CN114318918B - Chemical mechanical pulp preparation process - Google Patents
Chemical mechanical pulp preparation process Download PDFInfo
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- CN114318918B CN114318918B CN202111647940.6A CN202111647940A CN114318918B CN 114318918 B CN114318918 B CN 114318918B CN 202111647940 A CN202111647940 A CN 202111647940A CN 114318918 B CN114318918 B CN 114318918B
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a chemical mechanical pulp preparation process, which comprises the following steps: steaming and preheating, spiral conveying, steaming and boiling, gao Wensi conversion and high-concentration reaction; steaming and preheating the washed wood chips in steaming and preheating equipment, conveying the preheated and softened wood chips to steaming equipment by screw conveying equipment for steaming, and fully mixing and absorbing the wood chips and the added chemicals in the steaming process; the wood chips after being steamed enter high-temperature fibrillation equipment to be subjected to high-temperature fibrillation, and paper pulp separated in the high-temperature fibrillation process enters high-concentration reaction equipment to be further reacted into pulp. By optimizing the matching of mechanical equipment and reaction environment, wood chips are more energy-saving and more effective, the equipment quantity and the equipment power consumption are reduced, the cooking reaction and the high-temperature high-pressure filamentization process are enhanced, and the recovery steam is ensured to reduce the energy consumption. Finally, the energy consumption and the investment cost are reduced by the process method, and the development of the chemical pulp industry is promoted.
Description
Technical Field
The invention belongs to the technical field of chemi-mechanical pulp preparation, and particularly relates to a process for preparing chemi-mechanical pulp from washed wood chips (such as poplar chips, bamboo chips and the like).
Background
The main method for preparing the chemi-mechanical pulp in the prior art is to prepare the pulp by a process method of an impregnating bin, a conveying screw, an extrusion tearing machine, a conveying screw, a wood chip reaction bin, a high-concentration grinding system, a mixed dosing screw and a medium-concentration reaction bin, wherein a large amount of chemicals are needed to be added at two parts of the wood chip reaction bin and the medium-concentration reaction bin, and the extrusion tearing machine and the high-concentration grinding have large power consumption, so that the pulping cost is high. In addition, the process is complex, the equipment is more, the occupied area is large, and the investment cost is high.
Disclosure of Invention
In order to overcome the defects described in the prior art, the invention provides a chemical pulp preparation process, which is used for preparing chemical pulp by performing the procedures of steaming, preheating, steaming, gao Wensi chemical treatment and high-concentration reaction on the washed wood chips.
The technical scheme adopted by the invention is as follows:
a chemical-mechanical pulp preparation process comprises the following steps: steaming and preheating, spiral conveying, steaming and boiling, gao Wensi conversion and high-concentration reaction;
steaming and preheating the washed wood chips in steaming and preheating equipment, conveying the preheated and softened wood chips to steaming equipment by screw conveying equipment for steaming, and fully mixing and absorbing the wood chips and the added chemicals in the steaming process; the wood chips after being steamed enter high-temperature fibrillation equipment to be subjected to high-temperature fibrillation, and paper pulp separated in the high-temperature fibrillation process enters high-concentration reaction equipment to be further reacted into pulp.
As a preferable scheme of the invention, the steam separated in the Gao Wensi process is led to a steaming preheating device for recycling through a reflux steam pipeline; and/or a reflux steam pipe communicated with the high-temperature filamentization equipment is arranged between the cooking equipment and the high-temperature filamentization equipment. The steam separated by Gao Wensi equipment is recycled through a reflux steam pipeline, so that energy is saved, and the reflux steam pipeline between the stewing equipment and the high-temperature fibrillation equipment balances the pressure between the two equipment.
As a preferred scheme of the invention, the steaming preheating device comprises a grid bin feeder, a steaming bin and a metering screw; the grid bin feeder is arranged at the top of the steaming bin, and uniformly feeds the washed wood chips into the steaming bin and seals the steaming bin to prevent steam from overflowing; the metering screw is arranged at the lower part of the steaming bin, and discharges and meters the steamed and softened wood chips. The material level of the steaming bin is generally stabilized to about 80 percent and is adjustable according to the process, most of the high-temperature steam entering from the bottom is recycled steam, and the small part of the high-temperature steam uses fresh steam, so that the wood chips stay in the steaming bin for a period of time and are adjustable according to the process, and the purpose of softening and heating the wood chips can be achieved through the process.
