Non-contact temperature measuring system for detecting temperature of molten steel in steelmaking process

Abstract

The invention discloses a non-contact temperature measuring system for detecting the temperature of molten steel in a steelmaking process, which belongs to the technical field of metal smelting and comprises an electric arc furnace, a steam generator, an electrolyzed water system, a piston type oxygen compression device, a piston type hydrogen compression device and a plurality of non-contact temperature measuring devices. The water electrolysis system comprises a water electrolysis device and an electrolytic tank. The piston type oxygen compression device forms a first steam containing cavity and an oxygen containing cavity. The piston type hydrogen compression device forms a second steam containing cavity and a hydrogen containing cavity. Oxygen is compressed through the piston type oxygen compression device, forms high-pressure oxygen jet flow after being released and is sprayed out of the non-contact type temperature measuring device, scum on the surface of a molten pool is purged to expose molten steel on the lower portion, the infrared temperature measuring function of the non-contact type temperature measuring device is enhanced, and the accuracy of the temperature of the molten steel is obtained. When a slag layer is thick in the steel-making process of the electric arc furnace, cyclic hydrogen coherent jet flow can be adopted, and the slag blowing strength of blowing airflow is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal smelting, and in particular is a non-contact temperature measuring system for detecting the temperature of molten steel in a steelmaking process. Background Art

[0002] The process of steelmaking in an electric arc furnace is accompanied by the interaction of multiple energies and the transmission of heat, completing the transformation of metal furnace materials, mainly scrap steel, into high-temperature liquid steel with qualified temperature and chemical composition. During the smelting process, many energies such as the electric energy input by the motor, the physical heat of the molten iron, and the chemical heat formed by the oxidation of elements interact in the molten pool, promoting the melting phase change and composition change of solid furnace materials such as scrap steel. After most of the energy is absorbed by the molten pool, the temperature of the molten pool rises accordingly. As the smelting progresses, the temperature of the molten pool fluctuates continuously. The molten pool temperature directly affects the oxygen supply, power supply, auxiliary material addition and injection operations and the smelting process of the electric arc furnace smelting process, and determines the product quality of the molten steel with qualified final temperature and chemical composition.

[0003] Conventional molten pool temperature measurement methods use industrial smelting temperature measuring guns to measure the process temperature from the furnace door by on-site operators, and use the temperature of the temperature measuring point at the insertion depth of the temperature measuring gun as the temperature of the entire molten pool to determine the temperature of the molten steel in the molten pool. This detection method relies on manual temperature measurement, close contact with high-temperature occasions, high safety risks, and is prone to high-temperature thermal damage. The molten steel temperature obtained by the detection can only represent the temperature of a local area in the molten pool, and does not consider the influence of the uneven distribution of the molten pool temperature field. The obtained temperature data cannot represent the temperature of the entire molten steel pool, and there are disadvantages such as large errors.

[0004] In order to solve this problem and avoid the safety issues of manual temperature measurement, non-contact temperature measurement methods are often used to obtain the temperature of the molten steel in the molten pool. This method can simultaneously obtain the temperature of multiple measuring points on the high-temperature liquid surface of the molten pool, and can provide real-time feedback on the temperature information of the molten pool liquid surface. However, during the smelting process of the electric arc furnace, the upper part of the molten steel surface is covered with slag liquid. Ordinary infrared temperature measuring devices can only obtain the temperature of the slag liquid, while the temperature signal of the molten steel below is blocked. Therefore, the temperature signal obtained by this method still has a certain difference from the actual molten steel temperature, making it difficult to accurately obtain the molten steel temperature in real time, and it is impossible to feedback control and guide actual oxygen and power supply operations. Summary of the invention

[0005] The object of the present invention is to provide a non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process, so as to solve the problems raised in the above-mentioned prior art.

