Патент USA US2123884код для вставки
July 19» 1938- Ü c. B. FAvl-:RTY VAPORIZER STARTING SYSTEM Filed Dec. 15, 1932 um , ' mw 2,123,884 ` 2,123,884 Patented July 19, 1938 Y UNITED STATES PATENT oFFlcE 2,123,884 VAPORIZER STARTING SYSTEM Clyde B. Faverty, Chicago, Ill., assigner to Mark C. Bates, Chicago, lll. Application December 15, 1932, Serial No. 647,391 5 Claims. (Cl. 48-144) My invention relates in general to vaporizing apparatus and more in particular to a start-ing system for a vaporizing apparatus. In the copending application of Charles A. 5 French, Serial No. 603,491, filed April 6, 1932, a vaporizing apparatus is disclosed in which hot gases of combination from a pilot light are _de livered to a vaporizing chamber below the level of liquid hydrocarbon maintained therein, where' 10 by to vaporlze a portion of the liquid hydrocarbon by sensible heat. The vaporized hydrocarbon is. delivered to an aspirator including a forcing nozzle through which air under relatively high _ velocity and pressure is delivered. The vapor is 15 entrained and mixed with the air and the re - sulting mixture is delivered to burners for com bustion. on certain types of processes. In some forms of installations, starting of the vaporizing appara tus becomes considerable of a problem. This is 25 sometimes due to the fact that the furnace at mosphere in certain processes must be main tained with exactness and any deviation from the desirable character of the furnace atmosphere even for a relatively short time is apt to cause For these and other reasons readily understandable to those skilled in the art, it ls desirable to have quickly operable and 35 > In accordance with the general yfeatures of the invention, I may start the vaporizing appara tus by thoroughly heating the vapor chamber 5 before the admission of fuel thereto, whereby, when operation is initiated through the operation of a blower andthe admission of fuel to the vapor chamber, the pilot burner will have sumcient fuel available for immediate ignition. In accordance 10 with another feature, I may employ a commer cial source of gas in starting whereby immediately to have a combustible mixture available for initiating burning at the pilot light. I also pro vide means for controlling the delivery of the out- 15 v going mixture to prevent incorporation into the furnace of a type `of mixture not` suited to its A vaporizing apparatus of this character has been employed with very excellent and satisfac 20 tory results in a large number of commercial in dustries, principally to supply heat in carrying 30 deleterious results. illustrates the vaporizing apparatus and the means for starting the same. operation or the process in which it is used. Now, referring to the drawing, I show a vapor chamber I0 adapted to contain a liquid hydro- 20 carbon fuel at the approximate -level of the dotted line A. 'I‘he fuel is supplied by a tank II passing through a sediment bulb I2 and through a pipe I3 to a float chamber I4 and from the ñoat chamber through a pipe I6 to the vapor 25 chamber. It is the float (not shown) which maintains the level of thev liquid hydrocarbon constant in the vapor chamber. A balance line I‘I connected to the vapor chamber and to the 'top of the float chamber maintains a uniform 30 gas pressure and proper operation of the ñoat. The vapor chamber is connected by a passage properly controllable starting means for such a way I8 with a Venturi tube I9 which forms part vaporizing apparatus. of an aspirating apparatus including a forcing nozzle 2|. The forcing nozzle receives air 35 through a pipe 22 from a blower 23, a valve 24 being provided in the line, if necessary. The amount of vapor delivered to the Venturi tube being controlled by a valve 26, a portion of the vapor passes to the Venturi tube, is entrained by 40 the air at the forcing nozzle and combines there with producing a combustible mixture. The combustible mixture is delivered to a pipe 21 to which the Venturi tube connects. A pipe 28 ‘ 'I'he principal obj ect of the invention is the pio vision of improved starting means for a vaporizer of the character described. Another object is to deliver a substantially con stant type of combustible mixture to a furnace. 