US 4,398,501 A · System for recovering latent and sensible heat of effluent gases from a melting installation

Abstract

System for recovering latent and sensible heat of effluent gases from a cupola for cast iron production or other similar melting installation consequent intermittent operation thereof, for obtaining heat energy or potential electric energy in the form of hot water and/or steam, comprising a thermal unit including an air burner and combustion chamber for burning the effluent gases to form hot combustion gases, two vertical waste heat boilers disposed in series along a flow path downstream of the combustion chamber, the first being a water tube boiler and the second being a fire tube boiler, both having vertical tubes arranged so that the hot gases pass upwardly through the water tubes, thereby licking such tubes, and upon flow reversal thence pass downwardly through the fire tubes, thereby enhancing the self-cleaning thereof, an economizer and optionally a combustion air preheater downstream of the second boiler, and a chimney for the fumes at the end of the flow path, as well as a common external steam separator above the boilers and remote from the flow path for recovering steam from and returning water to each of the boilers, plus a vertical tube superheater connected to the steam separator and including a section inside the top part of the first boiler and/or a section between the two boilers, for supplying superheated steam to an electric energy generating turbine, with recycling thereof as feed water to the thermal unit via the economizer.

Claims14

Dependent claims

System for recovering latent and sensible heat of effluent gases from a cupola for cast iron production or from other similar melting installation consequent intermittent operation thereof, for obtaining heat energy or potential electric energy in the form of hot water and/or steam, which comprises a thermal unit and a superheater for producing superheated steam capable of converting the heat energy into electric energy,

the thermal unit including a combustion air burner and a combustion chamber arranged for burning such effluent gases with combustion air to form hot combustion gases therefrom,
two vertical waste heat boilers arranged for independent heat recovery operation and disposed in series along a flow path successively downstream of the burner and combustion chamber for receiving in turn the hot combustion gases from the combustion chamber, the first of said boilers being of the water tube type having vertically arranged water tubes and the second of said boilers being of the fire tube type having vertically arranged fire tubes, and the flow path having a first vertical flow portion containing such water tubes, a second vertical flow portion containing such fire tubes and an intermediate upper interconnecting transitional reverse flow portion between the first and second vertical flow portions for thereby permitting the hot combustion gases flowing along the flow path through the two boilers to flow in an upward direction from bottom to top in the water tube boiler so as to lick the water tubes thereof, thence through the upper interconnecting reverse flow portion and in turn to flow in a downward direction from top to bottom in the fire tube boiler so as to enhance the self-cleaning of the fire tubes thereof, and
a common external steam separator installed above the two boilers and in remote spaced relation to the flow path and operatively respectively connected to the two boilers for correspondingly receiving steam therefrom and returning water thereto.

System for recovering latent and sensible heat of effluent gases from a cupola for cast iron production or from other similar melting installation consequent intermittent operation thereof, for obtaining heat energy or potential electric energy in the form of hot water and/or steam, which comprises a thermal unit and superheater for producing superheated steam capable of converting the heat energy into electric energy,

the thermal unit including a combustion air burner and a combustion chamber arranged for burning such effluent gases with combustion air to form hot combustion gases therefrom,
two vertical waste heat boilers arranged for independent heat recovery operation and disposed in series along a flow path successively downstream of the burner and combustion chamber for receiving in turn the hot combustion gases from the combustion chamber, the first of said boilers being of the water tube type having vertically arranged water tubes and the second of said boilers being of the fire tube type having vertically arranged fire tubes, and the flow path having a first vertical flow portion containing such water tubes, a second vertical flow portion containing such fire tubes and an intermediate upper interconnecting transitional reverse flow portion between the first and second vertical flow portions for thereby permitting the hot combustion gases flowing along the flow path through the two boilers to flow in an upward direction from bottom to top in the water tube boiler so as to lick the water tubes thereof, thence through the upper intermediate reverse flow portion and in turn to flow in the downward direction from top to bottom in the fire tube boiler so as to enhance the self-cleaning of the fire tubes thereof, and
a common external steam separator installed above the two burners and in remote spaced relation to the flow path and operatively respectively connected to the two boilers for correspondingly receiving steam therefrom and returning water thereto,
the superheater being in the form of a steam superheater operatively connected to the steam separator and having vertically arranged superheater tubes installed in the flow path upstream of the fire tube boiler.

1 more element

Dependencies are inferred from the claim text.

System for recovering latent and sensible heat of effluent gases from a melting installation

Life of this patent

System for recovering latent and sensible heat of effluent gases from a melting installation

Life of this patent

Abstract

Claims14