Paper pulp sediment passivation anti-sticking method and system

Abstract

The invention relates to the technical field of pulping and papermaking, and discloses a paper pulp sediment passivation anti-sticking method, which comprises the following steps: detecting the concentration and flow of paper pulp in a pulp chest in real time, calculating the required adding amount of a bio-enzyme preparation according to the concentration and flow parameters of the paper pulp, conveying the bio-enzyme preparation into the pulp chest from a storage container through a metering pump, and feeding the bio-enzyme preparation into the pulp chest. The specificity of the biological enzyme is utilized to decompose ester bonds playing a role in adhesion in paper pulp sediments, so that the viscosity of the sediments is reduced, the sediments are passivated, the deposition, adhesion and reaggregation properties of the sediments are reduced, and the sediments are effectively inhibited from depositing on the surfaces of all systems of a paper machine; the method is high in automation degree, the addition of the biological enzyme preparation can be accurately controlled according to the real-time change of the production process, and the production stability and the product quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp and paper making, and particularly relates to a method and a system for passivating and anti-sticking of pulp deposits. Background Art

[0002] At present, waste paper, as a key source of secondary fibers, can effectively alleviate the contradiction between the shortage of papermaking fiber raw materials and energy shortage, and also helps to reduce the increasingly serious environmental pollution problems. However, during the process of waste paper recycling, various impurities such as adhesives, coating adhesives, and ink binders introduced in the production, processing, and use of paper will be released into the pulp and water system in large quantities, thus forming sticky substances; these sticky substances will bring extremely serious harm to the normal operation of the paper machine.

[0003] During the papermaking process, some impurities and minerals in the pulp may form deposits on the surface of papermaking equipment, affecting the paper quality and the operation efficiency of the equipment; therefore, to solve the above problems, we provide a method and a system for passivating and anti-sticking of pulp deposits, which can effectively solve these problems and improve the production efficiency and product quality. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for passivating and anti-sticking of pulp deposits, which can detect the concentration and flow rate of pulp in the pulp pool in real time, calculate the required dosage of the bio-enzyme preparation according to the pulp concentration and flow rate parameters, and then transport the bio-enzyme preparation from the storage container to the pulp pool through a metering pump.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A method for passivating and anti-sticking of pulp deposits includes the following steps: detecting the concentration and flow rate of pulp in the pulp pool in real time through a parameter detection module, and transmitting the detected data to a controller; the controller calculates the required dosage of the bio-enzyme preparation according to the received pulp concentration and flow rate parameters, and generates a corresponding control signal; the metering pump accurately adjusts the conveying flow rate according to this control signal, and transports the bio-enzyme preparation from the storage container to the pulp pool; then, the effect detection module detects the effect parameters of the pulp after being treated with the bio-enzyme preparation, transmits the detected treatment effect parameter data to the controller, and judges whether the treatment effect reaches the preset standard.

[0006] Optionally, the controller can also judge whether the received pulp concentration and flow rate parameters are within the preset parameter setting range. If not, an alarm signal is sent and the abnormal situation is recorded.

[0007] Optionally, if the treatment effect does not reach the preset standard, the calculation of the dosage of the bio-enzyme preparation is readjusted according to the deviation between the two, and the adjusted control signal is sent to the metering pump again.

[0008] Optionally, the relationship between the addition amount of the bio-enzyme preparation and the pulp concentration and flow rate is expressed by the following formula: Qm = k × C × Qp Wherein, Qm represents the addition amount of the bio-enzyme preparation, k is a comprehensive coefficient related to the activity of the bio-enzyme preparation, the pulp properties, and the production process requirements, C is the pulp concentration, and Qp is the pulp flow rate.

[0009] A pulp deposit passivation and anti-sticking system includes a parameter detection module, a controller, a metering pump, and an effect detection module, and the parameter detection module, the metering pump, and the effect detection module are all connected to the controller to execute the aforementioned pulp deposit passivation and anti-sticking method.

[0010] Optionally, the parameter detection module includes a concentration sensor and a flow sensor. The concentration sensor is installed inside the pulp conveying pipeline, and the flow sensor is installed on the pulp conveying pipeline.

[0011] Optionally, the effect detection module is arranged in the pulp pool or in subsequent process links.

