JPH10152710A - Equipment for recovering waste heat or smelting reduction furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equipment which can increase waste heat power generation by utilizing the waste heat of a cooling panel practically difficult to recover and heating water at the outlet side of a steam condensor in a steam turbine, i.e., at the inlet side of an waste heat boiler, in the waste heat recovering equipment of a smelting reduction durance. SOLUTION: The exhaust heat recovering equipment of the smelting reduction furnace which directly produces molten iron or molten pig 6 by adding iron raw material, carbonaceous material and slag-making agent into the furnace body 1 lined on the cooling panel and blowing pure oxygen and/or oxygen- enriched gas and also, vaporizes supplied water with the waste heat boiler 10 by utilizing the heat of combustion gas discharged from the furnace body 1 to recover the steam in a vapor turbine 21. In such a case, a piping at the outlet side of the steam condenser 22 in the steam turbine is connected with the inlet side of the cooling panel and a piping 14 at the outlet side of the cooling panel is connected with the inlet side of a degassing device in the steam turbine and a system for supplying the warm draining water and/or the steam generated in the cooling panel into the deaerating device 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of manufacturing a furnace using an iron raw material,
The present invention relates to a smelting reduction facility for directly producing molten iron or molten iron by adding a carbon material and a slag-making agent and blowing pure oxygen and / or an oxygen-enriched gas.

[0002]

2. Description of the Related Art Smelting reduction involves the use of iron raw materials, carbon materials,
And a slag-making agent is added, and pure oxygen and / or oxygen-enriched gas is blown into the slag to reduce iron oxide in the iron raw material and directly produce molten iron or hot metal. in this way,
A high-temperature combustible gas of about 1600 to 1800 ° C. is generated from the smelting reduction furnace.

Generally, in this type of smelting reduction method, a preliminarily reduced iron raw material, a carbonaceous material, and a solvent are added to a furnace main body, and CO gas and H ₂ gas in a combustible gas generated from the furnace main body are used to remove iron ore. Two-stage method for pre-reduction of stone (for example,
0607, JP-A-61-96019, etc.) and an unreduced iron raw material, a carbonaceous material, and a solvent in the furnace main body, and reduce iron oxide in the iron raw material in the slag, A one-stage method (e.g., power generation) in which CO gas and H ₂ gas in the combustible gas generated from the furnace body are completely burned in a waste heat boiler, and the sensible heat and latent heat of the combustible gas are vaporized and collected. JP-A-1-502276, JP-A-61-279608
And JP-A-60-9815).

[0004] The two-stage method has the advantage of higher energy efficiency than the one-stage method, but requires a preliminary reduction furnace such as a packed-bed system or a fluidized-bed system, so that the equipment is complicated and the capital investment is high. Defects such as the limitation of the shape of the iron raw material due to the uniformity of the reaction in the pre-reduction furnace (for example, only a bulk iron raw material can be used in a packed bed system and only a powdered iron raw material can be used in a fluidized bed system) There is a simple one recently
The column method is attracting attention.

In this one-stage method, the sensible heat and latent heat (about 50 to 60% of the total heat input of the smelting reduction furnace) of a large amount of combustible gas generated from the furnace body are vaporized and recovered, and power is generated. It is important to compensate for the inefficiency of the two-stage method by selling electricity to the outside or using it at other facilities in the factory to reduce the amount of electricity purchased.

In this one-stage method, the rate at which CO gas and H ₂ gas generated in the slag are burned in a furnace space above the slag (hereinafter referred to as a secondary combustion zone) (hereinafter, a secondary combustion rate in the furnace). And the secondary combustion rate in the furnace = (CO ₂ % + H ₂ O%)
_{/ (CO 2% + CO%} + H 2 O% + H 2%) and defined) is raised and the combustion heat that convey useful slag, improve energy efficiency. In other words, it is widely possible to reduce the carbon unit consumption, and at that time, the calorific value of the combustible gas generated from the furnace body, that is, the total of the sensible heat and the latent heat, is reduced by the reduction of the carbon unit consumption. Are known.

However, in the conventional structure in which a refractory is lined on the inner surface of the furnace (for example, Japanese Patent Application Laid-Open Nos. 61-279608 and 60-9815), the secondary combustion rate in the furnace is increased. In this case, the temperature of the atmosphere in the secondary combustion zone rises, the wear of refractories increases extremely, and the cost of hot metal production increases extremely, or the repair frequency of refractories increases, which hinders continuous operation. There were challenges.

