Defibrator grinding chamber body fiber discharge system based on compressed air replacing steam

Abstract

The invention relates to the technical field of wood board fiber processing, and provides a defibrator grinding chamber body fiber discharge system based on compressed air replacing steam, which comprises an air compressor station, an air storage tank, a regulating valve, a one-way valve and a grinding chamber body, the gas storage tank is connected with the adjusting valve through a first pipeline, the one-way valve is connected with the adjusting valve through a third pipeline, and the one-way valve is connected with the flange on the grinding chamber body through a fourth pipeline. According to the invention, steam is replaced by compressed air, so that the generation of the steam is reduced from the source, the fuel consumption for generating the steam is greatly reduced, and the preparation quality and the production efficiency of the wood fiber are improved.

Description

Technical Field

[0001] The present application relates to the technical field of wood fiber preparation, and in particular to a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam and a method for using the same. Background Art

[0002] In the traditional wood fiber production process, wood chips undergo high-temperature steaming. The steamed wood chips are then ground into qualified fibers using the static and high-speed rotating discs of a hot refiner. These qualified fibers are first discharged into the refiner's grinding chamber. Steam applied to the chamber and residual steam pressure from the cooking process then blow the fibers out of the chamber and into subsequent pulping and drying pipes. This traditional method has significant technical drawbacks. First, the continuous consumption of large amounts of steam leads to high energy demands, increasing fuel costs and causing serious carbon emissions, which is inconsistent with current environmental protection requirements. Second, the steam system has high operating and maintenance costs and is prone to equipment corrosion. Third, fluctuations in steam pressure can easily lead to uneven fiber discharge, affecting product quality and stability. Furthermore, the steam system requires complex boiler equipment, which increases plant space and poses safety risks. These technical drawbacks severely restrict the economic efficiency and environmental friendliness of wood fiber production. To address these issues, existing technologies urgently need to be improved. Summary of the Invention

[0003] The purpose of this application is to provide a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam and a method of using the system, which has the advantages of reducing energy consumption, reducing carbon emissions, improving the stability of fiber discharge pressure and reducing equipment maintenance costs.

[0004] The present application provides a fiber discharge system for a hot mill mill chamber using compressed air instead of steam. The technical solution is as follows: The fiber discharge system for a hot mill mill chamber using compressed air instead of steam includes: a PLC controller for controlling a regulating valve, a pressure sensor for transmitting data, an air compressor station for providing power, an air storage tank, a regulating valve, a one-way valve, and a mill chamber body. The air compressor station and the air storage tank are connected via pipe 1, the air storage tank and the regulating valve are connected via pipe 2, the one-way valve and the regulating valve are connected via pipe 3, and the one-way valve and the flange on the mill chamber body are connected via pipe 4. The air compressor station and the mill chamber body are in communication connection with the pressure sensor, and the PLC controller is in communication connection with the regulating valve.

[0005] Furthermore, the present application also proposes a method of use: when the steam pressure value of 0.8Mpa is detected by the steam pressure sensor, the pressure value is compared and calculated by the PLC controller and the pressure value of the air compressor station. When the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder, the PLC controller automatically (or manually) opens the regulating valve, and the compressed air is transported to the grinding chamber body through the pipeline in turn through the air storage tank (the compressed air generated by the air compressor station is stored in a certain amount in the air storage tank until the pressure stabilizes), the regulating valve (the valve can adjust the compressed air pressure according to actual production conditions to meet the pressure requirement of the hot mill grinding chamber. After reaching the required pressure, it is passed into the one-way valve), and the one-way valve (which can prevent the steam in the cooking cylinder from flowing into the pipeline and plays a one-way passing role), so that the wood board fibers in the grinding chamber body are subjected to the action of compressed air, so that the wood board fibers are discharged from the pipeline.

[0006] From the above, it can be seen that the present application provides a hot mill grinding chamber fiber discharge system based on compressed air instead of steam and its use method. By using compressed air instead of traditional steam to drive fiber discharge, the PLC controller, pressure sensor and air compressor station are used to collaboratively control the pressure. While ensuring the fiber discharge efficiency, it effectively reduces steam consumption and equipment corrosion problems, and has the advantages of reducing energy consumption, reducing carbon emissions, improving fiber discharge pressure stability and reducing equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0008] Figure 1 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0009] The technical solutions of this application will be described clearly and completely below in conjunction with the accompanying drawings. It should be understood that the described embodiments represent only a portion of the embodiments of this application, and not all of them. The components of this application, generally described and illustrated in the drawings herein, may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application, but rather merely represents selected embodiments of this application. All other embodiments derived by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0010] In existing technologies, the wood fiber production process requires the use of steam pressure to expel the fibers from the grinding chamber of a thermal refiner. This high steam consumption increases fuel costs and generates high carbon emissions, which is environmentally unfriendly. Traditional methods rely on steam as a power source, requiring constant steam pressure, resulting in energy waste and the risk of condensate accumulation in steam lines, impacting system stability.

