CN112359630A - Wood chip treatment method, wood chip treatment system and chemi-mechanical pulp product - Google Patents
Wood chip treatment method, wood chip treatment system and chemi-mechanical pulp product Download PDFInfo
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- CN112359630A CN112359630A CN202011050725.3A CN202011050725A CN112359630A CN 112359630 A CN112359630 A CN 112359630A CN 202011050725 A CN202011050725 A CN 202011050725A CN 112359630 A CN112359630 A CN 112359630A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/12—Impregnating by coating the surface of the wood with an impregnating paste
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Abstract
The application discloses a wood chip treatment method, a wood chip treatment system and a chemi-mechanical pulp product, which are used for treating wood chips before pulping, wherein the wood chip treatment method comprises the following steps: spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe; the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of the fiber cell walls of the wood chips become loose, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed. By the mode, the fiber cells in the wood chips can be easily separated from other cells, so that energy consumption in fiber cell tearing and pulp grinding procedures can be reduced, the number of capillary pores of the fiber cells is increased, permeation of chemicals is facilitated, the reaction rate of chemical auxiliaries can be increased, the utilization rate of the chemicals is increased, energy can be saved, consumption can be reduced, corresponding cost can be saved, and production benefits can be improved.
Description
Technical Field
The application relates to the technical field of pulping and papermaking processes, in particular to a wood chip treatment method, a wood chip treatment system and a chemi-mechanical pulp product.
Background
Nowadays, as the requirements of people on the quality (strength, whiteness and printability) of paper pulp are continuously improved, the development requirements of the pulping and papermaking industry on pulping processes and manufacturing equipment are higher and higher. Compared with the traditional chemical pulp product, the chemi-mechanical pulp can more effectively utilize fiber raw materials, the consumption of raw materials of each ton of pulp is only about half of that of the chemical pulp, and the water consumption of each ton of pulp is lower; toxic chemicals are not needed in the corresponding production process, the generation of liquid with pollution and toxicity to the atmosphere, such as stink, dust and the like, can be effectively avoided, and the method is more environment-friendly than the traditional sulfate pulp and is a pulping mode with very environmental protection and high pulp yield; compared with the same scale, the cost of building the plant is about half of that of chemical pulp.
However, in order to meet the demands of different customers in actual production, chemical-mechanical pulp with different qualities is usually required to be produced, and for pulp with higher quality, the pulp is mainly produced by increasing pulping chemicals, adjusting a pulping process and the like. However, increasing the amount of chemicals greatly increases the consumption of chemicals and the pulping cost, and the operation space for adjusting the pulping process is very limited.
Disclosure of Invention
The application provides a wood chip treatment method, a wood chip treatment system and a chemi-mechanical pulp product, which aim to solve the problems that in the production process of chemi-mechanical pulp in the prior art, the unit consumption of chemicals in pulp grinding is high, and the corresponding energy consumption and pulping cost are also high.
In order to solve the technical problem, the application adopts a technical scheme that: the method for treating wood chips is used for treating the wood chips before pulping, wherein the method for treating the wood chips comprises the following steps: spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe; the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of the fiber cell walls of the wood chips become loose, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
Wherein, before the step of spraying compound enzyme liquid medicine to the wood chip in at least one flow among wood chip screening, sampling and conveying through the liquid medicine shower, still include: the compound enzyme liquid medicine is prepared by adopting neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio.
Wherein the set mass ratio of the neutral xylanase, the neutral cellulase, the pectinase and the lipase in the compound enzyme liquid medicine is 3 (2.5-3:2) (2-2.5) to 1.5-2.5.
Wherein, after the step of adopting neutral xylanase, neutral cellulase, pectinase and lipase of setting for the mass ratio to prepare compound enzyme liquid medicine, before the step of spraying compound enzyme liquid medicine to the wood chip in at least one flow in wood chip screening, sample and conveying through the liquid medicine shower, still include: after the compound enzyme liquid medicine is diluted by adopting clear water with a set mass proportion, the liquid medicine is injected into a liquid medicine spray pipe.
