JPH10281432A - Gas straightening structure of secondary combustion chamber for incinerating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably ensure a mixing agitating efficiency by disposing a plurality of liquid supply tubes in parallel or lattice state in a secondary combustion chamber, and diffusing combustion air to unburnt gas rising from a combustion air diffusing hole at a downstream of the supply tube. SOLUTION: A plurality of fluid supply tubes 2 are horizontally disposed at an interval in parallel across a secondary combustion chamber 1 to form parallel gas channels 3. Gas generated in a fluidized bed (primary combustion chamber) is exhausted from a top of a furnace via the channels 3 of the tubes 2. Unburnt gas of the rising gas is burnt while bearing mixed with combustion air diffused down from combustion air holes 4 of a liquid supply tube 2, combustion gas is uniformly distributed via the channels 3 of the tubes 2 disposed in parallel, and exhausted from the top without drift. Thus, mixing agitating efficiency of the unburnt gas can be stably held, and hence combustibility is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas rectification structure for a secondary combustion chamber of an incinerator for incinerating municipal waste and industrial waste.

[0002]

2. Description of the Related Art A fluidized bed incinerator is an example of an incinerator used for incineration of waste. The fluidized bed incinerator forms a fluidized bed (primary combustion chamber) of hot sand on the hearth, disperses the refuse charged in the incinerator in the fluidized bed, and supplies it from below the fluidized bed with a first blower. The combustion air is used for combustion.

The gas generated in the fluidized bed is discharged from the furnace top to the outside of the furnace, while the unburned gas is supplied to the free board (secondary combustion chamber) above the double incinerator by the combustion air supplied by the second blower. After the secondary combustion, the fuel is discharged outside the furnace.

[0004] However, since the flow velocity of the gas in the secondary combustion chamber is extremely low, even if the convection time is long, the unburned gas and the combustion air are not sufficiently mixed, and the unburned gas is completely removed.
There was a problem that it would not burn next.

Japanese Patent Laid-Open Publication No. 1-225802 discloses a fluidized bed incinerator in which a baffle plate is provided in a secondary combustion chamber in order to increase the stirring and mixing efficiency of unburned gas and combustion air.

FIG. 3 is a cross-sectional view of a conventional fluidized bed incinerator having a baffle plate in a secondary combustion chamber, in which a baffle plate 7 is provided in a secondary combustion chamber 1 of a fluidized bed incinerator. 1 The unburned gas generated by the combustion of combustible waste in the fluidized bed 9 fluidized by the combustion air supplied by the blower 8 is reunited after the gas flow is divided by the baffle plate 7 The mixture is vigorously mixed and agitated with the combustion air supplied by the second blower 10 into the secondary combustion chamber, completely secondary-combusted, and discharged out of the furnace.

[0007]

In the fluidized bed incinerator provided with the baffle plate, since the gas flow is largely branched to both sides of the baffle plate, the gas drift after passing through the baffle plate is large and uniform. It is difficult to obtain combustion.

[0008] The present invention provides a gas rectification structure of a secondary combustion chamber of an incinerator provided with a rectification structure capable of preventing gas drift in the secondary combustion chamber and stably ensuring mixing and stirring efficiency. .

[0009]

The gas rectifying structure of the secondary combustion chamber of the incinerator according to the present invention comprises a plurality of fluid supply pipes which are horizontally parallel to the secondary combustion chamber of the incinerator or in a grid. The fluid supply pipe is provided with a plurality of combustion air blowing holes for blowing combustion air downward at regular intervals.

[0010]

FIG. 1 shows a first embodiment of a gas rectifying structure according to the present invention, and FIG. 1 (a) is a partially cutaway perspective view showing a state in which fluid supply pipes are arranged in parallel. Figure 1
(B) is a longitudinal sectional view.

A plurality of fluid supply pipes 2 are horizontally arranged across the secondary combustion chamber 1 at parallel intervals to form a parallel gas flow path 3. On the lower side of the fluid supply pipe 2, combustion air blow holes 4 for blowing combustion air in the pipe axis direction are provided at regular intervals. Since the fluid supply pipe 2 is required to have heat resistance, a heat resistant material such as ceramics is used.

In the above structure, the gas generated and rising in the fluidized bed (primary combustion chamber) is discharged from the furnace top through the gas passage 3 of the fluid supply pipe 2. The unburned gas burns while being mixed with the combustion air blown downward from the combustion air outlet 4 of the fluid supply pipe 2, and the combustion gas drifts through the gas passage 3 of the fluid supply pipe 2 arranged in parallel. Rises without being discharged from the furnace top. Therefore, the rising gas is uniformly diverted by the fluid supply pipes 2 arranged in parallel and rises without drifting, so that the mixing and stirring efficiency of the unburned gas can be stably maintained.

