Interactive cyclic solid fuel gasification device with double fluidized beds and method

Abstract

The invention relates to a mutually-cyclical solid fuel gasification device with double fluidized beds and a solid fuel gasification method. The method comprises the following steps: performing a pyrolysis gasification reaction between a solid fuel and a gas for fluidizations and reactions in a fluidized bed gasification reactor so as to generate a combustible gas, as well as solid coke and semicoke which are not subjected to incomplete pyrolysis gasification reaction, wherein the heat required by the pyrolysis reaction is obtained from high-temperature heat-carrying circulating bed materials; feeding the solid coke / the semicoke and the heat-carrying circulating bed materials with heat discharge into a pneumatic back-feeder through a cyclone separator or an overflow device according to a running state in the reactor; controllably sending the solid coke / the semicoke and the heat-carrying circulating bed materials into a combustion reactor; reheating the heat-carrying circulating bed materials due to the combustion of the solid coke / the semicoke in the combustion reactor; and refeeding the heated heat-carrying circulating bed materials into the gasification reactor through a back-feeding device so as to provide the heat for the pyrolysis gasification reaction. Thus, the device is gasified while the running parameters of the bubbling fluidization and the fast fluidization are adapted. As a result, the solid fuel gasification device provided by the invention has the good adaptability for various combustible solids; and the high running efficiency of the whole device is realized.

Description

technical field [0001] The invention relates to an alternating circulation double fluidized bed solid fuel gasification device, which belongs to the technical field of solid fuel energy. The alternating circulation double fluidized bed solid fuel gasification device is suitable for various aspects such as coal gasification and biomass gasification. Background technique [0002] With the rapid progress of today's society, the energy and environmental problems accompanying the development process have become increasingly prominent, which has created a realistic and urgent demand for the improvement of energy production and consumption methods and the development and utilization of new energy technologies. [0003] As far as my country’s national conditions are concerned, the reserves of oil and natural gas are relatively small, especially the gap between oil demand and domestic production is large, and a large amount of oil needs to be imported from overseas oil-producing coun...

AI Technical Summary

Problems solved by technology

The dual fluidized bed devices currently designed for gasification technology mainly include three types: bubbling bed coupled with bubbling bed, bubbling bed coupled with circulating bed, and circulating bed coupled with circulating bed. The type of coupled gasification bed used in the design is limited. The raw material and working parameters of the dual fluidized bed gasification device, this type of device has relatively poor ability to respond to changes in material composition and size, and cannot fully adapt to the actual application under the background of the application of various combustible solid raw materials

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