US1796436A - Purifier in drain vent pipes - Google Patents

Description

March '17, 1931. G. D. BRADSHAW 1, 9 4

PURIF'IER IN DRAIN VENT PIPES Filed Sept. 30. 1927 [/v VE/Y o: Z5 I 5 Gran zlfircim fi Patented Maia-17, 1931 UNITED STATES PATENT OFFICE GRANT D. BRADSHAW, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAV-KNOX COMPANY, BLAXVNGX, PENNSYLVANIh, B. CGRIEORA'IIGN OF NEW JERSEY PURIFIER IN DRAIIT VENT PIPES Application filed September 30, 1927.

This invention relates to fluid separators and particularly those used for purifying gases such as steam by separating from the gases liquid particles and other impurities.

5) It has for one of its objects providing means for increasing the efiiciency and the capacity of the separators by reducing the tendency of the Water chambers and passageways of the separator to overflow or become clogged, and a particular object is to provide improved means for the passage of air, steam, or other gases from the water passageways and pipes and collecting chambers so as to prevent interference with the free flow of the water or other liquids.

Although the invention is applicable to Various types of separators used for various purposes, yet for the purposes of illustrating my invention I describe it as applied to steam separators used for drying and purifying the steam in boilers, and particularly to that type of separator known to the trade as Tracyfiers.

Of the accompanying drawings, Fig. 1 is an elevation of a boiler and steam purifying system which embodies the features of my invention, the boiler of the system being in section; Fi 2 is an enlarged transverse sectional view along the line 2-2 of Fig. 3; Fig. 3 is'a vertical sectional view along the line 33 of Fig. 2; and Fig. 4 is an enlarged sectional View along the line 4-4 of Fig. 1.

In my copending patent application, Serial No. 211,286 I have shown asteam purifying system in which the purifying elements are mounted in a boiler. and the moisture separated from the steam is passed into a steam trap and a vent pipe is provided leading from the steam trap to the purifier so as to reduce thetendency of the drain pipes or steam trap to become clogged with water. The object of the present application is sim ilar but it is sometimes desirable to connect.

the vent pipe to the system at a point where the pressure is as low as possible so as to increase the tendency of the entrapped steam or air to flow out of the steam trap. I have therefore in this present application connected the vent pipe with the steam main of the boiler system. Also, whenever the steam Serial N 0. 223,014.

vent is connected to the steam chambers or pipes of the system I have found it desirable to insure the purity of the steam or gas which flows back through the vent to the system. For this purpose I insert in the vent pipe means for purifying the gas that isreturned to the system.

In carrying out my invention in this instance l have applied it to a boiler system in which the steam separator 10 is mounted on the boiler or drum 11. A system of drain pipes 12 is connected to the purifier in any suitable manner,-and the drain pipes are connected to a steam trap 13. The steam trap may be of any suitable construction for the purpose of receiving waste water and discharging it wherever desired, and it has a water space 17 and a steam space 18. In order to relieve the steam trap of any pressure which might result from the accumulation of air or steam in the trap, I provide a vent pipe 14 connecting the upper portion of the steam trap with the boiler system. While the pipe 14 might be connected with the steam purifieritself or to any portion of the boiler system, I prefer to connect it by means of a pipe 15 with the steam main 16 of the boiler system. As is well understood, the steam pressure in the steam main is normally somewhat lower than the pressure in the boiler or in the steam chambers of the purifier; so that, with the pipe connected to the steam main, the entrained steam or gas passes more freely out of the trap or out of the drain system 12.

Inasmuch as, with a system of this nature,

the aim is to purify and dry the steam very perfectly, it is desirable to dry and purify the steam which passes from the steam trap into the steam main. sert in the vent pipe 14 any suitable steam purifying means such as the purifier 20.

