Energy audit result of Vicem Hai Phong Cement Company Limited
Thứ ba, 20/08/2019
Vicem Hai Phong Cement Company Limited specializes in clinker and cement production. The company has rotary kilns which are the most modern cement production line in Vietnam.
Vicem Hai Phong Cement Company Limited specializes in clinker and cement production. The company has rotary kilns which are the most modern cement production line in Vietnam. They have separate clinker and additive grinding technologies helping control grades of cement.
The company's main products include PCB30 cement, PCB40 cement and other customized cement.
Energy use situation
Vicem Hai Phong Cement Company Limited uses different types of energy including electricity, coal, gasoline, oil and LPG. Coal including 3b Coal and 3c coal are primary fuel.
Energy efficiency potential
Energy audit results show that Vicem Hai Phong Cement Company Limited has huge energy efficiency potential. Proposed energy efficiency solutions, including waste heat recovery, can lead to energy cost savings of VND 80.15 billion.
Particular energy efficiency solutions
16 energy solutions are found during energy audit period including pump system improvement, reinforce insulation, adding a new preheater, waste heat recovery generation.
| 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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