US1896625A

US1896625A - Heat treating apparatus

Info

Publication number: US1896625A
Application number: US511262A
Authority: US
Inventors: Reed W Hyde
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-01-26
Filing date: 1931-01-26
Publication date: 1933-02-07
Anticipated expiration: 1950-02-07

Description

Feb. 7, 1933. R'W. HYDE HEAT TREATING APPARATUS Filed Jan. -23, 1951 3 Sheets-Sheet -1 1 VENTOR. fi d W fia c. BY M q ATTORNEYS.

Feb. 7, 1933. R. w. HYDE 1,896,625 HEAT TREATING APPQAIRATUS Filed Jan. 25, 1931 s Shets-Sheet 2 Feb. 7, 1933. v w HYDE 1,896,625

HEAT TREATING APPARATUS Filgd Jan. 26, 195; s Sheets-Shet 5 1 lo 25 a H I U I l [I i g i: 1: 5 h i l 'il 8 1' l I I I n I I I v I I I ATTORNEYS.

IN V EN TOR.

- Patented Feb. 7, 1933 UNITED STATES 1mm) w. min, or summr, NEW JERSEY m1 rana'rme arrana'ros Application flled lanuary 26, 1981. Serial No. 511,282.

This invention relates to an apparatusfor heat treating materials, and more particularly to an a paratus for calcining limestone and other alEaline earth carbonates.

The invention relates to the type of apparatus in which the material to e treated is assed in a thin pervious layer through a iieating zone where gases heated to the calcinin temperature are caused to pass downward y through the entire layer and provides for producing the hot gases and uniformly distributing them over the layer of material under treatment. This is accomplished by locating the burners in a portion of the heating zone sufiiciently remote from the material so that complete combustion is obtained before the hot gases are applied thereto. A ilurality of burners are placed along the heating zone and are adapted to be individually controlled to permit regulation of the heat distribution longitudinally of the apparatus.

The invention further consists in the new.

and novel features of operation and the new and original features of construction and combinations of parts hereinafter set for' th and claimed.

Although the novel features which are believed to be characteristic of this invention will be particularly pointed outin the claims appended hereto, theinvention itself, as to its objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawings forming a part thereoffin which Fig. 1 is a side elevation, partly in section, of a heat treating machine constructedin accordance with the present invention;

' Fig. 2 is a vertical section of the machine taken along the line 2-2-of Fig. 1;

Fig. 3 is a horizontal section through a per tion of the heating chamber taken along the line 33 of Fig. 2 showingthe shape of the.

inlet ports; and

- .Fi 4: is a half transverse section of a modi ed form of the device in" which the burners are inserted from the bottom of the 0 heating chamber.

are passed along track 11 an Like reference characters denote like parts in the several figures of the drawings.

In the following description and in the claims, various details will be identified by specific names for convenience, but they are intended to be as generic in theirapplication as the art will permit.

Referring to the drawings more in detail, the invention is shown as applied to a machine comprising a plurality of pallets 10 having perforate bottoms which are su ported on a suitable trackway 11 and are riven by a driving wheel 12 which is adapted to engage said pallets and force the same along said trackway. Track 11 is supported on a framework 13 which may be of any convenient construction and which also carries a wind-box 14 which communicates with the entire under surface of said allets' as they (i forms a comparatively tight seal for preventing escape of gases. The gases may be withdrawn through ipe 15 which extends into the side of windox 14 and communicates with a suitable suction apparatus (not shown). A damper 16 may be used to re late the suction applied to the perforate ottoms of the pallets for drawin gases therethrough. Any dust that may drop into the wind box may be removed through hinged cleanout doors 31.

For heat treatin the material in said pallets, there is provi ed a heating chamber 17 formed by a roof 18, side walls 19 and bottom members 24 of refractory materiah- Said chamber overhangs thesides of the pallets asubstantial distance, and the bottom members 24 extend over the pallets sides to protect the same from the intense heat of the gases which are drawn downwardly through the charge. A plurality of burners 21 communicate with fan shaped ports 20 in the side walls 19 and receive fuel, such as as or oil, from a header 23. Each of said urners is provided with a valve 22 whereby individual regulation of the burners may be obtained.