Therefore, in order to solve these problems,
A structure in which a cooling panel by hot water cooling is lined in a region facing the secondary combustion zone and the slag on the inner surface of the furnace is disclosed in JP-A-61-1.
23697 and JP-A-1-502276. However, in this method, in order to prevent the rupture of the cooling panel due to local deterioration of the cooling capacity due to the nucleate boiling of the cooling water, and when ordinary industrial water (hard water) is used, lime precipitates. In order to prevent the cooling water from adhering to the inner surface of the cooling panel and lowering the cooling capacity, the outlet temperature of the cooling water needs to be about 70 ° C. or less. About 6 to 10 of calorie
%, There is a problem that it is practically difficult to recover waste heat from the cooling panel.

Further, a method has been considered in which the cooling panel is constituted by a natural circulation boiler, and the waste heat of the cooling panel is recovered as steam to generate power. However, in order to improve the power generation efficiency, the steam in the boiler has to be improved. Pressure about 140kg / cm ²
To increase the risk of water leaking from the cooling panel, which hinders stable operation of the smelting reduction facility. Further, when the waste heat of the cooling panel was recovered as low-pressure steam of about 9 kg / cm ² or less, the demand was small, and the excess was somewhat surplus.

Hereinafter, an example of the prior art will be described in detail with reference to FIG. FIG. 4 is a flowchart of an example of a conventional technique in a waste heat recovery facility of a smelting reduction furnace. The furnace main body 1 is lined with a refractory 2 and a cooling panel 3. At the upper part of the furnace main body 1, a raw material input port 4 for adding an iron raw material, a carbon material, and a slag-making agent, and the combustibility generated from the furnace main body A gas outlet 5 for discharging gas is provided. At the bottom of the furnace body 1 is hot metal 6
The slag 7 having a specific gravity lower than that of the hot metal 6 is stored at an upper portion thereof. The hot metal 6 is continuously or intermittently discharged from the tap hole 8 and the slag 7 is discharged from the slag port 9.

The iron oxide (FeO and Fe ₂ O ₃ ) in the iron raw material supplied from the raw material input port 4
Is reduced in the slag 7 by the reaction represented by the following formulas (1) and (2). FeO + C → Fe + CO (endothermic reaction) (1) Fe ₂ O ₃ + 3C → 2Fe + 3CO (endothermic reaction) (2)

Further, a part of the carbon content in the carbonaceous material supplied from the raw material input port 4 is blown into the slag 7 through the lower tuyere 11 which penetrates through the furnace body 1 and is disposed toward the slag 7. It is oxidized by oxygen and a reaction represented by the following formula (3). C + 1 / 2O ₂ → CO (exothermic reaction) (3)

A part of the carbon content in the carbonaceous material input from the material input port 4 is determined by the following formula (4) ). H ₂ O + C → H ₂ + CO (Endothermic reaction) (4)

The energy efficiency of this smelting reduction furnace, that is, the basic unit of carbon material, is determined by the total amount of carbon necessary for the reactions of the formulas (1), (2), (3) and (4). Therefore, when the water content in the iron raw material, the carbonaceous material, and the slag-making agent input from the raw material input port 4 increases, the carbon content consumed in the expression (3) increases, and the endothermic amount in the expression (3) decreases. Since it increases, the calorific value of equation (4) must be increased to compensate for it, and as a result, equations (1), (2), (3), and (4)
The total amount of carbon required for the reaction increases, and the carbon unit consumption increases. In addition, along with this, the oxygen amount required for the expression (4) and the expressions (5) and (6) described later increases, so that the oxygen intensity decreases.

