CN111560788B - Drying system for paper production and drying method thereof - Google Patents
Drying system for paper production and drying method thereof Download PDFInfo
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- CN111560788B CN111560788B CN202010411575.8A CN202010411575A CN111560788B CN 111560788 B CN111560788 B CN 111560788B CN 202010411575 A CN202010411575 A CN 202010411575A CN 111560788 B CN111560788 B CN 111560788B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/20—Waste heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention relates to a drying system for paper production and a drying method thereof, wherein the drying system comprises a drying cylinder through which wet paper passes, at least two air hoods arranged at the periphery of the drying cylinder, heating devices corresponding to the air hoods and an air supply system communicated between the heating devices and the air hoods, and is characterized in that: the waste heat recovery system is used for recovering hot air in each air hood and returning the hot air to the heating device; the invention has the beneficial effects that: can carry out waste heat recovery to hot-blast, guarantee the utilization ratio of resource, moreover, utilize the air feed system can also further improve drying effect and the drying efficiency to wet paper page or leaf.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a drying system for paper production and a drying method thereof.
Background
In the paper industry, drying devices (e.g., drying cylinders) are typically provided, which are mainly used to dry the wet paper sheet formed by the forming section, thereby obtaining a paper sheet with a low moisture content.
The existing drying device mainly comprises a drying cylinder and an air hood, wherein in the drying process, high-temperature and high-pressure steam (or hot air) can be input into the drying cylinder and the air hood to dry wet paper sheets passing through the drying cylinder, the moisture on the wet paper sheets is evaporated by mainly utilizing the heat of the high-temperature steam in the drying cylinder, the wet paper sheets are impacted by utilizing the high-temperature hot air of the air hood, the evaporated moisture is taken away while the paper sheets are dried, then the high-temperature hot air still has higher waste heat after the moisture of the paper sheets is taken away, and the hot air is directly discharged outwards at present, so that the great waste of energy is caused;
in addition, at present, the impact effect of hot air entering the air hood on paper is poor (for example, the impact coverage is narrow or the impact force is insufficient), and the drying effect on the paper is easily influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a drying system for paper production and a drying method thereof, and aims to solve the problems in the background technology.
The technical scheme of the invention is realized as follows: the utility model provides a drying system for paper production, includes the dryer that the confession wet paper page or leaf passed through, at least two locate the outlying gas hood of dryer, with each gas hood heating device that corresponds and communicate the air feed system between each heating device and each gas hood, its characterized in that: comprises a waste heat recovery system used for recovering hot air in each air hood and returning the hot air to the heating device.
Preferably: the waste heat recovery system comprises exhaust pipes communicated with the gas hoods, a first gas source device with an input end and an output end, wherein the input end is communicated with the exhaust pipes, a control valve which is communicated with the first gas source device through a first gas pipe and is provided with an input end and a plurality of output ends, and a plurality of second gas pipes which are connected between the output ends of the control valve and the heating devices.
Preferably: the air supply system comprises a second air source device which is communicated with the output end of the heating device through a third air pipe and is provided with an input end and an output end, a fourth air pipe which is communicated with the output end of the second air source device, a node formed at the output end of the fourth air pipe, and a plurality of fifth air pipes which are connected with the node in series and are used for supplying air to the interior of each air hood.
Preferably: the air guide device is arranged in each air hood; the air guiding device comprises at least one air guiding cover which is connected with the inner wall of the air hood through a rotating shaft and is provided with the air inlet and the air outlet, and an impeller which is arranged in the air guiding cover and generates axial airflow from the air inlet to the air outlet when in operation, wherein the air inlet is communicated with the fifth air pipe; the air guide cover consists of a guide frame, an inner frame and a tail frame which are sequentially connected, a guide body is arranged at the center of the guide frame, the caliber of the guide frame is gradually reduced from the flowing direction of axial airflow, a plurality of separation blades connected with the guide frame are arranged on the periphery of the guide body, and the guide body consists of a first component with the diameter gradually increased from the flowing direction of the axial airflow and a second component with the diameter gradually reduced from the flowing direction of the axial airflow; the air outlet is formed between the adjacent separating blades.
