Steam, Its Generation and Use

by Babcock & Wilcox Company

[Pg 176]

The net air required for combustion of one cubic foot of the gas will be,

CO	=	0.0095	×	2.39	=	0.02
C2H4	=	0.0066	×	14.33	=	0.09
C2H6	=	0.0355	×	16.74	=	0.59
CH4	=	0.7215	×	9.57	=	6.90
H	=	0.2195	×	2.41	=	0.53
–––––––
Total net air per cubic foot					=	8.13

Proximate Analysis—The proximate analysis of a fuel gives its proportions by weight of fixed carbon, volatile combustible matter, moisture and ash. A method of making such an analysis which has been found to give eminently satisfactory results is described below.

From the coal sample obtained on the boiler trial, an average sample of approximately 40 grams is broken up and weighed. A good means of reducing such a sample is passing it through an ordinary coffee mill. This sample should be placed in a double-walled air bath, which should be kept at an approximately constant temperature of 105 degrees centigrade, the sample being weighed at intervals until a minimum is reached. The percentage of moisture can be calculated from the loss in such a drying.

For the determination of the remainder of the analysis, and the heating value of the fuel, a portion of this dried sample should be thoroughly pulverized, and if it is to be kept, should be placed in an air-tight receptacle. One gram of the pulverized sample should be weighed into a porcelain crucible equipped with a well fitting lid. This crucible should be supported on a platinum triangle and heated for seven minutes over the full flame of a Bunsen burner. At the end of such time the sample should be placed in a desiccator containing calcium chloride, and when cooled should be weighed. From the loss the percentage of volatile combustible matter may be readily calculated.

The same sample from which the volatile matter has been driven should be used in the determination of the percentage of ash. This percentage is obtained by burning the fixed carbon over a Bunsen burner or in a muffle furnace. The burning should be kept up until a constant weight is secured, and it may be assisted by stirring with a platinum rod. The weight of the residue determines the percentage of ash, and the percentage of fixed carbon is easily calculated from the loss during the determination of ash after the volatile matter has been driven off.

Proximate analyses may be made and reported on a moist or dry basis. The dry basis is that ordinarily accepted, and this is the basis adopted throughout this book. The method of converting from a moist to a dry basis is the same as described in the case of an ultimate analysis. A proximate analysis is easily made, gives information as to the general characteristics of a fuel and of its relative heating value.

