Pressurizing feeding device in front of drying tower

Abstract

The utility model discloses a pressurizing feeding device in front of a drying tower, and mainly relates to the field of dye drying processes. Comprising a material main pipe, a premixing passage, a preheating pipe and a feeding main pipe which are arranged according to the dye conveying direction, the material main pipe is used for being connected with dye source materials, an auxiliary material pipe is connected to the premixing passage and used for being connected with an auxiliary material source, an auxiliary heating pipe is arranged outside the preheating pipe, and the auxiliary heating pipe is connected with the feeding main pipe. The auxiliary heating pipe is filled with fluid with the temperature higher than the dye temperature, the main feeding pipe is used for being connected with an atomizing nozzle of a drying tower, and a booster pump is arranged on the main feeding pipe. The dye preheating device has the advantages that dye can be preheated before entering the drying tower, a port for adding auxiliary materials is reserved, efficiency and quality of the drying process are improved, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of dye drying processes, and specifically to a pressurized feeding device before a drying tower. Background Technique

[0002] After the pre - processing of dyes is completed, they need to enter a drying tower for drying and powder making to obtain the final dye powder product. When dyes are spray - dried, precisely controlling the temperature plays an important role in obtaining better drying effects, product yields, and product quality.

[0003] The process parameters of dye spray drying usually select: the inlet air temperature is 220°C - 280°C, and the outlet air temperature is 90°C - 110°C. In production, the control of this temperature is not ideal. If the temperature is too low, it is easy to cause insufficient drying, resulting in higher moisture retention in particles during the falling - rate drying stage, increasing the adhesion percentage, thus affecting the fluidity and storage stability of the product. And it causes problems such as product agglomeration and wall sticking. If the temperature is too high, it may affect the stability of the product, causing over - heat decomposition and coking, thus leading to color change of the dye and affecting the product quality. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pressurized feeding device before a drying tower, which can pre - heat the dyes before entering the drying tower, reserve a port for adding auxiliary materials, improve the efficiency and quality of the drying process, and reduce energy consumption.

[0005] To achieve the above - mentioned purpose, the utility model is realized through the following technical solutions:

[0006] A pressurized feeding device before a drying tower includes a main material pipe, a premixing passage, a pre - heating pipe, and a main feeding pipe arranged according to the dye conveying direction. The main material pipe is used to connect with the source material of dyes. An auxiliary material pipe is connected to the premixing passage, and the auxiliary material pipe is used to connect with the auxiliary material source. An auxiliary heat pipe is arranged outside the pre - heating pipe, and a fluid with a temperature higher than that of the dyes is filled in the auxiliary heat pipe. The main feeding pipe is used to connect with the atomizing nozzle of the drying tower, and a booster pump is arranged on the main feeding pipe.

[0007] A mixer is arranged in parallel with the premixing passage between the main material pipe and the pre - heating pipe. The mixer includes a liquid inlet pipe, an air chamber pipe, and a diffusion pipe that are hermetically connected in sequence according to the material flow direction. A nozzle with a tapered narrowing is arranged at one end of the liquid inlet pipe communicating with the air chamber pipe. A connecting pipe is arranged between the air chamber pipe and the premixing passage. The auxiliary material pipe is arranged in front of the incoming material of the connecting pipe. The connecting pipe and the premixing passage are connected through a second three - way valve, and the second three - way valve is an L - type three - way valve for alternative connection.

[0008] The material supervisor is connected to the premixing path and the mixer through a first three-way valve. The premixing path and the mixer are connected to the preheating pipe through a fourth three-way valve. The first three-way valve has two connection states, namely, the material supervisor is connected to the mixer and the premixing path simultaneously, or the material supervisor is connected to the premixing path. The fourth three-way valve has two connection states, namely, it is connected to the premixing path or the mixer respectively.

[0009] The preheating pipe is a flat pipe extending vertically. The auxiliary heating pipe has a U-shaped structure. The top end of the auxiliary heating pipe is provided with an arc-shaped 180-degree bend, so that the bottom end of the auxiliary heating pipe is provided with an inlet and an outlet respectively. A heat energy pipe and a return pipe are arranged below the auxiliary heating pipe. The heat energy pipe is used to connect to a fluid source with heat energy. The fluid source comes from the waste heat recovery of the drying tower. The inlet is connected to the heat energy pipe, and the outlet is connected to the return pipe.

[0010] A plurality of liquid outlet joints are arranged on the preheating pipe along its height direction. The liquid outlet joints are connected to the same confluence pipe through a fifth valve. The confluence pipe is connected to the feeding main pipe, and one of the plurality of liquid outlet joints is opened selectively.

