Hydrogen-oxygen mixed gas system for blast furnace smelting
By designing a hydrogen and oxygen mixture system for blast furnace smelting, the limitations of traditional blast furnace smelting technology in carbon reduction are solved, and a lower-cost hydrogen metallurgy method and efficient carbon emission reduction are achieved.
Patent Information
- Application Number
- CN202421808904.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-30
AI Technical Summary
Traditional blast furnace smelting technology has limitations in reducing carbon, making it difficult to significantly reduce process carbon emissions, and the high cost and high energy consumption of oxygen-rich systems have become bottlenecks.
A hydrogen and oxygen mixture system for blast furnace smelting was designed, and the hydrogen and oxygen mixture was prepared by alkaline electrolyzed water, and then treated by spray cooling and gas-liquid separation system, and directly used for blast furnace smelting. The system eliminates the need for a diaphragm to separate hydrogen and oxygen, reducing investment and energy consumption.
A lower-cost hydrogen metallurgy method has been realized, which improves blast furnace smelting efficiency and effectively reduces carbon dioxide emissions.
Smart Images
Figure CN222821664U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen metallurgy, in particular to a hydrogen-oxygen mixed gas system used for blast furnace smelting. Background Art
[0002] Traditional blast furnace smelting requires oxygen enrichment to improve smelting efficiency. The current blast furnace-converter long process technology has reached its thermodynamic limit, and its carbon reduction space is limited. If the ratio of long and short processes is not adjusted, or there are no disruptive technological breakthroughs such as hydrogen metallurgy, it will be difficult to significantly reduce process carbon emissions. The steel industry urgently needs to gradually reduce carbon dioxide emissions through process optimization innovation and strengthening collaborative innovation with related industries.
[0003] Hydrometallurgy refers to a technology that uses hydrogen (H2) as a reducing agent and fuel to smelt ores. Hydrogen reduces iron ore to produce metallic iron and water, while carbon reduces iron ore to produce metallic iron and CO2. Survival water can be reused, while CO2 emissions are the root cause of global warming, which is why we need to develop hydrogen metallurgy. Utility Model Content
[0004] The utility model aims to provide a hydrogen-oxygen mixed gas system for blast furnace smelting, so as to design a hydrogen metallurgical method with lower cost and reduce the emission of carbon dioxide.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydrogen-oxygen mixed gas system for blast furnace smelting, comprising a hydrogen-oxygen mixed gas generator, a hydrogen-oxygen mixed gas cooling and collecting tower and a gas-liquid separation system, the hydrogen-oxygen mixed gas generator adopts alkaline water electrolysis to produce hydrogen, and its outlet pipe is connected to an alkaline liquid filter, the outlet pipe of the alkaline liquid filter is connected to the lower part of the hydrogen-oxygen mixed gas cooling and collecting tower, a cooling spray device is arranged above the air inlet in the hydrogen-oxygen mixed gas cooling and collecting tower, the upper end outlet of the hydrogen-oxygen mixed gas cooling and collecting tower is connected to the gas-liquid separation system through a hydrogen-oxygen mixed gas pipeline, which is used to remove moisture in the mixed gas, and the mixed gas outlet of the gas-liquid separation system leads to the hydrogen-oxygen mixed gas blast furnace smelting system.
[0006] Preferably, the hydrogen-oxygen mixed gas generating device is composed of several groups of electrolytic cells without diaphragms, each electrolytic cell is correspondingly provided with an alkali solution filter, and the mixed gas generated after the electrolysis of water in each electrolytic cell is transported through the corresponding alkali solution filter to remove the alkali solution, and then combined and transported to the hydrogen-oxygen mixed gas cooling and collection tower.
[0007] Preferably, the above-mentioned hydrogen-oxygen mixed gas system also includes a chilled water system, whose water outlet pipe is connected to a cooling spray device in the hydrogen-oxygen mixed gas cooling and collecting tower to provide cooling water.
