Semi-closed submerged arc furnace body temperature monitoring system

Abstract

The invention discloses a semi-closed submerged arc furnace body temperature monitoring system. The system comprises a first temperature acquisition group, a second temperature acquisition group and a temperature monitoring group, wherein the first temperature acquisition group is used for acquiring temperatures of a plurality of points at the bottom of a semi-closed submerged arc furnace; the second temperature acquisition group is used for acquiring the temperature of a plurality of points on the furnace wall of the semi-closed submerged arc furnace; the third temperature acquisition group is used for acquiring the temperature of a discharged finished product melt in each furnace outlet of the semi-closed submerged arc furnace; the fourth temperature acquisition group is used for acquiring the temperature of furnace gas emitted from each furnace gas pipeline of the semi-closed submerged arc furnace; the DCS is used for receiving the multiple pieces of furnace bottom temperature information acquired by the first temperature acquisition group and receiving the temperature information of the multiple temperature points of the furnace wall transmitted by the second temperature acquisition group; the temperature information, transmitted by the third temperature set, of the discharged finished product melt in each furnace outlet is received, the temperature information, transmitted by the fourth temperature collection set, of the furnace gas emitted out of each furnace gas pipeline is received, and monitoring of the temperature of the semi-closed submerged arc furnace body is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of fully automated products and relates to a temperature monitoring system for the furnace body of a semi-closed submerged arc furnace. Background Art

[0002] The smelting of silicon-based alloy products mostly uses semi-closed submerged arc furnaces. The reason is that industrial silicon, ferrosilicon, etc. are prone to sintering into blocks during the smelting process and the melting effect between the molten pools inside the furnace hearth is not good. Therefore, the submerged arc furnaces for the corresponding smelting products are mostly designed as semi-closed type. The furnace cover is mainly designed as a hexagon, with four sides designed with lifting furnace doors that can be lifted and opened when the furnace surface needs to be tamped, so that the boom of the tamping machine can extend into the furnace to start the tamping work. The other two sides are designed as fixed types with exhaust hoods connected above. During the smelting process, the CO generated reacts with O2 in the air to generate CO2 above the furnace surface and enters the next process link through the exhaust hood and the external furnace gas pipeline for waste heat utilization; in view of the problem that the melting effect between the molten pools below the furnace surface inside the furnace hearth is not good, a furnace body rotation system is designed to slowly run the furnace body by a single-point drive of a three-in-one reducer, so as to effectively communicate the molten pools.

[0003] In the production of submerged arc furnaces, energy is injected into the furnace through electrodes. The entire production process is a continuous high-temperature smelting. After a single smelting is completed, the finished product is discharged to the tapping trolley through the tapping port. A hood and a pipeline are arranged at the tapping port to discharge the high-temperature flue gas. Therefore, the temperature monitoring of the furnace body is particularly important, mainly including the temperature monitoring of the furnace bottom, the furnace wall tapping port, and the furnace gas pipeline. Summary of the Invention

[0004] In order to solve the problem that the temperature monitoring of the main body of a semi-closed submerged arc furnace cannot be accurately grasped, the technical solution adopted by the present invention is: a temperature monitoring system for the furnace body of a semi-closed submerged arc furnace, including:

[0005] The first temperature acquisition group: used to acquire the temperatures of multiple points at the furnace bottom of the semi-closed submerged arc furnace;

[0006] The second temperature acquisition group: used to acquire the temperatures of multiple points on the furnace wall of the semi-closed submerged arc furnace;

[0007] The third temperature acquisition group: used to acquire the temperature of the molten tapping product in each tapping port of the semi-closed submerged arc furnace;

[0008] The fourth temperature acquisition group: used to acquire the temperature of the furnace gas emerging from each furnace gas pipeline of the semi-closed submerged arc furnace;

[0009] The DCS control system: receives the temperature information of multiple furnace bottoms collected by the first temperature acquisition group, receives the temperature information of multiple temperature points on the furnace wall transmitted by the second temperature acquisition group, receives the temperature information of the molten product in each tapping port transmitted by the third temperature group, and receives the temperature information of the furnace gas emerging from each furnace gas pipeline transmitted by the fourth temperature acquisition group, to achieve the monitoring of the temperature of the semi-closed submerged arc furnace body.

