependencies are inferred from the claim text.

Method and apparatus for effecting uniform heat transfer in an industrial furnace

Life of this patent

Method and apparatus for effecting uniform heat transfer in an industrial furnace

Life of this patent

Abstract

Claims9