How To Reduce The Cost Of Small Extruded-Feed Manufacturing Equipment
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How to Reduce the Cost of Small Extruded-Feed Manufacturing Equipment
1. Precise Parameter Control Cuts Drive-Motor Energy
The drive motor of an extruder accounts for over 60% of total energy consumption. The core of parameter control is a precise match between load and speed. For single-screw extruders producing conventional feed (such as sinking carp feed), control the screw speed at about 300–320 r/min to avoid overloading the motor. When producing highly extruded pet food, do not blindly increase speed - optimize raw-material moisture (about 12–14%) to enhance frictional heat and reduce motor load. For twin-screw extruders, control screw speed and feed rate synchronously to keep the raw material uniformly distributed in the extrusion chamber, avoiding localized overload and energy surges (example: a pet-food plant reduced speed from 350 to 320 rpm and feed rate from 120 to 110 kg/h, lowering unit energy cost from about 380 to 320 yuan/ton without affecting pellet uniformity - example data). Also avoid idle operation and shut down promptly during production breaks.
2. Optimize Heating and Cooling Systems
- Steam pressure: for ordinary pet/fish feed, 0.3–0.4 MPa is usually sufficient; keeping pressure below 0.5 MPa can reduce boiler energy consumption by 15–20%.
- Waste-heat recovery: pipe hot exhaust from the extruder outlet to the raw-material preheating chamber (preheat to 40–50 °C); install recovery devices on cooler exhaust for workshop heating or hot water (example: a fish-feed plant preheated raw material to 50 °C and cut steam-boiler energy by 18% - example data).
- Cooling maintenance: for dry-type machines, keep heat sinks and cooling fins clean so the machine does not overheat and overload.
3. Energy-Saving Retrofits and Operation Management
| Measure | Typical saving | Note |
|---|---|---|
| Variable frequency drive (VFD) | 10–15% energy | Best for small-batch, multi-batch production |
| Electromagnetic heating coils | Heating energy −25% | Thermal efficiency rises from about 70% to over 95% |
| Production scheduling | Avoid start/stop loss | Start-up consumes about 1.5× normal running energy (industry experience) |
| Lubrication | Lower friction loss | Regularly lubricate bearings and gears |
4. Safety Note
All electrical retrofits (VFD, electromagnetic heating) must be carried out by qualified electricians with the power disconnected and locked out (LOTO); only trained operators may adjust process parameters.
