Manufacturing cement is energy-intensive because of the significant heat required to produce it from raw materials. Producing a ton of cement requires 60-130 kilograms of fuel and 110 kWh of electricity, which together generate nearly one metric ton of greenhouse gas (GHG) emissions.i
Dalmia Cement (“Dalmia”) is one of the largest cement producers in India with installed capacity of 24 million tonnes. Strategic acquisitions, mergers, and greenfield installations have helped the company to mark new markets and strengthen its presence in existing markets in India. Dalmia Cement is a member company of the Cement Sustainability Initiative, United Nations Global Compact, and Caring for Climate initiative of United Nations. Dalmia’s key drivers for continual performance improvement include a desire to manage energy costs, be prepared for future regulations, and be a responsible business through voluntary actions.
Response — Greenhouse Gas Emissions (Cement Production)
Since 2011ii, Dalmia Cement has measured and managed energy consumption in its production facility at Ariyalur. In 2014 and 2015, the company implemented the following practices to improve efficiency:
- Ensured that the rotary kiln is highly utilized whenever running to reduce radiation losses.
- Ensured that raw materials going into the rotary kiln are uniform and homogenous.
- Reduced excess air in the system so that energy is not wasted.
Results — Greenhouse Gas Emissions (Cement Production)iii
In absolute terms, GHG emissions from these sources have increased approximately 69 percent compared to a 2010 baseline due to increased production, though they declined approximately 4 percent between 2013 and 2014. Between 2010 and 2014, efficiency improved by approximately 37% (GHGs/clinker production volume) at the production facilities. This improvement in efficiency has allowed Dalmia to avoid approximately $46.6 million in costs and approximately 311,000 metric tons of GHG emissions since 2010.
|Dalmia Cement — Cement Production GHG Efficiency (2010 Baseline)iv|
|Avoided GHGs (metric tons)||30,800||91,600||83,900||104,500||311,000|
Response — Greenhouse Gas Emissions (Captive Power Plant)
In 2014, Dalmia Cement continued to actively measure and manage energy efficiency in its captive power plant as part of the Green Solutions Platform. This work included improving the efficiency of power production, which is measured in heat rate (kcal/kWh), and the use of auxiliary power. In 2014, the company implemented the following practices to improve efficiency:
- Optimized combustion efficiency in the boiler.
- Reduced thermal losses by adding improved insulation.
- Moved to optimal air-fuel ratios to get to lower heat rates.
Results — Greenhouse Gas Emissions (Captive Power Plant)v
In absolute terms, GHG emissions resulting from auxiliary power use in the active power plant have increased approximately 13 percent compared to a 2010 baseline due to increased production. Over the same time period, efficiency has improved by approximately 24 percent (GHGs/volume of energy produced) at the captive power plant. This improvement in efficiency has allowed Dalmia to avoid approximately $578,000 in costs and 9,100 metric tons in GHG emissions since 2010
In absolute terms, GHG emissions from the captive power plant associated with power generation increased an estimated 48 percent since 2010 due to an increase in production. Over the same time period, efficiency improved by 6 percent (kcal/kWh). As a result of this efficiency improvement, Dalmia was able to avoid approximately $2.9 million in costs and 39,000 metric tons of GHG emissions since 2010.
|Dalmia Cement — Cement Production Auxiliary Power GHG Efficiency (2010 Baseline)|
|Avoided GHGs (metric tons)||1,200||1,100||1,500||5,300||9,100|
|Dalmia Cement — Cement Production Heat Rate GHG Efficiency (2010 Baseline)|
|Avoided GHGs (metric tons)||7,500||9,000||12,500||10,000||39,000|
Dalmia Cement participated in the Green Portfolio Program, joining the effort in 2011. For more information on Dalmia’s Corporate Social Responsibility efforts, visit the company’s website.