JPS6215602Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-temperature granular heat recovery boiler in which a protector is held on the surface of an inclined furnace bottom.

A heat recovery boiler for pulverized slag is known, for example, from Japanese Patent Laid-Open No. 55-65801, which is an earlier application of the present applicant.

As described in this publication, when converter slag in the form of particles or droplets at a high temperature of 800° to 1600°C is used in a heat recovery boiler, these slags collide with the surface of the bottom evaporation tube and wear it out. It has the drawback of deteriorating the surface and obstructing the discharge of slag due to its adhesion to the bottom evaporator tube, which impedes heat exchange in the boiler.

The purpose of this invention is to avoid the above-mentioned drawbacks by attaching a plate to the front of the bottom evaporation tube as a protector. Special consideration is required for the placement of the plates in a collision environment.

The present invention aims to provide an optimal configuration for this purpose.

That is, in the present invention, a plurality of protectors each having a folded part formed on one side of rectangular plate material are provided on the surface of the inclined hearth bottom on which high-temperature granular materials fall, and the folded parts are directed in the direction of the inclination of the hearth bottom, and the edges are The protectors are mounted on top of each other and are arranged with a gap left between them and the fins of the evaporation tube at the bottom of the furnace, and one or more protectors are arranged in the inclined direction, and the protector is arranged at the uppermost end in the inclined direction or A high-temperature granular material characterized in that one of its lowermost ends is fixedly held by a support member fixed to the hearth bottom, and the other end is movably held by a sliding support member fixed to the hearth bottom. Located in the heat recovery boiler.

According to the present invention, by forming the folded part, the flow of the granules is given directionality and is made easier to flow. In addition, the stiffness is increased by the folded part,
Even if a temperature difference occurs between the upper surface and the lower surface of the protector, thermal deformation is prevented from occurring. Furthermore, the particulate matter flows into the gap between the fins of the evaporation tube and the protector, thereby improving the efficiency of heat recovery from the particulate matter. Moreover, since one end of the protector is slidably attached, the difference in thermal expansion between the protector and the evaporation tube is not constrained. Furthermore, the protector can be easily and easily attached and detached, and it works effectively despite its simple structure.

Because of these features, the present invention can be widely applied to converter slag crushing boilers, other devices for recovering high-temperature granular media, and boilers for recovering heat.

Embodiments of the present invention will be described with reference to the drawings.

In Figure 1, the bottom of a boiler 1 that receives slag 3, which is made up of high-temperature molten converter slag into fine particles by air crushing it with a high-speed air flow, and recovers the heat, is inclined and has a membrane wall. The furnace bottom 4 is composed of the evaporation tube 4'.

2 is a protector provided above the furnace bottom 4 with a gap 11 as shown in FIG. 2b, and the high temperature slag 3 is directed toward the furnace bottom 4 as shown by arrow A in FIG. Once it falls, it flows on the surface of the furnace bottom 4 as shown by arrow B in FIG. In such a boiler, if high-temperature slag 3 falls directly onto the furnace bottom 4, the evaporator tube 4' may be worn out, or the slag 3 may adhere and accumulate on the surface of the furnace bottom 4, obstructing the flow of the slag 3 and causing heat generation. To avoid this, as shown in Fig. 1, a protector 2 is installed on the entire bottom of the boiler or in a specific area to protect the bottom evaporation tube 4', and the entire bottom evaporation tube 4' is used as an effective heat transfer area. Therefore, a gap 1 is created between the protector 2 and the furnace bottom 4 so that the slag 3 can flow.
1 is provided between the fins of the evaporation tube and the protector to recover heat from the slag 3 flowing in from the periphery.

The protector 2 is preferably made of stainless steel in order to prevent the slag 3 from sliding down, but it can also be made of carbon steel, alloy steel, etc., as shown in FIG. An angle-shaped folded portion 2' is provided on the side, and a small angle 6 is welded to one side of the short side.

Lugs 7 and 8 are fixed to the evaporation pipe 4' in the furnace bottom 4 by welding or the like, and the protector 2 is fixed as shown in Fig. 2b.
As shown in the figure, stack the sheets one by one with the folded parts 2' facing in the direction of inclination with respect to the furnace bottom 4.
They are fixed to each other with bolts and nuts 10 through a piece 9 between them, and the rear side is the slide side, and the protector 2 is inserted into the gap between the evaporation tube 4' of the furnace bottom 4 and the lug 8 so that it can slide. It's getting old.

