Coupling calculation problem between intermittent operation of the slag lock hopper and continuous operation of gasification
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During the process simulation of gasification, to achieve more accurate calculations, the intermittent slag discharge process from the slag lockhopper can be coupled with the gasification process. The approach is as follows: In the full-process simulation calculation of gasification, the slag water enters the slag lockhopper from the self-cooling chamber via a slag breaker. Additionally, intermittent calculations for the slag lock hopper are performed separately, with the processes of flushing, pressurization, slag feeding, and slag discharge being calculated on a distributed basis. This part can be handled using Excel. Then, the circulating streams involved in the calculations are linked to the gasification process, and through repeated iterations, results consistent with the actual process are obtained. It is not yet clear how it will be implemented.
To carry out coupled calculations for the entire gasification process and the intermittent operation of the slag lockhopper, the following steps can be taken: 1. Establish a model of the entire gasification process, including reactors, heat exchangers, separators, etc., to ensure accurate data when operating them individually. 2. Establish a discontinuous operation model for the slag lock hopper, including the processes of flushing, pressurization, slag feeding, and slag discharge, and conduct dynamic simulation using an appropriate time step. 3. Connect the input and output of the slag lockhopper model to the relevant nodes of the gasification model to achieve coupling through circulating streams. This means that the slag discharge from the slag lock hopper affects the gasification process, while the products of the gasification process in turn affect the operation of the slag lock hopper. 4. Use software for iterative calculations; for example, Excel can handle simple data iterations, while for more complex models, Matlab, Aspen Plus, or other process simulation software can be used. 5. For the model parameters, adjustments and optimizations can be made based on actual operational data to ensure that the calculation results match the actual process. 6. Considering that gasification is continuous while the slag lockhopper is intermittent, an appropriate coupling strategy needs to be established. For example, the output data from the slag lockhopper model can be updated periodically to the gasification model, or the gasification products can be fed into the slag lockhopper model on a regular basis for calculation. 7. Verify the calculation results by comparing them with factory data or experimental operation data to ensure the accuracy of the model. By performing iterative calculations until the mass and energy of each stream reach a stable equilibrium, the process simulation results under coupled operation can be obtained. .
The coupled calculation of the intermittent operation of the slag lock hopper and the continuous operation of gasification can be carried out through the following steps: 1. Simulate the slag water cooling chamber and the slag breaking machine process: First, set the simulation parameters based on the process flow, including feed composition, temperature, pressure, etc., to determine the slag breaking efficiency and cooling effect. 2. Develop a model for the intermittent operation of the slag lock hopper: Use Excel to create calculation models for each operational step of the slag lock hopper, including flushing, pressurization, slag feeding, and slag discharge, in order to calculate the material and energy balances for each step. 3. Coupled gasification continuous operation: Connect the material and energy output from the slag lockhopper to the input port of the gasification reactor, in order to establish a dynamic material and energy balance model for the entire gasification process. 4. Set up the iterative calculation process: Through programmed or manual iteration, adjust the operating parameters of the slag lockhopper and the gasification reactor so that the overall process achieves a closed-loop balance in terms of materials and energy. 5. Validate and adjust the model: Use actual operational data to validate and adjust the model to ensure that the calculation results match the real situation. During implementation, it may be necessary to write specialized programs to handle complex iterative and coupled calculations, or to use process simulation software (such as ASPEN PLUS, HYSYS, etc.) to carry out these tasks. It will involve the integration of different areas of expertise, and knowledge in fields such as chemical engineering processes, control engineering, and computer programming may be required. .