Ethanol or alcoholic fermentation is a biological conversion process of sugar to alcohol ethanol and carbon dioxide as by-product. Alcoholic fermentation is conversion process in the absence of oxygen, and therefore it is considered as anaerobic process. Ethanol fermentation has many uses, including the production of ethanol fuel, bread cooking and more than several alcoholic beverages like wine, mead, beer, whiskey, vodka,rice wines (including sake) and rum. All fermentation processes perform in a vessel that allows carbon dioxide to escape but prevents outside air from coming in due to contamination of the brew by unwanted bacteria reduction.
Primary Process Control Improvements for Alcohol Processes
Prior to any advanced process control (APC) project, even in alcohol processes, base-level PID tuning and optimization is a critical pre-requisite step. Unless base-level PID control loops are well tuned, advanced process control (APC) cannot work well, since advanced process control (APC) will be manipulating the setpoints of the base-level PID control loops. Therefore, the first necessary step in the overall process control improvement procedure for alcohol processes is PID tuning and optimization of primary or base-level PID controllers. The benefits of PID tuning and optimization in alcohol unit is the reduction of the oscillation amplitude or increase of the controller action by a factor of 2 or 3. This allows to enable smoother running of the alcohol plant with increased stability in all control loops avoiding unnecessary alcohol plant problems such as: damage and/or to fast wear and tear of the equipment, plant irregular shutdowns or off spec product properties and/or grades.
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PiControl Solutions LLC has extensive experience in PID tuning and optimization for alcohol industry controllers.
We understand and know how to tackle with typical PID control loop problems and have customized PID tuning and optimization software tools to help optimize all alcohol unit controllers.
Our unique and novel closed-loop system identification technology makes it possible to tune and optimize base-level PID control loops quickly, efficiently and precisely. With our closed-loop technology we can perform system identification and PID tuning optimization of the following critical base-level PID controllers easily.
Moreover, all process and data analysis and PID tuning and optimization work can be easily performed remotely by PiControl Solutions LLC process control engineers.
Advanced Process Control (APC) Improvements for Alcohol Processes
PiControl Solutions LLC has experience in advanced process control optimization for alcohol processes.
We understand the economics factors that drive the profit margin and have customized multivariable closed-loop system identification and advanced process control (APC) design and optimization tools to help optimize and improve the alcohol units.
Because of the relatively small size of many alcohol plants, it is more cost-effective to implement DCS-based APC (advanced process control) rather than model predictive control(MPC) techniques. DCS-based APC (advanced process control) approach is fast, cost effective, all inside the existing DCS/PLC, avoiding the complications of OPC/other data communication links from computer to DCS.
Alcohol facilities can have many different process and process control configurations. Alcohol processes such as ethanol and methanol processes are prime candidates for DCS-based advanced process control (APC) technology. We focus to analyze the process and provide the right economic advanced control solution for each alcohol plant. Our DCS-based APC (advanced process control) methodology has proven particularly successful in this alcohol area. Our DCS-based APC (advanced process control) design will result in the following alcohol benefits:
- Increase ethanol production rate by automatically identifying and pushing against the active constraint, continuously in real-time. Constraints include process, equipment, economic or market constraints at any given time. The overall approach constantly moves the process in the most profitable direction.
- Minimize fermentation batch cycle time using adaptive sequence technology. This increases the overall ethanol throughput because of increase in fermenter capacity.
- Maximize fermentation yields to ethanol by optimizing fermentation process conditions using both the online real-time optimizer.
- Minimize alcohol losses in the three distillation column product streams by improved control of distillation variables and product specifications using various advanced process control schemes. The control schemes minimize alcohol losses from stillage, fusel oil and water.
- Increase alcohol content of the beer and reduce overall energy consumption by optimizing fermentation temperature.
- Minimize water addition to ferment beer mash with higher levels of solids. This reduces the cost of handling and treating the water later. In addition, higher solids result in higher “beer” yields in the same or less time.
- Increase overall process automation thus reducing the level of manual intervention needed from control room operators, thereby allowing them focus on more important, potentially money-saving tasks.
- Improve plant-wide process control quality by reducing deviation of product specifications and other critical controlled variables from their setpoints.
Our DCS-based APC (advanced process control) technology works on all types of alcohol processes. For alcohol units, we ensured2 – 4 % increase inprofits. There are other benefits from our DCS-based APC (advanced process control) technology, such as: smoother plant operation, automated loading and unloading and less work for the operators.
After all DCS work on advanced process control (APC) schemes is complete and all advanced process control (APC) parameters are calculated and optimized, PiControl Solutions LLC will over factory acceptance test (FAT) make sure that the advanced process control (APC) design is complete, correct and operable. After completion of process control (APC) control project, PiControl Solutions LLC will conduct dedicated process control training for alcohol company.
For the ethanol Process, we provide advanced process control (APC) design and optimization for the following areas:
The milled grain is mixed with process water, the pH is adjusted to about 5.8, and an alpha-amylase enzyme is added. The slurry is heated to 180-190°F for 30-45 minutes to reduce viscosity.
The slurry is then pumped through a pressurized jet cooker at 221°F and held for 5 minutes. The mixture is then cooled by an atmospheric or vacuum flash condenser.
After the flash condensation cooling, the mixture is held for 1-2 hours at 180-190°F to give the alpha-amylase enzyme time to break down the starch into short chain dextrins. After pH and temperature adjustment, a second enzyme, glucoamylase, is added as the mixture is pumped into the fermentation tanks.
Once inside the fermentation tanks, the mixture is referred to as mash. The glucoamylase enzyme breaks down the dextrins to form simple sugars. Yeast is added to convert the sugar to ethanol and carbon dioxide. The mash is then allowed to ferment for 50-60 hours, resulting in a mixture that contains about 15% ethanol as well as the solids from the grain and added yeast.
The fermented mash is pumped into a multi-column distillation system where additional heat is added. The columns utilize the differences in the boiling points of ethanol and water to boil off and separate the ethanol. By the time the product stream is ready to leave the distillation columns, it contains about 95% ethanol by volume (190-proof). The residue from this process, called stillage, contains non-fermentable solids and water and is pumped out from the bottom of the columns into the centrifuges.
The 190-proof ethanol still contains about 5% water. It is passed through a molecular sieve to physically separate the remaining water from the ethanol based on the different sizes of the molecules. This step produces 200-proof anhydrous (waterless) ethanol.
During the ethanol production process, two valuable co-products are created: carbon dioxide and distillers grains. As yeast ferment the sugar, they release large amounts of carbon dioxide gas. It can be released into the atmosphere, but it is commonly captured and purified with a scrubber so it can be marketed to the food processing industry for use in carbonated beverages and flash-freezing applications. The stillage from the bottom of the distillation tanks contains solids from the grain and added yeast as well as liquid from the water added during the process. It is sent to centrifuges for separation into thin stillage (a liquid with 5-10% solids) and wet distillers grain. Some of the thin stillage is routed back to the cook/slurry tanks as makeup water, reducing the amount of fresh water required by the cook process. The rest is sent through a multiple-effect evaporation system where it is concentrated into syrup containing 25-50% solids. This syrup, which is high in protein and fat content, is then mixed back in with the wet distillers grain (WDG).
PiControl is an innovative process control software and services company that offers state of-the art, modern solutions at a lower cost, implemented in shorter time compared to
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