Preferably: the tail frame comprises a tail frame body, and a plurality of air holes which are arranged in a concentric circle and form the air inlet are formed in the tail frame body.
Preferably: the air guide device is used for guiding the air to swing in the air hood; the driving device comprises a first guide rail and a second guide rail which are arranged on the air hood at intervals, a first sliding block and a second sliding block which are connected with the first guide rail in a sliding way, an engaging part which is driven by the first sliding block or the second sliding block and can drive the rotating shaft to rotate, and a driving part which is used for driving the first sliding block and the second sliding block to move simultaneously; the meshing part comprises first racks respectively arranged on the first sliding block and the second sliding block and first gears which are arranged on the air hoods, connected with the rotating shafts and meshed with the first racks.
Preferably: the driving part comprises an air cylinder used for driving the first sliding block to move, a second rack which is movably arranged on the second guide rail and connected with the first sliding block, a second gear which is rotatably connected with the air hood and meshed with the second rack, and a third rack which is arranged on the second sliding block and meshed with the second gear.
Preferably: the control system is used for controlling the second air source device and the air cylinder; the control system comprises a first controller for controlling the air cylinder, a second controller for controlling the second air source device and a central control unit for sending an actuating electric signal to the first controller or the second controller; wherein a communication interface between the first controller and the second controller is configured in a coupled mode; in the connection mode, the first controller operates the air cylinder based on the electric signal sent by the central control unit, and simultaneously sends the electric signal to the second controller, and the second controller operates the second air source device based on the electric signal.
In addition, the invention also provides a drying method for paper production, which uses the drying system and is characterized by comprising the following steps:
s1: providing pulp and forming a wet sheet of paper;
s2: transferring and attaching the wet paper to the surface of a drying cylinder;
s3: conveying hot air into each air hood by using an air supply system, impacting and drying the wet paper and generating damp and hot air;
s4: starting the first air source device, extracting hot and humid air in each air hood, and selecting the hot and humid air from the heating devices corresponding to the air hoods for heating;
s5: the hot air output from the heating device is continuously fed into each air hood through the air supply system, and a heating process of circularly supplying air to the air hoods is formed in step S4.
Preferably: the method also comprises a wind guiding method which is carried out simultaneously with the step S3, and the wind guiding method comprises the following steps:
a1: the central control unit sends an electric signal to the first controller, the first controller controls the operation of the air cylinder based on the electric signal, and simultaneously sends an electric signal to the second controller, so that the second controller operates the second air source device based on the electric signal of the first controller;
a2: the second air source device sends the gas exhausted from the heating device into the air guide covers in the air covers, meanwhile, the air cylinder drives the first sliding block and the second sliding block to move relatively, and simultaneously drives the air guide covers in the air covers to swing in the air covers, so that hot air is guided to the surface of the wet paper sheet, and the wet paper sheet is dried;
a3: the air guide cover converges hot air entering the air guide cover, and sprays out to wet paper sheets from each air outlet, so that the drying of the wet paper sheets is accelerated by improving the impact force of the hot air on the wet paper sheets.
