Three-way device and pulverized coal conveying system with same

Abstract

The utility model provides a three-way device and a pulverized coal conveying system with the three-way device, the three-way device comprises a main pipeline, the main pipeline is provided with a first communicating port, a second communicating port, a first connecting port and a main flow channel, the first communicating port and the second communicating port are respectively located at two ends of the main flow channel, and the first connecting port is arranged on the side wall of the main pipeline; the branch pipeline is provided with a second connecting port, a third communicating port and a branch flow channel, the second connecting port and the third communicating port are both communicated with the branch flow channel, the second connecting port is communicated with the first connecting port, the third communicating port is arranged close to the second communicating port, and an included angle is formed between the axis of the main pipeline and the axis of the branch pipeline; the included angle between the axis of the main pipeline and the axis of the branch pipeline ranges from 22 degrees to 25 degrees, and the main pipeline and the branch pipeline are integrally forged and formed. By means of the technical scheme, the problem that in the prior art, a three-way device is extremely prone to being abraded, and consequently pulverized coal leaks can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal powder conveying system technical field, specifically, a tee device and have its coal powder conveying system. BACKGROUND

[0002] In the coal powder conveying system, tee devices are usually used to connect multiple conveying pipelines, and the structural design of the tee devices not only affects the service life of the tee devices, but also affects the stable operation of the entire coal powder conveying system.

[0003] In the prior art, tee devices are usually processed by welding, but the tee devices are frequently eroded and worn during operation, especially the welds at the tee connections, which are extremely prone to being worn through, thereby causing the tee devices to leak. This condition not only threatens the normal operation of the coal powder conveying system, but also may cause environmental accidents and bring great safety risks to maintenance work. SUMMARY

[0004] The utility model provides a tee device and have its coal powder conveying system to solve the problem of the prior art that the tee device is extremely prone to being worn and causing coal powder to leak.

[0005] According to one aspect of the utility model, a tee device is provided, which includes: a main pipeline having a first communication port, a second communication port, a first connection port, and a main flow passage, the first communication port, the second communication port, and the first connection port all being in communication with the main flow passage, the first communication port and the second communication port being located at two ends of the main flow passage, and the first connection port being provided on a side wall of the main pipeline; a branch pipeline having a second connection port, a third communication port, and a branch flow passage, the second connection port and the third communication port both being in communication with the branch flow passage, the second connection port being in communication with the first connection port, and the third communication port being provided close to the second communication port, the axis of the main pipeline and the axis of the branch pipeline having an included angle therebetween, the included angle between the axis of the main pipeline and the axis of the branch pipeline being provided to be between 22° and 25°, and the main pipeline and the branch pipeline being integrally forged and formed.

[0006] Further, the main pipeline has a first main body portion and two first connection portions, the two first connection portions being respectively located at the first communication port and the second communication port, the wall thickness of the first connection portions being greater than the wall thickness of the first main body portion, and the first connection portions being used to connect with a first pipeline of a coal powder conveying system; the branch pipeline has a second main body portion and a second connection portion, the second connection portion being located at the third communication port, the wall thickness of the second connection portion being greater than the wall thickness of the second main body portion, and the second connection portion being used to connect with a second pipeline of the coal powder conveying system.

[0007] Further, the wall thickness of the first main body portion and the second main body portion is provided to be between 15.3 mm and 16.2 mm.

[0008] Further, the first connecting part has a first bevel, an outer diameter of the first bevel gradually decreases along a direction away from the first main part, and the first bevel is used for welding and fixing with the first pipeline; the second connecting part has a second bevel, an outer diameter of the second bevel gradually decreases along a direction away from the second main part, and the second bevel is used for welding and fixing with the second pipeline.

[0009] Further, an included angle between the first bevel and the main pipe direction is arranged between 35° and 40°, and an included angle between the second bevel and the branch pipe direction is arranged between 35° and 40°.

[0010] Further, a size of the first bevel along the main pipe direction is arranged between 12.5mm and 13mm, and a size of the second bevel along the branch pipe direction is arranged between 12.5mm and 13mm.

[0011] Further, the main pipe and the branch pipe have a reinforcing part.

[0012] Further, the tee device is made of carbon steel.

