CA1246407A - Pre-heater - Google Patents
Pre-heaterInfo
- Publication number
- CA1246407A CA1246407A CA000489199A CA489199A CA1246407A CA 1246407 A CA1246407 A CA 1246407A CA 000489199 A CA000489199 A CA 000489199A CA 489199 A CA489199 A CA 489199A CA 1246407 A CA1246407 A CA 1246407A
- Authority
- CA
- Canada
- Prior art keywords
- tank
- preheater
- water
- steam
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B13/00—Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body
- F22B13/04—Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body mounted in fixed position with the boiler body disposed substantially horizontally
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B9/00—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body
- F22B9/10—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
- F22B9/12—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber the fire tubes being in substantially horizontal arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
Abstract
A B S T R A C T
An industrial oven, including the combination of a steam generating tank having a water inlet and a steam outlet; walls depending from said tank for defining a combustion chamber therebelow; a preheater associated with one of the said walls exteriorially of said combustion chamber and having a water inlet therein and a water outlet thereof; said preheater water outlet communicating with said tank water inlet, means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank; and means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
An industrial oven, including the combination of a steam generating tank having a water inlet and a steam outlet; walls depending from said tank for defining a combustion chamber therebelow; a preheater associated with one of the said walls exteriorially of said combustion chamber and having a water inlet therein and a water outlet thereof; said preheater water outlet communicating with said tank water inlet, means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank; and means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
Description
~L2~ 637 _ . . ..
This ~nvention relates to an ~mproved ~team generator and more particularly to ~he use of ~ preheater or heat ex-ch~nger in combination with the steam generatorD with particular application to ~ndustrial ovens.
Heat exchangers are commonly used ~o transfer heat from one region to another.
For example U.S.P. No. 227,334 di closes the use of an .~Lu shaped water back or heat exchanger which is equipped with a cold water pipe and a ho~ water pipe. The water back ~s placed adjacent an oven and water passing from the cold water pipe into the water back is heated from the transfer of heat energy from the oven to the water back, and exits the hot water pipe.
Moreover, various e~forts have been made in order to max~mlze the extn~ctlon of heat energy from a heat source by utll~z~ng heat exchangers as di 5cl osed ~n U.S.P0 No. 4 9 392,455, 4,403,573, 3,1D4,651, and 1,026,753.
U.S.P. No. 4,392~455 discloses a water heater system having a heat s~nk modual or heat exchanger that can be easily attached to an external wall of a wood-burning stove to transfer 6~
heat from the s~ove ~o wa~er ~lowing ~hrough the modual to preheat water for subsequent household use.
In another arrangement disclosed ~n Un~ted States Patent No. 4,4039573 a heat exchanger is ~i~ted to ~he exterior ~all of a wood-burning stove and connected in combination with a tank of wa~er to be heated thereby.
U.S.PO No. 3,104,651 teaches ~he use of an auxilliary 10 hot water heater which ~s supported within a fire chamber and surmounted by ~ wa~er leg conta1ning water to be heated by the fire chamber. The auxilliary heater absorbs heat energy faster than the ~nner surfaces of the water leg so as to more rapidly heat the water within the auxill~ary water heater.
Furthermore, U.S.P. No. 1,026,762 discloses the use of a chamber which is formed integrally wlth the walls of the fuel and combustion chamber for heating water ~or household use.
Industrial ovens may also utilize a combustlon chamber as a sourre of heat energy for cook~ng food products. More part~cularly a gas-f~red ste~m generatlng oven usually comprises a boiler, combust~on chamber and a heat energy source such as gas burner tubes. The bo11er contuins water which absorbs heat energy from the combusted gases 1n the combust~on chamber ~nd converts the water ~nto steam.
Yarious efforts have been made to maximize the extraction of heat energy to vaporize the water into steam, ~ncluding the use of coiled copper heat exchangers in the combust~on chamber or wi~hin ~he boiler. Such combina~ions present complioated and expensive arrangements.
Moreover fresh water introduced into the boiler to replace the spent water oonverted in~o ~team~ drops ~he temperature of the wa~er mixture and also ~he s~eam pressure, 10 unti1 the temperature of the water mix~ure once again reaches the boiling point. Inefficiency in cooking results from this drop in steam pressure.
Furthermore, this drop in steam pressure in the boiler causes the walls of ~he boiler to contract inwardly until the steam pressure once again builds up to its normal operating steam pressure; at which point the walls of the boiler expand outwardly. This cyolical inward and outward expansion of ~he bo~ler walls, or "flexing" of the boiler walls tends to fatigue 20 and weaken the boiler, partlcularly when the boiler walls are welded together.
Stayrods9 which are metallio rods spanning the ~nterior cav~ty of the boiler and welded to opposlte walls thereof, have been used to absorb the flexing stresses of the walls, so as to strengthen and r~gidify the bo~ler. However~
over prolonged usage, even the stayrods fail, as for example, ~2~
breakage of ~he wel d between ~he stayrod and the walls of the boiler.
~ c~ ~} ~E I~IE~
The pri ncipal object of this ~nven~ion is to provide a ~ore eff~c{ent steam generating boiler which is less likely to fa~l in ~ts proper performance.
More particularly9 it ls an objec~ of th~s invention to limit the number of required components ~o a minimum, and to arrange the components in a manner so as to improve the heat energy efficiency of the boiler.
FEATURES OF THE I~ENTION
. . _ , , One aspect of this ~nvention resides in an industrial oven, including the eombinat~on of a steam generating tank ha~ing a wa~er ~nlet and a steam ou~let; walls depending from 20 sa~d tank for defining a combustion chamber therebelow; a preheater assoo1ated w~th one of the said walls exteriorially of sa~d combustion chamber ~nd havlng ~ water inlet therein and a water outlet thereof; sa~d preheater water outlet communicating ~lth said tank water ~nlet; means for generating heat energy w~thin said combust~on chamber so as to preheat water within s~ld preheater ~nd generate steam from water wi~h~n said tank;
and means for controlling the 1ntroduct~on of water ~nto said pr~heater and ~n~o sa~d tank so as to m1nim~ze the drop of ~ 4 o ~ ~ ~ 6 steam pressure ~n sa~d tank dur~ng introduction o~ water int~
said tank.
DESCRIPTlON OF THE DRA~I~6S
These and o~her objec~s and fea~ures are illus~rated and described in the follow~ng specification to be read in con-~unction with ~he sheets of drawings in which:
10 Figure 1 is a part~al cross sectional view of th~ gas fired steam generator ill ustrati ng the use of the prehea~er.
Figure 2 is an exploded view of the steam generating tank.
Figure 3 is a perspective view of the steam generating tank.
Figure 4 is an exploded view of the preheater.
