High-temperature-resistant measurement and control integrated valve for blast furnace hot air uniform regulation

Abstract

The utility model discloses high furnace valve field discloses a high temperature resistant measurement and control integrated valve for blast furnace hot air uniform regulation and control, the utility model discloses a valve body outer layer adopts high strength heat -resistant alloy, and the compressive strength is not less than 200MPa, can directly resist the scouring and pressure impact of blast furnace hot air, the inner layer is micropore alumina heat insulation layer, and the thermal conductivity is not higher than 0.15W / (m K), and the heat conduction to sealing area and actuator is reduced greatly. The outer layer provides mechanical protection, the inner layer provides heat shield, and the temperature of two layers common valve stem packing and actuator end is reduced 120-150 DEG C, makes sealing material keep elasticity, prolongs the service life, and the traditional radiating fin is saved.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace valves, specifically to a high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnaces. Background Technology

[0002] The blast furnace blast system is a crucial component of blast furnace ironmaking, and its stability and reliability directly impact the blast furnace's production efficiency and molten iron quality. Traditional blast furnace blast systems suffer from uneven blast parameters between tuyeres due to variations in branch pipe paths and furnace pressure. Furthermore, the lack of real-time control mechanisms for these parameters makes it difficult to meet the demands of modern blast furnace production for balanced combustion and intelligent control. Additionally, traditional metal valves, with a temperature resistance below 800℃, struggle to handle 1200℃ hot blast, resulting in decreased sealing and wear resistance at high temperatures. Non-metallic materials lack sufficient strength, and specialized materials are expensive. While water-cooled designs offer high-temperature resistance, they increase heat loss. Moreover, the compact space between the hot blast branch pipes in the blast furnace makes traditional flow meters and valves bulky and difficult to integrate with monitoring and control functions. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of insufficient sealing and wear resistance at high temperatures, and to provide a high-temperature resistant integrated valve for uniform control of hot blast in blast furnaces.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnace includes a valve body, a flow channel inside the valve body, a valve seat inside the flow channel, a ball valve on the valve seat, and through holes facing each other on the valve body. The lower valve stem and the upper valve stem pass through the two through holes and are fixedly connected to the ball valve. Both the lower valve stem and the upper valve stem are sealed to the valve seat. The upper valve stem is connected to the actuator. A further improvement of this invention is that the valve body has a double-layer composite structure, with the outer layer of the valve body having a compressive strength ≥200 MPa and the inner layer of the valve body having a thermal conductivity ≤0.15 W / (m·K).

[0005] A further improvement of this utility model is that the outer layer of the valve body is an A105 carbon steel layer, and the inner layer of the valve body is a ceramic fiber heat insulation layer.

[0006] A further improvement of this invention is that the inner wall of the valve body is covered with an Al2O3-TiC coating containing microcapsules.

[0007] A further improvement of this utility model is that the ball valve is a 995 alumina ceramic ball valve, and the 995 alumina ceramic ball valve is wrapped with a valve core sleeve.

[0008] A further improvement of this utility model is that the valve seat is made of 995 alumina or Y-TZP.

[0009] A further improvement of this utility model is that a stuffing box is provided between the upper valve stem and the valve seat, and the stuffing box is filled with packing material.

[0010] A further improvement of this invention is that the upper valve stem and the actuator are connected by a disc spring.

[0011] A further improvement of this invention is that the disc spring outer sleeve is provided with a heat dissipation connecting sleeve.

[0012] A further improvement of this utility model is that a pressure transmitter, a temperature transmitter, and a flow transmitter are provided on the valve body, and the pressure transmitter, temperature transmitter, and flow transmitter are all connected to the actuator.

