Arc furnace physics:
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Düsseldorf
Verl. Stahleisen
2009
|
| Schriftenreihe: | Stahleisen communications
|
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Literaturverz. S. 231 - 242 |
| Beschreibung: | XIX, 247 S. Ill., graph. Darst. 25 cm |
| ISBN: | 9783514007680 |
Internformat
MARC
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| 020 | |a 9783514007680 |c Pp. : EUR 79.00 |9 978-3-514-00768-0 | ||
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| 100 | 1 | |a Bowman, Ben |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Arc furnace physics |c Ben Bowman ; Klaus Krüger |
| 264 | 1 | |a Düsseldorf |b Verl. Stahleisen |c 2009 | |
| 300 | |a XIX, 247 S. |b Ill., graph. Darst. |c 25 cm | ||
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| 338 | |b nc |2 rdacarrier | ||
| 490 | 0 | |a Stahleisen communications | |
| 500 | |a Literaturverz. S. 231 - 242 | ||
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| 999 | |a oai:aleph.bib-bvb.de:BVB01-018942941 | ||
Datensatz im Suchindex
| _version_ | 1804141088950190080 |
|---|---|
| adam_text | Titel: Arc furnace physics
Autor: Bowman, Ben
Jahr: 2009
Contents
1 Arc generalities 1
1.1 General arc physics 1
1.2 Introduction to industrial arcs 2
1.3 Sources of information on arcs 2
2 DC graphite electrode laboratory arcs 5
2.1 Arc stability 5
2.2 The plasma jet 5
2.3 Measurements of arc thrust 6
2.4 Mass flow rate 8
2.5 Arc voltage and voltage gradient 8
2.6 Arc shape 10
2.7 Power balance at the cathode spot 11
2.8 Current density and time constant of the cathode spot 13
2.9 Convective power of the cathode jet 13
2.10 Radiation 14
2.11 Power balance distribution between convection and radiation 15
2.12 Temperature profi les 17
2.13 Summary: The structure and power balance of the DC graphite arc 19
3 Furnace arcs 20
3.1 AC arcs 20
3.1.1 Generalities 20
3.1.2 High speed photos of AC arcs 21
3.1.3 Arc voltage waveforms 23
3.1.4 Analysis of correlated electrical and high speed photographic records 25
3.1.5 Effect of ambient temperature on the arc voltage waveform 26
3.1.6 Diffuse arcs 28
3.1.7 Waveforms recorded on large arc furnaces 28
3.1.8 Arc lengthening measurements 30
3.1.9 Voltage gradients in extremely long arcs in air 31
3.1.10 Radiation measurements from arc and flame 32
3.1.11 Arc flames 32
3.1.12 Summary of measurements on AC arcs 33
3.2 Measurements on DC arcs in furnaces 34
3.2.1 Voltage gradients 34
3.2.2 Arc shape 35
3.2.3 Arc voltage/length relationship 35
3.2.4 Arc voltage and current 36
3.2.5 Average values 37
4 Electrical conductivity, radiation and temperature in furnace arcs 38
4.1 Measurements of arc temperature 38
4.2 Plasma composition in steelmaking furnaces 38
4.2.1 Plasma composition for an arc buried in foaming slag 40
4.3 The electron density and the electrical conductivity 41
4.3.1 Electron density of plasma containing iron vapour 41
4.3.2 Electron density for an arc covered by foaming slag 41
4.3.3 Electrical conductivity 41
4.4 Estimate of arc diameters from conductivity 44
4.5 Radiation in high current arcs 44
4.5.1 Radiation from neutral atoms 44
4.5.2 Radiation from ions and electrons 45
4.5.3 Free-bound radiation 45
4.5.4 Optically thin and optically thick plasmas 45
4.5.5 Radiation from plasmas containing iron vapour 46
4.6 Radiation based estimation of the plasma temperature 52
4.6.1 Theoretical estimates of axial temperature 52
4.6.2 Temperature gradients due to radiation diffusion 52
4.7 Radiation loss from large diameter arcs 53
4.8 An explanation for the voltage gradient 55
4.9 Conclusions concerning radiation power of furnace arcs 55
5 Arc terminations in steelmaking furnaces 56
5.1 Measurements of current density for graphite and steel terminations 56
5.2 Power balance at the anode spot on graphite 58
5.3 Analysis of the spots on steel terminations 59
5.4 Electrode consumption data for short duration arcs on graphite and steel 60
