Drying part air draft paper stabilizing systemTechnical Field
The utility model relates to the technical field of drying of papermaking, in particular to an air draft paper stabilizing system of a drying part.
Background
The dryer section of a paper machine generally refers to the section between the press unit and the coating unit of the paper machine and the section between the coating unit and the calendering unit. According to the relative positions of the drying agent in the whole paper machine production line, the drying agent is divided into pre-drying, intermediate drying and post-drying. For large cylinder paper machines, large diameter cylinders also belong to the machine dryer section. The main function of the paper machine drying part is to dewater the wet paper web, ensure that the paper sheet reaches the dryness of the finished paper, and simultaneously adjust the longitudinal and transverse water content of the paper sheet to be consistent quantitatively and ensure the paper sheet performance. Chinese patent No. 201610628053.7 discloses a drying section of a papermaking dryer, which comprises a steel mesh belt (the steel mesh belt is a dry mesh for carrying paper) with a driving roller which circularly rotates, the steel mesh belt comprises an upper steel mesh belt arranged above the driving roller and a lower steel mesh belt arranged below the driving roller, a plurality of upper hot air boxes blowing downwards from top to bottom are arranged above the upper steel mesh belt, a plurality of lower hot air boxes blowing upwards from bottom to top are arranged below the upper steel mesh belt, the lower steel mesh belt is attached to a plurality of first rollers, the air outlet end of a heat exchanger is respectively connected with the upper hot air boxes and the lower hot air boxes through a first exhaust fan, and the air outlet is arranged near the upper steel mesh belt and connected with the air inlet end of the heat exchanger.
The cold air in the drying part of the papermaking dryer is heated to hot air after passing through the heat exchanger, the hot air is vertically blown to the steel mesh belt from the upper hot air box and the lower hot air box under the action of the first exhaust fan, the heat is transferred to the paper sheet, and high-temperature and high-humidity water vapor evaporated from the paper is taken away. The whole flow can be seen that the material utilization and energy conversion are circularly operated in a closed and complete system, and the final product is water without any pollution. However, the upper part of the drying part is in an open structure, the process of drying paper is not carried out in a relatively closed space, and a heat exchanger is required to be arranged in the up-down direction of the steel mesh belt, so that the structure has high production cost and is not simple. Thus, there is a need for further improvement.
Disclosure of utility model
The utility model aims to provide an air draft paper stabilizing system of a drying part, wherein an air hood is arranged above a drying section, the air hood covers the drying section and forms a drying chamber, the process of drying paper is carried out in a relatively airtight space, the influence of external cold air on the drying process of the paper is effectively prevented, a heat exchange device is arranged on the air hood corresponding to each drying section, the structure that a heat exchanger is arranged below a conveying belt of the paper in the prior art is eliminated, and further the production cost and the maintenance cost of the later heat exchanger are reduced.
The purpose of the utility model is realized in the following way:
The utility model provides a dry portion convulsions steady paper system, including the dry section that is equipped with blast apparatus, dry section top is equipped with the gas hood, the gas hood covers dry section and forms the drying chamber, be equipped with heat exchange device corresponding to every dry section on the gas hood, be equipped with air inlet pipeline and air-out pipeline between heat exchange device and the gas hood, unnecessary hot air in the drying chamber gets into in the heat exchange device through the air-out pipeline and discharges outside air, in order to reach atmospheric pressure equilibrium, outside air gets into heat exchange device and gets into in the drying chamber through the air inlet pipeline, during the unnecessary hot air gets into heat exchange device through the air-out pipeline in the drying chamber, in order to preheat the outside air that gets into heat exchange device, dry section top is equipped with the gas hood, the gas hood covers dry section and forms the drying chamber, the process of drying paper goes on relatively airtight space, effectively prevent that outside cold air from influencing the drying process of paper, be equipped with heat exchange device corresponding to every dry section on the gas hood, cancel the structure that sets up a heat exchanger in the conveyer belt below the paper in the prior art respectively, and then reduce production cost, the maintenance cost of later heat exchanger.
