Flue gas desulfurization and denitrification device integrated with CO removal function

Abstract

The utility model provides a flue gas desulfurization and denitrification device integrating a CO removal function, which comprises a soot desulfurization and denitrification device, an air flue desulfurization and denitrification device and an afterburning hot blast stove, a CO removal catalyst is arranged in the soot desulfurization and denitrification device, and the afterburning hot blast stove is respectively connected with the soot desulfurization and denitrification device and the air flue desulfurization and denitrification device. The CO removal catalyst is placed on the catalyst vacant layer on the upper layer of the denitration reactor for SCR denitration treatment, and is used in cooperation with a flue gas desulfurization and denitration technology, so that CO in flue gas can be removed, the characteristic of heat release of CO catalytic reaction is utilized, the gas consumption of the afterburning furnace is greatly reduced, the flue gas denitration operation cost is reduced, and collaborative emission reduction of multiple pollutants such as CO and NOx is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas CO removal, in particular to a flue gas desulfurization and denitrification device with integrated CO removal function. Background Art

[0002] The flue gas emitted into the atmosphere by steel rolling heating furnaces every year contains a large amount of industrial flue gas with CO. The existing flue gas from steel rolling heating furnaces is divided into air flue gas and coal smoke, and both air flue gas and coal smoke are equipped with flue gas desulfurization and denitrification treatment systems.

[0003] However, flue gas desulfurization and denitrification need to reach a certain operating temperature. Since coal smoke contains CO, it cannot be directly heated, so a heat exchanger is needed for heat exchange, and a supplementary combustion furnace is needed for heat exchange, which wastes a lot of energy. The catalytic reaction of CO can release heat, which can be used to heat the flue gas, but the existing coal smoke and flue gas treatment system of the steel rolling heating furnace does not have a system for treating CO. Utility Model Content

[0004] The utility model aims to provide a flue gas desulfurization and denitrification device with integrated CO removal function, which can not only remove CO in flue gas, but also utilize the heat release characteristic of CO catalytic reaction, greatly reduce the gas consumption of the supplementary combustion furnace, and reduce the operating cost of flue gas denitrification.

[0005] According to the purpose of the utility model, the utility model provides a flue gas desulfurization and denitrification device with integrated CO removal function, including a coal smoke desulfurization and denitrification device, an air smoke desulfurization and denitrification device and a supplementary hot air furnace, wherein the coal smoke desulfurization and denitrification device is provided with a CO removal catalyst, and the supplementary hot air furnace is respectively connected to the coal smoke desulfurization and denitrification device and the air smoke desulfurization and denitrification device.

[0006] Furthermore, the coal smoke desulfurization and denitrification device includes a coal smoke desulfurization reactor, a coal smoke dust collector, a coal smoke primary heat exchanger, a coal smoke secondary heat exchanger and a coal smoke denitrification reactor, the outlet of the coal smoke desulfurization reactor is connected to the coal smoke dust collector, the outlet end of the coal smoke dust collector is connected to the cold source inlet of the coal smoke primary heat exchanger, the cold source outlet of the coal smoke primary heat exchanger is connected to the cold source inlet connected to the coal smoke secondary heat exchanger, the cold source outlet of the coal smoke secondary heat exchanger is connected to the inlet of the coal smoke denitrification reactor, and the outlet of the coal smoke denitrification reactor is connected to the heat source inlet of the coal smoke primary heat exchanger.

[0007] Furthermore, the air smoke desulfurization and denitrification device includes an air smoke desulfurization reactor, an air smoke dust collector, an air smoke heat exchanger and an air smoke denitrification reactor, the outlet of the air smoke desulfurization reactor is connected to the air smoke dust collector, the outlet end of the air smoke dust collector is connected to the cold source inlet of the air smoke heat exchanger, the cold source outlet of the air smoke heat exchanger is connected to the inlet of the air smoke denitrification reactor, and the outlet of the air smoke denitrification reactor is connected to the heat source inlet of the air smoke heat exchanger.

