Chemical Loop Solids Flow Control for Stable Multi-Loop Operation
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Solution Overview
Problem
Control and optimization of chemical looping processes in power generation and gasification plants are complex due to the transport of solids and chemical and thermal reactions, which introduce variables like time delay and reaction rates, complicating the management of multiple-loop systems.
Innovation Solution
A control system with sensors measuring parameters such as solids' height, volume, and mass flow rate is implemented, generating data signals to regulate the flow of solids through chemical loops, using a data acquisition system and controller to adjust valve positions and maintain desired operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple chemical looping loops are implemented to increase power generation capacity, then productivity is improved, but device complexity increases due to multiple valves, sensors, and control interactions
Solution Approach 1:
The system is divided into multiple independent chemical looping loops, each with its own set of valves and sensors. This segmentation allows each loop to be controlled independently while contributing to overall power generation capacity, making the complexity manageable through modular design
Solution Approach 2:
The control system is designed to universally manage multiple loops with similar operational characteristics. The same types of valves, sensors, and control algorithms are applied across different loops, allowing the system to handle increased capacity while using standardized components that simplify operation and maintenance
2Adaptability or versatility
If solids transport is used to carry oxygen between reactors, then the chemical looping process is enabled, but measurement precision deteriorates due to difficulties in measuring solids flow rate and inventory accurately
Solution Approach 1:
Indirect measurement methods are used as intermediaries to measure solids parameters. Instead of directly measuring solids flow rate and inventory, the system measures related parameters such as pressure drops, gas flow rates, and reactor levels, then calculates solids parameters from these measurements, improving measurement precision without changing the solids transport mechanism
Solution Approach 2:
The system replaces direct mechanical measurement of solids with non-intrusive measurement techniques. Sensors measure gas phase parameters, pressure differentials, and electrical properties to infer solids characteristics, avoiding the complexity and imprecision of direct solids measurement while maintaining process capability
3Productivity
If chemical reactions are used to capture and release oxygen, then power generation efficiency is improved, but stability deteriorates due to time delays and reaction rate variations
Solution Approach 1:
The control system performs preliminary actions by predicting future process states based on current measurements and reaction kinetics models. Control adjustments are made in advance to compensate for known time delays in chemical reactions, maintaining stability while allowing efficient reaction processes to operate
Solution Approach 2:
The system implements continuous feedback control where sensor measurements of reactor conditions, gas flows, and solids circulation are constantly monitored and fed back to the control system. This feedback allows real-time adjustments to maintain stable operation despite variations in reaction rates, while still achieving high power generation efficiency through optimized chemical looping processes
Data Source
AI summary
A control system for optimizing a chemical loop system includes one or more sensors for measuring one or more parameters in a chemical loop. The sensors are disposed on or in a conduit positioned in the chemical loop. The sensors generate one or more data signals representative of an amount of solids in the conduit. The control system includes a data acquisition system in communication with the sensors and a controller in communication with the data acquisition system. The data acquisition system receives the data signals and the controller generates the control signals. The controller is in communication with one or more valves positioned in the chemical loop. The valves are configured to regulate a flow of the solids through the chemical loop.