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Dr.-Ing. Rolf Berghoff, Dr.-Ing. J. G. Kim / ERT-Consulting - page 5 / 9

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chromium copper nickel mercury zinc t in cyanide polychlorinated biphenyls chlorine / halogenide Dioxine / Furane

[micro g /kg]

20,000 200,000 50,000 200 100,000 50,000 500 500 10 50

It shows that the gasification process with efficient gas cleanup is very flexible regarding high pollutant contents in the wastes. The SVZ-Plant is a recycling plant, which is equipped however with the efficient gas purification system of the waste incineration plants and which keeps the strict emission- values.

Liquid waste

Synthesis gas

Methanol

50,000 t

380 Mio. Nm3

80,000 t

To time 15 % coal and 85 % wastes are treated in the plant. The energetic efficiency for the methanol production is difficult to determine. After a report of the ZSW (Centre for Solar power and Hydrogen Research, Germany) from August 2004 it is approx. at 50 %. In the same report also costs for the methanol production with the SVZ are mentioned. They are estimated on 150, - to 180, - EUR/t methanol.

Steam

Output or Product

Electricity 360, 000 MWh

Solid waste 300,000 t

Slag

Mass of Input Material

Coal 62,000 t

Ä

Source: SVZ/ UFOP , Fig. Add.: ERT

< Fig.1 > Input material and production flows of SVZ in 2003

In the gasification plant different systems are used:

  • 5 solid-bed pressure gasifier (capacity for each gasifier 15 t/h)for solid wastes,

  • 1 British-Gas/Lurgi (BGL) slag-bed gasifier (capacity 35 t/h) for solid wastes,

  • 2 fly stream gasifier (capacity for each gasifier 16 t/h) for liquid and pasty wastes.

The gasification in the reactor is run with steam/oxygen mixtures at high process temperatures, high pressure and in reducing atmosphere. Thereby all hydrocarbons up to the molecular level are split independently of kind of refuse or fluctuations in the composition. By the conditions of the reaction (high temperatures and shock cooling of the synthesis gas) all organic pollutants (dioxins and furane, polycyclic aromatic hydrocarbons, Biphenyle, and A.) are completely destroyed. The heavy metals are fixed in the slag of the solid residues, and this will prevent any leaching.

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