CN114196793A

CN114196793A - Gas iron bath heating method, heating reforming method and gas-based shaft furnace reduction system thereof

Info

Publication number: CN114196793A
Application number: CN202110986193.2A
Authority: CN
Inventors: 张春雷; 张力元
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-03-18

Abstract

The invention discloses a heating method and a heating reforming method of gas-based shaft furnace reducing gas and a gas-based shaft furnace reducing system thereof, belonging to the fields of chemical industry and metallurgy. A gas is blown into an iron bath furnace, the gas is contacted with molten iron, when the gas is a non-hydrocarbon reducing gas, the molten iron is used as a heat source for heating the gas, when the gas is a hydrocarbon-rich gas, the molten iron is used as a heat source for heating the gas and also as a catalyst for reforming the gas, and the heated or heated and reformed gas is discharged from a gas outlet of the iron bath furnace. The invention has simple equipment, low investment and operation cost and no CO emission in heating gas₂And NO_x。

Description

Gas iron bath heating method, heating reforming method and gas-based shaft furnace reduction system thereof

Technical Field

The invention belongs to the fields of chemical industry and metallurgy, and particularly relates to an iron bath heating reforming method of gas and a gas-based shaft furnace reduction system thereof.

Background

The gas heating and reforming method adopted by the direct reduction of chemical industry and gas-based shaft furnaces at present comprises a radiant tube heating method, a catalytic and non-catalytic partial oxidation method. These processes have at least one of the following disadvantages: (1) the heating pipe is high temperature resistant and expensive, and a single heater usually needs hundreds of heating pipes, so that the investment is large; (2) the heating by external heat combustion discharges a large amount of CO₂And NOx; (3) the used catalyst is expensive and needs to be replaced periodically, so that the operation cost is increased; (4) the hydrocarbon gas is heated and reformed by pure oxygen combustion, so that the investment for oxygen production and the operating cost for oxygen consumption are increased.

Such as, application number: CN201910952204.8 entitled, a new reforming furnace for producing reducing gas, which is a reforming furnace comprising a radiant chamber box, reforming furnace tubes, burners, a transition section and a convection section, proposes that the main problem of gas-based reduced iron (commonly known as sponge iron) is to solve the production of reducing gas; the reforming furnace tubes are arranged in 2m rows and are vertically arranged in the radiation chamber box body in parallel; one row of reforming furnace tubes corresponds to one reforming raw material gas inlet branch trunk tube, each reforming raw material gas inlet branch tube is provided with branches with the same number as that of each row of reforming furnace tubes, and the gas inlets of the reforming furnace tubes are connected with the reforming raw material gas inlet branch trunk tube through flexible tubes; the burners are arranged in a (2m +1) way and are arranged on the bottom wall plate below the radiation chamber; the gas outlet of the reforming furnace tube is connected with the cold wall branch pipe through an inclined tee; the transition section is that a plurality of transition section branch pipes are arranged above two side wall plates of the radiation chamber box body and led out to a transition section branch main pipe, and the two transition section branch main pipes are converged into a transition section main pipe at one end of the radiation chamber box body; the transition section header pipe is connected with the convection section, and the convection section is connected with the chimney through the induced draft fan; the convection section consists of more than or equal to 4 heat exchangers, and the heat exchangers are at least 4 of a flash evaporator, a reforming raw material preheater, a steam superheater, a desulfurization coke oven gas preheater, a top gas preheater and a combustion air preheater. The high temperature flue gas with 1200 ℃ at the outlet of the transition section recovers heat through the convection section, so that the temperature of the flue gas is reduced to be below 100 ℃.

The technical scheme has the following problems: (1) the fuel is adopted for combustion and heating to cause exhaust emission; (2) because the reforming tubes are externally heated, the diameter of the reforming tubes is limited, and the volume of a single reforming tube is small and the number of the reforming tubes is large. As can be seen from the drawing of the patent, there are 70 reforming tubes 162 and 70 burners. This results in a large and complex radiant chamber heating system equipment; (3) the outlet temperature of the transition section is as high as 1200 ℃, which means that the temperature born by the reforming furnace tube is higher than 1200 ℃, the price of the reforming furnace tube and the combustor is very expensive, and a set of reforming furnace equipment usually needs hundreds of reforming furnace tubes, so the investment is overlarge; (4) the catalyst is expensive, the using amount is large, and the catalyst needs to be replaced periodically, so that the production and operation cost is high; (5) the transition section and the convection section for discharging the flue gas and utilizing the waste heat of the flue gas have large equipment and complex structure, and the investment cost is increased again.

