Blast furnace gas decarbonization device

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and relates to a blast furnace gas decarburization device which comprises a tower body, a decarburization assembly, a decarburization solution regeneration assembly, a combustion assembly, a first blast furnace gas input assembly, a second blast furnace gas input assembly, a decarburization solution conveying assembly and a regenerated decarburization solution conveying assembly. The blast furnace gas decarbonization device can reduce the carbon dioxide emission level in a blast furnace ironmaking system, meanwhile, the blast furnace gas heat value is increased, the gas utilization additional value is increased, and the blast furnace gas utilization channel is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace ironmaking, and in particular to a blast furnace gas decarbonization device. Background Art

[0002] Blast furnace ironmaking is the process with the highest carbon emissions in the long process of steel production, so how to reduce carbon emissions in the blast furnace ironmaking process becomes the key.

[0003] Blast furnace gas is a by-product gas of blast furnace ironmaking. About 1200-1600m3 of blast furnace gas is produced for every ton of iron. Its main components are: 22%-26% carbon monoxide, 1%-5% hydrogen, 45%-55% nitrogen and 20-25% carbon dioxide. About 600kg of carbon dioxide is produced for every ton of iron. If carbon dioxide is captured, the carbon emission level of the blast furnace ironmaking process and even the entire long-process steel production process can be greatly reduced. Preliminary estimates show that carbon emissions can be reduced by more than 20%.

[0004] At present, the chemical absorption method for decarbonization of coal gas mostly uses absorption towers, desorption towers and corresponding auxiliary facilities. However, there are problems such as scattered equipment distribution, numerous and complex pipelines, relatively high energy consumption of system operation, and desorption heating mostly relying on external steam or electricity consumption. Summary of the Invention

[0005] In view of this, the present invention provides a blast furnace gas decarbonization device.

[0006] Specifically, the present invention is achieved through the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a blast furnace gas decarbonization device, comprising:

[0008] Tower body, used for installing various parts;

[0009] A decarbonization component is used for decarbonization; the decarbonization component is arranged at the upper part of the inner space of the tower body;

[0010] A decarbonization solution regeneration component is used to regenerate the decarbonization solution; the decarbonization solution regeneration component is arranged in the lower part of the internal space of the tower body;

[0011] A combustion assembly for burning blast furnace gas; the combustion assembly is arranged in the lower part of the internal space of the tower body, and is located below the decarbonization solution regeneration assembly and is connected to the decarbonization solution regeneration assembly;

[0012] a first blast furnace gas input component, for inputting blast furnace gas into the decarbonization component; the first blast furnace gas input component is connected to the decarbonization component;

[0013] a second blast furnace gas input assembly, for inputting blast furnace gas into the combustion assembly; the second blast furnace gas input assembly is connected to the combustion assembly;

[0014] A decarbonization solution delivery assembly is used to deliver the decarbonization solution; the decarbonization solution delivery assembly is connected to the lower portion of the decarbonization assembly and the upper portion of the decarbonization solution regeneration assembly respectively;

[0015] The regeneration decarbonization solution delivery component is used to deliver the regeneration decarbonization solution; the regeneration decarbonization solution delivery component is respectively connected to the lower part of the decarbonization solution regeneration component and the upper part of the decarbonization component.

[0016] Optionally, the decarbonization component includes: a lower decarbonization filler layer, an interstage cooler and an upper decarbonization filler layer, wherein the lower decarbonization filler layer, the interstage cooler and the upper decarbonization filler layer are connected in sequence and arranged from bottom to top in the upper part of the internal space of the tower body, the lower decarbonization filler layer is respectively connected to the decarbonization solution conveying component and the first blast furnace gas input component, and the regenerated decarbonization solution conveying component is connected to the upper decarbonization filler layer.

[0017] Optionally, the decarbonization component further includes: an absorption cooler, which is arranged in the upper part of the internal space of the tower body, above the upper decarbonization filler layer, and connected to the upper decarbonization filler layer.

[0018] Optionally, the decarbonization solution regeneration component includes: a decarbonization solution regeneration filler layer, which is arranged in the lower part of the internal space of the tower body and above the combustion component, the upper part of the decarbonization solution regeneration filler layer is connected to the decarbonization solution conveying component, and the lower part of the decarbonization solution regeneration filler layer is respectively connected to the regenerated decarbonization solution conveying component and the combustion component.

