RH vacuum tank baking carbon dioxide trapping system

Abstract

The invention provides an RH vacuum tank baking carbon dioxide trapping system which comprises a vacuum tank device, a baking device, a baking valve station, a movable sealing cover, a tail gas treatment device, an air inducing device, a storage device and a PLC device. Meanwhile, the vacuum tank device is convenient to mount and replace; through the tail gas treatment device, the components and temperature of the guided-out tail gas can be monitored in real time, meanwhile, the guided-out tail gas is cooled, and water vapor and dust in the tail gas are removed; and finally, the treated carbon dioxide gas with relatively high purity is recovered and stored through a storage device and is conveyed to a user side for use, so that closed-loop recovery of carbon dioxide in RH vacuum refining production is realized, and the problem that carbon dioxide generated in an RH process of a steelmaking enterprise is directly and disorderly emptied in the prior art is solved; not only is the carbon emission of steelmaking enterprises increased, but also the problem of carbon dioxide resource waste is caused.

Description

Technical Field

[0001] This invention relates to the field of energy-saving and environmental protection equipment, and more specifically, to an RH vacuum chamber baking carbon dioxide capture system. Background Technology

[0002] With increasingly stringent environmental protection requirements and the strategic goal of achieving carbon peaking and carbon neutrality, the control and management of carbon dioxide emissions are becoming increasingly strict. Steel companies, as major players in carbon reduction, will face enormous environmental pressure, leading to increased operating costs. Furthermore, with continuous technological advancements, carbon dioxide has been widely used as a resource in agriculture, chemicals, steel, and other fields. However, the stable supply and cost of carbon dioxide remain the main limitations on its use.

[0003] Based on the foregoing analysis, steel enterprises are both major producers and consumers of carbon dioxide, thus enabling its recycling. To address these issues, it is urgent to control and recover carbon dioxide during the steel production process.

[0004] RH vacuum refining technology is an indispensable part of the refining process in modern steel enterprises, playing a crucial role in steel production. The RH vacuum tank is the main equipment for the steel refining reaction, its interior constructed of refractory materials. To meet production demands, the refractory materials need to be baked to over 1000℃ during operation. This baking process primarily utilizes natural gas, coke oven gas, and converter gas as fuels through combustion. This process generates a large amount of carbon dioxide gas, which is currently released directly and haphazardly into the atmosphere, increasing carbon emissions from steel enterprises and wasting carbon dioxide resources.

[0005] To address the aforementioned issues, there is an urgent need to research an RH vacuum tank baking carbon dioxide capture system to further reduce the disorderly emissions of carbon dioxide from the RH process in steelmaking enterprises, and to recover and store the carbon dioxide for its resource utilization. Summary of the Invention

[0006] The main objective of this invention is to provide an RH vacuum tank baking carbon dioxide capture system, which at least solves the problem that in the prior art, carbon dioxide generated in the RH process of steelmaking enterprises is directly and disorderly released into the air, which not only increases the carbon emissions of steelmaking enterprises, but also causes waste of carbon dioxide resources.

[0007] To achieve the above objectives, the present invention provides an RH vacuum chamber baking carbon dioxide capture system, comprising: a vacuum chamber device, which is placed vertically at a baking station, the inner wall of the vacuum chamber device being lined with refractory material, and both the upper and lower ends of the vacuum chamber device being open structures; a baking device, which is disposed above the baking station and seals the open structure at the upper end of the vacuum chamber device, the baking device being used to burn combustible gas to bake the refractory material inside the vacuum chamber device; a baking valve station, which is connected to the baking device, and is used to supply combustible gas and combustion-supporting gas to the baking device and control the baking temperature of the baking device; and a movable sealing cover, which is detachably and openably disposed at the baking station. Below, a movable sealing cover is used to seal the open structure at the lower end of the vacuum chamber device when it is placed in the baking station, allowing exhaust gas generated during the baking process to be discharged through the movable sealing cover; an exhaust gas treatment device, connected to the movable sealing cover, is used to treat the exhaust gas discharged from the movable sealing cover to improve the purity of carbon dioxide in the exhaust gas; an exhaust fan, with its inlet end connected to the exhaust gas treatment device, is used to generate negative pressure to draw in the exhaust gas generated during the baking process of the vacuum chamber device; a storage device, connected to the outlet end of the exhaust fan and the user end, is used to store the carbon dioxide gas treated by the exhaust gas treatment device and supply it to the user end; a PLC device, connected to the baking device, baking valve station, movable sealing cover, exhaust gas treatment device, exhaust fan device, and storage device, controls the operation of the baking device, baking valve station, movable sealing cover, exhaust gas treatment device, exhaust fan device, and storage device.

