In 2023, 24 Energy Conservation Projects reduced • Operate one Slurry Pump Around “Operate one Slurry Pump around” is the project to reduce the electricity consumption of lower compartment of fractionation tower “53C101”, by operating one slurry pump instead of two. In fractional distillation, the temperature of the slurry oil at the bottom of the fractionating column is relatively high, at 330 ํC. It is required to reduce this temperature before reverting to fractionating tower “53C101” in order to maintain the level of heat in tower suitable for refining the distillates. When converting slurry oil to transfer heat before flowing into a fractionating tower, two slurry pumps are typically required which are 53P102B and 53P102C, with another slurry pump “53P101A” prepared as backup pump. The project enables the adjustment of slurry pump operation condition from two slurry pumps to only one slurry pump without any negative impact to fractional distillation. As a result, it helps save electricity cost by 3.5 million baht per year or decrease electricity consumption by 201 kWh, while also reducing GHG emissions by 366 tons of carbon dioxide equivalent (tCO2eq). • Power consumption diminution of the compressor in the Refrigeration system at HDPE plant The purpose of this project is to reduce the energy use of the gas compressor (Compressor) in the refrigeration unit by lowering the inlet pressure of the compressor from 1.3 BarG to 1.0 BarG. In HDPE Plant, there are 3 sets of refrigeration systems and typically 2 sets are in operation. The functionality of refrigeration system is to reduce the temperature of substances used in the production process in HDPE plant. The selected type refrigerant is R22. The main equipment of refrigeration system are compressor, evaporator, and condenser. And refrigeration compressor is the heart of the systems, acts as pump that moves the refrigerant through the system and requires power supply. Reducing the inlet pressure from 1.3 BarG to 1.0 BarG leads to the reduction of power consumption from 420 kWh to 390 kWh per 1 compressor with the unchanged performance of the cooling system. This project reduced energy cost by 1,435,200 baht per year while greenhouse gas emissions decreased by 54 tons of carbon dioxide equivalents (tCO2eq) Reduce energy cost 1,435,200 baht per year Reduce GHG gas emissions 54 tCO2eq Save energy consumption 201kWh Save energy cost 3.5 MB per year, Reduce GHG gas emissions 366 tCO2eq Greenhouse gas emissions by 106,309 tCO2eq Energy use by 965,101 gigajoules, 147 Business-Driven Sustainability 56-1 ONE REPORT 2023
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