Online maintenance method for dip pipe

Abstract

According to the online maintenance method for the dip pipe, at least two gun heads are arranged on the same side, in the circumferential direction of a gun barrel, of an outer gunning gun of a gunning machine at intervals, and at least two gun heads are arranged on the same side, in the circumferential direction of the gun barrel, of an inner gunning gun at intervals; the outer gunning gun and the inner gunning gun carry out first gunning on the two dip pipes below the vacuum tank at the same time; the position of the outer gunning gun and the position of the inner gunning gun are changed, and secondary gunning is conducted on the two dip pipes at the same time again; the top gun extends into the vacuum tank from the upper part, the top gun is gradually reduced according to the gun position height, the baking flow of the highest gun position in other gun positions except the lowest gun position is relatively minimum, the baking flow of the lowest gun position is minimum in the baking flow of all the gun positions, and the baking time of the lowest gun position is maximum in all the gun positions; and baking the dip pipe. According to the invention, dehydration of the gunning material can be rapidly carried out, the gunning material is bonded with a refractory material of the dip pipe, the anti-scouring property of the dip pipe is improved, and the service life of the vacuum tank is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furnace repair, in particular to an online maintenance method for a dip tube. BACKGROUND

[0002] The double spray gun structure RH refining furnace dip tube spraying machine is a device that can perform hot-state spraying of refractory material on the RH refining furnace dip tube, RH is the abbreviation of the company name, which represents the vacuum treatment technology of molten steel vacuum degassing, and the spraying machine uses the spraying gun to mix water, compressed air and spraying material to form a high-speed flow jet on the inner and outer walls of the dip tube to maintain the normal use of the dip tube.

[0003] However, as the production efficiency of the RH refining production line continues to improve, the spraying time of the dip tube is becoming less and less, and the baking and dehydration time of the sprayed dip tube is also becoming less, which greatly affects the repair of the dip tube and reduces the maintenance effect of the dip tube, causing a great impact on the normal use of the dip tube and the vacuum tank. SUMMARY

[0004] To solve the above problems, the present application provides an online maintenance method for a dip tube.

[0005] The present application provides an online maintenance method for a dip tube, comprising: under the condition that at least two gun heads are arranged on the same side of the outer spraying gun of the spraying machine and at least two gun heads are arranged on the same side of the inner spraying gun, the outer spraying gun and the inner spraying gun simultaneously perform first spraying on two dip tubes under the vacuum tank; after the first spraying is completed, the outer spraying gun and the inner spraying gun are exchanged, and second spraying is performed on the two dip tubes simultaneously; after the second spraying is completed, the top gun is inserted into the vacuum tank from above, and the top gun is gradually lowered according to the gun height, the baking flow of the highest gun position among the gun positions other than the lowest gun position is relatively small, the baking flow of the lowest gun position is the smallest among the baking flows of all gun positions, and the baking time of the lowest gun position is the longest among the baking times of all gun positions, so as to bake the dip tube; wherein the blowing pressure in the first spraying and the second spraying is matched with the number of gun heads of the outer spraying gun and the inner spraying gun.

[0006] In some embodiments, during the baking of the dip tube by the top gun, when the gun height is the second lowest, the baking flow is gradually increased.

[0007] In some embodiments, the baking flow of the top gun at other gun height positions except the lowest and the second lowest is equal to the minimum baking flow of the top gun when the gun height is the second lowest.

[0008] In some embodiments, the gun height of the top gun is the distance between the head of the top gun and the bottom of the vacuum tank, and the process of baking the dip tube by the top gun sequentially performs the following steps:

[0009] The gun height is 8 meters, the baking flow is 300 NL / min, and the baking time is 2 min;

[0010] The gun height is 7 meters, the baking flow is 300 NL / min, and the baking time is 2 min;

[0011] The gun height is 6 meters, the baking flow is 300 NL / min, and the baking time is 2 min;

[0012] The gun height is 6 meters, the baking flow is 400 NL / min, and the baking time is 2 min;

[0013] The gun height is 6 meters, the baking flow is 500 NL / min, and the baking time is 2 min;

[0014] The gun height is 5.6 meters, the baking flow is 300 NL / min, and the baking time is 10 min.

[0015] In some embodiments, in the first spraying and the second spraying, the blowing air pressure is the maximum pressure of the pressure air provided by the air supply pipeline connected to the spraying machine.

