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Chapter 3NH 3PowerAirHeatEvaporationFiltrationFiltrationCompression (optional)Air for bleachingHeating (optional)FiltrationEmission to air50 – 65 %HNO 3MixingExpanderturbinePowerWaterFiltration (optional)CatalyticreactorTail gastreatmentMono pressure plantsAbsorption andbleachingBoilerfeed waterHeatexchangerHeatexchangerCoolercondenserPowerSecondaryair frombleachingColdtail gasfromabsorptionSteamturbineDualpressureplantsCompressionHeatexchangerCoolercondenserPowerSteamTail gasFigure 3.2: Overview of the production of HNO 3This figure is based on [88, infoMil, 1999, 102, EFMA, 2000]98 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers
Chapter 33.2.5 Tail gas properties and emission reductionThe tail gas composition depends on the applied process conditions. Table 3.3 gives anoverview of tail gas properties.Parameter Level UnitNO x as NO 2 200 – 4000 mg/Nm 3NO/NO 2 ratio about 1/1 molar ratioN 2 O 600 – 3000 mg/Nm 3O 2 1 – 4 % v/vH 2 O 0.3 – 0.7 % v/vPressure 3 – 12 barTemperature after absorption 20 – 30 ºCTemperature after reheating 200 – 500 ºCVolume flowTable 3.3: Tail gas properties after the absorption stage[94, Austrian UBA, 2001], x [112, Gry, 2001]20000 – 100000 Nm 3 /hour3100 – 3300 x Nm 3 /tonne 100 % HNO 3The most common treatment techniques for tail gases from nitric acid plants are:• SCR (for NO x abatement, see Section 3.4.9)• NSCR (for NO x and N 2 O abatement, see Section 3.4.8.More recent strategies to reduce NO x or N 2 O emissions include:• optimisation of the oxidation stage (see Sections 3.4.1, 3.4.2, 3.4.3 and 3.4.5)• catalytic decomposition of N 2 O, applied already in the oxidation reactor, directly after theoxidation catalyst (see Section 3.4.6)• optimisation of the absorption stage (see Section 3.4.4)• combined catalytic NO x /N 2 O abatement with intermediate injection of NH 3 , applied to thetail gas in front of the expander turbine (see Section 3.4.7).3.2.6 Energy exportThe nitric acid process has undergone significant energy improvements during the last decadesfrom atmospheric plants, via M/M units to M/H plants. The reaction from NH 3 to HNO 3theoretically releases 6.3 GJ/tonne 100 % HNO 3 . However, energy losses in gas compressorsand cooling (water) reduce the net steam export. If all thermal energy is converted to electricalpower in a steam turbine, the net energy export will be reduced by approximately 65 %.GJ/tonne 100 % HNO 3RemarkModern M/H plant 2.4 As HP steamAverage net export of European plants 1.6Best plants 30 years ago 1.1Table 3.4: Overview of energy export from HNO 3 production[94, Austrian UBA, 2001, 107, Kongshaug, 1998]Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 99
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EUROPEAN COMMISSIONIntegrated Pollu
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Executive SummaryEXECUTIVE SUMMARYT
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Executive SummaryII.Production and
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Executive Summarybed, using a cesiu
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Executive SummaryConversion process
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Executive SummaryBAT is to treat al
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PrefacePREFACE1. Status of this doc
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Preface5. How to understand and use
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2.2.4.2 Gasification of heavy hydro
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5.4.2 Hemihydrate process (HH) ....
