Device for smelting stainless steel by using carbon dioxide

Abstract

The invention belongs to the technical field of steel smelting devices, and relates to a device for smelting stainless steel by using carbon dioxide, which comprises a steelmaking furnace, a furnace cover is arranged at the top of the steelmaking furnace, an eddy current coil is arranged on the inner wall of the steelmaking furnace, an air outlet pipe is led out of one side of the steelmaking furnace and connected to a catalytic box, and a connecting pipe is led out of the catalytic box and connected to an air inlet pipe. The gas inlet pipe is connected with the reaction furnace, the reaction furnace is connected with the steelmaking furnace through a gas supply pipe, and a gas pump is arranged at the top of the reaction furnace and provided with a gas suction pipe connected with the top of the reaction furnace. According to the method, carbon dioxide is subjected to catalytic reduction and then participates in the metal smelting process again, emission of carbon dioxide is reduced, cyclic utilization of resources is promoted, the carbon footprint in the smelting process is reduced, and double improvement of economic benefits and environmental benefits is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting devices, and in particular relates to a device for smelting stainless steel using carbon dioxide. Background Art

[0002] In modern industry, stainless steel is widely used in construction, automobiles, home appliances, medical and other fields due to its excellent corrosion resistance and strength. The traditional stainless steel smelting process mainly relies on high-temperature arc furnaces or converters, usually using hydrocarbons or coal gas as reducing agents, which has certain limitations in terms of energy consumption, environmental pollution and production efficiency.

[0003] As global environmental awareness increases, carbon dioxide emissions as a greenhouse gas are receiving increasing attention. Traditional smelting processes use a large amount of fossil fuels, the combustion of which releases a large amount of carbon dioxide, exacerbating global warming. Therefore, it is particularly important to develop low-carbon or zero-emission smelting technologies.

[0004] Based on this, the technology of using carbon dioxide for stainless steel smelting came into being. Its core concept is to catalytically reduce carbon dioxide and then re-involve it in the metal smelting process. This not only reduces carbon dioxide emissions and promotes the recycling of resources, but also helps to reduce the carbon footprint of the smelting process, achieving a dual improvement in economic and environmental benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a device for smelting stainless steel using carbon dioxide, which has the function of smelting stainless steel using carbon dioxide and solves the problems of insufficient carbon dioxide utilization and high carbon dioxide emissions in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the present invention provides a device for smelting stainless steel using carbon dioxide, including a steelmaking furnace, a furnace cover is arranged on the top of the steelmaking furnace, an eddy current coil is arranged on the inner wall of the steelmaking furnace, an air outlet pipe is led out from one side of the steelmaking furnace, the air outlet pipe is connected to a catalyst box, a connecting pipe is led out from the catalyst box and connected to an air inlet pipe, the air inlet pipe is connected to a reaction furnace, the reaction furnace is connected to the steelmaking furnace through an air supply pipe, an air pump is arranged on the top of the reaction furnace, and an exhaust pipe is arranged on the air pump to connect to the top of the reaction furnace.

[0007] Specifically, the furnace cover is connected to one side of the top of the steelmaking furnace through a hinge mechanism, and a handle is provided on one side of the top of the furnace cover.

[0008] Specifically, an exhaust pipe is arranged on the top of the furnace cover, and an opening and closing mechanism and a filter screen are arranged inside the exhaust pipe.

[0009] Specifically, a bracket is arranged at the bottom of the reaction furnace, and a base is arranged at the bottom of the bracket.

[0010] Specifically, a valve is provided at the end of the trachea.

[0011] Specifically, the eddy current coil is made of highly conductive material, and the layout of the eddy current coil is designed to be spiral.

[0012] Specifically, multiple layers of catalyst are arranged in the catalyst box.

[0013] Specifically, a filtering device is arranged in the air outlet pipe.