[0011] To address these issues, the team considered using compressed air as a power source instead of steam. However, this required addressing technical challenges such as regulating the compressed air pressure, matching it with the steaming cylinder pressure, and preventing steam backflow. By introducing a pressure sensor to monitor steam pressure in real time and integrating it with a programmable controller, the team dynamically adjusted the compressed air pressure to ensure a balance between the two pressures. Furthermore, a one-way valve was used to prevent steam backflow and maintain unidirectional flow in the pipeline, thereby ensuring efficient fiber discharge while reducing energy consumption.

[0012] Therefore, this application proposes a fiber discharge system for a hot mill mill chamber using compressed air instead of steam. The system includes a PLC controller, a pressure sensor, an air compressor station, an air storage tank, a regulating valve, a check valve, and a mill chamber. The air compressor station is connected to the air storage tank via pipeline 1, which is connected to the regulating valve via pipeline 2. The regulating valve is connected to the check valve via pipeline 3, which is then connected to the mill chamber flange via pipeline 4. The pressure sensor is connected to the air compressor station and the mill chamber, and the PLC controller is connected to the regulating valve.

[0013] Among them, the PLC controller refers to a programmable logic controller, which can be implemented by an industrial-grade PLC module, and is used to receive pressure signals and control the opening of the regulating valve. The pressure sensor refers to a device for detecting steam pressure, which can be implemented by a piezoresistive sensor, and is used to transmit the pressure signal to the PLC controller. The air compressor station refers to a compressed air generating device, which can be implemented by a screw air compressor, and is used to provide a stable gas source. The gas tank refers to a gas storage container, which can be implemented by a carbon steel pressure vessel, and is used to buffer air pressure fluctuations. The regulating valve refers to a pressure regulating device, which can be implemented by an electric proportional valve, and is used to adjust the compressed air output pressure. The one-way valve refers to a valve that prevents the backflow of the medium, which can be implemented by a spring-loaded check valve, and is used to prevent steam from entering the compressed air pipeline.

[0014] Specifically, when the pressure sensor detects that the steam pressure in the cooking cylinder reaches the set value, the PLC controller compares the output pressure of the air compressor station with the pressure of the cooking cylinder and adjusts the compressed air pressure to a matching state through the regulating valve. Assume that the steam pressure in the cooking cylinder detected by the steam pressure sensor is P steam The compressed air pressure detection value output by the air compressor station is P air , the maximum pressure deviation allowed by the system is ΔP max , the PLC controller determines whether to open the regulating valve by calculating the pressure difference: ΔP=|P steam -P air |

[0015] When ΔP≤ΔP max When the compressed air pressure matches the steam pressure, the regulating valve is triggered to open.

[0016] The compressed air flows through the air storage tank to stabilize the pressure, and then enters the grinding chamber through the one-way valve after precise pressure adjustment by the regulating valve, pushing the fiber out. The air storage tank can absorb the output pressure fluctuation of the air compressor station, and its output pressure P tank , approximated by the ideal gas law (ignoring temperature changes):

[0017]

[0018] Among them, V air Input the air volume of the air tank to the air compressor in real time, P reserve is the residual gas pressure in the gas tank, V reserve is the residual gas volume, V tank is the total volume of the gas tank;

[0019] This buffer mechanism ensures stable system pressure; the one-way valve automatically opens when compressed air is input and automatically closes when steam pressure rises to avoid two-way flow.

[0020] Compared to existing technologies, traditional methods rely on steam as a sole power source, requiring continuous fuel consumption to maintain steam pressure. This solution, however, partially replaces steam with compressed air, achieving on-demand energy supply through closed-loop pressure control. Existing steam lines are prone to condensation, which can affect fiber discharge stability. This solution uses a one-way valve to isolate the steam and compressed air lines, eliminating the risk of condensation interference.

[0021] Through the above technical solution, this application reduces steam consumption and fuel costs, and reduces carbon emissions; the compressed air pressure can be dynamically adjusted according to production needs to avoid energy waste; the one-way valve structure effectively prevents steam backflow and improves system reliability; the buffering effect of the air storage tank ensures stable pressure output and improves fiber discharge efficiency.

[0022] The present application further proposes a method for using a fiber discharge system for a hot mill grinding chamber based on compressed air replacing steam, which is characterized in that: when the steam pressure value of 0.8 MPa is detected by a steam pressure sensor, the pressure value is compared and calculated by a PLC controller and the pressure value of the air compressor station. When the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder, the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber body through a pipeline through an air storage tank, a regulating valve, and a one-way valve in sequence, so that the wood fiber in the grinding chamber body can be discharged from the pipeline under the action of compressed air.

[0023] Among them, the steam pressure sensor refers to a device used to monitor the steam pressure in the cooking cylinder in real time. Specifically, it can be implemented by a piezoelectric sensor or a capacitive sensor. Its function is to convert the pressure signal into an electrical signal and transmit it to the PLC controller.

[0024] Among them, the PLC controller refers to a programmable logic controller, which can be implemented using an industrial-grade embedded system. Its function is to generate control instructions to operate the regulating valve to open or close by receiving the signal from the pressure sensor and comparing it with the output pressure of the air compressor station (that is, calculating the pressure difference through ΔP).

