US1652845A - Soot-blowing system - Google Patents

Description

Dec. 13, 1927. 1,652,845

G.v C. VEN NUM SOOT BLOWING SYSTEM Filed Oct. 13. 1924 v s sheets-sheet o o o o 00 0 00 o e Dec. 13, 1927;

1,652,845 G. c. VENNUM SOOT BLOWING SYSTEM Filed Oct. 13. 1924 5 sheets-sheet lllll Dec. 13, 1927. I 1,652,845

7 G. c. VENNUM SOOT BLOWING SYSTEM Filed 001;. 13. 1924 3 Sheets-Sheet 3 gala Patented Dec. 13, 1927.

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GEORGE CARL VENN'UM, 0F WILMINGTON, DELAWARE, ASSIGNOIR- TO EDGE MOOR IRON COMPANY, 0]? EDGE MOOR, DELAWARE, A CORPORATION OF DELAWARE.

SOOT-BLOWING SYSTEM.

Application filed October 13, 1924. Serial No. 743,251.

My invention relates to soot blowers for boilers and has for its object to provide a soot blowing system in which a multiple series of groups of soot'blowing elements are brought into operation successively and by automatic means controlling the opening and closing of valves which effect the admis sion and cut off of steam to the different groups. The valves which I have devised for controlling the steam admission to the groups are so constructed as to be self opening, that is, to tend to open under the pressure of steam admitted to the valve casing and are provided with means by which the admission of pressure fluid to a. second chamber in the casing efiects the closure of the valve. Another important feature of my invention is the provision of a valve, generally similar to the valves controlling the steam admission to the separate groups,

and which valve controls the admission of steam to a series of such groups and cuts oil the admission of steam after the separate group valves have been successively operated. Another important feature of my invention is the provision of a series of pilot valves which operate to control the fluid pressure in the second chambers of the valves already mentioned.

best understood as described in connection with the drawings in which Figure l is a diagrammatic view showing groups of soot blowing elements, their controlling valves, a valve controlling the ad- -mission of steam to a group of controlling valves, a pilot valve system and mechanism for imparting motion to the cams which in turn control the motion of the pilot valves.

Figure 2 is a sectional elevation of one of my group controlling valves. I

Figure 3 is a similar elevation of a modified form of group controlling valve.

Figure 4 is a plan view partly in horizontal section of the pilot valve structure adapted for use with central valves such as are shown in Fig. 3, and p Figure 5 is a cross section on the line 5'-5 of Fig. 4.

Figure 6 is a sectional plan view of a modified system of pilot valves adapted for use with control valves of the construction shown in Fig. 2.

The nature of my improvements will be the cylinder 0*.

B, B, etc., soot blowing elements provided with the usual nozzles B and united in the groups by means of headers B which receive their steam through steam pipes 13 through group valves 0 from a steam supply pipe F; F indicating the main' supply pipe through which a number of supply pipes F can receive steam and CG, indicatmg a. valve of the general character of the valve C which controls the flow of steam from the pipe F to the conduits F.

The valve C consists of a casing having a steam inlet port 0 and an outlet port C separated by a valve seat C immediately in llne with which there is formed in the casing a cylinder C of somewhat greater diameter than the valve seat G into which leads a port C having a branch port C leading to the top of the cylinder 0* and provided with a non-return valve indicated at E.

Located in the casing of the valve C is the valve D guided so as to move to and away from the seat G and firmly secured to a piston D working in the cylinder C and provided with snap rings, as indicated at D which rings are so located that when the piston moves up the openingof the port G into the wall of the cylinder lies between two of the snap rings. It is advisable that when the valve D is closed the top of the-piston D should be practically flush with the port C as shown in Fig. 2.

