CN117925934B - Reducing gas temperature raising device, hydrogen-based smelting system and reducing gas temperature raising method - Google Patents
Reducing gas temperature raising device, hydrogen-based smelting system and reducing gas temperature raising method Download PDFInfo
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- CN117925934B CN117925934B CN202410324423.2A CN202410324423A CN117925934B CN 117925934 B CN117925934 B CN 117925934B CN 202410324423 A CN202410324423 A CN 202410324423A CN 117925934 B CN117925934 B CN 117925934B
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- 239000007789 gas Substances 0.000 title claims abstract description 357
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 71
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000003723 Smelting Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 157
- 239000001301 oxygen Substances 0.000 claims abstract description 157
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 157
- 238000010438 heat treatment Methods 0.000 claims abstract description 110
- 238000002485 combustion reaction Methods 0.000 claims abstract description 26
- 239000007921 spray Substances 0.000 claims description 35
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- 238000009413 insulation Methods 0.000 claims description 8
- 239000011819 refractory material Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 13
- 238000005272 metallurgy Methods 0.000 abstract description 2
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- 229910000831 Steel Inorganic materials 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
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- 229910001341 Crude steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
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Abstract
The invention relates to the technical field of metallurgy, and discloses a reducing gas temperature raising device, a hydrogen-based smelting system and a reducing gas temperature raising method. In the use process of the reducing gas temperature raising device provided by the invention, the air inlet and the air outlet are opened, and the reducing gas to be heated is supplied into the heating space; oxygen is supplied into the heating space through the oxygen supply assembly to heat the reducing gas to be heated by combustion of a part of the reducing gas. The reducing gas temperature raising device provided by the embodiment of the invention can be combined with a heating furnace for use, so that the reducing gas can be subjected to two-stage heating, and the reducing gas with higher temperature can be obtained.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a reducing gas temperature raising device, a hydrogen-based smelting system and a reducing gas temperature raising method.
Background
The steel production is mainly carried out by a blast furnace-converter long process, the crude steel output in 2022 years is 10.13 hundred million t, the carbon emission amount accounts for 15% of the total national carbon emission amount, the method is one of the industry industries with the largest carbon emission amount, and the mismatch between the green development level and the ecological environment requirement is the main contradiction faced by the steel industry. Hydrogen energy is considered as the most potential clean energy source, and the development of hydrogen energy has become a global consensus. The direct reduction process of the hydrogen-based shaft furnace using the hydrogen-rich gas or the pure hydrogen as the reducing gas is a hot spot developed at home and abroad, and because the direct reduction process can be used for smelting at a lower temperature, a coking device and a sintering device with huge pollutant discharge amount are not required to be constructed, so that the energy saving and environment protection advantages of the direct reduction process are highlighted.
The production of the hydrogen-based shaft furnace needs to take high-temperature and high-pressure reducing gas as a reducing agent to produce direct reduced iron, and the temperature of the reducing gas needs to be increased as much as possible in order to ensure the yield index of the hydrogen-based shaft furnace. In the prior art, the reducing gas is generally heated in a heating furnace in an indirect heating mode, but is limited by the physical and chemical properties of the heating furnace tube, and the reducing gas can only be heated to about 950 ℃. In order to further improve the temperature of the reducing gas, a device for further heating the high-temperature high-pressure reducing gas is usually arranged at the rear end of the heating furnace, and at present, the existing devices at home and abroad have the characteristics of complex structure and easy burning-through of equipment, so that the manufacturing cost of the equipment is high, the operation is complex, the core part of the heater is required to be replaced by frequent furnace shutdown, the production of the subsequent hydrogen-based shaft furnace is influenced, and the production cost is greatly increased.
The chinese patent application CN114990336a discloses a preheating reduction device and a preheating reduction method, which have low heating efficiency, complex structure, easy damage and high maintenance frequency.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the invention provides a reducing gas temperature raising device.
In a second aspect, the invention provides a hydrogen-based smelting system.
A third aspect of the invention provides a reducing gas warming method.
In view of this, a first aspect of an embodiment of the present invention provides a reducing gas temperature raising device, including:
the heating device comprises a furnace body, wherein a heating space is formed in the furnace body, and an air inlet and an air outlet are respectively arranged at two ends of the furnace body;
The output end of the oxygen supply assembly is communicated with the heating space, and the oxygen supply assembly and the air inlet are arranged on the same side of the furnace body;
And the output end of the fuel gas supply assembly is communicated with the heating space.
In one possible embodiment, the oxygen supply assembly comprises:
An oxygen supply pipe;
the oxygen surrounding pipe is arranged on one side of the furnace body, the oxygen surrounding pipe and the air inlet are arranged on the same side of the furnace body, and the oxygen supply pipeline is communicated with the oxygen surrounding pipe;
one end of the oxygen spray pipe is communicated with the oxygen surrounding pipe, and the other end of the oxygen spray pipe is communicated with the heating space;
The first control valve is arranged on the oxygen supply pipeline;
and the first flowmeter is arranged on the oxygen supply pipeline.
