PaperRetrofitting PaperMachine Energy Saving and Efficiency Improvement Renovation Project

1.Optimization of the Dryer Cylinder Structure

Conduct a comprehensive and meticulous inspection and assessment of the existing dryer cylinders, including aspects such as the material of the cylinder body, wall thickness, and internal diversion structure. Invite professional engineers and technicians to use advanced detection equipment, such as ultrasonic flaw detectors and endoscopes, to accurately detect the internal conditions of the dryer cylinders to determine whether there are issues such as wear, corrosion, and deformation.

Based on the detection results and the latest technological developments, adopt advanced processing techniques, such as precision casting or CNC machining, to manufacture the cylinder body and internal diversion devices of the new dryer cylinders. During the casting process, strictly control parameters such as casting temperature and cooling rate to ensure uniform material of the cylinder body, without porosity and inclusions. For CNC machining, precisely set the tool path and cutting parameters to ensure machining accuracy and surface quality.

Carefully design and add turbulence plates or spiral diversion fins inside the dryer cylinders. Through complex fluid dynamics simulations and experimental verifications, determine the optimal shape, quantity, and installation position of the turbulence plates or diversion fins. These devices can change the flow path of steam inside the dryer cylinders, increase the contact time and contact area between the steam and the cylinder wall surface, thereby significantly improving the heat transfer efficiency.

2.Waste Heat Recovery

Install highly efficient waste heat recovery heat exchangers, typically plate heat exchangers or tube heat exchangers. During the selection process, fully consider factors such as the temperature, flow rate, and composition of the exhaust gas, as well as the heat transfer coefficient, resistance loss, and corrosion resistance of the heat exchanger to ensure that the heat exchanger can operate stably for a long time under harsh working conditions.

Carefully design the flow channel and heat exchange process of the exhaust gas to ensure that the exhaust gas can fully conduct heat exchange with the medium in the heat exchanger. At the same time, rationally configure the circulating water pump and regulating valve to ensure that the flow rate and flow volume of the heat exchange medium in the heat exchanger reach the optimal state to improve the waste heat recovery efficiency.

Utilize the recovered waste heat to preheat the pulp entering the drying section or transport it through pipelines to other production links that require thermal energy, such as pulp preparation and chemical modulation. During the transportation process, implement insulation measures to reduce heat loss.

3.Improvement of the Ventilation System

Redesign and optimize the layout of the ventilation ducts in the drying section. Use Computational Fluid Dynamics (CFD) software to simulate the airflow distribution under different ventilation duct layouts and select the best scheme that enables uniform distribution of hot air in the drying section.

Install high-performance ventilation fans, selecting models with features such as high efficiency, low noise, and speed adjustment. Based on production requirements and actual working conditions, precisely control the speed of the fans through frequency converters to achieve flexible adjustment of the air volume and improve the recycling utilization rate of hot air.

Install filtering and dehumidification devices in the ventilation system and regularly clean and replace the filtering materials to ensure that the air entering the drying section is clean and dry, reducing the impact on paper quality and energy consumption.

1.Increase in the Number or Diameter of Press Rolls

Evaluate the spatial layout of the press section to determine if there is sufficient space to add press rolls. If space is limited, consider replacing them with press rolls of larger diameters.

Select high-quality materials for the press rolls, such as high-hardness alloy steel or ceramic-coated materials, to improve the wear resistance and compressive capacity of the press rolls. During the manufacturing process, strictly control the machining accuracy and surface roughness to ensure the quality and performance of the press rolls.

When installing new press rolls, precisely adjust the gap and pressure distribution with adjacent components to ensure uniform pressure transmission during the pressing process and improve the dewatering effect.

2.Selection of New Press Felts

Conduct research and testing on various new press felts in the market, comparing their performance indicators such as water absorption, air permeability, and wear resistance. Select press felts that match the production process and paper varieties of the paper machine.

When installing new press felts, strictly follow the manufacturer's installation instructions to ensure the flatness and tension of the felts are appropriate. At the same time, regularly clean and maintain the felts, using appropriate cleaning agents and methods to extend the service life of the felts.

Establish a monitoring system for the operation of the press felts to monitor the running status of the felts in real time, such as pressure, temperature, and humidity parameters. Adjust the pressing process parameters in a timely manner based on the monitoring data to ensure the felts are always in the best working condition.

3.Optimization of the Pressure Control System

Upgrade the existing pressure sensors and transmitters to select models with higher accuracy and faster response speed. At the same time, shield and perform anti-interference processing on the pressure signal transmission lines to ensure the accurate and stable transmission of pressure signals.

Install advanced pressure regulating valves and controllers, such as electric or pneumatic regulating valves, and controllers based on PID control algorithms or intelligent control algorithms. Optimize and tune the parameters of the controllers to achieve precise and rapid adjustment of the pressing pressure.

Establish a remote monitoring and operation platform for the pressure control system, allowing operators to monitor and adjust the pressure of the press section in the control room in real time, improving the convenience and efficiency of operation.

1.Adoption of Variable Frequency Speed Regulation Technology

Evaluate the transmission motors of the paper machine to determine if they are suitable for installing frequency converters. If the motors are old or have poor performance, consider replacing them with high-efficiency and energy-saving motors.

Select an appropriate power and model of the frequency converter, considering performance indicators such as the overload capacity, speed regulation range, and harmonic suppression capacity of the frequency converter. When installing the frequency converter, strictly follow the electrical installation specifications for wiring and commissioning to ensure the safe and reliable operation of the frequency converter.

Based on the production process requirements of the paper machine, write the control program of the frequency converter to achieve automatic adjustment of the motor speed. For example, during the start-up and shutdown processes of the paper machine, adopt a slow speed increase and decrease method to reduce the impact on mechanical components; during the production process, adjust the motor speed in real time according to parameters such as the thickness and basis weight of the paper to achieve energy-saving operation.

2.Optimization of the Lubrication and Cooling of the Transmission System

Regularly inspect and replace the lubricating oil of the transmission system, select high-performance lubricating oil suitable for working conditions to improve the lubrication effect and reduce friction losses.

Install efficient cooling devices, such as air-cooled radiators or water cooling systems, to ensure that the transmission components operate within the normal working temperature range, reducing energy loss and component damage caused by overheating.

Regularly maintain and service the mechanical components of the transmission system, such as checking the meshing of gears and the tension of belts, and make timely adjustments and repairs to reduce energy loss during the transmission process.

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