Screening Experiments and Static Scale Inhibition Performance Evaluation of Scale Inhibitors for Synchronous Condenser Circulating Cooling Water

doi:10.12096/j.2096-4528.pgt.23121

Abstract

Abstract:

Objectives During the operation of the circulating cooling water of the regulating camera, the concentration effect leads to the scaling of the heat exchanger and the cooling water packing, which affects the safe and stable operation of the regulating camera. Methods In order to solve the scaling problem of circulating cooling water, it is necessary to add various scale inhibitors to alleviate the scaling trend. In order to explore the scale inhibition effect of different formulations of scale inhibitors under different working conditions, the scale inhibition performance of PBTCA, HEDP, LQ-8531, TQ low phosphine scale inhibitors and TQ scale inhibitors was evaluated by limiting carbonate deposition method and limiting carbonate concentration ratio method. The effects of temperature, hardness and dosage on the scale inhibition performance of five kinds of scale inhibitors were studied by using self-made scale inhibition test bench. Results The comprehensive evaluation shows that LQ-8531 has the best scale inhibition performance among the five scale inhibitors, and it can maintain high scale inhibition efficiency in high hardness and high temperature environment. Conclusions The research results provide a valuable reference for the selection of scale inhibitor for circulating cooling water of heat exchange equipment in high temperature and high salt area.

Key words: synchronous condenser, converter station, circulating water scale inhibition, static screening experiments, static scale inhibition simulation, performance evaluation

CLC Number:

TK 01

Guobin LI, Liang ZHANG, Qiang XIE, Zishu HU, Zhonglin XIA, Ju ZHAO, Yuling ZHANG, Shuangchen MA. Screening Experiments and Static Scale Inhibition Performance Evaluation of Scale Inhibitors for Synchronous Condenser Circulating Cooling Water[J]. Power Generation Technology, 2025, 46(2): 353-360.

Figures/Tables 12

Fig. 1 Experimental setup for scale inhibitor screening

Tab. 1 Reagents for scale inhibition performance testing

实验试剂	纯度	生产厂家
氢氧化钾	分析纯	天津科密欧化学试剂有限公司
盐酸	分析纯	天津科密欧化学试剂有限公司
十水合四硼酸钠	分析纯	天津科密欧化学试剂有限公司
钙—羧酸指示剂	分析纯	天津科密欧化学试剂有限公司
碳酸氢钠	分析纯	天津科密欧化学试剂有限公司
氯化钙	分析纯	天津科密欧化学试剂有限公司
EDTA标准滴定液	0.01 mol/L	天津科密欧化学试剂有限公司
PBTCA	质量分数50%	麦克林公司
HEDP	质量分数60%	麦克林公司
LQ-8531	—	中天兰清化工
TQ低磷阻垢剂	—	天庆化工
TQ无磷阻垢剂	—	天庆化工

Tab. 2 Physical and chemical properties of composite scale inhibitors

参数	LQ-8531	TQ低磷	TQ无磷
外观	棕色透明液体	黄色透明液体	黄色透明液体
唑类(C₆H₄NHN:N计)质量分数/%	0.29	0.27	0.53
磷酸盐(PO $4 3 -$ 计) 质量分数/%	12.88	5.97	1.06
亚磷酸盐(PO $3 3 -$ 计) 质量分数/%	0.03	0.155	0.10
正磷酸盐(PO $4 3 -$ 计) 质量分数/%	0.02	0.18	0.18
固体质量分数/%	39.59	34.77	36.36
密度(20 ℃)/(g/cm³)	1.200	1.174	1.171
pH值(1%水溶液)	2.37	2.24	2.09

Tab. 2 Physical and chemical properties of composite scale inhibitors

参数	LQ-8531	TQ低磷	TQ无磷
外观	棕色透明液体	黄色透明液体	黄色透明液体
唑类(C₆H₄NHN:N计)质量分数/%	0.29	0.27	0.53
磷酸盐(PO $4 3 -$ 计) 质量分数/%	12.88	5.97	1.06
亚磷酸盐(PO $3 3 -$ 计) 质量分数/%	0.03	0.155	0.10
正磷酸盐(PO $4 3 -$ 计) 质量分数/%	0.02	0.18	0.18
固体质量分数/%	39.59	34.77	36.36
密度(20 ℃)/(g/cm³)	1.200	1.174	1.171
pH值(1%水溶液)	2.37	2.24	2.09

Fig. 2 Graphs of performance testing results of different scale inhibitors

Fig. 3 Effect of temperature on scale inhibition efficiency

Fig. 4 Effect of water hardness on scale inhibition performance

Fig. 5 Effect of scale inhibitor dosage on scale inhibition performance

Fig. 6 Effect of PBTCA in static simulation experiment

Fig. 7 Effect of LQ-8531 in static simulation experiment

Tab. 3 Elemental analysis of external cooling circulating water quality

测试元素	样品元素质量浓度/(mg/L)
Al	<0.02
Ca	98.74
Fe	<0.02
K	59.86
Mg	7.63
Na	236.08
P	2.24
S	9.08
Si	12.50

Fig. 8 XRD analysis of scale samples

Tab. 4 Market prices of different scale inhibitors

阻垢剂名称	价格/(元/kg)
PBTCA	9.7g
HEDP	10
LQ-8531	6
TQ低膦阻垢剂	13
TQ无磷阻垢剂	15

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