In a possible embodiment, the oxygen nozzles are a plurality of, and the plurality of oxygen nozzles are arranged at intervals.
In one possible embodiment, the gas supply assembly comprises:
a gas pipeline;
The gas surrounding pipe is arranged on one side of the furnace body, the gas surrounding pipe and the air inlet are arranged on the same side of the furnace body, and the gas pipeline is communicated with the gas surrounding pipe;
one end of the gas spray pipe is communicated with the gas surrounding pipe, and the other end of the gas spray pipe is communicated with the heating space;
The second control valve is arranged on the gas pipeline;
and the second flowmeter is arranged on the gas pipeline.
In one possible embodiment, the gas nozzles are a plurality of, and the plurality of gas nozzles are arranged at intervals.
In a possible embodiment, the oxygen enclosure is arranged in a ring shape, and the oxygen enclosure is arranged concentrically with the air inlet;
the gas enclosure pipe is annularly arranged, and the gas enclosure pipe and the air inlet are concentrically arranged.
In one possible embodiment, the reducing gas temperature raising device further includes:
the heat insulation layer is anchored on the outer wall of the furnace body;
wherein the inner wall of the furnace body is formed by building refractory materials;
wherein the air inlet and the air outlet are made of high-temperature resistant alloy materials.
According to a second aspect of an embodiment of the present invention, there is provided a hydrogen-based smelting system including:
The reducing gas temperature raising device according to any one of the above-described aspects;
the heating furnace is used for primarily heating the reducing gas, the output end of the heating furnace is communicated with the reducing gas temperature-raising device, and the reducing gas temperature-raising device is used for reheating the reducing gas;
And the output end of the reducing gas temperature raising device is communicated with the hydrogen-based shaft furnace.
According to a third aspect of the embodiment of the present invention, a reducing gas temperature raising method is provided, and is applied to the reducing gas temperature raising device according to any one of the above technical solutions, where the reducing gas temperature raising method includes:
Opening the air inlet and the air outlet, and supplying reducing gas to be heated into the heating space;
supplying oxygen into the heating space through the oxygen supply assembly so as to heat the reducing gas to be heated through combustion of part of the reducing gas;
And when the temperature of the reducing gas output through the gas outlet is lower than a first threshold value, supplying fuel gas into the heating space through the fuel gas supply assembly so as to heat the reducing gas to be heated through combustion of the fuel gas.
In a possible embodiment, the oxygen supply assembly is controlled to be turned off when the supply temperature of the reducing gas to be heated via the gas inlet is lower than a second threshold value;
Controlling the ratio of the supply volume of oxygen to the volume of hydrogen in the reducing gas to be heated to be less than or equal to 4%;
Controlling the supply pressure of the oxygen to be larger than the supply pressure of the reducing gas to be heated;
And controlling the supply pressure of the fuel gas to be larger than the supply pressure of the reducing gas to be heated.
Compared with the prior art, the invention at least comprises the following beneficial effects:
The reducing gas temperature raising device provided by the embodiment of the application comprises a furnace body and an oxygen supply assembly, and the inventor finds that the reason for the phenomenon is that the hydrogen is quickly lowered due to heat absorption of hydrogen reduction after entering a hydrogen-based vertical furnace in consideration of the fact that the hydrogen consumption in the working process of a hydrogen-based smelting system in the prior art is far greater than that in the smelting reduction reaction, and the reducing gas far higher than the chemical demand is required to be introduced to bring in enough heat to maintain product indexes, so that the excessive hydrogen only has the effect of carrying heat energy, and the waste of hydrogen energy and the rise of smelting cost are caused. In the use process of the reducing gas temperature raising device provided by the embodiment of the application, the air inlet and the air outlet are opened, and the reducing gas to be heated is supplied into the heating space; oxygen is supplied into the heating space through the oxygen supply assembly so as to heat the reducing gas to be heated through combustion of part of the reducing gas; when the temperature of the reducing gas output through the gas outlet is lower than a first threshold value, gas is supplied into the heating space through the gas supply assembly so as to heat the reducing gas to be heated through combustion of the gas, and on the basis, the reducing gas with higher temperature can be output to the hydrogen-based shaft furnace through the gas outlet, so that the reducing gas can carry more heat energy into the hydrogen-based shaft furnace, and the consumption of the reducing gas can be reduced while the smelting production is ensured. The reducing gas temperature raising device provided by the embodiment of the application is combined with the heating furnace, so that the reducing gas can be subjected to two-stage heating, the indirect heating arrangement of the heating furnace can be made up, the reducing gas with higher temperature can be obtained, and meanwhile, the reducing gas temperature raising device provided by the embodiment of the application has the advantages of simple structure, low production cost and low burning-through probability, and the service life of the reducing gas temperature raising device can be prolonged by utilizing the combustion of part of the reducing gas or the combustion of fuel gas.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic view of one angle of a reducing gas temperature raising apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic block diagram of another angle of a reducing gas temperature raising apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a hydrogen-based smelting system according to one embodiment of the present invention;
Fig. 4 is a schematic step flow diagram of a reducing gas temperature raising method according to an embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 to 3 is:
The device comprises a furnace body 1, a heating space 2, an oxygen supply pipeline 3, an oxygen surrounding pipe 4, an oxygen spray pipe 5, a gas pipeline 6, a gas surrounding pipe 7, a gas spray pipe 8, a gas inlet 9, a gas outlet 10, a control system 11, a first control valve 12, a second control valve 13, a first flowmeter 14, a second flowmeter 15 and a heat insulation layer 16;
21 heating furnace, 22 hydrogen-based shaft furnace.