40 Another object is the provision of a starting system wherein full operation may be attained in a relatively short length of time. Another object is to start a vaporizing ap-` paratus with a minimum of loss of time, fuel and 45 energy. Another object is the provision in a vaporizing apparatus of a plurality of types of starting means whereby the vaporizing apparatus is ~adapted. for use with substantially any type' of 50_ process and under substantially any given set of conditions. Other objects and features of the invention will be apparent from a consideration of .the following detailed description taken with the ac 55 companying drawing, wherein the single figure shaped ,to` trap some of the combustible mixture 45 is sealed through the wall of the pipe 21 where it joins'the Venturi tube. This pipe withdraws combustible mixture which is burned by a pilot light 29. Hot gases of combustion are delivered from the pilot light to a passageway 3| and 50 thence to an extension 32 to the lower side of a bubble plate 33, supported below the level of liquid in the vapor chamber. This bubble plate preferably is perforated so as to subdivide the gases of combustion and cause them to bubble 55 2 2,123,884 up in a finely divided condition through the liquid hydrocarbon. The sensible heat of the com-> bustion gases causes a vaporization of a portion of the liquid hydrocarbon, the vaporized portion, of course, rising due to the suction of the aspirator through the connection I8 for corn mingling with the air at the forcing nozzle. Since the pilot light depends upon the produc tion of a combustible mixture for its operation, and since the production of a combustible mix ture is dependent upon the proper combustion of fuel at the pilot light, it is readily understood that the apparatus may, at certain times, pre sent some problems in starting, particularly where relatively very rapid starting is required and only the most satisfactory mixture delivered to the main burners. In accordance with one of the features of the invention, I provide an electrical resistance 36 beneath the vapor chamber supplied with elec tric current from a suitable source (not shown) by wires (not shown), the vapor chamber being preliminarily heated by passing an electrical cur rent through the resistance element 36. In starting, the vapor chamber is ilrst drained by closing valve 31 and opening valve 38 in the drain pipe 39. With no liquid in the vapor cham ber, the heat produced by the heat element will raise the temperature of the entire combustion 30 chamber. When now, liquid fuel is admitted, a portion of the liquid fuel will. be vaporized by contact with the heated surfaces and if the blower is started at the same time a mixture will be produced sufficiently rich to burn at the pilot As the pilot light continues to burn the 35 light. relative amount of fuel vaporized will be in creased and very shortly substantially operat ing characteristics will be established. The lvapor chamber may be heated before the I may, for example, heat it with an ordinary blow torch, but preferably by backing lup nut 4| on the pilot light to form an opening to which the blow torch can be applied. By then operating 45 the blower, the .torch flame will be drawn through the passageway 3| and will have the effect of rapidly heating the vapor chamber and all por tions of the apparatus immediately associated therewith. 'I'he liquid fuel may then be admitted 40 admission of the fuel thereto by other means. fore facilitates starting, it will have substan tially no effect upon operation of the apparatus. To avoid delivering an improper mixture to the burners of a commercial furnace, I provide a three-way valve 46 in the line 2l running to the manifold 47. This manifold is shown only schematically, it being understood that it may consist of a number of branches to deliver a com bustible mixture to a number of burners. The three-way valve has a core of a suitable and 10 usual type through which a main passageway 48 is provided, this passageway being connected by a radial passageway 49. With the valve set in the position indicated in the drawing, the two passageways co-operate to deliver the air and 15 vapor mixture to a pipe 5|. Thus the flow of these gases to the manifold is cut off and it is impossible to deliver an undesirable mixture into the furnace. By means of the system described, it is obvious 20 that the vaporizing apparatus may be started under substantially any condition in a relatively short length of time to produce the maximum amount of vaporized hydrocarbon after which the operation proceeds in a normal manner. Reference is hereby made to my copending application, Serial No. 647,392, filed December 15, 1932, which discloses subject matter in the form of apparatus similar to that shown in the pres ent application. 