Radial tower and capture process for blast furnace gas carbon capture with high flux and low energy consumption

Abstract

The application discloses a high-flux and low-energy-consumption radial tower for blast furnace gas carbon capture and a capture process, and belongs to the technical field of gas separation and energy saving. The radial tower comprises an outer cylinder, an inner cylinder, an adsorption bed and a gas flow distributor. The outer cylinder is arranged on the outer cylinder of the inner cylinder, and the adsorption bed is filled between the outer cylinder and the inner cylinder. The cylinder wall of the outer cylinder is provided with gas distribution holes, and the gas distribution holes are distributed in a gradient along the axial direction. The cylinder wall of the inner cylinder is provided with flow guide holes, and the axis of the flow guide holes forms an angle of 15-30 degrees with the radial direction of the inner cylinder. The gas flow distributor is installed at the gas inlet end of the outer cylinder. The radial tower and the adsorption process in the application greatly improve the gas flow uniformity, greatly reduce the radial flow velocity deviation, improve the utilization rate of the adsorbent, significantly reduce the energy consumption, are excellent in economy, save the land occupation and engineering investment, and are suitable for blast furnace gas CO2 capture of various scale steel enterprises.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas separation and energy saving, and particularly relates to a high-flux and low-energy-consumption radial tower for blast furnace gas carbon capture and a capture process. BACKGROUND

[0002] As a main by-product gas of the steel industry, blast furnace gas has a CO2 content of 15%-25%, and recycling thereof has both environmental protection and economic benefits. The existing VPSA process mostly uses an axial tower, which has four bottlenecks: 1. Under a high-flux working condition, the tower diameter is about 3-4 times that of a radial tower under the same flow cross-sectional area, and the occupied area is large, which makes it difficult to arrange the site; 2. When the tower diameter is large (especially when the tower diameter exceeds 10 meters), the airflow is unevenly distributed along the axial direction, which leads to insufficient utilization of the bed layer; 3. Under the same adsorbent loading and tower diameter conditions, the axial tower has a large bed layer thickness (usually 3-5 m), and the resistance loss is as high as 8-12 kPa, and the desorption energy consumption is high; and 4. The dead space volume accounts for 15%-20% of the tower capacity, and the increase in the circulation of the invalid gas increases the energy consumption.

[0003] In the prior art, the radial tower still has defects such as uneven gas distribution and obvious edge effect in solving the above problems. For example, the conventional radial tower has a uniform distribution of opening rates, which leads to a gas flow speed at the edge of the bed layer being 2-3 times that in the central region, and the utilization rate of the adsorbent is still low. In addition, there is currently a lack of a stepped vacuum desorption process matched with the radial tower, which makes it difficult to fully exert the energy-saving potential of the radial tower.

[0004] Therefore, how to provide a radial tower with uniform airflow distribution, low bed layer resistance, small dead space and small occupied area and a matching process, and realize a method for significantly reducing the energy consumption of blast furnace gas VPSA is a technical problem that those skilled in the art need to solve urgently. SUMMARY

[0005] To solve the above technical problems, the present application provides a high-flux and low-energy-consumption radial tower for blast furnace gas carbon capture and a capture process.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] A high-flux and low-energy-consumption radial tower for blast furnace gas carbon capture, comprising: an outer cylinder, an inner cylinder, an adsorption bed layer and an airflow distributor;

[0008] The outer cylinder is sleeved on the outer cylinder, and the adsorption bed layer is filled between the outer cylinder and the inner cylinder;

[0009] The cylinder wall of the outer cylinder is provided with a gas distribution hole, and the gas distribution hole is gradiently distributed along the axial direction;

[0010] The cylinder wall of the inner cylinder is provided with a flow guide hole, and the axis of the flow guide hole forms an angle of 15°-30° with the radial direction of the inner cylinder.

[0011] The gas flow distributor is installed at the gas inlet end of the outer cylinder.

[0012] Preferably, the hole density of the flow guide hole is 1.2-1.5 times of the hole density of the gas distribution hole, the perforated flow rate of the gas is adjusted by the opening density of the inner and outer cylinders, and the flow field distribution is optimized by the perforation resistance.

