Negative pressure balancing device for water supply and return pipes, oxygen lance return device and oxygen lance return control system

Abstract

The present invention provides a sealed negative pressure balancing device for water supply and return pipes, an oxygen lance return pipe, and an oxygen lance return pipe control system. The negative pressure balancing device for water supply and return pipes includes: a water flow device having a water flow channel disposed therein; a water inlet pipe having a water outlet connected to the head end of the water flow channel of the water supply device; a return pipe including a vertically extending descending pipe and a horizontally extending horizontal pipe, the water inlet end of the horizontal pipe connected to the tail end of the water flow channel; a negative pressure relief valve disposed at the upper end of the descending pipe; and a controller electrically connected to the negative pressure relief valve. The controller controls the opening or closing of the negative pressure relief valve based on water flow information obtained from the water flow device, the water inlet pipe, or the return pipe. The controller controls the opening of the negative pressure relief valve to cause negative pressure in the return pipe. When negative pressure occurs in the return pipe, air is added to the return pipe through the negative pressure relief valve to maintain a positive pressure in the return pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of oxygen lance equipment, and particularly relates to a negative pressure balancing device for water supply and return pipes, an oxygen lance return device, and an oxygen lance return control system. Background Art

[0002] In social production, some large equipment requires water circulation pipes, and the water flow of the inlet and outlet pipes in the circulation pipes needs to be controlled and monitored; however, when the outlet pipe extends in the up and down directions and has a large height difference, the water in the outlet pipe flows downward and forces a negative pressure to form in the outlet pipe, that is, a "siphon" phenomenon occurs, which makes the water in the outlet pipe unable to be full, resulting in a large error in measuring the water flow in the inlet and outlet pipes, making the measured return water flow in the outlet pipe higher than the inlet water flow in the inlet pipe, and the measurement distortion causes the interlocking alarm system to fail to work. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, an object of the present invention is to provide a negative pressure balancing device for water supply and return pipes.

[0005] Another object of the present invention is to provide a corresponding oxygen lance water return device.

[0006] Another object of the present invention is to provide an oxygen lance water return control system.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a negative pressure balancing device for water supply and return pipes, including: a water flow device, a water flow channel is provided in the water flow device; a water inlet pipe, the water outlet end of the water inlet pipe is connected to the head end of the water flow channel of the water flow device; a return pipe, the return pipe includes a descending pipe extending in the up and down directions and a horizontal pipe extending in the horizontal direction, which are interconnected, and the water inlet end of the horizontal pipe is connected to the tail end of the water flow channel; a negative pressure relief valve is provided at the upper end of the descending pipe; a controller is electrically connected to the negative pressure relief valve, and the controller controls the opening or closing of the negative pressure relief valve according to the water flow information obtained from the water flow device, the water inlet pipe or the return pipe.

[0008] According to the negative pressure balancing device for water supply and return pipes proposed by the present invention, a water flow channel for water flow is provided in the water flow device, so that water can flow in the water flow device through the water flow channel. Specifically, the water in the water inlet pipe is connected to the head end and the tail end of the flow channel through the water inlet pipe and the return pipe respectively, so that the water in the water inlet pipe can flow into the flow channel in the water flow device and enter the return pipe through the flow channel. Specifically, the return pipe includes a descending pipe extending in the vertical direction and a horizontal pipe extending in the horizontal direction. The water in the water flow device first flows into the horizontal pipe through the flow channel and then enters the descending pipe to flow downward. Furthermore, a negative pressure relief valve is provided at the upper end of the descending pipe. When the negative pressure relief valve is opened, the descending pipe is connected to the large pipe through the negative pressure relief valve. Gas connection; the negative pressure balancing device for the water supply and return pipes is also provided with a controller electrically connected to the negative pressure relief valve. The controller controls the opening or closing of the negative pressure relief valve according to the water flow information obtained from the water flow device or the water inlet pipe or the return pipe. Specifically, when the water in the return pipe flows downward, the downward flow of the water in the return pipe will force a negative pressure to form in the return pipe. At this time, the controller controls the negative pressure relief valve to open, so that the return pipe is connected to the atmosphere through the negative pressure relief valve, and the air in the atmosphere enters the return pipe through the negative pressure relief valve, which solves the problem of negative pressure in the return pipe and keeps the return pipe in a positive pressure state, thereby reducing the error between the water flow measurement result of the inlet pipe and the water flow measurement result of the return pipe due to the negative pressure in the return pipe.

[0009] In detail, the discharge port of the negative pressure relief valve is connected to the atmosphere, so that when the water height difference in the return pipe is formed, the suction physical effect is generated through the negative pressure relief valve so that no negative pressure is formed in the cooling water return pipe, thereby achieving the purpose of negative pressure relief, eliminating the siphoning and negative pressure state of the medium in the pipe, and avoiding the damage and falling off of the lining of the electromagnetic flowmeter installed on the return pipe, the degradation of the insulation of the measuring coil, and the scrapping of the electromagnetic flowmeter.

[0010] It should be noted that the water transfer device may be a tank-shaped device with a water storage function, or a tube-shaped device with a heat dissipation function.

[0011] The above technical solution also includes a first electromagnetic flowmeter and a second electromagnetic flowmeter, which are respectively arranged on the water inlet pipe and the return pipe; wherein, when the controller obtains information about the water flow in the water inlet pipe or the return pipe, it controls the negative pressure relief valve to open; when the controller obtains information that the water in the water inlet pipe or the return pipe is not flowing, it controls the negative pressure relief valve to close.