[0016] In some embodiments, all the heads of the outer spraying gun are relatively parallel, and the angle between the discharging direction of the head of the outer spraying gun and the feeding direction of the gun rod of the outer spraying gun is an acute angle.

[0017] In some embodiments, the angle between the discharging direction of all the heads of the inner spraying gun and the feeding direction of the gun rod of the inner spraying gun is the same acute angle value.

[0018] In some embodiments, the gun rod of the outer spraying gun and the gun rod of the inner spraying gun each comprises:

[0019] The main pipe is connected with the head;

[0020] The water jacket is fixedly sleeved on the main pipe, the pipe body of the main pipe is provided with a plurality of water inlet holes which are sequentially and circumferentially spaced, and the water inlet holes are communicated with the water jacket and the main pipe;

[0021] The air pipe is communicated at one end with one end of the main pipe, and at the other end is used for connecting the air supply connector of the spraying machine, and in the feeding direction of the main pipe, the air pipe is arranged before the water jacket;

[0022] The material pipe is communicated at one end with the pipe body of the air pipe, and at the other end is used for connecting the material supply connector of the spraying machine; and

[0023] The water pipe is communicated at one end with the water jacket, and at the other end is used for connecting the water supply connector of the spraying machine.

[0024] In some embodiments, the plurality of water inlet holes are evenly spaced along the circumference of the pipe body of the main pipe.

[0025] In some embodiments, the ratio of the water outlet amount of the water supply joint to the material outlet amount of the material supply joint is in the range of 1:0.8-1:1 when the first gunning and the second gunning are performed.

[0026] The application has the following advantages:

[0027] The application provides an online maintenance method for immersion pipes. First, the gunning gun of the gunning machine is innovatively designed. The head of the outer gunning gun is designed as at least two, and the at least two heads of the outer gunning gun are spaced on the same side of the circumference of the gun barrel. The head of the inner gunning gun is designed as at least two, and the at least two heads of the inner gunning gun are spaced along the same circumference of the gun barrel. The two immersion pipes below the vacuum tank are simultaneously gunned by the outer gunning gun and the inner gunning gun for the first time. After the first gunning is completed, the outer gunning gun and the inner gunning gun are exchanged, and the two immersion pipes are simultaneously gunned for the second time.

[0028] The gunning machine makes the outer gunning gun rotate around the immersion pipe and gradually move upward. The gunning machine makes the inner gunning gun rotate in the immersion pipe and gradually move upward. The blowing air pressure in the first gunning and the second gunning is matched with the number of heads of the outer gunning gun and the inner gunning gun. By increasing the blowing air pressure and increasing the number of heads of the outer gunning gun, the effective gunning area of the outer gunning gun in the height direction is increased, so that the number of gun raising of the outer gunning gun is relatively reduced, and the gunning operation on the outer wall of the immersion pipe is completed. By increasing the blowing air pressure and increasing the number of heads of the inner gunning gun, the inner gunning gun can run at a greater gun raising speed. Through the automatic rotation of the inner gun, the gunning material can be uniformly sprayed on the inner wall of the immersion pipe. The gunning material is uniformly sprayed on the inner and outer walls of the immersion pipe, and the gunning efficiency is greatly improved. The gunning time is greatly reduced, and the gunning time is saved by more than 1 / 3. Efficient gunning can be completed.

[0029] The application is different from the general operation mode. In the application, the top gun is gradually lowered according to the gun height, and the top gun is gradually moved from the high position to the low position. After the preset time of baking at the higher position is completed, the next baking operation is performed at the lower position. In the baking process, the baking flow of the highest gun position among the other gun positions except the lowest gun position is relatively minimum, the baking flow of the lowest gun position is minimum among the baking flows of all gun positions, and the baking time of the lowest gun position is maximum among the baking times of all gun positions. This shows that the application of high gun position and small flow in the early baking stage can gradually warm the inner wall of the immersion tube, so that the internal water vapor of the gunning material can be fully discharged. Then, by gradually lowering the gun position, the distance between the flame and the baking position is reduced, so that the gunning material on the inner wall of the immersion tube is bonded and hardened. Finally, the flame at the lowest gun position is softened, and the flame flows along the outer wall of the immersion tube upward to bake the outer wall of the immersion tube.