[0013] More preferably, the opening rates of the flow guide hole and the gas distribution hole are distributed in a parabolic shape along the axial direction, the opening rate of the middle section of the parabola is the highest and is 25%-30%, and gradually decreases to 10%-15% at both ends. By adjusting the opening rate in the radial tower axis direction, the gas flow change in the axial direction can be matched, and the overall flow field distribution can be optimized.

[0014] Preferably, the adsorption bed layer comprises a pretreatment protection layer, a main adsorption layer and a fine treatment layer from the inner cylinder to the outer cylinder. The present application realizes the function of one tower with multiple uses by the layered gradient adsorption method, obviously reduces the number of towers, appropriately increases the bed material thickness and material resistance, enhances the self-regulating ability of the bed, and is beneficial to the overall flow field distribution.

[0015] Preferably, the thickness ratio of the pretreatment protection layer, the main adsorption layer and the fine treatment layer is 1:3:1. By setting the main adsorption layer, the overall procurement cost of the adsorbent can be reduced, and the stability can be enhanced; by setting the fine treatment layer, the newly developed adsorbent can be applied, and the adsorption performance can be improved; the combination of the two can improve the selectivity and dynamic adsorption capacity of the overall adsorption material, thereby improving the recovery rate and purity of the product gas; the protection layer, the main adsorption layer and the fine adsorption layer are sequentially layered from the outside to the inside, and the cross-sectional area of the radial tower gradually decreases from the outside to the inside, which is beneficial to the utilization of the adsorbent bed, reduces the pressure drop, and is beneficial to reducing the operating energy consumption.

[0016] Preferably, the gas flow distributor comprises a ring-shaped buffer cavity and a radial flow guide plate.

[0017] Preferably, the radial flow guide plate is movably installed, and the included angle with the axis of the outer cylinder is adjustable, and the included angle is 30°-60°. The present application selects the angle most beneficial to the flow field distribution at the inlet of the adsorption tower by adjusting the included angle of the flow guide plate in combination with the blast furnace gas flow and pressure fluctuation, thereby optimizing the axial gas flow field distribution of the adsorption tower and reducing the technical risk of large radial towers.

[0018] A blast furnace gas carbon capture process using the above-mentioned high-flux low-energy-consumption radial tower for blast furnace gas carbon capture, specifically comprising the following steps:

[0019] After the blast furnace gas is pretreated, it is introduced from the outer cylinder, purified by the gradient adsorption of the adsorption bed layer, and the gas flow in the adsorption stage gradually decreases from the outside to the inside, which is beneficial to the adsorption of the gas. After the adsorption is completed, the pressure is gradually reduced, and the desorbed gas is recovered.

[0020] The residual gas discharged from the bottom of the radial tower is subjected to reverse pressure release, part of the CO2 is recovered, and vacuum desorption is carried out, and the gas flow gradually increases from the inside to the outside in the desorption stage, which is beneficial to the desorption of the gas. The desorption gas is compressed and recovered, and finally recycled by pressure increase, so that the coal gas enters the next round of adsorption cycle.

[0021] The present application does not produce other pollutants such as waste water, waste gas and dust during the operation of the cycle period, and belongs to the environment-friendly technology.

[0022] Preferably, in the process of gradient adsorption purification, the gas is sequentially adsorbed by the pretreatment protective layer, the main adsorption layer and the fine treatment layer at a radial flow rate of 0.8-1.2 m / s. The time of gradient adsorption purification is 60-90 s. The reasonable flow rate of the present application ensures the performance of the adsorbent, and the gradient purification adsorption time meets the product gas recovery rate and purity requirements.

[0023] Preferably, the pretreatment protective layer is filled with activated carbon and / or silica gel, which can adsorb moisture and other impurities;

[0024] The main adsorption layer is filled with 13X molecular sieve, which has stable performance and moderate cost;

[0025] The fine treatment layer is filled with IPE-CO2 molecular sieve, which has advanced performance and slightly higher cost.

