FCC油浆中固体颗粒沉降特性与沉降速度模型

肖之敏; 熊鹰; 周晓龙

doi:10.14135/j.cnki.1006-3080.20220208001

FCC油浆中固体颗粒沉降特性与沉降速度模型

doi: 10.14135/j.cnki.1006-3080.20220208001

华东理工大学化工学院, 上海 200237

详细信息

作者简介:
肖之敏（1995 -），女，江苏镇江人，硕士生，研究方向为油气储运工程。E-mail：double8021@163.com

通讯作者:
周晓龙，E-mail：xiaolong@ecust.edu.cn

中图分类号: TE62
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- 被引次数: 0
出版历程
- 收稿日期: 2022-02-08
- 网络出版日期: 2022-06-10

Settlement Characteristics and Settlement Velocity Model of Solid Particles in FCC Slurry

School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 脱除催化裂化（FCC）油浆中的固体颗粒可以显著提高油浆的价值，沉降脱固是有效的手段之一。影响油浆中固体颗粒沉降的主要因素包括油浆体系的黏度、油浆与固体颗粒密度差和固体的颗粒度，采用添加石油醚溶剂油和改变体系温度的方法调节油浆液固体系的黏度和密度差，用重复深度吸管法计算颗粒沉降速度，得到了沉降过程中油浆物性变化和不同粒径固体颗粒沉降的规律，关联得到了油浆中固体颗粒沉降速度经验公式，建立了油浆中固体颗粒的沉降模型，模型计算结果与实验结果的误差在10%以内。研究结果可为优化油浆沉降脱固工艺提供支持。
- FCC油浆 /
- 固体颗粒 /
- 脱固 /
- 粒径分布 /
- 沉降速度
Abstract: FCC slurry oil, rich in polycyclic aromatic hydrocarbons, is an ideal raw material of high value-added petroleum products such as carbon fiber, needle coke and carbon black. However, their uses are limited by the interior solid particles. The removal of particles in slurry oil is essential to improve its applicability. The viscosity of the slurry, density difference between the slurry and particle, and particle size are the key factors to influence the sedimentation of solid particles in slurry oil. Here, the effect of the addition of petroleum ether and sedimentation temperature were tested to optimize the viscosity of the slurry and density difference. The McLaughlin method was applied to calculate the settlement velocity in the slurry oil in the settlement experiments. The characteristics change of slurry oil and the sedimentation laws of particles of different sizes were analyzed to obtain a settlement velocity model. The results showed that the error between experiment and model method was within 10%. It was also suggested that the sedimentation temperature and the loading amount of petroleum ether significantly affected the viscosity of the slurry oil as well as the settlement behavior. As the viscosity decreased, the particle settling speed increased. In addition, the sedimentation laws of particles of different sizes were dramatically different. The sedimentation rate of the particles with a diameter larger than 40 μm was significantly influenced by the process conditions, while that for smaller particles with a diameter below 20 μm was relatively less influenced. This study offers insight into improving the separation efficiency of solid particles during FCC slurry settlement process.
- FCC slurry /
- solid particles /
- removal of solid particle /
- particle size distribution /
- settlement velocity

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图 1 不同石油醚质量分数下不同取样处颗粒质量浓度随沉降时间的变化

Figure 1. Change of particle mass concentration with settlement time for different sampling height and different petroleum ether mass fractions

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图 2 不同石油醚质量分数下油浆底层颗粒质量浓度随沉降时间的变化

Figure 2. Change of down particle mass concentration with settlement time for different petroleum ether mass fractions

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图 3 不同石油醚质量分数不同取样处颗粒沉降速度随沉降时间的变化

Figure 3. Change of settlement velocity with settlement time for different sampling height and different petroleum ether mass fractions

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图 4 固体颗粒C_D~Re_p曲线

Figure 4. C_D~Re_p curve of solid particles

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图 5 沉降速度与粒径的关系曲线

Figure 5. Relationship between settling velocity and particle size

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表 1 FCC油浆基本性质

Table 1. Properties of FCC slurry

ρ(20 ℃)/(g·cm⁻³)	μ(150 ℃)/(mPa·s)	w(Ash)/%	w/%
ρ(20 ℃)/(g·cm⁻³)	μ(150 ℃)/(mPa·s)	w(Ash)/%	C	H	N	S	Saturate	Aromatic	Resin and asphaltene
1.0564	76.8	0.3793	90.83	8.18	0.18	0.35	15.8	69.3	14.9