Disclosure of Invention

In order to solve the technical problems, the invention provides a gas iron bath heating method, a reforming method and a gas-based shaft furnace reduction system thereof. The invention aims to reduce investment and not discharge CO when heating gas₂And NO_xThe equipment has simple structure, does not use oxygen and has low operation cost. Other objects of the present invention will be pointed out hereinafter or will be apparent to those skilled in the art.

In order to realize the purpose, the iron bath heating reforming method adopts the following technical scheme:

the gas contains at least one hydrocarbon-rich gas, the gas is blown into the iron bath furnace, the gas contacts with the iron liquid, the iron liquid is used as a heat source for heating the gas and a catalyst for reforming the gas, and the heated and reformed gas is discharged from the gas outlet of the iron bath furnace.

Compared with the prior art, the iron bath heating reforming method has the following beneficial effects:

1) the invention adopts iron bath to heat and reform hydrocarbon-containing gas, iron liquid is used as a heat source for heating the gas, and no CO is generated in the heating process₂And NO_xAnd (4) discharging.

2) The iron liquid is used as a heat source for heating gas and a catalyst for reforming gas, is derived from waste steel, is low in price, low in iron liquid loss, reusable and extremely low in operation cost.

3) The iron bath furnace is mainly made of refractory materials, and has low material cost and simple structure, so the investment is low.

4) The temperature of the iron liquid in the iron bath furnace is 1450-1600 ℃, so hydrocarbon gas is reformed at the temperature of more than 1200 ℃, and oxygen is not needed for temperature increase.

The preferred scheme of the iron liquid source of the invention is as follows:

the iron melt is supplied by inductively heating iron charge in the iron bath furnace by means of an electromagnetic induction coil surrounding the body of the iron bath furnace, or is obtained by continuously feeding iron melt from outside the iron bath furnace. For example, the iron bath furnace is connected to an intermediate frequency furnace or an electric arc furnace, and molten iron is continuously supplied from the intermediate frequency furnace or the electric arc furnace to the iron bath furnace.

Further, for the iron bath furnace equipped with the induction coil, a scrap inlet and a slag discharge port are installed, the scrap inlet is used for adding scrap to supplement molten iron, and scrap and impurities carried by gas are periodically discharged from the slag discharge port.

Further, for the iron bath furnace to which the molten iron is continuously added from the outside of the iron bath furnace, an inlet and an outlet for the molten iron are installed to ensure the addition of new molten iron.

In the present invention, the gas stream is contacted with the molten iron, preferably by gas impinging on the surface of the molten iron from above the surface.

Preferably, when reforming the hydrocarbon gas, steam and/or carbon dioxide are mixed into the hydrocarbon gas.

In order to realize the purpose, the iron bath heating method adopts the following technical scheme:

a method for heating a gas in an iron bath, wherein the gas is a non-hydrocarbon reducing gas, the gas is blown into an iron bath furnace, the gas is brought into contact with molten iron, the molten iron is used as a heat source for heating the gas, and the heated gas is discharged from a gas outlet of the iron bath furnace.

Compared with the prior art, the iron bath heating method has the following beneficial effects:

1) the invention adopts iron bath to heat the non-hydrocarbon reducing gas, and no CO is generated in the heating process₂And NO_xAnd (4) discharging.

2) The iron bath furnace is mainly made of refractory materials, and has low material cost and simple structure, so the investment of the heating furnace is low.

3) The temperature of the iron liquid in the iron bath is 1450-1600 ℃, so the gas is heated to more than 1000 ℃, and oxygen is not needed for temperature increase.

In order to realize the aim, the gas-based shaft furnace reduction system adopts the following technical scheme:

the utility model provides a gas base shaft furnace reduction system, includes gas base shaft furnace, gas heating furnace or gaseous heating reforming furnace, and wherein gas heating furnace or gaseous heating reforming furnace adopt the iron bath stove, and the iron bath stove includes the furnace body, electromagnetic induction coil, spray gun, intermediate frequency power, and gas discharge port, and electromagnetic induction coil twines on the furnace body, and the spray gun inserts the stove from iron bath stove upper portion or side, and the gas discharge port is located furnace body upper portion, and intermediate frequency power connects induction coil.

