combustion cycles. Herein, Fe2O3/Al2O3 OC mixed with ash will produce  terjemahan - combustion cycles. Herein, Fe2O3/Al2O3 OC mixed with ash will produce  Bahasa Indonesia Bagaimana mengatakan

combustion cycles. Herein, Fe2O3/Al

combustion cycles. Herein, Fe2O3/Al2O3 OC mixed with ash will produce a certain chemical reaction and aggregation, leading to inactivation of Fe2O3/Al2O3 OC.
The conversion after the first cycle calculated from Fig. 6, a value of a = 44.56% was compared with value of a = 24.9% reported
by Wang et al. [12] who introduced Al2O3 to Fe2O3, which shown the value of a increased 20%. Additionally, SO2 contributes to
improve the high reactivity of OC, although iron silicates such as FeSiO3 are not observed based on the XRD analysis. The oxidation of FeSiO3 by O2 is very easy and the iron silicate is oxidized back to SiO2 and Fe2O3, which are shown in Figs. 9 and 10.
2Fe2O3 + 4SiO2 = 4 FeSiO3 + O2 (R1)
Fe2O3 + 2SiO2 + CO = 2FeSiO3 +CO2 (R2)
Fe3O4 + 3SiO2 + CO = 3FeSiO3 + CO2 (R3)
4FeSiO3 + O2 = 2Fe2O3 + 4SiO2 (R4) Yet, a = 24.37% and a = 11.39 is obtained after five cycles and ten cycles, respectively. Wang et al. [38] experimented the reactivity of Fe2O3/Al2O3 oxygen carriers prepared by sol–gel combustion with coal at the ratio coefficient K = 1, and their results showed that
FeAl2O4 generated in combustion process for the sake of introducing Al2O3. Herein, due to the more Fe2O3 with temperature
decreasing further react with Al2O3, and Al2O3 significantly impeded Fe3O4 and FeO sufficient oxidative regeneration with air, leading to a decreaseof activity of Fe2O3/Al2O3 oxygen carrier. According to these analyses, the reactivity and conversion rate of Fe2O3/Al2O3 OC prepared from the metallurgy iron bearing dust increased by introduction of Al2O3 to Fe2O3.
The conversion rate of coal decreased with the increasing cycle numbers, this is mainly caused by the introduction of inert carrier Al2O3 through traditional mechanical method to mix with Fe2O3, which can be prevented fully to contact with coal and response to play a certain extent inhibition for coal conversion. Yet, based on the results of the analysis of surface properties, the interface Fe2O3/Al2O3 prepared by coprecipitation exhibits more uniform, a larger number of holes and large specific surface area, which maybe the surface atoms of Fe2O3/Al2O3 with hanging unsaturated reactive atom bond causing higher chemical reactions [39]. With the cycles increasing, however, more and more coal ash is accumulated with Fe2O3/Al2O3 OC, which can cause the coal to react with Fe2O3/Al2O3 OC to produce a certain silicate component in CLC. In addition, the agglomeration effect between coal ash and Fe2O3/Al2O3 OC can reduce the reactive contact surface of pulverized coal, thus leading to the reactivity deterioration of Fe2O3/Al2O3 OC.
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combustion cycles. Herein, Fe2O3/Al2O3 OC mixed with ash will produce a certain chemical reaction and aggregation, leading to inactivation of Fe2O3/Al2O3 OC.The conversion after the first cycle calculated from Fig. 6, a value of a = 44.56% was compared with value of a = 24.9% reportedby Wang et al. [12] who introduced Al2O3 to Fe2O3, which shown the value of a increased 20%. Additionally, SO2 contributes toimprove the high reactivity of OC, although iron silicates such as FeSiO3 are not observed based on the XRD analysis. The oxidation of FeSiO3 by O2 is very easy and the iron silicate is oxidized back to SiO2 and Fe2O3, which are shown in Figs. 9 and 10.2Fe2O3 + 4SiO2 = 4 FeSiO3 + O2 (R1)Fe2O3 + 2SiO2 + CO = 2FeSiO3 +CO2 (R2)Fe3O4 + 3SiO2 + CO = 3FeSiO3 + CO2 (R3)4FeSiO3 + O2 = 2Fe2O3 + 4SiO2 (R4) Yet, a = 24.37% and a = 11.39 is obtained after five cycles and ten cycles, respectively. Wang et al. [38] experimented the reactivity of Fe2O3/Al2O3 oxygen carriers prepared by sol–gel combustion with coal at the ratio coefficient K = 1, and their results showed thatFeAl2O4 generated in combustion process for the sake of introducing Al2O3. Herein, due to the more Fe2O3 with temperaturedecreasing further react with Al2O3, and Al2O3 significantly impeded Fe3O4 and FeO sufficient oxidative regeneration with air, leading to a decreaseof activity of Fe2O3/Al2O3 oxygen carrier. According to these analyses, the reactivity and conversion rate of Fe2O3/Al2O3 OC prepared from the metallurgy iron bearing dust increased by introduction of Al2O3 to Fe2O3.The conversion rate of coal decreased with the increasing cycle numbers, this is mainly caused by the introduction of inert carrier Al2O3 through traditional mechanical method to mix with Fe2O3, which can be prevented fully to contact with coal and response to play a certain extent inhibition for coal conversion. Yet, based on the results of the analysis of surface properties, the interface Fe2O3/Al2O3 prepared by coprecipitation exhibits more uniform, a larger number of holes and large specific surface area, which maybe the surface atoms of Fe2O3/Al2O3 with hanging unsaturated reactive atom bond causing higher chemical reactions [39]. With the cycles increasing, however, more and more coal ash is accumulated with Fe2O3/Al2O3 OC, which can cause the coal to react with Fe2O3/Al2O3 OC to produce a certain silicate component in CLC. In addition, the agglomeration effect between coal ash and Fe2O3/Al2O3 OC can reduce the reactive contact surface of pulverized coal, thus leading to the reactivity deterioration of Fe2O3/Al2O3 OC.
