CN113341778A - Method for performing online control on wheat straw pulping by using fitting equation - Google Patents
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Abstract
The invention belongs to the technical field of biology, and discloses a method for performing online control on wheat straw pulping by using a fitting equation, which comprises the following steps: changing technological parameters in the pulping process to obtain different pulping degrees; simultaneously measuring the contents of reducing sugar and soluble solid; fitting the content of reducing sugar and the numerical value of the beating degree to establish a fitting equation 1; or fitting the content of the soluble solid matter and the numerical value of the beating degree to establish a fitting equation 2; and (3) testing the content of reducing sugar or soluble solid in the slurry to be tested, and predicting the beating degree by utilizing a fitting equation 1 or a fitting equation 2. The method has the advantages that the content of the reducing sugar and the content of the soluble solid matter are utilized to establish a fitting equation, the content of the reducing sugar and the content of the soluble solid matter are utilized to reflect the beating degree of the pulping, the performance in the pulping process can be rapidly detected, the pulping efficiency is improved, the online control of the pulping process is realized, and the manpower consumption is reduced.
Description
Technical Field
The invention belongs to the field of biotechnology, and relates to a mode for realizing online control of wheat straw pulping by utilizing the relation between an index capable of being quickly detected and the pulping degree.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In recent years, the demand for paper and paperboard has been high, but the development of the paper industry is limited by the shortage of paper making raw materials. The capacity of pulp, especially wood pulp, is not sufficient to compensate for the high import dependence of paper stock. Wheat straw is an important biomass source as a gramineous plant, is widely planted worldwide and is one of three grains in the world. The wheat straw used as agricultural waste can reduce environmental pollutants and maximize straw resources when used as paper pulp. The enzyme preparation is used for treating the pulping raw materials, the reaction process is simple and controllable, and the performance indexes for industrially judging whether the paper pulp can be used for papermaking are many, including: freeness, tensile index, tear index, folding endurance, whiteness, and brightness, among others. However, the inventor finds that: in actual production, because the method for testing the beating degree is relatively complicated, the rapid detection and the on-line control of the beating degree in the pulping process are difficult to realize, and the labor consumption is large.
Disclosure of Invention
In order to improve the pulping efficiency of a factory, the method combines a certain index in the pulped pulp with the pulping degree, explores the rule of index change and the pulping degree change, describes the change of the index and the pulping degree through a fitting equation, preliminarily determines to carry out nonlinear fitting by utilizing the content change of reducing sugar and soluble solid matters and the change of the pulping degree, and realizes the online control of biological pulping.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a method for performing wheat straw pulping on-line control by using a fitting equation, which comprises the following steps:
changing technological parameters in the pulping process to obtain different pulping degrees; simultaneously measuring the contents of reducing sugar and soluble solid;
fitting the content of reducing sugar and the numerical value of the beating degree to establish a fitting equation 1;
or fitting the content of the soluble solid matter and the numerical value of the beating degree to establish a fitting equation 2;
and (3) testing the content of reducing sugar or soluble solid in the slurry to be tested, and predicting the beating degree by utilizing a fitting equation 1 or a fitting equation 2.
Through systematic research and experimental investigation, the invention selects the beating degree as a performance index, and simultaneously selects two reducing sugar contents which are easy to be measured and the soluble solid content and the beating degree to establish a fitting equation.
In a second aspect of the present invention, there is provided a system for performing online control of wheat straw pulping by using a fitting equation, comprising:
the test module is used for testing different pulping degrees, reducing sugar contents and soluble solid contents which are obtained under different process parameters in the pulping process;
the first fitting module is used for fitting the content of reducing sugar and the numerical value of the beating degree to establish a fitting equation 1;
and/or a second fitting module for fitting the content of the soluble solid matter and the numerical value of the beating degree to establish a fitting equation 2;
and the prediction module is used for testing the content of reducing sugar or soluble solid in the slurry to be tested, and predicting the beating degree by utilizing a fitting equation 1 or a fitting equation 2.