.In the modified construction of group control valves the steam enters through the port 0 and passes out through the port 0 The valve seat 0 lies in the casing between these ports and, as in the other'form of valve, a cylinder 0 is formed in the casing above the valve seat or in line with the valve seat and'the fluid port 0 enters the side of In this construction, however, a restricted port 0 extends from the steam entrance side of the valve into the upper portion of the cylinder 0. cl is the valve which is hereshown as virtually an extension of the piston d and isprovided with a downwardly extending arm with a flange d at its end.

G, G, and G, are pipes connecting the control valves with individual pilot valves oi the system to be described. This pilot valve system shown in Figs. 4 and 5, which is adapted for use in connection with valves such as are shown in Fig. 3, consists ofa casing H having a centrally located chamber I-I connected to exhaust through a pipe 0. This ing radially inward and opposite to these ports I provide an annular rim I-I having radial guide-ways, H in line with the radial ports H.

bers H with one or more steam chambers h having valve seated ports It connecting with the insideof the casing and the casing is provided with a rim 71. with a valve .guid-.

ing perforation h lying in line with the port 72,, The chamber 72, connects with the pipe G. I, I, etc'., and z are valves adapted to seat on the ports H and h and having stems I and i which extend through and are guided by the perforations H and h the ends of these stems being so disposed as to lie in the path of the rotating cams, to be described. The chambers H and k are shownas having screwing into them the caps J containing springs J which normally keep the valves I and '5 closed.

Secured to the shaft K are 'the cams K and K The cam K is shaped so as to suecessively open-and close a series of valves I and the cam K is formed so as to open the valve i and keep it open'during the period when the cam K is acting on the series of pilot valves I, permitting it to close after all the pilot valves have been successively actuated.

In the pilot valve system of Fig. 6, which is adapted for use with control valves such as are shown in Fig. 2, and operated as in the described system of Figs. 4 and 5, by cams .K and K, the casing HH is formed with an annular live steam chamber HH supplied with steam through a pipe F and with a series of chambers HI-I arranged in a circle and connecting with the steam chamber HH through ports hh and to exhaust through port-s HH. Through each chamber HH ex tends a radial valve stem having secured to it valves II and it" and by means ofsprings J in caps J the valve ..stems are pressed inward so as to seat valves II on ports HH and hold 'valve ii away from ports hit. As cam K contacts with each valve stem II the valve II opens exhaust port HH and valve ii closes, steam port kit. Each chamber HH has leading into it one of the pipes G leading to a control valve casing. I

The pilot valves are actuated, as shown in Fig. 1, by an electric motor N actuating The casing H is also providedat a lower level than the level of the chamis opened at each revolution of the Geneva drive L by the finger L Another circuit is formed by the wires P and P and the normally open switch Q, which can be closed to start the motor, or this can be done autoinatically by a clock actuated switch S connected to the wires P andjP which connect with circuit wircs P and P; i

In operation and considering first asystem provided with valves such as are shown in Fig. 3 and pilot valves, as shown in Figs. 4 and 5, the pilot valve shaft K is brought to a rest in a position in which the cam K permits the valve 71 to remain closed and the cam K, as shown in Fig. 4, does not open any valve I. In this position of the pilot valves the piston (Z of valve CC, Fig. 1, is held closed by steam admitted to the top of cylinder c lthrough the restricted port 0 The shaft K is then rotated by the mechanism described, set in operation by closing switch Q or clock switch S which promptly results in the closing of switch Q, and the cam K opens valve '5 permitting the steam in cylinder 0 of ..valve- CC, to exhaust through pipe G, chamber k and port it whereupon the steam in casing c acting on the piston 01 opensvalve d, permitting steam to pass from main F to conduit F and into casings CC. The flow of steam into casings CC, etc. doesnot open the valves Z because it finds its way through restricted passages 0 into the tops of cylinders c and acting on the piston 03 holds the connected valves seated until the cam K opens, as it does successively, the series of pilot valvesI, I, etc. As each pilot valve I is opened the corresponding cylinder 0* is connected to exhaust with the resultthat the valve (1 in the connected casing c is opened as described and successively closed as the cam-K permits its pilot valve I to close and the cylinder of the casing c is recharged with steam through the. passage 0'. I provide the valve d with the flanged disc d cextending into the outlet passage 0 for the reasonthat it, being pressed upon by the flowing current of steam, helps in the closing of the valve 61.

