Nitrogen water atomization based emergency cooling protection device for blast furnace cooling wall

Abstract

The utility model provides a kind of nitrogen water atomization-based emergency cooling protection device for blast furnace cooling wall, including cooling water source and nitrogen source;And a Y-type water mist mixing pipeline, Y-type water mist mixing pipeline has a straight pipe section and a with straight pipe section preset angle communication inclined pipe section;Wherein, straight pipe section has a water inlet and a water mist outlet, water inlet is connected with cooling water source, for introducing cooling water;Inclined pipe section has an air inlet, air inlet is connected with nitrogen source, for introducing nitrogen, so that nitrogen is impacted and atomizes cooling water in Y-type water mist mixing pipeline, forms atomized cooling medium;Water mist outlet is used to export atomized cooling medium, and is connected with the original water inlet or water outlet of blast furnace cooling wall that occurs breakage and water leakage.The utility model aims at the case of blast furnace without stopping, carries out safe, efficient emergency cooling to cooling wall that breaks and leaks, to control wall temperature, reduce in-furnace safety risk, and win time for planned maintenance.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace cooling technology in metallurgical equipment, specifically to an emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization. Background Technology

[0002] In the harsh environment of blast furnace smelting, the cooling wall, as a core component ensuring the stability of the furnace structure and the continuity of production, endures high temperatures, high pressures, and material erosion for extended periods. Therefore, the cooling wall is prone to damage due to mechanical wear or thermal stress fatigue, leading to cooling water leakage. Such leaks are often widespread, with large amounts of cooling water directly entering the furnace, causing a series of problems: First, water decomposes at high temperatures to produce hydrogen, causing a sharp increase in the hydrogen content inside the furnace (up to 5%-10%), significantly increasing the risk of gas explosions and potentially causing safety accidents such as water spillage from the taphole; second, the cooling wall loses its effective cooling capacity due to leakage, and the surface temperature of the corresponding area of ​​the furnace shell often rises to 55℃-65℃. If not addressed promptly, this will lead to cooling wall burnout, furnace structural deformation, and ultimately, furnace shutdown and replacement, severely impacting production plans and economic benefits. Existing countermeasures, such as furnace shutdown for maintenance or partial sealing, often suffer from drawbacks such as slow response, complex operation, and production disruption, especially when the furnace is shut down, making effective and safe temperature control of the leaking area difficult. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization.

[0004] The specific technical solution is as follows: An emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization includes: Cooling water source and nitrogen source; and A Y-shaped water mist mixing pipe, wherein the Y-shaped water mist mixing pipe has a straight pipe section and an inclined pipe section connected to the straight pipe section at a preset angle; The straight pipe section has a water inlet and a water mist outlet. The water inlet is connected to the cooling water source for introducing cooling water. The inclined pipe section has an air inlet connected to the nitrogen source for introducing nitrogen gas, which impacts and atomizes the cooling water in the Y-shaped water mist mixing pipe to form an atomized cooling medium. The water mist outlet is used to discharge the atomized cooling medium and connects to the original water inlet or outlet of the blast furnace cooling wall that has been damaged and leaking water.

[0005] Optionally, the angle between the inclined pipe section and the straight pipe section is 45 degrees.

[0006] Optionally, flow meters and manual flow control ball valves are also included, respectively installed on the pipelines used to transport cooling water and nitrogen, for monitoring and regulating the flow rates of cooling water and nitrogen.

[0007] Optionally, the cooling water source, nitrogen source, and Y-shaped water mist mixing pipe are flexibly connected by a metal flexible hose.

[0008] Optionally, a pressure relief port is provided on the straight section of the Y-shaped water mist mixing pipe between the connection point of the inclined pipe section and the water mist outlet.

[0009] Optionally, the Y-shaped water mist mixing pipe is made of high-pressure resistant and corrosion-resistant stainless steel.

[0010] Optionally, the manual flow control ball valve is used to adjust the flow ratio of cooling water to nitrogen in response to temperature changes in the blast furnace cooling wall.

[0011] Optionally, the flow ratio of cooling water to nitrogen is 1:20 to 1:35 under high temperature conditions and 1:18 to 1:25 under low temperature conditions.

[0012] Optionally, the device is configured to operate under conditions of cooling water pressure of 1.6 MPa and nitrogen pressure of 0.9 MPa.