[0030] On the basis of improving the gunning efficiency, the dehydration of the gunning material can be quickly performed by the baking mode of the top gun, so that the gunning material is bonded with the immersion tube refractory material, the erosion resistance of the immersion tube is improved, and the service life of the vacuum tank is effectively improved. The application is suitable for the RH refining production line with improved production efficiency, and can complete the online rapid repair work of the immersion tube. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application.

[0032] Figure 1 A structure diagram of an outer gun involved in the online maintenance method for the immersion tube provided by the application;

[0033] Figure 2 A structure diagram of an inner gun involved in the online maintenance method for the immersion tube provided by the application;

[0034] Figure 3 A schematic diagram of a gunning process of the online maintenance method for the immersion tube provided by the application.

[0035] FIG. 10 is a structure diagram of an outer gun, FIG. 11 is a structure diagram of an inner gun, and FIG. 12 is a schematic diagram of a gunning process. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0037] In addition, the reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0038] The present application discloses an online maintenance method for a dip tube, which is based on a gunning machine to spray the dip tube below a vacuum tank.

[0039] Firstly, a brief introduction to the gunning machine, the double gun structure RH refining furnace dip tube gunning machine is a prominent effect of the gunning machine, which is composed of a gun position changing and rotating device, an outer gun rotating device, an outer gun self-rotating device, an inner gun self-rotating device, an auxiliary system and a walking trolley. When gunning, first move the ladle away from below the vacuum tank, and move the gunning machine to the repair position, which is below the vacuum tank. The lower side of the vacuum tank is connected with two dip tubes, which are also called ascending pipe and descending pipe respectively according to the direction of the molten steel during RH refining. The outer gun and the inner gun spray the two dip tubes respectively, then the gun position changing and rotating device moves the outer gun and the inner gun, and continues to spray the two dip tubes respectively, so that the inner and outer walls of the two dip tubes are finally sprayed with repair material.

[0040] Generally, water, compressed air and gunning material are mixed to form a high-speed flow which is sprayed on the inner and outer walls of the dip tube by the gunning gun to maintain the normal use of the dip tube. During gunning, the outer gun rotates around the dip tube, and the inner gun extends into the dip tube and rotates. The gun head of the outer gun and the inner gun is designed as a single gun head, and the gun head transversely gunning height is about 100 mm.

[0041] The present application discloses an online maintenance method for a dip tube, which first innovatively designs the gunning gun of the gunning machine. It should be noted that in order to distinguish the gun heads of the outer gunning gun and the inner gunning gun from the name, the gun head of the outer gunning gun is named as the first gun head, and the gun head of the inner gunning gun is named as the second gun head.

[0042] Please refer to Figure 1The gun head of the outer gun 10 is designed as at least two, the first gun head 11 is at least two, all the first gun heads 11 are arranged on the same side of the circumference of the gun rod, and all the first gun heads 11 are arranged in sequence in the length direction of the gun rod of the outer gun 10, so that the discharge uniformity of the outer gun 10 is good.

[0043] Please refer to Figure 2 The gun head of the inner gun 20 is designed as at least two, the second gun head 21 is at least two, and the at least two gun heads of the inner gun 20 are arranged on the same circumference of the gun rod. The "same circumference" here means that the relative positions of all the second gun heads 21 in the length direction of the gun rod of the inner gun 20 are the same, so that the discharge uniformity of the inner gun 20 is good.

[0044] The present application discloses an online maintenance method for the dip tube 50, which is applied to the gunning machine, and the gunning machine needs to meet the conditions that the outer gun 10 of the gunning machine is provided with at least two first gun heads 11 on the same side of the circumference of the gun rod, and the inner gun 20 is provided with at least two second gun heads 21 on the same circumference of the gun rod. After meeting the conditions, the online maintenance method for the dip tube 50 mainly includes a gunning operation and a baking operation, and the gunning operation mainly includes a first gunning work and a second gunning work.

[0045] The first gunning work refers to moving the gunning machine to a repair position below the vacuum tank 40, and connecting the gunning machine with the corresponding joint, which includes a water supply joint, a material supply joint and a gas supply joint. Please refer to Figure 3 The outer gun 10 is aligned with one side of the dip tube 50, and the inner gun 20 is inserted into the other dip tube 50, and the two dip tubes 50 are sprayed at the same time, and the two dip tubes 50 below the vacuum tank 40 are sprayed by the outer gun 10 and the inner gun 20 at the same time.