[0012] In this technical solution, the first electromagnetic flowmeter and the second electromagnetic flowmeter can detect the water flow in the inlet pipe and the return pipe to obtain information about the water flow in the inlet pipe and the return pipe. By comparing the water flow information detected by the first electromagnetic flowmeter and the second electromagnetic flowmeter, it can be determined whether the water flow device is leaking. Specifically, when the water flow in the return pipe is less than the water flow in the inlet pipe, it indicates that the water flow device may be leaking. However, in actual application, if there is a large height difference between the upper and lower ends of the return pipe, the water in the return pipe will force a negative pressure to be generated in the return pipe when flowing downward. When the water flow in the inlet pipe and the return pipe is detected by a water flow detection instrument such as an electromagnetic flowmeter, the water flow data in the return pipe measured by the second electromagnetic flowmeter will be greater than the water flow data in the inlet pipe measured by the first electromagnetic flowmeter, causing distortion in the detection results. In this case, when the measured water flow in the return pipe is equal to the water flow in the inlet pipe, it indicates that some water has leaked from the water flow device. If production personnel are misled by the measurement results of the electromagnetic flowmeter, it may cause a safety hazard. Therefore, by arranging a negative pressure relief valve at the upper end of the descending pipe of the return pipe, and electrically connecting the negative pressure relief valve through a controller, when water flows in the return pipe, the water flow device or the water inlet pipe, negative pressure is generated in the return pipe, and the controller controls the negative pressure relief valve to open, connecting the return pipe with the outside atmosphere through the negative pressure relief valve, thereby solving the negative pressure situation in the pipe and keeping the measuring pipeline in a positive pressure state at all times, so as to reduce the measurement error of the first electromagnetic flowmeter and the second electromagnetic flowmeter caused by the negative pressure in the return pipe, improve the measurement accuracy, and enable the interlocking alarm system to function normally; when the water in the return pipe, the water flow device or the water inlet pipe is not flowing, the controller controls the negative pressure relief valve to close, so as to prevent the water in the return pipe from leaking through the negative pressure relief valve.

[0013] In the above technical solution, the return pipe also includes: an ascending pipe, and the second electromagnetic flowmeter is arranged on the ascending pipe; the horizontal pipe specifically includes: a first horizontal branch pipe, the first end of the first horizontal branch pipe is connected to the water outlet end of the water channel, and the second end of the first horizontal branch pipe is connected to the lower end of the ascending pipe; a second horizontal branch pipe, one end of the second horizontal branch pipe is connected to the upper end of the ascending pipe, and the other end is connected to the upper end of the descending pipe.

[0014] In this technical solution, the return pipe also includes a rising pipe, and the horizontal pipe specifically includes a first horizontal branch pipe and a second horizontal branch pipe. By setting the rising pipe, the first horizontal branch pipe, and the second horizontal branch pipe, the water flowing out of the water flow device first passes through the first horizontal branch pipe, and then enters the rising pipe and flows from bottom to top, so that the water in the rising pipe is in a more full pipe state. Therefore, the second electromagnetic flowmeter is installed on the rising pipe to make the water flow measured by the second electromagnetic flowmeter more accurate.

[0015] In the above technical solution, the controller is electrically connected to the first electromagnetic flowmeter to obtain water flow information of the water inlet pipe; or the controller is electrically connected to the second electromagnetic flowmeter to obtain water flow information of the return pipe.

[0016] In this technical solution, the controller is electrically connected to the first electromagnetic flowmeter or the second electromagnetic flowmeter, so that the controller can obtain measurement data of the first electromagnetic flowmeter or the second electromagnetic flowmeter, thereby obtaining water flow information in the water inlet pipe or the return pipe.

[0017] In the above technical solution, the water inlet end of the horizontal pipe is located above the water outlet end of the water inlet pipe; the length of the rising pipe is 3 meters, and the second electromagnetic flowmeter is located 2 meters above the lower end of the rising pipe.

[0018] In this technical solution, the water inlet end of the horizontal pipe is located above the water outlet end of the water inlet pipe, so that the water in the water flow channel of the water flow device flows from bottom to top, so as to facilitate the water in the water flow channel to be in a more full pipe state. Furthermore, the length of the rising pipe is 3 meters, and the second electromagnetic flowmeter is arranged 2 meters above the lower end of the rising pipe to improve the measurement accuracy of the second electromagnetic flowmeter.

[0019] The second technical solution of the present invention proposes an oxygen lance water return device, comprising: a water supply and return pipe negative pressure balancing device according to any one of the technical solutions of the first aspect; an oxygen lance; a water flow device in the water supply and return pipe negative pressure balancing device is arranged in the oxygen lance, wherein the oxygen flow in the oxygen lance passes through the water device and is ejected from the nozzle of the oxygen lance; the water in the water flow device exchanges heat with the oxygen in the oxygen lance during the flow from the water inlet end to the water outlet end of the water flow channel.

[0020] According to the oxygen lance water return device proposed by the present invention, a water flow device is arranged in the oxygen lance, so that the oxygen in the oxygen lance exchanges heat with the water in the water flow channel through the water flow device to reduce the temperature of the oxygen in the oxygen lance.

[0021] In the above technical solution, the water passing device is specifically a heat exchange pipe, and the oxygen in the oxygen lance exchanges heat with the cold water flowing through the heat exchange pipe through the heat exchange pipe.

[0022] In this technical solution, the water passing device is specifically a heat exchange pipe, and the heat exchange pipe is specifically tubular to increase the contact area between the oxygen in the oxygen lance and the water passing device, thereby improving the heat exchange efficiency.

[0023] The above technical solution also includes: a steelmaking furnace, the nozzle of the oxygen lance is connected to the steelmaking furnace to transport oxygen into the steelmaking furnace; a converter oxygen lance return water main pipe; the lower end of the descending pipe in the water supply and return water pipeline negative pressure balancing device is connected to the converter oxygen lance return water main pipe.

[0024] In this technical solution, the nozzle of the oxygen lance is connected to the steelmaking furnace, so that the oxygen lance sprays oxygen into the steelmaking furnace through the nozzle to increase the temperature inside the steelmaking furnace; the lower end of the downcomer is connected to the return water main pipe of the converter oxygen lance to realize the circulation of cooling water in the water inlet pipe and return water pipe.