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10.4.3 Fluoride recovery and abatem
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Figure 8.1: Overview of the product
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Table 4.20: Energy balance of a dou
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ScopeSCOPEThis document on Large Vo
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Chapter 197 % of nitrogen fertilise
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Chapter 11.1.2.3 High exhaust gas v
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Chapter 1the SSD of NPK does not le
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Chapter 11,8Relative production cap
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Chapter 11.2.3 Supply of steam and
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Chapter 11.3 Overview of emissions
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Chapter 1ApplicabilityGenerally app
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Chapter 11.4.3 Handling excess stea
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Chapter 11.4.5 Optimisation/mainten
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Chapter 1Operational dataNo informa
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Chapter 1ApplicabilityEspecially ap
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Chapter 11.4.9 Environmental manage
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Chapter 1(v) Documentation- establi
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Chapter 1iv. allow for comparison w
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Chapter 1A number of studies show t
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Chapter 11.5 Common BATIn understan
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Chapter 11.5.2 BAT for environmenta
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Chapter 2Location CompanyCapacity F
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Chapter 22.2.2 Output from ammonia
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Chapter 22.2.3.2 Primary reformingT
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Chapter 2Process name Solvent/reage
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Chapter 22.2.4 Partial oxidationThe
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Chapter 2In the moving bed process,
Page 76 and 77: Chapter 22.2.6 Storage and transfer
Page 78 and 79: Chapter 2Production process Feedsto
Page 80 and 81: Chapter 22.3.2 NO x emissionsTable
Page 82 and 83: Chapter 22.3.3 Other consumption le
Page 84 and 85: Chapter 2ParameterProcessEmission l
Page 86 and 87: Chapter 22.4 Techniques to consider
Page 88 and 89: Chapter 22.4.2 Processes with reduc
Page 90 and 91: Chapter 22.4.3 Heat exchange autoth
Page 92 and 93: Chapter 22.4.4 Revamp: increase cap
Page 94 and 95: Chapter 22.4.5 Pre-reformingDescrip
Page 96 and 97: Chapter 2ApplicabilityGenerally app
Page 98 and 99: Chapter 22.4.7 Advanced process con
Page 100 and 101: Chapter 22.4.9 Combined Claus unit
Page 102 and 103: Chapter 2Operational dataSee Descri
Page 104 and 105: Chapter 22.4.12 Preheating of combu
Page 106 and 107: Chapter 22.4.14 Isothermal shift co
Page 108 and 109: Chapter 22.4.16 Stripping and recyc
Page 110 and 111: Chapter 22.4.18 Use of sulphur resi
Page 112 and 113: Chapter 22.4.20 Indirect cooling of
Page 114 and 115: Chapter 22.4.22 Ammonia removal fro
Page 116 and 117: Chapter 22.4.24 Metal recovery and
Page 118 and 119: Chapter 2Driving force for implemen
Page 120 and 121: Chapter 22.5 BAT for ammoniaBAT is
Page 123 and 124: Chapter 33 NITRIC ACID3.1 General i
Page 125: Chapter 3Pressure in bar Temperatur
Page 129 and 130: Chapter 33.3 Current emission and c
Page 131 and 132: Chapter 3N 2 O emission levelProces
Page 133 and 134: Chapter 3N 2 O emission levelProces
Page 135 and 136: Chapter 3Process typeNO x emission
Page 137 and 138: Chapter 3Process typeNO x emission
Page 139 and 140: Chapter 3140120Generation factor %1
Page 141 and 142: Chapter 33.4.2 Optimisation of the
Page 143 and 144: Chapter 33.4.3 Alternative oxidatio
Page 145 and 146: Chapter 33.4.4 Optimisation of the
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Page 149 and 150: Chapter 33.4.5 N 2 O decomposition
Page 151 and 152: Chapter 33.4.6 Catalytic N 2 O deco
Page 153 and 154: Chapter 3According to [89, Kuiper,
Page 155 and 156: Chapter 33.4.7 Combined NO x and N
Page 157 and 158: Chapter 3EconomicsInvestment costs.
Page 159 and 160: Chapter 3Operational dataSee descri
Page 161 and 162: Chapter 3NOx removal efficiency in
Page 163 and 164: Chapter 33.4.10 Addition of H 2 O 2
Page 165 and 166: Chapter 33.4.11 NO X reduction duri
Page 167 and 168: Chapter 3Installing a low temperatu
Page 169 and 170: Chapter 3NO x emission level as NO
Page 171: Chapter 3Operational dataNo specifi
Page 174 and 175: Chapter 4Country Company Location C
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Chapter 4Country Company Location C
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Chapter 4Figure 4.2 gives an overvi
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Chapter 4Two general converter type
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Chapter 4Figure 4.6 gives an impres
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Chapter 44.2.3 Sulphur sources and
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Chapter 44.2.3.5 Non-ferrous metal
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Chapter 4Sulphur source/SO 2 produc
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Chapter 44.3 Current emission and c
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Chapter 410Tail gas specific SO2 lo
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Chapter 4Capacity in tonnesof 100 %
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Chapter 4Capacity in tonnesof 100 %
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Chapter 4SO 2 sourceSpent acid and
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Chapter 4Cross-media effectsWithout
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Chapter 4Achieved environmental ben
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Chapter 44.4.3 Addition of a 5 th b
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Chapter 44.4.4 Application of a Cs-
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Chapter 4EUR/yearWaste gas volume (
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Chapter 44.4.6 Replacement of brick
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Chapter 4EUR/yearWaste gas volume (
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Chapter 4PlantSO 2 sourceInlet SO 2
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Chapter 44.4.10 Combination of SCR
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Chapter 4Driving force for implemen
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Chapter 44.4.14 Monitoring of SO 2
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Chapter 4EconomicsCost benefits can
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Chapter 4Energy inputRecovery and l
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Chapter 44.4.16 Minimisation and ab
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Chapter 44.4.17 Minimisation of NO
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Chapter 44.4.19 Tail gas scrubbing
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Chapter 44.4.21 Tail gas treatment:
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Chapter 4Economics[58, TAK-S, 2003]
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Chapter 4EconomicsNo specific infor