The heat exchange device comprises a first heat exchange box and a first fan arranged on the first heat exchange box, an air outlet and an air inlet which are communicated with outside air are arranged on the first heat exchange box, an exhaust pipeline and an air inlet pipeline which are communicated with the drying chamber are arranged on the air cover, and the exhaust pipeline is connected and communicated with the air outlet of the first heat exchange box to form an air outlet pipeline for discharging the excessive heat air of the drying chamber; the air inlet is communicated with the air inlet of the first fan, the air outlet of the first fan is connected and communicated with the air inlet pipeline to form an air inlet pipeline for outside air to enter the drying chamber, and the air inlet pipeline is beneficial to traction of the outside air to enter the first heat exchange box for heat exchange with the first fan so as to prevent the outside cold air from entering the drying chamber to generate condensed water.
The air outlet that first heat exchange box corresponds first fan is equipped with dodges the opening, is convenient for dodge and is equipped with the wind scooper on the opening, can connect the air inlet line on the wind scooper, effectively carries the external cold air after preheating to the drying chamber in.
One end of an air inlet pipeline of the heat exchange device is provided with a gas preheating detection device, the gas preheating detection device comprises a temperature sensor and/or a humidity sensor, so that the temperature and/or the humidity of external air entering the heat exchange device are detected, and the temperature and/or the humidity of external cold air are detected to calculate the temperature required by the external air to be heated, so that condensation water drops are effectively prevented from being generated in a drying chamber, and the energy-saving effect is achieved.
The air preheating detection device further comprises a second heat exchange box and a second fan arranged on the second heat exchange box, an air inlet channel communicated with outside air is formed in the second heat exchange box, a detection probe of a temperature sensor and/or a humidity sensor stretches into the air inlet channel, an air inlet of the second fan is communicated with the air inlet channel, an air outlet channel communicated with the first heat exchange box is further formed in the second heat exchange box, an air outlet of the second fan is communicated with the air outlet channel, a steam channel connected with the air inlet channel is further formed in the second heat exchange box, and when the temperature sensor and/or the humidity sensor detects that outside air entering the air inlet channel does not reach a system set value, the steam channel enters hot steam and carries out steam heating on outside air entering the air inlet channel, so that outside air entering the air inlet channel is close to the system set value, and outside air approaching the system set value enters the first heat exchange box through the second heat exchange box. The electromagnetic valve can control the steam quantity entering the steam channel, prevent too much steam from entering the steam channel, achieve the energy-saving effect, the steam of the steam channel also heats the external cold air once, effectively prevents the external cold air entering the drying chamber through the first heat exchange box from generating condensed water due to too low temperature, and ensures the reliability of the papermaking drying process.
One end of the steam channel is provided with a steam heating device, a normally closed electromagnetic valve is arranged at the communication part between the steam channel and the air inlet channel, and the steam channel is communicated with the air inlet channel through opening the electromagnetic valve.
The steam heating device comprises a steam generator and a steam box, and when the steam needs to be generated, the steam generator works to generate the hot steam; or the steam heating device comprises an air pump and a hot air heat preservation storage box, and the air exhausted from the drying chamber part enters the hot air heat preservation storage box through a pipeline to be stored (the air outlet of the first heat exchange box is connected with the air inlet of the hot air heat preservation storage box), and when the hot air needs to be conveyed, the air pump is started.
The heat exchange device also comprises an exhaust fan arranged on the first heat exchange box, the air suction inlet of the exhaust fan is communicated with the exhaust outlet of the exhaust fan, and the air outlet of the first heat exchange box is communicated with the exhaust outlet of the exhaust fan.
The air outlet of the first heat exchange box is provided with a filter screen, hot air exhausted from the drying chamber enters the filter screen to be filtered and then is exhausted into the outside air, and as the mucilage is arranged on the paper, when the hot air is exhausted from the drying chamber, the volatile matters of part of mucilage are prevented from being exhausted into the outside air along with the hot air, so that the filter screen is arranged on the air outlet of the first heat exchange box, and the hot air exhausted from the drying chamber can be filtered.
