Sintering flue gas denitration reaction tower capable of being rapidly cut off

Abstract

The utility model relates to a sintering flue gas denitration reaction tower capable of being quickly cut off, which comprises a reaction tower body, a CO removal catalyst module, a denitration catalyst module, a first flue gas valve, a second flue gas valve, a chimney, a flue gas main pipe and a flue gas branch pipe, the CO removal catalyst module, the denitration catalyst module, the first flue gas valve and the second flue gas valve are all installed in the reaction tower body, the CO removal catalyst module is located below the denitration catalyst module, the first flue gas valve is located above the CO removal catalyst module, and the second flue gas valve is located above the denitration catalyst module. The second flue gas valve is positioned below the CO removal catalyst module; the bottom of the reaction tower body is connected and communicated with a chimney through a flue gas main pipe, the side wall of the reaction tower body is connected and communicated with the flue gas main pipe through a flue gas branch pipe, and the joint of the flue gas branch pipe and the side wall of the reaction tower body is located between the first flue gas valve and the adjacent denitration catalyst module.

Description

Technical Field

[0001] The utility model relates to the technical field of CO removal treatment of sintering machine flue gas in the steel industry, in particular to a sintering flue gas denitration reaction tower which can be quickly cut off. Background Art

[0002] Sintering flue gas from the steel industry is the main source of air pollution in the steel industry. Sintering flue gas contains a large amount of CO. The main CO end-of-pipe treatment technology is CO catalytic combustion technology. However, the cost of de-CO catalysts is high and their sulfur resistance is poor. When the desulfurization device fails for a short time, the de-CO catalyst needs to be protected. The de-CO catalyst protection mechanism requires simple operation and fast action to protect the de-CO catalyst. Utility Model Content

[0003] In order to solve one or more technical problems in the prior art, the utility model provides a sintering flue gas denitration reaction tower that can be quickly cut off.

[0004] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a sintering flue gas denitration reaction tower capable of rapid shutoff, comprising a reaction tower body, a de-CO catalyst module, a de-NOx catalyst module, a first flue gas valve, a second flue gas valve, a chimney, a flue gas main pipe and a flue gas branch pipe, wherein the de-CO catalyst module, the de-NOx catalyst module, the first flue gas valve and the second flue gas valve are all installed in the reaction tower body, the de-CO catalyst module is located below the de-NOx catalyst module, the first flue gas valve is located above the de-CO catalyst module, and the second flue gas valve is located below the de-CO catalyst module; the bottom of the reaction tower body is connected to and communicated with the chimney through the flue gas main pipe, the side wall of the reaction tower body is connected to and communicated with the flue gas main pipe through the flue gas branch pipe, and the connection between the flue gas branch pipe and the side wall of the reaction tower body is located between the first flue gas valve and the adjacent de-NOx catalyst module.

[0005] The beneficial effects of the utility model are as follows: the utility model can quickly cut off the sintering flue gas denitrification reaction tower. When the desulfurization device fails, the first flue gas valve can be quickly closed, the flue gas branch pipe can be opened in a chain manner, and the upstream flue gas can be cut off from entering the de-CO catalyst module. The upstream flue gas enters the chimney through the flue gas branch pipe, avoiding the de-CO catalyst module from being in contact with the flue gas for a long time, and can protect the de-CO catalyst when the desulfurization device fails and causes the flue gas SO2 to exceed the standard for a short time.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the first flue gas valve is a first multi-louver flue gas valve.

[0008] The beneficial effects of adopting the above further scheme are as follows: By adopting a multi-louvered flue gas valve, it is convenient to cut off or open the flue gas passage in the reaction tower body.

[0009] Further, the second flue gas valve is a second multi-louvered flue gas valve.

[0010] The beneficial effects of adopting the above further scheme are as follows: By adopting a multi-louvered flue gas valve, it is convenient to cut off or open the flue gas passage in the reaction tower body.

[0011] Further, a first valve is provided on the flue gas branch pipe.

[0012] Further, the denitration catalyst modules are arranged in multiple layers, and the multiple denitration catalyst modules are installed at intervals up and down in the reaction tower body.

[0013] Further, the denitration catalyst modules are arranged in two or three layers.

[0014] Further, a first rake-type soot blower and a second rake-type soot blower both using compressed air or inert gas as the purging medium are provided in the reaction tower body. The first rake-type soot blower is installed between the first flue gas valve and the decarbonylation catalyst module, and a group of second rake-type soot blowers are installed above each denitration catalyst module.

