In-situ co2 capture device for a basic oxygen furnace steelmaking process
By integrating devices such as vortex separation chambers and adjustable cyclone generators into the converter steelmaking process, the problems of large size, complexity, and high energy consumption of CO2 capture systems in the converter steelmaking process have been solved, achieving efficient and low-cost in-situ CO2 capture.
Patent Information
- Application Number
- CN202521847602.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-28
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-28
AI Technical Summary
Existing CO2 capture technologies in converter steelmaking processes suffer from problems such as large and complex systems and high energy consumption. In particular, the solvent regeneration process of the chemical absorption method requires a large amount of steam, resulting in energy waste.
It adopts a vortex separation chamber, an adjustable cyclone generator, an ejector pipe, and a micro-dust re-spraying mechanism, which are integrated into the existing flue gas purification system of the converter. It replaces chemical solvent absorption with physical cyclone separation, and achieves in-situ CO2 capture by combining real-time adjustment of impeller parameters and ejector pipe inclination design.
It significantly reduced operating costs, improved CO2 capture efficiency and purity, adapted to converter flue gas fluctuations, and reduced equipment investment and energy consumption.
Smart Images
Figure CN224678078U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of environmental protection technology in iron and steel smelting, and in particular to an in-situ CO2 capture device for converter steelmaking process. Background Technology
[0002] Converter steelmaking is one of the main processes in modern steel production. During oxygen blowing smelting, a large amount of high-temperature flue gas is generated, whose main components are CO, CO2 and N2, with CO content as high as 60% or more. At present, the "unburned method" wet dust removal (OG method) is commonly used to cool, purify and recover the flue gas. The recovered flue gas (called converter gas) is an important secondary energy source.
[0003] However, converter gas still contains 15%-20% CO2. How to reduce carbon emissions from converter processes has become a focus of the industry. Existing carbon capture, utilization and storage (CCUS) technologies are mostly treated at the end of flue gas. Usually, the flue gas needs to be collected and transported to a special separation plant to extract CO2 using methods such as chemical absorption, adsorption or membrane separation. These methods have the following problems: 1) The system is large and complex: It requires additional large equipment such as absorption towers, desorption towers, and compressors, which occupy a large area and have extremely high investment and operating costs. 2) High energy consumption: In particular, the solvent regeneration process of the chemical absorption method requires a large amount of steam, resulting in energy waste. Therefore, we propose an in-situ CO2 capture device for the converter steelmaking process. Utility Model Content
[0004] In view of the problems of large and complex system and high energy consumption of the existing CO2 in-situ capture device in the converter steelmaking process, this utility model is proposed.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A CO2 in-situ capture device for converter steelmaking process includes a vortex separation chamber. The top of the vortex separation chamber is equipped with a connected air inlet, which is connected to the expansion section of the primary venturi outlet in the flue gas purification system via a flange. The top of the vortex separation chamber is equipped with a connected air outlet, which is connected to the throat of the secondary venturi in the flue gas purification system via a flange. An adjustable vortex generator, the adjustable vortex generator including an impeller located on the central axis of the vortex separation chamber and upstream of the air inlet, the impeller being driven by a drive structure; An ejector pipe is installed on the vortex separation chamber and is connected to the midstream section of the vortex separation chamber. The ejector pipe is also connected to an external CO2 compression and storage system. The micro-dust re-spraying mechanism includes an annular pipe installed on the inner wall of the downstream section of the vortex separation chamber. The annular pipe is equipped with atomizing nozzles arranged in a circumferential array. The annular pipe is connected to a high-pressure water pump through a connecting pipe.
[0006] As a technical solution of the CO2 in-situ capture device for converter steelmaking process described in this utility model, the driving structure includes a cross-shaped structure installed on the inner wall of the vortex separation chamber. A driven drive rod is vertically and rotatably mounted on the cross-shaped structure. An impeller is mounted on one end of the driven drive rod, and a driven bevel gear is mounted on the other end of the driven drive rod. A variable frequency motor is mounted on the vortex separation chamber. An active drive rod is vertically and rotatably mounted on the vortex separation chamber. One end of the active drive rod is connected to the output shaft of the variable frequency motor. An active bevel gear is mounted on one end of the active drive rod, and the active bevel gear meshes with the driven bevel gear.
[0007] As a technical solution of the CO2 in-situ capture device for converter steelmaking process described in this utility model, the blade angle and / or rotation speed of the impeller can be adjusted by an external frequency converter according to the real-time operating conditions of the flue gas.
[0008] As a technical solution of the CO2 in-situ capture device for converter steelmaking process described in this utility model, the central axis of the ejector pipe is set at 30°-45° with the central axis of the vortex separation chamber.
[0009] As a technical solution of the CO2 in-situ capture device for converter steelmaking process described in this utility model, wherein: the spray direction of the atomizing nozzle is inclined to the central axis of the vortex separation chamber.
[0010] As a technical solution of the CO2 in-situ capture device for converter steelmaking process described in this utility model, wherein: the inner wall of the vortex separation chamber is lined with a wear-resistant and refractory material layer.