[0008] Furthermore, the lower end of the vacuum tank device has an impregnation tube structure, and the lower end of the impregnation tube structure is an open structure; wherein, a movable sealing cover can be opened or closed to cover the impregnation tube structure to seal the open structure at the lower end of the vacuum tank device.

[0009] Furthermore, the baking device includes: a baking cover, movably disposed above the baking station, the baking cover being used to seal the open structure at the upper end of the vacuum chamber device when the vacuum chamber device is placed in the baking station; and a burner, disposed on the baking cover and connected to the baking valve station, the baking valve station supplying combustible gas and combustion-supporting gas to the burner, the burner burning combustible gas to bake the refractory material inside the vacuum chamber device.

[0010] Furthermore, the movable sealing cover includes: a slag receiving plate, which is vertically positioned directly below the open structure at the lower end of the vacuum tank device; two cover sections, each with a semi-circular structure and an inner arc structure matching the open structure at the lower end of the vacuum tank device; when the two cover sections are closed together, they form an annular structure and engage with the slag receiving plate to seal the open structure at the lower end of the vacuum tank device; and two drive mechanisms, which are located on both sides of the two cover sections and connected to the corresponding sections, and are used to drive the two cover sections to move relative to each other in the horizontal direction to open or close.

[0011] Furthermore, the exhaust gas treatment device includes: a first detection unit for detecting the composition and temperature of the exhaust gas discharged from the movable sealing cover; an air cooler for cooling the exhaust gas discharged from the movable sealing cover and removing water vapor; and a dust collector for removing dust from the exhaust gas discharged from the movable sealing cover.

[0012] Furthermore, the exhaust gas treatment device also includes: a first connecting pipe, through which the exhaust gas treatment device is connected to a movable sealing cover; a second connecting pipe, through which the exhaust gas treatment device is connected to an exhaust fan; a first valve, disposed on the first connecting pipe; a second valve, disposed on the second connecting pipe; wherein, a first detection unit is installed on the first connecting pipe.

[0013] Furthermore, the storage device includes: a storage tank having an inlet end and an outlet end; the inlet end of the storage tank being connected to an exhaust fan via a third connecting pipe; and the outlet end of the storage tank being connected to a user end via a fourth connecting pipe. The storage tank is equipped with a pressure detection mechanism and a safety release mechanism. The pressure detection mechanism is used to detect the pressure of the exhaust gas stored inside the storage tank, and the safety release mechanism is used to release the exhaust gas to relieve pressure when the exhaust gas pressure inside the storage tank exceeds a preset value.

[0014] Furthermore, the storage device also includes: an vent pipe, disposed on the third connecting pipe; a pressurizer, disposed on the third connecting pipe and located between the storage tank and the vent pipe; a third valve, disposed on the third connecting pipe and located between the storage tank and the pressurizer; and a second detection unit, disposed on the third connecting pipe, the second detection unit being used to detect the composition of the exhaust gas entering the storage tank.