[0019] Optionally, the decarbonization solution regeneration component further includes: a desorption cooler, which is arranged in the lower part of the internal space of the tower body, above the decarbonization solution regeneration packing layer, and connected to the decarbonization solution regeneration packing layer.

[0020] Optionally, the combustion assembly includes: a combustion chamber and a burner, wherein the combustion chamber is arranged in the lower part of the internal space of the tower body and is located below the decarbonization solution regeneration assembly, and the burner is arranged inside the combustion chamber and is connected to the second blast furnace gas input assembly.

[0021] Optionally, the first blast furnace gas input component includes: a first flow meter and a first flow regulating valve, wherein the first flow meter is respectively connected to the first flow regulating valve and the lower decarbonization filler layer of the decarbonization component, and the first flow regulating valve is connected to blast furnace gas.

[0022] Optionally, the second blast furnace gas input component includes: a second flow meter and a second flow regulating valve, wherein the second flow meter is connected to the second flow regulating valve and the burner of the combustion component respectively, and the second flow regulating valve is connected to blast furnace gas.

[0023] Optionally, the decarbonization solution delivery component includes: a flue gas heat exchanger, a first heat exchanger and a first liquid pump, wherein the first heat exchanger is connected to the flue gas heat exchanger and the first liquid pump respectively, the flue gas heat exchanger is connected to the lower decarbonization filler layer of the decarbonization component, and the first liquid pump is connected to the decarbonization solution regeneration filler layer of the decarbonization solution regeneration component.

[0024] Optionally, the regenerated decarbonization solution delivery component includes: a second liquid pump, a second heat exchanger and a secondary cooler, wherein the second heat exchanger is connected to the second liquid pump and the secondary cooler respectively, the second liquid pump is connected to the decarbonization solution regeneration filler layer of the decarbonization solution regeneration component, and the secondary cooler is connected to the upper decarbonization filler layer of the decarbonization component.

[0025] The technical solution provided by the present invention brings at least the following beneficial effects:

[0026] The blast furnace gas decarbonization device provided in this application can reduce the carbon dioxide emission level in the blast furnace ironmaking system, while improving the calorific value of blast furnace gas, increasing the added value of gas utilization, and broadening the blast furnace gas utilization channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic structural diagram of a blast furnace gas decarbonization device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] Figure 1 A blast furnace gas decarbonization device suitable for an embodiment of the present invention is schematically shown.

[0032] Reference Figure 1 As shown, the present application provides a blast furnace gas decarbonization device, comprising:

[0033] The tower body 10 is used to install various parts;

[0034] The decarbonization component 20 is used for decarbonization; the decarbonization component 20 is arranged at the upper part of the inner space of the tower body 10;

[0035] The decarbonization solution regeneration component 30 is used to regenerate the decarbonization solution; the decarbonization solution regeneration component 30 is arranged at the lower part of the inner space of the tower body 10;

[0036] A combustion assembly 40 for burning blast furnace gas; the combustion assembly 40 is disposed in the lower portion of the interior space of the tower body 10 and is located below the decarbonization solution regeneration assembly 30 and is connected to the decarbonization solution regeneration assembly 30;

[0037] A first blast furnace gas input component 50 is used to input blast furnace gas into the decarbonization component 20; the first blast furnace gas input component 50 is connected to the decarbonization component 20;

[0038] A second blast furnace gas input assembly 60 is used to input blast furnace gas into the combustion assembly 40; the second blast furnace gas input assembly 60 is connected to the combustion assembly 40;

[0039] The decarbonization solution delivery component 70 is used to deliver the decarbonization solution; the decarbonization solution delivery component 70 is respectively connected to the lower part of the decarbonization component 20 and the upper part of the decarbonization solution regeneration component 30;

[0040] The regenerated decarbonization solution delivery component 80 is used to deliver the regenerated decarbonization solution; the regenerated decarbonization solution delivery component 80 is connected to the lower portion of the decarbonization solution regeneration component 30 and the upper portion of the decarbonization component 20 respectively.

