High-temperature heat pumps can be widely used in drying, Waste heat recovery and heating in paper towel production, greatly improving energy efficiency, reducing costs and promoting green production. The following is an analysis of application cases:
Application points of heat pumps in paper towel production process
- Drying system
- After the paper towel is formed, it needs to be dried to remove moisture, usually requiring hot air or hot water at 60~120°C.
- High-temperature heat pumps can replace traditional steam boilers to provide a stable and efficient heat source.
- Waste heat recovery
- The exhaust of the dryer contains a large amount of waste heat, which can be recovered and heated by heat pumps to preheat fresh air or water.
- Workshop heating and hot water
- The production area needs heating in winter, and high-temperature hot water (70~90°C) is required for the cleaning process.
- Heat pumps provide clean heat sources and reduce the use of fossil energy.
Actual case
High-temperature heat pump transformation project of a paper towel factory
Project background
The factory produces 30,000 tons of paper towels annually. The original drying system relies on natural gas boilers, which has high energy consumption, high costs and serious waste of waste heat.
Renovation content
- Install a high-temperature heat pump system to provide 70~90°C hot air for the dryer.
- Equipped with an exhaust gas waste heat recovery module to recover the heat of the drying exhaust gas for heat pump input.
- Use a heat pump to replace a gas boiler to provide heating and hot water for cleaning in the workshop.
Renovation effect
- Energy saving
- The heat pump COP (coefficient of performance) reaches 4.2;
- After replacing the natural gas boiler, it saves about 350,000 cubic meters of gas annually;
- The drying energy consumption is reduced by about 30%.
- Economic benefits
- Initial investment: about 3 million yuan;
- Annual energy cost savings: about 900,000 yuan;
- Payback period: about 3.3 years.
- Environmental benefits
- Annual reduction of CO₂ emissions by about 800 tons;
- Reduce boiler exhaust emissions and improve the factory environment.
- Improved product quality
- The drying temperature is more uniform, the moisture control accuracy of paper towels is improved, and the scrap rate is reduced.
Advantages summary
- Energy saving and consumption reduction: reduce dependence on natural gas, and significantly reduce comprehensive energy consumption.
- Environmental protection compliance: reduce carbon emissions and pollutant emissions, in line with clean production policies.
- Process optimization: precise temperature control, improve paper towel quality and production efficiency.
- Economic benefits: low operating costs, short payback period, high investment value.
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