A cooling device for real-time monitoring of steel pipe water mist cooling temperature and speed

Abstract

The present invention provides a cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, the cooling device comprising a cooling pipeline, the cooling pipeline being an annular pipeline; a plurality of water mist nozzles are arranged in parallel on the annular pipeline, the water mist nozzles are used to spray water mist to cool the workpiece; a water inlet pipeline is connected to the annular pipeline, an electric ball valve is arranged on the water inlet pipeline, the electric ball valve is used to control the opening degree of the water inlet pipeline, and then control the water output of the water mist nozzle to control the cooling speed of the workpiece. In the cooling device of the present invention, the opening degree of the electric ball valve is controlled by the real-time monitoring value of the infrared temperature measuring device to control the cooling rate of the workpiece; the heat-treated workpiece can be cooled at a more suitable cooling temperature, thereby ensuring that the heat-treated workpiece obtains a better crystal structure, ensuring that the heat-treated workpiece ultimately has better comprehensive mechanical properties, and achieving significant economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling devices, and in particular relates to a cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe. Background Art

[0002] Water mist cooling technology is widely used in heat treatment and controlled rolling and controlled cooling control of steel pipes. Its cooling rate is between traditional air cooling and quenching. It is mainly used in the production process of thick-walled high-pressure blast furnace tubes, non-quenched and tempered steel, etc.

[0003] However, the current method of controlling the water mist cooling temperature and cooling speed is to set the water mist cooling flow and cooling time in advance to ultimately control the cooling temperature and overall cooling speed. However, the control method of setting the flow and cooling time has the following problems:

[0004] 1. It is impossible to monitor the temperature of the workpiece in real time during the water mist cooling process. Only the initial temperature and final temperature of the workpiece before and after the water mist cooling can be tested;

[0005] 2. It is impossible to obtain the instantaneous cooling rate of the workpiece during the cooling process, and only the average cooling rate of the cooling process can be obtained;

[0006] 3. It is impossible to adjust the water mist cooling flow and cooling time in real time according to the cooling speed and cooling temperature, and it is difficult for the workpiece to achieve the ideal organization and performance.

[0007] It is also due to the existence of the above three problems that the existing method of constant flow and cooling time results in uneven workpiece structure and performance, especially the situation where the water temperature varies greatly in different seasons and the volatility of production quality have always been difficult to solve technical problems.

[0008] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0009] The object of the present invention is to provide a cooling device for real-time monitoring of the cooling temperature and speed of a steel pipe, so as to at least solve the problems of uneven workpiece structure and performance obtained by the current method of constant flow rate and cooling time.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, the cooling device comprising a cooling pipeline, the cooling pipeline being a ring pipeline;

[0012] A plurality of water mist nozzles are arranged in parallel on the annular pipeline, and the water mist nozzles are used to spray water mist to cool the workpiece;

[0013] The annular pipeline is connected with a water inlet pipeline, and an electric ball valve is arranged on the water inlet pipeline. The electric ball valve is used to control the opening degree of the water inlet pipeline, and then control the water output of the water mist nozzle to control the cooling speed of the workpiece.

[0014] The cooling device for real-time monitoring of the water mist cooling temperature and speed of the steel pipe as described above, preferably, also includes an online infrared temperature measuring device for real-time monitoring of the temperature of the workpiece, the online infrared temperature measuring device is connected to the electric ball valve signal, and the value measured by the online infrared temperature measuring device is fed back to the electric ball valve to control the opening size of the electric ball valve.

[0015] As described above, the cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, preferably, the annular pipeline is a rectangular structure, the rectangular structure includes two long sides and two short sides, and there is an arc transition between adjacent long sides and short sides;

[0016] A plurality of water mist nozzles are arranged in parallel on the two long sides.

[0017] As described above, the cooling device for real-time monitoring of the temperature and speed of water mist cooling of a steel pipe is preferably connected to water inlet pipelines on both of the two short sides.

[0018] As described above, for the cooling device for real-time monitoring of the temperature and speed of water mist cooling of a steel pipe, preferably, a flow meter is also connected downstream of the electric ball valve on the water inlet pipeline.

[0019] As described above, in the cooling device for real-time monitoring of the temperature and speed of water mist cooling of a steel pipe, preferably, the online infrared temperature measuring device is a dual-wavelength online temperature measuring instrument.

[0020] As described above, in the cooling device for real-time monitoring of the temperature and speed of water mist cooling of a steel pipe, preferably, a central pipeline is connected to the middle of the two short sides, and the central pipeline is a bendable hose.