[0015] The beneficial effects of adopting the above further scheme are as follows: By setting the rake-type soot blower, when the first flue gas valve is closed, the decarbonylation catalyst module can be purged by the first rake-type soot blower, and after quickly purging the high-sulfur flue gas, the second flue gas valve is closed to place the decarbonylation catalyst module in a safe atmosphere, playing a role in protecting the decarbonylation catalyst module.

[0016] Further, the first rake-type soot blower is connected to the main purging pipeline where the purging medium source is located through a first branch, and the second rake-type soot blower is connected to the main purging pipeline where the purging medium source is located through a second branch.

[0017] Further, a second valve is provided on the main purging pipeline.

[0018] Further, the top flue gas pipe of the reaction tower body is connected and communicated with the desulfurization device. Description of the Drawings

[0019] Figure 1 It is a schematic internal structure diagram of the sintering flue gas denitration reaction tower capable of quickly cutting off according to the present utility model;

[0020] Figure 2 It is a schematic structure diagram of the first flue gas valve of the present utility model.

[0021] In the drawings, the list of components represented by each reference numeral is as follows:

[0022] 1. Reaction tower body; 2. CO removal catalyst module; 3. Denitration catalyst module; 4. First flue gas valve; 5. Second flue gas valve; 6. Chimney; 7. Main flue gas pipe; 8. Flue gas branch pipe; 9. Purge medium source; 10. First valve; 11. Second valve; 12. First rake type soot blower; 13. Second rake type soot blower; 14. Desulfurization device. Specific embodiments

[0023] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0024] As Figure 1 and Figure 2 shown, a sintering flue gas denitration reaction tower capable of quickly cutting off in this embodiment includes a reaction tower body 1, a CO removal catalyst module 2, a denitration catalyst module 3, a first flue gas valve 4, a second flue gas valve 5, a chimney 6, a main flue gas pipe 7 and a flue gas branch pipe 8. The CO removal catalyst module 2, the denitration catalyst module 3, the first flue gas valve 4 and the second flue gas valve 5 are all installed in the reaction tower body 1. The CO removal catalyst module 2 is located below the denitration catalyst module 3. The first flue gas valve 4 is located above the CO removal catalyst module 2. The second flue gas valve 5 is located below the CO removal catalyst module 2. The bottom of the reaction tower body 1 is connected and communicated with the chimney 6 through the main flue gas pipe 7. The side wall of the reaction tower body 1 is connected and communicated with the main flue gas pipe 7 through the flue gas branch pipe 8. The connection part of the flue gas branch pipe 8 and the side wall of the reaction tower body 1 is located between the first flue gas valve 4 and the adjacent denitration catalyst module 3.

[0025] As Figure 1 shown, a preferred solution in this embodiment is that the first flue gas valve 4 is a first multi - louver type flue gas valve. Using a multi - louver type flue gas valve is convenient for cutting off or opening the flue gas channel in the reaction tower body.

[0026] A preferred solution in this embodiment is that the second flue gas valve 5 is a second multi - louver type flue gas valve. Using a multi - louver type flue gas valve is convenient for quickly cutting off or opening the flue gas channel in the reaction tower body.

[0027] Optionally, the first flue gas valve 4 and the second flue gas valve 5 in this embodiment can adopt electric - type valves or pneumatic - type valves. In order to reduce the influence of SO2 in the flue gas on the CO removal catalyst module, the flue gas valves adopt zero - leakage high - temperature - resistant valves.

[0028] Specifically, as Figure 1 shown, a first valve 10 is provided on the flue gas branch pipe 8.

[0029] Specifically, as Figure 1 shown, a plurality of the denitration catalyst modules 3 are provided, and the plurality of denitration catalyst modules 3 are installed at intervals up and down in the reaction tower body 1.

[0030] Preferably, as Figure 1 shown, the denitration catalyst module 3 is provided with two or three layers.

[0031] As Figure 1 shown, a first rake-type soot blower 12 and a second rake-type soot blower 13 that both use compressed air or inert gas as the purging medium are further provided in the reaction tower body 1. The first rake-type soot blower 12 is installed between the first flue gas valve 4 and the decarbonylation catalyst module 2, and a group of second rake-type soot blowers 13 are installed above each denitration catalyst module 3. By providing the rake-type soot blowers, when the first flue gas valve is closed, the decarbonylation catalyst module can be purged by the first rake-type soot blower, and after quickly purging the high-sulfur flue gas, the second flue gas valve is closed to place the decarbonylation catalyst module in a safe atmosphere, playing a role in protecting the decarbonylation catalyst module.

[0032] As Figure 1 shown, the first rake-type soot blower 12 of this embodiment is connected to the main purging pipeline where the purging medium source 9 is located through a first branch, and the second rake-type soot blower 13 is connected to the main purging pipeline where the purging medium source 9 is located through a second branch.

