論文 / 著書情報
Article / Book Information
題目(和文)

オイルスラッジ焼却灰と水蒸気を添加した熱分解によるオイルスラッジからの燃料油回収

Title(English)

Oil Recovery from Oil Sludge Employing Pyrolysis Process with OilSludge Ash and Steam Addition

著者(和文)

程爍Author(English)

Shuo Cheng

出典(和文)

学位:博士（工学）,学位授与機関:東京工業大学,
報告番号:甲第10337号,授与年月日:2016年9月20日,
学位の種別:課程博士,
審査員:吉川 邦夫,加茂 徹,竹下 健二,高橋 史武,時松 宏治,梶谷 史朗

Citation(English)

Degree:,Conferring organization: Tokyo Institute of Technology,
Report number:甲第10337号,
Conferred date:2016/9/20,
Degree Type:Course doctor,Examiner:,,,,,

学位種別(和文)博士論文Category(English)

Doctoral Thesis

種別(和文)

要約

Type(English)

OutlinePowered by T2R2 (Tokyo Institute Research Repository)

博士論文要約
The major objective of this thesis is to investigate the effect of the oil sludge ash addition andsteam injection on the yield and the quality of the oil product from the oil sludge pyrolysis. The
first chapter of this thesis introduced the background of this research including: the flow and theenvironmental impact of oil sludge, the classification and the characteristic of oil sludge, and thereview of the previous researches to give a more comprehensive understanding about theobjective and meaningfulness of this research.
To explore the pyrolysis behavior of oil sludge, and to investigate the effectiveness and usageof the oil sludge ash, the pyrolysis experiments were conducted in the TGA and the two-stage
fixed bed reactor in Chapter 2. The results indicated that:
1. For oil production, the one-stage pyrolysis pattern is more effective than the two-stage pattern,which means that feedstock should contact with additives directly during the pyrolysis process.
2. Oil sludge ash can be used as an additive in the oil sludge pyrolysis because: (a) Addition of oilsludge ash increased the oil yield significantly; (b) The quality of the oil products were improvedby the presence of oilfield sludge ash.
In chapter 3, the comparison experiments of the oil sludge ash and the quartz sand in thestirred tank reactor were described to investigate the similarity and the difference between theeffects of the oil sludge ash and the quartz sand during the oil sludge pyrolysis, further tounderstand if the oil sludge ash can provide the chemical effect. According to the results:
1. Addition of the oil sludge ash can increase the oil yield and reduce the optimal reaction
temperature from 500 to 450°C, and
2. The oil sludge ash can inhibit the condensation reaction during the pyrolysis to a greater extent
than the quartz sand3. The presence of the oil sludge ash can reduce the carbon residue and increase the lightoil/heavy oil ratio to a greater extent than the quartz sand
These results are due to not only the physical effect but also the chemical effect of the oilsludge ash during the oil sludge pyrolysis process. Therefore, in Chapter 4, the oil sludge pyrolysis
experiments with the oil sludge ash and the main compositions of the oil sludge ash such as
Al2O3, Fe2O3, CaO and the quartz sand were carried out to investigate the chemical effect andthe possible catalytic reaction mechanism of the oil sludge ash. The results showed that:
1. Addition of the oil sludge ash, Al2O3, Fe2O3 and CaO to the oil sludge pyrolysis process
reduces the carbon residue of the oil product and suppresses the migration of S, N and O fromthe oil sludge to the oil product, and increases the oil product saturation degree moderately.

2. These improvements of the oil product quality are attributable to the catalytic effect of theAl2O3, Fe2O3 and CaO compositions in the oil sludge ash.
Through the discussion in Chapter 4, we found that H2O might play an important role in thepyrolysis reaction between oil sludge and the oil sludge ash. In Chapter 5, we tried to use thesteam injection technology during the oil sludge pyrolysis: (1) to investigate the effect of steam
and the oil sludge ash on the product distribution and the oil product quality; (2) to explore theinteraction relationship between steam and the oil sludge ash and the possible catalytic
mechanism during the pyrolysis process. The results indicated that:
1. Both of steam injection and the oil sludge ash addition cause the increase of the oil yield.
2. Steam injection can inhibit the secondary cracking reaction, and then prevent the oil products
from being further cracked to gas.
3. The oil sludge ash addition decreases the carbon residue and the Light oil/Heavy oil ratio byconverting more heavy fractions or coke precursors to lighter fractions. The synergetic effect ofsteam injection and the oil sludge ash addition can further decrease the carbon residue of the oilproduct.
4. The presence of the oil sludge ash has a capability of decreasing the S, N and O mobilities ofthe oil product significantly. The synergetic effect of steam injection and the oil sludge ash
addition can further improve this capability.
5. The obvious decrease of the carbon residue, and the increase of the isoparaffin index in thesteam and oil sludge ash coexisting case might be attributed to the improved catalytic effect of
the oil sludge ash by steam injection.