US1713237A - Drier - Google Patents

Description

W. T. MORIN May 14, 1929.

DRIER Filed Jan 1928 2 Sheets-Sheet iii/z:

y 4, 1929. w. T. MORIN 1,713,237

DRIER F l an- 1928 2 Sheets-Sheet 2 25 or granularmaterial and -45 passing the air upwardly Patented May 14, 1929. 4

- 1,713,231 UNITED STATES" PATENT, OFFICE.

WILLIAM 'r. mam, or Los ANGELES, caniroanm, assmnon 'ro rncm xc anansrvr.

SUPPLY COMPANY, OF LOS ANGELES,

' mama.

CALIFORNIA, A CORPORATION OF CALI- ,nama.

imam filed lannary ll, 192;. Serial No. 245,934.

My invention is a drier and method of drying, in which mat rials drop through a heating chamber in a oose state and in such dropping action are subjected to. a drying action.

An objectof my invention is a drier and method of drying various materials, in which such materials are dropped by gravity in a loose manner to a dr ,ing chamber and in such chamber are sub ected to the heat of radiation transmitted from a radiating surface without the materials contacting such surface and with there being no intermediary structure between the surface and the materials. By this procedure heat of radiation is transmitted through a gaseous medium to the material to be dried.

In addition to utilizing the radiant heat, I may also subject material to drying by heat of convection, in which hot gases or hot air passes upwardly through .thedownwardly dropping loose material. My drier and method may be applied as a drier of liquids in a finely divided s tialte or pulverized ay also be employed for heating material m'various industrial procedures without performing the function of drying. s In one form of my inventionI may pass ao hot roducts. of combustion through flues or ot er passages therefor, these flues being made of material having high thermal conducting properties so that heat willybe radiated from the surface of such flues and such radiated heat is used directly to dry the materials to be treated. In addition to this, if desired, the materials may be also subjected to. direct convection drying by passing :the roducts of combustion upwardly throug the downwardly descending material. Or if the productsof combustion would be injurious to the material being dried I may use a heat .interchanger, heating air by the products of combustion and through the material to be dried, thus drying y. convection in addition to direct radiation. In constructing my' drier I preferably utilize a furnace having flues passing ealong opposite sides with a; drying cham r between the flues. At the top of the chamber there is a suitable means-to pass the materials to bedried therein, these materials dropping into a collecting receptacle, and

manner of locating then into a dischar e spout. The flues have at least one wall'ad jacent the drying chamber and are made of material which is highly refractory and having a high thermal conductivity such' as silicon carbide or fused aluminum oxide or equivalent materials.

I If desired, by means of suitable dampers or by the orlgmal building construction 0 the furnace, I may ass the roducts of combustion upwardly t rough t e drying chamher and driy the material by convection'heat 1ng. Or may pass the products of combustion through a heat interchanger and pass the air so heated drying chamber. v.

My invention will be more readily understood from the following description and drawings, in-which:

upwardly through the Figure 1 is avertlcal transverse section.

through the a heater.

Fig. 2 is a longitudinal section through the drier on the line 2-2 of Fig. 1 in the direction of the arrows.

' Fig. 3 is an alternative construction of the the flues. I In the illustration I provide a suitable.

supporting structure 11 on which is built afurnace designated generally by the numeral 12. This furnace has side walls 13 with suitable heat insulation and with. longitudinally extending flues or combustion chambers 14. Between the flues there is a I large drying chamber 15 extending longitudinally of the furnace and having at each end of such chamber front and back- walls 16 and 17.

The furnace is provided with burners 18 .at the front, there being a burner discharging into each flue, and at the ends of the flues there is one or more vertical collection ducts 19 for theproducts ofcombustion conconnect to horizontal ducts-j '20-I'extendin g' 'nected tdthe flues. These] vertical "ducts along each side'of the furnace and the'rearza I a plurality of openings 21 extending therey from into the-drying'chamber. .At the top of the dryingchamber there is a roof structure 22 having a stack 23 therein.

In addition to this construction'thereis an outlet connection24 leading to a heat interchanger and this outlet is controlled by an outlet control damper 25. The ducts 20 are also controlled by a damper 26.". These may be controlled in any suitable manner such as by rods and hand levers- 27. Below trolled by a discharge gate 30. Extending vertically in the'collection chamber there is a flat pipe 31 having a cover 32 at the top to prevent the material-being dried falling therein, and with openings 33 adjacent the top. As the pipe 31 extends from end to end of the drying chamber there are provided a plurality of cross-passages 34 leading into the base thereof, as indicated at 35. These cross passages are connected to of thesechambers there are a chambers 36 onthe outside of the collection chamber 28; and at the, upper end of each luralit of ducts 37 leading outwardly there rom. uc'h ducts are connected on opposite sides to manifolds 38. The manifolds are connected by a pipe 39 having a valve 40.to the heat exchanger, and a pipe 39 to the air.

The heat exchanger is designated generally by the numeral 47 in which there is a central stack 48 which connects at the bottom with the outlet connection-24. .Surrounding thisstack there is an airpassage 49 having an intake 50 at the top .and an outlet 51 at the bottom connecting to the pipe 39. Therefore when the products of combustion pass up the stack the air drawn in around the stack is heated and flows inwardly to the drying chamber through the manifolds 38.