[Table 38] gives the proximate analysis and calorific value of a number of representative coals found in the United States.
[Pg 177]

[TABLE 38] APPROXIMATE COMPOSITION AND CALORIFIC VALUE OF CERTAIN TYPICAL AMERICAN COALS State County Field, Bed or Vein Mine Size Proximate Analysis (Dry Coal) B. t. u. Per Pound Dry Coal Authority Moisture Volatile Matter Fixed Carbon Ash ANTHRACITES Pa. Carbon Lehigh Beaver Meadow 1.50 2.41 90.30 7.29 Gale Pa. Dauphin Schuylkill Buckwheat 2.15 12.88 78.23 8.89 13137 Whitham Pa. Lackawanna Wyoming Belleview No. 2 Buck. 8.29 7.81 77.19 15.00 12341 Sadtler Pa. Lackawanna Wyoming Johnson Culm. 13.90 11.16 65.96 22.88 10591 B. & W. Co. Pa. Luzerne Wyoming Pittston No. 2 Buck. 3.66 4.40 78.96 16.64 12865 B. & W. Co. Pa. Luzerne Wyoming Mammoth Large 4.00 3.44 90.59 5.97 13720 Carpenter Pa. Luzerne Wyoming Exeter Rice 0.25 8.18 79.61 12.21 12400 B. & W. Co. Pa. Northumberland Schuylkill Treverton 0.84 6.73 86.39 6.88 Isherwood Pa. Schuylkill Schuylkill Buck Mountain 3.17 92.41 4.42 14220 Carpenter Pa. Schuylkill York Farm Buckwheat 0.81 5.51 75.90 18.59 11430 Pa. Victoria Buckwheat 4.30 0.55 86.73 12.72 12642 B. & W. Co. Pa. Carbon Lehigh Lehigh & Wilkes C. Co. Buck. & Pea 1.57 6.27 66.53 27.20 12848 B. & W. Co. Pa. Carbon Lehigh Buckwheat 5.00 81.00 14.00 11800 Carpenter Pa. Lackawanna Del. & Hud. Co. No. 1 Buck. 6.20 11.60 12100 Denton SEMI-ANTHRACITES Pa. Lycoming Loyalsock 1.30 8.72 84.44 6.84 Pa. Sullivan Lopez 5.48 7.53 81.00 11.47 13547 B. & W. Co. Pa. Sullivan Bernice 1.29 8.21 84.43 7.36 SEMI-BITUMINOUS Md. Alleghany Big Vein, George's Crk. 3.50 21.33 72.47 6.20 14682 B. & W. Co. Md. Alleghany George's Creek 3.63 16.27 76.93 6.80 14695 B. & W. Co. Md. Alleghany George's Creek 2.28 19.43 77.44 6.13 14793 B. & W. Co. Md. Alleghany George's Creek Ocean No. 7 Mine run 1.13 14451 B. & W. Co. Md. Alleghany Cumberland 1.50 17.26 76.65 6.09 14700 Md. Garrett Washington No. 3 Mine run 2.33 14.38 74.93 10.49 14033 U. S. Geo. S.[37] Pa. Bradford Long Valley 1.55 20.33 68.38 11.29 12965 Pa. Tioga Antrim 2.19 18.43 71.87 9.70 13500 Pa. Cambria "B" or Miller Soriman Shaft C. Co. 3.40 20.70 71.84 7.46 14484 N. Y. Ed. Co. Pa. Cambria "B" or Miller Henrietta 1.23 18.37 75.28 6.45 14770 So. Eng. Co. Pa. Cambria "B" or Miller Penker 3.64 21.34 70.48 8.18 14401 B. & W. Co. Pa. Cambria "B" or Miller Lancashire 4.38 21.20 70.27 8.53 14453 B. & W. Co. Pa. Cambria Lower Kittanning Penn. C. & C. Co. No. 3 Mine run 3.51 17.43 75.69 6.88 14279 U. S. Geo. S. Pa. Cambria Upper Kittanning Valley Mine run 3.40 14.89 75.03 10.08 14152 B. & W. Co. Pa. Clearfield Lower Kittanning Eureka Mine run 5.90 16.71 77.22 6.07 14843 U. S. Geo. S. Pa. Clearfield Ghem Mine run 3.43 17.53 69.67 12.80 13744 B. & W. Co. Pa. Clearfield Osceola 1.24 25.43 68.56 6.01 13589 B. & W. Co. Pa. Clearfield Reynoldsville 2.91 