USRE13337E - Poration of califobnia - Google Patents

Description

J. R. ATGHISON & 0. R. WBYMOUTH. SYSTEM OF REGULATION FOR OIL BURNING PLANTS.

APPLICATION FILED OCT. 19. mos. Bmssued Dec. 12, 1911. 1 3,337.

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J. R. ATGHISON & O. R. WEYMOUTH. SYSTEM OF REGULATION FOR OIL BURNING PLANTS.

APPLICATION FILED 00T.19, 1008. Relssued Dec. 12, 1911.

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J. R. ATGHISON a: C. R. WEYMOUTH. SYSTEM or REGULATION r03 OIL BURNING PLANTS.

1 3,337. 6 SHEETSBHEET 3 APPL IOATIOH FILED 001219, 1808. Bmssued Dec.l2,1911. I

4 INVILNTORS,

ATTORNEY WITNESSES.-

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APPLICATION FILED 00T.19, 1908.

J. R. ATGHISON & C. R. WEYMOUTH. SYSTEM 01" REGULATION FOB OIL BURNING PLANTS.

Reissued Dec. 12, 1911.

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J. R. ATCHISON & 0. R. WBYMOUTH. SYSTEM OF REGULATION FOR OIL BURNING PLANTS.

APPLICATION FILED OOTJQ, 1908.

RJBiSSllBd Dec. 12, 1911.

INVENTORJ:

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ATTORNEY.

J. R. ATCHISON & G. R. WEYMOUTH. SYSTEM or REGULATION ron OIL BURNING PLANTS.

APPLICATION FILED 00T.19, 1908. Reissued Dec. 12, 1911. 1 3,337.

6 BHEETS8HEET 6.

' UNITED STATES PATENT OFFICE.

TAKES R. ATCHISON, OF SAN FRANCISCO, AND CLARENCE B. WEYMOUTH, OF BERKE- LEY, CALIFORNIA, ASSIGNOBS TO CHAS. C. MOORE 6': CO., ENGINfiEBS, INC., A COB- ]?ORATION OF CALIFORNIA.

SYSTEM OF REGULATION FOR OIL-BURNING PLANTS.

Specification of Iteissued Letters Patent. Rgissued Dec. 12, 1911.

Original 80. 888,466, dated May 5, 1908, Serial No. 285,504. Application for reissue filed October 18, 1908. Serial No. 458,572.

To all whom it may concern:

Be'it known that we, JAMES R. Arcmson and CLARENCE R. WEYMOUTH, citizens of the United States, residing, respectively, at San Francisco, in the county of San Francisco, and at Berkeley, in the county of Alameda, State of California, have invented certain new and useful Improvements in S stems of Regulation for Oil-Burning P ants, of which the following is a specification.

Our invention relates to a novel automatic system of regulation for oil burning plants, and particularly to'a method or process for such regulation. Illustrative apparatus of a practical character, adapted to carry out the said method or process is shown in the accompanying drawings, and is herein described in order that the nature of the rocess shall be thoroughly understood. S hich apparatus contains many novel features in design and construction, which will be made the subject of separate applications.

The essential idea or principle of our invention consists in utilizing the variation of oil pressure in a main connecting with all burners so as to automatically regulate the supply of steam to the burners, steam being there employed for atomizing the oil. That is to say the variation in oil pressure, according to the demand for steam, is utilized to control the steam pressure in a steam main connecting with all the oil burners. Further the variations in pressure in the common oil main are employed to regulate the amount of opening in a damper, so as to give a greater or less supply of air for combustion. The variation in the pressure in the oil main is caused by'the operation of an automatic pump governor by which the supply of steam to the oil supply pumps is re dated, the object being to maintain a unlform boiler pressure.

We are not aware that it has even been proposed to take advantage of the necessary variations in 'oil pressure for controlling the supply of steam for atomizing purposes, or for damper regulation.

