environment impact evaluation of a new type continuous mixing
environment impact evaluation of a new type continuous mixing
environment impact evaluation of a new type continuous mixing
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CementMixing plant(Dram <strong>type</strong> mixer)Sand and gravelCement feederBelt feeder 1Belt conveyerWaterFig.6 Outline <strong>of</strong> batch <strong>mixing</strong> plant for CSG.Sand and gravelCementCement feederMY-mixerBelt feeder 1Belt conveyer 1WaterBeltfeeder 2Belt conveyer 2Fig.7 Outline <strong>of</strong> <strong>continuous</strong> <strong>mixing</strong> plant for CSG.Table 3 Capacity and equipments <strong>of</strong> plant.Batch <strong>mixing</strong> plant Continues <strong>mixing</strong> plantMaximum production capacity 60 m 3 /h 150 m 3 /hEquipment for material suppliment belt conveyer 350t/h belt conveyer-1 350t/hcement feeder 12t/h belt conveyer-2 350t/hMixerNotesbelt feeder 350t/hwater pomp 0.5m 3 /mindust extractor 20m 3 /mindram <strong>type</strong> mixer 3.0m 3<strong>mixing</strong> cycle time 180sbelt feeder-1 350t/hbelt feeder-2 350t/hcement feeder 12t/hwater pomp 0.5m 3 /mindust extractor 20m 3 /minMY-static mixer 650*650 L=5.2mTable 4 shows estimated results <strong>of</strong> powerconsumption and CO 2 emission <strong>of</strong> each plant forCSG. At the estimation <strong>of</strong> the electric consumption<strong>of</strong> batch <strong>mixing</strong> plant, because its materialsupplement is not <strong>continuous</strong>, the duration <strong>of</strong>operating equipments for material supplement areconsidered as 24 minutes per hour (i.e. 0.4 times <strong>of</strong>all duration). For example, total primal electricconsumption <strong>of</strong> belt conveyer is 30kW, and then itmultiplied by 0.4, thus it is equal to 12kW. As shownin table 4, the total powers <strong>of</strong> two <strong>type</strong>s <strong>of</strong> plants arealmost same. However their maximum productioncapacity <strong>of</strong> <strong>continuous</strong> <strong>mixing</strong> plant is higher thanthat <strong>of</strong> batch <strong>mixing</strong> plant. Therefore the powerconsumption and CO 2 emission per unit volume <strong>of</strong>production concrete <strong>of</strong> continues <strong>mixing</strong> plant is less
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