21.55 69.03 9.42 14685 B. & W. Co. Pa. Clearfield Atlantic-Clearfield Mine run 1.55 23.36 71.15 5.94 13963 Whitham Pa. Huntington Barnet & Fulton Carbon Mine run 4.50 18.34 73.06 8.60 13770 B. & W. Co. Pa. Huntington Rock Hill Mine run 5.91 17.58 73.44 8.99 14105 B. & W. Co. Pa. Somerset Lower Kittanning Kimmelton Mine run 3.09 17.84 70.47 11.69 13424 U. S. Geo. S. Pa. Somerset "C" Prime Vein Jenner Mine run 9.37 16.47 75.76 7.77 14507 P. R. R. W. Va. Fayette New River Rush Run Mine run 2.14 22.87 71.56 5.57 14959 U. S. Geo. S.[Pg 178] W. Va. Fayette New River Loup Creek 0.55 19.36 78.48 2.16 14975 Hill W. Va. Fayette New River Slack 6.66 20.94 73.16 5.90 14412 B. & W. Co. W. Va. Fayette New River Mine run 2.16 17.82 75.66 6.52 14786 B. & W. Co. W. Va. Fayette New River Rush Run Mine run 0.94 22.16 75.85 1.99 15007 B. & W. Co. W. Va. McDowell Pocahontas No. 3 Zenith Mine run 4.85 17.14 76.54 6.32 14480 U. S. Geo. S. W. Va. McDowell Tug River Big Sandy Mine run 1.58 18.55 76.44 4.91 15170 U. S. Geo. S. W. Va. Mercer Pocahontas Mora Lump 1.74 18.55 75.15 6.30 15015 U. S. Geo. S. W. Va. Mineral Elk Garden 2.10 15.70 75.40 8.90 14195 B. & W. Co. W. Va. McDowell Pocahontas Flat Top Mine run 0.52 24.02 74.59 1.39 14490 B. & W. Co. W. Va. McDowell Pocahontas Flat Top Slack 3.24 15.33 77.60 7.07 14653 B. & W. Co. W. Va. McDowell Pocahontas Flat Top Lump 3.63 16.03 78.04 5.93 14956 B. & W. Co. State County Field, Bed or Vein Mine Size Proximate Analysis (Dry Coal) B. t. u. Per Pound Dry Coal Authority Moisture Volatile Matter Fixed Carbon Ash BITUMINOUS Ala. Bibb Cahaba Hill Creek Mine run 6.19 28.58 55.60 15.82 12576 B. & W. Co. Ala. Jefferson Pratt Pratt No. 13 4.29 25.78 67.68 6.54 14482 B. & W. Co. Ala. Jefferson Pratt Warner Mine run 2.51 27.80 61.50 10.70 13628 U. S. Geo. S. Ala. Jefferson Coalburg Mine run 0.94 31.34 65.65 3.01 14513 B. & W. Co. Ala. Walker Horse Creek Ivy C. & I. Co. No. 8 Nut 2.56 31.82 53.89 14.29 12937 U. S. Geo. S. Ala. Walker Jagger Galloway C. Co. No. 5 Mine run 4.83 34.65 51.12 14.03 12976 U. S. Geo. S. Ark. Franklin Denning Western No. 4 Nut 2.22 12.83 75.35 11.82 U. S. Geo. S. Ark. Sebastian Jenny Lind Mine No. 12 Lump 1.07 17.04 74.45 8.51 14252 U. S. Geo. S. Ark. Sebastian Huntington Cherokee Mine run 0.97 19.87 70.30 9.83 14159 U. S. Geo. S. Col. Boulder South Platte Lafayette Mine run 19.48 38.80 49.00 12.20 11939 B. & W. Co. Col. Boulder Laramie Simson Mine run 19.78 44.69 48.62 6.69 12577 U. S. Geo. S. Col. Fremont Canon City Chandler Nut and Slack 9.37 38.10 51.75 10.15 11850 B. & W. Co. Col. Las Animas Trinidad Hastings Nut 2.15 31.07 53.40 15.53 12547 B. & W. Co. Col. Las Animas Trinidad Moreley Slack 1.88 28.47 55.58 15.95 12703 B. & W. Co. Col. Routt Yampa Oak Creek 6.67 42.91 55.64 1.45 Hill Ill. Christian Pana