The principles of our system as applied to a steamboiler plant burning oil fuel which is atomized by steam is susceptible of other applications without material change, and we mention some of these in' order that the range and scope of the invention. may be thoroughly understood. For example in boiler plants using air as the atomizing agent, the variations in oil pressure can be used for air pressure regulation in substantially the same manner as for steam pressure regulation as we describe it. Again in such plants as forging furnaces, ore roasting furnaces, reverberatory furnaces employing fuel oil and atomizing by steam or air, the variations in oil pressure can be used to control automatically the supply of steam or of air for atomizing, orfor controlling a damper opening or for both. Such modifications in apparatus as will be required under these conditions will be apparent to those skilled in the art after an understanding of the process as applied to steamboiler plants as hereinafter described and as shown in the accompanying drawings in which:

Figure 1 is a front elevation of'a battery of steam boilers in connection with an installation of apparatus for carryin out our process; Fig. 2 is a top plan of t e same; Fig. 3 is an end elevation of the same; Fig. 4 is an elevation partly-in section of the oil pump governor; Fig. 5 is a top plan of the same; Fig. 6 is an elevation of the damper regulator; Fig. 7 is a planview of the same; Fig. 8 is a sectional elevation of the steam pressure governor; Fig. 9 is a plan view of the same.

InFigs. 1, 2 and 3 a plant employing our system is shown with its parts in assembly and connection.

The steam boilers A, are supplied with oil burners C of any approved type and construction. Oil fuel is furnished to these burners through the oil main G which is common to all of them and delivers the oil to them through branch pipes as shown. Steam for atomizing purposes is applied to all the burners through pipes 4 from the steam main E. \Ve have not considered it pipe F the pipe F having a suitable rotary valve Y for governing the supply of the pipe F and the pipe F leading to the pumps. This valve is automatically regulated by the oil pumps governor shown in Figs. Land 5. This governor comprises a chamber 7 having a flexible diaphragm (not shown but in common use) which receives steam at boiler pressureon its under side through a pipe 8 communicating with any point'where it is desired to control the pressure, as for instance the main steam headeror the auxil iary steam main'l). The diaphragm carries on its upper side a pin 9., which extends above the chamber and bears upon the point The force ex-' 11 of the weighted lever 12. I erted by steam pressure against the dia% phragm isopposed by theweights 13, 14'- which are adjusted to the desired initialor normal'balance; ,VVhen the steam pressure increases the lever l2 is lifted and also the auxiliary lever 15 which has a connecting rod to the piston 16 of the water cylinder 17-, The pis ton is thus raised and, by its connection and is pivoted in the fulcrum 21.

through the lever 18 and rod 19 communicates motion to the -main steam valve V so as to"decrcasc the steam supply to the pumps. A diminution of boiler, pressure will cause the valve to'be moved in the opposlte direction and will thereby increase the steam supply to the pumps The pumps supplyoil to the oil main G undervarying'pressures according to the demand fol-steam and wenow explain how these varying pressures alone regulate the supply of steam-for atomiZi'n-g purposes. The steam pressure regulator is illustrated inFigs. 8 and 9 and a general Vie-W ofv its connections in Fig. 3. Its purpose is to cause the variation inoilpressure to control a valve in a pipe" connecting the steam main- .D contain ing steam at boiler pressure 'with'the steam main E which directly supplies the burners. and in which the steam pressure is Variable.- This pipeis shown. at 23 and=-is provided with any-:form of rotary valve W operatedby a rod'Q lfwhose connection to the 'valv'eis' best shown in Figs. 2 and 'Referring' first to 'Figs. 8 smell), the" steam regulator" comprises a casmgxor-cylmder 22, 01 more properly ;two. cylinders containing "two proper ratio to. be maintained between the oil pressure and the pressure of the atomizing agent to secure the best results underthe varying oil pressures that must obtain, and especially with wide ranges of loads 'or dee mands up'onsteain. By changing the areas 'of these pistons as by making the oil piston of greater, the same or less area than the;

stea'm piston to suit the dilferent conditions under which they are required to' befoperjatfcdand'by conibining or using them with a constant but adjustable weight upon the lever the pistons can be made to produceany desired method of governing the supply of steam and oil tothe burners. 'T he space be? tween the finnerendo'f the larger pi'st'on as the on piston',! and the end ofthe cylinder is preferably provided with a 'dr'ip" pipe'asshown iirdotted line'sat 22 to prevent the accumulation of moisture due "to leakage which mighti1 1terfe1'e "\\*itl1 the full Land free movement of the piston. 7'1

