Application: PSX Jet Cooker - Ethanol Production - Starch Liquefaction
Ethanol (also called ethyl or grain alcohol) is made by converting starch into sugar and then fermenting that sugar into alcohol. This process starts with starch-based grains such as corn, wheat, or rye.
First, the grain is mixed with water to form a slurry (or mash), which is then heated to begin breaking down the starch. In the primary liquefaction stage, the slurry is pumped through a jet cooker, where it is quickly heated to about 221°F (105°C) under pressure. It is held at this temperature for a short time to help break down the starch.
After heating, the slurry is cooled using a flash cooling step. It is then held at a lower temperature ~190°F (88°C) for 1 to 2 hours, allowing enzymes to continue converting the starch into sugars that can later be fermented into ethanol.
- The Jet Cooker is critical to completely heat and hydrolyze the grain mash slurry. The relationship between the Jet Cooker’s steam injector and condensing tube produces a pressure drop that helps maximize shear action and improve starch conversion.
- Alignment of the steam injector and condensing tube is important for optimal operation of the jet. Poor alignment in some brands of jet cookers can lead to artificially high delta P, premature localized wear or internal parts, and increased enzyme usage.
- Poor alignment between the steam injector and condensing tube can also lead to overdriving the condensing tube, which may reduce starch slurry flow rates through the Jet Cooker and increase energy consumption by placing higher demand on the slurry pumps.
PSX Jet Cooker Solution:
The PSX Jet Cooker has a true coaxial design that optimizes rapid heating and thorough mixing for a more complete starch cookout. Multiple bearing surfaces maintain precise alignment between the steam injector and condensing tube, creating a uniform slurry gap and consistent radial flow. The advanced drive system allows controlled positioning and rotation of the condensing tube, enabling accurate pressure drop control while evenly distributing internal wear and extending equipment life.
ProSonix Direct Steam Injection Key Benefits:
- Coaxial injector and condensing tube design ensures uniform mixing and consistent starch conversion.
- Multiple bearing surfaces maintain precise alignment, eliminating uneven wear and improving reliability.
- Easy, reliable, slurry gap adjustment allows control of pressure drop to optimize shear and cooking performance.
- Continuous flow design eliminates fouling surfaces, reducing maintenance and improving uptime.
- Precise temperature control supports repeatable and efficient starch processing.
- AC motor-driven adjustment reduces plant air consumption and improves overall energy efficiency.