US2685866A - Multiple tube boiler arrangement - Google Patents

Description

Aug. 10, 1954 o. A. YOST 2,685,866

MULTIPLE TUBE BOILER ARRANGEMENT Filed May 2, 1952 IN V EN TOR.

flTTOR/VEY Patented Aug. 10, 1954 2,685,866 ,MUL'HBLE TUBE 1201mm ARRANGEMENT Qscet A 19%, New Yerk, Y Application-May 2, 1952, Serial No. 285,600 22.1

1 Claim. 1

This invention relates :toa "double water tube boiler and more particulariy'to an arrangement for utilizing the waste heat intheteases leaving the boiler and passing toward the Smokestack.

It is an bject of the nresent invention to pro ide a double boiler arrangement whereby westehea in thegases iea'vins the bofl r urne t may be utilized torkeepingthe not boiierof one 6f the boi ers ofthe arraneementriromth as s assing outwardly of the other, boi er of. he arran emen wh reby the one: boiler if rne ecen the sep h a e timesext pt whe shut down I provide a double boi er arrangement here n easesirom one bo ler arrangement having a t mperature of QQ eSFS IEnheit mar n eas ly nd onveniently delivered oedeedboil r in ch boiler tubes have beenelnptied of water and to br n t esehoiiertubesto a :tem eneture of about 6 0 BgtBesEahrenheit th tehscele adher n he atersi e o the tubes will be d ed o afine powde a decan-beeesi yvwes ed out in the usual manner applicableto washin out I th W te side-of the :boiler and he by t reduce the cost of main-tenancein thi manner in the running or-steam toilersa d to el min te the need for cleanin thetubesw t chem als; hand cleaning vti e to thereby eminent damage ltjo askets resultin from chemical cl aning an provide means tor clea in the nsid to; w er tubes which have a curvature.

ltis another object of theinven ion to e uc the leaning co t of water tube boilers s th the operat r-can d th lea n himse i a mutine operation and to elim nate'the meth ds. now in use which are usually done by shipyardsatihigh cost and wherein the bo ers wi be kep in substantially the em -eond tmn .es-orieina ly whennew and w eremthe e wil beee e -seyin of the total fuel consumption inhthe amount of ir n; one to t n p t of thelpnesentm t- Other obiects of e invention ere to prpyisle a d uble hoile nrraneementwhe ei the Was e heat of gases icavingtoneiboilerniay be-r tiiized m'etne o her boiler-rortreused same hol er by e simple .m nin la qn 9f, yaive element ea blower motor and thermostat control, which is of simple construction, easy to install, inexpensive to manufacture, reduces costs of insurance and underwriters costs, permits idle boilers to be brought up to full planned power output in a short time, reduces the chances of aooisitnts, keeps boilers ready operation, compact, and efiicient in operation.

For'other objects end-for a bet er understandng of the invention reference may he had to the follow n d t iled descriptio tak n n s0n= nect on wi h the e. Nmpa in rawi g w ich Fi ure 1 is .a ertica set ienel vie-W 9i the oubl bo er arran ement and the veat pipe and v lve rrang men embod ng th tu es o the pre en inventien Fig.- 2 is a dia rammatic riew s; a 0i three-b er ar ang men emb dyi the fetish or the inv nt on; Y

Re e ri n wra t tultirl to F g- H and I? respe t vely epre ent two boi er tu n ne as ent: bled and rra ed to u ize? s n l smbktstetk- The fur a e an i l; burne or de ver n a flame underneath wate tu e ltha ne he de I5 nd H at t e Q PQs cends 9 the same and whiehis e nnected wh nes i i-end i -with an expans o steamend .wat t k, 9- This water tank has a u erhea e 2! tctnnetted t i t he emo e; fsttam b w Qt s ea turbines ther qui ment ut liz nei he ste m- A similar r ngements p uvid d th o her furnace Il ne si arnum rel a vu ili td to V eesiena e he sim ar parts th reo The medutt -ofnombustim me e u wardl to the t9; o therurnace and at Qne m nt the empe ew- 91- theseease n twe ter- Fah e hei and e th l ve immedia el -abo e t e superheat r.

