Cellulose temperature adjusting system

Abstract

The utility model discloses a cellulose temperature adjusting system, which belongs to the technical field of viscose fiber production and comprises a first adjusting system arranged at the feeding front end of an aging drum and used for adjusting the feeding temperature and a second adjusting system arranged at the discharging end of the aging drum and used for adjusting the yellowing initial temperature. The first adjusting system comprises a closed conveying device for conveying materials and a blowback cooling device connected with the closed conveying device, and the second adjusting system comprises an alkali cellulose cooler, a material temperature detection device arranged at an outlet of the cooler and an air supply system which is interlocked with the material temperature detection device to control the air supply temperature. The temperature adjusting system disclosed by the utility model can be used for quickly and effectively adjusting the temperature of the alkali cellulose and effectively avoiding the problems of aging drum and weathered alkali cellulose on the wall of the conveying air pipe caused by mismatching of the air temperature and the temperature of the alkali cellulose.

Description

Technical Field

[0001] This utility model relates to the field of viscose fiber production, specifically to a cellulose temperature control system. Background Technology

[0002] In the preparation of viscose fiber, a temperature control system is essential for controlling the viscosity of cellulose to adjust the product's strength. The most common pneumatic conveying system at the inlet and outlet of the curing drum is a temperature regulation system. However, during temperature regulation in this system, the alkali cellulose is heated or cooled. The air inside the curing drum undergoes heat exchange. Cold air entering the curing drum, due to the higher temperature inside, condenses, eventually adhering to the drum wall and forming weathered alkali fibers. Simultaneously, due to the process requirements for the initial curing temperature, only low-temperature pneumatic conveying is possible. Since the power source for the alkali fiber conveying pipeline is a Roots blower, weathered alkali cellulose also forms on the pipeline, affecting curing quality and wasting alkali cellulose. Therefore, the technical transformation of the pneumatic conveying system is a crucial issue for viscose production enterprises.

[0003] Currently, most viscose preparation companies use a pneumatic conveying system that employs inlet induced draft and outlet forced draft from an aging drum, along with low-temperature conveying of alkali cellulose to regulate its viscosity and temperature. However, this system can lead to problems such as excessive air volume, excessive air pressure, excessively high air temperature, and air-temperature mismatch, resulting in excessively high material temperature. This, in turn, causes excessively high initial xanthation temperature and the generation of a large amount of weathered alkali cellulose within the aging drum, ultimately affecting xanthation quality and viscose quality.

[0004] In the prior art, patent CN203295887U discloses a temperature control system for an aging drum, including a surface cooler and a fan. The feed end of the aging drum is an inlet chute, and the fan is connected to the inlet chute of the aging drum through an air duct. The surface cooler is installed on the air duct. This patent uses water cooling to cool the alkali cellulose before it enters the aging drum, which not only has low cooling efficiency but also fails to control the initial xanthation temperature of the material after aging. Utility Model Content

[0005] This invention aims to solve a series of problems in the design of the aging drum air-cooling system during viscose staple fiber production. It proposes a cellulose temperature regulation system that can quickly and effectively regulate the temperature of alkali cellulose, effectively avoiding the problem of weathered alkali cellulose forming on the walls of the aging drum and conveying air duct due to the mismatch between air temperature and alkali cellulose temperature.

[0006] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0007] A cellulose temperature control system includes a first control system installed at the front end of the aging drum for adjusting the feed temperature and a second control system installed at the discharge end of the aging drum for adjusting the initial xanthation temperature. The first control system includes a sealed conveying device for transporting materials and a backflushing cooling device connected thereto. The second control system includes an alkali cellulose cooler, a material temperature detection device installed at the cooler outlet, and an air supply system that is interlocked with the material temperature detection device to control the air supply temperature.

[0008] Furthermore, the backflushing cooling device includes a cooling fan connected to the closed conveying equipment for backflushing and cooling the material continuously conveyed therein, and an exhaust fan for discharging hot air from inside the closed conveying equipment.

[0009] Furthermore, the alkali cellulose cooler is connected to the discharge port of the aging drum, and both the inlet and outlet ends of the alkali cellulose cooler are equipped with screw conveyors for material transport.

[0010] Furthermore, the alkali cellulose cooler is equipped with a blower at the bottom and an external ambient air delivery pipeline at the top, which cools the material through circulating air.

[0011] Furthermore, the alkali cellulose cooler is connected to a cooling water circulation pipe for heat exchange with the circulating air inside the cooler.

[0012] Furthermore, the air supply system includes a feeding fan and a surface cooler connected to the air outlet of the feeding fan. The surface cooler is interlocked with the material temperature detection device to control the feeding air temperature to maintain consistency with the alkali cellulose discharge temperature.

[0013] Furthermore, the surface cooler is connected to a cooling water circulation pipe for heat exchange with the outlet air temperature of the feeding blower.

