Temperature-control zirconia oxygen sensor for industrial furnace

Abstract

The utility model discloses an industrial furnace temperature control zirconia oxygen sensor which comprises a zirconia oxygen sensor, a gas cooling pipe, a protective cover and the like, the gas cooling pipe is arranged on the zirconia oxygen sensor in a surrounding mode, and the zirconia oxygen sensor and the gas cooling pipe are coaxially arranged in the protective cover of a pipe structure. The two ends of the zirconium oxide oxygen sensor penetrate out of the two ends of the protective cover, and a flange is arranged at one end of the protective cover. By adopting the mode, the temperature-control zirconia oxygen sensor for the industrial furnace provided by the utility model maintains a low-temperature environment through the gas cooling pipe, and uses the protective cover as a heat conducting medium of the gas cooling pipe and the industrial furnace, so that the gas cooling pipe is protected, and the temperature-control zirconia oxygen sensor for the industrial furnace can be used for temperature control while the gas cooling pipe is protected. Redundant heat conducted to the sensor support structure in the industrial furnace is fully led out along with nitrogen to reduce the high-temperature oxidation corrosion influence of the high temperature of the industrial furnace on the zirconia oxygen sensor body, so that the service life of the sensor under the high-temperature working condition is remarkably prolonged on the premise of ensuring the catalytic activity of the sensor.

Description

Technical Field

[0001] The utility model relates to the field of continuous casting process control devices, in particular to a zirconium oxide oxygen sensor for temperature control of an industrial furnace. Background Art

[0002] Zirconia oxygen sensors utilize the oxygen ion conductivity of stable zirconium dioxide ceramics under specific temperature conditions (typically above 650°C). When different oxygen partial pressures exist in the gases on either side of the zirconium dioxide bulk ceramic, oxygen ion migration occurs within the ceramic, generating a measurable oxygen potential signal through the electrodes on both sides.

[0003] During the continuous casting process, the furnace atmosphere needs to be controlled to protect the workpiece from oxidation or contamination. Zirconia oxygen sensors can monitor the oxygen content in the furnace atmosphere in real time to ensure the stability and purity of the atmosphere.

[0004] During the continuous casting process, the temperature of the molten steel must remain within a specific range to ensure the quality of the cast billets and smooth production. Generally speaking, steel mills maintain temperatures between 1100°C and 1250°C for continuous casting and rolling. This temperature range ensures complete solidification of the billets, preventing quality defects, while also minimizing heat and carbon losses, ensuring the performance and quality of the steel.

[0005] As temperature rises, the conductivity of zirconia ceramics, the reactivity of the electrodes, and the thermal stability of the entire sensor all change. At high temperatures, the catalytic activity of the electrode material may increase, but this also causes rapid oxidation, corrosion, and wear, which in turn rapidly shortens the service life of the zirconia oxygen sensor. Utility Model Content

[0006] The main technical problem solved by the utility model is to provide a temperature-controlled zirconia oxygen sensor for an industrial furnace. The oxygen probe and internal structural components are maintained in a low-temperature environment of 650°C through a gas cooling tube, and a protective cover is used as a heat-conducting medium between the gas cooling tube and the industrial furnace. While protecting the gas cooling tube, the excess heat conducted from the industrial furnace to the sensor bracket structure is fully discharged with nitrogen to reduce the high-temperature oxidation corrosion effect of the high temperature of the industrial furnace on the zirconia oxygen sensor body, thereby significantly extending the service life of the sensor under high-temperature conditions while ensuring its catalytic activity.

[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an industrial furnace temperature control zirconia oxygen sensor, including a zirconia oxygen sensor, a gas cooling tube, a protective cover, a flange, a cooling air inlet and a cooling air outlet. The zirconia oxygen sensor is surrounded by a gas cooling tube, and the zirconia oxygen sensor and the gas cooling tube are coaxially arranged in the protective cover of the tube structure. The two ends of the zirconia oxygen sensor pass through the two ends of the protective cover. A flange is provided at one end of the protective cover, and the flange is provided with a cooling air inlet and a cooling air outlet respectively connected to the two ends of the gas cooling tube on the side facing away from the protective cover.

