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Italian tannin company Ledoga opts for cogeneration
08 May 2017

Ledoga Srl operates from its head offices and plant in San Michele Mondovì, a town in Italy’s Piedmont region, and is a global leader in the production of chestnut tannin for the tanning industry, where it is used to produce high-quality leather.

The company

Ledoga is part of the Silvateam Group, a family-owned multinational and world leader in vegetable tannin production, with plants in Italy, Argentina and Peru. The Group also owns companies in China, Brazil and the United States and serves the food (pectin and tara gum), feed (animal nutrition) and energy industries as well. 

Chestnut tannin production is an ancient activity that looks to the future. The production process involves using just chipped virgin timber and countercurrent flow of hot water to extract the tannins from the wood. Tannin is used in leather tanning to give the hides flexibility, fastness to light and abrasion resistance, all of which are essential characteristics in the shoe industry. In Italy, Ledoga has a reputation of excellence in this sector but also as a wood pellet manufacturer. Pellet production, in fact, closes the company’s industrial cycle, which is a virtuous one given that the pellets are made out of the tannin-free wood chips that remain after the extraction process.

The solution
Due to the fact that these production processes consume large amounts of electrical and thermal energy and the skyrocketing costs of energy sources in these last few years, especially in Italy, Ledoga turned to Gruppo AB to build a cogeneration plant from the ECOMAX® Natural Gas line right inside its production facility in San Michele Mondovì (Cuneo province), investing a whopping 4.5 million euros in the project.
The plant is a natural gas-fired ECOMAX® 27 NGS, a modular solution in a container with heating power input of 5,970 kW, rated electrical power of 2,668 kW and cogenerated thermal power of 3,006 kW.

The electrical energy produced is entirely self-consumed; any excess is fed back into the grid. In addition to containing energy resource procurement costs, cogeneration has allowed Ledoga to achieve total thermal energy self-sufficiency and partially go off the electrical grid. The plant, in fact, not only covers the facility’s electrical needs but also produces heat in the form of steam and hot water, both of which are introduced into the facility’s utility supply systems for use in the initial processing of the wood and in the washing and final drying of the pellets. The new plant saves approximately 5,000 tonnes of CO2 emissions per year and, in terms of the Group’s operations, nearly 8,200 hours/year.

Features of the plant

  • LCV methane: 9.5 kWh/Nm3
  • Natural gas consumption: 628 Nm3/h
  • Input power: 5,970 kW
  • Mechanical power supplied: 2,745 kWe
  • Electrical power supplied: 2,668 kWe
  • Potential thermal power recovery from engine cooling (hot water): 3,006 kWt
  • Electrical yield: 44.7%
  • Thermal yield: 50.3%
  • Overall yield: 95%

Supporting materials
Click here to watch the Ledoga case study.

{slider= Contact details}
Caio Pezzola
Marketing Director
+39 030 994 2485
This email address is being protected from spambots. You need JavaScript enabled to view it.
Company: AB
Website: www.gruppoab.com
Twitter address: @AB_Cogeneration
Linkedin address: AB

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