US2598262A

US2598262A - Construction of air and gas heater

Info

Publication number: US2598262A
Application number: US218108A
Authority: US
Inventors: Janson Josef
Original assignee: PFALZISCHE CHAMOTTE und TONWER
Current assignee: PFALZISCHE CHAMOTTE und TONWER; PFALZISCHE CHAMOTTE- und TONWERKE (SCHIFFER und KIRCHER) AG
Priority date: 1950-05-03
Filing date: 1951-03-29
Publication date: 1952-05-27
Anticipated expiration: 1969-05-27

Description

May 27, 1952 J. JANSON CONSTRUCTION OF AIR AND GAS HEATER Filed March 29, 1951 Inventor:

Alfom e v Patented May 27, 1952 CONSTRUCTION OF AIR AND GAS HEATER Josef Janson, Grunstadt/Pfalz, Germany, as-

signor to Pfalzische Chamotteund Tonwerke (Schifier and Kircher) A. G., Eisenberg/Pfalz,

Germany Application March 29, 1951, Serial No. 218,108 In Germany May 3, 1950 1 Claim. 1

This invention relates to the construction of air and gas heaters for melting furnaces or the like,

In the heating of an air and gas heater, the heating gases flow through the upper part thereof at high velocity owing to their great volume and rapidly yield their heat to the brickwork of the heater. The volume and therefore the velocity of the gases decreases during their downward movement in accordance with their progressive cooling. To maintain the velocity of the gases as far as possible various proposals have been made, for example it has been proposed to employ bricks having projections extending into the lower portions of the passages of the heater or to fit special bricks into the passages. By increasing the mass of brickwork in the lower part of the heater in this manner, however, heat exchange becomes progressively more ineifective towards the lower part of the heater, and the cost of installation is increased.

The object of this invention is to provide a construction of brickwork for an air and gas heater which will overcome the above disadvantage and to this end according to this invention an air and gas heater is constructed from bricks of constant quadratic cross section, having rectangular passages extending through them and recessed free spaces in their side faces, the Width of the passages in the bricks decreasing progressively from the upper to the lower part of the heater, the total cross sections of the passages and the brick mass respectively remaining approximately constant, the bricks in the upper part of the heater being arranged so that the passages therein form continuous uninterrupted ducts and the bricks in the lower part of the heater being arranged so that the passages in each layer of bricks are disposed at right angles to the passages in the bricks in adjacent layers.

The invention is illustrated by way of example in the accompanying drawing in which:

Figure 1 shows one filling brick,

Figure 2 shows a second filling brick,

Figure 3 shows a third filling brick,

Figure 4 shows in plan four filling bricks as shoiTiriFigure 1,

Figure 5 shows in plan four filling bricks as shown in Figure 2, and

Figure 6 shows in plan shown in Figure 3.

The bricks I shown in the accompanying drawing are all of constant quadratic cross section, having rectangular passages 2 extending through them and recessed free spaces 3 in their side faces.

The width of the passages 2 in the bricks I shown in Figures 1, 2 and 3 progressively decreases though the total cross sections of the passages and the brick mass respectively remain approximately constant, and in an assembled four filling bricks as filling for an air heater these bricks are disposed in zones one above the other, each zone consisting of several layers of one type of brick. Thus, for example, a zone of bricks as shown in Figures 1 and 4 is disposed at the upper end of the heater above a zone of bricks as shown in Figures 2 and 5, successive layers of bricks being arranged so that the passages 2 therein form continuous uninterrupted ducts, while below them are arranged respectively a further zone of bricks as shown in Figures 2 and 5 and a zone of bricks as shown in Figures 3 and 6, successive layers of bricks being arranged so that the passages 2 therein are disposed at right angles to each other.

With the bricks 1 arranged in this manner the heating gases can flow without hindrance at high velocity through the upper part of the filling, while in the lower part the fiow of gases is constricted and accelerated at the'crossing points of the bricks, eddy currents being set up, whereby the coefficient of heat transmission and consequently the heat transfer are increased. Thus the entire filling is effectively utilised while the continuous uninterrupted ducts in the upper part thereof protects the bricks from the danger of fusing together.

I claim:

An air and gas heater for a melting furnace and the like constructed from bricks of constant quadratic cross section, having rectangular passages extending through them and recessed free spaces in their side faces, the width of the passages in the bricks decreasing progressively from the upper to the lower part of the heater, the total cross sections of the passages and the brick mass respectively remaining approximately constant, the bricks in the upper part of the heater being arranged so that the passages therein form continuous uninterrupted ducts, and the bricks in the lower part of the heater being arranged so that the passages in each layer of bricks are disposed at right angles to the passages in the bricks in adjacent layers.

J O-SEF JANSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,908,143 Grilli May 9, 1933 1,964,830 Pohl et al. July 3, 1934 2,018,224 Otto Oct. 22, 1935 2,172,714 Schack et a1. Sept. 12, 1939 FOREIGN PATENTS Number Country Date 672,940 France Jan. 8, 1930