Method and apparatus for supplying blast to a blast furnace
AssigneePrimetals Technologies, Limited
InventorPaul Mark Geach
Life of this patent
Estimating the term…
Abstract
Apparatus for supplying blast to a blast furnace (1) having a plurality of hot blast stoves (4, 5, 6), each stove including a cold blast inlet, a fuel inlet, an air supply inlet, a hot blast outlet, and a waste gas outlet; a waste heat recovery unit (30) connected to a fuel supply, the stove fuel inlet and the cold blast inlet. The stove waste gas outlets are connected to the cold blast inlets, whereby stove waste gas from one stove (5) is supplied, via the waste heat recovery unit, as cold blast to another stove (4).
Claims12
An apparatus for supplying blast to a blast furnace, the apparatus comprising:
- a plurality of hot blast stoves, each stove comprising a cold blast inlet, a fuel inlet, an air supply inlet, a hot blast outlet, and one or more waste gas outlets;
- a waste heat recovery unit connected to a fuel supply, connected to the stove waste gas outlets, directly connected to the stove fuel inlets and connected to the cold blast inlets;
- and
- a compressor connecting the stove waste gas outlets to the cold blast inlets, whereby stove waste gas from one stove is supplied, via the waste heat recovery unit and the compressor, as cold blast to another stove.
An apparatus for supplying blast to a blast furnace, the apparatus comprising:
- a plurality of hot blast stoves, each stove comprising a cold blast inlet, a fuel inlet, an air supply inlet, a hot blast outlet, and one or more waste gas outlets;
- a waste heat recovery unit connected to a fuel supply, the stove waste gas outlets, the stove fuel inlets and the cold blast inlets;
- a compressor connecting the stove waste gas outlets to the cold blast inlets, whereby stove waste gas from one stove is supplied, via the waste heat recovery unit and the compressor, as cold blast to another stove;
- and
- a CO regenerator located and configured to regenerate CO from CO2 in the hot blast outlet of one of the stoves before the hot blast enters the blast furnace.
A method of supplying blast to a blast furnace, comprising:
- extracting stove waste gas from a first hot blast stove;
- cooling the extracted waste gas in a waste heat recovery unit;
- and
- pressurising the cooled gas;
- supplying the cooled pressurised waste gas to a second hot blast stove as cold blast;
- heating the cold blast in the second stove and supplying the heated cold blast as hot blast to the blast furnace,
- wherein the waste heat recovery unit is directly connected to fuel inlets of the first hot blast stove and the second hot blast stove.
A method of supplying blast to a blast furnace, comprising:
- extracting stove waste gas from a first hot blast stove;
- cooling the extracted waste gas in a waste heat recovery unit;
- pressurising the cooled gas;
- supplying the cooled pressurised waste gas to a second hot blast stove as cold blast;
- heating the cold blast in the second stove and supplying the heated cold blast as hot blast to the blast furnace;
- and
- supplying cleaned top gas from the blast furnace to the waste heat recovery unit to heat the cleaned top gas in the waste heat recovery unit using the heat from cooling the stove waste gas;
- and supplying the heated cleaned top gas to a stove as fuel.
Dependencies are inferred from the claim text.