US1812072A

US1812072A - Apparatus for distributing and circulating air

Info

Publication number: US1812072A
Application number: US278684A
Authority: US
Inventors: Arms George Lyman
Original assignee: Roberts and Schaefer Co
Current assignee: Roberts and Schaefer Co
Priority date: 1928-05-18
Filing date: 1928-05-18
Publication date: 1931-06-30
Anticipated expiration: 1948-06-30

Description

G. L. ARMS June 30, 1931.

' APPARATUS FOR DISTRIBUTING AND CIRCULATING AIR Filed May 18, 1928 2 Sheets-Sheet 1 [2% #02222" 660 (Z firms M m Jf/arngym June 30, 1931; G. L. ARMS 1,812,072

APPARATUS FOR DISTRIBUTING AND CIRCULATING AIR Fileu May 18, 1928 '2 Sheets-Sheet 2 3 fnye/zfo r dear c Z. 1772? I Patented June 30, 1931 GEORGE LYMAN AB s, or CHICAGO, ILLI'noIs, As'sIG oitTo nonnn'rs AND SCHAEFEB COMPANY,'OF CHICAGOLILLINOIS, A CORPORATION. OF-ILLINOIS' I APrAnA'rUsnon DISTRIBUTING-AMI) oIRoULATmG AIR.

' Application use m 1 ,31923. SeriaI No. 278,684. g l

' My invention'relates-to improvements in apparatus for distributing and circulating air. It has for one object to'provide anew and improved apparatus .forand meansfor controlling 5 and circulating the air which" ef fects cleaning and s'eparationwithout providing 'an exc'essivel'y great-quantity of air from which dust must be separated before it is discharged into the outer atmosphere. Another object of the invention is to make'itj possible to use large'volumes of air for coal" cleaning and treating and to remove the dust from such air without separately treating and dust cleaning the total amount of the air in the system. Other objects will appear from time to time throughout-the specification and claims. p u I My invention is illustratedmore or less ings wherein throughout.

' The coal treating, separating air cleaning plant is of the type well-knownto the art wherein there are a plurality of'coal clean ing tables, it ,being'understood that the coal :320 is classified as .tosize before being fed to the tables and each tablereceives coal mixed with the refuse as'itfcomes from the mine of a size for each table conforming to the general. character'of the table; It will be understood'thatthe-table which treats the small or fine coal particle's requires much less air than the'table which treats the "coarser particles,

and thefine coaltable is equippedwith' a small fine pervious sc'reenfd'eck, the other lutely pureair must be fed to theunderside of' thej fine deck, a; certain amount of: dust in ghle air as it is fedto the coarser decks isnot ct. .A general descriptionv of one deck will suflice for all. The "table, unit. comprises a blower A" supplying a'irfundei" pressure diagrammatically in the accompanying drawgravity.

diagrammatic side elevation;

Like parts are indicated by like characters tablesas they handle larger and largersi'zes 'ofcbal being equipped with progressively increased sized screens forming thedecks. It. will further-be understood that whileabsodeck A Thefair passes through thisdeck at through a conduit to a funnel or vas. ch mney A on the underside [of aIp'ervious relatively high velocity and passes through a continuously flowing sheet of material on the deck-. The supporting 7 means --A are provi'de'djto adjust the angle, of inclinationofthe deck and the linkage A is provided to sup;

port'the deck and-permit it tobe'reciprocated i by the eccentricwheeliAflfconnecting rod A? the wheel being driven through a gear train A? from thefan shaft, whi'ch in turnis driven by a motor A A is affeed hopperfdisa charging through the chute-A onto' the surface of the deck, the mixed coaland reiuse suppliedybyany suitable. conveyor A It will be understood that thepurpose of the deck is to separate the coal and the refuse by Located aboveeach deckis a=hood B; there being'a flexible bellows B extending down the reciprocating deckrand the fixed hood but l there must be space between the deck and the of coal and refuse to be treated and for the discharge of the separated coal andrefuse. B isa suction pipe leading from the top, of

or handled by the varioustables. a I' have numbered the tables from right to [from the hood to and engagingthe deck to -make-ia generally dust tight join t'between 5. ihdod hrough the bellows .jfo admissioh I 'left a's 1, to 5 inclusive. Number 1' is the finest table and the other tablesincrease in coarseness, of screen and by material treated by them and increase in air requirements. from Into 5 though it willbe'understood that a greater orless number of tables mightbe used. i

C is an air the example which I have shown thistable because ifthere' weredust in the-.air it would.