[0025] A third technical solution of the present invention provides an oxygen lance water return control system, comprising: an oxygen lance water return device according to any one of the second technical solutions; a first temperature sensor, disposed on an inlet pipe in the oxygen lance water return device; a second temperature sensor, disposed on a return pipe in the oxygen lance water return device; a signal processing device, electrically connected to a first electromagnetic flowmeter, a second electromagnetic flowmeter, a first temperature sensor, and a second temperature sensor in the oxygen lance water return device, wherein a signal isolation device is provided in the signal processing device; a communication device, electrically connected to the signal processing device, and capable of sending an electrical signal to a controller in the oxygen lance water return device; wherein the controller is electrically connected to the oxygen lance, and the first electromagnetic flowmeter and the second electromagnetic flowmeter respectively transmit the acquired inlet flow rate and outlet flow rate, and the first temperature sensor and the second temperature sensor respectively transmit the acquired inlet water temperature and outlet water temperature in the form of electrical signals to the signal processing device, which are processed by the signal isolation device and then sent to the controller via the communication device. The controller controls the opening or closing of the oxygen lance according to the acquired water flow rate information and water temperature information.

[0026] In the above technical solution, the water inlet flow rate is less than or equal to 170m 3 / h, the controller controls the oxygen lance to be closed; or the outlet water temperature is greater than or equal to 55℃, the controller controls the oxygen lance to be closed; or the difference between the outlet water temperature and the inlet water temperature is greater than or equal to ≥20℃ and maintains for 4 seconds, the controller controls the oxygen lance to be closed; or the difference between the inlet water flow rate and the outlet water flow rate is ≥10m3 / h and maintains for 4 seconds, the controller controls the oxygen lance to be closed.

[0027] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are: a negative pressure relief valve is added to the return water pipe, and when negative pressure is generated in the return water pipe, the negative pressure relief valve is opened to connect the return water pipe with the atmosphere, and the air in the atmosphere enters the return water pipe through the negative pressure relief valve, so that the return water pipe maintains a positive pressure state, and the water flow data in the inlet pipe and the return water pipe measured by the first electromagnetic flowmeter and the second electromagnetic flowmeter are consistent, so that the interlocking alarm system can function normally according to the data measured by the first electromagnetic flowmeter and the second electromagnetic flowmeter, thereby promoting the safe production of converter steelmaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a negative pressure balancing device for water supply and return pipes according to an embodiment of the present invention is shown;

[0029] Figure 2 A schematic cross-sectional view of a water flow device according to an embodiment of the present invention is shown;

[0030] Figure 3 A schematic structural diagram of a negative pressure balancing device for water supply and return pipes according to an embodiment of the present invention is shown;

[0031] Figure 4 A schematic structural diagram of a negative pressure balancing device for water supply and return pipes according to an embodiment of the present invention is shown;

[0032] Figure 5 A schematic structural diagram of an oxygen lance water return device according to another embodiment of the present invention is shown;

[0033] Figure 6 A schematic structural diagram of the hardware device portion of an oxygen lance water return control system according to an embodiment of the present invention is shown;

[0034] Figure 7 A schematic diagram showing a medium supply system of an oxygen lance water return control system according to an embodiment of the present invention is shown;

[0035] Figure 8 A schematic diagram showing a medium supply system of an oxygen lance water return control system according to another embodiment of the present invention is shown;

[0036] Figure 9 A schematic structural diagram of an oxygen lance and a water flow device according to another embodiment of the present invention is shown.

[0037] The symbols in the figure are explained as follows:

[0038] 1 water flow device, 12 water flow channel, 2 water inlet pipe, 3 return pipe, 32 rising pipe, 34 descending pipe, 36 horizontal pipe, 362 first horizontal branch pipe, 364 second horizontal branch pipe, 4 negative pressure relief valve, 5 controller, 10 first electromagnetic flowmeter, 102 second electromagnetic flowmeter, 104 first temperature sensor, 106 second temperature sensor, 108 pressure transmitter, 60 oxygen lance, 602 inner pipe, 604 outer pipe, 606 nozzle, 62 steelmaking furnace, 64 converter oxygen lance return water main pipe, 70 signal processing device, 72 signal isolation device, 74 communication device. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention and their beneficial effects will be further described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1 、 Figure 2 In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a negative pressure balancing device for water supply and return pipes, which defines:

[0041] The negative pressure balancing device for water supply and return pipes includes: a water flow device 1, a water inlet pipe 2, a return pipe 3, a negative pressure relief valve 4, and a controller 5; specifically, a water flow channel 12 for water supply is provided in the water flow device 1, so that water can flow in the water flow device 1 through the water flow channel 12, and the water inlet pipe 2 and the return pipe 3 are respectively connected to the head end and the tail end of the water flow channel 12, so that the water in the water inlet pipe 2 can flow into the water flow channel 12 in the water flow device 1, and enter the return pipe 3 through the water flow channel 12; further, the return pipe 3 includes a downpipe 34 extending in the vertical direction, and a horizontal pipe 36 extending in the horizontal direction; wherein the water inlet end of the horizontal pipe 36 is connected to the tail end of the water flow channel 12, and the water outlet end of the horizontal pipe 36 is connected to the downpipe 34. The water in the water flow device 1 first flows into the horizontal pipe 36 through the water flow channel 12 and then into the downpipe 34 to flow downward. Furthermore, a negative pressure relief valve 4 is provided at the upper end of the downpipe 34. When the negative pressure relief valve 4 is opened, the downpipe 34 is connected to the atmosphere through the negative pressure relief valve 4. Figure 3 As shown, the controller 5 is electrically connected to the negative pressure relief valve 4. The controller 5 controls the opening or closing of the negative pressure relief valve 4 according to the water flow information obtained from the water flow device 1 or the water inlet pipe 2 or the return pipe 3. Specifically, when the water in the return pipe 3 flows downward, the downward flow of the water in the return pipe 3 will force a negative pressure to form in the return pipe 3. At this time, the controller 5 controls the negative pressure relief valve 4 to open, so that the return pipe 3 is connected to the atmosphere through the negative pressure relief valve 4, and the air in the atmosphere enters the return pipe 3 through the negative pressure relief valve 4, thereby solving the problem of negative pressure in the return pipe 3 and keeping the return pipe 3 in a positive pressure state, thereby reducing the error between the water flow measurement results of the water inlet pipe 2 and the water flow measurement results of the return pipe 3 due to the negative pressure in the return pipe 3.

[0042] It should be noted that the water flow device 1 can be a tank-shaped device with a water storage function, or a tube-shaped device with a heat dissipation function.