[0011] A plurality of temperature sensors are installed in the preheating pipe along its height direction.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] By preheating the dye before feeding, the temperature of the dye is increased, the problem of weakened atomization effect caused by low-temperature dye is solved, the drying efficiency and drying quality are improved, energy consumption is reduced, and it helps to improve the product quality and consistency. At the same time, auxiliary materials can be added according to the needs of the dye to improve the stability of the dye during high-temperature atomization drying. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of the atomization drying system of the present utility model.

[0015] Figure 2 is a schematic diagram of the material flow of the present utility model in the mode of adding auxiliary materials.

[0016] Figure 3 is a schematic diagram of the material flow of the present utility model in the mode of not adding auxiliary materials.

[0017] Figure 4 is a schematic diagram of the internal structure of the mixer of the present utility model.

[0018] Figure 5 is a front view schematic diagram of the preheating pipe of the present utility model.

[0019] Figure 6 is a side view schematic diagram of the preheating pipe of the present utility model.

[0020] Reference numerals shown in the drawings:

[0021] 1. First three-way valve; 2. Second three-way valve; 3. Third valve; 4. Fourth three-way valve; 5. Fifth valve; 6. Main material pipe; 7. Mixer; 8. Premixing passage; 9. Auxiliary material pipe; 10. Preheating pipe; 11. Main feeding pipe; 12. Liquid inlet pipe; 13. Air chamber pipe; 14. Diffusion pipe; 15. Connecting pipe; 16. Feeding joint; 17. Liquid outlet joint; 18. Confluence pipe; 19. Booster pump; 20. Auxiliary heating pipe; 21. Heat energy pipe; 22. Return pipe. Detailed implementation manners

[0022] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by this application.

[0023] For the instruments, reagents, materials, etc. involved in the following embodiments, unless otherwise specified, they are all conventional instruments, reagents, materials, etc. existing in the prior art and can be obtained through regular commercial channels. For the experimental methods, detection methods, etc. involved in the following embodiments, unless otherwise specified, they are all conventional experimental methods, detection methods, etc. existing in the prior art.

[0024] As Figure 1 shown, in the figure, for the convenience of understanding the entire drying process, the situation of the entire system is shown. Among them, the spray drying tower is located in the center, the hot air system is located on the left side of the drying tower, and the fan at the bottom sends air upward. After passing through the heat source above the blower, hot air for drying is formed and sent into the top of the drying tower through a pipeline, forming hot air blown into the tower. In the center of the top of the drying tower is an atomizing nozzle that sprays downward. The top end of the nozzle is connected to the present feeding device. The feeding device is essentially a feeding system based on pipeline connection and is used to provide dyes to the nozzle at the top of the drying tower. Specifically, it includes: main material pipe 6, main feeding pipe 11, auxiliary material pipe 9, mixer 7, premixing passage 8, and preheating pipe 10;

[0025] The main material pipe 6 is connected to the dye source. It can be directly connected in continuous process production and communicated with the dye pipeline of the previous process, or it can be connected to a cylinder containing dyes, and the dye is pumped directionally through common pumps such as peristaltic pumps.

[0026] The auxiliary material pipe 9 is used to communicate with the added auxiliary materials. For example, auxiliary agents such as anti-coking agents are added to prevent overheating and deterioration. For example, if a water-soluble anti-coking agent is used, sodium sulfite, sodium bisulfite, sulfamic acid, etc. can be used. The addition amount usually does not exceed 5% of the dye weight. Therefore, the addition amount is very small, and direct addition is likely to cause uneven mixing. However, using a separate stirring storage tank will result in equipment redundancy, cost waste, and efficiency reduction. Therefore, in this design, a two-step pipeline mixing method is adopted, specifically as follows:

[0027] One end of the main material pipe 6 is connected to the material source, and the other end of the main material pipe 6 is respectively connected to the premixing path 8 and the mixer 7 through the first three-way valve 1. The premixing path 8 is a material pipeline parallel to the mixer 7. Through the first three-way valve 1, two connection states can be selected: the main material pipe 6 is connected to the mixer 7 and the premixing path 8, or the main material pipe 6 is connected to the premixing path 8.

[0028] The mixer 7 adopts a Venturi structure, including: a liquid inlet pipe 12, an air chamber pipe 13, and a diffuser pipe 14 that are connected in sequence according to the liquid flow direction;

[0029] One end of the liquid inlet pipe 12 is connected to the first three-way valve 1 through a pipeline, and the other end of the liquid inlet pipe 12 is a nozzle with a tapered narrowing. The nozzle is inserted into the air chamber pipe 13 and is sealedly connected to the air chamber pipe 13. Based on the negative pressure obtained by the nozzle, the material on the premixing path 8 is sucked and mixed. Through the enlarged trumpet-shaped pipe cavity inside the diffuser pipe 14, the uniform mixing of the dye and the dye containing auxiliary materials is realized.