[0010] Further, the first temperature acquisition group uses the first wireless temperature transmitter device;

[0011] The first wireless temperature transmitter device includes N bottom thermocouples, and the N bottom thermocouples collect the temperature of the furnace bottom;

[0012] The first wireless temperature transmitter receives the temperature information of the furnace bottom transmitted by the N bottom thermocouples and converts it into a micro-voltage signal;

[0013] The bottom thermocouples are connected to the first wireless temperature transmitter through glass fiber protective layer compensating wires;

[0014] The wireless transmitter receives the micro-voltage signal transmitted by the first wireless temperature transmitter and transmits it;

[0015] The first wireless receiving base station is used to receive the micro-voltage signal transmitted by the wireless transmitter and finally transmit it to the DCS control system.

[0016] Further, the value of N is 7. The 7 bottom thermocouples are respectively arranged at the bottoms opposite to the three electrodes, at the arc center points between any two of the three electrodes, and at the center point of the furnace bottom. The 6 bottom thermocouples except the center point of the furnace bottom are evenly distributed on the same circle centered on the center point of the furnace bottom.

[0017] Further, the bottom thermocouple includes a thermocouple head and a temperature-measuring thermocouple element connected to the thermocouple head;

[0018] The temperature-measuring thermocouple element includes a first armored thermocouple core. A first protective layer is arranged outside the first armored thermocouple core, and the first protective layer is made of GH3039 material;

[0019] A second protective layer is arranged outside the first protective layer, and the second protective layer is made of corundum material;

[0020] A third protective layer is arranged outside the second protective layer, and the third protective layer is made of stainless steel material.

[0021] Further, the second temperature acquisition group uses the second wireless temperature transmitter device; the second wireless temperature transmitter device uses a wireless signal output mode;

[0022] The second wireless temperature transmitter device includes M groups of furnace wall thermocouples; M is 4, and the 4 groups of furnace wall thermocouples are respectively arranged on both sides of two tapping openings. Each group of thermocouples consists of two thermocouples, which are arranged vertically one above the other and have different insertion depths into the furnace wall.

[0023] Furthermore, the furnace wall thermocouple includes a second armored thermocouple core;

[0024] An inner protective layer is arranged outside the second armored thermocouple core, and the inner protective layer is made of GH310S;

[0025] An intermediate protective layer is arranged outside the inner protective layer, and the intermediate protective layer is made of GH3039;

[0026] An outer protective layer is arranged outside the intermediate protective layer, and the outer protective layer is made of 304 stainless steel.

[0027] Furthermore, the third temperature acquisition group uses a hood optical pyrometer;

[0028] The optical pyrometer includes a body, a first armored hose assembly, a second armored hose assembly, a cooling device, an intermediate heat-insulating extension tube, an axial nozzle, and a quartz screen;

[0029] A cooling device is arranged inside the body, and a quartz screen is arranged at the middle position of the body to isolate the pyrometer body from the high-temperature area and ensure the permeability of the thermal radiation light at the same time;

[0030] A first armored hose assembly is arranged above the body for introducing compressed air;

[0031] One end of the second armored hose assembly is arranged below the first armored hose assembly and above the quartz screen; the other end of the second armored hose assembly is arranged below the quartz screen;

[0032] An intermediate heat-insulating extension tube is arranged inside the lower part of the body;

[0033] An axial nozzle is arranged inside the intermediate heat-insulating extension tube;

[0034] Among them, the compressed air passes through a manual stop valve, an armored hose assembly, and a cooling device and then is ejected through the axial nozzle and the intermediate heat-insulating extension tube to form a cooling zone.