[0046] The second gunning work refers to the position of the outer gun 10 and the inner gun 20 is changed after the first gunning work is completed, which can also be referred to Figure 3 The outer gun 10 is aligned with the dip tube 50 whose inner wall has been sprayed in the first gunning work, and the inner gun 20 is inserted into the dip tube 50 whose outer wall has been sprayed in the first gunning work, and the two dip tubes 50 are sprayed at the same time again.

[0047] In the first gunning work and the second gunning work of the present application, the blowing pressure in the first gunning and the second gunning is matched with the number of gun heads of the outer gun 10 and the inner gun 20, and the matching means that the blowing pressure is designed according to the number of gun heads. When the number of gun heads is large, the required blowing pressure is large, of course, there are other factors that affect the size of the blowing pressure.

[0048] After the second gunning is completed, the baking operation is performed, and the baking operation mainly includes the following steps: the top gun is extended into the vacuum tank 40 from the top, and the impregnated pipe 50 with gunned inner and outer walls is baked by using the combustion mode of gas and oxygen. The online maintenance method for the impregnated pipe 50 provided in the application mainly adopts the following points in the baking operation: the top gun is gradually lowered according to the gun position height; the baking flow of the highest gun position among the other gun positions except the lowest gun position is relatively minimum; the baking flow of the lowest gun position is minimum among the baking flows of all the gun positions; and the baking time of the lowest gun position is maximum among the baking times of all the gun positions. The baking operation of the impregnated pipe 50 includes but is not limited to the four conditions.

[0049] The following is a specific explanation of the role of the above design.

[0050] The gunning machine makes the outer gunning gun 10 rotate around the impregnated pipe 50 and gradually move upwards. The outer gunning gun 10 rotating around the impregnated pipe 50 can spray the whole circumferential surface of the impregnated pipe 50. Since the impregnated pipe 50 is long and the gunning effective area of the outer gunning gun 10 is small in height, the outer gunning gun 10 cannot complete the spraying of the whole length of the impregnated pipe 50 at one height position. Therefore, the gunning machine makes the outer gunning gun 10 at different height positions, and the overall effect is to complete the spraying of the whole length of the impregnated pipe 50. Therefore, the outer gunning gun 10 needs to move upwards gradually. The gradual meaning is that after the outer gunning gun 10 completes the gunning of the gunning area corresponding to the current height, the outer gunning gun 10 is moved to another height, and the spraying of the impregnated pipe 50 is continued.

[0051] Similar to the gradual upward movement of the outer gunning gun 10 by the gunning machine, the inner gunning gun 20 also moves gradually upwards by the gunning machine. The difference is that the gunning machine makes the inner gunning gun 20 extend into the impregnated pipe 50 to rotate, and the whole circumferential surface of the inner wall of the impregnated pipe 50 is sprayed as the impregnated pipe 50 rotates.

[0052] The blowing air pressure in the first and second sprayings is matched with the number of heads of the outer spraying gun 10 and the inner spraying gun 20. In detail, the blowing air pressure is increased in cooperation with the increase of the number of heads of the outer spraying gun 10. The increase of the blowing air pressure refers to the increase of the pressure of the pressure air provided by the air supply joint to the rod of the outer spraying gun 10. The pressure air is generally pressure air, which is the abbreviation of compressed air. The original outer spraying gun 10 has only one head. The outer spraying gun 10 in the present application is provided with at least two first heads 11 at the same side of the circumference of the rod. The blowing air pressure is increased, so that the outer spraying gun 10 can complete the effective spraying of the dip pipe 50 even if the number of heads is increased and the discharge pressure of each head is reduced. Since the at least two first heads 11 are provided at the same side of the circumference of the rod of the outer spraying gun 10, the effective spraying area of the outer spraying gun 10 in the height direction is increased, so that the lifting frequency of the outer spraying gun 10 is relatively reduced. In the case of reducing the lifting frequency of the outer spraying gun 10, the spraying operation on the outer wall of the dip pipe 50 is completed.

