US1392921A - Apparatus for burning gases - Google Patents

Description

A. N. DIEHL AND F. if. LEAHY.

APPARATUS FOR BURNING GASES.

AVCATIUN Full) JAN Z7., |921. LEQQQQZL Patented Oct. H, i921.

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A. N. DIEHL AND F. E. LEAHY.

APPARATUS FOR BURNING GASES.

APPLICATION HLLD 1AN.22, |921.

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A. N. DIEHL AND F. E. LEAHY.

APPARATUS FOR BURNING GASES.

APPUCATION FILLD 1AN.22. |92l.

1,392,921, Patented Oct. 11, 1921.

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AMBRGSE N. DI'EHL, OF DUQUESNE, AND FRANK E. LEAHY, @F MCEEESPORT,

, PENNSYLVNIIA.

APPARATUS FR, BURNING GASES.

Application led January 22, 1921.

To all Lo/"tom it may con-cern.'

Be it lrnown that we, AMBRosE N. Dmitri. and F raux E.. LEAHY, citizens of the lUnited States, and residents, respectively, of Duquesne and Mclieesport, both in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Apparatus for `Burning Gases, of which the following is a specication.

This invention relates to the burning of gases, and more particularly to mechanism for regulatin and controlling the relative amounts of air and gas supplied to the gas burner and also having means to control the draft from the burner so as to properly exhaust the products of combustion.

The invention is illustrated as applied to a battery of steam boilers utilizing blast furnace gas for fuel, although it will be understood that this invention may be used with all fuel gases.

The principal object of our invention is to provide improved means for securing the correct amount of air for the volume of gas iiowing through the burner, and also to au tomatically control the draft drawing the products of combustion away from the burner.

Another object of the invention is to provide suitable automatic-apparatus for con trolling the inflow of air to the burner and outflow of the products of combustion.

Still another object of this invention is to combine the improved and novel appae ratus in such manner so that the gas entering the burner will. be mixed with air in suitable proportions to get the maximum heat therefrom at all times.

TVith these and other objects in view, our

invention as applied to a. battery of steam.

boilers is illustrated in the accompanying drawings, in which- Figure 1 is an end elevation of a battery of boilers having our invention applied thereto.

Fig. 2 is a somewhat diagrammatic elevation of the control apparatus' on a larger scale,

Fig. 3 is a sectional elevationof the regulator.

Fig. 4 is a sectional view of the lever balance valve.

Referring particularly to the drawings,

the letter A designates the boiler house gen- Specification of Letters Patent.

Patented 0pt. 11, 192L serial No. 439,3QQ.

erally, which houses the battery of boilers 2each of'which has one or more gas burners 3 'passing through its forward wall for supplying heat to the boilers. The burners for each boiler receive their gas supply from suitable manifolds t connected by a branch main 6 to the gas supply main 7. The branch main 6 is provided with a suitable hand operated butter-ily valve 6 to control the flow of gas to the manifold d.

rlhe burners 3 forv` each boiler are provided with a forced draft or air supply by a turbo-driven fan 8 connected by main 9 to an air manifold 10 which supplies air to the burners through suitable branches 11 leading from the air manifold into the mixing chamber of the burner.

rlhe induced draft to carry away the products of combustion is formed by a second turbo-driven fan 12 communicating with the boiler flues in awell lrnown manner and exhausting through a flue or stack 13.

The turbo-driven fans 8 and 12 are each supplied with steam from the boilers 2 through a branch steam main 14 having branches 15 and 16 leading to the turbos and provided with suitable throttle valves 17 and 18 respectively. A

@ur invention pertains principally to the control of the steam entering the branch main l by means of a lever balance valve 20 which is in turn controlled by the gas pressure in the gas manifold d. i

The gas pressure from the manifold, which is proportional to the flow of gas through the burners, is applied through a suitable large diameter' main 22 having a small diameter branch 23 to an incremental type of regulator X which operates the valve 20.

'll`he regulator X comprises a casing 25 having a pressure'operated diaphragm 26 mounted. therein provided with a plunger rod 27 which extends downwardly through a pilot valve 32 and has its lower end pivotally secured to the short end-of a fulcrumed lever arm 29, the other end of which carries a sliding weight 30. A suitable fluid pressure cylinder 31 adapted to'control the movement of the sliding weight 30 is also provided in the regulator, and fluid under pressure is admitted to the cylinder through the pilot valve 32 which is operated by the plunger rod 27.

rThe iiuid pressure cylinder 31 has a double acting piston 34l mounted therein, having a piston rod 35 which extends through the stuffing box 36 and gland 37 on onel head of the cylinder. The outer end of the piston rod is connected by a flexible connection such as chain 39 to a variable angular transmission wheel 40 which is mounted on a suitable standard 41.

