油田含聚污水在换热表面的结垢特性研究

doi:10.3976/j.issn.1002-4026.20240061

Abstract

Abstract:

Fouling is a common problem in the efficient conversion and utilization of energy as it significantly reduces heat transfer efficiency and jeopardizes the operational safety of equipment. In recent years, with the application of polymer oil drive technology in recent years, the fouling problem caused by HPAM in the recovered fluid has gradually attracted attention. Scaling processes are more complex and fouling is more stubborn in HPAM-containing environments than in HPAM-free environments. Herein, to address the fouling of polymer-bearing wastewater on the surface of heat-exchanger equipment, we experimentally investigated the impacts of factors such as heat-exchanger surface temperature, HPAM mass concentration, hydrolysis degree, fluid salinity, and surface roughness on the fouling rate and identified the fouling patterns of polymer-bearing wastewater on such surfaces. It was found that polymer concentration is the most important factor affecting the fouling rate of polymer-bearing wastewater. The fouling rate decreases and then increases with increasing HPAM mass concentration, and HPAM exerts an antagonistic effect on the fouling rate. The fouling rate increases with increasing heat-exchanger surface temperature, and boiling accelerates the surface fouling rate. In addition, there is a critical degree of HPAM hydrolysis at which the fouling rate is the highest, while the surface roughness has no significant effect on scaling rate.

Key words: polyacrylamide, polymer-bearing wastewater, heat-exchanger surface, fouling rate

CLC Number:

TE345

LI Fengming, GAO Yajie, WEI Zhengnan, YANG Yong, JIAO Bin, MA Yong. Research on fouling characteristics of oil-field polymer-bearing wastewater on the surface of heat-exchanger equipment[J].Shandong Science, 2025, 38(4): 106-117.

Figures/Tables 22

Table 1

Composition analysis of the working fluid"

检测项目	检测结果	检测项目	检测结果
ρ(Na⁺)/(mg·L^-1)	5 318	温度/℃	45
ρ(K⁺)/(mg·L^-1)	150.9	pH	7
ρ(Ca²⁺)/(mg·L^-1)	681.7	ρ(溶解氧)/(mg·L^-1)	0
ρ(Mg²⁺)/(mg·L^-1)	155.7	ρ(游离二氧化碳)/(mg·L^-1)	45
ρ(Sr²⁺)/(mg·L^-1)	0	ρ(硫化物)/(mg·L^-1)	0.76
ρ(Ba²⁺)/(mg·L^-1)	0	ρ(含油量)/(mg·L^-1)	115.3
ρ(Fe²⁺)/(mg·L^-1)	2.6	ρ(悬浮物)/(mg·L^-1)	18.2
ρ(Cl^-)/(mg·L^-1)	8 808.4	粒径中值/μm	4.1
ρ( $SO 4 2 -$ )/(mg·L^-1)	34	平均腐蚀速率/(mm·a^-1)	0.037
ρ(F^-)/(mg·L^-1)	0	原菌/(个·mL^-1)	25
ρ( $NO 3 -$ )/(mg·L^-1)	0	铁细菌/(个·mL^-1)	0
ρ( $CO 3 2 -$ )/(mg·L^-1)	0	腐生菌/(个·mL^-1)	2.5
ρ( $HCO 3 -$ )/(mg·L^-1)	629.7	矿化度/(个·mL^-1)	15 773

Table 1

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Table 2

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Table 3

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Table 6

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试剂名称	质量浓度/(mg·L^-1)
NaHCO₃	868.80
NaCl	12 905.91
CaCl₂	1 888.94

实验方案编号	砂纸粒度/目	表面粗糙度R_a/μm
1	60	0.515
2	120	0.375
3	220	0.283
4	400	0.156
5	600	0.106

实验方案编号	NaHCO₃质量浓度/ (mg·L^-1)	CaCl₂质量浓度/ (mg·L^-1)	NaCl质量浓度/ (mg·L^-1)	矿化度/ (mg·L^-1)
1	868.8	1 888.9	0	2 757.7
2	868.8	1 888.9	4 302.0	7 059.7
3	868.8	1 888.9	8 604.0	11 361.7
4	868.8	1 888.9	12 905.9	15 663.6

实验方案编号	HPAM水解度/%	HPAM质量浓度/(mg·L^-1)
1	0	800
2	20	800
3	30	800
4	40	800
5	100	800

实验方案编号	换热管材料	材料热导率/(W·m^-1·K^-1)	HPAM质量浓度/(mg·L^-1)
1	304不锈钢	16.3	0
2	304不锈钢	16.3	800
3	TA1钛合金	7.95	0
4	TA1钛合金	7.95	800
5	紫铜	398	0
6	紫铜	398	800
7	铝合金	201	0
8	铝合金	201	800

Research on fouling characteristics of oil-field polymer-bearing wastewater on the surface of heat-exchanger equipment

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References 18

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