[0013] According to another aspect of the utility model, a coal powder conveying system is provided, the coal powder conveying system comprises a coal powder lock hopper, a coal powder bin, a feeding tank and the tee device, the feeding inlet of the coal powder lock hopper is communicated with the first communicating port of the tee device, the feeding inlet of the feeding tank is communicated with the second communicating port of the tee device, and the discharging outlet of the coal powder bin is communicated with the third communicating port of the tee device.

[0014] Further, the feeding inlet and the second communicating port of the feeding tank have a first pipeline, the first pipeline is provided with a first valve, the discharging outlet and the third communicating port of the coal powder bin have a second pipeline, and the second pipeline is provided with a second valve.

[0015] The technical scheme of the utility model discloses, through the integral forging of the main pipeline and the branch pipeline, the existence of the weld is reduced, the overall strength and reliability of the tee device are improved, the wear of the weld of the tee device is reduced obviously, the leakage of the pulverized coal caused by the wear of the weld of the tee device is avoided, meanwhile, the service life of the tee device can be improved, the frequency of replacement and maintenance of the tee device is greatly reduced, thereby, the maintenance cost is reduced, the safety of the whole pulverized coal conveying system is improved, and the environmental accidents are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the specification of the application are used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:

[0017] Figure 1 The structure schematic view of the tee device provided by the utility model is shown.

[0018] Figure 2 The structure schematic view of the tee device provided by the utility model is shown. Figure 1 The partial enlarged view of A in the figure.

[0019] Among them, the above-mentioned drawing includes the following sign:

[0020] 10, the main pipeline;

[0021] 11, the first communication port;

[0022] 12, the second communication port;

[0023] 13, the main flow channel;

[0024] 14, the first main body part;

[0025] 15, the first connecting part;

[0026] 151, the first bevel;

[0027] 20. Branch pipes;

[0028] 21. Third connecting port;

[0029] 22. Tributary channel;

[0030] 23. Second main body section;

[0031] 24. Second connecting part;

[0032] 30. Reinforcement section. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] like Figure 1 As shown, this embodiment of the utility model provides a three-way device, which includes a main pipe 10 and a branch pipe 20. The main pipe 10 has a first connecting port 11, a second connecting port 12, a first connecting port, and a main channel 13. The first connecting port 11, the second connecting port 12, and the first connecting port are all connected to the main channel 13. The first connecting port 11 and the second connecting port 12 are located at opposite ends of the main channel 13, and the first connecting port is disposed on the side wall of the main pipe 10. The branch pipe 20 has a second connecting port, a third connecting port 21, and a branch channel 22. The second connecting port and the third connecting port 21 are both connected to the branch channel 22. The second connecting port is connected to the first connecting port. The third connecting port 21 is disposed close to the second connecting port 12. There is an angle between the axis of the main pipe 10 and the axis of the branch pipe 20, which is set between 22° and 25°. The main pipe 10 and the branch pipe 20 are integrally forged.

[0035] The technical scheme of the application is characterized in that the main pipe 10 and the branch pipe 20 are integrally forged and formed, thereby reducing the existence of welds, improving the overall strength and reliability of the tee device, significantly reducing the wear of the welds of the tee device, avoiding the leakage of coal powder caused by the wear of the welds of the tee device, prolonging the service life of the tee device, greatly reducing the frequency of replacement and maintenance of the tee device, thereby reducing the maintenance cost and improving the safety of the entire coal powder conveying system, and avoiding environmental accidents. In addition, when the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is less than 22°, the speed of the coal powder at the connection between the main pipe 10 and the branch pipe 20 is too fast, thereby causing the high-speed flowing coal powder to erode the connection between the tee device and other pipelines, resulting in the connection between the tee device and other pipelines being easily eroded. When the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is greater than 25°, the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is too large, thereby causing the speed of the coal powder eroding the erosion point on the branch pipe 20 to be too fast, thereby causing the erosion point on the branch pipe 20 to be easily damaged. Therefore, the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is set to be between 22° and 25°, which can avoid the connection between the tee device and other pipelines being eroded, and can avoid the erosion point on the branch pipe 20 being damaged, thereby prolonging the service life of the tee device, improving the reliability of the tee device, and making the tee device meet the size requirements in actual production process.

[0036] Optionally, the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 can be set to 22°, 23° or 25°. In the application, the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is set to 25°.