[0021] As described above, in the cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, preferably, a plurality of water mist nozzles are arranged in parallel on the central pipeline.

[0022] As described above, the cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe is preferably provided with a disassembled sealing connection between the central pipeline and the short side of the annular pipeline.

[0023] As described above, the cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe is preferably connected to a first joint at the end of the central pipe, a branch pipe is connected to the center of the short side, and a second joint is connected to the end of the branch pipe away from the short side;

[0024] The first joint is butt-connected with the second joint, and a butt sleeve is connected to the outer circumferential surfaces of the first joint and the second joint, and the butt sleeve is threadedly connected to the first joint and the second joint.

[0025] Beneficial effect: In the cooling device of the present invention, the opening degree of the electric ball valve is controlled by the real-time monitoring value of the infrared temperature measuring equipment to control the cooling rate of the workpiece; the heat-treated workpiece can be cooled at a more suitable cooling temperature, thereby ensuring that the heat-treated workpiece obtains a better crystal structure, ensuring that the heat-treated workpiece ultimately has better comprehensive mechanical properties, and achieving significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cooling device for real-time monitoring of the cooling temperature and speed of the steel pipe in the embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the structure of the central pipe joint in an embodiment of the present invention.

[0028] In the figure: 1. Electric ball valve; 2. Flow meter; 3. Ring pipeline; 4. Water mist nozzle; 5. Center pipeline; 6. Heat treatment workpiece; 7. Dual-wavelength online temperature meter; 8. Second joint; 9. First joint; 10. Butt sleeve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0030] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0032] According to a specific embodiment of the present invention, Figure 1-2 As shown, the present invention provides a cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, the cooling device comprises a cooling pipeline, the cooling pipeline is an annular pipeline 3; a plurality of water mist nozzles 4 are arranged in parallel on the annular pipeline 3, the water mist nozzles 4 are used to spray water mist to cool the workpiece; the annular pipeline 3 is connected to a water inlet pipeline, an electric ball valve 1 is arranged on the water inlet pipeline, the electric ball valve 1 is used to control the opening degree of the water inlet pipeline, and then control the water output of the water mist nozzle 4 to control the cooling speed of the workpiece.

[0033] The cooling device also includes an online infrared temperature measuring device, which is connected to the electric ball valve 1 by signal. The online infrared temperature measuring device and the electric ball valve 1 are both connected to the data processing system through a signal connection line. In this embodiment, the data processing system can be a computer, a PLC controller or other devices.

[0034] The online infrared temperature measuring device feeds back the measured value to the mathematical processing system, and the data processing system adjusts the opening size of the electric ball valve 1 according to the temperature of the heat-treated workpiece 6, thereby controlling the cooling speed of the heat-treated workpiece 6, so that the heat-treated workpiece 6 can be cooled at a more suitable cooling temperature, thereby ensuring that the heat-treated workpiece 6 obtains a better crystal structure and ensures that the heat-treated workpiece 6 ultimately has better comprehensive mechanical properties. In this embodiment, the heat-treated workpiece 6 is a steel pipe.

[0035] The annular pipeline 3 is a rectangular structure, which includes two long sides and two short sides, and has an arc transition between adjacent long sides and short sides; a plurality of water mist nozzles 4 are arranged in parallel on the two long sides. In the present application, the water mist nozzles 4 are arranged on the two long sides to cool the outer surface of the heat-treated workpiece 6.

[0036] The two short sides are connected with water inlet pipelines. A flow meter 2 is also connected downstream of the electric ball valve 1 on the water inlet pipeline.

[0037] The online infrared temperature measuring device is a dual-wavelength online thermometer 7. The dual-wavelength online thermometer 7 can penetrate the interference of steam and water mist, avoid the influence of surface oxide skin on the actual temperature test, accurately test the temperature of the steel pipe during the water mist process, and calculate the cooling rate.

[0038] The middle of the two short sides is connected with a central pipeline 5, which is a bendable hose. The hose is convenient to bend and extend into the interior of the heat-treated workpiece 6 to cool the interior of the heat-treated workpiece 6.

[0039] A plurality of water mist nozzles 4 are arranged in parallel on the central pipeline 5 .

[0040] The central pipeline 5 is connected to the short side of the annular pipeline 3 in a disassembly and sealing manner. The end of the central pipeline 5 is connected to a first joint 9, the center of the short side is connected to a branch pipe, and the end of the branch pipe away from the short side is connected to a second joint 8;

[0041] The first joint 9 is butt-connected with the second joint 8 . A butt-joint sleeve 10 is connected to the outer circumferential surfaces of the first joint 9 and the second joint 8 . The butt-joint sleeve 10 is threadedly connected to the first joint 9 and the second joint 8 .