[0033] As Figure 1 shown, a second valve 11 is provided on the main purging pipeline of this embodiment.

[0034] As Figure 1 shown, the top flue gas pipe of the reaction tower body 1 of this embodiment is connected and communicated with the desulfurization device 14.

[0035] The valves, desulfurization devices, rake-type soot blowers, etc. in this embodiment can adopt common structures in the art.

[0036] When the sintering flue gas denitrification reaction tower capable of rapid cut-off in this embodiment is in use, the sintering flue gas is successively subjected to desulfurization and dust removal, denitrification, and CO removal, and finally discharged through a chimney. The sulfur tolerance of the CO removal catalyst is poor. When the desulfurization device fails, the CO removal catalyst will be sulfur poisoned and rendered ineffective in a short time. Since the CO removal catalyst contains precious metal components, the CO removal catalyst is expensive, and the failure of the CO removal catalyst will cause great economic losses. By installing a first flue gas valve and a second flue gas valve before and after the CO removal catalyst module respectively, and at the same time arranging a flue gas branch pipe between the first flue gas valve and the denitrification catalyst module, when the desulfurization device fails, the upstream flue gas entering the CO removal catalyst module can be cut off by quickly closing the first flue gas valve and interlocking to open the first valve on the bypass flue gas branch pipe, and the upstream flue gas enters the chimney through the flue gas branch pipe. At the same time, the CO removal catalyst module is purged by a first rake-type soot blower, and after quickly purging the high-sulfur flue gas, the second flue gas valve is closed, so that the CO removal catalyst module can be placed in a safe atmosphere, playing a role in protecting the CO removal catalyst module.

[0037] For the sintering flue gas denitrification reaction tower capable of rapid cut-off in this embodiment, when the desulfurization device fails, the upstream flue gas entering the CO removal catalyst module can be cut off by quickly closing the first flue gas valve and interlocking to open the flue gas branch pipe, and the upstream flue gas enters the chimney through the flue gas branch pipe, avoiding the CO removal catalyst module from contacting the flue gas for a long time, and protecting the CO removal catalyst when the flue gas SO2 exceeds the standard for a short time due to the failure of the desulfurization device.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In the present utility model, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A sintering flue gas denitration reaction tower capable of rapid cutting-off, characterized in that, It includes a reaction tower body, a CO removal catalyst module, a denitration catalyst module, a first flue gas valve, a second flue gas valve, a chimney, a main flue gas pipe and a flue gas branch pipe. The CO removal catalyst module, the denitration catalyst module, the first flue gas valve and the second flue gas valve are all installed in the reaction tower body. The CO removal catalyst module is located below the denitration catalyst module. The first flue gas valve is located above the CO removal catalyst module. The second flue gas valve is located below the CO removal catalyst module. The bottom of the reaction tower body is connected and communicated with the chimney through the main flue gas pipe. The side wall of the reaction tower body is connected and communicated with the main flue gas pipe through the flue gas branch pipe. The connection point of the flue gas branch pipe and the side wall of the reaction tower body is located between the first flue gas valve and the adjacent denitration catalyst module.

2. The rapid-cutoff sintered flue gas denitration reaction tower according to claim 1, wherein The first flue gas valve is a first multi-louver type flue gas valve.

3. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 1, wherein The second flue gas valve is a second multi-louver type flue gas valve.

4. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 1, characterized in that, A first valve is provided on the flue gas branch pipe.

5. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 1, characterized in that The denitration catalyst module is provided with multiple layers, and the multiple layers of denitration catalyst modules are installed at intervals up and down in the reaction tower body.

6. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 5, wherein The denitration catalyst module is provided with two or three layers.

7. The rapid-cutoff sintered flue gas denitration reaction tower according to claim 1, characterized in that, A first rake type soot blower and a second rake type soot blower, both of which use compressed air or inert gas as the purging medium, are further provided in the reaction tower body. The first rake type soot blower is installed between the first flue gas valve and the CO removal catalyst module. A set of second rake type soot blowers is installed above each denitration catalyst module.

8. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 7, wherein The first rake type soot blower is communicated with the main purging pipeline where the purging medium source is located through a first branch. The second rake type soot blower is communicated with the main purging pipeline where the purging medium source is located through a second branch.

9. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 8, characterized in that, A second valve is provided on the main purging pipeline.

10. The rapid-cutoff sintering flue gas denitration reaction tower according to claim 1, wherein The top flue gas pipe of the reaction tower body is connected and communicated with the desulfurization device.

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