The invention has the beneficial effects that:
firstly, after hot air enters each air hood and dries the wet paper, the waste heat recovery system is started, namely: the first air source device is started, and hot air (containing steam) in the air hood is pumped out and sent into each heating device for reutilization, so that the utilization rate of resources is improved;
secondly, based on the first point, the invention can also selectively return hot air with residual heat to the heating device corresponding to each air hood by adjusting the opening channel of the control valve, and the purpose is as follows: in the process of drying the wet paper pages, if pipelines for supplying gas to each heating device are blocked (or have faults), hot air exhausted from each air cover can be uniformly converged into the heating device by adjusting the control valve, so that the heating device can perform normal air on the corresponding air cover, and the drying efficiency and the drying effect of the wet paper pages are ensured; if the pipeline is not blocked, the gas discharged from each gas hood can respectively return to each heating device, so that the reasonable application of hot air can be improved, and the utilization rate of resources is further improved;
thirdly, when the hot air is fed into the air hood, the air guide device is arranged in the air hood, one end of the air guide hood of the air guide device is provided with a necking, the air guide device can collect the hot air and guide the hot air by using the guide body, and the impact force of the hot air blowing to wet paper sheets can be improved, so that the drying effect and the drying efficiency of the paper sheets are improved;
fourthly, based on the third point, the driving device can drive the air guide device to swing in each air hood, so that the coverage area of hot air blowing to wet paper sheets can be increased, and the drying effect on the paper sheets is further improved;
fifthly, the control system can control the driving device and the air supply system to synchronously operate, the air guide device swings at the same time in the air guide process, the operation consistency of two actions is kept, the drying effect of paper is further guaranteed, and resource waste is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is a schematic structural diagram of a flow guiding device according to embodiment 2 of the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 6 is an enlarged view of the portion C of FIG. 2;
FIG. 7 is a schematic structural diagram of another embodiment of the present invention in embodiment 2;
fig. 8 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the present invention discloses a drying system for paper production, which comprises a drying cylinder 11 through which a wet paper 10 passes, at least two air hoods disposed at the periphery of the drying cylinder 11, a heating device corresponding to each air hood, and an air supply system 20 communicating each heating device and each air hood.
In an embodiment of the present invention, the gas masks may be two, and are divided into a first gas mask 121 and a second gas mask 122.
In an embodiment of the present invention, there may be two heating devices, which are a first heating device 131 corresponding to the first gas hood 121 and a second heating device 132 corresponding to the second gas hood 122.
In the embodiment of the present invention, the waste heat recovery system includes an exhaust pipe 30 communicated with each gas hood, a first gas source device 31 having an input end and an output end and the input end being communicated with each exhaust pipe 30, a control valve 33 communicated with the first gas source device 31 through a first gas pipe 32 and having an input end and a plurality of output ends, and a plurality of second gas pipes 34 connected between each output end of the control valve 33 and each heating device.
In an embodiment of the present invention, the first air source 31 may be an air pump.
In a specific embodiment of the present invention, the heating device may be a heater.
In the embodiment of the present invention, an intake duct 14 for supplying air to each heater is further included.
In the embodiment of the present invention, the air supply system 20 is an air supply pipe communicating between each heating device and each air hood.
The principle of the embodiment is as follows:
referring to fig. 1, each air inlet pipe provides air for drying wet paper sheets to the first heating device and the second heating device, the air is fed into each air hood through the air supply pipe after being heated by the first heating device and the second heating device to dry the wet paper sheets on the drying cylinder, and when the wet paper sheets pass through hot air, steam is generated in the air hoods, and at the moment, the steam and the waste heat air in each air hood can be extracted by the air pump and selectively fed into the first heating device and/or the second heating device, so that the waste heat of the waste heat air is recycled, and the utilization rate of resources is improved.
Example 2, the difference from example 1 is that:
as shown in fig. 2-7, in the embodiment of the present invention, the air supply system 20 includes a second air supply device 22 having an input end and an output end and communicating with the output end of the heating device through a third air pipe 21, a fourth air pipe 23 communicating with the output end of the second air supply device 22, a node 24 formed at the output end of the fourth air pipe 23, and a plurality of fifth air pipes 25 connected in series with the node 24 and used for supplying air to the interior of each air hood.
In an embodiment of the present invention, the second air supply device 22 may be an air pump.