[0014] A method for using a device for smelting stainless steel using carbon dioxide comprises the following steps:

[0015] a. Add an appropriate amount of stainless steel raw materials into the steelmaking furnace and heat them to a molten state through an eddy current coil;

[0016] b. Collect carbon dioxide gas during the molten metal smelting process through the gas outlet pipe and transport it to the catalyst box;

[0017] c. Converting carbon dioxide through a catalyst in a catalytic box to generate reusable gas;

[0018] d. The converted gas is introduced into the reactor through the gas inlet pipe, and then further purified and reacted in the reactor before being sent to the steelmaking furnace;

[0019] e. Control the gas flow rate and pressure in the reactor through the air pump to optimize the reaction conditions.

[0020] Specifically, in step c, the amount of catalyst used is adjusted according to the reaction time and the required alloy composition.

[0021] Specifically, in step e, the operating parameters of the air pump are dynamically adjusted by real-time monitoring of the temperature and pressure in the reaction furnace.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] 1. The present invention catalytically reduces carbon dioxide and then re-incorporates it into the metal smelting process, which not only reduces carbon dioxide emissions and promotes the recycling of resources, but also helps to reduce the carbon footprint of the smelting process, thereby achieving a dual improvement in economic and environmental benefits;

[0024] 2. The present invention has the function of utilizing carbon dioxide to smelt stainless steel, thus solving the problems of insufficient carbon dioxide utilization and high carbon dioxide emission in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a three-dimensional structural diagram of a device for smelting stainless steel using carbon dioxide;

[0027] Figure 2 It is a three-dimensional structural diagram of a device for smelting stainless steel using carbon dioxide from other angles;

[0028] In the above figures, 1. steelmaking furnace, 2. furnace cover, 3. hinge mechanism, 4. exhaust pipe, 5. handle, 6. eddy current coil, 7. outlet pipe, 8. catalyst box, 9. connecting pipe, 10. inlet pipe, 11. reaction furnace, 12. air supply pipe, 13. bracket, 14. base, 15. air pump, 16. exhaust pipe, 17. valve. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0031] Embodiment 1, as Figure 1-2 As shown, a device for smelting stainless steel using carbon dioxide includes a steelmaking furnace 1, which is used to heat and melt stainless steel raw materials to make them molten, so as to facilitate subsequent reactions and treatments. A furnace cover 2 is arranged on the top of the steelmaking furnace 1, which is used to close the steelmaking furnace 1 to prevent heat loss and control the gas in the furnace to avoid loss. The inner wall of the steelmaking furnace 1 is provided with an eddy current coil 6, which heats the stainless steel raw materials in the steelmaking furnace 1 by electromagnetic induction.

[0032] An outlet pipe 7 is led out from one side of the steelmaking furnace 1, and the outlet pipe 7 is used to collect the carbon dioxide gas in the steelmaking furnace 1 and transport it to the catalyst box 8. The outlet pipe 7 is connected to the catalyst box 8, and the catalyst box 8 uses a multi-layer catalyst to convert carbon dioxide to generate reusable gas, such as carbon monoxide, to promote recycling, reduce emissions, and improve resource utilization. A connecting pipe 9 is led out of the catalyst box 8 and connected to the intake pipe 10. The connecting pipe 9 connects the catalyst box 8 with the intake pipe 10 to transport the catalyzed gas and ensure the smooth flow of the gas.

[0033] The air inlet pipe 10 is connected to the reaction furnace 11, and the reaction furnace 11 further purifies and processes the converted gas to make it suitable for participating in the smelting process again. By accurately controlling the temperature and pressure, the reaction conditions of the gas are optimized to ensure the maximum conversion efficiency. The air inlet pipe 10 provides a gas source for the reaction furnace 11 to ensure the continuation of the entire reaction process. The reaction furnace 11 is connected to the steelmaking furnace 1 through the air delivery pipe 12. The air delivery pipe 12 connects the reaction furnace 11 and the steelmaking furnace 1 to transport the processed gas back to the steelmaking furnace 1, ensuring the recycling of the gas, reducing the demand for external gas, and reducing production costs.