Compared with the prior art, the gas-based shaft furnace reduction system has the following beneficial effects:

1) the invention adopts iron bath heating or heating reforming gas-based shaft furnace reducing gas, the iron liquid is used as the heat source of the heating gas, the iron liquid is electrically heated, and no CO is generated in the heating process₂And NO_xAnd (4) discharging.

2) The iron liquid is used as a heat source for heating gas and a catalyst for reforming the gas, is derived from waste steel, is low in price, almost has no loss, can be repeatedly used, and is extremely low in operation cost.

3) The iron bath furnace is mainly made of refractory materials, and has low material cost and simple structure, so the investment of the heating furnace is low.

4) The temperature of the iron liquid in the iron bath is 1450-1600 ℃, so no matter the non-hydrocarbon gas is heated to more than 1000 ℃ or the hydrocarbon gas is heated to more than 1200 ℃ for reforming, oxygen addition and temperature increase are not needed.

Furthermore, the upper part or the side surface of the iron bath furnace is also provided with a gas cooling spray gun. Normal temperature hydrocarbon gas and/or non-hydrocarbon gas are sprayed out by the cooling spray gun, the high temperature gas heated by molten iron is cooled to 900-1100 ℃, and the requirement of the gas-based shaft furnace on the gas temperature is met.

The gas-based shaft furnace reduction system at least needs two iron bath furnaces for gas heating, one furnace is opened and the other furnace is prepared.

Drawings

FIG. 1 is a schematic view of a first iron bath furnace for heating a gas or heating a reformed gas according to the present invention;

FIG. 2 is a schematic view of a second iron bath furnace for heating a gas or heating a reformed gas according to the present invention;

FIG. 3 is a schematic view of a third iron bath furnace for heating a gas or heating a reformed gas according to the present invention;

FIG. 4 is a schematic view showing the structure of a fourth iron bath furnace for heating a gas or a reformed gas according to the present invention;

FIG. 5 is a first reduction system of the gas based shaft furnace of the present invention;

FIG. 6 is a second reduction system of the gas based shaft furnace of the present invention;

FIG. 7 is a third reduction system of the gas based shaft furnace of the present invention;

FIG. 8 is a fourth reduction system of the gas based shaft furnace of the present invention;

labeled as: 1-an iron bath furnace, 2-a gas-based shaft furnace, 3-a dust remover, 4-a carbon dioxide removing device, 5-a dehydrating device, 6-an electric arc furnace, 7-a raw material gas, 8-a humidifier, 11-a valve on a pipeline of the iron bath furnace communicated with the gas-based shaft furnace, 12-a first spray gun, 13-a second spray gun, 14-molten iron, 15-an iron bath furnace exhaust port, 16-an iron bath furnace body, 17-an electromagnetic induction coil, 18-a scrap steel inlet, 19-a slag exhaust port, 31-top gas for fuel gas after dust removal, 32-top gas for carbon dioxide removal after dust removal, 33-top gas mixed with the raw material gas after dust removal, 61-an electrode, 62-a communication passage of the iron bath furnace and the molten iron, 63-an iron bath furnace iron discharge port, 64-an electric arc furnace platform, 71-humidified raw material gas.

Detailed Description

The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.

Referring to fig. 1, fig. 1 is a schematic view of a first iron bath furnace for heating gas or heating reformed gas according to the present invention. The iron bath furnace 1 comprises a furnace body 16, a first spray gun 12, a gas outlet 15 and an electromagnetic induction coil 17, wherein the first spray gun 12 is inserted into the furnace from the side surface of the furnace body 16 of the iron bath furnace, the number of the first spray guns 12 is not less than 1, n first spray guns 12 are uniformly arranged around the furnace body 16 of the iron bath furnace, the gas outlet 15 is positioned at the upper part of the furnace body 16, molten iron 14 is stored at the middle lower part of the furnace body 16, and the electromagnetic induction coil 17 is wound on the furnace body 16. For example, the iron bath furnace 1 heats the gas H₂When qi goes on, H is converted₂Blowing into the iron bath furnace 1 through two spray guns one 12, H₂The gas contacts with the molten iron 14, and the molten iron 14 rapidly discharges H₂Gas heating, heated H₂Gas is discharged from a gas outlet 15 of the iron bath furnace, and H is discharged₂The gas temperature is about 1300 ℃ and the pressure is 0.15 MPa. The first lance 12 may be inserted into the molten iron 14, preferably the first lance 12 is above the level of the molten iron, using H₂The gas impacts the liquid surface of the molten iron 14 from the upper surface of the molten iron 14 in a contact mode, so that the height of the head of the first spray gun 12, which is higher than that of the molten iron 14, is avoidedAnd (4) warm erosion. When the temperature of the molten iron 14 is lower than 1450 ℃, the electromagnetic induction coil 17 starts to heat the molten iron 14 in the iron bath furnace 1 until the temperature of the molten iron 14 reaches 1500 ℃, and the work is stopped.