Further, since the combustion air blown downward from the combustion air outlet 4 cools the fluid supply pipe, it is possible to prevent the clinker and dust from adhering to the fluid supply pipe itself.

FIG. 2 shows a second embodiment of the gas rectification structure of the present invention, and FIG. 2A is a perspective view of a partially cut-away section showing a state in which fluid supply pipes are arranged in a grid. -(B) is a longitudinal sectional view.

As in the first embodiment, a plurality of fluid supply pipes 2 are arranged horizontally in parallel in the secondary combustion chamber at intervals, and combustion air is provided below the fluid supply pipes 2 in the pipe axial direction. Are provided at regular intervals.

Further, the fluid supply pipes 2 arranged in parallel with each other
A plurality of fluid supply pipes 5 are arranged in parallel at a right angle to the upper side of the fluid supply pipe 5, and the upper fluid supply pipe 5 and the lower fluid supply pipe 2
Thus, a lattice-shaped gas flow path 6 is formed. Each fluid supply pipe 2,
5, combustion air blowout holes 4 for blowing out combustion air in the tube axis direction are provided at regular intervals.

In the above configuration, the gas generated and rising in the fluidized bed (primary combustion chamber) is discharged from the furnace top through the gas passages 6 of the fluid supply pipes 2 and 5 arranged in a grid. However, of the rising gas, the unburned gas burns while being mixed with the combustion air blown downward from the combustion air blowing holes 4 of the fluid supply pipes 2 and 5 arranged in a grid, and the combustion gas is formed in a grid. It rises without drifting through the gas flow path 6 of the disposed fluid supply pipes 2 and 5, and is discharged from the furnace top. Accordingly, the rising gas is uniformly diverted by the fluid supply pipes 2 and 5 arranged in a grid and rises without being drifted, so that the mixing and stirring efficiency of the unburned gas can be stably maintained.

Further, as in the first embodiment, the cooling effect of the combustion air blown out from the combustion air blow-out hole 4 can prevent the clinker and dust from adhering to the fluid supply pipe itself. In the present embodiment, a fluidized bed incinerator has been described as an example of an incinerator, but the present invention is not limited thereto, and a primary combustion chamber is provided at a lower portion, and a secondary combustion chamber is provided at an upper portion thereof. The incinerator can be applied to any incinerator, and is widely applied to stoker furnaces, rotary kiln furnaces, etc., and has the same effect.

[0019]

According to the present invention, a plurality of fluid supply pipes are arranged in parallel or in a grid in the secondary combustion chamber, and the combustion air is blown out to the unburned gas rising from the combustion air outlet below the fluid supply pipes. The mixing and agitation is promoted, and the rising gas is uniformly diverted by the plurality of fluid supply pipes and rises without drifting, so that the combustibility is improved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a gas rectification structure of the present invention, and FIG. 1- (a) is a partially cutaway perspective view showing a state where fluid supply pipes are arranged in parallel, and FIG. ) Is a longitudinal sectional view.

FIG. 2 shows a second embodiment of the gas rectification structure of the present invention, and FIG. 2- (a) is a partially cutaway perspective view showing a state where fluid supply pipes are arranged in a grid, and FIG. b) is a longitudinal sectional view.

FIG. 3 is a cross-sectional view of a conventional fluidized bed incinerator provided with a baffle plate in a combustion chamber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary combustion chamber 2 Fluid supply pipe 3 Gas flow path 4 Air supply hole for combustion 5 Upper fluid supply pipe 6 Gas flow path 7 Baffle plate 8 First blower 9 Fluidized bed (primary combustion chamber) 10 Second blower

Claims (2)

[Claims] 1. A primary combustion chamber for burning combustibles in a lower part.
In an incinerator having a secondary combustion chamber for burning unburned gas generated in the primary combustion chamber at an upper part, a plurality of fluid supply pipes are arranged in parallel across the secondary combustion chamber horizontally,
A gas rectifying structure for a secondary combustion chamber of an incinerator, wherein a plurality of combustion air outlets for blowing out combustion air are provided at predetermined intervals in a fluid supply pipe below. 2. A primary combustion chamber for burning combustibles in a lower portion,
In an incinerator provided with a secondary combustion chamber for burning unburned gas generated in the primary combustion chamber at an upper portion, a plurality of fluid supply pipes are arranged in a grid pattern horizontally across the secondary combustion chamber, A fluid rectifying structure for a combustion chamber of a fluidized bed incinerator, wherein a plurality of combustion air blow-off holes for blowing combustion air are provided below the fluid supply pipe at regular intervals.