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Alternative Control Technologies Document - US Environmental ...

Alternative Control Technologies Document - US Environmental ...

Alternative Control Technologies Document - US Environmental

Alternative Control Technologies Document NOx Emissions from Utility Boilers Emission Standards Division U. S. Environmental Protection Agency Office of Air and Radiation Office of Air Quality Planning and Standards Research Triangle Park, North Carolina 27711 March 1994 EPA-453/R-94-023

  • Page 2 and 3: TABLE OF CONTENTS ii Page 1.0 INTRO
  • Page 4 and 5: TABLE OF CONTENTS (Continued) iv Pa
  • Page 6 and 7: LIST OF TABLES vi Page 2-1 Uncontro
  • Page 8 and 9: LIST OF TABLES (Continued) viii Pag
  • Page 10 and 11: LIST OF TABLES (Continued) x Page 7
  • Page 12 and 13: LIST OF FIGURES (Continued) xii Pag
  • Page 14 and 15: LIST OF FIGURES (Continued) xiv Pag
  • Page 16 and 17: LIST OF FIGURES (Continued) xvi Pag
  • Page 18 and 19: LIST OF FIGURES (Continued) xviii P
  • Page 20 and 21: LIST OF FIGURES (Continued) xx Page
  • Page 22 and 23: LIST OF FIGURES (Continued) xxii Pa
  • Page 24 and 25: equipment vendors, and Federal, Sta
  • Page 26 and 27: emissions. These characteristics in
  • Page 28 and 29: NOx emissions are considered to be
  • Page 30 and 31: EMISSION LEVELS FROM CONVENTIONAL 0
  • Page 32 and 33: NOx emissions in the range of 0.4 t
  • Page 34 and 35: Fluidized bed combustion is an inte
  • Page 36 and 37: gives the NOx emissions for the FBC
  • Page 38 and 39: Low NOx burners are designed to del
  • Page 40 and 41: minimized because NH3 is a pollutan
  • Page 42 and 43: EMISSIONS FROM COAL-FIRED BOILERS W
  • Page 44 and 45: oilers with uncontrolled NOx levels
  • Page 46 and 47: As shown in table 2-4 2-22
  • Page 48 and 49: , applying SNCR to pre-NSPS tangent
  • Page 50 and 51: the results indicate approximately
  • Page 52 and 53:

    Table 2-5 2-28

  • Page 54 and 55:

    presents a summary of the cost effe

  • Page 56 and 57:

    2-32

  • Page 58 and 59:

    2-34

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    Figure 2-2 2-36

  • Page 62 and 63:

    shows the NOx control cost effectiv

  • Page 64 and 65:

    shows the NOx control cost effectiv

  • Page 66 and 67:

    and ranges from a low of $1,500 per

  • Page 68 and 69:

    2-44

  • Page 70 and 71:

    level (lb/MMBtu) NSPS Boilers reduc

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    The pre-NSPS tangential boilers are

  • Page 74 and 75:

    Table 2-8 2-50

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    presents a summary of expected NOx

  • Page 78 and 79:

    Table 2-9 2-54

  • Page 80 and 81:

    CONTROL COST technology EFFECTIVENE

  • Page 82 and 83:

    2-58

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    $14,200 per ton for natural gas-fir

  • Page 86 and 87:

    shows the NOx control cost effectiv

  • Page 88 and 89:

    shows the NOx control cost effectiv

  • Page 90 and 91:

    delaying the mixing of fuel with th

  • Page 92 and 93:

    Control Boiler efficiency BOOS, LEA

  • Page 94 and 95:

    2-70

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    Table 2-11 2-72

  • Page 98 and 99:

    summarizes the impacts from SNCR an

  • Page 100 and 101:

    3.0 OVERVIEW AND CHARACTERIZATION O

  • Page 102 and 103:

    . 1 Generating capability is the ac

  • Page 104 and 105:

    Figure 3-2. Coal-Fired Generating C

  • Page 106 and 107:

    Figure 3-3. Gas-Fired Generating Ca

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    Figure 3-4. Oil-Fired Generating Ca

  • Page 110 and 111:

    3-86

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    3-88

  • Page 114 and 115:

    frequently affect regional use patt

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    . 5 The ASTM classification for hig

  • Page 118 and 119:

    and (4) mineral impurities, or coal

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    presents sources and analyses of va

  • Page 122 and 123:

    are shown in tables 3-1 and 3-2. Co

  • Page 124 and 125:

    . 9 Fuel oils are graded according

  • Page 126 and 127:

    . 10,11 Compared to coal, fuel oils

  • Page 128 and 129:

    vary in composition across the Unit

  • Page 130 and 131:

    . 12 Prior to distribution, however

  • Page 132 and 133:

    Figure 3-5. Simplified boiler schem

  • Page 134 and 135:

    combustion in boilers having staged

  • Page 136 and 137:

    Figure 3-6. Firing Pattern in a Tan

  • Page 138 and 139:

    Figure 3-7. Burner Assembly of a Ta

  • Page 140 and 141:

    3-116

  • Page 142 and 143:

    oilers generally emit relatively lo

  • Page 144 and 145:

    Figure 3-8. Single wall-fired boile

  • Page 146 and 147:

    Figure 3-9. Circular-type burner fo

  • Page 148 and 149:

    3-124

  • Page 150 and 151:

    adial spuds that consist of a gas p

  • Page 152 and 153:

    . 3.3.2.2.3 Cell. Cell-type wall-fi

  • Page 154 and 155:

    shows a natural gas-fired cell burn

  • Page 156 and 157:

    3-132

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    Figure 3-12 3-134

  • Page 160 and 161:

    shows an arch-fired boiler where pu

  • Page 162 and 163:

    . 22 In turbo-fired boilers, air an

  • Page 164 and 165:

    3-140

  • Page 166 and 167:

    Figure 3-14. Cyclone Burner 3-142

  • Page 168 and 169:

    Figure 3-15. Firing arrangements us

  • Page 170 and 171:

    Figure 3-16. Spreader type Stoker-F

  • Page 172 and 173:

    3-148

  • Page 174 and 175:

    continuous-cleaning grates. They ar

  • Page 176 and 177:

    Figure 3-17. Simplified AFBC proces

  • Page 178 and 179:

    3-154

  • Page 180 and 181:

    air/combustion gas stream. These so

  • Page 182 and 183:

    coal and with the size and type of

  • Page 184 and 185:

    flame temperatures, and thereby red

  • Page 186 and 187:

    3.3.3.4 Economizers. Economizers im

  • Page 188 and 189:

    3-164

  • Page 190 and 191:

    oilers; up to 20 percent less air v

  • Page 192 and 193:

    3-168 39

  • Page 194 and 195:

    3-170

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    15. Telecon. Rosa, J., Tenneco Gas,

  • Page 198 and 199:

    Class and group I. Anthracitic 1. M

  • Page 200 and 201:

    4.0 CHARACTERIZATION OF NOx EMISSIO

  • Page 202 and 203:

    Figure 4-1. Variation of flame temp

  • Page 204 and 205:

    4-180

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    fuel-lean side of stoichiometry, fe

  • Page 208 and 209:

    Figure 4-2a. Comparison of fuel NOx

  • Page 210 and 211:

    Figure 4-3. Fuel nitrogen oxide to

  • Page 212 and 213:

    Figure 4-4. Fuel-bound nitrogen-to-

  • Page 214 and 215:

    4-190

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    other fuel property that correlates

  • Page 218 and 219:

    4.2.1.2.2 Cell. Cell-type units con

  • Page 220 and 221:

    TABLE 4-1. TYPICAL FUEL NITROGEN CO

  • Page 222 and 223:

    4-198

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    Note: Same Btu input. Figure 4-5. C