[0015] This invention discloses an RH vacuum chamber baking carbon dioxide capture system, comprising a vacuum chamber device, a baking device, a baking valve station, a movable sealing cover, a tail gas treatment device, an exhaust fan, a storage device, and a PLC device. The vacuum chamber device is placed vertically at the baking station, and its inner wall is lined with refractory material. Both the upper and lower ends of the vacuum chamber device are open structures. The baking device is positioned above the baking station and seals the open structure at the upper end of the vacuum chamber device. The baking device is used to burn combustible gas to bake the refractory material inside the vacuum chamber device. The baking valve station is connected to the baking device and supplies combustible gas and combustion-supporting gas to the baking device and controls the baking temperature of the baking device. The movable sealing cover... The cover can be opened or closed and is set below the baking station. The movable sealing cover is used to seal the open structure at the lower end of the vacuum tank device when the vacuum tank device is placed in the baking station, so that the exhaust gas generated during the baking process can be discharged through the movable sealing cover. The exhaust gas treatment device is connected to the movable sealing cover and is used to treat the exhaust gas discharged by the movable sealing cover to improve the purity of carbon dioxide in the exhaust gas. The inlet end of the exhaust fan device is connected to the exhaust gas treatment device and is used to generate negative pressure to draw in the exhaust gas generated by the vacuum tank device during the baking process. The storage device is connected to the outlet end of the exhaust fan device and the user end. The storage device is used to store the carbon dioxide gas treated by the exhaust gas treatment device and supply it to the user end. The PLC device is connected to the baking device, baking valve station, movable sealing cover, exhaust gas treatment device, exhaust fan device, and storage device to control the operation of the baking device, baking valve station, movable sealing cover, exhaust gas treatment device, exhaust fan device, and storage device. This collection system uses a movable sealing cover to collect and export the carbon dioxide generated during the baking process of the vacuum tank device, facilitating the installation and replacement of the vacuum tank device. The exhaust gas treatment device monitors the composition and temperature of the exported exhaust gas in real time, while simultaneously cooling the exhaust gas and removing water vapor and dust. Finally, the storage device recovers and stores the treated, high-purity carbon dioxide gas and supplies it to users, achieving closed-loop carbon dioxide recovery in RH vacuum refining production. This solves the problem of existing technologies where carbon dioxide generated in the RH process of steelmaking enterprises is directly and disorderly vented, increasing carbon emissions and wasting carbon dioxide resources. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of an optional RH vacuum chamber baking carbon dioxide capture system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of a movable sealing cover of an optional RH vacuum bath baking carbon dioxide capture system according to an embodiment of the present invention.

[0019] The above drawings include the following reference numerals:

[0020] 10. Vacuum tank device; 11. Refractory material; 12. Impregnation tube structure; 20. Baking device; 21. Baking cover; 22. Burner; 30. Baking valve station; 40. Movable sealing cover; 41. Slag receiving tray; 42. Cover body; 43. Drive mechanism; 50. Tail gas treatment device; 51. First detection unit; 52. First connecting pipe; 53. Second connecting pipe; 54. First valve; 55. Second valve; 60. Exhaust fan device; 70. Storage device; 71. Storage tank; 72. Third connecting pipe; 73. Fourth connecting pipe; 74. Exhaust pipe; 75. Pressurizer; 76. Third valve; 77. Second detection unit; 78. Fourth valve; 79. Fifth valve; 80. PLC device. Detailed Implementation