Penwell Col. Lump 8.05 43.67 49.97 6.36 10900 Jones Ill. Franklin No. 6 Benton Egg 8.31 34.52 54.05 11.43 11727 U. S. Geo. S. Ill. Franklin Big Muddy Zeigler ¾ inch 13.28 31.97 57.37 10.66 12857 U. S. Geo. S. Ill. Jackson Big Muddy 4.85 31.55 62.19 6.26 11466 Breckenridge Ill. La Salle Streator 8.40 41.76 51.42 6.82 11727 Breckenridge Ill. La Salle Streator Marseilles Mine run 12.98 43.73 49.13 7.14 10899 B. & W. Co. Ill. Macoupin Nilwood Mine No. 2 Screenings 13.34 34.75 44.55 20.70 10781 B. & W. Co. Ill. Macoupin Mt. Olive Mine No. 2 Mine run 13.54 41.28 46.30 12.42 10807 U. S. Geo. S. Ill. Madison Belleville Donk Bros. Lump 13.47 38.69 48.07 13.24 12427 U. S. Geo. S. Ill. Madison Glen Carbon Mine run 9.78 38.18 51.52 10.30 11672 Bryan Ill. Marion Odin Lump 6.20 42.91 49.06 8.03 11880 Breckenridge Ill. Mercer Gilchrist Screenings 8.50 36.17 41.64 22.19 10497 Breckenridge Ill. Montgomery Pana or No. 5 Coffeen Mine run 11.93 34.05 49.85 16.10 10303 U. S. Geo. S. Ill. Peoria No. 5 Empire 17.64 31.91 46.17 21.92 10705 B. & W. Co. Ill. Perry Du Quoin Number 1 Screenings 9.81 33.67 48.36 17.97 11229 B. & W. Co. Ill. Perry Du Quoin Willis Mine run 7.22 33.06 53.97 12.97 11352 U. S. Geo. S.[Pg 179] Ill. Sangamon Pawnee Slack 4.81 41.53 39.62 18.85 10220 Jones Ill. St. Glair Standard Nigger Hollow Mine run 14.39 32.90 44.84 22.26 11059 B. & W. Co. Ill. St. Clair Standard Maryville Mine run 15.71 38.10 41.10 20.80 10999 B. & W. Co. Ill. Williamson Big Muddy Daws Mine run 8.17 34.33 52.50 13.17 12643 U. S. Geo. S. Ill. Williamson Carterville or No. 7 Carterville 4.66 35.65 56.86 7.49 12286 Univ. of Ill. Ill. Williamson Carterville or No. 7 Burr Nut, Pea and Slack 11.91 33.70 55.90 10.40 12932 B. & W. Co. Ind. Brazil Brazil Gartside Block 2.83 40.03 51.97 8.00 13375 Stillman Ind. Clay Louise Block 0.83 39.70 52.28 8.02 13248 Jones Ind. Green Island City Mine run 6.17 35.42 53.55 11.03 11916 Dearborn Ind. Knox Vein No. 5 Tecumseh Mine run 10.73 35.75 54.46 9.79 12911 B. & W. Co. Ind. Parke Vein No. 6 Parke Coal Co. Lump 10.72 44.02 46.33 9.65 11767 U. S. Geo. S. Ind. Sullivan Sullivan No. 6 Mildred Washed 16.59 42.17 48.44 9.59 13377 U. S. Geo. S. Ind. Vigo Number 6 Fontanet Mine run 2.28 34.95 50.50 14.55 11920 Dearborn State County Field, Bed or Vein Mine Size Proximate Analysis (Dry Coal) B. t. u. Per Pound Dry Coal Authority Moisture Volatile Matter Fixed Carbon Ash Ind. Vigo Number 7 Red Bird Mine run 11.62 41.17 46.76 12.07 12740 U. S. Geo. S. Iowa Appanoose Mystic Mine No. 3 Lump 13.48 39.40 43.09 17.51 11678 U. S. Geo. S. Iowa Lucas Lucas Inland No. 1 Mine run 16.01 37.82 46.24 15.94 11963 U. S. Geo. S. Iowa Marion Big Vein Liberty No. 5 Mine run 14.88 41.53 39.63 18.84 11443 U. S. Geo. S. Iowa Polk Third Seam Altoona No. 4 Lump 12.44 41.27 40.86 17.87 