Said ports 20 are so located with respect to the pallets 10 that the hot gases are caused to travel a substantial distance before being applied to said pallets. This permitscom- 1 an even distribuw entire chz'zrgc. The -oortion of the heating chamber is are pieced rovides e A section in which the hot bustion sire formed out of .e charge and complete comel is obtained before they sti g chamber is Q e :1 S111iJ2lDl8 rrsmework 20. 26, such es reenrorced ssers in position to contact with pellets for forming esubl seal and preventing the on gases, l -eterial to he treeted msy he to the pellets by means of hopper l ed directly above the pulposition that the pellets are thereunder prior to their pesseating chamber U.-

sllets have passed through the are inverted and dump their with driving wheel 12, in efrect continuous chem o; eretion of the shore described the msteriel such es limestone is him nermeehle leyer to the variss my pass under hop er 2?. then posses through the 1 eating 'niug beet/ed to a, celnhich are passed doom layer into Wind-hots 14-. lhe speed of travel s so reguleted that the in the heating chamber for me to cause the coldesired extent combustion sccherge, is the rned and uniforml to the l 1 I -polied nee I '1 he longiauc me he controls i in cert ale to maintain his chamber at e c discharge end, cooling tendency materiel that the calcining proceeds uniformly and is complete when the pellets emerge from the discharge of the lieutin cheinh The details of the burners have completely set forth inasmuch as th are of standard construction and i teinplatod that oil burners or burners may be employed. Also the burners may be provided with suitable means for regulating the combustion therein, as for example, a suitable air control 3 as Well as the fuel control valves disclosed in the form of the invention illustrated in Fig. 4, the construction of the machine is similar to that of the machine illustrated in Figs. 1--3 with the exception of the burners which are arranged to direct the flame upwardly through base 24; instead. of horizontally through side walls 19. The parts accordingly have been given corresponding reference numerals and the construction may be understood hy referring to the foregoing description. in Fig. 4 the gases of combustion impings on the roof l8 and are directed by said roof downwardly onto the bed of material contained on the pallets. The curvature of the roof thus aids in directing and distributthe gases uniformly across the charge.

It will be seen that this invention provides continuous heat treatment apparatus of the type in which hot gases are drawn through it layer of material to deliver heat thereto in which by use of snumber of separately regulutehle fuel burners. each projecting hot combustion gases over at comparatively small sires of the layer Wide variation in the heat treatment is possible While maintaining uniform treatment as to the material as a Whole. By suitable regulation of the individual burners, the heat treatment given the material at diiierent points Within the chamber may be maintained the some, or may be varied Widely. For example, the burners may be adjusted to give an intense initial heating, followed by a prolonged lower temperature treatment or enner inr; or the material may he slowly and given a final brief high :reetment, and other varieties. stood by those skilled in the s any event since the flow of material Y amber is uniform, all portions iii-ll receive the same hes; treetri liile oer iin novel features of the invcntion have bee disclosed and ere pointed out in the snow i clerics it will he understood that various omissions substitutions and changes he made by those skilled in the art Without depsrting" from the spirit of the invention.

What is c i In an sp for heat treating moteriel a he i her in which a charge of s mi" a a series of receptacles some supporting said charge in a pervious layer, said receptacles being movable successivelfy through said heating chamber, a portion 0 said heating chamber overhanging said receptacles, and openings for burners in said overhanging portion, said burnersbeing located a sufiicient distance from said receptacles so that the combustible material is completely burned before bein applied to said charge and whereb a uni orm transverse distribution of the li ot gases is obtained.