[0026] Preferably, the gradient pressure reduction is divided into 2-4 stages to 0.03-0.05 MPa (g), and the pressure reduction rate of each stage is controlled at 0.02-0.03 MPa / s. By setting the gradient pressure reduction, the present application can reduce the impact strength of the gas flow on the equipment, and improve the utilization of residual pressure.

[0027] More preferably, the pressure of the coal gas introduced from the outer cylinder is about 0.15-0.3 MPa, which is suitable for the operating pressure of the blast furnace gas, does not need to increase the gas pressure additionally, reduces energy consumption and engineering cost.

[0028] More preferably, the pressure is reduced to 0.01-0.02 MPa after reverse pressure release, which reduces the impact strength of the gas flow on the equipment and is beneficial to the subsequent vacuum desorption work.

[0029] More preferably, the vacuum desorption adopts a two-stage vacuum system, which is first extracted to about -0.05 MPa (G) and maintained for 15-20 s, and then extracted to -0.085 MPa and maintained for 20-30 s. The two-stage vacuum system is selected to match the large flow and low vacuum condition in the first stage and the small flow and high vacuum degree condition in the second stage, so as to ensure that the equipment is in the high efficiency working area and is beneficial to energy saving.

[0030] More preferably, the pressure boosting cycle is to boost the pressure of the desorption gas and the purified desorption gas of other towers to the adsorption pressure, the pressure boosting time is 45-60s, and the next cycle is entered.

[0031] More preferably, the two-stage vacuum system adopts a Roots-water ring vacuum pump combination, and the limit vacuum degree is ≤5Pa.

[0032] More preferably, the blast furnace gas carbon capture process adopts a 4-6 tower linkage mode, and the towers are sequentially subjected to adsorption, pressure reduction, reverse pressure reduction, desorption and pressure boosting processes. When one tower fails or is under maintenance, the tower can be withdrawn from the system operation, the linkage system is re-established by adjusting the process time of other adsorption towers.

[0033] Compared with the prior art, the present application has the following advantages and technical effects:

[0034] The radial tower provided by the present application adopts a gradient opening design, so that the bed layer radial flow velocity deviation is ≤5%, the layered adsorption bed improves the targeting utilization rate of the adsorbent, the flexible airflow distributor can adapt to different gas quantity fluctuations (±20%), stable operation is ensured, the layered gradient purification adsorption can reduce the number of towers, the coupled utilization of different performance adsorbents is matched, the adsorption performance is ensured, the implementation cost is controlled, in the adsorption process provided by the present application, the stepwise pressure reduction reduces energy loss, the two-stage vacuum desorption reduces the load of the vacuum pump and improves the operation efficiency, and the multi-tower linkage can improve the overall processing capacity by 15%-20% and the operation reliability. In summary, the radial tower and the adsorption process in the present application greatly improve the airflow uniformity, greatly reduce the radial flow velocity deviation, improve the utilization rate of the adsorbent, match the blast furnace gas production pressure, significantly reduce the energy consumption, the radial tower provided by the present application has enhanced operation stability and can adapt to ±20% fluctuations in gas flow; the economy is excellent, the land occupation and engineering investment are saved, and the radial tower provided by the present application is suitable for blast furnace gas CO2 capture in various scale steel enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0036] Figure 1 It is a vertical section view of the radial tower for high-throughput and low-energy-consumption blast furnace gas carbon capture in embodiment 1 of the present application.

[0037] Figure 2 It is a vertical section view of the radial tower for high-throughput and low-energy-consumption blast furnace gas carbon capture in embodiment 1 of the present application.

[0038] Wherein the label is: 1-outer cylinder, 11-gas distribution hole, 2-inner cylinder, 21-flow guide hole, 3-adsorption bed, 31-pre-treatment protective layer, 32-main adsorption layer, 33-precise treatment layer, 4-gas flow distributor, 41-ring buffer cavity, 42-radiation flow guide plate.