[0006] A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process is provided, comprising:

[0007] Electric arc furnace;

[0008] Steam generator;

[0009] A water electrolysis system, comprising a water electrolysis device and an electrolysis cell, wherein the water electrolysis device is arranged in the electrolysis cell;

[0010] A piston-type oxygen compression device, which is isolated by a first piston to form a first steam receiving chamber and an oxygen receiving chamber, wherein the first steam receiving chamber is connected to a steam generator, and the oxygen receiving chamber is connected to a positive terminal of a water electrolysis device;

[0011] A piston-type hydrogen compression device, which is isolated by a second piston to form a second steam receiving chamber and a hydrogen receiving chamber, wherein the second steam receiving chamber is connected to the steam generator, and the hydrogen receiving chamber is connected to the negative terminal of the water electrolysis device;

[0012] A plurality of non-contact temperature measuring devices are provided, wherein one end of the plurality of non-contact temperature measuring devices is respectively connected to the oxygen containing chamber and the hydrogen containing chamber and the other end is connected to the interior of the electric arc furnace.

[0013] As a further embodiment of the present invention: the non-contact temperature measuring device includes a main oxygen jet pipeline, an epoxy jet pipeline and a temperature measuring inner tube, the input end of the main oxygen jet pipeline is connected to the oxygen containing chamber, the temperature measuring inner tube is used to measure the temperature, and the epoxy jet pipeline is arranged around the periphery of the main oxygen jet pipeline and one end is connected to the main oxygen jet pipeline. The main oxygen jet pipeline compresses oxygen through a narrow and long pipeline to form a core section that is ejected to purge the slag. A small amount of oxygen flow in the main oxygen jet pipeline enters the epoxy jet pipeline, and under the restriction of the annular structure, a ring gas is formed around the core section oxygen jet, which slows down the attenuation of the supersonic oxygen jet and plays a role in maintaining the length and penetration of the jet core section.

[0014] As a further embodiment of the present invention: the main oxygen jet pipeline is a nozzle structure consisting of a pipeline inlet, a pipeline constriction and a pipeline outlet. The main oxygen jet pipeline forms a Laval nozzle through a gradually contracting and expanding structure, which accelerates the flow rate of the oxygen gas flow and makes the oxygen jet reach a supersonic state.

[0015] As a further embodiment of the present invention: the non-contact temperature measuring device also includes a ring hydrogen jet conduit, which is arranged around the periphery of the main oxygen jet conduit, one end of which is connected to the hydrogen containing cavity and the other end of which is connected to the inside of the electric arc furnace. The ring hydrogen jet conduit uses a ring structure to form a ring gas around the core section of the oxygen jet to enhance the length and penetration of the core section of the oxygen jet. The ring hydrogen can undergo a combustion reaction with the epoxy ejected from the epoxy jet conduit. Compared with the single epoxy action, this combustion reaction has a stronger effect in maintaining and enhancing the core section length and penetration of the supersonic oxygen jet.

[0016] As a further embodiment of the present invention: the temperature measuring inner tube includes a temperature measuring probe, a probe inner tube cooling cavity, a cooling water inlet pipe and a cooling water outlet pipe, and the cooling water inlet pipe and the cooling water outlet pipe are respectively connected to the probe inner tube cooling cavity. Cooling water is input into the probe inner tube cooling cavity through the cooling water inlet pipe to cool the temperature measuring probe, and then discharged through the cooling water outlet pipe to realize the circulation of cooling water, protect the temperature measuring probe and the signal output element, and ensure the accuracy of temperature measurement.

[0017] As a further embodiment of the present invention, it also includes a water supply box, which is used to supply water to the steam generator and the electrolytic cell respectively, the cooling water inlet pipe is connected to the water supply box, and the cooling water outlet pipe is connected to the electrolytic cell. The cooling water of the water supply box is supplied to the cooling cavity of the inner tube of the probe for cooling, and the temperature of the water itself will rise. The heated water is discharged into the electrolytic cell for electrolysis, which can speed up the speed of oxygen and hydrogen production (the higher the temperature of the electrolyzed water, the higher the efficiency).

[0018] As a further embodiment of the present invention: it also includes an electrolytic cell exhaust steam pipeline and an oxygen delivery pipeline, one end of the electrolytic cell exhaust steam pipeline is connected to the electrolytic cell and the other end is respectively connected to the first steam receiving chamber and the second steam receiving chamber, the oxygen delivery pipeline is used to connect the electrolytic cell with the oxygen receiving chamber, and the oxygen delivery pipeline performs heat exchange with the electrolytic cell exhaust steam pipeline. After the work is completed, the high-temperature and high-pressure steam is discharged from the electrolytic cell exhaust steam pipeline as exhaust steam, and heat exchange is performed with the oxygen transported in the oxygen delivery pipeline during the circulation process of the electrolytic cell exhaust steam pipeline, and the oxygen can be preheated to increase the temperature of the oxygen. On the one hand, the compressed oxygen in the oxygen receiving chamber can reach the set pressure value in advance, and on the other hand, the penetration of the oxygen jet core section can be improved.