In the specific embodiment of the invention, the air guide device also comprises an air guide device 3 arranged in each air hood; the air guiding device 3 comprises at least one air guiding cover 3000 which is connected with the inner wall of the air hood through a rotating shaft 310 and is provided with the air inlet 30a and the air outlet 30b, and an impeller 320 which is arranged inside the air guiding cover 3000 and generates axial airflow from the air inlet 30a to the air outlet 30b when in operation, wherein the air inlet 30a is communicated with the fifth air pipe 25; the air guide cover 3000 comprises a guide frame 300, an inner frame 301 and a tail frame 302 which are sequentially connected, a guide body 303 is arranged at the center of the guide frame 300, the caliber L1 of the guide frame 300 is gradually reduced from the flowing direction of axial airflow, a plurality of separation blades 304 connected with the guide frame 300 are arranged on the periphery of the guide body 303, and the guide body 303 comprises a first sub-body 3031 with the diameter Q1 gradually increased from the flowing direction of the axial airflow and a second sub-body 3032 with the diameter Q2 gradually reduced from the flowing direction of the axial airflow; the air outlet 30b is formed between the adjacent separation blades 304.
In the embodiment of the present invention, the tail frame 302 includes a tail frame body 3020, and a plurality of air holes 3021 arranged concentrically and forming the air inlet 30a are disposed on the tail frame body 3020.
In the specific embodiment of the invention, the air guide device further comprises a driving device 4 for driving each air guide device 3 to swing in the air hood; the driving device 4 comprises a first guide rail 41 and a second guide rail 42 which are arranged on the air hood and are arranged at intervals, a first slide block 43 and a second slide block 44 which are connected with the first guide rail 41 in a sliding way, an engaging part 45 which is driven by the first slide block 43 or the second slide block 44 and can drive the rotating shaft 310 to rotate, and a driving part 46 which is used for driving the first slide block 43 and the second slide block 44 to move simultaneously; the engaging portion 45 includes a first rack 451 respectively mounted on the first slider 43 and the second slider 44, and a first gear 452 disposed on each of the hoods, connected to each of the rotating shafts 310, and engaged with the first rack 451.
In the embodiment of the present invention, the driving portion 46 includes a cylinder 460 for driving the first slider 43 to move, a second rack 462 moving on the second rail 42 and connected to the first slider 43, a second gear 463 rotatably connected to the air cap and engaged with the second rack 462, and a third rack 464 mounted on the second slider 44 and engaged with the second gear 463.
The principle of the embodiment is as follows:
the recovery of the waste heat of the gas hood in this embodiment is the same as that in embodiment 1, and therefore, the description is omitted; the difference between this embodiment and embodiment 1 is that a new "air supply system" is added in this embodiment, please refer to fig. 2, and as in embodiment 1, each heater separately sends heated air into a first air hood and a second air hood, and sends air into the first air hood and the second air hood please refer to fig. 3, the second air source device can send hot air into a fourth air pipe, because the output end of the fourth air pipe is connected in series with a plurality of fifth air pipes, the hot air is distributed through the fifth air pipes and led into air holes (i.e. air inlets) arranged on the air guiding device, and the hot air is guided to the wet paper sheet moving on the drying cylinder by the guiding of the air guiding device, so as to dry the wet paper sheet;
the wind guiding principle of the present embodiment is (see fig. 4):
the hot air of the fifth air pipe enters the wind scooper through the air holes, and in the process that the hot air enters from the air holes (namely, the air inlet) and is discharged from the air outlet, because the caliber L1 of the flow guide frame of the wind scooper is set, namely: the flow direction of the axial airflow is gradually reduced to form a structure which is gradually reduced from inside to outside, so that the airflow generated in the air guide cover is changed from the direction which is basically parallel to the axial airflow to the direction which flows out towards the center of the flow guide body under the guide of the flow guide frame, and the flow direction of the airflow is also in an included angle with the central axis of the flow guide body under the guide of the inner wall of the flow guide frame;
moreover, the guide cover is internally provided with a guide body, the guide body consists of a first split body and a second split body, the diameter Q1 of the first split body is gradually enlarged from the axial airflow direction, the diameter Q2 of the second split body is gradually reduced from the axial airflow direction, the former can guide the airflow in the guide cover to each air outlet, and the latter can guide the airflow at the air outlet to the middle-lower axial direction of the guide fluid;