A. weighted lever 27"restsupon the stem of the piston 'and'ha's Renee end connected with then-ea end of a lever 28. The other end of the lever 28 is connected with the valve stem 29: ofa piston in the water cylinder' 30-i'milar'to the construction 'shown' in Fig. 4. but'the' lever isshown as bei'ng piv otally-supportedby a movable fulcrum asan' arm 31-onthe upper end of the piston rod 'whiclr'rende'rs itl'ess sensitivcthan .1; fixed fulcrum. although it could be fixed if desired? The rod 33 fo'rming thelower end of the piston is con'n'eeted'with alevr which-in turn is connectedwvith vane' 'wj through the rod'24 whereby themovem e'nt of the oil and steampis'to'njwill' eontrol 'thef" passage-of steam through the valve In operation the weight'36on the lever 27 is adjusted'to holcl the-oil and steampres'f sures in" equilibrium' at any desired point. Infcase the load should be increasedand a greater demand made for steam there would immediately be a'n'in'crease *in "the oil p're'sr sure which would cause an upwardfmo've incnt of'the piston and of the leversf27 and 28 and-also of the-lever 34 and rod QQW-hichw would increase"thefopening in'fthe' rotative valve and thereby admit'more *S't'eain through the pipe to the fpisto'n- 26' until" the pressm'e-would be equalized and equilibrimnrestored. 1 At thesame time that thestean pressure increased upon the pie} ton it would be correspondingly increased at the burners and the equilibrium of the piston would hold the pressure at that point or degree so long as there was a demand for such a quantity of oil at the burners. A decrease in the oil pressure will cause anopite movement of the regulator.

As above described it is evident that the amount of oil necesary for the combustion to kee the desired steam pressure will be contao edautomatically and that the amount of atomizing agent whether of steam or of air will be also automatically controlled to correspond with the amount of oil. But it is desirable for the highest economy that the amount of air to sup rt the combustion be also lated. This can be done by means of ampers located at any desired point, as in the smoke stack, at the rear of the boilers or at the ash pit, depending on the type of boiler and other controlling conditions. In the construction shown in the drawings the air supply will be controlled entirely by the dampers at the rear of-the boilers, the ash pit doors being opened to admit air freel This regulator may or may not contro the air supply exactly to give an amonnt of air proportional to the fuel being consumed that being determined gas analysis only, and not by observa tlon. In setting the dampers the draft from the stack, capacity of plant, etc., must be taken into consideration and a suflici'ent amount of air must be provided for the maximum overload as well as the fractional load. An arrangement of toggles such as to increase or decrease the relative motion of the damper regulator ateach point will be determined by trial in each case so as to give as near as possible the proper air suppl for all loads.

n Fig. 3 the regulator is shown in positiorrrelatively to the boilers and in Figs. 6 and 7 it is shown in detail. A chamber 37 is connected with the oil ressure main G by pipe 38 and provided with the usual diaphragm or piston the same as the oil pump vernor. -A lever 39 is actuated by this iaphragm through the stem 40 which actuates the auxiliary lever 11 and the lever 41 controls the piston in the water chamber 42 and thereby the lever 43. In addition to the weight 44 on the lever 39 a spring 45 'is also preferably utilized for secur the desired prmsure or tension upon the iaphragm to oppose thesteam pressure. The dampers 46 at the rear of the boilers are connected with a rock shaft 47 and the shaft is connected with the lever 43 by a rod' 48. Orthe water chamber may be omitted where it is not desired to have the governor so sensitive and the rod 48 can be connected direct with the lever 39. The governor will be so arranged that the dampers will be opened to cause a greater supply of air when theoil supply is increased and closed with the decrease of oil.

While it does not make any difference whether the steam pipe 8 is connected directly with the boilers or the main steam headers connecting with the engines or the auxiliary headers, in a large plant it may be necessary to make the auxiliary steam main and the oil main leading to the burners of such size that there will not be serious drop of pressure between the point at which the governing is done and the extreme portion of the system; or a loop 5 'stem can be provided to overcome the di culty.

'In a plant having a widely varying load a portion of the boilers can be cut in or out as the load varies by closing or opening'the branch steam and oil connections to the individual burners, or the same total of boilers can be used and the load upon all of them can be increased or decreased equally. \Vhere the boilers are cutin or out the dampers of the idle or cut outboilers can be fastened in a closed position if desired.