As a preferable scheme of the invention, a material stirring device is arranged at the lower part of the steaming bin, and the material stirring device discharges wood chips in the steaming bin into the metering screw so as to avoid bridging and blocking when materials are discharged into the metering screw; the metering screw can ensure uniform and stable discharge.
As a preferable mode of the invention, the spiral conveying equipment at least comprises one conveying spiral, and adjacent conveying spirals are connected in series; the feeding hole of the first conveying screw corresponds to the discharging hole of the metering screw, and the discharging hole of the last conveying screw corresponds to the cooking equipment.
The spiral conveying equipment at least comprises a horizontal conveying spiral, a vertical lifting conveying spiral and an inclined lifting conveying spiral; the feed inlet of the horizontal conveying screw corresponds to the discharge outlet of the metering screw; the discharge hole of the horizontal conveying screw is correspondingly connected with the feed hole of the vertical lifting conveying screw; the discharge hole of the vertical lifting conveying screw is connected with the feed hole of the inclined lifting conveying screw; the discharge hole of the inclined lifting conveying screw corresponds to the feed hole of the cooking equipment.
A connecting chute is arranged at the discharge hole of the inclined lifting conveying screw and is correspondingly connected with the feed inlet of the cooking equipment;
as a preferable scheme of the invention, the cooking equipment comprises a spiral feeder, a T-shaped pipe, a cooking pipe, a balance bin and an expansion joint; the feed inlet of the spiral feeder is connected with the discharge outlet of the spiral conveying equipment in a sealing way; the discharge gate and the T type pipe intercommunication of spiral feeder, the spiral feeder will preheat the wood chip crushing compression compaction after the softening and become timber stopper and send into in the T type pipe, and bulk cargo mechanism is installed to the T type pipe, bulk cargo mechanism is including preventing reverse-spraying conical head and actuating cylinder, prevents reverse-spraying conical head and stretches into in the T type pipe, actuating cylinder drive prevents reverse-spraying conical head and keeps certain pressure to push against the timber stopper. The timber plugs scattered by the bulk material mechanism enter the cooking tube from the T-shaped tube; the cooking tube is a high temperature, high pressure cooking environment in which wood is in contact with the added chemicals.
In order to facilitate full mixing, the cooking tube is provided with a special-shaped spiral stirring mechanism, and wood chips and chemicals are fully mixed and absorbed for reaction in the stirring and conveying process of the special-shaped spiral stirring mechanism; the material outlet of the cooking pipe is correspondingly connected with the material inlet of the balance bin, the balance bin is in an inverted cone shape, and the bottom of the balance bin is provided with a stirring mechanism and a material discharging conveying screw, so that the effects of buffering materials and uniformly discharging materials are achieved; the discharge port of the discharge conveying screw is connected with Gao Wensi equipment through an expansion joint; the expansion joint is a flexible connection with a displacement compensation function, and compensates thermal expansion displacement during high-temperature operation; and the steam inlet of the T-shaped pipe is communicated with the steam outlet of the belt conveying screw in Gao Wensi equipment.
As a preferred embodiment of the present invention, the Gao Wensi converting apparatus includes a side feed conveyor screw, a belt conveyor screw, a Gao Wensi converting machine, a blow pipe, a cyclone separator, and a plug conveyor screw; the feeding hole of the side feeding conveying screw is connected with the expansion joint, the discharging hole of the side feeding conveying screw is communicated with the belt conveying screw, and the screw diameter of the side feeding conveying screw is gradually reduced from the feeding hole to the discharging hole; the material conveying and compressing device has a certain compression function, and the material is conveyed and compressed to form a certain material plug and then enters a belt conveying screw; the spiral of the belt conveying spiral is hollow, the entering materials are sent into a Gao Wensi machine through the spiral belt of the outer circle, the belt conveying spiral sends the steamed wood chips into a Gao Wensi machine, and the steamed wood chips are kneaded and filamentized in a space between high-rotating-speed rotor fluted discs of the Gao Wensi machine, so that the wood chips are highly filamentized, the reaction is accelerated, and the pulp is formed initially; pulp is sprayed out from an outlet through the operation of a digestion pressure and a rotor, is guided to a cyclone separator through a spray pipe from an outlet of a Gao Wensi machine, the cyclone separator separates the pulp from steam, the pulp is discharged into a plug conveying screw, and the plug conveying screw conveys and compacts the pulp and then discharges the pulp to high-concentration reaction equipment for further reaction to obtain pulp; steam is discharged from the cyclone separator steam discharge port and is led to the steaming bin through a reflux steam pipe.