Further, the above equations (1), (2), (3),
The CO gas, the H ₂ gas, and the hydrogen content in the carbonaceous material generated in the slag 7 by (4) pass through the furnace body 1 and pass through the secondary combustion zone 1.
Oxygen is blown into the secondary combustion zone 10 through the upper tuyere 12 arranged toward zero and is oxidized by a reaction represented by the following formulas (5) and (6). CO + 1 / 2O ₂ → CO ₂ (exothermic reaction) (5) H ₂ + 1 / 2O ₂ → H ₂ O (exothermic reaction) (6)

The reactions of the equations (5) and (6) are referred to as in-furnace secondary combustion, and the degree of the degree of the secondary combustion is represented by the in-furnace secondary combustion rate defined by the following equation (7). It is widely known that the secondary combustion rate is increased by increasing the flow rate of oxygen blown into the secondary combustion zone 10 through the upper tuyere 12. When the secondary combustion rate in the furnace is increased,
Part of the reaction heat of the equations (5) and (6) in the secondary combustion zone 10 is transmitted to the slag 7. In-furnace secondary combustion rate = (CO ₂ % + H ₂ O%) / (CO ₂ % + CO% + H ₂ O% + H ₂ %) (7) where CO _{2 in} equation (7) _{%, CO%, H 2 O} %, H 2
% Indicates the volume fraction of each component of the combustible gas at the gas outlet 6.

On the other hand, the high-temperature combustible gas generated in the furnace main body 1 is guided to the waste heat boiler 16 through the gas discharge port 5 provided in the upper part of the furnace main body 1, and converts the sensible heat and latent heat of the combustible gas. After being vaporized and collected, it is discharged out of the system through an exhaust gas duct 15, a dust collector 17, a blower 18, a chimney 19 and the like.

On the other hand, the steam which has been turned into high pressure steam by the sensible heat and latent heat of the combustible gas in the waste heat boiler 16
0 to the steam turbine 21
And is converted into electric power by a generator 31 connected to the drive shaft. The steam whose energy has been recovered by the steam turbine 21 is cooled to about 40 ° C. by the condenser 22 to become water, and sent to the low-pressure feedwater heater 23 via the condenser pump 29.

The low-pressure feed water heater 23 includes a steam turbine 2
The steam extracted from 1 is sent through the extraction pipe 28-a and heat-exchanges with the water to heat the water to about 85 ° C., and then the heated water is sent to the deaerator 24. .

The steam extracted from the steam turbine 21 is sent to the deaerator 24 through an extraction pipe 28-b, blown into the water, and heats the water to about 140 ° C. After removing the oxygen and the like dissolved in the water, the heated water is pressurized to the steam pressure (for example, about 120 kg / cm ² ) on the outlet side of the waste heat boiler by the boiler water supply pump 25 and then sent to the high pressure water heater 26. .

The high pressure feed water heater 26 has a steam turbine 2
The steam extracted from 1 is sent through the extraction pipe 28-c and exchanges heat with the water to heat the water to about 200 ° C., and then the heated water is sent to the waste heat boiler 16 .

As described above, in order to increase the turbine efficiency, the water on the inlet side of the waste heat boiler 16 is heated by the extracted steam from the steam turbine 21. The amount of heat of this extracted steam is About 1 of the steam calorie of the side
Reaches 5-20%. Therefore, the water on the inlet side of the waste heat boiler is heated by using other waste heat, and the steam turbine 21 is heated.
If the amount of extracted steam from the gas is reduced, the amount of power generation can be increased accordingly.

[0023]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a furnace body lined with a cooling panel with an iron raw material and a carbon material. , And adding a slag-making agent, blowing pure oxygen and / or an oxygen-enriched gas, and in a facility for directly producing molten iron or hot metal, utilizing the waste heat of a cooling panel, which was practically difficult to recover, An object of the present invention is to provide a facility capable of increasing the amount of waste heat power generation by heating water on the condenser outlet side of the steam turbine, that is, on the waste heat boiler inlet side.

[0024]

In order to solve the above-mentioned problems, the present invention provides a furnace body lined with a cooling panel, which comprises adding an iron raw material, a carbonaceous material, and a slag-making agent to pure oxygen and / or slag. Injecting an oxygen-enriched gas to directly produce molten iron or hot metal, and using the heat of the combustible gas discharged from the furnace body to vaporize feed water with a waste heat boiler and recover it with a steam turbine By connecting a condenser outlet pipe of the steam turbine to an inlet of the cooling panel and connecting an outlet pipe of the cooling panel to a deaerator inlet of the steam turbine, The hot waste water and / or steam is supplied to the deaerator. Alternatively, the degasser of the steam turbine and the inlet pipe of the cooling panel are connected via a water pump, and the outlet pipe of the cooling panel is connected to the deaerator, thereby causing the cooling panel. It is characterized in that hot waste water or steam or a mixture of steam and water is supplied to the deaerator.

