JPH01203814A - Fluidized bed combustion device - Google Patents

Abstract

PURPOSE:To activate the flow of a fluid substance and to facilitate movement of a stitch, by a method wherein a title device is provided with a slope blow nozzle to inject air along an slope bottom, a lateral discharge nozzle to inject air laterally from a side wall, and an inclination wall situated between the slope bottom and a vertical wall, and an air discharge nozzle on the furnace wall side is made different from that on the discharge groove side. CONSTITUTION:If the size of an air discharge nozzle 2 on the discharge groove side is in creased to a value higher than that of a nozzle on the furnace wall side, or the nozzle size is the same as each other, the nozzles are spaced closely to each other and a rising flow on the discharge groove side is increased. This method causes a paper making foreign matter fed in a furnace to produce a circulating flow 6 optimum to both a fluid medium 5 and combustion is formed, the paper making foreign matter is ignited for combustion. Through the action of an inclination wall 10 situated between a slope bottom 1 and a vertical wall 21, a smooth circulating flow is produced, and by means of air injected through a slope blow nozzle 11, fluidization in the vicinity of the inclination wall 10 is activated. A stitch residing in the vicinity of the inclination wall 10 is moved toward the lowermost part of the slope bottom 1. Since air injected through a lateral discharge nozzle 12 is raised in a discharge groove 9 and the flow of a fluid medium 5 is activated, the stitch is easily extracted through the discharge groove 9.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluidized bed combustion device for burning waste mixed with foreign matter, and in particular, it is possible to easily extract foreign matter from the bottom of the furnace together with a fluidized medium. The present invention relates to a fluidized bed combustion apparatus.

[Conventional technology]

Figure 2 is an overall explanatory diagram of a conventional fluidized bed combustion equipment that burns paper lees, which is waste mixed with foreign matter generated during the recycling process of waste paper, and Figure 3 shows the bottom of the furnace of the fluidized bed combustion equipment. It is a detailed explanatory diagram. This device includes a furnace 14 having an inclined bottom surface 1 and a vertical wall 21 continuous thereto, a fluidized medium 5 filled in the furnace 14, and an air blowing nozzle 2 provided on the inclined bottom surface 1 of the furnace 14. , and a discharge groove 9 provided at the lowest part of the inclined bottom surface 1. vertical wall 2
1 is provided with inlets for the fluid medium 5, sludge 16, and paper waste 17, respectively.

In addition, 18 is an evaporation water pipe provided in the flue 15, 13 is a temperature needle arranged on the furnace wall surface, and 1'9 is a castable.

In such a configuration, the paper lees 17 introduced into the furnace 14 form a circulating flow suitable for combustion together with the fluidized medium, and are ignited by a burner (not shown) and combusted.

At this time, the non-flammable foreign matter thrown into the furnace together with the paper dregs 17 moves to the lowest part on the inclined bottom surface 1 and is extracted out of the furnace through the discharge groove 9.

[Problem to be solved by the invention]

However, in the above-mentioned conventional hearth bottom structure, foreign matter
For example, when foreign objects do not get entangled with each other, such as unburnable solids (sludge) in coal or empty cans, they easily move with the flow of the fluid medium and are discharged from the discharge groove. For example, if foreign substances that have the characteristic of intertwining with each other, such as the fasteners of a cardboard box shown in Figure 3, which are called stitches, are mixed in, the degree of intertwining will grow and cause poor flow in the furnace. There is a problem in that it stagnates in places such as near walls and in discharge grooves and accumulates over time.

Figures 5 and 6 are explanatory diagrams showing the initial accumulation of stitches that occurred in the flow failure area 7 on the furnace wall surface, and Figures 7 and 8 show the growth of entanglements from Figures 5 and 6. FIG. 3 is an explanatory diagram showing a stitch accumulation situation. Figures 5 and 6 show stitches 20 that have piled up on the inclined bottom surface 1 and have stopped moving, and Figures 7 and 8 show stitches 20 that have grown entangled over time. However, the state in which the particles are deposited vertically on both sides of the discharge groove 9 and no longer flows down is shown. If the stitches accumulate in the furnace in this way, they will not flow, and in order to completely remove the stitches, the operation of the combustion device must be stopped, which is disadvantageous in that continuous operation cannot be performed.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a fluidized bed combustion device that activates the flow in the vicinity of the furnace wall surface and in the furnace bottom discharge groove where poor flow tends to occur, and in which the stitches can be easily moved. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides a furnace having an inclined bottom surface and a vertical wall continuous thereto, a fluidized medium filled in the furnace, an air blowing nozzle provided on the inclined bottom surface of the furnace, and a fluidized medium filled in the furnace. In a fluidized bed combustion apparatus having an exhaust groove provided at the lowest part of an inclined bottom surface, an inclined surface blow nozzle blows out air along the inclined bottom surface, and air is jetted laterally from opposing side walls of the exhaust groove. and an inclined wall provided between the inclined bottom surface and the vertical wall, and the air blowing nozzle is a different nozzle on the furnace wall side and the exhaust groove side. It is something.