The pulping process provided by the invention is characterized in that the mechanical equipment and the reaction environment are optimized, so that the wood chips are more energy-saving and more effective, the equipment quantity and the equipment power consumption are reduced, the steaming reaction and the high-temperature high-pressure pulping process are enhanced, and the recovery steam is ensured to reduce the energy consumption. Finally, the energy consumption and the investment cost are reduced by the process method, and the development of the chemical pulp industry is promoted.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the process equipment connection of the present invention.
Fig. 2 is a schematic structural view of the steaming preheating apparatus of the present invention.
Fig. 3 is a schematic view of the structure of the conveying screw apparatus of the present invention.
Fig. 4 is a schematic structural view of the cooking apparatus of the present invention.
Fig. 5 is a schematic structural view of the high temperature fiberizing apparatus of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Examples:
a chemical-mechanical pulp preparation process comprises the following steps: steaming and preheating, spiral conveying, steaming and boiling, gao Wensi conversion and high-concentration reaction; as shown in fig. 1, the washed wood chips are steamed and preheated in a steaming and preheating device 1, the preheated and softened wood chips are conveyed to a steaming device 3 by a spiral conveying device 2 in a spiral manner for steaming and boiling, and the wood chips and added chemicals are fully mixed and absorbed in the steaming and boiling process; the steamed wood chips enter high-temperature fibrillation equipment 4 for high-temperature fibrillation, and paper pulp separated in the high-temperature fibrillation process enters high-concentration reaction equipment 5 for further reaction to form pulp; the steam separated in the Gao Wensi process is led to a steaming preheating device for recycling through a reflux steam pipeline 6; and a communicated reflux steam pipe is arranged between the steaming equipment and the high-temperature silk-forming equipment. The steam separated by Gao Wensi equipment is recycled through a reflux steam pipeline, so that energy is saved, and the reflux steam pipeline between the stewing equipment and the high-temperature fibrillation equipment balances the pressure between the two equipment.
Specifically, as shown in fig. 2, the steaming preheating apparatus 1 includes a bin feeder 101, a steaming bin 102, and a metering screw 103; the bin feeder 101 is arranged at the top of the steaming bin 102, and the bin feeder 101 uniformly feeds the washed wood chips into the steaming bin 102 and seals the steaming bin 102 to prevent steam from overflowing; a metering screw 103 is installed at the lower portion of the steaming bin 102, and the metering screw 103 discharges and meters the steamed softened chips. The material level of the steaming bin 102 is generally stabilized to be about 80 percent and is adjustable according to the process, most of the steam entering the bottom at high temperature is recycled steam, and the other part of the steam is fresh steam, so that the wood chips stay in the steaming bin for a period of time and are adjustable according to the process, and the purpose of softening and heating the wood chips can be achieved through the process.
A material stirring device is arranged at the lower part of the steaming bin 102, and the material stirring device discharges wood chips in the steaming bin 102 into the metering screw 103, so that bridging and blocking are avoided when materials are discharged into the metering screw; the metering screw can ensure uniform and stable discharge.
As shown in fig. 3, the spiral conveying apparatus 2 at least comprises one conveying spiral, and adjacent conveying spirals are connected in series; the feeding hole of the first conveying screw corresponds to the discharging hole of the metering screw 103, the discharging hole of the last conveying screw corresponds to the cooking equipment, and the specific setting can be adjusted according to the equipment arrangement.
The screw conveyor 2 employed in the present embodiment includes a horizontal conveyor screw 201, a vertical lift conveyor screw 202, and an inclined lift conveyor screw 203; the feed inlet of the horizontal conveying screw 201 corresponds to the discharge outlet of the metering screw 103; the discharge port of the horizontal conveying screw 201 is correspondingly connected with the feed port of the vertical lifting conveying screw 202; the discharge port of the vertical lifting conveying screw 202 is connected with the feed port of the inclined lifting conveying screw 203; the discharge port of the inclined lifting conveying screw 203 is provided with a connecting chute 204, and the connecting chute 204 is correspondingly connected with the feed port of the cooking equipment.