In the waste heat recovery equipment of the smelting reduction furnace of the present invention, the waste heat of the cooling panel is used to heat the water on the outlet side of the condenser of the steam turbine, ie, on the inlet side of the waste heat boiler. The following operations are provided. It is possible to effectively utilize not only the waste heat of the exhaust gas but also the waste heat of the cooling panel, which was practically difficult to recover. The waste heat of the cooling panel is about 6% of the total heat input of the smelting reduction furnace.
Since the exhaust gas waste heat is about 50 to 60% of the total heat input, the amount of power generated by the steam turbine is 10% as compared with the case where only the exhaust gas waste heat is collected and the cooling panel waste heat is not collected. ~ 20% increase.

The pressure of water or steam in the cooling panel is 4 kg / cm ² or less, and there is little risk of leakage of the cooling panel. Since the cooling panel is cooled by boiler water (pure water) instead of ordinary industrial water (hard water), there is no risk of lime precipitation and cooling ability deterioration due to adhesion to the panel inner surface. Since the cooling panel is cooled by boiler water instead of ordinary industrial water, there is no need to install industrial water cooling equipment.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to the flow chart of the waste heat recovery equipment of the smelting reduction furnace in FIG. In the present embodiment, a waste heat boiler and a steam turbine in which the steam pressure at the outlet of the waste heat boiler is about 120 kg / cm ² are described as an example, but the present invention is also applied to a case where pressure and temperature conditions are different. Needless to say.

The high-pressure steam generated by the sensible heat and latent heat of the combustible gas in the waste heat boiler 16 is guided to a steam turbine 21 through a steam pipe 20 to drive the steam turbine 21 and is connected to a drive shaft thereof. Is converted into electric power by the generator 31. The steam whose energy has been recovered by the steam turbine 21 is cooled to about 40 ° C. by the condenser 22 to become water, and the cooling lined in the furnace main body 1 via the condenser pump 29 and the cooling panel inlet pipe 13. It is sent to panel 3.

In the cooling panel 3, the above-mentioned water is
After heating to 85 ° C., the heated water is sent to a deaerator 24. In this case, the water flowing through the cooling panel 3 is boiler water (pure water) and contains almost no lime,
Even when heated to 70 ° C. or more, there is no concern about lime precipitation and a decrease in cooling ability due to adhesion to the inner surface of the cooling panel.

The steam extracted from the steam turbine 21 is sent to the deaerator 24 through an extraction pipe 28-b, blown into the water, and heats the water to about 140 ° C. After removing the oxygen and the like dissolved in the water, the heated water is pressurized to the steam pressure (for example, about 120 kg / cm ² ) on the outlet side of the waste heat boiler by the boiler water supply pump 25 and then sent to the high pressure water heater 26. .

The high pressure feed water heater 26 has a steam turbine 2
The steam extracted from 1 is sent through the extraction pipe 28-c and exchanges heat with the water to heat the water to about 200 ° C., and then the heated water is sent to the waste heat boiler 16 .

Further, the second embodiment of the present invention is as follows.
This will be described based on the flowchart of the waste heat recovery equipment of the smelting reduction furnace in FIG. The high-pressure steam generated by the sensible heat and latent heat of the combustible gas in the waste heat boiler 16 is supplied to the steam pipe 2.
0 to the steam turbine 21
And is converted into electric power by a generator 31 connected to the drive shaft. The steam whose energy has been recovered by the steam turbine 21 is cooled to about 40 ° C. by the condenser 22 to become water, and sent to the deaerator 24 via the condenser pump 29.

From the boiler water pipe 27 between the condensate pump 29 and the deaerator 24, the cooling panel inlet side pipe 13 is branched and connected, and a part of the water is controlled by the cooling panel water amount control valve 30 to control the water amount. To the cooling panel 3 lined with the furnace body 1.

The cooling panel 3 is composed of a low-pressure boiler. After the water is vaporized at a low pressure in the cooling panel 3, the steam or a mixture of steam and water is removed through a cooling panel outlet pipe 14. It is sent to the porcelain 24. In this case, the steam pressure in the cooling panel 3 is about the pressure in the deaerator 24 (for example, 3.5 kg / cm ² ), and there is little possibility that the cooling panel 3 leaks water. There is no hindrance.