[0030] A connecting pipe 15 is provided between the air chamber pipe 13 and the premixing path 8. An auxiliary material pipe 9 is connected to the premixing path 8. According to the material flow direction, the auxiliary material pipe 9 is arranged in front of the connecting pipe 15, so that the dye first flows through the auxiliary material pipe 9 and then through the connecting pipe 15. A third valve 3 and an auxiliary material pump are provided on the auxiliary material pipe 9. The auxiliary material pump is used to pump the auxiliary material into the premixing path 8 to realize the addition of auxiliary materials to the dye material. The connecting pipe 15 and the premixing path 8 are connected through a second three-way valve 2. The second three-way valve 2 has an L-shaped port and includes two connection states: the premixing path 8 is connected to the connecting pipe 15, or the premixing path 8 is not connected to the connecting pipe 15. When the premixing path 8 is connected to the connecting pipe 15, the third valve 3 is opened, which is the mode of adding auxiliary materials. When the premixing path 8 is not connected to the connecting pipe 15, the third valve 3 is closed, and the dye only passes through the premixing path 8 without mixing auxiliary materials.

[0031] The preheating pipe 10 is an upright pipe, and a feed joint 16 is provided at the bottom end of the preheating pipe 10. The premixing passage 8 and the mixer 7 are connected to the liquid inlet joint through the No. 4 three-way valve 4. The No. 4 three-way valve 4 is opened and closed to achieve communication with the mixer 7 or the premixing passage 8. The preheating pipe 10 is provided with a plurality of parallel liquid outlet joints 17 along its height direction, and the liquid outlet joints 17 are respectively installed with No. 5 valves 5. The liquid outlet joints 17 are all connected to the manifold 18 through the No. 5 valves 5. The manifold 18 is connected to the feed main 11. A booster pump 19 is installed on the manifold 18 or the feed main 11 to increase the material pressure and improve the spray effect.

[0032] The preheating tube 10 is a flat tube extending vertically. The thickness of the preheating tube 10 is relatively thin. An auxiliary heat pipe 20 is provided on the outside of the preheating tube 10. The auxiliary heat pipe 20 is a door-shaped structure. The top of the auxiliary heat pipe 20 is provided with an arc-shaped 180-degree bend, so that the bottom end of the auxiliary heat pipe 20 has two pipe openings, namely an inlet and an outlet. A heat energy pipe 21 and a return pipe 22 are provided below the auxiliary heat pipe 20. The heat energy pipe 21 is used to connect a fluid source with heat energy. Based on this example, the waste heat of the drying tower can be recovered, that is, the waste heat after spraying can be collected. And supply heat to the auxiliary heat pipe 20, or connect waste hot water / gas from other processes. The manifold 18 is used to collect the reflux fluid. The inlet is connected to the heat energy pipe 21, and the outlet is connected to the return pipe 22. Based on the above structure, the auxiliary heat pipe 20 is easy to disassemble. As the heat energy fluid enters the auxiliary heat pipe 20 from the inlet, it moves upward to the top of the preheating pipe 10 and then flows downward, and finally enters the return pipe 22 from the bottom outlet to provide heat energy to the preheating pipe 10. The flatter pipe of the preheating pipe 10 can improve heat exchange, and the door-shaped auxiliary heat pipe 20 is easy to install and disassemble.

[0033] A temperature sensor is installed at the inner end of each liquid outlet joint 17, or at a position inside the preheating tube 10 at a height corresponding to the liquid outlet joint 17, to determine the temperature of the dye at that position. When the temperature is close to the required temperature, the liquid outlet joint 17 at the corresponding height is opened, and the dye is connected to the manifold 18 to preheat the dye to an appropriate temperature, thereby reducing the adverse effects of low dye temperature on drying efficiency and product quality.

[0034] Based on the above structure, the feeding process can include two modes: adding auxiliary materials and not adding auxiliary materials:

[0035] Add auxiliary material mode: Figure 2As shown in the figure, the dye enters the feeding system of this device from the main material pipe 6, is shunted by the first three-way valve 1 and is respectively connected to the mixer 7 and the premixing path 8. The auxiliary material pipe 9 on the premixing path 8 adds a small amount of auxiliary materials to the dye in the premixing path 8. Part of the dye with auxiliary materials is mixed with the dye in the mixer 7 from the connecting pipe 15, solving the problem of uniform mixing with a small amount of auxiliary materials. The mixed dye enters the preheating pipe 10 through the fourth three-way valve 4 and is discharged to the confluence pipe 18 from a certain liquid outlet joint 17 according to the material temperature, and is sent to the atomizing nozzle of the drying tower after being pressurized;

