A sectional direct-injection heating and setting machine for polyester staple fibers

Abstract

The present invention relates to the technical field of polyester spinning, and particularly relates to a partitioned direct-injection heating and setting machine for polyester staple fibers. A partitioned direct-injection heating and setting machine for polyester staple fibers, the setting machine comprising a box body, a chain plate, a conveyor chain, a circulation fan and an air duct. The box body comprises a front two-zone and a rear four-zone. Among them, in the front two-zone, the hot air circulation direction is that the hot air blows from bottom to top; in the rear four-zone, the hot air circulation direction is that the hot air blows from top to bottom. The conveyor chain is longitudinally arranged in the box body, the chain plate is fixedly arranged on the conveyor chain, a plurality of corresponding air supply openings and air return openings are arranged on the box body, the air duct is connected to the air supply opening and the air return opening, and the circulation fan is arranged on the air duct. The air supply openings in the front two-zone are arranged at the upper part of the box body, and the air supply openings in the rear four-zone are arranged at the lower part of the box body. A gas direct-injection heating system is arranged on one side of the air supply opening inside the box body. The present invention improves the heat utilization rate of the oven and saves the consumption of natural gas.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester spinning, and particularly relates to a partitioned direct injection heating and setting machine for polyester staple fibers. Background Art

[0002] In the chemical fiber industry, especially in the post-spinning process of the staple fiber industry, the fibers after post-spinning drawing and crimping need to be heat-set in an oven to eliminate the internal stress of the fibers, improve the dimensional stability of the fibers, and further improve their physical and mechanical properties.

[0003] Such as Figure 1 and Figure 2 As shown, there is a prior heat transfer oil heat exchanger heating oven currently used by the applicant, including a box body 20, a chain plate 5, a conveyor chain 6, a circulation fan 16 and an air duct 18. The conveyor chain 6 is longitudinally arranged inside the box body 20, and the chain plate 5 is fixedly arranged on the conveyor chain 6. An air supply port 21 and a return air port 19 are arranged on the box body 20. The air duct 18 connects the air supply port 21 and the return air port 19, and the circulation fan 16 is arranged on the air duct 18. A guide plate 2 is arranged downstream of the return air port 19 of the box body 20, and a porous air distribution plate 3 is arranged downstream of the guide plate 2. The setting direction of the guide plate 2 makes the hot air directed to the porous air distribution plate 3, and a heat transfer oil heat exchanger 19 is arranged downstream of the porous air distribution plate 3. The heat transfer oil heat exchanger 19 is located upstream of the chain plate 5 of the box body 20. A filter screen 7 is arranged in the cavity of the box body 20, and the air supply port 21 is arranged downstream of the filter screen 7. One side of the air supply port 21 is connected to the cavity of the box body 20, and the other side is connected to the circulation fan 16. The heating device of this oven is the heat transfer oil heat exchanger 19. The principle is that the circulating air is directed to the porous air distribution plate 3 through the guide plate 2 and then heated through the heat transfer oil heat exchanger 19. That is to say, the circulating air is first evenly mixed and then becomes hot air after absorbing heat through the heating device and is blown onto the fibers on the chain plate 5. Such as Figure 5 As shown, the above-mentioned prior heat transfer oil heat exchanger heating oven system is divided into a front two-zone and a rear four-zone. Each four spans is a zone, and there are two circulation fans and four heat transfer oil heat exchangers in each zone. The front two zones are denoted as zones A1 and A2, and the rear four zones are denoted as zones B1, B2, B3 and B4. Among them, the oven structures of zones A1 and A2 are as shown in Figure 2 As shown, the hot air circulation direction is that the hot air blows from bottom to top to heat and dehumidify the fibers on the lower half of the chain plate. The oven structures of zones B1, B2, B3 and B4 are as shown in Figure 1 As shown, the hot air circulation direction is that the hot air blows from top to bottom to heat and dehumidify the fibers on the upper half of the chain plate.