[0035] Furthermore, according to the temperature information collected by the second temperature acquisition group, the furnace wall heat flux density Φ is calculated according to the following formula;

[0036] Φ = 1 / Rf × λ × [(Tb - Ta) × Ln(Ra / Rb)]

[0037] Among them, Rf is the distance from the center line of the electric arc furnace to the outer edge of the furnace wall, Ra is the distance from the center line of the furnace to the upper thermocouple end temperature measuring element, Rb is the distance from the center line of the furnace to the lower thermocouple end temperature measuring element, Ra>Rb, and λ=1,38W / mK is selected according to the refractory material property parameters.

[0038] The semi-enclosed ore-heating furnace body temperature monitoring system provided by the present invention realizes temperature monitoring of key parts of the main body of the ore-heating furnace, provides reliable and effective data support for the production of the ore-heating furnace, can be used for temperature monitoring and alarm of the main body of the ore-heating furnace, improves the overall intelligence level of the ore-heating furnace, and has the following advantages:

[0039] Realize the temperature monitoring of semi-closed ore-fired furnace;

[0040] Ensure the continuity of safe production;

[0041] The application of furnace temperature monitoring technology enhances our company's technical reserves for intelligent practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0043] Figure 1 It is a schematic diagram of the main body of the ore-fired furnace;

[0044] Figure 2 is a schematic diagram of a first temperature transmitting device;

[0045] Figure 3 is a schematic diagram of a second temperature transmitting device;

[0046] Figure 4 is a schematic diagram of a smoke hood optical pyrometer;

[0047] Figure 5 is a schematic diagram of a second temperature transmitting device;

[0048] Figure 6 This is a schematic diagram of the temperature monitoring system for a semi-closed ore-fired furnace.

[0049] Reference numerals: 1, first wireless transmitter; 2, first temperature transmitter; 3, glass fiber protective layer soft thermocouple wire; 4, first thermocouple head; 5, first movable ferrule; 6, first armored thermocouple core; 7, second protective layer; 8, third protective layer; 9, second armored thermocouple core; 10, second movable ferrule; 12, second wireless transmitter; 13, protective layer soft thermocouple wire; 14, second temperature transmitter; 15, body; 16, first armored hose assembly; 17, second armored hose assembly; 18, cooling device; 19, intermediate heat-insulating extension pipe; 20, axial nozzle; 21, quartz screen; 22, manual stop valve; 23, assembly flange; 24, outer protective layer; 25, third thermocouple head; 26, third movable ferrule; 27, third temperature transmitter; 28, device protection sleeve; 29, thermocouple protection sleeve; 30, third armored thermocouple core; 101 - 107, bottom thermocouples of the furnace; 201 - 208, wall thermocouples of the furnace; 209 - 210, hood optical pyrometers; 301 - 302, thermocouples for furnace gas pipelines. Detailed implementation manners

[0050] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0051] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0052] A semi-closed submerged arc furnace body temperature monitoring system, comprising:

[0053] The first temperature acquisition group: used to acquire the temperatures of multiple points at the bottom of the semi-closed submerged arc furnace;

[0054] The second temperature acquisition group: used to acquire the temperatures of multiple points on the wall of the semi-closed submerged arc furnace;

[0055] The third temperature acquisition group: used to acquire the temperature of the molten product during tapping in each tapping port of the semi-closed submerged arc furnace;

[0056] The fourth temperature acquisition group: used to acquire the temperature of the furnace gas emitted from each furnace gas pipeline of the semi-closed submerged arc furnace;

[0057] DCS control system: It receives multiple bottom furnace temperature information collected by the first temperature acquisition group, temperature information of multiple temperature points on the furnace wall transmitted by the second temperature acquisition group, temperature information of the molten product in each tapping port transmitted by the third temperature group, and temperature information of the furnace gas emitted from each furnace gas pipeline transmitted by the fourth temperature acquisition group, so as to monitor the temperature of the semi-closed submerged arc furnace body.

