A device for removing CO from sintering flue gas before spraying ammonia for denitrification

Abstract

The utility model relates to a device for removing CO before spraying ammonia for denitrification of sintering flue gas, comprising a denitrification reaction tower and a deCO reaction tower, wherein the deCO reaction tower is located outside the denitrification reaction tower; the top of the deCO reaction tower is connected to a flue gas input pipe to be deCOed, the bottom of the deCO reaction tower is connected to a deCO flue gas discharge pipe, the deCO flue gas discharge pipe is connected and communicated with a flue gas inlet pipe at the top of the denitrification reaction tower, and the flue gas discharge pipe at the bottom of the denitrification reaction tower is connected to a chimney. The utility model relates to a device for removing CO before spraying ammonia for denitrification of sintering flue gas, which can remove CO before spraying ammonia for denitrification, reduce the influence of ammonia on CO catalyst, improve the deCO efficiency, and thus make more CO undergo catalytic combustion, reduce heat loss, and save more coal gas.

Description

Technical Field

[0001] The utility model relates to a sintering machine flue gas treatment technology in the steel industry, in particular to a device for removing CO before denitrification and ammonia spraying of sintering flue gas. Background Art

[0002] Sintering flue gas in the steel industry is the main source of air pollution in the steel industry, accounting for more than 60% of steel air pollutants. Sintering flue gas has the characteristics of large fluctuations, many types of pollutants, and complex components. As national environmental protection policies and environmental protection requirements become more and more stringent, the reserved layer of the sintering flue gas denitrification reactor has basically been filled with denitrification catalyst fillers. In order to achieve the purpose of deCO treatment of sintering flue gas, a deCO equipment needs to be set up. Utility Model Content

[0003] In order to solve one or more technical problems existing in the prior art, the utility model provides a device for removing CO before spraying ammonia in sintering flue gas denitration.

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

[0005] The beneficial effects of the utility model are as follows: the utility model provides a device for removing CO before spraying ammonia for denitrification of sintering flue gas, which can remove CO before spraying ammonia for denitrification, reduce the influence of ammonia on the CO catalyst, improve the CO removal efficiency, and thus enable more CO to be catalytically burned, reduce heat loss, and save more coal gas.

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

[0007] Furthermore, a partition is provided in the flue gas inlet pipe, which divides the flue gas inlet pipe into a first flue gas inlet pipe section and a second flue gas inlet pipe section that are independent and unconnected to each other. The first flue gas inlet pipe section is connected to the top of the denitrification reaction tower, and the second flue gas inlet pipe section is used to introduce desulfurized flue gas; the de-CO flue gas exhaust pipe is connected to the first flue gas inlet pipe section, and the flue gas to be de-CO is connected to the second flue gas inlet pipe section.

[0008] The beneficial effect of adopting the above further scheme is: by setting a partition in the flue gas inlet pipe, the existing pipeline at the top 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 installed on the second smoke inlet pipe section and the smoke exhaust pipe, one of the second smoke inlet pipe section and the smoke exhaust pipe is connected to the raw smoke side of the heat exchanger, and the other is connected to the clean smoke 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 after denitrification to heat the flue gas entering the de-CO reaction tower, which can reduce the consumption of coal gas.

[0011] Furthermore, the heat exchanger is installed on the second flue gas inlet pipe section upstream of the flue gas inlet pipe to be deCOed.

[0012] Furthermore, an imported online CO analyzer is installed on the flue gas input pipe to be de-COed.

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

[0014] Furthermore, an outlet online CO analyzer is installed on the flue gas exhaust pipe.

[0015] 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 denitrification reaction tower.

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

[0017] The beneficial effect of adopting the above further scheme is that only CO catalyst filler is filled in the CO removal reaction tower to remove CO from the NOx flue gas.

[0018] 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.

[0019] Furthermore, multiple layers of denitration catalyst packing layers are arranged in the denitration reaction tower.

