A blast furnace ironmaking plant and a blast furnace ironmaking process

Abstract

The present application belongs to the technical field of metallurgy-iron smelting, and discloses a blast furnace iron smelting equipment and a blast furnace iron smelting process capable of realizing low-carbon smelting and recycling of carbon. The blast furnace iron smelting equipment comprises a blast furnace body, a dust removal system, a heating and pressurizing system, a waste heat utilization and cooling system, and a carbon dioxide separation and treatment system. The flue gas flowing out of the gas outlet of the blast furnace body is dusted by the dust removal system, and then a part of the flue gas is cooled by the waste heat utilization and cooling system and then enters the carbon dioxide separation and treatment system, so as to separate the coal gas and carbon dioxide in the cooled flue gas, and make the separated coal gas enter the heating and pressurizing system, and the separated carbon dioxide is heated by the waste heat utilization and cooling system and then enters the heating and pressurizing system. Another part of the flue gas after being dusted by the dust removal system is used for the operation of the heating and pressurizing system, so as to heat and pressurize the carbon dioxide and coal gas entering the heating and pressurizing system and then send them into the inside of the blast furnace body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy-iron smelting, in particular to a blast furnace iron smelting device and a blast furnace iron smelting process. BACKGROUND

[0002] In the traditional iron smelting process, the main raw fuel includes coke and coal powder, and the gas medium entering the blast furnace is mainly hot air (or enriched oxygen), and the fuel ratio is generally high, and the traditional iron smelting is facing increasing pressure. How to realize low-carbon smelting and recycling of carbon is a problem that needs to be solved in the field. SUMMARY

[0003] In order to realize low-carbon smelting and recycling of carbon, the present application provides a blast furnace iron smelting device and a blast furnace iron smelting process.

[0004] The blast furnace iron smelting device according to the present application comprises: a blast furnace body, a dust removal system in communication with a gas outlet of the blast furnace body, a heating and pressurizing system and a waste heat utilization and cooling system in communication with the dust removal system respectively, and a carbon dioxide separation and treatment system in communication with the waste heat utilization and cooling system, wherein the heating and pressurizing system is in communication with the inside of the blast furnace body, wherein a part of flue gas flowing out of the gas outlet is cooled by the dust removal system, and then enters the carbon dioxide separation and treatment system after being cooled by the waste heat utilization and cooling system, so as to separate the coal gas and carbon dioxide in the cooled flue gas, and make the separated coal gas enter the heating and pressurizing system, and the separated carbon dioxide enters the heating and pressurizing system after being heated by the waste heat utilization and cooling system; another part of the flue gas cooled by the dust removal system is used for the operation of the heating and pressurizing system, so as to heat and pressurize the carbon dioxide and coal gas entering the heating and pressurizing system and send them into the inside of the blast furnace body.

[0005] Further, the blast furnace iron smelting device further comprises an electric heating system in communication with the inside of the blast furnace body, which is used for electric heating of the material at the hearth part of the blast furnace body, and for providing heat energy to the heating and pressurizing system.

[0006] Further, the blast furnace iron smelting device further comprises a carbon dioxide treatment system in communication with the carbon dioxide separation and treatment system, which is used for collecting, storing, or chemically or physically treating the separated carbon dioxide from the carbon dioxide separation and treatment system.

[0007] Further, the carbon dioxide separation and treatment system is in communication with the heating and pressurizing system, so that the cooled flue gas that fails to be treated and enters the carbon dioxide separation and treatment system from the waste heat utilization and cooling system can be used for the operation of the heating and pressurizing system.

[0008] Further, the heating and pressurizing system is connected with the waste heat utilization and cooling system, so that the flue gas generated by the heating and pressurizing system enters the waste heat utilization and cooling system for waste heat utilization.

[0009] Further, the blast furnace ironmaking equipment further comprises a power supply system connected with the electric heating system and the heating and pressurizing system respectively.

[0010] Further, the blast furnace body comprises a hot blast surrounding pipe connected with the inside of the blast furnace body, the heating and pressurizing system is connected with the hot blast surrounding pipe, and the blast furnace ironmaking equipment further comprises another medium supply system connected with the hot blast surrounding pipe for adjusting the process production.