[0058] Among them, both the first temperature acquisition group and the second temperature acquisition group use wireless transmission to send signals, and the third temperature acquisition group and the fourth temperature acquisition group directly send the collected signals to the DCS control system;

[0059] The first temperature acquisition group uses the first wireless temperature transmitter device;

[0060] The first wireless temperature transmitter device includes N bottom furnace thermocouples, and the N bottom furnace thermocouples collect the temperature of the furnace bottom;

[0061] The first wireless temperature transmitter receives the bottom furnace temperature information transmitted by the N bottom furnace thermocouples and converts it into a micro-voltage signal;

[0062] The bottom furnace thermocouples are connected to the first wireless temperature transmitter through fiberglass protective layer compensating wires;

[0063] The first wireless transmitter 1 receives the micro-voltage signal transmitted by the first wireless temperature transmitter and transmits it;

[0064] The first wireless receiving base station is used to receive the micro-voltage signal transmitted by the wireless transmitter and finally transmit it to the DCS control system;

[0065] The battery is used to provide power for the first temperature transmitter 2, the first wireless transmitter 1 and the first wireless receiving base station,

[0066] A set of high-precision temperature measurement and wireless signal transmission temperature measurement solution composed of thermocouples, the first wireless temperature transmitter, the first wireless transmitter 1, the first wireless receiving base station and the battery is suitable for use in environments where on-site wiring is inconvenient or the temperature measurement instrument is far from the control cabinet. It has the characteristics of convenient installation, long transmission distance, anti-interference, high precision and no need for on-site wiring. The signals collected by the integrated wireless temperature transmitter carried by the sensor are sent to the wireless receiving terminal and finally transmitted to the control system to realize real-time monitoring of the measured medium.

[0067] The value of N is 7, and the 7 furnace bottom thermocouples 101-107 are respectively arranged at the bottom opposite to the three electrodes, the center point of the arc between any two electrodes of the three electrodes, and the center point of the furnace bottom. In this design, the 6 furnace bottom thermocouples other than the center point of the furnace bottom are evenly spaced on the same circle centered on the center point of the furnace bottom, and are evenly arranged at intervals of 60°.

[0068] The furnace bottom thermocouple comprises a first thermocouple head 4 and a temperature measuring thermocouple element connected to the first thermocouple head 4;

[0069] The first thermocouple head 4 works in a high temperature dust environment, and the ambient temperature is about 200°C. A temperature measuring thermocouple element with a K graduation number of -50 to 1200°C is selected, and the measuring end type is an insulation type with a Class II tolerance, such as Figure 2 As shown, a comprehensive protection method of metal + corundum sheath is adopted. The first armored thermocouple core 6 is made of GH3039 material with a diameter of φ8 as the first protective layer, and a second protective layer 7 is arranged outside the first protective layer. A thermocouple protection sheath made of corundum material with a diameter of φ18 is selected as the second protective layer 7. A third protective layer 8 is arranged outside the second protective layer 7. A device protection sheath made of GH3039 material with a diameter of φ40×3.5mm is selected as the third protective layer 8. The designed first movable sleeve 5 made of 304 stainless steel is moved on the metal tube to realize the depth of the thermocouple device inserted into the device protection sheath.

[0070] The furnace bottom wireless assembled thermocouple adopts 3 compensation wires with high temperature resistant glass fiber protective layer and soft couple wire, which can withstand temperature above 300℃ and meet the use requirements of ambient temperature of about 200℃. The first wireless transmitter 1 is extended to the normal temperature area. A single thermocouple transmits signals independently, and 7 wireless thermocouples share a 7-channel receiving base station. The first wireless transmitting end outputs LORA signals, and the first wireless receiving base station outputs 4-20mA to the DCS control system for signal display and control.

