US1233606A - Peat gasification. - Google Patents

Description

T. RIGBY. PEAT GASIFICATION. APPLICATION FILED Ausm. 1914.

19233696.; v Patented July 17, 1917.

f 1,233,6ll6.

THOMAS RIGBY, OF DUMFRIES, SCOTLAND, ASSIGNOR TO W ETCARBCNIZING LIMITED, 0F LONDON, ENGLAND.

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Speciication of Letters Patent.

lPatented July 17, 191?,

i Application led August 11, 1914. Serial No. 856,254.

To all 'whom it may concerne: v

Be it known that I, THOMAS RIGBY, a subject of the King of Great Britain and Ireland, and residing at 61 Loreburnstreet, Dumfries, Scotland, have invented certain new and useful improvements in Peat Gaeication, of which the following is a specification.

This invention relates to the gasification of peat with recovery of by-products,and has particular reference to the utilization of peatwhich has'had its water rendered more freely eXpressible by heat treatment, such as Wetcarbonizationlnv the gasification of fuels such as coal in by-product recovery gas plant, for instance of the Mond type, provided a suiflcient proportion of steam is introduced into the producer no difficulty is` experienced in securing a gas of steady caloriiic value and in maintaining; efficient by-product recovery despite considerable changes in the condition of the fuel fed into the producer, and especially as regards changes in moistness such as occur in materials like colliery refuse. Y

Now I have ascertained that different conditions present themselves in the gasication of peat, and that to secure constancy in gas composition and maintain efficient byproduct recovery the fuel entering the producer must be maintained as far as possible in the same condition, and that in particular a steady moisture content must as far as possible be maintained. This difference in behavior between coal and peat must presumably be attributed to the difference in the volatile matters present in the respective fuels. 1

This invention consists in a method of gasifying (with by-product recovery) peat fuel in different conditions,,andespecially as regards moisture content, in which the average condition of the fuel entering the gas producer is maintained, as far as convenient, constant by controlled proportionate admiXture of the different grades of the fuel. Y s

This invention consists more particularly in a method of thekind described for gasi fying mixtures of briqueted peat and 4press cakes of peat as are described in U. S. patent application Serial No. 712,745, filed 1st August 1912, according to which the admixture is effected by automatically measuringV out, preferably in a continuous manner, for admiXture, the two forms of the fuel in predetermined proportion variable with the `respective moisture content and thereafter tion into effect, while Fig. 2 shows to an enlarged scale the outlet end of the bunkers shown in Fig. l.

ln applying the invention to the gasification of admixtures'of press cakes of wet carbonized peat having a water content of from 65 to 70% with briquets of the same material having a water content of about 5%, the press cakes are taken from the filter presses by a conveyer a to a rotary screen b, through :which the fine material passes by way of a duct c to disintegrators 0l to be thereafter briqueted. The larger lumps of the press cake passing over the screen b fall into a bunker e, which is preferably provided with a duct f connected with the duct c in'order that any excess of material not requiredin the'producer shall be passed to the disintegrators al. At its outlet end the bunker e is provided, as shown to an enlarged scale in Fig. 2, with a sliding plate g which, by means of a tightening handle 7L,

lcan be fixed at any desired height above the `by gearing n and beltin'g o from an electricv motor p. Y

The jig conveyer y' empties itself into a `hopper g and preferably intoa second rotary screen r, in order lthat any dust produced during the measuring operations shall not pass to the producer where it might be obiectionable, but be disintegrated, and therea er briqueted. The remaining larger lumps of material are taken by a conveyer s, and delivered to a hopper i where @they meet the other constituent, in this case` the peat briquets, whereupon admixtureis effected on al conveyer `by which l the charge is carried forward to the producers or store supplying the same.

The briquets to be admixed with -t-he press cakes have usually been obtained from wetcarbonized peat which, after f having been filter pressed, disintegrated, further dried, as for example by iiue gases to a water content of about 5%, has been briqueted. Such briquets are lifted by a-.conveyer u into a bunker o feeding a jig conveyer likewise driven by an .electric motor w, through belting y, gearing e, and a crank and connecting rod 1 and 2. `The bunker o is also provided with a plate g, arranged in the manner illustrated in Fig. 2 for the purpose ofregulatingthe quantity of material delivered during .each stroke of the jig conveyor. As before, the measured out material is before'admixture preferably screened a rotary screen 3, through which the fine material passes to disintegrators 4, to be thereafter briqueted; while the larger lumps of material pass over to the hopper i where, as already mentioned, they meet the press cakes from the bunker 4c and are carried forward by the conveyers t tothe producer or store.