[0013] Optionally, the device may comprise multiple sets, each set of which may be independently or jointly connected to the inlet or outlet of one or more damaged cooling walls.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This device uses a specially designed Y-shaped pipe to force high-pressure nitrogen gas to impact the water flow at high speed, breaking it into micron-sized droplets. After atomization, the specific surface area of ​​the cooling medium increases by more than 300%, greatly improving the heat exchange efficiency with the inner wall of the cooling system and increasing heat dissipation capacity by more than 2 times. This device uses a mist-like medium for cooling, significantly reducing the amount of liquid water entering the furnace. Practical application shows that the hydrogen content inside the furnace can be stably reduced from the dangerous 5%-8% range to a safe 3%-4% range, effectively curbing the risk of detonation and taphole dripping. After the device was put into use, the furnace shell surface temperature corresponding to the leakage area dropped significantly from 55-65℃ and stabilized at 45-50℃, effectively preventing the cooling wall from burning due to overheating. Subsequent inspection also confirmed that the cooling wall protected by this method showed no signs of burning. In addition, the device is equipped with a flow meter and a manual control valve, which can dynamically adjust the water-nitrogen ratio in real time according to the furnace shell temperature feedback to adapt to different operating conditions. Its compact structure and convenient installation enable rapid deployment without shutting down the furnace, saving valuable time for planned maintenance and ensuring the continuity of production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a single unit device of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the multiple devices of this utility model.

[0017] In the diagram: 101, cooling water source; 102, nitrogen source; 103, flow meter; 104, metal hose; 105, Y-type water mist mixing pipe; 106, manual flow control ball valve; 107, straight pipe section; 108, inclined pipe section; 109, pressure relief port. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0021] Reference Figures 1-2 This embodiment discloses an emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization. The device (single unit) includes: Cooling water source 101 and nitrogen source 102; and A Y-shaped water mist mixing pipe 105 has a straight pipe section 107 and an inclined pipe section 108 connected to the straight pipe section 107 at a preset angle. The straight pipe section 107 has a water inlet and a water mist outlet. The water inlet is connected to the cooling water source 101 to introduce cooling water. The inclined pipe section 108 has an air inlet connected to the nitrogen source 102 to introduce nitrogen, so that the nitrogen impacts and atomizes the cooling water in the Y-shaped water mist mixing pipe 105 to form an atomized cooling medium. The water mist outlet is used to discharge the atomized cooling medium and connects to the original water inlet or outlet of the blast furnace cooling wall that has been damaged and leaked.

[0022] Specifically, in this embodiment, a cooling water tank serves as the cooling water source 101, and a nitrogen tank serves as the nitrogen source 102. The outlet pipes of the cooling water tank and the nitrogen tank ultimately converge into a Y-shaped water mist mixing pipe 105, which is made of high-pressure resistant and corrosion-resistant stainless steel. The specific connection structure is as follows: the outlet of the cooling water tank is connected via a pipe to the water inlet end of the straight section 107 of the Y-shaped water mist mixing pipe 105; the outlet of the nitrogen tank is connected via a pipe to the air inlet end of the inclined section 108 of the Y-shaped water mist mixing pipe 105. Manual flow control ball valves 106 and flow meters 103 are respectively installed on the cooling water and nitrogen pipes for precise control and monitoring of the flow rates of the two media. Flexible connections between the various parts can be made using metal hoses 104 to adapt to complex on-site installation environments. The outlet end of the straight section 107 of the Y-shaped water mist mixing pipe 105 serves as the water mist outlet and is connected to the original water inlet or outlet of the damaged cooling wall via a metal hose 104.

[0023] In addition, a pressure relief port 109 can be installed on the straight section 107 of the Y-shaped pipeline for inspection and maintenance.

[0024] The inclined tube section 108 and the straight tube section 107 are connected non-axisily at a specific angle (preferably 45°). When high-pressure nitrogen gas (e.g., 0.9 MPa) is injected at high speed from the inclined tube section 108, it will exert a strong shearing and impact effect on the cooling water flowing in the straight tube section 107 (e.g., 1.6 MPa), thereby forcibly breaking the liquid water into micron-sized droplets, forming a highly dispersed atomized cooling medium.

[0025] like Figure 2 As shown, when a large area of ​​the cooling wall leaks water, multiple sets of this device can be deployed in parallel, each corresponding to a different inlet and outlet of the damaged cooling wall, to achieve comprehensive coverage and coordinated cooling of the entire high-temperature area.