Wherein the set mass ratio of the compound enzyme liquid medicine to the clear water is 1: (100-150).
Wherein, the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature so as to enable the internal tissues of the fiber cell walls of the wood chips to become loose, and the steps of decomposing and removing xylan, hemicellulose and pectin adhesive substances in the wood chips comprise the following steps: standing the wood chips sprayed with the compound enzyme liquid medicine at any temperature of 40-50 ℃ for a set time to enable internal tissues of fiber cell walls of the wood chips to become loose, and decomposing and removing xylan, hemicellulose and pectin adhesive substances of the wood chips.
Wherein the set time is not less than 48 hours.
Wherein, will spray the wood chip of compound enzyme liquid medicine and keep static for the set time under the preset temperature, so that the internal organization of the fiber cell wall of wood chip becomes lax, and decompose the step of removing xylan, hemicellulose and pectin bonding thing in the wood chip, still include: and (3) sequentially carrying out wood chip steam steaming and washing, spiral extrusion and tearing on the wood chips after standing, adding chemicals for reaction, carrying out high-concentration pulping and bleaching treatment, carrying out low-concentration pulping, washing, screening and concentrating pulp to obtain a corresponding chemi-mechanical pulp product.
In order to solve the above technical problem, the present application adopts another technical solution: providing a wood chip handling system, wherein the wood chip handling system comprises: a liquid medicine spraying pipe and a wood chip bin; the liquid medicine spraying pipe is arranged in parallel along the extending direction of at least one of the screening device, the sampling device and the conveying device of the wood chips, so that the wood chips are sprayed with the compound enzyme liquid medicine through the liquid medicine spraying pipe in at least one process of screening, sampling and conveying of the wood chips, the wood chips sprayed with the compound enzyme liquid medicine are conveyed to the wood chip bin through the conveying device, standing is carried out for set time at preset temperature, internal tissues of fiber cell walls of the wood chips are loosened, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
In order to solve the above technical problem, the present application adopts another technical solution: there is provided a chemi-mechanical pulp product, wherein the chemi-mechanical pulp product is made by a method for treating wood chips according to any of the above.
The beneficial effect of this application is: in contrast to the state of the art, the method for treating wood chips in the present application is used for treating wood chips before pulping, wherein the method for treating wood chips comprises: spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe; the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of fiber cell walls of the wood chips become loose, xylan, hemicellulose and pectin sticky matters in the wood chips are decomposed and removed, fiber cells in the wood chips can be easily separated from other cells, the fiber cell tearing and the energy consumption in a pulping process can be reduced, gaps are formed between primary walls and secondary walls of the fiber cells, the number of capillary holes is increased, the permeation of chemicals is facilitated, the reaction rate of other chemical additives can be increased, the utilization rate of the chemicals is increased, energy can be effectively saved, consumption can be effectively reduced, the using amount and cost of corresponding chemicals are saved, and the production benefit is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic flow diagram of a first embodiment of a method for treating wood chips according to the present application;
FIG. 2 is a schematic diagram of the structure of an embodiment of the cell wall of a wood chip;
FIG. 3 is a schematic flow diagram of a second embodiment of a method for treating wood chips according to the present application;
FIG. 4 is a schematic structural diagram corresponding to a specific application scenario of the wood chip treatment method of the present application;
FIG. 5 is a schematic structural diagram corresponding to a specific application scenario of a pulping process in the wood chip treatment method of the present application;
FIG. 6 is a schematic block diagram of a first embodiment of a wood chip handling system according to the present application;
fig. 7 is a schematic diagram of the construction of a second embodiment of the wood chip handling system of the present application.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present application clearer, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic flow diagram of a first embodiment of a method for treating wood chips according to the present application. The embodiment comprises the following steps:
s11: spraying complex enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe.
Specifically, before the chemical-mechanical pulp product is manufactured, the raw wood is firstly sliced into wood chips with approximately standard sizes, the wood chips are screened and sampled through a wood chip swing screen outlet section, a good chip sampling point outlet section and a wood chip mixing and conveying section respectively, so that off-specification wood chips are screened, the corresponding good chips are obtained and then conveyed to a wood chip bin in sequence for storage, and the good chips in storage are waited to be subjected to chemical adding, pulping and the like, so that the chemical-mechanical pulp product is manufactured.