[0041] In the embodiment of the present application, blast furnace gas is divided into two routes: first blast furnace gas and second blast furnace gas. The first blast furnace gas is connected to the first blast furnace gas input assembly 50, and the second blast furnace gas is connected to the second blast furnace gas input assembly 60. The first blast furnace gas enters the decarbonization assembly 20 through the first blast furnace gas input assembly 50. The decarbonization solution enters the decarbonization assembly 20 through the decarbonization solution delivery assembly 70. The decarbonization solution, which absorbs carbon dioxide from the first blast furnace gas, enters the decarbonization solution regeneration assembly 30. The second blast furnace gas enters the combustion assembly 40 through the second blast furnace gas input assembly 60, where it is burned and heats the decarbonization solution in the decarbonization solution regeneration assembly 30 to form steam. The steam is then delivered to the decarbonization assembly 20 through the regenerated decarbonization solution delivery assembly 80.

[0042] Exemplarily, the decarbonization component 20 includes: a lower decarbonization filler layer 21, an interstage cooler 22 and an upper decarbonization filler layer 23, wherein the lower decarbonization filler layer 21, the interstage cooler 22 and the upper decarbonization filler layer 23 are connected in sequence and arranged from bottom to top in the upper part of the internal space of the tower body 10, the lower decarbonization filler layer 21 is respectively connected to the decarbonization solution conveying component 70 and the first blast furnace gas input component 50, and the regenerated decarbonization solution conveying component 80 is connected to the upper decarbonization filler layer 23.

[0043] In an embodiment of the present application, the first blast furnace gas enters the decarbonization component 20 through the first blast furnace gas input component 50, and passes through the lower decarbonization filler layer 21, the interstage cooler 22 and the upper decarbonization filler layer 23 in sequence. During this process, the decarbonization solution enters the decarbonization component 20, and passes through the upper decarbonization filler layer 23, the interstage cooler 22 and the lower decarbonization filler layer 21 in sequence, and reacts with the first blast furnace gas. After decarbonization, the blast furnace gas is discharged through the top of the tower body 10.

[0044] Exemplarily, the decarbonization component 20 further includes: an absorption cooler 24 , which is arranged at the upper part of the internal space of the tower body 10 , above the upper decarbonization filler layer 23 , and connected to the upper decarbonization filler layer 23 .

[0045] In the embodiment of the present application, the absorption cooler 24 is connected to cooling water to cool the decarbonized blast furnace gas, reduce its heat, and ensure safety during discharge.

[0046] Exemplarily, the decarbonization solution regeneration component 30 includes: a decarbonization solution regeneration packing layer 31, which is arranged in the lower part of the internal space of the tower body 10 and is located above the combustion component 40, the upper part of the decarbonization solution regeneration packing layer 31 is connected to the decarbonization solution conveying component 70, and the lower part of the decarbonization solution regeneration packing layer 31 is respectively connected to the regenerated decarbonization solution conveying component 80 and the combustion component 40.

[0047] In an embodiment of the present application, the decarbonization solution that absorbs carbon dioxide in the first blast furnace gas enters the decarbonization solution regeneration filler layer 31 of the decarbonization solution regeneration component 30, and the second blast furnace gas enters the combustion component 40 through the second blast furnace gas input component 60 and is burned, and the decarbonization solution in the decarbonization solution regeneration filler layer 31 is heated to form steam, and the decarbonization solution steam is transported to the decarbonization component 20 for utilization through the regenerated decarbonization solution transport component 80.

[0048] Exemplarily, the decarbonization solution regeneration component 30 further includes: a desorption cooler 32, which is arranged in the lower part of the internal space of the tower body 10, and is located above the decarbonization solution regeneration packing layer 31, and is connected to the decarbonization solution regeneration packing layer 31.

[0049] In the embodiment of the present application, the second blast furnace gas is burned in the combustion assembly 40 to form combustion flue gas, and the desorption cooler 32 is connected to cooling water to cool the combustion flue gas, reduce its heat, and ensure safety during discharge.

[0050] Exemplarily, the combustion assembly 40 includes: a combustion chamber 41 and a burner 42, wherein the combustion chamber 41 is arranged in the lower part of the internal space of the tower body 10 and is located below the decarbonization solution regeneration assembly 30, and the burner 42 is arranged inside the combustion chamber 41 and is connected to the second blast furnace gas input assembly 60.

[0051] In the embodiment of the present application, the burner 42 ignites the second blast furnace gas input into the combustion chamber 41 , and the second blast furnace gas burns in the combustion chamber 41 .

[0052] Exemplarily, the first blast furnace gas input component 50 includes: a first flow meter 51 and a first flow regulating valve 52, wherein the first flow meter 51 is respectively connected to the first flow regulating valve 52 and the lower decarbonization filler layer 21 of the decarbonization component 20, and the first flow regulating valve 52 is connected to the blast furnace gas.

