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| saving in cooling water circulation system and its implement |
| TANG Yue, MA Zheng-Jun, DAI Sheng, ZHANG Xin-Peng, HUANG Zhi-Pan |
| (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract The cooling water circulation system is frequently subject to a low efficiency and a high energy consumption caused from improper pump selection, unreasonable regulation of working condition, unscientific management of operation and difficulty in energy consumption evaluation. In order to reduce the energy consumption, the water circulation system in a chemical plant was used as an investigation model, then the situation of equipment installation and pump operation conditions during normal production period were surveyed. Comparing the existing energy consumption with that under a variable frequency speed regulation, the space for energy saving was identified; eventually, the analysis of assessment of energy consumption of the whole system was completed. An energysaving water supply strategy, where a variable frequency speed regulation was utilized in the pump stations of the cooling water recirculation system, was established according to the pump affinity laws and by considering the energysaving in the pumps themselves and their systems. Under the premise of meeting the chemical production process requirements, a constant pressure water supply was realized in the water recirculation pipe network. Moreover, a survey method for evaluating the energy consumption in a cooling water recirculation system was suggested based on pump performance curve, motor torquespeed curve and operation parameters in the key operation conditions of the system. After the cooling water circulation system was refurbished in that chemical plant, the annual electric power consumption in the plant was reduced to 1.4×105 kW·h from 2.1×105 kW·h, the saved power is around 7×104 kW·h, causing the power consumption was reduced by up to 33%.
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Received: 15 February 2010
Published: 30 November 2012
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