Wherein, this wood chip sways sieve export section, good piece sampling point export section, wood chip mix transport section respectively corresponding to the corresponding device that links up in proper order of screening the wood chip, sample and mix transport processing, participate in each transport section in whole transport link respectively, and at wood chip sways sieve export section, good piece sampling point export section, at least one extending direction interval parallel arrangement in the wood chip mix transport section has the liquid medicine shower, and this liquid medicine shower is annotated the compound enzyme liquid medicine that has prepared in advance, with at least one flow in wood chip screening, sample and conveying to spray this compound enzyme liquid medicine to the wood chip.
S12: the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of the fiber cell walls of the wood chips become loose, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
Further, the wood chips sprayed with the compound enzyme liquid medicine are conveyed to a wood chip bin to be kept stand for a set time at a preset temperature.
The compound enzyme liquid medicine specifically comprises neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio, so that internal tissues of fiber cell walls of wood chips stored in a wood chip bin become loose, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
It can be understood that, as shown in fig. 2, fig. 2 is a schematic structural diagram of an example of the cell wall of the wood chip, wherein the cell wall of the wood chip is composed of a plurality of layers which are different in structure and chemical properties, and can be divided into the following three layers according to the formation sequence: the intercellular layer (Middle lamella), the Primary Wall (Primary Wall) and the Secondary Wall (Secondary Wall) can promote the cohesion of the fiber to be reduced when the compound enzyme liquid medicine acts on the wood chip, and separate the S1 layer and the S2 layer of the fiber cell Wall, so that the internal tissue structure of the fiber cell Wall becomes more loose, the fiber is easy to absorb water and swell and becomes soft, so that the fiber is easy to split when the wood chip is ground, the energy consumption of grinding is reduced, xylan, hemicellulose pectin caking matters and the like in the fiber raw material can be decomposed, the number of capillary pores of the wood chip is increased, the corresponding chemical permeation is facilitated, the reaction rate of other chemical additives is increased, the loss of cracks created by the chemical is reduced, in addition, the chromophoric groups containing carbonyl and carboxyl can be decomposed and damaged, and the yellowing degree of pulping is reduced, and simultaneously causes shrinkage of the resin to promote detachment of the resin from the adhered region of the cell wall. Namely, the energy conservation and consumption reduction can be effectively carried out on the subsequent pulping process, and the consumption and the cost of corresponding chemicals are saved, so that the production benefit is improved.
In contrast to the state of the art, the method for treating wood chips in the present application is used for treating wood chips before pulping, wherein the method for treating wood chips comprises: spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe; the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of fiber cell walls of the wood chips become loose, xylan, hemicellulose and pectin sticky matters in the wood chips are decomposed and removed, so that fiber cells in the corresponding wood chips can be easily separated from other cells, the fiber cell tearing and the energy consumption in a pulping process can be reduced, gaps can be formed between primary walls and secondary walls of the fiber cells, the number of capillary pores is increased, the permeation of chemicals is facilitated, the reaction rate of other chemical auxiliaries can be increased, the utilization rate of the chemicals is increased, the energy can be effectively saved, the consumption can be effectively reduced, the consumption and the cost of the corresponding chemicals can be saved, and the production benefit can be improved.
Referring to fig. 3, fig. 3 is a schematic flow diagram of a second embodiment of a method for treating wood chips according to the present application. The method for treating wood chips in the embodiment is a flow chart of a refinement embodiment of the method for treating wood chips in fig. 1, and comprises the following steps:
s31: the compound enzyme liquid medicine is prepared by adopting neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio.
Specifically, before spraying the compound enzyme liquid medicine on the wood chips, the compound enzyme liquid medicine is prepared by adopting neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio, for example, the corresponding neutral xylanase, neutral cellulase, pectinase and lipase are sequentially conveyed into a mixing tank through a medicine adding pump to be uniformly stirred and mixed, so that the compound enzyme liquid medicine is obtained.
