An external CO removal device behind the sintering flue gas denitrification reaction tower

Abstract

The utility model relates to an external CO removal device behind a sintering flue gas denitration reaction tower, comprising a denitration reaction tower and a deCO reaction tower, wherein the deCO reaction tower is located outside the denitration reaction tower, the bottom of the deCO reaction tower is connected with a deCO flue gas exhaust pipe, the top of the deCO reaction tower is connected with a flue gas inlet pipe, the flue gas inlet pipe is connected and communicated with the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower, and the deCO flue gas exhaust pipe is communicated with a chimney. The utility model relates to an external CO removal device behind a sintering flue gas denitration reaction tower, by arranging a deCO reaction tower behind the denitration reaction tower, the equipment is easy to operate, the flue gas after denitration enters the deCO reaction tower again for CO removal, the ammonia escape value is reduced, and multi-pollution coordinated treatment is achieved, which can reduce pollutant emissions, reduce carbon emissions, and reduce coal gas consumption.

Description

Technical Field

[0001] The utility model relates to a sintering flue gas treatment technology in the steel industry, in particular to an external CO removal device behind a sintering flue gas denitration reaction tower. Background Art

[0002] Sintering flue gas in the steel industry is the main source of air pollution in steel enterprises, accounting for more than 60% of steel air pollutants. Sintering flue gas contains pollutants such as SO2, NOx, CO, and dust, which have the characteristics of high content, complex composition, and large variation. Now the national policies and environmental protection requirements are becoming more and more stringent. The reserved layer in some sintering flue gas denitration reaction towers has been filled with denitration catalysts, and it is impossible to fill the denitration reaction tower with CO catalyst fillers. Utility Model Content

[0003] In order to solve one or more technical problems existing in the prior art, the utility model provides an external CO removal device behind a sintering flue gas denitration reaction tower.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a device for externally removing CO from a sintering flue gas denitration reaction tower, comprising a denitration reaction tower and a deCO reaction tower, wherein the deCO reaction tower is located outside the denitration reaction tower, a deCO flue gas exhaust pipe is connected to the bottom of the deCO reaction tower, a flue gas inlet pipe is connected to the top of the deCO reaction tower, the flue gas inlet pipe is connected and communicated with the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower, and the deCO flue gas exhaust pipe is communicated with a chimney.

[0005] The beneficial effects of the utility model are as follows: the utility model is a device for externally removing CO from a sintering flue gas denitration reaction tower. By arranging a deCO reaction tower after the denitration reaction tower, the equipment is easy to operate. The flue gas that has undergone denitration then enters the deCO reaction tower for CO removal, thereby reducing the ammonia escape value, realizing coordinated treatment of multiple pollutions, and being able to reduce pollutant emissions and carbon emissions.

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

[0007] Furthermore, a partition is provided inside the denitrification flue gas exhaust pipe at the bottom of the denitrification reaction tower, and the partition divides the denitrification flue gas exhaust pipe into a first exhaust pipe section and a second exhaust pipe section which are independent and non-connected with each other, the first exhaust pipe section is connected to the bottom of the denitrification reaction tower, and the second exhaust pipe section is connected to the chimney; the flue gas inlet pipe is connected to the first exhaust pipe section, and the de-CO flue gas exhaust pipe is connected to the second exhaust pipe section.

[0008] The beneficial effect of adopting the above further scheme is: by setting a partition in the denitrification flue gas exhaust pipe, the original pipeline at the bottom of the denitrification reaction tower can be used, and there is no need to set up additional pipelines, which saves pipelines, has a compact structure, and is easy to connect.

[0009] Furthermore, a heat exchanger is provided on the second discharge pipe section, and the second discharge pipe section is connected to the clean flue gas side of the heat exchanger.

[0010] The beneficial effect of adopting the above further scheme is that the setting of the heat exchanger can utilize the heat of the flue gas discharged from the de-CO reaction tower to heat the initial flue gas entering the de-nitrification reaction tower, which can reduce the amount of coal gas used.

[0011] Furthermore, the heat exchanger is installed on the second exhaust pipe section downstream of the de-CO flue gas exhaust pipe.

[0012] Furthermore, the second discharge pipe section is connected to an outlet CO online analyzer.

[0013] The beneficial effect of adopting the above further scheme is that CO online detection and analysis can be performed on the flue gas passing through the CO removal reaction tower.

[0014] Furthermore, the flue gas inlet pipe is connected to an inlet CO online analyzer.

[0015] The beneficial effect of adopting the above further scheme is that CO online detection and analysis can be performed on the flue gas entering the CO removal reaction tower.

[0016] Furthermore, a CO catalyst packing layer is provided in the CO removal reaction tower.

