US1743918A

US1743918A - Boiler for evaporating or heating liquids

Info

Publication number: US1743918A
Application number: US350228A
Authority: US
Inventors: Hitchcock-Spencer Art Lincolne
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-03-23
Filing date: 1929-03-27
Publication date: 1930-01-14
Anticipated expiration: 1947-01-14

Description

Jan. 14, 1930. A. HITCHCOCK-SPENCER 1,743,913

BOILER FUR EVAPORATING QR HEATING LIQUIDS Filed March 27, 1929 5 Sheets-Sheet l av /WM Jaln. 14; 1930. A. L. HlTCHcocK-sPENcER 1,743,913

BOILER FOR EVAPORATING 0R HEATING LIQUIDS Filed March 27, 1929 v 5 Sheets-Sheet 2 Imam/70 Jan. 14, 1930. A. L. HiTCHCOCK-SPENCER 1,743,918

BOILER FOR EVAPORATING 0R HEATiNGLIQUIDS Filed March 27, 1929 S'Sheets-Sheet 3 Jan. 14, 1930. A. L. HITC HCOCK-SPENCER ,7

BOILER FOR EVAPORATING OR HEATINGLIQUIDS Filed-March 27, 1929 5 Sheets-Sheet 4 Jan. I4, 1930. 1 A. L. HITCHCOCK-SPENCER 1,743,918

I BOILER FOR EVAPORATING QR HEATING LIQUIDS I Filed March 27, 1929 5 Sheets-Sheet 5 I Z e efl""' Patented Jan. 14, 1930 UNITED PATENT OFFICE ARTHUR LINCOLNE' HiroH'oocK-sPnNcER, or AsiiwELL, NEAR BAL'DocK, ENGLAND namin Fort EvA ronA'rINe on HEATING LIQUIDS Application filed March-27g 1929, Serial No; 350,228, and in Great Britain March 23, 1928.

This invention'relates-toboilers tor evaporating or heating liquids having water-tubes in the fire-box but particularly to vertical boilers of this type in which such water-tubes are arranged inthe term of one or a plurality of nests of comparatively small diameter tubes extending across the fire-box andconimunicating at each end withthe' surrounding water space. i v u In practicethese tubes are so grouped as leavea sector-shaped passage relative to the curved wall of the fire-box which constitutes considerable dead space atueach vertical side of the fire-box and between adjacent nests of tubes up which the products of combustion can flow with the freedom necessary for the creation of an adequatedraught.

One ofthe primary objects of the present inventionis to obviate some'of the heat losses resulting from the presence of these dead spaces and preferably in such a manner as to render unnecessary the employment of an excessive member of closely grouped crosstubes.

Broadly the invention consists of a boiler ior evaporating or heatingliquids having one on more nests of water-tubes extending across the combustion chamber or fire-box in which a solid or hollow member oi r'efractory or i 30 other material is locatedin one ormore of the aforesaid normally deadi spaces and'disposed in slightly spaced relation from the iire-box wall to thus permit the products'of combustion to flow t'herethru, for the purpose 3 0i usefully absorbing heat from andot baffling the gases: which pass through such dead spaces.

By makingt'he members according to this invention hollow1 air steam or'other gases may it 40 be introduced'andbe thereby heated for any useful purpose such as primary and/or sec ondary air for supporting combustion in the same or one or more auxiliary boilers or for heating waste or live gases or air for use in as heating one or more auxiliary boilers or heaters or for drying and feed water" heating.

Where the hollow membersare to be used for heating air orother gas and wheresuch air orother gas is to be used-in supporting 5001" adding tocombustion'in the firebox of the same boiler the lower ends of the hollow members may be shaped to form nozzles or otherwise provided with outlets for causing the heated air or other gas to be projected into the fire-box.

For ease in assembly each member may be built up from a plurality of hollow sections and such sections may either communicate to form a continuous passage through the centre of the member or each section may form a separate and noncommunicating chamber.

The elements which are physically independent of the fire-box wall may be suspended in position from the fire-box crown by means of a central depending rod or tube which may conveniently extend through the fire-box crown, the water spaceand the opposite crown plate of the boiler. WVhere a tube is used for this'purpose such tube may be used for the admissioninto the interior of the element or each section thereof of the water air steam or other gas to be heated therein. Where air or'gas is to be introduced into each element and usedsubsequen'tly after heating as primary and/or'secondary air or burnt the same may be admitted to the interiors of the elements under pressure Orsuction such as by a suitable blower or exhauster.

Alternatively the interior of each element or the sections of each element may communicatewith the exterior of the boiler or heater by means of one ormore pipes extending laterally through the sides of the boiler or through the base or furnace or down the Lip-take.

As a further alternative the members accordingto this invention be constructed toform part of asuperheater for which purpose tlie" su aerheating tubes are arranged withinthe thickness of each member so that suclitubes will absorb some of the heat from such members. If desired these tubes may constitute the means or a part of the means for suspending the members'withi-n the firebox. Alternatively such tubes may constitute water tubes forthe purpose of assisting theevaporation or heating of the water.

Themembers according to this invention maybe either parallel or tapered in a vertical direction the thickest part of each member bein either at the top or at the bottom. By suita 1y shaping these members the velocity of the gases past the heating surface will be increased without unduly restricting the draught.