[0039] Figure 3 For the inner cylinder flow guide hole included angle detail of the high flux and low energy consumption blast furnace gas carbon capture radial tower in embodiment 1 of the application;

[0040] Figure 4 For the inner cylinder outer cylinder opening rate detail of the high flux and low energy consumption blast furnace gas carbon capture radial tower in embodiment 1 of the application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application, and obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0042] In order to make the above-mentioned purposes, features and advantages of the application more apparent and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0043] The embodiment of the application provides a high flux and low energy consumption blast furnace gas carbon capture radial tower, which comprises an outer cylinder, an inner cylinder, an adsorption bed and a gas flow distributor.

[0044] The outer cylinder is sleeved on the inner cylinder, and the adsorption bed is filled between the outer cylinder and the inner cylinder.

[0045] The cylinder wall of the outer cylinder is provided with a gas distribution hole, and the gas distribution hole is distributed in a gradient along the axial direction.

[0046] The cylinder wall of the inner cylinder is provided with a flow guide hole, and the axis of the flow guide hole is at an included angle of 15°-30° with the radial direction of the inner cylinder.

[0047] The gas flow distributor is installed at the gas inlet end of the outer cylinder.

[0048] In a preferred embodiment, the hole density of the flow guide hole is 1.2-1.5 times that of the gas distribution hole.

[0049] More preferably, the opening rates of the flow guide hole and the gas distribution hole are both distributed in a parabolic shape along the axial direction, the opening rate of the middle section of the parabolic shape is the highest and is 25%-30%, and gradually decreases to 10%-15% at both ends.

[0050] In a preferred embodiment, the adsorption bed comprises, from the inner cylinder to the outer cylinder, a pretreatment protection layer, a main adsorption layer and a fine treatment layer in sequence.

[0051] In a preferred embodiment, the thickness ratio of the pretreatment protection layer, the main adsorption layer and the fine treatment layer is 1:3:1.

[0052] In a preferred embodiment, the gas flow distributor comprises a ring-shaped buffer cavity and a radial flow guide plate.

[0053] In a preferred embodiment, the radial flow guide plate is movably installed, and the included angle with the axis of the outer cylinder is adjustable, and the included angle is 30°-60°.

[0054] The embodiment of the present application also provides a blast furnace gas carbon capture process using the high-flux low-energy radial tower for blast furnace gas carbon capture.

[0055] The blast furnace gas is pretreated and then introduced from the outer cylinder, and is purified by gradient adsorption of the adsorption bed, and after adsorption, the pressure is reduced by gradient, and the desorbed gas is recovered;

[0056] The residual gas is discharged from the bottom of the radial tower, and the pressure is reduced in reverse, part of the CO2 is recovered, and then vacuum desorption is performed, the desorbed gas is compressed and recovered, and finally the pressure is increased to circulate, so that the gas enters the next adsorption cycle.

[0057] In a preferred embodiment, during the gradient adsorption and purification process, the gas is sequentially adsorbed by the pretreatment protection layer to remove impurities, the main adsorption layer to adsorb CO2, and the fine treatment layer to deeply adsorb and purify, at a radial flow rate of 0.8-1.2 m / s, and the time for gradient adsorption and purification is 60-90 s.

[0058] In a preferred embodiment, the pretreatment protection layer is filled with activated carbon and / or silica gel;

[0059] The main adsorption layer is filled with 13X molecular sieve;

[0060] The fine treatment layer is filled with IPE-CO2 molecular sieve.

[0061] In a preferred embodiment, the gradient pressure reduction is divided into 2-4 stages to reduce the pressure to 0.03-0.05 MPa (g), and the pressure reduction rate of each stage is controlled at 0.02-0.03 MPa / s.

[0062] In a more preferred embodiment, the pressure of the gas introduced from the outer cylinder is 0.15-0.3 MPa.

[0063] In a more preferred embodiment, the pressure is reduced to 0.01-0.02 MPa after the reverse pressure reduction.

[0064] In a more preferred embodiment, the vacuum desorption uses a two-stage vacuum system, first to about -0.05 MPa (G) for 15-20 s, and then to -0.085 MPa for 20-30 s.