As shown in fig. 4, the cooking apparatus 3 comprises a screw feeder 301, a T-shaped pipe 302, a cooking pipe 303, a balance bin 304 and an expansion joint 305; the feed inlet of the screw feeder 301 is connected with the discharge outlet of the screw conveying equipment 2 in a sealing way; the discharge port of the screw feeder 301 is communicated with the T-shaped pipe 302, the screw feeder 301 crushes and compacts the preheated and softened wood chips into wood plugs, the wood plugs are fed into the T-shaped pipe 302, the T-shaped pipe 302 is provided with a bulk material mechanism, the bulk material mechanism comprises a blowout prevention cone head and a driving cylinder, the blowout prevention cone head stretches into the T-shaped pipe 302, and the driving cylinder drives the blowout prevention cone head and keeps a certain pressure against the wood plugs. The timber plugs scattered by the bulk material mechanism enter the cooking pipe 303 from the T-shaped pipe 302; the cooking tube 303 is a high temperature, high pressure cooking environment in which wood is in contact with the added chemicals.
In order to facilitate the full mixing, the cooking tube 303 is provided with a special-shaped spiral stirring mechanism, and the wood chips and chemicals are fully mixed and absorbed for reaction in the stirring and conveying process of the special-shaped spiral stirring mechanism; the discharge hole of the stewing pipe 303 is correspondingly connected with the feed hole of the balance bin 304, the balance bin is in an inverted cone shape, and the bottom of the balance bin 304 is provided with a stirring mechanism 3041 and a discharge conveying screw 3042, so that the effects of buffering materials and uniformly discharging materials are achieved; the discharge port of the discharge conveying screw 3042 is connected with Gao Wensi equipment through an expansion joint 305; the expansion joint is a flexible connection with a displacement compensation function, and compensates thermal expansion displacement during high-temperature operation; and the steam inlet of the T-shaped pipe 302 is communicated with the steam outlet of the belt type conveying screw 402 in Gao Wensi equipment.
As shown in fig. 5, the Gao Wensi converting apparatus 4 comprises a side feed screw 401, a belt screw 402, a Gao Wensi converting machine 403, a discharge pipe 404, a cyclone 405, and a plug screw 406; the feed inlet of the side feed conveying screw 401 is connected with the expansion joint 305, the discharge outlet of the side feed conveying screw 401 is communicated with the belt conveying screw 402, and the screw diameter of the side feed conveying screw 401 is gradually reduced from the feed inlet to the discharge outlet; the material is conveyed and compressed to form a certain material plug and then enters the belt conveying screw 402; the spiral of the belt conveying spiral 402 is hollow, the entering materials are sent into a Gao Wensi machine through the spiral belt of the outer circle, the belt conveying spiral 402 sends the steamed wood chips into a Gao Wensi machine 403, and the steamed wood chips are kneaded and filamentized between high-rotation-speed rotor fluted discs of the Gao Wensi machine 403, so that the wood chips are highly filamentized, the reaction is accelerated, and the pulp is formed initially; pulp is discharged from an outlet through a cooking pressure and rotor operation, is guided to a cyclone 405 through a discharge pipe 404 from an outlet of a Gao Wensi machine 403, the cyclone 405 separates the pulp from steam, the pulp is discharged into a plug conveying screw 406, and the plug conveying screw 406 conveys and compacts the pulp and then discharges the pulp to a high-concentration reaction device 5 for further reaction to obtain pulp; steam exits the cyclone 405 and is directed to the steaming bin 102 by a return steam line.