The piston rod is also connected bya pivoted link 38 to the sliding weight 30 so as to cause said weight to move along the lever 29 as said piston rod is reciprocated.

The cylinder 31 is provided with a port 42 opening into the cylinder at one end thereof and extending longitudinally through the cylinder side wall. The ilot valve 32 is secured directl to the forward end of the cylinder 31 an has ports 48 in communication with port 42 in the cylinder and a second port 49 opening directly into the cylinder.

The pilot valve 32is a four-way valve havi in g an inlet port 50, which may be connected by Suitable piping to a source of fluid ressure, and an outlet port 51 which may e connected by suitable piping to a drain or waste conduit.

The pilot valve 32 is provided at each end with a stuffing box 56 and gland 57, through which the plunger rod 27 reciprocates. In the partlcular pilot valve construction shown, the chamber for the piston is provided with a bushing 59 having two series of transverse' openings or holesn 60 and 61v therein, communicating with the iuid pressure ports 48 and 49 of the valve. The plunger rod 27 serves as a piston rod for the valve 32, and disks 62 and 63 are secured thereon to `form a double piston. rlhe disks 62 and 63 are arranged to move into and out of position to close the openings 60 and 61 in the bushing 59. The inlet port 50 of the valve opens into the upper end of the valve chamber. The space in the valve chamber above the disk 62 is connected b -a discharge passage 65 with the space be ow the disk 63, the arrangement being 26 the valve inlet A5() will be connected to the fluid ressure cylinder through port 49 while tile valve outlet port 51 will be connected to the port 42 by port 48 and when the valve piston is moved upwardly, the ports will be oppositely connected so as to admit water Aor other fluid pressure to the cylinder on the other side of the piston 34 and cause the iston to move in the opposite direction within Ithe Huid pressure cylinder. Preferably water will be the fluid used in the cylinder,although an elastic duid may be em loyed when neeessarv or desirable.

he lever balance valve 20 comprises a Casing 68 having an inlet chamber 69 formed such that when the disks are moved- 'downwardly by the depression of diaphragm forms an outlet chamber 74. The inlet i and outlet chambers 69 and 74, respectively, are connected with the branch Steam main 14 as will be obvious.

A head is formed -on the upper portion of the valve casing to provide for the lever operating mechanism. A crank lever 76 is journaled in the head 75 and has its arm pivotally connected to a link 77 which has its lower end pivotally connected to the piston valve. An operating lever 78 is rigidly mounted intermediate its ends 'on the other arm of the crank 76 and is provided with a suitable counterweight 79 at its rear end. Vertical movement of the lever 78 by a flexible member 80. The angular transmission wheel 4() is provided with a radial rod and the flexible member 80 is Secured by one end of this rod and passes upwardly over-an idler. pulle 81 and has its other end secured to the ever 78. The wheel 40 is also provided with a counterweight 82 secured thereto by a flexible .member 8,3 to provide means for revolving the wheel.

The idler pulley 81 is located a considerable distance to one side of the vertical axis ofthe angular transmission wheel 40 to provide the necessary angularity which gives a wide range of variationl in the operation of the valve 20.

rlhe operation of the device is as follows:

rllhe device beingassembled and in operation, a pressure corresponding to the flow of gas entering the gas manifold 4 from the mam 7,v is commumcated to the diaphragm 26 of the regulator 25 through pipes or mains 22 and 23. An increase in pressure l34 and piston rod 35 in the cylinder 31,

outwardly, and drawin lweight, 30 outwardly along `the weig t lever 29. The outward movement of the piston rod 35 will be communicated through the flexible member 39 to the 'transmission wheel 40 and therefore the counterweight 82 will move said wheel clockwise and allow the flexible member 80 to move upwardly, permitting the counterweight 79 to exert enough force upon the lever 78 to rock it and thereby open the valve 20 and allowing more steam to flow throu h the branch mains l5 and 16 to the turbo- 'ans 8 and 12.

This increase in the steam supply will increase the speed of both fans 8 and l2, thereby increasing the volume of air supplied to the burner 3 for combustion and increasing the amount of the products of combustion exhausted through the stack.

