US3198177A

US3198177A - Water tube boiler

Info

Publication number: US3198177A
Application number: US296837A
Authority: US
Inventors: Fujii Yuko
Original assignee: Maruzen Iron Works Ltd
Current assignee: Maruzen Iron Works Ltd
Priority date: 1963-07-22
Filing date: 1963-07-22
Publication date: 1965-08-03
Anticipated expiration: 1982-08-03

Description

Aug. 3, 1965 YUKO FUJI] 3,198,177

WATER TUBE BOILER Filed July 22, 1963 3 Sheets-Sheet 1 INVENTOR yuKo W LL BY WMMW -L p ATTORNEY s Aug. 3, 1965 YUKO FUJI! 3,193,177

WATER TUBE BOILER Filed July 22, 1963 5 Sheets-Sheet 2 Fi 3 7 K 51 M ;1 iii? if l7 I5 27 l4 l3 l4 5 22 INVENTOR yu. K0 F 1L3 Li.

BY u) M 43.1 @WZ/ fiw, ATTORNEY:

1965 YUKO FUJll 3,198,177

WATER TUBE BOILER Filed July 22, 1963 3 Sheets-Sheet 5 INVENTOR yuxo Fu u.

BY UDMM M phw ATTORNEY) United States Patent 3,198,177 WATER TUBE BOILER Yuko Fujii, Ichilrawashi, Japan, assiguor to Maruzen Iron Works, Limited, Tokyo, Japan, a limited-liability company of Japan Filed July 22, 1963, Ser. No. 296,837 2 Claims. (Cl. 122236) The present invention relates to water tube boilers, and particularly those of box shape.

The water tube boiler according to the invention essentially comprises a main body of box shape having a main combustion chamber and a convection chamber, said chambers being formed by partitioning with a vertical wall and communicating with each other at their rear ends, and said convection chamber being partitioned by vertical bafiles to form a zigzag combustion gas passage, a steam drum which is mounted on said main body at the top portion of said main combustion chamber, a water drum which is embedded in fire proof lining at the bottom portion of said main cumbustion chamber, said drums being connected by a number of water tubes, a burner port which is installed on the front Wall of said main combustion .chamber and located in a feed air chamber formed on the front side of said main body, and a number of vertical coiled water tubes which are installed within said convection chamber closely adjacent to each other and alternating with each other, and successively connected to form long pipe lines, each front end of said pipe lines being connected to said steam drum through a circulating pump and each rear end of said pipe lines being directly connected .to said steam drum.

The chief features and advantages are as follows:

(1) Said water tube boiler is very compact and elficient, since said boiler involves the main combustion chamber and the convection chamber within the main body of box shape, said chambers being adjacent and communicating with each other at their rear ends, and the combustion gas passing through said chambers is efficiently used to heat the water tubes.

(2) In the main combustion chamber of high temperature of the combustion gas having the steam drum and the water drum, which are connected by a number of the vertical water tubes, a natural circulation of water is carried out and said Water is favorably and sufficiently heated.

(3) In the convection chamber the temperature of the combustion gas is lower than in the combustion chamber, and in the long pipe lines composed of a number of the vertical coiled water tubes and in the zigzag combustion gas passage, a forced circulation of Water is carried out and said water is efiiiciently heated.

The other features and advantages will become apparent from a consideration of the following description.

In the accompanying drawings:

FIG. 1 is a front view partly in section, of a water tube V boiler according to the invention;

7 throughout the views.

Referring to FIGS. 1-4, 1 denotes a main body of box shape having a casing 2 provided with fire proof lining 3. Within said main body a main combustion chamber 4 and a convection chamber 5 are formed by partitioning with ice a vertical Wall 6, and said chambers communicate with each other at their rear ends as shown in FIG. 3.

At the top portion of the main combustion chamber 4 a steam drum 7 is mounted on the main body 1, and at the bottom portion of said chamber a water drum 8 is embedded in the lining 3. They are connected by a large number of vertical Water tubes 9, which are arranged in parallel along the surrounding walls except the front wall of the chamber 4, and by a number of vertical water tubes 9' which are embedded in the lining 3. Said front wall is conically shaped and provided with a burner port 10, which is located in a feed air chamber 11 formed on the front side of the main body 1. In said burner port the injection nozzle of an oil burner 12 is positioned.

The convection chamber 5 is partitioned by a plurality of baflles 13 which are alternately arranged upward and downward as shown in FIGS. 3 and 4, thereby forming a zigzag combustion gas passage. Installed within said chamber are a large number of vertical

rectangularlycoiled water tubes

14 and 14, which are arranged to be closely adjacent and to alternate with each other and successively connected to form two long pipe lines. Each front end of said pipe lines is connected to the outlet of a circulating pump 15 which is located in front of the main body 1 and driven by a motor 16, and each rear end of said pipe lines is directly connected to the steam drum 7, the inlet of said pump being connected to the bottom of said steam drum through a feed pipe 17.

Passing through each central part of the coiled water tubes 14 and 14 a motor-driven horizontal pipe 18 is rotatably mounted in the casing. Said pipe is provided with a number of small holes 19 along its length and is connected to a steam injector 20 which is secured to the back side of the main body 1. At the bottom of the convection chamber 5 a plurality of drains 21, each of which has an end cover 22, are installed.