[0053] Similar to the relationship between the number of heads of the outer spraying gun 10 and the increase of the blowing air pressure, the increase of the blowing air pressure is cooperated with the increase of the number of heads of the inner spraying gun 20, so that the inner spraying gun 20 can run at a greater lifting speed. Through the automatic rotation of the inner spraying gun, the spraying material can be uniformly sprayed on the inner wall of the dip pipe 50.

[0054] The spraying material is uniformly sprayed on the inner and outer walls of the dip pipe 50, which greatly improves the spraying efficiency and greatly reduces the spraying time of the dip pipe 50. The spraying time is saved by more than 1 / 3, and high-efficiency spraying can be completed.

[0055] After the second gunning is completed, the gunning material is uniformly sprayed on the inner and outer walls of the two immersion pipes 50 below the vacuum tank 40, and then the top gun baking operation is performed. Unlike the general top gun baking operation mode, in the present application, the top gun is gradually lowered according to the gun height, and the top gun is gradually moved from the high position to the low position. After the preset time of baking at the higher position is completed, it is moved to the lower position for the next baking operation. In the baking process, the baking flow of the highest gun position among the other gun positions except the lowest gun position is relatively the smallest, the baking flow of the lowest gun position is the smallest among all gun positions, and the baking time of the lowest gun position is the longest among all gun positions. This shows that in the early stage of baking, the gunning material inside the immersion pipe 50 is gradually heated by using a high gun position and a small flow, so that the internal water vapor of the gunning material can be fully discharged. Then, by gradually lowering the gun position, the distance between the flame and the baking position is reduced, so that the gunning material on the inner wall of the immersion pipe 50 is bonded and hardened. Finally, baking at the lowest gun position can soften the flame at the lower part of the immersion pipe 50, and the flame flows upward along the outer wall of the immersion pipe 50 to bake the outer wall of the immersion pipe 50.

[0056] On the basis of improving the gunning efficiency, in combination with the above-mentioned top gun baking mode, the dehydration of the gunning material can be quickly performed, the gunning material is bonded with the immersion pipe 50 refractory, the erosion resistance of the immersion pipe 50 is improved, and the service life of the vacuum tank 40 is effectively improved. The present application is suitable for RH refining production line with increasingly improved production efficiency, and can complete online rapid repair work of the immersion pipe 50.

[0057] In some embodiments, during the baking of the top gun on the immersion pipe 50, the baking flow gradually increases when the gun height is the second low. For example, when the gun height is 6 meters, it belongs to the case that the gun height of the top gun is the second low. When the top gun is lowered to a gun height of 6 meters, the baking flow is first 300 NL / min and the baking time is 2 min, then the baking flow is 400 NL / min and the baking time is 2 min, and then the baking flow is 500 NL / min and the baking time is 2 min. When the gun height of the top gun is the second low, the bonding and hardening effect of the gunning material on the inner wall of the immersion pipe 50 is increased with the gradual increase of the baking flow.

[0058] In some embodiments, the baking flow rate of the top gun at other gun height except the lowest and the second lowest is equal to the lowest baking flow rate of the top gun at the second lowest gun height. For example, the top gun height in the baking process is 8 meters, 7 meters, 6 meters and 5.6 meters in turn, the baking flow rate at the top gun height of 8 meters and 7 meters is 300 NL / min, and the baking flow rate at the top gun height of 6 meters in the initial stage is also 300 NL / min. With such a design, the number and degree of variation of the baking flow rate of the top gun in the baking process are reduced, the control steps of the baking process are simplified, the actual operation is facilitated, and the technical design stage is also simplified.

[0059] Based on the above features, the present application discloses a specific process of baking the dip tube 50 by the top gun, which sequentially performs the following steps: the gun height is 8 meters, the baking flow rate is 300 NL / min, and the baking time is 2 min; the gun height is 7 meters, the baking flow rate is 300 NL / min, and the baking time is 2 min; the gun height is 6 meters, the baking flow rate is 300 NL / min, and the baking time is 2 min; the gun height is 6 meters, the baking flow rate is 400 NL / min, and the baking time is 2 min; the gun height is 6 meters, the baking flow rate is 500 NL / min, and the baking time is 2 min; the gun height is 5.6 meters, the baking flow rate is 300 NL / min, and the baking time is 10 min.

[0060] The above data also shows that the baking time of the top gun at the lowest gun height is much longer than that at other gun heights, because the top gun at the lowest gun height is used for baking the outside of the dip tube 50, and it also uses the relatively smallest baking flow rate to soften the flame at the lower part of the dip tube 50, and the flame flows upwards along the outer wall of the dip tube 50 to bake the outer wall of the dip tube 50.