therefore, the air in the air guide cover can be concentrated at a certain position through the guide of the guide frame and the guide body, and under the action of the air guide cover, when the air flow blows to the wet paper, the drying effect and the drying efficiency of the wet paper can be improved;
moreover, the air holes arranged on the tail frame of the embodiment are concentrically arranged, so that the gas discharged into the wind scooper from the fifth air pipe is more uniformly distributed, and the impeller arranged in the wind scooper is matched, the impeller rotates to actively suck air from the fifth air pipe, the hot air inlet efficiency can be improved, and the drying effect on paper is further improved;
in addition, the driving device provided in this embodiment can simultaneously drive the air guiding device in each air hood to swing, and the principle is that, referring to fig. 6, the air cylinder drives the first slider to slide on the first guide rail, and since the second rack is fixedly connected with the first slider, the air cylinder can slide on the second guide rail, when the second rack moves, the air cylinder drives the second gear to rotate, and further drives the third rack fixedly connected with the second slider to move, and further drives the second slider to move, and the air cylinder can simultaneously drive the two sliders to move, and when the first slider and the second slider move, since the first rack is engaged with the first gear, the air cylinder can drive each first gear to rotate and drive the rotating shaft in each air hood to rotate, and thereby the air guiding device mounted on the rotating shaft is driven to swing;
it should be noted that: when the air guide device swings, the coverage area of hot air and wet paper sheets can be increased, and the drying effect of the wet paper sheets is improved;
referring to fig. 7, a plurality of (e.g., 2) air guiding devices may be disposed in each air hood, so as to further improve the drying effect of the wet paper.
Example 3 differs from example 2 in that:
as shown in fig. 8, a control system for controlling the second air supply assembly 22 and the air cylinder 460; wherein the control system comprises a first controller 51 for controlling the air cylinder 460, a second controller 52 for controlling the second air supply device 22, and a central control unit 53 for sending an actuating electric signal to the first controller 51 or the second controller 52; wherein the communication interface between the first controller 51 and the second controller 52 is configured in a coupled mode; in the coupled mode, the first controller 51 operates the air cylinder 460 based on the electric signal sent by the central control unit 53, and simultaneously the first controller 51 sends an electric signal to the second controller 52, and the second controller 52 operates the second air supply device 22 based on the electric signal.
In a specific embodiment of the present invention, the central control unit 53 sends an electrical signal to the first controller 51.
In addition, this embodiment further provides a drying method for paper production, which uses the drying system of this embodiment, and in the specific embodiment of the present invention, includes the following steps:
s1: providing pulp and forming a wet sheet of paper;
s2: transferring and attaching the wet paper to the surface of a drying cylinder;
s3: conveying hot air into each air hood by using an air supply system, impacting and drying the wet paper and generating damp and hot air;
s4: starting the first air source device, extracting hot and humid air in each air hood, and selecting the hot and humid air from the heating devices corresponding to the air hoods for heating;
s5: the hot air output from the heating device is continuously fed into each air hood through the air supply system, and a heating process of circularly supplying air to the air hoods is formed in step S4.
In an embodiment of the present invention, the method further includes a wind guiding method performed simultaneously with the step S3, where the wind guiding method includes the following steps:
a1: the central control unit sends an electric signal to the first controller, the first controller controls the operation of the air cylinder based on the electric signal, and simultaneously sends an electric signal to the second controller, so that the second controller operates the second air source device based on the electric signal of the first controller;
a2: the second air source device sends the gas exhausted from the heating device into the air guide covers in the air covers, meanwhile, the air cylinder drives the first sliding block and the second sliding block to move relatively, and simultaneously drives the air guide covers in the air covers to swing in the air covers, so that hot air is guided to the surface of the wet paper sheet, and the wet paper sheet is dried;
a3: the air guide cover converges hot air entering the air guide cover, and sprays out to wet paper sheets from each air outlet, so that the drying of the wet paper sheets is accelerated by improving the impact force of the hot air on the wet paper sheets.
