Solution
Paper-making industry
I. Production Process and Equipment Used
| Process steps | Core technical movements | Critical temperature parameters | Device Type | Core Use |
| Raw material pretreatment (pulping/steaming) | Wood pulp/waste paper pulping, cooking to remove lignin and impurities, and preparing qualified pulp to ensure pulp toughness. | 100–130°C (steaming/cooking), ambient temperature (pulping) | 1. Shell-and-tube heat exchanger 2. Medium- and High-Temperature Waste Heat Recoverer | 1. Constant-temperature cooking of pulp, followed by heat preservation after pulping. 2. Recovery of waste heat from cooking kettles and pulping equipment |
| Pulp washing/bleaching | Pulp washing and impurity removal, along with bleaching, enhance pulp brightness to meet the quality requirements of various paper products. | 70–90°C (washing), 60–80°C (bleaching) → 30–40°C (cooling and settling) | 1. Plate heat exchanger 2. Screw-type chiller (industrial grade) 3. Plate-and-shell heat exchanger | 1. Precise temperature control and heat retention during the washing/bleaching process 2. Rapid cooling and settling of the pulp after bleaching 3. Recover waste heat from the washing tank and the cooling stage. |
| Paper-making stage | The pulp is diluted, formed, and pressed to remove water, resulting in a paper web; the thickness and compactness of the web are then controlled. | 40–60°C (molding), 50–70°C (pressing) | 1. Plate heat exchanger 2. Plate-and-shell heat exchanger | 1. Constant-temperature insulation during pulp molding and pressing, aiding dewatering. 2. The forming wire is maintained at a constant temperature to prevent paper sheets from sticking together or deforming. |
| Drying stage | Drying and dewatering the paper web, controlling the moisture content of the paper, and enhancing its strength and gloss. | 80–120°C (low-temperature drying), 120–180°C (high-temperature drying) | 1. Finned-tube heat exchanger 2. High-Temperature Waste Heat Recovery Unit | 1. Paper sheets are dried in temperature-controlled sections to control moisture content. 2. Recovery of waste heat from the high-temperature exhaust steam of the dryer 3. After drying, the paper sheet is rapidly cooled to set its shape. |
| Coating/Finishing Stage | Paper coating, calendering, and slitting enhance the surface smoothness of paper products, with custom-cutting to specified dimensions. | 50–70°C (coating), 80–100°C (calendering), ambient temperature (slitting) | 1. Finned-tube heat exchanger 2. Calender Waste Heat Recovery Unit | 1. Maintain a constant temperature for the coating solution to ensure uniform coating. 2. Recover waste heat from the calender to reduce energy consumption. |
| Finished Goods Storage | Finished paper is stored to prevent moisture and deformation, ensuring consistent product quality. | The workshop maintains a constant temperature of 18–25°C and a relative humidity of 50–65% to prevent paper products from becoming damp or curling. | 1. Industrial‑grade constant temperature and humidity storage unit 2. Air Cooler (Industrial Type) | Maintain constant temperature and humidity in the warehouse to prevent finished paper from becoming damp, curling, or deforming, thereby ensuring product quality. |
II. Waste Heat Recovery
| Waste Heat Level | Waste heat source | Recycling equipment | Direction of use |
| High-temperature waste heat (120–180°C) | High-temperature exhaust from dryers, high-temperature heat rejection from cooking kettles, and high-temperature heat rejection from calenders. | High-temperature waste heat recovery unit, steam waste heat recuperator | 1. High-temperature heating for pulp cooking, washing, and bleaching 2. Auxiliary heating during the drying process 3. Process Steam-Assisted Supplement |
| Medium-temperature waste heat (70–120°C) | Heat rejection from the washing tank, heat rejection from the low-temperature section of the dryer, and heat rejection from the press. | Medium-temperature plate heat exchanger + industrial-grade hot water storage tank | 1. Pulp preheating and coating solution temperature control and insulation 2. Hot water for employees’ daily use and workshop heating 3. Preheating of Process Water |
| Low-temperature waste heat (20–70°C) | Heat dissipation from pulping equipment, heat dissipation from forming screens, and condenser heat rejection from constant-temperature and constant-humidity units. | Low-temperature plate heat exchangers, heat pump units (industrial grade, optional) | 1. Preheating of domestic hot water 2. Preheating of fresh air in the workshop and auxiliary temperature control for storage areas 3. After the heat pump raises the temperature, it assists in preheating the pulp. |
III. Paper Type Compatibility
| Types of paper | Core Adjustment Phase | Equipment/Parameter Optimization |
| Cultural paper (writing/printing paper) | Bleaching + Drying + Coating | The heat-exchanger coils in the bleaching stage have been upgraded, improving temperature control accuracy to ±0.5°C; the drying unit has been equipped with an additional low-temperature zone temperature-control module; and the coating‑solution heat exchanger has been densified to ensure uniform coating. |
| Packaging paper (cardboard/corrugated paper) | Pulping + Drying + Finishing | Expand the heat exchangers in the pulping section to accommodate the high heat‑consumption characteristics of waste‑paper pulping; upgrade the dryer unit’s temperature resistance to 180°C to accelerate dewatering; and add a setting‑type cooler to the finishing stage. |
| Specialty paper (thermal/antibacterial paper) | Bleaching + Drying + Coating | The bleaching stage employs a low-temperature, constant‑temperature design (60–70°C) to preserve the unique properties of specialty paper; the drying unit features staged temperature control for precise moisture‑content regulation; and the coating‑solution heat exchanger is designed to prevent contamination. |
| Toilet paper (household paper) | Papermaking + Drying + Finishing | In the paper‑making section, heat exchangers are adapted to high‑humidity conditions and coated with an anti‑corrosion layer; the drying unit employs low‑temperature drying (80–100°C) to preserve the paper’s softness; and a dehumidifying cooler is added to the finishing stage. |
Service Hotline – Engineer Wang
No. 1 Chuangli Road, National Economic and Technological Development Zone, Zengcheng District, Guangzhou City
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