While we have herein illustrated and described means for varying the pressure of the steam and the pressure of the oil at the respective burnersautomatically, yet very advantageous results may also be obtained by so re lating said pressures by hand. These a vantages are great economy in labor, in the supply of steam to burners, and in the proper and s )eedy proportioning of the fuel supply toall of the burners as required. and, as a result of this-condition, an increased efliciency of combustion. In addition, when two or more furnaces are simultaneously operated on the same variable load. the simultaneous regulation of the firing in all furnaces at one time results in a still further furnaceelliciency.

We claim':-

1. In a system of regulation for liquid fuel burning plants, a liquid fuel burner adapted to receive a continuous flow of liquid fuel and a continuous flow of an atomizing agent, means for varying the supply pressure of said liquid fuel and thus the rate of flow of said fuel through the burner, and means controlled by the variation of said liquid fuel pressure for automatically governing the supply pressure of said atomizing agent and thus the rate of flow of said atomizing agent through the burner and producing a continuous flow of said atomizing agent, the said governing being independent of a commingling action of said fuel and said atomizing agent, substantially as described.

2. In a system of regulation for liquidfuel burning plants, steam-controlled means for feeding fuel thereto under a variable pressure, a dam r, a rod for operating the same, and means controlled by the fuel pressure for varying the amount of opening of the damper and including a spring opposing the fuel pressure; said spring limiting the movement of the damper-rod so that such movement shall be proportional to said fuel pressure and to the deflection of said spring, substantially as described.

3. In a system of regulation for liquid.

pressure of the atomizing agent and the quantity of air for combustion to correspond with the amount of fuel being-consumed substantially as described.

4. In a system of regulation for oil-burning plants, means for feeding oil thereto under variable pressure, means for supplying an atomizing agent t-othe burner under variable pressure, and external means controlled by the oil pressure for holding the pressures of the atomizing agent and of the oil in equilibrium at a certain relation, substantially as described.

5. In a system of regulation for oil burning plants, means for feeding oil thereto under a. variable pressure, means for supplying an atomizing agent to the burner un der a variable pressure, and means for establishing an equilibrium at a. certain ratio between the pressure of the oil and that of the atomizing agent, whereby when said equilibrium is affected by variation in the oil pressure it is restored by automatic variation in the pressure of the atomizing agent, substantially as described.

6. In a system of regulation for oil burning plants, means for feeding oilthereto under variable pressure, means for supplying an atomizing agent to the burner under variable pressure, and means, including a member exerting a constant but adjustable pressure, for establishing an equilibrium at a certain ratio between the pressure of the oil and that of the atomizing agent, where by when said equilibrium is affected it is restored by automatic variation in the ressure of the atomizing agent, substantial described. v

7. In a system of regulation for oil burning plants, means for feeding oil thereto under a variable pressure, means for supplying an'atomizing agent to the burner undera variable pressure, a movable member subjected to such pressures in opposite directions, and a member for applying a constant but adjustable pressure to said movable member for establishing an equilibrium at a. certain ratio between the pressure of the oil and that of the atomizing agent, Whereby when said equilibrium is affected it is restored by automatic variation in the, pressure of the atomizing agent, substantially as described.

8; In a system of regulation for oil burning plants, means for feeding oil thereto under a variable pressure, means for supplying an atomizing agent to the burner under a variable pressure, a reciprocatory member having surfaces of different areas subjected to said pressures in opposite directions, and a member for applying a constant but adj ustable pressure to said reciprocatory mem,

her for establishing an equilibrium'at a certain ratio between the pressure of the oil and that of the atomizing agent, whereby when the said equilibrium is affected it is restored by automatic variation in the pres sure of the atomizing agent, substantially as described.

sure of the oil being exerted upon the larger 5 area and that of the atomizing agent upon the smaller area, an adjustable Weight, and means for applying the pressure of said Weight to the smaller area in addition to' the pressure of the atomizingagent, where by when said equilibrium is affected it is restored by automatic variation in the pressure of the atomizing agent, substantially as described.

10: In a system of regulation for oil burning-steam generating plants, means for feed- 1 ing oil thereto under a variable pressure, a conduit leading to the burner for supplying steam in a certain ratio to the oil for atomizing purposes, a throttle in the conduit for varying the steam pressure to the burner, means connected with the throttle and controlled by the oil and steam pressures for varying the steam pressure to maintain the proper ratio at different oil pressures, substantially as described.