The advantages of this embodiment are: the synchronism of the operation of the air cylinder and the second air source device can be realized through the control system; namely: utilize first controller control cylinder to recycle second controller control second air supply unit, because the cylinder is used for controlling the air ducting swing, second air supply unit is used for controlling and provides the hot-blast to air ducting, consequently, adopt this system of this embodiment can make two supplementary air ducting's parts carry out synchronous operation, supply the wind in the air ducting when the air ducting swing, and then guarantee the stability of drying wet paper, and then further improve the stoving effect to wet paper.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A drying method for paper production, characterized in that: the drying system comprises a drying cylinder (11) through which a wet paper sheet (10) passes, at least two air hoods (121, 122) arranged on the periphery of the drying cylinder (11), heating devices (131, 132) corresponding to the air hoods (121, 122) and an air supply system (20) communicated between the heating devices (131, 132) and the air hoods (121, 122); the waste heat recovery system is used for recovering the hot air in each air hood (121, 122) and returning the hot air to the heating devices (131, 132);
the air supply system (20) comprises a second air source device (22) which is communicated with the output ends of the heating devices (131, 132) through a third air pipe (21) and is provided with an input end and an output end, a fourth air pipe (23) which is communicated with the output end of the second air source device (22), a node (24) formed at the output end of the fourth air pipe (23), and a plurality of fifth air pipes (25) which are connected with the node (24) in series and are used for supplying air to the interiors of the air hoods (121, 122);
the air guide device is arranged in each air hood (121, 122); the air guiding device (3) comprises at least one air guiding cover (3000) which is connected with the inner walls of the air covers (121 and 122) through a rotating shaft (310) and is provided with an air inlet (30 a) and an air outlet (30 b), and an impeller (320) which is arranged in the air guiding cover (3000) and generates axial air flow from the air inlet (30 a) to the air outlet (30 b) when the air guiding cover operates, wherein the air inlet (30 a) is communicated with the fifth air pipe (25);
the air guide cover (3000) consists of a guide frame (300), an inner frame (301) and a tail frame (302) which are sequentially connected, a guide body (303) is arranged at the center of the guide frame (300), the caliber of the guide frame (300) is gradually reduced from the flow direction of axial airflow, a plurality of separation blades (304) connected with the guide frame (300) are arranged on the periphery of the guide body (303), and the guide body (303) consists of a first sub-body (3031) with the diameter gradually increased from the flow direction of the axial airflow and a second sub-body (3032) with the diameter gradually reduced from the flow direction of the axial airflow; the air outlet (30 b) is formed between the adjacent separating blades (304);
the air guide device also comprises a driving device (4) for driving each air guide device (3) to swing in the air hoods (121, 122); the driving device (4) comprises a first guide rail (41) and a second guide rail (42) which are arranged on the air hoods (121, 122) at intervals, a first sliding block (43) and a second sliding block (44) which are connected with the first guide rail (41) in a sliding way, an engaging part (45) which is driven by the first sliding block (43) or the second sliding block (44) and can drive the rotating shaft (310) to rotate, and a driving part (46) which is used for driving the first sliding block (43) and the second sliding block (44) to move simultaneously; wherein, the meshing part (45) comprises a first rack (451) respectively arranged on the first sliding block (43) and the second sliding block (44) and a first gear (452) which is arranged on each air hood (121, 122), connected with each rotating shaft (310) and meshed with the first rack (451);
the driving part (46) comprises a cylinder (460) for driving the first sliding block (43) to move, a second rack (462) which is movably arranged on the second guide rail (42) and connected with the first sliding block (43), a second gear (463) which is rotatably connected with the air hoods (121, 122) and meshed with the second rack (462), and a third rack (464) which is arranged on the second sliding block (44) and meshed with the second gear (463);