The filter screen top is equipped with sprays belt cleaning device, sprays belt cleaning device including a plurality of shower nozzle that corresponds the filter screen setting, the shower pipe who is connected with a plurality of shower nozzle, and shower pipe one end is equipped with the pump body, ooff valve, and the filter screen needs to carry out periodic cleaning, consequently needs to set up and sprays belt cleaning device, and the pump body is the water pump, and water supply installation is connected to water pump one end, like the staving of storing the washing liquid.
The utility model provides a drying part convulsions steady paper system, still include steady paper bellows device, steady paper bellows device includes the deflector roll that a plurality of is used for pulling the paper motion, and the dry net of cyclic motion on a plurality of deflector roll, the deflector roll rotates to set up in the frame, dry net cladding a plurality of deflector roll, deflector roll one side is equipped with the bellows, the bellows is equipped with the first opening and the second opening of its inner chamber of intercommunication, the second opening of bellows passes through the hose connection fan, be equipped with the slot that forms a plurality of wind channel on the deflector roll, the fan is through first opening, the air between the wind channel extraction net and the transport paper, so that the paper attaches on dry net under the atmospheric pressure effect, reach the effect of stabilizing paper transport, the air exhauster of big amount of wind realizes variable frequency control through inverter motor, in order to guarantee to take away the air between paper and the dry net. The surface of the guide roller is provided with a line structure of grooves so as to generate an air duct, so that the paper is better adsorbed on the surface of the dry net.
The beneficial effects of the utility model are as follows:
The air hood is arranged above the drying section, the air hood covers the drying section and forms a drying chamber, the process of drying paper is carried out in a relatively airtight space, the influence of external cold air on the drying process of the paper is effectively prevented, a heat exchange device is arranged on the air hood corresponding to each drying section, the structure that a heat exchanger is arranged in the prior art on the upper and lower directions of a conveying belt of the paper is eliminated, the production cost is further reduced, and the maintenance cost of the later heat exchanger is reduced.
Drawings
Fig. 1 is a schematic plan view of a dryer section air-draft paper-stabilizing system according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a pipe connection structure between a first heat exchange tank and a second heat exchange tank according to an embodiment of the present utility model.
Fig. 3 is a schematic perspective view of a paper stabilizing device according to an embodiment of the utility model.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
Referring to fig. 1-3, an air draft paper stabilizing system of a drying part comprises a drying section 2 provided with an air blower 1, wherein an air hood 3 is arranged above the drying section 2, the air hood 3 covers the drying section 2 and forms a drying chamber, a heat exchange device 4 is arranged on the air hood 3 corresponding to each drying section 2, an air inlet pipeline and an air outlet pipeline are arranged between the heat exchange device 4 and the air hood 3, redundant hot air in the drying chamber enters the heat exchange device 4 through the air outlet pipeline and is discharged into the outside air so as to achieve air pressure balance, the outside air enters the heat exchange device 4 through the air inlet pipeline and enters the drying chamber, and when the redundant hot air in the drying chamber enters the heat exchange device 4 through the air outlet pipeline, the outside air entering the heat exchange device 4 is preheated.
In this embodiment, the air hood 3 is fixedly connected to the support of the drying section 2 by a support frame, so that the air hood 3 is located above the drying section 2.
The heat exchange device 4 comprises a first heat exchange box 5 and a first fan arranged on the first heat exchange box 5, wherein an air outlet and an air inlet which are communicated with outside air are formed in the first heat exchange box 5, an exhaust pipeline 6 and an air inlet pipeline which are communicated with the drying chamber are formed in the gas hood 3, and the exhaust pipeline 6 is connected and communicated with the air outlet of the first heat exchange box 5 to form an air outlet pipeline for discharging the excessive heat air in the drying chamber; the air inlet is communicated with the air inlet of the first fan, and the air outlet of the first fan is connected and communicated with the air inlet pipeline so as to form an air inlet pipeline for outside air to enter the drying chamber.
In this embodiment, two independent cavities are arranged in the first heat exchange box 5at intervals, one of which is an air inlet cavity for entering cold air from outside, and the other is an air outlet cavity for discharging the excess heat air in the drying chamber.