Formed above the convection chamber 5 is an air preheating chamber 23 which communicates with the former at their front ends and .is provided with a large number of horizontal combustion gas pipes 24 supported by partition walls 25, the rear end of said air preheating chamber communicating with a chimney 26. Adjacent to said chamber and above the main combustion chamber 4 a horizontal air duct 27 is formed which communicates with the combustion gas pipes containing part of the chamber 23 between the partition walls 25, a plurality of vertical baffles 28 being mounted in the duct 27 and chamber 23 and forming a zigzag feed air passage as indicated by arrows 29 in FIG. 5.

The front and rear ends of said air duct communicate with the feed air chamber 11 and a vertical air duct 30, respectively, said vertical air duct being set up behind the main body 1 and connected to an air blower 31.

The water tube boiler according to the invention is thus constructed and its operation is as follows:

Water is fed to the steam drum 7, and the

vertical Water tubes

9 and 9 as well as the water drum 8 are filled with said water. After driving the circulating pump 15 by the motor 16, the oil burner 12 is ignited, thereby heating the main combustion chamber 4 up to high temperature of over 1,300" C. Then said water in the vertical water tubes 9 boils and goes up to the steam drum 7, where steam separates from the hot water, and comparatively cold water in said steam drum goes down to the water drum 8 through the vertical water tubes 9 embedded in the fire proof lining 3, thus a natural circulation of the Water being carried out and heating of the Water being conducted favorably and sufliciently.

The combustion gas produced in the main combustion chamber 4 flows from its rear end to the convection chamber 5 and flows in a zigzag path through it due to the vertical baffles 13 which are alternately arranged upward and downward, heating the long pipelines com,- posed of a large number 'ofthe coiled water tubes 14 and 14' efiiciently, although the gas temperature falls to about 9001,000 C. On the other hand, the water in said Water tubes boils and is forced to flow to the steam drum ,7, and comparatively coldwater in said steam drum is forcedto flow to'said Water tubes by the circulating pump 15.

The combustion'gas 'of 300 350 C. passing through the front end of the convection'charnber 5 goes up to the ,air preheating chamber 23. and passes through a large number of thejcombustion gas pipes 24 which are hori-,

zontally arranged within said chamber, heating surrounding air which isfed by the air blower 31 through the vertical air duct 30 and flows in a' zigzag path through thehorizontal airduct'27 as well asthe chamber 23 due to the baffles 28. ..Then'said air preheated economically is fed to the feed air chamber 11, the exhaust-combustion gas, which temperature falls to ZOO-250 C., escapes to the chimney 26 from the rear end of the air preheating chamber23. t V

When-the coiled water tubes 14 and 14' are coated with soot, the horizontal pipe 18 is revolved and steam .is fed to said pipe by the steam injector 20, then-said steam is emitted from a large numberof the small holes 19 in all directions, whereby said {soot adhered to said water tubes is blown oif, and the dirty water is discharged 'from the drains 21, thus therefficient heating of the waterv in saidcoiledwater tubes being steadily maintained.

Without further description it isjthought that the 'fea tures and advantages of the inventionwill be readily ap- ,parentto those-skilled 'in' the art, and it will of course be understood that changes in the form, proportionand -minor details of construction maybe resorted to, without departing from the spirit of theinvention or the scope of the appended claims.

What I claim is:

' .said steam drum, a substantially horizontal partition extending along the length of said housing and covering the top of said convection chamber, means forming an opening between said vertical partition and said housing at the end remote from said burner for admitting combustion gases into said -convectionfchamber, a plurality of-transverse horizontally spaced bafiies in said convection chamber, ,alternate- .baflies extending upwardly, from the horizontal partition'defin'ingan air preheating chamber,

bottom. of the convection chamber and theremainder extending downwardly from thethorizontal partition, said between itsel'fandthe topwall ofthe casing, aplurality of combustion gas pipes extending longitudinally of the casing through said air preheating chamber and having their one ends opening into said convection chamber adjac'ent the end of said casing with the burner therein and having the other ends opening out of' the casing at the i other ,end of the air preheating chamber, passage means between said' casing and one end of said air preheating v chamber for admitting combustion'air into the air preheating chamber, a duct openingout of the other end of said air preheating vchamber andextending to saidbur'ner,

and, bafilcs in said air preheating chamber for causing combustionair to travel 'a zigzagpath across said 'combustiongaspipes. r, a l

