JPH03131687A - Fluidized bed oven for gasification - Google Patents

Abstract

PURPOSE:To provide a compact and inexpensive fluidized bed oven contriving the smooth combustion of char by generating a regular circulation flow in at least one part of a fluidizing medium in the fluidizing medium-holding portion of the fluidized bed oven. CONSTITUTION:One portion or all of a structure for holding a fluidizing medium 2 in a fluidized bed oven 1 is inclined and/or a baffle 10 is disposed in the fluidizing medium in the fluidized bed. The fluidized bed oven 1 is equipped with an organic carbon raw material-charging inlet 4 and with a char-charging inlet 9 at the upstream side, thereby permitting to generate a desired regular circulation flow in one part or all of the fluidizing medium 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gasification fluidized bed furnace, and particularly to a compact and inexpensive gasification fluidized bed that achieves smooth combustion of char.

[Prior Art] Various devices have been developed and applied to gasify organic carbon raw materials by thermal decomposition, but all of them require treatment of char generated during gasification. Although char is easily collected using conventional dust collection techniques, it is usually combusted within the system in order to effectively utilize its high combustion heat.

[Problem to be solved by the invention]

The char generated during gasification is generally inferior in reactivity to the gasification raw material, so various measures are required to obtain satisfactory combustion, such as installing a two-stage combustion system or an independent combustion chamber. Methods such as combustion are well known.

The present invention provides a gasification fluidized bed furnace capable of generating a regular circulating flow in at least a portion of the fluidized medium in the fluidized medium holding part of the fluidized bed furnace, and using this circulating flow to achieve smooth combustion of char. The purpose is to provide

[Failure to solve the problem]

In order to achieve the above object, the present invention provides a fluidized bed furnace for pyrolyzing and gasifying an organic carbon raw material, in which a fluidized bed furnace is used to generate a desired regular circulation flow in part or all of the fluidized medium. The structure of the fluidized medium holding bottom of the bed furnace, generally a perforated plate or a bubble holding plate through which the gasification fluid is jetted, is sloped in part or in its entirety, and/or baffles are provided in the fluidized medium of the fluidized bed furnace, The fluidized bed gasification furnace is characterized in that the fluidized medium is provided with an input section for organic carbon raw material and an input section for char on the upstream side thereof.

In the present invention, the degree and range of inclination, the dimensions and mounting position of the baffle, etc. must be individually planned depending on the amount and characteristics of the raw material and generated char. However, the degree of inclination is determined by the angle of repose of the fluidizing medium and the arrangement of the gasification fluid nozzle, and the range of inclination and the dimensions and installation position of the baffle are determined by the following:
It is determined by the circulation scale of the fluid medium necessary for smooth processing of char, etc. The shape of the baffle may be a flat plate, and it is installed in the height of the stationary layer of the fluid medium.

[For production]

In the present invention, in a fluidized bed furnace, a part or all of the structure at the bottom of the fluidized medium is sloped, and baffles are provided in the fluidized medium, so that the fluidized medium has a desired regular circulating flow. Since the circulating fluid medium section is equipped with a char input section on the upstream side, that is, on the side closer to the gasification fluid supply port, the char first comes into contact with the gasification fluid, Since it burns and consumes oxygen, it becomes easier to burn the char preferentially to the raw material.

〔Example〕

Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a longitudinal cross-sectional structural diagram of a fluidized bed furnace showing one embodiment of the present invention. In FIG. 1, the entire distribution plate that holds the fluidized medium and jets out the gasified fluid is sloped and baffles are used.

In FIG. 1, ``■'' is a fluidized bed furnace, and the fluidized medium 2 constitutes a circulating heating medium section of the fluidized bed furnace 1, and is fluidized by the supply of gasified fluid 3. Reference numeral 4 is an input port for organic carbon raw material, which is a gasification raw material, and 9 is an input port for char, etc. The product gas enters a dry precipitator 6 from the product gas outlet 5, where char is separated and fed into the fluidized medium 2 from the input port 9.