DESCRIPTION OF THE INVENTION
___ ~0 Identical parts have been giYen 1dentical numbers throughout the fiyures.
Figure 1 illustrates ~n industr~al ov2n 2 wh~ch rests on legs 3 and has front and back walls 4 ~which co~pr~ses of 4a and 4b as descrlbed herein) and 6 respectively, and side walls 8 and 10.-The industrial oven includes preheater 100 and a steamgenerating tank or boiler 12 which is used to generate steam 14 from water 1~ located in the tank 12.
Gas burner tubes lB are u~ zed to generate heat energy ~n ~he chamber 11 which is bounded by front and back walls 4 and 6 respectively, and side walls 8, and 10 respec-ti~ely. The heat energy in the combus~ion chamber 11 raises the temperature of the tank 12, the preheater 100, and the water 16.
The heat exhaust 19 escapes through two rows of exhaust tubes 64 which run through the ~ank 12 and assist in heating the water 16 for the generation of steam 14.
Steam 14 exits through opening 87 and ~s then directed to the cooking areas of the stove (not shown) in order to cook food products.
A liquid level oontrol device 140 is also utilized to 20 maintain the lcYel of water in the tank 12 be~ween prede~ermined levels LMAX and LMIN in a manner which i5 more fully par~i-cular~zed in Canadian Patent Application No. 479644, filed April 19, 1985; but which shall be generally described herein in relat~on to describing the operation of the preheater.
The construction of the generator 12 may be best described by reference to Figures 2 and 3.
.
The generator is fabricated from two p~eces of sheet metal panels 22 and ~0. In particular, a piece of sheet metal 22 ~s bent ~n a suitable breaking machine or the like (not shown) at bends 24~ 2S, 28, 3G, 32 and 349 so ~s to form the face panels 36, 38 and 40, lower panels 427 44, 46 and rear panel 48 of boiler 12. The panels 36, 42, 389 44 and 40 have been bent generally perpendicular to one another so as to define a stepped configuration. A second piece of sheet ~ tal 50 is bent in a suitable breaking machine or the like (not shown) at 10 bends 52 and 54 so as to produce ~op panel 56 and side panels 58 and 60. Top panel ~6 is generally bent perpendicular to side panels 58 and 60.
The bent shee~ metal panels 22 and 50 are then arranged so that sheet metal panel 50 is pldced over shee~ metal panel 22 and best illustrated in Figure 3, and thereby form an enclosure or boiler 12. Panel 22 ~5 welded to panel SO along the connec~ng seams 62 as to produce a watertight enclosure or generator tank 12.
The generator tank 12 lncludes exhaust tubes 64 which run along the length of the generator 12 in two rows as illus-trated in F~gures 1, 2 and 3.
One row of exhaust tubes 64 commence from one of the panels 38 to the rear panel 48; and the other row of exhaust tubes 64 commence from the panel 40 to the rear panel 48.
~ 7 The panels 38 and 40 and rear panel 48 present two rows of aligned holes ~6 for receiving the ends of ~he exhaust tubes 64. The holes 66 may be formed in the sheet ~etal panel
This ~nvention relates to an ~mproved ~team generator and more particularly to ~he use of ~ preheater or heat ex-ch~nger in combination with the steam generatorD with particular application to ~ndustrial ovens.
Heat exchangers are commonly used ~o transfer heat from one region to another.
For example U.S.P. No. 227,334 di closes the use of an .~Lu shaped water back or heat exchanger which is equipped with a cold water pipe and a ho~ water pipe. The water back ~s placed adjacent an oven and water passing from the cold water pipe into the water back is heated from the transfer of heat energy from the oven to the water back, and exits the hot water pipe.
Moreover, various e~forts have been made in order to max~mlze the extn~ctlon of heat energy from a heat source by utll~z~ng heat exchangers as di 5cl osed ~n U.S.P0 No. 4 9 392,455, 4,403,573, 3,1D4,651, and 1,026,753.
U.S.P. No. 4,392~455 discloses a water heater system having a heat s~nk modual or heat exchanger that can be easily attached to an external wall of a wood-burning stove to transfer 6~
heat from the s~ove ~o wa~er ~lowing ~hrough the modual to preheat water for subsequent household use.
In another arrangement disclosed ~n Un~ted States Patent No. 4,4039573 a heat exchanger is ~i~ted to ~he exterior ~all of a wood-burning stove and connected in combination with a tank of wa~er to be heated thereby.
U.S.PO No. 3,104,651 teaches ~he use of an auxilliary 10 hot water heater which ~s supported within a fire chamber and surmounted by ~ wa~er leg conta1ning water to be heated by the fire chamber. The auxilliary heater absorbs heat energy faster than the ~nner surfaces of the water leg so as to more rapidly heat the water within the auxill~ary water heater.
Furthermore, U.S.P. No. 1,026,762 discloses the use of a chamber which is formed integrally wlth the walls of the fuel and combustion chamber for heating water ~or household use.
Industrial ovens may also utilize a combustlon chamber as a sourre of heat energy for cook~ng food products. More part~cularly a gas-f~red ste~m generatlng oven usually comprises a boiler, combust~on chamber and a heat energy source such as gas burner tubes. The bo11er contuins water which absorbs heat energy from the combusted gases 1n the combust~on chamber ~nd converts the water ~nto steam.
Yarious efforts have been made to maximize the extraction of heat energy to vaporize the water into steam, ~ncluding the use of coiled copper heat exchangers in the combust~on chamber or wi~hin ~he boiler. Such combina~ions present complioated and expensive arrangements.
Moreover fresh water introduced into the boiler to replace the spent water oonverted in~o ~team~ drops ~he temperature of the wa~er mixture and also ~he s~eam pressure, 10 unti1 the temperature of the water mix~ure once again reaches the boiling point. Inefficiency in cooking results from this drop in steam pressure.
Furthermore, this drop in steam pressure in the boiler causes the walls of ~he boiler to contract inwardly until the steam pressure once again builds up to its normal operating steam pressure; at which point the walls of the boiler expand outwardly. This cyolical inward and outward expansion of ~he bo~ler walls, or "flexing" of the boiler walls tends to fatigue 20 and weaken the boiler, partlcularly when the boiler walls are welded together.
Stayrods9 which are metallio rods spanning the ~nterior cav~ty of the boiler and welded to opposlte walls thereof, have been used to absorb the flexing stresses of the walls, so as to strengthen and r~gidify the bo~ler. However~
over prolonged usage, even the stayrods fail, as for example, ~2~
breakage of ~he wel d between ~he stayrod and the walls of the boiler.
~ c~ ~} ~E I~IE~
The pri ncipal object of this ~nven~ion is to provide a ~ore eff~c{ent steam generating boiler which is less likely to fa~l in ~ts proper performance.
More particularly9 it ls an objec~ of th~s invention to limit the number of required components ~o a minimum, and to arrange the components in a manner so as to improve the heat energy efficiency of the boiler.
