US1621505A - Steam generator - Google Patents

Description

March 22 ,1927. 1,621,505

O. H. HARTMANN ETAL STEAM GENERATOR Filed March 23, 1925 2 Sheets-Sheet 1 ATTORNEYS March 22, 1927. 1,621,505

0. H. HARTMANN ET A1,.

STEAM GENERATOR Filed'March 23,-1925 2 Sheets-Sheet 2 AZ W ATTORNEYS Patented Mar. 22, 1 927.

. UNITED STATES PATENTYOFFICE.

OTTO H. H AR'IMANN-AND ALFRED HERMANUZ, F CAESEL-WILHELHSEOHE, GER- MANY, ASSIGNORS TO SGHMIDTSCHE HEISSDAMPF-GESELLSCHAFT I. B. H., 01'

.CASSEL-WILHELMSHOHE, GERMANY.

STEAM GENERATOR.

Application riled March 23, 1925, Serial 1T0. 17,609,and in Gerniany March 26, 1924.

Our invention relates to generators of steam and particularly to water tube boilers in which the steam is generated partly by direct heating or directly and partly by in- 5 direct heating or indirectly, that is to say,

by means of a heating medium or a heat carrier circulating in a closed circuit. According to our invention the heat-receiving portion of the tube system for the heating medium is arranged in the furnace so that parts of the boiler, such as the brickwork, or the steamand water drum, are protected against excessive heat bythe said portion of the tube system forming a protective screen for these parts.

The arrangement of a steam generator according to our present invention is of special importance in connection with boilers working atvery high temperatures, for example,

those fired with pulverized coal which have recently been largely employed in steam' power installations. A further advantage consists in the fact that the heating surface of the boiler can be increased by providing additional surfaces in those parts of the furnace hitherto'unutilized. If the tube system for the heating medium, with the object of forming several independent circuits, consists of a number ofindividual elements, it is of special advantage to construct each element so that that part of it lying outside the water-space of the boiler can be readily detached from the remaining part.

In the accompanying drawings Fig. 1 is a longitudinal section through the upper part of a water-tube boiler,.

Fig. 2 being a cross-section on the line 22 of Fig. 1,

Fig. 3 a longitudinal section on the line 3-3 of Fig. 1, and

Fig. 4 a cross-section Fig. 5 shows a second form of the invention.

According to the form shown in Figs. 1 to 4,- the upper steam-and-water drum, a, of the boiler has expanded thereinto the usual water-tubes, b. In the water space of this on the line of drum, a, a series of tube elements, a, are

arranged which are connected by unions, e, or other suitable means with tubes, d, lying between adjacent longitudinal series of water-tubes, b, in the neighbourhood of the points of attachment of these tubes to the drum, the arrangement being such that each of the tubes, 0, d, forms a circuit closed in itself, while in addition each tube, d, can be detached. from the corresponding tube, a, and withdrawn from between the watertubes,.b. Each of the tubes 0, d, contains a heat-carrier, for example, water or the like which is heated in the parts, d, by the hot gases rising from the furnace or by the radiant heat of the latter, the water or the like so heated rising to the upper tube, 0, and there giving up its heat to the surrounding water. In this manner the direct heating of the drum, 0, by the hot ases, is assisted in an eflicient manner by t e indirect heating due to the heat-carrier. The lower length 70 of each tube, 0, possesses sufiicient fall to ensure flow of condensed heat-carrier to the lower tubes, (Z. The tubes, (1, are so arranged that they more or less fill'the spaces between adjacent longitudinal series of water-tubes, 6, thereby protecting the lower part of the drum, a, into which the upperends of the water-tubes are expanded, against the direct action of the hot gases or the radiant heat of the furnace.

In the illustrative form of the invention described, the protective wall for the drum, a, is formed by the lengths of tube, d, extending only in a longitudinal direction between the water-tubes b.

As an alternative, the heat-receiving part of the tube system containing the heat-carrier can also be arranged in some other position' in the furnace, for example, on a wall thereof. Such an arrangement is shown in 90 Fig. 5, in which the heat-receiving surface, d, of the heat-carrier is arranged not only below the upper drum, a, but. also in juxtaposition to that surface of the brickwork, f, disposed towards the furnace. 95

The arrangement and structure of the elements, a, d, is the same as above described with reference to Figs. 1 to 4. v

The forms of the invention illustrated are applicable to stationary water-tubebozlers. The invention, however, is not restricted to such anapplication but can be applied with be made without departing from the spirit of our invention as defined in the appended claims.

What we claim is:

L In a steam generator, means including a steam and water container and a plurality of water tubes connected therewith; for generating part of the steam directly, a tube system for generating the other part of the steam indirectly, the heat-receiving portion of said tube system being located as a protective screen in front of parts of said container xposedto extreme heat.

2. In a steam generator, a furnace a steamand-water container having a wall thereof facing said furnace, water-tubes communieating with said container and being connected with it on the side facing said fur'- nace,-a tube system containing a heating medium for indirectly generating part of the steam, a portion of said tube system being located inside said container, another portion of it being located outside the conajplurality of water tubes connected therewith for generating part of thesteam directly, a tube system containing a heating medium for transferring the heat of the furnace lndirectly to the water of the container, said tube system consisting of tubes forming a closed circuit for the heating medium and a protective screen for parts of the container exposed to extreme heat.

4. A steam generator as claimed in claim 3, in which the tube system for the heating medium consists of a number of individual elements, each being a circuit closed in itself.

5. A steam generator as claimed in claim 3, in whichthe tube system for the heating medium consists of a number of individual elements, the parts of these elements lying outside the water container being detach-v tective screen for the wall of said container- Where the ends of the water-tubes are expanded into said wall.

7. A steam generator as set forth in claim 3 in which the tube system for the heating medium consists of a number of individual elements, each forming a closed circuit, in itself and having a detachable connection between the part arranged inside and the part arranged outside of said container.

8. A steam generator as set forth in claim 2 in which the tube system for the heating medium cons sts of a number of individual elements, each forming a closed circuit in itself and having a detachable connection between that part of each element arranged in said container and the part arranged outside thereof, said detachable connections being located outside of the furnace walls.

OTTO H. HARTMANN. ALFRED HERMANUZ.

Images