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] An embodiment of the present invention provides an RH vacuum chamber baking carbon dioxide capture system, comprising a vacuum chamber device 10, a baking device 20, a baking valve station 30, a movable sealing cover 40, a tail gas treatment device 50, an exhaust fan 60, a storage device 70, and a PLC device 80. The vacuum chamber device 10 is placed vertically at the baking station, and its inner wall is lined with refractory material 11. The upper and lower ends of the vacuum chamber device 10 are open structures. The baking device 20 is positioned above the baking station and seals the open structure at the upper end of the vacuum chamber device 10. The baking device 20 is used to burn combustible gas to bake the refractory material 11 inside the vacuum chamber device 10. The baking valve station 30 is connected to the baking device 20 and is used to supply combustible gas and combustion-supporting gas to the baking device 20 and control the baking temperature of the baking device 20. The vacuum chamber device 10 is positioned below the baking station and can be opened or closed. The movable sealing cover 40 seals the open structure at the lower end of the vacuum chamber device 10 when it is placed in the baking station, allowing exhaust gas generated during the baking process to be discharged through the movable sealing cover 40. An exhaust gas treatment device 50 is connected to the movable sealing cover 40 and treats the exhaust gas discharged from the movable sealing cover 40 to improve the purity of carbon dioxide in the exhaust gas. The inlet end of the exhaust fan device 60 is connected to the exhaust gas treatment device 50, and the exhaust fan device 60 generates negative pressure to draw in the exhaust gas generated during the baking process of the vacuum chamber device 10. A storage device 70 is connected to the outlet end of the exhaust fan device 60 and to the user end, and the storage device 70 stores the carbon dioxide gas treated by the exhaust gas treatment device 50 and supplies it to the user end. The PLC unit 80 is connected to the baking device 20, baking valve station 30, movable sealing cover 40, exhaust gas treatment device 50, induced draft device 60, and storage device 70 to control their operation. This collection system uses the movable sealing cover 40 to collect and export the carbon dioxide generated during the baking process of the vacuum tank device 10, facilitating the installation and replacement of the vacuum tank device 10. The exhaust gas treatment device 50 monitors the composition and temperature of the exported exhaust gas in real time, while cooling and removing water vapor and dust. Finally, the storage device 70 recovers and stores the treated, high-purity carbon dioxide gas and supplies it to users, achieving closed-loop carbon dioxide recovery in RH vacuum refining production. This solves the problem of direct and disorderly venting of carbon dioxide generated in the RH process of steelmaking enterprises in existing technologies, which not only increases carbon emissions but also wastes carbon dioxide resources.

[0023] In specific implementation, the upper end of the vacuum tank device 10 is a flange-type open structure. The baking device 20 includes a baking cover 21 and a burner 22. The baking cover 21 is movably mounted above the baking station. A swing arm drive mechanism is provided on the baking cover 21 to drive the baking cover 21 to flip up. When the vacuum tank device 10 to be baked is placed in the baking station, the swing arm drive mechanism drives the baking cover 21 to fall onto the flange-type open structure at the upper end of the vacuum tank device 10 to seal the upper end of the vacuum tank device 10. After the vacuum tank device 10 is baked, the swing arm drive mechanism will drive the baking cover 21 to flip up, thereby facilitating the lifting of the baked vacuum tank device 10. The burner 22 is located at the center of the baking cover 21 and is connected to the baking valve station 30. The baking valve station 30 supplies combustible gas and combustion-supporting gas to the burner 22. The burner 22 burns the combustible gas to bake the refractory material 11 inside the vacuum tank device 10. The combustible gas is generally natural gas, coke oven gas, or converter gas, and oxygen is introduced for combustion support.

[0024] The lower end of the vacuum tank device 10 has an impregnation tube structure 12, which is an open structure. A movable sealing cover 40 is installed on the impregnation tube structure 12, which can be opened or closed to seal the open structure at the lower end of the vacuum tank device 10. This ensures that the entire vacuum tank device 10 is sealed and that the generated exhaust gas will not leak.

[0025] Specifically, the movable sealing cover 40 includes a slag receiving plate 41, two cover sections 42, and two drive mechanisms 43. The slag receiving plate 41 is vertically positioned directly below the impregnation tube structure 12 located at the lower end of the vacuum tank device 10. The cover section 42 has a semi-circular structure, and the inner arc structure of the cover section 42 matches the outer diameter of the impregnation tube structure 12. When the two cover sections 42 are closed together, they form an annular structure and engage with the slag receiving plate 41, thereby surrounding and sealing the impregnation tube structure 12. The two drive mechanisms 43 are located on both sides of the two cover sections 42 and are correspondingly connected to the two cover sections 42. The two drive mechanisms 43 are used to drive the two cover sections 42 to move relative to each other in the horizontal direction to open or close. When the vacuum tank device 10 needs to be lifted after baking, the two drive mechanisms 43 drive the two cover sections 42 to move away from each other, thereby separating them from the impregnation tube structure 12, allowing the vacuum tank device 10 to be easily lifted away from the baking station. After the new vacuum tank device 10 is placed in the baking station, the two drive mechanisms 43 drive the two cover sections 42 to move closer to each other, re-enclosing and sealing the impregnation tube structure 12. Optionally, the drive mechanism 43 is a hydraulic cylinder.

