The feasibility study of tri-generation system in a sewage treatment plant

Pao Yue-kong Library Electronic Theses Database

The feasibility study of tri-generation system in a sewage treatment plant

 

Author: Zhou, Jun
Title: The feasibility study of tri-generation system in a sewage treatment plant
Degree: M.Eng.
Year: 2014
Subject: Sewage disposal plants
Sewage disposal plants -- Energy conservation.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: viii, 84, 10, 7 leaves : illustrations ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2760626
URI: http://theses.lib.polyu.edu.hk/handle/200/7648
Abstract: Although the tri-generation system has a better use of energy compared with single-use system. In order to improve the energy efficiency, we should find out the influencing factors and make improvement of the system. For tri-generation systems recent research mainly concentrated in two aspects, one is to study the performance of the single equipment of the system, the other hand is the study of the comprehensive performance of the whole system and optimization, such as the heat effective analysis and economic evaluation analysis of tri-generation system with different composition of installations. The purpose of the application of tri-generation in the sewage treatment plant is to use the limited generated biogas each day to produce electricity as much as possible and use the waste heat for the heating and cooling demand, which is different from tri-generation system used in buildings which have a stable load demand and needs a proper configuration of system designed to meet its load demand. In this dissertation, the aim is to compare the different energy performance between the regular operating of the system and putting some waste heat used for the ambient air cooling to improve the net power generation rate, this makes the process more complex to be analyzed. Absorption chillers can help to increase the performance of biogas-driven internal combustion plants. In this paper we analyze various integrated configurations of several types of absorption cooling chillers and ICE cogeneration systems driven by biogas. ICEs are fuelled with biogas and their waste heat is used to drive absorption chillers and other thermal energy users. The chillers considered in this study include single- and double-effect chillers. The exhaust gas from the ICE can be used directly to drive the chiller or indirectly to produce hot water to drive the chiller. In this paper we conduct a case study for an existing sewage treatment plant. Chilled water is used to cool the combustion air of the ICE. We identify the most suitable integrated configurations for tri-generation systems that use biogas and internal combustion engine. We analyze these configurations and compare them with conventional configurations using operational data from the existing sewage treatment plant. The best configurations are those systems with double-effect absorption chiller.

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