Abstract
A novel design has been developed to improve the waste-to-energy process through the integration with a biomass-fired power plant. In the proposed scheme, the superheated steam generated by the waste-to-energy boiler is fed into the low-pressure turbine of the biomass power section for power production. Besides, the feedwater from the biomass power section is utilized to warm the combustion air of the waste-to-energy boiler, and the feedwater of the waste-to-energy boiler is offered by the biomass power section. Based on a 35-MW biomass-fired power plant and a 500-t/d waste-to-energy plant, the integrated design was thermodynamically and economically assessed. The results indicate that the net power generated from waste can be enhanced by 0.66 MW due to the proposed solution, and the waste-to-electricity efficiency increases from 20.49% to 22.12%. Moreover, the net present value of the waste-to-energy section is raised by 5.02 million USD, and the dynamic payback period is cut down by 2.81 years. Energy and exergy analyses were conducted to reveal the inherent mechanism of performance enhancement. Besides, a sensitivity investigation was undertaken to examine the performance of the new design under various conditions. The insights gained from this study may be of assistance to the advancement of waste-to-energy technology.
Highlights
Under the stress of energy shortage, global warming, and environmental pollution, the utilization of renewable energy sources has drawn much attention worldwide [1,2]
This paper proposed an innovative WtE design, which is combined with a biomass-fired power plant based on the steam cycle
The primary air is further heated to 220.0 ◦ C in the PAH3 by the saturated steam of the WtE boiler, and the condensate out of the PAH3 is delivered to the DEA inlet after decreasing its pressure by the pressure reducing valve (PRV)
Summary
Under the stress of energy shortage, global warming, and environmental pollution, the utilization of renewable energy sources has drawn much attention worldwide [1,2]. Waste-to-energy (WtE) incineration is a popular method for waste management, due to its features of dramatical MSW volume reduction and affordable costs for heat/electricity generation, especially for developing countries [12]. Bogalea et al [18] described a design that divides the flue gas into two fractions, and the lower corrosive part is delivered to a separate superheater to enhance the steam parameters Another approach to promote the steam temperature is employing a radiant superheater in the WtE boiler [19]. Little work has been published on integrating a WtE plant with a biomass-fired power plant based on the steam cycle incorporation, which may contribute to improving the waste-to-electricity efficiency. This paper proposed an innovative WtE design, which is combined with a biomass-fired power plant based on the steam cycle. The influence of the boiler loads on the performance of the new design was examined
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