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Chapter 4BAT is to minimise and red
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Chapter 55.2 Applied processes and
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Chapter 55.2.2.1 Raw materials5.2.2
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Chapter 5OriginChinaMine/regionRare
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Chapter 55.2.2.2 GrindingDepending
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Chapter 5Emission of mg/l g/tonne P
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Chapter 55.4 Techniques to consider
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Chapter 55.4.2 Hemihydrate process
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Chapter 55.4.3 Hemi-dihydrate recry
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Chapter 55.4.4 Hemi-dihydrate recry
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Chapter 55.4.5 Di-hemihydrate recry
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Chapter 55.4.6 RepulpingDescription
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Chapter 55.4.7 Fluoride recovery an
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Chapter 55.4.8 Recovery and abateme
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Chapter 5Operational dataNo informa
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Chapter 55.4.11 Decadmation of H 3
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Chapter 55.4.12 Use of entrainment
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Chapter 5Cross-media effects• dis
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Chapter 5Cross-media effectsTable 5
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Chapter 5ApplicabilityAt present, o
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Chapter 66 HYDROFLUORIC ACID6.1 Gen
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Chapter 6Component Portion (mass co
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Chapter 66.2.4 Process gas treatmen
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Chapter 6Emission of kg/tonne HF Re
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6.4 Techniques to consider in the d
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Chapter 66.4.2 Energy recovery from
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Chapter 66.4.4 Valorisation of fluo
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Chapter 66.4.6 Scrubbing of tail ga
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6.4.7 Scrubbing of tail gases: fluo
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Chapter 66.4.8 Abatement of dust em
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Chapter 66.4.9 Waste water treatmen
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Chapter 6Cross-media effects• 5 -
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Chapter 77 NPK AND CN7.1 General in
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Chapter 77.2.3 Direct neutralisatio
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Chapter 7Fluorine compounds origina
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Chapter7Per tonne productkWh Nm 3 k
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Chapter7Emission levelmg/Nm 3 ppm k
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Chapter7Emission levelmg/Nm 3 ppm k
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7.4 Techniques to consider in the d
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Chapter7Driving force for implement
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Chapter7Achieved environmental bene
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Chapter77.4.6 Recycling warm airDes
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Chapter77.4.7 Optimising the recycl
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Chapter7Operational dataThe volume
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Chapter77.4.11 Recycling of scrubbi
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Chapter77.4.12 Waste water treatmen
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Chapter7ParameterLevelmg/Nm 3Phosph
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Chapter 88.2.1.1 Particle formation
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Chapter 8Consumption of Per tonne u
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Chapter 8Per tonne urea Unit Remark
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Chapter 8Waste water per tonne urea
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Chapter 8Pollutant Source g/tonne u
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Chapter 8Plant Emission Amount (ton
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Chapter 8Operational dataSee Table
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Chapter 8Operational dataSee Table
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Chapter 88.4.6 Redirecting fines to
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Chapter 8Existing plantCase 2Revamp
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Chapter 88.4.8 Heat integration in
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Chapter 88.4.9 Combined condensatio
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Chapter 88.4.10 Minimisation of NH
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Chapter 8Other approaches to proces
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Chapter 88.5 BAT for Urea and UANBA
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Chapter 9Country Company LocationBe
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Chapter 99.2.2 NeutralisationThe ex
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Chapter 9Scrubbing devices• packe
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Chapter 9Pollutant mg/Nm 3 g/tonne
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Chapter 99.4 Techniques to consider
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Chapter 99.4.2 Recovery of residual
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Chapter 99.4.3 Energy consideration
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Chapter 99.4.4 Steam purification a
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Chapter 99.4.5 Autothermal granulat
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Chapter 9ApplicabilityIrrigated can
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Chapter 1010 SUPERPHOSPHATES10.1 Ge
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Chapter 10Emissionto airEmissionto
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Chapter 10Input Indirect granulatio
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Chapter 10Volume5 - 10 m 3 /hourTem
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Chapter 1010.4.2 Recovery and abate
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Chapter 1010.4.4 Recycling of scrub
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Chapter 1111 CONCLUDING REMARKS11.1
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Chapter 11Production of HNO 3 : De-
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References26 Dipankar Das (1998).
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References89 Kuiper (2001). "High t
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References147 Uhde (2006). "The Uhd
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GlossaryCalculation of steam proper
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GlossaryIPCCIPPCISO 14001Intergover
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GlossaryChemical formulasAl 2 O 3Ca
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Annexes14 ANNEXES14.1 Cost calculat
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