[0008] Furthermore, the coal smoke denitration reactor and the air smoke denitration reactor are both provided with denitration catalysts, and the top layer of the coal smoke denitration reactor is also provided with the de-CO catalyst.

[0009] Furthermore, the coal smoke desulfurization reactor is connected to the coal smoke flue gas pipeline, and the air smoke desulfurization reactor is connected to the air smoke flue gas pipeline.

[0010] Furthermore, the coal smoke desulfurization reactor and the air smoke desulfurization reactor both include a desulfurization reactor body, the desulfurization reactor body is cylindrical, a spoiler is provided inside the desulfurization reactor body, and a plurality of desulfurizer injection points are provided at the front end of the spoiler.

[0011] Furthermore, the heat source outlet of the coal smoke primary heat exchanger is connected to the coal smoke induced draft fan, the coal smoke induced draft fan is connected to the coal smoke chimney, and the heat source outlet of the air smoke heat exchanger is connected to the air smoke induced draft fan, the air smoke induced draft fan is connected to the air smoke chimney.

[0012] Furthermore, the coal smoke denitration reactor and the air smoke denitration reactor are provided with a three-layer structure inside, and the top layer of the coal smoke denitration reactor is provided with the CO removal catalyst.

[0013] Furthermore, a part of the hot air coming out of the supplementary combustion hot blast furnace is connected to the heat source inlet of the coal smoke secondary heat exchanger, and the heat source outlet of the coal smoke secondary heat exchanger is connected to the air smoke denitrification reactor; another part of the hot air coming out of the supplementary combustion hot blast furnace is connected to the air smoke heat exchanger.

[0014] Furthermore, a valve is provided on the pipeline between the supplementary combustion hot blast furnace and the coal smoke secondary heat exchanger.

[0015] The utility model technical scheme places a de-CO catalyst in the catalyst vacant layer on the upper layer of the de-NOx reactor for SCR de-NOx treatment, and is used in conjunction with the flue gas desulfurization and de-NOx technology, which can not only remove CO from the flue gas, but also utilize the heat release characteristics of the CO catalytic reaction, greatly reduce the gas consumption of the supplementary combustion furnace, reduce the operating cost of flue gas de-NOx, and achieve CO and NO x Coordinated emission reduction of multiple pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the operating state structure of the embodiment of the utility model when it is running alone;

[0018] Figure 2 This is a schematic diagram of the operating state structure of the hot air pipeline of the embodiment of the utility model when it is opened;

[0019] In the figure: 1. coal smoke desulfurization reactor; 2. coal smoke dust collector; 3. supplementary combustion hot air furnace; 4. coal smoke primary heat exchanger; 5. coal smoke secondary heat exchanger; 6. coal smoke denitrification reactor; 7. coal smoke induced draft fan; 8. coal smoke chimney; 9. air smoke desulfurization reactor; 10. air smoke dust collector; 11. air smoke heat exchanger; 12. air smoke denitrification reactor; 13. air smoke induced draft fan; 14. air smoke chimney. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] 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" and the like indicating directions or positional relationships are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown,

[0025] A flue gas desulfurization and denitration device with integrated CO removal function comprises a coal smoke desulfurization and denitration device, an air smoke desulfurization and denitration device and a supplementary combustion hot air furnace 3.

[0026] The coal smoke desulfurization and denitrification device comprises a coal smoke desulfurization reactor 1, a coal smoke dust collector 2, a coal smoke primary heat exchanger 4, a coal smoke secondary heat exchanger 5 and a coal smoke denitrification reactor 6.

[0027] The soot desulfurization reactor 1 is connected to the soot flue gas pipeline, and is used to receive the soot flue gas and desulfurize the soot flue gas. The soot desulfurization reactor 1 includes a desulfurization reactor body, which is cylindrical, and a spoiler is arranged in the desulfurization reactor body, and the spoiler is arranged in two layers, and a plurality of desulfurizer injection points are arranged at the front end of the spoiler, and the number of the injection points is 3-5.

