Solution
Textile printing and dyeing industry
I. Recommended Production Processes and Equipment
| Process steps | Core technical movements | Critical temperature parameters | Equipment Recommendations | Core Use |
| Pre-treatment (desizing, scouring) | Desizing, scouring, and bleaching of fabrics to remove impurities. | Room temperature → 95–100°C (scouring) / 80–90°C (bleaching) | 1. Shell-and-tube heat exchanger (for heating applications) 2. Medium-Temperature Waste Heat Recovery Unit | 1. Heating and maintaining a constant temperature of the scouring/bleaching solution 2. Recovery of waste heat from cooking, scouring, and bleaching wastewater |
| Dyeing process | Fabric dyeing and color fixation, including high-temperature dyeing and low-temperature color fixation. | 60–130°C (dyeing) → 40–60°C (color fixing) | 1. Heat exchanger specially designed for dyeing machines 2. Screw-type refrigeration unit 3. Steam Waste Heat Recovery Unit | 1. Precise temperature control of the staining solution 2. After dyeing, cool down, fix the color, and control the temperature. 3. Recovery of waste heat from dyeing machine exhaust gases |
| Printing stage | Fabric printing, drying, and color fixing | 80–100°C (drying) → 130–160°C (color fixing) | 1. Finned-tube flue gas heat exchanger 2. Plate Heat Exchanger (Drying and Heating) | 1. Recovery of waste heat from drying exhaust gases 2. Heating during the drying and color-fixing stages |
| Forming stage | Fabric stretching and setting to remove wrinkles and stabilize dimensions. | 150–180°C (setting) → 60–80°C (cooling) | 1. Waste Heat Recovery Unit for Textile Setting Machines 2. Plate Heat Exchanger 3. High-Temperature Heat Exchange Unit | 1. Recovery of waste heat from high-temperature exhaust gases of setting machines 2. Rapid cooling of the fabric after setting 3. High-temperature heating in the shaping stage |
| Finishing (washing, softening) | Fabric washing, softening treatment, and dehydration | 30–50°C (machine wash), room temperature (spin dry) | 1. Low-Temperature Waste Heat Recovery Unit 2. Chiller unit | 1. Recovery of wastewater from water washing and waste heat from cooling systems 2. Cooling of the fabric after dehydration, followed by constant-temperature water washing. |
| Finished Goods Storage | Finished fabric storage, moisture protection | The workshop maintains a constant temperature of 20–28°C and a relative humidity of 60–70%. | 1. Constant Temperature and Humidity Air Conditioning Unit 2. Air Cooler | Maintain constant temperature and humidity in the warehouse to prevent fabrics from becoming damp or deforming. |
II. Waste Heat Recovery
| Waste Heat Level | Waste heat source | Recycling equipment | Direction of use |
| High-temperature waste heat (100–180°C) | Waste gases from setting machines, waste heat from dye-fixing machines, and exhaust steam from dyeing machines. | Textile finishing machine exhaust heat recovery unit, steam waste heat recovery unit | 1. Pre-treatment: boiling and scouring/bleaching with heating 2. Heating during the dyeing process and heating during the printing drying process 3. Process Steam-Assisted Supplement |
| Medium-temperature waste heat (60–100°C) | Scouring/bleaching wastewater, dyeing wastewater, and heat‑removal effluent from post‑finishing cooling processes | Medium-temperature plate heat exchanger + hot water storage tank | 1. Preheating of process water (pre-treatment, dyeing) 2. Hot water for employees’ daily use 3. Workshop Heating in Winter |
| Low-temperature waste heat (30–60°C) | Wastewater from water washing, waste heat discharged during dehydration and cooling, and condenser waste heat from refrigeration units. | Low-temperature plate heat exchanger, heat pump unit (optional) | 1. Preheating of domestic hot water 2. Preheating of fresh air in the workshop and auxiliary temperature control for storage 3. Preheating process water with heat pump‑assisted temperature increase |
III. Textile Category Matching
| Textile Category | Core Adjustment Phase | Equipment/Parameter Optimization |
| Cotton textile | Pre-treatment + Dyeing + Setting | Prior to capacity expansion, the waste heat recovery unit was modified to accommodate the high water‑consumption characteristics of cotton spinning; a anti‑clogging module was added to the dyeing machine’s heat exchanger; and the waste heat recovery efficiency of the setting machine was increased to 90%. |
| Synthetic fabric | Dyeing + Setting | The dyeing machine’s temperature control accuracy has been improved to ±0.3°C, meeting the high-temperature dyeing requirements of synthetic fibers; the heat exchanger unit of the setting machine has been upgraded to withstand temperatures up to 220°C; and a dedicated cooling module for synthetic fibers has been added. |
| Knitted fabric | Sizing + Finishing | The cooling unit of the setting machine has been expanded to meet the rapid cooling requirements of knitted fabrics; the post‑finishing chiller has been upgraded to a low‑temperature model to prevent fabric deformation; and the humidity control accuracy in the warehouse has been improved to ±3%. |
| Printed fabric | Printing + Color Fixing + Drying | An efficient filtration device has been added to the finned-tube flue-gas heat exchanger to prevent clogging by printing dust; the waste-heat recovery unit of the color-fixing machine has been upgraded in capacity; and a waste-heat recycling module has been installed in the drying section. |
Service Hotline – Engineer Wang
No. 1 Chuangli Road, National Economic and Technological Development Zone, Zengcheng District, Guangzhou City
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