a control system for controlling the second air supply means (22) and the air cylinder (460); wherein the control system comprises a first controller (51) for controlling the air cylinder (460), a second controller (52) for controlling the second air supply device (22), and a central control unit (53) for sending an actuating electric signal to the first controller (51) or the second controller (52); wherein a communication interface between the first controller (51) and the second controller (52) is configured in a coupled mode; in the coupling mode, the first controller (51) operates the cylinder (460) based on the electric signal sent by the central control unit (53), and simultaneously the first controller (51) sends an electric signal to the second controller (52), and the second controller (52) operates the second air supply device (22) based on the electric signal;
the waste heat recovery system comprises exhaust pipes (30) communicated with gas hoods (121, 122), a first gas source device (31) with an input end and an output end, wherein the input end of the first gas source device is communicated with the exhaust pipes (30), a control valve (33) which is communicated with the first gas source device (31) through a first gas pipe (32) and is provided with one input end and a plurality of output ends, and a plurality of second gas pipes (34) connected between the output ends of the control valve (33) and heating devices (131, 132);
the drying method comprises the following steps:
s1: providing pulp and forming a wet sheet of paper;
s2: transferring and attaching the wet paper to the surface of a drying cylinder;
s3: conveying hot air into each air hood by using an air supply system, impacting and drying the wet paper and generating damp and hot air;
s4: starting the first air source device, extracting hot and humid air in each air hood, and selecting the hot and humid air from the heating devices corresponding to the air hoods for heating;
s5: continuously feeding the hot air output from the heating device into each air hood through an air supply system, and forming a heating process of circularly supplying air to the air hoods with the step S4;
the method also comprises a wind guiding method which is carried out simultaneously with the step S3, and the wind guiding method comprises the following steps:
a1: the central control unit sends an electric signal to the first controller, the first controller controls the operation of the air cylinder based on the electric signal, and simultaneously sends an electric signal to the second controller, so that the second controller operates the second air source device based on the electric signal of the first controller;
a2: the second air source device sends the gas exhausted from the heating device into the air guide covers in the air covers, meanwhile, the air cylinder drives the first sliding block and the second sliding block to move relatively, and simultaneously drives the air guide covers in the air covers to swing in the air covers, so that hot air is guided to the surface of the wet paper sheet, and the wet paper sheet is dried;
a3: the air guide cover converges hot air entering the air guide cover, and sprays out to wet paper sheets from each air outlet, so that the drying of the wet paper sheets is accelerated by improving the impact force of the hot air on the wet paper sheets.
2. A drying method for paper production according to claim 1, characterized in that: the tail frame (302) comprises a tail frame body (3020) and a plurality of air holes (3021) which are arranged in a concentric circle and form the air inlet (30 a) are formed in the tail frame body (3020).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411575.8A CN111560788B (en) | 2020-05-15 | 2020-05-15 | Drying system for paper production and drying method thereof |
| AU2020280990A AU2020280990A1 (en) | 2020-05-15 | 2020-11-30 | The invention relates to a drying system for paper production and a drying method thereof, wherein the drying system comprises a drying cylinder through which wet paper passes, at least two air hoods arranged at the periphery of the drying cylinder, heating devices corresponding to the air hoods and an air supply system communicated between the heating devices and the air hoods, and is characterized in that: the waste heat recovery system is used for recovering hot air in each air hood and returning the hot air to the heating device. |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010411575.8A CN111560788B (en) | 2020-05-15 | 2020-05-15 | Drying system for paper production and drying method thereof |
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| CN111560788A CN111560788A (en) | 2020-08-21 |
| CN111560788B true CN111560788B (en) | 2021-03-23 |
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| CN111993560B (en) * | 2020-09-03 | 2022-02-18 | 浙江巨通管业有限公司 | Maintenance system of concrete pipe |
| CN113180185B (en) * | 2021-05-31 | 2022-04-22 | 浙江善蒸坊食品股份有限公司 | Automatic steamed bun production system and production process thereof |
| CN117743772B (en) * | 2023-12-29 | 2024-05-28 | 维达纸业(浙江)有限公司 | Toilet paper drying parameter optimization method and system based on artificial intelligent model |
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| AU2020280990A1 (en) | 2021-12-02 |
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