The low-pressure steam is sent to the deaerator 24 through the cooling panel outlet pipe 14, and the condensate pump 2
9 is blown into the water sent directly to the deaerator 24, which heats the water to about 140 ° C. and removes oxygen and the like dissolved in the water, and then the heated water is supplied to the boiler feed pump 2
In step 5, the steam pressure at the outlet side of the waste heat boiler (for example, about 120 kg /
After being pressurized to cm ² ), it is sent to the high pressure feed water heater 26.

The high pressure feed water heater 26 has a steam turbine 2
The steam extracted from 1 is sent through the extraction pipe 28-c and exchanges heat with the water to heat the water to about 200 ° C., and then the heated water is sent to the waste heat boiler 16 .

Further, an embodiment of the present invention will be described with reference to the flow chart of the waste heat recovery equipment of the smelting reduction furnace in FIG. Sensible heat of combustible gas in waste heat boiler 16,
The steam that has been converted into high-pressure steam by the latent heat is guided to a steam turbine 21 through a steam pipe 20 to drive the steam turbine 21 and is converted into electric power by a generator 31 connected to the drive shaft. The steam whose energy has been recovered by the steam turbine 21 is cooled to about 40 ° C. by the condenser 22 to become water, and sent to the deaerator 24 via the condenser pump 29.

From the deaerator 24, the cooling panel inlet pipe 13 is branched and connected. A part of the water is boosted by the cooling panel water pump 32 by the pressure loss of the cooling panel 3, and the cooling panel water amount control valve is provided. At 30, the amount of water is controlled and sent to the cooling panel 3 lined with the furnace body 1.

The cooling panel 3 is composed of a low-pressure boiler. After the above-mentioned water is converted into low-pressure steam in the cooling panel 3, the steam or a mixture of steam and water is again passed through the cooling panel outlet pipe 14. It is sent to the deaerator 24. In this case, the steam pressure in the cooling panel 3 is about the pressure in the deaerator 24 (for example, 3.5 kg / cm ² ), and there is little possibility that the cooling panel 3 leaks water. There is no hindrance.

The water sent from the deaerator 24 to the cooling panel 3 is supplied to the pressure inside the deaerator 24 (for example, about 3.5 kg / c).
m ² ), the steam or the mixture of steam and water sent from the cooling panel 3 to the deaerator 24
Since it is a saturated steam or a mixture of saturated steam and saturated water at a pressure in the inside of the cooling panel 4 (for example, about 3.5 kg / cm ² ), the temperature of the water on the inlet side of the cooling panel 3 and the temperature of the steam on the outlet side are: It is almost the same irrespective of the fluctuation of the heat load of the cooling panel 3.
Therefore, the thermal stress of the cooling panel 3 hardly fluctuates, and a longer life of the cooling panel 3 can be expected.

The low-pressure steam is sent to the deaerator 24 via the cooling panel outlet pipe 14, and the condensate pump 2
9 is blown into the water sent directly to the deaerator 24, which heats the water to about 140 ° C. and removes oxygen and the like dissolved in the water, and then the heated water is supplied to the boiler feed pump 2
In step 5, the steam pressure at the outlet side of the waste heat boiler (for example, about 120 kg /
After being pressurized to cm ² ), it is sent to the high pressure feed water heater 26.

The high pressure feed water heater 26 has a steam turbine 2
The steam extracted from 1 is sent through the extraction pipe 28-c and exchanges heat with the water to heat the water to about 200 ° C., and then the heated water is sent to the waste heat boiler 16 .

In the first embodiment of the present invention, the cooling panel 3 is cooled with hot water, and the hot waste water is discharged to the deaerator 2.
4, the second embodiment of claim 1 and the first of claim 2
In the embodiment, the example in which the cooling panel 3 is steam-cooled and the low-pressure steam is blown into the deaerator 24 has been described. However, the present invention combines both of them, that is, a part of the cooling panel 3 is heated with hot water. While cooling and sending the warm wastewater to the deaerator 24,
Needless to say, the present invention is also applicable to an example in which the other part of the cooling panel 3 is evaporated and cooled, and the low-pressure steam is blown into the deaerator 24 to heat the hot waste water.