5.5 Power balance at the electrode spots on solid steel 61
5.6 The cathode spot on liquid steel 63
6 Magnetic fields and forces in arc furnaces 64
6.1 Magnetic force on AC furnace arcs and electrodes 64
6.1.1 Magnetic force on the arc due to a finite sized liquid steel bath 66
6.1.2 Summary of fields 67
6.1.3 Deflection during scrap boredown 68
6.2 Magnetic force on the arc in a mono-electrode DC furnace 68
6.2.1 Arc deflection correction for mono-electrode DC 69
6.2.2 Boredown 70
6.3 Conclusion on arc deflection 70
6.4 The Lorentz force in a bent arc column 70
6.5 Skin and proximity effects 71
6.6 Magnetic field shielding due to scrap 72
6.7 Proximity effect in furnace electrodes 74
6.8 Torque on electrodes in an AC furnace 75
6.9 Magnetic fields around AC and DC furnaces 75
7 Arc instabilities 77
7.1 Observed arc instabilities 77
7.2 Reasons for arc movement 77
7.2.1 Instability due to cathode spot crater growth 78
7.2.2 Asymmetrical conductivity near the cathode spot 78
7.2.3 Arc jumping over pieces of scrap 78
7.2.4 The scrap termination effect 79
7.2.5 Effect of DC tip shape 80
7.2.6 Arc plasma instabilities 80
7.3 The helical rotation of the arc column 80
7.3.1 Frequency of arc rotation 81
7.3.2 Instability of very long arcs 81
7.4 Aerodynamic instabilities 81
7.4.1 Reynold s number for an arc 81
7.4.2 Turbulence in the arc column 82
7.4.3 The stabilising effect of the plasma jet 83
7.5 Rates of change of arc voltage in AC furnaces 84
7.6 Effect of slag 85
8 The electric circuit of arc furnaces 86
8.1 The AC circuit 86
8.1.1 Magnetic fields and reactance 88
8.1.2 Reactance in the three-phase circuit 89
8.1.3 Effective phase reactance of a three-phase circuit 89
8.1.4 Reactance calculation 90
8.1.5 Equivalent reactance 91
8.1.6 Measurement of phase reactance 92
8.1.7 Actual furnace reactances 93
8.2 The DC arc furnace power circuit 93
8.2.1 Six-pulse rectifier system 93
8.2.2 Line current in a 12-pulse system 96
8.2.3 18-pulse and 24-pulse systems 97
8.2.4 Electrical characteristics of the DC furnace 98
8.2.5 Active-reactive power characteristic 98
9 Electrical performance of the arc furnace circuit 100
9.1 Measurable parameters 100
9.1.1 Voltage and current 100
9.1.2 Power 101
9.1.3 Three-phase induction meters 101
9.1.4 Definition and measurement of reactive power 102
9.1.5 Measurement of reactive power with a kVarh meter when harmonics exist 102
9.1.6 Alternative definition of reactive power 103
9.2 The measurement of arc voltage 103
9.2.1 Magnitude of the induced error voltage 104
9.2.2 Effect of mast height variations 105
9.2.3 Variables that affect performance 106
9.2.4 Effect of unsteady arc voltage 107
9.2.5 Effect of power factor on current waveform 108
9.3 The three-phase arc furnace circuit 109
9.3.1 The third harmonic 109
9.3.2 Easier passage through current zero 110
9.4 Electrical characteristics during operation 110
9.4.1 Establishing the arcs 110
9.4.2 Variation of parameters through a heat 111
9.4.3 Electrical measurements on arc furnaces: dimensionless relations 111
9.4.4 Relationship between active and reactive power 114
9.5 Unbalanced conditions in the three-phase AC circuit 115
9.5.1 Range of arc voltage and current imbalance 116
9.5.2 The three-dimensional operating space of arc voltage 118
9.6 Modelling of the electrical operation 118
9.6.1 Arc as a linear ohmic resistance 118
9.6.2 Rectangular arc voltage waveform 119
9.6.3 Cassie (circuit breaker) models 120
9.6.4 Arc voltage as a system of harmonics 121
9.6.5 The operating or arc reactance model 123
9.6.6 The measurement and definition of operating reactance 124
9.6.7 The measurement of the arc reactance 125
9.6.8 Relation of operating reactance to power factor 126
9.6.9 An empirical link between the arc reactance and the arc resistance 126
9.6.10 Asymmetrical arc voltage swings with harmonics 126
9.6.11 Misfiring 128
9.7 Summary 128
10 Physical characteristics of steel scrap 129
10.1 A tube model for scrap 129
10.1.1 Packing characteristics 129
10.1.2 Tubes 130
