Evaluation of Low-temperature Waste Heat Recovery Technologies for the Cement Industry

Clinker production is a high impact process in the cement industry due to the elevated emission of gases and the energy consumption, inherent to the calcination of limestone used as raw material. Clinker manufacture takes place in a kiln system whose configuration varies depending on the technological update. Within the wide spectrum of existing technologies, rotary kiln system will have generally three major heat energy losses: (1) outflow gases after heating the raw material; (2) the air cooler excess required for cooling clinker leaving the furnace tube to handling temperature; and, (3) the radiation through the entire surface of the system. A typical energy balance for a modern kiln, indicates that about 23% of the heat is lost with waste gases, 11% with the cooler excess gas and 10% by radiation throughout the entire system’s surface. In this work, a technical and economic prefeasibility evaluation is developed for a thermal recovery system of wasted heat in a suspension-preheater kiln for clinker production. The alternatives explored are a heat recovery preheating raw material system and power electricity generation using an Organic Rankine Cycle (ORC). The results of the study show the feed-preheating system is the most attractive alternative in comparison with the option to generate electricity. A sensitivity analysis was performed for each alternative considering changes in the profits obtained and the initial investment in equipment required for each alternative. Also, the impact of the existing tax benefits that exists in Colombia is analysed for this kind of effort.

• Record URL:
  https://doi.org/10.2495/ESUS150101
• Availability:
  • Find a library where document is available. Order URL: http://www.witpress.com/books/978-1-84564-944-9
• Supplemental Notes:
  • Abstract reprinted with permission from WIT Press.
• Corporate Authors:

  WIT Press

  Ashurst Lodge
  Ashurst, Southampton  United Kingdom  SO40 7AA
• Authors:
  • Lopera, L
  • Nieto, C
  • Escudero, A C
  • Bustamante, C A
  • Fernández, M C
• Conference:
  • 6th International Conference on Energy and Sustainability
  • Location: Medellin , Colombia
  • Date: 2015-9-2 to 2015-9-4
• Publication Date: 2015

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: 12p
• Monograph Title: Energy and Sustainability VI
• Serial:
  • WIT Transactions on Ecology and the Environment
  • Volume: 195
  • Publisher: WIT Press
  • ISSN: 1743-3541
  • Serial URL: http://www.witpress.com/elibrary/wit-transactions-on-ecology-and-the-environment

Subject/Index Terms

• TRT Terms: Alternate fuels; Cement industry; Clinkers; Energy consumption; Rankine engines; Raw materials; Sensitivity analysis
• Geographic Terms: Columbia
• Subject Areas: Energy; Environment; Highways; Vehicles and Equipment; I15: Environment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 01588332
• Record Type: Publication
• ISBN: 9781845649456
• Files: TRIS
• Created Date: Jan 28 2016 9:01AM