[Effect]

By providing an inclined wall between the inclined bottom surface and the vertical wall, the sixth
Since the flow defective part 7 on the furnace wall surface shown in the figure disappears, the foreign matter slides down the sloped wall soil, and since the sloped blow nozzle is provided along the sloped bottom surface, the air blown out from the sloped blow nozzle will cause the foreign matter to slide down the sloped wall soil. Stitches stagnant on the nearby sloped bottom surface are blown away toward the bottom of the sloped bottom surface and moved to the vicinity of the discharge groove. Furthermore, by providing the side blow nozzles on the opposite side walls of the discharge groove, the air ejected from the side blow nozzles flows upward through the discharge groove, so that the discharge groove flow defective portion 8 shown in FIG. 8 is eliminated. In addition, by allowing more air to come out from the exhaust groove side of the air blowing nozzle than from the furnace wall side, the circulating flow within the furnace is aided, and the air moves to the entrance of the exhaust groove along with the circulating flow. The stitches that have been formed are easily extracted out of the furnace along with the fluid medium that is extracted from the discharge groove.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

FIG. 1 is an explanatory diagram of the main parts of a fluidized bed combustion apparatus showing one embodiment of the present invention.

This device is provided with an inclined wall 10 between the inclined bottom surface 1 and the vertical wall 21 shown in FIG. A horizontal blow nozzle 1 is installed on the opposite side wall of the discharge groove 9.
2.

In such a configuration, paper waste 1 supplied into the furnace
7, by making the nozzle hole of the air blowing nozzle 2 larger on the discharge groove side than on the furnace wall side, or if the nozzle holes are the same, by arranging the nozzles densely and increasing the upward flow on the discharge groove side, the fluidized medium is Together with 5, the circulating flow 6 becomes optimal for combustion, and is ignited by an ignition burner (not shown) to cause combustion.

At this time, due to the action of the inclined wall 10 provided between the inclined bottom surface 1 and the vertical wall 21, a smooth circulating flow is formed. Furthermore, the air ejected from the inclined surface blow nozzle 11 activates the fluidization near the inclined wall 10, so that
The stitches 20 stagnant near the inclined wall 10 move toward the bottom of the inclined bottom surface 1. Further, the air ejected from the side blow nozzle 12 provided on the side wall of the discharge groove 9 rises in the discharge groove 9, thereby causing the fluidized medium 5 in the discharge groove portion to
According to this embodiment, the stitches 20 that have moved to the discharge groove are easily pulled out through the discharge groove 9. According to this embodiment, the furnace wall surface flow defective portion 7 and the discharge groove flow defective portion 8 are removed. Therefore, the foreign matter introduced into the furnace 14 along with the fuel can be completely extracted without stopping the operation of the combustion apparatus.

〔Effect of the invention〕

According to the present invention, it is possible to easily and completely extract metal foreign objects that have the characteristic of intertwining with each other like stitches together with the fluid medium, so there is no need to stop for stitch extraction, and the fluidized bed combustion apparatus can be Can be operated continuously for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main parts of a fluidized bed combustion apparatus showing an embodiment of the present invention, FIG. 2 is an overall explanatory diagram of a conventional fluidized bed combustion apparatus, and FIG. 3 is the main part of FIG. 2. Explanatory diagram, Figure 4 is a diagram showing stitches, which are foreign metal objects contained in waste, Figures 5 to 8
The figure is a diagram showing a stitch accumulation situation that occurs in a conventional hearth structure. 1... Inclined bottom surface, 2... Air blowing nozzle, 6...
・Circulating flow, 9... Discharge groove, 10... Inclined wall, 11.
... Inclined wall blow nozzle, 12... Side blow nozzle. Agent Patent Attorney Takeshi Kawakita Cho 1: Inclined bottom 3: Fluidized air 6: Circulating flow 9: Discharge groove lO: Inclined wall 11: Inclined blow nozzle Figure 1

Claims (1)

[Claims] (1) A furnace having an inclined bottom surface and a vertical wall continuous thereto, a fluidized medium filled in the furnace, an air blowing nozzle provided on the inclined bottom surface of the furnace, and an air blowing nozzle provided at the lowest part of the inclined bottom surface. In a fluidized bed combustion apparatus having a discharge groove,
an inclined blow nozzle that blows out air along the inclined bottom surface; a side blow nozzle that blows out air laterally from opposing side walls of the discharge groove; and an inclined surface provided between the inclined bottom surface and the vertical wall. 1. A fluidized bed combustion apparatus, characterized in that the air blowing nozzle is a different nozzle on the furnace wall side and on the exhaust groove side.