US1934714A - Superheater arrangement in water tube boiler - Google Patents

Description

Nov. 14, 1933. c, HULSART SUPERHEATER ARRANGEMENT IN-WATER TUBE BOILER Filed 001:. 17, 1928 w ad BY PM ATTORNEY;

boiler to the downtake headers.

Patented Nov. 14, 1933 lfiiiJM v" w s q @Ain.

err easier.

SUPEEHEATER ARRANGEMEN IN WATER TUBE Bonita Application October 17, 1928. Serial No. 312,991

6 Claims.

This invention relates to the arrangement of a superheater in a Watertube boiler so that the superheater tubes passin groups between nipples connecting the steam and water drum of the The invention will be understood from the description in connection with the accompanying drawing, in which Fig.- 1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is a section along the line 22 of Fig. 1 and Fig. 3 is a section along the line 33 of Fig. 1.

In the drawing, reference character 1 indicates the steam and water drum of a watertube boiler having its water space connected by means of nipples 2 to the downtake headers 3 that are connected by a bank of inclined tubes 4 to the uptake headers 5 which are in turn connected by the circulating tubes 6 to the steam space of the steam and water drum 1. An outlet 7 for the 20 spent gases is shown at the top so that the gases pass out between the nipples 6. A baflle 8 eX- tends from the upper end of the uptake headers 5 to the outlet 7 and a wall or baiile 9 extends from the uptake headers 3 to the steam and water drum 1. A layer'of refractory material 10 may be applied to-the gas side of the steam and waterdrum 1 and extend across the tubes 6.

A row of tubes 12 connects the steam space of the steam and water drum 1 to the superheater inlet header 13. A row of superheater tubes 14 extend through spaces between the nipples 2. These tubes are provided with return bends having Y-connections 16 at one end for supporting the same upon the bafiie 9. The outlet ends of the tubes 14 also extend through the spaces between the nipples 2 and enter the outlet header 15.

The inner end of the superheater tubes may be supported on a support 17 that rests upon the inclined tubes 4. A number of straps 18 extend from the steam and water drum 1 to the outlet header for supporting it and a number of straps 19 support the inlet header 13 from the outlet header 15, lugs or fins to which the straps 19 are connected being provided on the headers 13 and 15 for this purpose.

The lower ends of the nipples 2 are preferably arranged in a row as indicated in Fig. 1. In order to provide spaces for the inlet ends and the outlet ends of the superheater tubes 14 to pass between the nipples 2, the nipples are preferably divided into groups, with two nipples in each group in the embodiment illustrated, and the nipples are bent a short distance above the ends of the headers 3 out of the plane of said row and so that the spaces between the nipples through which the tubes 14 pass are twice as Wide as they would ordinarily be. The portions of the nipples 2 between which the tubes 14. pass are parallel to each other and the'center line distances between these portions are made twice that of the center line distances between the headers 3 by bending alternate tubes away from each other in a direction at about a angle to the vertical plane passing through the center line of the steam and water drum 1. The portions of the nipples 2 above the bends are in pairs in planes that are perpendicular to the center line of the steam and Water drum 1 and the nipples enter the drum in pairs of holes displaced circumferentially on the drum 1. r The projections of the ends of adjacent nipples thus lie at the corners of a square. By this arrangement the tubes 14 may be passed between the nipples 2 in groups as shown most clearly in Fig. 2, the outer tubes 14 of the groups being slightly bent for this purpose if desired.

I claim:

-l. In a water tube boiler, a steam and water drum, nipples connected to the water space of said drum, a bafile wall positioned inwardly of thenipples, fluid heater tubes passing between said nipples and having return bend sections supported by the baffle, the lower portions of said nipples lying in a row extending longitudinally of the axis oi said drum and having their upper portions bent out of the plane of saidrow so that a plurality of nipples lies between two fluid heater tubes and spaced longitudinally thereof, and fluid heater headers supported below said drum.

2. In a water tube boiler, a steam and water drum, nipples connected to the water space of said drum, a bafiie wall adjacent the nipples, fluid heater tubes passing between said nipples and having return bend portions supported by the battle, the lower portions of said nipples lying in a row extending longitudinally of the axis of said drum and having their upper portions bent out of the plane of said row so that a plurality of nipples lies between two fluid heater tubes and spaced longitudinally thereof, and fluid heater headers supported below said drum, said fluid heater headers lying outside of said nipples. v

3. In a water tube boiler, a steam and water drum, nipples connected to the water space of said drum, fluid heater tubes passing between said nipples, said nipples being bent so that a plurality of nipples lies between two fluid heater tubes, fluid heater headers supported by said drum, said fluid heater headers lying outside of said, nipples, and a baiiie located near the inner side of said nipples and forming a support for said fluid heater tubes.

4. In a water tube boiler having a steam and water drum, a circulatory system connected thereto and including downtake headers arranged 1ongitudinally of said drum, nipples connected to said headers and having the lower portions thereof located in a row in the plane of the headers, a fluid heater encompassed by the circulatory system of the boiler, fluid heater inlet and outlet headers spaced from the downtake headers, a baffle wall positioned inwardly of the headers, returnbend superheater tube sections supported by the baflie and positioned uprightly, and upright rows of fluid heater inlet and outlet tubes disposed between rows of the nipples and connected to said sections, said nipples being arranged in groups, the nipples of each group being bent out of the plane of said row and entering the drum through holes displaced circumf erentially of said drum.

5. In a water tube boiler, a steam and water drum, downtake headers below the drum, nipples connected to the water space of said drum and the downtake headers, fluid heater inlet and outlet tubes passing between said nipples above said headers, said nipples having their upper parts bent so that a plurality of nipples lies between two of said tubes, return bend sections connected to tubes, fluid heater headers supported below said drum, said fluid heater headers lying outside of said nipples, and a bafile located near the inner side of said nipples and forming a support for said fluid heater tubes and said sections.

6. In a boiler, a steam and Water drum, uptake and downtake headers, nipples connecting said downtake headers to said drum, circulating tubes connecting said uptake headers to said drum, a bank of inclined tubes connecting said headers, a fluid heater located between said circulating tubes and said bank of inclined tubes, a baffle near the inner side of said nipples, and Y-connections for the ends of tubes of said fluid heater extending into said ba fle and supported thereby.

CHARLES A. HULSART.

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