In the description of the present specification, reference to the terms "one embodiment," "example," "specific example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. A chemical mechanical pulp preparation process is characterized by comprising the following steps: steaming and preheating, spiral conveying, steaming and boiling, gao Wensi conversion and high-concentration reaction;
steaming and preheating the washed wood chips in steaming and preheating equipment, conveying the preheated and softened wood chips to steaming equipment by screw conveying equipment for steaming, and fully mixing and absorbing the wood chips and the added chemicals in the steaming process; the steamed wood chips enter high-temperature fibrillation equipment to be subjected to high-temperature fibrillation, and paper pulp separated in the high-temperature fibrillation process enters high-concentration reaction equipment to be further reacted into pulp;
the cooking equipment (3) comprises a screw feeder (301), a T-shaped pipe (302), a cooking pipe (303), a balance bin (304) and an expansion joint (305); the feed inlet of the spiral feeder (301) is connected with the discharge outlet of the spiral conveying equipment (2) in a sealing way; the discharge hole of the screw feeder (301) is communicated with the T-shaped pipe (302), the screw feeder (301) crushes and compacts the preheated and softened wood chips into wood plugs, the wood plugs are sent into the T-shaped pipe (302), the T-shaped pipe (302) is provided with a bulk mechanism, and the wood plugs scattered by the bulk mechanism enter the cooking pipe (303) from the T-shaped pipe (302);
the cooking pipe (303) is provided with a special-shaped spiral stirring mechanism, and wood chips and chemicals are fully mixed and absorbed for reaction in the stirring and conveying process of the special-shaped spiral stirring mechanism; a discharge hole of the cooking pipe (303) is correspondingly connected with a feed hole of the balance bin (304), and a stirring mechanism (3041) and a discharge conveying screw (3042) are arranged at the bottom of the balance bin (304); the discharge port of the discharge conveying screw (3042) is connected with Gao Wensi equipment through an expansion joint (305); and the steam inlet of the T-shaped pipe (302) is communicated with the steam outlet of the belt type conveying screw (402) in Gao Wensi equipment.
2. The chemical-mechanical pulp preparation process according to claim 1, characterized in that: the steam separated in the Gao Wensi process is led to a steaming preheating device through a reflux steam pipeline for recycling; and/or a reflux steam pipe communicated with the high-temperature filamentization equipment is arranged between the cooking equipment and the high-temperature filamentization equipment.
3. The chemical-mechanical pulp preparation process according to claim 2, characterized in that: the steaming preheating device (1) comprises a feeder (101), a steaming bin (102) and a metering screw (103); the feeder (101) is arranged at the top of the steaming bin (102), and the feeder (101) uniformly feeds the washed wood chips into the steaming bin (102) and seals the steaming bin (102) to prevent steam from overflowing; the metering screw (103) is arranged at the lower part of the steaming bin (102), and the metering screw (103) discharges and meters the steamed and softened wood chips.
4. A chemical mechanical pulp preparation process according to claim 3, characterized in that: a material stirring device is arranged at the lower part of the steaming bin (102), and the material stirring device discharges the wood chips in the steaming bin (102) into a metering screw (103).
5. The chemical mechanical pulp preparation process according to claim 3 or 4, characterized in that: the spiral conveying equipment (2) at least comprises one conveying spiral, and adjacent conveying spirals are connected in series; the feed inlet of the first conveying screw corresponds to the discharge outlet of the metering screw (103), and the discharge outlet of the last conveying screw corresponds to the cooking equipment.
6. The chemical-mechanical pulp preparation process according to claim 5, characterized in that: the bulk cargo mechanism comprises a reverse spraying prevention cone head and a driving cylinder, wherein the reverse spraying prevention cone head stretches into the T-shaped pipe (302), and the driving cylinder drives the reverse spraying prevention cone head and keeps a certain pressure to prop against the wood plug.
7. The chemical-mechanical pulp preparation process according to claim 5, characterized in that: the Gao Wensi device (4) comprises a side feeding conveying screw (401), a belt conveying screw (402), a Gao Wensi device (403), a spraying pipe (404), a cyclone separator (405) and a material plug conveying screw (406); the feed inlet of the side feed conveying screw (401) is connected with the expansion joint (305), the discharge outlet of the side feed conveying screw (401) is communicated with the belt conveying screw (402), and the screw diameter of the side feed conveying screw (401) is gradually reduced from the feed inlet to the discharge outlet; a belt conveyor screw (402); the band conveying screw (402) sends the steamed wood chips into a Gao Wensi converting machine (403), and the steamed wood chips are kneaded and filamentized into paper pulp in the Gao Wensi converting machine (403); the outlet of the Gao Wensi machine (403) is communicated with a cyclone separator (405) through a blow pipe (404), the cyclone separator (405) separates paper pulp from steam, the paper pulp is discharged into a plug conveying screw (406), and the plug conveying screw (406) conveys and compacts the paper pulp and then discharges the paper pulp to high-concentration reaction equipment; steam is discharged from the cyclone separator (405) and is led to the steaming bin (102) by a reflux steam pipe.
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| CN117245751B (en) * | 2023-10-16 | 2024-05-10 | 浙江顺威新材料有限公司 | Density board raw material treatment equipment |
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| CN114318918A (en) | 2022-04-12 |
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