JPS6215604Y2 - - 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.

When converter furnace 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, abrading it and degrading the surface. , and the slag adhesion to the bottom evaporation tube hinders the discharge of the slag, which has the drawback of hindering heat exchange in the boiler.

The present invention aims to avoid the above-mentioned drawbacks by attaching a corrugated sheet to the front surface of the bottom evaporator tube as a protector, but special ingenuity is required for the placement of the corrugated sheet in an environment where it is directly affected by high temperatures and where granular matter directly impacts it.

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

That is, the present invention provides a high-temperature granular heat recovery boiler in which a protector is provided on the surface of a sloping furnace bottom onto which high-temperature granular materials fall. Bolts having a length shorter than the tops of the crests of the plates, and corrugated plates that are drilled in the troughs of both side edges of the corrugated plates corresponding to the bolts and having a diameter larger than the diameter of the bolts, and that are adjacent to each other. Bolt holes are overlapped and aligned and loosely fitted into the bolts, and the bolt holes have a width that reaches the tops of the ridges on both sides adjacent to the valleys in which the bolt holes are drilled, and the nuts are inserted from above the corrugated plates into the corrugated plates. A high-temperature granular material heat recovery boiler is characterized in that it comprises a presser fastened to a bolt and a cover that covers the entire valley in which the bolt hole is formed.

According to the present invention, a plurality of corrugated plates are arranged on the surface of the sloping hearth bottom so as to overlap each other at the edge, and the corrugated plates are held by a pressing support installed in the hearth bottom. The protector is easy to install and remove, prevents thermal deformation of the protector in a high-temperature atmosphere, does not restrict the difference in elongation with the evaporation tube, and has a simple structure. Nevertheless, it works effectively.

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. 1st
In the figure, high-temperature molten converter slag is pulverized by high-speed air flow and granulated into fine particles.
The bottom of the boiler 1 that recovers the heat is inclined, and the furnace bottom 4 is composed of a membrane wall evaporation tube.

2 is a protector provided above the furnace bottom 4 with a gap 10 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 evaporation tube 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 reducing heat exchange efficiency. Therefore, as shown in Fig. 1 b and c, a protector 2 for protecting the bottom evaporation tube is provided on the entire bottom of the boiler or in a specific area, and as shown in Fig. 2 b and Fig. 3, the bottom evaporation tube 4' is protected. In order to make the entire heat transfer area effective, a gap 10 is provided between the protector 2 and the furnace bottom 4 so that the slag 3 can flow, so that the heat of the slag 3 flowing from the periphery can be recovered.

The protector 2 is preferably made of stainless steel to prevent the slag 3 from slipping and falling, but it may also be made of carbon steel, alloy steel, etc., and has rectangular waves as shown in FIGS. 2b and 3. Take the shape of plate 6. As shown in FIG. 3, bolt holes 6' are provided along both sides of the corrugated plate 6, and the diameter of the bolt holes 6' is larger than the diameter of the bolts 7 welded to the hearth bottom 4. The corrugated plate 6 can be moved slightly in the front, rear, left and right directions.

As shown in FIGS. 2a, b and 3, the protector 2 is constructed by overlapping the left and right corrugated plates 6, passing the bolts 7 through the bolt holes 6', and straddling the tops of the corrugations of the corrugated plates 6, 6. Place the holding metal fitting 8 as shown in the figure, and tighten the nut 7' from above the bolt 7 passing through the bolt hole 8' of the holding metal fitting 8, so that the corrugated bottom of the corrugated plate 6 is in pressure contact with the evaporation pipe 4'. The cover 9 is attached to the holding fitting 8 by folding the end edge of the cover 9 or welding it to the corrugated plate 6, and covers the nut tightening hole 8'' provided in the holding fitting 8. .

As is clear from FIG. 1b, the left and right furnace bottoms 4 are inclined toward the lower passage 5, so in order to smooth the flow of the slag 3 falling onto the protector 2, the corrugated plate shown in FIG. 6 is installed so that its longitudinal direction matches the slope of the hearth bottom 4.

The present invention uses a corrugated plate 6 for the protector 2, so it has appropriate strength, and the protector 2 and evaporation tube 4' can be connected by simply placing the corrugated bottom of the corrugated plate 6 on the evaporation tube 4'. A gap 10 can be provided between them, and by stacking them on the furnace bottom 4, the required area can be easily covered without any gaps.

In addition, since a gap 10 is provided between the evaporation tube 4' of the furnace bottom 4 and the corrugated plate 6 constituting the protector 2, the slag 3 can also flow through this gap and exchange heat with the water in the evaporation tube. Boiler efficiency can be improved. Furthermore, the presence of this gap 10 allows for good air circulation, making it possible to prevent thermal deformation of the protector 2 and also prevent burnout thereof.

In the protector 2 of the present invention, bolts 7 welded to the hearth bottom 4 are inserted through bolt holes 6' of the corrugated plate 6 and tightened with nuts via the presser fittings 8, so that the protector 2 is easy to install and remove. easy and
Since the diameter of the bolt hole 6' of the corrugated sheet 6 is larger than the diameter of the bolt 7, the corrugated sheet 6 can be moved back and forth and left and right to the extent corresponding to the difference in expansion between the evaporation tube 4' and the protector 2 caused by the heat of the slag 3. is possible, and therefore,
The difference in expansion between the evaporator tube 4' at the bottom of the furnace 4 and the protector 2 is not constrained, and no excessive force is applied to the boiler.
There is no fear that the evaporation tube 4' or the protector 2 will be bent.

Furthermore, the tops of the bolts are lower than the tops of the corrugated plates, the holding fittings are tightened on the back side of the holding fittings, and a cover is attached to the surface, so the bolt nuts are not exposed and wear is prevented.

[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.
Fig. 2 is a cross-sectional plan view taken along line B. Fig. 2 shows the connected state of the protector in Fig. 1, a is a plan view, b is a front view, and Fig. 3 is an enlarged sectional view of section C in Fig. 2 b. be. 1...boiler, 2...protector, 3...slag, 4...furnace bottom, 4'...evaporation tube, 5...lower passage, 6...corrugated plate, 6'...bolt hole, 7... Bolt, 7'... Nut, 8... Holder, 8'...
Bolt hole, 8″……Nut tightening hole, 9……
Cover, 10...Gap.

Claims (1)

[Scope of utility model registration request] A high-temperature granular heat recovery boiler in which a protector is provided on the surface of an inclined furnace bottom onto which high-temperature granular materials fall, including a plurality of corrugated plates constituting the protector, and the tops of the crests of the corrugated plates planted in the hearth bottom. A bolt having a shorter length, and a bolt having a diameter larger than the diameter of the bolt, which is bored in each side edge valley of the corrugated plate corresponding to the bolt, and adjacent corrugated plates are overlapped and aligned. and a bolt hole that is loosely fitted into the bolt, and has a width that reaches the peaks of the peaks on both sides adjacent to the valley in which the bolt hole is formed, and is tightened to the bolt with a nut from above the corrugated plate. A high-temperature granular material heat recovery boiler comprising a holding metal fitting and a cover that covers the entire valley portion in which the bolt hole is bored.