[0004] Since the heating device adopted in the prior art is a heat-conducting oil heat exchanger, which uses the secondary heat transfer of heat-conducting oil to heat the circulating air. Originally, the heat-conducting oil needs to be heated by a natural gas boiler. When the natural gas boiler is operating, the heat ejected by the natural gas flame heats the heat-conducting oil heat exchanger. The hot air with residual heat is finally discharged, and this part that cannot be reused is a loss. Since the natural gas boiler has a thermal efficiency of only 90%, plus the heat loss in the pipeline during the flow of the heated heat-conducting oil, about 5% heat loss, plus the heat transfer efficiency of the two heat exchangers, the total loss rate reaches more than 15%. Summary of the Invention

[0005] In order to solve the above technical problems, the object of the present invention is to provide a polyester staple fiber sectional direct injection heating and setting machine. In the present invention, the setting machine adopts a gas direct injection heating method, directly mixing the flame heat of natural gas with the circulating air, without secondary heat transfer and waste of residual heat, greatly improving the heat utilization rate. In addition, the present invention heats the cold air first and then equalizes the air, mixing the generated hot air evenly, further ensuring the equal heat absorption of the fibers and the consistency of the product quality.

[0006] In order to achieve the above invention object, the present invention adopts the following technical solutions:

[0007] A polyester staple fiber sectional direct injection heating and setting machine, which includes a box body, a chain plate, a transmission chain, a circulating fan and an air duct. The box body includes a front two-zone and a rear four-zone. Among them, in the front two-zone, the hot air circulation direction is that the hot air blows from bottom to top; in the rear four-zone, the hot air circulation direction is that the hot air blows from top to bottom; the transmission chain is longitudinally arranged in the box body, the chain plate is fixedly arranged on the transmission chain, and a plurality of corresponding air supply ports and air return ports are arranged on the box body. The air duct connects the air supply port and the air return port, and the circulating fan is arranged on the air duct; the air supply ports in the front two-zone are arranged on the upper part of the box body, and the air supply ports in the rear four-zone are arranged on the lower part of the box body. A gas direct injection heating system is arranged on one side of the air supply port inside the box body. The gas direct injection heating system includes a heating pipe, a gas direct injection burner, an air equalizing block and an air equalizing static mixer. The heating pipe is horizontally arranged in the box body, one end of the heating pipe is connected to the air supply port, the other end of the heating pipe is provided with the gas direct injection burner, and there is an air inlet hole at the position of the gas direct injection burner in the heating pipe for connecting the inner cavity of the box body. The air equalizing block is arranged downstream of the gas direct injection burner in the heating pipe, and the air equalizing static mixer is arranged downstream of the air equalizing block in the heating pipe.

[0008] Preferably, a flow guide plate is arranged downstream of the air return port of the box body, and a porous air equalizing plate is arranged downstream of the flow guide plate. The setting direction of the flow guide plate guides the hot air to the porous air equalizing plate; a filter screen is arranged downstream of the chain plate inside the box body.

[0009] Preferably, an inner cylinder and an outer cylinder are arranged outside the gas direct injection burner. The inner cylinder is arranged outside the gas direct injection burner, and the outer cylinder is arranged outside the inner cylinder. Air inlet holes are uniformly arranged on the side walls of the inner cylinder and the outer cylinder.

[0010] Preferably, the oven further includes an explosion-proof door and a water spray pipe. The explosion-proof door is arranged outside the positive pressure area, where the positive pressure area is the area from the outlet of the circulation fan to the chain plate. The water spray pipe is arranged above the chain plate.

[0011] Preferably, the oven further includes a temperature sensor, which is arranged at the outlet of the circulation fan.

[0012] Preferably, the oven further includes a flame arrester, which is arranged at the connection between the end of the heating pipeline and the air supply port.

[0013] Preferably, the air distribution baffle is triangular, perpendicular to the air flow direction, and arranged in a cross pattern.

[0014] Preferably, the area from the chain plate to the suction port of the circulation fan is a slightly negative pressure area.

[0015] Preferably, two air supply ports are arranged in each of the first two zones and the last four zones. The two air supply ports are connected to a gas direct injection heating system through a tee joint.

[0016] The beneficial technical effects of adopting the present invention are as follows: Through the direct heating method of the natural gas burner, the flame heat of natural gas and the circulating air are directly and fully mixed, enabling 100% utilization of heat and greatly reducing the total loss rate. At the same time, the heated circulating air is further mixed through the air distribution device in the present invention, which not only makes the air flow direction and air volume of the circulating air basically consistent, but also makes the heat distribution of the circulating air balanced, thus ensuring the equal heat absorption of the fibers and the consistency of the product quality. Compared with the traditional oven with a heat transfer oil heat exchanger, when heating the same amount of fibers, the oven adopting the present invention can greatly save the consumption of natural gas. Description of the Drawings

[0017] Figure 1 Schematic diagram of the last four zones of the original heat transfer oil heating oven;

[0018] Figure 2 Schematic diagram of the first two zones of the original heat transfer oil heating oven;