[0013] A further improvement of this invention is that the probes of the pressure transmitter, temperature transmitter, and flow transmitter are located upstream of the ball valve.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The outer layer of this valve body is made of a high-strength heat-resistant alloy with a compressive strength of not less than 200MPa, which can directly resist the scouring and pressure impact of hot blast from the blast furnace. The inner layer is a microporous alumina insulation layer with a thermal conductivity of not more than 0.15W / (m·K), which significantly reduces heat conduction to the sealing area and actuator. The outer layer provides mechanical protection, and the inner layer provides thermal shielding. Together, the two layers reduce the temperature of the valve stem packing and actuator end by 120–150°C, keeping the sealing material elastic, extending its service life, and eliminating the need for traditional heat sinks. In this invention, the upper and lower valve stems coaxially pass through the valve body and are rigidly fixed to the ball. The valve seat is maintained by an axially preloaded disc spring assembly. Symmetrical drive eliminates the eccentricity caused by unilateral torque, ensuring that the ball rotates without wobbling, the opening and closing torque fluctuation is less than 5%, zero leakage can be achieved at any angle, the actuator load is more balanced, and the opening and closing time is shortened by about 15% compared to traditional single-stem ball valves. In conclusion, this invention enables the valve to maintain an ANSI Class VI zero-leakage seal under long-term blast furnace hot blast conditions; increases the wear resistance life of the sealing surface by 2–3 times; extends the maintenance cycle from the traditional six months to two years; and reduces overall maintenance time by approximately 50%. This valve allows for long-term, safe, and uniform control of blast furnace hot blast, providing a reliable guarantee for the stability and energy efficiency of blast furnace injection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the present invention; Figure 3 This is a schematic diagram showing the cooperation between the upper valve stem and the actuator in this utility model; The components are as follows: 1. Valve body; 2. Bottom cover; 3. Sealing gasket; 4. Heat insulation gasket; 5. Lower valve stem; 6. Heat insulation layer; 7. Valve seat; 8. Ball valve; 9. Valve body liner; 10. Upper valve stem; 11. Stuffing gland; 12. Packing; 13. Gland; 14. Heat dissipation connecting sleeve; 15. Actuator; 16. Pressure transmitter; 17. Temperature transmitter; 18. Flow transmitter. Detailed Implementation

[0016] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.

[0017] See Figure 1 , Figure 2 and Figure 3 This high-temperature resistant integrated valve for uniform control of hot blast in blast furnaces includes a valve body 1. A flow channel is formed within the valve body 1, and a valve seat 7 is installed within the flow channel. A ball valve 8 is mounted on the valve seat 7. Through holes are formed on the valve body 1, through which a lower valve stem 5 and an upper valve stem 10 pass and are fixedly connected to the ball valve 8. Both the lower valve stem 5 and the upper valve stem 10 are sealed to the valve seat 7. The upper valve stem 10 is connected to an actuator 15. The valve body 1 has a double-layer composite structure. The outer layer is 12mm thick A105 carbon steel, providing a compressive strength of over 200MPa to ensure the mechanical stability of the valve body under high temperature and high pressure conditions. The inner layer is a 125mm thick ceramic fiber insulation layer with a thermal conductivity ≤0.15W / (m·K), effectively blocking heat transfer to the outside. The inner wall of the valve body 1 is coated with an Al2O3-TiC coating containing microcapsules, which can automatically repair surface defects at high temperatures, improving wear resistance and extending service life.

[0018] The valve body 1 houses a ball valve 8 and a valve core sleeve. The ball valve 8, made of 995 alumina ceramic, is installed within the valve core sleeve. Through this sleeved valve core design, the valve stem and the high-temperature medium are insulated by the double layer of heat from the ball valve 8 and the valve seat sleeve, effectively reducing heat transfer from the medium to the valve stem, minimizing damage to the equipment from high temperatures, and enhancing insulation. The precise fit between the ball valve 8 and the valve core sleeve enables the valve's opening and closing functions as well as flow regulation.

[0019] The valve seat 7 is made of high-temperature resistant ceramics such as 995 alumina or Y-TZP. It has high hardness and good pressure resistance under high temperature conditions above 1300℃, ensuring that the valve seat 7 has good sealing performance and durability under the scouring of high temperature media.

[0020] The upper valve stem 10 and lower valve stem 5 are vertically inserted into both sides of the valve body, connecting with the valve seat and ball valve 8. The upper valve stem 10 is connected to the actuator 15, responsible for transmitting the drive signal. Both valve stems are made of high-temperature resistant ZR2474 or GH2747 material to ensure mechanical strength and stability in high-temperature environments. A special sealing structure is designed at the connection between the valve stem and the valve body 1. The outer stuffing box 11 is made of high-temperature resistant stainless steel, with a high-temperature resistant fiber gasket at the bottom serving as packing 12. The top of the stuffing box 11 is sealed by a gland 13 and supported by a disc spring to accommodate the differences in the expansion coefficients of different metals at high temperatures, ensuring sealing performance. A heat insulation layer is also provided between the valve stem and the stuffing box 11 to reduce the heat absorbed by the stuffing box, thereby reducing the impact on the medium's heat dissipation. Furthermore, the upper valve stem 10 is heightened and equipped with a heat dissipation connecting sleeve 14 with a large disc, effectively reducing the temperature of the actuator 15, ensuring its operational performance, and further improving the valve's reliability and service life. Pressure transmitter 16, temperature transmitter 17, and flow transmitter 18 are installed at different positions on valve body 1 to monitor the flow rate, pressure, and temperature parameters of the medium in real time. Flow transmitter 18 is fixed to the measuring section at the bottom of the valve body, perpendicular to the wall of valve body 1. It has a four-electrode induction array embedded inside and is covered with a 995 alumina ceramic insulating sleeve (temperature resistant 1600℃, thickness 2mm). It measures the medium flow rate through high-frequency AC charge induction (frequency 10kHz) and combines orthogonal demodulation technology to eliminate medium-charged interference, achieving a flow measurement accuracy of up to ±1.5%, providing real-time data for the control system. Pressure transmitter 16 and temperature transmitter 17 are located on the side of the valve body. The probes are arranged downstream of the flow measurement unit and radially distributed along the flow channel. The composite probe is a slender cylinder with a diameter of 8 mm and a length of 150 mm, covered by a double-layer tantalum metal protective cover. Internally, it integrates a sapphire fiber optic pressure sensor and a type B tungsten-rhenium thermocouple, which can simultaneously measure the medium pressure (range 0-2 MPa, accuracy ±0.2% FS) and temperature (range 0-1600℃, accuracy ±1.5℃), providing key parameters for the intelligent control system and ensuring the accuracy of regulation. By integrating the high-temperature resistant flow transmitter 18, temperature transmitter 17, pressure transmitter 16, actuator 15, and valve body into one unit, the overall equipment length is shortened, and the structure is more compact.