[0011] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model directly embeds the vortex separation chamber between the primary and secondary venturi tubes of the existing flue gas purification system of the converter, thereby saving the land and equipment investment of an independent CCUS plant. At the same time, it uses physical cyclone separation to replace chemical solvent absorption, avoiding the high-energy-consuming solvent regeneration process, which can significantly reduce operating costs.
[0012] 2. This utility model, through the real-time adjustable impeller parameter design, adapts to the periodic flue gas fluctuations of the converter to improve the collection efficiency. Combined with the coordinated design of the micro-dust re-spraying mechanism and the inclination angle of the ejector pipe, it can suppress dust interference and maintain flow field stability to ensure continuous high-purity CO2 collection. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the main structure of this utility model.
[0014] Figure 2 This is a half-sectional structural diagram of the present invention.
[0015] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.
[0016] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B.
[0017] Explanation of reference numerals in the attached figures: In the diagram: 1. Vortex separation chamber; 101. Air inlet; 102. Air outlet; 103. Wear-resistant and refractory material layer; 2. Impeller; 3. Cross; 4. Driven drive rod; 5. Variable frequency motor; 6. Active drive rod; 7. Active bevel gear; 8. Driven bevel gear; 9. Ejector pipe; 10. Annular pipe; 11. Atomizing nozzle; 12. Connecting pipe. Detailed Implementation
[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0019] Reference Figures 1-4 This invention provides an in-situ CO2 capture device for converter steelmaking processes. The device includes a vortex separation chamber 1, with a connected air inlet 101 installed on the top of the vortex separation chamber 1. The air inlet 101 is connected to the expansion section of the primary venturi outlet in the flue gas purification system via a flange, receiving pre-purified flue gas at a temperature of approximately 150-200℃. The top of the vortex separation chamber 1 is also connected to an air outlet 102, which is connected to the throat of the secondary venturi in the flue gas purification system via a flange. By adopting an integrated design of the vortex separation chamber 1, the primary venturi outlet and the secondary venturi throat of the converter flue gas purification system are directly connected, achieving seamless connection of the flue gas treatment process and saving additional pipeline construction costs. An adjustable swirl generator includes an impeller 2 located on the central axis of the vortex separation chamber 1 and upstream of the air inlet 101. The impeller 2 is driven by a drive structure, and the intensity of the flue gas swirl is actively controlled by the impeller 2 to enhance the gas-solid separation efficiency. The ejector pipe 9 is installed on the vortex separation chamber 1 and is connected to the middle section of the vortex separation chamber 1. The ejector pipe 9 is also connected to the external CO2 compression and storage system. The layout design of the ejector pipe 9 allows for the extraction of CO2-enriched airflow from the middle section, avoiding dust interference and improving the collection purity. The micro-dust re-spraying mechanism includes an annular pipe 10 installed on the inner wall of the downstream section of the vortex separation chamber 1. The annular pipe 10 is equipped with atomizing nozzles 11 arranged in a circumferential array. The annular pipe 10 is connected to a high-pressure water pump (water pressure ≥ 5MPa) through a connecting pipe 12. The annular atomizing nozzles 11 suppress the re-entrainment of dust in the downstream section and ensure the continuity of CO2 capture.
[0020] Reference Figure 2 and Figure 3 The drive structure includes a cross 3 installed on the inner wall of the vortex separation chamber 1. A driven drive rod 4 is vertically and rotatably mounted on the cross 3. The impeller 2 is mounted on one end of the driven drive rod 4, and a driven bevel gear 8 is mounted on the other end of the driven drive rod 4. A variable frequency motor 5 is mounted on the vortex separation chamber 1. An active drive rod 6 is vertically and rotatably mounted on the vortex separation chamber 1. One end of the active drive rod 6 is connected to the output shaft of the variable frequency motor 5. An active bevel gear 7 is mounted on one end of the active drive rod 6. The active bevel gear 7 and the driven bevel gear 8 are meshed and connected. In application, the cross 3 supports the meshing of the bevel gears (active bevel gear 7 and driven bevel gear 8) to transmit power, ensuring the high-speed rotation stability of the impeller 2 and adapting to high-temperature and high-dust environments. Combined with the control of the variable frequency motor 5, the speed of the impeller 2 can be precisely adjusted to match the dynamic requirements of different flue gas conditions.
[0021] Reference Figure 2 and Figure 3 The blade angle and / or rotation speed of impeller 2 can be adjusted by an external frequency converter according to the real-time operating conditions of the flue gas. The adjustment range is 500-2000 rpm. In application, the adjustable blade angle / rotation speed design, combined with the flue gas flow rate and concentration, adjusts the swirl intensity in real time to optimize separation efficiency and reduce ineffective energy consumption.
[0022] Reference Figure 2 and Figure 4 The central axis of the ejector pipe 9 is set at 30°-45° to the central axis of the vortex separation chamber 1. In application, the 30°-45° angle ejector pipe 9 is designed to extract gas in accordance with the swirling direction, reduce vortex field disturbance, and maintain the stability of the flow field inside the vortex separation chamber 1.
