Microwave pyrolysis, powered by the solar photovoltaic (PV) electricity has been studied for safe and effective disposal of one of the abundantly available agro‐residues that is, corn stover (CS) in India. The study focuses on maximizing the yields of value‐added products that is, wood vinegar and biochar, because of their several applications in the agriculture and easy trading among the farmers with a scope of earning higher economic benefits. The effects of different levels microwave power, reaction time, and various concentrations of additive (biochar) on the yields of the pyrolytic products have been investigated. Under the optimal conditions of pyrolysis (input power of 700 W for microwave, pyrolysis reaction duration of 20 minutes and use of 5% additive from biochar), the yields of wood vinegar and biochar were measured to be 31 and 34 wt%, respectively, with the lower yields of both tars (9.64 wt%) and gas (25.2 wt%). The wood vinegar, obtained from the study, contained about 28%‐32% acids, 10%‐15% phenols, 18%‐20% ketones, and 12% alcohol with the pH in the range of 2.94‐3.21. The lower heating value (LHV) of biochar ranged from 22‐27 MJ/kg. From the techno‐economic and environmental assessment, the monthly income, payback period and quantity of CO₂ mitigation are estimated to be USD 44, 3.5 years and 25.6 tones in case of lab‐scale set up and USD 44114, 1.7 years, and 20 549 tones for scaled‐up production systems, respectively. These findings would contribute to diminish the greenhouse gases emissions, mitigate climate change, and help to derive economic benefits for the farmers along with the effective utilization of agro‐residues.

中文翻译：

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玉米秸秆的太阳能微波热解技术，用于增值产品和工艺技术经济评估

已经研究了由太阳能光伏（PV）供电的微波热解技术，以安全有效地处置印度玉米秸秆（CS）等大量可利用的农业残留物。该研究着重于使木醋和生物炭等增值产品的产量最大化，这是因为它们在农业中的多种应用以及农民之间的容易交易，具有一定的经济效益。研究了不同水平的微波功率，反应时间和各种浓度的添加剂（生物炭）对热解产物收率的影响。在最佳的热解条件下（微波输入功率为700 W，热解反应持续时间为20分钟，并使用5％的生物炭添加剂），测得的木醋和生物炭产率分别为31和34 wt％，分别具有较低的焦油（9.64 wt％）和气体（25.2 wt％）的产率。从研究中获得的木醋含有大约28％-32％的酸，10％-15％的苯酚，18％-20％的酮和12％的酒精，其pH值在2.94-3.21范围内。生物炭的较低热值（LHV）为22-27 MJ / kg。从技术经济和环境评估中，可以得出CO的月收入，投资回收期和数量在实验室规模的情况下，_2种缓解措施的估算费用分别为44美元，3.5年和25.6吨；对于规模化生产系统，_两种缓解措施的费用分别为44114美元，1.7年和20549吨。这些发现将有助于减少温室气体排放，减轻气候变化，并在有效利用农业残留物的同时，为农民带来经济利益。