  • Page 226 and 227:

    Figure 4-6. Effect of mill pattern

  • Page 228 and 229:

    4-204

  • Page 230 and 231:

    for natural gas of 1,000 Btu/scf. A

  • Page 232 and 233:

    TABLE 4-2. UNCONTROLLED/BASELINE NO

  • Page 234 and 235:

    the wall units and the typical emis

  • Page 236 and 237:

    TABLE 4-3. UNCONTROLLED/BASELINE NO

  • Page 238 and 239:

    4.3.1.3 Oil-Fired Boilers. Table 4-

  • Page 240 and 241:

    shows typical, low, and high uncont

  • Page 242 and 243:

    Table 4-5 shows typical, low, and h

  • Page 244 and 245:

    4-220

  • Page 246 and 247:

    56. Wagner, J. K., Rothschild, S. S

  • Page 248 and 249:

    TABLE 5-1. NOx EMISSION CONTROL TEC

  • Page 250 and 251:

    5-226

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    changes may be rather easily implem

  • Page 254 and 255:

    that serve the lower burners. The B

  • Page 256 and 257:

    presents data from four utility boi

  • Page 258 and 259:

    Figure 5-1a. Typical opposed wall-f

  • Page 260 and 261:

    Overfire air can be applied to tang

  • Page 262 and 263:

    direct a percentage of the total co

  • Page 264 and 265:

    5.1.2.1.2 Tangentially-fired boiler

  • Page 266 and 267:

    and are typically referred to as cl

  • Page 268 and 269:

    5.1.2.3 Performance of Overfire Air

  • Page 270 and 271:

    The table contains two tangentially

  • Page 272 and 273:

    levels for tangential boilers due t

  • Page 274 and 275:

    Figure 5-4. Controlled Flow/Split F

  • Page 276 and 277:

    achieved by the dual register desig

  • Page 278 and 279:

    , is similar to the CF/SF burner. 1

  • Page 280 and 281:

    , the burner is equipped with fixed

  • Page 282 and 283:

    The RO-II burner consists of a sing

  • Page 284 and 285:

    shows the key components of the bur

  • Page 286 and 287:

    17 Nitrogen oxide control is achiev

  • Page 288 and 289:

    15 Typically, in the LNCB design, t

  • Page 290 and 291:

    5-266

  • Page 292 and 293:

    5-268

  • Page 294 and 295:

    Figure 5-11a. Typical fuel and air

  • Page 296 and 297:

    Figure 5-12a. Low NOx Concentric Fi

  • Page 298 and 299:

    5-274

  • Page 300 and 301:

    educe the slagging and tube corrosi

  • Page 302 and 303:

    , the PM burner system uses a coal

  • Page 304 and 305:

    parameters cannot be altered in a c

  • Page 306 and 307:

    Table 5-4 5-282

  • Page 308 and 309:

    Table 5-4 continued 5-284

  • Page 310 and 311:

    5-286

  • Page 312 and 313:

    normal boiler operation than the sh

  • Page 314 and 315:

    shows trends in controlled NOx leve

  • Page 316 and 317:

    to a controlled level of 0.4 lb/MMB

  • Page 318 and 319:

    Table 5-5 5-294

  • Page 320 and 321:

    Table 5-5 continued 5-296

  • Page 322 and 323:

    Figure 5-15. NOx emissions from new

  • Page 324 and 325:

    5-300

  • Page 326 and 327:

    5-302

  • Page 328 and 329:

    0.39 lb/MMBtu. Two wall units repor

  • Page 330 and 331:

    , the NOx decreased as load decreas

  • Page 332 and 333:

    shows a schematic of a wall-fired b

  • Page 334 and 335:

    . 55 For LNCFS Level I, CCOFA is in

  • Page 336 and 337:

    5-312

  • Page 338 and 339:

    Table 5-6 5-314

  • Page 340 and 341:

    Table 5-6 continued 5-316

  • Page 342 and 343:

