US1777674A

US1777674A - Water-tube boiler

Info

Publication number: US1777674A
Application number: US390520A
Authority: US
Inventors: Kingsley L Martin
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-09-05
Filing date: 1929-09-05
Publication date: 1930-10-07
Anticipated expiration: 1947-10-07

Description

g Patented Oct. 7, 193()Y UNITED STATES xINesLEY nfiviAn'rINgoF Moiv'rciinin, NnwJnnsEy i WATER-TUBE BOILEB application sied september 5, i929. sprai Np. 390,520.

This invention relates to water tube boiler construction and particularly to bailie walls as used in vertical boilers. The invention has for its primary object the provision oan 5 interrupted baffle wall (1) which will iinprove the eiiiciency and increase the capacity` of the boiler by securing the best distribution of the gases of combustion over theheating surface of the boiler, and (2) which will pro-` `io videa means of readily modifying a baille installation to suit the working conditions of the boiler as developed in operation. The invention is used to best advantage in `vertical boilers having cross baiiies'built inaccordance'with Patent No. 1,702,933 issued to Alfred C. Danks and Kingsley L. Martin. Certain embodiments of the inventionfare illustrated in the accompanying drawings, wherein:

` Figure 1 is a vertical` section through a vertical water tube boiler Vshowing the location of the interrupted baille walls to which the invention is applicable. Fig. 2 is a detail cross section through the interrupted baffle and the first bank of tubes in which it iscustoinarily located as on the line II-II of Fig.

1. Fig. 3 is a detail eleva-tion of rone bank of tubes showing an alternate method ofhconstructing the interrupted baiile with horizontalinstead overtical open spaces.

By way of illustration, the baiiies are shown as applied to a Stirling boiler, but it will be understood that the invention is applicable to the other types of vertical boilers i and that the claims are applicable to all types unless otherwise limited by their terms.I

The boiler shown comprises the setting 1, l rebox 2, the three banks of tubes 3, 4 and 5, the drums 6, 7, 8, and 9, the front balile coni- 10 prising the sections 10 and lland'the rear battle comprising the sections 12 rand 13, the sections 1() and 12 extending longitudinally of the tubes and the sections 11 and 13 extending transversely of the tubes. 'lhe interrupted baffle 14 also extends lengthwise .of the tubes in an upward direction from the cross baille wall 11 and may be located either on the first bank 3, as shown 'in Fig. 3, orbetw-een the tubes as shown in Fig. 2.

Fig. 2 showsthe construction of the interi rupted baiiie withlongitudinallspaces asfit f 1 y.

extends longitudinally of the tubes above the upper cross baille 11. As shown in this fig-1 ure, the.alternatespaces A and B between the tubes are made` widean-d narrow, respec` tively, ,in accordance"with` the` regular prac tice;` the `wide spaces being designed to give `room `forthe removal of v tubes when it bei comes necessary to take -themoutA for `re `soll Fig.; 3, shows the` interruptedbaiile constructed. with horizontal .spaces 16, the preferredginethod beingl touse horizontal angles 17 clamped to `a row offtubes and supporting molded refractory p blocks `18. The distance` p between the angles'and the width `of the B0 blocks `maybe designed originally to meet expected conditions and later changed withf out :undueexpense if found desirable;4 c The Vadvantages of the interruptedbaie will be readily apparent to thoseskilled in s" the art. With` certain boilers4 having `superheaters` similarto 19 vof unusual length,.itis j i necessary to locate the cross baile 11 low j down on the tube banks 33.and,4.to avoid curtai'ling the superheater area. In such cases, the gases do notv iood the upper end of tube bank 3,but may follow the cross baffle 11 and render the valuable heating surface at the upper end of the tube bank 3 ineffective.

A marked improvement in boiler operation is d obtained by the use of an interrupted baftle, assliown, which permits part of the gas to pass through the open spaces to the lower end of' the superheater and to that part of the second tube bank 4 immediately above cross PATENTgoFFicE* 4 v ient length itting back `to `back between the' U5 baiiie 11, but forces the remainder of the gas to the upper end of the first bank of tubes 3, the upper end of superheater 19 and the upper end of the second bank of tubes 4.

The distribution of the gas more evenly over the superheater instead of permitting heat concentration on its lower end, is also a marked advantage in securing higher superheat and'longer life of the superheater elements. It has been found in practice that the momentary draft restriction is not suiiicient to be objectionable, while the decrease in temperature of the gases leaving the boiler is materially lower, eiiecting a very substantial saving in fuel. I

lVhat I claim is:

1. In combination in a vertical water tube boiler, comprising a plurality of steam and water drums, a mud-drum and a plurality of banks of tubes connected between said steam' and water drums and said mud-drum, a superheater located between the first and second banks of tubes and a baH'le wall built in part longitudinally of the lower portions of the tubes of the first bank and in part transverse of the said tubes and an extension of the longitudinal baiiie extending part way to the upper drum and in front of a portion of said superheater and comprising a plurality of spaced portions to provide openings therebetween whereby some of the gases pass through said openings and all of the furnace gases are distributed more evenly over the elements of the superheater.

2. In combination in a water tube boiler of the vertical type having Vupper drums and a lower drum, and a plurality of banks of tubes extending between the upper drums and the lower drum, a bailie wall having a section of imperforate construction extending upward from' the lower drum longitudinally of the tubes of the irst bank and a section eX- tending transversely of such tubes, a super heater located between the iirst and secondV banks above the second section of baile, and an extension of the baiiie also extending upward longitudinally of the tubes part way to the upper drum and in front of a portion of such superheater and comprising a plurality of spaced portions to provide openings therebetween.

In testimony whereof, I have hereunto subscribed my name this 28th day of August,

KINGSLEY L. MARTIN.