Waste Heat Recovery Power Plant
Cement manufacturing is an energy-intensive process. Power represents one of the largest costs of production. Persistent power crisis in the country necessitated a shift from conventional fossil fuels to alternate energy solutions. As part of its strategy to reduce its reliance on the national grid, your Company set up waste heat recovery power plants at Chakwal, Hattar, Farooqia and Kallar Kahar plant sites. Bestway’s WHRP plant at Chakwal was the first in the cement industry of Pakistan prompting others to follow suit.
This is an important step in energy conservation for Bestway Cement Limited, making it a forerunner in adopting WHR technology at all four operations. These projects serve to significantly reduce the Company’s dependence on external source of electricity thus helping in reduction of production costs, improving operational efficiency and protecting the environment.
This energy system recovers heat of fuel gases of cement Pyro-process to generate electricity using heat recovery steam generators. It produces 16 MW/hr Electricity by utilizing fuel gases, currently our country has large shortfall of power and this waste heat recovery system plays important role to compensate power crisis.
As Waste Heat Recovery Power Generation consumes no fuel, there is no greenhouse gas emission in the process. At the same time, the dust emission and temperature of discharged fuel gas is further lowered thus having a positive impact on the environment. The WHRPP has enabled Bestway to significantly reduce its reliance on external source of power.
Bestway's Waste Heat Recovery Project conforms to the CDM (Clean Development Mechanism) and has been successfully registered with UNFCCC (United Nations Framework Convention on Climate Change) making Bestway the 1st in the cement industry and only the 9th company in Pakistan to have achieved this landmark.
Waste Heat Recovery for Power Generation
Waste heat from kilns (pre-heater exit gas and cooler exhaust air) is used for Power Generation by using a steam cycle, an organic Rankin cycle. The low temperature level of the waste heat in cement plants (300 – 450 °C) limits the efficiency to a maximum of 25 – 30%. However, 25 to 30% of plant's power demand can be met through generating power from waste heat recovery power plant which in results lowers the 30% load on National Grid.
Components of Waste Heat Recovery Power Plant
Steam Turbine:
The steam turbine is a dual pressure, single cylinder, series flow, multi stage (12 stages), impulse condensing steam turbine & it forms a complete set of power generating equipment with boiler, generator & auxiliary equipment. Its power generating capacity is 16MW/hr and its make is Chinese (Nanjing Turbine Nanjing and Electrical Machinery Group. Co Ltd).
Waste Heat Exchangers/Boilers:
4 No’s of Waste heat boilers were installed in 2009 to generate steam for power generation (2 Waste Heat Boilers on each kiln)
AQC-I & II (Capacity 14.5 Ton/hr each) Boiler Maker is Chinese Company NANTONG WANDA BOILER CO.LTD
PH-I & II (Capacity 24.1 Ton/hr each) Boiler maker is Chinese Company NANTONG WANDA BOILER CO.LTD
Coal Fire Boiler:
2 No’s of CFB’s Installed in September 2013. These 2 Coal fire boilers taken in service when 1 kiln is stopped as per planned due to maintenance work / due to power short fall.
CFB-I & II boilers capacity is 25Ton/Hr each and its Chinese make is Shandong Huayuan.