Detailed Description
In order to better understand the above technical solutions, the following detailed description of the technical solutions of the embodiments of the present invention is made by using the accompanying drawings and the specific embodiments, and it should be understood that the specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the embodiments of the present invention, and not limit the technical solutions of the present invention, and the technical features of the embodiments of the present invention may be combined with each other without conflict.
As shown in fig. 1 and2, a reducing gas temperature raising apparatus according to a first aspect of an embodiment of the present invention includes: the heating furnace comprises a furnace body 1, wherein a heating space 2 is formed in the furnace body 1, and an air inlet 9 and an air outlet 10 are respectively arranged at two ends of the furnace body 1; the output end of the oxygen supply assembly is communicated with the heating space 2, and the oxygen supply assembly and the air inlet 9 are arranged on the same side of the furnace body 1; and the output end of the fuel gas supply assembly is communicated with the heating space 2.
The reducing gas temperature raising device provided by the embodiment of the invention comprises the furnace body 1 and the oxygen supply assembly, and the inventor finds that the reason for generating the phenomenon is that the temperature of the hydrogen entering the hydrogen-based shaft furnace is too low, and excessive hydrogen only can play a role in carrying heat energy, so that the waste of hydrogen energy and the rise of smelting cost are caused, in consideration of the fact that the hydrogen consumption of a hydrogen-based smelting system in the prior art is far greater than the hydrogen consumption in the smelting reduction reaction in the working process. In the use process of the reducing gas temperature raising device provided by the embodiment of the invention, the gas inlet 9 and the gas outlet 10 are opened, and the reducing gas to be heated is supplied into the heating space 2; oxygen is supplied into the heating space 2 through the oxygen supply means to heat the reducing gas to be heated by combustion of a part of the reducing gas; when the temperature of the reducing gas output through the gas outlet 10 is lower than the first threshold value, gas is supplied into the heating space 2 through the gas supply assembly to heat the reducing gas to be heated through combustion of the gas, and on the basis, the reducing gas with higher temperature can be output to the hydrogen-based shaft furnace through the gas outlet 10, so that the reducing gas can carry more heat energy into the hydrogen-based shaft furnace, and the consumption of the reducing gas can be reduced while the smelting production is ensured. The reducing gas temperature raising device provided by the embodiment of the invention is combined with the heating furnace, so that the reducing gas can be subjected to two-stage heating, the arrangement of indirect heating of the heating furnace can be made up, the reducing gas with higher temperature can be obtained, and meanwhile, the reducing gas can be heated more uniformly.
The reducing gas temperature raising device provided by the embodiment of the application utilizes the combustion of partial reducing gas or the combustion of fuel gas to heat the reducing gas, has simple structure, low production cost and low burning-through probability, and can prolong the service life of the reducing gas temperature raising device.
It can be understood that the oxygen supply assembly and the air inlet 9 are arranged on the same side of the furnace body 1, so that oxygen can conveniently ignite part of the reducing gas as soon as possible, and the heating efficiency of the reducing gas can be improved.
As shown in fig. 1 and 2, in one possible embodiment, the oxygen supply assembly includes: an oxygen supply pipe 3; the oxygen enclosing pipe 4 is arranged on one side of the furnace body 1, the oxygen enclosing pipe 4 and the air inlet 9 are arranged on the same side of the furnace body 1, and the oxygen supply pipeline 3 is communicated with the oxygen enclosing pipe 4; the oxygen spray pipe 5, one end of the oxygen spray pipe 5 is communicated with the oxygen surrounding pipe 4, and the other end is communicated with the heating space 2; a first control valve 12, the first control valve 12 being arranged on the oxygen supply pipe 3; a first flowmeter 14, the first flowmeter 14 being provided on the oxygen supply pipe 3.