    5-318

  • Page 344 and 345:

    0.34 lb/MMBtu. At lower loads, the

  • Page 346 and 347:

    shows that short-term controlled NO

  • Page 348 and 349:

    LNB + OFA systems. The performance

  • Page 350 and 351:

    Short-term averages of NOx emission

  • Page 352 and 353:

    presents a simplified diagram of co

  • Page 354 and 355:

    5-330

  • Page 356 and 357:

    To complete the combustion process,

  • Page 358 and 359:

    5-334

  • Page 360 and 361:

    zone be reduced and an equivalent a

  • Page 362 and 363:

    shows an example of a co-firing app

  • Page 364 and 365:

    combustibles from the furnace befor

  • Page 366 and 367:

    All three boilers burn bituminous c

  • Page 368 and 369:

    75 percent load. The reburn system

  • Page 370 and 371:

    The one co-firing application on ta

  • Page 372 and 373:

    and reburn technology are provided

  • Page 374 and 375:

    BF pattern, including the degree of

  • Page 376 and 377:

    presents data for BOOS, LEA, and co

  • Page 378 and 379:

    5-354

  • Page 380 and 381:

    fans are located between the FD fan

  • Page 382 and 383:

    presents data for FGR applied to on

  • Page 384 and 385:

    TABLE 5-11. PERFORMANCE OF OFA + LE

  • Page 386 and 387:

    5.2.4.1.1 Wall-fired boilers. As wi

  • Page 388 and 389:

    . 83 Combustion in a ROPM TM burner

  • Page 390 and 391:

    schematically illustrates the inter

  • Page 392 and 393:

    pokers have skewed, flat tips perfo

  • Page 394 and 395:

    , can fire natural gas or oil. 84 T

  • Page 396 and 397:

    , was developed to improve the NOx

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    , is also available for wall-fired

  • Page 400 and 401:

    5-376

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    Figure 5-30. Low NOx Swirl Tertiary

  • Page 404 and 405:

    Figure 5-31. Pollution Minimum TM b

  • Page 406 and 407:

    5-382

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    zones, thereby maintaining the NOx

  • Page 410 and 411:

    Reduction TABLE 5-12. PERFORMANCE O

  • Page 412 and 413:

    Alamitos 6 had higher uncontrolled

  • Page 414 and 415:

    Table 5-13 5-390

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    . Results are given for one tangent

  • Page 418 and 419:

    educed the NOx emissions to 0.43 lb

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    As shown in figure 5-32 5-396

  • Page 422 and 423:

    , for the ammonia-based SNCR proces

  • Page 424 and 425:

    As shown in figure 5-33 5-400

  • Page 426 and 427:

    , in the urea-based SNCR process, a

  • Page 428 and 429:

    . 95 The solution is injected into

  • Page 430 and 431:

    SNCR systems except that the pressu

  • Page 432 and 433:

    As shown in figure 5-35 5-408

  • Page 434 and 435:

    , the gas temperature can greatly a

  • Page 436 and 437:

    NOTE: This figure is representative

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    Figure 5-37. Ammonia salt formation

  • Page 440 and 441:

    5-416

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    Table 5-14 5-418

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    Table 5-14 continued 5-420

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    Table 5-14 continued 5-422

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    5-424

  • Page 450 and 451:

    5-426

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    0.21 lb/MMBtu at minimum load depen

  • Page 454 and 455:

    and 5-39 for coal-fired and for nat

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    5-432

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    given in table 5-15. 5-434

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    Two of the boilers are bubbling bed

  • Page 462 and 463:

    Figure 5-40. Relative effect of tem

  • Page 464 and 465:

    Figure 5-41 5-440

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    shows several SCR configurations th

  • Page 468 and 469:

    , the flue gas passes through the a

  • Page 470 and 471:

    5-446

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    Figure 5-43. Typical configuration

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    Figure 5-44. Example of optimum tem