[0065] In a more preferred embodiment, the pressure boosting cycle uses the equalized gas from other towers and the purified desorption gas to boost the pressure to the adsorption pressure, with a pressure boosting time of 45-60 s, and enters the next cycle.

[0066] In a more preferred embodiment, the two-stage vacuum system uses a Roots-water ring vacuum pump combination, with a limit vacuum degree of ≤5 Pa.

[0067] In a more preferred embodiment, the blast furnace gas carbon capture process uses a 4-6 tower linkage mode, and each tower sequentially performs the adsorption, pressure reduction, reverse pressure reduction, desorption, and pressure boosting processes. If the processing capacity needs to be improved, the vacuum time (such as 100 s) can be shortened, and the total cycle time can be correspondingly reduced; if the CO2 purity needs to be improved, the vacuum time can be prolonged.

[0068] Unless otherwise specified, the raw materials in the embodiments of the present application are by-products of the blast furnace ironmaking process;

[0069] The blast furnace gas is discharged from the gas outlet of the blast furnace top, and enters the device of the present application after passing through dust removal, H2S removal, and cooling facilities.

[0070] Unless otherwise specified, the room temperature or normal temperature in the embodiments of the present application refers to 25±3℃; and the blast furnace gas temperature refers to 40±3℃.

[0071] Embodiment 1

[0072] A high-flux and low-energy radial tower for blast furnace gas carbon capture, as shown in Figure 1 and 2 includes an outer cylinder 1, an inner cylinder 2, an adsorption bed 3, and a gas flow distributor 4.

[0073] The outer cylinder 1 is sleeved outside the inner cylinder 2, and the adsorption bed 3 is filled between the outer cylinder 1 and the inner cylinder 2.

[0074] The cylinder wall of the outer cylinder 1 is provided with gas distribution holes, and the gas distribution holes are gradiently distributed along the axial direction.

[0075] As shown in Figure 3 the cylinder wall of the inner cylinder 2 is provided with flow guide holes 21, and the axis of the flow guide holes 21 forms an angle of 15°-30° with the radial direction of the inner cylinder 2.

[0076] As shown in Figure 4The density of the holes of the flow guide hole 21 is 1.2-1.5 times the density of the holes of the air distribution hole, and the opening rates of the flow guide hole 21 and the air distribution hole are both distributed in the axial direction in a parabolic shape, the middle section of the parabolic shape has the highest opening rate of 25%-30%, and the two ends gradually decrease to 10%-15%.

[0077] The adsorption bed 3 includes, from the inner cylinder 2 to the outer cylinder 1, a pretreatment protection layer 31, a main adsorption layer 32, and a fine treatment layer 33, and the thickness ratio of the pretreatment protection layer 31, the main adsorption layer 32, and the fine treatment layer 33 is 1:3:1. The pretreatment protection layer 31 is filled with high-strength activated carbon and coarse-pore silica gel, and the filling ratio of the two is about 1:1, the main adsorption layer 32 is filled with 13X molecular sieve, and the fine treatment layer 33 is filled with IPE-CO2 molecular sieve.

[0078] The gas flow distributor 4 is installed at the gas inlet end of the outer cylinder 1 and includes an annular buffer cavity 41 and a radial flow guide plate 42, wherein the radial flow guide plate 42 is movably installed and the included angle with the axis of the outer cylinder 1 is adjustable, and the included angle is 30°-60°.

[0079] Example 2

[0080] A blast furnace gas carbon capture process uses the high-flux low-energy radial tower for blast furnace gas carbon capture of Example 1, adopts a 5-tower linkage mode, and each tower sequentially performs the processes of adsorption, pressure reduction, reverse pressure release, desorption, and pressure increase. Specifically, the process includes the following steps:

[0081] (1) Raw material pretreatment: After dust removal, cooling, and dehydration, the blast furnace gas is introduced into the outer cylinder 1 of the radial tower at a gas pressure of 0.15-0.3 MPa(g), and then enters the adsorption bed 3 through the gas flow distributor 4 to perform gradient adsorption;

