US1865907A - Gas purification - Google Patents

Description

y 5, 1932- R. HEINRICH 1,865,907

GAS PURIFICATION Filed Feb. 5, 19:51

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I I Ii WITNESSES: INVENTOR Is. flaw" @mwban/ I I mam/4 Hw /ch ATT'o NEY Patented July 5, 1932 UNITED STATES PATENT OFFICE? RICHARD HEINRICH, OI BERLIN-SUDENDE, GERMANY, ASBIGNORTO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION 01' PENNSYLVANIA GAB PURIFICATION Application filed l'ebruary a, 1881, lerlal lo.

- same weight of larger particles.

By the use of my invention it is possible to take advantage of the lesser deposition energy of the larger particles by coagulating or collecting the finer particles into comparatively large easily charged particles. I accomplish this result by sub'ecting the gas being treated to alternate hig -'tens1on direct current impulses and high-frequency damped alternating current impulses. The alternating current impulses coagulate the fine dust into conglomerate masses which are charged by the high-tension direct current impulse and driven from suspension to the collecting electrodes.

Other objects and advantages of m invention will be apparent from the to lowing detailed description taken in conjunction with the accompanying drawing, in which: Q

Figure 1 is a schematic diagram of an apparatus according to my invention, and

Fig. 2 is a time current diagram showing the manner in which the alternate impulses are applied according to my invention.

The apparatus disclosed in the drawing comprises atreating chamber 1 having a collecting electrode 2 therein and a charging or ionizing electrode 3 electrically insulated and se arated from the collecting electrode.

he treater, chamber '1 is provided with suitable assages 5 for the admission or discharge of the as to be treated, which is conducted throug the treater chamber in any desired manner, such as by a blower or fan by natural draft or other means.

A high tension transformer 8 supplied from an alternatin current line 9 provides a source of high-tension electrical current. In the preferred embodiment of my invention,

518,150, and in Germanyl'ebrnary 10, 1880.

one side of the high-tension secondary is groundedand the other side is lead to'the terminal 10 ofa synchronous commutator 12. The lead 14 is provided from the commutator to the charging electrode 3 of the precipitator. The commutator 12 is synchronized with the high-tension output of the transformer 8 so that during alternate half cycles the transformer is connected through the commutator to the electrode 3 to provide a direct or unidirectional current impulse to the electrode. During the other half cycle the transformer 8 is disconnected from the electrode and during this half cycle the commutator 12 connects electrode 3 to a terminal 16 of a hi h-frequency generator such as aTesla trans ormer 20, which is, in turn, fed by an alternati current line 22 which may be, if desire identical with the line 9. I

In the operation of my device, the commu& tator 12' alternately. connects electrode 3 to the transformers 8 and 20 so that the gases in the treater are alternately subjected to high-tension unidirectional currents and to damped high-trequency alternating currents. This is graphically illustrated in Fig. 2,- which shows the time current relation in my device, the high-tension unidirectional surge being illustrated by the loops 30 of the curve and the high-frequency surge by the loops'35. The damped high-frequency surge coagulates or conglomerates the small particles of the impurities in the gas into comparativel large particles, which are then charged by e succeedin unidirectional surge and driven to the col ecting electrodes. This alternate coagulation and charging is repeated many times during the passage of the gas adjacent to the electrodes so that all or comparatively all of the fine (particles will be coagulated and precipitate with the ex comparatively small amount 0 energy to that which would be necessary to charge and precipitate, each small particle as originally found in the gas.

nditure of a While I have shown and described a specific embodiment of my invention, it is apparent that changes and modifications could be made therein without departing from the s irit and scope of my invention. I desire, t erefore,

that only such limitations shall be imposed as are indlcated in the appended claims or as ma be necessitated by the prior art.

claim as my invention:

1. A precipitator comprising a recipitator chamber, a set of collecting anh a set of ionizing electrodes therein and means for applying alternately unidirectional and damped alternating current to the set of ionizing electrodes.

2. A treater for cleanin gas comprising a treating chamber, means or passing the gas to be treated through the chamber, a collecting, electrode in said chamber for collecting the foreign matter in the gas, a charging electrode separated from the collecting electrode, a transformer for supplying a high voltage current, a transformer for supplyin a high frequency alternating volta e and means for alternately COIIIIGCtlDf sai transformers to the charging electro e.

. 3. A gas purifier comprisin through which thegas to be purified is passed a plurality of electrodes in the chamber, a source of pulsating hi h tension current, a source of damped high requency current and means for alternately connecting said sources to an electrode in said chamber.

4. A treater comprising a treating chamber, a ohargin electrode, means for produc-v ing a dampe high frequency current for coagulating the particles to be precipitated, means for producing a high tension current for ionizing the partlcles and means for alternately connecting said currents to the charging electrode.

5. A treater for cleaning gaseous fluids comprising a treating chamber, a plurality of electrodes therein, a transformer for supplying high tension currents, a transformer for supplying high frequency dam d currents and a synchronous commutator or alternate- 1y connecting said transformers to one of said electrodes.

La testimony whereof, I have hereunto subscribed my name this 12th day of January 1931.

. RICHARD HEINRICH.

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