On-line regeneration sintering flue gas CO removal system

Abstract

The utility model discloses an online regeneration sintering flue gas CO removal system. The system comprises a CO reactor, a zoning flow guide device and a CO catalyst layer are arranged in the CO reactor, the CO catalyst layer is arranged above the zoning flow guide device, the zoning flow guide device comprises a plurality of independent flow guide channels, each flow guide channel is provided with a regeneration burner and communicated with a gas pipeline, and the regeneration burner is communicated with the gas pipeline. A heating combustor is arranged below the CO reactor and communicated with a gas pipeline, a flue at the top end of the CO reactor is connected with a combustion-supporting air pipeline, a pipeline is connected to the combustion-supporting air pipeline to a combustion-supporting fan, and an outlet of the combustion-supporting fan is provided with a plurality of pipelines which are communicated with the regeneration combustors and the heating combustor respectively. According to the method, the combustor is used for heating part of the flue gas in a partitioned mode to enable the flue gas to reach the CO catalyst regeneration temperature, low-energy-consumption CO catalyst online regeneration is achieved, meanwhile, the influence on the overall flue gas temperature is small, and good economical efficiency is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sintering flue gas treatment in the steel industry, and in particular relates to an online regenerative sintering flue gas CO removal system. Background Art

[0002] The emission of air pollutants generated by the sintering process ranks first among all processes in steel production. This process will produce a large amount of dust particles, SO2, NOx, CO and other air pollutants.

[0003] At present, most steel enterprises have achieved ultra-low emission standards through technical means such as dust removal, desulfurization, and denitrification. The emission of CO in flue gas has also gradually attracted attention. The purification of CO in sintering flue gas generally starts with terminal treatment, using catalysts to catalytically oxidize and remove CO. However, the temperature of sintering flue gas is relatively low, and pollutants such as SO2 and dust in the flue gas can easily deactivate the catalyst. High-temperature regeneration can restore the activity of the catalyst to a certain extent and extend its service life. However, while high-temperature regeneration restores the activity of the catalyst, it will also increase the overall temperature of the CO removal system, resulting in heat waste and affecting the use of subsequent equipment. Utility Model Content

[0004] In view of the above situation, the purpose of the utility model is to provide an online regeneration sintering flue gas CO removal system.

[0005] The specific technical solutions are as follows:

[0006] An online regeneration sintering flue gas CO removal system comprises a CO reactor. A sub-regional flow guide device and a CO catalyst layer are arranged in the CO reactor. The CO catalyst layer is arranged above the sub-regional flow guide device. The sub-regional flow guide device comprises a plurality of independent flow guide channels. Each flow guide channel is respectively provided with a regeneration burner and is connected to a corresponding gas pipeline. A heating burner is arranged below the CO reactor and is connected to the gas pipeline. A combustion-supporting air pipeline is led out from the top flue of the CO reactor.

[0007] Furthermore, the lower end surface of the CO catalyst layer is in contact with the upper end surface of the regional flow guiding device.

[0008] Furthermore, a front spoiler is provided inside the lower part of the CO reactor, and a rear spoiler is provided above the CO catalyst layer.

[0009] Furthermore, a combustion-supporting fan is provided on the combustion-supporting air duct, and multiple pipelines are provided at the combustion-supporting fan outlet to respectively connect multiple regeneration burners and heating burners, and an isolation valve for switching is provided on the pipeline to provide heating combustion-supporting air to the regeneration burner and the heating burner.

[0010] Furthermore, the regional flow guide device is divided into 2 columns and 3-6 rows of square independent flue gas channels, and the regeneration burner extends into each independent flue gas channel.

[0011] The high-temperature flue gas enters the CO reactor. After passing through the regional guide device, the flue gas passes through the CO catalyst layer, which removes CO from the flue gas. The flue gas is then discharged from the top flue into the next device.

[0012] When the CO catalyst layer needs to be regenerated, the valves of each regeneration burner and its corresponding gas pipeline and combustion-supporting air pipeline are opened in turn. The gas is burned through the regeneration burner to heat the flue gas in the guide channel where the regeneration burner is located to 400-600℃, so that the high-temperature flue gas enters the corresponding CO catalyst layer area, and the high-temperature regeneration of the catalyst in each area is carried out to restore the activity of the catalyst. After passing through the catalyst layer, the high-temperature flue gas is mixed with the flue gas in other guide channels that are not opened for regeneration, so that the flue gas temperature returns to the normal operating range, and then enters the combustion-supporting air pipeline through the top flue. Part of the flue gas enters the running regeneration burner as combustion-supporting gas, and the rest of the flue gas is transported to the next equipment. The heating burner is only used as supplementary heat when the flue gas temperature is lower than 200℃ when the sintering machine is started and the flue gas temperature cannot reach the catalyst ignition temperature. It is not used when the system is operating normally.

[0013] The beneficial effects of the utility model are:

[0014] The utility model utilizes a burner to heat the flue gas in different zones to make it reach the CO catalyst regeneration temperature, which will not have a great impact on the temperature of the entire system. While achieving low-energy consumption CO catalyst online regeneration, it has little impact on the overall flue gas temperature and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the process system and implementation method of the utility model.

[0016] Figure 2 It is a cross-sectional view of the flow guide device of the present utility model.