[0011] According to the blast furnace ironmaking process of the present application, the process comprises the following steps: dust removal treatment is performed on the flue gas discharged from the blast furnace body; a part of the dust-removed flue gas is used for heating and pressurizing of the coal gas and the carbon dioxide after waste heat utilization; the separated carbon dioxide is heated and introduced into the inside of the blast furnace body together with the separated coal gas after heating and pressurizing; and another part of the dust-removed flue gas is used for heating and pressurizing of the coal gas and the carbon dioxide.

[0012] Further, the process further comprises the following step: electric heating is performed on the material in the hearth part of the blast furnace body.

[0013] Further, the process further comprises the following step: the flue gas generated in the process of heating and pressurizing the coal gas and the carbon dioxide together is separated into the coal gas and the carbon dioxide after waste heat utilization.

[0014] Further, the process further comprises the following step: the flue gas after waste heat utilization and unable to be used for separation of the coal gas and the carbon dioxide is used for heating and pressurizing of the coal gas and the carbon dioxide.

[0015] Compared with the prior art, the blast furnace ironmaking equipment of the present application has the following advantages:

[0016] (1) By introducing the waste heat utilization and cooling system, the coal gas generated by the blast furnace body and the flue gas waste heat generated by the heating and pressurizing system can be fully utilized, so as to improve the energy utilization rate and directly or indirectly reduce the carbon emission;

[0017] (2) By introducing the carbon dioxide separation and treatment system, not only the flue gas from the blast furnace body can be treated, so that the coal gas with high purity can be obtained to improve the utilization efficiency of the coal gas, and the separated carbon dioxide gas can be recycled, part of which can be stored and treated, thereby reducing the carbon emission; but also the flue gas generated in the working process of the heating and pressurizing system can be treated, thereby further reducing the carbon emission;

[0018] (3) By introducing a heating and pressurizing system, the utilization rate of the gas produced by the entire production process can be improved, thereby improving the resource utilization rate.

[0019] (4) By introducing an electric heating system, energy can be provided for the electric heating of the blast furnace to reduce carbon consumption. At the same time, the electric heating system can also function as a heating and pressurizing system to ensure the gas utilization rate and electrical conversion rate of the entire system, thereby achieving optimal resource allocation.

[0020] (5) By introducing other media supply systems, the process production can be adjusted to ensure the smooth operation of the entire process production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a blast furnace ironmaking equipment according to an embodiment of the present invention. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0023] Figure 1 The structure of a blast furnace ironmaking apparatus 100 according to an embodiment of the present invention is shown. Figure 1 As shown, the blast furnace ironmaking equipment 100 may include: a blast furnace body 111, a dust removal system 1 connected to the gas outlet 113 of the blast furnace body 111, a heating and pressurizing system 6 and a waste heat utilization and cooling system 2 connected to the dust removal system 1, and a carbon dioxide separation and treatment system 3 connected to the waste heat utilization and cooling system 2. The heating and pressurizing system 6 is connected to the interior of the blast furnace body 111. The flue gas S flowing out of the outlet is dedusted by the dust removal system 1. A portion of the flue gas S1 is cooled by the waste heat utilization and cooling system 2 and then enters the carbon dioxide separation and treatment system 3 to separate the coal gas and carbon dioxide in the cooled flue gas. The separated coal gas enters the coal gas pipeline network 5 and then enters the heating and pressurization system 6 through the ninth pipeline 109. The separated carbon dioxide enters the waste heat utilization and cooling system 2 through the seventh pipeline 107 for preheating and then enters the heating and pressurization system 6 through the third pipeline 103. The other portion of the flue gas S2, which is dedusted by the dust removal system 1, is used by the heating and pressurization system 6 to heat and pressurize the aforementioned carbon dioxide and coal gas entering the heating and pressurization system 6 before being sent into the interior of the blast furnace body 111.