[0017] Furthermore, the CO removal reaction tower is provided with a first rake soot blower using compressed air or inert gas as a purge medium, and the first rake soot blower is located above the CO catalyst packing layer.

[0018] Furthermore, multiple layers of denitration catalyst packing layers are arranged in the denitration reaction tower.

[0019] Furthermore, the denitration reaction tower is provided with a plurality of second rake soot blowers using compressed air or inert gas as the purge medium, and one of the second rake soot blowers is provided above each denitration catalyst packing layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an external CO removal device behind a sintering flue gas denitration reaction tower according to the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Denitration reaction tower; 2. De-CO reaction tower; 3. De-CO flue gas exhaust pipe; 4. Flue gas inlet pipe; 5. First exhaust pipe section; 6. Chimney; 7. Partition; 8. Second exhaust pipe section; 9. Heat exchanger; 10. Outlet CO online analyzer; 11. Inlet CO online analyzer; 12. CO catalyst packing layer; 13. First rake soot blower; 14. De-NOx catalyst packing layer; 15. Second rake soot blower. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1 As shown, a device for external CO removal after a sintering flue gas denitration reaction tower in this embodiment comprises a denitration reaction tower 1 and a deCO reaction tower 2, wherein the deCO reaction tower 2 is located outside the denitration reaction tower 1, a deCO flue gas exhaust pipe 3 is connected to the bottom of the deCO reaction tower 2, a flue gas inlet pipe 4 is connected to the top of the deCO reaction tower 2, the flue gas inlet pipe 4 is connected and communicated with the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower 1, and the deCO flue gas exhaust pipe is communicated with the chimney 6.

[0025] like Figure 1 As shown, a preferred solution of this embodiment is that a partition 7 is provided inside the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower 1, and the partition 7 divides the denitration flue gas exhaust pipe into a first exhaust pipe section 5 and a second exhaust pipe section 8 that are independent and not connected to each other. The first exhaust pipe section 5 is connected to the bottom of the denitration reaction tower 1, and the second exhaust pipe section 8 is connected to the chimney 6; the flue gas inlet pipe 4 is connected to the first exhaust pipe section 5, and the deCO flue gas exhaust pipe 3 is connected to the second exhaust pipe section 8. The partition can also be replaced by a baffle door; by setting a partition in the denitration flue gas exhaust pipe, the original pipeline at the bottom of the denitration reaction tower can be used, and there is no need to set up additional pipelines, saving pipelines, compact structure, and convenient connection.

[0026] like Figure 1 As shown, the second discharge pipe section 8 of this embodiment is provided with a heat exchanger 9, the second discharge pipe section 8 is connected to the clean flue gas side of the heat exchanger 9, the raw flue gas side of the heat exchanger 9 is connected to the initial flue gas input pipe, and the initial flue gas input pipe is connected to the top of the denitration reaction tower 1. The heat exchanger 9 is a GGH heat exchanger. The setting of the heat exchanger can utilize the heat of the flue gas discharged from the de-CO reaction tower to heat the initial flue gas entering the denitration reaction tower, which can reduce the amount of coal gas used.

[0027] Furthermore, the heat exchanger 9 is installed on the second exhaust pipe section 8 downstream of the CO removal flue gas exhaust pipe 3 .

[0028] like Figure 1 As shown, the second discharge pipe section 8 of this embodiment is connected to an outlet CO online analyzer 10, which can perform CO online detection and analysis on the flue gas passing through the CO removal reaction tower.

[0029] like Figure 1 As shown, the flue gas inlet pipe 4 of this embodiment is connected to an inlet CO online analyzer 11, which can perform CO online detection and analysis on the flue gas entering the de-CO reaction tower.

[0030] like Figure 1 As shown, a CO catalyst packing layer 12 is provided in the CO removal reaction tower 2 of this embodiment.

[0031] like Figure 1 As shown, the CO removal reaction tower 2 of this embodiment is equipped with a first rake soot blower 13 using compressed air or inert gas as a purge medium, and the first rake soot blower 13 is located above the CO catalyst packing layer 12 .

[0032] like Figure 1 As shown, the denitration reaction tower 1 of this embodiment is provided with multiple layers of denitration catalyst packing layers 14. The denitration reaction tower 1 is provided with multiple second rake soot blowers 15 using compressed air or inert gas as the purge medium, and each layer of the denitration catalyst packing layer 14 is provided with a second rake soot blower 15.

[0033] The first rake soot blower 13 and the second rake soot blower 15 are both connected to a compressed air source or an inert gas source through a soot blowing pipeline, and a control valve, a flow meter, etc. can be provided on the soot blowing pipeline to adjust the air flow rate.