[0019] As a further embodiment of the present invention: the oxygen delivery pipeline includes a gas storage tank and a multi-point balanced heat exchanger that are sequentially connected along the oxygen output direction, and the path of the electrolytic cell exhaust steam pipeline runs through the multi-point balanced heat exchanger. The gas storage tank can be used as a temporary storage point for oxygen. When temperature measurement and oxygen supply to the molten pool are not required, the oxygen is stored for subsequent use to prevent insufficient oxygen supply when the usage suddenly increases. The multi-point balanced heat exchanger enhances the heat exchange rate between oxygen and steam through inter-wall heat exchange.

[0020] As a further embodiment of the present invention: the side wall of the electric arc furnace is connected with a flue, and a spiral heating coil is arranged in the steam generator, and the spiral heating coil is wound around the periphery of the flue and the two ends are respectively connected with the inside of the steam generator. The spiral heating coil can exchange heat with the high-temperature flue gas in the flue for steam production, and the waste heat generated by the electric arc furnace is fully utilized for compression work of the piston-type oxygen compression device and the piston-type hydrogen compression device, saving a lot of energy.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The oxygen produced by the temperature measurement system is compressed by the piston-type oxygen compression device, and after release, a high-pressure oxygen jet is formed and ejected from the non-contact temperature measurement device to sweep the slag on the surface of the molten pool to expose the molten steel below, thereby enhancing the accuracy of the infrared temperature measurement function of the non-contact temperature measurement device in obtaining the temperature of the molten steel.

[0023] 2. Oxygen has different functions in different time periods of arc furnace steelmaking. In addition to being used to purge slag, in the process where the non-contact temperature measuring device does not measure temperature (such as the melting of charge and the reaction of the molten pool in the early stage of arc furnace smelting, the temperature of the molten pool does not need to be measured), it can still be used as a conventional supersonic oxygen jet because it can provide supersonic oxygen jet. At this time, the main function of the non-contact temperature measuring device is to supply oxygen to the molten pool, accelerate the melting of charge, heat release of chemical reaction in the molten pool and smelting process.

[0024] 3. When the slag layer is thick during the steelmaking process of the electric arc furnace, it is difficult to blow away the slag layer with conventional oxygen jet or the blowing effect is not obvious, the ring hydrogen coherent jet can be used to improve the blowing strength of the purge airflow. Specifically, the produced hydrogen is compressed by the piston-type hydrogen compression device, and after release, it enters the non-contact temperature measuring device and is ejected in a ring form to form a ring gas, which reduces the attenuation speed of the core section of the oxygen jet and strengthens the length of the core section of the oxygen jet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present drawings 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 only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 The overall structure diagram of a non-contact temperature measurement system for detecting the temperature of molten steel in the steelmaking process;

[0027] Figure 2 This is a schematic structural diagram of the non-contact temperature measuring device provided by the present invention.