[0024] The blast furnace iron-making equipment 100 in the embodiment of the present application works, the flue gas S flowing out of the gas outlet is dedusted by the dedusting system 1, a part of the flue gas S2 is used for heating the carbon dioxide gas and the high-purity coal gas, and a part enters the waste heat utilization and cooling system 2, which is used for cooling the flue gas entering the waste heat utilization and cooling system 2 to meet the separation requirement of the subsequent carbon dioxide separation and treatment system 3, and is also used for preheating the carbon dioxide separated by the carbon dioxide separation and treatment system 3; in the carbon dioxide separation and treatment system 3, the carbon dioxide gas and the high-purity coal gas can be separated and obtained, the high-purity coal gas can be merged into the coal gas pipe network 5, and the carbon dioxide gas enters the heating and pressurizing system 6 after being preheated in the waste heat utilization and cooling system 2; after the preheated carbon dioxide gas and the high-purity coal gas from the ninth pipeline 109 enter the heating and pressurizing system 6 and are heated and pressurized, they are sent into the interior of the blast furnace body 1 along the fifth pipeline 105 and the sixth pipeline 106, respectively.

[0025] The blast furnace iron-making equipment 100 in the embodiment of the present application can fully utilize the flue gas waste heat generated by the blast furnace body 111 by introducing the waste heat utilization and cooling system 2, the heat can be used for preheating the carbon dioxide separated by the carbon dioxide separation and treatment system 3, thereby the energy utilization rate can be improved; by introducing the carbon dioxide separation and treatment system 3, the flue gas from the blast furnace body 111 can be treated, thereby the high-purity coal gas can be obtained to improve the utilization efficiency of the coal gas, and the separated carbon dioxide gas can also be recycled, that is, the carbon dioxide is preheated by the waste heat utilization and cooling system 2 and then enters the blast furnace body 1 again by the heating and pressurizing system 6, thereby the carbon emission can be reduced; by introducing the heating and pressurizing system 6, the utilization rate of the flue gas produced by the blast furnace body 111 in the whole production process can be improved, thereby the resource utilization rate can be improved. Thus, the blast furnace iron-making equipment 100 in the embodiment of the present application not only realizes low-carbon smelting but also realizes better carbon recycling.

[0026] In the preferred embodiment as shown in Figure 1 In the preferred embodiment as shown in

[0027] According to the present application, as shown in Figure 1As shown, the blast furnace ironmaking equipment 100 can further comprise an electric heating system 7 in communication with the interior of the blast furnace body 111, which is used for electric heating of the material in the hearth part of the blast furnace body 111, and can also be used for providing heat energy to the heating and pressurizing system 6. The electric heating system 7 can provide energy for the electric heating of the interior of the blast furnace body 111 to reduce the amount of carbon used, and the electric heating system 7 can also provide energy for the heating and pressurizing system 6 to ensure the utilization rate of coal gas and the electric conversion rate of the entire system, so as to achieve optimal resource allocation. In this embodiment, electric energy is used to replace part of the carbon amount, which can further achieve low-carbon smelting and full recycling of carbon.

[0028] According to the present application, in the preferred embodiment as shown, Figure 1 As shown in the preferred embodiment, the blast furnace ironmaking equipment 100 can further comprise a carbon dioxide treatment system 4 in communication with the carbon dioxide separation and treatment system 3, which can be used to collect, store, or chemically or physically treat the carbon dioxide separated by the carbon dioxide separation and treatment system 3. In this embodiment, most of the carbon dioxide separated by the carbon dioxide separation and treatment system 3 is used to enter the waste heat utilization and cooling system 2 for preheating, and the excess part can be treated by the carbon dioxide treatment system 4.

[0029] Further, as shown in the preferred embodiment, Figure 1 As shown, the carbon dioxide separation and treatment system 3 is in communication with the heating and pressurizing system 6, so that the flue gas that is not treated by the carbon dioxide separation and treatment system 3 can be used to work for the heating and pressurizing system 6. In this embodiment, considering that there can be flue gas that is not treated in the carbon dioxide separation and treatment system 3, this part of flue gas is introduced into the heating and pressurizing system 6 through the fourth pipeline 104 to work for the heating and pressurizing system 6, so that the recycling of carbon can be further achieved.

