Objective
Modern blast-furnaces work with very high temperature and very high pressure blast. To heat this blast to the required temperature the hot-stoves are fed with highly enriched blast-furnace gas, hence the thermal losses by the waste gas are very important.
The aim of this project is to recover a part of the heat of these hot gases to heat the combustion air and the gas in order to increase the efficiency of the hot stoves and to reduce their comsumption of enriched gas.
The actual results obtained are exactly in agreement with predicted savings.
The waste gas heat recovery, to preheat the combustion air and the gas, brings an energy saving of 45 MCAL/T pig iron and a reduction in the coke-oven gas consumption of about 90 MCAL/T pig iron.
This recovery system is set up on the battery of 4 hot stoves of the nr 4 blast-furnace of the Dunkirk steel works. The daily production of this blast-furnace is about 9000 ton of hot metal.
The unit consists of one recovery exchanger placed in the waste gas. The heat transfer surface (10500 m2) of this exchanger is composed of steel tubes with pig iron fins to avoid corrosion by the sulphur. The recovered heat is transferred to the gas and combustion air preheaters by means of a superheated water circuit at 30 bars.
The combustion air and the gas are preheated to 160 deg. C.
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Programme(s)
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Topic(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
59381 Dunkerque Cedex
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.