[0028] The outlet of the soot desulfurization reactor 1 is connected to the soot dust collector 2. The soot flue gas after desulfurization enters the soot dust collector 2 for dust removal. The outlet of the soot dust collector 2 is connected to the cold source inlet of the soot primary heat exchanger 4.

[0029] The cold source outlet of the primary soot heat exchanger 4 is connected to the cold source inlet of the secondary soot heat exchanger 5, the cold source outlet of the secondary soot heat exchanger 5 is connected to the inlet of the soot denitration reactor 6, the soot denitration reactor 6 denitrates the soot flue gas, the outlet of the soot denitration reactor 6 is connected to the heat source inlet of the primary soot heat exchanger 4, the heat source outlet of the primary soot heat exchanger 4 is connected to the soot induced draft fan 7 through a pipeline, and the soot induced draft fan 7 is connected to the soot chimney 8 through a pipeline.

[0030] In this embodiment, the coal smoke denitration reactor 6 is used to perform denitration and deCO operations on the flue gas. Specifically, a three-layer structure is provided in the coal smoke denitration reactor 6, wherein the top layer of the coal smoke denitration reactor 6 is provided with a deCO catalyst, which is a corrugated plate catalyst module. Denitration catalysts are placed in the lower two layers of the coal smoke denitration reactor 6, which are honeycomb catalyst modules. The coal smoke denitration reactor 6 of this embodiment is used to perform deCO and deNOx reactions on the coal smoke after heating by providing a deCO catalyst and a denitration catalyst.

[0031] The flue gas after the reaction is completed enters from the heat source inlet of the coal smoke primary heat exchanger 4, thereby exchanging heat with the flue gas entering from the cold end of the coal smoke primary heat exchanger 4 through the coal smoke primary heat exchanger 4. The flue gas after heat exchange is introduced into the coal smoke chimney 8 through the coal smoke induced draft fan 7 for discharge.

[0032] The air smoke desulfurization and denitrification device comprises an air smoke desulfurization reactor 9 , an air smoke dust collector 10 , an air smoke heat exchanger 11 and an air smoke denitrification reactor 12 .

[0033] The air-to-gas desulfurization reactor 9 is connected to the air-to-gas flue gas pipeline, and is used to receive the air-to-gas flue gas and desulfurize the air-to-gas flue gas. The air-to-gas desulfurization reactor 9 includes a desulfurization reactor body, which is cylindrical, and a spoiler is arranged in the desulfurization reactor body, and the spoiler is arranged in two layers, and a plurality of desulfurizer injection points are arranged at the front end of the spoiler, and the number of the injection points is 3-5.

[0034] The outlet of the air smoke desulfurization reactor 9 is connected to the air smoke dust collector 10, and the air smoke after desulfurization enters the air smoke dust collector 10 for dust removal. The outlet end of the air smoke dust collector 10 is connected to the cold source inlet of the air smoke heat exchanger 11, and the cold source outlet of the air smoke heat exchanger 11 is connected to the inlet of the air smoke denitrification reactor 12. The air smoke denitrification reactor 12 denitrates the air smoke gas. The outlet of the air smoke denitrification reactor 12 is connected to the heat source inlet of the air smoke heat exchanger 11, and the heat source outlet of the air smoke heat exchanger 11 is connected to the air smoke induced draft fan 13 through a pipeline, and the air smoke induced draft fan 13 is connected to the air smoke chimney 14 through a pipeline.

[0035] In this embodiment, the air smoke denitration reactor 12 is used to perform a denitration operation on the flue gas. Specifically, a three-layer structure is provided in the air smoke denitration reactor 12. A denitration catalyst is placed in the air smoke denitration reactor 12. The denitration catalyst is a honeycomb catalyst module. In this embodiment, the air smoke denitration reactor 12 is provided with a denitration catalyst to perform a deNOx reaction on the air smoke after the temperature is increased.