[0071] Because the furnace body rotates slowly under the action of the driving motor at the bottom, the seven furnace bottom thermocouples 101-107 and the furnace wall thermocouples 201-208 are designed as wireless transmission mode, and the receiving end is fixed on the wall or column of the on-site workshop;

[0072] The second temperature collection group adopts a second wireless temperature transmitter; the second wireless temperature transmitter adopts a wireless signal output mode;

[0073] The second wireless temperature transmitter includes M groups of furnace wall thermocouples 201-208;

[0074] A second wireless temperature transmitter receives the furnace bottom temperature information transmitted by the M furnace bottom thermocouples and converts it into a micro voltage signal;

[0075] The furnace wall thermocouple is connected to the second wireless temperature transmitter via a glass fiber protective layer compensation wire;

[0076] A second wireless transmitter 12 receives the micro-voltage signal transmitted by the second wireless temperature transmitter and transmits it;

[0077] A second wireless receiving base station is used to receive the micro-voltage signal transmitted by the wireless transmitter and finally transmit it to the DCS control system;

[0078] A battery is used to provide power to the second temperature transmitter 14, the second wireless transmitter 12 and the second wireless receiving base station,

[0079] Thermocouple, second wireless temperature transmitter, second wireless transmitter 12, first wireless receiving base station, battery, a set of high-precision temperature measurement, wireless signal transmission temperature measurement solution, suitable for use in environmental conditions where field wiring is inconvenient or the temperature measuring instrument is far away from the control cabinet. It has the characteristics of easy installation, long transmission distance, anti-interference, high accuracy, and no need for field wiring. The collected signal is sent to the wireless receiving terminal through the integrated wireless temperature transmitter carried by the sensor, and finally transmitted to the control system to realize real-time monitoring of the measured medium.

[0080] M is 4, and 4 groups of furnace wall thermocouples are respectively arranged on both sides of the two furnace outlets. Each group of thermocouples consists of two thermocouples, which are arranged up and down and inserted into the furnace wall at different depths.

[0081] The second wireless temperature transmitter includes M groups of furnace wall thermocouples 201-208; each group of thermocouples consists of two thermocouples arranged up and down and inserted into the furnace wall at different depths. The refractory material at the furnace outlet is easily damaged, which will cause a series of production problems, so the furnace outlet is a key monitoring area.

[0082] The furnace wall thermocouple includes a second armored thermocouple core 9; the movable sleeve of the furnace wall thermocouple works in a high temperature dust environment, and the ambient temperature is about 1000°C. The temperature measuring thermocouple element with S graduation number of -50~1300°C is selected, and the measuring end type is insulation type, II level tolerance,

[0083] like Figure 3 As shown, a metal protection method is adopted, an inner protection layer is provided on the outside of the second armored thermocouple core 9, and a material with a diameter of φ6GH310S is selected for the first layer of protection;

[0084] An intermediate protection layer is arranged outside the inner protection, and the intermediate protection layer uses a GH3039 thermocouple protection sleeve with a diameter of φ18 as the second layer of protection.

