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The Research of Distributed Energy Resources System

Author: JiangRunHua
Tutor: CaiZuoXian；CuiPing
School: Graduate School,Chinese Academy of Sciences
Course: Engineering Thermophysics
Keywords: Distributed Energy Systems CCHP system Variable Conditions Internal combustion engine Solar Gas turbine Environmental parameters
CLC: TM611.3
Type: Master's thesis
Year: 2009
Downloads: 977
Quote: 5
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Abstract

Energy is the basis of human to subsistence activities. With the social and economic development, the demand for energy is growing. This stage, China's energy consumption is mainly coal-based energy structure is unreasonable, energy efficiency is not high, it is one of the world's highest energy consumption per unit of carbon dioxide emission intensity is relatively high; should rapidly move towards sustainable model of development in harmony with nature, such as the development of many types of energy systems integration, and the use of renewable energy. In this thesis, relying Natural Science Foundation of \. Proposed solar energy and gas turbine CCHP system integration, and analysis of piston internal combustion engine (hereinafter referred to as the internal combustion engine) the CCHP system performance typical variable conditions, to discuss environmental parameters CCHP system. Solar energy is the most compelling clean energy renewable energy. It has a low density, discontinuous, unstable by environmental factors affect large energy flow, you need to be complementary with other energy sources. Distributed energy system, on the one hand, the type of small-scale systems, suitable for combination with solar; the other hand, make up the solar discontinuous, unstable shortcomings. For these reasons, solar and gas turbine CCHP system integration, based on relative energy-saving rate, the proposed new system is more suitable for the evaluation of the energy saving rate throughout the year relative. Optimized solar collector area, compared with the conventional gas turbine CCHP system; discuss gas turbine installed capacity, intensity of solar radiation and sunshine duration best solar collector area. The internal combustion engine cooling heating and power cogeneration system variable conditions in its infancy, from the internal combustion engine CCHP system three major equipment that the internal combustion engine, the variable conditions of the waste heat boiler and chiller plants start. A single pressure HRSG (divided into the production of saturated steam waste heat boiler producing superheated steam HRSG) parsing features variable conditions, and correction DOE-2 model refrigeration unit variable conditions, combined with constant speed internal combustion engine VARIABLE CONDITIONS characteristics obtained cogeneration system performance. Consider changing load of the internal combustion engine, the cooling water inlet temperature of the refrigeration unit and chilled water outlet temperature of the system. Total capacity utilization Z equivalent (exergy) the efficiency η _ex, the economy (exergy) efficiency θ, and the relative energy-saving rate FESR in specific power (?) Is about 0.8, there is a maximum for the system best state point. When the (?) Is 0.2 to 0.3, FESR is negative, which means that compared with the sub-production system, the cogeneration system is not energy efficient. Environmental parameters of the the CCHP system variable conditions affect also great Turbine CCHP systems only qualitative analysis, focusing on the analysis of atmospheric pressure on the internal combustion engine CCHP system. With the reduction of the atmospheric pressure, η _ex, the θ and FESR first increase decrease in the atmospheric pressure of about 0.8 bar maximum, and Z is reduced as the atmospheric pressure decrease.

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