[0020] The beneficial effect of adopting the above further scheme is that the denitration reaction tower is filled with denitration catalyst to remove NOx. The entire equipment process not only ensures the denitration efficiency, but also achieves the purpose of removing CO.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the structure of a device for removing CO before spraying ammonia in sintering flue gas denitrification according to the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Denitration reaction tower; 2. DeCO reaction tower; 3. Flue gas inlet pipe to be deCOed; 4. DeCO flue gas outlet pipe; 5. First flue gas inlet pipe section; 6. Flue gas outlet pipe; 7. Chimney; 8. Partition; 9. Second flue gas inlet pipe section; 10. Heat exchanger; 11. Imported online CO analyzer; 12. Exported online CO analyzer; 13. CO catalyst packing layer; 14. First rake soot blower; 15. DeNOx catalyst packing layer; 16. Second rake soot blower. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1 As shown, a device for removing CO from sintering flue gas before spraying ammonia for denitrification of sintering flue gas in this embodiment comprises a denitrification reaction tower 1 and a de-CO reaction tower 2, wherein the de-CO reaction tower 2 is located outside the denitrification reaction tower 1; a flue gas input pipe 3 to be de-CO is connected to the top of the de-CO reaction tower 2, a de-CO flue gas exhaust pipe 4 is connected to the bottom of the de-CO reaction tower 2, the de-CO flue gas exhaust pipe 4 is connected and communicated with the flue gas inlet pipe at the top of the denitrification reaction tower 1, and the flue gas exhaust pipe 6 at the bottom of the denitrification reaction tower 1 is connected to a chimney 7.

[0027] like Figure 1 As shown, a partition 8 is provided in the flue gas inlet pipe of this embodiment, and the partition 8 divides the flue gas inlet pipe into a first flue gas inlet pipe section 5 and a second flue gas inlet pipe section 9 which are independent and not connected to each other. The first flue gas inlet pipe section 5 is connected to the top of the denitration reaction tower 1, and the second flue gas inlet pipe section 9 is used to introduce desulfurized flue gas; the de-CO flue gas discharge pipe 4 is connected to the first flue gas inlet pipe section 5, and the flue gas input pipe 3 to be de-CO is connected to the second flue gas inlet pipe section 9. The partition can also be replaced by a baffle door; by setting a partition in the flue gas inlet pipe, the pipeline originally existing at the top of the denitration reaction tower can be used, and no additional pipeline needs to be set, which saves pipelines, has a compact structure, and is convenient for connection.

[0028] like Figure 1 As shown, a preferred solution of this embodiment is that a heat exchanger 10 is installed on the second flue gas inlet pipe section 9 and the flue gas outlet pipe 6, one of the second flue gas inlet pipe section 9 and the flue gas outlet pipe 6 is connected to the original flue gas side of the heat exchanger 10, and the other is connected to the clean flue gas side of the heat exchanger 10. The heat exchanger 10 is a GGH heat exchanger. The setting of the heat exchanger can utilize the heat of the flue gas after denitration to heat the flue gas entering the de-CO reaction tower, which can reduce the amount of coal gas used.

[0029] Further, such as Figure 1 As shown, the heat exchanger 10 is installed on the second flue gas inlet pipe section 9 upstream of the flue gas inlet pipe 3 to be de-COed.

[0030] like Figure 1 As shown, the flue gas input pipe 3 to be de-COed in this embodiment is equipped with an imported online CO analyzer 11. The flue gas before entering the de-COed reaction tower can be subjected to online CO detection and analysis.

[0031] like Figure 1 As shown, the flue gas exhaust pipe 6 of this embodiment is equipped with an outlet online CO analyzer 12. The flue gas passing through the denitration reaction tower can be subjected to online CO detection and analysis.

[0032] like Figure 1 As shown, the CO removal reaction tower 2 of this embodiment is provided with a CO catalyst packing layer 13. The CO catalyst packing layer 13 is filled with a honeycomb catalyst packing for removing CO. Only CO catalyst packing is filled in the CO removal reaction tower for removing CO from the nitrate flue gas.

[0033] like Figure 1 As shown, the CO removal reaction tower 2 of this embodiment is equipped with a first rake soot blower 14 using compressed air or inert gas as a purge medium. The first rake soot blower 14 is located above the CO catalyst packing layer 13 .

[0034] like Figure 1 As shown, the denitration reaction tower 1 of this embodiment is provided with multiple layers of denitration catalyst filler layers 15. The denitration reaction tower is filled with denitration catalyst to remove NOx. The entire equipment process flow not only ensures the denitration efficiency, but also achieves the purpose of removing CO. There is no reserved layer in the denitration reaction tower, and other new catalyst fillers cannot be loaded.