10.1.3 Number of contacting neighbours 130
10.1.4 Current flow between pieces 130
10.1.5 Contact shape and pressure 131
10.1.6 Resistance 131
10.1.7 The effective resistivity of scrap consisting of tubes 134
10.2 Results using the tube model 134
10.2.1 Effect of scrap size and aspect ratio 134
10.2.2 The effect of temperature on effective resistivity 135
10.2.3 Magnetic properties of scrap 135
10.2.4 The skin depth in scrap 137
10.2.5 Application to other shapes of scrap 138
10.3 DC furnaces 138
10.4 Scrap impedance 138
11 The meltdown process 140
111 Heat transfer arc to charge 140
11.1.1 Partition of melting time: Arcing directly to scrap or to liquid 140
11.1.2 Heat transfer to solid steel arc terminations 140
11.1.3 Heating by the impact of the plasma jet 141
11.1.4 Normal impact of the arc against a steel plate 142
11.1.5 Heat transfer from an angled arc plasma jet 144
11.1.6 Heat transfer to a bar 145
11.1.7 Summary of heat transfer to a steel plate 146
11.1.8 Radiation exchange between the arc and the charge 146
11.2 Heat transfer from arc to liquid 146
11.2.1 Jet impact onto a liquid 146
11.2.2 Jet impact onto a liquid covered with a lighter layer ( slag covered steel ) 147
11.3 Splashing by the arc as a heat transfer mechanism 147
11.3.1 Splash modes 148
11.3.2 Splashing rates 148
11.3.3 Splash distribution and momentum 149
11.3.4 Size distribution of splash drops 150
11.3.5 Splashing by an arc 150
11.3.6 Liquid depression transient 151
11.3.7 Splashing due to a mobile arc 151
11.3.8 Splash rates due to the arc 153
11.3.9 Heat transfer due to splashing 154
11.4 The general scrap meltdown pattern 154
11.4.1 Process stages 154
11.4.2 Diameter of the boredown pit 155
12 Liquid bath phenomena 158
12.1 Stirring in arc furnaces 158
12.1.1 Current distribution and self-magnetic stirring 158
12.1.2 Stirring by the current in DC furnaces 158
12.1.2 Velocity measurements in electromagnetically pumped liquid metals 159
12.2 Stirring forces 160
12.2.1 Lorentz force in AC furnaces 160
12.2.2 Lorentz force in DC furnaces 161
12.2.3 Comments on Lorentz force for AC and DC 162
12.3 Stirring due to arc jet 162
12.4 Heat transfer due to electromagnetic pumping 163
12.5 Depressions in the liquid due to the arc jet 163
12.6 Electrode lifting from short circuit 164
12.7 Lifting of the bath surface by CO bubbles 165
12.8 Effect of CO bubbles on arc length 166
13 Slag effects in arc furnaces 167
13.1 Effect on arc stability 167
13.2 The effect of foaming slag on furnace operation 167
13.3 Detection of arc burial by foaming slag 168
13.3.1 Reference signal 169
13.3.2 Thermal status of water-cooled panels 169
13.3.3 Bath level measurement 169
13.3.4 Light emission 169
13.3.5 Electrical characteristics 170
13.3.6 Sound emission 171
13.3.7 Vibrations of the furnace shell 171
13.3.8 Use of the slag signal 172
13.4 Slag coating on water-cooled panels 172
13.5 Slag properties and arc existence 173
13.6 Current through foaming slag 175
14 Mechanics of the secondary system 176
14.1 Vibrations and damping 176
14.2 Forced vibrations of an electrode column 177
14.2.1 Natural (Eigen-) frequencies 178
14.2.2 Response of the column to a cyclic driving force 178
14.3 Electromagentically forced vibrations of the secondary system 179
14.3.1 Magnitude of the electromagnetic forces 180
14.3.2 Deflection of the electrode/arm/mast system 182
14.3.3 Response of the electrode/arm/mast system to cyclic forces 182
14.3.4 Calculated resonant frequencies 183
14.3.5 Resonant frequencies measured on arc furnaces 183
14.3.6 Rotation of the electrode tip 185
14.4 Forces occurring during furnace operation 185
14.4.1 Examples of forces generated during scrap melting 185
14.4.2 Resonant conditions observed on some arc furnaces 186
14.4.3 Avoidance of resonance 187
14.4.4 Comments on modes of vibration 187
14.5 Vibrations due to movement of the mast 187
14.5.1 Electrode arm vibrations 187
14.5.2 Hydraulic system vibrations 188
14.6 Motion of the secondary of DC furnaces 190
