US1730739A - Preheater - Google Patents

Description

06h89 1929. A. R. MCARTHUR PREHEATER Filed Jan. 14, 1928 2 Sheets-Sheet @@@QGGQQol i 1 l l 1 l I l Patented @et 8, i929 .AIRTIEIIIIJ'IR R. MCARTIEIUR, 0F GARY, INDIANA, .SSIGNOR T0 AMERICAN SHEET Il'D TIN PLATE coMrANY, or PI'r'rsBURGEf PENNSYLVANIA, a conroaarron4 or New JERSEY PREHEATER Application led January .14, 11928. Serial No.1 @16,87%l

This invention relates topreheaters for iiuids used 'to' promote combustion in heating furnaces and, While not limited in any 'Way thereto, is illustrated in connection with,

and is particularly adapted for, use with a continuous packvheating furnace for heating sheets and packs of sheets.

One object yof the present invention is to provide a preheater which will serve to conduct the products of combustionfrom .the Work discharge pdr't of the furnaceto a. stack so as to preventthe discharge of said products of combustion into'the mill, and at the same time will utilize said products of combustion to preheat.. the fluids used to promote the combustion inthe furnace.

Another object is to provide a novel form of preheater including a flue-portion adapted to receive the cold or atmospheric air drawn into said preheater and to'prevent said cold or atmospheric air from coming into contact with the conduitspontaining the fluids-to be preheated. Y

A further object isto providel a preheater having. `the novel construction, design and arrangement of parts hereinafterfdescribcd and illustrated in the accompanying draw- In the drawingsn l F'g'ure 1 is a longitudinal lsectional elevation throughfa pack "heating furnace having thev preheaterof this invention ap-v pliedthereto.

Figure 2 S all enlarged yfront elevation vof the preheater.I

Figure 3 is a Vsectional plan takenon the line IIL-IH of'Figure 2. Y

Figure 4 is a verticalsectional elevation on the lineIV--IV ofvFigu'reB. A Figure 5 is la sectional side Aelevation through the preheater.' l Y Figure is a fragmentaryjdetail 'showing the manner 'in which the preheate tubes are connected to the manifolds. l A

Referring'more particularly to the drawings, the numeral 2 designates'thefurnace.

as a whole, which'has a combustion chamber 3 along one side from which the products'of combustion are adapted V to be delivered `to the interior of the furnace proper which cem` prises a heating chamber d. if

charging port 'is formed in the rear end of the furnace and an'exit or dischar e port 6 is provided in the forward end of t e furnace through which the material or -work to be heated is charged and discharged, respectively. y A conveyer'consisting of a `pluralityof conveyer rollers 7 is provided in the furnace for conveying the Workthrough the furnace;

In operation, the products 'of combustion pass from the combustion chamber 3 into the Vheatinor chamber 4 and takeon a swirling or .centrifa ugal motion, which causes themv to travel' forwardly through the furnace and pass outof the discharge port 6. During the The furnace proper forms the subject(mat-V ter of a separate ap lication for patent and thereforewill not illustrated in detail in this application.

In order toprevent the waste yproducts' of combustion from escaping into the atmosphere of the mill and at the same time to utilize-the heat of said Waste roducts, a reheater A is mounted on the orward en of the furnace immediately above the discharge port A6. Y A 1 The reheater A comprises anouter substantia y rectangular shell 9 having its upper end closed b a Wall 10 and itsI lower end open to receive -t e products of combustion froin the furnace discharge port 6.

A stack 12 is mounted above the furnace 2 A and the preheater A has its upper end connect'ed to the stack 12 by a flue 14,

Manifold shells 15 and 16 are mounted along the respective sides of thefshell 9 to.

e further described Olf .to conduct the ieheated fluid tothe burner 21, indicated in gure 1.

A transverse partition wall 22 extends be- 100 vco tween the manifold shells 15 and 16 in a plane parallel with the front wall of the outer preheater shell 9 so as to divide the interior of the shell 9 into a flue portion 23 and preheating chamber 24. The wall 22 terminates short of the upper and lower ends of the shell 9.

v A plurality of prehcater conduits or tubes 25" extend transverselyY of the chamber 24 and have their ends communicating with the respective manifold chambers. The manifold chambers 17 and 18 are divided into sections by dividing walls 26 and 27, respectively, so as to cause the fluid to 'be preheated to flow back and forth through respective groups of the conduits 25.

In the' specific embodiment of the invention illustrated thirty-six tubes are used, arranged in transverse rows of three tubes each. The

wall 26 is mounted in the manifold chamberI 17 between the fourth and fifth rows of tubes from the top, and the wall 27 is mounted in the manifold chamber 18 between the eighth and ninth rows of tubes from the top, so that the tubes are divided into three groups of 'twelve tubes each.

lThe air or other fluid will enter the manifold chamber 17 through the conduit 19- and will pass through the uppermost group of tubes 25 into the manifold chamber 18. The fluid will then flow in the reverse direction through the 4next lower group of tubes 25, into the portion of the manifold chamber 17 ybelow the wall 26. The flow of fluid will again be reversed in direction and flow through lthe lowermost group of tubes 24,

into the portion of the manifold 18 below the wall 27, and the fluid will then pass from the manifold chamber 18 through the conduit to the burner 21.

