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Dr.-Ing. Rolf Berghoff, Dr.-Ing. J. G. Kim / ERT-Consulting - page 6 / 9

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The produced synthesis gas is transformed in a separate process to methanol. Contaminated rest- gases coming from the gasification process (approx. 5-10 % of the total amount) and Purgegas from the methanol production are converted to energy and electricity over a boiler and a gas turbine. The electricity will be sold - after deduction of the necessary quantity for the internal requirement of the plant - to general electricity mains.

Solid waste, coal, SLF-Pellets etc.

Boiler with REA

5× Solid-bed pressure gasifier 1 × Slag bath gasifier(SBG)

Rohgas/25bar

Relax gas

Gas cleaning

Synthesis gas

Slag

Safety reactor

Partial stream conversion

Compressor

Gipsum

Heat oil / Natural gas (if need)

Steam (125bar/525°C)

Gas turbine

Electricity

Deheating boiler

own consumption or electricity sale

Steam (125bar/525°C)

Steam turbine

1 × Fly stream gasifier (entrained flow gasification)

Raw gas/25bar

45bar

Slag

Liquid waste, e.g. tar, oil

Methanol- synthesis

Purge gas

Electricity Steam own supply SVZ

Methanol- destillation

Methanol(99.85 degree)

[ SVZ, Fig. /Transf. ERT ]

<Fig. 2> Flow-Chart of SVZ-Plant

The characteristics of the three different gasifiers are summarized in the following table:

Solid-bed pressure

Fly-stream

Slag-bed

5

2

1

12 - 15

15

35

1.200 - 1.300 °C

1.600 - 1.800 °C

1.450 °C

25 bar

25 bar

25 bar

quantity at SVZ flow-rate t / h temperature operating pressure gasification agent

steam, O2

solid residues

sintered slag

[Tab. 3] Gasifier of SVZ-Plant

Gasifier

steam, O2

steam, O2

molten slag

molten slag

The special advantages of the waste gasification are:

  • The solid residues are transformed into a molten slag.

  • The heavy metals contained in the wastes cannot any more be eluted.

  • The gasifiers are small and compact aggregates.

  • They can start and shut down very fast.

  • There are very small emissions in the off-gas because of the nearly complete destruction

of toxic materials during the process.

The slag-bed gasifier is of special interest. It is the further development of a gasifier used by the companies British-Gas und Lurgi for coal gasification. The apparatus was scaled up and adapted to the specific requirements of a waste gasification. There are other special developments, so the waste- feed-system as well as the slag discharge, which is heated over a ring burner to make a liquid slag possible. The gasifier is since the year 2003 in large-scale operation.

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