US2147574A - Steam generator - Google Patents

Description

Feb.. 14, 1939.4

F'il'ed Oct. 2l, 1956 A. E. DURAM STEAM GENERATOR 2 Sheets-Sheet l ATTORNEY.

Feb. 14,

A. E. DURAM STEAM GENERATOR Filed Oct. 2l, 1936 2 sheets-sheet 2 QQ@ Qi 7M@ ATTORNEY.

Patented Feb. 14, 1939 UNITED STATES PATENT OFFIEE STEAM GENERATOR Arthur E. Duram, Springfield, Ill., assignor to Springfield Boiler Company, Springfield, Ill., a corporation of Illinois .Application October 21, 1936, Serial No. 106,711 2 Claims. (Cl. 122-235) This invention relates to steam generators or Some of the upper tubes I4 which are conboilers and is particularly directed to apparatus nected to the rear header 'I extend toward the of this kind of large capacity and high rating. front of the boiler and then upwardly to form Heretofore such generators have frequently been a vertical wall or bank and then rearwardly to 5 supplied with auxiliary devices or attachments connect with the drum I2. The vertical por- 5; such as super-heaters, economizers or air heattions of these tubes are provided with insulation ers', which devices have been attached or posior blocks to form a partition I 5 that extends tioned in various relationships with the steam from approximately the top of the main bank of producing elements or boiler settings. The tubes 8 to a point somewhat below the tubes I3,

1z0-.present invention contemplates a steam genthus providing a passageway I6 at the Vfront of 10 erator having such devices arranged substantially the boiler setting as clearly shown in Figure 1. within the confines of the boiler setting in order Another group of tubes I'I extend from the to overcome objectionable features of suchprerear header l to a point slightly back of the vious apparatus and to provide an improved boil vertical bank of tubes I4 and then upwardly, 1 51 er which will be comparatively simple in conand are connected with the drum I2 the same as 15' struction and particularly efficient in operation. the tubes It. The tubes I 'I are also provided Other objects are to provide a steam generator with insulation, blocks or the like, to form a having a novel arrangement of auxiliary attachpartition or wall I8 which is parallel to the wall ments such as super-heaters, economizers and l5 and these two water cooled partition walls 20. air heaters, and means to control the gases passdefine a. vertical by-pass I 9 to by-pass gases from 20 ing through such devices; to provide an improved the passageway Iii. The flow of gases through steam generator or boiler of high capacity, high the by-pass may be controlled in any suitable pressure, and relatively high temperature with manner as by means of a damper 2li which may means for controlling the gases to the superbe provided with any suitable controlled or opg5` heater and other parts; to'provide a boiler haverating means. The upper row of tubes ZI from 25 ing auxiliary equipment comprising a superthe rear header l' also extend for a short dis heater, economizer and air heater arranged in tance parallel to the tubes of the main bank and series in the gas flow above the tube bank of the then upwardly and then rearwardly and are conboiler and below the steam and Water drum, and nected to the drum I2 to form down-comers ,ad within the reasonable coniines of the boiler setfrom the drum to the headers. 'I'he vertical por- 30- ting; to provide a boiler of the character indition or bank of tubes 2l is also provided with cated having a novel arrangement of tubes; to insulation blocks or the like to form a partition provide a by-pass and other connections; and in 22 which terminates at a short distance from general to provide such improvements and dethe top bank of the tubes 8 but extends upwardly gfx sirable features as will be described more fully to the tubes 63 or to the top of the boiler setting 35.

hereinafter. and thus provides a passageway 23 which is sub- In the accompanying drawings illustrating stantially parallel to the passage I6. A baie this invention, or wall iii is positioned above the tubes 8 and Figure 1 is a longitudinal sectional View with extends from the header 'l or rear of the boiler m parts shown diagrammatically or omitted for setting to the wall I8 so as to direct the gases in convenience in illustration; and to the passageway I6 and by-pass I 9.

Figure 2 is a similar View showing a modified It will be noted that the partition 22 is located form with the drum in a different position and at a sufficient distance from the back of the boiler 4other parts arranged accordingly. setting to provide a third passageway 25 which 45 The main boiler 5 includes afront header 6 and is provided with a gas outlet 26. This arrange- 45 rear header I connected by a bank of tubes 8 ment is such that the gases oi combustion pass and adapted to be supplied with heat from a up through the passageway I6 when the by-pass furnace s which may be supplied with any suitis closed, then over the top of the by-pass and able combustion apparatus (not shown) such as down through the passageway 23, then under the 50 used for boilers of this type. The header 6 is wall 22 up through the passageway 25 and out 50 connected to a header Ill by means of vertical through the outlet 26. When the damper 20 is tubes ii and the header I0 is connected to the opened a portion of the gases will pass through boiler drum I2 by horizontal tubes I3 which pass the by-pass and thus reduce the amount of gases along the top of the boiler, the drum I2 being or heat supplied to the chamber or passageway 55 positioned substantially over the header 'I. 55

A super-heater 21 of any suitable type is positioned within the chamber or passageway I6 and is connected to the drum l2 by tubes 28 and is provided with an outlet pipe 29 for connecting the same with an engine or other apparatus to be supplied with steam.