At another .l rel th eehwe, he emnertt ren these a e and p oduc s o ombu ti n e ii 0o dee e s le enhe t- The cesine of t 7 new na rows to-provisle int ined debts?! and 2.5 whicht tadt h chimn st t}; L A blower 26 e tathedt a ling 2. w th n e e ic m m-r18 w i h 'driic t tl we to effect thewi hdrewel ca the int $911 h steamin bo er- Th blow r 2t and the s e -r t io m tor 23 a e moun ed uponasu ebl e 19 The lower ise teched b title me nine. 3| which is connected to a cross fitting 32. Leg} control ...1- oi the bit Level. iiZe tlits1.3.3 emai tend 2 w.

eases into t er pe the pi e 33 is V513? fitting .35 in. he. pi e & s re yefitt ne 13,

These valve fittings can'be operated to control w risers the flow of the gases at the hot gases level to the vertical riser pipe 3| and to the blower 26.

Elevated above the cross fitting 32 and extending therefrom is a vertical extension pipe 31 which has a T-fltting 33 on an upper end and which is connected by pipes 39 and 40 with the boiler furnace casing to remove gases at a reduced temperature of 300 degrees Farenheit therefrom. These pipes respectively have baliles 39 and 40 to direct the gases toward the pipes. The pipe 38 has a valve control element 42 and the pipe 4! has a valve control element 43.

It can be seen that by the operation of the valves 35, 36, 42 or 43 that the gases can be taken off at different elevations and at different temperatures and from the different boiler furnaces.

The hot gases are delivered through the outlet pipe 44 leading from the blower 25 and which is connected to a T-fitting 45 from which pipes 46 and 4'! extend. These pipes 46 and 4'! respectively lead to fire boxes 48 and 49 of the furnaces H and 2. The pipe 46 has a valve control element and the pipe 41 has a valve control element 52. It is thus seen that the supply of the hot gases to either of the boilers II and 12 can be effected by the operation of the control valve elements 5! and 52.

As shown in the drawing, the right boiler is in operation while the left boiler is dead. The left boiler may be emptied of water and com pletely shut down. A thermometer 53 capable of measuring the temperature from l to 1,000 degrees Fahrenheit is provided on the discharge pipe which leads from the blower 23 and indicated at 44. All the piping, the valves and the blower are well insulated so as to retain the heat from the gases taken from the boiler in use.

The size of the pipes can vary according to the horsepower of the boilers. A motor from one-half to one and one-half horsepower of the variable speed type should be used. The blower capacity should conform and balance with the electric motor. The piping valves do not have to be of heavy material, as the gases on large boilers do not exceed ten pounds pressure. This arrangement will be used on water tube type boilers, using fuel oil for firing purposes, and the fired gases should be clear of soot.

To put this system into use so as to heat the end boiler, the blower and the motor are started and all of the valve elements except valve elements 43 and 5| are closed. Valve element 43 and valve element 5| are open. Gases at the 350 degree temperature level will accordingly be taken from the boiler I2 and transferred to the fire box 48 of the boiler H to bring up the temperature of the boiler I i and to keep the same at an even temperature of 300 degrees. It will thus be seen that there is no need to have a cold boiler when out of use, unless repairs have to be done on brick work or furnace registers. By using this arrangement many of the repairs are eliminated. By this means at all times on idle boilers oxidation of the fire side of the tubes, stays, braces and furnace shell will be eliminated as the boilers will be filled with gases having a carbon dioxide content of'from 5 to percent and quite free then of oxygen. Accordingly, oxidation is reduced.

This arrangement can be used to clean the water tubing side on the dead boiler. By having the tubing emptied of water and by opening valve 35 and closing valve 43 the temperature from the 600 degree F. level gases will be delivered to the tubing in the boiler l to make the temperature the same to 600 degrees F. so that all scale adhering to the water side of the tubes will dry to a fine powder that can be easily washed out in the usual manner used in the washing out of the water side of a boiler. This operation costs very little compared to the cost of cleaning water side of boilers with chemicals or hand cleaning the turbines. The chemical cleaning can sometimes do a great deal of damage to gaskets and cause leaking tubes. Hand cleaning can only be done on straight tubes and is not satisfactory on superheated tubes due to the curvature of the same. Using this operation on cleaning, labor and material costs are cut or eliminated and the operator can do the cleaning himself as a routine operation and the usual methods now in the marine field are done by shipyards at high cost are thus eliminated. This arrangement will keep the boilers in the same condition as originally when new and will save more than ten percent of the total fuel consumption.

