US1136175A - Boiler-furnace. - Google Patents

Description

M. W. SEWALL.

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Patented Apr. 20, 1915.

M. W. SEWALL.

BOILER FURNACE.

APPLICATION FILED NOV. 26, 19,12.

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WITNESSES" M Arm/MEN,

rangements MINOTT W. SEWALL, OF NEW COMPANY, OF BAYONNE,

YORK, n. Y., assrenon TO THE BABCOCK & wrncox new Jersey, A conrona'rron on NEW JERSEY.

BOILER-FURNACE.

aser 72 5. Original application filed May 27, 1912,

To all whom it may concern Be it known that I, MINOTT a citizen of the United States, residing at New York city, borough of Manhattan, in the county of New York and State of New York, have invented certain new and useful Improvements in Boiler-Furnaces, of which the following is a Specification.

The present application is a division of my application, Serial No. 699,800, filed May 27, 1912 upon which Patent No. 1,06-l,175 has been granted dated June 10, 1013'. In that application I have described certain improvements upon the furnace constructions shown in my Patents Nos. 983,000 and 983,170 granted January 31, 1911. In the construct-ions shown in said patents the greater part of the dust that passes over from the furnace naturally falls to the floor behind the bridge wall. It isthere subjected to the reflection of the heat and becomes fused into a solid mass on the floor of the it. This mass is very dillicult to remove, as when cold it is a solid mass of clinker. 11? the pit is made of sullicient depth, so that the temperature at the bottom is not Sullicient to fuse the dust, the latter may be ,easily removed. If, however, it is allowed the top of the bridge to build up too near becomes fused and wall, the surface of it becomes a solid mass as before mentioned. This is a real diiliculty, and one that isnot easily overcome without considerable expense in construction and attention in op eration.

Several arrangements have been used by different makers of chain grates to cover the rear end of. the grate and.at the same time to pass any unburned carbon over the covering parts and discharge them behind the grate on either an auxiliary dumping grate or a dumping plate. Some of these arrangements have been made in the form of a hollow casting which covers the top of the rear of the grate and is formed with a slope toward the front of the grate so as to permit the unburned carbon to pass over it easily. This casting was filled with water so as to prevent its burning out. Other arbave been made having solid covering plates or bars tapered toward the front. These havebeen made of various grades of iron and steel, the efiorts having Specification of Letters Patent.

TV. SEWALL,

Patented Apr. 20, 1915.

Serial No. 699,860. Divided and this application filed November 26,

1912. Serial No. 733,584.

burned carbon from passing over has led.

to the adoption of a water back, such as shown in my Patent No. 9-l1,557 granted November 1000. A brick bridge wall is also sometimes used to compact the ash and permit the fire to pass under. This is, however, a very inellicient arrangement. Either the water back as mentioned or the brick construction permits a certain amount of unburned carbon to pass over the rear of the grate, which carbon falls into the ashpit. If the ashpit is not cleaned at proper intervals the carbon and ash fill the pit and burn, and such a temperature is produced that the rear of the grate is heated to a detrimental degree. In order to prevent this heating, .1 have designed a stripper to be used in combination with a water bridge wall, or with a brick bridge wall, as mentioned. This stripper extends from approximately the tangent point otthc rear curve of the grate downwardly and causes any ash or unburned carbon to pass over it into a pit behind the grate and does not permit the ash to pass into the space under the grate. The pit be hind the grate may be simply an ashpit or it may contain a grate on which the ash and unburned carbon may fall and remain there until the carbon is burned out, the ash being removed periodically. In said Patent No. 941,057, a rectangular box IS shown. The

of al- 0 The invention will be understood by'reference to the accompanying drawings, in which" Figure 1'is a vertical longitudinal section Fig- 2, a sectional plan view on the plane of line 22 of Fig. 1 athe left-hand portion oi Fig. 3, a. vertical cross-section on the plane of the line 3-3 of Fig. 1, the right-hand 1- 1s a View of an enlarged portion ,of they Referring to the drawings, the numeral 1 designates the boilercasing, in the upper part of which are located. the heating surfaces and other parts ofa boiler not here shown. have described the sidetubes 2 and their connection With the' water circulation through the manifolds 8 and 4. At the rear of the traveling grate 5 is a Water box 6, and extending along both side walls approximately at the grate level, are water boxes 7.. A second cross box 8 is placed above the box 6, and these two boxes form ,the bridge wall of the furnace. The water supply for thls box system is from the rear manifolds 3 through tubes 9, the forward ends o't said tubes entering the under side of boxli near its ends. Box 8 receives its Water supply from box 6 through nipples 10 near the center of said boxes. The side boxes 7 receive their supply from box 0 through nipples 11, and'their Water discharge is through two pipes 12 at their forward or elevated end, into a box, not shown. Box 8 has its discharge through pipes 13 into the front manifolds t, and also through pipes 15 into a box, not shown.