[0012] Optionally, the effect parameters detected by the effect detection module include paper strength and whiteness.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In the present invention, by adding a bio-enzyme preparation into the pulp pool, using the specificity of the bio-enzyme, the ester bonds that play an adhesive role in the pulp deposits are decomposed, reducing the viscosity of the deposits, passivating the deposits, reducing their deposition, adhesion, and re-aggregation properties, and effectively inhibiting the formation of deposits on the surfaces of various systems of the paper machine; (2) In the present invention, according to the pulp concentration and flow rate parameters, the required addition amount of the bio-enzyme preparation is calculated, and then the bio-enzyme preparation is transported from the storage container to the pulp pool through a metering pump to decompose the ester bonds that play an adhesive role in the deposits, and determine whether the treatment effect reaches a preset standard; this method has a high degree of automation, can accurately control the addition of the bio-enzyme preparation according to the real-time changes in the production process, and improves the production stability and product quality. Description of the Drawings

[0014] Figure 1 is a flow schematic diagram of the pulp deposit passivation and anti-sticking method in an embodiment of the present invention; Figure 2 is a structural schematic diagram of the pulp deposit passivation and anti-sticking system in an embodiment of the present invention; Detailed Embodiments

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0016] Embodiment 1, as Figure 1 shown, a method for passivating and anti - sticking of pulp deposits includes the following steps.

[0017] S1. The parameter detection module real - time detects the concentration and flow rate parameters of the pulp in the pulp pool, and transmits the detected parameter data to the controller. The parameter detection module includes a concentration sensor and a flow sensor arranged in the pulp pool, which are used to real - time detect the concentration and flow rate parameters of the pulp.

[0018] S2. The controller calculates the required addition amount of the bio - enzyme preparation according to the received pulp concentration and flow rate parameter data, and generates a corresponding control signal. The controller is communicatively connected to the parameter detection module and is used to receive the pulp concentration and flow rate parameter data transmitted by the parameter detection module.

[0019] The algorithm and parameter setting range for the addition amount of the bio - enzyme preparation required for the papermaking production process are preset in the controller. The controller can calculate the required addition amount of the bio - enzyme preparation according to the received pulp concentration and flow rate parameter data according to the preset algorithm, and generate a corresponding control signal.

[0020] The controller can also judge whether the received pulp concentration and flow rate parameters are within the preset parameter setting range. If not, it issues an alarm signal and records the abnormal situation.

[0021] S3. The metering pump is communicatively connected to the controller to receive the control signal issued by the controller, and accurately adjusts the delivery flow rate according to this control signal, and transports the bio - enzyme preparation from the storage container to the pulp pool. After being stirred and mixed by the impeller in the pulp pool, the bio - enzyme preparation is fully mixed with the pulp. Here, the bio - enzyme preparation uses a deposit - control enzyme to passivate the deposits, making the deposits lose stickiness and effectively inhibiting the formation of deposits on the surface of the paper machine flow - sending system.

[0022] Among them, the storage container of the bio - enzyme preparation is usually selected according to factors such as the characteristics of the enzyme, storage requirements, and usage scenarios, including but not limited to plastic containers, glass containers, stainless - steel containers, and ceramic containers.

[0023] S4. The effect detection module detects the effect parameters of the pulp after being treated with the bio-enzyme preparation, determines whether the treatment effect meets the preset standard, and transmits the detected treatment effect parameter data to the controller. The effect detection module is set in the pulp pool or subsequent process links, and is used to detect the effect parameters of the pulp after being treated with the bio-enzyme preparation, such as paper strength, whiteness, etc., and transmit the detected treatment effect parameter data to the controller.

[0024] Among them, the controller is also communicatively connected to the effect detection module, receives the treatment effect parameter data transmitted by the effect detection module, and determines whether the treatment effect meets the preset standard. If it does not meet the preset standard, the calculation of the bio-enzyme preparation addition amount is readjusted according to the deviation between the treatment effect and the preset standard, and the adjusted control signal is sent to the metering pump again.

[0025] This method calculates the required addition amount of the bio-enzyme preparation according to the pulp concentration and flow parameters, then transports the bio-enzyme preparation from the storage container to the pulp pool through the metering pump, decomposes the ester bonds that play an adhesive role on the sediment, and determines whether the treatment effect meets the preset standard. This method has a high degree of automation, can accurately control the addition of the bio-enzyme preparation according to the real-time changes in the production process, and improves the production stability and product quality.

[0026] And this method adds the bio-enzyme preparation to the pulp pool, utilizes the specificity of the bio-enzyme to decompose the ester bonds that play an adhesive role in the pulp sediment, reduces the viscosity of the sediment, passivates the sediment and reduces its deposition, adhesion and re-aggregation properties, and effectively inhibits the formation of sediment on the surfaces of various systems of the paper machine.

