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Chapter 22.4 Techniques to consider in the determination of BATConventional steam reforming is described in Section 2.2.3.Partial oxidation is described in Section 2.2.4.2.4.1 Advanced conventional processesDescriptionThe different process steps for the conventional steam reforming process are integrated withrespect to mass and energy flow. During the years of development, a considerable reduction inenergy consumption has been achieved by improving the existing components in the process. Inaddition, today’s equipment and machinery can achieve a considerable thermodynamicefficiency and a high degree of reliability. Online availability exceeding 93 % is not uncommonin such plants. Advanced conventional process plants are usually characterised by the followingfeatures:• high duty primary reformer using high pressures of up to 40 bar• equipped with low NO x burners• stoichiometric air in secondary reforming (stoichiometric H/N ratio)• low energy CO 2 removal system.Differences in the configurations offered by the various engineering contractors generally resultfrom the optimised arrangements that they utilise and from using different well developedequipment designs. Specific examples of some applied techniques are:• increasing the temperatures of the mixed feed and process air in line with the current limitsfor metallurgical standards for construction. This, in turn, allows for a reduced reformerfiring and an increase in the reformer operating pressure, which also saves in the energyneeded for compression of the synthesis gas• utilising the recovered heat after the secondary reformer to raise and superheat steam• applying improved designs of high temperature shift reactors for lower steam to carbon ratio• utilising ammonia converter designs which use small size catalysts for higher conversions• ensuring the efficient recovery of a large proportion of reaction heat energy from theammonia synthesis. This is achieved by extracting the heat from the ammonia synthesisloop and using it to raise high pressure steam• applying a highly efficient ammonia condensation and refrigeration system.The high levels of NO x emissions of the conventional process are mainly due to the particularfiring conditions in the primary reformer. The use of low NO x burner techniques minimises thelevel, but relatively high NO x emissions still remain.Achieved environmental benefitsIn comparison with conventional processes, the following environmental benefits are achieved:• reduced reformer firing, lower NO x emissions• energy savings.For achievable emission and consumption levels, see:• Table 2.6 for energy consumption• Table 2.7 for NO x emissions• and Table 2.8 and Table 2.9 for other levels.58 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers
Chapter 2Cross-media effects• still relatively high NO x emissions.Operational dataSee Description.ApplicabilityApplicable in new and existing plants. The applicability in existing plants requires anassessment of the specific case.EconomicsCost benefits can be presumed.Driving force for implementationPlant optimisation and cost benefits.References to literature and example plants[1, EFMA, 2000, 3, European Commission, 1997]Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 59
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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
Page 36 and 37: Chapter 11,8Relative production cap
Page 38 and 39: Chapter 11.2.3 Supply of steam and
Page 40 and 41: Chapter 11.3 Overview of emissions
Page 42 and 43: Chapter 1ApplicabilityGenerally app
Page 44 and 45: Chapter 11.4.3 Handling excess stea
Page 46 and 47: Chapter 11.4.5 Optimisation/mainten
Page 48 and 49: Chapter 1Operational dataNo informa
Page 50 and 51: Chapter 1ApplicabilityEspecially ap
Page 52 and 53: Chapter 11.4.9 Environmental manage
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Page 56 and 57: Chapter 1iv. allow for comparison w
Page 58 and 59: Chapter 1A number of studies show t
Page 60 and 61: Chapter 11.5 Common BATIn understan
Page 62 and 63: Chapter 11.5.2 BAT for environmenta
Page 64 and 65: Chapter 2Location CompanyCapacity F
Page 66 and 67: Chapter 22.2.2 Output from ammonia
Page 68 and 69: Chapter 22.2.3.2 Primary reformingT
Page 70 and 71: Chapter 2Process name Solvent/reage
Page 72 and 73: Chapter 22.2.4 Partial oxidationThe
Page 74 and 75: 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 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 and 126: Chapter 3Pressure in bar Temperatur
Page 127 and 128: Chapter 33.2.5 Tail gas properties
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
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Chapter 3Process typeNO x emission
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Chapter 3140120Generation factor %1
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Chapter 33.4.2 Optimisation of the
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Chapter 33.4.3 Alternative oxidatio
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Chapter 33.4.4 Optimisation of the
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Chapter 3Achieved environmental ben
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Chapter 33.4.5 N 2 O decomposition
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Chapter 33.4.6 Catalytic N 2 O deco
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Chapter 3According to [89, Kuiper,
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Chapter 33.4.7 Combined NO x and N
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Chapter 3EconomicsInvestment costs.
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Chapter 3Operational dataSee descri
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Chapter 3NOx removal efficiency in
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Chapter 33.4.10 Addition of H 2 O 2
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Chapter 33.4.11 NO X reduction duri
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Chapter 3Installing a low temperatu
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Chapter 3NO x emission level as NO
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Chapter 3Operational dataNo specifi
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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 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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