[0034] The device for externally removing CO after the sintering flue gas denitration reaction tower of this embodiment can synergistically remove NOx, CO and dioxins. The process is as follows: the flue gas after desulfurization and heat exchange is sent into the denitration reaction tower through the flue gas inlet pipe at the top of the denitration reaction tower, and then discharged from the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower; the denitration catalyst packing layer inside the denitration reaction tower has been fully filled; the de-CO reaction tower is connected to the flue gas inlet pipe at the top and the de-CO flue gas exhaust pipe at the bottom, and the flue gas inlet pipe and the de-CO flue gas exhaust pipe are connected to the first exhaust pipe section and the second exhaust pipe section respectively; the flue gas after denitration in the denitration reaction tower enters the de-CO reaction tower through the first exhaust pipe section, and before entering, it is first analyzed by the inlet CO online analyzer for CO, and then after the CO catalyst packing layer of the de-CO reaction tower reacts, the CO in the flue gas is removed, and then it enters the heat exchanger through the de-CO flue gas exhaust pipe and the second exhaust pipe section for heat exchange, and then it is discharged through the chimney.

[0035] The present embodiment provides an external CO removal device after a sintering flue gas denitration reaction tower. By arranging a CO removal reaction tower after the denitration reaction tower, the equipment is easy to operate. The flue gas after denitration enters the CO removal reaction tower to remove CO, thereby reducing the ammonia escape value and realizing coordinated treatment of multiple pollutions. It can reduce pollutant emissions, reduce carbon emissions, and reduce the consumption of coal gas (for example, blast furnace gas, converter gas, coke oven gas, etc.).

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A device for removing CO externally after a sintering flue gas denitration reaction tower, characterized in that: The invention comprises a denitration reaction tower and a de-CO reaction tower, wherein the de-CO reaction tower is located outside the denitration reaction tower, a de-CO flue gas exhaust pipe is connected to the bottom of the de-CO reaction tower, a flue gas inlet pipe is connected to the top of the de-CO reaction tower, the flue gas inlet pipe is connected and communicated with the denitration flue gas exhaust pipe at the bottom of the denitration reaction tower, and the de-CO flue gas exhaust pipe is communicated with a chimney.

2. According to claim 1, a device for removing CO externally after a sintering flue gas denitration reaction tower, characterized in that: A partition is provided inside the denitrification flue gas exhaust pipe at the bottom of the denitrification reaction tower, and the partition divides the denitrification flue gas exhaust pipe into a first exhaust pipe section and a second exhaust pipe section that are independent and non-connected with each other. The first exhaust pipe section is connected to the bottom of the denitrification reaction tower, and the second exhaust pipe section is connected to the chimney; the flue gas inlet pipe is connected to the first exhaust pipe section, and the de-CO flue gas exhaust pipe is connected to the second exhaust pipe section.

3. According to claim 2, a device for removing CO externally after a sintering flue gas denitration reaction tower, characterized in that: The second discharge pipe section is provided with a heat exchanger, and the second discharge pipe section is communicated with the clean flue gas side of the heat exchanger.

4. According to claim 3, the device for removing CO externally after the sintering flue gas denitration reaction tower is characterized in that: The heat exchanger is installed on the second exhaust pipe section downstream of the de-CO flue gas exhaust pipe.

5. The device for removing CO externally after the sintering flue gas denitration reaction tower according to any one of claims 2 to 4, characterized in that: The second discharge pipe section is connected to an outlet CO online analyzer.

6. The device for removing CO externally after the sintering flue gas denitration reaction tower according to any one of claims 1 to 4, characterized in that: The flue gas inlet pipe is connected with an inlet CO online analyzer.

7. The device for removing CO externally after the sintering flue gas denitration reaction tower according to any one of claims 1 to 4, characterized in that: A CO catalyst packing layer is arranged in the CO removal reaction tower.

8. The device for removing CO externally after the sintering flue gas denitration reaction tower according to claim 7 is characterized in that: The CO removal reaction tower is provided with a first rake soot blower using compressed air or inert gas as a purge medium, and the first rake soot blower is located above the CO catalyst packing layer.

9. The device for removing CO externally after the sintering flue gas denitration reaction tower according to any one of claims 1 to 4, characterized in that: The denitration reaction tower is provided with multiple layers of denitration catalyst filler layers.

10. The device for removing CO externally after the sintering flue gas denitration reaction tower according to claim 9, characterized in that: The denitration reaction tower is provided with a plurality of second rake soot blowers using compressed air or inert gas as the purge medium, and one of the second rake soot blowers is arranged above each denitration catalyst packing layer.

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