This arrangement can be used to start steam operation on the end boiler. This is effected by filling the tubes to the normal water level and by the use of valves 43 and 5| which will be opened. The temperature will be increased in the boiler l I and thereafter the valve 35 is par tially open to increase the heat; after a few minutes valve 43 is closed so that only the hot 600 degrees F. gases are used. Eventually the idle boiler will be steaming in all parts to an even temperature of 600 degrees F. or at any other temperature as can be regulated by the use of the valves 36 and 43. This is a much better practice of starting up a new boiler than lighting of the fire every few hours or so at a high cost of fuel. By the present arrangement this fuel cost is reduced fiftypercent and the original shock to the tubing and brick work of the dead boiler will be nil. Fuel fire runs about 3,000 degrees F. on starting and it is quite a shock to brick work and to the tubing as a result'of uneven expansion thereof. Where a slow even heat is provided by the present arrangement, no shock to parts of the boiler is involved. Accordingly, this present arrangement should prolong the life of boilers as much as25 percent. This arrangement is particularly useful when rebricking in order to dry out mortars slowly. Insurance and underwriters costs are reduced since all idle boilers are ready for plant power output in shorter time than is now the practice.

It is the usual practice to clean the fire side of tubes with very hot water and as a result thereof the' tubing upon being dried shows indications of rust. If the present arrangement is used, hot gases can be transferred from the live boiler to dry off the water on the tubes and thereby prevent therusting of the sam as a result of this cleaning operation.

It will be understood that while the boiler H is not indicated as the dead boiler that by the use of valves 35, 42 and 52 that similar operations can be carried out by the use of boiler H upon boiler l2.

It will be seen that the blower 25- can be driven by any power which may be available if there is not any electric motor available, such as air, steam or independent drive.

Referring now to Fig. 2, it will be seen that any multiple arrangement of boilers can be used, as shown in this view where three boilers are arranged. with parallel connections. The boilers are indicated generally at 55, 5 6 and 57! and they are constructed similar to the boilers shown above. Each boiler has a separate stack indicated respectively at 55', 56' and 51. Each stack has pipes 58 and 59 with valves 60 and GI respectively. These pipes are at respective upper and lower levels in the furnace. Pipes 58 and 59 lead through to a common pipe 62 which delivers the gases to a blower 63. Leading to each boiler 51, at the firebox level thereof, is a pipe 64 having a valve 65 which leads to a common pipe 66 connected with a discharge side 6-! of the blower 63. The electric motor 68 drives the blower 63.

It will be apparent that by a manipulation of the different valves hot gases at the different temperatures and level can be taken from one or two of the boilers and delivered to the fire box of the dead boiler in order to keep it warm or to start its operation.

It will now be apparent that there has been provided an arrangement which makes for an efficient boiler plant with which great savings of material and labor will be obtained. It will be seen that this arrangement makes it unnecessary for the ship to be put out of use for any great length of time and the boiler plant will be kept in good running order whil still in use.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claim.

What is claimed is:

A double boiler furnace arrangement comprising two boiler furnaces having respectively water tube boilers therein, a super heater above each boiler and operatively connected with the respective boiler, a chimney stack, a duct extending from each furnace to the chimney stack, a vertical riser pipe extending upwardly between the furnaces, two pairs of laterally extending pipes operatively connected to communicate between the furnaces, one pair lying immediately above the superheaters to receive high temperature gases and the other pair being vertically spaced from the one pair and located at a higher elevation to receive reduced temperature gases which are more removed from the superheaters, each of said pipes having a control valv therein, a vertical extension pipe connected between the two pairs of pipe, whereby the pipes will be interconnected with each other so that the temperature of the gases entering the riser pipe may be varied by mixing the gases from the different elevations, a blower connected to the lower end of the vertica1 riser pipe to receive and discharge the gases therefrom, pipe means extendin between the two furnaces at the firebox locations and connected to the discharge side of the blower to receive the heating gases therefrom, selective valve element in the pip means extending between the fireboxes of the furnaces for selectively controlling the fiow of the heating gases to either of the furnaces to be heated.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 711,255 McAllister Oct. 14, 1902 1,326,033 De Erb, Jr. Dec. 23, 1919 1,901,922 Mekler Mar. 21, 19 3

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