[0061] As mentioned above, when the blowing air pressure in the first and second spraying is matched with the number of gun heads of the outer spraying gun 10 and the inner spraying gun 20, there are other factors that affect the blowing air pressure besides the layout of the gun heads on the gun rod. In some embodiments, the blowing air pressure in the first and second spraying is defined by the air conveying pipeline connected to the spraying machine. The pressure air provided by the spraying machine to the outer spraying gun 10 and the inner spraying gun 20 is not generated by the spraying machine itself, but by the pipeline that delivers the pressure air to the spraying machine and then to the corresponding spraying gun. In actual application, only the structure of the outer spraying gun 10 and the inner spraying gun 20 of the spraying machine is changed, most of the structure of the spraying machine remains unchanged, and the air source connected to the spraying machine maintains unchanged. The pressure of the pressure air provided by the air source is limited and may not reach the ideal design value, so the blowing air pressure is defined as the maximum pressure of the pressure air provided by the air conveying pipeline connected to the spraying machine.

[0062] For example, in actual production, the blowing air pressure of the original single gun head implementation is 0.3 MPa, and after the application of the scheme of the present application, the blowing air pressure is adjusted to 0.4 MPa, which is the maximum pressure of the pressure air that the air conveying pipeline connected with the gunning machine can provide.

[0063] In some embodiments, at least two first gun heads 11 are arranged at the same side of the outer gun 10 in the circumferential direction of the gun barrel, and please refer to Figure 1 All the first gun heads 11 of the outer gun 10 are relatively parallel, so that the distribution of the mixed material sprayed by different first gun heads 11 is basically consistent, which is beneficial to ensure the uniformity of the gunning of the immersed pipe 50. And please refer to Figure 1 The angle between the discharging direction of the first gun head 11 of the outer gun 10 and the feeding direction of the gun barrel of the outer gun 10 is an acute angle, for example, as shown in the figure, the mixed material is sprayed from the first gun head 11 in an upward oblique direction, which is combined with the way that the gunning machine makes the outer gun 10 move upward step by step, so as to expand the effective gunning area of the outer gun 10, thereby more beneficial to improve the gunning efficiency. Figure 1

[0064] Similarly, in some embodiments, please refer to Figure 2 The angle between the discharging direction of all the gun heads of the inner gun 20 and the feeding direction of the gun barrel of the inner gun 20 is the same acute angle value, which has the beneficial effect of ensuring the uniformity of the gunning of the immersed pipe 50, and combined with the way that the gunning machine makes the inner gun 20 move upward step by step, so as to expand the effective gunning area of the inner gun 20, thereby more beneficial to improve the gunning efficiency.

[0065] In some embodiments, please refer to Figure 1 and Figure 2 ​The outer gun 10 and the inner gun 20 are similar in design except for the layout of the first gun head 11 and the second gun head 21. Specifically, the gun barrel of the outer gun 10 and the inner gun 20 each includes a main pipe 31, a water jacket 32, an air pipe 33, a material pipe 34, and a water pipe 35. The main pipe 31 of the outer gun 10 is connected to the first gun head 11, and the main pipe 31 of the inner gun 20 is connected to the second gun head 21. The water jacket 32 is fixedly sleeved on the main pipe 31, and the main pipe 31 has a plurality of water inlet holes 311 spaced along the circumference. The water inlet holes 311 are connected to the water jacket 32 and the main pipe 31. One end of the air pipe 33 is connected to one end of the main pipe 31, and the other end of the air pipe 33 is connected to a gas supply connector of the gunning machine. The air pipe 33 is arranged before the water jacket 32 in the feeding direction of the main pipe 31. One end of the material pipe 34 is connected to the main pipe 31, and the other end of the material pipe 34 is connected to a material supply connector of the gunning machine. One end of the water pipe 35 is connected to the water jacket 32, and the other end of the water pipe 35 is connected to a water supply connector of the gunning machine.