2. A water tube boiler construction as claimed in claim I v1 further comprising a horizontal piperotatably mounted in said casing "and extending through ,said convection -1 A water: tube boiler construction,:eomprising asublstantially' right rectangular prismatic housing, a vertical" partition within and; extending along the length of said housing and dividing the housing into a combustion chamber and aconvection chamber, a burner directed into one end of said combustion chamber substantially axially of the longitudinaldimension 10f the; chamber, a steam 'drum along the top of said combustion chamber and extending slightly into said combustion chamber and extending slightly out of the top surface of'said'housing, said combustion chamber having a fireproof lining, a water drum in said lining and extending along the bottom of said combustion chamber, boiler tubes extending from said water drum to said steam drum through said combustion chamber, further boiler tubes'extending from'said steam drum to said water drum through the lining in the side chamber and the centers of the coils of tubes therein, said pipe having a plurality of holes therein spaced along the length thereof, steam injector means coupled to said pipe, and pipe rotating means coupled to said pipe for rotating said pipe I 7 j References Cited the Examiner UNITED STATES-PATENTS 1,883,293 l1 0/32 Iacobus 122-235 1 2,350,202 5/44 Th0mas 165- 95 2,625,917 1/53 Barnes 122-250 2,704,534 3/55 Dalin et a1. L- ..122,'4.11X 2,865,342 12/58 Rehm '122-+406 PERCYQL. PATRICK, Primary Examiner. KENNETH w. SPRAGUE, Examiner.

Claims

1. A WATER TUBE BOILER CONSTRUCTIOON, COMPRISING A SUBSTANTIALLY RIGHT RECTANGULAR PRISMATIC HOUSING, A VERTICAL PARTITION WITHIN AN EXTENDING ALONG THE LENGTH OF SAID HOUSING AND DIVIDING THE HOUSING INTO A COMBUSTION CHAMBER AND A CONVECTION CHAMBER, A BURNER DIRECTED INTO ONE END OF SAID COMBUSTION CHAMBER SUBSTANTIALLY AXIALLY OF THE LONGITUDINAL DIMENSION OF THE CHAMBER, A STEAM DRUM ALONG THE TOP OF SAID COMBUSTION CHAMBER AND EXTENDING SLIGHTLY INTO SAID COMBUSTION CHAMBER AND EXTENDING SLIGHTLY OUT OF THE TOP SURFACE OF SAID HOUSING, SAID COMBUSTION CHAMBER HAVING A FIREPROOF LINING, A WATER DRUM IN SAID LINING AND EXTENDING ALONG THE BOTTOM OF SAID COMBUSTION CHAMBER, BOILER TUBES EXTENDING FROM SAID WATER DRUM TO SAID STEAM DRUM THROUGH SAID COMBUSTION CHAMBER, FURTHER BOILER TUBES EXTENDING FROM SAID STEAM DRUM TO SAID WATER DRUM THROUGH A LINING IN THE SIDE OF SAID COMBUSTION CHAMBER, A PLURALITY OF COILED TUBES IN SAID CONVECTION CHAMBER, EACH TUBE HAVING A PLURALITY OF SUBSTANTIALLY RECTANGULAR COILS WHICH LIE IN SUBSTANTILLY VERTICAL PLANES IN THE CONVENTION CHAMBER, THE ONE ENDS OF SAID COILED TUBES BEING CONNECTED TO ONE END OF SAID STEAM DRUM AND CIRCULATING PUMP MEANS TO WHICH THE OTHER ENDS OF SAID COIL TUBES ARE CONNECTED, SAID CIRCULATING PUMP MEANS BEING CONNECTED TO THE OTHER END OF SAID STEAM DRUM, A SUBSTANTIALY HORIZONTAL PARTITION EXTENDING ALONG THE LENGTH OF SAID HOUSING AND COVERING THE TOP OF SAID CONVECTION CHAMBER, MEANS FORMING AN OPENING BETWEEN SAID VERTICAL PARTITION AND SAID HOUSING AT THE END REMOTE FROM SAID BURNER FOR ADMITTING COMBUSTION GASES INTO SAID CONVECTION CHAMBER, A PLURALITY OF TRANSVERSE HORIZONTALLY SPACED BAFFLES IN SAID CONVECTION CHAMBER, ALTERNATE BAFFLES EXTENDING UPWARDLY FROM THE BOTTOM OF THE CONVECTION CHAMBER AND THE REMAINDER EXTENDING DOWNWARDLY FROM THE HORIZONTAL PORTITION, SAID HORIZONTAL PARTITION DEFINING AN AIR PREHEATING CHAMBER BETWEEN ITSELF AND THE TOP WALL OF THE CASING, A PLURALITY OF COMBUSTION GAS PIPES EXTENDING LONGITUDINALLY OF THE CASTING THROUGH SAID AIR PREHEATING CHAMBER AND HAVING THEIR ONE ENDS OPENING INTO SAID CONVECTION CHAMBER ADJACENT THE END OF SAID CASTING WITH THE BURNER THEREIN AND HAVING THE OTHER END OPENING OUT OF THE CASING AT THE OTHER END OF THE AIR PREHEATING CHAMBER, PASSAGE MEANS BETWEEN SAID CASING OF ONE END OF SAID AIR PREHEATING CHAMBER FOR ADMITTING COMBUSTION AIR INTO THE AIR PREHEATING CHAMBER, A DUCT OPENING OUT THE OTHER END OF SAID AIR PREHEATING CHAMBER AND EXTENDING TO SAID BURNER, AND BAFFLES IN SAID AIR PREHEATING CHAMBER FOR CAUSING COMBUSION AIR TO TRAVEL A ZIGZAG ACROSS SAID COMBUSTION GAS PIPES.