Question

Methane gas is burned with 30 percent excess air. This fuel enters a steady- flow combustor at 0.8 atm and 25oC and is mixed with the air. The products of combustion leave this reactor at 0.8 atm and 1600 K. Determine the equilibrium composition of the products of combustion and the amount of heat released by this combustion in kJ/kmol methane. Use data from the tables CH 25°C CO2, H3O chamber NO. O2 N2 1600 K 30% excess air 25°C The amount of carbon dioxide (CO2) produced is kmol. The amount of water (H20) produced is kmol The amount of nitrous oxide (NO) produced iskmol. K09275 69671 02897 50177 34132 77365 13270 9477 23445 56678 899 in 22222 22222 222 , B 4 19991 59520 90259 52001 35834 33571 62988 8 1 19754 8136 9 25814 70369 25814 7 . , , , 90000 1. i i 2 2 23334 44455 56667 7 78150 64224 60529 88926 17312 937 04825 93715 82604 82604 82604 82604 99 90011 12233 34455 22222 22222 22222 23333 33333 33333 万k22222 22 0 K 6411 99610 80864 51207 31005 47725 32959 50520| 0655 4792 ,7 9 2 4 4 ,7 9 2 4 79257 02580 36814 69247 03581 o 5 8 1 4 71614-62 964 22 1 2 4 6938 92 69269936990 6 360 36037 , 223 33444 55566 67778 88990 n 7, 778 8890 9, 9 0 0 0 1: .3 3 3 3 3.3 333 44444 44444 55555 55555 4 21912 ,4 6 803 58036 925 9 2 69360 .4 82 uk| 5 5 5 5 5 60 80 800 20 40 60 80 900 20 40 60 80 000 50 100 150 200 25 30 35 400 50 500 50 600 6758895 000 50 100 522 1 11り22 2 22 2 22222 22222 22333 333 5 4 2 0 8 53186 30 .7 4 i 85295 28518 406 55 67889 01123 34556 77899 01122 3 fin 22222 22222 22222 22222 22222 22222 22222 222 88573 51178 32760 02030 16696 84485 5 33333 33344 44444 44444 45555 555 292 80 3 1282 09 86322 07 7 2 2 3 5398e92 8 8 2 89534 875 000 20ー360 80 100 120 4 60 80 200 2 2 2 23 20 3 3 3 . 40 60 80 600 20 6 6 6 700 20 40 4 2 4 4 4 TK TABLE A-20 Ideal-gas properties of carbon dioxide, C kJ/kmol kJ/kmol 202.966 205.920 208.717 6,938 5,285 7,627 246.282 247.032 247.773 248.507 249.233 249.952 210.062 19,672 20,078 25,648 26,631 21,305 215.146 216.351 7,526 7,826 252.065 252.755 253.439 254.117 22,522 218.694 29,629 24,242 24,669 25,097 30,644 256.110 256.762 257.408 225.225 226.250 227.258 228.252 229.230 230.194 13,372 10,714 259.311 260.551 15,483 28,588 29,031 29,476 35,821 36,347 36,876 262.371 262.968 263.559 233.916 234.814 235.700 13,885 264.728 265.304 265.877 266.444 18,576 237.439 238.292 40,070 40,607 239.962 240.789 241.602 242.405 267.566 33,537 42,226 TABLE Ideal-gas properties of carbon dioxide, CO, (Concludec) A-20 kJ/kmol 1000 269.215 270.293 86,420 43,859 44,953 46,051 35,378 88,806 302.884 303.544 304.198 1080 274.445 275.444 92,394 93.593 94,793 49,369 50,484 305.487 306.122 277.403 278.361 80,031 97,197 98,401 99,606 53,848 82,105 1220 280.238 308.604 282.066 282.962 283.847 2050 103,835 106,864 109,898 112,939 115,984 86,791 89,404 1280 49,691 50,672 94,648 62,963 286.439 287.283 65,271 1420 2500 131.290 322.808 324.026 56,609 2650 140,533 143.620 146,713 326.396 327.549 292.888 123,849 152,908 129,212 131,898 62,630 296.632 333.037 162,226 335.114 336.126 298.781 299.482 300.177 300.863 168,456 145,385 339.069 85,231 70,764 938 PROPERTY TABLES AND CHARTS TABLE A-26 halpy of formation, Gibbs function of formation, and absolute entropy at 25°C, 1 atm 5° Substance Formula kJ/kmol kJ/kmol kJ/kmol.K Carbon 0 5.74 0 130.68 "О 191.61 05.04 -137,150 197.65 0 Hydrogen Nitrogen 0 Carbon monoxide Carbon dioxide CO2(g) 393,520-394,360 213.80 H200e) 285,830 -237,180 69.9 NH 188.8 Water