[0085] After that, directly drill a hole in the furnace wall to install the fixed base, and use this as a guide to directly insert it into the refractory material of the furnace wall, directly contact with the refractory material for temperature measurement. The designed second movable ferrule 10 made of 304 stainless steel serves as the outer protective layer 24 for the third layer of protection. It moves on the metal tube to achieve the depth of insertion of the thermocouple device into the protective sleeve. Due to the relatively high temperature on the outer periphery of the furnace wall during the tapping process, the electronic components in the second temperature transmitter 14 cannot withstand temperatures higher than 80 °C. The meter head is relocated to a distance through the armored core. The φ6 GH310S material and the inner core for the inner layer protection are designed to be 6000 mm long. Considering the on-site working conditions, since GH3039 has a higher hardness than 310S and is not conducive to on-site operation, the φ6 GH310S armored core is used. According to the actual arrangement position of the on-site device, the armored thermocouple core is flexibly operated to change the on-site wiring, but GH3039 is a better choice when used for the protective sleeve to ensure the product performance. On the path of the meter head extension, in order to improve the high-temperature resistance characteristics, a φ25 silicon carbide protection tube fixed on the outer side of the furnace wall is used. At the inlet and outlet of this tube, slag refractory cotton is used to wrap the φ6 GH310S armored core. Inserting two thermocouples directly measuring the refractory material on the same side of the tapping port to make a temperature difference can realize the estimation of the furnace temperature. Each single thermocouple independently emits a signal, and 8 wireless thermocouples share 1 8-channel receiving base station. The second wireless transmitter outputs LORA signals, and the second receiving base station outputs 4 - 20 mA to the DCS control system for signal display and control.

[0086] The hood optical pyrometer and the furnace gas pipeline thermocouple do not rotate with the furnace body, so they are designed to be fixed.

[0087] The third temperature acquisition group uses a hood optical pyrometer 209 - 210;

[0088] The optical pyrometer includes a body 15, a first armored hose assembly 16, a second armored hose assembly 17, a cooling device 18, an intermediate heat-insulating extension tube, an axial nozzle, and a quartz screen;

[0089] A cooling device 18 is arranged inside the body 15, and a quartz screen is arranged at the middle position of the body 15 to isolate the pyrometer body 15 from the high-temperature area while ensuring the permeability of the thermal radiation light;

[0090] A first armored hose assembly 16 is arranged above the body 15 for introducing compressed air;

[0091] One end of the second armored hose assembly 17 is arranged below the first armored hose assembly 16 and above the quartz screen; the other end of the second armored hose assembly 17 is arranged below the quartz screen;

[0092] An intermediate heat-insulating extension tube is arranged inside the lower part of the body 15;

[0093] An axial nozzle is provided inside the middle temperature-insulating extension tube;

[0094] The smoke hood optical pyrometer can indirectly monitor the working status of the furnace outlet and detect the temperature of the finished melt out of the furnace. The temperature measurement range is 250~2000℃. Figure 4 As shown, the pyrometer body 15 is cooled by compressed air. The compressed air passes through the manual stop valve, the armored hose assembly, the cooling device 18, and then the axial nozzle and the middle insulation extension tube to spray the gas to form a cooling zone; a quartz screen is used to isolate the pyrometer body 15 from the high temperature area, while ensuring the permeability of the thermal radiation light for accurate temperature measurement; the optical pyrometer is fixed to the smoke hood using the assembly flange 23.

[0095] The fourth temperature acquisition group adopts a third temperature transmission device;

[0096] The third temperature transmitter device includes a furnace gas pipeline thermocouple and a connected third temperature transmitter 27;

[0097] Furnace gas pipeline thermocouple 301-302: set on the furnace gas pipeline.

[0098] The furnace gas pipeline thermocouple includes a third thermocouple head 25 and a third armored thermocouple core 3030 connected thereto.

[0099] The third thermocouple head 25 works in a high temperature dust environment, and the ambient temperature is room temperature. Select a temperature measuring thermocouple element with a S graduation number of -50 to 1300°C, the measuring end type is an insulation type, and the tolerance is Class II. Figure 5 As shown, a comprehensive protection method of metal + corundum sleeve is adopted, the third armored thermocouple core 30 is protected by GH3039 material with a diameter of φ8 for the first layer, the thermocouple protection sleeve 29 with a diameter of φ18 is used for the second layer, and the device protection sleeve 28 with a diameter of φ40×3.5mm GH3039 is used for the third layer. The third movable sleeve 26 made of 304 stainless steel is designed to move on the metal pipe to achieve the depth of the thermocouple device inserted into the device protection sleeve. The flue gas duct thermocouple uses conventional compensation wires, and the third temperature transmitter 27 transmits the converted micro-voltage signal to the DCS system.