[0008] In a preferred embodiment of the present invention, the cooling air inlet and the cooling air outlet are externally connected to a nitrogen compressor via pipelines, and a radiator is provided on the pipelines.

[0009] In a preferred embodiment of the present invention, the gas cooling tube is divided into an input section and a return section connected with equal lengths. The input section and the return section are arranged in opposite directions and repeatedly cover the zirconium oxide oxygen sensor. The input section and the return section are interlaced and wound at intervals.

[0010] In a preferred embodiment of the present invention, the gas cooling pipe is in a spiral shape.

[0011] In a preferred embodiment of the present invention, concentric through holes are provided on the end surface and the flange of the protective cover, and the zirconia oxygen sensor is coaxially inserted into the concentric through holes.

[0012] In a preferred embodiment of the present invention, the input section is attached to the inner wall of the protective cover, and the reflux section is attached to the outer peripheral surface of the zirconia oxygen sensor.

[0013] The beneficial effects of the utility model are as follows: the utility model provides an industrial furnace temperature-controlled zirconia oxygen sensor, which maintains the oxygen probe and internal structural components in a low-temperature environment of 650°C through a gas cooling tube, and uses a protective cover as a heat-conducting medium between the gas cooling tube and the industrial furnace. While protecting the gas cooling tube, the utility model fully conducts excess heat from the industrial furnace to the sensor bracket structure with nitrogen to reduce the high-temperature oxidation corrosion effect of the high temperature of the industrial furnace on the zirconia oxygen sensor body, thereby significantly extending the service life of the sensor under high-temperature working conditions while ensuring its catalytic activity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0015] Figure 1 This is the overall structural diagram of a preferred embodiment of a zirconia oxygen sensor for temperature control of an industrial furnace according to the present invention;

[0016] Figure 2 The utility model is a cross-sectional view of a zirconium oxide oxygen sensor for temperature control of an industrial furnace. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figure 1-2 As shown, the embodiment of the utility model includes:

[0019] A zirconia oxygen sensor for temperature control of an industrial furnace comprises a zirconia oxygen sensor 1, a gas cooling tube 2, a protective cover 3, a flange 4, a cooling air inlet 5 and a cooling air outlet 6. The gas cooling tube 2 is arranged around the zirconia oxygen sensor 1. The zirconia oxygen sensor 1 and the gas cooling tube 2 are coaxially arranged in the protective cover 3 of a tube structure. The two ends of the zirconia oxygen sensor 1 pass through the two ends of the protective cover 3. A flange 4 is provided at one end of the protective cover 3. The flange 4 is provided with a cooling air inlet 5 and a cooling air outlet 6 on the side facing away from the protective cover 3, which are respectively connected to the two ends of the gas cooling tube 2.

[0020] The cooling air inlet 5 and the cooling air outlet 6 are externally connected to a nitrogen compressor via pipelines, and a radiator is provided on the pipelines.

[0021] Furthermore, the gas cooling tube 2 is divided into an input section 21 and a return section 22 connected with equal lengths. The input section 21 and the return section 22 are arranged in opposite directions and repeatedly cover the zirconia oxygen sensor 1. The input section 21 and the return section 22 are interlaced and wound.

[0022] Furthermore, the gas cooling pipe 2 is in a spiral shape.

[0023] Furthermore, concentric through holes are provided on the end surface of the protective cover 3 and the flange 4 , and the zirconia oxygen sensor 1 is coaxially inserted into the concentric through holes.

[0024] Furthermore, the input section 21 is attached to the inner wall of the protective cover 3 , and the reflux section 22 is attached to the outer peripheral surface of the zirconia oxygen sensor 1 . The heat extracted comes from the zirconia oxygen sensor 1 and the protective cover 3 .