In this technical scheme, further provided the structure constitution of oxygen supply unit, the oxygen supply unit can include oxygen supply pipe 3, oxygen surrounding pipe 4, oxygen spray tube 5, first control valve 12 and first flowmeter 14, based on this, in the course of the work, oxygen can supply into oxygen surrounding pipe 4 through oxygen supply pipe 3, and in this course oxygen can carry out the turbulent flow, then oxygen is supplied into in the heating space 2 through the oxygen nozzle again, can make the supply of oxygen more even, and combustion heating effect is better. The start and stop of the oxygen supply are facilitated by the first control valve 12, and the metering of the oxygen supply is facilitated by the provision of the first flow meter 14.
As shown in fig. 1 and 2, in one possible embodiment, the oxygen nozzles 5 are plural, and the plural oxygen nozzles 5 are arranged at intervals.
In this technical scheme, oxygen spray tube 5 can be a plurality of, through a plurality of oxygen spray tube 5 interval arrangement, can make the oxygen more even, the dispersed supply to the heating space 2 in the space, can make the effect of burning heating more.
In one possible embodiment, the gas supply assembly comprises: a gas pipe 6; the gas enclosure pipe 7 is arranged on one side of the furnace body 1, the gas enclosure pipe 7 and the air inlet 9 are arranged on the same side of the furnace body 1, and the gas pipeline 6 is communicated with the gas enclosure pipe 7; the gas spray pipe 8, one end of the gas spray pipe 8 is communicated with the gas surrounding pipe 7, and the other end is communicated with the heating space 2; a second control valve 13, the second control valve 13 being arranged on the gas pipe 6; a second flowmeter 15, the second flowmeter 15 being arranged on the gas conduit 6; wherein, gas spray pipes 8 are a plurality of, and a plurality of gas spray pipes 8 interval arrangement.
In this technical scheme, further provided the structure constitution of gas supply unit, the gas supply unit can include gas pipeline 6, gas shroud pipe 7, gas spray tube 8, second control valve 13 and second flowmeter 15, based on this, in the course of the operation, the gas can be supplied into in the gas shroud pipe 7 through gas pipeline 6, in this course the gas can carry out the turbulent flow, then in the gas is supplied into heating space 2 through the gas nozzle again, can make the supply of gas more even, the combustion heating effect is better. The start and stop of the gas supply are facilitated by the second control valve 13, and the metering of the gas supply is facilitated by the provision of the second flowmeter 15.
In this technical scheme, a plurality of gas spray pipes 8 can be provided, through a plurality of gas spray pipes 8 interval arrangement, can make the gas more even, the dispersed supply to the heating space 2 in the space, can make the effect of burning heating more.
It is understood that the heating value of the gas outputted via the gas supply assembly may be higher than the heating value of the reducing gas to heat the reducing gas by combustion of the gas.
As shown in fig. 1 and 2, in one possible embodiment, the oxygen enclosure 4 is arranged in a ring shape, and the oxygen enclosure 4 is arranged concentrically with the inlet 9. This arrangement can make the oxygen supply more uniform.
In a possible embodiment, the gas enclosure 7 is arranged in a ring shape, and the gas enclosure 7 is arranged concentrically with the gas inlet 9. This arrangement can make the gas supply more uniform.
In some examples, the oxygen supply pipe 3 is symmetrically arranged along the center line of the inlet 9 of the high-temperature high-pressure reducing gas; further, the oxygen surrounding pipe 4 is connected with the oxygen supply pipeline 3 and is arranged concentrically with the high-temperature high-pressure reducing gas inlet 9; the oxygen spray pipes 5 are uniformly arranged at intervals along the circumference of the oxygen surrounding pipe 4, and are made of high-temperature resistant alloy; the oxygen injection pressure in the oxygen lance 5 is 0.1 MPa higher than the pressure of the high-temperature high-pressure reducing gas inlet 9.
In some examples, the gas pipes 6 are symmetrically arranged along the central line of the inlet 9 of the high-temperature high-pressure reducing gas, and are positioned above the oxygen supply pipe 3 in a height position; further, the gas enclosure pipe 7 is connected with the gas pipeline 6 and is arranged concentrically with the high-temperature high-pressure reducing gas inlet 9; the gas spray pipes 8 are uniformly arranged at intervals along the circumference of the gas enclosing pipe 7 and are made of high-temperature resistant alloy; the injection pressure of the internal combustion gas in the gas spray pipe 8 is 0.1 MPa higher than the pressure of the high-temperature high-pressure reducing gas inlet 9.
In one possible embodiment, the reducing gas temperature raising device further includes: a heat insulating layer 16, the heat insulating layer 16 being anchored to the outer wall of the furnace body 1; wherein, the inner wall of the furnace body 1 is built by refractory materials; wherein the air inlet 9 and the air outlet 10 are made of high temperature resistant alloy material.
In this technical scheme, reducing gas temperature-raising device can also include heat insulating layer 16, can make furnace body 1 possess better thermal insulation through the setting of heat insulating layer 16, forms by refractory material masonry through the inner wall of furnace body 1, and air inlet 9 and gas outlet 10 are made by high temperature resistant alloy material, can improve reducing gas temperature-raising device's life.
