US1851842A

US1851842A - Water tube boiler

Info

Publication number: US1851842A
Application number: US382148A
Authority: US
Inventors: Huster Alfred
Original assignee: Fried Krupp Germaniawerft AG
Current assignee: Fried Krupp Germaniawerft AG
Priority date: 1928-08-03
Filing date: 1929-07-30
Publication date: 1932-03-29
Anticipated expiration: 1949-03-29

Description

March 29, 1932. A. 'HUSTER 1,851,842

WATER TUBE BOILER Filed Jul so, 1929 passage Patented Mar. 2 9, 1932 UNITED STATES PATENT OFFICE.

ALFRED HUSTER, OF KIEL, GERMANY, ASSIGNOB '10 FRIED. K RUPP GEBMANIAWERIT AKTIENGESELLSCHAFT, OF KIEL-GAARDEN, GERMANY l WATER TUBE BOILER The invention relates to water tube boilers and more particularly has reference to a tight tube wall intended for boilers of this class and composed of a plurality of rows of tubes. As well-known, tight tube walls of this type are formed from two or more rows of tubes by bending these tubes on a portion of their length into a common plane. When a or the combustion gases is provided at the end ofthe tight tube wall, the latter is resolved again'on a corresponding portion so as to form anew the original rows of tubes. Owing to the tight wall subsidin into these spaced rows of tubes at acute ang es and due to the small pitch of these rows, deposit of flue dust-fin front of the passage for the combustion gases is favored. This passage therefore will easily become choked up by deposits of flue dust and clinker to such an extent of the original two rows that start out from.

that interruption of service occurs. This I already become solid and therefore is no longer able to stick. By a comparison of Figs. 2 and 4, it is seen that the row H is composed of the tubes of original row C,

drawback is avoided by the invention.

To. this end the invention consists in the fact that the tight tube wall which is formed by assembling two or more rows of tubes, in the range of the passage for the combustion gases is resolved into a number of rows of spaced tubes which is at least by one row greater than the rows the wall is ori ally composed of, at least the two first 0 these a spaced rows having a larger pitch than the original rows. The tubes forming the original solid wall are separated unequally.' One fourth of the tubes are bent to form the outermost row, one fourth to form the second row and one half to formthe third row, each row. behind'the other. Thus the pitch or distance between the tubes of the first two rows is greater than that between the tubes of each A the upper drum. Where protective tubes are. 1

provl e which project beyond the tight tube wall, they are arranged accordin to the inventlon so as to be situated each in front of the individual tubes of the first row of the spaced tubes formin the passage.

In orderthat the invention can .be more readily understood, an'embodiment of the 882,148, and in Germany August 8, 1928.

water tube boiler designed according to the invention, and

Figures 2 to 4 are horizontal sections, seen from the top, on the lines 2-2, 33, 4-4,

' respectively, of Figure 1.

Referrmg to these figures, A denotes the tight tube wall-which is formed by two rows B and Cot vertical tubes. Gombustiongases pass from a combustion chamberE through the tight tube wall A at D where the latter is resolved. According to the invention the tube wall is resolved here so as to form three rows of tubes F, G, H, the two former having a considerably larger pitch than the original rows B and C. The formation of ridg- "ing deposits of solidifying liquid or pasty flue dustis avoided by this arrangement. For, previous to reaching the row of tubes H on its way between the largely pitched rows of tubes F and G, the flue dust has whereas the rows F and G are formed by the alternate tubes of original row B.

front of tube wall A the pitch of which tubes is so chosen that they are situated just in front of the individual tubes of the row F. Due to this arrangement they do not narrow the passage areas but notably contribute to a rapid coolin of the fluev dust particles. L denotes the tu es of the first row of vertical tubes behind the tight tube yall A.

The location of the tighttube wall itself K denotes protective tubes arranged in and that of the passage" for the gases within i this tube wall may be determined as desired.

What I claim, is

1. A water tube boiler having a tight tube wall composed of at least two rows of tubes and having a passage for the combustion gases, said passage being formed by spacing portions of the tubes of said tight tube wall so as to form a number of open rows of tubes which is greater than the number of rows the wall is originally composed of, the first of these open rows of tubes having a larger pitch than one of the remaining rows.

2. A water tube boiler having a tight tube wall composed of at least two rows of tubes and having a passage for the combustion gases, said passage being formed by spacin portions of the tubes of said-tight tube wa so as to form a number of open rows of tubes which is greater than the number of rows the wall is originally composed of, at least the two first of these open rows of tubes having a larger pitch than the remaining ones.

3. A water tube boiler having a tight tube a wall composed of at least two rows of tubes and having a passage for the combustion gases, said passage being formed by spacing portions of the tubes of said tight tube wall so as to form a number of open rows of tubes a which is greater than the number of rows the wall is ori inally composed of, protective tubes arrange in front of said tube wall and situated in the range of said passage 'ust in front of the tubes of the first of sai open rows of tubes.

4. A water tube boiler having a tight tube wall composed of at least two rows of tubes and having a passage for the combustion gases, said passage being formed by spacing portions of the tubes of said tight tube wall so as to form a number of open rows of tubes which is greater than the number of rows'the wall is originally composed of, protective tubes arranged in front of said tube wall and situated in the range of said passage just in front of the tubes of the first of said open rows of tubes, at least the two first of these open rows of tubes having a larger pitch than the remaining ones. v

5. A water tube boiler having a tight tube wall composed of two rows of tubes in alternately adjacent relationship, and having a passage for the combustion gases, said assa being formed by spacing portions 0 the tu es of said tight tube wall so as to form three open rows, the first two of these being formed from one of the first said rows of tubes and each of the'first two rows of tubes being formed of alternate tubes of the said row,

The foregoing specification signed at Hamburg, Germany, this 15th da of Jul 1929.

ALFRE HUS R.