11671 U. S. Geo. S. Iowa Wapello Wapello Lump 8.69 36.23 43.68 20.09 11443 U. S. Geo. S. Kan. Cherokee Weir Pittsburgh Southwestern Dev. Co. Lump 4.31 33.88 53.67 12.45 13144 U. S. Geo. S. Kan. Cherokee Cherokee Screenings 6.16 35.56 46.90 17.54 10175 Jones Kan. Cherokee Cherokee Lump 1.81 34.77 52.77 12.46 12557 Jones Kan. Linn Boicourt Lump 4.74 36.59 47.07 16.34 10392 Jones Ky. Bell Straight Creek Str. Ck. C. & C. Co. Mine run 2.89 36.67 57.24 6.09 14362 U. S. Geo. S. Ky. Hopkins Bed No. 9 Earlington Lump 6.89 40.30 55.16 4.54 13381 St. Col. Ky. Ky. Hopkins Bed No. 9 Barnsley Mine run 7.92 40.53 48.70 10.77 13036 U. S. Geo. S. Ky. Hopkins Vein No. 14 Nebo Pea and Slack 8.02 31.91 54.02 14.07 12448 B. & W. Co. Ky. Johnson Vein No. 1 Miller's Creek Mine run 5.12 38.46 58.63 2.91 13743 U. S. Geo. S. Ky. Mulenburg Bed No. 9 Pierce Pea and Slack 9.22 33.94 52.18 13.88 12229 B. & W. Co. Ky. Pulaski Greensburg 2.80 26.54 63.58 9.88 14095 N. Y. Ed. Co. Ky. Webster Bed No. 9 Pea and Slack 7.30 31.08 60.72 8.20 13600 B. & W. Co. Ky. Whitley Jellico Nut and Slack 3.82 31.82 58.78 9.40 13175 B. & W. Co. Mo. Adair Danforth Mine run 9.00 30.55 46.26 23.19 9889 B. & W. Co. Mo. Bates Rich Hill New Home Mine run 7.28 37.62 43.83 18.55 12109 U. S. Geo. S. Mo. Clay Lexington Mo. City Coal Co. 12.45 39.39 48.47 12.14 12875 Univ. of Mo. Mo. Lafayette Waverly Buckthorn 8.58 41.78 45.99 12.23 12735 Univ. of Mo. Mo. Lafayette Waverly Higbee 10.84 31.72 55.29 12.99 12500 Univ. of Mo. Mo. Linn Bevier Marceline 9.45 36.72 52.20 11.08 13180 Univ. of Mo. Mo. Macon Bevier Northwest Coal Co. 13.09 37.83 42.95 19.22 11500 U. S. Geo. S. Mo. Morgan Morgan Co. Morgan Co. Coal Co. Mine run 12.24 45.69 47.98 6.33 14197 U. S. Geo. S. Mo. Putnam Mendotta Mendotta No. 8 20.78 39.36 50.00 10.64 12602 U. S. Geo. S. N.Mex. McKinley Gallup Gibson Pea and Slack 12.17 36.31 51.17 12.52 12126 B. & W. Co. Ohio Athens Hocking Valley Sunday Creek Slack 12.16 34.64 53.10 12.26 12214 [Pg 180] Ohio Belmont Pittsburgh No. 8 Neff Coal Co. Mine run 5.31 38.78 52.22 9.00 12843 U. S. Geo. S. Ohio Columbiana Middle Kittanning Palestine 2.15 37.57 51.80 10.63 13370 Lord & Haas Ohio Coshocton Middle Kittanning Morgan Run Mine run 41.76 45.24 13.00 13239 B. & W. Co. Ohio Guernsey Vein No. 7 Little Kate 6.19 33.02 59.96 7.02 13634 B. & W. Co. Ohio Hocking Hocking Valley Lump 6.45 39.12 50.08 10.80 12700 Lord & Haas Ohio Hocking Hocking Valley 2.60 40.80 47.60 11.60 12175 Jones Ohio Jackson Brookville Superior Coal Co. Mine run 7.59 38.45 43.99 17.56 11704 U. S. Geo. S. Ohio Jackson Lower Kittanning Superior Coal Co. Mine run 8.99 41.43 50.06 8.51 13113 U. S. Geo. S. Ohio Jackson Quakertown Wellston 3.38 35.26 54.18 7.56 12506 Hill Ohio Jefferson Pittsburgh or No. 8 Crow Hollow ¾ inch 4.04 40.08 52.27 9.65 13374 