Referring to FIG. 2, FIG. 2 is a schematic view of a second iron bath furnace for heating a gas or a reformed gas according to the present invention. The structure of the iron bath furnace in figure 2 is different from that of the iron bath furnace in figure 1 in that a second spray gun 13 is added, the second spray gun 13 is inserted into the furnace from the side surface of the iron bath furnace body 16, and the second spray gun 13 is a gas cooling spray gun. The number of the second spray guns 13 is more than or equal to 1, the n second spray guns 13 are uniformly arranged around the iron bath furnace body 16, normal-temperature hydrocarbon gas and/or non-hydrocarbon gas are sprayed out by the cooling spray guns, and high-temperature gas which is sprayed out by the first spray guns 12 and is heated by molten iron is cooled to 900-1100 ℃ to meet the requirement of the gas-based shaft furnace on the gas temperature. For example, the iron bath furnace 1 heats the gas H₂H blown out from the first spray gun 12 when mixed with CO gas₂The gas mixture with CO is heated by contact with the molten iron 14, and then the gas flows upwards, and H is generated₂The temperature of the mixed gas with CO reaches 1400 ℃, and the mixed gas meets H blown out from a second spray gun 13₂And CO, heating the mixed gas while lowering the temperature of the mixed gas. The two-flow mixed gas is discharged from a gas outlet 15 of the iron bath furnace, the temperature of the discharged mixed gas is about 950 ℃, and the pressure is 0.25 MPa. When the temperature of the molten iron 14 is lower than 1500 ℃, the electromagnetic induction coil 17 starts to heat the molten iron 14 in the iron bath furnace 1 until the temperature of the molten iron 14 reaches 1550 ℃, and the work is stopped.

Referring to FIG. 3, FIG. 3 is a schematic view of a third iron bath furnace for heating a gas or a reformed gas according to the present invention. FIG. 3 is different from the iron bath furnace of FIG. 2 in the structure in which a scrap inlet 18 and a slag discharge port 19 are added. The scrap inlet 18 is used to add make-up iron and slag 191 formed from scrap and gas-entrained impurities is periodically discharged from the slag discharge 19.

Referring to fig. 1, when heating and reforming natural gas, steam is added into the natural gas or the natural gas is humidified and uniformly mixed, then the mixed gas of the natural gas and the steam is blown into an iron bath furnace 1 through a first spray gun 12, the mixed gas of the natural gas and the steam is contacted with molten iron 14, the spray gun head keeps a certain distance from the molten iron, the molten iron 14 rapidly heats the mixed gas, and meanwhile, the mixed gas is heated in the ironCatalytically, the methane in the natural gas reacts with water and is reformed into H₂And CO, and the heated mixed gas is discharged from a gas outlet 15 of the iron bath furnace, and the temperature of the discharged mixed gas is about 1350 ℃ and the pressure is 0.4 MPa. When the temperature of the molten iron 14 is lower than 1550 ℃, the electromagnetic induction coil 17 starts to heat the molten iron 14 in the iron bath furnace 1, and the work is stopped until the temperature of the molten iron 14 reaches 1600 ℃.

