Jet pipe, fluidized bed reactor with jet pipe and coal catalyzing and gasifying method

Abstract

The invention relates to a jet pipe, a fluidized bed reactor with the jet pipe and a coal catalyzing and gasifying method. A plurality of jet pipes which are in a bed-layer dispersing manner are adopted for feeding oxygen; the jet pipes are in a sleeve type structure; a central pipe is supplied with a mixture gas of oxygen and over-hot steam; the over-hot steam is supplied into annular spaces; the ratio of the oxygen to the over-hot steam is regulated to control the oxygen concentration to be within a certain range; the oxygen and a carbon material are mainly subjected to combustion strong exothermic reaction at a jet flow area; the released heat is used for providing heat for the gasification reaction in the reactor; the over-hot steam supplied into the annular spaces can intensity the internal circulation of carbon material granules, is subjected to heat exchange with a high-temperature gas at a central pipe area, and at the same time provide heat for the gasification heat absorption reaction in the annular spaces, so that partial high-temperature areas are prevented from happening through rapid heat exchange and gasification heat absorption reaction, and the happening rate that the jet pipe area has slag build-up is reduced.

Description

technical field [0001] The invention relates to the technical field of coal catalytic gasification, in particular to a jet tube, a fluidized bed reactor with the jet tube and a coal catalytic gasification method. The invention is not only applicable to the coal catalytic gasification process, but also applicable to the oxygen-gasification process of coal with low ash melting point and easy slagging and the co-gasification process of coal and biomass. Background technique [0002] With the rapid economic development and increasingly stringent environmental protection regulations, in the next ten years, my country's demand for natural gas, a clean energy source, will grow explosively. Although the production of natural gas has increased, it is far below the demand, and there is a contradiction between supply and demand. Increasingly prominent, the supply gap is increasing year by year. In view of the characteristics of my country's energy resource status of "rich in coal, low ...

AI Technical Summary

Problems solved by technology

Although it can provide higher gas-solid contact efficiency than a single jet fluidized bed, for a jet fluidized bed with a higher bed layer, due to the slower turbulence of solid particles back mixing, multiple jet nozzles are distributed on the same horizontal plane It is difficult for the local high temperature formed on the bed to quickly transfer to the whole bed, and it is also easy to slagging

[0009] The existing single-jet fluidized bed and multi-jet fluidized bed gasification devices all have the problem of low gas-solid contact efficiency and easy formation of local high-temperature areas leading to slagging, especially for jet fluidized beds with higher beds. Due to the slow back-mixing turbulence of solid particles, the local high temperature formed by multiple jet nozzles distributed on the same horizontal plane is difficult to quickly transfer to the whole bed, and it is also easier to slagging

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