A conceptual design of an industrial production plant for activated carbon was developed to process 31.25 tons/day of industrial waste nutshells as the raw material and produce 6.6 ton/day of activated carbon using steam as an activation agent. The design considered the cost of the main equipment, the purchase price of the nutshells, basic services, and operation. A sensitivity analysis was developed, considering the price of the finished product and the volume of raw material processing varied up to ±25%. Furthermore, the total annual cost of the product was determined based on the production of 2100 tons/year of activated carbon. Two cash flows were developed and projected to periods of 10 years and 15 years of production, using a tax rate of 27%, a low discount rate (LDR) of 10% per year, and without external financing. For a 10-year production project, the net present value (NPV) was USD 2,785,624, the internal return rate (IRR) 21%, the return on investment (ROI) 25%, and the discounted payback period (DPP) after the fifth year. Considering a project with 15 years of production, the NPV was USD 4,519,482, the IRR at 23%, the ROI 24%, and the DPP after the fifth year of production.

中文翻译：

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废壳通过物理活化生产活性炭的设计，成本估算和敏感性分析

开发了活性炭工业生产装置的概念设计，以处理31.25吨/天的工业废坚果壳为原料，并使用蒸汽作为活化剂生产6.6吨/天的活性炭。设计考虑了主要设备的成本，简而言之的购买价格，基本服务和运营。考虑到最终产品的价格和原材料加工量的变化，进行了敏感性分析，误差高达±25％。此外，根据每年生产2100吨活性炭确定产品的年度总成本。开发了两种现金流，并计划将其生产期限分别定为10年和15年，采用27％的税率，每年10％的低折现率（LDR），并且无需外部融资。对于一个为期10年的生产项目，净现值（NPV）为2,785,624美元，内部收益率（IRR）为21％，投资回报率（ROI）为25％，第五次投资后的折现投资回收期（DPP）年。考虑到一个生产15年的项目，生产第5年后的净现值为4,519,482美元，IRR为23％，ROI为24％，DPP。