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    5-452

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    Figure 5-45. Configuration of paral

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    5-456

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    Figure 5-46. Effect of temperature

  • Page 484 and 485:

    application experience with medium-

  • Page 486 and 487:

    velocity, and catalyst condition. O

  • Page 488 and 489:

    presents the results from pilot-sca

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    Figure 5-47a. Extruded catalyst NOx

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    Figures 5-48a 5-468

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    and 5-48b show performance results

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    Figure 5-49a. T1O2 corrugated plate

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    5-474

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    NOx emissions on fossil fuel-fired

  • Page 502 and 503:

    . The predicted NOx reduction for L

  • Page 504 and 505:

    5.4 REFERENCES 1. Letter and attach

  • Page 506 and 507:

    18. Donais, R. E., et al. 1989 Upda

  • Page 508 and 509:

    41. Letter and attachments from San

  • Page 510 and 511:

    64. Hunt, T., et al. Selective Non-

  • Page 512 and 513:

    85. Lisauskas, R. A., and C. A. Pen

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    104. Mansour, M. N., Nahas, S. N.,

  • Page 516 and 517:

    125. Rummenhohl, V., Weiler, H., an

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    TABLE 5-4. PERFORMANCE OF LNB RETRO

  • Page 520 and 521:

    Utility N. Indiana Public Service C

  • Page 522 and 523:

    TABLE 5-5. PERFORMANCE OF LNB ON NE

  • Page 524 and 525:

    TABLE 5-6. PERFORMANCE OF LNB + OFA

  • Page 526 and 527:

    Utility Pacific Gas & Electric Hawa

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    Utility New England Power Co. Wisco

  • Page 530 and 531:

    Utility Long Island Lighting Co. Sa

  • Page 532 and 533:

    Utility Pacific Gas & Electric TABL

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    Basic equipment Initial chemicals/c

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Table LIV TABLE 5-14. PERFORMANCE O

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    . TABLE 5-14. PERFORMANCE OF SNCR O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 80 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 82 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 84 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Total capital cost, TABLE 5-14. PER

  • Page 578 and 579:

    Figure 86 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 90 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 94 TABLE 5-14. PERFORMANCE O

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 104 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Total capital cost, TABLE 5-14. PER

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    Figure 108 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Table 13 (cont.) TABLE 5-14. PERFOR

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 112 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 114 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 118 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 122 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Cost effectiveness, $/ton TABLE 5-1

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Total capital cost, TABLE 5-14. PER

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    Figure 124 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    Figure 128 TABLE 5-14. PERFORMANCE

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    TABLE 5-14. PERFORMANCE OF SNCR ON

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    BOILERS TABLE 6-19. COSTS FOR LNB +

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    6.6 REFERENCES TABLE 5-14. PERFORMA

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    TABLE 6-4. DESIGN AND OPERATING CHA

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    TABLE 6-8. COSTS FOR NGR APPLIED TO

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    TABLE 6-13. COSTS FOR SNCR APPLIED

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    7.0 ENVIRONMENTAL AND ENERGY IMPACT

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    7-790

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    7-792

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    7-794

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    prior to the retrofit and the decre

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    levels of 50 to 214 ppm. The corres

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    7-800

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    presents UBC and boiler efficiency

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    7-804

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    Lawrence 5, the UBC decreased from

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    summarizes the PM and THC emissions

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    Table 7-4 7-810

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    presents a summary of CO, UBC, and

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    7.2 EFFECTS FROM COMBUSTION CONTROL

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    7-818

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    producers that may have upper limit

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    As table 7-6 7-822

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    shows, the potential impacts can be

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    Data are shown for one coal-fired,

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    one mole of CO if the CO bound in u

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    TABLE 7-8. SUMMARY OF CARBON MONOXI

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    Fuel TABLE 7-9. SUMMARY OF AMMONIA

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    7-834

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    7.4 REFERENCES 1. Sawyer, J. W., an

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    10. Letter and attachments from Har

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    34. Makansi, J. Fuel biasing Lowers

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    52. Questionnaire Response from Hes

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    Utility TABLE 7-1. SUMMARY OF CARBO

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    Utility Illinois Power Co. Wisconsi

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    Utility Arizona Public Service Co.