30 I have described my invention in detail to permit those skilled in the art to practice the same. I am not limited, however, to the specific forms of the invention shown and described, ex cept insofar as they are defined in the appended 35 claims. What I claim as new and desire to protect by Letters Patent of the United States is: 1. In a fuel vaporizing apparatus, a vapor chamber, an aspirator including a forcing noz zle and Venturi tube, means for delivering air at a high velocity through the forcing nozzle, a connection between vthe vapor chamber and Venturi tube near said forcing nozzle whereby fuel vapor is entrained with the air and mixed 45 therewith, means for withdrawing an air and vapor mixture as it leaves the aspirator, a pilot light for burning said air and vapor mixture; means for delivering hot gases of combustion 50 and vaporization will be established sufficiently from the pilot light to the lower portion'of the immediately to initiate operation of the pilot vapor chamber, means for maintaining a pool of liquid fuel in the vapor chamber at a level above that at which said hot gases are delivered. light. As to the medium of starting under certain conditions, I also provide a gas inlet 42 con 55 trolled by a valve 43 and connected to a gas main or suitable source of gas supply by a pipe 44. 'I‘his gas inlet 42 projects into the blower pipe 22, Where it joins the forcing nozzle so that gas in amounts determined by the regulation of the 60 valve 43 is delivered directly into the air stream. The gas so admitted can, if advisable, be burned at the main furnace burners (not shown). Its principal utility, however, is to enable the opera tor to start the pilot light immediately whereby 65 hot gases of combustion may be produced by the pilot flame and vaporization of the liquid fuel in the >vapor chamber is started at once. As the amount of hydrocarbon vapor increases, the valve 43 is gradually cut oif to diminish the 70 amount of gas introduced until substantially the maximum amount of vaporization is reached, at which time the gas is entirely cut off. The gas inlet is so arranged that it interferes to a sub stantially negligible extent with the movement 75 of air through the blower pipe. While it there and means for mixing a supply of gas with the air before it passes through said forcing nozzle. 65 2. In a fuel vaporizing apparatus, a vapor chamber, an aspirator including a forcing nozzle and Venturi tube, means for delivering air at a high velocity through the forcing nozzle, a connection between the vapor chamber and Ven turi tube near said forcing nozzle whereby fuel vapor is entrained with the air and mixed there with, means for withdrawing -an air and vapor mixture as it leaves the aspirator, a pilot light for burning said air and vapor mixture, means 65 for delivering hot gases of combustion from the pilot light to the lower portion of the vapor chamber, means for maintaining a pool of liquid fuel in the vapor chamber at a level above that at which said hot gases are delivered, and an 70 electrical heating element disposed in contact with the vapor chamber. 3. In a fuel vaporizing apparatus, a vapor chamber, an aspirator including a forcing nozzle and Venturi tube, a connection between the 75 3 2,128,884 vapor chamber and Venturi tube near the forc ing nozzle, means for delivering air at relatively high velocity through the forcing nozzle to with draw vapor from the vapor chamber, means for withdrawing mixed air and vapor from the as pirator, means for burning said mixed air and vapor, means for maintaining a pool of liquid fuel at a predetermined level in the vapor cham ber, means for delivering the hot gases of com bustion to the vapor chamber beneath the level of the liquid fuel therein, and means for heating the vapor chamber to initiate starting before the admission of fuel to the vapor chamber wherein said heating means comprises an elec 15 trical heating element disposed in contact with the vapor chamber. ` 4. In a fuel vaporizing apparatus, a vapor chamber, an aspirator including a forcing noz zle and Venturi‘tube, a connection between the 20 vapor chamber and Venturi tube near the forc ing nozzle, means for delivering air at relative ly high velocity through the forcing nozzle to withdraw vapor from the vapor chamber, means for withdrawing mixed air and vapor from the aspirator. means for burning said mixed air and vapor. means for maintaining a pool of liq uid fuel at a predetermined level in the vapor chamber, means for delivering the hot gases of combustion to the vapor chamber beneath the level of the liquid fuel therein, and means asso ciated with the chamber to heat the chamber to initiate starting. . 5. A liquid fuel vaporizing apparatus compris ing a vaporizing chamber for holding a pool of 10 the liquid to be vaporized, an aspirator includ ing va forcing nozzle connected to said vaporizing chamber, means for delivering air under pres sure through said forcing nozzle whereby fuel vapors are withdrawn from said vaporizing cham ber and entrained in said air, means for pass ing hot gases of combustion directly into and beneath the surface of the pool of the liquid fuel within said vaporizlng chamber, and inde pendently operated means associated with the 20 vaporization chamber for initiating vaporization of said liquid fuel. CLYDE B. FAVERTY.