Referring to fig. 2, when heating and reforming coke oven gas, firstly adding steam into the coke oven gas, uniformly mixing, then blowing the mixed gas of the coke oven gas and the steam into an iron bath furnace 1 through a spray gun I12, enabling the mixed gas of the coke oven gas and the steam to be in contact with molten iron 14, keeping a certain distance between the spray gun head and the molten iron, rapidly heating the mixed gas through the molten iron 14, and simultaneously reacting hydrocarbon components in the coke oven gas with water under the catalysis of the molten iron to reform the hydrocarbon components into H₂And CO, the reformed coke oven gas flows upwards, and when the temperature reaches 1350 ℃, the reformed coke oven gas meets the second flow of the coke oven gas mixed with steam blown out from the second spray gun 13, and is heated and partially reformed, and the temperature of the coke oven gas is reduced. The two-flow mixed gas is discharged from a gas outlet 15 of the iron bath furnace, the temperature of the discharged mixed gas is about 1050 ℃, and the pressure is 0.35 MPa. When the temperature of the molten iron 14 is lower than 1550 ℃, the electromagnetic induction coil 17 starts to heat the molten iron 4 in the iron bath furnace 1, and the work is stopped until the temperature of the molten iron 14 reaches 1600 ℃. The coke oven gas blown out of the second spray gun 13 can also be top gas after dust removal of the gas-based shaft furnace, the top gas is heated by the coke oven gas, and CO in the top gas is simultaneously₂The reforming of the unreformed hydrocarbons in the coke oven gas continues. The two-flow mixed gas is discharged from a gas outlet 15 of the iron bath furnace, and the temperature of the discharged mixed gas is about 980 ℃ and the pressure is 0.35 MPa.

Referring to FIG. 4, FIG. 4 is a schematic view of a fourth iron bath furnace for heating a gas or a reformed gas according to the present invention. The difference between the structure of the iron bath furnace shown in FIG. 4 and that of the iron bath furnace shown in FIG. 1 is that the electromagnetic induction coil heating system is removed, the iron tap hole 63 of the iron bath furnace, the iron bath furnace and electric arc furnace molten iron communicating passage 62, the electric arc furnace 6, the electrode 61 and the electric arc furnace platform 64 are added, the electric arc furnace 6 continuously adds the heated molten iron 14 into the iron bath furnace 1 through the iron bath furnace and electric arc furnace molten iron communicating passage 62, new heat energy is provided for the iron bath furnace 1, and the temperature is loweredThe hot molten iron 14 flows into the molten iron tank through the iron discharging port 63 of the iron bath furnace, the molten iron tank pours the molten iron 14 into the electric arc furnace 6, the heating is continued, and the circulation is carried out, so that new hot molten iron 14 is provided for the iron bath furnace 1. For example, when heating and reforming the coal bed gas, firstly adding steam into the coal bed gas, uniformly mixing, then blowing the mixed gas of the coal bed gas and the steam into the iron bath furnace 1 through the first spray gun 12, enabling the mixed gas of the coal bed gas and the steam to be in contact with the molten iron 14, keeping a certain distance between the spray gun head and the molten iron, rapidly heating the mixed gas by the molten iron 14, and simultaneously reforming the methane in the coal bed gas into H under the catalysis of iron₂And CO, and the heated mixed gas is discharged from a gas outlet 15 of the iron bath furnace, and the temperature of the discharged mixed gas is about 1320 ℃, and the pressure is 0.18 MPa. The temperature of the hot metal is controlled between 1550 ℃ and 1600 ℃ by controlling the rate of flow of the hot metal 14 into and out of the iron bath furnace 1 and the temperature at which the electric arc furnace 6 heats the hot metal.

Referring to fig. 5 and 1, fig. 5 shows a reduction system of the gas-based shaft furnace of the present invention. The gas heating reforming furnace adopts an iron bath furnace 1, the iron bath furnace 1 comprises a furnace body 16, an electromagnetic induction coil 17, a first spray gun 12, a medium-frequency power supply and a gas outlet 15, the electromagnetic induction coil 17 is wound on the furnace body 16, the first spray gun 12 is inserted into the furnace from the upper part or the side surface of the iron bath furnace 1, the gas outlet 15 is positioned on the upper part of the furnace body 16, and the medium-frequency power supply is connected with the induction coil 17. Two iron bath furnaces 1 are connected in parallel and then communicated with a tuyere of a gas-based shaft furnace 2, and a valve 11 is respectively arranged on a parallel pipeline and used for controlling the two iron bath furnaces 1 to heat raw material gas, one is opened and the other is prepared. When the raw material gas is natural gas, one part of the top gas of the gas-based shaft furnace 2 passes through the dust remover 3 to be supplied as fuel gas 31, the other part of the top gas is taken as recycled raw material gas 32, is continuously subjected to carbon dioxide removal through the carbon dioxide removal device 4, is mixed with natural gas at 1350 ℃ after being heated and reformed in the iron bath furnace 1, and the mixed gas enters the gas-based shaft furnace 2 at the temperature of 1000 ℃ and the pressure of 0.4 MPa.