For the purpose of enabling a constant ratio4v to be maintainedv betweeny the respective speeds of the two jig conveyers y' and w, themotors p and w driving the same are suitably interconnected, as for instance by arrangingsuch motors in parallel on the same mains 5, and rigidly connectingl the handles 6 and -7 of their respective starters 8 and 9 by a bar or the like 10.

In using such an apparatus, a producer charge. of the desired average moisture content is obtained by adjusting the plate g of the bunkers e and o respectively, atV such a height above the table of the j ig-conveyers j: andv 'w that the depth of the material delivered thereon gives the necessary proportion of press cakes to briquets. If the speeds o-f the jig conveyer 7'y and fw remain constant, the producer will be charged with fuel at a constant rate, and the latter can thus be varied without in any way altering the average moisture content of the charge, by sim-ply varying the speed of the two jig conveyors, while maintaining a constant ratio between such. speeds, as by operating the bar V10 by which the starter handles 6 and l'are connected.

1f preferred, the two jig conveyers. may be interconnected mechanically, and driven by means other than electric motors, while in addition, any preferable. form of quick return mechanism may be employed for reciprocatingl the tables of the jig conveyers.

it willl be furtherrunderstood that the above, arrangements are onlydescribed by way' of example, as being suitable: where the producer charge isa mixture of press cakes and briquets of wetcarbonized peajey Corr sequently the apparatus employed for carrying the invention into effect may be considerably modified to suit the particular nature o-f the peat, or of the mixture supplied ,to the producer, provided the average moisture content of the charge can be conveniently controlled within predetermined limits.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is :-l

1. Method of forming a peat fuel mixture for gas producers consisting in feeding forward a stream of relatively moist peat fragments, feeding forward a second stream of such substance in a relatively dry condition and adjusting the relative proportions of said two streams so as to produce when combined a feed of a desired uniform water coutent.

2. Method of forming a peat fuel mixture for gas producers consisting in forming a gaged moving stream or feed of peat fragments in a relatively moist condition, forming a second feed of relatively dry peat substance having a velocity which is constantly related to. that of the first feed and a volume adapted on admixture therewith to produce material of a desired water content and mingling said two feeds for the purpose set forth.

8. Method of forming a peat fuel mixture for gas producers consisting in forming a @aged moving stream or feed of peat presscaires, yforming a second feed of peat briquets having a velocity which is constantly related to that of the first feed and a volume adapted on admiXture therewith to produce material of a desired water content, and mingling said two feeds for the purpose set forth.

4. Method of forming a peat fuel mixture for gas producers consisting in forming a gaged moving stream or feed of peat presscakes of about 68 per cent. water content, forming a second feed of peat briquets o1 5 per cent. water content adapted on admixture with said first feed to produce material of a desired water content, and mingling said two feeds for the purpose set for'th.

5. A method of forming a peat fuel charging-mixture for gas producers, consisting in forming a gaged moving stream or feed of peat fragments in a relatively moist condition, forming a second feed of relatively dry peat substance having a velocity which is constantly related to 'that of the first feed and a volume adapted on admixture therewith to produce material of a desired water content, mingling said two feeds` and regulating their constantly related velocities to supply any required volume of fuel having a uniform distribution of moisture throughout its mass.

1,233,606 ein;

6. A method of forming a peat fuel charging miXture for gas producers, consisting in forming a gaged moving stream or feed of peat press-cakes of about 68 per cen't. water content, forming a second feed of peat briquets of about 5 per cent. water content having a velocity which is constantly related to that of the first feed and a volume adapted on admixture therewith to produce material of a desired water content, mingling said two feeds and regulating their constantly related velocities to supply any required volume of fuel having a uniform distribution of moisture throughout its mass.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

T. RIGBY.

Witnesses:

JAMES M. BURKE, HENRY DUNwoRTH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C.

It is hereby oertied that in Letters Patent No. 1,233,606, granted July 17 1917,

upon the application of Thomas Rigby, of Dumfries, Scotland, for an improvement in Peat Gasication, an error appears in the printed specification requiringV correction as follows: Page 2, strike out lines 77, 86, 97, and 107, claims 1, 2, 3,

and 4, and insert the Words A method offomfing a peat fuel charging mixture; and

that the said Letters Patent should be read With this correction therein that the same may conform to the record of the case in the Patent Ooe.

Signed and sealed this 4th day of September, A. D., 1917.

i R. F. WHITEHEAD,

[SEAL] .Acting Commissioner of Patents. C1.

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