[0037] In actual use, when the coal powder flows through the tee device, the coal powder will erode a point on the branch pipe 20, which is defined as the erosion point. When the angle between the axis of the main pipe 10 and the axis of the branch pipe 20 is too large, the speed of the coal powder eroding the erosion point is relatively fast.

[0038] In addition, in the prior art, when the tee device is worn, there is a safety risk in online repair. Since the tee device is a pressure-bearing pipe, the pressure-bearing pipe is not allowed to be frequently repaired, otherwise it may adversely affect the performance and service life of the tee device. However, in the application, the additional safety risks and environmental impacts caused by frequent replacement or online repair are reduced.

[0039] As Figure 2As shown, the main pipe 10 has a first main body part 14 and two first connecting parts 15, the two first connecting parts 15 are respectively located at the first communication port 11 and the second communication port 12, the wall thickness of the first connecting part 15 is greater than that of the first main body part 14, and the first connecting part 15 is used to connect with the first pipeline of the pulverized coal conveying system. In this way, the structural strength and wear resistance of the first connecting part 15 can be significantly enhanced. Since the first connecting part 15 is the part directly connected with the first pipeline of the pulverized coal conveying system, the thickened wall thickness can resist the scouring and wear caused by the high-speed flow of the pulverized coal, prolong the service life of the first connecting part 15, and reduce the risk of leakage caused by wear.

[0040] The branch pipe 20 has a second main body part 23 and a second connecting part 24, the second connecting part 24 is located at the third communication port 21, the wall thickness of the second connecting part 24 is greater than that of the second main body part 23, and the second connecting part 24 is used to connect with the second pipeline of the pulverized coal conveying system. In this way, the structural strength and wear resistance of the second connecting part 24 can be significantly enhanced. Since the second connecting part 24 is the part directly connected with the second pipeline of the pulverized coal conveying system, the thickened wall thickness can resist the scouring and wear caused by the high-speed flow of the pulverized coal, prolong the service life of the first connecting part 15, and reduce the risk of leakage caused by wear.

[0041] Specifically, the wall thickness of the first main body part 14 and the second main body part 23 is set to be between 15.3mm and 16.2mm. When the wall thickness of the first main body part 14 and the second main body part 23 is less than 15.3mm, the structural strength of the first main body part 14 and the second main body part 23 is low, and they are easily damaged during use; when the wall thickness of the first main body part 14 and the second main body part 23 is greater than 16.2mm, the processing cost of the first main body part 14 and the second main body part 23 will be increased; therefore, the wall thickness of the first main body part 14 and the second main body part 23 is set to be between 15.3mm and 16.2mm, so that the structural strength of the first main body part 14 and the second main body part 23 is ensured, the processing cost of the first main body part 14 and the second main body part 23 is reduced, and the first main body part 14 and the second main body part 23 meet the size requirements and connection requirements in the actual production process.

[0042] Optionally, the wall thickness of the first main body part 14 and the second main body part 23 can be set to 15.3mm, 15.8mm or 16.2mm, and in this application, the wall thickness of the first main body part 14 and the second main body part 23 is set to 15.8mm.

[0043] Further, the first connecting portion 15 has a first bevel 151, the outer diameter of the first bevel 151 gradually decreases in the direction away from the first main body portion 14, and the first bevel 151 is used for welding and fixing with the first pipeline. In the welding operation, the first bevel 151 can ensure that the weld gradually penetrates from the outside to the inside, promote the full combination of the welding material and the first connecting portion 15, and thus form a high-quality welded joint. Therefore, the above structure provides better weldability for the welding process, improves the reliability and stability of the welding. Because the contact area between the weld and the first connecting portion 15 is increased, the sealing performance is also significantly improved, effectively preventing the leakage of coal powder from the welded joint under high-pressure working conditions, and ensuring the safe operation of the system. The wall thickness of the first connecting portion 15 is relatively thick, and the outer diameter of the first bevel 151 gradually decreases, which can reduce the stress concentration of the welding area. In the welding process, stress concentration is one of the main reasons for the cracking of the weld. By optimizing the wall thickness and bevel design, the welding stress can be more evenly distributed, reducing the generation of cracks, and thus improving the overall reliability of the tee device.

