Abstract
Current vehicle bio-methane plants have drawbacks associated with high energy consumption and low recovery levels of waste heat produced during the gasification process. In this paper, we have optimized the performance of heat exchange networks using pinch analysis and through the introduction of heat pump integration technology. Optimal results for the heat exchange network of a bio-gas system producing 10,000 cubic meters have been calculated using a pinch point temperature of 50 °C, a minimum heating utility load of 234.02 kW and a minimum cooling utility load of 201.25 kW. These optimal parameters are predicted to result in energy savings of 116.08 kW (19.75%), whilst the introduction of new heat pump integration technology would afford further energy savings of 95.55 kW (16.25%). The combined energy saving value of 211.63 kW corresponds to a total energy saving of 36%, with economic analysis revealing that these reforms would give annual savings of 103,300 USD. The installation costs required to introduce these process modifications are predicted to require an initial investment of 423,200 USD, which would take 4.1 years to reach payout time based on predicted annual energy savings.
Highlights
With the fast development of the biogas industry, using biogas to achieve greater economic benefits is one of key factors affecting the development model shift of large scale biogas plants from environment protection mode to energy generation mode
This research shows that it is possible to effectively recycle the systemic waste heat using the technologies of pinch analysis and heat pump integration
It was predicted that the introduction of heat pump integration technology would allow a further 95.55 kW of waste heat to be recovered from biogas slurry and compressor cooling water, corresponding to a further energy saving rate of 16.25%
Summary
With the fast development of the biogas industry, using biogas to achieve greater economic benefits is one of key factors affecting the development model shift of large scale biogas plants from environment protection mode to energy generation mode. Studies thatmethods recovery heat can effectivelyand reduce production stages, resulting in 64–100% of the total input energy being recovered, which enabled net energy consumption, increase biogas production levels, and produce significant cost savings. Biogas production to be increased by 5.3–17.4% [10] These studies reveal that recovery of waste heat most of these studies have focused primarily on recovering heat from a single source, with recovery can effectively reduce energy consumption, increase biogas production levels, and produce methods concentrating on simple heat exchange processes [11]. We anticipate thathow the results described willmight encourage efficient use ofof waste analysis to determine new heat pump technology be usedmore for global recovery energyengineering in a vehicle plants, bio-methane plant [12,13]. Economic efficiency to be improved and their environmental impact reduced
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