US1576670A

US1576670A - Dust catcher

Info

Publication number: US1576670A
Application number: US458988A
Authority: US
Inventors: Frank R Mcgee
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-04-06
Filing date: 1921-04-06
Publication date: 1926-03-16
Anticipated expiration: 1943-03-16

Description

2 Sheets-Sheet 2 F. R. MCGEE DUsT cATHER Filed April e, 1921' flgm March 16 1926.

Patented Mar. 16, 1,926.

UNITED s'TA-Tss -r'nANK n. mona-on srnunnnvrnnn'onlo. i

DUs'r oA'rCnnnf Application fi'lea 'Aprile, 1921. sriai m458,988.

To all 'whom z't may con-oem:

Be it known 'that I, FRANK R. MoGnn, a citizen of theUnited States, and resident of Steubenville, inthe county of' Jelferson and State of Ohio, have invented certain new and useful Improvements ein Dust g Catchers, of which the following is a specification.

My invention relates to Cleaning gases, and while not limited to such uses, more'particularly relates to the removal of finely divided impurities, such as coke or flue dust, or similar impurities, from blast furnace gases, the gases evolved in the operation of by-product coke ovens, and similar appa-.

. isolating the separated impurities.

` line 111-111 of Figura 1.

A further object is to provide novel means for inducing a flow of low pressure gases through the impurity receiving Chamber to prevent back pressure therein.

A still furtherobject of my invention is the provision of a gas Cleaner having the novel Constructions, arrangments and combination of parts shown in the drawings, and to be described. in detail hereinafter and particularly pointed out in the appended Claims.

Referring now to the drawings forming part of this specification, Figure 1 1s a sectional elevation showing gas Cleaning apparatus embodying the. novel features of my invention.

- Figure 2 is a side elevation of the lower portion of my Cleaner. taken at right angles to the ysectional elevation of Figure 1.

Figure 8 is a seotional plan taken on the In the accompanying drawings, the numeral 2 designates the Cylindrical outer Casingcof my Cleaner which is enlarged 'adj'acent its lower end forming an impurity re- Ceiving Chamber 3 and provided with a frusto-Conical bottom wall 4, having a centrally arranged discharge opening Closed -by a bell 'having a Count'er-welghted Operating Control lever 6.

The portion o`f vthe Casing 2 abovethe impu'rity receiving Chamber 3 lforms an uptake 7 for the gas to be Cleaned, which enters the impurity receivng Chamber 3 through down- Comers '8 and 9.and vdischarges the heavier particles of impurities by gravity into the Chamber 3 before it rises through the uptake 7.

A tubular separating Chamber or member 10 is mounted within the uptake portion of the Casing 2 and spaced from the walls thereof and has its upper end Closed by a top 11. The upper end of the'casing 'is closed by a walll secured to the member 10 and the side walls of the Casing 2.

The separating Chamber 10 is provided adj'acent its upper end with a plurality of tangential inlet vanes '13 adapted to Cause the gases passing from the uptake 7 into the separating Chamber to take on a Centrifugalwhirling movement, to thereby centrifugally throw out lthe impurities in'an annular layer while expanding the gases Centripetally to form a central Core of Cle'aned gases.

The lower end of the separating Chamber 10 extends within a second impurity receiving Chamber 14 having a frusto-Conical bottom 15 opening intov the lower portion of the bottom 4 of the impurity receiving Chamber 3. The Chamber 14 is of greater diameter than the separating Chamber 10 and exi'tends upwardly around the separating cham'- ber 10 forminga pressure relief zone 16 from which gas is drawn to prevent back pressuraf The upper end of the impurity receiving `Chamber 14;' is Closed by a wall 17.

A Clean gas Outlet 'main 18 is arranged within the lower end of the separating Chainber 10 and spaced from the side walls thereof forming an annular trap space 19 adapted to ltrap the' annular layer of impurities thrown from the stream of whirling gases within the Separator and -direct said impurities into the Chamber 14. W

The outlet main 18 is adapted to receive the Central Core of Clean gases and'conduct them to a point of use. w

The main 1,8 is, in the form of a Venturi tube, that is, it Converges to the point 20 and -then diverges again, inthe shape of two truncated cones joined in their smallest diameters.` The result obtained by the use of such an outlet main is that the pressure of gas at a point immediately beyond the smallest diameter of the main is less than at any other point while the gas has a higher velocity. The reasons for desiring this low pressure area will be clearly explained below.

The outlet main 18 also acts as a choker during a slip, as during a slip the gases entering the separating Chamber 10 will have a higher Velocity and Athe great centrifugal effect due to this increased velocity together' with the novel construction of the Outlet main 18 will cause considerable back pressure to be created adjacent to the inlet end of the outlet main. The' back pressure created at this point serves. as a choker on the furnace, and smooths out sudden puffs indueed by a slip, and in this way provides a uniform flow of gases beyond the point 20 in the main 18.