In the modified construction of Figs. 2 and 6, each chamber HH of the pilot valve structure is connected through a pipe G with the port G of a valve casing C and through a normally open port kit with the live steam chamber HH so that the valves D are normal'ly held seated by the live steam in cylinder C and as the area of piston D'exceeds that of valve D the admission of steam to casing C does not open valve D. As cam' K revolves it successively closes the ports 7th by valves ii and opens ports HH to exhaust by opening valves II, whereupon the steam in connected cylinder C exhausts through chamber HH and the pressure in casing C acting on the lower side of piston D opens valve D. As the cam K leaves contact with the valve stem II the valve II closes and valve ii opens admitting steam to chamberI-IH and through connected pipe G to port C and through branch port C to the top of cylinder (1* with the effect of forcing downward piston D and closing valve D. The effect of the location of non-return valve E in port C is to prevent the escape of steam from the cylinder through this port and in sure a steam cushion in the top of the cylinder to check the upward motion of the piston in the opening of the valve D.

At the completion of a full rotation of cams K and K the finger L -on Geneva drive L opens switch Q, and breaks the circuit so that the cams come to a rest through the stopping of the motor N.

- It will be obvious, of course, that my device will work equally well with compressed air as with steam and I wish my claims to be understood as applied to the use of the specified mechanism with either air or steam as the soot blowing medium.

Having now described my invention, what I claim as new and desire to secure byLetters Patent is,

1. In a' soot blowing system comprising a plurality of groups of soot blowing nozzles and steam supply pipes leading to each group, means for successively opening and closing the connections between the supply' pipes and said groups comprising a valve casing in each supply pipe having a valve containing chamber and a second chamber separated from the first by the valve actuating means, a valve and valve actuating means in each casing, said means being operated by fluid pressure and tending to open the valve when steam is admitted to the part of the casing in which the valve is situated and to close the valve when pressure fluid is admitted to the second chamber of the casing,

a series of pilot valves, one for each valve casing, connected with the second chamber of the casings and acting to control the pressure in the second chamber and means for successively opening and closing said pilot valves so as to successively open and close the valves in the caslngs.

2. In an apparatus having the features of claim 1, the use in combination therewith of a main valve of like construction to the valves of, the supply pipes controlling the flow of steam to a group of supply pipes, a pilot valve for said main valve and means for actuating said pilot valve to open it in advance of the operation of the means acting on the pilot valves controlling the operation of the supply pipe valves and close a cylinder connected to the pilot Valve by a port which is closed by the piston when the valve in the casing is fully open and in which the valve actuating means consists in a piston working in said cylinder.

5. Ina soot blowin system comprising a plurality of groups of and steam supply pipes leading to each group, means for successivelyopening and closing the connections between the supply pipes and said groups comprising a valve casing in each supply pipe having a valve. containing. chamber provided with a valve seat and a cylindrical chamber in aligned relation to said valve. seat, a valve and a valve actuating piston attached thereto and working in the cylindrical chamber, said piston tending to open the valve when steam is admitted to the valve chamber and to close the valve when pressure fluid is admitted to the cylinder, a conduit for pressure fluid opening into the cylinder at a distance from its rear end, a bypass conduit opening into the rear end of the cylinder, a nonreturn valve in said bypass arranged to prevent flow from the cylinder, a source of fluid under pressure, a series of pilot valves one for each valve casing connected to the cylinder of the casing and to the source of fluid under pressure said pilot valves acting to connect the cylinders to the source and-to exhaust and means to surcessive-ly open and close said pilot valves sovas to successively open and close the valves in the connected casings.

GEORGE CARL VENN UM.

soot blowing nozzles

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