[0026] Furthermore, the exhaust gas treatment device 50 includes a first detection unit 51, an air cooler, and a dust collector. The first detection unit 51 is used to detect the composition and temperature of the exhaust gas discharged from the movable sealing cover 40; the air cooler is used to cool the exhaust gas discharged from the movable sealing cover 40 and remove water vapor; and the dust collector is used to remove dust from the exhaust gas discharged from the movable sealing cover 40. After treatment by the exhaust gas treatment device 50, the carbon dioxide in the exhaust gas has a higher purity, thus providing conditions for subsequent recycling.

[0027] Furthermore, the exhaust gas treatment device 50 also includes a first connecting pipe 52, a second connecting pipe 53, a first valve 54, and a second valve 55. The exhaust gas treatment device 50 is connected to the movable sealing cover 40 through the first connecting pipe 52; the exhaust gas treatment device 50 is connected to the induced draft device 60 through the second connecting pipe 53; the first detection unit 51 and the first valve 54 are both installed on the first connecting pipe 52; the second valve 55 is installed on the second connecting pipe 53. By installing the first valve 54 and the second valve 55, the exhaust gas treatment and recovery process can be flexibly controlled.

[0028] Furthermore, the storage device 70 includes a storage tank 71, which has an inlet end and an outlet end. The inlet end of the storage tank 71 is connected to the exhaust fan 60 via a third connecting pipe 72 to store the treated high-purity carbon dioxide gas. The outlet end of the storage tank 71 is connected to the user end via a fourth connecting pipe 73 to supply carbon dioxide gas to the user end. The storage tank 71 is equipped with a pressure detection mechanism and a safety release mechanism. The pressure detection mechanism is used to detect the pressure of the exhaust gas stored inside the storage tank 71, and the safety release mechanism is used to release the exhaust gas to relieve pressure when the exhaust gas pressure inside the storage tank 71 exceeds a preset value, thereby effectively ensuring the safety of gas storage.

[0029] Furthermore, the storage device 70 also includes an vent pipe 74, a pressurizer 75, a third valve 76, a second detection unit 77, a fourth valve 78, and a fifth valve 79. The vent pipe 74 is disposed on the third connecting pipe 72 and is used to discharge exhaust gas that has not reached the predetermined purity. The pressurizer 75 is disposed on the third connecting pipe 72 and located between the storage tank 71 and the vent pipe 74. The pressurizer 75 can pressurize and transport the treated exhaust gas into the storage tank 71 to achieve large-capacity storage. The third valve 76 is disposed on the third connecting pipe 72 and located between the storage tank 71 and the pressurizer 75 to cut off the supply of treated exhaust gas to the storage tank 71. The second detection unit 77 is disposed on the third connecting pipe 72 and is used to detect the composition of the exhaust gas entering the storage tank 71. The fourth valve 78 is disposed on the fourth connecting pipe 73 to cut off the supply of high-purity carbon dioxide gas to the user end. The fifth valve 79 is disposed on the vent pipe 74 to cut off the vent pipe.

[0030] The specific working process of the RH vacuum chamber baking carbon dioxide capture system of the present invention is as follows:

[0031] S1: Before starting work, the movable sealing cover 40 is in the open state. After the vacuum tank device 10 to be baked is placed in the baking station by the hoisting equipment, the two sections of the cover 42 of the movable sealing cover 40 are closed by the PLC device 80 to seal the impregnation tube structure 12 of the vacuum tank device 10.