[0053] In the embodiment of the present application, the first blast furnace gas passes through the first flow regulating valve 52 and the first flow meter 51 in sequence and enters the decarbonization component 20.

[0054] Exemplarily, the second blast furnace gas input component 60 includes: a second flow meter 61 and a second flow regulating valve 62, wherein the second flow meter 61 is respectively connected to the second flow regulating valve 62 and the burner 42 of the combustion component 40, and the second flow regulating valve 62 is connected to blast furnace gas.

[0055] In the embodiment of the present application, the second blast furnace gas enters the combustion assembly 40 through the second flow regulating valve 62 and the second flow meter 61 in sequence.

[0056] Exemplarily, the decarbonization solution delivery component 70 includes: a flue gas heat exchanger 71, a first heat exchanger 72 and a first liquid pump 73, wherein the first heat exchanger 72 is connected to the flue gas heat exchanger 71 and the first liquid pump 73 respectively, the flue gas heat exchanger 71 is connected to the lower decarbonization filler layer 21 of the decarbonization component 20, and the first liquid pump 73 is connected to the decarbonization solution regeneration filler layer 31 of the decarbonization solution regeneration component 30.

[0057] In the embodiment of the present application, the decarbonization solution passes through the upper decarbonization filler layer 23, the interstage cooler 22 and the lower decarbonization filler layer 21 in sequence, and then passes through the flue gas heat exchanger 71, the first heat exchanger 72 and the first liquid pump 73 to be pumped to the regenerated decarbonization solution delivery component 80.

[0058] Exemplarily, the regenerated decarbonization solution conveying component 80 includes: a second liquid pump 81, a second heat exchanger 82 and a secondary cooler 83, wherein the second heat exchanger 82 is connected to the second liquid pump 81 and the secondary cooler 83 respectively, the second liquid pump 81 is connected to the decarbonization solution regeneration packing layer 31 of the decarbonization solution regeneration component 30, and the secondary cooler 83 is connected to the upper decarbonization packing layer 23 of the decarbonization component 20.

[0059] In the embodiment of the present application, the decarbonization solution vapor is lifted by the second liquid pump 81 and sequentially passes through the second heat exchanger 82 and the secondary cooler 83 before entering the upper portion of the decarbonization component 20 for spraying.

[0060] In the embodiment of the present application, the second blast furnace gas passes through the combustion chamber 41 after combustion, and flows upward in the decarbonization solution regeneration component 30 until it leaves the decarbonization solution regeneration component 30 and is discharged after passing through the flue gas heat exchanger 71.

[0061] Example 1:

[0062] One path of blast furnace gas passes through the first blast furnace gas input component 50 and enters the decarbonization component 20 with a flow rate of 100 Nm3 / h. The other path passes through the second blast furnace gas input component 60 and enters the decarbonization solution regeneration component 30 with a flow rate of 25 Nm3 / h. The decarbonization solution circulation volume of the first liquid pump 73 and the second liquid pump 81 is 500 L / h. The temperature of the combustion chamber 41 in the decarbonization solution regeneration component 30 is 200°C, the temperature of the flue gas discharged after combustion is 80°C, the flow rate is 300 Nm3 / h, the circulation volume of cooling water 1 is 6 Nm3 / h, the circulation volume of cooling water 2 is 2 Nm3 / h, the inlet and outlet temperatures of the cooling water are 15°C and 50°C respectively, the carbon dioxide concentration in the decarbonization solution regeneration component 30 is 99.0%, and the carbon dioxide content of the blast furnace gas after decarbonization is 0.5%.

[0063] The results of the operations of Examples 2-8 are shown in the following table:

[0064]

[0065]

[0066] The blast furnace gas decarbonization device provided in this application can reduce the carbon dioxide emission level in the blast furnace ironmaking system, while improving the calorific value of blast furnace gas, increasing the added value of gas utilization, and broadening the blast furnace gas utilization channels.

