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)
Partial stream conversion
Heat oil / Natural gas (if need)
own consumption or electricity sale
1 × Fly stream gasifier (entrained flow gasification)
Liquid waste, e.g. tar, oil
Electricity Steam own supply SVZ
[ SVZ, Fig. /Transf. ERT ]
<Fig. 2> Flow-Chart of SVZ-Plant
The characteristics of the three different gasifiers are summarized in the following table:
12 - 15
1.200 - 1.300 °C
1.600 - 1.800 °C
quantity at SVZ flow-rate t / h temperature operating pressure gasification agent
[Tab. 3] Gasifier of SVZ-Plant
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.