[0043] like Figure 4As shown, further, the negative pressure balancing device for the water supply and return pipes also includes: a first electromagnetic flowmeter 10 and a second electromagnetic flowmeter 102. The first electromagnetic flowmeter 10 is arranged on the water inlet pipe 2, and the second electromagnetic flowmeter 102 is arranged on the return pipe 3. The first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 can detect the water flow in the water inlet pipe 2 and the return pipe 3 to obtain information on the water flow in the water inlet pipe 2 and the return pipe 3. By comparing the water flow information detected by the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102, it can be understood whether there is a water leak in the water flow device 1. Specifically, when the water flow in the return pipe 3 is less than the water flow in the water inlet pipe 2, it indicates that there may be a water leak in the water flow device 1. However, in In actual applications, if there is a large height difference between the upper and lower ends of the return pipe 3, the water in the return pipe 3 will force a negative pressure to be generated in the return pipe 3 when flowing downward. When the water flow in the inlet pipe 2 and the return pipe 3 is detected by a water flow detection instrument such as an electromagnetic flowmeter, the water flow data in the return pipe 3 measured by the second electromagnetic flowmeter 102 is greater than the water flow data in the inlet pipe 2 measured by the first electromagnetic flowmeter 10, causing the detection result to be distorted. In this case, when the measured water flow in the return pipe 3 is equal to the water flow in the inlet pipe 2, it means that some water has leaked from the water flow device 1. The interlocking alarm system is misled by the measurement results of the electromagnetic flowmeter and cannot issue an alarm in time, which may cause a safety hazard. Therefore, by arranging a negative pressure relief valve 4 at the upper end of the descending pipe 34 of the return water pipe 3, and electrically connecting the negative pressure relief valve 4 through the controller 5, when water flows in the return water pipe 3 or the water flow device 1 or the water inlet pipe 2, negative pressure is generated in the return water pipe 3, and the controller 5 controls the negative pressure relief valve 4 to open, connecting the return water pipe 3 with the outside atmosphere through the negative pressure relief valve 4, thereby solving the negative pressure situation in the pipe, so that the measuring pipeline is always kept in a positive pressure state, so as to reduce the measurement error of the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 caused by the negative pressure in the return water pipe 3, improve the measurement accuracy, and enable the interlocking alarm system to function normally; when the water in the return water pipe 3 or the water flow device 1 or the water inlet pipe 2 is not flowing, the controller 5 controls the negative pressure relief valve 4 to close, so as to prevent the water in the return water pipe 3 from leaking through the negative pressure relief valve 4.

[0044] like Figure 4As shown, further, in order to make the detection of the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 more accurate, the liquid in the water inlet pipe 2 and the return pipe 3 at the positions where the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 are located is in a full pipe state, and the return pipe 3 is specifically provided with: an ascending pipe 32, a descending pipe 34, a first horizontal branch pipe 362, and a second horizontal branch pipe 364, wherein the water inlet end of the first horizontal branch pipe 362 is connected to the water flow channel 12 of the water flow device 1, the water outlet end of the first horizontal branch pipe 362 is connected to the lower end of the ascending pipe 32, and the two ends of the second horizontal branch pipe 364 are respectively connected to the upper ends of the ascending pipe 32 and the descending pipe 34. The water flowing out of the water flow device 1 first passes through the first horizontal branch pipe 362 and then enters the ascending pipe 32 and flows from the bottom to the top, so that the water in the ascending pipe 32 is in a more full pipe state. The second electromagnetic flowmeter 102 is arranged on the ascending pipe 32, so that the water flow measured by the second electromagnetic flowmeter 102 is more accurate.

[0045] like Figure 3 As shown, further, the controller 5 is electrically connected to the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102, so that the controller 5 can obtain measurement data of the first electromagnetic flowmeter 10 or the second electromagnetic flowmeter 102, thereby obtaining water flow information in the water inlet pipe 2 or the return pipe 3.

[0046] Furthermore, the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 are respectively installed vertically on the water inlet pipe 2 and the return pipe 3 to ensure that the medium flows from bottom to top, thereby ensuring that the pipe is fully full, which can prevent the residual bubbles and the liquid two-phase medium from causing uneven two-phase distribution or phase separation when the flow rate is low, and make the lining wear around the pressure transmitter 108 provided on the water inlet pipe 2 and the return pipe 3 more uniform, so as to reduce the additional measurement error caused thereby, improve the measurement accuracy, and extend the service life of the electromagnetic flowmeter.

[0047] like Figure 3 and Figure 4 As shown, in a specific embodiment, the water inlet end of the horizontal pipe 36 is located above the water outlet end of the water inlet pipe 2, so that the water in the water flow channel 12 of the water flow device 1 flows from bottom to top, so as to facilitate the water in the water flow channel 12 to be in a more full pipe state. Furthermore, the length of the rising pipe 32 is 3 meters, and the second electromagnetic flowmeter 102 is arranged 2 meters above the lower end of the rising pipe 32 to improve the measurement accuracy of the second electromagnetic flowmeter 102.

[0048] like Figure 5 As shown, another embodiment of the present invention provides an oxygen lance water return device, which defines:

[0049] The oxygen lance water return device includes: a water supply and return pipe negative pressure balancing device, and an oxygen lance 60; wherein, the water flow device 1 in the water supply and return pipe negative pressure balancing device is arranged in the oxygen lance 60, so that the oxygen in the oxygen lance 60 exchanges heat with the water in the water flow channel 12 through the water flow device 1 to reduce the temperature of the oxygen in the oxygen lance 60.

[0050] like Figure 9 As shown, in a specific embodiment, the oxygen lance 60 includes an inner tube 602 and an outer tube 604, wherein the inner tube 602 is arranged in the outer tube 604, and a water flow channel 12 is formed between the outer wall of the inner tube 602 and the inner wall of the outer tube 604. A channel for oxygen flow is provided in the inner tube 602, and a nozzle 606 is provided at the lower end of the inner tube 602. Oxygen or nitrogen can be sprayed from the nozzle 606. The water inlet pipe 2 and the return water pipe 3 are respectively connected to the water flow channel 12, and the water inlet pipe 2 is located below the return water pipe 3, so that the cooling water flows from bottom to top in the water flow channel 12 and exchanges heat with the oxygen or nitrogen in the inner tube 602 through the tube wall of the inner tube 602, so as to reduce the temperature of the inner tube 602 and the nozzle 606, thereby reducing the temperature of the oxygen lance 60.