[0019] Figure 3 Schematic diagram of the last four zones of the oven of the present invention;

[0020] Figure 4 Schematic diagram of the first two zones of the oven of the present invention;

[0021] Figure 5 Schematic diagram of the existing stenter;

[0022] Figure 6 It is a schematic structural diagram of a polyester staple fiber partition type direct injection heating and setting machine. Specific embodiments

[0023] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described, and then the invention will be further explained. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Given the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] As Figure 6 shown, a polyester staple fiber partition type direct injection heating and setting machine of the present invention is divided into the front two zones (zones A1 and A2) and the rear four zones (zones B1, B2, B3, and B4). Each four spans form a zone, and there is one burner and two circulating fans in each zone. After the burner equalizes the air, it is split into two and diverted into the two circulating fans. Among them, the oven structure in the rear four zones is as Figure 3 shown, and the hot air circulation direction is that the hot air blows from top to bottom to heat and dehumidify the fibers on the upper half of the chain plate; the oven structure in the front two zones is as Figure 4 shown, and the hot air circulation direction is that the hot air blows from bottom to top to heat and dehumidify the fibers on the lower half of the chain plate. The two structural principles are the same, only the positions of the gas direct injection heating systems are different. The front two zones (zones A1 and A2) and the rear four zones (zones B1, B2, B3, and B4) both adopt the oven described in the present invention. The gas direct injection heating system in the front two zones is arranged at the upper part of the box body 20, and the gas direct injection heating system in the rear four zones is arranged at the lower part of the box body 20.

[0025] As Figure 3 and Figure 4As shown in the figure, the stenter of the present invention includes a box body 20, a chain plate 5, a conveyor chain 6, a circulation fan 16 and an air duct 18. The conveyor chain 6 is longitudinally arranged in the box body 20, and the chain plate 5 is fixedly arranged on the conveyor chain 6. An air supply port 21 and an air return port 19 are arranged on the box body 20. The air duct 18 connects the air supply port 21 and the air return port 19, and the circulation fan 16 is arranged on the air duct 18. It is characterized in that a gas direct injection heating system is arranged on one side of the air supply port 21 inside the box body 20. The gas direct injection heating system includes a heating pipeline 14, a gas direct injection burner 11, an air distribution baffle 12 and an air distribution static mixer 13. The heating pipeline 14 is horizontally arranged in the box body 20. One end of the heating pipeline 14 is connected to the air supply port 21, and the other end of the heating pipeline 14 is provided with the gas direct injection burner 11. An air inlet hole 8 is provided at the position of the gas direct injection burner 11 on the heating pipeline 14 for communicating with the inner cavity of the box body 20. The air distribution baffle 12 is arranged downstream of the gas direct injection burner 11 in the heating pipeline 14, and the air distribution static mixer 13 is arranged downstream of the air distribution baffle 12 in the heating pipeline 14.

[0026] Wherein, a guide plate 2 is arranged downstream of the air return port 19 of the box body 20, and a porous air distribution plate 3 is arranged downstream of the guide plate 2. The arrangement direction of the guide plate 2 guides the hot air to the porous air distribution plate 3; a filter screen 7 is arranged downstream of the chain plate 5 in the box body 20. An inner cylinder 10 and an outer cylinder 9 are arranged outside the gas direct injection burner 11. The inner cylinder 10 is arranged outside the gas direct injection burner 11, and the outer cylinder 9 is arranged outside the inner cylinder 10. Air inlet holes 8 are uniformly arranged on the side walls of the inner cylinder 10 and the outer cylinder 9.

[0027] The oven of the present invention further includes an explosion-proof door 1, a water spray pipe 4, a fire arrester 15 and a temperature sensor 17; the explosion-proof door 1 is arranged outside the positive pressure area to prevent accidents caused by excessive pressure; the water spray pipe 4 is arranged above the chain plate 5 for emergency fire extinguishing to prevent fiber from catching fire; the fire arrester 15 is arranged at the connection between the end of the heating pipeline 14 and the air supply port 21 for filtering residues; the temperature sensor 17 is arranged at the outlet of the circulation fan 16, and feeds back the temperature to the controller to control the natural gas intake of the combustion fan; wherein, the positive pressure area is the area from the outlet of the circulation fan 16 to the chain plate 5, and the area from the chain plate 5 to the suction port of the circulation fan 16 is a slightly negative pressure area. The air distribution baffle 12 in the air distribution device is triangular, perpendicular to the air flow direction, and arranged in a cross arrangement. The chain plate 5 is a porous plate and is conveyed in one direction through the conveyor chain 6.