Hydrogen peroxide H0,2)136,310 -105,600 232.6 Ammonia 16,590 192.33 186.16 -46,190 Acetylene Ethylene Ethane C2H2(8) +226,730 +2 C2H4(8 +52,280+68,120 219.83 -84,680 -32,890 229.49 Propylene Propane n-Butane n-Octane n-Octane n-Dodecane Benzene Methyl alcohol Methyl alcohol Ethyl alcohol Ethyl alcohol Oxygen Hydrogen Nitrogen C3H6(g) CaHag)-103,850 -23,490 269.91 CHiog) CgH18(g) CgHi8() C12H26g-291,010 +50,150 622.83 +20,410 +62,720 266 15,710 310.12 208,450+16,530466.73 +6,610360.79 249,95 +82,930 +129,660 269.20 CH,OH(g) -200,670 -162,000 239.70 CH OH(e) -238,660 -166,360 126.80 C2H,OH(g)-235,310-168,570 282.59 C2H,OH(e)-277,690-174,890 277,690-174,890 160.70 +249,190 +231,770 161.06 +218,000 +203,290 114.72 +472,650 +455,510 153.30 +39,460 +34,280 183.70 H(g) N(g) OH(g) Hydroxyl Source of Data: From JANAF, Thermochemical Tables (Midland, MI: Dow Chemical Co., 1971) Selected Values of Chemical Thermodynamic Properties, NBS Technical Note 270-3, 1968; and API Research Project 44 (Carnegie Press, 1953). TABLE A-27 Enthalpy of Specitic heating heating vaporization,2 heat, c value,value mass, Density, Fuel (phase) Formula 12.011 2.016 0.708 32,800 32,800 4.4 141,800 120,000 Carbon monoxide (g) Methane (g Methanol (e) CO 16.043 32.042 26.038 30.070 46.069 2.20 55.530 50,050 1168 172 335 0.790 2.53 22,660 19,920 1.69 49,97048,280 1.75 51,900 47,520 2.44 29,670 26,810 2.77 50,330 46,340 2.42 49,15045,370 2.20 47,760 44,630 2.32 48,570 44,910 Butane () 1-Pentene () Isopentane (e) Benzene () 58.123 0.579 0,641 0.626 0.877 0.673 0.660 0.867 72.150 78.114 84.161 86.177 92.141 100.204 114.231 142.285 100-110 170 1.72 41,800 40,100 1.84 47,500 44,400 2.27 48,310 44,740 1.71 42,40040,500 2.24 48,100 44,600 2.2347,890 44.430 2.2147,640 44,240 Heptane () 0.703 0.730 361 350 47,30044,000 072-078 0.78-0.84 CHỉ.87a 2.246,100 43,200 1.9 45,500 42,800 0.82-0.88 Heavy diesel (e) 50,000 45,000 CHNo.n 18 At 1 atm and 20C At 25*C for liquid fuels, and 1 atm and normal boiling temperature for gaseous fuels At 25*C. Multiply by molar mass to obtain heating values in kJrkmol. 940 TABLE A-28 Natural logarithms of the equilibrium constan e equilibrium constant K, for the reaction "A 8C+D is defined as K,-PR. Temp.. 298 -164.005 -186.975 -367.480 500-92.827 -105.630 -213.372 1000 -39.80345.150 -99.127 1200 -30.874-35.005 -80.011 1400 -24.463-27.742 -66.329 1600 -19.637-22.285 -56.055 1800 -15.866-18.030 -48.051 2000 -12.840-14.622 -41.645 2200 -10.353 -11.827-36.391 2400 -8.2769.497-32.011 2600 -6.517-7.521 28.304 2800 5.002-5.826-25.117 3000-3.685 -4.357-22.359 3200-2.534 -3.072 -19.937 3400 -1.516-1.935-17.800 3600-0.609 -0.926-15.898 3800 0.202-0.019-14.199 0.934 0.796 -12.660 2.513 -9.414 3.895 6.807 5.023 -4.666 -92.208 -106.208 -60.281 -103.762 57.616 23.529 17.871 -13.842 -10.830 -8.497 -6.635 -5.120 20.295 -14.609 16.099 -13.066 -10.657 -8.728 -11.921 8.145 -5.619 -3.433 3.019 -4.719 -2.801 2.937 2.212 -2.114 2.451 1.891 1.392 0.945 -0,542 0.701 -1.513 -0.501 4000 -0.921 -0.686 0.920 500 2.486 5000 3.725 5500 4.743 60005.590 3.197 4.245 5.963 Source of Data: Gordon J. Van Wylen and Richard E. Sonntag. Fundamentals of Classical Thermodymamics, English/SI Version, 3rd ed. New York John Wiley &Sons, 1986), p. 723, table A.14. Based on thermodynamic data given in JANAF, Thermachemical Tables (Midland, MI: Thermal Research Laboratory. The Dow Chemical Company, 1971).

Answer 1

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