[0035] like Figure 1 As shown, the denitration reaction tower 1 of this embodiment is equipped with a plurality of second rake soot blowers 16 using compressed air or inert gas as a purge medium, and one of the second rake soot blowers 16 is arranged above each denitration catalyst packing layer 15 .

[0036] The first rake soot blower 14 and the second rake soot blower 16 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.

[0037] The process of a device for removing CO from sintering flue gas before spraying ammonia for denitrification of the present embodiment is as follows: the flue gas after desulfurization is heat exchanged with the flue gas discharged from the denitrification reaction tower through a heat exchanger and supplemented with heat by a heat supplement system, and then enters the de-CO reaction tower through a flue gas input pipe to be de-CO; before entering the de-CO reaction tower, an online CO analysis is performed on the imported online CO analyzer; the flue gas from which CO is removed enters the denitrification reaction tower through a de-CO flue gas exhaust pipe and a first flue gas inlet pipe section; the flue gas in the denitrification reaction tower is denitrified, and then heat exchanged through a heat exchanger, and then discharged through a chimney; before being discharged through the chimney, an online CO analysis is performed on the exported online CO analyzer.

[0038] The device of this embodiment for removing CO from sintering flue gas before spraying ammonia for denitrification can remove CO before spraying ammonia for denitrification, reduce the influence of ammonia on the CO catalyst, improve the efficiency of CO removal, and thus allow more CO to be catalytically burned, saving more coal gas (for example: blast furnace gas, converter gas, coke oven gas, etc.).

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 from sintering flue gas before spraying ammonia for denitrification, characterized in that: It comprises a denitration reaction tower and a de-CO reaction tower, wherein the de-CO reaction tower is located outside the denitration reaction tower; the top of the de-CO reaction tower is connected with a flue gas input pipe to be de-CO, the bottom of the de-CO reaction tower is connected with a de-CO flue gas exhaust pipe, the de-CO flue gas exhaust pipe is connected and communicated with the flue gas inlet pipe at the top of the denitration reaction tower, and the flue gas exhaust pipe at the bottom of the denitration reaction tower is connected to a chimney.

2. The device for removing CO from sintering flue gas before spraying ammonia for denitrification according to claim 1 is characterized in that: A partition is provided in the flue gas inlet pipe, and the partition divides the flue gas inlet pipe into a first flue gas inlet pipe section and a second flue gas inlet pipe section which are independent and not connected to each other. The first flue gas inlet pipe section is connected to the top of the denitrification reaction tower, and the second flue gas inlet pipe section is used to introduce desulfurized flue gas; the de-CO flue gas exhaust pipe is connected to the first flue gas inlet pipe section, and the flue gas input pipe to be de-CO is connected to the second flue gas inlet pipe section.

3. The device for removing CO from sintering flue gas before spraying ammonia for denitrification according to claim 2, characterized in that: A heat exchanger is installed on the second smoke inlet pipe section and the smoke exhaust pipe. One of the second smoke inlet pipe section and the smoke exhaust pipe is connected to the raw smoke side of the heat exchanger, and the other is connected to the clean smoke side of the heat exchanger.

4. The device for removing CO from sintering flue gas before spraying ammonia for denitrification according to claim 3 is characterized in that: The heat exchanger is installed on the second flue gas inlet pipe section upstream of the flue gas inlet pipe to be de-COed.

5. The device for removing CO from sintering flue gas before injecting ammonia for denitrification according to any one of claims 1 to 4, characterized in that: An imported online CO analyzer is installed on the flue gas input pipe to be de-COed.

6. The device for removing CO from sintering flue gas before injecting ammonia for denitrification according to any one of claims 1 to 4, characterized in that: An outlet online CO analyzer is installed on the flue gas exhaust pipe.

7. The device for removing CO from sintering flue gas before injecting ammonia for denitrification 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 from sintering flue gas before spraying ammonia for denitrification according to claim 7, 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 from sintering flue gas before injecting ammonia for denitrification 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 from sintering flue gas before spraying ammonia for denitrification 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.

Images