Performance Analysis On Distributed Energy System Using Biomass Micro Gas Turbine

Distributed Energy System (DES) using gasified biomass fuel is a new system that is fueled with internal combustion engine or gas turbine as the prime motor. It’s considered to be a promising potential system. Biomass energy directly or indirectly from the green plant photosynthesis, is a kind of renewable energy, which is also the only a renewable carbon source. Now fossil fuel increasingly exhausted, serious environmental pollution, global climate changes problem make biomass energy get more and more attention of the world. The western developed countries are studying the efficient use of biomass energy and the way of power generation technology for biogas. But in our country, the biomass energy utilization mode and biomass gasification and power generation technology is still in the preliminary stage, the biomass energy utilization technology has very big development space. This paper studied the distributed energy system of micro gas turbine which based on biogas.Firstly, this article analysis the performance of micro gas turbine based on biogas. The composition and calorific value of gas influence on the performance of gas turbine. Usually gas turbine can only use the designed fuel, but in fact the fuel composition often changes. There are many kinds of biogas. Due to climate and environment, gas composition and calorific value will changes greatly. When micro gas turbine uses other kinds of biogas fuel, the work conditions and performance will change. Because of the low calorific value of biomass gas, the efficiency of micro gas turbine and the margin surge of the compressor will reduce, even micro gas turbine cannot work. This article analysis the influence rule of biogas calorific value on gas turbine performance through simulation calculation and explore the feasibility of using off-design fuel micro gas turbine, then search for suitable methods to use different kinds of biogas as fuel. Secondly, puts forward the utilization projects for exhaust gas waste heat of60kW micro gas turbine.waste heat LiBr-H2O absorption chiller use water as refrigerant, lithium bromide solution as an absorbent, refrigerating machine run under the vacuum state, non-toxic, odorless, no explosion danger, safe, reliable, and is called the nuisanceless refrigeration equipment. The LiBr-H2O absorption chiller can use all kinds of low waste heat, be helpful for energy cascade utilization. This paper established the lithium bromide solution model and component model, then calculate the refrigerator each node parameter, equipment heat load and heat transfer area.Finally, analysis performance influence rule of the different parameters for distributed energy system of micro gas turbine which based on biogas. Calorific value of biogas is low and the combustible component is different. Influence factors of LiBr-H2O absorption chiller performance, include the cooling water and refrigerant water temperature, flow rate and water quality, the heat source temperature and solution flow factors. In the actual operation environment temperature have a major influence on gas distributed energy system. This paper analyzes the micro gas turbine electrical load change, lithium bromide refrigerator refrigerant water outlet temperature and cooling water inlet temperature changes, fuel type and environmental temperature changes to biogas distributed energy system performance influence.To sum up, this paper analyzes the performance of distributed energy system based on micro gas turbine which used biogas. It puts forward the solution for micro gas turbine using different biomass gas. This topic research has a positive effect on the promotion of new type of renewable energy utilization technology.