Gasification furnace

Abstract

A gasification furnace has a gasification chamber for pyrolyzing a raw material in a fluidized medium being fluidized therein to produce a pyrolysis gas and a pyrolysis residue. The gasification furnace also has a combustion chamber for receiving the pyrolysis residue together with the fluidized medium, combusting the pyrolysis residue in the fluidized medium being fluidized therein to heat the fluidized medium, and returning the fluidized medium to the gasification chamber. The gasification furnace includes a partition wall for separating the gasification chamber and the combustion chamber from each other. The partition wall includes a first steel plate having a cooling structure to prevent the pyrolysis gas from flowing between the gasification chamber and the combustion chamber. The gasification furnace allows a general material to be used for components therein and have a long repair period.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a gasification furnace, and more particularly to a fluidized-bed gasification furnace suitable for producing a gas from a raw material such as various wastes and solid fuel. [0003] 2. Description of the Related Art [0004] There have heretofore been known fluidized-bed gasification furnaces for producing a gas from solid fuel such as coal or organic wastes. Such fluidized-bed gasification furnaces include an integrated gasification furnace 910 as shown in FIG. 1. The integrated gasification furnace 910 has an integrated structure including a gasification chamber 901, a char combustion chamber 902, and a partition wall 915 to separate the gasification chamber 901 and the char combustion chamber 902 from each other. The integrated gasification furnace 910 includes a fluidized medium C circulating between the gasification chamber 901 and the char combustion chamber 902. The fluidized med...

AI Technical Summary

Benefits of technology

[0006] The present invention has been made in view of the above drawbacks. It is, therefore, a first object of the present invention to provide a gasification furnace which allows a general material to be used for components therein and have a long repair period.

[0007] According to an aspect of the present invention, there is provided a gasification furnace which allows a general material to be used for components therein and have a long repair period. The gasification furnace has a gasification chamber for pyrolyzing a raw material in a fluidized medium being fluidized therein to produce a pyrolysis gas and a pyrolysis residue. The gasification furnace also has a combustion chamber for receiving the pyrolysis residue together with the fluidized medium, combusting the pyrolysis residue in the fluidized medium being fluidized therein to heat the fluidized medium, and returning the fluidized medium to the gasification chamber. The gasification furnace includes a partition wall for separating the gasification chamber and the combustion chamber from each other. The partition wall includes a first steel plate having a cooling structure to prevent the pyrolysis gas from flowing between the gasification chamber and the combustion chamber.

[0009] A combustion gas can be produced in the combustion chamber 2. The partition wall can prevent the combustion gas from flowing between the gasification chamber and the combustion chamber. Thus, the gasification furnace can be a separation-type gasification furnace, which separately produces a combustible gas and a combustion gas.

[0011] As described above, the partition wall has a structure to prevent the pyrolysis gas from flowing between the gasification chamber and the combustion chamber. For example, a gas produced in one of the chambers may be extracted, controlled, and supplied to the other of the chambers. Particularly, it is desirable to extract such a gas at a location other than the partition wall. For example, a gas may be extracted through a path connected to the partition wall and supplied to the other of the chambers. Such an arrangement is included in a partition wall having a structure to prevent the pyrolysis gas from flowing between the gasification chamber and the combustion chamber.

[0012] The gasification chamber and the combustion chamber are configured so that gases are prevented from flowing between the gasification chamber and the combustion chamber. Accordingly, gases in the respective chambers can be separated from each other without being mixed with each other. Since the gasification chamber and the combustion chamber are separated by the partition wall including a first steel plate having the cooling structure, a lifetime of the partition wall can be prolonged.

Problems solved by technology

Further, in a case where the partition wall 915 is made of ceramics or brick, the partition wall 915 is likely to be cracked because of its brittleness.

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