[0025] The regulating valve is a device used to adjust the flow of compressed air. It can be implemented using an electric proportional valve or a pneumatic diaphragm regulating valve. Its function is to dynamically adjust the pressure of the compressed air in the pipeline according to the instructions of the PLC controller to keep it synchronized with the pressure of the cooking cylinder. Its opening control signal is generated by the built-in PID algorithm of the PLC controller:

[0026]

[0027] Among them, K p is the proportional coefficient, T i is the integration time, T d is the differential time, ΔP(t)=P steam(t)-P air (t) is the real-time pressure deviation, and MV0 is the initial opening reference value.

[0028] Among them, the one-way valve refers to a valve that only allows the medium to flow in one direction. Specifically, it can be implemented by a spring-loaded check valve or a lift check valve. Its function is to prevent the steam in the cooking cylinder from flowing back into the compressed air pipeline, avoiding pressure fluctuations caused by medium mixing.

[0029] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder reaches 0.8 MPa, the pressure data is transmitted to the PLC controller in real time. The PLC controller compares the compressed air pressure output by the air compressor station with the cooking cylinder pressure through ΔP calculation;

[0030] When the two reach a state of equilibrium ΔP≤ΔP max When the controller triggers the opening command of the regulating valve, the compressed air is buffered by the air tank (through P tank After achieving pressure stabilization using a formula, the compressed air enters the milling chamber through a regulating valve, fine-tuning the pressure based on a PID formula. The air then enters the milling chamber through a check valve. During this process, the air tank stabilizes the compressed air pressure, the regulating valve dynamically adjusts the output pressure based on actual demand, and the check valve ensures a unidirectional flow of compressed air. Once the compressed air enters the milling chamber, its pressure pushes the wood fiber through the discharge pipe for delivery.

[0031] Compared to existing technologies, existing fiber delivery systems rely entirely on steam pressure to drive fiber transport, requiring the continuous consumption of large amounts of steam and fuel to maintain pressure. This solution, however, replaces steam with compressed air as the power source, precisely controlling airflow output while maintaining pressure balance. This avoids continuous steam consumption while also preventing the risk of steam backflow through a one-way valve. The potential for steam and compressed air mixing and interference in existing technologies is effectively addressed in this solution through synchronized pressure control (based on the ΔP formula) and a one-way valve structure.

[0032] Through the above technical solution, this application achieves a significant reduction in steam usage during the fiber discharge process, reducing fuel consumption and carbon emissions, while ensuring the stability of fiber discharge through pressure balance control. The use of a one-way valve eliminates the hidden dangers of steam backflow leading to pipeline corrosion or pressure imbalance, and the precise control of the regulating valve (based on the PID formula) enables the system to quickly respond to pressure requirements under different operating conditions.

[0033] The present application further proposes a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising a PLC controller for controlling a regulating valve, a pressure sensor for transmitting data, an air compressor station for providing power, an air storage tank, a regulating valve, a one-way valve, and a mill chamber body. The air compressor station and the air storage tank are connected via a pipe one, the air storage tank and the regulating valve are connected via a pipe two, the one-way valve and the regulating valve are connected via a pipe three, the one-way valve and the flange on the mill chamber body are connected via a pipe four, the air compressor station, the mill chamber body, and the pressure sensor are in communication connection, and the PLC controller and the regulating valve are in communication connection.

[0034] Among them, the regulating valve refers to a device that adjusts the compressed air pressure by receiving instructions from the PLC controller. Specifically, it can be implemented by an electromagnetic proportional valve. By changing the valve core opening, the flow and pressure of the compressed air in the pipeline are controlled. Its opening adjustment is based on the PID formula to meet the dynamic pressure requirements of the grinding chamber body. The air storage tank refers to a container used to store the compressed air generated by the air compressor station and stabilize its pressure. Specifically, it can be implemented by a metal tank with a pressure buffer structure. The internal volume buffers the air flow pulsation, and its output pressure is measured by (P tank ) calculations to maintain a stable output pressure and avoid pressure fluctuations that affect fiber discharge. A pressure sensor is a device used to detect steam pressure within the cooking cylinder. Specifically, a piezoresistive sensor can be used. This converts the pressure signal into an electrical signal and transmits it to the PLC controller, providing real-time data support for regulating valve control (based on the ΔP formula).

[0035] Specifically, when the pressure sensor detects that the steam pressure in the cooking cylinder reaches the set value, for example 0.8Mpa, the PLC controller compares the compressed air pressure generated by the air compressor station with the pressure in the cooking cylinder through ΔP, and calculates and compares the pressure when the two pressures are consistent (ΔP≤ΔP max ) automatically or manually open the regulating valve. Compressed air is stored and pressure stabilized through the air tank in turn (based on (P tank ) formula), and then adjusted to the target pressure by the regulating valve (based on the PID formula), and then delivered to the grinding chamber body through the one-way valve.

[0036] During this process, the air storage tank acts as a buffer to smooth out pressure fluctuations at the compressor station's output. The regulating valve dynamically adjusts its opening based on real-time pressure feedback to ensure that the compressed air pressure matches the pressure inside the cooking cylinder. A check valve prevents steam from flowing back into the pipe. Thus, compressed air replaces steam, pushing the wood fiber inside the mill chamber into the pulp discharge pipe for fiber discharge.