[0036] The flue gas after the reaction is completed enters from the heat source inlet of the air-smoke heat exchanger 11, thereby exchanging heat with the flue gas at the cold end of the air-smoke heat exchanger 11 through the air-smoke heat exchanger 11. The flue gas after heat exchange is introduced into the air-smoke chimney 14 through the air-smoke induced draft fan 13 for discharge.

[0037] The supplementary combustion hot blast furnace 3 is used for supplementary combustion of the coal smoke secondary heat exchanger 5 and the air smoke flue gas. Specifically, a part of the hot air coming out of the supplementary combustion hot blast furnace 3 is connected to the heat source inlet of the coal smoke secondary heat exchanger 5, and then enters the air smoke denitrification reactor 12 from the heat source outlet of the coal smoke secondary heat exchanger 5; the other part of the hot air coming out of the supplementary combustion hot blast furnace 3 is also connected to the air smoke denitrification reactor 12.

[0038] When the temperature of the flue gas raised by the catalytic reaction of CO removal can meet the temperature for NOx removal, the high-temperature flue gas generated by the supplementary hot blast furnace 3 leading to the secondary heat exchanger 5 of the coal smoke is closed, and the coal smoke coming out of the outlet end of the coal smoke dust collector 2 can directly reach the reaction temperature of the coal smoke SCR denitrification reaction device through the heat exchanger 4. It is only necessary to supplement the air smoke through the supplementary hot blast furnace 3, which can reduce the gas consumption of the supplementary furnace.

[0039] It can be understood that a valve is provided on the pipeline between the supplementary combustion hot blast furnace 3 and the coal smoke secondary heat exchanger 5, and the valve is used to control whether the supplementary combustion hot blast furnace 3 supplements the coal smoke. In addition, the present embodiment can set a temperature sensor at the outlet of the coal smoke denitrification reactor 6 to detect the temperature of the exhaust gas after the denitrification reactor reaction in real time, so as to better determine whether to stop the supplementary combustion hot blast furnace 3 from supplementing the coal smoke. Only when the temperature reaches the requirement, the valve for the supplementary combustion hot blast furnace 3 to supplement the coal smoke is closed; at the same time, the supplementary combustion hot blast furnace 3 is reduced, thereby saving fuel.

[0040] When the temperature drops, it is necessary to open the valve of the supplementary combustion hot blast furnace 3 to supplement the coal smoke, and simultaneously increase the size of the supplementary combustion hot blast furnace 3 until the temperature of the coal smoke desulfurization and denitrification device rises, and then close the valve of the supplementary combustion hot blast furnace 3 to supplement the coal smoke.

[0041] The utility model can remove CO in the flue gas and utilize the heat release characteristic of CO catalytic reaction, thereby reducing the gas volume of the supplementary combustion furnace, saving energy, and reducing the burden of subsequent air-to-gas NOx removal.

[0042] (Because the supplementary combustion furnace usually produces high-temperature flue gas by burning blast furnace gas, converter gas or coke oven gas, the flue gas contains NOx. The high-temperature flue gas after heat exchange with the coal smoke flue gas needs to be de-NOxed before entering the air flue gas denitrification).

[0043] The utility model proposes a CO terminal treatment system, which combines the existing flue gas treatment of the steel rolling heating furnace, places a CO removal catalyst in the catalyst vacant layer on the upper layer of the denitration reactor of the SCR denitration treatment, and is used in conjunction with the flue gas desulfurization and denitration technology. It has the advantages of low investment cost, no additional operating energy consumption and secondary pollution, significant emission reduction effect, etc., and is feasible for industrial practice.

