Gasification

Gas Liquor Treatment

The gas liquor from the quench cooler typically contains the elements outlined in Table 5-3 (Supp 1990).

There are a number of alternate strategies for handling this material. Lurgi has developed two specific processes for treating it, in particular for allowing the recov­ery of pure ammonia.

Table 5-3

Gas Liquor Composition

Suspended Matter

1000

mg/l

Sulfur

600

mg/1

Chloride

50

mg/l

NH3 and NH4 ions

10,000

mg/1

Cyanide

50

mg/l

Phenols

1000-5000

mg/1

COD

10,000

mg 02/l

Source: Supp 1990

SOUR GAS

TAR RAW PHENOL WASTE WATER

Figure 5-4. Gas Liquor Treatment for Lurgi Dry Ash Gasification

The process sequence (Figure 5-4) includes mechanical tar separation, followed by the Phenosolvan extraction process in which a raw phenol fraction is recovered. Sour gases and ammonia are then selectively and separately stripped from the dephenolated condensate in the CLL (Chemie Linz-Lurgi) unit. The sour gas stream is free of ammonia and so suitable for processing in a standard Claus sulfur recovery unit (see Section 8.4). The stripped condensate contains less than 50ppm NH3 and less than 1 ppm H2S and can be discharged to a biotreater. The ammonia product from the CLL unit contains less than 4% water, less than 0.1 wt% C02, and less than lppm H2S. Further details on these processes can be found in Supp (1990) and Stonner (1989).

Gasification

Liquid Wastes

Organic Chemical Waste. Organic wastes from chemical production vary as widely as the processes from which they originate. One published example is the feedstock to a waste gasification plant at …

Carbon Management

In the Texaco process, soot is extracted from the carbon-water mixture with naphtha and recycled with the feedstock to the reactor where it is gasified to extinction. The black water …

Common Issues

Operating Temperature Any fluid bed depends on having the solid particles of a size that can be lifted by the upward flowing gas. A large portion (over 95%) of the …

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