[0066] In specific applications, compressed air is supplied from the gas supply connector to the main pipe 31 through the air pipe 33, and the gunning material is supplied from the material supply connector to the air pipe 33 through the material pipe 34. The gunning material is mixed with the compressed air in the air pipe 33 and continues to be fed in a high-flow manner. When the gunning material is fed to the vicinity of the water inlet holes 311 of the main pipe 31, water is supplied from the water supply connector to the water jacket 32 through the water pipe 35. The water is injected into the water jacket 32 and enters the main pipe 31 through the plurality of water inlet holes 311 spaced along the circumference. The water is mixed with the gunning material and is fed to the gun head with the compressed air. The water is mixed with the gunning material in a multi-point water inlet manner, which improves the problem of uneven mixing of the water and the gunning material in the straight-through mixer.

[0067] In some embodiments, referring to Figure 1 or Figure 2 The plurality of water inlet holes 311 are evenly spaced along the circumference of the main pipe 31, which makes the water and the gunning material more evenly mixed.

[0068] In some embodiments, the ratio of the water supply amount of the water supply connector to the material supply amount of the material supply connector is in the range of 1:0.8-1:1 when the first gunning and the second gunning are performed. The water and the material are mixed in a ratio of 1:0.8-1, and the gunning is performed after the gun head is filled with the material.

[0069] Based on the above disclosed online maintenance method for the immersed pipe 50, the inventor provides more implementable embodiments.

[0070] Referring to Figure 1, the number of the first gun head 11 of the outer gun 10 is 2, at this time the outer gun 10 can be called F type gun. The size of the effective area of the outer gun 10 with the original single nozzle in the height is 100mm, the size of the effective area of the F type gun provided by the application in the height can reach 200-250mm, the original outer gun 10 needs to be lifted 8 times, the improved outer gun 10 only needs to be lifted 4 times, that is, the outer wall of the dip tube 50 can be fully repaired.

[0071] Please refer to Figure 2 , the number of the second gun head 21 of the inner gun 20 is 2, at this time the inner gun 20 can be called Y type gun. The lifting speed of the inner gun 20 with the original single nozzle during repair is 200mm / min, then the lifting speed of the Y type gun provided by the application during repair can be set as 400mm / min, through the automatic rotation of the inner gun, the repair material can be uniformly sprayed on the inner wall of the dip tube 50, and the repair operation of the inner wall can be completed in about 2min.

[0072] The above-mentioned adjustment of the blowing pressure to 0.4MPa is an embodiment of the maximum pressure of the pressure wind provided by the air supply pipeline connected with the repair machine, limited by the site conditions, the number of the first gun head 11 of the outer gun 10 and the number of the second gun head 21 of the inner gun 20 are generally set to 2, which can achieve the beneficial effects mentioned above, and can prevent the situation that the maximum pressure of the pressure wind provided by the air supply pipeline connected with the repair machine is too small, and the spraying effect of the mixed material on the dip tube 50 cannot reach the minimum allowable degree when three or more than three gun ports of the same blowing gun simultaneously spray the mixed material.

[0073] In combination with the specific parameters involved in the above-mentioned F type gun, Y type gun and the specific process of the above-mentioned top gun for baking the dip tube 50, the inventors provide a result comparison case to fully prove the excellent effect that can be achieved in the actual application of the application scheme.

[0074] Among them, according to the application scheme and according to the above-mentioned parameters, the specific embodiment is: the repair vehicle is opened to the repair position for repair operation, the F type outer gun is lifted to perform the outer repair operation of the dip tube 50, and the operation is completed in 4min according to the above-mentioned operation process; the Y type inner gun is lifted to perform the repair operation of the dip tube 50, and the operation is completed in 3min according to the above-mentioned operation process; the repair gun chassis is rotated, the position of the repair gun is exchanged, and then the operation of the descending tube outside and the ascending tube inside is performed, and the whole repair operation time is 16min. After the repair is completed, the baking process is completed; the service life of the vacuum tank 40 according to the operation is 89 times, and the steel time is 2972min.

[0075] And the operation process is the same as the above operation process, the processing time of each process is as follows: the outer gunning time of the immersion tube 50 is 8 min, the inner gunning time of the immersion tube 50 is 6 min, the whole gunning operation time is 30 min; after the gunning is completed, low gun position fixed flow baking is adopted; the service life of the vacuum tank 40 operated according to the operation is 82 times, and the steel passing time is 2443 min.

