Gasification

Process Performance

A comparison between the performance of the Lurgi dry ash and the BGL gasifier is given in Table 5-5.

The much lower steam and somewhat lower oxygen consumption of the slagging gasifier result in a much higher syngas production per unit of coal intake and a much lower yield of pyrolysis products compared with the dry bottom unit. Further, the C02 content of the gas is lower and the methane content in the gas is halved.

Table 5-5

Comparative Performance of Lurgi Dry Ash, BGL, and Ruhr 100 Gasifiers

Raw Gas

Composition (Dry)

Dry Ash Gasifier

Slagging

Gasifier

Ruhr 100 90 Bar Carb. Gas

Ruhr 100 90 Bar Clear Gas

C02, mol%

30.89

3.46

29.52

35.47

CO, mol%

15.18

54.96

18.15

17.20

H2, mol%

42.15

31.54

35.11

39.13

CH4, mol%

8.64

4.54

15.78

7.93

CnHm, mol%

0.79

0.48

1.02

0.04

N2, mol%

0.68

3.35

0.35

0.19

H2S + COS, mol%

1.31

1.31

NH3, mol%

0.36

0.36

Feed components per

1000Nm3 CO+H2

Coal maf, kg

750

520

Steam, kg

1930

200

Oxygen, Nm3

280

230

kg pyrolysis

products/1000kg coal

81

19

Source: Supp 1990; Lohmann and Langhoff 1982

Waste Gasification

As mentioned above, the BGL gasifier has found a commercial application in waste gasification at the SVZ Schwarze Pumpe plant near Dresden in Germany. A 3.6m diameter BGL gasifier is fed with a mixed fuel of various wastes and coal. During test operation the unit has gasified a mixture of 25% hard coal, 45% refuse derived fuel (RDF) pellets, 10% plastic waste, 10% wood, and 10% tar sludge pellets.

During the performance test the following production and consumption figures were achieved (Greil etal. 2002):

Mixed Fuel (ar)

30

t/h

Specific oxygen consumption

<0.2

Nm3/Nm3 dry syngas

Gasification agent ratio steam/oxygen

<1.0

kg/Nm3 dry syngas

Raw syngas (dry)

31,500

Nm3/h

Gasification pressure is 25 bar. The ash content of the feed is discharged as a glassy frit. Analytical tests have demonstrated the nonleachability of the slag, and that disposal requirements, according to ТА Siedlungsabfall, class 1 (German waste regu­lations), have been met.

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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