[0042] In this embodiment, the outside of the first joint 9 has a step structure, and the inside of the second joint 8 has a step joint. The boss of the first joint 9 can be inserted into the recessed platform of the second joint 8 to achieve plug-in connection; and a threaded structure is provided on the outer peripheral surface after the first joint 9 and the second joint 8 are docked. After the two are docked, the docking sleeve 10 is threadedly connected to the outside of the first joint 9 and the second joint 8 to achieve a fixed connection between the two.

[0043] When using the above device, after the heating is completed, the heat-treated workpiece 6 is placed in the center of the annular pipeline 3, and a rotating tug is provided below the cooling device, and the heat-treated workpiece 6 is placed on the rotating tug, and the heat-treated workpiece 6 is driven by the rotating tug to realize self-rotation. When placing the heat-treated workpiece 6, first disassemble the first joint 9 and the second joint 8, and when the heat-treated workpiece 6 is placed in place, pass the central pipeline 5 through the center of the heat-treated workpiece 6, and then plug and match the first joint 9 and the second joint 8, and thread the docking sleeve 10 to the periphery of the first joint 9 and the second joint 8, so as to realize the connection between the central pipeline 5 and the annular pipeline 3. Then, a cooling medium is introduced into the cooling device. In this embodiment, the cooling medium can be water or other coolants. When the heat-treated workpiece 6 is cooled, the dual-wavelength online temperature meter 7 monitors the temperature of the heat-treated workpiece 6 in real time and transmits the monitoring data to the data processing system. The data processing system sends a signal to the electric ball valve 1 according to the set cooling rate of the workpiece to control the opening degree of the electric ball valve 1, thereby controlling the cooling rate and cooling time of the heat-treated workpiece 6, so that the heat-treated workpiece 6 can obtain a better cooling crystal structure.

[0044] In this embodiment, by programming software in the data processing system, the cooling speed is involved in the opening control of the electric ball valve 1, and the cooling temperature is involved in the water mist time control, thereby realizing the process of real-time monitoring of the water mist cooling temperature and speed.

[0045] According to different varieties and specifications, the initial temperature Tc (1050-650℃), final temperature Tz (850-250℃), and cooling speed V (20-0.2℃ / s) of water mist cooling are set (it can also be divided into different sections according to process requirements, i.e. Tc2, Tz2, V2...). After the heat-treated workpiece 6 is sent into the cooling device, the cooling time of the electric ball valve 1 (i.e. water mist flow) is dynamically controlled according to the set process parameter conditions and the real-time monitored cooling temperature and the calculated cooling speed.

[0046] Example 1

[0047] The cooling device is applied to the normalizing cooling process of 15CrMoG, where the outer diameter of the steel pipe is 335mm and the wall thickness is 68mm. The process parameters are set as shown in Table 1.

[0048] Table 1 Process parameters of the cooling device of the present invention applied to the normalizing cooling process of 15CrMoG

[0049] project Tc1℃ Tz1℃ V1℃ / s parameter 910 450 2.5

[0050] The function is realized as follows: after fully austenitizing the 930-950℃ steel pipe, it is transmitted to the cooling device. When it is detected that the lowest temperature of the workpiece is lower than 910℃ for 30 seconds in a row, the water mist is turned on normally, and the online infrared temperature measuring equipment monitors the workpiece temperature in real time and calculates the cooling speed, and adjusts the opening degree of the electric ball valve 1 according to the cooling speed to control the flow of the cooling medium. When the lowest temperature of the workpiece is lower than 450℃ for 30 seconds in a row, the cooling is stopped, and the workpiece proceeds to the next process normally.

[0051] Example 2

[0052] The cooling device is applied to the normalizing cooling process of 12Cr1MoVG, where the outer diameter of the steel pipe is 467mm and the wall thickness is 80mm. The process parameters are set as shown in Table 2.

