US 1404429 A
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Description (OCR text may contain errors)
W. C. BUE LL, JR., AND W. H. SCHEIB.
HYDROCARBON BLAST BURNER.
APPLICATION FILED MAR. l4, 19l8.
Patented Jan. 24, 1922.
INVENTORS WITNESSES www UNITED "STATES PATENT) OFFICE.
WILLIAM c. BUELL, an, or osnomrn sonouon, AND WALTER H. scams, or PITTS- BURGH, PENNSYLVANIA, Assienons 'ro TATE-JONES & 00., ms, or rr'rrsnunon, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.
HYDROCABBON BLAQI BURNER.
eone-ea Specification of Letters Patent.
Patented Jan 251-, 11922.
Application filed'liarch 14, 1918. Serial li'o. $522,453.,
Borough, Allegheny County, Pennsylvania,
and Pittsburgh, Allegheny County, Pennsylvania, respectively, have invented a new and useful Improvement in Hydrocarbon Blast Burners, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is a longitudinal-vertical section showing a liquid fuel burner constructed in accordance with our invention, and
Figure 2 is a side elevation of the same.
Our inventiomrelates to the blast burners for liquid hydrocarbon fuels wherein a fluid, such as steam or air is employed asan atomizing agent. In such qstems, it is important for eificient atomization thatthe atomizing agent be maintained at a high velocity at the meeting point with the fuel from the nozzle, inasmuch as velocity has a direct atomizing function. Velocity is a function of pressure drop and frictional resistance.
It the pressure of the atomizing agent is varied by a remote valve control the elliciency of atomization wlll be greatly reduced as the pressure is reduced.
Furthermore, the velocity of the atomizing fluid has an. important effect on the proportion of secondary air induced for com hustion; and we have found. that by the use ofour invention' a, very large proportion of the total air can be induced by the action,
of a relatively small amount of primary air flowing through the burner tip.
Our experiments have shown that it is highly desirable that the static of air, steam or other atomizing agent be maintained at a high point to the meeting point of the fuel and atomizing agent, so that maximum velocity and consequently highly efiicient atcmizing and inductivefisction for secondary air be secured. H
In our invention the static heed of the etomizing agent is maintained sulostantially v constant at the nearest practical point in a burner tip so as to give a condition of almost constant velocity, while at the same time the volume of the atomizing agent may-he varied at will. Fiirthermore', all sliding 1nternal fittings areohviated with the excep .tion of a-fitting which is packed only against low pressure air.
Furthermore, in our burner the amount of air supply is indicated by the position of an externally projecting control lever.
'lnthe form shown in the drawings, 2 is the outer shell or casing of the burner having in its rear portion a cylindrical bore 3.
The rear end is closed by a hollow cap 4 to which the oil or other liquid fuel is admitted through the'ipipe 5. Within the cylindrical bore 3 fits the hollow enlarged huh 6 of a sleeve 7 carrying a tip 8 at its forward end. 9 represents a suitable packiing for the hub which turnsand slides in the bore. The hub is actuated by a lever handle 10 having its inner end secured into the hub and projecting through a. helical slot 11 in the outer shell or casing. By actuating the handle, the tip may be moved forwardly or haclrwardly as the hub turns around within the bore. 7
Through the hollow hub and sleeve extends an inner tube 12 havingits rear end screwed into the rear hollow cap for the oil feed, while to its forward end is screwed the fuel tip 13, which projects through the outer tip with its forward end practically flush with-the hole in the burner casing. The usual needle valve 14 controls the flow of liquid through to the fuel tip, the rear end of the needle stem being screw threaded. and extending through the rear cap with an actuating handle 15.
With the parts in the position shown, when the lever is actuated to turnthe hub of the outer tip, this tip is moved forwardly over the stationary fuel tip, thus reducing the effective area of the holein the outer burner shell, and throttling the volume of At the same time the velocity of flow (if the vatoinizing agent is held substantially umform, because the pressure on the inside of the external burner shell remains uniform under the supply from the duct 16 501; the primary pressure air, while the atmospheric pressure, of course, remains the same at the opening of the burner assembly.
It Will be understood that the maximum opening of the annular nozzle between the shell 2 and the tip 8 is small compared to the cross sectional area of duct 16 so that the line pressure is maintained in the con duit 16 even with the maximum useful openunder varying volume of the atomizing agent as changed by the operator.
The enlarged hub bearing keeps" the tip 6 concentric with the outer nozzle or burner shell and this tip also acts as a guide for the fuel tip, thus maintaining the three in concentric position.
Changes may be made in the form and arrangement of the parts without departing from our invention.
1. In liquid fuel blast burners, a casing having a side inlet for the atomizing fluid and provided with a gradually contracting outlet, a stationary axially located fuel supply tube within the casing provided with a central longitudinal needle valve adjacent to the fuel outlet, and an intermediate concentric sliding sleeve between the casing and fuel tip and having a throttle tip between the fuel 'tip and the casing, the rear portion of said intermediate sleeve having packing in the rear of the casing inlet and provided with operating means in the rear of said packing, substantially as described.
2. In liquid fuel blast burners, a hollow burner shell having a nozzle and containing a bore in its rear portion, a sliding hub within the bore having an actuating handle projecting through the burner shell, the hub having a member provided with a front throttling tip co-acting with the hole'in the burner shell, a stationary oil supply extending through the hub and throttling tip and provided with a fuel tip' extending through the throttling tip to the point where the atomizing fluid and the oil combine, and a needle valve for the fuel tip; substantially as described. I
3. In a liquid fuel burner, an outer casing, an inner stationary fuel supply tube, an intermediatetube between the casing and the supply tube adjustable longitudinally of the casing, a packing between the casing and the intermediate tube, the casing having a helical slot on the atmospheric pressure side of the packing, and a handle connected to the intermediate tube and movable in the helical slot of the casing, substantially as described.
set our hands.
WILLIAM C. BUELL, JR.
WALTER H. SCHEIB.