amt through which air is drawnto the fan A for, tablenumber 1. In

requires 4.0OO cubic rector air. This air is p jcleaned before it is forced through the screen the pipe B into the dust settling chamber though this chamber might be dispensed with if that were desired and then drawn through a suction pipe G which pipe carries 4,000 feet of air plus the amount of air which enters in through the bellows between the deck and hood on the fine table. This approximately 4,000 feet is drawn into the fan which feeds air to Number 2 table. This table requires 6,000 feet of air, 4,000 plus the make-up air as I prefer to call it, entering between the hood and deck on the fine table and comes to the fan through the pipe C The supply to make up the 6,000, that is 2,000 feet less make up enters the fan A for the second table through an adjustable intake opening C The 6,000 feet of air passes up through the pipe A in the funnel and deck to the hood as above pointed out. From the hood B is drawn through the pipe C 6,000 cubic feet of air plus make-up from table Number 2. This 6,000 feet of air is discharged into a make-up manifold C the pipe C discharging into that make-up manifold and the make-up manifold discharging into the fan A associated with Number 8 table. This pipe C discharges 6,000 cubic feet of air.--

The deck itself needs 9,000. In this case to avoid drawing in an excess of make-up air the dust laden air is recirculated from the hood B associated with Number 3 table through a recirculation pipe C which pipe also discharges into the manifold C This pipe will discharge into the manifold 3,000 feet less make up so that a total of 9,000 feet is discharged to the deck. The control valve C is provided to add if necessary an additional supply of air to the makeup manifold to insure that the proper amount of air is fed to the deck. This make-up manifold and control valve is found in connection with tables Nos. 4 and 5 also.

From the hood B of table No. 3 is withdrawn through the settling chamber and through the pipe C only 6,000 feet plus make up. 3,000 feet is recirculated between the hood and fan of No. 4 from the pipe C and 3,000 feet is introduced controlled by the valve C to give a total 12,000 feet of air to work the table. F rem the hood of table No. at is drawn 9,000 feet of air through pipe C to the make-up manifold of table No. 5. 3,000 feet is recirculated through the pipe C and only 4,000 feet is drawn off through the pipe 0 to the dust separating apparatus It will be understood, of course that these amounts are only generally stated. There may be considerable divergence in any particular set of tables between make-up recirculation and transfer from one table to an other because this apparatus must be set up to take care of the peculiar characteristics of the coal which is treated and because every operator who adjusts or sets up a plant is likely to make slightly different adjustments from the other but however these adjustments are made, it always results in maintaining that part of the system between the fan and the deck under pressure and the balance of the system under suction so that all leakage is inward. The dust is always thus kept in the system and the dust in the air forced through any table except the smallest one is some of it deposited with the coal passing through the table. The remainder only that which is carried out with the 4,000 feet or relatively small amount fed to the dust separator is the only dust which gets out of the system except with the coal and slate as it is discharged.

Experience shows that there is a limit beyond which the air is unable to carry dust so that when the air reaches the dust saturation point any additional dust is deposited on the coal or settled out through the settling chambers. The reason for using the settling chamhers is to provide means for recovering the coal dust which is valuable and to make it unnecessary to circulate through the system and through the fan large and heavy quantities of dust and to prevent discharging from the tables excessively dusty coal which would be c irty to handle in the plant but as far as the operation of the system is concerned the dust settling chambers could be dispensed with.

It will be understood that while I have shown a complete system taking care of live different tables handling coal of five different sizes, nevertheless my system might be applied to a larger or to a smaller number of tables and under some conditions recirculation of the coal between the hood and the fan of every table and under other conditions no recirculation need be used or in other conditions only recirculation at theend of the system might be the best solution.

I claim:

1. The combination with a plurality of air cleaning tables all of which are pervious to air and impervious to solids of an air system therefor, comprising separate means for discharging air under pressure through the deck of each table, hoods overlying each table, a conduit leading from the hood of one table to the air discharging means for the next table. 7

2. The combination with a plurality of air cleaning tables all of which are pervious to air and impervious to solids of an airsystem therefor, comprising separate means for discharging air under pressure through the deck of each table, hoods overlying each table, a conduit leading from the hood of one table to the air discharging means for the next table, dust separating means interposed between the two ends of such conduit.

3. The combination with a plurality of air cleaning tables all of which are pervious to tern therefor,comprising separate, means for discharging air under pressure throughthe deck of each table, hoods overlying each t able, a conduit leading from the hood of one table to the air discharging means for the;

next table, adjustable air inlet means associ ated with eachair discharging means to permit the introduction of make up air into thesystem.

4; The combination with aplurality of air cleaning tables allof which: are pervious to air and impervious to solids of an air'system therefor, comprising separate means for dis charging air under pressure through thedeck of each table, hoods overlying each table, aconduit leading from the hood of one table to the air discharging means for the next-1 table and a recirculating conduit. leading from the hood associated with one of the tables, to its air discharging means.