[0028] In the figure: 1, electric arc furnace; 11, flue; 2, steam generator; 21, spiral heating coil; 3, water electrolysis system; 31, water electrolysis device; 32, electrolytic cell; 4, piston-type oxygen compression device; 41, first piston; 42, first steam receiving chamber; 43, oxygen receiving chamber; 5, piston-type hydrogen compression device; 51, second piston; 52, second steam receiving chamber; 53, hydrogen receiving chamber; 6, non-contact temperature measuring device; 61, Main oxygen jet pipeline; 611, pipeline inlet; 612, pipeline shrinkage; 613, pipeline outlet; 62, epoxy jet pipeline; 63, temperature measuring inner tube; 631, temperature measuring probe; 632, probe inner tube cooling cavity; 633, cooling water inlet pipeline; 634, cooling water outlet pipeline; 64, ring hydrogen jet pipeline; 7, water supply tank; 8, electrolytic cell exhaust steam pipeline; 9, oxygen delivery pipeline; 91, gas storage tank; 92, multi-point balanced heat exchanger. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0030] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0031] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0032] See also Figure 1As shown, the non-contact temperature measurement system for detecting the temperature of molten steel in the steelmaking process in the embodiment of the present invention includes an arc furnace 1, a steam generator 2, an electrolytic water system 3, a piston-type oxygen compression device 4, a piston-type hydrogen compression device 5 and a plurality of non-contact temperature measurement devices 6. The electrolytic water system 3 includes an electrolytic water device 31 and an electrolytic cell 32, and the electrolytic water device 31 is arranged in the electrolytic cell 32. The piston-type oxygen compression device 4 is isolated by a first piston 41 to form a first steam receiving chamber 42 and an oxygen receiving chamber 43. The first steam receiving chamber 42 is connected to the steam generator 2, and the oxygen receiving chamber 43 is connected to the positive end of the electrolytic water device 31. The piston-type hydrogen compression device 5 is isolated by a second piston 51 to form a second steam receiving chamber 52 and a hydrogen receiving chamber 53. The second steam receiving chamber 52 is connected to the steam generator 2, and the hydrogen receiving chamber 53 is connected to the negative end of the electrolytic water device 31. One end of the plurality of non-contact temperature measuring devices 6 is respectively connected to the oxygen containing chamber 43 and the hydrogen containing chamber 53 , and the other end is connected to the interior of the electric arc furnace 1 .

[0033] The steam generator 2 generates steam and delivers it to the first steam receiving chamber 42 and the second steam receiving chamber 52 respectively, so as to work the first piston 41 and the second piston 51 and push the first piston 41 and the second piston 51 to compress the gas in the oxygen receiving chamber 43 and the hydrogen receiving chamber 53. The water electrolysis device 31 electrolyzes the water in the electrolytic cell 32 to generate oxygen and hydrogen. The positive end of the water electrolysis device 31 generates oxygen and then delivers it to the oxygen receiving chamber 43 through a pipeline, while the negative end generates hydrogen and then delivers it to the hydrogen receiving chamber 53 through a pipeline. The oxygen in the oxygen receiving chamber 43 is compressed under the push of the first piston 41, and after being released, the high-pressure oxygen enters the non-contact temperature measuring device 6 to form a high-pressure oxygen jet and sprays it to the molten pool in the electric arc furnace 1 to purge the slag on the surface of the molten pool, thereby improving the temperature measurement accuracy of the non-contact temperature measuring device 6. The hydrogen in the hydrogen receiving chamber 53 is compressed and stored under the push of the second piston 51. When the slag layer is thick during steelmaking in the electric arc furnace 1 and it is difficult to blow away the slag layer using conventional oxygen jets or the blowing effect is not obvious, the outlet valve of the hydrogen containing chamber 53 is opened, and the high-pressure hydrogen is released to enter the non-contact temperature measuring device 6 to supplement the oxygen jet.

[0034] The pipeline between the steam generator 2 and the first steam receiving chamber 42 and the second steam receiving chamber 52 is provided with a pressure gauge of the steam generator 2 gas supply main pipeline and a steam emergency pressure relief valve. The pressure gauge is used to monitor the air pressure in the steam supply main pipeline. When the air pressure exceeds the rated air pressure value, the steam emergency pressure relief valve opens to release the pressure to prevent the pressure from exceeding the critical value and causing safety risks such as explosion.

[0035] The temperature measurement system may be provided with a water supply tank 7 for supplying water to the steam generator 2 and the electrolytic cell 32 respectively.