[0008] Preferably, a liquid collector is provided at the lower end of the hydrogen-oxygen mixture cooling and collecting tower, and a recovery water pipeline and a discharge water pipeline are connected to the lower end thereof. The outlet of the recovery water pipeline is connected to the hydrogen-oxygen mixture generating device for replenishing electrolytic water, and the discharge water pipeline is used to discharge water exceeding the amount required for electrolysis.
[0009] Preferably, the hydrogen-oxygen mixed gas blast furnace smelting system is provided with a mixed gas injection pipeline, and the hydrogen-oxygen mixed gas dehydrated by the gas-liquid separation system is directly used for blast furnace smelting.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] 1. The hydrogen-oxygen mixed gas system for blast furnace smelting has a simple and reasonable structure. It uses electrolyzed water to prepare the hydrogen-oxygen mixed gas. After spray cooling and dehydration pre-treatment during transportation, it can be directly used in the blast furnace smelting system. It has low cost and can effectively improve the blast furnace smelting efficiency while reducing carbon emissions.
[0012] 2. The hydrogen-oxygen mixed gas system used for blast furnace smelting adopts a hydrogen-oxygen mixed transportation method, so there is no need to set a diaphragm in the electrolyzer to separate hydrogen and oxygen, which helps to reduce investment and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] In the figure: 1. Hydrogen-oxygen mixed gas generating device; 2. Hydrogen-oxygen mixed gas cooling and collecting tower; 3. Chilled water system; 4. Gas-liquid separation system; 5. Hydrogen-oxygen mixed gas blast furnace smelting system; 6. Alkali liquid filter; 7. Hydrogen-oxygen mixed gas pipeline; 8. Recovery water pipeline; 9. Discharge water pipeline. DETAILED DESCRIPTION
[0015] See also Figure 1 A hydrogen-oxygen mixed gas system for blast furnace smelting includes a hydrogen-oxygen mixed gas generating device 1, a hydrogen-oxygen mixed gas cooling and collecting tower 2 and a gas-liquid separation system 4. The hydrogen-oxygen mixed gas generating device 1 produces hydrogen by alkaline water electrolysis, and its gas outlet pipe is connected to an alkaline liquid filter 6, and the gas outlet pipe of the alkaline liquid filter 6 is connected to the lower part of the hydrogen-oxygen mixed gas cooling and collecting tower 2. A cooling spray device is arranged above the air inlet in the hydrogen-oxygen mixed gas cooling and collecting tower 2. For reference, a chilled water system 3 can be arranged outside the tower, and its water outlet pipe is connected to the cooling spray device for providing cooling water; the upper end gas outlet of the hydrogen-oxygen mixed gas cooling and collecting tower 2 is connected to the gas-liquid separation system 4 through a hydrogen-oxygen mixed gas pipeline 7 for removing moisture from the mixed gas, and the mixed gas outlet of the gas-liquid separation system 4 leads to a hydrogen-oxygen mixed gas blast furnace smelting system 5.
[0016] In a preferred embodiment, the hydrogen-oxygen mixed gas generating device 1 can be composed of a plurality of groups of diaphragm-free electrolytic cells, the specific number of which can be determined based on the actual required gas production, and each electrolytic cell can be further provided with a corresponding alkali filter 6. The mixed gas generated after each electrolytic cell electrolyzes water is transported through the corresponding alkali filter 6 to remove the alkali, and then combined and transported to the hydrogen-oxygen mixed gas cooling and collection tower 2.
[0017] In another preferred embodiment, a liquid collector is provided at the lower end of the hydrogen-oxygen mixed gas cooling and collecting tower 2, which is generally in the shape of a funnel;
[0018] Further optionally, the lower end of the liquid collector may be connected to a recovery water pipeline 8 and a discharge water pipeline 9, the water outlet of the recovery water pipeline 8 is connected to the hydrogen-oxygen mixture generating device 1 for replenishing electrolytic water, and the discharge water pipeline 9 is used to discharge water exceeding the amount required for electrolysis. Of course, both pipelines should be provided with safety valves to control the liquid level in the liquid collector to maintain a certain level, and the hydrogen-oxygen mixture generating device 1 may also be provided with other water replenishment methods to avoid insufficient return water from the recovery water pipeline 8.