[0037] Compared with the existing technology, which relies on steam pressure to discharge fibers and consumes a large amount of steam and fuel, this solution stabilizes the compressed air pressure through the air storage tank (based on P tankFormula), combined with closed-loop control of the regulating valve (based on ΔP and PID formulas), precisely matches the compressed air pressure within the cooking cylinder, completely replacing steam while ensuring efficient fiber discharge. Furthermore, the introduction of a one-way valve prevents mixing of steam and compressed air, further reducing energy waste.

[0038] Through the above technical solution, the present application solves the problems of large steam consumption, high fuel costs and increased carbon emissions in the prior art. By dynamically matching the compressed air and steam pressure (based on the ΔP formula), zero steam consumption is achieved during the fiber discharge process, while avoiding fiber blockage or insufficient discharge due to pressure mismatch.

[0039] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising: when the steam pressure value detected by the steam pressure sensor is 0.8 MPa, the pressure value is compared and calculated by the PLC controller and the pressure value of the air compressor station (i.e., ΔP, when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence. The air storage tank is used to store the compressed air generated by the air compressor station until the pressure is stable (based on P tank Formula), the regulating valve is used to adjust the compressed air pressure to meet the pressure demand of the grinding chamber of the hot refiner (based on the PID formula), and the one-way valve is used to prevent the steam in the cooking cylinder from flowing into the pipeline.

[0040] Among them, the steam pressure sensor refers to a device used to detect the steam pressure in the cooking cylinder. Specifically, it can be implemented using a piezoresistive sensor. Its function is to convert the pressure signal into an electrical signal and transmit it to the PLC controller, thereby providing a data basis for the pressure comparison operation (based on the ΔP formula).

[0041] Among them, the PLC controller refers to a programmable logic controller, which can be implemented by an industrial controller with an analog input module. Its function is to control the opening or closing action of the regulating valve by receiving the signal from the pressure sensor and comparing it with the air compressor station pressure in real time (based on the ΔP formula).

[0042] Among them, the gas tank refers to a container for storing compressed air, which can be realized by a carbon steel welded structure. Its function is to buffer and store compressed air to maintain the pressure stability in the pipeline (based on P tank formula) to avoid the system pressure balance being affected by the instantaneous output fluctuation of the air compressor.

[0043] Among them, the regulating valve refers to a valve used to adjust the flow rate of compressed air. Specifically, it can be achieved by an electric proportional regulating valve. Its function is to dynamically adjust the output pressure of the compressed air according to the instructions of the PLC controller (based on the PID formula) to ensure that it matches the pressure in the cooking cylinder.

[0044] Among them, the one-way valve refers to a valve that only allows the medium to flow in one direction. It can be implemented by a spring-loaded structure. Its function is to block the steam in the cooking cylinder from flowing back into the compressed air pipe, avoiding the mixing of steam and compressed air to cause energy loss.

[0045] Specifically, when the steam pressure sensor detects that the steam pressure in the cooking cylinder reaches 0.8 MPa, the PLC controller compares the collected pressure signal with the compressed air pressure output by the air compressor station in real time through ΔP.

[0046] If the pressures of the two are the same (ΔP≤ΔP max ), the PLC controller will trigger the control valve to open the command, and the compressed air will be buffered from the air compressor station through the air tank (based on P tank Formula) and then enters the regulating valve, is adjusted to the target pressure value by the regulating valve (based on the PID formula), and then is delivered to the grinding chamber body through the one-way valve.

[0047] During this process, the air tank continuously stores compressed air to ensure stable pipeline pressure. The regulating valve dynamically adjusts the output pressure based on actual demand, and the one-way valve prevents steam backflow through its one-way conduction. Thus, compressed air replaces steam in pushing the wood fiber inside the mill chamber into the pulp discharge pipe, achieving fiber discharge.

[0048] Compared with the existing technology, which relies on steam pressure to push fiber discharge and requires continuous consumption of large amounts of steam and fuel, this solution replaces steam with compressed air and uses an air compressor station and an air storage tank to build a closed-loop pressure control system (based on P tank , ΔP, and PID formulas) completely eliminates steam consumption while ensuring fiber discharge efficiency. Furthermore, the introduction of a one-way valve prevents mixing interference between steam and compressed air, further improving system stability.

[0049] Through the above technical solution, the present application can complete the fiber discharge operation without relying on steam supply, directly reducing fuel consumption and carbon emissions. At the same time, through pressure closed-loop control (based on ΔP and PID formulas), the discharge process is ensured to be dynamically matched with the cooking cylinder pressure, avoiding problems such as poor fiber discharge or equipment overload due to pressure fluctuations.

[0050] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising: detecting a steam pressure value of 0.8 MPa by a steam pressure sensor, comparing the pressure value with the pressure value of the air compressor station (ΔP) through a PLC controller, and when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber in the grinding chamber is discharged from the pipeline under the action of compressed air.