[0030] Further, as shown in the preferred embodiment, Figure 1 As shown, the heating and pressurizing system 6 and the waste heat utilization and cooling system 2 can be in communication through the second pipeline 102, so that the flue gas generated by the heating and pressurizing system 6 can enter the waste heat utilization and cooling system 2 for waste heat utilization. The flue gas generated by the heating and pressurizing system 6 can be used for preheating of the carbon dioxide gas again, so that the full recycling of carbon can be further achieved.

[0031] Preferably, as shown in the preferred embodiment, Figure 1 As shown, most of the flue gas entering the waste heat utilization and cooling system 2 is used to enter the carbon dioxide separation and treatment system 3, and the excess part can be directly discharged into the atmospheric environment if it meets the emission standard, or can enter the carbon dioxide separation and treatment system 3 through the eighth pipeline 108 for separation of coal gas and carbon dioxide if it does not meet the emission standard.

[0032] According to the present application, as shown in the preferred embodiment,Figure 1 As shown, the blast furnace iron-making device 100 can further comprise a power supply system 9 connected with the electric heating system 7 and the heating and pressurizing system 6 respectively to simultaneously supply power to the electric heating system 7 and the heating and pressurizing system 6. Preferably, the power supply system 9 can be further connected with other user points 10 to simultaneously supply power to the other user points 10.

[0033] According to the present application, in the blast furnace iron-making device 100 as shown, Figure 1 In the preferred embodiment as shown, the blast furnace body 111 can further comprise a hot blast surrounding pipe 112 connected with the interior of the blast furnace body 111, the heating and pressurizing system 6 is connected with the hot blast surrounding pipe 112, and the blast furnace iron-making device 100 can further comprise other medium supply system 8 connected with the hot blast surrounding pipe 112 for adjusting the process production. The other medium supply system 8 is used to input relevant other medium (such as oxygen or natural gas, etc.) to adjust the smelting furnace condition in the blast furnace body 111 to ensure the smooth progress of the blast furnace smelting process.

[0034] The present application further provides a blast furnace iron-making process, comprising the following process flow: dust removal treatment is performed on the flue gas discharged from the blast furnace body 111; a part of the dust-removed flue gas is used for waste heat utilization and then separated into coal gas and carbon dioxide, the separated carbon dioxide is heated and then introduced into the interior of the blast furnace body together with the separated coal gas after being heated and pressurized, and another part of the dust-removed flue gas is used for heating and pressurizing the coal gas and carbon dioxide to provide energy.

[0035] The blast furnace iron-making process of the present application can separate the coal gas and carbon dioxide from a part of the flue gas discharged from the blast furnace body 111 after preheating, obtain carbon dioxide and high-purity coal gas, and then preheat the carbon dioxide and heat and pressurize the high-purity coal gas to be introduced into the interior of the blast furnace body 111 together, which not only can fully utilize the heat energy in the flue gas, but also can make the separated carbon dioxide re-circulate into the interior of the blast furnace body 111 to assist the carbon combustion, and the carbon dioxide can further react with the carbon in the blast furnace body 111 to generate carbon monoxide, so that the separated carbon dioxide is more fully utilized. Since the carbon dioxide is always circulated in the entire blast furnace iron-making process, low-carbon production and full recycling of carbon are achieved. Meanwhile, the blast furnace iron-making process of the present application can fully utilize the flue gas produced by the blast furnace body 111 by using another part of the flue gas to heat and pressurize the coal gas and carbon dioxide to provide energy, so that the resource utilization rate is improved.

[0036] Further, the blast furnace iron-making process of the present application can further comprise the following process flow: electric heating is performed on the material in the hearth part of the blast furnace body 111. The electric heating can supplement the heat of the entire process system to achieve the purpose of carbon saving.

[0037] Further, the blast furnace iron-making process of the embodiment of the present application can further include a process flow of re-separating the heated and pressurized gas and carbon dioxide after waste heat utilization of the flue gas generated in the process of heating and pressurizing the gas and carbon dioxide together. The process flow can utilize the waste heat of the flue gas generated in the process of heating and pressurizing the gas and carbon dioxide together, and can be used for preheating of the carbon dioxide gas again, so that the full recycling of carbon can be further achieved.