[0082] (2) Gradient adsorption: The radial flow rate of the gas flow in the adsorption bed 3 is controlled to be 0.8-1.2 m / s, the pretreatment protection layer 31 adsorbs impurities such as residual H2S and water molecules, the main adsorption layer 32 selectively adsorbs CO2, and the fine treatment layer 33 deeply adsorbs and purifies, and the adsorption time is 60-90 s;

[0083] (3) Stepwise pressure reduction: After gradient adsorption, the pressure is reduced to 0.03-0.05 MPa(g) in 2-4 stages, and the pressure reduction rate of each stage is controlled to be 0.02-0.03 MPa / s, and the desorption gas is recovered;

[0084] (4) Reverse pressure release: The residual gas (containing a small amount of CO2) is discharged from the bottom of the tower to the buffer tank in a reverse direction, part of the CO2 is recovered, and the pressure is reduced to 0.01-0.02 MPa;

[0085] (5) Vacuum desorption: Two-stage vacuum system (Roots-water ring vacuum pump combination, limit vacuum degree ≤ 5 Pa) is used to first extract vacuum to about -0.05 MPa (g) for 15-20 s, then to -0.085 MPa for 20-30 s, and the desorption gas is recycled by compression;

[0086] (6) Pressure boosting cycle: The equalizing gas and purified desorption gas of other towers are used to boost the pressure to the adsorption pressure, the pressure boosting time is 45-60 s, and the cycle enters the next radial tower.

[0087] (7) The 5-tower linkage process timing is shown in Table 1:

[0088] Table 1

[0089]

[0090]

[0091] Wherein, T1, T2, T3, T4, T5 are radial towers in Example 1 connected in series.

[0092] In the 5-tower linkage process, the 5 towers are staggered and operated, at least one tower is in the "adsorption (A)" state at any time, ensuring continuous treatment of blast furnace gas, and the first-stage stepwise pressure reduction (E1D) corresponds to the first-stage stepwise pressure boost (E1R), and the second-stage stepwise pressure reduction (E2D) corresponds to the second-stage stepwise pressure boost (E2R), realizing efficient recovery of gas energy.

[0093] The vacuum extraction (V) time accounts for more than 26%, ensuring sufficient desorption of CO2; the multi-stage pressure boosting (E2R→E1R→FR) avoids the impact of adsorbent caused by sudden pressure rise, ensuring the balance between desorption and pressure boost. According to the actual pressure loss, the time distribution of E1D / E1R and E2D / E2R can be adjusted.

[0094] Comparative Example 1

[0095] In the blast furnace gas vacuum pressure swing adsorption CO2 capture process, the currently used adsorption tower is mainly a small gas axial adsorption tower, and there is no suitable radial adsorption tower for large gas for this process;

[0096] The inner cylinder and outer cylinder of the traditional radial tower adopt uniform hole opening mode, or only one component between the inner cylinder and the outer cylinder is distributed with different hole opening rates, and the angle of the airflow distributor is fixed, and the influence of the opening angle of the inner cylinder gas guide hole on the flow field is usually not considered. In addition, the traditional radial tower does not consider multi-gradient layered design.

[0097] Comparative Example 2

[0098] A blast furnace gas carbon capture process using the conventional radial tower and process in Comparative Example 1, specifically including adsorption, pressure reduction, reverse discharge, vacuum desorption, pressure increase procedures, does not contain multi-gradient layered material adsorption and multi-gradient precise vacuum desorption procedures.

[0099] Technical effects:

[0100] (1) The Fluent software was used to construct the three-dimensional geometric model of the two kinds of radial auxiliary towers, and the uniformity of the airflow in the tower in the process of Example 2 and Comparative Example 2 was calculated by multiple simulation groups. The results are as follows: the radial velocity deviation is reduced from 15% to 20% in the conventional radial tower to ≤5%, and the adsorbent utilization rate is more than 85%;

[0101] (2) The Fluent software was used to construct the three-dimensional geometric model of the two kinds of radial auxiliary towers, and the energy consumption of the process of Example 2 and Comparative Example 2 was calculated by multiple simulation groups. The results show that, compared with Comparative Example 2, the energy consumption of the process provided by Example 2 is significantly reduced, the adsorption bed resistance is reduced to 1.5-2.5 kPa, the dead space volume ratio is ≤8%, and the comprehensive energy consumption is reduced by 20%-35%;

[0102] (3) The Fluent software was used to construct the three-dimensional geometric model of the two kinds of radial auxiliary towers, and the running stability of Example 2 and Comparative Example 2 was calculated by multiple simulation groups. The results show that, compared with Comparative Example 2, the running stability of the process provided by Example 2 is significantly enhanced, and the coal gas flow in Example 2 can adapt to ±20% fluctuation.