U. S. Geo. S. Ohio Jefferson Pittsburgh or No. 8 Rush Run No. 1 ¾ inch 4.74 36.08 54.81 9.11 13532 U. S. Geo. S. Ohio Perry Hocking Congo 6 41 38.33 46.71 14.96 12284 B. & W. Co. Ohio Stark Massillon Slack 6.67 40.02 46.46 13.52 11860 B. & W. Co. Ohio Vinton Brookville or No. 4 Clarion Nut and Slack 2.47 42.38 50.39 6.23 13421 U. S. Geo. S. State County Field, Bed or Vein Mine Size Proximate Analysis (Dry Coal) B. t. u. Per Pound Dry Coal Authority Moisture Volatile Matter Fixed Carbon Ash Okla. Choctaw McAlester Edwards No. 1 Mine run 4.79 39.18 49.97 10.85 13005 U. S. Geo. S. Okla. Choctaw McAlester Adamson Slack 4.72 28.54 58.17 13.29 12105 B. & W. Co. Okla. Creek Henrietta Lump and Slack 7.65 36.77 50.14 13.09 12834 U. S. Geo. S. Pa. Allegheny Pittsburgh 3rd Pool Slack 1.77 32.06 57.11 10.83 13205 Carpenter Pa. Allegheny Monongahela Turtle Creek 1.75 36.85 53.94 9.21 13480 Lord & Haas Pa. Allegheny Pittsburgh Bertha ¾ inch 2.61 35.86 57.81 6.33 13997 U. S. Geo. S. Pa. Cambria Beach Creek Slack 3.01 32.87 55.86 11.27 13755 B. & W. Co. Pa. Cambria Miller Lincoln Mine run 5.39 30.83 61.05 8.12 13600 B. & W. Co. Pa. Clarion Lower Freeport 0.54 35.93 57.66 6.41 13547 Pa. Fayette Connellsville Slack 1.85 28.73 63.22 7.95 13775 Whitham Pa. Greene Youghiogheny Lump 1.25 32.60 54.70 12.70 13100 B. & W. Co. Pa. Greene Westmoreland Screenings 11.12 31.67 55.61 12.72 13100 P. R. R. Pa. Indiana Iselin Mine run 2.70 29.33 63.56 7.11 14220 B. & W. Co. Pa. Jefferson Punxsutawney Mine run 3.38 29.33 64.93 5.73 14781 B. & W. Co. Pa. Lawrence Middle Kittanning 0.70 37.06 56.24 6.70 13840 Lord & Haas Pa. Mercer Taylor 4.18 32.19 55.55 12.26 12820 B. & W. Co. Pa. Washington Pittsburgh Ellsworth 2.46 35.35 58.46 6.19 14013 U. S. Geo. S. Pa. Washington Youghiogheny Anderson ¾ inch 1.00 39.29 54.80 5.91 13729 Jones Pa. Westmoreland Pittsburgh Scott Haven Lump 4.06 32.91 59.78 7.31 13934 B. & W. Co. Tenn. Campbell Jellico 1.80 37.76 62.12 1.12 13846 U. S. Navy Tenn. Claiborne Mingo 4.40 34.31 59.22 6.47 U. S. Geo. S. Tenn. Marion Etna 3.16 32.98 56.59 10.43 Tenn. Morgan Brushy Mt. 1.77 33.46 54.73 11.87 13824 B. & W. Co. Tenn. Scott Glen Mary No. 4 Glen Mary 1.53 40.80 56.78 2.42 14625 Ky. State Col. Tex. Maverick Eagle Pass 5.42 33.73 44.89 21.38 10945 B. & W. Co. Tex. Paolo Pinto Thurber Mine run 1.90 36.01 49.09 14.90 12760 B. & W. Co. Tex. Paolo Pinto Strawn Mine run 4.19 35.40 52.98 11.62 13202 B. & W. Co. Va. Henrico Gayton 0.82 17.14 74.92 7.94 14363 B. & W. Co. Va. Lee Darby Darby 1½ inch 4.35 38.46 56.91 4.63 13939 U. S. Geo. S.