As shown in fig. 3, a second aspect of an embodiment of the present invention proposes a hydrogen-based smelting system including: the reducing gas temperature raising device according to any one of the above-described aspects; the heating furnace 21, the heating furnace 21 is used for carrying out preliminary heating on the reducing gas, the output end of the heating furnace 21 is communicated with the reducing gas temperature raising device, and the reducing gas temperature raising device is used for carrying out reheating on the reducing gas; the output end of the reducing gas temperature raising device is communicated with the hydrogen-based shaft furnace 22.
The hydrogen-based smelting system provided by the embodiment of the invention comprises the reducing gas temperature raising device in any one of the technical schemes, so that the hydrogen-based smelting system has all the beneficial effects of the reducing gas temperature raising device in the technical scheme.
The reducing gas temperature raising device of the hydrogen-based smelting system provided by the embodiment of the invention comprises a furnace body 1 and an oxygen supply assembly, and the inventor finds that the reason for the phenomenon is that the temperature of the hydrogen entering the hydrogen-based shaft furnace 22 is too low, and excessive hydrogen only can carry heat energy, so that the waste of hydrogen energy and the rise of smelting cost are caused, in consideration of the fact that the hydrogen consumption of the hydrogen-based smelting system in the prior art is far greater than the hydrogen consumption in the smelting reduction reaction in the working process. In the use process of the reducing gas temperature raising device provided by the embodiment of the invention, the reducing gas is heated by the heating furnace 21, then the air inlet 9 and the air outlet 10 are opened, and the reducing gas to be heated which is primarily heated by the heating furnace 21 is supplied into the heating space 2; oxygen is supplied into the heating space 2 through the oxygen supply means to heat the reducing gas to be heated by combustion of a part of the reducing gas; when the temperature of the reducing gas output through the gas outlet 10 is lower than the first threshold value, gas is supplied into the heating space 2 through the gas supply assembly to heat the reducing gas to be heated through combustion of the gas, and on the basis of the gas, the reducing gas with higher temperature can be output to the hydrogen-based shaft furnace 22 through the gas outlet 10, so that the reducing gas can carry more heat energy into the hydrogen-based shaft furnace 22, and the consumption of the reducing gas can be reduced while the smelting production is ensured. The reducing gas temperature raising device provided by the embodiment of the invention is combined with the heating furnace 21, so that the reducing gas can be subjected to two-stage heating, the arrangement of indirect heating of the heating furnace 21 can be made up, and the reducing gas with higher temperature can be obtained.
As shown in fig. 4, a third aspect of the embodiment of the present invention provides a reducing gas temperature raising method, which is applied to the reducing gas temperature raising device according to any one of the above-mentioned technical solutions, and the reducing gas temperature raising method includes:
step 301: opening the air inlet and the air outlet, and supplying reducing gas to be heated into the heating space;
step 302: oxygen is supplied into the heating space through the oxygen supply assembly so as to heat the reducing gas to be heated through combustion of part of the reducing gas;
Step 303: when the temperature of the reducing gas output through the gas outlet is lower than the first threshold value, gas is supplied into the heating space through the gas supply assembly to heat the reducing gas to be heated through combustion of the gas.
The reducing gas temperature raising method provided by the embodiment of the invention is applied to the reducing gas temperature raising method according to any one of the technical schemes, so that the reducing gas temperature raising method has all the beneficial effects of the reducing gas temperature raising device according to the technical scheme.
According to the reducing gas temperature raising method provided by the embodiment of the invention, the air inlet and the air outlet are opened by combining the reducing gas temperature raising device, and the reducing gas to be heated is supplied into the heating space; oxygen is supplied into the heating space through the oxygen supply assembly so as to heat the reducing gas to be heated through combustion of part of the reducing gas; when the temperature of the reducing gas output through the gas outlet is lower than a first threshold value, gas is supplied into the heating space through the gas supply assembly so as to heat the reducing gas to be heated through combustion of the gas, and on the basis, the reducing gas with higher temperature can be output to the hydrogen-based shaft furnace through the gas outlet, so that the reducing gas can carry more heat energy into the hydrogen-based shaft furnace, and the consumption of the reducing gas can be reduced while the smelting production is ensured. The reducing gas temperature raising device provided by the embodiment of the invention is combined with the heating furnace, so that the reducing gas can be subjected to two-stage heating, the arrangement of indirect heating of the heating furnace can be made up, and the reducing gas with higher temperature can be obtained.
According to the embodiment of the invention, the reducing gas used for smelting can be the mixed gas of hydrogen and other gases, so that the heat value of the reducing gas can be low, the effect of self combustion heating of the reducing gas is poor, the reducing gas can be heated by the combustion of the fuel gas in a fuel gas supply mode, and the heating effect of the reducing gas is further ensured.
It is understood that in the case where the reducing gas is hydrogen, the first threshold value may have a value of 900 ℃ to 1000 ℃.