[0014] Furthermore, the enclosed conveying equipment adopts a fully sealed material conveying belt, which is equipped with a belt scale for real-time detection of material weight. The belt scale is connected to the cooling fan and exhaust fan to dynamically adjust the air volume according to the material weight.

[0015] The working principle and process of this utility model are as follows:

[0016] The material is fed from the press into the enclosed conveyor. During the continuous transport of the material, the cooling fan blows back the material in the enclosed conveyor to loosen and cool it down. At the same time, the exhaust fan discharges the hot air emitted by the material to prevent the heat exchange between the inside of the aging drum and the outside environment, which would lead to condensation and cause weathering of alkali cellulose.

[0017] After cooling, the material is conveyed by a screw conveyor into the aging drum for aging, and then enters the alkali cellulose cooler. The temperature is regulated by circulating air until the alkali cellulose temperature is adjusted to the optimal temperature required for the xanthation process before being output.

[0018] The cooled material is conveyed to the next stage by a feeding fan. The feeding fan is interlocked with the surface cooler through a material temperature detection device to regulate the air temperature to be consistent with the temperature of alkali cellulose at the cooler outlet. This effectively reduces the heat exchange between the air and the material, thereby reducing the generation of condensate and preventing the formation of weathered alkali cellulose.

[0019] In summary, this utility model has the following advantages:

[0020] 1. The temperature regulation system of this utility model can quickly and effectively regulate the temperature of alkali cellulose, avoiding the problem of weathered alkali cellulose on the walls of the aging drum and conveying air duct due to the mismatch between the air temperature and the alkali cellulose temperature.

[0021] 2. In this utility model, a closed conveying equipment is used for material transfer. A cooling fan is used to back-blown and cool the continuously conveyed material. Combined with an exhaust fan, the hot air inside the alkali cellulose in the closed conveying equipment is removed. This reduces the amount of hot air entering the aging drum and avoids the problem of condensation caused by heat exchange with the outside environment, which leads to weathered alkali cellulose inside the aging drum.

[0022] 3. In this utility model, the closed transmission equipment adopts a material conveying belt, which is equipped with a belt scale for real-time detection of material weight. The belt scale is connected to the cooling fan and the exhaust fan by signal. The air volume of the cooling fan and the exhaust fan can be dynamically adjusted according to the material weight displayed by the belt scale.

[0023] 4. In this utility model, the alkali cellulose cooler uses circulating air to cool the alkali cellulose, causing it to boil inside the cooler. This allows the alkali cellulose temperature to be adjusted to the optimal temperature required for the xanthation process, effectively stabilizing the initial xanthation temperature, improving xanthation quality, and reducing quality fluctuations.

[0024] 5. In this utility model, the feeding blower achieves the same air temperature as the alkali cellulose cooler through the feeding blower surface cooler, which can effectively reduce the heat exchange between the air and alkali cellulose, reduce the generation of condensate, and avoid the generation of weathered alkali cellulose. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the temperature control system of this utility model;

[0026] In the picture:

[0027] 1. Aging drum; 2. Cooling fan; 3. Exhaust fan; 4. Enclosed conveying equipment; 5. Alkali cellulose cooler; 6. Screw conveyor; 7. Feeding fan; 8. Surface cooler; 9. Blower; 10. Ambient air conveying pipeline; 11. Cooling water circulation pipeline; 12. Discharge conveying pipeline; 13. Material temperature detection device. Detailed Implementation

[0028] To more clearly illustrate this utility model, the following description, in conjunction with preferred embodiments and accompanying drawings, further clarifies the present invention. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this utility model.

[0029] Example 1

[0030] As the most basic embodiment of this utility model, this embodiment provides a cellulose temperature regulation system, such as... Figure 1 As shown, it includes a first regulating system installed at the front end of the aging drum 1 to regulate the feed temperature and a second regulating system installed at the discharge end of the aging drum 1 to regulate the initial yellowing temperature. The first regulating system includes a closed conveying device 4 for conveying materials and a back-flushing cooling device connected thereto. The second regulating system includes an alkali cellulose cooler 5, a material temperature detection device 13 installed at the outlet of the cooler, and an air supply system that is interlocked with the material temperature detection device 13 to control the air supply temperature.

[0031] In this invention, the temperature of alkali cellulose at the front end of the feeding section of the aging drum 1 and the front end of the yellowing section can be effectively adjusted through the first and second adjustment systems, avoiding the problem of weathered alkali cellulose being generated on the walls of the aging drum 1 and the conveying air duct due to the mismatch between the air temperature and the alkali cellulose temperature.

[0032] Example 2

[0033] As a preferred embodiment of this utility model, this utility model provides a cellulose temperature regulation system, such as... Figure 1 As shown, it includes a first regulating system installed at the front end of the aging drum 1 to regulate the feed temperature and a second regulating system installed at the discharge end of the aging drum 1 to regulate the initial yellowing temperature.