The first heat exchange box 5 is provided with an avoidance opening corresponding to the air outlet of the first fan.
One end of the air inlet pipeline of the heat exchange device 4 is provided with a gas preheating detection device 7, and the gas preheating detection device 7 comprises a temperature sensor and/or a humidity sensor so as to detect the temperature and/or the humidity of the external air entering the heat exchange device 4.
The gas preheating detection device 7 further comprises a second heat exchange box 8 and a second fan arranged on the second heat exchange box 8, an air inlet channel 9 for communicating outside air is arranged on the second heat exchange box 8, a detection probe of a temperature sensor and/or a humidity sensor stretches into the air inlet channel 9, an air inlet of the second fan is communicated with the air inlet channel 9, an air outlet channel 10 communicated with the first heat exchange box 5 is further arranged on the second heat exchange box 8, an air outlet of the second fan is communicated with the air outlet channel 10, a steam channel 11 connected with the air inlet channel 9 is further arranged on the second heat exchange box 8, and when the temperature sensor and/or the humidity sensor detects that outside air entering the air inlet channel 9 does not reach a system set value, the steam channel 11 enters hot steam and carries out steam heating on outside air entering the air inlet channel 9 so that outside air entering the air inlet channel 9 approaches the system set value, and outside air approaching the system set value enters the first heat exchange box 5 through the second heat exchange box 8.
One end of the steam channel 11 is provided with a steam heating device, a normally closed electromagnetic valve is arranged at the communication part between the steam channel 11 and the air inlet channel 9, and the steam channel 11 is communicated with the air inlet channel 9 through opening the electromagnetic valve.
In this embodiment, the control system includes a controller, and the controller is electrically connected to the solenoid valve, the steam generator, and the like through a wiring harness. When the steam heating device needs to be started, the controller controls the steam generator and the electromagnetic valve to be started.
The heat exchange device 4 further comprises an exhaust fan arranged on the first heat exchange box 5, an air suction opening of the exhaust fan is communicated with the exhaust fan, and an air outlet of the first heat exchange box 5 is communicated with an air outlet of the exhaust fan.
A filter screen is arranged on the air outlet of the first heat exchange box 5, and hot air discharged from the drying chamber enters the filter screen for filtering and then is discharged into the outside air.
In this embodiment, the filter mesh may be inserted into the air outlet of the first heat exchange tank 5 through a clamping groove, or the filter mesh may be screwed to the outside of the air outlet of one heat exchange tank 5.
The filter screen top is equipped with spray cleaning device 12, and spray cleaning device 12 is equipped with the pump body, ooff valve including a plurality of shower nozzles that correspond the filter screen setting, the shower pipe who is connected with a plurality of shower nozzle, shower pipe one end.
In this embodiment, one end of the pump body is connected with the whole body of the cleaning liquid or the tap water pipe through a water pipe, and after the control valve is opened, the pump body is pressurized to convey the cleaning liquid or tap water to the spray pipeline.
The drying part convulsions steady paper system, still include steady paper bellows device, steady paper bellows device includes the deflector roll 13 that a plurality of is used for pulling the paper motion, and the dry net 14 of cyclic motion on a plurality of deflector roll 13, deflector roll 13 rotates to set up in the frame, dry net 14 cladding a plurality of deflector roll 13, deflector roll 13 one side is equipped with bellows 15, bellows 15 is equipped with the first opening and the second opening 16 of intercommunication its inner chamber, bellows 15's second opening 16 passes through the hose connection fan, be equipped with the slot that forms a plurality of wind channel on the deflector roll 13, the fan is through first opening, wind channel extraction dry net 14 and the air of carrying between the paper, so that the paper attaches on dry net 14 under the atmospheric pressure effect, reach the effect of steady paper transportation.
In this embodiment, the two sides of the bellows 15 are respectively provided with a mounting bracket in an extending manner, and the mounting brackets are fixed on the frame. The guide roller 13 is rotatably arranged on the frame through a rotating shaft, and a motor in transmission connection with the rotating shaft of the guide roller 13 is arranged on the frame.
The foregoing is a preferred embodiment of the utility model showing and describing the general principles, features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.