[0044] The second connecting portion 24 has a second bevel, the outer diameter of the second bevel gradually decreases in the direction away from the second main body portion 23, and the second bevel is used for welding and fixing with the second pipeline. In the welding operation, the second bevel can ensure that the weld gradually penetrates from the outside to the inside, promote the full combination of the welding material and the second connecting portion 24, and thus form a high-quality welded joint. Therefore, the above structure provides better weldability for the welding process, improves the reliability and stability of the welding. Because the contact area between the weld and the second connecting portion 24 is increased, the sealing performance is also significantly improved, effectively preventing the leakage of coal powder from the welded joint under high-pressure working conditions, and ensuring the safe operation of the system. The wall thickness of the second connecting portion 24 is relatively thick, and the outer diameter of the second bevel gradually decreases, which can reduce the stress concentration of the welding area. In the welding process, stress concentration is one of the main reasons for the cracking of the weld. By optimizing the wall thickness and bevel design, the welding stress can be more evenly distributed, reducing the generation of cracks, and thus improving the overall reliability of the tee device.

[0045] The included angle between the first bevel 151 and the radial direction of the main pipeline 10 is set to be between 35° and 40°, and the included angle between the second bevel and the radial direction of the branch pipeline 20 is set to be between 35° and 40°.

[0046] In this way, when the included angle between the first groove 151 and the main pipe 10 is less than 35°, the filling welding material at the first groove 151 is too little, thereby affecting the welding effect at the first groove 151; when the included angle between the first groove 151 and the main pipe 10 is greater than 40°, the angle of the first groove 151 is too large, and a large amount of welding material needs to be used, thereby increasing the welding cost, and meanwhile, a gap is prone to be generated in the welding process, thereby affecting the welding effect. Therefore, the included angle between the first groove 151 and the main pipe 10 is set to be between 35° and 40°, so that the welding cost can be reduced, and meanwhile, the welding effect can be ensured.

[0047] Optionally, the included angle between the first groove 151 and the main pipe 10 can be set to 35°, 37° or 40°. In this application, the included angle between the first groove 151 and the main pipe 10 is set to 37°.

[0048] When the included angle between the second groove and the branch pipe 20 is less than 35°, the filling welding material at the second groove is too little, thereby affecting the welding effect at the second groove; when the included angle between the second groove and the branch pipe 20 is greater than 40°, the angle of the second groove is too large, and a large amount of welding material needs to be used, thereby increasing the welding cost, and meanwhile, a gap is prone to be generated in the welding process, thereby affecting the welding effect. Therefore, the included angle between the second groove and the branch pipe 20 is set to be between 35° and 40°, so that the welding cost can be reduced, and meanwhile, the welding effect can be ensured.

[0049] Optionally, the included angle between the second groove and the branch pipe 20 can be set to 35°, 37° or 40°. In this application, the included angle between the second groove and the branch pipe 20 is set to 37°.

[0050] Specifically, the dimension of the first groove 151 along the main pipe 10 is set to be between 12.5 mm and 13 mm, and the dimension of the second groove along the branch pipe 20 is set to be between 12.5 mm and 13 mm.

[0051] In this way, when the dimension of the first groove 151 along the main pipe 10 is less than 12.5 mm, the dimension of the first groove 151 along the main pipe 10 is too small, so that the structural strength of the first groove 151 is reduced, and the first groove 151 is prone to be damaged; when the dimension of the first groove 151 along the main pipe 10 is greater than 13 mm, the dimension of the first groove 151 along the main pipe 10 is too large, so that the processing cost of the main pipe 10 is increased; therefore, the dimension of the first groove 151 along the main pipe 10 is set to be between 12.5 mm and 13 mm, so that the structural strength of the first groove 151 can be ensured, and meanwhile, the processing cost of the main pipe 10 can be reduced.

[0052] Optionally, the first bevel 151 can be set to 12.5mm, 12.7mm or 13mm in the radial direction of the main pipe 10. In this application, the first bevel 151 is set to 12.7mm in the radial direction of the main pipe 10.

[0053] When the second bevel is less than 12.5mm in the radial direction of the branch pipe 20, the second bevel is too small in the radial direction of the branch pipe 20, which reduces the structural strength of the second bevel and makes the second bevel prone to damage; when the second bevel is greater than 13mm in the radial direction of the branch pipe 20, the second bevel is too large in the radial direction of the branch pipe 20, which increases the processing cost of the branch pipe 20; therefore, the second bevel is set to between 12.5mm and 13mm in the radial direction of the branch pipe 20, which can ensure the structural strength of the second bevel and reduce the processing cost of the branch pipe 20.