[0036] In one embodiment, a large amount of high-temperature and high-pressure water vapor is generated in the steam generator 2, the valve of the air inlet pipeline of the first steam receiving chamber 42 is opened, and the valve of the air inlet pipeline of the second steam receiving chamber 52 is closed, and the high-temperature and high-pressure water vapor enters the first steam receiving chamber 42, squeezes and pushes the first piston 41 to move and compresses the oxygen in the oxygen receiving chamber 43. When the oxygen pressure reaches the set value as observed by the pressure gauge in the oxygen receiving chamber 43, the valve of the air inlet pipeline of the first steam receiving chamber 42 is closed, and the movement of the first piston 41 stops. At this time, the valve of the air outlet pipeline of the oxygen receiving chamber 43 is opened, and the high-pressure oxygen enters the non-contact temperature measuring device 6 as a purge airflow to blow away the slag layer, expose the molten steel, and improve the temperature measurement accuracy of the non-contact temperature measuring device 6. This process can be used in the early and late stages of smelting of the electric arc furnace 1 to improve the temperature measurement accuracy when the slag layer thickness is small. After the oxygen in the oxygen containing chamber 43 is completely discharged, the valve of the air outlet pipe of the oxygen containing chamber 43 is closed, and the valve of the air inlet pipe of the oxygen containing chamber 43 is opened. The electrolytic water device 31 electrolyzes oxygen to supply oxygen to the oxygen containing chamber 43, and the oxygen pushes the first piston 41 back to its original position to prepare for the next round of oxygen compression.

[0037] For further information, see Figure 1 and Figure 2 As shown, the non-contact temperature measuring device 6 includes a main oxygen jet pipe 61, an epoxy jet pipe 62 and a temperature measuring inner pipe 63, and the temperature measuring inner pipe 63 is used to measure the temperature of the molten steel. After the main oxygen jet pipe 61 receives the oxygen from the oxygen containing chamber 43, most of the oxygen forms a high-pressure oxygen jet and is ejected from the output port end, and a small part of the oxygen enters through the input end of the epoxy jet pipe 62, and is output as a ring gas under the restriction of the annular inner cavity of the epoxy jet pipe 62. The ring gas restricts the core section of the oxygen jet at the periphery of the core section, slows down the attenuation of the oxygen jet, and plays a role in maintaining the length and penetration of the core section of the jet.

[0038] Specifically, the main oxygen jet pipeline 61 is a nozzle structure composed of a pipeline inlet 611, a pipeline constriction 612 and a pipeline outlet 613. The main oxygen jet pipeline 61 forms a Laval nozzle through a structure that gradually contracts and expands, which accelerates the flow rate of the oxygen gas flow and enables the oxygen jet to be ejected in a supersonic state. After the slag is blown away by the oxygen jet, the temperature probe 631 in the temperature measuring inner tube 63 can rely on its infrared temperature measuring device to capture the high-temperature radiation signal of the molten steel, and due to the purging and clearing effect of the supersonic oxygen jet, there is no interference from any external factors such as smoke, smoke and slag layer on the path of signal capture, and the temperature signal of the molten steel captured by the temperature probe 631 is true and reliable.

[0039] In one embodiment, the non-contact temperature measuring device 6 further includes a ring hydrogen jet pipe 64, which is arranged around the periphery of the main oxygen jet pipe 61. When the slag layer is thick during the steelmaking process of the electric arc furnace 1, it is difficult to blow away the slag layer or the slag blowing effect is not obvious using a conventional oxygen jet, it is necessary to use a ring hydrogen coherent jet to increase the slag blowing strength of the purge airflow.

[0040] The oxygen jet formation part in this embodiment is the same as the process in the above embodiment, and will not be described in detail here. High-temperature and high-pressure water vapor is generated in the steam generator 2, and the valve of the air inlet pipe of the second steam receiving chamber 52 is opened, and the high-temperature and high-pressure water vapor enters the second steam receiving chamber 52 at the same time, squeezing and pushing the second piston 51 to move and compressing the hydrogen in the hydrogen receiving chamber 53. When the hydrogen pressure reaches the set value as observed by the pressure gauge in the hydrogen receiving chamber 53, the valve of the air inlet pipe of the second steam receiving chamber 52 is closed, and the movement of the second piston 51 stops. At this time, the valve of the air outlet pipe of the hydrogen receiving chamber 53 is opened, and the high-pressure hydrogen enters the annular hydrogen jet pipe 64 in the non-contact temperature measuring device 6, and is output as annular gas under the restriction of the annular inner cavity of the annular hydrogen jet pipe 64. The annular hydrogen gas and the epoxy gas output by the epoxy jet pipe 62 undergo a combustion reaction at high temperature, forming a more powerful energy confinement area outside the core section of the high-pressure oxygen jet, and improving the core section length and penetration of the oxygen jet. This process can be used to improve the temperature measurement accuracy when the thickness of the slag layer is large in the middle stage of smelting of the electric arc furnace 1.

