Slurry coating

Kawada T, Sakai N, Yokokawa H, Dokiya M, Mori M, and Iwata T. Characteristics of slurry-coated nickel zirconia cermet anodes for solid oxide fuel cells. J Electrochem Soc 1990 137 3042-3047. 

Fuel electrode Ni-Zr02(Y2Q3) 100 pm Slurry coat-electrochemical vapour deposition... 

Figure 4.109 Slurry coating of a continuous micro structured foil [109].

FIGURE 24 SEM images of y-Al20j slurry-coated cordierite monolith (400 cpsi). (A) Cross-sectional view of channel wall (center, cordierite support right, washcoat layer right side, steep edge of washcoat on wall) (B) top view of coating on walls. 

The same slurry-coating method is applicable to catalyst particles, and the same reasoning holds for an optimal particle size. Different is the impact of fhe use of binder material. 

Fig. 28 Two-dimensional schematic of the microstructure of a slurry-coated cermet anode.

Furthermore, slurry-coated cermet anodes have various long-term stability problems, particularly due to the fine particle size of the metallic component.It has also been reported that the tolerance for impurities in fuels is very limited. High levels (100 ppm) of H S may cause significant irreversible performance loss due to anode poisoning. 

Our research shows that in terms of effectiveness and economics the most promising environmental control technology (ECT) for dealing with high-sulfur coal wastes from the United States consists of sequential slurry coating of the waste with lime and limestone. In the eonfiguration tested (0.35% lime and 1.1% limestone), this technique controlled the waste effluent quality for 4 months. The effluent pH remained between 7.3 and 7.6, and the trace element concentrations (aluminium, calcium, manganese, iron, cobalt, nickel, and copper) were within acceptable limits. This treatment offers a potentially viable approach disposal of these wastes. 

Costs of 10 alternative ECTs were calculated for three hypothetical and three actual coal-cleaning plants, and the cost of lime-limestone slurry coating was analyzed. 

Option 10. Lime-Limestone Slurry Coating of Waste Before Disposal. One major... 

Option 10. Lime-Limestone Slurry Coating. Capital cost for this option was calculated to be 601 600 and essentially independent of plant throughput in the range here considered. The operating expense, other than materials, is also independent of throughput. Lime and limestone cost is a function of the tonnage and not the composition of waste. The data in the tables are based... 

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