[0100] A group of furnace wall thermocouples 201-208 are respectively arranged on both sides of the two furnace outlets, each group of thermocouples consists of two thermocouples, which are arranged up and down and inserted into the furnace wall at different depths. Different temperatures are detected by different insertion depths. According to the temperature information collected by the second temperature collection group, the furnace wall heat flux density Φ is calculated according to the following formula;

[0101] Φ = 1 / Rf × λ × [(Tb - Ta) × Ln(Ra / Rb)]

[0102] Wherein, Rf is the distance from the center line of the submerged arc furnace to the outer edge of the furnace wall, Ra is the distance from the furnace center line to the temperature measuring element at the end of the upper thermocouple, Rb is the distance from the furnace center line to the temperature measuring element at the end of the lower thermocouple, Ra > Rb, and λ = 1.38 W / m.K is selected according to the refractory property parameters.

[0103] As Figure 6 shown, the bottom thermocouples 101 - 107 all independently emit signals. Seven wireless thermocouples share one 7-channel receiving base station. The transmitting end outputs LORA signals, and the receiving base station outputs 4 - 20 mA to the DCS control system for signal display and control;

[0104] The wall thermocouples 201 - 208 all independently emit signals. Eight wireless thermocouples share one 8-channel receiving base station. The transmitting end outputs LORA signals, and the receiving base station outputs 4 - 20 mA to the DCS control system for signal display and control;

[0105] The hood optical pyrometers 209 - 210 directly output 4 - 20 mA to the DCS control system for signal display and control;

[0106] The furnace gas pipeline thermocouples 301 - 302 directly output 4 - 20 mA to the DCS control system for signal display and control.

[0107] In the DCS control system, three-segment bar charts are used to display the values of thermocouple numbers, furnace wall heat flux density, etc. The normal values are shown in green, the values exceeding the warning value are shown in yellow, and the values exceeding the alarm value are shown in red.

[0108] The semi-closed submerged arc furnace body temperature monitoring system designed and developed by us, some of the related technologies can be partially applied and extended to the closed submerged arc furnace temperature monitoring system. This part of the technology is also within the scope of protection of this solution and is subject to the constraints of this technical solution.

[0109] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A semi-closed ore-fired furnace body temperature monitoring system, characterized in that: include: The first temperature collection group is used to collect the temperature of multiple points on the bottom of the semi-closed ore furnace; The second temperature collection group is used to collect the temperature of multiple points on the furnace wall of the semi-closed ore furnace; The third temperature collection group is used to collect the temperature of the finished melt discharged from each outlet of the semi-closed ore-fired furnace; The fourth temperature collection group is used to collect the temperature of the furnace gas emitted from each furnace gas pipeline of the semi-closed ore-fired furnace; The DCS control system receives the temperature information of multiple furnace bottoms collected by the first temperature collection group, receives the temperature information of multiple temperature points on the furnace wall transmitted by the second temperature collection group, receives the temperature information of the finished melt discharged from each furnace outlet transmitted by the third temperature group, and receives the temperature information of the furnace gas emitted from each furnace gas pipeline transmitted by the fourth temperature collection group, so as to monitor the furnace body temperature of the semi-closed ore-fired furnace.

2. A semi-closed ore-fired furnace body temperature monitoring system according to claim 1, characterized in that: The first temperature acquisition group uses a first wireless temperature transmission device; The first wireless temperature transmitter includes N furnace bottom thermocouples, and the N furnace bottom thermocouples collect the temperature of the furnace bottom; A first wireless temperature transmitter receives the furnace bottom temperature information transmitted by the N furnace bottom thermocouples and converts it into a micro voltage signal; The furnace bottom thermocouple is connected to the first wireless temperature transmitter via a glass fiber protective layer compensation wire; A wireless transmitter receives the micro-voltage signal transmitted by the first wireless temperature transmitter and transmits it; The first wireless receiving base station is used to receive the micro-voltage signal transmitted by the wireless transmitter and finally transmit it to the DCS control system.