Optionally, the set mass ratio of the neutral xylanase, the neutral cellulase, the pectinase and the lipase in the compound enzyme liquid medicine is 3 (2.5-3:2) to (2-2.5) to (1.5-2.5), which is not limited in the application.
S32: after the compound enzyme liquid medicine is diluted by adopting clear water with a set mass proportion, the liquid medicine is injected into a liquid medicine spray pipe.
Further, after the complex enzyme liquid medicine is prepared, the complex enzyme liquid medicine is diluted by using clear water with a set mass proportion, for example, the clear water is added into a mixing tank storing the complex enzyme liquid medicine according to a proportion for dilution, and the mixed solution is injected into a liquid medicine spraying pipe after being stirred and mixed uniformly. In other embodiments, the complex enzyme liquid medicine can be prepared by directly using solutions of corresponding components, so that the complex enzyme liquid medicine meeting the requirements can be directly injected into the liquid medicine spray pipe.
Optionally, the set mass ratio of the compound enzyme liquid medicine to the clear water is 1: (100-150), which is not limited in this application.
S33: spraying complex enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe.
Specifically, the compound enzyme liquid medicine is sprayed on the corresponding wood chips in at least one process of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe filled with the compound enzyme liquid medicine.
Optionally, at least two spray heads are arranged on the extension direction of the liquid medicine spray pipe at intervals, and the spray heads are shower spray heads so as to uniformly spray the compound enzyme liquid medicine on the surface of the wood chips in a spray manner.
The spray heads are arranged on the liquid medicine spray pipe at any reasonable distance of 10-15cm, the extension direction of the spray heads is consistent with the conveying direction of the wood chips, and the wood chips are conveyed by the corresponding wood chip conveying belts at a uniform speed, so that the wood chips can be uniformly sprayed by the compound enzyme liquid medicine as far as possible.
Optionally, before the wood chips enter the wood chip bin, the total amount of spraying the liquid medicine on the wood chips is 200-500 g/ton of oven-dried wood chips, which is not limited in the application.
In a specific embodiment, the prepared compound enzyme liquid medicine is respectively injected into a first liquid medicine spray pipe, a second liquid medicine spray pipe and a third liquid medicine spray pipe which are mutually independent, wherein the liquid medicine spraying pipe, the second liquid medicine spraying pipe and the third liquid medicine spraying pipe are respectively arranged at the corresponding positions of the outlet section of the wood chip swing sieve, the outlet section of the good piece sampling point and the wood chip mixing and conveying section at intervals in parallel, and the extension direction of the liquid medicine spraying pipe, the second liquid medicine spraying pipe and the third liquid medicine spraying pipe is consistent with the conveying direction of the corresponding wood chips, the wood chips falling from the outlet of the outlet section of the wood chip swing screen can be uniformly sprayed with the complex enzyme liquid medicine through the first liquid medicine spraying pipe, and uniformly spraying the complex enzyme liquid medicine again on the conveyed wood chips at the outlet section of the good chip sampling point through a second liquid medicine spraying pipe, and further uniformly spraying the complex enzyme liquid medicine again on the conveyed wood chips at the wood chip mixing and conveying section through a third liquid medicine spraying pipe.
S34: standing the wood chips sprayed with the compound enzyme liquid medicine at any temperature of 40-50 ℃ for a set time to enable internal tissues of fiber cell walls of the wood chips to become loose, and decomposing and removing xylan, hemicellulose and pectin adhesive substances of the wood chips.
Further, the wood chips sprayed with the compound enzyme liquid medicine are conveyed to a wood chip bin to be kept stand for a set time at any temperature of 40-50 ℃ so as to ensure that the compound enzyme liquid medicine can fully react with the wood chips, thus internal tissues of fiber cell walls of the wood chips become loose, and xylan, hemicellulose and pectin adhesive substances of the wood chips are decomposed and removed.
Optionally, the set time is one of any reasonable time of not less than 48 hours, which is not limited in this application.