FEATURES OF THE I~ENTION
. . _ , , One aspect of this ~nvention resides in an industrial oven, including the eombinat~on of a steam generating tank ha~ing a wa~er ~nlet and a steam ou~let; walls depending from 20 sa~d tank for defining a combustion chamber therebelow; a preheater assoo1ated w~th one of the said walls exteriorially of sa~d combustion chamber ~nd havlng ~ water inlet therein and a water outlet thereof; sa~d preheater water outlet communicating ~lth said tank water ~nlet; means for generating heat energy w~thin said combust~on chamber so as to preheat water within s~ld preheater ~nd generate steam from water wi~h~n said tank;
and means for controlling the 1ntroduct~on of water ~nto said pr~heater and ~n~o sa~d tank so as to m1nim~ze the drop of ~ 4 o ~ ~ ~ 6 steam pressure ~n sa~d tank dur~ng introduction o~ water int~
said tank.
DESCRIPTlON OF THE DRA~I~6S
These and o~her objec~s and fea~ures are illus~rated and described in the follow~ng specification to be read in con-~unction with ~he sheets of drawings in which:
10 Figure 1 is a part~al cross sectional view of th~ gas fired steam generator ill ustrati ng the use of the prehea~er.
Figure 2 is an exploded view of the steam generating tank.
Figure 3 is a perspective view of the steam generating tank.
Figure 4 is an exploded view of the preheater.
DESCRIPTION OF THE INVENTION
___ ~0 Identical parts have been giYen 1dentical numbers throughout the fiyures.
Figure 1 illustrates ~n industr~al ov2n 2 wh~ch rests on legs 3 and has front and back walls 4 ~which co~pr~ses of 4a and 4b as descrlbed herein) and 6 respectively, and side walls 8 and 10.-The industrial oven includes preheater 100 and a steamgenerating tank or boiler 12 which is used to generate steam 14 from water 1~ located in the tank 12.
Gas burner tubes lB are u~ zed to generate heat energy ~n ~he chamber 11 which is bounded by front and back walls 4 and 6 respectively, and side walls 8, and 10 respec-ti~ely. The heat energy in the combus~ion chamber 11 raises the temperature of the tank 12, the preheater 100, and the water 16.
The heat exhaust 19 escapes through two rows of exhaust tubes 64 which run through the ~ank 12 and assist in heating the water 16 for the generation of steam 14.
Steam 14 exits through opening 87 and ~s then directed to the cooking areas of the stove (not shown) in order to cook food products.
A liquid level oontrol device 140 is also utilized to 20 maintain the lcYel of water in the tank 12 be~ween prede~ermined levels LMAX and LMIN in a manner which i5 more fully par~i-cular~zed in Canadian Patent Application No. 479644, filed April 19, 1985; but which shall be generally described herein in relat~on to describing the operation of the preheater.
The construction of the generator 12 may be best described by reference to Figures 2 and 3.
.
The generator is fabricated from two p~eces of sheet metal panels 22 and ~0. In particular, a piece of sheet metal 22 ~s bent ~n a suitable breaking machine or the like (not shown) at bends 24~ 2S, 28, 3G, 32 and 349 so ~s to form the face panels 36, 38 and 40, lower panels 427 44, 46 and rear panel 48 of boiler 12. The panels 36, 42, 389 44 and 40 have been bent generally perpendicular to one another so as to define a stepped configuration. A second piece of sheet ~ tal 50 is bent in a suitable breaking machine or the like (not shown) at 10 bends 52 and 54 so as to produce ~op panel 56 and side panels 58 and 60. Top panel ~6 is generally bent perpendicular to side panels 58 and 60.
The bent shee~ metal panels 22 and 50 are then arranged so that sheet metal panel 50 is pldced over shee~ metal panel 22 and best illustrated in Figure 3, and thereby form an enclosure or boiler 12. Panel 22 ~5 welded to panel SO along the connec~ng seams 62 as to produce a watertight enclosure or generator tank 12.
The generator tank 12 lncludes exhaust tubes 64 which run along the length of the generator 12 in two rows as illus-trated in F~gures 1, 2 and 3.
One row of exhaust tubes 64 commence from one of the panels 38 to the rear panel 48; and the other row of exhaust tubes 64 commence from the panel 40 to the rear panel 48.
~ 7 The panels 38 and 40 and rear panel 48 present two rows of aligned holes ~6 for receiving the ends of ~he exhaust tubes 64. The holes 66 may be formed in the sheet ~etal panel
2~ prior to bending as descr~bed above. Af~er the panel 22 is bent to the appropriate shapeg the exhaust tubes 64 may ~hen be ~nsert2d through the holes 66, and the ends of the tubes 64 welded to the panels 38 and 40 and rear panel 48 respectively so as to produce a watertight enclosure or generator 12. The exhaust tubes 64 are hollow and permit ~he exhaus~ gases 19 to 10 pass therethrough.
Stayrods 68 run vertically through the generator 12 from me~al panel 22 ~o me~al panel 50. The panels 22 and 50 present a series of aligned holes 70 which are adapted to receive the ends of the stayrods 68, and the ends of the stayrods are welded to panel 50 and panel ~2. The holes 70 may be formed in the panels 50 and 22 prior to bending, as described above.
A second set of s~ayrods 72 run horizon~ally from front panel 36 ts rear panel 4a ~nd are generally perpendicular to the first set of stayrods 68. Aga1n, panel 22 presents a ser~es of holes 74 in panel 36 and re~r p~nel 48, which are ~dapted to rece~ve the ~nds of the stayrods 72. The ends of the stayrods 72 are welded to panels 36 and 48. The holes 74 may be formed in panel 22 prior ~o bending.
~ 3~
The stayrods 68 and 72 have been included to rigidify the structure of the generator 12.
The face panel 36 lncludes an opening 76 as bes~ seen ~n Figure 1 and 3 for permitting en~ry into the genera~or 12 for cleaning. An o~al collar 77 is welded to the face panel 36 wlthin the confines of the opening 76 as best illustrated in Figure 1. The opening 76 may be closed by a cover 78 which is adapted to bear agains~ the inside portion of ~he collar 77 10 within the tank 12 as the cover 78 ~s sligh~ly larger in extent than the collar 77 and opening 76. Cover 78 also presents a threaded post 80 which ;s adapted to receive locking bar 82 and nut 84. The length of locking bar ~2 is slightly larger than the collar 77 and opening 76 so tha~ when nut 84 is tigh~ened, the cover 78 is forced against ~he inside surface of the collar 77 ln a manner so as to effect a watertight seal. A silcone gasket 79 is presented between the collar 77 and cover 78.
The generator 12 also includes a water inlet 86 and a 20 steam outlet 87.
Legs 90 and 88 are attached to the front panel 36 and back panel 48 respect~Yely by welding or other suitable means.
Legs 8R and 90 support the tank 1~. The legs ~8 ~nd 90 are connected by members 92.