[0032] S2: The baking device 20 is controlled by the PLC device 80. The baking cover 21 is moved to the flange-type open structure at the upper end of the vacuum tank device 10 through the swing arm mechanism to seal the upper end of the vacuum tank device 10. Under the control of the PLC device 80, the combustible gas and combustion-supporting gas of the baking valve station 30 are opened to ignite the burner 22.

[0033] S3: Under the control of the PLC device 80, the baking valve station 30 controls the flame size of the burner 22 and thus the baking temperature according to the required baking temperature of the refractory material 11 in the vacuum chamber device 10 at different stages, based on the opening degree of the valves for combustible gas and combustion-supporting gas on the baking valve station 30, thereby ensuring the baking quality of the refractory material 11. Simultaneously, the first detection unit 51 of the exhaust gas treatment device 50 detects the components such as CO, CO2, and O2 in the exhaust gas. By controlling the opening degree of the valves for combustible gas and combustion-supporting gas on the baking valve station 30, the ratio of combustible gas and combustion-supporting gas is adjusted in real time to ensure that the carbon elements in the fuel are fully combusted during the baking process, completely converted into carbon dioxide, and recovered.

[0034] S4: The induced draft device 60 is turned on simultaneously, and the first valve 54 and the second valve 55 on the exhaust gas treatment device 50 are opened. At the same time, the fifth valve 79 on the exhaust pipe 74 is opened to exhaust the exhaust gas with impure components from the initial combustion process. After the carbon dioxide purity result detected by the second detection unit 77 meets the standard, the fifth valve 79 on the exhaust pipe 74 is closed to prepare for the collection of carbon dioxide gas. At the same time, the third valve 76 is opened, the pressurizer 75 is turned on, and the fourth valve 78 is closed. At this time, the collected carbon dioxide gas will be pressurized by the pressurizer 75 and sent to the storage tank 71 for storage. After the pressure detection mechanism on the storage tank 71 detects that the pressure has reached the set value, the fourth valve 78 can be opened to supply the user.

[0035] S5: During the carbon dioxide collection process, the exhaust gas treatment device 50 operates synchronously. The exhaust gas is cooled and water vapor is removed by the air cooler with a water-cooled structure in the exhaust gas treatment device 50. At the same time, the dust collector removes dust from the exhaust gas to prevent dust and other particles from entering the storage tank 71, thus ensuring the quality of the recovered carbon dioxide gas.

[0036] S6: After baking is completed, the baking valve station 30 automatically cuts off the gas and combustion-supporting gas. After the burner 22 of the baking device 20 is extinguished, the control arm mechanism moves the baking cover 21 away from the upper port of the vacuum chamber device 10, and at the same time controls the two sections 42 of the movable sealing cover 40 to open. The vacuum chamber device 10, which has completed baking, is then lifted away by hoisting equipment. During this process, the second detection unit 77 continues to detect the purity of carbon dioxide. When the exhaust gas composition test result fails to meet the standard, the third valve 76 is closed and the fifth valve 79 is opened to vent the substandard exhaust gas.

[0037] S7: If a new vacuum chamber device 10 needs to be baked, repeat steps S1-S6 above.

[0038] S8: If the new vacuum chamber device 10 is no longer to be baked, then shut off the induced draft device 60 and the exhaust gas treatment device 50, as well as the first valve 54, the second valve 55, the third valve 76 and the fifth valve 79.

[0039] The aforementioned equipment and valves operate automatically according to a set program under the control of the PLC device 80.

[0040] The beneficial effects of this invention are:

[0041] This invention provides an RH vacuum tank baking carbon dioxide capture system. Utilizing the open design of the vacuum tank device 10 at both the top and bottom, a matching baking device 20 and a movable sealing cover 40 are designed to ensure the baking process in the vacuum tank device 10 is conducted in a relatively sealed environment. This not only enables 100% recovery of carbon dioxide gas generated during the RH refining furnace vacuum tank baking process but also prevents the degradation of the recovered gas quality due to the intrusion of external gases. The system also includes a corresponding exhaust gas treatment device 50, an induced draft device 60, and a storage device 70, which can remove and efficiently recover the temperature, moisture, dust, and other harmful substances from the exhaust gas, providing an effective method for steel enterprises to reduce carbon dioxide emissions and achieve orderly recycling.