[0027] Furthermore, the relationship between the addition amount of the bio-enzyme preparation and the pulp concentration and flow rate is expressed by the following formula: Qm = k × C × Qp Among them, Qm represents the addition amount of the bio-enzyme preparation, unit: kg / hour; k is a comprehensive coefficient, which is related to various factors such as the activity of the bio-enzyme preparation, the pulp characteristics, and the production process requirements, and needs to be determined through experiments and production experience. For example, for bio-enzyme preparations with higher activity, the value may be relatively small; for the production of special paper grades with higher requirements for bio-enzyme treatment, the value may be appropriately increased; C is the pulp concentration, unit: %, which refers to the percentage of the content of solid substances such as fibers in the pulp in the total pulp; Qp is the pulp flow rate, unit: m³ / hour, which represents the amount of pulp passing through a certain position per unit time.

[0028] As shown by the above formula, the addition amount of the bio-enzyme preparation is directly proportional to the pulp concentration and pulp flow rate. The higher the pulp concentration or the greater the pulp flow rate, the more bio-enzyme preparation is required. However, in practical applications, factors such as the cost of the bio-enzyme preparation and the marginal benefit of the treatment effect also need to be considered, and the calculated addition amount should be appropriately adjusted and optimized.

[0029] As mentioned above, in experimental and production experience, the value of k in the calculation formula Qm = k×C×Qp for the addition amount of bio-enzyme preparation varies greatly due to various factors. The following are the ranges of k values and related explanations under different papermaking scenarios.

[0030] (1) Taking the treatment of chemical pulp as an example: If xylanase is used for pretreatment to assist in delignification, under the condition of a pulp concentration of 3% - 5%, when the activity of the bio-enzyme preparation is about 5000 IU / g, the value of k is usually between 0.001 and 0.003. If the activity of the bio-enzyme preparation is increased to 10000 IU / g, the value of k will decrease to 0.0005 - 0.0015.

[0031] For the case of using cellulase to improve the fiber properties of chemical pulp, when the pulp concentration is 4% - 6% and the activity of cellulase is 8000 IU / g, the value of k is between 0.0012 and 0.0025.

[0032] (2) For the treatment of mechanical pulp: Using hemicellulase to improve the drainability of mechanical pulp, within the range of a pulp concentration of 8% - 12%, when the enzyme activity is 6000 U / mL, the value of k is generally between 0.0015 and 0.004.

[0033] If laccase is used to improve the whiteness of mechanical pulp, under the condition of a pulp concentration of about 10% and a laccase activity of 4000 U / L, the value of k is between 0.002 and 0.005.

[0034] (3) For the treatment of waste paper pulp: Using deinking enzyme to deink waste paper pulp, when the pulp concentration is 12% - 15% and the activity of the deinking enzyme is 15000 IU / g, the value of k is between 0.0025 and 0.006.

[0035] For the case of using fiber cutting enzyme to adjust the fiber length of waste paper pulp, when the pulp concentration is 10% - 14% and the enzyme activity is 10000 U / mL, the value of k is usually between 0.002 and 0.0045.

[0036] Example 2: On the basis of Example 1, the present invention also proposes the relevant structure of the pulp deposit passivation and anti-sticking system.

[0037] Such as Figure 2As shown in the figure, a pulp deposit passivation and anti-sticking system includes a parameter detection module, a controller, a metering pump, and an effect detection module. The parameter detection module, the metering pump, and the effect detection module are all communicatively connected to the controller to execute the aforementioned pulp deposit passivation and anti-sticking method.

[0038] As mentioned above, the parameter detection module includes a concentration sensor and a flow sensor. The former is installed in the pulp tank or the pulp conveying pipeline, and the latter is installed inside the pulp conveying pipeline.

[0039] The concentration sensor can adopt existing ultrasonic concentration sensors, optical concentration sensors, or capacitive concentration sensors, and is installed on the pulp tank or the pulp conveying pipeline to achieve real-time monitoring of the pulp concentration and transmit the concentration data to the controller.

[0040] The flow sensor can adopt electromagnetic flow meters, turbine flow meters, or ultrasonic flow meters, and is installed inside the pulp conveying pipeline to measure the pulp flow rate in real time and transmit the flow data to the controller.

[0041] Furthermore, the effect detection module is set in the pulp tank or subsequent process links, and is used to detect the effect parameters of the pulp after being treated with the biological enzyme preparation, such as paper strength, whiteness, etc., and transmit the detected treatment effect parameter data to the controller; after receiving the data transmitted by it, the controller makes a judgment. If the preset standard is not reached, according to the deviation between the treatment effect and the preset standard, the calculation of the addition amount of the biological enzyme preparation is readjusted, and the adjusted control signal is sent to the metering pump again.