An economizer 30 of any ordinary or preferred form is positioned within the chamber or passageway 23 and provides means for heating the feed water by the' waste gas. The economizer has an inlet or supply pipe 3| which is connected with a boiler feed pump or the like (not shown) and has an outlet pipe or connection 32 to the drum I2. An air heater 33 is positioned within the chamber or passageway 25 and is supplied with heating gas which passes from the passageway 23 under the partition 22 and up through the heater before it escapes through the outlet 26. The air heater may be of the plate type such as indicated, or of any other suitable type and is shown as having an air inlet 34 which may be supplied with air from a forced draft fan. The outlet 35 is connected in any suitable manner to supply air to the furnace or fuel burning equipment. It will be understood that the drawings are intended generally to represent the upper section of a standard boiler and that the same is supplied with such additional connections or controlling devices as commonly used for such apparatus.

In generating apparatus of tlus type it has been found particularly desirable to provide means for controlling the amount of gas or heat supplied to the super heater. In accordance with this invention, if the damper or control device 2) is closed, all of the gases from the furnace pass up through the main boiler tubes and then through the passageway IS, then down through the passageway 23 and the economizer 30 and then up through the passageway 25 and the air heater 33 and out through the outlet 26. If it is desired to reduce the amount of heat supplied to the super heater the damper 20 is opened any desired amount which permits a portion of the gases of consumption to be by-passed through the by-pass I9, thus reducing the amount supplied to the super heater, but in either event all of the gases continue through the economizer and air heater as described. The provision of the water cooled walls on either side of the by-pass prevents the burning out of these walls and at the same time the heat from the gases will be utilized to heat the water or steam in the bank of tubes I5 and Il', thus tending to utilize the heat as well as to increase the circulation in the boiler.

The modified form of construction shown in Figure 2 is substantially the same as above described but shows a slightly different arrangement which might be found advantageous in certain installations. In this construction the drum I2a is moved forward and the down-comer tubes Zia extend directly down from the bottom of the drum instead of being bent to connect therewith as shown in Figure 1. The gas outlet 26a is then extended up at the rear of the drum, as shown. The operation is substantially the same as described in the apparatus shown in Figure 1. In both forms it is of course understood that the boiler setting is suitably arranged in substantially the usual manner in order to properly enclose the various elements. It will also be noted that the present invention is directed to the general construction andy arrangement of the steam generator as a whole and to the positioning of the several units or auxiliary devices rather than to the specific construction of any of such devices. It will also be noted that changes may be made in the arrangement of the parts and in some instances one or more of the auxiliary features may be omitted without departing from the scope of this invention so that the invention should not be limited to the particular arrangement herein shown and described except as specied in the following claims in which I claim:

l. A tubulous boiler of the character set forth, inclu-ding a rear header and a drum, having some of the upper tubes extending forwardly from the rear header 'and then upwardly to provide parallel banks with a space between the same, the upper ends of the tubes being connected with the drum, a baffle from the rear header to the rear bank of said vertical tubes, partitions secured to the tube banks to provide a by-pass around the front gas passageway, a damper for controlling the by-pass, down-comer tubes extending from the rear header upwardly to provide a parallel bank spaced from the by-pass and connected with the drum, a partition secured to the down-comer tubes and extending upwardly to the top of the boiler and terminating above the baiile, said partitions being arranged to provide three passageways in series at the top of the boiler, the last passageway being provided with an outlet, and auxiliary apparatus positioned in said passageways.

2. The combination with a boiler having front and rear headers connected by a main bank of tubes and having a drum positioned above the rear header and all enclosed in a setting, of downcomer tubes from the drum to the rear headers forming a vertical bank, riser tubes from the rear header extending upwardly in front of the downcomer tubes and arranged to provide parallel banks adjacent to each other, partitions connected with said banks, and bales associated therewith to divide the upper part of the boiler setting into three main passageways for series flow of the gases, and a by-pass around the front passageway, means for controlling the flow through said by-pass, a super heater positioned in the front passageway, an economizer positioned within the intermediate passageway, and an air heater positioned within the last passageway.

ARTHUR E. DURAM.

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