In operation, the flames and'other products of combustion pass from the discharge port 6l of the furnace 2 and are drawn up through the reheater vshell 9, due to the natural draft created by the stack 12.v .The preheater shell is so proportioned and the wall 22 is so positioned that the major portion ofthe flames and products of combustion will pass upwardly through the preheating chamber 24 and only a very small proportion thereof will pass into theflue portion 23 forward of the wall .22.

Due to the draft created by the stack, .the atmospheric air will be drawn into thepreheater shell. However, due tothe wall 22, the major portion of suchair will be drawn up through the flue portion 23 and, therefore, will not come in contact with the tubes 25, so that a higher temperature is maintained around the tubes 25 than would be possible if the cold air'were permitted to intermingle with the products of combustion in the preheating chamber.

While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited preheating thereto since various modifications may be made without departing from the scope thereof, as defined in the appended claims'.

I claimy 1. The combination with a heating furnace having adischarge port through which the materialv being heated is discharged and through vwhich the productsI of combustion pass from the furnace, of a preheater located at the discharge end of said furnace immediatelyabove said discharge port, said preheater comprising a shell having an open lower end and a closed upper end, a transverse partition wall in said shell dividing said shell into a flue portion along the front wall and a-prcheater chamber between said flueportion and the rear' wall of said shell, a manifld chamber formed at each side of said shell, a plurality of conduits extending transversely of said shell and 'communicating with said manifold chambers, an inlet port in one of said manifold chambers for the fluid to be preheated, an outlet port in the other of said manifold chambers for the preheated fluid, a stack, and means connecting the upper end of said shell and said stack, whereby a draft is created to cause the products of combustion to flow upwardly from said discharge port through said shell, said flue portion along thc front wall of said shell being adapted to receivethe cold air drawn into the preheater by the draft created by said stack and also to receive at least a part of the products of combustion from said furnace.

having a discharge port through which the material being heated is discharged and through which the products of combustion pass from the furnace, of a preheater located at the discharge end of said furnace immediately above said discharge port, said preheater comprising a shell having an open lower end and a closed upper end, a transverse partition wall in said shell and terminating short of theends thereof, said partition wall dividing said lshell into a flue portion along the front wall and a preheater' chamber between said flue vportion and the rear wall of `2. The combination with a heating furnace I said shell, a manifold chamber formed aty l each side of said shell, a plurality of conduits extending transversely of said shell and communicatmg w1th said manifold chambers, an inletport in one of said manifold chambers for the fluid to be preheated, an outlet port in the other of said manifold chambers for the preheated fluid, a stack, and means connecting .the upper end of said shell and said stack, whereby a draft is created to cause the products of combustion to flow upwardly from said discharge port through said shell, said ilus portion along the front wall of said shell being adapted to receive the cold air drawn into the preheater by the draft created by said stack and also to receive at least a part of the products of combustion from said furnace.

ist l l a discharge Aadapted to receive t 3. The combination with a heating furnace having a discharge port through which the material being heated is discharged and through which the products of combustion pass from' the furnace, of a preheater located at the discharge end of said furnace immediately above said dicharge port, saidpreheater comprising a. shell having an open lower end and a closed upper end, a transverse parti-- tion Wall in said shell dividing said shell into a flue portion along the front wall and a preheater chamber between said flue portion and the' rear wall of said shell, a manifold chamber 'formed at each side of said shell, a plurality of conduits extending transversely of said shell and communicating withsaid mani-4 fold chambers, manifold chambers for the fluid to be preheated, an outlet, port in the other of said manifold chambers for the preheated fluid, means for dividing said manifold chambers so as to cause the iluidsto be preheated to ,flow alternately in opposite directions through groups of conduits, a stack, and means connecting the upper end of said shell and said stack,' whereby a draft is created to cause the products of combustion to flow up- Wardly from said discharge port through said shell, said flue portion along the front Wall of said shell being adapted to receive the cold air drawn into the preheater by the draft created by said stack and also to receive at least a part of the products of combustion from said furnace.

Ll. The combination with a furnace having port through which the products of combustion pass from the furnace, of a preheater located outside of said .furnace and immediately above said port, said preheater comprising a shell having its lower end open to receive the products of combustion and having an op'ening adjacentjts upper end through which the products of combustion escape7 a. transverse partition Wall in said shell dividing said shell into a flue-portion along the front Wall and a preheater chamber between said .flue portion and the rear Wall of said shell, a manifold chamber formed. at each side of said shell, a plurality of conduits extending transversely of said shell and communicating with said manifold chambers, means for admitting Huid to be heated to one of said manifolds, and means for permitting the discharge of the heated fluid from the other of said manifolds, said flue portion along the frontwall of said shell being c cold air drawn into the preheater by the draft through said preheater and also to receive at least a part of the products of combustion from said furnace.

In testimony whereof have hereunto set my hand.

ARTHUR R. MCARTHUR.

an inlet port in one of said-

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