[0051] Among them, the steam pressure sensor refers to a device used to detect the steam pressure in the cooking cylinder in real time. Specifically, it can be implemented by a piezoresistive sensor with a signal transmission function. Its function is to convert the pressure signal into an electrical signal and transmit it to the PLC controller, providing a data basis for pressure comparison operations (based on the ΔP formula).

[0052] Among them, the PLC controller refers to a programmable logic control device, which can be implemented by an industrial controller with an integrated operation module. Its function is to control the opening or closing state of the regulating valve by receiving the signal from the pressure sensor and performing logical operations (based on the ΔP formula) with the pressure data of the air compressor station.

[0053] Among them, the regulating valve refers to an actuator used to adjust the compressed air pressure. Specifically, it can be implemented by a proportional valve with an electric drive mechanism. Its function is to dynamically adjust the pressure value of the compressed air in the pipeline according to the instructions of the PLC controller (based on the PID formula) to meet the pressure requirements of the grinding chamber body.

[0054] Among them, the one-way valve refers to a valve that only allows the medium to flow in one direction. Specifically, it can be implemented by a spring-loaded check valve. Its function is to prevent the steam in the cooking cylinder from flowing back into the compressed air pipeline, avoiding pressure fluctuations caused by medium mixing.

[0055] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder reaches 0.8Mpa, the PLC controller compares the compressed air pressure generated by the air compressor station with the cooking cylinder pressure through ΔP in real time. If the two pressures are consistent (ΔP≤ΔP max ), the regulating valve is opened automatically or manually to allow the compressed air to flow through the air storage tank in sequence to buffer and stabilize the pressure (based on P tank The compressed air is then adjusted to the target pressure by a regulating valve (based on a PID formula) and finally delivered to the grinding chamber through a one-way valve. During this process, the compressed air pushes the wood fibers out of the grinding chamber, while the one-way valve prevents reverse steam flow, ensuring stable system pressure.

[0056] Compared with the existing technology, which relies on steam pressure to push fiber discharge and requires continuous consumption of large amounts of steam and fuel, this solution replaces steam with compressed air and uses a combination of an air compressor station and an air storage tank to achieve stable pressure supply (based on P tank Formula), while simultaneously avoiding energy loss due to steam backflow through closed-loop pressure control (based on ΔP and PID formula) in conjunction with a one-way valve. Through the above technical solution, this application can significantly reduce steam usage, fuel consumption, and carbon emissions. At the same time, precise pressure control (based on (ΔP) and PID formula) ensures fiber discharge efficiency, solving the high energy consumption and environmental issues caused by the existing technology's reliance on steam.

[0057] The present application further proposes that when the steam pressure value detected by the steam pressure sensor is 0.8Mpa, the pressure value is compared and calculated (ΔP) by the PLC controller and the pressure value of the air compressor station. When the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber in the grinding chamber body is discharged from the pipeline under the action of compressed air.

[0058] Among them, the steam pressure sensor refers to a device used to detect the steam pressure in the cooking cylinder. Specifically, it can be implemented by a resistive pressure sensor or a piezoelectric sensor, which monitors the pressure changes in real time and transmits the data to the PLC controller.

[0059] Among them, the PLC controller refers to a programmable logic controller, which can be implemented using an industrial-grade modular controller. It controls the opening and closing of the regulating valve by receiving the signal from the pressure sensor and performing logical operations with the pressure data of the air compressor station (based on the ΔP formula).

[0060] Among them, the gas storage tank refers to a container for storing compressed air, which can be made of carbon steel welded structure. It can buffer the pressure fluctuation of the air compressor station output and maintain the stable air pressure in the pipeline (based on P tank formula).

[0061] Among them, the regulating valve refers to a device that controls the flow of compressed air. Specifically, it can be achieved by using an electric proportional regulating valve. By adjusting the valve opening (based on the PID formula), the pressure parameters of the compressed air in the pipeline are changed to meet the pressure requirements of the grinding chamber.

[0062] Among them, the one-way valve refers to a valve that prevents the reverse flow of fluid. Specifically, it can be achieved by using a spring-loaded check valve, which prevents the steam in the cooking cylinder from flowing back toward the pipeline to avoid energy loss.

[0063] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder reaches 0.8Mpa, the PLC controller compares the pressure data output by the air compressor station with the pressure of the cooking cylinder through ΔP in real time. max ) after which the regulating valve is opened and the compressed air passes through the air storage tank for buffering and pressure stabilization (based on P tank The compressed air is then transported to the mill body through a process called a PID control valve (based on a PID formula), precise pressure regulation by a regulating valve (based on a PID formula), and one-way flow by a check valve. Compressed air propels the wood fiber out of the mill body and into a pipeline, replacing the traditional steam pressure-driven method. During this process, the air receiver maintains stable system pressure by storing and releasing compressed air. The regulating valve dynamically adjusts pressure parameters based on actual production needs, and the check valve prevents reverse steam leakage.

[0064] Compared to existing technologies, which rely on steam pressure to drive fiber discharge and require continuous consumption of large amounts of steam and fuel, this solution replaces steam with compressed air. After pressure equilibrium (based on the ΔP formula), fiber discharge can be completed using only compressed air generated by the air compressor station. In existing technologies, direct contact between steam and fibers can lead to heat energy loss. In this solution, there is no heat exchange between the compressed air and fibers, avoiding energy waste caused by steam condensation.