In one possible embodiment, the oxygen supply assembly is controlled to be turned off when the supply temperature of the reducing gas to be heated via the gas inlet is lower than a second threshold value. The use of the reduction gas temperature raising device is safer by setting the temperature raising device in this way, and it is understood that the value of the second threshold value is larger than 700 ℃.
In a possible embodiment, the ratio of the supply volume of oxygen to the volume of hydrogen in the reducing gas to be heated is controlled to be less than or equal to 4%. The arrangement avoids the excessive reducing gas from being burnt, reduces the loss of the reducing gas and avoids the probability of explosion while guaranteeing the heating effect of the reducing gas.
In one possible embodiment, the supply pressure of the oxygen is controlled to be greater than the supply pressure of the reducing gas to be heated; the supply pressure of the control gas is greater than the supply pressure of the reducing gas to be heated. This arrangement facilitates the supply of oxygen or gas into the heating space.
In some examples, the pressure of the reducing gas may be 0.1 MPa, ensuring safe heating of the reducing gas.
In some examples, shut-off valves and check valves to prevent flashback are provided on the oxygen supply and gas lines to further ensure the safety of the reducing gas heating.
Examples
As shown in fig. 1 and 2, the reducing gas temperature raising device comprises a furnace body 1, an oxygen supply pipeline 3, an oxygen enclosing pipe 4, an oxygen spray pipe 5, a gas pipeline 6, a gas enclosing pipe 7, a gas spray pipe 8 and a control system 11; wherein, a heating space 2 is arranged in the furnace body 1, and a high-temperature high-pressure reducing gas inlet 9 and a high-temperature high-pressure reducing gas outlet 10 are respectively arranged at two ends of the furnace body; the oxygen supply pipelines 3 are uniformly and symmetrically arranged on the furnace body 1 at the same side of the gas inlet 9 and extend into the furnace body 1 to be connected with the oxygen surrounding pipe 4; the oxygen surrounding pipe 4 is arranged in the furnace body 1 at the same side of the high-temperature high-pressure reducing gas inlet 9 and is connected with the oxygen supply pipeline 3; the oxygen spray pipes 5 are uniformly arranged on the oxygen surrounding pipe 4, and the other ends of the oxygen spray pipes are communicated with the inner wall of the heating space 2 of the furnace body 1; the gas pipeline 6 is arranged above the oxygen supply pipeline 3 in the same way, the gas surrounding pipe 7 is connected to the gas pipeline 6 and is arranged in the furnace body 1, the gas spraying pipes 8 are uniformly arranged on the gas surrounding pipe 7, and the other end of the gas spraying pipes is communicated with the inner wall of the heating space 2 of the furnace body 1; the control system 11 is used for controlling the introduction and the cutting-off of the high-temperature high-pressure reducing gas, the oxygen and the fuel gas, and realizing the reasonable control of the injection quantity of the oxygen and the fuel gas and the intelligent control of the system safety.
As shown in fig. 1, a furnace body 1 is provided with an air inlet 9 of high-temperature high-pressure reducing gas and an air outlet 10 of the high-temperature high-pressure reducing gas, wherein the high-temperature high-pressure reducing gas inlet and outlet respectively penetrate out of the furnace body 1, and the high-temperature high-pressure reducing gas temperature extraction is completed in a heating space 2.
Further, a heat insulation layer 16 structure is arranged in the furnace body 1, and a heat insulation material and a refractory material are used for the heat insulation layer 16 structure. The refractory material is made of zirconium-aluminum fiber material, and the thickness of the zirconium-aluminum fiber material is 350-400mm. The zirconium aluminum fiber material can be used for a long time in a high-temperature hearth environment at 1350 ℃, and is installed on the periphery of a steel plate outside the furnace body in a metal anchoring piece mode, so that the insulation material can be prevented from falling off, separating from seams and penetrating heat in the long-term low-temperature high-temperature repeated heating and cooling use process, and the insulation effect of long-term use can be achieved. The support frame outside the furnace body is of a steel structure. In this embodiment, the structure of the support frame outside the furnace body is not limited, and the material of the heat-insulating and refractory material in the furnace is not limited.
Oxygen provided by the outside is conveyed into the oxygen surrounding pipe 4 by the oxygen supply pipe 3, and then is sprayed into the heating space 2 by the oxygen spray pipe.
Furthermore, the oxygen supply pipeline 3 is uniformly and symmetrically arranged on the furnace body on the same side of the gas inlet 9, and extends into the furnace body 1 to be connected with the oxygen surrounding pipe 4. The oxygen enclosing pipe 4 is arranged in the furnace body at the same side of the high-temperature high-pressure reducing gas inlet, oxygen flows into the oxygen enclosing pipe 4 from the oxygen supply pipeline 3, and is sprayed into the heating space 2 through the oxygen spray pipe 5 arranged in the oxygen enclosing pipe 4. One end of the oxygen spray pipe 5 is connected with the oxygen surrounding pipe 4, and the other end is communicated into the heating space 2.