[0053] Table 2 Process parameters of the cooling device of the present invention applied to the normalizing cooling process of 12Cr1MoVG

[0054] project Tc1℃ Tz1℃ V1℃ / s Tc2℃ Tz2℃ V2℃ / s parameter 800 680 2.5 680 350 1.5

[0055] The function is realized as follows: after fully austenitizing the 990-1000℃ steel pipe, it is transmitted to the cooling device. When it is detected that the lowest temperature of the workpiece is lower than 800℃ for 30 seconds in a row, the water mist is turned on normally, the infrared temperature measures the real-time workpiece temperature and calculates the cooling rate, and the opening degree of the electric ball valve 1 is adjusted according to the cooling rate of 1.5℃ / s; when the lowest temperature of the workpiece is lower than 680℃ for 30 seconds in a row, the second cooling process begins, and the opening degree of the electric ball valve 1 is adjusted according to the cooling rate of 2.5℃ / s; when the lowest temperature of the workpiece is lower than 350℃ for 30 seconds in a row, the cooling is stopped, and the workpiece goes through the next process normally.

[0056] Comparative Example

[0057] The three kinds of steel pipes, 15CrMoG, 12Cr1MoVG and P92, were compared respectively by the present invention and the conventional method of controlling the cooling effect by setting the flow rate and cooling time, and the organization and performance of 30 batches were statistically analyzed as shown in Table 3.

[0058] Table 3 Performance comparison of different steel grades using the cooling method of the present invention and the traditional cooling method

[0059]

[0060] It can be seen from Table 3 that the performance and grain size stability of the products produced by the cooling device of the present invention are significantly better than those of the traditional water mist cooling method which controls cooling by setting flow rate and cooling time.

[0061] The cooling device and the use method of the present invention are successfully applied to the water mist cooling control process of a heat treatment production line, realizing real-time monitoring of the cooling temperature and cooling speed of the heat treatment workpiece, ultimately obtaining ideal performance and structure, and achieving significant economic benefits.

[0062] Based on the calculation of producing 10,000 tons of heat-treated materials by water mist cooling, the present invention can increase the first-inspection pass rate from 97.55% to above 98.85%, while the re-heat treatment cost of one ton of material is 406 yuan, and the cumulative cost reduction per 10,000 tons of material is 10,000×406×(98.85%-97.55%)=52,780 yuan.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A cooling device for real-time monitoring of the water mist cooling temperature and speed of a steel pipe, characterized in that: The cooling device comprises a cooling pipeline, and the cooling pipeline is a ring pipeline; A plurality of water mist nozzles are arranged in parallel on the annular pipeline, and the water mist nozzles are used to spray water mist to cool the workpiece; The annular pipeline is connected to a water inlet pipeline, and an electric ball valve is arranged on the water inlet pipeline. The electric ball valve is used to control the opening degree of the water inlet pipeline, and then control the water output of the water mist nozzle to control the cooling speed of the workpiece; The annular pipeline is a rectangular structure, which includes two long sides and two short sides, and has an arc transition between adjacent long sides and short sides; A plurality of water mist nozzles are arranged in parallel on the two long sides; The middle parts of the two short sides are connected with a central pipeline, and the central pipeline is a bendable hose; The central pipeline is connected to the short side of the annular pipeline in a disassembly and sealing manner; the end of the central pipeline is connected to a first joint, the center of the short side is connected to a branch pipe, and the end of the branch pipe away from the short side is connected to a second joint; The first joint is butt-connected with the second joint, and a butt sleeve is connected to the outer circumference of the first joint and the second joint, and the butt sleeve is threadedly connected to the first joint and the second joint; When placing the workpiece, the first joint and the second joint are first disassembled. When the workpiece is placed in place, the central pipeline is passed through the center of the workpiece, and then the first joint and the second joint are butt-connected, and the butt sleeve is threadedly connected to the first joint and the second joint, so as to finally realize the connection between the central pipeline and the annular pipeline; The cooling device also includes an online infrared temperature measuring device for real-time monitoring of the temperature of the workpiece. The online infrared temperature measuring device is connected to the electric ball valve signal, and the value measured by the online infrared temperature measuring device is fed back to the electric ball valve to control the opening size of the electric ball valve.

2. The cooling device for real-time monitoring of steel pipe water mist cooling temperature and speed according to claim 1 is characterized in that: The two short sides are both connected with water inlet pipelines.

3. The cooling device for real-time monitoring of steel pipe water mist cooling temperature and speed according to claim 2 is characterized in that: A flow meter is also connected downstream of the electric ball valve on the water inlet pipeline.

4. The cooling device for real-time monitoring of steel pipe water mist cooling temperature and speed according to claim 1, characterized in that: The online infrared temperature measuring device is a dual-wavelength online temperature measuring instrument.

5. The cooling device for real-time monitoring of steel pipe water mist cooling temperature and speed according to claim 1, characterized in that: A plurality of water mist nozzles are arranged in parallel on the central pipeline.

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