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    Utility City of Pasadena Water & Po

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    TABLE 7-5. SUMMARY OF CARBON MONOXI

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    Results shown for a normalized stoi

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    A.1 METHODOLOGY The basic methodolo

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    variable components. Fixed O&M cost

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    For a 100 MW wall coal-fired boiler

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    A.2 LNB APPLIED TO COAL-FIRED WALL

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    A-1. Presented in the table are uti

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    Figure A-1 A-11

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    A-13

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    A.2.4 Indirect Cost Indirect cost f

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    From this, the basic system cost al

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    A-19

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    A.5 LNB + AOFA APPLIED TO COAL-FIRE

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    A-2. Presented in the table are uti

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    Figure A-2 A-25

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    A-27

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    A.6 NATURAL GAS REBURN APPLIED TO C

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    A-3. As shown, the total capital co

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    A.7 OPERATIONAL MODIFICATIONS (LEA

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    A.8 LNB APPLIED TO NATURAL GAS- AND

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    A-4. All three points reflect total

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    , suggests that the total capital c

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    A.8.5 Fixed O&M Fixed O&M costs inc

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    A.10 SNCR A.10.1 Data Summary To es

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    where: Based upon the 15 case studi

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    A total of 15 case studies were dev

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    where: Total capital cost is calcul

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    Fuel Boiler Type c d Coal Wall 284,

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    A.13 APPENDIX REFERENCES 1. Letter

National Action Plan for Energy Efficiency - US Environmental ...
epa.gov
Alternative Control Techniques Document-- NO Emissions from - US ...
epa.gov
Alternative Control Techniques Document: - US Environmental ...
epa.gov
Alternative Technologies for Surface Finishing - US Environmental ...
epa.gov
NOx Emissions from Process Heaters - US Environmental Protection ...
epa.gov
Alternative Monitoring Plan for Enclosed Flare - US Environmental ...
epa.gov
Ethyl Acrylate Interim AEGL Document - US Environmental ...
epa.gov
Technical Resource Document - US Environmental Protection Agency
epa.gov
US Heavy alternative brochure - Encana
encana.com
Costs of Emission Control Technologies - MARAMA
marama.org
Survey of Control Technologies for Low Concentration Organic - US ...
epa.gov
AP-42, Vol. 1, Final Background Document for - US Environmental ...
epa.gov
US EPA's Today's Environmental Technologies—Innovative ...
epa.gov
US EPA's Today's Environmental Technologies—Innovative ...
epa.gov
eSpin Technologies - US Environmental Protection Agency
epa.gov
Reciprocating Engines - US Environmental Protection Agency
epa.gov
RACT/BACT/LAER Clearinghouse (RBLC) - US Environmental ...
epa.gov
Malathion Interim AEGL Document - US Environmental Protection ...
epa.gov
Technical Support Document - US Environmental Protection Agency
epa.gov
Human Exposures Under Control - US Environmental Protection ...
epa.gov
Methamidophos Propoed AEGL Document - US Environmental ...
epa.gov
Hydrogen Cyanide Final AEGL Document - US Environmental ...
epa.gov
Electric Generating Units - US Environmental Protection Agency
epa.gov
biopesticide registration action document - US Environmental ...
epa.gov
Low-Tech Alternative to Activated Sludge - US Environmental ...
epa.gov
Pulp and Paper - US Environmental Protection Agency
epa.gov
Response to Comments Document (PDF) - US Environmental ...
epa.gov
Technical Support Document - US Environmental Protection Agency
epa.gov
Groundwater Contamination Under Control - US Environmental ...
epa.gov
Control Of - US Environmental Protection Agency
epa.gov