In a specific application, high pressure reducing gas at a temperature of about 900 ℃ is introduced into the heating space 2 through the reducing gas inlet. The proper oxygen blowing amount can be calculated according to the temperature and flow rate of the high-temperature high-pressure reducing gas and the proper gas flow rate, oxygen is introduced into the oxygen supply pipeline 3, after the oxygen has uniform flow rate and pressure in the surrounding pipe 4, the oxygen is sprayed into the heating space 2 through a plurality of uniformly arranged oxygen spray pipes 5, the high-temperature high-pressure reducing gas is partially combusted, and the heating space begins to be heated. The heat released by combustion is absorbed by the reducing gas, the temperature of the reducing gas is further increased to 1000-1050 ℃, and the heated reducing gas is uniformly distributed at the rear end of the heating space 2. Finally, the hydrogen is conveyed to a downstream hydrogen-based shaft furnace process for use through a high-temperature high-pressure reducing gas outlet.
By the control of the first control valve 12 on the oxygen supply pipeline 3, oxygen with proper volume is sprayed into the heating space, the high-temperature high-pressure reducing gas is partially combusted, and the temperature is raised to 1000-1050 ℃. In the process, the inlet temperature of the high-temperature high-pressure reducing gas needs to be higher than 700 ℃, otherwise, the oxygen supply pipeline 3 is in a normally closed state. When oxygen blowing and temperature raising operation is performed, the oxygen flow rate should be less than 4% of the volume of hydrogen in the reducing gas, and the oxygen pressure is higher than the inlet pressure of the high-temperature high-pressure reducing gas by 0.1 MPa.
The temperature of each part is detected in real time, and the control system 11 can reasonably adjust and control the oxygen injection flow rate by combining the feedback results of the sensors, such as the detection results of the first flowmeter 14 and the second flowmeter 15, so as to adjust the gas temperature; at the same time, the calculation result can be displayed by means of the screen of the system control management device.
Finished product reducing gas with the temperature rising and uniform temperature in the heating space 2 is discharged out of the furnace through the high-temperature high-pressure reducing gas outlet 10 and is conveyed to the hydrogen-based shaft furnace 22 for use.
Further, if the heat value of the high-temperature high-pressure reducing gas is low, the heat generated by oxygen blowing combustion cannot enable the outlet temperature of the high-temperature high-pressure reducing gas to reach the temperature raising target temperature, at this time, the control system 11 can automatically open the second control valve 13 on the gas pipeline, automatically adjust the oxygen and the gas blowing flow according to the outlet temperature of the high-temperature high-pressure reducing gas, finally enable the outlet temperature of the high-temperature high-pressure reducing gas to reach the temperature raising target temperature, and enable the high-temperature high-pressure reducing gas with qualified temperature to be discharged out of the furnace through the gas outlet 10 and be conveyed to the hydrogen-based shaft furnace for use; when the device is in fault and the furnace is shut down, the valves on the oxygen supply pipeline 3 and the gas pipeline 6 are immediately closed, and the oxygen and the gas are stopped from being blown into the furnace.
In summary, through the reducing gas temperature raising device and the reducing gas temperature raising method provided by the embodiment of the invention, in use, the treatable reducing gas has wider component range, low energy consumption, high heat efficiency and high safety coefficient, and can stably convey the reducing gas with proper temperature for the hydrogen-based shaft furnace for a long time.
The oxygen blowing amount can be reasonably controlled, so that the temperature of the high-temperature high-pressure reducing gas can be safely and efficiently improved on the premise of not greatly influencing the components of the reducing gas and guaranteeing the safety.
The furnace body 1 is provided with the heat insulation layer 16 to form an effective heating space, so that the device is prevented from being locally overheated to generate deflagration, and the further heated high-temperature high-pressure reducing gas can be uniformly distributed in composition and temperature at the rear end of the heating space.
The device is provided with a supplementary fuel gas inlet, and oxygen and supplementary fuel (fuel gas or other high-heat-value fuel gas) can be simultaneously introduced into the temperature raising device under the condition that the heat value of the reducing gas is low and the temperature of the reducing gas still cannot reach the temperature raising target even though oxygen is blown, so that the temperature of the reducing gas reaches the process requirement of the downstream hydrogen-based shaft furnace.
The invention provides a high-temperature high-pressure reduction gas stripping process, which is short in flow, high in efficiency and low in energy consumption. The range of the treatable reducing gas component is wide, and the temperature of the reducing gas is stable.