In a third aspect of the present invention, a controller for performing online control of wheat straw pulping by using a fitting equation is provided, and the controller is configured to execute the steps of any one of the above-mentioned methods for performing online control of wheat straw pulping by using a fitting equation, and based on the determined operational parameters of the methods.
The invention has the beneficial effects that:
(1) according to the invention, a fitting equation is established by utilizing the content of the reducing sugar and the content of the soluble solid matter and the beating degree, and the beating degree of the pulping is reflected by utilizing the content of the reducing sugar and the content of the soluble solid matter, so that the performance in the pulping process can be rapidly detected, the pulping efficiency is improved, the online control of the pulping process is realized, and the consumption of manpower is reduced. Meanwhile, an idea is provided for detecting and controlling other properties of the pulp.
(2) The operation method is simple, low in cost, universal and easy for large-scale production.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
(1) placing the naturally air-dried wheat straws and water in a water bath according to the ratio of 1:8 for 2h to carry out swelling treatment;
(2) adding 1.5% potassium hydroxide (KOH) solution for treatment, standing for 1h, and adjusting pH to neutral with phosphoric acid solution;
(3) under a neutral condition, adding a mixed solution of xylanase and pectinase at 80 ℃, wherein the adding ratio of the xylanase to the pectinase is 1:1, the adding amount is 10U/g absolute dry pulp, and reacting for 30 min;
(4) the treated sample was ground by a refiner at a number of revolutions set at 3000 r.
(5) Changing three parameters of revolution, KOH dosage and proportion of wheat straws and water to obtain different beating degrees, measuring the content of reducing sugar and soluble solid matters, and establishing a fitting equation.
(6) Establishment of beating degree and reducing sugar content fitting equation
Nonlinear fitting is performed on the content of reducing sugar and the numerical value of the beating degree by using MATLAB R2017a, and a fitting equation 1 conforming to Fourier transform distribution is obtained as follows:
f(x)＝822.8+1553*cos(x*5.464)+916.2*sin(x*5.464)+584.3*cos(2*x*5.464)+2019*sin(2*x*5.464)-1162*cos(3*x*5.464)+1696*sin(3*x*5.464)-1613*cos(4*x*5.464)+51.8*sin(4*x*5.464)-621.1*cos(5*x*5.464)-762*sin(5*x*5.464)+102*cos(6*x*5.464)-417.6*sin(6*x*5.464)+93.34*cos(7*x*5.464)-51.8*sin(7*x*5.464)
(7) establishment of beating degree and soluble solid fitting equation
The MATLAB R2017a is used for carrying out nonlinear fitting on the content of the soluble solids and the numerical value of the beating degree, and a fitting equation 2 conforming to Fourier transform distribution is obtained, and the following steps are carried out:
f(x)＝-3387+1894*cos(x*8.213)+6240*sin(x*8.213)+4649*cos(2*x*8.213)-3242*sin(2*x*8.213)-3667*cos(3*x*8.213)-2506*sin(3*x*8.213)-452*cos(4*x*8.213)+2940*sin(4*x*8.213)+1461*cos(5*x*8.213)-581.9*sin(5*x*8.213)-501.9*cos(6*x*8.213)-327.9*sin(6*x*8.213)+24.22*cos(7*x*8.213)+129.3*sin(7*x*8.213)
values of constants in the fitting equation for freeness and reducing sugar content at 195% confidence in the Table, and confidence limits
Values of constants in the fitted equation for freeness and soluble solids content at 295% confidence in the Table, and confidence limits
Example 2
When the content of reducing sugar is 2.2mg/mL, the beating degree predicted according to equation 1 is about 35.05 DEG SR, and the error from the actually measured value is 1.26%; at this time, the soluble solid content was 1.64%, and the degree of beating predicted according to equation 2 was about 35.57 ° SR, with an error of 0.20% from the actual value.