[0042] This structure can form a feedback system within the pulp deposit passivation and anti-sticking system to ensure the effect of pulp deposit passivation and anti-sticking.

[0043] Among them, when the effect detection module is installed in the pulp tank, the effect detection module can adopt an on-line water quality analyzer to monitor the water quality parameters in the papermaking process in real time; when the effect detection module is installed in subsequent process links, the effect detection module can adopt equipment such as paper sheet performance detection equipment, fiber analyzers, and particle size analyzers.

[0044] Workflow: The sensors detect the pulp parameters (such as concentration, flow rate, etc.) in real time; the controller judges whether the parameters are within the set range. If not, it issues an alarm and records the abnormality, and continues to detect; if the parameters are normal, the controller calculates the addition amount of the biological enzyme preparation according to the preset algorithm and sends a control signal to the metering pump; the metering pump transports the biological enzyme preparation to the pulp tank, and after stirring and mixing, the treatment effect of the pulp is detected again; it is judged whether the treatment effect meets the standard. If it meets the standard, the process ends; if it does not meet the standard, the controller adjusts the calculation of the enzyme addition amount and performs the addition operation again.

[0045] In summary, the present invention combines sensors, controllers, metering devices, etc., and can automatically control the addition amount of the biological enzyme preparation according to relevant parameters in the pulp pond (such as pulp concentration, flow rate, etc.). By utilizing the specificity of the biological enzyme, the ester bonds that play an adhesive role in the pulp sediment can be decomposed, reducing the viscosity of the sediment, passivating the sediment, reducing its deposition, adhesion, and re-aggregation properties, and effectively inhibiting the formation of sediment on the surfaces of various systems of the paper machine. Moreover, the addition of the biological enzyme preparation is precisely controlled according to the real-time changes in the production process, improving the production stability and product quality.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0048] Based on the inspiration of the ideal embodiments of the present invention as described above, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A pulp sediment passivation and anti-sticking method, characterized in that: The following steps are involved: The concentration and flow of the pulp in the pulp pool are detected in real time through the parameter detection module, and the detected data is transmitted to the controller; the controller calculates the required amount of bio-enzyme preparation to be added according to the received pulp concentration and flow parameters, and generates a corresponding control signal; the metering pump accurately adjusts the delivery flow according to the control signal, and delivers the bio-enzyme preparation from the storage container to the pulp pool; then the effect detection module detects the effect parameters of the pulp after being treated with the bio-enzyme preparation, transmits the detected treatment effect parameter data to the controller, and determines whether the treatment effect meets the preset standard.

2. The pulp sediment passivation and anti-sticking method according to claim 1, characterized in that: The controller can also determine whether the received pulp concentration and flow parameters are within the preset parameter setting range based on the received pulp concentration and flow parameters. If they are not within the range, an alarm signal will be issued and the abnormal situation will be recorded.

3. The pulp sediment passivation and anti-sticking method according to claim 1, characterized in that: If the treatment effect does not reach the preset standard, the calculation of the amount of bio-enzyme preparation added is readjusted according to the deviation between the two, and the adjusted control signal is sent to the metering pump again.

4. The pulp sediment passivation and anti-sticking method according to claim 1, characterized in that: The relationship between the amount of bio-enzyme added and the pulp concentration and flow rate is expressed by the following formula: Qm=k×C×Qp Among them, Qm represents the addition amount of the bio-enzyme preparation, k is a comprehensive coefficient, which is related to the activity of the bio-enzyme preparation, pulp characteristics, and production process requirements, C is the pulp concentration, and Qp is the pulp flow rate.

5. A pulp sediment passivation and anti-sticking system, characterized in that: It comprises a parameter detection module, a controller, a metering pump and an effect detection module, and the parameter detection module, the metering pump and the effect detection module are all connected to the controller to execute the pulp sediment passivation and anti-sticking method according to any one of claims 1-5.

6. The pulp sediment passivation and anti-sticking system according to claim 5, characterized in that: The parameter detection module includes a concentration sensor and a flow sensor. The concentration sensor is installed in the pulp conveying pipeline, and the flow sensor is installed on the pulp conveying pipeline.

7. The pulp sediment passivation and anti-sticking system according to claim 6, characterized in that: The effect detection module is arranged in the pulp tank or in the subsequent process link.

8. The pulp sediment passivation and anti-sticking system according to claim 7, characterized in that: The effect parameters detected by the effect detection module include paper strength and whiteness.

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