[0065] Through the above technical solution, this application solves the problems of high fuel costs and carbon emissions caused by large steam consumption, and realizes efficient fiber discharge through dynamic balance control of compressed air and steam pressure (based on the ΔP formula). At the same time, a one-way valve is used to block steam backflow, thereby reducing energy loss and reducing the risk of equipment corrosion.

[0066] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising: when the steam pressure value detected by the steam pressure sensor is 0.8 MPa, the pressure value is compared and calculated ΔP by a PLC controller and the pressure value of the air compressor station; when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber in the grinding chamber is discharged from the pipeline under the action of compressed air.

[0067] Among them, the steam pressure sensor refers to a device used to detect the steam pressure in the cooking cylinder. Specifically, it can be implemented by a piezoelectric sensor or a resistive strain sensor. Its function is to convert the pressure signal into an electrical signal and transmit it to the PLC controller.

[0068] Among them, the PLC controller refers to a programmable logic controller, which can be implemented using an industrial-grade embedded control system. Its function is to control the opening or closing of the regulating valve by receiving the signal from the pressure sensor and performing logical operations with the pressure value of the air compressor station (based on the ΔP formula).

[0069] Among them, the gas storage tank refers to a container for storing compressed air, which can be realized by a carbon steel welded structure. Its function is to buffer and store the compressed air output by the air compressor station to keep the pressure in the pipeline stable (based on P tank formula).

[0070] Among them, the regulating valve refers to a valve used to adjust the compressed air pressure, which can be specifically achieved by an electric proportional regulating valve. Its function is to dynamically adjust the output pressure of the compressed air according to the real-time pressure demand of the grinding chamber body (based on the PID formula).

[0071] Among them, the one-way valve refers to a valve that only allows the medium to flow in one direction. Specifically, it can be implemented by a spring-loaded check valve structure. Its function is to prevent the steam in the cooking cylinder from flowing back into the compressed air pipeline.

[0072] Specifically, when the steam pressure sensor detects that the steam pressure in the cooking cylinder reaches 0.8Mpa, the PLC controller compares the pressure value output by the air compressor station with the pressure of the cooking cylinder in real time through ΔP. When the pressures of the two are equal (ΔP≤ΔP max ) when the regulating valve is opened automatically or manually, and the compressed air is buffered from the air compressor station through the air storage tank (based on P tank Formula) enters the regulating valve, undergoes pressure adjustment (based on the PID formula), and is then delivered to the check valve before being injected into the grinding chamber. During this process, the check valve prevents steam from the cooking cylinder from flowing back into the compressed air pipeline. The air storage tank eliminates compressed air pressure fluctuations. The regulating valve dynamically adjusts the compressed air output pressure based on the real-time pressure demand of the grinding chamber, thereby pushing the wood fiber out of the grinding chamber.

[0073] Compared with the existing technology, the existing technology relies on steam pressure to drive fiber discharge, which requires continuous consumption of large amounts of steam and fuel. However, this solution replaces steam with compressed air, uses pressure closed-loop control (based on ΔP and PID formula) to achieve pressure matching, and stabilizes the air pressure through the air tank (based on P tank formula), dynamic pressure regulation of the regulating valve and the one-way valve prevent the medium from flowing back, avoiding the continuous consumption of steam while ensuring the fiber discharge efficiency.

[0074] Through the above technical solution, this application solves the problems of high fuel costs and carbon emissions caused by large steam consumption. The pressure of compressed air can be supplied on demand through the air compressor station, avoiding energy waste in the steam preparation process. At the same time, the cooperation between the one-way valve and the air storage tank further improves the stability of the system operation.

[0075] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising: when the steam pressure value is 0.8 MPa detected by a steam pressure sensor, the pressure value is compared and calculated (ΔP) by a PLC controller and the pressure value of an air compressor station; when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP ≤ ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber is discharged from the pipeline under the action of compressed air; the air storage tank is used to store the compressed air generated by the air compressor station until the pressure is stable (based on P tank formula); the regulating valve is used to adjust the compressed air pressure to meet the pressure demand of the grinding chamber of the thermal refiner (based on the PID formula); the one-way valve is used to prevent the steam in the cooking cylinder from flowing into the pipeline.

[0076] Among them, the PLC controller refers to a programmable logic controller, which can be implemented using an industrial-grade control module. It is used to receive the signal from the pressure sensor and perform calculations and comparisons with the air compressor station pressure (based on the ΔP formula) to control the opening or closing of the regulating valve.

[0077] The pressure sensor refers to a device for detecting steam pressure, which can be implemented using a piezoresistive sensor, and is used to monitor the pressure value in the cooking cylinder in real time and transmit it to the PLC controller.

[0078] Among them, the gas storage tank refers to a container for storing compressed air, which can be realized by a carbon steel pressure vessel, and is used to buffer the air flow fluctuation output by the air compressor station and maintain pressure stability (based on P tank formula).