[0051] like Figure 5 As shown, further, the water passing device 1 is specifically a heat exchange pipe, and specifically the heat exchange pipe is tubular to increase the contact area between the oxygen in the oxygen lance 60 and the water passing device 1, thereby improving the heat exchange efficiency.

[0052] Furthermore, the oxygen lance water return device also includes: a steelmaking furnace 62 and a converter oxygen lance water return main pipe 64; specifically, the nozzle 606 of the oxygen lance 60 is connected to the steelmaking furnace 62 to transport oxygen into the steelmaking furnace 62 to increase the temperature inside the steelmaking furnace 62; the converter oxygen lance water return main pipe 64; the lower end of the downcomer 34 in the water supply and return pipe negative pressure balancing device is connected to the converter oxygen lance water return main pipe 64, realizing the circulation of cooling water in the water inlet pipe 2 and the return pipe 3.

[0053] like Figure 6 and Figure 7 As shown, another embodiment of the present invention provides an oxygen lance water return control system, comprising:

[0054] The oxygen lance water return device in the above embodiment; the first temperature sensor 104 is provided on the water inlet pipe 2 in the oxygen lance water return device; the second temperature sensor 106 is provided on the return pipe 3 in the oxygen lance water return device, the first temperature sensor 104 and the second temperature sensor 106 are specifically resistance rods, and the water temperatures of the water inlet pipe 2 and the return pipe 3 are detected by the first temperature sensor 104 and the second temperature sensor 106 to obtain the inlet water temperature and outlet water temperature of the water flow channel 12 in the water flow device 1; preferably, the first temperature sensor 104 is provided at one end of the water inlet pipe 2 close to the water flow device 1, and the second temperature sensor 106 is provided at one end of the return pipe 3 close to the water flow device 1, so as to reduce the detection error between the inlet water temperature and the outlet water temperature in the water flow channel caused by heat dissipation of the water due to the pipe wall.

[0055] like Figure 8 As shown, further, the signal processing device 70 is electrically connected to the first electromagnetic flowmeter 10, the second electromagnetic flowmeter 102, the first temperature sensor 104, and the second temperature sensor 106 in the oxygen lance water return device, and the signal processing device 70 is electrically connected to the signal isolation device 72; the communication device 74 is electrically connected to the signal processing device 70, and the communication device 74 can send an electrical signal to the controller 5 in the oxygen lance water return device; wherein, the controller 5 is electrically connected to the oxygen lance 60, and the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 respectively transmit the acquired water inlet flow rate and water outlet flow rate, and the first temperature sensor 104 and the second temperature sensor 106 respectively transmit the acquired water inlet temperature and water outlet temperature in the form of electrical signals to the signal processing device 70, which are processed by the signal isolation device 72 and sent to the controller 5 via the communication device 74. The controller 5 controls the opening or closing of the oxygen lance 60 according to the acquired water flow information and water temperature information.

[0056] like Figure 7As shown, the signal processing device 70 is specifically an on-site remote station. In order to avoid the explosion accident of the converter molten metal liquid caused by water leakage of the converter oxygen lance 60, the water pressure, water flow, inlet and outlet water temperatures of the cooling water in the oxygen lance return water control system are detected and displayed in real time. When problems occur in the cooling water data in the oxygen lance return water system, an alarm is triggered to ensure the normal operation of high-pressure converter steelmaking. Specifically, the flow rate and temperature signals are measured on site by the first electromagnetic flowmeter 10, the second electromagnetic flowmeter 102, the first temperature sensor 104, and the second temperature sensor 106, respectively, and uploaded to the on-site remote station. The flow rate and temperature signals collected once are passed through the isolation module (i.e., the signal isolation device 72) in the remote station to suppress interference with the signals caused by common grounding, the frequency converter, the solenoid valve, and unknown pulses, and are converted into pure and stable signals. The signals are transmitted to the computer (i.e., the controller 5) via the PLC communication cable (i.e., the communication device 74) in the remote station, and the computer program controls the different modes and states of the oxygen lance 60. That is, the computer controls the opening or closing of the oxygen lance 60 according to the acquired water inlet flow rate, water outlet flow rate, water inlet temperature, and water outlet temperature to achieve safe production.

[0057] It should be noted that, since the return pipe 3 is not full of medium due to the existence of siphon, negative pressure and other phenomena, most flow meters on the market currently require the medium to be full in the pipe to accurately measure the flow of pipeline media. The ultrasonic flow meters on the market can measure non-full pipe media, but due to the limited on-site environment and the high signal requirements and low accuracy of the ultrasonic flow meter, it cannot meet the flow measurement requirements of the oxygen gun 60. Electromagnetic flow meters are generally more widely used in water media, so electromagnetic flow meters are used to measure the flow of the oxygen gun 60.

[0058] In detail, since the oxygen gun 60 platform is far away from the control room, a remote station is set up nearby on site to centrally collect on-site sensor signals for centralized isolation, and finally communicate with the control room computer through a communication optical cable to achieve remote control.

[0059] Furthermore, the water inlet flow is less than or equal to 170m 3 / h, the controller 5 controls the oxygen lance 60 to be closed; or the outlet water temperature is greater than or equal to 55°C, the controller 5 controls the oxygen lance 60 to be closed; or the difference between the outlet water temperature and the inlet water temperature is greater than or equal to ≥20°C and maintained for 4 seconds, the controller 5 controls the oxygen lance 60 to be closed; or the difference between the inlet water flow rate and the outlet water flow rate is ≥10m3 / h and maintained for 4 seconds, the controller 5 controls the oxygen lance 60 to be closed.