[0054] Optionally, the second bevel 152 can be set to 12.5mm, 12.7mm or 13mm in the radial direction of the branch pipe 20. In this application, the second bevel 152 is set to 12.7mm in the radial direction of the branch pipe 20.

[0055] Further, the main pipe 10 and the branch pipe 20 have a reinforcing portion 30 therebetween. In this way, the structural strength of the tee device can be further improved, the service life of the tee device can be further improved, and damage to the tee device can be avoided.

[0056] Specifically, the tee device is made of carbon steel.

[0057] In the prior art, the inclined tee is made of 10-inch A333GrSCH60 low-temperature seamless steel pipe, which meets the use requirements to some extent, but its wear resistance is insufficient, and long-term operation can easily cause wear and leakage.

[0058] However, in this application, the tee device is made of A350LF2 low-temperature carbon steel forgings, which significantly improves the wear resistance and reliability of the tee device.

[0059] A350LF2 material focuses on excellent low-temperature toughness and welding performance, and is widely used in the manufacture of low-temperature equipment and components in the fields of petroleum, chemical industry, aerospace, etc. Its good low-temperature toughness and welding performance can maintain high strength and toughness in an environment of-46℃-183℃.

[0060] At the same time, the corrosion resistance and fatigue resistance of A350LF2 steel are also good.

[0061] When A350LF2 steel is used to process the tee device, the following points need to be noted:

[0062] 1. Heating temperature and time: Heating temperature and time are one of the key process parameters for A350 LF2 low temperature forging technology. If the heating temperature is too high, it will cause overheating of the material and reduce its mechanical properties. If the heating temperature is too low, it will not be able to fully soften the material, affecting the forging effect. Therefore, the heating temperature and time need to be determined according to the specific forging process and material specifications.

[0063] 2. Cooling speed: Cooling speed is also one of the key process parameters for A350 LF2 low temperature forging technology. Proper cooling speed can control the material's organizational transformation and phase change, thereby obtaining the required performance. In actual operation, the cooling speed needs to be determined according to the material's composition, specifications, and forging process.

[0064] 3. Application advantages: Equipment and components manufactured using A350 LF2 low temperature forging technology have high strength, toughness, and corrosion resistance, which can meet the needs of different fields. At the same time, this technology can also optimize process parameters to improve the material's mechanical properties and fatigue resistance, thereby prolonging the service life of the equipment.

[0065] A350 LF2 low temperature carbon steel forgings need to go through the following steps:

[0066] 1. Prepare the blank: Select appropriate raw materials, heat, roll, forge, etc. Process to make a suitable blank for forging.

[0067] 2. Heating: Heat the blank to the appropriate temperature to make it have good plasticity and toughness, which is convenient for forging.

[0068] 3. Forging: Forging on the heated blank, according to the different shapes and sizes of the product, choose the appropriate forging method and equipment, such as free forging, die forging, etc. In the forging process, the temperature, deformation, forging speed, etc. Parameters need to be controlled to ensure the quality and performance of the forgings.

[0069] 4. Cooling: After forging, the forgings are quickly cooled to room temperature to prevent deformation or cracking.

[0070] 5. Heat treatment: According to the needs, the forgings are heat treated to adjust their mechanical properties and corrosion resistance.

[0071] 6. Machining and inspection: The forgings are machined and inspected to ensure that their size, shape, and performance meet the requirements.

[0072] In the forging process, the following points need to be paid attention to:

[0073] 1. Control the heating temperature and time to avoid overburning, decarburization, and other defects.

[0074] 2. Control the deformation amount and deformation mode during forging to avoid defects such as cracks and inclusions.

[0075] 3. Control the cooling speed and time to avoid defects such as deformation and cracks.

[0076] 4. Control the heat treatment process parameters such as temperature, time, and atmosphere to ensure the performance and corrosion resistance of the forged parts.

[0077] 5. Strictly control the dimensional accuracy and surface quality during processing and inspection to ensure the quality and performance of the final product.