Example 3
When the content of reducing sugar is 1.75mg/mL, the beating degree predicted according to equation 1 is about 21.26 DEG SR, and the error from the actually measured value is 3.35%; at this time, the soluble solid content was 1.46%, and the degree of beating predicted according to equation 2 was about 22.57 ° SR, which is 2.61% error from the actual value.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for performing wheat straw pulping on-line control by using a fitting equation is characterized by comprising the following steps:
changing technological parameters in the pulping process to obtain different pulping degrees; simultaneously measuring the contents of reducing sugar and soluble solid;
fitting the content of reducing sugar and the numerical value of the beating degree to establish a fitting equation 1;
or fitting the content of the soluble solid matter and the numerical value of the beating degree to establish a fitting equation 2;
and (3) testing the content of reducing sugar or soluble solid in the slurry to be tested, and predicting the beating degree by utilizing a fitting equation 1 or a fitting equation 2.
2. The method for performing wheat straw pulping on-line control by using a fitting equation as claimed in claim 1, wherein the process parameters comprise: the number of grinding revolutions, the using amount of KOH and the proportion of the wheat straws and the water.
3. The method for performing online control on wheat straw pulping by using the fitting equation as claimed in claim 1, wherein the wheat straw is used as a raw material, and the swelling, the alkali solution treatment, the compound biological enzyme preparation treatment and the pulp grinding are sequentially performed to obtain the paper pulp.
4. The method for performing online control on wheat straw pulping by using a fitting equation as claimed in claim 1, wherein MATLAB R2017a is used for performing nonlinear fitting on the content of reducing sugar and the numerical value of beating degree to obtain the fitting equation 1 conforming to Fourier transform distribution.
5. The method for wheat straw pulping on-line control by using the fitting equation as claimed in claim 1, wherein the fitting equation 1 is
f(x)＝822.8+1553*cos(x*5.464)+916.2*sin(x*5.464)+584.3*cos(2*x*5.464)+2019*sin(2*x*5.464)-1162*cos(3*x*5.464)+1696*sin(3*x*5.464)-1613*cos(4*x*5.464)+51.8*sin(4*x*5.464)-621.1*cos(5*x*5.464)-762*sin(5*x*5.464)+102*cos(6*x*5.464)-417.6*sin(6*x*5.464)+93.34*cos(7*x*5.464)-51.8*sin(7*x*5.464)
f(x)＝822.8+1553*cos(x*5.464)+916.2*sin(x*5.464)+584.3*cos(2*x*5.464)+2019*sin(2*x*5.464)-1162*cos(3*x*5.464)+1696*sin(3*x*5.464)-1613*cos(4*x*5.464)+51.8*sin(4*x*5.464)-621.1*cos(5*x*5.464)-762*sin(5*x*5.464)+102*cos(6*x*5.464)-417.6*sin(6*x*5.464)+93.34*cos(7*x*5.464)-51.8*sin(7*x*5.464)。
6. The method for performing online control on wheat straw pulping by using a fitting equation as claimed in claim 1, wherein MATLAB R2017a is used for performing nonlinear fitting on the content of soluble solids and the numerical value of the pulping degree to obtain a fitting equation 2 conforming to Fourier transform distribution.
7. The method for wheat straw pulping on-line control by using the fitting equation as claimed in claim 1, wherein the fitting equation 2 is
f(x)＝-3387+1894*cos(x*8.213)+6240*sin(x*8.213)+4649*cos(2*x*8.213)-3242*sin(2*x*8.213)-3667*cos(3*x*8.213)-2506*sin(3*x*8.213)-452*cos(4*x*8.213)+2940*sin(4*x*8.213)+1461*cos(5*x*8.213)-581.9*sin(5*x*8.213)-501.9*cos(6*x*8.213)-327.9*sin(6*x*8.213)+24.22*cos(7*x*8.213)+129.3*sin(7*x*8.213)。
8. A system for performing wheat straw pulping on-line control by using a fitting equation is characterized by comprising the following steps:
the test module is used for testing different pulping degrees, reducing sugar contents and soluble solid contents which are obtained under different process parameters in the pulping process;
the first fitting module is used for fitting the content of reducing sugar and the numerical value of the beating degree to establish a fitting equation 1;
and/or a second fitting module for fitting the content of the soluble solid matter and the numerical value of the beating degree to establish a fitting equation 2;
and the prediction module is used for testing the content of reducing sugar or soluble solid in the slurry to be tested, and predicting the beating degree by utilizing a fitting equation 1 or a fitting equation 2.