[0036] Mode without adding auxiliary materials: As Figure 3 shown in the figure, the dye enters the main material pipe 6 and is only connected to the premixing path 8 through the first three-way valve 1. The third valve 3 of the auxiliary material pipe 9 on the premixing path 8 is closed. The dye in the premixing path 8 is connected to the preheating pipe 10 through the fourth three-way valve 4 for feeding, and is discharged to the confluence pipe 18 from a certain liquid outlet joint 17 according to the material temperature, and is sent to the atomizing nozzle of the drying tower after being pressurized;

[0037] With the above structure, this feeding device can achieve auxiliary management of the temperature control of the dye material for the process of dye atomization drying. By preheating the material in advance, the temperature difference between the dye temperature and the drying temperature is reduced, which helps to improve the drying efficiency, solve the quality problems and efficiency problems caused by too low temperature, and reduce energy consumption and improve the product consistency. At the same time, the control of the temperature upper limit is achieved through stepped discharging. Through heat exchange for temperature rise, the control of the material temperature often has hysteresis. If continuous production is not sacrificed, our method of timely discharging the material can avoid the problem of too high temperature. In addition, the adaptation of auxiliary material addition is also achieved through the parallel mixer 7 and premixing path 8. It can directly feed without adding auxiliary materials, or add auxiliary materials according to the dye characteristics. And the added method takes into account that the content of auxiliary materials is small. First, part of the dye is shunted to add auxiliary materials, and then the dye containing auxiliary materials is mixed. The mixing effect is good and the application is flexible, meeting the production requirements.

Claims

1. A pressurized feeding device before a drying tower, characterized in that It includes a main material pipe, a premixing passage, a preheating pipe, and a main feeding pipe arranged according to the dye conveying direction. The main material pipe is used to connect with the source material of the dye. A auxiliary material pipe is connected to the premixing passage, and the auxiliary material pipe is used to connect with the auxiliary material source. An auxiliary heating pipe is arranged outside the preheating pipe, and a fluid with a temperature higher than that of the dye is filled in the auxiliary heating pipe. The main feeding pipe is used to connect with the atomizing nozzle of the drying tower, and a booster pump is arranged on the main feeding pipe.

2. The pressure boosting and feeding device before the drying tower according to claim 1, wherein A mixer connected in parallel with the premixing passage is arranged between the main material pipe and the preheating pipe. The mixer includes a liquid inlet pipe, an air chamber pipe, and a diffusion pipe that are hermetically connected in sequence according to the material flow direction. A nozzle with a tapered narrowing is arranged at one end of the liquid inlet pipe communicating with the air chamber pipe. A connecting pipe is arranged between the air chamber pipe and the premixing passage. The auxiliary material pipe is arranged in front of the incoming material of the connecting pipe. The connecting pipe and the premixing passage are connected through a second three-way valve, and the second three-way valve is an L-shaped three-way valve with alternative connection.

3. The pressure boosting and feeding device before the drying tower according to claim 2, characterized in that, The main material pipe is connected to the premixing passage and the mixer through a first three-way valve. The premixing passage and the mixer are connected to the preheating pipe through a fourth three-way valve. The first three-way valve includes two connection states, that is, the main material pipe is connected to the mixer and the premixing passage at the same time, or the main material pipe is connected to the premixing passage. The fourth three-way valve includes two connection states, that is, it is connected to the premixing passage or the mixer respectively.

4. The pressurized feeding device before the drying tower according to claim 1, characterized in that, The preheating pipe is a flat pipe extending vertically. The auxiliary heating pipe is of a U-shaped structure. The top end of the auxiliary heating pipe is provided with an arc-shaped 180-degree bend, so that the bottom end of the auxiliary heating pipe is respectively provided with an inlet and an outlet. A heat energy pipe and a return pipe are arranged below the auxiliary heating pipe. The heat energy pipe is used to connect with a heat energy-containing fluid source, and the fluid source comes from the waste heat recovery of the drying tower. The inlet is connected to the heat energy pipe, and the outlet is connected to the return pipe.

5. The pressure boosting and feeding device before a drying tower according to claim 4, wherein, A plurality of liquid outlet joints are arranged on the preheating pipe along its height direction. The liquid outlet joints are connected to the same collecting pipe through a fifth valve, and the collecting pipe is connected to the main feeding pipe. Multiple liquid outlet joints are alternatively opened.

6. The pressurized feeding device before the drying tower according to claim 5, characterized in that, A plurality of temperature sensors are installed in the preheating pipe along its height direction.

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