Energy audit result of Vicem Bim Son Cement JSC

Case study

22/07/2019

Vicem Bim Son Cement JSC specializes in producing, trading, exporting and importing cement, clinker and other construction materials. It has 3 production lines: the Soviet line has stopped working and the third one is equipped with high-tech and high-performance equipment. The company's products meet TCVN, ASTM and EN standards. Main products of the company are clinker, PC40, PCB30, PCB40, Type I, Type II, Cem I 52.5N, Cem II 42.5N cement.

Vicem Bim Son Cement JSC

Energy use situation

Currently, Vicem Bim Son Cement JSCT uses several types of energy such as electricity, coal, oil and LPG.

- Electricity is used for the whole company

- Coal is used for kiln and calciner kilns

- Oil is used for transportation

- LPG is used for canteen.

But coal is the main energy and has the highest rate of consumption.

Energy efficiency potential

According to energy audit results, Vicem Bim Son Cement JSC has huge energy efficiency potential. Carrying out suggested energy efficiency solutions, the company will significantly reduce energy use costs. According to the energy auditors, these are highly feasible and technical solutions.

Particular energy efficiency solutions

7 energy solutions are found during energy audit period including VSD application, adding a new preheater and waste heat recovery generation.

Solution No. 1: Improving performance of the AQC fans by replacing them with the proper capacity ones
Real situation Operating parameters of the AQC fans are much lower than designed ones. Some fans have low damper opening rate.	Expected output Fans are replaced by other ones having a smaller capacity, however, their motors are kept, the damper opening rate increases (to 100%) and the performance of fans improves as well.
Energy efficiency results
Electricity savings: 490,620 kWh/year	Investment cost: VND 1.44 billion
Cost savings: VND 701 million/ year	Payback period: 2.05 years
Solution No. 2: Improving performance of the EP Fan (No.3 line) by installing inverter to control the fan revolution
Real situation The EP Fans (No. 3 line) have high differential pressure (before and after valve) because of low valve opening rate.	Expected output After the installation of inverter to control the fan revolution, the pressure loss through a valve is eliminated.
Energy efficiency results
Electricity savings: 1,650,013 kWh/year	Investment cost: VND 8.212 billion
Cost savings: VND 2.358 billion/year	Payback period: 3.48 years
Solution No. 3: Improving performance of the compressed air system by installing large capacity air compressor with an inverter in the clean room
Real situation The electrical power is used to generate compressed air is 0.216 kWh/Nm3, which is 1.5 times higher than the designed parameter.	Expected output After the existing compressor system is replaced with a new one having a higher efficiency and compressed air pipes improve, the power consumption to generate compressed air reduces remarkably.
Energy efficiency results
Electricity savings: 2,860,000 kWh/year	Investment cost: VND 16 billion
Cost savings: VND 4.087 billion/year	Payback period: 3.91 years

Vicem Bim Son Cement JSC is one of 10 enterprises entitled to energy audit implementation within the framework of the Project for Promoting Investment Market for Energy Efficiency in Industrial Sector in Vietnam, funded by the Korean Government through Korean International Cooperation Agency (KOICA). The energy audit was conducted from September 4, 2018 to September 21, 2018 by Vietnam Technology Solutions JSC (VETS) and Korean energy experts.

Huong Tra

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