There are man ways in which tlie material to be drie may be passed into the drying chamber and that illustrated is by tea-1t a'wimgh. te pera re-and. cs1: use material of i a; high thermal conductivity, I to form' such 'flues, a considerable m ant-pr, heat 'is radiated. causes the materia 5 n l heei s lb ul i c ed radiated: heat," l therebjgextractingfa certain amount? means of a be ejected.

In some cases it isdesired to flues outwardly from the fac eof the drying chain-T her, and thisis accomplishedas shown in: Fig. 3 in which case the heating fiues .45 are set outwardly fromthe face .46of thedrying chamber, this, in case ,ogfzanybreakage. or scaling of the flues' prevents the material, from becoming mixed with the;

materialbsing dr d-i... r

h m n er bf op t on and. functi ning of mydrierisj-substantially as-jfollows:

d nw d y: nt ih a' 'qll cfing reams combustion m assin through the flues 14 to "be dried inf desoen of molsture we ma -e 1 which a ra pipe ofiseries of pipes 41 having jets 42 through which a liquid spray may. v v A .feature of my invention is that the Various changes. :may

p g H p ing from-the spiritwther of, ,asi set'l forth in 28- 'T he ,hot 'asesfljand; otherfproductsof the descrIi 'ti' i 1. Agdrier ,comprislngjin-fcomhinati? a};

Q ith ffixeazaaes' ,in the walls thereof; said 'fiues:

material being "ra n 'fieeihsflessi edea usually turned so that air is drawn through the pipe 39"from the atmosphere, which air flowing through the manifolds 38, the pipes- 37 and the chamber 36 flows upwardly through the flattened pipe 31 and is discharged through the openings 33; thereby giving an upward current of air through .the material being dried;

If it is desired to utilize air only in the drying chamber, the products of combustion are led from the collection ducts 19 through the discharge 24 to the heat interchanger in which interchanger air is heated and passes through the pipe 39 and the manifold 40, and is discharged upwardly from the flattened pipe '31. In this case substantially. all the heating by convection is by air heated the reversal of dampers 25 and 26 none of the productsof combustion pass upwardly through the-drying chamber. I

From the above description it will be seen that I havedeveloped. a simple drying apparatus for drying materials in-the1r downward pas'sa e through a drying chamber in iant heat is utilized to a large extent in the drying, and with this I may we use the heat of convection, this heat of concvection being from the products of combustion' or air heated, thereby in a suitable heat interchanger.

.materials to be treated drop freely by grav-: ity in the drying chamber and do not come in contact with the surfaceof the flues from,

whichthe radiant heat is radiatedand there,

is no intermediary structure between the; material to .betreated and these heat radiat' viou's by my construction that my plantmay 5 tio ns, as )well .as dryingtv .be utilized for. calcining or similar-opera. As ovementiq ed .the material ,to be] dried is fed into thegdrier. above the, drying; chamber in ny suitable manner and ,"drops principles .offmy invention without departl wi g's j and. aclaim structure having a. {drying chamber-.9

ein m a a. ensvepas a e i l Ito bedrieddownwardlythrou hsaidcham.

. to Sales- 11:0

ibe a. I

tively pass said gases upwardly through the -material or pass said gases to a heat interchanger and pass the hot air from said heat interchanger upwardly through the drying' having high thermal conductivity, there be ing collection ducts at the end of said flues and horizontal ducts connected to said collection ducts, there being openings from the horizontal ducts to the said chamber, means to pass material to be dried downwardly through the chamber, said material being subjected to heat of radiation from the flues and to heat of convection by the gases passing through the flues.

3. A drier, as claimed in claim 2, an outlet connection from the collection ducts to a heat interchanger and means to selectively pass the hot gases from the flues to said eat interchanger, and means to pass air from the heat interchanger through the material to be dried.

4. A drier comprising in combination a structure having a drying chamber extending vertically therethrough with fixed flues running lengthwise of the walls of said chamber, said flues being adapted to carry products of combustion, said structure having ducts, passages and openings connected to the flues to discharge the products of combustion into the drying chamber, and means to pass material to be dried downwardly through said chamberout of contact with said flues, a collection receptacle at the base of the drying chamber, said receptacle having an elongated flat pipe extending upwardly therethrough, means to pass products of combustion from the flues to a heat interchanger, and means to pass air from the heat upwardly interchanger upwardly through the said 5 The method of drying comprising passing material to be dried downwardly, subjecting said material to radiant heat derived directly 'from gaseous products of combustion, selectively passing the products of combustion upwardly through said material or heating an by said products of combustion, and passing the heated air upwardly through said material to heat the material by the heat of convection.

6. A drier comprising in combination a structure having a vertical drying chamber with fixed flues in the walls thereof, said flues conveying hot gases along the walls, means to pass materlal to be dried downwardly through the said chamber, but out of contact with the flues, such chamber being subjected directly to heat of radiation from the flues, a heat exchanger, means to convey hot gases from the flues to the exchanger, and .means to flow air from the heat exchanger upwardly through the chamber, whereby the material is subjected to the heat of convection.

I 7. A drier comprising in combination a structure having a drying chamber with fixed flues in the walls thereof, said flues conveying hot gases, means to pass materials to be dried downwardly through the said chamber but out of contact with the flues, said material being subjected directly to heat of radiation from the flues, a passage having openings to the lower part of the chamber and connecting to the flues, a heat exchanger connected to said passage, the heat exchanger having an air connection to the drying chamber below the flues, and means to selectively direct the hot gases through the said passage into the drying chamber or through the heat exchanger.

In testimony whereof 'I have signed my name to this specification.

WILLIAM T. MORIN.

Images