[0041] After the hydrogen in the hydrogen containing chamber 53 is completely discharged, the valve of the gas outlet pipe of the hydrogen containing chamber 53 is closed, and the valve of the gas inlet pipe of the hydrogen containing chamber 53 is opened. The water electrolysis device 31 electrolyzes and generates hydrogen to supply hydrogen to the hydrogen containing chamber 53. The hydrogen pushes the second piston 51 back to its original position to prepare for the next round of hydrogen compression.

[0042] Furthermore, the purge airflow arrangement in the non-contact temperature measuring device 6 can be based on the purge airflow requirements of the smelting site, and a multi-layer design of main oxygen-epoxy-cyclic hydrogen and main oxygen-epoxy-cyclic hydrogen-epoxy from the inside to the outside can be selected. At the same time, multiple main oxygen jet pipes 61 can also be set, but this does not affect the purpose of this structure to increase the length and penetration of the core section of the purge airflow.

[0043] The temperature measuring inner tube 63 includes a temperature measuring probe 631, a probe inner tube cooling cavity 632, a cooling water inlet pipe 633 and a cooling water outlet pipe 634. The temperature signal of the molten steel captured by the temperature measuring probe 631 can be converted into a digital signal representing the online real-time temperature of the molten steel through the temperature measuring signal transmission channel and the temperature measuring signal processing and output device. The on-site smelting operator can clearly know the online real-time temperature of the molten steel in the steelmaking process of the electric arc furnace 1 according to the signal, which is convenient for optimizing and improving the process operations such as oxygen and power supply, auxiliary material blowing, furnace door slag flow, and end point control during the smelting process.

[0044] Considering that the non-contact temperature measuring device 6 is in contact with the high temperature environment in the arc furnace 1 for a long time, it is easy to have problems such as overheating damage caused by excessive temperature and large temperature measurement error of molten steel, so a probe inner tube cooling cavity 632 is designed, and the probe inner tube cooling cavity 632 is provided with flowing cooling water by a cooling water inlet pipe 633. The cooling water cools down the temperature measuring element of the temperature measuring probe 631 for protection, and the cooling water is discharged through the cooling water outlet pipe 634 after the temperature of the cooling water rises.

[0045] When the steelmaking process of the electric arc furnace 1 requires continuous online temperature measurement, the required cooling water flow rate is large, so the cooling water inlet pipe 633 can be connected to the water supply tank 7 to ensure sufficient water supply. At the same time, the cooling water outlet pipe 634 can be connected to the electrolytic cell 32 to directly supply the cooling water with increased temperature to the electrolytic water device 31 to improve the efficiency of electrolytic water (the higher the electrolytic water temperature, the higher the efficiency).

[0046] The temperature measurement system also includes an electrolytic cell exhaust steam pipeline 8 and an oxygen delivery pipeline 9, and the oxygen delivery pipeline 9 performs heat exchange with the electrolytic cell exhaust steam pipeline 8. High-temperature and high-pressure water vapor is generated in the steam generator 2, and the valve of the steam generator 2 gas supply main pipeline is opened, and the high-temperature and high-pressure water vapor enters the first steam receiving chamber 42 and the second steam receiving chamber 52, respectively squeezing and pushing the first piston 41 and the second piston 51 to move and compress the internal gas. At this time, the valve of the electrolytic cell exhaust steam pipeline 8, the valve of the oxygen delivery pipeline 9, and the valve of the hydrogen delivery pipeline are closed. When the gas pressure reaches the set requirement through the pressure gauge of the oxygen receiving chamber 43 and the hydrogen receiving chamber 53, the first piston 41 and the second piston 51 also move to a certain position between the port of the electrolytic cell exhaust steam pipeline 8 and the port of the oxygen delivery pipeline 9, and between the port of the electrolytic cell exhaust steam pipeline 8 and the port of the hydrogen delivery pipeline.