When connecting the protectors 2 long in the longitudinal direction, as shown in FIG. The lug 7' protruding through the surface is fixed to the piece 9 with bolts and nuts 10, and the sliding side end of the front protector 2 is inserted between the rear protector 2, piece 9, and the lug 8'. By doing so, they are connected in the longitudinal direction.

The structure for fixing the fixed side of the protector 2 is not limited to the one described above, but as shown in other embodiments shown in FIGS. 4 and 5, a small angle 6 welded to the protector 2 and a lug welded to the hearth bottom 4 are used. 7 and directly with bolts and nuts 10, or protector 2
Bolt 10 planted in and lug 7 welded to hearth bottom 4
may be directly fixed with a nut. Furthermore, the structure of the slide side of the protector 2 is not limited to the one described above, and as shown in other embodiments shown in FIGS. 6 and 7, the lug 8 welded to the hearth bottom 4 is simply an L-shaped plate. may be attached perpendicularly to the hearth bottom 4, or the plate surface of the plate-shaped lug 8 having steps may be welded to the hearth bottom 4. When such a structure is adopted, processing and installation become easier and manufacturing can be done at low cost.

Since the present invention is configured as described above,
Since there are almost no protrusions on the surfaces of the furnace bottom 4 and the protector 2 that would provide resistance to the flow of the slag 3, the slag 3 with welding and caking properties is
However, it may accumulate on the protector 2, or
and the hearth bottom 4 from being blocked,
The slag 3 does not collide with the surface of the evaporation tube 4' of the furnace bottom 4 and wear it down, degrading the surface and making it easy for slag to adhere, so that the slag does not accumulate and impede heat exchange. Never happened. Furthermore, since a gap 11 is provided between the evaporator tube 4' of the furnace bottom 4 and the protector 2, the slag 3 can also flow through this gap and exchange heat with the water in the evaporator tube, improving the efficiency of the boiler. I can do it. Furthermore, the presence of this gap 11 allows for good air circulation, making it possible to prevent thermal deformation of the protector 2 and also prevent it from burning out.

Since the protector 2 of the present invention is designed to be slidable by inserting one end of the protector 2, the difference in elongation between the evaporation tube 4' of the furnace bottom 4 and the protector 2 is not restricted, and therefore, there is no stress on the boiler. Power doesn't work,
There is no fear that the evaporation tube 4' or the protector 2 will be bent.

The present invention has a folded part 2' on one side of the long side of the protector 2, so it has appropriate strength and can be placed over the hearth bottom 4, making it easy to cover the necessary area. Since the protector 2 can be covered without any gaps, and the protector 2 is fixed to the hearth bottom 4 using bolts, nuts, or clipping, the structure is not only simple, but also easy to install and remove. It is.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the high-temperature granular heat recovery boiler of the present invention, in which a is a vertical sectional side view and b is a side view of the same.
A longitudinal sectional front view taken along line A-A of , c is B- of the same a.
A cross-sectional plan view taken along line B, FIG. 2 shows the lateral connection state of the protector in FIG.
is a plan view, b is a front view, c is a side view, and FIG.
4 and 5, which are partially cutaway plan views taken along lines, show other embodiments of the fixed side of the protector.
a is a plan view, b is a front view, and 6th
Figures 7 and 7 show other embodiments of the slide side of the protector, in which a is a plan view and b is a front view. 1...boiler, 2...protector, 2'...turning part, 3...slag, 4...furnace bottom, 4'...evaporation tube, 5...lower passage, 6...small angle, 7...
...Lug, 8...Lug, 9...Piece, 10...Bolt, nut, 11...Gap, 12...Notch.

Claims (1)

[Scope of utility model registration request] On the surface of the sloping furnace bottom, where hot particles fall,
A plurality of protectors each having a folded part formed on one side of a rectangular plate are attached with the folded part facing the inclination direction of the furnace bottom and the edges overlapped with each other, and are installed between the protectors and the fins of the evaporation tube of the furnace bottom. The protector is arranged with a gap left, one or more protectors are arranged in the inclined direction, and one of the uppermost end or the lowermost end in the inclined direction is a support member fixed to the hearth bottom. 1. A high temperature granular material heat recovery boiler, characterized in that one part is fixedly held and the other part is movably held by a sliding support member fixed to the bottom of the furnace.