[0038] Further, the blast furnace iron-making process of the embodiment of the present application can further include a process flow of re-separating the heated and pressurized gas and carbon dioxide after waste heat utilization of the flue gas generated in the process of heating and pressurizing the gas and carbon dioxide together. The process flow can utilize the waste heat of the flue gas generated in the process of heating and pressurizing the gas and carbon dioxide together, and can be used for preheating of the carbon dioxide gas again, so that the full recycling of carbon can be further achieved.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blast furnace ironmaking plant, characterized by, The blast furnace iron-making equipment comprises a blast furnace body, a dust removal system communicated with a gas outlet of the blast furnace body, a heating and pressurizing system and a waste heat utilization and cooling system communicated with the dust removal system respectively, and a carbon dioxide separation and treatment system communicated with the waste heat utilization and cooling system, wherein the heating and pressurizing system is communicated with the inside of the blast furnace body, the flue gas discharged from the gas outlet is dusted by the dust removal system, a part of the flue gas after dust removal is cooled by the waste heat utilization and cooling system and then enters the carbon dioxide separation and treatment system to separate the coal gas and the carbon dioxide in the cooled flue gas, the separated coal gas enters the heating and pressurizing system, and the separated carbon dioxide is heated by the waste heat utilization and cooling system and then enters the heating and pressurizing system; another part of the flue gas after dust removal is used for the working of the heating and pressurizing system to heat and pressurize the carbon dioxide and the coal gas in the heating and pressurizing system and then send them into the inside of the blast furnace body; the blast furnace iron-making equipment further comprises an electric heating system communicated with the inside of the blast furnace body, which is used for electrically heating the material at the hearth part of the blast furnace body and providing heat energy for the heating and pressurizing system. The blast furnace iron-making equipment further comprises a carbon dioxide treatment system communicated with the carbon dioxide separation and treatment system, which is used for collecting, storing, chemically treating or physically treating the separated carbon dioxide.

2. The blast furnace iron-making plant according to claim 1, characterized in that, The carbon dioxide separation and treatment system is communicated with the heating and pressurizing system to enable the flue gas after cooling and failing to be treated in the carbon dioxide separation and treatment system to work for the heating and pressurizing system.

3. The blast furnace iron-making plant according to claim 1, characterized in that, The heating and pressurizing system is communicated with the waste heat utilization and cooling system to enable the flue gas generated by the working of the heating and pressurizing system to utilize the waste heat.

4. The blast furnace iron-making plant according to claim 1, characterized in that, The blast furnace iron-making equipment further comprises a power supply system communicated with the electric heating system and the heating and pressurizing system respectively.

5. The blast furnace iron-making plant according to claim 1, characterized in that, The blast furnace body comprises a hot blast surrounding pipe communicated with the inside of the blast furnace body, the heating and pressurizing system is communicated with the hot blast surrounding pipe, and the blast furnace iron-making equipment further comprises other medium supply systems communicated with the hot blast surrounding pipe for adjusting the process production.

6. The blast furnace iron-making plant according to claim 1, characterized in that, The process flow comprises the following steps:

7. A blast furnace ironmaking process applying the blast furnace ironmaking plant according to any one of claims 1 to 6, characterized in that, Dusting the flue gas discharged from the blast furnace body; Separating the coal gas and the carbon dioxide after the waste heat utilization of a part of the flue gas after dusting, heating the separated carbon dioxide, heating and pressurizing the separated carbon dioxide and the coal gas together and then introducing them into the inside of the blast furnace body, and using another part of the flue gas after dusting to heat and pressurize the coal gas and the carbon dioxide, The blast furnace iron-making process further comprises the following process flow: electrically heating the material at the hearth part of the blast furnace body. The process flow further comprises the following steps: utilizing the flue gas generated in the process of heating and pressurizing the coal gas and the carbon dioxide together for waste heat utilization and then separating the coal gas and the carbon dioxide again.

8. The blast furnace ironmaking process according to claim 7, characterized in that, ​ 9. The blast furnace ironmaking process according to claim 7, characterized in that, Also included is a process flow in which flue gas that has failed to be used to separate the coal gas and the carbon dioxide after waste heat utilization is used as energy supply when the coal gas and the carbon dioxide are heated and pressurized.

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