[0044]

As described above, in the waste heat recovery equipment for a smelting reduction furnace according to the present invention, the waste heat of the cooling panel is used to utilize the waste heat of the steam turbine, that is, the waste heat boiler inlet. By heating the water, the following effects can be expected.

It is possible to effectively utilize not only the waste heat of the exhaust gas but also the waste heat of the cooling panel, which has been practically difficult to recover. In the prior art, the water on the inlet side of the boiler 16 which has been heated by the extracted steam from the turbine 21 by the low-pressure feed water heater 23 and the deaerator 24 is heated by the waste heat of the water cooling panel 3 in the present invention. As a result, the amount of power generation can be increased by reducing the amount of steam extracted from the turbine 21. The waste heat of the cooling panel is about 6 to 10% of the total heat input of the smelting reduction furnace, and the waste gas waste heat is about 50 to 60% of the total heat input. The amount of power generated by the steam turbine increases by 10 to 20% as compared with the case where heat is not recovered.

The pressure of water or steam in the cooling panel is 4 kg / cm ² or less, and there is little risk of leakage of the cooling panel. Since the cooling panel is cooled by boiler water (pure water) instead of ordinary industrial water (hard water), there is no risk of lime precipitation and cooling ability deterioration due to adhesion to the panel inner surface.

The cooling panel is not a normal industrial water,
Cooling by boiler water eliminates the need to install industrial water cooling equipment. There is almost no change in the thermal stress of the cooling panel, and a longer life of the cooling panel 3 can be expected.

[Brief description of the drawings]

FIG. 1 is a view showing a flow of a first embodiment of a waste heat recovery facility of a smelting reduction furnace according to the present invention (claim 1).

FIG. 2 is a diagram showing a flow of a second embodiment of the waste heat recovery equipment of the smelting reduction furnace according to the present invention (claim 1).

FIG. 3 is a diagram showing a flow of one embodiment of a waste heat recovery facility of a smelting reduction furnace according to the present invention (claim 2).

FIG. 4 is a diagram showing a flow of a waste heat recovery facility of a conventional smelting reduction furnace.

[Explanation of symbols]

 1: Furnace body 2: Refractory 3: Cooling panel 4: Raw material input port 5: Gas discharge port 6: Hot metal 7: Slag 8: Tap hole 9: Slag port 10: Secondary combustion zone 11: Lower tuyere 12 : Upper tuyere 13: Cooling panel inlet side pipe 14: Cooling panel outlet side pipe 15: Exhaust gas duct 16: Waste heat boiler 17: Dust collector 18: Blower 19: Chimney 20: Steam pipe 21: Steam turbine 22: Condenser 23 : Low pressure feed water heater 24: Deaerator 25: Boiler feed water pump 26: High pressure feed water heater 27: Boiler water pipe 28: Bleed pipe 29: Condensate pump 30: Cooling panel water flow control valve 31: Generator

Claims (2)

[Claims] 1. An iron raw material, a carbon material, and a slag-making agent are added to a furnace body lined with a cooling panel, and pure oxygen and / or an oxygen-enriched gas is blown to directly produce molten iron or molten iron. In a facility in which feed water is vaporized by a waste heat boiler using heat of the combustible gas discharged from the furnace body and recovered by a steam turbine, a condenser outlet pipe of the steam turbine is connected to an inlet of the cooling panel. And a system for supplying hot waste water and / or steam generated in the cooling panel to the deaerator by connecting an outlet pipe of the cooling panel to a deaerator inlet of the steam turbine. Waste heat recovery equipment for a smelting reduction furnace. 2. An iron raw material, a carbon material, and a slag-making agent are added to a furnace body lined with a cooling panel, and pure oxygen and / or an oxygen-enriched gas is blown to directly produce molten iron or molten iron. In equipment for vaporizing supply water with a waste heat boiler using heat of the combustible gas discharged from the furnace body and recovering with a steam turbine, a deaerator of the steam turbine and an inlet pipe of the cooling panel are connected. A system for connecting the outlet pipe of the cooling panel to the deaerator, and supplying steam or a mixture of steam and water generated in the cooling panel to the deaerator is provided. Waste heat recovery equipment for a smelting reduction furnace.