JPH11201423A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a heat efficiency by suppressing useless heat dissipation toward outside in a combustion device where the fluidized-bed-type dry distillation oven of a solid fuel and the combustion oven of char being generated by dry distillation in parallel and communicating with each other. SOLUTION: A combustion device is constituted by arranging a dry distillation oven 1 for performing the dry distillation of a solid fuel A by a high- temperature bubbling flow layer and a char combustion oven for burning the char content of a dry distillation residue in parallel and performing connection by seal pots 6 and 6' where the splash particles of a fluid material bubbling are deposited and fluid material circulation ports 7 and 7' at one edge and the other edge of each oven. The closed loop of a fluid material 3 is formed through the dry distillation oven 1 and the char combustion oven, thus preventing heat being accumulated at the fluid material 3 from being dissipated outside, reducing heat loss, and improving heat efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus in which a fluidized bed type carbonization furnace for solid fuel and a combustion furnace for char generated by carbonization are arranged in parallel and communicate with each other.

[0002]

2. Description of the Related Art An outline of a conventional combustion apparatus of this type will be described with reference to FIG. The solid fuel A charged into the carbonization furnace 21 for carbonizing solid fuel such as waste or coal comes into contact with the high-temperature fluidized material 23 to be gasified, and heavy incombustibles are discharged to the outside through the noncombustible residue discharge port 25, and light. The char portion moves to the char combustion furnace 22 through the communication passage 29 together with the fluid material 23 and burns.

[0003] The fluidized material 23 having a higher temperature in the char combustion furnace 22 becomes a fluidized material circulating flow 30 by a fluidized material carrier gas 28, is conveyed by air through a path 26, and the fluidized material separated by the cyclone 27 is again recycled. It returns to the carbonization furnace 21 and serves as a heat medium for the carbonization furnace 21.

[0004]

In the conventional apparatus having the above-described structure, a large heat loss occurs in the fluidized material transporting path outside the fluidized bed furnace due to air transport or the like, which causes a reduction in thermal efficiency.

[0005] It is an object of the present invention to solve such a problem in the conventional apparatus, to suppress unnecessary heat release to the outside, and to provide a further improved thermal efficiency.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises: a carbonization furnace for carbonizing solid fuel such as waste and coal in a high-temperature bubbling fluidized bed; At the one end and the other end position of each furnace, a seal pot on which splash particles of fluidized material bubbling provided in the upstream furnace are deposited and a fluid material provided in the downstream furnace An object of the present invention is to provide a combustion device in which a circulation port is communicated and a circulating flow of a fluid material is formed from an upstream furnace to a downstream furnace through the communication portion.

That is, according to the present invention, the flow material at the downstream end of the carbonization furnace hits upstream from the upstream end of the char combustion furnaces arranged in parallel. Splash particles of fluidized material bubbling that passed through the mouth and accumulated in the seal pot on the carbonization furnace side,
The transition from the carbonization furnace to the char combustion furnace is performed through this communication part.

[0008] At the downstream end of the char combustion furnace, the fluidized material hits upstream from the upstream ends of the carbonization furnaces arranged in parallel. Splash particles of the fluidized material bubbling accumulated in the side seal pot are transferred from the char combustion furnace to the carbonization furnace through this communication part.

Thus, a closed loop of the fluidized material is formed through the carbonization furnace and the char combustion furnace, and the fluidized material is not dissipated to the outside. Therefore, the heat accumulated in the fluidized material is not dissipated to the outside, and the thermal efficiency is improved. Can be done.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a plan view, FIG. 4 is a perspective view, and FIG. 5 is a diagram that facilitates understanding of circulation of fluidized material. FIG. 5 is an explanatory diagram in which a virtual portion (an aspect of three-dimensionally connecting to the right half surface of the drawing) is added to the left end by a broken line to the extent possible.

1 is a carbonization furnace, 2 is a char combustion furnace, and a fluidized material 3
Are arranged in parallel in the longitudinal direction in which
The interior of 2 is defined below by a diffuser plate 8 of the hearth below to form a wind box 9, and a fluidized bed of the fluidized material 3 is formed above the diffuser plate 8.