Preheater 100 is adap~ed to be fastened ~o the legs 90 as best seen in Flgures 1 snd 3. A front plate 4b is also _ g _ t~ed to be fastened to legs 90 ~us~ below the preheater 100 ~5 ~ st sPen in Figur2s 1 and 3.
A generally "L" shaped back wall 6 is ~dap~ed ~o be ned to the legs B8 as best seen in Figure 1 and 3O
5 for panel The side wall 8 ~s a~tached to ~he boiler as best seen ~n Figure 39 whereby a horizontal s~rip of sheet metal 94 is welded to the panel 58 along the leng~h of the generator 12 as 10 seen in Figure 3. The metal strip 94 projects outwardly of the b~ r and approximately perpendicular to the surface of panel ~rOThe side wall 8 is then fastened by clips or other means to trip of sheet me~al 94 at one end thereof and fastened by c~ or other means to the member 92 at the o~her end thereof~
9~ a manner so that the side wall 8 is rem~vable from the strip sheet metal g4 and member 92 for either cleaning or replacing.
S~dewall 10 ~s similarly removably fastened by clips 20 o~r~e like to a second horizontal str~p of sheet metal 96 at ~d~nd thereof, and to the member 92 at the other end thereof.
;~bQlstrip of sheet metal 96 ~s welded to the other panel 60 along the length of the generator.
e pre It will also be apparent from Figure 1 that ~he ~ad~trial oven 2 also presents outer t~p panel 117 and ou~er front and rear panels 91 and 93. The outer top, front and rear panels 117, 91 and 93 respect~vely are usually fabrica~ed from ~2~
stainless stPel for asthetic reasons. The front panel 91 presents a swingable door ~or entering into ~he industrial oven .
A flue panel 113 is spaced ou~wardly from rear panel 6 so as to present a flue chamber 95 for the exhaust ~ases 19 to exit therein. The outside rear panel 93 is spaced outwardly from the flue panel 113.
Furthermore, the outside front panel 91 also presents a series of control knobs 97 to con~rol the indus~rial oven as well as the cooking area all in the manner well known in the art. Outside front panel 91 is spaced outwardly from front panel 4 so as ~o present a space 99. The control knobs 97 are attached to wires and control elements ~9 whlrh are situated in space 99.
The industrial oYen also presents outside side panels tnot shown) which are spaced from side walls 8 and 10 and are usually fabr~cateo from stainless steel for asthet~c reasons.
The preheater 100 shall now be descr~bed w~th reference ~o F~gures 3 and 4. The preheater 100 ls located in space 99 between front wall 4 and outs~de front panel 91~
~ 2 ~6 ~ ~
The preheat,er 100 is generally a rectangular enclosure which is fabricated from metal panels 102~ 4a, 106 and 108.
Metal panel 102 is bent in a breaking machine or the l~ke (not shown) at bends 110 and 112 so as to presen~ a front portion 114 and two side portions 116. One of the side portions 116 is longer th~n the other to seal the combustion chamber 11 in a ~anner to be par~icularized her in.
The preheater 100 also presents back portion 4a which is generally rec~angular in top plan Yiew so as to fi~ snuggly between the side panels 116. The length of the bottom portion 4a is slightly greater than the length of the ~op portion 114 so as to present two flanges 118 as best seen in Figure 3. The bo~tom portion 4a is then welded to the side portion 116 alnng the connecting seam thereof.
The preheater 100 presents two end panels 106 and 108 which are dimensioned so as to fit snuggly between ~he bottom 20 portlon 4a, and side ~nd top portions 116 and 114, and are welded thereto along the connecting se~m thereof so as to present a watertight enclosure. End panel 108 conta~ns 2 holes 101 and 103 which are dimenslonal to receive preheater out1et tube 105 and preheater ~nlet tube 107. Preheater outlet 105 and ~nlet 107 ~re welded to end panel 108.
The preheater 100 ~lso cont~ins stayrod 120 projecting through the encl~sure gener~lly parallel to and equally spaced from s~de panels 116. The top porti~n 114 and bottom portion 4apresent al~gned holes 122 for receivlng ~he ends o~ the s~ayrod 120. The ends o~ the stayrod 120 are ~hen welded to the outside surface of the tQp portion 114 and bottom portion 4a. The stayrod 120 has been included ~o rigidi~y ~he preheater 100.
Any number of stayrods 120 may be utilized as required.
The preheater 100 is connec~ed ~o the 1 egs 90 as seen in Figures 1 and 3. In particular, the preheater 100 is 10 disposed so that the longer side portion 116 contacts and overlaps panel 42 so that the combustion gases vent out ~he exhaust tubes 64 rather than between ~he preheater 100 and panel 42. The longer length of the side por~ion 116 which overlaps the panel 42 tends to create a seal to the flow of combustion gases even if a small gap davelops between the side portion 116 and panel 42 as the combusti on gases wi 11 vent through the path of least resistance through the exhaust tubes 64 rather than the path of higher resistance created by the longer leng~h of side portion 116.
~0 The flange 118 of preheater 100 presents holes 124 for rece~ving fasteners. Legs 90 also presents corresponding holes (not ~ls~ble) wh~ch al~gn w~th holes 124. The holes 124 are adapted to receive f~steners such as bolts and nuts 12S to a~tach preheater 100 to legs 90. Accordingly, the preheater 100 may be securely f~stened, or removed from the legs 90 by t~ghten1ng or loosen1ng the nuts and bolts 126.
In the preferred embodiment ~llustrated the b~ttom portion 4a of preheater 100 and the front plate 4b cooperate so ~s ~o de~ine the front wall 4 illus~rated ~n Figure 1.
Furthermore, the preheater 100 ~s a par~ o~ the ~all 4 which defines the combustion chamber 11. However in another embodiment of this ~nvention i~ ~s possible to attach a front wall 4 directly ~o the legs 90 and attach the preheater 100 as described to the ~ront wall 4 in heat exchange relationship without departing from the spirit of this lnvention.
The preheater 100 is lo&ated in space 99 in ~he region adjacent the electrical controls 89. Fur~hermore, the preheater 100 ~s located in the region facing the panels 42, 38, 44 and 40. which present B stepped configuration.
During the normal operation of the generator 12, water 16 is introduced at tap pressure (approxmiately 70 lbs. pres-sure) through piping 128 into the preheater inlet 107. When the preheater 100 is full of water 16, water 16 will flow from the 20 preheater outlet 105 through piping section 130, which is located exteriorally of side w~ll 8 and in par~cular exteriorally of chamber 11, ~nto the bo~ler ~nlet 86. The wa~er 16 will then fill the generator 12 unt11 the water 16 reaches thetmaximum level of LMAX
The level of the water ~n the generatcr 12 ~s con-trolled by the use of the float v~lve control 140, the operation of ~h1ch ls spec~ically o~tl~ned ~n Can~dlan Pat~nt Application No. 479644, file~ April 19, 1985. The float valve control 140 i 5 attached to the water side of the boi l er 12 ~y means of piping 142 and to ~he vapour side of boiler by means of piping 144.
