Study on waste heat recovery from sludge drying exhaust gas based on High-Temperature heat pump coupled with steam compression

被引：0

作者：

Wang, Ruoting ^{[1
]}

Deng, Wenyi ^{[1
]}

Wang, Lihua ^{[2
]}

Hu, Mingtao ^{[1
]}

Chen, Guang ^{[2
]}

Su, Yaxin ^{[1
]}

机构：

[1] Donghua Univ, Coll Environm Sci & Engn, 2999 North Renmin Rd, Shanghai 201620, Peoples R China

[2] Shanghai SMI Wastewater Treatment Co Ltd, 1851 Longdong Rd, Shanghai 200086, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2025年 / 266卷

关键词：

Sludge drying; Exhaust gas; Heat pump; Steam compression; Aspen Plus; Waste heat recovery; DRYER;

D O I：

10.1016/j.applthermaleng.2025.125716

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

To address the high energy consumption and heat loss in sludge thermal drying, this study proposed a novel waste heat cascade utilization (WHCU) system for sludge drying exhaust gas based on high temperature heat pump steam compression technology. Process simulation of the high temperature heat pump was conducted through Aspen Plus to investigate the performance of five typical working fluids (R245fa, R245ca, R600, R1234ze(Z) and R1233zd(E)). R245fa was identified as the optimal working fluid, considering factors like performance, environmental impact, cost, and availability. Further process simulation and experimental investigation of WHCU system using R245fa were conducted based on a sludge thermal drying system with capacity of 1.06 t-DS/h. The results show that a system coefficient of performance (COP2) of 2.64 and an energy conversion efficiency of 66 % could be achieved at evaporator and condenser temperatures of 65 degrees C and 110 degrees C, respectively. A direct benefit of 72.60 CNY/t of wet sludge, an energy saving (expressed in standard coal equivalents) of 21.17 kg/h, and a CO2 reduction of 52.78 kg/h could be achieved under the optimal operating condition. The WHCU technology offers substantial benefits in energy conservation, emission reduction, and economic viability, with promising application prospects in sludge thermal drying.

引用

页数：11

共 32 条

[1] Mulopo J., A systematic overview of current advancements for chemical, material, and energy production using sewage sludge for industrial ecology and sustainability transition, Environ. Sustain., 7, pp. 5-29, (2024)
[2] Haghighat M., Majidian N., Hallajisani A., Samipourgiri M., Production of bio-oil from sewage sludge: A review on the thermal and catalytic conversion by pyrolysis, Sustain. Energy Technol. Assess., 42, (2020)
[3] Deng W.-Y., Yan J.-H., Li X.-D., Wang F., Zhu X.-W., Lu S.-Y., Cen K.-F., Emission characteristics of volatile compounds during sludges drying process, J. Hazard. Mater., 162, 1, pp. 186-192, (2009)
[4] (2023)
[5] Zhang C., Yang X., Tan X., Wan C., Liu X., Sewage sludge treatment technology under the requirement of carbon neutrality: Recent progress and perspectives, Bioresour. Technol., 362, (2022)
[6] Tanczuk M., Kostowski W., Karas M., Applying waste heat recovery system in a sewage sludge dryer – A technical and economic optimization, Energy Convers. Manag., 125, pp. 121-132, (2016)
[7] Qin Y., Fu H., Wang J., Liu M., Yan J., Waste heat and water recovery characteristics of heat exchangers for dryer exhaust, Dry. Technol., 36, 6, pp. 709-722, (2018)
[8] Ling W., Xing Y., Zhao C., Hong C., Feng W., Wang Y., Hu J., Hou J., Feng L., Research progress on exhaust gas emissions and control technology during sewage sludge thermal drying: A review, Dry. Technol., 42, 1, pp. 1-18, (2024)
[9] Deng W., Yu L., Chen Y., Chen G., Zhou P., Tian F., Su Y., Sludge preheating and viscosity reduction by waste heat from the exhaust gas of sludge paddle dryer, Dry. Technol., 40, 13, pp. 2617-2629, (2022)
[10] Yan H., Zhang C., Shao Z., Kraft M., Wang R., The underestimated role of the heat pump in achieving China's goal of carbon neutrality by 2060, Engineering, 23, pp. 13-18, (2023)

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