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siklus pembakaran. Di sini, Fe2O3 / Al2O3 OC dicampur dengan abu akan menghasilkan reaksi kimia tertentu dan agregasi, menyebabkan inaktivasi Fe2O3 / Al2O3 OC.
Konversi setelah siklus pertama dihitung dari Gambar. 6, nilai a = 44,56% dibandingkan dengan nilai a = 24,9% dilaporkan
oleh Wang et al. [12] yang memperkenalkan Al2O3 untuk Fe2O3, yang menunjukkan nilai dari peningkatan 20%. Selain itu, SO2 kontribusi untuk
meningkatkan reaktivitas tinggi OC, meskipun silikat besi seperti FeSiO3 tidak diamati berdasarkan analisis XRD. Oksidasi FeSiO3 oleh O2 sangat mudah dan silikat besi teroksidasi kembali ke SiO2 dan Fe2O3, yang ditunjukkan pada Gambar. 9 dan 10.
2Fe2O3 + 4SiO2 = 4 FeSiO3 + O2 (R1)
Fe2O3 + 2SiO2 + CO = 2FeSiO3 + CO2 (R2)
Fe3O4 + 3SiO2 + CO = 3FeSiO3 + CO2 (R3)
4FeSiO3 + O2 = 2Fe2O3 + 4SiO2 (R4) Namun , a = 24,37% dan a = 11,39 diperoleh setelah lima siklus dan sepuluh siklus, masing-masing. Wang et al. [38] bereksperimen reaktivitas operator oksigen Fe2O3 / Al2O3 disiapkan oleh pembakaran sol-gel dengan batubara pada rasio koefisien K = 1, dan hasilnya menunjukkan bahwa
FeAl2O4 dihasilkan dalam proses pembakaran demi memperkenalkan Al2O3. Di sini, karena lebih Fe2O3 dengan suhu
menurun lanjut bereaksi dengan Al2O3, dan Al2O3 secara signifikan menghambat Fe3O4 dan FeO regenerasi oksidatif yang cukup dengan udara, yang mengarah ke aktivitas decreaseof pembawa oksigen Fe2O3 / Al2O3. Menurut analisis ini, reaktivitas dan konversi tingkat Fe2O3 / Al2O3 OC dibuat dari debu bantalan metalurgi besi meningkat pengenalan Al2O3 untuk Fe2O3.
Tingkat konversi batubara menurun dengan nomor siklus meningkat, ini terutama disebabkan oleh pengenalan lembam operator Al2O3 melalui metode mekanis tradisional untuk bergaul dengan Fe2O3, yang dapat dicegah sepenuhnya untuk kontak dengan batubara dan respon untuk memainkan penghambatan batas tertentu untuk konversi batubara. Namun, berdasarkan hasil analisis sifat permukaan, antarmuka Fe2O3 / Al2O3 disiapkan oleh kopresipitasi menunjukkan lebih seragam, jumlah yang lebih besar dari lubang dan luas permukaan spesifik yang besar, yang mungkin atom-atom permukaan Fe2O3 / Al2O3 dengan menggantung atom reaktif tak jenuh ikatan menyebabkan reaksi kimia yang lebih tinggi [39]. Dengan siklus meningkat, bagaimanapun, lebih dan lebih abu batubara diakumulasikan dengan Fe2O3 / Al2O3 OC, yang dapat menyebabkan batu bara untuk bereaksi dengan Fe2O3 / Al2O3 OC untuk menghasilkan komponen silikat tertentu di CLC. Selain itu, efek aglomerasi antara abu batubara dan Fe2O3 / Al2O3 OC dapat mengurangi permukaan kontak reaktif batubara bubuk, sehingga mengarah ke kerusakan reaktivitas Fe2O3 / Al2O3 OC.
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