In the dry distillation furnace 1, solid fuel A such as waste or coal is placed at the upper end on the upstream side of the fluidized material 3 flowing inside the dry distillation furnace 1.
A fuel inlet 4 for charging the fluid is provided, and a solid fuel A is provided at a position opposite to the fuel inlet 4 at a lower end on the downstream side of the fluidized material 3.
A non-combustible residue discharge port 5 for discharging the non-combustible material D therein is provided.

At the upstream end of the dry distillation furnace 1, a fluidized material circulating port 7 is opened at a position below the fuel inlet 4, and at a downstream end, at a position above the non-combustible residue discharge port 5. Is provided with a seal pot 6.

A vent for supplying high-temperature exhaust gas or carbonized gas B for heating the fluidized material 3 and a vent for supplying air E as a combustion agent for each furnace are provided below the wind box 9. ing.

A char combustion furnace 2 is arranged in parallel with the carbonization furnace 1 on the back side of the carbonization furnace 1 having such a configuration. A fluidized material circulation port 7 ′ is provided and communicates with the seal pot 6 of the carbonization furnace 1.

A seal pot 6 ′ is provided downstream of the fluidized material 3 in the char combustion furnace 2, and communicates with a fluidized material circulation port 7 of the dry distillation furnace 1.

That is, when the carbonization furnace 1 is used as a reference,
The fluidizing material circulation port 7 located upstream of the fluidizing material 3 in the carbonization furnace 1
Is located downstream of the seal pot 6 ′ downstream of the fluidized material 3 in the char combustion furnace 2, and the seal pot 6 located downstream of the fluidized material 3 in the dry distillation furnace 1 is a fluidized material in the char combustion furnace 2. 3 and upstream of the fluidized material circulation port 7 ′.

Therefore, looking at the movement of the fluidized material 3 through the carbonization furnace 1 and the char combustion furnace 2, the fluidized material 3 flowing out from the upstream side of the carbonization furnace 1 is transferred from the seal pot 6 of the carbonization furnace 1 to the char combustion furnace 2. A closed circulation loop is formed to reach the fluidized material circulation port 7 ′ and further from the seal pot 6 ′ of the char combustion furnace 2 to the fluidized material circulation port 7 of the dry distillation furnace 1.

In the char combustion furnace 2, F indicates a combustion exhaust gas, and 10 indicates a splash scattered from the fluidized material 3.

In the present embodiment constructed as described above, solid fuel A such as waste or coal is charged into the carbonization furnace 1 from the fuel inlet 4 and supplied from the diffuser plate 8 on the hearth. The solid fuel A is gasified by contact and mixing with the fluidized material 3 fluidized by the high-temperature exhaust gas or the carbonization gas itself.

The heavy non-combustible portion D as the carbonization residue is discharged from the non-combustible residue discharge port 5, and the light char portion moves to the char combustion furnace 2 together with the fluidizing material 3, and is burned by the air E which is also used as a fluidizing gas. .

Most of the heat generated by the combustion is taken out as flue gas F, but a part of the heat flows on a fluidized material circulating flow 11 (shown by a white arrow in the figure) to be described later.
It is brought inside and used as a heat source necessary for carbonization.

As a heat source required for carbonization, in addition to this heat amount, there is also a heat amount brought in by a high-temperature exhaust gas or the carbonization gas itself, but here, the former is mainly supplied.

The transfer mode of the fluidized material 3 between the dry distillation furnace 1 and the char combustion furnace 2 is performed as follows. As described above, the carbonization furnace 1 and the char combustion furnace 2 are arranged side by side in parallel, and seal pots 6 and 6 'are provided on both ends of a partition plate 12 for partitioning the both.

At positions corresponding to the bottoms of the seal pots 6, 6 ', fluid material circulation ports 7', 7 through which the fluid material 3 passes are provided.

The fluid material 3 and the char particles diffused by the bubbling flow are deposited on the seal pots 6 and 6 ', and the deposited fluid material 3 adjoins via the fluid material circulation ports 7' and 7 by the powder pressure. Extruded into the other furnace.

At this time, the fluid material 3 inside the seal pots 6, 6 'is not fluidized, and the flow of the fluid material 3 is always downward. This action is performed in each seal pot 6, 6 ',
A spontaneous fluidized material circulation flow 11 is generated between the carbonization furnace 1 and the char combustion furnace 2.