[0042] Taking a domestic steelmaking RH vacuum refining furnace as an example, the RH refining furnace is equipped with 3 sets of vacuum tank baking stations, of which 2 sets are used for a long time. It uses natural gas as fuel and oxygen as combustion gas. According to the average natural gas consumption during normal baking process, it is 150 Nm3 / h. The effective operating days per year are 300 days. Then, the two vacuum tank baking stations will generate a total of 2,160,000 Nm3 of carbon dioxide, which is equivalent to 4,270.32 tons. The average price of industrial carbon dioxide is 349 yuan per ton. After all of them are captured, they will generate an economic benefit of 1,490,342 yuan.

[0043] Taking a domestic steelmaking RH vacuum refining furnace as an example, this RH refining furnace is equipped with 3 sets of vacuum tank baking stations, of which 2 sets are used for a long time. It uses converter gas as fuel and oxygen as combustion gas. According to the average converter gas consumption during normal baking process, it is 800 Nm3 / h, and the effective operating days per year are 300 days. Then, the two vacuum tank baking stations will generate a total of 10,368,000 Nm3 of carbon dioxide, which is equivalent to 20,497.536 tons. The average price of industrial carbon dioxide is 349 yuan per ton. After all of them are captured, they will generate an economic benefit of 7,153,640 yuan.

[0044] According to incomplete statistics, there are more than 100 RH vacuum refining furnaces in operation nationwide, all of which capture and recover carbon dioxide during vacuum baking, which will cumulatively reduce carbon dioxide emissions by about 1 million tons.

[0045] This invention captures and stores carbon dioxide generated during the RH vacuum oven baking process, providing a guarantee for subsequent use and further reducing the cost of carbon dioxide resource utilization for steel enterprises.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A carbon dioxide capture system for RH vacuum baking, characterized in that, include: Vacuum tank device (10), the vacuum tank device (10) is placed vertically in the baking station, the inner wall of the vacuum tank device (10) is lined with refractory material (11), and the upper and lower ends of the vacuum tank device (10) are open structures. A baking device (20) is provided above the baking station and seals the open structure at the upper end of the vacuum tank device (10). The baking device (20) is used to burn combustible gas to bake the refractory material (11) inside the vacuum tank device (10). Baking valve station (30) is connected to the baking device (20). The baking valve station (30) is used to supply combustible gas and combustion-supporting gas to the baking device (20) and control the baking temperature of the baking device (20). A movable sealing cover (40) is provided below the baking station and can be opened or closed. The movable sealing cover (40) is used to seal the open structure at the lower end of the vacuum tank device (10) when the vacuum tank device (10) is placed in the baking station so that the exhaust gas generated during the baking process can be discharged through the movable sealing cover (40). The exhaust gas treatment device (50) is connected to the movable sealing cover (40). The exhaust gas treatment device (50) is used to treat the exhaust gas discharged from the movable sealing cover (40) to improve the purity of carbon dioxide in the exhaust gas. A draft fan (60) is provided, the inlet end of which is connected to the exhaust gas treatment device (50). The draft fan (60) is used to generate negative pressure to draw out the exhaust gas generated during the baking process of the vacuum tank device (10). A storage device (70) is connected to the outlet end of the exhaust fan (60) and to the user end. The storage device (70) is used to store carbon dioxide gas after it has been treated by the exhaust gas treatment device (50) and supply it to the user end. The PLC unit (80) is connected to the baking device (20), the baking valve station (30), the movable sealing cover (40), the exhaust gas treatment device (50), the induced draft device (60), and the storage device (70) to control their operation.

