Fluidized-bed fly ash back-to- furnace gasification apparatus and method

Abstract

The present invention provides a fluidized-bed fly ash back-to- furnace gasification apparatus and method, and belongs to the technical field of coal gasification, fly ash back-to- furnace can be efficiently converted, at the same time, and distribution of the flow field inside a gasifier is more uniform. The fly ash back-to- furnace gasification apparatus includes a fly ash injection device, the fly ash injection device includes an inner layer channel and an outer layer channel, the inner layer channel is used for introducing an oxygen-containing gasification agent, the outer layer channel is used for introducing a backing fly ash blowing gas and fly ash mixture, or the inner layer channel is used for introducing the backing fly ash blowing gas and fly ash mixture, and the outer layer channel is used for introducing the oxygen-containing gasification agent, so that fly ash and the oxygen-containing gasification agent can be fully mixed at an outlet and injected into the gasifier for combustion reaction. The fluidized-bed fly ash back-to- furnace gasification apparatus can be used for fly ash handling in coal gasification process.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a fluidized bed fly ash returning furnace gasification equipment and method. Background technique [0002] China's coal-based energy structure will hardly change fundamentally for a long period of time in the future. How to strengthen the clean and efficient comprehensive utilization of coal is an important direction for the development of coal chemical technology. Among many technologies, coal gasification is the most efficient and clean utilization of coal. One of the core technologies. [0003] The current relatively advanced fluidized bed gasification process has the characteristics of sufficient gas-solid material mixing, which is beneficial to heat transfer, mass transfer and gasification reaction, and is the most mature process in coal gasification process. A fluidized bed refers to suspending a large number of solid particles in a moving fluid, so that the part...

AI Technical Summary

Problems solved by technology

but if figure 1 As shown, in the existing fly ash gasification technology, the separated fly ash is sent to the gasification zone instead of the combustion zone under the push of the return ash blowing air, so that it cannot be gasified in the presence of oxygen. The combustion is complete under the action of the agent, which reduces the carbon conversion rate of the fly ash

In addition, the fly ash enters the gasification zone from one side of the gasification furnace, and the introduction of the fly ash airflow will cause the flow field in the gasification furnace to produce bias flow and short circuit, resulting in uneven temperature distribution in the furnace. In severe cases, There will also be phenomena such as slagging in the furnace and inability to return ash, which will affect the normal operation of the gasifier

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