Next, the operating state shown in FIG. 1 will be explained. When the gasification fluid 3 and the gasification raw material 4 are supplied in a state where the fluidized medium 2 in the fluidized bed furnace 1 has reached a predetermined temperature, the fluidized bed furnace 1 exhibits a fluidized state,
The gasification raw material input from 4 is thermally decomposed in a short time, gasified, and accompanied by solid content such as char of the reaction product, enters the dry dust collector 6 from the product gas outlet/population 5, where it is collected. Most of the char etc. 8 are separated, and the resulting sulphate is suitable for the next step and further purified if necessary.

On the other hand, the fluidized medium 2 in the fluidized bed furnace 1 partially or completely exhibits a regular circulating flow due to the slope of the bottom and the baffle 10.

In the above, when the char, etc. 8 is connected to the char, etc. input hole 9, the char rides a part of the flow shown in the figure, mixes with the high-temperature fluidizing medium 2 containing almost no combustion material, and passes through the gasified fluid jetting part 11. When it comes into contact with the gasification fluid 3, it instantly burns and generates high temperature, thereby thermally decomposing the gasification raw material supplied to the downstream side. Note that the material (■) is preferably a fine ceramic material from the viewpoint of heat resistance and wear resistance, but is not limited thereto.

FIG. 2 shows a partial longitudinal sectional view of another embodiment of the present invention in which the bottom of a fluidizing medium is partially inclined. Also in FIG. 2, due to the baffle 10 and its partial slope, a portion of the fluidizing medium forms a regular circulation flow with the gasified fluid. This is used in the case of relatively large-scale gasification fluidized bed furnaces or when relatively small amounts of char treatment are required, ie when it is not necessary to cause a regular circulation flow through the fluidized medium.

Further, the ejection holes of the gasified fluid ejection part 11 are appropriately arranged and oriented as shown in FIG. 3, which is a view taken along the line X--X in FIG. 1, for example, in order to meet the intended purpose. In other words, no ejection holes are provided in the hatched Z//-n, or even if they are provided, the ejection holes are provided to the extent that the circulation of the fluid medium is promoted.

〔Effect of the invention〕

According to the present invention, the following effects are achieved.

1. Char can be easily burned.

2. The equipment is simpler and cheaper than the two-stage combustion system, and it is also easier to operate and maintain.

3. Foreign matter in the fluidized medium in the furnace, such as metal pieces,
Gravel and the like are automatically deposited in the deepest part of the fluid medium, so they can be effectively removed.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional structural view of a fluidized bed furnace showing an embodiment of the present invention in which the entire fluidized medium holding bottom is sloped, and FIG. FIG. 3 is a partial vertical cross-sectional view of the bottom of the fluid medium when the char, etc. input hole attachment portion is inclined, taken along the line X--X in FIG. 1. DESCRIPTION OF SYMBOLS 1...Fluidized bed furnace, 2...Fluidized medium, 3...Gasification fluid, 4...Gasification raw material inlet, 5...Produced gas outlet/inlet, 6...Dry aggregation Container, 7...Produced gas, 8
...Char, etc., 9...Char, etc. input hole, 10...
Baffle, 11...Gasified fluid ejection part, 12...Foreign matter removal hole, 13...Foreign matter removal hole

Claims (1)

[Claims] 1. In a fluidized bed furnace that pyrolyzes and gasifies organic carbon raw materials by a partial combustion method, in order to generate a desired regular circulation flow in part or all of the fluidized medium, the structure of the fluidized medium holding part of the fluidized bed furnace is Provide slopes on part or all of the object and/or
Alternatively, a gasification fluidized bed furnace characterized in that a baffle is provided in the fluidized medium of the fluidized bed furnace, and the fluidized medium is provided with an input section for organic carbon raw material and an input section for char on the upstream side thereof.