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China's coal-based energy structure determines the strategic position of clean coal technology in solving China's energy and environmental problems. Coal gasification is an important sub-project of clean coal technology, and it is also the core of coal-fired combined cycle based on gasification. As a gasifier for the main equipment of coal gasification, the study of mathematical models not only helps to understand its dynamic and static characteristics, but also provides valuable guidance for design and production. In this paper, a dynamic mathematical model of a bubbling fluidized bed gasifier was established and simulated.
Compared with other forms of gasification process, the fluidized bed gasifier uses a fluidized bed technology and a circulating coke heat, and the combustion bed and the gasification bed are operated separately to produce a relatively coarse gas containing no N, and the calorific value is high. . At the same time, due to the large amount of thermal coke circulation, the bed carbon concentration is high, and the gasification chamber temperature is maintained at 850-950 ° C, which enhances the water gas reaction and high yield. The system process is simple and relatively independent.
In order to describe in detail the changes in the concentration and temperature of various substances in the gasifier system, and to avoid the complexity of the model, the gasification hearth system is divided into continuous chambers along the main flow direction of the material. Any chamber is set as an ideal reactor, and the parameters such as pressure and temperature are considered constant in the small chamber, that is, the segmental concentration parameter method is adopted. Each chamber is considered for its unsteady equilibrium of matter and energy, and the flow, coal particle conversion and chemical reaction between the gases are analyzed.
The flow model divides the gasification chamber into a bubble phase and an emulsion phase in the model, and considers that the emulsion phase is in a minimum fluidization state, and the remaining gases flow through the emulsion phase in the form of bubbles.
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