[0047] After the high-pressure gas in the oxygen receiving chamber 43 and the hydrogen receiving chamber 53 is discharged to a rated amount, the pipeline valve of the electrolytic cell exhaust steam pipeline 8, the pipeline valve of the oxygen delivery pipeline 9, and the pipeline valve of the hydrogen delivery pipeline are opened, and the pipeline valve at the outlet of the oxygen receiving chamber 43 and the pipeline valve at the outlet of the hydrogen receiving chamber 53 are closed. Oxygen is supplied to the oxygen receiving chamber 43 through the oxygen delivery pipeline 9 and works on the first piston 41 to push the first piston 41 to move toward the first steam receiving chamber 42. Hydrogen is supplied to the hydrogen receiving chamber 53 through the hydrogen delivery pipeline and works on the second piston 51 to push the second piston 51 to move toward the second steam receiving chamber 52. During the movement of the first piston 41 and the second piston 51, steam as exhaust steam enters from the electrolytic cell exhaust steam pipeline 8 and merges into the electrolytic cell 32 until the first piston 41 and the second piston 51 are pushed to their original positions. At this time, the pipeline valve of the electrolytic cell exhaust steam pipeline 8, the pipeline valve of the oxygen delivery pipeline 9, and the pipeline valve of the hydrogen delivery pipeline are closed to prepare for the next round of oxygen compression.

[0048] The oxygen delivery pipeline 9 includes a gas tank 91 and a multi-point balanced heat exchanger 92 which are connected in sequence along the oxygen output direction. The valve of the oxygen output pipeline of the electrolytic cell 32 is opened, and the oxygen generated by the positive electrode plate of the electrolytic water enters the gas tank 91 through the oxygen output pipeline of the electrolytic cell 32. When the non-contact temperature measuring device 6 does not need to purge the airflow, the pipeline valve at the outlet end of the gas tank 91 is closed, and the oxygen will be gradually stored in the gas tank 91 for subsequent use. When the non-contact temperature measuring device 6 needs to purge the airflow, the pipeline valve at the outlet end of the gas tank 91 is opened, and the oxygen enters the multi-point balanced heat exchanger 92, and the high-temperature exhaust steam in the exhaust steam pipeline 8 of the electrolytic cell is exchanged with the wall in the multi-point balanced heat exchanger 92, which can increase the temperature of the oxygen and preheat the oxygen. On the one hand, the compressed oxygen in the oxygen containing chamber 43 can reach the set pressure value in advance, and on the other hand, the penetration of the core section of the oxygen jet can be improved.

[0049] A flue 11 is connected to the side wall of the electric arc furnace 1 , and a spiral heating coil 21 is arranged in the steam generator 2 . The spiral heating coil 21 is wound around the periphery of the flue 11 and both ends of the spiral heating coil 21 are connected to the inside of the steam generator 2 .

[0050] The steelmaking in the electric arc furnace 1 is a complex process of high temperature and multiphase. During the smelting process, the oxygen supply and power supply, carbon powder and natural gas injection and other operations generate a large amount of flue gas in the process of strengthening the energy input of the molten pool and melting the metal charge. The high-temperature flue gas of 1000℃~1450℃ generated in the electric arc furnace 1 enters the flue 11, and heat exchanges with the spiral heating coil 21 when passing through the spiral heating coil 21 attached to the periphery of the flue 11, and is used to heat the water flowing in the spiral heating coil 21. At this time, the water outlet pipeline pump of the water supply tank 7, the valves before and after the water outlet pipeline pump, the water supply pipeline valve of the steam generator 2 and the water supply pipeline valve of the electrolytic cell 32 are opened, and the water from the water supply tank 7 enters the steam generator 2 and the electrolytic cell 32 respectively. After the water volume in the steam generator 2 and the electrolytic cell 32 is maintained at an appropriate position, the opening of the water supply pipeline valve of the steam generator 2 and the water supply pipeline valve of the electrolytic cell 32 are reduced to ensure that the amount of water supplied is equal to the amount of water consumed by the steam generator 2 and the electrolytic cell 32 respectively. The water inside the steam generator 2 is continuously heated and evaporated in the spiral heating coil 21 , ensuring that the steam generator 2 continuously generates high-temperature and high-pressure water vapor, making full use of the waste heat of the high-temperature flue gas generated by the electric arc furnace 1 .

[0051] It should be noted here that the shape of the spiral heating coil 21 can be a spiral coil to improve the efficiency of heat exchange, but the present application does not limit the specific shape of the spiral heating coil 21. Any changes to the shape of the spiral heating coil 21 on this basis should be within the scope of protection of the present application.