[0023] Reference Figure 2 and Figure 4 The spray direction of the atomizing nozzle 11 is inclined to the central axis of the vortex separation chamber 1. In application, the design of the inclined atomizing nozzle 11, with the spray direction coordinated with the airflow trajectory, enhances the contact efficiency between water mist and dust and reduces the spray blind zone.
[0024] Reference Figure 2 and Figure 4 The inner wall of the vortex separation chamber 1 is covered with a wear-resistant and refractory material layer 103 (alumina-silicon carbide composite refractory layer, thickness ≥50mm). In application, the design of the wear-resistant and refractory material layer 103 can extend the service life of the device, resist the erosion of high-temperature flue gas and particulate matter, and reduce the maintenance frequency.
[0025] The working principle of this utility model is as follows: System start-up and pre-adjustment: Turn on the variable frequency motor 5, set the initial speed of impeller 2 (e.g., 1200 rpm) according to the current flue gas flow (e.g., ≥100,000 m³ / h during the blowing period), and then start the high pressure water pump to supply water to the annular pipe 10, and the atomizing nozzle 11 forms a water curtain barrier; In-situ capture operation: After passing through the first-stage venturi tube, the high-temperature flue gas enters the vortex separation chamber 1 through the inlet 101. The impeller 2 forcibly enhances the swirling flow. At this time, the heavy particulate dust is thrown towards the chamber wall and settles under the action of centrifugal force. The CO2-rich gas (concentration 15%-20%) in the middle section is pumped to the external CO2 compression and storage system through the ejector pipe 9 at an angle of 30°-45°. The residual dust in the downstream section is sprayed and condensed by the atomizing nozzle 11. The purified gas enters the second-stage venturi tube from the outlet 102. Dynamic optimization and shutdown: Real-time monitoring of flue gas parameters (flow rate, CO2 concentration) and adjustment of impeller speed / angle via frequency converter. During peak blowing period, the speed is increased to 1800 rpm to enhance separation strength. During interval period, the speed is reduced to 800 rpm for energy-saving operation. When the furnace is shut down, the high-pressure water pump and frequency converter motor 5 are turned off in sequence, and the integrity of the wear-resistant refractory material layer 103 is maintained.
[0026] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A CO2 in-situ capture device for converter steelmaking process, characterized in that: include: The vortex separation chamber (1) has a connected air inlet (101) installed on its top, and the air inlet (101) is connected to the expansion section of the primary venturi outlet in the flue gas purification system through a flange. The vortex separation chamber (1) has a connected air outlet (102) installed on its top, and the air outlet (102) is connected to the throat of the secondary venturi in the flue gas purification system through a flange. An adjustable vortex generator, the adjustable vortex generator including an impeller (2) located on the central axis of the vortex separation chamber (1) and upstream of the air inlet (101), the impeller (2) being driven by a drive structure; The ejector pipe (9) is installed on the vortex separation chamber (1) and is connected to the midstream section of the vortex separation chamber (1). The ejector pipe (9) is also connected to an external CO2 compression and storage system. The micro-dust re-spraying mechanism includes an annular pipe (10) installed on the inner wall of the downstream section of the vortex separation chamber (1). The annular pipe (10) is equipped with atomizing nozzles (11) arranged in a circular array. The annular pipe (10) is connected to a high-pressure water pump through a connecting pipe (12).
2. The in-situ CO2 capture device for converter steelmaking process according to claim 1, characterized in that: The drive structure includes a cross (3) installed on the inner wall of the vortex separation chamber (1), a driven drive rod (4) is vertically mounted and rotatably installed on the cross (3), an impeller (2) is installed on one end of the driven drive rod (4), a driven bevel gear (8) is installed on the other end of the driven drive rod (4), a variable frequency motor (5) is installed on the vortex separation chamber (1), an active drive rod (6) is vertically mounted and rotatably installed on the vortex separation chamber (1), one end of the active drive rod (6) is connected to the output shaft of the variable frequency motor (5), an active bevel gear (7) is installed on one end of the active drive rod (6), and the active bevel gear (7) meshes with the driven bevel gear (8).
3. The in-situ CO2 capture device for converter steelmaking process according to claim 2, characterized in that: The blade angle and / or rotational speed of the impeller (2) can be adjusted by an external frequency converter according to the real-time operating conditions of the flue gas.
4. The in-situ CO2 capture device for converter steelmaking process according to claim 1, characterized in that: The central axis of the ejector pipe (9) is set at 30°-45° with the central axis of the vortex separation chamber (1).
5. The in-situ CO2 capture device for converter steelmaking process according to claim 1, characterized in that: The spray direction of the atomizing nozzle (11) is inclined to the central axis of the vortex separation chamber (1).
6. The in-situ CO2 capture device for converter steelmaking process according to any one of claims 1-5, characterized in that: The inner wall of the vortex separation chamber (1) is covered with a wear-resistant and fire-resistant material layer (103).