[Pg 181] Va. Lee McConnel Wilson Mine run 3.35 36.35 57.88 5.77 13931 U. S. Geo. S. Va. Wise Upper Banner Coburn 3½ inch 3.05 32.65 62.73 4.62 14470 U. S. Geo. S. Va. Rockingham Clover Hill 31.77 57.98 10.25 13103 Va. Russel Clinchfield 2.00 35.72 56.12 8.16 14200 Va. Monongahela Bernmont 32.00 59.90 8.10 13424 Carpenter W. Va. Harrison Pittsburgh Ocean Mine run 2.47 39.35 52.78 7.87 14202 U. S. Geo. S. W. Va. Harrison Girard Nut, Pea and Slack 36.66 57.49 5.85 14548 B. & W. Co. W. Va. Kanawha Winifrede Winifrede 1.05 32.74 64.38 2.88 14111 Hill W. Va. Kanawha Keystone Keystone Mine run 2.21 33.29 58.61 8.10 14202 U. S. Geo. S. W. Va. Logan Island Creek Nut and Slack 1.12 38.61 55.91 5.48 14273 Hill W. Va. Marion Fairmont Kingmont 1.90 35.31 57.34 7.35 14198 U. S. Geo. S. W. Va. Mingo Thacker Maritime 0.68 31.89 63.48 4.63 14126 Hill W. Va. Mingo Glen Alum Glen Alum Mine run 3.02 33.81 59.45 6.74 14414 U. S. Geo. S. W. Va. Preston Bakerstown 4.14 29.09 63.50 7.41 14546 U. S. Geo. S. W. Va. Putnam Pittsburgh Black Betsy Bug dust 7.41 32.84 53.96 13.20 12568 B. & W. Co. W. Va. Randolph Upper Freeport Coalton Lump and Nut 2.11 29.57 59.93 10.50 13854 U. S. Geo. S. State County Field, Bed or Vein Mine Size Proximate Analysis (Dry Coal) B. t. u. Per Pound Dry Coal Authority Moisture Volatile Matter Fixed Carbon Ash LIGNITES AND LIGNITIC COALS Col. Boulder Rex 16.05 42.12 47.97 9.91 10678 B. & W. Co. Col. El Paso Curtis 23.25 42.11 49.38 8.51 11090 B. & W. Co. Col. El Paso Pike View 23.77 48.70 41.47 9.83 10629 B. & W. Co. Col. Gunnison South Platte Mt. Carbon 20.38 46.38 47.50 6.12 Col. Las Animas Acme 16.74 47.90 44.60 7.50 Col. Sc. of M. Col. Lehigh 18.30 45.29 44.67 10.04 N. Dak. McLean Eckland Mine run 29.65 45.56 47.05 7.39 10553 Lord N. Dak. McLean Wilton Lump 35.96 49.84 38.05 12.11 11036 U. S. Geo. S. N. Dak. McLean Casino 29.65 46.56 38.70 14.74 Lord N. Dak. Stark Lehigh Lehigh Mine run 35.84 43.84 39.59 16.57 10121 U. S. Geo. S. N. Dak. William Williston Mine run 41.76 39.37 48.09 12.54 10121 B. & W. Co. N. Dak. William Williston Mine run 42.74 40.83 47.79 11.38 10271 B. & W. Co. Tex. Bastrop Bastrop Glenham 32.77 42.76 36.88 20.36 8958 B. & W. Co. Tex. Houston Crockett 23.27 40.95 38.37 20.68 10886 U. S. Geo. S. Tex. Houston Houston C. & C. Co. 31.48 46.93 34.40 18.87 10176 B. & W. Co. Tex. Milam Rockdale Worley 32.48 43.04 41.14 15.82 10021 B. & W. Co. Tex. Robertson Calvert Coaling No. 1 32.01 43.70 43.08 13.22 10753 B. & W. Co. Tex. Wood Hoyt Consumer's Lig. Co. 33.98 46.97 41.40 11.63 10600 U. S. Geo. S. Tex. Wood Hoyt 30.25 43.27 41.46 15.27 10597 Wash. King Black Diamond 3.71 48.72 46.56 4.72 Gale Wyo. Carbon Hanna Mine run 6.44 51.32 43.00 5.68 11607 B. & W. Co. Wyo. Crook Black Hills Stilwell Coal Co. 19.08 45.21 46.42 8.37 12641 U. S. Geo. S. Wyo. Sheridan Sheridan Monarch 21.18 51.87 40.43 7.70 12316 U. S. Geo. S. Wyo. Sweetwater Rock Spring Screenings 7.70 38.57 56.99 4.44 12534 B. & W. Co. Wyo. Uinta Adaville Lazeart 19.15 45.50 48.11 6.39 9868 U. S. Geo. S. [Pg 182]