The float valve con~rol 140 comprises a cylindrical glass enclosure 146 which contains a magnetic float system 148.
The float YalYe control 140 is adapted to receive water within the cylindrical glass enclosure through plping 142. Further-10 more, the piping section 144 also communica~es with the cylin-drical glass enclosure 146. Therefore, the level o~ the water 16 in the float valve control 140 corresponds to the level in the generator 12.
Once ~he level of the water lfi ~n the generator 12 reaches LMAX, an elec~rical signal is emitted through wires 150 to solenoid valve 152 so as to shut o~f the supply of water 16.
As the gas burns 1n the combustion chamber 11, the 20 temperature of the chamber 11 and the bo~1er 12 also rises, whtch ralses the temperature of the water l 6 i n the generator 12, and thereby produces steam 14.
The temperature of the front wal l 4 wi 11 al so r~se, s~nce the preheater 100 ~s located adjacent the frnnt wall 4.
The temperature of the preheater 100 ~nd the water 15 loca~ed t~ere~n will also r~se as a result of heat transfer. It is poss~ble that the temperature of the water 16 ~n preheater 100 : ~ 15 -may rise so as ~o produce s~eam 14 ~n preheater 100. Such generation of steam w~ll, however, Yent ~hrough pipe 130 and intD boiler 12.
The stepped configuration o~ the panels 423 38, 44 and 40 assist in localizing hea~ energy in the combustion chamber 11 ~n the region adjacent the preheater 100. Accordingly, ~he tem-perature of the water 16 ~n the preheater 100 will rise. There ls therefore a greater efficiency ~n the u~iliza~ion of h~at 10 energy as n~t only is ~he heat energy from the combustion gases utilized to generate steam from water 1~ in generator 12, but also to preheat water 16 in the preheater 100.
With~ut the use of preheater 100, it was necessary to ~nclude insulating materials in space 9 adjacent the electrical controls 89 so as to prevent the electr~cal controls 89 from overheating. However, with the use of the preheater ~n the reg~on adjacent the electrical controls 89~ the electrical controls tended not to overheat, even without the insulation, as 2~ the tap water in the preheater 100 absorbs the heat energy as a~oresaid.
The steam 14 is produced in the boiler 12 at a pressure of approximately 14 lbs, pressure. As water 16 is con~erted ~nto steam 14 1n generator 12, the w~ter level falls unt~l lt reaches LMIN. When the water le~el reaches LMIN, the float contrnl valve 140 emits an electr~cal signal through wires ~ 16 -150 to solenold Yalve 152~ causing ~he valve ~o ~n~roduce tap water into the preheater 100.
The water inlet 107 of preheater 100 1s below the water outlet 105. Since hot water rises, the tap water introduced lnto preheater 100 will force the hot water ~hrough the outlet 105 into the boiler inlet 86. The water 16 lntroduced ~nto the generator 12 has been preheated by preheater 100 and accordingly the temperature of the water 16 1ntroduced 10 into ~he boiler approximates the temperature of the water 16 in the boiler 12. Upon mixlng of ~he introduced water, the overall temperature of the water 16 in the genera~or 12 will stay relatively constant.
For example, in one partlcular application a generator t2 was utili~ed to generate steam at 14 lbs. pressure. Without the utillzat~on of the preheater 100, tap water introduced dlrectly ~nto the generator 12 resulted in a pressure drop to 4 lbs. pressure, as the water m~xture dropped the temperature 20 below the boil~ng temperature of water.
Upon util~z~ng the preheater 100 descr~bed herein, ~t was found that when the tap water was prehea~ed ~n the preheater lOO ~nd then lntroduced ~nto the bo~ler 12, there was relatively 1~ttle change ~n the steam pressure as the pressure ~n the bo~ler fell momentar~ly to 12 lbs. pressure and qu1ckly returned to~l4 lbs. pressure.
Such a result lncreases ~he cooking efficiency of the industrial oven 2 as ~he cooking pressure is main~ained rela-tively constant with l~ttle fluctuation.
Moreover, ~he relatively constant pressure of steam wh~ch resul~s from the use of the preheater 40 increases the l~fe of the boiler 12 as the flexing stresses in the bo~ler are m~nimlzed, thereby minimizir,g ~he s~resses which must be borne by the stayrods and welds.
Once the water level ~n the boiler 12 reaches LMAX ~he float control ~alve 140 shuts off the flow of tap water into preheater 100 as descrlbed. The float valve control 140 may also shut off ~he flow of gas to gas burner tubes 18 by generating a signal ~o the valve 154 through wires 156 in the eYent that the water level falls before the safety LSAFETy.
A steam separator 158 ~s util~zed ln the vacinity of the steam outlet 87 as best ~llustrated in Figure ~. The steam 20 separator 158 is a piece of metal whlch has been b~nt to presen~
a generally ~Lu shaped cross section, one leg of which has been welded to the lnter~or wall of panel 58 ~n ~he reg~on adjacent to steam outlet 87 as lllustrated. The steam separator 158 ~sslsts ~n preYenting the spray of boil~ng water 16 from being carr~ed off by the steam 14 ~nto the cooking ~rea, as nny spray of bo~llng water 16 ~hat h~ts the steam separator w~ll remain ln the t~nk 12. Therefore, the steam 14 ut~lized 1n the cooking ~rea (nat shown) ls relatively free of water 16. Furthermore, ~ 7 it has been found that less tap water is used with the steamseparator 158. This increases the efficiency of the boiler 12 ~s the boiler 12 will not need to be "f~lled up" as many times, again minimizing ~he flexing action as described above, and thereby prolonging the useful life of the boiler and the welds.
Although the preferred embodiment as well as the operation and use has been specifically described in relation to the drawings~ it should be understood ~hat variations in the 10 preferred embodiment ~ould easily be achieved by a man skilled in the ~rt without departing from the spirit of the invention.
Accordingly, the invention should not be understood to be l~mited to the exact form revealed by the drawings.
Stayrods 68 run vertically through the generator 12 from me~al panel 22 ~o me~al panel 50. The panels 22 and 50 present a series of aligned holes 70 which are adapted to receive the ends of the stayrods 68, and the ends of the stayrods are welded to panel 50 and panel ~2. The holes 70 may be formed in the panels 50 and 22 prior to bending, as described above.
A second set of s~ayrods 72 run horizon~ally from front panel 36 ts rear panel 4a ~nd are generally perpendicular to the first set of stayrods 68. Aga1n, panel 22 presents a ser~es of holes 74 in panel 36 and re~r p~nel 48, which are ~dapted to rece~ve the ~nds of the stayrods 72. The ends of the stayrods 72 are welded to panels 36 and 48. The holes 74 may be formed in panel 22 prior ~o bending.
~ 3~
The stayrods 68 and 72 have been included to rigidify the structure of the generator 12.