[0021] The actuator 15 is mounted on top of the valve body, with the valve stem arranged perpendicular to the flow channel axis. Its main components include a high-temperature resistant stepper motor, a magnetically coupled non-contact transmission device, and a 995 alumina ceramic ball valve 8. The stepper motor can operate stably at 200℃, and the valve core is matched to the flow channel diameter. The stepper motor is connected to the valve stem via a magnetic coupling device, and the lower end of the valve stem is fixed to the valve core. The valve core slides within the valve core sleeve. According to control commands, the valve core is driven to move (opening resolution 0.1°), adjusting the flow channel opening, thereby achieving precise control of the medium flow rate and pressure.

[0022] When the medium enters from upstream, it first passes through the measurement section. Flow transmitter 18, pressure transmitter 16, and temperature transmitter 17 collect real-time data, which is then transmitted to the control unit. The control unit performs calculations based on preset values ​​and feedback signals, driving actuator 15 to adjust the opening of ball valve 8, thus achieving closed-loop control and ensuring the stability of flow and pressure under high-temperature conditions.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A high-temperature resistant integrated valve for uniform control of hot blast in blast furnaces, characterized in that, Includes a valve body (1), a flow channel is provided inside the valve body (1), a valve seat (7) is provided inside the flow channel, a ball valve (8) is provided on the valve seat (7), and through holes are provided opposite to each other on the valve body (1). The lower valve stem (5) and the upper valve stem (10) pass through the two through holes respectively and are fixedly connected to the ball valve (8). The lower valve stem (5) and the upper valve stem (10) are both sealed with the valve seat (7), and the upper valve stem (10) is connected to the actuator (15). The valve body (1) is a double-layer composite structure. The outer layer of the valve body (1) has a compressive strength ≥200Mpa, and the inner layer of the valve body (1) has a thermal conductivity ≤0.15W / (m·K).

2. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnaces according to claim 1, characterized in that, The outer layer of the valve body (1) is made of A105 carbon steel, and the inner layer of the valve body (1) is made of ceramic fiber insulation.

3. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnaces according to claim 1, characterized in that, The ball valve (8) is a 995 alumina ceramic ball valve, which is wrapped with a valve core sleeve.

4. The high-temperature resistant integrated valve for uniform control of hot blast in blast furnace according to claim 1, characterized in that, The valve seat (7) is made of 995 alumina or Y-TZP.

5. The high-temperature resistant integrated valve for uniform control of hot blast in blast furnace according to claim 1, characterized in that, There is a stuffing box (11) between the upper valve stem (10) and the valve seat (7), and the stuffing box (11) is filled with packing (12).

6. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnace according to claim 1, characterized in that, The upper valve stem (10) is connected to the actuator (15) via a disc spring.

7. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnace according to claim 6, characterized in that, The disc spring outer sleeve is equipped with a heat dissipation connecting sleeve (14).

8. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnaces according to claim 1, characterized in that, A pressure transmitter (16), a temperature transmitter (17) and a flow transmitter (18) are provided on the valve body (1). The pressure transmitter (16), the temperature transmitter (17) and the flow transmitter (18) are all connected to the actuator (15).

9. The high-temperature resistant integrated valve for uniform regulation of hot blast in blast furnace according to claim 8, characterized in that, The probes of the pressure transmitter (16), temperature transmitter (17) and flow transmitter (18) are located upstream of the ball valve (8).

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