[0025] Furthermore, the input section 21 and the return section 22 are suspended in the gap between the zirconia oxygen sensor 1 and the protective cover 3. The heat they dissipate comes from the air in the gap.

[0026] When the zirconia oxygen sensor 1 operates above 650°C, the varying oxygen partial pressures in the gases on either side of the zirconia ceramic block cause oxygen ion migration within the ceramic, generating a measurable oxygen potential signal. At the continuous casting temperatures of 1100°C to 1250°C found in steel mills, the conductivity of the zirconia ceramic, the reactivity of the electrodes, and the thermal stability of the entire sensor 1 all change, leading to rapid oxidation, corrosion, and wear of the material itself.

[0027] To address this issue, a nitrogen compressor continuously supplies nitrogen to the cooling inlet 5. This nitrogen flows through the gas cooling tube 2, absorbing heat from the protective cover 3. This heat is then discharged through the cooling outlet 6 along with the nitrogen. By controlling the nitrogen flow rate and inlet temperature, a low-temperature environment of at least 650 degrees Celsius is created for the zirconia oxygen sensor 1, thereby maximizing its service life while maintaining its performance. The heated nitrogen is then cooled externally by a radiator before being re-introduced into the protective cover 3 via the nitrogen compressor.

[0028] This product replaces the common oxygen sensor 1 without any damage. There is no need to modify the furnace structure. The flange 4 is tightly connected to the industrial furnace, making it easy to maintain.

[0029] In summary, the present invention provides an industrial furnace temperature-controlled zirconia oxygen sensor 1, which maintains the oxygen probe and internal structural components in a low-temperature environment of 650°C through a gas cooling tube, and uses a protective cover as a heat-conducting medium between the gas cooling tube and the industrial furnace. While protecting the gas cooling tube, the excess heat conducted from the industrial furnace to the sensor bracket structure is fully discharged with nitrogen to reduce the high-temperature oxidation corrosion effect of the high temperature of the industrial furnace on the zirconia oxygen sensor body, thereby significantly extending the service life of the sensor under high-temperature conditions while ensuring its catalytic activity.

[0030] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An industrial furnace temperature control zirconia oxygen sensor, characterized in that: It includes a zirconia oxygen sensor, a gas cooling tube, a protective cover, a flange, a cooling air inlet and a cooling air outlet. The gas cooling tube is arranged around the zirconia oxygen sensor. The zirconia oxygen sensor and the gas cooling tube are coaxially arranged in the protective cover of the tube structure. The two ends of the zirconia oxygen sensor pass through the two ends of the protective cover. A flange is provided at one end of the protective cover. The flange is provided with a cooling air inlet and a cooling air outlet respectively connected to the two ends of the gas cooling tube on the side facing away from the protective cover.

2. The zirconia oxygen sensor for industrial furnace temperature control according to claim 1, characterized in that: The cooling air inlet and the cooling air outlet are externally connected to a nitrogen compressor via pipelines, and a radiator is provided on the pipelines.

3. The industrial furnace temperature control zirconia oxygen sensor according to claim 1, characterized in that: The gas cooling pipe is divided into an input section and a return section connected with equal lengths. The input section and the return section are arranged in opposite directions and repeatedly cover the zirconium oxide oxygen sensor. The input section and the return section are interlaced and wound at intervals.

4. The zirconia oxygen sensor for temperature control of an industrial furnace according to claim 1, characterized in that: The gas cooling pipe is in a spiral shape.

5. The zirconia oxygen sensor for temperature control of an industrial furnace according to claim 1, characterized in that: Concentric through holes are provided on the end surface and the flange of the protective cover, and the zirconia oxygen sensor is coaxially inserted into the concentric through holes.

6. The zirconia oxygen sensor for controlling temperature of an industrial furnace according to claim 3, characterized in that: The input section is attached to the inner wall of the protective cover, and the reflux section is attached to the outer peripheral surface of the zirconia oxygen sensor.

Images