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In this paper, a hybrid dynamic model of de-humidifier is proposed to predict heat and mass transfer process in packed-bed liquid desiccant dehumidification system. Based on the heat and mass balance principles, and using lumped parameters method, two difference equations with seven parameters for predict the outlet air temperature and humidity ratio are derived. The unknown model parameters are identified...
Liquid Ethylene Gas (LEG), which is stored at − 103.7 °C and 0.1 MPa, is usually transported by vessels with a vacuum insulated tank over oceans and lakes, or along rivers. A part of LEG would be vaporized into Boil-Off Gas (BOG) due to the inevitable heat leakage. To guarantee the vessels safety, an on board re-liquefaction plant is widely equipped to condense the BOG and return it to the tank. Improving...
The paper presents a mathematical model and its Matlab/Simulink realization for ball mill coal-pulverizing system (BMCPS). Based on the analysis of mass and energy balance, the physical models for all control-related sub-processes of BMCPS are developed respectively. Then the integrated dynamic mathematic model is constructed with Matlab/Simulink. Validation using the archived data from a power plant...
Hybrid model is a simple and accurate model for stable heat transfer process. Its theoretical basis shows that it is inappropriate to be applied to system with severe coefficient drifting. However, coefficient drifting is normal phenomenon in power and chemical industrial due to fouling. In this paper, a modified hybrid model of heat exchanger is proposed. The derivation of system is based on heat...
Ball mill coal pulverizing system is a multiple-input multiple-output (MIMO) process characterized with strong couplings and nonlinearities. Conventional control methods maybe work well initially, but will deviate from optimal work point for a period of time and even cease to be functionally effective. A multilayer structure with direct control and optimization is presented for the control of ball...
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