14.7 Secondary mechanics and regulation 190
15 Power control of arc furnaces 191
15.1 Electrode regulation 191
15.1.1 General requirements 191
15.1.2 Controlled System 193
15.1.3 The importance of secondary dynamics 195
15.1.4 Controlled variable 196
15.1.5 Control strategy 198
15.2 Optimising electrode movements 200
15.2.1 A criterion for judging regulation performance 200
15.2.2 A computer model 200
15.3 Superposed power control 202
15.3.1 Transformer tap control 203
15.3.2 Reactor tap control 205
15.4 Ladle Furnace requirements of the regulation system 206
16 Heat transfer properties of fume in the arc furnace 208
16.1 Fume formation mechanisms 208
16.2 Fume generation rates in steelmaking furnaces 209
16.2.1 Identity of fume particles inside the arc furnace 210
16.2.2 Size distribution of fume particles 211
16.2.3 Fume generated by hand held metal cutting tools 212
16.2.4 Sectional area of fiime 213
16.3 Absorption and scattering of radiation by fume 214
16.3.1 Absorption efficiency and depth 214
16.3.2 Significance of absorption and extinction depths 216
16.3.3 Role of fume in heat transfer 216
16.4 Power transfer bath to furnace without fume 217
16.5 Heat transfer during foaming slag or DRI operation, with/without post combustion 217
17 Noise from arc furnaces 220
17.1 Loudness and power 220
17.2 Sound emission of AC furnaces 221
17.2.1 Measurements around arc furnaces 221
17.2.2 Measurements of sound pressure level near furnaces 222
17.2.3 Total power emitted outside the furnace 222
17.2.4 Acoustic power within the furnace 223
17.3 Sound emission of DC furnaces 223
17.4 Mechanisms of noise generation 224
17.4.1 Acoustic model 224
17.4.2 Reduction of noise through the heat 225
17.4.3 Noise in the harmonics of the AC furnace (pulsating cylinder) 226
17.4.4 Sound emission due to sideways displacements of the arc 227
17.4.4 Broadband noise 227
17.4.5 Turbulent jet noise 228
17.4.6 Influence of the electrical operating point 229
17.5 Acoustic power in the meltshop 230
18 References 231
19 Appendix 243
19.1 Properties of steel 243
19.2 Properties of graphite 244
19.3 References (Appendix) 245
|
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| id | DE-604.BV036051262 |
| illustrated | Illustrated |
| indexdate | 2024-07-09T22:10:19Z |
| institution | BVB |
| isbn | 9783514007680 |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-018942941 |
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| physical | XIX, 247 S. Ill., graph. Darst. 25 cm |
| publishDate | 2009 |
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| publisher | Verl. Stahleisen |
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| series2 | Stahleisen communications |
| spelling | Bowman, Ben Verfasser aut Arc furnace physics Ben Bowman ; Klaus Krüger Düsseldorf Verl. Stahleisen 2009 XIX, 247 S. Ill., graph. Darst. 25 cm txt rdacontent n rdamedia nc rdacarrier Stahleisen communications Literaturverz. S. 231 - 242 Lichtbogenofen (DE-588)4167576-9 gnd rswk-swf Lichtbogenofen (DE-588)4167576-9 s DE-604 Krüger, Klaus Verfasser aut HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018942941&sequence=000004&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Bowman, Ben Krüger, Klaus Arc furnace physics Lichtbogenofen (DE-588)4167576-9 gnd |
| subject_GND | (DE-588)4167576-9 |
| title | Arc furnace physics |
| title_auth | Arc furnace physics |
| title_exact_search | Arc furnace physics |
| title_full | Arc furnace physics Ben Bowman ; Klaus Krüger |
| title_fullStr | Arc furnace physics Ben Bowman ; Klaus Krüger |
| title_full_unstemmed | Arc furnace physics Ben Bowman ; Klaus Krüger |
| title_short | Arc furnace physics |
| title_sort | arc furnace physics |
| topic | Lichtbogenofen (DE-588)4167576-9 gnd |
| topic_facet | Lichtbogenofen |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018942941&sequence=000004&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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