[0034] It should be noted that the aging drum 1 is an existing piece of equipment used in the aging process of viscose staple fiber production. It is used to adjust the degree of polymerization of materials, and the residence time of materials in the aging drum 1 can be adjusted according to the outlet gate of the aging drum 1.

[0035] The first regulating system includes a closed conveying device 4 for conveying materials and a backflushing cooling device connected thereto. Specifically, in this embodiment, the backflushing cooling device includes a cooling fan 2 connected to the closed conveying device 4 and used to backflush and cool the materials continuously conveyed therein, and an exhaust fan 3 for discharging hot air from inside the closed conveying device 4.

[0036] Preferably, the enclosed conveying device 4 uses a fully sealed material conveying belt, which is equipped with a belt scale for real-time detection of material weight. The belt scale is connected to the cooling fan 2 and the exhaust fan 3 to dynamically adjust the air volume according to the material weight.

[0037] The exhaust fan 3 can guide the airflow of the cooling fan 2 and quickly exhaust the hot air of alkali cellulose in the sealed conveying equipment 4. The frequency of the exhaust fan 3 (i.e., full-frequency operation) must be greater than the frequency of the cooling fan 2.

[0038] In this embodiment, a cooling fan 2 is used to blow air back onto the feeding belt, which can loosen the material and achieve rapid cooling. Since the material carries a lot of heat as it goes from the press to the material conveyor belt, the exhaust fan 3 can remove the hot air. Both the exhaust fan 3 and the cooling fan 2 in this invention are preferably variable frequency fans, and both can adjust the airflow according to the material weight displayed on the belt scale.

[0039] In this embodiment, the cellulose temperature control system uses a closed conveying device 4 for material transfer. The cooling fan 2 is used to back-blown and cool the continuously conveyed material. Combined with the exhaust fan 3 to remove the hot air from the alkali cellulose in the closed conveying device 4, the hot air can be reduced from entering the aging drum 1, thus avoiding the problem of condensation caused by the exchange of heat and cold with the outside environment, which could lead to the formation of weathered alkali cellulose in the aging drum 1.

[0040] Example 3

[0041] As a preferred embodiment of this utility model, this utility model provides a cellulose temperature regulation system, such as... Figure 1 As shown, it includes a first regulating system installed at the front end of the aging drum 1 to regulate the feed temperature and a second regulating system installed at the discharge end of the aging drum 1 to regulate the initial yellowing temperature. The first regulating system includes a closed conveying device 4 for conveying materials and a back-flushing cooling device connected thereto. The second regulating system includes an alkali cellulose cooler 5, a material temperature detection device 13 installed at the outlet of the cooler, and an air supply system that is interlocked with the material temperature detection device 13 to control the air supply temperature.

[0042] The first regulating system includes a closed conveying device 4 for transporting materials and a backflushing cooling device connected thereto. Specifically, in this embodiment, the backflushing cooling device includes a cooling fan 2 connected to the closed conveying device 4 for backflushing and cooling the materials continuously transported therein, and an exhaust fan 3 for exhausting hot air from inside the closed conveying device 4.

[0043] Preferably, the enclosed conveying device 4 uses a fully sealed material conveying belt, which is equipped with a belt scale for real-time detection of material weight. The belt scale is connected to the cooling fan 2 and the exhaust fan 3 to dynamically adjust the air volume according to the material weight.

[0044] The exhaust fan 3 can guide the airflow of the cooling fan 2 to quickly expel the hot air from the alkali cellulose inside the sealed conveying equipment 4. The frequency of the exhaust fan 3 (i.e., full-frequency operation) must be greater than the frequency of the cooling fan 2.

[0045] In this embodiment, a cooling fan 2 is used to blow air back onto the feeding belt, which can loosen the material and achieve rapid cooling. Since the material carries a lot of heat as it goes from the press to the material conveyor belt, the exhaust fan 3 can remove the hot air. Both the exhaust fan 3 and the cooling fan 2 in this invention are preferably variable frequency fans, and both can adjust the airflow according to the material weight displayed on the belt scale.

[0046] The second adjustment system is mainly used to further adjust the material temperature, stabilize the feed temperature of the xanthation section, and thus stabilize the xanthation process.

[0047] The alkali cellulose cooler 5 is connected to the discharge port of the aging drum 1, and both the inlet and outlet ends of the alkali cellulose cooler 5 are equipped with screw conveyors 6 for material transfer.

[0048] In this embodiment, the alkali cellulose cooler 5 is equipped with a blower 9 at the bottom and an ambient air delivery pipeline 10 at the top. The alkali cellulose is cooled by circulating air. At the same time, a cooling water circulation pipeline 11 is provided to exchange heat with the circulating air in the cooler. The alkali cellulose cooler 5 is equipped with a material temperature detection device 13 at the outlet.