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表 2 阻力系数计算所需参数

Table 2. Parameters required for drag coefficient calculation

Time/min	Layer	w(Petroleum ether)=10%			w(Petroleum ether)=20%			w(Petroleum ether)=30%
Time/min	Layer	ρ/(g·cm⁻³)	μ/(Pa·s)	d_p/μm	ρ/(g·cm⁻³)	μ/(Pa·s)	d_p/μm	ρ/(g·cm⁻³)	μ/(Pa·s)	d_p/μm
30	Upper	0.9451	0.0289	27.4	0.9384	0.0181	25.7	0.9203	0.0104	22.3
	Middle	0.9457	0.0283	28.2	0.9391	0.0186	26.9	0.9212	0.0107	24.9
	Lower-middle	0.9469	0.0297	28.7	0.9403	0.0188	27.6	0.9215	0.0108	25.4
	Down	0.9489	0.0309	30.5	0.9409	0.0207	33.6	0.9351	0.0161	35.3
60	Upper	0.9388	0.0278	25.4	0.9374	0.0172	22.8	0.9157	0.0101	19.6
	Middle	0.9411	0.0264	25.7	0.9379	0.0183	24.9	0.9193	0.0104	21.8
	Lower-middle	0.9444	0.0263	28.1	0.9387	0.0185	26.5	0.9216	0.0105	24.9
	Down	0.9493	0.0313	31.7	0.9417	0.0218	36.2	0.9383	0.0165	37.4
90	Upper	0.9326	0.0225	20.5	0.9209	0.0164	17.7	0.9022	0.0098	14.6
	Middle	0.9334	0.0241	22.8	0.9234	0.0166	19.7	0.9044	0.0100	18.2
	Lower-middle	0.9378	0.0221	27.2	0.9328	0.0173	25.2	0.9113	0.0106	23.6
	Down	0.9516	0.0322	34.0	0.9426	0.0232	37.2	0.9389	0.0179	38.1
120	Upper	0.9281	0.0217	13.6	0.9111	0.0133	11.3	0.8916	0.0076	7.7
	Middle	0.9277	0.021	17.2	0.9137	0.0137	15.2	0.8942	0.0092	14.3
	Lower-middle	0.9321	0.0225	23.5	0.9231	0.0155	21.2	0.9048	0.0098	19.1
	Down	0.9607	0.0334	37.4	0.9487	0.0251	40.1	0.9408	0.0191	41.0
150	Upper	0.9244	0.0213	12.1	0.9102	0.126	9.7	0.8918	0.0073	6.8
	Middle	0.9279	0.0227	16.0	0.9174	0.138	12.7	0.8937	0.0084	12.7
	Lower-middle	0.9323	0.0228	22.7	0.9203	0.143	20.7	0.9033	0.0094	17.4
	Down	0.9633	0.0338	37.2	0.9494	0.272	41.3	0.9413	0.0198	41.2

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表 3 油浆中固体颗粒沉降速度实验值与计算值对比

Table 3. Comparison of calculated and experimental settlement velocity of solid particles in slurry

Time/min	Layer	Settlement velocity/(mm·s⁻¹)
		w(Petroleum ether)=10%		w(Petroleum ether)=20%		w(Petroleum ether)=30%
		Experimental value	Calculated value	Experimental value	Calculated value	Experimental value	Calculated value
30	Upper	0.00133	0.00119	0.00184	0.00171	0.00262	0.00248
	Middle	0.00141	0.00129	0.00195	0.00181	0.00301	0.00297
	Lower-middle	0.00143	0.00125	0.00204	0.00187	0.00331	0.00306
	Down	0.00143	0.00133	0.00255	0.00249	0.00395	0.00363
60	Upper	0.00123	0.00110	0.00156	0.00143	0.00220	0.00204
	Middle	0.00130	0.00117	0.00172	0.00160	0.00261	0.00239
	Lower-middle	0.00148	0.00136	0.00195	0.00177	0.00305	0.00302
	Down	0.00151	0.00141	0.00280	0.00272	0.00412	0.00388
90	Upper	0.00104	0.00095	0.00110	0.00102	0.00137	0.00128
	Middle	0.00118	0.00106	0.00135	0.00122	0.00183	0.00190
	Lower-middle	0.00152	0.00158	0.00172	0.00178	0.00263	0.00286
	Down	0.00166	0.00154	0.00252	0.00269	0.00341	0.00371
120	Upper	0.00050	0.00045	0.00060	0.00055	0.00055	0.00051
	Middle	0.00082	0.00073	0.00107	0.00094	0.00154	0.00137
	Lower-middle	0.00134	0.00122	0.00157	0.00151	0.00225	0.00212
	Down	0.00159	0.00159	0.00230	0.00276	0.00327	0.00357
150	Upper	0.00049	0.00037	0.00050	0.00043	0.00046	0.00042
	Middle	0.00064	0.00059	0.00070	0.00064	0.00124	0.00118
	Lower-middle	0.00122	0.00112	0.00155	0.00158	0.00175	0.00186
	Down	0.00141	0.00160	0.00190	0.00267	0.00257	0.00285

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表 4 质量分数为20%的石油醚加入后不同沉降时间、不同取样层颗粒粒径分布

Table 4. Particle distribution in different settling time and sampling height with w=20% petroleum ether

Time/min	Layer	Particle distribution/%
Time/min	Layer	<20 μm	20~40 μm	40~60 μm	>60 μm
30	Upper	44.2	33.3	14.3	4.2
	Middle	41.7	37.0	14.8	6.5
	Lower-middle	39.6	27.0	18.2	15.3
	Down	37.4	21.7	25.2	15.7
60	Upper	49.5	36.2	10.8	3.4
	Middle	43.1	38.7	12.9	5.3
	Lower-middle	43.2	24.1	17.8	14.9
	Down	32.0	24.6	26.5	16.9
90	Upper	74.8	16.9	8.1	0.2
	Middle	66.7	25.8	2.6	4.9
	Lower-middle	43.4	24.8	17.3	14.5
	Down	29.5	25.0	27.7	17.5
120	Upper	81.4	16.5	2.1	0
	Middle	69.9	24.5	2.2	3.4
	Lower-middle	52.9	23.1	14.3	9.7
	Down	26.3	26.3	28.7	18.7
150	Upper	91.7	8.3	0	0
	Middle	71.1	25.8	0.8	2.3
	Lower-middle	54.7	22.5	12.9	9.9
	Down	27.4	25.7	29.0	17.9

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