Referring to fig. 6 and 1, fig. 6 is a second reduction system of the gas-based shaft furnace of the present invention. Comprises a gas-based shaft furnace and a gas heating furnace, wherein the gas heating furnace adopts an iron bath furnace 1, the iron bath furnace 1 comprises a furnace body 16, an electromagnetic induction coil 17, a spray gun I12 and intermediate frequency electricityThe electromagnetic induction coil 17 is wound on the furnace body 16, the first spray gun 12 is inserted into the iron bath furnace 1 from the upper part or the side surface, the gas outlet 15 is positioned at the upper part of the furnace body 16, and the intermediate frequency power supply is connected with the induction coil 17. Three iron bath furnaces 1 are connected in parallel and then communicated with the air port of the gas-based shaft furnace 2, and a valve 11 is respectively arranged on each parallel pipeline and used for controlling two switches to be used for one standby when the three iron bath furnaces 1 heat the raw material gas. When the raw material gas is H₂When in gas supply, the top gas of the gas-based shaft furnace 2 passes through a dust remover 3 and a dewatering device 5, and then the pressure is adjusted to 1300 ℃ H after being heated by the iron bath furnace 1₂Mixing the gas, reducing the temperature to 1100 ℃ after mixing, and feeding the gas into a gas-based shaft furnace 2.

Referring to fig. 7 and 2, fig. 7 shows a third reduction system of the gas-based shaft furnace of the present invention. The gas heating reforming furnace is an iron bath furnace 1, and the iron bath furnace 1 comprises a furnace body 16, an electromagnetic induction coil 17, a first spray gun 12, a second spray gun 13, a medium-frequency power supply, a gas outlet 15, a scrap inlet 18 and a slag outlet 19. An electromagnetic induction coil 17 is wound on a furnace body 16, a first spray gun 12 and a second spray gun 13 are inserted into the furnace from the upper part or the side surface of the iron bath furnace 1, a gas outlet 15 is positioned at the upper part of the furnace body 16, an intermediate frequency power supply is connected with the induction coil 17, a scrap inlet 18 is used for adding scrap to supplement iron liquid, and slag formed by the scrap and impurities carried by the gas is periodically discharged from a slag outlet 19. Three iron bath furnaces 1 are connected in parallel and then communicated with a tuyere of a gas-based shaft furnace 2, and a valve 11 is respectively arranged on each parallel pipeline and used for controlling two of the three iron bath furnaces 1 to be opened and standby when the three iron bath furnaces 1 heat raw material gas. When the raw material gas is coke oven gas, the top gas of the gas-based shaft furnace 2 is processed by the dust remover 3 to form fuel gas for the coke oven to be used as fuel gas, and the coke oven gas heated and partially reformed by the two iron bath furnaces 1 enters the gas-based shaft furnace 2 at the temperature of about 1050 ℃.