The face panel 36 lncludes an opening 76 as bes~ seen ~n Figure 1 and 3 for permitting en~ry into the genera~or 12 for cleaning. An o~al collar 77 is welded to the face panel 36 wlthin the confines of the opening 76 as best illustrated in Figure 1. The opening 76 may be closed by a cover 78 which is adapted to bear agains~ the inside portion of ~he collar 77 10 within the tank 12 as the cover 78 ~s sligh~ly larger in extent than the collar 77 and opening 76. Cover 78 also presents a threaded post 80 which ;s adapted to receive locking bar 82 and nut 84. The length of locking bar ~2 is slightly larger than the collar 77 and opening 76 so tha~ when nut 84 is tigh~ened, the cover 78 is forced against ~he inside surface of the collar 77 ln a manner so as to effect a watertight seal. A silcone gasket 79 is presented between the collar 77 and cover 78.
The generator 12 also includes a water inlet 86 and a 20 steam outlet 87.
Legs 90 and 88 are attached to the front panel 36 and back panel 48 respect~Yely by welding or other suitable means.
Legs 8R and 90 support the tank 1~. The legs ~8 ~nd 90 are connected by members 92.
Preheater 100 is adap~ed to be fastened ~o the legs 90 as best seen in Flgures 1 snd 3. A front plate 4b is also _ g _ t~ed to be fastened to legs 90 ~us~ below the preheater 100 ~5 ~ st sPen in Figur2s 1 and 3.
A generally "L" shaped back wall 6 is ~dap~ed ~o be ned to the legs B8 as best seen in Figure 1 and 3O
5 for panel The side wall 8 ~s a~tached to ~he boiler as best seen ~n Figure 39 whereby a horizontal s~rip of sheet metal 94 is welded to the panel 58 along the leng~h of the generator 12 as 10 seen in Figure 3. The metal strip 94 projects outwardly of the b~ r and approximately perpendicular to the surface of panel ~rOThe side wall 8 is then fastened by clips or other means to trip of sheet me~al 94 at one end thereof and fastened by c~ or other means to the member 92 at the o~her end thereof~
9~ a manner so that the side wall 8 is rem~vable from the strip sheet metal g4 and member 92 for either cleaning or replacing.
S~dewall 10 ~s similarly removably fastened by clips 20 o~r~e like to a second horizontal str~p of sheet metal 96 at ~d~nd thereof, and to the member 92 at the other end thereof.
;~bQlstrip of sheet metal 96 ~s welded to the other panel 60 along the length of the generator.
e pre It will also be apparent from Figure 1 that ~he ~ad~trial oven 2 also presents outer t~p panel 117 and ou~er front and rear panels 91 and 93. The outer top, front and rear panels 117, 91 and 93 respect~vely are usually fabrica~ed from ~2~
stainless stPel for asthetic reasons. The front panel 91 presents a swingable door ~or entering into ~he industrial oven .
A flue panel 113 is spaced ou~wardly from rear panel 6 so as to present a flue chamber 95 for the exhaust ~ases 19 to exit therein. The outside rear panel 93 is spaced outwardly from the flue panel 113.
Furthermore, the outside front panel 91 also presents a series of control knobs 97 to con~rol the indus~rial oven as well as the cooking area all in the manner well known in the art. Outside front panel 91 is spaced outwardly from front panel 4 so as ~o present a space 99. The control knobs 97 are attached to wires and control elements ~9 whlrh are situated in space 99.
The industrial oYen also presents outside side panels tnot shown) which are spaced from side walls 8 and 10 and are usually fabr~cateo from stainless steel for asthet~c reasons.
The preheater 100 shall now be descr~bed w~th reference ~o F~gures 3 and 4. The preheater 100 ls located in space 99 between front wall 4 and outs~de front panel 91~
~ 2 ~6 ~ ~
The preheat,er 100 is generally a rectangular enclosure which is fabricated from metal panels 102~ 4a, 106 and 108.
Metal panel 102 is bent in a breaking machine or the l~ke (not shown) at bends 110 and 112 so as to presen~ a front portion 114 and two side portions 116. One of the side portions 116 is longer th~n the other to seal the combustion chamber 11 in a ~anner to be par~icularized her in.
The preheater 100 also presents back portion 4a which is generally rec~angular in top plan Yiew so as to fi~ snuggly between the side panels 116. The length of the bottom portion 4a is slightly greater than the length of the ~op portion 114 so as to present two flanges 118 as best seen in Figure 3. The bo~tom portion 4a is then welded to the side portion 116 alnng the connecting seam thereof.
The preheater 100 presents two end panels 106 and 108 which are dimensioned so as to fit snuggly between ~he bottom 20 portlon 4a, and side ~nd top portions 116 and 114, and are welded thereto along the connecting se~m thereof so as to present a watertight enclosure. End panel 108 conta~ns 2 holes 101 and 103 which are dimenslonal to receive preheater out1et tube 105 and preheater ~nlet tube 107. Preheater outlet 105 and ~nlet 107 ~re welded to end panel 108.
The preheater 100 ~lso cont~ins stayrod 120 projecting through the encl~sure gener~lly parallel to and equally spaced from s~de panels 116. The top porti~n 114 and bottom portion 4apresent al~gned holes 122 for receivlng ~he ends o~ the s~ayrod 120. The ends o~ the stayrod 120 are ~hen welded to the outside surface of the tQp portion 114 and bottom portion 4a. The stayrod 120 has been included ~o rigidi~y ~he preheater 100.
Any number of stayrods 120 may be utilized as required.
The preheater 100 is connec~ed ~o the 1 egs 90 as seen in Figures 1 and 3. In particular, the preheater 100 is 10 disposed so that the longer side portion 116 contacts and overlaps panel 42 so that the combustion gases vent out ~he exhaust tubes 64 rather than between ~he preheater 100 and panel 42. The longer length of the side por~ion 116 which overlaps the panel 42 tends to create a seal to the flow of combustion gases even if a small gap davelops between the side portion 116 and panel 42 as the combusti on gases wi 11 vent through the path of least resistance through the exhaust tubes 64 rather than the path of higher resistance created by the longer leng~h of side portion 116.
~0 The flange 118 of preheater 100 presents holes 124 for rece~ving fasteners. Legs 90 also presents corresponding holes (not ~ls~ble) wh~ch al~gn w~th holes 124. The holes 124 are adapted to receive f~steners such as bolts and nuts 12S to a~tach preheater 100 to legs 90. Accordingly, the preheater 100 may be securely f~stened, or removed from the legs 90 by t~ghten1ng or loosen1ng the nuts and bolts 126.
In the preferred embodiment ~llustrated the b~ttom portion 4a of preheater 100 and the front plate 4b cooperate so ~s ~o de~ine the front wall 4 illus~rated ~n Figure 1.