[0078] The forging of A350LF2 low-temperature carbon steel forgings requires strict control of process parameters and operation procedures to ensure the quality and stability of each link. At the same time, quality detection and control should be strengthened to timely discover and handle defects and problems, ensuring that the quality and performance of the final product meet the requirements.

[0079] The three-way device of the device implements the following steps for tool body forging using a forging machine according to the characteristics of A350LF2 low-temperature carbon steel forging material:

[0080] 1. According to the drawing size, use an electric sawing bed to cut out a forging blank with a total length of 1196mm and a width of 625mm that has passed inspection, and the shape of the blank is a long column.

[0081] 2. Place the blank in the heating furnace and heat it to 1200℃.

[0082] 3. Install a left push head and a right push head at the top of the left oil cylinder and the right oil cylinder of a 20000T frame-type multi-directional die liquid forging press, respectively, and install the upper and lower dies of the forging die below the upper oil cylinder and above the base of the liquid forging press; use a spraying method to apply conventional water-based graphite and glass lubricant to the forging die and the heated blank, respectively; then place the heated blank on the lower die of the forging die; finally, move the upper oil cylinder to close the upper and lower dies of the forging die.

[0083] 4. According to the pre-calculated pressing data of the three oil cylinders, adjust the oil valves of each oil cylinder to make each oil cylinder reach the best travel speed, pressure, and push distance, first close the upper oil cylinder, press P≤30MPa, then start the left and right oil cylinders at the same time, press P≤25MPa, monitor the temperature of the forging process at any time during the pressing process, and when the temperature is lower than the optimal forging temperature, stop forging due to increased resistance, reheat the workpiece to return to the forgeable temperature zone, and reforge.

[0084] 5. After die forging, remove the upper die, left push head, and right push head of the forging die, take out the semi-finished product from the lower die, and place it in a heat treatment furnace for strict furnace cooling and annealing treatment.

[0085] 6. Heat treatment reference: GB / T1220 and GB / T14383-2008, the heat treatment of semi-finished products according to the drawing requirements for machining:

[0086] (1) The three-way device of the forging is machined according to the above-mentioned size requirements.

[0087] (2) The inspection and acceptance of the three-way device of the forging refers to GB / T1220 and GB / T14383-2008.

[0088] (3) After the manufacturing is completed, 100% magnetic powder detection is carried out according to NB / T4730-2005 for pressure equipment nondestructive testing, and I level is qualified. The size tolerance of the forging and the machining allowance are evaluated according to JB / T7528-1994 forging quality evaluation method.

[0089] 7. The acceptance standard of the three-way device of the forging is GB / T1220 and GB / T14383-2008 product inspection. After the qualified forging three-way device is transported to the site, the bevel of the forging three-way device is ground and welded. After welding, γ-ray detection is carried out on the weld.

[0090] Another embodiment of the utility model provides a kind of pulverized coal conveying system, and the pulverized coal conveying system includes coal powder lock hopper, coal powder bin, feed tank and the three-way device provided above, the feed inlet of coal powder lock hopper is communicated with the first communication port 11 of three-way device, the feed inlet of feed tank is communicated with the second communication port 12 of three-way device, and the discharge outlet of coal powder bin is communicated with the third communication port 21 of three-way device.

[0091] So set, three-way device connects coal powder lock hopper, coal powder bin and feed tank, because of its special structure and position, pipeline at this place bears higher flow rate and pressure in running process, and temperature is as high as 80 DEG C. Using above-mentioned three-way device, coal powder leakage can be avoided, and the safety of entire pulverized coal conveying system is improved, to avoid environmental accident.

[0092] Among them, the service life of the above-mentioned three-way device reaches more than 10 years, while reducing the on-site maintenance pressure and repair and maintenance cost, and saving repair and replacement cost 656 million per year, greatly improving the safety of pulverized coal conveying system.

[0093] Specifically, the feed inlet of feed tank and the second communication port 12 have first pipeline, and first valve is arranged on first pipeline, and the first connecting part 15 at second communication port 12 is communicated with first pipeline. The discharge outlet of coal powder bin and the third communication port 21 have second pipeline, and second valve is arranged on second pipeline.

[0094] Among them, the feed inlet of coal powder lock hopper and the first communication port 11 of three-way device have third pipeline, and the first connecting part 15 at first communication port 11 is communicated with third pipeline.