The fluid material circulating flow 11 can be controlled by adjusting the opening area of each of the seal pots 6 and 6 'and the area of each of the fluid material circulating ports 7' and 7. Further, due to the presence of the moving fluidized bed in the seal pots 6 and 6 ', the dry distillation furnace 1 is provided.
The gas sealing property is maintained between the gas and the char combustion furnace 2, and contact between the carbonized gas and air is avoided.

As described above, according to the present embodiment, the carbonization furnace 1
The circulation and transport of the fluidized material 3 between the furnace and the char combustion furnace 2 are performed directly without providing a special transporting device and mechanism. The large amount of heat generated in 2 can be used effectively.

Since the temperature of the high-temperature gas for fluidizing the carbonization furnace 1 can be reduced, it is not necessary to provide heat from an external heat source or a part of the carbonization gas required for increasing the temperature of the gas. Thus, the thermal efficiency of the entire system can be improved.

Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to such an embodiment.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0032]

As described above, according to the present invention, a carbonization furnace for carbonizing solid fuel such as waste and coal in a high-temperature bubbling fluidized bed and a char combustion furnace for burning the char portion of the carbonization residue are arranged in parallel. Arrange, at one end and the other end position of each furnace, communicate a seal pot in which splash particles of fluidized material bubbling provided in the upstream furnace are deposited and a fluidized material circulation port provided in the downstream furnace, and this communication portion To form a circulating flow of fluidized material from the upstream furnace to the downstream furnace to form a combustion device, so that the fluidized material at the downstream end of the carbonization furnace is higher than the upstream end of the parallel-arranged char combustion furnace. Corresponding to the upstream, the splash particles of the fluidized material bubbling that passed from the seal pot on the dry distillation furnace side to the fluidized material circulation port of the char combustion furnace, and accumulated in the seal pot on the dry distillation furnace side, passed from the dry distillation furnace to the char combustion furnace through this communication part. It will be migrated.

At the downstream end of the char combustion furnace,
Since the fluidized material hits upstream from the upstream end of the parallel-arranged dry distillation furnace, the splash of the fluidized material bubbling that flows from the seal pot on the char combustion furnace side to the fluidized material circulation port of the carbonization furnace and accumulates in the seal pot on the char combustion furnace side Particles will transfer from the char combustion furnace to the carbonization furnace through this communication.

Thus, a closed loop of the fluidized material is formed through the carbonization furnace and the char combustion furnace. Since the fluidized material is not dissipated outside, the heat accumulated in the fluidized material is not dissipated to the outside. It was possible to improve the thermal efficiency.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of a combustion device according to an embodiment of the present invention.

FIG. 2 is a side view showing an outline of the combustor of FIG.

FIG. 3 is a plan view showing an outline of the combustor of FIG. 1;

FIG. 4 is a perspective view showing an outline of the combustor of FIG. 1;

FIG. 5 is an explanatory diagram schematically illustrating the outline of the combustor of FIG. 1 in a two-dimensional manner.

FIG. 6 is an explanatory view showing an outline of a conventional combustor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 carbonization furnace 2 char combustion furnace 3 fluidizing material 4 fuel input port 5 non-combustible residue discharge port 6, 6 ′ seal pot 7, 7 ′ fluidizing material circulating port 8 diffuser plate 9 wind box 10 splash 11 fluidizing material circulating flow 12 partition plate Reference Signs List A solid fuel B high-temperature exhaust gas or dry-distilled gas C dry-distilled gas D non-combustible material E air F combustion exhaust gas 21 dry-distillation furnace 22 char combustion furnace 23 fluid material 25 non-combustible residue discharge port 27 cyclone 28 fluid material carrier gas 29 communication passage 30 fluid material circulating flow

Claims (1)

[Claims] 1. A carbonization furnace for carbonizing solid fuel such as waste or coal in a high-temperature bubbling fluidized bed and a char combustion furnace for burning the char portion of the carbonization residue are arranged in parallel. In the above, the seal pot in which the splash particles of the fluidized material bubbling provided in the upstream furnace are deposited and the fluidized material circulation port provided in the downstream furnace communicate with each other, and from the upstream furnace to the downstream furnace through this communicating portion. A combustion device characterized by forming a circulating flow of fluidized material.