S35: and (3) sequentially carrying out wood chip steam steaming and washing, spiral extrusion and tearing on the wood chips after standing, adding chemicals for reaction, carrying out high-concentration pulping and bleaching treatment, carrying out low-concentration pulping, washing, screening and concentrating pulp to obtain a corresponding chemi-mechanical pulp product.
Specifically, wood chips which are pretreated by compound enzyme liquid medicine and are stood are conveyed to a pulping workshop through a conveying belt so as to be sequentially subjected to wood chip steam steaming and washing, spiral extrusion and tearing, chemical products are added for reaction, high-concentration pulping and bleaching treatment are performed, then low-concentration pulping is performed, pulp is washed, screened and concentrated, and finally a chemical-mechanical pulp product with qualified quality is prepared.
Therefore, the process of the wood chip treatment method in the embodiment is simple, the operation is convenient, and the optimal activity condition of the complex enzyme liquid medicine is a low-temperature environment of 40-50 ℃ and needs longer reaction time (more than 48 h), so the complex enzyme liquid medicine is optimally added for pretreatment in the wood chip conveying and storage stages, the activity of the complex enzyme liquid medicine can be exerted to the maximum extent, the utilization rate of the complex enzyme liquid medicine is greatly improved, the wood chips are pretreated by adding a small amount of the complex enzyme liquid medicine, the optimal wood chip softening and loosening effect can be achieved, the grinding energy consumption is effectively reduced, the using amount and the cost of the complex enzyme liquid medicine can be effectively reduced, and the corresponding production benefit is improved.
In addition, when the compound enzyme liquid medicine is added in the wood chip storage working section for pretreatment, the xylanase, the cellulase, the pectinase and the lipase in the compound enzyme can decompose and remove xylan, hemicellulose, pectin bonding substances and other substances in the wood chip fiber raw material in advance, so that the influence of organic substances such as pectin resin and the like on the consumption of pulping chemicals in the later stage and the quality of pulp is avoided, the load of pulping waste water is reduced, and the waste water treatment cost is reduced. When the complex enzyme liquid medicine is added in the back section (pulping section) for treatment, the pulping section generally has higher temperature and short retention time, so that the maximum activity of the complex enzyme liquid medicine is not favorably exerted, the pretreatment effect of the wood chips is greatly reduced, and the expected effect can be achieved only by increasing the using amount of the complex enzyme liquid medicine, so that the treatment cost of the complex enzyme liquid medicine is increased, and the production benefit is not favorably improved.
In a specific embodiment, as shown in fig. 4, fig. 4 is a structural schematic diagram corresponding to a specific application scenario of the method for treating wood chips of the present application, and the method comprises the steps of firstly preparing a complex enzyme liquid medicine by using neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio, adding clear water in a proportion of 100-150 times of the complex enzyme liquid medicine, diluting the complex enzyme liquid medicine, injecting the diluted complex enzyme liquid medicine into a corresponding liquid medicine spray pipe, uniformly spraying the diluted complex enzyme liquid medicine on the wood chips sequentially passing through a swing sieve outlet, a good chip outlet and a mixed conveyer belt through the liquid medicine spray pipe, conveying the wood chips to a wood chip bin, standing the wood chips at any temperature of 40-50 ℃ for not less than 48 hours, and conveying the wood chips to a pulping workshop for pulping.
As shown in fig. 5, fig. 5 is a schematic structural diagram corresponding to a specific application scenario of a pulping process in the method for processing wood chips according to the present application, after the wood chips processed and stood by the complex enzyme liquid medicine are conveyed to a pulping workshop, wood chips are subjected to wood chip steam steaming and washing in sequence, screw extrusion and tearing are performed on the wood chips, chemicals are added to perform reaction and stay, high-concentration pulping and bleaching are performed, then low-concentration pulping is performed, pulp washing, screening and concentration are performed, and finally, a chemical-mechanical pulp product with qualified quality is prepared and stored.