[0044] The utility model places the CO removal catalyst on the top layer, because CO is converted into CO by catalytic reaction. 2 It is an exothermic reaction. Setting the CO catalytic denitrification reactor in an empty position can increase the flue gas temperature by 30-50°C, significantly reduce the gas consumption of the supplementary combustion furnace, and reduce the operating cost of flue gas denitrification. At the same time, it can also achieve CO emission standards and achieve the coordinated reduction of multiple pollutants such as CO and NOx. Without making large-scale modifications to the existing steel rolling heating furnace treatment system, the CO in the coal smoke flue gas of the steel rolling heating furnace is removed.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A flue gas desulfurization and denitrification device with integrated CO removal function, characterized in that: It comprises a coal smoke desulfurization and denitrification device, an air smoke desulfurization and denitrification device and a supplementary combustion hot blast furnace. The coal smoke desulfurization and denitrification device is provided with a CO removal catalyst, and the supplementary combustion hot blast furnace is respectively connected to the coal smoke desulfurization and denitrification device and the air smoke desulfurization and denitrification device.

2. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 1 is characterized in that: The coal smoke desulfurization and denitrification device includes a coal smoke desulfurization reactor, a coal smoke dust collector, a coal smoke primary heat exchanger, a coal smoke secondary heat exchanger and a coal smoke denitrification reactor. The outlet of the coal smoke desulfurization reactor is connected to the coal smoke dust collector, the outlet end of the coal smoke dust collector is connected to the cold source inlet of the coal smoke primary heat exchanger, the cold source outlet of the coal smoke primary heat exchanger is connected to the cold source inlet connected to the coal smoke secondary heat exchanger, the cold source outlet of the coal smoke secondary heat exchanger is connected to the inlet of the coal smoke denitrification reactor, and the outlet of the coal smoke denitrification reactor is connected to the heat source inlet of the coal smoke primary heat exchanger.

3. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 2 is characterized in that: The air smoke desulfurization and denitrification device comprises an air smoke desulfurization reactor, an air smoke dust collector, an air smoke heat exchanger and an air smoke denitrification reactor. The outlet of the air smoke desulfurization reactor is connected to the air smoke dust collector, the outlet end of the air smoke dust collector is connected to the cold source inlet of the air smoke heat exchanger, the cold source outlet of the air smoke heat exchanger is connected to the inlet of the air smoke denitrification reactor, and the outlet of the air smoke denitrification reactor is connected to the heat source inlet of the air smoke heat exchanger.

4. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3 is characterized in that: The coal smoke denitration reactor and the air smoke denitration reactor are both provided with denitration catalysts, and the top layer of the coal smoke denitration reactor is also provided with the de-CO catalyst.

5. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3 is characterized in that: The coal smoke desulfurization reactor is connected to the coal smoke flue gas pipeline, and the air smoke desulfurization reactor is connected to the air smoke flue gas pipeline.

6. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3, characterized in that: The soot desulfurization reactor and the air smoke desulfurization reactor both include a desulfurization reactor body, which is cylindrical. A spoiler is arranged inside the desulfurization reactor body, and a plurality of desulfurizer injection points are arranged at the front end of the spoiler.

7. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3, characterized in that: The heat source outlet of the coal smoke primary heat exchanger is connected to the coal smoke induced draft fan, the coal smoke induced draft fan is connected to the coal smoke chimney, the heat source outlet of the air smoke heat exchanger is connected to the air smoke induced draft fan, the air smoke induced draft fan is connected to the air smoke chimney.

8. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3, characterized in that: The soot denitration reactor and the air smoke denitration reactor are provided with a three-layer structure inside, and the de-CO catalyst is provided on the top layer of the soot denitration reactor.

9. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3, characterized in that: A part of the hot air coming out of the supplementary combustion hot air furnace is connected to the heat source inlet of the coal smoke secondary heat exchanger, and the heat source outlet of the coal smoke secondary heat exchanger is connected to the air smoke denitrification reactor; another part of the hot air coming out of the supplementary combustion hot air furnace is connected to the air smoke heat exchanger.

10. The flue gas desulfurization and denitrification device with integrated CO removal function according to claim 3, characterized in that: A valve is arranged on the pipeline between the supplementary combustion hot blast furnace and the coal smoke secondary heat exchanger.

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