[0079] Among them, the regulating valve refers to a device that controls the flow of compressed air, which can be specifically implemented by an electric proportional valve, and is used to adjust the output pressure according to the instructions of the PLC controller (based on the PID formula) to meet the needs of the grinding chamber.

[0080] Among them, the one-way valve refers to a valve that only allows the medium to flow in one direction. It can be specifically implemented by a spring-loaded check valve, which is used to block the reverse flow of steam in the cooking cylinder into the compressed air pipeline.

[0081] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder reaches 0.8Mpa, the PLC controller compares the pressure value output by the air compressor station with the pressure of the cooking cylinder through ΔP in real time. max ) after which the PLC controller triggers the regulating valve to open, and the compressed air flows through the air storage tank in turn to complete the pressure buffering (based on P tank Formula), then adjusted to the target pressure by a regulating valve (based on a PID formula), and finally injected into the grinding chamber through a check valve. During this process, the air receiver eliminates fluctuations in the output pressure of the air compressor station, the regulating valve ensures that the compressed air pressure matches the demand of the grinding chamber, and the check valve prevents energy loss caused by steam backflow.

[0082] Compared with the existing technology, which relies on steam pressure to push fiber discharge and requires continuous consumption of fuel to maintain steam generation, this solution replaces steam with compressed air and utilizes the air compressor station and pressure closed-loop control system (based on ΔP, P tank and PID formula) to achieve energy supply on demand and avoid fuel waste in the steam preparation process.

[0083] Through the above technical solution, this application solves the problems of high fuel costs and carbon emissions caused by excessive steam consumption. By replacing the continuous steam supply with dynamic pressure matching of compressed air (based on the (ΔP) formula), energy waste is reduced while ensuring fiber discharge efficiency, and the blocking effect of the one-way valve further prevents energy loss caused by steam leakage.

[0084] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising the following steps: when the steam pressure value detected by the steam pressure sensor is 0.8 MPa, the pressure value is compared and calculated (ΔP) by a PLC controller and the pressure value of the air compressor station; when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber in the grinding chamber is discharged from the pipeline under the action of compressed air.

[0085] Among them, the PLC controller refers to a logical operation device used to receive sensor signals and control valve actions. It can be implemented using an industrial-grade programmable controller. Its function is to dynamically adjust the valve opening and closing state according to the pressure difference (based on the ΔP formula) to ensure that the compressed air and steam pressures match.

[0086] Among them, the pressure sensor refers to a detection device used to monitor the steam pressure in the cooking cylinder in real time. Specifically, it can be implemented using a piezoelectric or capacitive sensor. Its function is to convert the pressure signal into an electrical signal and transmit it to the controller to provide data support for pressure balance.

[0087] Among them, the air compressor station refers to the power unit that provides compressed air for the system. Specifically, it can be achieved by using a multi-stage screw air compressor. Its function is to generate stable and adjustable air pressure to replace traditional steam power.

[0088] Among them, the air storage tank refers to a container used to store and stabilize the compressed air pressure. It can be realized by using a carbon steel welded structure. Its function is to buffer the pressure fluctuation of the air compressor output (based on P tank formula) to ensure that the subsequent pipeline pressure is stable.

[0089] Among them, the regulating valve refers to a valve used to control the flow and pressure of compressed air. Specifically, it can be achieved by an electric proportional regulating valve. Its function is to accurately adjust the air pressure parameters input to the grinding chamber body according to actual production needs (based on the PID formula).

[0090] Among them, the one-way valve refers to a valve that only allows compressed air to flow in one direction. Specifically, it can be implemented by a spring-loaded check valve. Its function is to prevent the steam in the cooking cylinder from flowing back into the compressed air pipeline to avoid medium mixing.

[0091] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder has reached the set threshold, the PLC controller compares the output pressure of the air compressor station with the pressure of the cooking cylinder through ΔP in real time, and when the two reach a balance (ΔP≤ΔP max ) triggers the regulating valve to open. The compressed air is stabilized by the gas tank (based on P tank The compressed air is then adjusted to the target pressure by a regulating valve (based on a PID formula) and then delivered to the grinding chamber through a one-way valve. During this process, the compressed air pushes the wood fiber out of the grinding chamber and into the pipeline, replacing the original steam pressure drive method.

[0092] In some specific embodiments, the volume of the gas tank can be adapted according to the output power of the air compressor station. For example, a gas tank with a volume of 2 cubic meters is used to match medium-scale production needs; the opening control signal of the regulating valve can be generated by the built-in PID algorithm of the PLC controller to achieve dynamic pressure regulation; the installation direction of the one-way valve must be consistent with the flow direction of the compressed air to avoid reverse leakage.

[0093] Compared with the existing technology, which relies on steam pressure to drive fiber discharge and consumes a large amount of steam and fuel, this solution directly reduces steam consumption by replacing steam with compressed air. At the same time, the combination of air compressor station and air storage tank (based on Ptank The system recycles compressed air, avoiding heat waste from steam emissions. Furthermore, the closed-loop control mechanism (based on ΔP and PID) between the PLC controller and pressure sensor improves pressure regulation accuracy and reduces the need for manual intervention.