9. The system for performing wheat straw pulping on-line control by using a fitting equation according to claim 8, wherein the process parameters comprise: the number of grinding revolutions, the using amount of KOH and the proportion of the wheat straws to the water;
or, taking wheat straws as a raw material, sequentially carrying out swelling, alkali solution treatment, compound biological enzyme preparation treatment and pulp grinding to obtain paper pulp;
or carrying out nonlinear fitting on the content of reducing sugar and the numerical value of the beating degree by using MATLAB R2017a to obtain a fitting equation 1 conforming to Fourier transform distribution; preferably, equation 1 is fitted to
f(x)＝822.8+1553*cos(x*5.464)+916.2*sin(x*5.464)+584.3*cos(2*x*5.464)+2019*sin(2*x*5.464)-1162*cos(3*x*5.464)+1696*sin(3*x*5.464)-1613*cos(4*x*5.464)+51.8*sin(4*x*5.464)-621.1*cos(5*x*5.464)-762*sin(5*x*5.464)+102*cos(6*x*5.464)-417.6*sin(6*x*5.464)+93.34*cos(7*x*5.464)-51.8*sin(7*x*5.464)。
Or, carrying out nonlinear fitting on the content of the soluble solids and the numerical value of the beating degree by using MATLAB R2017a to obtain a fitting equation 2 conforming to Fourier transform distribution; preferably, equation 2 is fitted to
f(x)＝-3387+1894*cos(x*8.213)+6240*sin(x*8.213)+4649*cos(2*x*8.213)-3242*sin(2*x*8.213)-3667*cos(3*x*8.213)-2506*sin(3*x*8.213)-452*cos(4*x*8.213)+2940*sin(4*x*8.213)+1461*cos(5*x*8.213)-581.9*sin(5*x*8.213)-501.9*cos(6*x*8.213)-327.9*sin(6*x*8.213)+24.22*cos(7*x*8.213)+129.3*sin(7*x*8.213)。
10. A controller for performing online control of wheat straw pulping using a fitted equation, wherein the controller is configured to perform the steps of the method for performing online control of wheat straw pulping using a fitted equation as claimed in any one of claims 1 to 7, and based on the determined operational parameters of the method.
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Cited By (4)
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| CN117390869A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Pulping process dynamics model taking reducing sugar content as parameter |
| CN117390868A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Dynamic model of pulping process taking content of soluble solids as parameter |
| CN117390870A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Pulping dynamics model based on reducing sugar and soluble solid content |
| CN117391471A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Wheat straw pulping beating degree fitting equation based on multiple factors |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117390869A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Pulping process dynamics model taking reducing sugar content as parameter |
| CN117390868A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Dynamic model of pulping process taking content of soluble solids as parameter |
| CN117390870A (en) * | 2023-10-25 | 2024-01-12 | 齐鲁工业大学(山东省科学院) | Pulping dynamics model based on reducing sugar and soluble solid content |
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| CN117390870B (en) * | 2023-10-25 | 2024-03-19 | 齐鲁工业大学(山东省科学院) | Pulping dynamics model based on reducing sugar and soluble solid content |
| CN117390868B (en) * | 2023-10-25 | 2024-03-22 | 齐鲁工业大学(山东省科学院) | Method for establishing dynamic model of pulping process by taking content of soluble solids as parameter |
| CN117390869B (en) * | 2023-10-25 | 2024-03-26 | 齐鲁工业大学(山东省科学院) | Pulping process dynamics model taking reducing sugar content as parameter |
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