2. The RH vacuum chamber baking carbon dioxide capture system according to claim 1, characterized in that, The lower end of the vacuum tank device (10) has an impregnation tube structure (12), and the lower end of the impregnation tube structure (12) is an open structure. The movable sealing cover (40) can be opened or closed and is installed on the impregnation tube structure (12) to seal the open structure at the lower end of the vacuum tank device (10).

3. The RH vacuum chamber baking carbon dioxide capture system according to claim 1, characterized in that, The baking apparatus (20) includes: A baking cover (21) is movably disposed above the baking station. The baking cover (21) is used to seal the open structure at the upper end of the vacuum tank device (10) when the vacuum tank device (10) is placed at the baking station. A burner (22) is disposed on the baking cover (21) and connected to the baking valve station (30). The baking valve station (30) supplies combustible gas and combustion-supporting gas to the burner (22). The burner (22) burns the combustible gas to bake the refractory material (11) inside the vacuum chamber device (10).

4. The RH vacuum chamber baking carbon dioxide capture system according to claim 1, characterized in that, The movable sealing cover (40) includes: The slag receiving tray (41) is vertically positioned directly below the open structure at the lower end of the vacuum tank device (10); Two sections of cover (42), the cover (42) is a semi-circular structure and the inner arc structure of the cover (42) matches the open structure at the lower end of the vacuum tank device (10); when the two sections of the cover (42) are closed together, they form an annular structure and are joined with the slag receiving plate (41) to seal the open structure at the lower end of the vacuum tank device (10). Two drive mechanisms (43) are provided on both sides of the two sections of the cover (42) and connected to the corresponding sections of the cover (42). The two drive mechanisms (43) are used to drive the two sections of the cover (42) to move relative to each other in the horizontal direction to open or close each other.

5. The RH vacuum chamber baking carbon dioxide capture system according to claim 1, characterized in that, The exhaust gas treatment device (50) includes: The first detection unit (51) is used to detect the composition and temperature of the exhaust gas discharged from the active sealing cover (40); An air cooler is used to cool the exhaust gas discharged from the movable sealing cover (40) and remove water vapor; A dust collector is used to remove dust from the exhaust gas vented by the active sealing hood (40).

6. The RH vacuum chamber baking carbon dioxide capture system according to claim 5, characterized in that, The exhaust gas treatment device (50) further includes: The exhaust gas treatment device (50) is connected to the movable sealing cover (40) via the first connecting pipe (52); The exhaust gas treatment device (50) is connected to the induced draft device (60) via the second connecting pipe (53); The first valve (54) is installed on the first connecting pipe (52); The second valve (55) is installed on the second connecting pipe (53); The first detection unit (51) is installed on the first connecting pipe (52).

7. The RH vacuum chamber baking carbon dioxide capture system according to claim 1, characterized in that, The storage device (70) includes: The storage tank (71) has an inlet end and an outlet end. The inlet end of the storage tank (71) is connected to the air duct (60) through a third connecting pipe (72); the outlet end of the storage tank (71) is connected to the user end through a fourth connecting pipe (73). The storage tank (71) is equipped with a pressure detection mechanism and a safety release mechanism. The pressure detection mechanism is used to detect the pressure of the exhaust gas stored inside the storage tank (71). The safety release mechanism is used to release the exhaust gas to relieve pressure when the exhaust gas pressure inside the storage tank (71) is greater than a preset value.

8. The RH vacuum chamber baking carbon dioxide capture system according to claim 7, characterized in that, The storage device (70) further includes: An vent pipe (74) is provided on the third connecting pipe (72); A pressurizer (75) is installed on the third connecting pipe (72) and located between the storage tank (71) and the drain pipe (74); The third valve (76) is installed on the third connecting pipe (72) and located between the storage tank (71) and the pressurizer (75); The second detection unit (77) is installed on the third connecting pipe (72). The second detection unit (77) is used to detect the composition of the exhaust gas entering the storage tank (71).

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