US967718A - Water-tube steam-generator. - Google Patents

Description

A. G. BURKHARDT. WATER TUBE STEAM GENBRATDR.

APPLIUATION FILED JUNBQ, 1910. 1

Patenelug. 16, 1910.

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A. G.,BHRKHARDT. WATEBTUBE STEAM GENERATOR.

APPLICATION FILED JUNE 9, 1910.

Patented Aug. 16, 1910.

2 SHEETS-SHBET 2.

25 culating tubes.

AUGUST GOTTLOB BURKHARDT, F DUSSELDORF, GERMANY'.

WATER-TUBE STEAM-GENERATOR.

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` Specification of Letters Patent.` Patented Anil', 16, l1910.

Application led June 9, 1910. Serial 'No'. 566,084.

To ou wftom 'tt mail] concern:

B e it known that l, AUGUST Gor'rno BURKHARDT, engineer, a citizen of the Einvpire' of Germany, residing at Dusseldorf,

108. Gartenstrasse, have invented certain new and useful Improvements in or Relating to `Water-Tube Steam-Generators, of'4 which the following is a full, clear, and eX- act description. l

i My invention relates to `water-tube steam,

generators of the type wherein two horizontal Water drums disposed in the lower part of the generator are cross-connected by diagonally' arrangedl banks of generating tubes to upper steam and waterdrurns, cir

culating tubes also connecting each steam drum with the water drum directly below it.

According to my invention the heating gases are divided byA bullies into two currents which flow, separately through Veach bank of generating tubes and rejoin at the point where the banks of tubes cross one anlother, being then separated again to liow 'through the two groups of descending cir If desired, the heating rases then flow upward through tubular feed-water heaters which may also form the outer walls of the flue for the heating gases.

A construction of wateitube steam gencrater according to my invention is illustrated by way of example in the accom- `panying drawings, in which similar reference letters denote similar parts.

Figure l is a Vertical section on the line 1-1 of Fig. 2, Fig. 2 is a vertical section on the line 2-2 ot Fig. l, and Fig. 3 is a.

plan showing two different forms of feedwater-heater.

The generator illustrated is provided with both a fiat grate P of ordinary construe tion and also a stepped grate T so that the generator can be supplied with fuel simultaneously from both sides, steam coal being burned on the grate l? and soft or brown i5 coal on the stepped grate T.

The steam and water `drums A1, A2 arranged in the upper portion of the generator are cross-coimected to the lower water drums B1, B2 by banks of generating tubes o G1, C1, the two banks of tubes crossing one another in the manner shown. Since the generating tubes are exposed to the hottest gases, generation of steam takes place for the most part within the tubes. To return any water which may rise in the generating tubes C1, C2 in the shortest and easiest man- `to the arrangement of descending circulating tubes, water from one bank. of generat` ing tubes C1 is carried by the shortest route to the water drum B2 and thence into the vother groupof generating tubes C2 so that,

if the banks of generating tubes are heated to an unequal extent, the circulation of water is equalized. 4

The heating gases are compelled to flow in two oblique paths by means of baiiie plates J and K, the plates J extending downward from the point at which the banks of generating tubes erossfone another parallel to these tubes 'thus forming a roof which forces the heating gases to flow between and parallel to the generating tubes, the outer ones of 'which carry the baliie plates K and extend downward to the water drums B1, B2, the distance between the baffles K and J' being about equal to that of the width of each bank of tubes. The heating gases are thus divided into two currents which llow through the generating tubes and rejoin at the points Vwhere these tubes cross one another. Owing to the area of the passage through which the gases flow being considerably reduced by the crossing of the generating tubes, the heating gases make contact withthe walls of the tubes in a very thorough manner resulting in an eliicient generation of steam. After rejoining in the manner described, the two currents of heating gases again separate and flow down-- ward between the outer surfaces of the baille lates K and the inner-surfaces of the other battle plates L extending from the steam and water drums A1, A2 parallel to, and ter1ninating within a short distance of the lower ends of the circulating tubes D1, D1. Finally the heating gases 'How upward through two groups of tubes F containing feed-water whichflows downward in the opposite direction to the heating gases whfch` pass upward between these tubes and escape intor the main flue and chimney. .A l

The feed-waterheater- `tubes extend' from the end walls S of the generator to the superheatei 'ehiiiber M, `in this way covering the outer walls of the actual heating iuesof the generator as shown on the left hand side of Fig. 3. Alternatively, the feed Water de- Vice may be disposed soas to cover also the .outer wall of the superheater chamber F in which case verticalvpartitions Z are disposed between the feed-water tubes and lsuperheater 4chamber as shown lon the right hand side of F ig. 3. Owing to the feed-waterheater tubes being arranged on the outer side of the brickwork of the generator, these tubes are easily accessible for cleaning purposes and at the same time readily take up heat radiating from the inner lines.

As shown in Fig. 2 of the drawings, if desired, a superheater U may be disposed in an intermediate chamber and also in the chainbers bounded by the baiile plates K andL. The heating gases then enter through lateral openings V and escape at the top through openings W provided with regulating dainpers R.

What I- claim is 1. In a water-tube steam generator, the combination with steam and water drums arranged in the upper part of the generator, water-drums, arranged in the lower part of. the generator, banks of generating tubes crossing one another, lateral circulating tubes, both set of tubes connecting the upper and lower drums, and a furnace for generat- .ing heating gases, of bullies" dividing the heat-ing gases into two currents which rcjoin at the crossing point of said generating tubes, both set of tubes connecting the upper and lower drums, and a furnace for generating heating gases, of baies dividing lt-he heating gases into two currents which rejoin at the crossing point of said generating tubes and then separate again so as to flow down between the said circulating tubes, of baffles arranged near the outer surface of the circulating tubes and leading the heating gases, after having passed the circulating tubes, upward so as to sweep along feedwater-heater tubes forming the outer walls of the heating gas dues.

In testimony whereof I hereunto affix my signature in the presenceof two witnesses. AUGUST eo'rTLoB uiunnaii'i. [1.. a] Witnesses CHAs. J. VVnioH'r, O'r'ro KNIG.

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