Wherein, the treatment process from the screw extrusion to the high-concentration bleaching of the corresponding wood chips needs to be sequentially added with corresponding chemicals for reaction, so that the internal organization structure of the fiber cell walls of the wood chips treated by the compound enzyme liquid is more relaxed, the fibers are easy to absorb water and swell and are soft, so that the wood chips are easier to split when the wood chips are ground, the energy consumption of the grinding is reduced, the compound enzyme liquid can also decompose xylan, hemicellulose pectin agglutinates and the like in fiber raw materials, and the number of capillary pores of the wood chips is increased, so that the penetration of the chemicals added at this time is facilitated, the reaction rate of other chemical additives can be improved, the loss of cracks created by the chemicals can be reduced, and chromophoric groups containing carbonyl and carboxyl can be decomposed and damaged, thereby reducing the yellowing of the pulp and, at the same time, causing the resin to shrink, thereby forcing the resin to detach from the adhered areas of the cell walls. Namely, the energy conservation and consumption reduction can be effectively carried out on the subsequent pulping process, and the consumption and the cost of corresponding chemicals are saved, so that the corresponding production benefit is improved.
With the above method of treatment of wood chips, pilot tests have been successfully carried out on site, with the following parameters relevant to the conditions of the site tests:
the field test data are as follows:
remarking: 5 months and 4 days, 7:30-9:00, and the spiral blockage is induced to stop, so that the data of the day is removed.
1. According to statistics of the test data, the average power consumption of the wood chip enzyme in the test period is 941kwh/adt, the average power consumption of the control period is 978kwh/adt, and the power consumption of each ton of pulp is saved by 37 kwh/adt. The dosage of other main chemical drugs and the quality of the formed pulp are relatively stable.
2. The annual benefit is 900 ten thousand yuan/year.
Based on the general inventive concept, the present application also provides a system for treating wood chips, and referring to fig. 6, fig. 6 is a schematic structural view of a first embodiment of the system for treating wood chips according to the present application. The wood chip handling system 61 in this embodiment includes a chemical spray pipe 611 and a wood chip bin 615.
The liquid medicine spraying pipes 611 are arranged in parallel and at intervals along the extending direction of at least one of the screening device 612, the sampling device 614 and the conveying device 613, so that the wood chips subjected to the pulping treatment can be sprayed with the prepared compound enzyme liquid medicine through the liquid medicine spraying pipes 611 in at least one process of screening, sampling and conveying of the wood chips, the wood chips sprayed with the compound enzyme liquid medicine are conveyed into the wood chip bin 615 through the conveying device 613, standing is carried out for a set time at a preset temperature, internal tissues of fiber cell walls of the wood chips are loosened, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
Referring to fig. 7, fig. 7 is a schematic structural view of a second embodiment of a wood chip treatment system according to the present application. The system for treatment of wood chips in this embodiment differs from the first embodiment of the system for treatment of wood chips in fig. 6 in that the system for treatment of wood chips 61 further comprises a mixing tank 616.
The mixing tank 616 is specifically used for mixing neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio to prepare corresponding complex enzyme liquid medicine, and clear water in a set mass ratio can be added to dilute the complex enzyme liquid medicine.
Based on the general inventive concept, there is also provided a chemi-mechanical pulp product, wherein the chemi-mechanical pulp product is produced by a method for treating wood chips as defined in any of the above.
In contrast to the state of the art, the method for treating wood chips in the present application is used for treating wood chips before pulping, wherein the method for treating wood chips comprises: spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying the wood chips through a liquid medicine spraying pipe; the wood chips sprayed with the compound enzyme liquid medicine are kept stand for a set time at a preset temperature, so that the internal tissues of fiber cell walls of the wood chips become loose, xylan, hemicellulose and pectin sticky matters in the wood chips are decomposed and removed, so that fiber cells in the corresponding wood chips can be easily separated from other cells, the fiber cell tearing and the energy consumption in a pulping process can be reduced, gaps can be formed between primary walls and secondary walls of the fiber cells, the number of capillary pores is increased, the permeation of chemicals is facilitated, the reaction rate of other chemical auxiliaries can be increased, the utilization rate of the chemicals is increased, the energy can be effectively saved, the consumption can be effectively reduced, the consumption and the cost of the corresponding chemicals can be saved, and the production benefit can be improved.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. A method for treating wood chips prior to pulping, the method comprising:
spraying a compound enzyme liquid medicine to the wood chips in at least one flow of screening, sampling and conveying of the wood chips through a liquid medicine spraying pipe;
standing the wood chips sprayed with the compound enzyme liquid for a set time at a preset temperature so as to enable internal tissues of fiber cell walls of the wood chips to become loose, and decomposing and removing xylan, hemicellulose and pectin bonding substances in the wood chips.