[0019] In addition, the above-mentioned hydrogen-oxygen mixed gas blast furnace smelting system 5 can generally be provided with a mixed gas injection pipeline, and the hydrogen-oxygen mixed gas dehydrated by the gas-liquid separation system 4 can be directly used for blast furnace smelting. The injection of hydrogen-oxygen mixed gas can not only increase the furnace temperature, improve the blast furnace smelting efficiency, and reduce the emission of harmful gases such as CO2, but also help to reduce the consumption of coke, so that it can replace the oxygen-enriched system of the traditional blast furnace and the hydrogen-enriched system of the new blast furnace; because hydrogen and oxygen are involved and absolute safety must be guaranteed, the hydrogen-oxygen mixed gas blast furnace smelting system 5 should of course also be provided with corresponding safety systems, such as anti-static, anti-backfire and other measures, which are common knowledge in the field and will not be repeated here.
[0020] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.
[0021] The matters not described in detail in the present invention are all known technologies to those skilled in the art.
Claims
1. A hydrogen-oxygen mixed gas system for blast furnace smelting, characterized in that: The invention comprises a hydrogen-oxygen mixed gas generating device (1), a hydrogen-oxygen mixed gas cooling and collecting tower (2) and a gas-liquid separation system (4). The hydrogen-oxygen mixed gas generating device (1) produces hydrogen by alkaline water electrolysis. Its gas outlet pipe is connected to an alkaline liquid filter (6). The gas outlet pipe of the alkaline liquid filter (6) is connected to the lower part of the hydrogen-oxygen mixed gas cooling and collecting tower (2). A cooling spray device is arranged above the gas inlet in the hydrogen-oxygen mixed gas cooling and collecting tower (2). The upper gas outlet of the hydrogen-oxygen mixed gas cooling and collecting tower (2) is connected to the gas-liquid separation system (4) through a hydrogen-oxygen mixed gas pipeline (7) for removing moisture from the mixed gas. The mixed gas outlet of the gas-liquid separation system (4) leads to a hydrogen-oxygen mixed gas blast furnace smelting system (5).
2. The hydrogen-oxygen mixed gas system for blast furnace smelting according to claim 1, characterized in that: The hydrogen-oxygen mixed gas generating device (1) is composed of a plurality of groups of electrolytic cells without diaphragms, each electrolytic cell being provided with a corresponding alkali solution filter (6). After each electrolytic cell electrolyzes water, the mixed gas generated is transported through the corresponding alkali solution filter (6) to remove the alkali solution, and then is combined and transported to the hydrogen-oxygen mixed gas cooling and collecting tower (2).
3. The hydrogen-oxygen mixed gas system for blast furnace smelting according to claim 1, characterized in that: It also includes a chilled water system (3), the water outlet pipe of which is connected to a cooling spray device in the hydrogen-oxygen mixed gas cooling and collecting tower (2) for providing cooling water.
4. The hydrogen-oxygen mixed gas system for blast furnace smelting according to claim 1, characterized in that: A liquid collector is provided at the lower end of the hydrogen-oxygen mixed gas cooling and collecting tower (2), and a recovery water pipeline (8) and a discharge water pipeline (9) are connected to the lower end of the recovery water pipeline (8). The water outlet of the recovery water pipeline (8) is connected to the hydrogen-oxygen mixed gas generating device (1) for replenishing electrolytic water, and the discharge water pipeline (9) is used to discharge water exceeding the amount required for electrolysis.
5. The hydrogen-oxygen mixed gas system for blast furnace smelting according to claim 1, characterized in that: The hydrogen-oxygen mixed gas blast furnace smelting system (5) is provided with a mixed gas injection pipeline, and the hydrogen-oxygen mixed gas dehydrated by the gas-liquid separation system (4) is directly used for blast furnace smelting.