3. A semi-closed ore-fired furnace body temperature monitoring system according to claim 1, characterized in that: The value of N is 7, and the 7 furnace bottom thermocouples are respectively arranged at the bottom opposite to the three electrodes, the center point of the arc between any two electrodes of the three electrodes, and the center point of the furnace bottom. The 6 furnace bottom thermocouples other than the center point of the furnace bottom are distributed at equal intervals on the same circle centered on the center point of the furnace bottom.

4. A semi-closed ore-fired furnace body temperature monitoring system according to claim 2, characterized in that: The furnace bottom thermocouple comprises a first thermocouple head and a first temperature measuring thermocouple element connected to the thermocouple head; The first temperature measuring thermocouple element comprises a first armored thermocouple core, a first protective layer is arranged outside the first armored thermocouple core, and the first protective layer is made of GH3039 material; A second protective layer is arranged outside the first protective layer, and the second protective layer is made of corundum; A third protective layer is arranged outside the second protective layer, and the third protective layer is made of stainless steel.

5. The semi-closed ore-fired furnace body temperature monitoring system according to claim 1 is characterized in that: The second temperature collection group adopts a second wireless temperature transmitter; the second wireless temperature transmitter adopts a wireless signal output mode; The second wireless temperature transmitter includes M groups of furnace wall thermocouples; M is 4, and the 4 groups of furnace wall thermocouples are respectively arranged on both sides of the two furnace outlets, each group of thermocouples consists of two thermocouples, which are arranged up and down and inserted into the furnace wall at different depths.

6. A semi-closed ore-fired furnace body temperature monitoring system according to claim 5, characterized in that: The furnace wall thermocouple includes a second armored thermocouple core; An inner protective layer is arranged outside the second armored thermocouple core, and the inner protective layer is made of GH310S; An intermediate protective layer is arranged outside the inner protective layer, and the material used for the intermediate protective layer is GH3039; An outer protective layer is arranged outside the middle protective layer, and the material adopted by the outer protective layer is 304 stainless steel.

7. A semi-closed ore-fired furnace body temperature monitoring system according to claim 1, characterized in that: The third temperature acquisition group uses a smoke hood optical pyrometer; The optical pyrometer comprises a body, a first armored hose assembly, a second armored hose assembly, a cooling device, an intermediate temperature-insulating extension tube, an axial nozzle, and a quartz screen; A cooling device is arranged inside the body, and a quartz screen is arranged in the middle of the body to isolate the pyrometer body from the high temperature zone and ensure the transparency of the thermal radiation light; A first armored hose assembly is arranged above the body for introducing compressed air; One end of the second armored hose assembly is arranged below the first armored hose assembly and above the quartz screen; the other end of the second armored hose assembly is arranged below the quartz screen; An intermediate temperature-insulating extension tube is provided inside the lower part of the body; An axial nozzle is provided inside the middle temperature-insulating extension tube; The compressed air passes through the manual stop valve, the armored hose assembly, the cooling equipment, and then the axial nozzle and the middle temperature-insulating extension pipe to spray the gas to form a cooling zone.

8. The semi-closed ore-fired furnace body temperature monitoring system according to claim 1 is characterized in that: According to the temperature information collected by the second temperature collection group, the furnace wall heat flux density Φ is calculated according to the following formula; Φ=1 / Rf×λ×[(Tb-Ta)×Ln(Ra / Rb)] Among them, Rf is the distance from the center line of the electric arc furnace to the outer edge of the furnace wall, Ra is the distance from the center line of the furnace to the upper thermocouple end temperature measuring element, Rb is the distance from the center line of the furnace to the lower thermocouple end temperature measuring element, Ra>Rb, and λ=1,38W / mK is selected according to the refractory material property parameters.

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