In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is used merely for convenience in describing the invention and for simplicity of description, and does not indicate or imply that the devices or units referred to must have a particular orientation, be constructed and operated in a particular direction, and thus should not be construed as limiting the invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A hydrogen-based smelting system, comprising:
A reducing gas temperature raising device;
the heating furnace is used for primarily heating the reducing gas, the output end of the heating furnace is communicated with the reducing gas temperature-raising device, and the reducing gas temperature-raising device is used for reheating the reducing gas;
the output end of the reducing gas temperature raising device is communicated with the hydrogen-based shaft furnace;
wherein, reducing gas temperature raising device includes:
the heating device comprises a furnace body, wherein a heating space is formed in the furnace body, and an air inlet and an air outlet are respectively arranged at two ends of the furnace body;
An oxygen supply assembly, the oxygen supply assembly comprising:
An oxygen supply pipe;
the oxygen surrounding pipe is arranged on one side of the furnace body, the oxygen surrounding pipe and the air inlet are arranged on the same side of the furnace body, and the oxygen supply pipeline is communicated with the oxygen surrounding pipe;
one end of the oxygen spray pipe is communicated with the oxygen surrounding pipe, and the other end of the oxygen spray pipe is communicated with the heating space;
The first control valve is arranged on the oxygen supply pipeline;
a first flowmeter disposed on the oxygen supply pipe;
A gas supply assembly, the gas supply assembly comprising:
a gas pipeline;
The gas surrounding pipe is arranged on one side of the furnace body, the gas surrounding pipe and the air inlet are arranged on the same side of the furnace body, and the gas pipeline is communicated with the gas surrounding pipe;
one end of the gas spray pipe is communicated with the gas surrounding pipe, and the other end of the gas spray pipe is communicated with the heating space;
The second control valve is arranged on the gas pipeline;
a second flowmeter disposed on the gas conduit;
The reducing gas temperature raising method of the hydrogen-based smelting system comprises the following steps:
Opening the air inlet and the air outlet, and supplying reducing gas to be heated into the heating space;
supplying oxygen into the heating space through the oxygen supply assembly so as to heat the reducing gas to be heated through combustion of part of the reducing gas;
when the temperature of the reducing gas output through the gas outlet is lower than a first threshold value, supplying gas into the heating space through the gas supply assembly so as to heat the reducing gas to be heated through combustion of the gas;
And when the supply temperature of the reducing gas to be heated through the air inlet is lower than a second threshold value, controlling the oxygen supply assembly to be closed.
2. A hydrogen-based smelting system according to claim 1, wherein,
The oxygen spray pipes are multiple and are arranged at intervals.
3. A hydrogen-based smelting system according to claim 1, wherein,
The gas spray pipes are arranged at intervals.
4. A hydrogen-based smelting system according to claim 1, wherein,
The oxygen surrounding pipe is annularly arranged, and the oxygen surrounding pipe and the air inlet are concentrically arranged;
the gas enclosure pipe is annularly arranged, and the gas enclosure pipe and the air inlet are concentrically arranged.
5. The hydrogen-based smelting system of claim 1, further comprising:
the heat insulation layer is anchored on the outer wall of the furnace body;
wherein the inner wall of the furnace body is formed by building refractory materials;
wherein the air inlet and the air outlet are made of high-temperature resistant alloy materials.
6. The hydrogen-based smelting system of claim 1, wherein the reducing gas temperature raising method further comprises:
Controlling the ratio of the supply volume of oxygen to the volume of hydrogen in the reducing gas to be heated to be less than or equal to 4%;
Controlling the supply pressure of the oxygen to be larger than the supply pressure of the reducing gas to be heated;
And controlling the supply pressure of the fuel gas to be larger than the supply pressure of the reducing gas to be heated.
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| CN202410324423.2A CN117925934B (en) | 2024-03-21 | Reducing gas temperature raising device, hydrogen-based smelting system and reducing gas temperature raising method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410324423.2A CN117925934B (en) | 2024-03-21 | Reducing gas temperature raising device, hydrogen-based smelting system and reducing gas temperature raising method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093473A (en) * | 2012-02-13 | 2014-10-08 | 西门子Vai金属科技有限责任公司 | Method and device for reducing iron oxide-containing feedstocks |
| CN107385134A (en) * | 2017-08-31 | 2017-11-24 | 江苏省冶金设计院有限公司 | Heating system and method for the also Primordial Qi of gas-based shaft kiln directly reduced system |
| CN117305530A (en) * | 2023-09-21 | 2023-12-29 | 北京清航空天动力科技有限公司 | Hydrogen metallurgy reduced iron device and method |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093473A (en) * | 2012-02-13 | 2014-10-08 | 西门子Vai金属科技有限责任公司 | Method and device for reducing iron oxide-containing feedstocks |
| CN107385134A (en) * | 2017-08-31 | 2017-11-24 | 江苏省冶金设计院有限公司 | Heating system and method for the also Primordial Qi of gas-based shaft kiln directly reduced system |
| CN117305530A (en) * | 2023-09-21 | 2023-12-29 | 北京清航空天动力科技有限公司 | Hydrogen metallurgy reduced iron device and method |
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