**4. Results**

#### *4.1. Analysis of the Composition of the Filtration Cake*

The solid pollutants were carefully removed mechanically from its outer surface. The sample of SP was tested by thermogravimetric analysis—see Figure 4—until 100 ◦C 1.5% by wt. was released into the stream of carrier gas, until 200 ◦C about 2.5% by wt., until 300 ◦C about 7.5% by wt., and until 400 ◦C about 8% by wt. The simultaneously performed DTA analysis found that there is only one

significant endothermal effect, detected at approximately 725 ◦C. This effect is probably the melting of the inorganic fraction of the filtration cake.

**Figure 4.** Thermogravimetric analysis (TG)/DTA analysis of filtration cake.

The quantity of ash in the SP sample determined by its combustion at 850 ◦C was 37.28% by wt. The quantity of carbon dioxide in the sample determined using HCl corresponding to the detected carbonates was 2.7% by wt.

#### *4.2. Composition of Inorganic Fraction and SP Size of the Filtration Cake*

The results of the composition of the filtration cake inorganic fraction were performed using fluorescent X-ray analysis and are summarized in Table 5.


**Table 5.** Composition of the filtration cake inorganic fraction.

Measurement of the distribution of trapped particle size was performed for samples taken in the middle of four sleeves using the laser technique Analysette. The results are shown in Table 6. Particle sizes were in the range of 10 μm to 3 mm.


**Table 6.** Cumulative particle size distribution of SP trapped by filtration cake.

#### *4.3. Analysis of Organic Substances Trapped by Filtration Cake*

The next part of the research work was related to the identification and quantification of the components trapped in the filtration cake by the sleeves (Table 7).




1


**Table 7.** *Cont.*

this group includes other substances from the BTX and alkylbenzenes group. 2 together with fluorantene also includes fenantrylene M = 202 eluted from GC column immediately after it. 3 together with pyrene also includes aceantrylene M = 202 eluted from GC column immediately before it. \* benzofurane, dibenzofuranes, methylbenzofuranes, naphtobenzofuranes. \*\* benz[c]fenanthrene, benzo[ghi]fluorantene,3,4-dihydrocyclopenta[cd]pyrene, cyclopenta [cd]pyrene. \*\*\* benzo[j]fluoranthene,benzo[k]fluoranthene,benzo[e]pyrene,benzo[a]pyrene,perylene. \*\*\*\* indeno [1,2,3-cd]pyrene,dibenzo[a,h]antracene,benzo[ghi]perylene,dibenzo[def,mno]chrysene and other PAH with M = 278–302.

#### *4.4. Chemical Composition of Incrust*

The composition of the incrust (Figure 5) shown in Table 8, where the concentration of the 16 most significant components from the 79 monitor elements is shown.

**Figure 5.** Incrust from the grate section of generator.

**Table 8.** Incrust composition.


Evaluation of X-ray diffraction analysis assessing only the composition of the crystalline phase of the incrust is shown in Table 9.


**Table 9.** X-ray diffraction analysis results.
