US1795383A

US1795383A - Boiler furnace

Info

Publication number: US1795383A
Application number: US97551A
Authority: US
Inventors: John Van Brunt
Original assignee: Int Comb Eng Corp
Current assignee: International Combustion Engineering Corp
Priority date: 1926-03-26
Filing date: 1926-03-26
Publication date: 1931-03-10
Anticipated expiration: 1948-03-10

Description

March 10, 1931. VAN BRUNT 1,795,383

BOiLER FURNACE Filed March 26, 1926 2 Sheets-Sheet 1 IN VEN TOR ATTQRNEY5 I Malth 10, 1931. VAN BUNT 1,795,383

BOILER FURNACE Filed March 26 5 2 Sheets-Sheet 2 IN VEN TOR A TTORNEYS Patented Mar. 10, 1931 J'OHN VAN BRUNEI, OF FLUSHING,

BUSTION ENGINEERING CORRORATION, OF NEW YORK,

DELAWARE The invention relates to boiler furnaces and is especially useful where the fuel to be burned is in finely divided form such as pulverized fuel.

One of the primary objects of the invention is to greatly increase the capacity of a boiler of the cross drum type without materially increasing the size of the installation.

By my invention I propose by an improved l0 novel arrangement of a cross drum boiler and a combustion chamber therefor to convert an ordinary cross drum boiler installation into a high capacity boiler installation, or construct a new installation from parts heretofore used in constructing the standard forms of boilers of this class. 1

The invention is particularly useful, although not necessarily restricted to, the converting of sectional header substantially horizontal water tube boilers in connection with which it will be described.

Other objects and advantages of my invention will be set forth hereinafter as they will be more readily understood in connection with the description of the invention.

How the foregoing, together with such other objects as may be incident to my invention, are realized is illustrated in preferred form in the accompanying drawings,

wherein- Fig. 1 is a vertical section throu h a boiler furnace embodying the preferre form of my invention;

Fig. 2 is a the line 2-2 of Fig. 1;

Fig. 3 is a modified form of downcoiner connection between the cross drum and the lower drum of the tubular rear wall of the combustion chamber;

Fig. 4 shows a modified arrangement of the offtake; and

Fig. 5 is a cross section through several of the finned tubes which I employ to form the walls of the combustion chamber.

Referring nowto the drawings and parfragmentary section taken on NEW YORK, ASSIGNOR TO INTERNATIONAL GOI- N'. Y., A CORPORATION 0] 301mm summer:

Application filed March 26, 1928. Serial No. 97,!51. I j ticularly to Fig. 1, it will be seen that I provide a combustion chamber A the walls of which 'are largely defined by water tubes,

beneath a boiler B of the cross drum type. a

The boiler B comprises in general the cross drum 5; the bank of'tubes 6, each vertical row of which is connected into a rear header 7 and a front header 8 said headersbein'g of any standard form, either straight or smuous; tubes 9, of the section of tubes C, connected between the drum 5 and the front headers 8; and finned downcomer tubeslO connecting the drum with the rear headers 71 In addition to the tubes 9 the section oftubes C includes tubes 10 connecting'the drum 5 with the front header 11 into which header the upper headers of the tubular side walls of the combustion chamber connect as will presently appear. 'A superheater D is located between the bank of-tubes 6 and the section of tubes C.

It is to be noted thatalternate headers of the front headers 8'extend above the adjacent ones whereby spaces are provided therebetween for the tubes 10 which extend from the drum 5 to the cross header 11.

The combustion chamber A comprises a front and rear tubular water wall E and F respectively, side tubular water walls G only one of which is shown in the drawings the other one being of the same construction, and toprplnd bottom screens H and I respectively. e rear wall F is formed of finned tubes 12 connected at their upper ends into the upper cross header 13 located adjacent the rear headers 7 of the bank of tubes 6 and at their lower ends into the lower drum 14. The front wall E is formed of finned tubes 15 one for each of the headers 8 of the bank of tubes 6 into which headers 8 they are connected at their upper ends. The tubes 15 connect at their lower ends into the cross header 16. The side walls G are formed of finned tubes 17 connected at their upper ends into the upper cross headers 18 located opposite the cross respectively are formed of spaced

tubes

20 and 21, the tubes 20 of the upper screen connecting the upper header 13 of the rear wall with the front headers 8 of the bank of tubes and the tubes 21 of the lower screen connecting the

lower headers

16 and 14 of the front and rear walls respectively. p

A downcomer pipe 22 connects the cross drum 5 with the lower drum 14 of the front wall E by virtue of which and by the interconnection of the tubes of the end walls and the tubes of the top and bottom screensthe circulation will be downward from the drum 5 to the drum 14 and upward thru the

tubes

12 and 20 to the headers 8 and also upward thru the

tubes

21 and 15 to the headers 8. In the arrangement shown in Fig. 1 it is preferable to provide one of the downcomer pipes at each end of the drum 5 and the drum 14. In Fig. 3 I have shown a modified form of downcomer connection in which a plurality of small diameter pipes 22a 'are employed. The circulation of the cross drum boiler B is from the rear headers 7 to the front headers 8 by virtue of the downcomer connections 10 from which it will be seen that the circulation of both the boiler and the above mentioned tubular screens is toward the front headers 8 of the boiler B. The circulation thru the tubes of the section C is from the front headers 8 and 11 to the cross drum 5.