[0026] When connecting this device, firstly, connect the water mist outlet of the device to the original water inlet or outlet of the damaged blast furnace cooling wall; turn on the cooling water source 101 and nitrogen source 102, so that the cooling water enters from the straight pipe section 107 and the high-pressure nitrogen is injected at high speed from the inclined pipe section 108; in the Y-shaped water mist mixing pipe 105, the high-pressure nitrogen gas flow impacts and breaks the water flow to form a mist-like cooling medium; the mist-like cooling medium is introduced into the inner cavity of the damaged cooling wall for heat absorption and cooling; after heat exchange, the gaseous mixed medium is directly discharged into the blast furnace through the damaged part of the cooling wall. During operation, the valve is opened, and cooling water is controlled to enter the straight pipe section 107 at a pressure of approximately 1.6 MPa. Simultaneously, nitrogen gas is controlled to be injected at high speed from the inclined pipe section 108 at a pressure of approximately 0.9 MPa. Due to the inclined design of the inclined pipe section 108, the high-speed nitrogen gas flow violently impacts and shears the water flow in the straight pipe section 107 in an asymmetric manner, forcibly breaking and atomizing the water into micron-sized droplets. These atomized cooling media are then transported to the inner cavity of the damaged cooling wall, where they efficiently absorb heat and rapidly cool down by utilizing their large specific surface area. After heat exchange is completed, the medium becomes a mixture of high-temperature steam and nitrogen gas, which is directly discharged into the blast furnace through the original damaged cracks in the cooling wall, achieving a unified cooling and exhaust process.

[0027] During operation, operators can monitor real-time data on the furnace shell temperature or the cooling wall body temperature and adjust the manual flow control ball valves 106 on the cooling water and nitrogen pipelines to dynamically optimize the water-nitrogen flow ratio. For example, under high heat load conditions, the water-nitrogen ratio can be adjusted to 1:20 to 1:35; under low heat load conditions, it can be adjusted to 1:18 to 1:25. This aims to ensure that the mixed medium always maintains optimal atomization cooling while minimizing the amount of liquid water entering the furnace, achieving a balance between safety and efficiency.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization, characterized in that, include: Cooling water source and nitrogen source; and A Y-shaped water mist mixing pipe, wherein the Y-shaped water mist mixing pipe has a straight pipe section and an inclined pipe section connected to the straight pipe section at a preset angle; The straight pipe section has a water inlet and a water mist outlet. The water inlet is connected to the cooling water source for introducing cooling water. The inclined pipe section has an air inlet connected to the nitrogen source for introducing nitrogen gas, which impacts and atomizes the cooling water in the Y-shaped water mist mixing pipe to form an atomized cooling medium. The water mist outlet is used to discharge the atomized cooling medium and connects to the original water inlet or outlet of the blast furnace cooling wall that has been damaged and leaking water.

2. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 1, characterized in that, The angle between the inclined pipe section and the straight pipe section is 45 degrees.

3. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 1, characterized in that, It also includes flow meters and manual flow control ball valves installed on the pipelines used to transport cooling water and nitrogen, respectively, for monitoring and regulating the flow rates of cooling water and nitrogen.

4. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 1, characterized in that, The cooling water source, nitrogen source, and Y-shaped water mist mixing pipe are flexibly connected by a metal flexible hose.

5. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 1, characterized in that, On the straight section of the Y-shaped water mist mixing pipe, a pressure relief port is provided between the connection point of the inclined pipe section and the water mist outlet.

6. The emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization according to claim 1, characterized in that, The Y-shaped water mist mixing pipe is made of high-pressure resistant and corrosion-resistant stainless steel.

7. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 3, characterized in that, The manual flow control ball valve is used to adjust the flow ratio of cooling water to nitrogen in response to temperature changes in the blast furnace cooling wall.

8. The emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization according to claim 7, characterized in that, The flow ratio of cooling water to nitrogen is 1:20 to 1:35 under high temperature conditions and 1:18 to 1:25 under low temperature conditions.

9. The emergency cooling protection device for blast furnace cooling walls based on nitrogen water atomization according to claim 1, characterized in that, The device is configured to operate under conditions of cooling water pressure of 1.6 MPa and nitrogen pressure of 0.9 MPa.

10. The emergency cooling protection device for blast furnace cooling walls based on nitrogen-water atomization according to claim 1, characterized in that, The device comprises multiple sets, each set of which is independently or jointly connected to the inlet or outlet of one or more damaged cooling walls.

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