immediately to the rear of box 6, and extending toward the mud drum 16 l have introduced av screcn'of water tubes 17. This screen extends across the furnace, the ends of the tubes 17 being expanded into the manifolds 1S and 1f), the latter being at a higher level than the former in order to give an inclination to the tubes 17. ,The water supply to n'ianit'old 1S enters from one of the manifolds 3 through nipple 20, the circulation passing through tubes 17 into manifold 19, and from the latter into box 8 through a nipple 21.

it will be seen that I have modified the Furnace ol my said Patent No. 983,000 by introducing a screen of water tubes behind the bridge wall, which will largely prevent the rrllection ot' the heat from the combust onchamber downwardinto the pit behind the bridge wall.

For the purpose of passing theash and fuel refuse over the rear end of the grate 51 I provide a shield or stripper extending preferably from approximately the rear edge ottho water box 0, 0' approximately the tangent point of the curve of the grate. It is, however, not absolutely essential that this shield sln'iuld reach as high on the grate as above stated, as a partial protection of the grate may be secured by having the upper edge ol the shield as low, or perhaps lower, than the center of the sprocket shaft,

In my said Patent No. 1,064,175 I one purpose of the shield being to conduct the ash and fuel. refuse which pass under the bridgewall over the top of the shield may froin thc grate -and thus to preterit hot or burning material being discharged underuthe grate.

llonthe purpose of cll'ecting complete combustion of any umronsuincd carbon. which may be dischargml over the rear of the grate, I provide an auxiliary furnace having'a grate or floor 1.3, one. of the side walls of this furnace chamber providing a convenient means to which the shield or stripper may bo'sccurcd, as shown in Fig 1. The products of combustion from this auxiliary tturnace pass directly up between the tubes 1? and mingle with the products oil combustion fr m the lurnaco proper. An ash receiver 2-1 will receive the ash from the auxiliary furnace, said receiver being made air-tight with a. controllable air entrance E25. A. rcceirer 26 below the traveling grate receives any tine coal that may lcal; through the grate. This means of disposing of the ash and fuel rol use prevents the hunting ol' the rear of the tin-ivcling grate and thereby obviates the objections before noted.

What .l: claim and desire to secure by Letters Patent oi the llnited States is:----

l. A'boiler l'urnacc having a traveling grate, a bridge wall above the grate at the rear, a shield in proximity to the roar cnrvaruro oi the grate, a pit for the ash and. tool refuse which discharged between the grate and the bridge wall over said shield, anua series of water tubes i'orininn; a shield for said pit for the purpose dosrrilrwl.

2. boiler furnace having a grate, a pit at the rr-ar oil' the grate, means for discharging the ash and 'rlllfl refuse from the grate into said pit. and a series oi" \valor tubes forming a shield over said pit for tho pnrpose drscribcd.

53. A boiler furnace having a grate, a pit at the rear of the grate below the rear of the furnace comlnrstionrhamlm. means For causing the ash and tool refuse to discharge From the grate into said pit, and a series of water tubes forming a shield over said pit said tubes being ronncrlml circulation.

l. .l. boiler furnace having a grate, a bridge wall, a pit at the roar f the grate, means for causing the ash and l'ucl rolusc to pass und. -.r the bridge wall and beyond 3 with the boiler the grate into said pit, and a series of water tubes Forming a screen above said pit For the purpose (loser-died.

' 5. A boiler furnace having a traveling grate, a water-box bridge wall above the grate at the rear, a shield or stripper cxtending from the rear curve of the grate downwardly, a pit beyond the grate for tho ash and fuel rcluse discharged between the grate and bridge wall over said shield, a, signed my name in the presence of two subwull sepurutlng [be plt from the space bescrlblng \vltnesses.

neuth the grate. means for supporting the x 1 r r 1 ilIk Fl SEWALL. unburned tuel J11 tne plt, and a heat-ubsorb- 0 mg n'xelnber lucuwl between the plt and Nltnessesz steam generator. M. 1). McNlxol-l,

in testimony \vlureof I have hereunto CHARLES S. JONES.

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