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Evaluation of Energy Efficiency in a Grain Unloading Platform

机译：谷物卸货平台的能效评估

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This paper aims to conduct an energy efficiency study in the tipping system of the unloading platform of a grain storage unit, based on the use of electrical devices to control the operation of the engine. For this purpose, two scenarios were established. The first scenario considers the platform in its current state, with engine start-up performed using a wye-delta switch. In the second scenario, wye-delta start is switched off, and a frequency inverter and a programmable logic controller (PLC) are coupled to control the electric motor. For both scenarios, the consumption of active and reactive energy in the discharge platform was measured, and the costs of the energy consumed were calculated over a period of one year. Finally, the discounted payback was calculated to evaluate the economic feasibility of installing the proposed equipment. The results obtained were as follows: For the current scenario, the energy consumed to tipping one metric ton of grain was 35.44.10-3 kWh; for the proposed scenario with the frequency inverter, the energy was 32.78.10-3 kWh. With an annual projection, the current scenario would consume the equivalent of 10 921.35 kWh, and the proposed scenario, 10 100.81 kWh, generating an annual savings, with the installation of the equipment, of R$721.49; the discounted payback found was approximately 31 years. It can thus be concluded that there is a reduction in electricity consumption from the use of the frequency inverter; however, the time of return of the invested capital is very long, making the proposal economically unfeasible.
机译：本文旨在通过使用电气设备控制发动机的运行，在谷物存储单元卸货平台的倾卸系统中进行能效研究。为此，建立了两种方案。第一种情况考虑平台处于当前状态，并使用星形-三角键开关执行发动机启动。在第二种情况下，星形-三角起动被关闭，并且变频器和可编程逻辑控制器（PLC）耦合以控制电动机。对于这两种情况，均测量了放电平台中的有功和无功能耗，并计算了一年的能耗成本。最后，计算了折现的投资回报率，以评估安装建议的设备的经济可行性。获得的结果如下：在当前情况下，倾倒一吨谷物所消耗的能量为35.44.10-3 kWh;对于使用变频器的建议方案，能量为32.78.10-3 kWh。根据年度预测，当前方案将消耗10 921.35 kWh，而拟议方案将消耗10 100.81 kWh，安装设备后每年可节省721.49雷亚尔;发现的折现回收期约为31年。因此可以得出结论，使用变频器可以减少电力消耗;然而，投资资本的回报时间很长，使得该建议在经济上不可行。

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