[0060] Generally, oxygen lance 60 water flow rate is required to be >170m before blowing. 3 / h, water temperature <35℃, otherwise, blowing is not allowed; during blowing, if the outlet water temperature of oxygen lance 60 is higher than the set value of 50℃, an alarm will be displayed; if it is higher than 55℃ or the inlet and outlet water temperature difference is ≥20℃ and maintained for 4 seconds, the oxygen lance will automatically rise to the waiting point and blowing will be interrupted; similarly, if the inlet and outlet water flow difference is ≥10m3 / h and maintained for 4 seconds, blowing will be interrupted.

[0061] According to a specific embodiment of the present invention, a high-position oxygen lance return water flow measurement device is proposed, and the specific implementation method and its beneficial effects are further explained:

[0062] like Figure 5 As shown, the high-level oxygen lance return flow rate measuring device specifically includes an inlet pipe 2, a return pipe 3, a cooling pipe (i.e., a water flow device 1), an oxygen lance 60, a negative pressure relief valve 4, a first electromagnetic flowmeter 10, and a second electromagnetic flowmeter 102. The cooling pipe is arranged in the oxygen lance 60, and the inlet pipe 2 and the return pipe 3 are respectively connected to the water inlet end and the water outlet end of the cooling pipe, and the water inlet end of the cooling pipe is arranged below the water outlet end. A rising pipe 32 is arranged on the return pipe 3. The rising pipe 32 is arranged vertically and is 3 meters long. The second electromagnetic flowmeter 102 is arranged at a height of 2 meters on the rising pipe 32, so that the liquid in the cooling water pipe can be in a more full pipe state. At the same time, a negative pressure relief valve 4 (DN50 shut-off valve) is installed at the upper end of the descending pipe 34 to interlock the oxygen lance system control signal to achieve automatic control. When the oxygen lance 60 starts blowing and the cooling water starts circulating, the water in the return water pipe 3 flows downward, forcing a negative pressure to form in the return water pipe 3. At this time, the PLC (i.e., the controller 5) gives a signal to open the negative pressure relief valve 4, so that the return water pipe 3 is connected to the atmosphere through the negative pressure relief valve 4. The air in the atmosphere enters the return water pipe 3 through the negative pressure relief valve 4, solving the problem of negative pressure in the return water pipe 3 and keeping the return water pipe 3 in a positive pressure state, thereby reducing the error between the water flow measurement results of the inlet pipe 2 and the water flow measurement results of the return water pipe 3 due to the negative pressure in the return water pipe 3. When production is completed or maintenance is carried out, the PLC (i.e., the controller 5) gives a signal to close the negative pressure relief valve 4 to prevent the circulating water from overflowing, thereby ensuring the continuous production needs of the converter.

[0063] The main components of the oxygen lance return water control system are: electromagnetic flowmeter (sensor and converter integrated), signal converter (signal intermediate unit), cut-off valve (including connecting accessories), PLC system, computer, etc.

[0064] The performance parameters, signal transmission and accuracy requirements of the oxygen lance return water control system measurement equipment (electromagnetic flowmeter, negative pressure relief valve) are as follows:

[0065] (1) Measurement object: Liquid medium with conductivity ≥5μS / cm

[0066] (2) Measuring range: medium flow rate ≤ 20m / s.

[0067] (3) Measurement method: Based on the Faraday electromagnetic induction principle through dual-electrode measurement;

[0068] (4) Measurement accuracy: ≤±1%;

[0069] (5) Analog signal: active (4-20) mA, accuracy: ≤0.5%

[0070] (6) Working environment conditions: (-25~60)℃

[0071] (7) Pneumatic shut-off valve: air source (0.3-0.7) MPa, 24VDC single coil, limit switch (2 switches), the valve is fully open in the air loss state.

[0072] (8) Flow meter power supply: Voltage: (100~230)±15%V AC Frequency: 47~440Hz;

[0073] Design requirements for oxygen lance return pipe junction:

[0074] ① Pipeline structure modification must ensure that the electromagnetic flowmeter meets the straight pipe section (5D in front, 3D in the back. D: pipeline diameter) requirements.

[0075] ② The flowmeter is an electromagnetic flowmeter, and the domestic Sichuan Instrument integrated electromagnetic flowmeter is selected. It is easy to maintain and control spare parts costs.

[0076] ③ The flow meter electrode is made of 316L stainless steel, which has a greater advantage in pitting corrosion resistance than ordinary 304 material. The electrode is arranged in the center of the pipeline. When the cooling water is not full in the pipeline, an alarm output is realized to provide early warning.

[0077] ④ Neutral rubber cable should be used for flow sensor cable to ensure high strength and low loss of transmitted flow signal. Signal cable must be separated from other power supplies to avoid laying in the same pipe. It cannot be laid equally to avoid AC power interference and cause flow value fluctuation.

[0078] ⑤ Heavy-gauge threaded pipes, seamless steel pipes, and welded steel pipes that comply with GB / T14823.1 may be used for laying conduits for various cables. Special rubber cables must be installed in flameproof conduits and appropriate protective measures must be taken.

[0079] ⑥ The bottom end of the pipeline lifting section should be reinforced with anti-vibration devices. Pipeline welding should be done by manual arc welding, with all welds using butt-groove welds. The starting points of adjacent welds should be staggered by 20-30mm. Unqualified welds should not be repaired more than three times.

[0080] ⑦ Before assembling the pipeline, the groove and the inner and outer surfaces should be cleaned manually or mechanically, and oil, paint, rust, burrs, etc. within 100mm of the pipeline edge should be removed. To prevent cracks in welding, do not force the joints.

[0081] ⑧ During the pipe butt joint process, the starting points of the welds between adjacent layers should be staggered by 20 to 30 mm. Unqualified welds must be repaired no more than three times.

[0082] ⑨ The vertical deviation of the riser 32 of the rising pipeline shall not exceed 10mm. The pressure resistance level of all connecting flanges on the pipeline shall comply with PN2.5MPa. When the discharge valve is connected, the sealing gasket and weld seam shall not protrude from the pipeline.

[0083] Others: The vent valve is installed at the top of the pipeline, protective reinforcement measures are added as needed, and the power gas source is clean, dry air or nitrogen.

