Tag archive for 'GHG intensity'

Coal Efficiency and GHG Intensity Enhancement Potential for the Steel Sector in India

Posted On

This blog post discusses the results of a report written in 2011 by Vivek Gilani and Dr. Amit Garg on the subject of the potential for improving the coal efficiency and GHG intensity of the steel sector in India.

 

Facts:

The domestic cola production target for 2011-12 was 554 mt. India added 1660 MW generation capacity in July of 2011 (all thermal power), and Indian plants exceeded their power generation target that month. Additionally, Coal India Ltd (CIL) reported a 64.06% rise in profit after tax (PAT) during the first quarter (April-June) of 2011-12.

 

India’s coal import in 2011-12 was predicted to be 137.03 mt, with some ports seeing huge increases in the amount of incoming imported coal. The import of coking coal through Paradip port on the eastern coast of India increased from 258,479 in June 2011 to 668,574 in July, an increase of 410,095 tons, or 159%. Imports of PCI coal through Vizag port in July 2011 stood at 113,467 tons, 86,764 tons more than the 26,703 tons imported in June 2011. And the imports of Low Ash Metallurgical (LAM) coke through Paradip port in the month of July 2011 rose sharply to 60,590 tons, compared with 6,000 tons in June 2011

 

Domestic mining has many environmental impacts, including the issue of land usage. 171 coal mining proposals involving 28,862 hectares of forest land are awaiting forestry clearance as of June 30, 2011. 44 projects of Coal India Ltd (CIL) stuck under Comprehensive Environment Pollution India (CEPI) norms introduced b they MoEF.

 

Question:

Can the most efficient users of coal in India’s steel sector help India:

  • increase its energy independence
  • meet its climate change commitments
  • and even save some forests?

 

Trends:

The following chart displays the GHG intensity of production in the Indian steel sector.

GHG Intensity of Production in Sample Steel Companies

As is evident from the results, coking coal is the largest contributor at 40%, with coal being the second largest at 26%. Steam turbines and grid electricity, at 12%, were also significant.

The following table describes the GHG intensity of production in various steel companies throughout the sector.

GHG Intensity of Production in Sample Steel Companies

The following table, on the other hand, depicts the coal efficiency and GHG intensity enhancement of Indian steel companies. In the years 2008-2010, they substantially exceeded their COP15 commitments regarding GHG mitigation.

Coal Efficiency & GHG Intensity Enhancement in Indian Steel CompaniesThe following graph displays the coal savings, GHG intensity reduction, and COP15 commitment opportunities of the steel sector for the same years.

Steel Sector Coal Savings, GHG Intensity Reduction, and COP15 Commitment Opportunities

The following chart displays the abatement potential for India’s steel sector for each measure, along with the necessary assumptions. Potentially, the 2030 projected emissions of 735 million tons of CO2e per year could be reduced to 573 million tons. Energy efficiency processes alone have an abatement potential of 73 million tons, shifting to scrap-based EAF has a potential of 21 million tons, and shifting to gas-based DRI, 17 million tons.

Emissions and abatement potential for India's steel sector by category

Measures:

  • Energy Efficiency can be improved through improving processes, namely sinter plant heat recovery and coal moisture control. Pulverized coal injection, coke dry quenching, and recovering waste heat also helps optimize energy use.
  • Savings can come from shifting fuel as well, substituting coke used in BF/BOF furnaces with fuel based on biomass (charcoal). Replacing 10% of coke as the primary blast furnace tool can also make a very sizable contribution.
  • Technology chances can have a big impact. One example is direct smelting, which removes the need for coking plants. (There are issues with these technologies that need to be resolved, of course). Another is scrap-based steel making, which uses 1/3 of the energy required by standard blast furnaces. The issue here is that if 10% of the total production moved to this system, 70% of India’s steel would need to be recycled, which would come with an economic cost. Lastly, gas-based direct reduced iron and cogeneration, i.e. recovering gas from the BOF/BF process and cleaning and using it for power generation, can also help to reduce emissions.

 

Energy independence and the Indian steel sector:

Coking coal prices were $129 a ton in 2009-10 but increased to $225 a ton in the second quarter beginning in July 2010. India has a very high dependency on Australia for coking coal and would need 2.4 billion tonnes of steel/yr by 2030, meaning India would need to import 40% of its coal needs.

