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Case Study | Industrial Analytics/Ethanol/FactoryTalk Analytics
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An Agricultural Energy Ethanol Manufacturer

Closed-loop Dryer Process Optimization Increases Ethanol Production

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Case Study | Industrial Analytics/Ethanol/FactoryTalk Analytics
Recent ActivityRecent Activity
An Agricultural Energy Ethanol Manufacturer
Closed-loop Dryer Process Optimization Increases Ethanol Production

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Challenge: Maximize production while controlling costs to meet market dynamics

The United States continues to see sustained demand for fuel ethanol as more and more cities and states have adopted policies encouraging or requiring the use of ethanol in gasoline. Dry grind ethanol production also produces distillers dried grains with solubles (DDGS) and wet distillers grains with solubles (WDGS), which are in demand as livestock feed.

Thus, it’s not surprising that what began as a committee of farmers and business people interested in building a value-added ethanol production facility quickly resulted in a full-scale ethanol plant capable of grinding 13 million bushels of corn, producing 35 million gallons of ethanol, and generating more than 170,000 tons of wet and distillers dried grain per year.

The rapidly growing markets for ethanol, DDGS and WDGS mean that manufacturers face great pressure to maximize production while controlling costs. Because even the smallest variables in the complex production process can impact yield, time to market, operating costs and profit margin, ethanol producers must constantly balance market dynamics with operational efficiencies.

 Row of Corn – Ethanol Company
 

Solution: Capacity Building with Rockwell Software

Soon after it began operations, the forward thinking team at the manufacturer began looking for ways to maximize production capacity and  efficiency at its dry mill. Specifically, the team wanted to increase dryer capacity, decrease energy costs, increase DDGS moisture (and yield) and increase ethanol production through more stable beer column operation.

The team turned to Rockwell Automation, a recognized leader in predictive process control technology and environmental solutions for the ethanol industry. The Rockwell Software Ethanol Solution, from Rockwell Automation, leveraged the powerful FactoryTalk® Analytics platform.

The Rockwell Software Ethanol Solution enabled ethanol companies to drive operational performance to desired business objectives while maintaining regulatory compliance. Powerful capabilities for modeling, control, monitoring, analysis, visualization, warehousing and integration were combined to provide targeted solutions, delivering faster time-to- value and greater cumulative value than alternative solutions.


“The results we have achieved with Rockwell Automation have far exceeded our expectations…The Rockwell Software Ethanol Solution has given us the edge we need to boost our production capacity, with minimal additional investment in plant equipment.”

- Plant Manager, Ethanol Manufacturer


Using The Rockwell Software ValueFirst® customer engagement methodology, the ethanol manufacturer  first worked with Rockwell Software engineers to clearly define requirements, clarify expectations and identify anticipated benefits. The project parameters included optimizing the plant’s evaporator, dryer and thermal oxidizer.

Rockwell Software implemented its Ethanol Solution to optimize dryer performance by predicting and closed-loop control of moisture. The solution utilized a multivariable, non-linear controller that was used to generate and execute dynamic optimization and control. Its continuous process control was able to maximize the ethanol manufacturer’s dryer production 24 hours a day, seven days a week to yield the highest possible returns with the plant’s current equipment configuration.

The controller was designed to shift drying load from dryer to evaporator. It is also customized to reduce heat losses of the thermal oxidizer hotbox temperature, resulting in a decreased need for natural gas. It controls the thermal oxidizer’s process steam header pressure and the syrup evaporator (including syrup solids and steam consumption) in the beer column to manage and stabilize beer column separation with the residual evaporator steam. Rockwell Software also customized the ethanol manufacturer solution to allow for higher average DDGS moisture, which increases DDGS yield.

Results: Increased production with reduced energy

As a result of implementing the Rockwell Software Ethanol Solution, the ethanol manufacturer increased production by 12%. The solution also allowed the plant to significantly reduce its energy usage, resulting in a 9.9% increase in energy efficiency.

Key Benefits
• 12% increase in ethanol production
• 12% increase in throughput
• 9.9% increase in energy efficiency
• 3.3% reduction in standard deviation in dryer moisture
 

The ethanol manufacturer realized these significant benefits with minimal additional investment in plant equipment. The team estimates that the total value of the installation  is more than $2.5 million per year based on industry average marginal values and cost of natural gas. The impressive project results demonstrate the significant amount of capacity hidden in production processes, readily available with the right process control solution.

Process performance flow rate ethanol production

Published August 11, 2021

Tags: Oil & Gas, Industrial Analytics, Energy, Sustainability, FactoryTalk Analytics
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