[0067] It should be noted that, in this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0068] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0069] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0070] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0071] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A blast furnace gas decarbonization device, characterized in that: include: Tower body, used for installing various parts; Decarburization component, used for decarburization; The decarbonization assembly is arranged at the upper part of the inner space of the tower body; A decarbonization solution regeneration component is used to regenerate the decarbonization solution; the decarbonization solution regeneration component is arranged in the lower part of the internal space of the tower body; A combustion assembly for burning blast furnace gas; the combustion assembly is arranged in the lower part of the internal space of the tower body, and is located below the decarbonization solution regeneration assembly and is connected to the decarbonization solution regeneration assembly; a first blast furnace gas input component, used for inputting blast furnace gas into the decarbonization component; The first blast furnace gas input component is connected to the decarbonization component; a second blast furnace gas input assembly, for inputting blast furnace gas into the combustion assembly; the second blast furnace gas input assembly is connected to the combustion assembly; A decarbonization solution delivery assembly is used to deliver the decarbonization solution; the decarbonization solution delivery assembly is connected to the lower portion of the decarbonization assembly and the upper portion of the decarbonization solution regeneration assembly respectively; The regeneration decarbonization solution delivery component is used to deliver the regeneration decarbonization solution; the regeneration decarbonization solution delivery component is respectively connected to the lower part of the decarbonization solution regeneration component and the upper part of the decarbonization component.

2. The blast furnace gas decarbonization device according to claim 1, characterized in that: The decarbonization component includes: a lower decarbonization filler layer, an interstage cooler and an upper decarbonization filler layer, wherein the lower decarbonization filler layer, the interstage cooler and the upper decarbonization filler layer are connected in sequence and arranged from bottom to top in the upper part of the internal space of the tower body, the lower decarbonization filler layer is respectively connected to the decarbonization solution conveying component and the first blast furnace gas input component, and the regenerated decarbonization solution conveying component is connected to the upper decarbonization filler layer.

3. The blast furnace gas decarbonization device according to claim 2, characterized in that: The decarbonization component further includes an absorption cooler, which is arranged at the upper part of the inner space of the tower body, located above the upper decarbonization filler layer, and connected to the upper decarbonization filler layer.

4. The blast furnace gas decarbonization device according to claim 1, characterized in that: The decarbonization solution regeneration component includes: a decarbonization solution regeneration filler layer, which is arranged in the lower part of the internal space of the tower body and above the combustion component. The upper part of the decarbonization solution regeneration filler layer is connected to the decarbonization solution conveying component, and the lower part of the decarbonization solution regeneration filler layer is respectively connected to the regenerated decarbonization solution conveying component and the combustion component.

5. The blast furnace gas decarbonization device according to claim 4, characterized in that: The decarbonization solution regeneration component further includes: a desorption cooler, which is arranged in the lower part of the internal space of the tower body, above the decarbonization solution regeneration packing layer, and connected to the decarbonization solution regeneration packing layer.

6. The blast furnace gas decarbonization device according to claim 1, characterized in that: The combustion assembly includes: a combustion chamber and a burner, wherein the combustion chamber is arranged in the lower part of the internal space of the tower body and is located below the decarbonization solution regeneration assembly, and the burner is arranged inside the combustion chamber and is connected to the second blast furnace gas input assembly.

7. The blast furnace gas decarbonization device according to claim 1, characterized in that: The first blast furnace gas input component includes: a first flow meter and a first flow regulating valve, wherein the first flow meter is connected to the first flow regulating valve and the lower decarbonization filler layer of the decarbonization component respectively, and the first flow regulating valve is connected to blast furnace gas.

8. The blast furnace gas decarbonization device according to claim 1, characterized in that: The second blast furnace gas input component includes: a second flow meter and a second flow regulating valve, wherein the second flow meter is connected to the second flow regulating valve and the burner of the combustion component respectively, and the second flow regulating valve is connected to blast furnace gas.

9. The blast furnace gas decarbonization device according to claim 1, characterized in that: The decarbonization solution delivery component includes: a flue gas heat exchanger, a first heat exchanger and a first liquid pump, wherein the first heat exchanger is connected to the flue gas heat exchanger and the first liquid pump respectively, the flue gas heat exchanger is connected to the lower decarbonization filler layer of the decarbonization component, and the first liquid pump is connected to the decarbonization solution regeneration filler layer of the decarbonization solution regeneration component.

10. The blast furnace gas decarbonization device according to claim 1, characterized in that: The regenerated decarbonization solution delivery component includes: a second liquid pump, a second heat exchanger and a secondary cooler, wherein the second heat exchanger is connected to the second liquid pump and the secondary cooler respectively, the second liquid pump is connected to the decarbonization solution regeneration filler layer of the decarbonization solution regeneration component, and the secondary cooler is connected to the upper decarbonization filler layer of the decarbonization component.

Images