The piston rod 35, in moving outwardly, will move the weight 30 outwardly along the weight lever 29 due tothe link 'connection 38. When the weight reaches the oint on the lever 29 where it will counterba ance the gas pressure, it will overbalance the lever 29, thus pushing up the plunger 27 which will in turn press upon and move upwardl into its normal position, thereby closing t e pilot valve 32.

When the gas pressure decreases the weight 30 will further overbalance the lever 29, thus moving the plunger 27 upward still further, pushing up the diaphragm 26 above its normal position and opening the pilot valve 32 so as to admit fluid under pressure through the port 48 into the passage-way 42 inthe cylinder and openingport 49, thereby allowing the fluid in the rear of the piston 34 to exhaust and other fluid to enter in front of the piston and move it reawardly to its normal position. As the piston 34 returns to normal position it will return the weight 30 to its normal position, and also will exert power on the transmission wheel 40 through the liexible member 39, thereby revolving said wheel so as to talre up the flexible member 80, rock the lever 78 and thereby close the valve 20. vClosing movevment of the valve 20 will decrease the steam supply to the turbo fans 8 and l2, thereby reducing the capacity of these fans during the lack of gas pressure.

As the piston rod 35 moves inwardly, as has 'been said, the weight is moved along the rod 29. When the weight reaches such a point as to balance the gas pressure on the diaphragm, the dia hragm will return to normal, thus forcing own plunger 27 and closing the pilot valve ,32. The closing movement of the pilot valve 32 will cause the valve 20 to remain stationary until the gas pressure again iiuctuates, when the diaphragm 26 4w1ll again move upwardly or downwardly according to whether the gas pressure is decreased or increased.

Each movement of the diaphragm 26 will be communicated by the plunger 27 to the pilot valve 32 and cause one of the cycle of operations above described.

We claim:

l. The combination with a gas burner having separate turbo-fans for supplying air for combustion and for withdrawing the products of combustion, of means operated by the pressure of the gas supplied to said burner for regulating the speed of both of said fans, so as to provide the correct amount of air for combustion and the correct draft for the dierent gas pressures.

2. rlhe combination with a gas manifold `and burner, separate turbo-fans for supplying air to said burner for combustion and for withdrawing the products of combustion, and a single steam main for supplying steam from said boiler to said fans, of means operated by the pressure of the v gas in sald manifold for regulating the speed of both of said fans, said means comprising a diaphragm adapted to be operated by the gas, a pressure control valve in said steam main, and means controlled by the movements' of said diaphragm for operating said control valve.

3. The combination with a gas fired boiler having a gas manifold and burner, separate turbo-fans for supplying air to said burner for combustion, and for withdrawing the products of combustion, and a single steam main for supplying steam from said boiler to said fans, of means operated by the pressure of the gas in said manifold for regulating the speed of both of said fans, Said means comprising 'a control valve in said steam main, and an incremental type of regulator adapted to operate said control valve, said regulator being actuated by the pressure of the gas in said gas manifold.

4. The combination with a gas red boiler having a gas manifold and burner, separate turbo-fans for supplying air to vsaid burner for combustion and for withdrawing the products of combustion, and a single steam main for supplying steam from said boiler to said fans, of means operated by the pressure of the gas in said manifold for regulating the speed of both of said fans, said means comprising a control valve in said steam main, a variable angular transmission wheel connected to said valve and adapted to operate the same, and an incremental type of regulator adapted to operate said angular transmission wheel, said regulator being actuated b the pressure of the gas in said gas manifol 5. The combination with a gas fired boiler having a gas manifold and burner, an air manifold for supplying air to the burner, a stack for the products of combustion, a turbo-fan for supplyin air to said air manifold, a second turboan for drawing the products of combustion through said stack, and a singley steam main from said boiler for supplying to both of said fans, of a control valve in said steam main, a variable angular transmission wheel having a ilexibleconnection with said valve and adapted to operate the same, and an incremental type of regulator being actuated by the pressure of gas in said gas manifold.

6. The combination With a gas burner of 5 a turbo-fan for supplying air to support combustion, and means operated by the pressure of gas supplied to said burner for-regulating the speed of said fan so as to provide the correct volume of air to support ecient combustion at different gas pressures. l0

In testimony whereof We have hereunto signed our names.v

AMBROSE N. DEHL. FRANK E. LEAHY.

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