11. In a system of regulation for oil burning steam generating plants, means for feeding oil thereto under a variable pressure, a steam pipe for supplying steam to the burner in a certain ratio to the oil for atomizing purposes, a throttle in the pipe for varying the steam pressure therein to the burner, a movable member adapted to be controlled by the oil and steam pressures, and a. system of levers controlled by said memberand connected with said throttle for maintainin the proper ratio between the steam and oi at different oil pressures, substantially as described.

12. In a. system of regulation for oil burning steam generating plants, means conhas inverseIy as the steam pressure,

pressure to the burners may pendentl or com izin purposes, means for controlling the admission of air for combustion, sa1d last two mentloned means belng automatlcally and synchronously operated by the oil pressure, substantially as described.

13. In a system of regulation for oil burning steam generating plants provided with a pluralit of burners, an oil main common to all of t 1e burners, an oil pump connected with the main, means for operating the pump directly with the generated steam, means controlled by the steam pressure from the lant for automatically varying the admission of steam to the pump whereby the pressure in the oil main is varied, means for supplying steam to the burners under a variable pressure for atomizing purposes, means for controlling the admission of air for combustion, said last two means being connected with the oil main and adapted to be automatically and synchronousl controlled by the oil pressure, substantially as described.

14. In a system of regulation for oil burnin steam generating plants having a plura ity of burners, an oil main common to all of the burners, an oil pump connected to the oil main, an auxiliary steam pipe concommon to all the burners and receiving its supply from said auxiliary steam pipe, means controlled by the steam pressure in the auxiliary steam pipe for automatically varyin the admission of steam to the pump and means for controlling the .admission of steam to the main steam pipe whereb the steam be varied to correspond with the oil pressure, the means for controlling the admission of steam to the main steam pipe being connected with the oil main and adapted to be automatically and synchronously controlled by the oil pressure, substantially as described.

15;In a system of regulation for fluid fuel burning lants, a uid fuel burner, meansfor fee ing fluid fuel-thereto under a variable ressure, means actuated indeof the fuel feed for supplying air ustion, and means controlled by said variable fuel pressure for varying the rate ,of said supply of air, substantially as described.

16. In a system of regulation for fluid fuel burning lants, a uid fuel burner, means for fee ing fluid fuel thereto under a variable pressure, means controlled by the fuel burning plants, means for feeding liquid fuel thereto, means for varying the pressure of the fuel so fed, means for vary ing the supply of atomizing agent, means for supplying air for combustion, and means controlled by the pressure of the fuel for varying the rate of air supply, substantially as described.

18. In a system of regulation for licuid fuel burning plants, means for fee ing liquid fuel thereto, means controlled by the steam pressure for varying the pressure of the fuel so fed, means for varying the supply of atomizing agent, means for supplymg air for combustion, and means controlled by the pressure of the fuel for varying the rate of air supply, substantially as described.

19. In a system of regulation for li uid fuel burning plants, means for fee ing liquid fuel thereto under variable pressure, means for applying an atomizing a ent under variable pressure, means contro led by the liquid fuel pressure for automatically varying the atomizing pressure, and means controlled by thesteam pressure for automatically varying the liquid fuel pressure, substantially as described.

20=-1n a system of regulation for li uid fueL burning plants, means for fee ing liquid fuel to a plurality of burners, means for simultaneously varying the liquid fuel pressure at all of said burners, individual pipes for supplying an atomizing agent to said burners, and means independent of the aforesaid varying means for simultaneously varying the pressure of said agent in all of said pipes, substantially as described.

21. In a system of regulation for li uid fuel burning plants, means for fee ing liquid fuel to a plurality of burners, means controlled by the steam pressure for varying the liquid fuel pressure at each of said burners, individual pipes for supplying an atomizin agent to said burners, and means indepen ent of the aforesaid varying means for simultaneously varying the pressure of said described.

JAMES R. ATCHISON. CLARENCE R. WEYMOUTH.

Witnesses:

F. M. WRIGHT, NELLIE B. KEATING.

copies ot this patent may be obtained for five cents each, by addressing the Commissioner of Patents, walhington, D. 0.

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