[0094] Through the above technical solution, this application solves the problems of high steam consumption, high fuel costs, and large carbon emissions in traditional fiber exhaust systems. Compressed air replaces steam, reducing boiler fuel demand and lowering production energy consumption. The closed-loop pressure control mechanism (based on ΔP and PID formulas) avoids energy waste caused by excessive steam use. The anti-backflow design of the one-way valve ensures system operation safety and avoids the risk of equipment corrosion caused by medium mixing.

[0095] The present application further proposes a method for using a fiber discharge system for a hot mill mill chamber based on compressed air replacing steam, comprising: detecting a steam pressure value of 0.8 MPa by a steam pressure sensor, comparing the pressure value with the pressure value of the air compressor station (ΔP) through a PLC controller, and when the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder (ΔP≤ΔP max ), the PLC controller automatically or manually opens the regulating valve, and the compressed air is transported to the grinding chamber through the pipeline through the air storage tank, regulating valve, and one-way valve in sequence, so that the wood fiber in the grinding chamber body is discharged from the pipeline under the action of compressed air.

[0096] Among them, the PLC controller refers to a programmable logic controller, which is used to receive the signal from the pressure sensor and perform logical operations with the preset value (based on the ΔP formula), and output control instructions to drive the regulating valve. The pressure sensor refers to a device that detects the steam pressure in the cooking cylinder. Specifically, it can be implemented by a piezoresistive sensor, which is used to monitor the pressure data in real time and transmit it to the PLC controller. The air storage tank refers to a container for storing compressed air. Specifically, it can be implemented by a carbon steel welded structure. It is used to buffer the air flow fluctuations output by the air compressor and maintain pressure stability (based on P tank Formula). A regulating valve is an actuator that controls the flow of compressed air. Specifically, it can be implemented as an electric proportional valve. It is used to adjust the air pressure in the pipeline according to PLC instructions (based on the PID formula). A check valve is a valve that restricts the flow of fluid in one direction. Specifically, it can be implemented as a spring-loaded structure. It is used to prevent steam from the cooking cylinder from flowing back into the compressed air pipeline.

[0097] Specifically, when the steam pressure sensor detects that the pressure in the cooking cylinder reaches 0.8Mpa, the PLC controller compares the collected pressure data with the output pressure of the air compressor station through ΔP. When the pressure values ​​of the two reach equilibrium (ΔP≤ΔP max) After that, the regulating valve is triggered to open through the preset program. After the compressed air is output from the air compressor station, it first enters the air storage tank for pressure stabilization (based on P tank The compressed air then flows through a regulating valve for precise pressure regulation (based on a PID formula) before passing through a check valve into the grinding chamber. During this process, the directional airflow created by the compressed air pushes the wood fibers out through the pipe, while the check valve effectively blocks steam backflow.

[0098] Compared with the existing technology, the traditional method completely relies on steam pressure to drive fiber discharge, which requires continuous consumption of large amounts of high-temperature steam and supporting fuel. This solution uses a pressure closed-loop control system (based on ΔP, P tank and PID formula), while maintaining equivalent emission power, the main working medium is replaced by recyclable compressed air, eliminating the energy consumption in the steam preparation link.

[0099] Through the above technical solution, the present application achieves a direct reduction in steam usage during the fiber discharge process, reduces boiler fuel consumption and carbon dioxide emissions, and at the same time reduces the need for high-temperature steam pipeline maintenance, so that equipment operating costs are effectively controlled.

[0100] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A fiber discharge system for a grinding mill chamber based on compressed air instead of steam, including: The PLC controller for controlling the regulating valve, the pressure sensor for data transmission, the air compressor station for power supply, the air storage tank, the regulating valve, the one-way valve, and the grinding chamber body are connected via pipe 1 between the air compressor station and the air storage tank, pipe 2 between the air storage tank and the regulating valve, pipe 3 between the one-way valve and the regulating valve, and pipe 4 between the one-way valve and the flange on the grinding chamber body. The air compressor station and the grinding chamber body are in communication with the pressure sensor, and the PLC controller is in communication with the regulating valve.

2. The fiber discharge system for the grinding chamber of a hot refiner based on compressed air replacing steam according to claim 1, wherein the method of use is: When the steam pressure value detected by the steam pressure sensor is 0.8Mpa, the pressure value is compared and calculated by the PLC controller and the pressure value of the air compressor station. When the pressure generated by the air compressor station is the same as the pressure in the cooking cylinder, the PLC controller automatically (or manually) opens the regulating valve, and the compressed air passes through the pipeline in sequence through the air storage tank (the compressed air generated by the air compressor station is stored in a certain amount in the air storage tank until the pressure stabilizes), the regulating valve (the valve can adjust the compressed air pressure according to actual production conditions to meet the pressure requirement of the hot mill grinding chamber. After reaching the required pressure, it passes into the one-way valve), and the one-way valve (which can prevent the steam in the cooking cylinder from flowing into the pipeline and plays a one-way passing role) and is transported to the grinding chamber body, so that the wood fiber in the grinding chamber body is acted upon by the compressed air and the wood fiber is discharged from the pipeline.

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