Thursday, 07/11/2024 | 23:28 GMT+7
Energy audit result of Vicem Hai Phong Cement Company Limited
20/08/2019
| Solution No. 1: Circulating AQC hot air to primary air to improve the kiln and the calciner performance | |
Real situation Currently, primary air whose temperature is about 30oC from the outside is directly taken into the kiln and calciner. | Expected output When a part of AQC hot air is supplied to primary air for calciner and main burner, it enables to reduce coal consumption. |
| Energy efficiency results | |
| Coal savings: 1,281.54 tons/year | Investment cost: VND 5.25 billion |
| Cost savings: VND 2.589 billion/ year | Payback period: 2.03 years |
| Solution No. 2: Adding the 6th stage of preheater to improve heat exchange efficiency in preheater tower | |
Real situation The exhausted gas from the 5-stage preheater is being emitted to EP at the temperature of about 364°C. | Expected output The addition of an extra pre-heater step may reduce the amount of heat available for material drying in the raw mills, consequently, the coal consumption decreases. |
| Energy efficiency results | |
| Coal savings: 2,371.2 tons/year | Investment cost: VND 13.65 billion |
| Cost savings: VND 3.32 billion/year | Payback period: 4.11 years |
Solution No. 3: Waste Heat Recovery Power Generation Option 1A: Steam Cycle with Cooling Tower | |
Real situation Currently, the enterprise has taken advantage of a part of waste heat to provide for the process of crushing coal and cement. However, due to the high temperature of the flue gas (about 330oC - 365oC), there is still huge energy efficiency potential. | Expected output The solutions leads to energy savings of 5,655 toe/year và a reduction of 29,886 tons of CO2/year. |
| Energy efficiency results | |
| Electricity savings: 36,652,200 kWh/year | Investment cost: VND 291.958 billion |
| Cost savings: VND57.54 billion/year | Payback period: 4.43 years |
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