Wheat is grown all over the world for its highly nutritious and useful grain. It is one of the top three most produced crops in the world, along with corn and rice.
Although not as popular as corn in the United States for first generation biofuel production, wheat is an important feedstock in other parts of the world.
Coproducts of biofuel production include DDGS and gluten, which constitutes 80 to 90 percent of the wheat protein.
Distillers Dried Grains with Solubles (DDGS)
Distillers grain is an important co-product of grain biofuel production. The biofuel production process uses only the starch portion of the grain, which is about 70% of the kernel. All the remaining nutrients - protein, fat, minerals and vitamins - are concentrated into distillers grain, a valuable feed for livestock.
Distillers grain can be fed to livestock wet or dry. Distillers Dried Grain with Solubles (DDGS) is the most common variety and is a high quality feedstuff ration for dairy cattle, beef cattle, swine, poultry and aquaculture.
DDGS is created when the liquid that is separated from the mash during the distilling process is concentrated in an evaporator, then added back onto the dried distillers grain.
Drying the distillers grain increases its shelf life and improves its ability to be transported over longer distances. Dedert Ring Dryers are ideal for drying DDGS. Our Ring Dryers provide co-current drying which gives gentle treatment of distillers grain, resulting in higher product quality. A plant can take advantage of the waste heat available in the dryer exhaust by coupling the Dedert Ring Dryer to a Dedert Evaporator (see Integration).
Vital Wheat Gluten
Gluten is particularly important in the manufacture of starch from wheat; gluten is a very valuable by-product representing half the turnover. In fact the starch is by some manufacturers considered the by-product and gluten the main product.
If gluten is extracted and gently dried in hot air at moderate temperatures it maintains its vitality. “Vital wheat gluten” may be added as a dry powder to flour otherwise low in protein and thereby improve the baking qualities of the flour.
Dedert Ring Dryers with their gentle drying and short residence time are ideal for drying gluten.
A and B Starch
The difference between A and B starch is not only the size of the granules but their water content.
A starch is made up of mostly large granules, 25-35 um, with low protein content.
B Starch has smaller particles, 2-8 um, with a higher protein content. The smaller granules have more surface area and therefore bind more water to them than the larger A granules.
A and B Starch Drying
A and B Starch derived from wheat processing can be dried on Dedert's specially designed Flash Dryers.
A Starch is usually dried on a single pass Flash Dryer with specifically designed feed components. Bag-house collection is preferred due to the particle size distribution, however progress has been made with cyclone collection combined with pneumatic discharge.
B Starch is usually dried on Ring Dryers. Slurry is fed at 35% moisture content and the final product is dried to 10-12% final moisture. Bag-filter collection is preferred to cyclone collection due to the particle size distribution.
For more detail on Dedert Dryers and Evaporators for the wheat industry, please see our Technologies pages.