[0034] An air pump 15 is provided on the top of the reaction furnace 11. The air pump 15 can pump gas and optimize reaction conditions and improve smelting efficiency by dynamically adjusting the flow rate and pressure. An exhaust pipe 16 is provided on the air pump 15 to connect to the top of the reaction furnace 11. The air pump 15 can pump external air into the reaction furnace 11 through the exhaust pipe 16. The valve 17 controls the opening and closing of the exhaust pipe 16.

[0035] The following is a detailed description of the design of the above key components:

[0036] The furnace cover 2 is connected to one side of the top of the steelmaking furnace 1 through a hinge mechanism 3. The hinge mechanism 3 allows the furnace cover 2 to be flexibly opened and closed for easy maintenance and cleaning. A handle 5 is provided on one side of the top of the furnace cover 2. The handle 5 on the top of the furnace cover 2 facilitates the operator to safely open and close the furnace cover 2.

[0037] The top of the furnace cover 2 is provided with an exhaust pipe 4, and an opening and closing mechanism and a filter are provided inside the exhaust pipe 4. The exhaust pipe 4 is used to discharge excess gas in the furnace to prevent the internal pressure from being too high. The opening and closing mechanism and the filter can control the emission of gas and filter large particles to protect the environment. The exhaust pipe 4 can not only exhaust gas, but also ventilate the inside of the steelmaking furnace 1.

[0038] The bottom of the reaction furnace 11 is provided with a bracket 13, which supports the reaction furnace 11 so that it can be stably placed on a base 14. The bottom of the bracket 13 is provided with a base 14, which has complex bearing and support functions to keep the device stable.

[0039] A valve 17 is provided at the end of the air extraction pipe 16. The valve 17 regulates the opening and closing of the air extraction pipe 16, which helps to optimize the reaction conditions.

[0040] The eddy current coil 6 is made of highly conductive material to improve heating efficiency. The layout design of the eddy current coil 6 is spiral, which helps to heat evenly and prevent local overheating.

[0041] The catalytic box 8 is provided with multiple layers of catalyst. For example, in industrial production, the commonly used catalyst is an iron-based catalyst, also known as a Fischer-Tropsch catalyst, which is composed of iron and carbon and can catalyze the reaction of C and CO2 at high temperature and high pressure. The reaction is carried out in the catalytic box 8, and the gas in the catalytic box 8 reacts through the catalyst bed to generate compounds such as CO and H2. The gas temperature in the catalytic box 8 is generally between 800-1000°C, and the pressure is between 1-5MPa. In addition, the catalyst can refer to the introduction in Patent No. 202210341469.6, and an electrocatalytic scheme is used to convert carbon dioxide into carbon monoxide.

[0042] The outlet pipe 7 is provided with a filter device, which filters the gas in the outlet pipe 7 to ensure that the drawn-out gas is clean and avoids contamination of the catalyst, thereby facilitating the subsequent reuse of carbon dioxide.

[0043] Example 2, a method for using the device for smelting stainless steel using carbon dioxide as shown in Example 1, comprising the following steps:

[0044] a. Add an appropriate amount of stainless steel raw material into the steelmaking furnace 1 and heat it to a molten state through the eddy current coil 6;

[0045] The stainless steel raw materials include iron ore, ferrochrome, ferronickel, etc. The eddy current coil 6 disposed on the inner wall of the steelmaking furnace 1 generates an electromagnetic field, and the stainless steel raw materials are heated by the eddy current effect. The highly conductive material and spiral design of the eddy current coil 6 ensure uniformity and high efficiency of heating. As the temperature rises, the stainless steel raw materials gradually melt and form a liquid.