2. The method for treating wood chips according to claim 1, further comprising the step of spraying a complex enzyme solution to the wood chips in at least one of the steps of screening, sampling and conveying the wood chips by a solution spraying pipe, before the step of spraying the complex enzyme solution to the wood chips:
the compound enzyme liquid medicine is prepared by adopting neutral xylanase, neutral cellulase, pectinase and lipase in a set mass ratio.
3. The method for treating wood chips according to claim 2,
the set mass ratio of the neutral xylanase, the neutral cellulase, the pectinase and the lipase in the compound enzyme liquid medicine is 3 (2.5-3:2) (2-2.5) to 1.5-2.5.
4. The method for treating wood chips according to claim 2, wherein after the step of preparing the complex enzyme solution using the neutral xylanase, the neutral cellulase, the pectinase and the lipase in the predetermined mass ratio, the method further comprises, before the step of spraying the complex enzyme solution to the wood chips in at least one of the processes of screening, sampling and conveying the wood chips by a solution spraying pipe, the steps of:
and diluting the compound enzyme liquid medicine by using clear water with a set mass ratio, and injecting the diluted compound enzyme liquid medicine into the liquid medicine spray pipe.
5. The method for treating wood chips according to claim 4,
the set mass ratio of the compound enzyme liquid medicine to the clear water is 1: (100-150).
6. The method for treating wood chips according to claim 1, wherein the step of allowing the wood chips sprayed with the complex enzyme solution to stand at a predetermined temperature for a predetermined time to loosen the inner tissues of the fiber cell walls of the wood chips and decompose and remove xylan, hemicellulose and pectin adhesions in the wood chips comprises:
standing the wood chips sprayed with the compound enzyme liquid medicine at any temperature of 40-50 ℃ for the set time to enable internal tissues of fiber cell walls of the wood chips to become loose, and decomposing and removing xylan, hemicellulose and pectin adhesive substances of the wood chips.
7. The method for treating wood chips according to claim 1,
the set time is not less than 48 hours.
8. The method for treating wood chips according to claim 1, wherein the step of allowing the wood chips sprayed with the complex enzyme solution to stand at a predetermined temperature for a predetermined time to loosen the inner tissues of the fiber cell walls of the wood chips and decompose and remove xylan, hemicellulose and pectin adhesions in the wood chips further comprises:
and (3) sequentially carrying out wood chip steam steaming and washing, spiral extrusion and tearing on the wood chips after standing, adding chemicals for reaction, carrying out high-concentration pulping and bleaching treatment, carrying out low-concentration pulping, washing, screening and concentrating pulp to obtain a corresponding chemi-mechanical pulp product.
9. A system for the treatment of wood chips, characterized in that the system for the treatment of wood chips comprises: a liquid medicine spraying pipe and a wood chip bin;
the liquid medicine spraying pipes are arranged in parallel at intervals along the extending direction of at least one of the screening device, the sampling device and the conveying device of the wood chips, so that the wood chips are sprayed with the compound enzyme liquid medicine through the liquid medicine spraying pipes in at least one process of screening, sampling and conveying of the wood chips, the wood chips sprayed with the compound enzyme liquid medicine are conveyed into the wood chip bin through the conveying device, standing is carried out for a set time at a preset temperature, internal tissues of fiber cell walls of the wood chips are loosened, and xylan, hemicellulose and pectin adhesive substances in the wood chips are decomposed and removed.
10. A chemi-mechanical pulp product, characterized in that it is produced by a method for the treatment of wood chips according to any of claims 1-8.
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