US2731832A - johnson - Google Patents

Description

Jan. 24, 1956 J. A. JOHNSON WATER-COOLED GAS SAMPLING DEVICE Filed Jan, 5, 1954 United States Patent() 2,731,832 WATER-COOLED GAS SAMPLING DEVICE James A. Johnson, Rahway, N. J., assigner to The American Metal Company, Ltd., New York, N. Y., a corporation of New York Application January 5, 1954, Serial No. 402,268

1 Claim. (Cl. 73-421.5)

The present invention relates to a gas sampling device forA use in the periodic or continuous analysis of gases from reverberatory metal smelting furnaces and the like and aims to provide certain improvements therein.

t e sampling of corrosive dust laden gases at elevated reduced.

A fur which diierential expansion and mental elTects upon A still further object of the invention is to provide a gas sampling device which will permit easy replacement of the gas sampling tube when required.

The foregoing and other objects of the invention not specifically enumerated are accomplished by forming a gas sampling device as hereinafter described and shown in the accompanying drawing, wherein:

Figure 1 is a diametrical section of a gas sampling device embodying the invention.

Fig. 2 is a fractional view similar to Fig. l showing a modification.

the gas sampling device may be said to consist of a tubular metal casing -heavy or thick wall posed in spaced relation betweenv the and the casing 10.

e casing 10 is except for passages 16 I accommodating the pipes l2 and 13, respectively. vSaid shown at 19."A

accommodating a water educt or discharge pipe (not shown) vT-fittin'g 24 connection of a hose thereto for blowing-out the tube.

13 may be suitably formed of pipe and at its end which projects outpreferably terminates about 4 to 6 inches from the end wall 14 and the distance between said educt end and said end wall should be at least as large as the diameter of the casing 10.

In Fig. 2, a manganese bronze section 22a is shown as detachably coupled to the inner end 13 and the end wall 14 of the casing.

In use, the gas sampling device, after being installed so that one end extends into the corrosive gas atmosphere of a reverberatory metal smelting furnace and the like for a distance of from 18 to 24 inches, will be exposed to the bronze section 22 or 22a, and upon filling the casing, discharging therefrom through the discharge, nipple 20. In the course of this owing action the water will conduct Patentedv Jan. y24, 12956j he casing, as shown".t

Threaded into the vother is a screwplugv`25y which".`

heat ,away fromithe inserted: end of the casing and the Although certainpreferred embodiments of the'inventubular section 22 or 22a. The rate of ow of the water tion have been disclosed, it is to be understood that changes is so controlled that the ltemperature of the endv 11 of the in the specic construction, arrangement;V of parts yand of casing will not be cooled down to the dew point of the materials used may be resorted to within the range of gases within the furnace and hence will preclude the con- 5 mechanical and engineering skill without departing from densation of such gases on the parts of the device exposed the spirit of the invention as claimed: to the gases whereby a corrosive solution would be formed What l claim is: Y which would eat away the parts in question. By the A device for sampling gas from a reverberatory metal Y same token, the thickened steel wall of the casing 10 pro-V smelting furnace and the like comprising in combination, vides a poor conductor of the heat from the furnace to V1i) a tubular metal casing one end of which is adapted to be the circulating water and hence the temperature at the located inthe gaseous atmosphere of the furnace, said cas-5v outer surface of the casing in use is not cooled down to ing having mounted therein a gas sampling tube the gas the dew point of the gases within the furnace, The intake end of which terminates in and is secured to an end thickened wall on the manganese bronze sections 22 and Wall 0f the Casing which iS adapted tOvbe located lin the 22a provides increased life for said section of the gas 15 gaSOuS atmesphefe and a Water Supply tube extending sampling tube since it is said portion of the tube which is through and beug Secured t0 au' eud Wall 0f the Casing, subject to the greatest corrosive action of the furnace Said Water tube beine disposed in spaced relation between gase5 the gas sampling tube and the side Wall of the casing and Experience has taught thatcorrosion will slowly take eHCOmPaSSug the gas Sampling tube fel the greater Part place at the entrance end of the gas sampling tube which 2o of its length, theend walls Closing @if the casing except is disposed within the furnace and in the course of time, fer passages fer the tubes, ene end of said gas sampling, the inner wall of the tube will be eaten away along a contube extending through the COfleSPOndBg end Gf the" icai'path from the open end of the tube to about one-third Water 'Supply tube and adapted for Connection with means" the distance from the end wall 14 to the educt end of the ,for aspu'auug gas from the furnace atmosphere, the Water water Supply pipe 13 v 25 supply tube having its water induct end spaced inwardly" Should it become necessary to replace the gas sampling from the Outlet eud 0f theges Sampling tube und a {teelt-ed tube, this can be readily accomplished by removing the gland et Stud eud 0f Said Water Supply' tube eugegu device from the furnace, disconnecting the sampling tube afeuud the gu? Samplug tube Wueeby Said Sampling tube' from the r-fitting 24, melting away the brazen joints z3 may move axlelly due te expenelen and contraction, relai,

and withdrawing the tube from the easing.L since it is so tively te thewafer Supply tube and te the easing. only the short section of the gas sampling tube through which the gas enters that becomes corroded, it will be ap- References Cited in the file of this patent f f parent that the section 22 or 22a only, will require re- `UNITED STATESV PATENTS i Placement i 1809 3'24 A t' 1 Y t Experience has shown that, whereas gas sampling tubes 35 1890592 Y 'stlnmef ".""'1')J;nc'1" heretofore used in the analysis of gases from reverber- 2356845 Hines' Aug' 29' 194,4 atory metal smelting furnaces had a useful life of from 5501933 My 1 1951;'

two to three weeks, the device of the present invention has shown a useful life of up to a year and more.

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