Feed moisture

Fig. 3. Effect of feed moisture content on energy available for synfuel production. Assumes feed has a heating value of 11.63 MJ /kg (5000 Btu/lb) dry. A, 0% moisture in dried feed B, 30% moisture in dried feed. For example, reduction of an initial moisture content of 70 wt % by thermal drying to 30% moisture content requites the equivalent of 37% feed energy content and leaves 63% feed energy available for SNG production.

The control system requires the values of T and AT obsei-ved during the first minutes of operation to be stored as the basis for the above calculation of end point. When the exhaust temperature then reaches the value calculated, diying is terminated. Coefficient K can be estimated from models but requires adjustment on-hne to reach product specifications repeatedly. Products having different moisture specifications or particle size will require different settings of K, but the system does compensate for variations in feed moisture, batch size, air moisture, and inlet temperature. Some exhaust air may be recirculated to control the dewpoint of the inlet air, thereby consei-v-ing energy toward the end of the batch and when the ambient air is especially diy. 

The physical properties of the feed moisture, viscosity, density, etc. 

Method of Feed Moisture Content, (% Wet Basis) Steam Pressure, (Ib/sqin.) Drum Speed (rpm) Feed Temp. (°F) Capacity [lb product/ (hr)(sq ft)) Vacuum (in. Hg)... 

The aim of this study was the assessment of the effect of the particle size distribution of raw material and feed moisture content on the energy required for the transformation of powder material into granulated product of de-... 

Fig. 4 shows examples (for raw material D2) of the effect of feed moisture content w on the energy necessary to produce granulated material of specified mean particle diameter. 

Occurrence of these two granulation periods and the impact of feed moisture content on their duration are confirmed by the present studies. 

An example of energy input necessary for unit growth of the mean agglomerate size for different feed moisture content is shown in Fig. 5. 

The effect of mean particle size of raw material and feed moisture content on energy input AEn related to unit increment of mean particle size A<7gm on the whole stage of granulation (from tg = 0 to tg = fgmax) is described with good accuracy (R = 0.96) by the power function of two variables ... 

Exponents in the obtained equation reveal a remarkable effect of the feed moisture content and mean particle size diameter of the raw material on energy input for the increment of granule size. 

The effect of mean particle diameter of the raw material and feed moisture content on energy input as related to unit... 

Feed and Exit Solids Moisture Content These need to be measured using an appropriate technique, as described above. Use the same method for both the feed and exit solids. Don t rely on formula sheets for feed moisture information. 

---