 

Conclusion/way forward:

The best practice gap was achieved by the cement industry in its production from coal, increasing the GHG intensity ration from 13.4 to 15.7 in 3 years. Best practice technology (BPT) replication is achievable using off-the-shelf technologies in India. BPT replication in Steel Industry alone can yield 36 million tons of coal savings and reduce India’s imports drastically as well as help India achieve more than 100% of its GHG emissions commitment to COP15 (reducing the GHG intensity of GDP by 20%-25% by 2020). We are not anti-coal as fuel but, rather, a rational promoter of the roadmap to use India’s and the globe’s diminishing coal supplies more efficiently. The most pressing needs are process optimization technology sharing throughout the steel industry and active promotion and incentivization of efficient users of coal and low-GHG intensity steel on platforms such as coal junction and metal junction.

 

The original report can be read here.

 

Bibo Water Carbon Footprint Project

Posted On

Bibo Water commissioned Vivek Gilani of cBalance to conduct a GHG inventory of their operations. The results are displayed in this blog post.

Project Scope

Activity Boundaries:

The following tables lists activities that were mapped as part of the inventory project and their scope:

Bibo Water GHG Inventory Activity Boundary Summary

Life cycle Boundaries:

While many activities resulted in direct emissions (Scope 1), some resulted in indirect emissions through the generation of electricity (Scope 2), and the emissions caused by the production of goods used (Scope 3) must be included as well in a GHG inventory. The emissions of the latter group were calculated using the life cycle assessment.

Bibo Water GHG Inventory Emission Factor LCA Status

Stakeholder Boundaries:

Bibo Water’s physical and operational boundaries were mapped to develop a list of relevant stakeholders (internal process groups) and include their activities (i.e. direct emissions from within the boundary as well as the consumption of goods and services produced elsewhere) as part of the GHG inventory. These boundaries are summarized in the table below:

Bibo Water GHG Inventory Stakeholder Boundary Summary

Resources

Resource Consumption Inventory:

Activity data was collected in order to record the consumption of resources for the months of December 2008, February 2009, and May 2009 and was then extrapolated linearly for an 12 month period.

Bibo Water GHG Inventory Resource Consumption Inventory

GHG Inventory and Analysis:

A customized carbon ERP model was developed specifically for the project, and using the appropriate GHG emission factors, a GHG inventory was calculated. The following table summarizes the results:

Bibo Water GHG Inventory Annual Carbon Footprint Summary

The pie chart below categorizes the total carbon footprint by activity. Electricity consumption for plant production and administrative activities had by far the greatest impact, followed by emissions from distribution logistics and Scope 3 emissions from plastic use for product packaging.

Bibo Water GHG Inventory Activity Contributions to Total Carbon Footprint

 

The next pie chart breaks down the total carbon footprint by stakeholder (i.e. internal process groups in this project) contribution. The internal processes resulting in the greatest impact in terms of absolute magnitude (proportional to quantity of water production) were the production facility at Marvel, followed by Sangareddy and Vandana.

Bibo Water GHG Inventory Stakeholder Contributions to Total Carbon Footprint

The GHG intensity of production across the various facilities and product lines was also analyzed. The results are displayed in the graph below. Retail production below 2 liter capacity bottles resulted in a significantly higher GHG intensity compared to the bulk production facilities/processes. Amongst the retail units, the Marvel 1 liter production line resulted in the lowest GHG intensity per liter (0.08 kg CO2e/liter) while the highest was the retail production of 300 ml bottles at Marvel. In terms of bulk production, the most efficient production unit was the 20 L production system at Sangareddy (0.005 kgCO2e/liter). The primary reason for the lower GHG intensity of retail vs. bulk units was the re-use of packaging in the case of bulk jars versus single-use PET bottles for retail packaging.

Bibo Water GHG Inventory Comparison - Plant Production

A corresponding trend, mirroring the trend of GHG intensity of Retail Production (below 2 liter capacity bottles) relative to the bulk production facilities/processes, was observed in the context of GHG intensity of logistics operations; logistics for retail units exhibited significantly greater GHG intensity compared to bulk units. The primary reason for the lower GHG intensity of logistics for retail vs. bulk logistics is the smaller network coverage (within the urban center) of the bulk operations relative to the state-wide logistics operations involved in the case of retail units. Furthermore, fuel efficiency of vehicle types used for the retail versus bulk lines had a significant impact on the consequent GHG intensity of logistics operations. The results are shown in the graph below.

Bibo Water GHG Inventory Comparison - Logistics

 

The following two graphs show the carbon footprint of the different product lines broken down by activity group.

Bibo Water GHG Inventory Product Line Carbon Footprint Comparison - Activity Group Distribution

 

Bibo Water GHG Inventory Logistics Carbon Footprint Comparison - Activity Group Distribution

 

The original report can be read here.

Categories