lWhile it is to be understood that any suitable purifying means may be used for this purpose, yet I prefer the purifier which comprises acasing 21 in which are mounted vertically steam purifying baffles lhe steam passes from the steam trap 13 into the purifier 20, and in passing through the purifier it passes through the bafiles 22 and thus For this purpose I ina through the pipe 15 to the steam main. The moisture that is separated from the steam by the purifier 20, and any impurities, fiow downwardly to the lower ends of the battles 22 into the chamber 23 and thus to the pipe 2% into the water chamber of the tra A plate above the chamber 23 prevents the steam or water from the trap or the pipes l-lor 2-i from passing through the purifier 20 without passing through the battles It will thus be seen that l have provided means whereby the boiler purifier will be freely drained of its waste water. Any steam or air which does not pass freely back from the drain pipes to the boiler purifier, will be carried by the waste water into the trap, and .in there it will pass 'lreely into the steam system of the boiler. But the purifier 2O prevents any moi we or impurities of any nature from passing with the air or steam back into the boiler system. Obviously, modifications might be made in the apparatus that I have illustrated and de scribed without departing from the spirit of my invention. Anl I do not wish to limit my invention to a purifier mounted in the boiler. The benefit of the invention would follow the use of a purifier anywhere in connection with the boiler system, such as mounted in the steam main of the system.

lowever, in order to provide for a free flow of gas from the trap back to the generating system, it is desirable to connect the return pipe 15 to the system at a point where the pressure in the system is lower than the pressure on the liquid flowing into the drain pipe 12 to the tap. For this reason, I prefer to connect the return pipe to the gas main of the system, and I thus obtain the benefit of the fall in pressure between the liquid chamber 30 of the purifier to the gas main 16, owing in part to the passage of the gas through the battles 27 and through the steam inlet 31. However, the particular manner in which this tall in pressure is produced is not a feature of my invention. For instance, the pipe 15 might communicate with the passageway 33 of the purifier. The plate 3+1: and the steam fiow distributing means 32 would provide ample pressure drop for the purpose. As there is no steam flow through toe lower ends of the bafiles 27 into the water chamber 30, the pressure in this chamber is substantially equal to the steam pressure of the boiler, while the pressure in the chamber 35, o ving to the flow of steam through the bafiies, is materially less than the pressure in the boiler.

On the other hand, in case of the purifier 20, the drain pipe 2l is connected at a point of lower pressure than the vent pipe 142, and, hence, to provide flow downwardly in the pipe 24;, a water head in the pipe is desirable, and this is provided for by elevating the purifier materially above the trap.

I claim as my invention:

1. The combination 01 a steam boiler systen'i, a steam trap, a steam purifier arranged to purify the steam generated by the boiler of said system, a drain pipe connecting said purifier with said trap, 21 second steam purifier, a steam pipe or conducting steam from said second purifier to said sys tem, steam pipe for conducting steam from said trap to said second purifier, and a drain pipe coimectingsaid second purifier with said trap.

The combination oi a steam boiler having a steam main, a steam trap and two steam purifiers said trap and said purifiers each having a steam space and a water space, one of said purifiers being mounted in said boiler, pipes opcrativcly connecting the steam space of the other purifier respectively with said steam main and with the steam space of the trap, and a pipe arranged to conduct water from the water space of each purifier to the water space or the trap.

3. The combination of trap and two gas purifiers, each of said purifiers having a gas inlet, gas outlet and a liquid outlet, said trap having two liquid inlets and a outlet, a pipe for conducting liquids from each of said purifier liquid outlets to said trap inlets, a pipe for conducting gas from said trap gas outlet to one of said purifier inlets, and communicating means connecting said purifier gas outlets.

4.-. The combination of a gas generating system, a liquld trap, and a gas drier having a liquid collecting chamber, the system having a gas mam for delivering gas from the generator oi the system through the drier, a drain pipe for conducting liquid from the liquid chamber of the drier to said trap, and means for conducting gas from said trap to the gas main of said system.

5. The combination of a steam boiler, a steam purifier, and a steam trap, said purifier having a water chamber and a steam chamber, a pipe for conducting water from said water chamber to said trap, a p1pe for conducting gas iirom said trap and communicating with said steam chamber, and means for preventing steam ilow trom said water chamber to said steam chamber.

6. The combination of a steam trap and a steam purifier, said trap having a water space and a steam space, said purifier having a water chamber and a single steam inlet, means for conducting steam from said steam chamber of the trap to said steam inlet, and a pipe for conducting water from the water chamber of the purifier to the lower portion of the water space of the trap, said pipe running upwardly from its point of connection with said trap a very material distance, and said steam communicating means being free from water pockets.

7. The combination of a steam purifier lLej perforate, a pipe for conducting steam from I said trap to said inlet, a pipe for conducting water from said water outlet to said trap,

and means for passing steam away from said purifier through said steam outlet.

In testimony whereof, I hereunto set my hand.

GRANT D. BRAD SHAW.

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