5. The combination with a plurality of air. cleaning tables all ofwhich are pervious to air and impervious tosolids of an air sys-;

temtherefor, com-prising separate means i for discharglng a1r under pressure through the .ble, a conduit leading from the hood of one table to the airdischarging means for the next table and a, recirculating conduit lead-. ing from the hood associated with one of the v tables to its air discharging means and ad- I ,tables and 'means contrfolled by thei -operator justableair'intake means associated with the air discharging means to permit the introduction of make-up air to the system.

6. The combination with a plurality of air cleaning tables of an air system therefor, comprising separate means for discharging airf' under pressure through the deck of each ta: hoods overlying each table, a conduit leading from the hood of one table to the air discharging means for the next table and a ble,

' V recirculating conduit leading from the hood associatedwith oneof the tables to its air i discharging means, and means for withdraw- I ing arelative-ly small quantity of air from the hood associated with the last table in the system and separating the dust therefrom.

' The combination with a pluralityof air cleaning tables of an air I system therefor,

comprising separate 'means for discharging air underpressure through the deck ofj each table, hoods overlying each table, a conduit leading from the; hood of one'table to the air discharging means for the next. table and a v recirculating conduit leading from the hood associated with one of the tables to its air discharging means and adjustable air intake means associated with the air discharging means to permit the introduction of-make up 7 air to thesystem, and means for withdrawing a relatively small quantity of air from the hood associated with the last tablein the system and separating the dust therefrom. a

8. The combination with a'plurality of air part' of thesystem associated with each tablevtjorprovide Lfor progressively increased table 7 cleaning tables of an air system therefor 'wheremthe tables are arranged 1n seriesgji means for forc ng all under pressure through admitting make up air to that .p art of the sys for wherein thetables are arranged in series,

" mean s; for forcing' air under;pressure through ":each 1 table successively, and 1 means for recir- 'culating the through some of the tables.

I {the combination with a" plurality of vair cleaning tables arranged in series whereby th ey'm'aycpass through the system successively from-and through onejtable after another all p of which arejp'er vious'to air and impervious to solidsrof an air systemithe're'for iwh'ereinthe :tables are arranged inseries, means for forcing air eunder pressure :through' each table successively, and -means: controlled by 'the' operator :for admitting make fup air to: that l;

Mairireqi'uirements;yv a i 10.. j-Thecomb'nation'witha plurality of air cleaning tables arranged in series whereby theymay pass-through theisystem succes ,sivel-y from and through one table after j deck of each table, hoods overlying each ta -anotheiial l of which arepervious to air and =-imperviousyto solids'of anairfisystem theref forwherein the tables are arranged in series, means for forcing airaunder pressure .through each table successively, andmeans I forrecirculating theair throughjsome of the c for-iadmittingmakeupiairto that partof the, system associated with each table f to, provide -for progresssivelyincreased table air requirelments,

.11. Thel combination aipluralitywof quantity ofvafir and; separating out the dust contained therein. i

7 12. The comb'natlon with a pluralityof air air] cleaning tables of an; air system therefor, I

' v W means for forc ng-air underpressure through each-table successivelyrand means for recirand means for finally withdrawing from the Tj last table of'the system, a relativelyismall 5;-

eachfta ble successively, and means for recire a and means controlled by the operator for tern associated with eachtable to provide for ments and 'means' forv finally withdrawing from the last table of the system, a relatively s v culating the air throughsome of thetable's, f

progressively,increased table air'require-j 13. In a battery of air cleaning'tables,

means for supplying air to one of the tables comprising a blower, a discharge conduit leading therefrom to the table, a manifold adapted to supply air to the blower, a hood located above-the table, a recirculation pipe adapted to lead air from the hood to the manifold, a pipe adapted to lead spent dust laden air from another table in the battery to the manifold.

14. In a battery of air cleaning tables, means for supplying air to one of the tables comprising a blower, a discharge conduit leading therefrom to the table, a manifold adapted to supply air to the blower, a hood located above the table, a recirculation pipe adapted to lead air from the hood to the manifold, apipeadaptedto leadspent dustladen air from another table in the battery to the manifold, the manifold having a make up inlet opening and a'valve controlling it to provide make up air whereby the operator may control the total amount of air fed to the table.

15. The combination with a plurality of air cleaning tables of an air system therefor wherein the tables are arranged in series, means for forcing air under pressure through each table successively and means associated with one of the tables in the system for recirculating part of the air therethrough', means for removing dust from the air as it goes from one table of the system to the next.

16. In a coal cleaning system, a dust arrester, a plurality of air cleaning tables having different air requirements and means for forcing air therethrough and withdrawing spent dust laden air from that part of the system where the air requirement is greatest and to supply cleaned air to that part of the system where the air requirement is least, the air forcing and withdrawing means being so arranged that dust laden air from the tables of less requirement is supplied to tables of greater requirement so that only the amount of air discharged from the zone of greatest air requirement passes through the dust arrester.

Signed at Chicago, county of Cook and State of Illinois, this 28 day of April, 1928.

GEORGE LYMAN ARMS.