In order that the invention may be clearly understood and carried into effect several examples will now be described by aid of the accompanying drawings in which Fig. 1 is a vertical section through a vertical boiler in which the members according to this invention are solid and built up from shaped sectionsof refractory material supported from the fire-box crown by means of bolts.

Fig. 2 is a transverse section showing similar solid members but illustrating a modified method of supporting the same in position.

Fig. 3 is a view similar to Fig. 1 illustrating the use of hollow built up members supported by tubes which extend through the fire-box crown the water-space and the top flange of the boiler.

Fig. 4 is a transverse section through the same showing atop plan view of the members.

Fig. 5 is a vertical section through a boiler showing in elevation modified forms of hollow members adapted to be constructed of metal and used for the heating of steam or other gases to be used exteriorly of the boiler.

Referring now to Fig. 1 the members illustrated are composed of a plurality of solid shaped pieces a of refractory material which are threaded upon suitably long bolts 6 which are aflixed by their upper ends to the fire-box crown 0 so as to depend therefrom into the space between the fire-box sides at and the nests of water-tubes e.

In the modification illustrated in Fig. 2 the members composed of the sections a are supported in position by means of lateral bolts Such lateral bolts may however also be used in conjunction with the depending bolts Z) illustrated in Fig. 1 and serve the purpose of imparting lateral stability to the members.

The solid members in the examples just described serve the purpose of heat exchanging elements only heat being taken up from the ascending hot gases and imparted to the adjacent water-tubes e by radiation.

In the example illustrated in Figs. 3 and 4 the nests of tubes e are arranged in two vertical groups each group comprising three superimposed nests thus leaving three normally dead spaces for the free passage of the hot gases. In each of these spaces is arranged a member according to this invention and in the example illustrated these members, which are built up from refractory sections a are hollow and form a series of communicating spaces 9 throughout the length of each member. The hollow interiors of these members are adapted in the present example to be supplied withsteam, air or other gases which is introduced by way of pipes h serving also as a means for supporting the members in position. These pipes extend to the outside of the boiler through the fire-box crown c and by their outer extremities are connected to the required source of supply or left unconnected and open for the admission of air by natural draught. Such air may however be forced in under pressure by means of a blower or be induced in by suction.

Lateral lugs 11 are formed on the members to assist the same in maintaining their positions relatively to the water-tubes.

The lower end of each member is composed of a metal casting, forging or the like j having each an opening 74 so shaped as to project the heated air, gas or the like from the interiors of the members into the interior of the fire-box. In the case of a boiler heated by waste-heat some of the gases may be admitted from the lower end of the fire-box and the remainder by way of the inlet openings 70. This arrangement is also suitable for the admission of pre-heated primary and/or secondary air into the combustion chambers of coal or oil fired boilers.

In the modification illustrated in Fig. 5 the members, which are indicated at Z are each in one piece, hollow, and composed of metal. They are supported in position by means of lateral pipes on forming outlets for the air or other gases heated within the hollow interiors of the members. Suitable inlets, not shown, for such gases may also be provided. These members Z are primarily intended for use in heating air or gases for use exteriorly of the boiler but the same may of course be returned to the fire-box of the boiler for any suitable purpose. Such members may of course be composed of a number of sections and constructed of refractory material instead of metal.

As a further alternative the members according to this invention may be constructed to form part of a superheater for which purpose the superheating tubes are arranged within the thickness of each member so that such tubes will absorb some of the heat from such members. constitute the means or a part of the means for suspending the members within the firebox. Alternatively such tubes may constitute water-tubes for the purpose of assisting the evaporation or heating of the water.

Claims:

1. In a vertical flue boiler having a firebox substantially circular in cross section and a nest of water tubes extending transversely across said fire-box and defining in conjunction with the wall of said fire-box a vertical sector-shaped passage, a combined baffling and heat absorbing member disposed in said passage and spaced from said fire-box If desired these tubes may wall and having a connection with the firebox whereby it is supported therefrom;

2. In a vertical flue boiler having a firebox substantially circular in cross section and a nest of water tubes extending transversely across said fire-box and defining in conjunction with the wall of said fire-box a vertical sector-shaped passage, a combined bafliing and heat absorbing member disposed in said passage and spaced from said fire-box wall and having a connection with the fire-box whereby it is supported therefrom, said member being composed of a plurality of assembled sections.

3. In a vertical flue boiler having a firebox substantially circular in cross section and a nest of water tubes extending transversely across said fire-box and defining in conjunction with the wall of said fire-box a vertical sector-shaped passage, a combined baffling and heat absorbing member disposed in said passage having fluid connections whereby the absorbed heat is transmitted to said fluid.

4:. In a vertical flue boiler having a firebox substantially circular in cross section and a nest of water tubes extending transversely across said fire-box and defining in conjunction with the wall of said fire-box a vertical sector-shaped passage, a combined bafliing and heat absorbing member disposed in said passage in spaced relation to the firebox wall and having fluid connections whereby the absorbed heat is transmitted to said fluid.

5. In a vertical flue boiler having a firebox substantially circular in cross section and a nest of water tubes extending transversely across said fire-box and defining in conjunction with the wall of said fire-box a vertical sector-shaped passage, the combination of a combined bafliing and heat absorbing member disposed in said passage, means to deliver fluid to be heated to the hollow interior of the member, and means formed at the lower end of the member to deliver the heated fluid to the interior of the firebox.

In testimony whereof I affix my signature.

ARTHUR LINCOLNE HITCHCOCK-SPENCER.