[0084] like Figure 6 and Figure 8 As shown, another specific embodiment of the present invention provides an oxygen lance water return control system, comprising:

[0085] An oxygen lance return water control system is proposed, including:

[0086] The oxygen lance water return device in the above embodiment; the first temperature sensor 104 is provided on the water inlet pipe 2 in the oxygen lance water return device; the second temperature sensor 106 is provided on the return pipe 3 in the oxygen lance water return device, the first temperature sensor 104 and the second temperature sensor 106 are specifically resistance rods, and the first temperature sensor 104 and the second temperature sensor 106 are used to detect the inlet water temperature of the inlet pipe 2 and the outlet water temperature of the return pipe 3, the signal processing device 70 is electrically connected to the first electromagnetic flowmeter 10, the second electromagnetic flowmeter 102, the first temperature sensor 104, and the second temperature sensor 106 in the oxygen lance water return device, and the signal processing device 70 is electrically connected to the signal isolation device 72 is electrically connected; a communication device 74 is electrically connected to the signal processing device 70, and the communication device 74 can send an electrical signal to the controller 5 in the oxygen gun water return device; wherein, the controller 5 is electrically connected to the oxygen gun 60, and the first electromagnetic flowmeter 10 and the second electromagnetic flowmeter 102 respectively transmit the obtained water inlet flow rate and water outlet flow rate, and the first temperature sensor 104 and the second temperature sensor 106 respectively transmit the obtained water inlet temperature and water outlet temperature in the form of electrical signals to the signal processing device 70, which are processed by the signal isolation device 72 and then sent to the controller 5 via the communication device 74. The controller 5 controls the opening or closing of the oxygen gun 60 according to the obtained water flow rate information and water temperature information.

[0087] It should be noted that the signal processing device 70 is specifically a field remote station. In order to avoid the converter oxygen lance, the signal isolation device 72 is a device that uses photoelectric, magnetoelectric and other isolation technologies to realize the mutual isolation and conversion of input and output signals. Its main function is to suppress the interference of common ground, frequency converter, solenoid valve and unknown pulses on the equipment, and improve the performance of the measuring equipment without breakdown when used in harsh environments. The Nanjing Youbei C series isolation module currently used in the oxygen lance cooling water control system (i.e., the oxygen lance return water control system) inputs current / voltage signals and transmits output isolated current and voltage signals, which can realize three-terminal isolation between input, output and power supply. At the same time, it has a fast response time (<0.2ms), low power consumption (single signal <0.4W), and good temperature characteristics (<30ppm / ℃).

[0088] Furthermore, the water inlet flow is less than or equal to 170m 3 / h, the controller 5 controls the oxygen lance 60 to be closed; or the outlet water temperature is greater than or equal to 55°C, the controller 5 controls the oxygen lance 60 to be closed; or the difference between the outlet water temperature and the inlet water temperature is greater than or equal to ≥20°C and maintained for 4 seconds, the controller 5 controls the oxygen lance 60 to be closed; or the difference between the inlet water flow rate and the outlet water flow rate is ≥10m3 / h and maintained for 4 seconds, the controller 5 controls the oxygen lance 60 to be closed.

[0089] The beneficial effects of the present invention are as follows:

[0090] 1. Implement the upward lifting layout transformation of the return water pipe so that the liquid in the cooling water pipe can be in a more full pipe state to meet the measurement requirements of the electromagnetic flowmeter;

[0091] 2. Moving the electromagnetic flowmeter to a vertical installation can prevent the residual bubbles and the liquid two-phase medium from generating uneven distribution or phase separation when the flow rate is low, so that the lining wear around the pressure transmitter 108 on the water inlet pipe 2 and the return pipe 3 is more uniform, thereby reducing the additional measurement error caused by this, improving the measurement accuracy, and extending the service life of the electromagnetic flowmeter.

[0092] 3. Install a negative pressure relief valve with the relief port connected to the atmosphere. This will allow the suction physical effect caused by the height difference of the cooling water in the oxygen lance to pass through the negative pressure relief valve so that negative pressure will not be formed at the cooling water inlet, thereby achieving the purpose of negative pressure relief and eliminating the siphoning and negative pressure state of the medium in the pipeline, thus avoiding damage and shedding of the flow meter lining, insulation degradation of the measuring coil, and scrapping of the electromagnetic flow meter.

[0093] 4. Adding an automatic control system for the discharge valve realizes the switching control of the production status, prevents cooling water from overflowing, ensures production continuity and improves production efficiency.

[0094] 5. In order to avoid the impact current signal generated by the AC motor of the oxygen gun lifting device, an independent signal isolation module is introduced to filter out the interference signal in the flow input signal, so that the flow feedback value is stable and accurate, providing a guarantee for production.

[0095] Benefits and summary:

[0096] (1) After the oxygen gun return water pipeline was modified and equipped with a discharge control, the "siphon" phenomenon was effectively suppressed. Before the implementation, the maximum negative pressure in the pipeline reached -62 kPa. After the implementation, the return water pressure detection pressure in the horizontal section was (3~15) kPa, which achieved the effective discharge of the negative pressure in the flow meter measurement pipeline, met the technical requirements for the normal use of the electromagnetic flow meter, and ensured the authenticity of the return water flow detection data.

[0097] (1) The positive pressure and full pipe requirements of the electromagnetic flowmeter pipeline were met, and the normal inlet and return water deviation linkage conditions of the oxygen lance were restored. By comparing the relevant parameters of the oxygen lance inlet and return water before and after implementation (see Table 1), the inlet and return water flow display and flow difference were relatively stable after the improvement, and the inlet and return water flow fluctuation trend and range were basically consistent under the blowing state. Accurate measurement of the oxygen lance inlet and return water flow was achieved, achieving good results.

[0098] Table 1 Schematic diagram of oxygen lance return water control

[0099]

[0100]

[0101] (3) Major safety hazards were eliminated, equipment costs were reduced, and the oxygen lance interlocking conditions were put into normal use, effectively reducing the risks of molten steel explosion and oxygen lance explosion, eliminating a potential source of danger in the converter oxygen lance system; eliminating the damage to equipment caused by negative pressure, extending the service life of the equipment, and saving about 100,000 yuan in spare parts costs annually.