[0028] Through the data analysis in Table 1, since the stenter of the present invention uses gas direct injection heating and there is no secondary heat transfer of heat-conducting oil, the flame heat of natural gas is directly mixed with the circulating air, and the heat utilization rate is 100%. Originally, on average, 54m 3 was required for the oven heating per ton of fiber, and now after modification, on average, only 46m 3Natural gas, saving 20% of natural gas compared to the original.

[0029] Table 1

[0030]

[0031] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polyester staple fiber sectional direct injection heat setting machine, which comprises a box body (20), a chain plate (5), a conveyor chain (6), a circulating fan (16) and an air duct (18). The box body (20) comprises a front two-zone area (A1, A2) and a rear four-zone area (B1, B2, B3, B4). In the front two-zone area, the hot air circulation direction is that the hot air blows from bottom to top; in the rear four-zone area, the hot air circulation direction is that the hot air blows from top to bottom. The conveyor chain (6) is longitudinally arranged in the box body (20), the chain plate (5) is fixedly arranged on the conveyor chain (6), a plurality of corresponding air supply openings (21) and air return openings (19) are arranged on the box body (20), the air duct (18) connects the air supply openings (21) and the air return openings (19), and the circulating fan (16) is arranged on the air duct (18). Among them, The positive pressure area is the area from the outlet of the circulation fan (16) to the chain plate (5), and the area from the chain plate (5) to the suction port of the circulation fan (16) is a slightly negative pressure area; characterized in that the air supply openings (21) in the first two areas are arranged at the upper part of the box body (20), and the air supply openings (21) in the latter four areas are arranged at the lower part of the box body (20). A gas direct injection heating system is arranged on one side of the air supply opening (21) inside the box body (20). The gas direct injection heating system includes a heating pipeline (14), a gas direct injection burner (11), an air distribution baffle (12) and an air distribution static mixer (13). The heating pipeline (14) is horizontally arranged inside the box body (20). One end of the heating pipeline (14) is connected to the air supply opening (21), and the other end of the heating pipeline (14) is provided with the gas direct injection burner (11). An air inlet hole (8) is arranged at the position of the gas direct injection burner (11) in the heating pipeline (14) for communicating with the inner cavity of the box body (20). The air distribution baffle (12) is arranged downstream of the gas direct injection burner (11) in the heating pipeline (14), and the air distribution static mixer (13) is arranged downstream of the air distribution baffle (12) in the heating pipeline (14). A flow guide plate (2) is arranged downstream of the air return opening (19) of the box body (20), and a porous air distribution plate (3) is arranged downstream of the flow guide plate (2). The arrangement direction of the flow guide plate (2) guides the hot air to the porous air distribution plate (3); A filter net (7) is arranged downstream of the chain plate (5) inside the box body (20). An inner cylinder (10) and an outer cylinder (9) are arranged outside the gas direct injection burner (11). The inner cylinder (10) is arranged outside the gas direct injection burner (11), and the outer cylinder (9) is arranged outside the inner cylinder (10). Air inlet holes (8) are evenly arranged on the side walls of the inner cylinder (10) and the outer cylinder (9).

2. The polyester staple fiber sectional direct injection heat setting machine according to claim 1, characterized in that, The box body (20) further includes an explosion-proof door (1) and a water spray pipe (4). The explosion-proof door (1) is arranged outside the positive pressure area; The water spray pipe (4) is arranged above the chain plate (5).

3. The polyester staple fiber partition type direct injection heat setting machine according to claim 1, wherein, The box body (20) further includes a temperature sensor (17). The temperature sensor (17) is arranged at the outlet of the circulation fan (16).

4. A polyester staple fiber sectional direct injection heat setting machine according to claim 1, characterized in that, The box body (20) further includes a fire arrester (15). The fire arrester (15) is arranged at the connection between the end of the heating pipeline (14) and the air supply opening (21).

5. A polyester staple fiber sectional direct injection heat setting machine according to claim 1, characterized in that, The air distribution baffle (12) is triangular in shape, perpendicular to the air flow direction, and arranged in a crosswise manner.

6. The polyester staple fiber sectional direct injection heat setting machine according to claim 1, characterized in that, Two air supply openings (21) are arranged in each of the first two areas (A1, A2) and the latter four areas (B1, B2, B3, B4). The two air supply openings (21) are connected to a gas direct injection heating system through a tee joint.

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