An auXiliary Cleaning device 21 is located to oneside `of the main gas Cleaner and has an inlet conduit 22 commnnicating with the pressure relief zone 16 of the -impurity re- Ceiving Chamber 14. An outlet Condnit- 23 for the cleaned gases leads'from 'the Cleaning device 21 to the low pressure area of the outlet main 18, thereby establishing Communication from the pressure relief zone 16 of the' impurity receiving Chamber 14 through the inlet conduit 22, auxiliary Cleaner 21 and Outlet conduit 23 to the outlet main 18. The gases which enter the impurity receiving Chamber 14 with the .impurities are low in pressure, while the stream 'of Clean gases within the main 18 is of comparatively high pressure. Therefore to induce a flow of the pressure gases from the pressure relief zone 16 in the impurity receiving Chamber 14 through the auxiliary cleaner 21, into the clean gas outlet main 18, it is necessary to produce an area of low pressure, that is, pressure lower than that within the pressure relief zone 16 plus the pressure loss due to the travel of the gases through the auxiliary Cleaner 21. The novel construction of outlet main 18 shown and described produces the low pressure area desired and induces the flow of gases from the pressure relief zone 16 through the auxiliary Cleaner 21 and into the outlet main 18.

The impurities cleaned from the gases within the auxiliary Cleaner' :31 fall by lgravity through the conduit 25 which communicates with the impurity receiving Chamber 3 of the main Cleaning device. A

A rotary grizzly or other tvoe of mechanieally operated screen 26 is arranged below the Connterweighted bell 5 and is enclosed within a dust and gas tight casing 27 which opens at its lower end into a pug mill 28 which is also enclosed in a gas and dust roof casing 29. A discharge spout 30 leads rom the casing 27, through which particles not passing through the screen 26 aredischarged. The pugmill is adapted to mix the particles of impurities that pass through the screen 26 with water and to discharge the mixture into a car 31 or the like.

The impurities discharged through the opening Controlled by the bell 5 fall upon the screen 26 and the coarser particles of impurities such as cokeand the like are screened out of the mass and discharged through vthe spout while the finer particles or dust pass through the screen and fall into the pug mill 28 and are mixed with water and discharged into the car 31.

The counterweighted lever 6 controlling the bcll 5 is of suflicient weight to prevent the bell 5 from Operating until a predetermined amount of impurities have been dC- i posited within the Chamber 3, thus a sufiicient amount of impurities is maintained within the Chamber 3 to Seal the bottom of the seeond impurity receiving Chamber 14 and prevent the fiow of unclean gases from the downcomers 8 and 9 up through the chamber 14; and into the clean gas ontlet main 18.

A looking bar 35 is'threaded into a stand 36 below the counterweighted control lever 6 and is adapted to be engaged over the lever 6, when the pug mill is inoperative to prevent the hell 5 from opening to discharge any impurities into the mill,

VVhile I have shown but one embodiment of my invention, it will 'be understood that various modifications may be made without departing from the seope of my invention as defined in the appended claims.

I claimz- 1. 'A gas Cleaner comprising an outer casing, the lower portion of which is enlarged to form an impurity receiving Chamber and the portion above said impurity receiving Chamber forming an uptake for the gas to be Cleaned, a Vertical tubular Separator member arranged centrally within said outer casing and provided with a plurality of t-angential inlet ports at its upper end adapted to impart a whirlin'g mot'ion to the gases entering said Separator, a second impurity receiving Chamber extendingupwardly and around the lower end of said tubular separator, an outlet pipe of less diameter than said Separator member having its one end extending within 'said member so as to provide an annular trap space around its periphery for the escape of the impurities separated from the gas within the separating Chamber, and means for inducing a flow of gas through said second impurity receiving Chamber.

2. In a gas) Cleaner, a separating Chamber, means for imparting a centrifugal whirling movement to the gases entering said Chamber, an impurity receiving chambe1',a Venturi tube like clean gas outlet main Communicating with said separating chamber, said main having a high Velocity and low pressure area along its length, an auxiliary Cleaning device, a conduit communicating with said impurity receiving Chamber and said auxiliary Cleaning device, and a Conduit leading from said auxiliary Cleaning device to the high Velocity and low pressure area in said outlet main, whereby gas is iudueed to flow through said impurity reeeiving Chamber and through said auxiliary Cleaning device into said outlet main.

3. In a gas Cleaner, a separating Chamber, means for imparting a eentrifugal whirling movement to the gases entering said Chamber, an impurity receiving Chamber, a Venturi tube like Clean gas outlet main Communicating With said separating Chamber, said main having a high Velocity and low pressure area along its length, and means Communieating with said in'ipurity reeeiving Chamber and said high Velocity and low pressure area in said Outlet main to provide fora flowy of gas from said Chamber into said main.

4. A gas Cleaner Comprising, an outer Casing, the lower portion of which is enlarged to 'form an impurity receiving Chamber and the portion above said impurity receiving Chamber forming an uptake for the gas to be oleaned, a Vertical tubular Separator member arranged Centrally Within said outer Casing, said Separator member being provided with a plurality of tangential inlet ports at its upper end adapted to impart a whirling motion to the gases entering said Separator, a second impurity reeeiving Chamber arranged Centrally within said first named Chamber and extending upwardly around the lower end of said tubular Separator, a Venturi tube like Outlet main having its one end arranged within and spaced from said separating Chamber and adapted to Conduct the Clean gases from said separating Chamber, said tube by reason of its Shape being provided With a highvelocity and low pressure area, an auxiliary Cleaning device, a eonduit leading from the upper portion of said second impurity receiving Chamber to said auxiliary Cleaner, and a Conduit leading from said auxiliary Cleaning device to the high Velocity and low pressure area in said Outlet main, whereby a low pressure of gas is induced to flow through said impurity reoeiving Chamber and through said auxiliary Cleaning device into said outlet main. In testimony Whereof I have hereunto set my hand.

FRANK R.. MGGEE.