Furthermore, the preheater 100 ~s a par~ o~ the ~all 4 which defines the combustion chamber 11. However in another embodiment of this ~nvention i~ ~s possible to attach a front wall 4 directly ~o the legs 90 and attach the preheater 100 as described to the ~ront wall 4 in heat exchange relationship without departing from the spirit of this lnvention.
The preheater 100 is lo&ated in space 99 in ~he region adjacent the electrical controls 89. Fur~hermore, the preheater 100 ~s located in the region facing the panels 42, 38, 44 and 40. which present B stepped configuration.
During the normal operation of the generator 12, water 16 is introduced at tap pressure (approxmiately 70 lbs. pres-sure) through piping 128 into the preheater inlet 107. When the preheater 100 is full of water 16, water 16 will flow from the 20 preheater outlet 105 through piping section 130, which is located exteriorally of side w~ll 8 and in par~cular exteriorally of chamber 11, ~nto the bo~ler ~nlet 86. The wa~er 16 will then fill the generator 12 unt11 the water 16 reaches thetmaximum level of LMAX
The level of the water ~n the generatcr 12 ~s con-trolled by the use of the float v~lve control 140, the operation of ~h1ch ls spec~ically o~tl~ned ~n Can~dlan Pat~nt Application No. 479644, file~ April 19, 1985. The float valve control 140 i 5 attached to the water side of the boi l er 12 ~y means of piping 142 and to ~he vapour side of boiler by means of piping 144.
The float valve con~rol 140 comprises a cylindrical glass enclosure 146 which contains a magnetic float system 148.
The float YalYe control 140 is adapted to receive water within the cylindrical glass enclosure through plping 142. Further-10 more, the piping section 144 also communica~es with the cylin-drical glass enclosure 146. Therefore, the level o~ the water 16 in the float valve control 140 corresponds to the level in the generator 12.
Once ~he level of the water lfi ~n the generator 12 reaches LMAX, an elec~rical signal is emitted through wires 150 to solenoid valve 152 so as to shut o~f the supply of water 16.
As the gas burns 1n the combustion chamber 11, the 20 temperature of the chamber 11 and the bo~1er 12 also rises, whtch ralses the temperature of the water l 6 i n the generator 12, and thereby produces steam 14.
The temperature of the front wal l 4 wi 11 al so r~se, s~nce the preheater 100 ~s located adjacent the frnnt wall 4.
The temperature of the preheater 100 ~nd the water 15 loca~ed t~ere~n will also r~se as a result of heat transfer. It is poss~ble that the temperature of the water 16 ~n preheater 100 : ~ 15 -may rise so as ~o produce s~eam 14 ~n preheater 100. Such generation of steam w~ll, however, Yent ~hrough pipe 130 and intD boiler 12.
The stepped configuration o~ the panels 423 38, 44 and 40 assist in localizing hea~ energy in the combustion chamber 11 ~n the region adjacent the preheater 100. Accordingly, ~he tem-perature of the water 16 ~n the preheater 100 will rise. There ls therefore a greater efficiency ~n the u~iliza~ion of h~at 10 energy as n~t only is ~he heat energy from the combustion gases utilized to generate steam from water 1~ in generator 12, but also to preheat water 16 in the preheater 100.
With~ut the use of preheater 100, it was necessary to ~nclude insulating materials in space 9 adjacent the electrical controls 89 so as to prevent the electr~cal controls 89 from overheating. However, with the use of the preheater ~n the reg~on adjacent the electrical controls 89~ the electrical controls tended not to overheat, even without the insulation, as 2~ the tap water in the preheater 100 absorbs the heat energy as a~oresaid.
The steam 14 is produced in the boiler 12 at a pressure of approximately 14 lbs, pressure. As water 16 is con~erted ~nto steam 14 1n generator 12, the w~ter level falls unt~l lt reaches LMIN. When the water le~el reaches LMIN, the float contrnl valve 140 emits an electr~cal signal through wires ~ 16 -150 to solenold Yalve 152~ causing ~he valve ~o ~n~roduce tap water into the preheater 100.
The water inlet 107 of preheater 100 1s below the water outlet 105. Since hot water rises, the tap water introduced lnto preheater 100 will force the hot water ~hrough the outlet 105 into the boiler inlet 86. The water 16 lntroduced ~nto the generator 12 has been preheated by preheater 100 and accordingly the temperature of the water 16 1ntroduced 10 into ~he boiler approximates the temperature of the water 16 in the boiler 12. Upon mixlng of ~he introduced water, the overall temperature of the water 16 in the genera~or 12 will stay relatively constant.
For example, in one partlcular application a generator t2 was utili~ed to generate steam at 14 lbs. pressure. Without the utillzat~on of the preheater 100, tap water introduced dlrectly ~nto the generator 12 resulted in a pressure drop to 4 lbs. pressure, as the water m~xture dropped the temperature 20 below the boil~ng temperature of water.
Upon util~z~ng the preheater 100 descr~bed herein, ~t was found that when the tap water was prehea~ed ~n the preheater lOO ~nd then lntroduced ~nto the bo~ler 12, there was relatively 1~ttle change ~n the steam pressure as the pressure ~n the bo~ler fell momentar~ly to 12 lbs. pressure and qu1ckly returned to~l4 lbs. pressure.
Such a result lncreases ~he cooking efficiency of the industrial oven 2 as ~he cooking pressure is main~ained rela-tively constant with l~ttle fluctuation.
Moreover, ~he relatively constant pressure of steam wh~ch resul~s from the use of the preheater 40 increases the l~fe of the boiler 12 as the flexing stresses in the bo~ler are m~nimlzed, thereby minimizir,g ~he s~resses which must be borne by the stayrods and welds.
Once the water level ~n the boiler 12 reaches LMAX ~he float control ~alve 140 shuts off the flow of tap water into preheater 100 as descrlbed. The float valve control 140 may also shut off ~he flow of gas to gas burner tubes 18 by generating a signal ~o the valve 154 through wires 156 in the eYent that the water level falls before the safety LSAFETy.
A steam separator 158 ~s util~zed ln the vacinity of the steam outlet 87 as best ~llustrated in Figure ~. The steam 20 separator 158 is a piece of metal whlch has been b~nt to presen~
a generally ~Lu shaped cross section, one leg of which has been welded to the lnter~or wall of panel 58 ~n ~he reg~on adjacent to steam outlet 87 as lllustrated. The steam separator 158 ~sslsts ~n preYenting the spray of boil~ng water 16 from being carr~ed off by the steam 14 ~nto the cooking ~rea, as nny spray of bo~llng water 16 ~hat h~ts the steam separator w~ll remain ln the t~nk 12. Therefore, the steam 14 ut~lized 1n the cooking ~rea (nat shown) ls relatively free of water 16. Furthermore, ~ 7 it has been found that less tap water is used with the steamseparator 158. This increases the efficiency of the boiler 12 ~s the boiler 12 will not need to be "f~lled up" as many times, again minimizing ~he flexing action as described above, and thereby prolonging the useful life of the boiler and the welds.