[0046] b. Collecting carbon dioxide gas during the molten metal smelting process through the gas outlet pipe 7 and transporting it to the catalyst box 8;

[0047] During the melting process of the stainless steel raw material, carbon dioxide gas is generated, and the carbon dioxide gas introduced is collected through the outlet pipe 7 on one side of the steelmaking furnace 1. The collected gas is transported to the catalyst box 8 through the outlet pipe 7 to prepare for the next conversion process. In the catalyst box 8, the carbon dioxide is converted by the catalyst to generate reusable gas;

[0048] c. In the catalytic box 8, the carbon dioxide gas undergoes a conversion reaction through the action of the catalyst to generate reusable gas, such as carbon monoxide (CO) or hydrogen (H2), etc. In step c, the amount of the catalyst used is adjusted according to the reaction time and the required alloy composition to ensure the effective conversion of carbon dioxide and the quality of the final alloy;

[0049] d. The converted gas is introduced into the reaction furnace 11 through the air inlet pipe 10, and is further purified by the reaction furnace 11 and then sent to the steelmaking furnace 1;

[0050] The converted gas is introduced into the reaction furnace 11 through the air inlet pipe 10 and continues to participate in the smelting process. In the reaction furnace 11, the gas is further processed by the purification device inside the reaction furnace 11 to optimize the gas composition. The purification device can be a material that can adsorb gas, such as using active calcium oxide to adsorb carbon dioxide that is not completely catalyzed. The purified gas is sent back to the steelmaking furnace 1 to be used as a reducing agent or to participate in the smelting reaction, forming a recycling process.

[0051] e. The gas flow rate and pressure in the reaction furnace 11 are controlled by the air pump 15 to optimize the reaction conditions.

[0052] In step e, the operating parameters of the air pump 15 are dynamically adjusted by real-time monitoring of the temperature and pressure in the reaction furnace 11. The air pump 15 controls the gas flow rate and pressure in the reaction furnace 11 to optimize the reaction conditions, and the temperature and pressure in the reaction furnace 11 are monitored in real time. These data are used to dynamically adjust the operating parameters of the air pump 15 to ensure the stability and efficiency of the smelting process.

[0053] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art. It will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A device for smelting stainless steel using carbon dioxide, characterized in that: It includes a steelmaking furnace, a furnace cover is arranged on the top of the steelmaking furnace, an eddy current coil is arranged on the inner wall of the steelmaking furnace, an air outlet pipe is led out from one side of the steelmaking furnace, the air outlet pipe is connected to the catalyst box, a connecting pipe is led out from the catalyst box and connected to the air inlet pipe, the air inlet pipe is connected to the reaction furnace, the reaction furnace is connected to the steelmaking furnace through an air supply pipe, an air pump is arranged on the top of the reaction furnace, and an air extraction pipe is arranged on the air pump to connect to the top of the reaction furnace.

2. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: The furnace cover is connected to one side of the top of the steelmaking furnace through a hinge mechanism, and a handle is arranged on one side of the top of the furnace cover.

3. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: An exhaust pipe is arranged on the top of the furnace cover, and an opening and closing mechanism and a filter screen are arranged inside the exhaust pipe.

4. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: A bracket is arranged at the bottom of the reaction furnace, and a base is arranged at the bottom of the bracket.

5. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: A valve is arranged at the end of the trachea.

6. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: The eddy current coil is made of highly conductive material, and the layout of the eddy current coil is designed to be spiral.

7. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: Multiple layers of catalyst are arranged in the catalyst box.

8. The device for smelting stainless steel using carbon dioxide according to claim 1, characterized in that: A filtering device is arranged in the air outlet pipe.

9. A method for using a device for smelting stainless steel using carbon dioxide according to any one of claims 1 to 8, characterized in that: The following steps are involved: a. Add an appropriate amount of stainless steel raw materials into the steelmaking furnace and heat them to a molten state through an eddy current coil; b. Collect carbon dioxide gas during the molten metal smelting process through the gas outlet pipe and transport it to the catalyst box; c. Converting carbon dioxide through a catalyst in a catalytic box to generate reusable gas; d. The converted gas is introduced into the reactor through the gas inlet pipe, and then further purified and reacted in the reactor before being sent to the steelmaking furnace; e. Control the gas flow rate and pressure in the reactor through the air pump to optimize the reaction conditions.

10. The method for using the device for smelting stainless steel using carbon dioxide according to claim 9, characterized in that: In step c, the amount of catalyst used is adjusted according to the reaction time and the required alloy composition. In step e, the operating parameters of the air pump are dynamically adjusted by real-time monitoring of the temperature and pressure in the reactor.

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