2. In an apparatus for heat treating material, a heating chamber in which'a charge of material is heated, a series of receptacles having perforate bottoms for supporting said material in apervious layer, said receptacles being movable successively through said heating chamber, a portion of said heating chamber overhanging said receptacles and openings for burners in said overhanging portion, said burners being spaced longitudinally of said chamber whereby the hot gases are applied throughout the length thereof.

3. In an apparatus for heat treatingmatev rial, a heating chamber in which said material is heated, a series of receptacles having perforate bottoms for supporting said material in a pervious layer, said receptacles bein movable successively through said heatmg'chamber, a portion of said heating chamber overhanging said receptacles and openings for burners in said overhanging rtion, said burners being spaced longitudinally of said chamber whereby the hot gases are applied throughout the length thereof and said burner openings being fan shaped for spreading thegases longitudinally.

4. In an apparatus for heat treating material, a heating chamber in which a layer of said material is heated, a series of receptar 'cles having perforate bottoms for supporting said material in a pervious layer, sa d receptacles being movable successively through said heating chamber, a portion of said heating chamber overhanging said pallets and'having transverse burner openings extendin through the sides thereof, said burners icing located a suflicient distance from said receptacles so that the fuel is 'completely burned before the products of combustion are applied to said charge and where- .by a uniform transverse distribution of gases is obtained.

5. In an apparatus for heat treating material, a heating chamber in which a charge. of said material is heated, a series of receptacles having perforate bottoms for supporting said material in a pervious layer, said receptacles being movable successively through said heating chamber, a portion of said heating chamber overhanging said pallets and having transverse burner openings extending through the bottom thereof for introduc ing combustible material into said chamber, said burners being located a sufiicient dis-' tance from said receptacle so that the fuel is com letely burned before the products of com ustion are applied to said charge and whereby a uniform transverse distribution of bustible material into said chamber, said.

burners being located a sufiicient distance from said receptacles so that the fuel is completely burned before the products of combustion are applied thereto and whereby a uniform transverse distribution of gases is obtained. i

7. An apparatus for heat treating material comprising a heating chamber in which ,fia; charge of said material is heated, a series of receptacles having perforate bottoms for supporting said charge in a pervious layer, said receptacles being movable successively through said heating chamber, said heating chamber being of a substantial length whereby a plurality of said receptacles-may be maintained therein and overhanging said receptacles transversely to provide a combustion section in which gases may be heated before they are applied to the charge, and burners located longitudinally of the heating chamber at s aced points and extending into said combustion section and spaced from the receptacles topermit the fuel to be com lets 1y burned out of contact with said 0 arge whereby an even transverse distribution of the products of combustion is obtained.

8. An apparatus for heat treating material comprising a heating chamber in which a. charge of said material is heated, a series of receptacles having perforate bottoms for sup porting said material in a pervious layer, said receptacles being movable successively through said heating chamber, said heating chamber being of a substantial length whereby a plurality of said receptacles may be maintained therein and overhangingsaid rece taclestransversely on both sides to rovi e a combustion space out of contact with said charge, and having burners located longitudinally of the heating chamber at spaced points and extending into said combustion space from opposite sides.

9. An apparatus for calcining limestone comprising a heating chamber in which a charge of limestone is heated, a series of receptacles having perforate bottoms for supporting said material in a pervious layer, said receptacles being movable successively through said heating chamber, said heating chamber having base members of refractory material and a seal comprising flexible mem- 5 bers carried by said base members and contacting with said receptacles to prevent escape of gases therebetween.

10. An apparatus for heat treating material comprising a heating chamber in which 10 said material is heated, a series of receptacles having perforate bottoms for supportingsaid material in a pervious layer, said receptacles being movable successively through said heating chamber, said heating chamber having 15 base members extending over the sides to protect them from the intense heat of the products of combustion, and a seal comprising flexible members of heat resistant material carried adjacent said base members and en- 2 ging said receptacles to prevent leakage of ot gases.

In testimony whereof I have hereunto set my hand.

REED W. HYDE.