In connection with the side walls G it is pointed out that the lower headers thereof are connected into the lower drum 14 of the tion air is supplied around the burners 23 from an air heater (not shown) located in the stack or ofi'take 24 which ofitake is shown in Fig. 1 as being located above the boiler B and above the economizer section C. A conduit 25 is led from the air heater to the casin 26 thru the medium of which the air-is supp ied around the burners; The preheated combustion air increases the furnace temperature head, and since the combustion chamber is defined by water tubes exposed to radiant heat there is a very rapid transfer of heat.

The products of combustion are drawn thru the top screen H and the bank of tubes 6,

thence thru the su erheater, thence thru the integral section and finally thru the air preheater in the stack or olftake. Thus it will be seen that these parts are subjected to the hot gases, the top screen H however being exposed to radiant heat.

In Fig. 4 I have shown a modification in which the ofi'take 24ais located directly beneath the cross drum 5.

From the foregoing it will be apparent that I am enabled to greatly increase the capacity of a cross drum boiler installation by converting it into a boiler furnace, and this for introducing fuel and air under conditions to produce violentand intense combustion, an ofitake above said bank of tubes for drawing off the products of'combustion; said combustion chamber including side walls formed of water tubes and headers at each end into which they are connected, a front wall formed of upright water tubes and a header at their lower ends into which they are connected and being connected at their upper ends to the front headers of aforesaid bank of tubes, a rear wall formed of upright water tubes and a drum at their lower ends and a header at their upper ends into which they are con.- nected, s aced tubes marginal of the top of said combustion chamber connecting the upper header of the rear wall tubes to the front headers of the bank of tubes and spaced tubes marginal of the bottom of said combustion chamber connecting the lower header of the front wall tubes with the lower drum of the rear wall tubes; a downcomer connection between the drum of the cross drum boiler and the lower drum of the rear wall; an upcomer connection between the headers at one end of the side wall tubes and the drum; and means for connecting the headers at the other end of the side wall tubes to the lower drum of the rear wall tubes.

2. A boiler'furnace comprising in combination a boiler of the cross drum type having a bank of substantially horizontal' tubes each vertical row of which is connected into a front and rearheader, a combustion chamber therebelow largely defined by tubular water walls comprising a front wall formed of finned tubes and a header below the aforesaid front headers said tubes connecting said lower troducin and rear header,

header and said front headers, a rear wall formed of finned tubes, an upper cross header therefor adjacent the aforesaid rear headers, and a lower cross drum therefor, side walls formed of finned tubes, upper cross headers therefor opposite the cross drum boiler and lower cross headers therefor, and a bottom screen of spaced tubes connecting the lower header of the front wall with the ower drum of the rear wall, means connecting the upper header of the rear wall with the front headers of the cross drum boiler, a downcomer connection from the cross drum boiler to said lower drum and an upcomer connection from the upper headers of the side walls to the boiler, the lower headers of the side walls being connected with said drum, and means for mfuel to be burned in suspension in said com ustion chamber.

3. The combination cross drum type havin the usual drum and a bank of substantially orizontal tubes, each vertical row of which is connected into a front alternate headers of said front headers extending upwardly beyond the ad 'acent ones, water tubes connecting the cross rum with said front headers, a water wall, a cross header, said water wall being connected to said cross header, and water tubes :onnectin the cross drum with the cross header said tu s passing thru the spaces between said alternate upwardl extending headers above said adjacent hea era.

4. A boiler furnace comprisingyin combination, a boiler of the cross drum type having the usual drum and a bank of substantially horizontal tubes and their headers, a com-' bustion chamber beneath said cross drum boiler, said combustion chamber including end tubular water walls and spaced water tubes marginal of the top and bottom thereof, header means for connecting the bottom tubes with the tubes of the end Water walls, header means for connecting the top tubes at one end with the tubes of one end wall, said top tubes being atvtheir other ends connected to the cross drum boiler, and means for introducing fuel to be burned in suspension in said combustion chamber.

5. A boiler furnace comprising, in combination, a boiler of the cross drum type having the usual drum and a bank of substantial-1 ly horizontal tubes and their headers, a combustion chamber beneath said cross drum boiler, said combustion chamber including side and end tubular water walls and spaced water tubes marginal of the top andbottom thereof, header means for connecting the bottom tubes with the tubes of the end water walls, header means for connecting the top tubes at one end with the tubes of one end Wall, said top tubes at their other ends being connected to the cross drum boiler and the tubes of the other end wall being connected to the cross drum boiler, header means into which the with a boiler of the d in name. slgne y JOHN VAN BRUNT.

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