[0049] In this embodiment, the air supply system includes a feeding blower 7 and a surface cooler 8 connected to the outlet end of the feeding blower 7. The feeding blower 7 is connected to the discharge conveying pipeline 12 of the alkali cellulose cooler 5, serving as the power source for conveying the material. In this embodiment, the outlet end of the feeding blower 7 is connected to the surface cooler 8, which is connected to a cooling water circulation pipe 11 for heat exchange with the outlet air temperature of the feeding blower 7. By interlocking the surface cooler 8 with the material temperature detection device 13, the conveying power temperature can be adjusted to match the outlet temperature of the alkali cellulose cooler 5, thereby reducing the generation of weathered fibers on the conveying duct wall. Preferably, the feeding blower 7 is a Roots blower.

[0050] In this embodiment, the design of the alkali cellulose cooler 5 can better stabilize the temperature of alkali cellulose before the xanthation stage, playing a key role in controlling the initial xanthation temperature, improving xanthation quality, and reducing quality fluctuations. Simultaneously, through the interlocking control of the feed fan 7, the surface cooler 8, and the material temperature detection device 13, the temperature of the conveying power can be adjusted to match the alkali cellulose outlet temperature of the cooler, thereby preventing the generation of weathered alkali cellulose in the conveying air duct.

[0051] The working principle of this utility model is as follows:

[0052] The material is fed from the press onto the enclosed material conveyor belt. During the continuous transport of the material, the cooling fan 2 blows back the material to loosen and cool it down. The exhaust fan 3 exhausts the hot air emitted by the alkali cellulose. During the cooling process, the exhaust fan 3 and the cooling fan 2 dynamically adjust the air volume according to the material weight detected in real time by the belt scale.

[0053] The cooled material is conveyed by screw conveyor 6 into aging drum 1 for aging, and then output from the outlet of aging drum 1. It is then conveyed by screw conveyor 6 to alkali cellulose cooler 5, where it is cooled by circulating air. The cooled material is then conveyed to the next stage by feeding fan 7, which controls the air temperature to 28°C through surface cooler 8, keeping it consistent with the temperature of alkali cellulose at the cooler outlet. This effectively reduces the heat exchange between the air and alkali cellulose, thereby reducing the generation of condensate and preventing the formation of weathered alkali cellulose.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A cellulose temperature control system, characterized in that, It includes a first regulating system set at the front end of the aging drum (1) for regulating the feed temperature and a second regulating system set at the discharge end of the aging drum (1) for regulating the initial yellowing temperature. The first regulating system includes a closed conveying device (4) for conveying materials and a back-blowing cooling device connected thereto. The second regulating system includes an alkali cellulose cooler (5), a material temperature detection device (13) set at the outlet of the cooler, and an air supply system that controls the air supply temperature in conjunction with the material temperature detection device (13).

2. The cellulose temperature control system as described in claim 1, characterized in that, The backflush cooling device includes a cooling fan (2) connected to the closed conveying device (4) and used to backflush and cool the material continuously conveyed therein, and an exhaust fan (3) used to exhaust the hot air inside the closed conveying device (4).

3. The cellulose temperature control system as described in claim 1, characterized in that, The alkali cellulose cooler (5) is connected to the discharge port of the aging drum (1), and both the feed end and discharge end of the alkali cellulose cooler (5) are equipped with screw conveyors (6) for material transfer.

4. The cellulose temperature control system as described in claim 1, characterized in that, The alkali cellulose cooler (5) is equipped with a blower (9) at the bottom and an external ambient air delivery pipeline (10) at the top, which cools the material through circulating air.

5. A cellulose temperature control system as described in claim 4, characterized in that, The alkali cellulose cooler (5) is connected to a cooling water circulation pipe (11) for heat exchange with the circulating air inside the cooler.

6. The cellulose temperature control system as described in claim 1, characterized in that, The air supply system includes a feeding fan (7) and a surface cooler (8) connected to the air outlet of the feeding fan (7). The surface cooler (8) is interlocked with the material temperature detection device (13) to control the feeding air temperature to keep it consistent with the alkali cellulose discharge temperature.

7. A cellulose temperature control system as described in claim 6, characterized in that, The surface cooler (8) is connected to a cooling water circulation pipe (11) for heat exchange with the outlet air temperature of the feed blower (7).

8. A cellulose temperature control system as described in claim 2, characterized in that, The enclosed conveying equipment (4) adopts a fully sealed material conveying belt. The material conveying belt is equipped with a belt scale for real-time detection of material weight. The belt scale is connected to the cooling fan (2) and the exhaust fan (3) so that the air volume can be dynamically adjusted according to the material weight.

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