[0103] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radial tower for high-throughput, low-energy-consumption blast furnace gas carbon capture, characterized in that, include: Outer cylinder, inner cylinder, adsorption bed, and airflow distributor; The outer cylinder is sleeved outside the inner cylinder, and the adsorption bed is filled between the outer cylinder and the inner cylinder; The outer cylinder has air distribution holes on its wall, and the air distribution holes are distributed in a gradient along the axial direction. The inner cylinder has a flow guide hole in its wall, and the axis of the flow guide hole forms an angle of 15° to 30° with the radial direction of the inner cylinder. The airflow distributor is installed at the air inlet end of the outer cylinder; The pore density of the flow guide hole is 1.2-1.5 times that of the air distribution hole; The opening ratios of the guide holes and air distribution holes are both parabolic along the axial direction, with the opening ratio being the highest at 25%-30% in the middle section of the parabola and gradually decreasing to 10%-15% at both ends.

2. The radial tower for high-throughput, low-energy-consumption blast furnace gas carbon capture according to claim 1, characterized in that, The adsorption bed consists of a pretreatment protective layer, a main adsorption layer, and a fine treatment layer, arranged sequentially from the inner cylinder to the outer cylinder.

3. A high-throughput, low-energy-consumption radial tower for blast furnace gas carbon capture according to claim 2, characterized in that, The thickness ratio of the pretreatment protective layer, the main adsorption layer, and the fine treatment layer is 1:3:

1.

4. A radial tower for high-throughput, low-energy-consumption blast furnace gas carbon capture according to claim 1, characterized in that, The airflow distributor includes an annular buffer chamber and radial guide vanes.

5. A high-throughput, low-energy-consumption radial tower for capturing carbon in blast furnace gas according to claim 4, characterized in that, The radial guide plate is movably installed and the angle between it and the axis of the outer cylinder is adjustable, with the angle being 30°~60°.

6. A blast furnace gas carbon capture process, characterized in that, The use of the high-throughput, low-energy-consumption radial tower for blast furnace gas carbon capture according to any one of claims 1-5 specifically includes the following steps: After pretreatment, the blast furnace gas is introduced into the outer cylinder and purified by gradient adsorption in the adsorption bed. After adsorption is completed, the pressure is reduced by gradient to recover the desorbed gas. The residual gas is discharged from the bottom of the radial tower for reverse depressurization, recovering some CO2, and then vacuum desorbed. The desorbed gas is compressed and recovered, and finally recirculated through pressurization to allow the coal gas to enter the next adsorption cycle.

7. The blast furnace gas carbon capture process according to claim 6, characterized in that, During the gradient adsorption purification process, the gas flows radially at a rate of 0.8~1.2 m / s, sequentially passing through the pretreatment protective layer to adsorb impurities, the main adsorption layer to adsorb CO2, and the fine treatment layer for deep adsorption purification. The gradient adsorption purification time is 60-90 s.

8. The blast furnace gas carbon capture process according to claim 7, characterized in that, The pretreatment protective layer is filled with activated carbon and / or silica gel; The main adsorption layer is filled with 13X molecular sieve; The fine treatment layer is filled with IPE-CO2 molecular sieve.

9. A blast furnace gas carbon capture process according to claim 6, characterized in that, The gradient pressure reduction is performed in 2 to 4 stages to reduce the pressure to 0.03 to 0.05 MPa(g), with the pressure reduction rate of each stage controlled at 0.02 to 0.03 MPa / s.

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