[0076] From the above examples and comparative examples, it can be fully illustrated that the scheme of the present application can improve the service life of the vacuum tank 40 to a small extent, and significantly improve the steel passing time, which embodies the outstanding superiority of the scheme of the present application in the gunning efficiency and baking efficiency, has a positive effect on the production efficiency of the RH refining production line, and can adapt to the increasingly high production efficiency of the RH refining production line required with the development of technology.

[0077] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0078] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0079] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An online maintenance method for impregnated pipes, characterized in that, include: With at least two nozzles spaced apart on the same side of the gun barrel in the outer spray gun and at least two nozzles spaced apart on the same circumference of the gun barrel in the inner spray gun, the outer spray gun and the inner spray gun simultaneously perform the first spraying on the two immersion tubes under the vacuum tank. After the first spraying is completed, the outer spraying gun and the inner spraying gun are swapped, and the two immersion tubes are sprayed a second time simultaneously. After the second spraying is completed, the top gun is inserted into the vacuum tank from above. The top gun is used to bake the impregnation tube in a manner that gradually lowers the gun position height, with the highest gun position having the lowest baking flow rate among all gun positions except the lowest gun position, the lowest gun position having the lowest baking flow rate among all gun positions, and the lowest gun position having the longest baking time among all gun positions. The blowing air pressure in the first and second spray repairs is adapted to the number of nozzles of the external and internal spray repair guns.

2. The online maintenance method for impregnated tubes as described in claim 1, characterized in that, During the baking process of the impregnation tube by the top gun, the baking flow rate gradually increases when the gun height is at its second lowest.

3. The online maintenance method for impregnated tubes as described in claim 2, characterized in that, The baking flow rate of the top gun at other gun heights besides the lowest and second lowest is equal to the minimum baking flow rate of the top gun at the second lowest gun height.

4. The online maintenance method for impregnated tubes as described in claim 3, characterized in that, The height of the top gun is the distance between the gun head and the bottom of the vacuum tank. The process of the top gun baking the impregnation tube involves the following steps: The gun height is 8 meters, the baking flow rate is 300 NL / min, and the baking time is 2 minutes. The gun height is 7 meters, the baking flow rate is 300 NL / min, and the baking time is 2 minutes. The gun height is 6 meters, the baking flow rate is 300 NL / min, and the baking time is 2 minutes. The gun height is 6 meters, the baking flow rate is 400 NL / min, and the baking time is 2 minutes. The gun height is 6 meters, the baking flow rate is 500 NL / min, and the baking time is 2 minutes. The gun height is 5.6 meters, the baking flow rate is 300 NL / min, and the baking time is 10 minutes.

5. The online maintenance method for impregnated tubes as described in claim 1, characterized in that, In the first and second spraying operations, the spraying air pressure is the maximum pressure of the air supply duct connected to the spraying machine that can provide the pressure air.

6. The online maintenance method for impregnated tubes as described in claim 1, characterized in that, All the nozzles of the external spray gun are relatively parallel, and the angle between the discharge direction of the nozzle and the feeding direction of the gun barrel is an acute angle.

7. The online maintenance method for impregnated tubes as described in claim 1, characterized in that, The angle between the discharge direction of all the nozzles of the internal spray gun and the feeding direction of the gun barrel is the same acute angle value.

8. The online maintenance method for impregnated tubes as described in claim 1, 6, or 7, characterized in that, The gun barrels of both the external spray gun and the internal spray gun include: The main body is connected to the gun head; A water distribution jacket is fixedly sleeved on the main pipe. The main pipe has a plurality of water inlet holes spaced apart in a circumferential direction. The water inlet holes are connected to the water distribution jacket and the main pipe. The air duct is connected at one end to one end of the main pipe and at the other end to the air supply connector of the spraying machine. The air duct is located before the water distribution jacket in the feeding direction of the main pipe. The material pipe has one end connected to the body of the air duct, and the other end is used to connect to the material supply connector of the spraying machine; and The water pipe has one end connected to the water distribution jacket and the other end used to connect to the water supply connector of the spraying machine.

9. The online maintenance method for impregnated tubes as described in claim 8, characterized in that, The multiple water inlets are evenly spaced along the circumference of the main pipe.

10. The online maintenance method for impregnated tubes as described in claim 8, characterized in that, During the first and second spraying operations, the ratio of water output from the water supply connector to material output from the material supply connector is within the range of 1:0.8 to 1:1.

Images