[0102] Summary: After the improvement of the measurement scheme for the cooling water supply and return flow of the converter oxygen lance of our unit, accurate measurement can be achieved, which completely solves the difficult problem that the original oxygen lance cooling water return flow cannot be measured, provides the necessary conditions for the prediction of converter oxygen lance leakage, and eliminates a potential source of danger in the converter oxygen lance system, so that the converter can operate safely and stably. It has made an effective attempt at the method of measuring the return flow rate of the domestic top-blown converter steelmaking oxygen lance, which can be promoted in the measurement of the return flow rate of the domestic top-blown converter steelmaking oxygen lance, and has reference value for other similar measurements.

[0103] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

[0104] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0105] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0106] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An oxygen lance water return device, characterized in that: include: Oxygen lances, steelmaking furnaces, converter oxygen lance return main pipes and negative pressure balancing devices for water supply and return pipes; The negative pressure balancing device for water supply and return pipes includes: A water flow device, wherein a water flow channel is provided in the water flow device; a water inlet pipe, wherein the water outlet end of the water inlet pipe is connected to the head end of the water flow channel of the water flow device; A return water pipe, the return water pipe comprising a downward pipe extending in an up-down direction and a horizontal pipe extending in a horizontal direction, the water inlet end of the horizontal pipe being connected to the tail end of the water flow channel; a negative pressure relief valve, provided at the upper end of the descending pipe; a controller electrically connected to the negative pressure relief valve, the controller controlling the opening or closing of the negative pressure relief valve according to the acquired water flow information of the water flow device, the water inlet pipe, or the water return pipe; It also includes a first electromagnetic flowmeter and a second electromagnetic flowmeter respectively provided on the water inlet pipe and the water return pipe; When the controller obtains information about water flow in the water inlet pipe or the water return pipe, the controller controls the negative pressure relief valve to open; when the controller obtains information about water not flowing in the water inlet pipe or the water return pipe, the controller controls the negative pressure relief valve to close; When the water in the return water pipe flows downward, the downward flow of the water in the return water pipe forces a negative pressure to be formed in the return water pipe. The controller controls the negative pressure relief valve to open, so that the return water pipe is connected to the atmosphere through the negative pressure relief valve. Air in the atmosphere enters the return water pipe through the negative pressure relief valve, so that the return water pipe is maintained in a positive pressure state, thereby reducing the error between the water flow measurement result of the inlet pipe and the water flow measurement result of the return water pipe due to the negative pressure in the return water pipe; The return water pipeline further includes: a rising pipeline, and the second electromagnetic flowmeter is arranged on the rising pipeline; The horizontal pipeline specifically includes: a first horizontal branch pipe, a first end of the first horizontal branch pipe is connected to the water outlet end of the water flow channel, and a second end of the first horizontal branch pipe is connected to the lower end of the rising pipe; a second horizontal branch pipe, one end of which is connected to the upper end of the ascending pipe, and the other end of which is connected to the upper end of the descending pipe; The controller is electrically connected to the first electromagnetic flowmeter to obtain water flow information of the water inlet pipe; or the controller is electrically connected to the second electromagnetic flowmeter to obtain water flow information of the return pipe; Oxygen lance; the water flow device in the negative pressure balancing device of the water supply and return pipes is arranged in the oxygen lance, wherein the oxygen flow in the oxygen lance passes through the water flow device and is ejected from the nozzle of the oxygen lance; the water in the water flow device exchanges heat with the oxygen in the oxygen lance during the flow from the water inlet end to the water outlet end of the water flow channel; The water passing device is specifically a heat exchange pipe, and the oxygen in the oxygen lance exchanges heat with the cold water flowing through the heat exchange pipe through the heat exchange pipe; A steelmaking furnace, wherein the nozzle of the oxygen lance is in communication with the steelmaking furnace to supply oxygen into the steelmaking furnace; The converter oxygen lance return water main pipe; the lower end of the descending pipe in the water supply and return water pipeline negative pressure balancing device is connected to the converter oxygen lance return water main pipe.

2. The oxygen lance water return device according to claim 1, characterized in that: The water inlet end of the horizontal pipe is located above the water outlet end of the water inlet pipe.

3. The oxygen lance water return device according to claim 2, characterized in that: The length of the rising pipe is 3 meters, and the second electromagnetic flowmeter is arranged 2 meters above the lower end of the rising pipe.

4. An oxygen lance water return control system, characterized in that: include: The oxygen lance water return device according to any one of claims 1 to 3; A first temperature sensor is provided on the water inlet pipe of the oxygen lance water return device; A second temperature sensor is provided on the return water pipe in the oxygen lance return water device; a signal processing device electrically connected to the first electromagnetic flowmeter, the second electromagnetic flowmeter, the first temperature sensor, and the second temperature sensor in the oxygen lance water return device; a signal isolating device electrically connected to the signal processing device; a communication device electrically connected to the signal processing device, the communication device being capable of sending an electrical signal to a controller in the oxygen lance water return device; The controller is electrically connected to the oxygen gun, and the first electromagnetic flowmeter and the second electromagnetic flowmeter respectively transmit the acquired water inlet flow rate and water outlet flow rate, and the first temperature sensor and the second temperature sensor respectively transmit the acquired water inlet temperature and water outlet temperature in the form of electrical signals to the signal processing device. After being processed by the signal isolation device, the signals are sent to the controller via the communication device. The controller controls the opening or closing of the oxygen gun according to the acquired water inlet flow rate, water outlet flow rate, water inlet temperature and water outlet temperature.

5. The oxygen lance water return control system according to claim 4, characterized in that: The water inlet flow rate is less than or equal to 170m 3 / h, the controller controls the oxygen lance to be closed; Or the outlet water temperature is greater than or equal to 55°C, the controller controls the oxygen lance to be closed; Or the difference between the outlet water temperature and the inlet water temperature is greater than or equal to ≥20°C and is maintained for 4 seconds, the controller controls the oxygen lance to be closed; Or the difference between the water inlet flow rate and the water outlet flow rate is ≥10m3 / h and is maintained for 4 seconds, and the controller controls the oxygen lance to be closed.

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