[0095] In this way, the automation degree of the pulverized coal conveying system can be improved, and the first pipeline and the second pipeline can be controlled conveniently.

[0096] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0097] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically indicated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and equipment known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and equipment should be regarded as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0098] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of contrary statements, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0099] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0100] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used solely to differentiate one element from another, and are used in the context of this application without implying any specific order, or order of precedence. Accordingly, a first element that follows an operation can be performed before, after, or at the same time as a second element that precedes the operation.

[0101] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes of practicing the application known to the inventors at this time, but also of enabling others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, the above description is intended to be illustrative, but not restrictive, of the scope of the present application. All patents and patent applications mentioned herein are incorporated by reference in their entirety.

Claims

1. A tee device, characterized in that The tee device comprises: a main pipe (10) having a first communication port (11), a second communication port (12), a first connecting port and a main flow channel (13), the first communication port (11), the second communication port (12) and the first connecting port all communicating with the main flow channel (13), the first communication port (11) and the second communication port (12) being respectively located at two ends of the main flow channel (13), the first connecting port being arranged on a side wall of the main pipe (10); a branch pipe (20) having a second connecting port, a third communication port (21) and a branch flow channel (22), the second connecting port and the third communication port (21) both communicating with the branch flow channel (22), the second connecting port communicating with the first connecting port, the third communication port (21) being arranged close to the second communication port (12), an angle between an axis of the main pipe (10) and an axis of the branch pipe (20) being arranged between 22° and 25°, the main pipe (10) and the branch pipe (20) being integrally forged and formed.

2. The tee device according to claim 1, wherein the main pipe (10) has a first main body portion (14) and two first connecting portions (15), the two first connecting portions (15) being respectively located at the first communication port (11) and the second communication port (12), a wall thickness of the first connecting portion (15) being greater than a wall thickness of the first main body portion (14), the first connecting portion (15) being used for connecting with a first pipeline of a pulverized coal conveying system; the branch pipe (20) has a second main body portion (23) and a second connecting portion (24), the second connecting portion (24) being located at the third communication port (21), a wall thickness of the second connecting portion (24) being greater than a wall thickness of the second main body portion (23), the second connecting portion (24) being used for connecting with a second pipeline of the pulverized coal conveying system.

3. The tee device of claim 2, wherein The wall thickness of the first main body portion (14) and the second main body portion (23) is arranged between 15.3 mm and 16.2 mm.

4. The tee device according to claim 2, wherein the first connecting portion (15) has a first bevel (151), an outer diameter of the first bevel (151) gradually decreasing in a direction away from the first main body portion (14), the first bevel (151) being used for welding and fixing with the first pipeline; the second connecting portion (24) has a second bevel, an outer diameter of the second bevel gradually decreasing in a direction away from the second main body portion (23), the second bevel being used for welding and fixing with the second pipeline.

5. The tee device of claim 4, wherein An angle between the first bevel (151) and a radial direction of the main pipe (10) is arranged between 35° and 40°, an angle between the second bevel and a radial direction of the branch pipe (20) is arranged between 35° and 40°.

6. The tee device of claim 4, wherein The first groove (151) has a radial dimension of 12.5-13 mm along the main pipeline (10), and the second groove has a radial dimension of 12.5-13 mm along the branch pipeline (20).

7. The tee device of claim 1, wherein The main pipeline (10) and the branch pipeline (20) have a reinforcing part (30) therebetween.

8. The tee device of claim 1, wherein The tee device is made of carbon steel.

9. A pulverized coal delivery system characterized by, The pulverized coal conveying system comprises a pulverized coal lock hopper, a pulverized coal bin, a feeding tank and the tee device according to any one of claims 1-8, the feeding inlet of the pulverized coal lock hopper is communicated with the first communication port (11) of the tee device, the feeding inlet of the feeding tank is communicated with the second communication port (12) of the tee device, and the discharging outlet of the pulverized coal bin is communicated with the third communication port (21) of the tee device.

10. The pulverized coal delivery system of claim 9, wherein, The feeding inlet of the feeding tank and the second communication port (12) have a first pipeline therebetween, and the first pipeline is provided with a first valve; the discharging outlet of the pulverized coal bin and the third communication port (21) have a second pipeline therebetween, and the second pipeline is provided with a second valve.

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