[0017] In the figure: 1-CO reactor; 2-regional flow guide device; 21-flow guide channel; 3-CO catalyst layer; 4-regeneration burner; 5-heating burner; 6-gas pipeline; 7-flue; 8-combustion-supporting air pipeline; 9-front spoiler device; 10-rear spoiler device; 11-combustion-supporting fan. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0019] like Figure 1 As shown, an online regeneration system for removing CO from sintering flue gas uses a burner to heat the flue gas in different zones to regenerate the CO catalyst in the corresponding zones, thereby achieving low-energy online regeneration of the CO catalyst while having little impact on the overall flue gas temperature. The system includes a CO reactor 1, a zoned flow guide device 2, a CO catalyst layer 3, a regeneration burner 4, a temperature-raising burner 5, a gas pipeline 6, a flue 7, a combustion-supporting air pipeline 8, a front spoiler device 9, a rear spoiler device 10 and a combustion-supporting fan 11. The CO reactor 1 is provided with a zoned flow guide device 2 and a CO catalyst layer 3. The flue gas flow velocity in the CO reactor 1 is 2 to 10 m / s. The CO catalyst layer 3 is provided above the zoned flow guide device 2, and the lower end surface of the CO catalyst layer 3 is in contact with the upper end surface of the zoned flow guide device 2, as shown in FIG. Figure 2 As shown, the regional flow guide device 2 includes a plurality of independent flow guide channels 21, which are generally divided into 2 columns and 3-6 rows of square independent flue gas channels. Each flow guide channel 21 is provided with a regeneration burner 4 and connected to the corresponding gas pipeline 6. The flue gas temperature can be heated to 400-600°C by burning the gas, so as to regenerate the CO catalyst layer 3 at the rear of the region. A heating burner 5 is provided below the CO reactor 1 and connected to the gas pipeline 6. A combustion-supporting air duct 8 is led out from the top flue 7 of the CO reactor 1. A combustion-supporting fan 11 is provided on the combustion-supporting air duct 8. The outlet pipes of the combustion-supporting fan 11 are respectively connected to a plurality of regeneration burners 4 and heating burners 5, and heating-supporting gas is provided to the regeneration burners 4 and heating burners 5. A front spoiler 9 is provided inside the lower part of the CO reactor 1, and a rear spoiler 10 is provided above the CO catalyst layer 3. The gas required by the regenerative burner 4 is input from the outside through the gas pipeline 6, and the required combustion-supporting air is input through the combustion-supporting air pipeline 8 by extracting part of the flue gas from the tail flue 7 of the CO removal system by the combustion-supporting fan 11.

[0020] The high-temperature flue gas enters the CO reactor 1. After passing through the regional guide device 2, the flue gas passes through the CO catalyst layer 3. The CO catalyst layer 3 removes CO from the flue gas, and then discharges it from the top flue 7 to the next device. When the CO catalyst layer 3 needs to be regenerated, the valves of each regeneration burner 4 and its corresponding gas pipeline 6 and combustion-supporting air pipeline 8 are opened in turn. The gas is burned by the regeneration burner 4, and the flue gas in the guide channel where the regeneration burner 4 is located is heated to 400-600°C, so that the high-temperature flue gas enters the corresponding CO catalyst layer 3 area, and the high-temperature regeneration of the regional catalyst is carried out to restore the activity of the catalyst. After passing through the catalyst layer 3, the high-temperature flue gas is mixed with the flue gas in the other guide channel 21 that has not been opened for regeneration, so that the flue gas temperature returns to the normal operating range, and then enters the combustion-supporting air pipeline 8 through the top flue 7. Part of the flue gas enters the running regeneration burner 4 as a combustion-supporting gas, and the rest of the flue gas is transported to the next device. The temperature-raising burner 5 is used to raise the overall temperature of the flue gas when the flue gas temperature does not reach the ignition temperature of the CO catalyst layer 3, generally raising the flue gas temperature to above 200°C. The gas required by the temperature-raising burner 5 is input from the outside through the gas pipeline 6, and the required combustion-supporting air is drawn from the tail flue 7 of the CO removal system by the combustion-supporting fan 11 and input through the combustion-supporting air pipeline 8. A front spoiler 9 is installed in front of the temperature-raising burner 5 to make the flue gas temperature field uniform.

Claims

1. An online regeneration sintering flue gas CO removal system, characterized in that: The invention comprises a CO reactor (1), wherein a sub-regional flow guide device (2) and a CO catalyst layer (3) are provided in the CO reactor (1), wherein the CO catalyst layer (3) is arranged above the sub-regional flow guide device (2), wherein the sub-regional flow guide device (2) comprises a plurality of independent flow guide channels (21), wherein each flow guide channel (21) is provided with a regeneration burner (4) and is connected to a corresponding gas pipeline (6), wherein a heating burner (5) is provided below the CO reactor (1) and is connected to the gas pipeline (6), and a combustion-supporting air pipeline (8) is led out from a top flue (7) of the CO reactor (1).

2. The on-line regeneration sintering flue gas CO removal system according to claim 1 is characterized in that: The lower end surface of the CO catalyst layer (3) is in contact with the upper end surface of the regional flow guiding device (2).

3. The online regeneration sintering flue gas CO removal system according to claim 1 is characterized in that: A front spoiler (9) is provided inside the lower part of the CO reactor (1), and a rear spoiler (10) is provided above the CO catalyst layer (3).

4. The online regeneration sintering flue gas CO removal system according to claim 1 is characterized in that: A combustion-supporting air duct (8) is provided with a combustion-supporting air fan (11), and a plurality of pipelines are provided at the outlet of the combustion-supporting air fan (11) respectively connected to a plurality of regeneration burners (4) and a heating burner (5), and an isolation valve for switching is provided on the pipeline.

5. The online regeneration sintering flue gas CO removal system according to claim 1 is characterized in that: The regional flow guide device (2) is divided into 2 columns and 3 to 6 rows of square independent flue gas channels, and the regeneration burner (4) extends into each independent flue gas channel.

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