[0052] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process, characterized in that: include: Electric arc furnace (1); Steam generator (2); A water electrolysis system (3), comprising a water electrolysis device (31) and an electrolysis cell (32), wherein the water electrolysis device (31) is arranged in the electrolysis cell (32); A piston-type oxygen compression device (4), which is isolated by a first piston (41) to form a first steam receiving chamber (42) and an oxygen receiving chamber (43), wherein the first steam receiving chamber (42) is connected to the steam generator (2), and the oxygen receiving chamber (43) is connected to the positive terminal of the water electrolysis device (31); A piston-type hydrogen compression device (5), which is isolated by a second piston (51) to form a second steam receiving chamber (52) and a hydrogen receiving chamber (53), wherein the second steam receiving chamber (52) is connected to the steam generator (2), and the hydrogen receiving chamber (53) is connected to the negative terminal of the water electrolysis device (31); A plurality of non-contact temperature measuring devices (6), one end of each of the non-contact temperature measuring devices (6) being connected to the oxygen containing chamber (43) and the hydrogen containing chamber (53) respectively, and the other end of each of the non-contact temperature measuring devices (6) being connected to the interior of the electric arc furnace (1).

2. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 1, characterized in that: The non-contact temperature measuring device (6) comprises a main oxygen jet pipe (61), an epoxy jet pipe (62) and a temperature measuring inner pipe (63); the input end of the main oxygen jet pipe (61) is connected to the oxygen containing chamber (43); the temperature measuring inner pipe (63) is used to measure the temperature; and the epoxy jet pipe (62) is arranged around the periphery of the main oxygen jet pipe (61) and one end of the epoxy jet pipe is connected to the main oxygen jet pipe (61).

3. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 2, characterized in that: The main oxygen jet pipeline (61) is a nozzle structure consisting of a pipeline inlet (611), a pipeline constriction (612) and a pipeline outlet (613).

4. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 2, characterized in that: The non-contact temperature measuring device (6) further comprises a ring hydrogen jet pipe (64), wherein the ring hydrogen jet pipe (64) is arranged around the periphery of the main oxygen jet pipe (61), and one end of the ring hydrogen jet pipe (64) is connected to the hydrogen containing chamber (53) and the other end is connected to the inside of the electric arc furnace (1).

5. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 2, characterized in that: The temperature measuring inner tube (63) comprises a temperature measuring probe (631), a probe inner tube cooling cavity (632), a cooling water inlet pipe (633) and a cooling water outlet pipe (634), and the cooling water inlet pipe (633) and the cooling water outlet pipe (634) are respectively connected to the probe inner tube cooling cavity (632).

6. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 5, characterized in that: It also includes a water supply box (7), which is used to supply water to the steam generator (2) and the electrolytic cell (32), respectively. The cooling water inlet pipe (633) is connected to the water supply box (7), and the cooling water outlet pipe (634) is connected to the electrolytic cell (32).

7. The non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 1, characterized in that: It also includes an electrolytic cell exhaust steam pipeline (8) and an oxygen delivery pipeline (9), wherein one end of the electrolytic cell exhaust steam pipeline (8) is connected to the electrolytic cell (32) and the other end is respectively connected to the first steam receiving chamber (42) and the second steam receiving chamber (52), and the oxygen delivery pipeline (9) is used to connect the electrolytic cell (32) with the oxygen receiving chamber (43), and the oxygen delivery pipeline (9) performs heat exchange with the electrolytic cell exhaust steam pipeline (8).

8. A non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 7, characterized in that: The oxygen delivery pipeline (9) comprises a gas storage tank (91) and a multi-point balanced heat exchanger (92) which are sequentially connected along the oxygen output direction, and the path of the electrolytic cell exhaust steam pipeline (8) passes through the multi-point balanced heat exchanger (92).

9. The non-contact temperature measurement system for detecting the temperature of molten steel in a steelmaking process according to claim 1, characterized in that: A flue (11) is connected to the side wall of the electric arc furnace (1), and a spiral heating coil (21) is arranged in the steam generator (2). The spiral heating coil (21) is wound around the periphery of the flue (11) and has two ends respectively connected to the interior of the steam generator (2).

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