JPS6215603Y2 - - 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 stated in this publication, 800° to 1600°C
When high-temperature granular or droplet-shaped converter slag 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 causing adhesion to the bottom evaporation tube. Therefore, the discharge of slag is obstructed, which has the drawback of interfering with heat exchange in the boiler.

The purpose of this invention is to attach a flat plate as a protector to the front of the bottom evaporation tube to avoid the above-mentioned drawbacks. Special consideration will be required regarding the placement of the flat plates in the coming environment.

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 the inclined furnace bottom where high temperature granular materials fall, and in which the granular material is fixed to the back surface of a flat plate constituting the protector in parallel to the flow direction of the granular material. A first reinforcing rib is provided, lugs are attached to both ends of the first reinforcing rib in parallel with the flat plate at an interval, and
A second reinforcing rib is provided perpendicularly to the reinforcing rib and fixed to the back surface of the flat plate, a fixed lug fixed to the furnace bottom parallel to the flow direction of the granular material is provided, and the second reinforcing rib is fixed to the The protector is held on the furnace bottom by hooking reinforcing ribs, and the height of the first reinforcing ribs fixed parallel to the flow of the granules is higher than the height of the second reinforcing ribs. A high-temperature granular material heat recovery boiler is characterized in that the flow of granular material flowing through the bottom of the furnace is not obstructed.

The heat recovery boiler of the present invention has good heat exchange efficiency, and the protector is easy to install and remove, preventing thermal deformation of the protector in a high-temperature atmosphere and restraining the difference in expansion with the evaporation tube. Although the structure is simple, 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 bottom evaporation pipe 4' (second
It consists of a tilted furnace bottom 4 consisting of Figure b).

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 bottom 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 causing heat generation. To avoid this, as shown in Figure 1, a protector 2 is provided to protect the bottom evaporator tube 4' (Figure 2b) on the entire bottom of the boiler or in a specific area, and all bottom evaporator tubes 4' are in an effective state. In order to provide a heat transfer area, a gap 11 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 surrounding area can be recovered.

The protector 2 is preferably made of stainless steel to prevent the slag 3 from sliding down, but it may also be made of carbon steel, alloy steel, etc. as shown in FIGS. 2 and 3.
As shown in the figure, the long side of the back surface of the rectangular flat plate 6 is set as the slag flow direction 3, and the first reinforcing ribs 7 are provided on both sides of the long side, and the first reinforcing ribs 7 are arranged between the first reinforcing ribs 7 and 7 perpendicular to this. The second reinforcing ribs 8 are welded to each other, and lugs 9 are attached to the front and rear ends of each of the first reinforcing ribs 7, 7 at intervals from the flat plate 6. The lug 9 may be made by bending the lower end of the first reinforcing rib 7 at a right angle.

A fixing lug 10 is fixed to the bottom evaporation pipe 4' of the furnace bottom 4 by welding or the like, and the protector 2 has a lug 9 of the first reinforcing rib 7 attached to the furnace bottom as shown in FIG. 2b. so that it rests on the bottom evaporation tube 4' of No. 4,
In addition, by placing the fixing lug 10 and the second reinforcing rib 8 of the bottom evaporation tube 4' in contact with each other, the protector 2 can be fixed in the longitudinal direction, and the protector 2 can be fixed in the longitudinal direction, and the By stacking the first reinforcing ribs 7, 7 of the protectors 2, 2 with different heights, the protectors 2, 2 of different heights are sequentially and successively inserted into the furnace wall, and the protectors 2, 2 can be moved from side to side. is prevented from occurring.

Since the present invention is configured as described above,
Excellent effects such as those listed below can be achieved. That is, (a) the protector can be stably placed on the bottom evaporation tube by the lugs attached to both ends of the reinforcing rib with the higher height. Further, since the reinforcing ribs of the protector are held by simply hooking them onto the lugs of the evaporation tube, the difference in thermal expansion between the protector and the evaporation tube is not restricted. (b) The height of the reinforcing ribs that are parallel to the flow of the particulate matter is higher, and the lugs on the top surface of the evaporation tube are also parallel to the flow, so the flow of the particulate matter is not obstructed. (c) When multiple protectors are installed at the bottom of the hearth, by making the heights of the reinforcing ribs of adjacent protectors different, the edges can be overlapped with each other. Does not cause movement.
Further, by increasing the height of the reinforcing ribs and increasing the gap between the protector and the evaporation tube, air circulation is improved and thermal deformation of the protector can be 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.
A cross-sectional plan view along line B, Figure 2 shows the connected state of the protector in Figure 1, where a is a plan view, b is a front view, c is a side view, and Figure 3 is a reverse view of the protector in Figure 2. FIG. DESCRIPTION OF SYMBOLS 1... Boiler, 2... Protector, 3... Slag, 4... Furnace bottom, 4'... Bottom evaporation tube, 5... Lower passage, 6... Flat plate, 7... First reinforcing rib, 8
... Second reinforcing rib, 9 ... Lug, 10 ... Fixed lug, 11 ... Gap.

Claims (1)

[Scope of utility model registration request] In a high-temperature granular material heat recovery boiler in which a protector is disposed on the surface of an inclined furnace bottom onto which high-temperature granular material falls, a first reinforcing rib is fixed to the back surface of a flat plate constituting the protector in parallel to the flow direction of the granular material. , lugs are attached to both ends of the furnace in parallel with the flat plate at an interval, and a second reinforcing rib is provided perpendicularly to the first reinforcing rib and fixed to the back surface of the flat plate. A fixed lug fixed parallel to the flow direction of the granular material is provided, and the second reinforcing rib is hooked to the fixed lug to hold the protector on the inclined furnace bottom, and the protector is fixed parallel to the flow direction of the granular material. A high-temperature granular material heat recovery boiler, characterized in that the height of the first reinforcing rib is higher than the height of the second reinforcing rib so as not to impede the flow of the granular material flowing through the furnace bottom.