Referring to fig. 8 and 4, fig. 8 is a fourth reduction system of the gas-based shaft furnace of the present invention. Comprises a gas-based shaft furnace and a gas heating reforming furnace, wherein the gas heating reforming furnace adopts an iron bath furnace 1, and the iron bath furnace 1 is provided with molten iron 14 by an electric arc furnace 6. The iron bath furnace 1 comprises a furnace body 16, an iron tap hole 63 of the iron bath furnace, an iron liquid communication passage 62 of the iron bath furnace and an electric arc furnace, a spray gun 12, and gasA body outlet 15, the first spray gun 12 is inserted into the iron bath furnace 1 from the upper part or the side surface, and the gas outlet 15 is positioned at the upper part of the furnace body 16. The electric arc furnace 6 continuously adds the heated molten iron 14 into the iron bath furnace 1 through the iron bath furnace and the electric arc furnace molten iron communicating passage 62 to provide new heat energy for the iron bath furnace 1, the cooled molten iron 14 flows into the molten iron tank through the iron discharging port 63 of the iron bath furnace, the molten iron tank pours the molten iron 14 into the electric arc furnace 6 again, the heating is continued, and the circulation is carried out, so that new hot molten iron 14 is provided for the iron bath furnace 1. Two iron bath furnaces 1 are connected in parallel and then communicated with a tuyere of a gas-based shaft furnace 2, and a valve 11 is respectively arranged on a parallel pipeline and used for controlling the two iron bath furnaces 1 to heat raw material gas, one is opened and the other is prepared. When the raw material gas 7 is coke oven gas, one part of the top gas of the gas-based shaft furnace 2 is supplied outside as fuel gas 31 after passing through the dust remover 3, the raw material gas (coke oven gas) 7 passes through the compressor and the humidifier 8, the formed humidified raw material gas (coke oven gas) 71 is mixed with the second part of the top gas 33 after dust removal, the mixture is sprayed into the iron bath furnace 1, the mixture is contacted with molten iron 14, the spray gun head keeps a certain distance from the molten iron, the molten iron 14 rapidly heats the mixture, and simultaneously hydrocarbon components in the coke oven gas are catalyzed by iron and are mixed with CO in the top gas 33₂And H brought in from the humidifier 8₂O is reacted and reformed to H₂And CO, and the heated mixed gas is discharged from a gas outlet 15 of the iron bath furnace, and the temperature of the discharged mixed gas is about 1350 ℃ and the pressure is 0.18 MPa. The temperature of the discharged mixed gas is about 1350 ℃, and the temperature can be reduced by adopting two modes, thereby meeting the temperature requirement of the gas-based shaft furnace on the reducing gas. In the first mode, the third part of the top gas 32 after dust removal passes through the decarbonizing device 4 and is mixed with the gas at about 1350 ℃ discharged from the iron bath furnace 1, and the temperature of the mixed gas is reduced to 1010 ℃, and then the mixed gas enters the gas-based shaft furnace 2: in the second mode, the humidified raw material gas (coke oven gas) 71 formed by passing through the compressor and the humidifier 8 is directly mixed with the gas of about 1350 ℃ discharged from the iron bath furnace 1, and the temperature of the mixed gas is reduced to 1050 ℃ and then the mixed gas enters the gas-based shaft furnace 2.

The above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.

Claims

1. A process for the heated reforming of a gas containing at least one hydrocarbon-rich gas in an iron bath, characterized in that the gas is blown into an iron bath furnace, the gas is brought into contact with an iron bath, the iron bath serves as a heat source for heating the gas and as a catalyst for reforming the gas, and the heated and reformed gas is discharged from a gas outlet of the iron bath furnace.

2. The method according to claim 1, wherein the liquid iron is obtained by induction heating of iron in the iron bath furnace by an electromagnetic induction coil surrounding the body of the iron bath furnace.

3. The process according to claim 1, wherein the liquid iron is continuously fed from outside the iron bath.

4. The process according to claim 2, wherein the iron bath furnace is provided with a scrap inlet and a slag discharge.

5. The method of claim 3, wherein the iron bath furnace is provided with an inlet and an outlet for the molten iron.

6. A process according to claim 1, wherein the gas stream is heated and reformed by the liquid iron by impinging the liquid iron from above.

7. A process according to claim 1, wherein steam and/or carbon dioxide is mixed into the hydrocarbon-rich gas.

8. A method for heating a gas in an iron bath, the gas being a non-hydrocarbon reducing gas, characterized in that the gas is blown into an iron bath furnace, the gas is brought into contact with molten iron, the molten iron serves as a heat source for heating the gas, and the heated gas is discharged from a gas outlet of the iron bath furnace.

9. The utility model provides a gas base shaft furnace reduction system, includes gas base shaft furnace, gas heating furnace or gaseous heating reforming furnace, its characterized in that gas heating furnace or gaseous heating reforming furnace adopt the iron bath stove, and the iron bath stove includes the furnace body, electromagnetic induction coil, spray gun, intermediate frequency power and gas discharge port, and electromagnetic induction coil twines on the furnace body, and the spray gun inserts in the stove from iron bath stove upper portion or side, and the gas discharge port is located furnace body upper portion, and intermediate frequency power connects induction coil.

10. A gas-based shaft furnace reduction system according to claim 9, wherein a gas cooling lance is further provided at the upper part or side of the iron bath furnace.