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Dr.-Ing. Rolf Berghoff, Dr.-Ing. J. G. Kim / ERT-Consulting - page 7 / 9

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BGL(British gas - Lurgi)-Gasifier or Slag bed gasifier (SBG)

System parameter and technical data of SBG:

¾System parameter

  • Diameter: 3.6 m

  • Operating pressure: 25 bar

  • water coolant of double coat etc.

<Fig. 3 >

¾ Technical data

  • Throughput: 27 – 32 t/h

  • Gas amount: 35 000 Nm_/h

  • Gasification end temperature: 1 600 °C

  • Steam amount: 6 –9 t/h

  • Oxygen amount: 6 000 Nm_/h

  • Slag throughput: 7.5 t /h

  • Raw gas temperature: 500-700 °C

  • Temperature after cleaning < 200 °C

[ SVZ ]

Slag bed gasifier (SBG) or BGL of SVZ

Mass- and energy balance SVZ :

At the example of the gasification of 1 Mg plastic waste (carbon content approx. 70 %; Hu = 33.7 MJ/kg) data of the mass- and energy flows are to be given:

Substance

kg

%

Substance

kg

%

Substance

kg

%

Scrap plastics

1000

40.7

Synthesis gas

861

35.1

*Methanol

596

24.3

[Tab. 4 ] Mass balance / - flows at the gasification of scrap plastics

(Incl. carbon 700kg) Oxygen Chemical

517 120

21.1 4.9

Relax gas

1266

51.6

Water

817

33.3

Others (slag, waste water)

327

13.3

Input substance for Gasification

Output (products)

Interim output (products)

Final output (products)

Pure gas

265

10.8

Waste gas &

1266

51.6

Exhaust, others

slag

182

7.4

Waste water

145

5.9

Input of Energy

Products of energy

Efficiency

Criteria

MWh

Criteria

MWh

%

Methanol

3.31

35.4

Electric current

0.98

10.4

Heating energy

0.28

3.0

4.57

48.8

[Data source: SVZ, Tab.

: Berghoff, Kim / ERT]

2454

100

.: Berghoff, Kim / ERT]

[Tab. 5 ] Energy flows at the gasification of plastic waste

9.36

9.36

[Data source: SVZ, Tab

Scrap plas + others

Total

tics

Total

2454

100

2454

100

  • *

    Methanol: 99.08 purity, ca. 226 kg carbon, HuCH3OH

= 19,7 MJ / kg

  • -

    7-

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