THERMIE BM./00188/96 Electricity production (10 MWe) by combustion process of agro-forestry biomass at Umbertide

Contacts




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Electricity : Forestry : JOULE/THERMIE Programme : Solid Biofuels : Thermochemical Conversion : Wood (Lignocellulose)

	Type of Project	Shared Cost
	Contract No	BM./00188/96
	Total Cost	15,490,000 ECU
	EC Contribution	1,539,930 ECU
	Start Date
	Duration

Electricity production (10 MW_e) by combustion process of agro-forestry biomass at Umbertide

Objectives

The aim of the project is the implementation of a demonstration power plant with a capacity of 10 MW_e. It will be fed with agro-forestry residues, woody products and straw, as well as dedicated energy crops, to be built in a rural area of Central Italy (Umbria), using an innovative combustion technology, circulating fluidised bed boiler/steam turbine generator (CYMIC). CYMIC has been built in one first demonstration unit in Finland (8 MW_e), burning peat and bark. The proposed plant will be an extension to 10 MW_e and will make use of straw and fibres together with woody material. It will introduce a global innovative system of mixed fuel production, logistics and handling for large-scale energy production to determine the fuel flexibility that is an important feature of the CFB technology. The project will study the possibility of significant variations in the properties between different fuel lots, especially in respect of ash and physical properties. Researches on straw bu rning have already been done in a pilot plant in Finland; not yet straw and woody material have been combusted in a commercial unit like the one proposed.

Project Description

Innovative Technology

The technology selected is a CFB boiler of innovative concept (CYMIC), where the cyclone is located inside the furnace; with the new concept the boiler is more compact and the problem related to operations and maintenance of the heavy refractories are avoided. Further this new concept reduces the dimension of the plant, facilitating heat transfer and temperature control. In the new CYMIC design cyclone and the furnace are totally water-cooled operating in natural circulation. In CYMIC combustion occurs in the ring area, which is left between furnace walls and the round cyclone in the middle. Fluidising air is blown from the bottom. Secondary air, is fed above the bed and helps keeping the combustion temperature down and constant during the circulation, controlling the NO_x formation and preventing ash melting. Good environmental properties, good combustion efficiency (99%) and multifuel capability are also features of CYMIC boilers. In the part there will be two fuelling lines, one for wo od and the second one for the straw. Finnish technology will provide the fed line of woody materials, while Danish technology will provide straw handling and feeding systems. For energy crops the suitability for the feeding will be tested during demonstration; For the flue gas cleaning an electrostatic precipitator is used, and than discharged to the air through a 40 m high stack; the fly ashes will be used as fertilisers as well as the coarse bottom ash.

Context

The proposed plant will be constructed in a rural area of Central Italy where forestry and agro-residues are available in large quantities. also cereals straw are available. The electricity produced will be sold to the national grid, while heat will be used partly for district heating, partly for industrial processes.

State of Advancement

Ongoing: The project is at the design phase.

Contacts

Coordinator

• G. BERNA / Antiche Terre ITALY