Although the preferred embodiment as well as the operation and use has been specifically described in relation to the drawings~ it should be understood ~hat variations in the 10 preferred embodiment ~ould easily be achieved by a man skilled in the ~rt without departing from the spirit of the invention.
Accordingly, the invention should not be understood to be l~mited to the exact form revealed by the drawings.
Claims (15)
1. An industrial oven, including the combination of:
(a) a steam generating tank having a fluid inlet and a steam outlet;
(b) walls depending from said tank for defining a combustion chamber therebelow;
(c) a preheater associated with one of said walls exteriorially of said combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communi-cating with the tank inlet;
(d) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank;
(e) means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
(a) a steam generating tank having a fluid inlet and a steam outlet;
(b) walls depending from said tank for defining a combustion chamber therebelow;
(c) a preheater associated with one of said walls exteriorially of said combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communi-cating with the tank inlet;
(d) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank;
(e) means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
2. An industrial oven as claimed in claim 1 wherein said preheater is part of one of said walls defining said combustion chamber.
3. An industrial oven as claimed in claim 2 wherein said tank presents a stepped portion within said combustion chamber.
4. An industrial oven as claimed in claim 3 wherein said preheater is located in the region adjacent said tank and opposite said stepped portion so as to concentrate heat energy therebetween.
5. An industrial oven as claimed in claim 4 wherein said preheater includes a wall adapted to contact and overlap one of said stepped portions of said tank in said combustion chamber.
6. An industrial oven as claimed in claim 5 wherein said tank includes a steam separator in the region adjacent said steam outlet for separating water from said steam in said tank.
7. An industrial oven as claimed in claim 6 wherein said tank and preheater includes stayrods welded to opposite walls of said tank and preheater respectively.
8. An industrial oven, including the combination of:
(a) a steam generating tank having a fluid inlet and steam outlet;
(b) walls depending from said tank and defining a combustion chamber therebelow, (c) said tank presenting a stepped portion within said combustion chamber;
(d) a preheater associated with one of said walls exteriorally of said combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communicating with the tank inlet;
(e) said preheater located in the region adjacent said tank and opposite said stepped portion so as to concentrate heat energy between said preheater and said stepped portion of said tank;
(f) said preheater including a wall adapted to contact and overlap one of said stepped portions in said combustion chamber;
(g) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank;
(h) means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank;
(i) said tank including a steam generator in the region adjacent said steam outlet for separating water from said steam in said tank.
(a) a steam generating tank having a fluid inlet and steam outlet;
(b) walls depending from said tank and defining a combustion chamber therebelow, (c) said tank presenting a stepped portion within said combustion chamber;
(d) a preheater associated with one of said walls exteriorally of said combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communicating with the tank inlet;
(e) said preheater located in the region adjacent said tank and opposite said stepped portion so as to concentrate heat energy between said preheater and said stepped portion of said tank;
(f) said preheater including a wall adapted to contact and overlap one of said stepped portions in said combustion chamber;
(g) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank;
(h) means for controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank;
(i) said tank including a steam generator in the region adjacent said steam outlet for separating water from said steam in said tank.
9. An industrial oven as claimed in claim 8 wherein said tank and preheater include stay rods welded to opposite walls of said tank and said preheater respectively.
10. An industrial oven, including the combination of:
(a) a steam generating tank having a fluid inlet and a steam outlet;
(b) walls depending from said tank for defining a combustion chamber therebelow;
(c) a preheater associated with one of said walls exteriorially of same combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communicating with said tank inlet;
(d) said tank and said preheater including stayrods welded to opposite walls of said tank and said preheater respectively;
(e) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank, (f) means of controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
(a) a steam generating tank having a fluid inlet and a steam outlet;
(b) walls depending from said tank for defining a combustion chamber therebelow;
(c) a preheater associated with one of said walls exteriorially of same combustion chamber and having a water inlet therein, and a water outlet thereof, said preheater water outlet communicating with said tank inlet;
(d) said tank and said preheater including stayrods welded to opposite walls of said tank and said preheater respectively;
(e) means for generating heat energy within said combustion chamber so as to preheat water within said preheater and generate steam from water within said tank, (f) means of controlling the introduction of water into said preheater and into said tank so as to minimize the drop of steam pressure in said tank during introduction of water into said tank.
11. An industrial oven as claimed in Claim 10 wherein said preheater is part of one of said walls defining said combustion chamber.
12. An industrial oven as claimed in Claim 10 wherein said tank presents a stepped portion within said combustion chamber.
13. An industrial oven as claimed in Claim 12 wherein said preheater is located in the region adjacent said tank and opposite said stepped portion so as to concentrate heat energy therebetween.
14. An industrial oven as claimed in Claim 13 wherein said preheater includes a wall adapted to contact and overlap one of said stepped portions of said tank in said combustion chamber.
15. An industrial oven as claimed in Claim 14 wherein said tank includes a steam separator in the region adjacent said steam outlet for separating water from said steam in said tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000489199A CA1246407A (en) | 1985-08-21 | 1985-08-21 | Pre-heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000489199A CA1246407A (en) | 1985-08-21 | 1985-08-21 | Pre-heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1246407A true CA1246407A (en) | 1988-12-13 |
Family
ID=4131227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000489199A Expired CA1246407A (en) | 1985-08-21 | 1985-08-21 | Pre-heater |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1246407A (en) |
-
1985
- 1985-08-21 CA CA000489199A patent/CA1246407A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4730600A (en) | Condensing furnace | |
| US6766796B2 (en) | Heat exchanger for forced air circulation ovens, particularly for baking food | |
| US4867673A (en) | Condensing furnace | |
| US4714050A (en) | Pre-heater | |
| DE3445273A1 (en) | Heat exchanger | |
| US6000392A (en) | Steamer gas oven | |
| CA1246407A (en) | Pre-heater | |
| US6810836B1 (en) | Finned tube water heater | |
| US2070182A (en) | Steam generator | |
| US387393A (en) | Half to chaeles e | |
| US2104918A (en) | Water heater | |
| RU2794681C1 (en) | Fire tube water boiler | |
| US2069956A (en) | Boiler | |
| US3207131A (en) | Fuel burner boiler unit | |
| US5687677A (en) | Heat exchange tube and method of making same | |
| SU1012880A1 (en) | Cooking line | |
| US39289A (en) | Improvement in steam-boilers | |
| US89240A (en) | Improvement in steam-generators | |
| IE48624B1 (en) | Improvements in and relating to boilers | |
| CN2450590Y (en) | Atmospheric horizontal steam-water heat transfer boiler | |
| KR880001413B1 (en) | Steam generator | |
| CA1128386A (en) | Boiler | |
| JPH0442677Y2 (en) | ||
| US351652A (en) | Steam-boiler and furnace | |
| US3391676A (en) | Fire tube hot water boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |