JPH0238200Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a grate for municipal waste incinerators.

Structure of conventional example and its problems Regarding conventional grate for municipal waste incinerator, Part 1
This will be explained using FIGS. Fig. 1 is a plan view of the grate stand, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 1. (not shown)
fixing parts 3a, 3b having holes 2a, 2b through which bolts (not shown) are inserted for attachment to the
, support parts 4a and 4b that are integrally formed with the fixing parts 3a and 3b and support grate plates to be described later, and fixing parts and support parts 3a and 4 that are integrally formed with these parts.
side wall portions 6a, 6b connected to each other by a, 3b, 4b and having thick portions 5a, 5b at upper ends;
It is composed of. In addition, Fig. 4 is a plan view of the grate plate, and Fig. 5 is a side view of the same.
The main body part 8, the rib part 9 protruding from the lower surface of the main body part 8, and the support parts 4a, 4 of the grate stand 1
It is comprised of engaging protrusions 10a and 10b that engage with b. One grate unit is composed of the one grate stand 1 and one grate stand 7 placed on this grate stand 1, and this one grate unit is placed on the support beam. A large number of them are arranged in a row, and a large number of these are arranged in parallel to form the entire grate. The large number of parallel fire grates are arranged such that movable fire grates and fixed fire grates are alternately located.

However, in such a conventional grate for a municipal waste incinerator, the grate base 1 and the grate plate 7 are not sufficiently cooled, and the central part of the large grate plate 7 becomes a blind spot for the circulation of combustion air. , grate stand 1
Combustion ash gets stuck in the gap between the thick parts 5a, 5b of the grate plate 7 and the main body part 8 of the grate plate 7, obstructing the circulation of combustion air, and causing uneven combustion, resulting in a decrease in combustion efficiency and excessive combustion. There was a problem that overfire damage occurred due to Furthermore, if a portion of the grate plate 7 is damaged, the entire grate plate 7 must be replaced, which is uneconomical.

Purpose of the invention The present invention eliminates the above-mentioned drawbacks of the conventional technology.It has a sufficient cooling effect, reduces the occurrence of overburn damage, improves the circulation of combustion air, and further improves the An object of the present invention is to provide a grate for a municipal waste incinerator that can be economically replaced even if it is damaged.

Structure of the invention In order to achieve the above object, the grate for a municipal waste incinerator of the invention includes a fixed part fixed to a support beam,
A grate base is provided, which includes a support part that supports the grate plate, and a pair of side wall parts that are connected to each other by the fixing part and the support part and have a thick portion at the upper end, and that engages with the support part. A plurality of grate plates each having an engaging recess and a thick portion at the upper end are arranged in parallel between both side walls of the grate stand, and the inner surfaces of the thick portions of the both side walls and each of the grate plates A large number of grooves are formed on both sides of the thick portion of the grate plate, and these grooves allow the thick portions of the respective grate plates to face each other, and the thick portion of the grate plate to the side wall of the grate stand. A large number of through holes are formed on the surface facing the thick part of the part.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 6 to 10.

FIG. 6 is a plan view of a grate base for a municipal waste incinerator grate according to an embodiment of the present invention, and FIG.
A sectional view taken along the - line in the figure, Figure 8 is the 6th section.
In the cross-sectional view taken along the - line in the figure, this grate stand 11 has holes 12a and 12 through which bolts (not shown) for fixing it to a support beam (not shown) are inserted.
Fixing parts 13a, 13b in which b is bored, supporting parts 14a, 14b that support grate plates, which will be described later, and these fixing parts 13a, 13b and supporting parts 14a, 1.
A pair of side wall portions 16a, 1 which are connected to each other by 4b and have thick portions 15a, 15b at their upper ends.
6b, and these are integrally formed. A large number of grooves 17 each having a semicircular cross section that tapers upward from the bottom are formed on the inner surfaces of the thick portions 15a and 15b of the pair of side walls 16a and 16b. Further, the support portion 14a is inclined toward the front side (left side in FIG. 7) from the bottom to the top.

Fig. 9 is a plan view of a grate plate of a grate for a municipal waste incinerator according to an embodiment of the present invention, and Fig. 10 is a side view of the same. It has a T-shaped cross section, and has engaging recesses 20a and 20b that engage with the support portions 14a and 14b of the grate stand 11. On both sides of the thick portion 19, there are a number of grooves 2 having a semicircular cross section that taper from the bottom to the top.
1 is formed. Note that 22 is the engagement recess 2
A rib 23 having a semicircular cross section constituting 0b is a rib that connects the rib 22 and the thick portion 19.

A plurality of the grate plates 18 (in this embodiment, three grate plates) are provided between the side wall portions 16a and 16b of the grate stand 11.
grate stand 11 in a state where the supporting parts 14a and 14b are fitted into the engaging recesses 20a and 20b.
A plurality of grate plates 18 are supported by. In this state, thick portions 1 of adjacent grate plates 18
A large number of through holes tapering from below to above are formed by grooves 21 on the opposing surface of the grate base 9, and both side wall portions 16a of the grate stand 11,
Thick wall portions 15a, 15b of 16b and grate plate 18
A similar through hole is also formed by the grooves 17 and 21 on the surface opposite to the thick portion 19 .

This one grate stand 11 and a plurality of grate plates 1
8 constitute one unit of the grate, and this one unit of the grate is connected in many rows on a pair of support beams as in the conventional case, and furthermore, a large number of these are arranged in parallel to constitute the entire grate. As in the past, a large number of grate lines are arranged in parallel, and each row is alternately made into a fixed grate and a movable grate, and the grate plate 7 of each row is located at the front end (see (left end) is disposed overlying the rear end of the grate plate 7 on the front side thereof.

Hereinafter, the effects of the above configuration will be explained. Since grooves 17 are formed on the inner surfaces of the thick portions 15a and 15b on both side walls 16a and 16b of the grate stand 11, the cooling area is increased and the cooling effect is high. For example, the radius of curvature of the groove 17 is
3 mm, and if 16 grooves 17 are formed in each of the thick portions 15a and 15b, the cooling area will be about 1.6 times that of the conventional one. Further, the grate plate 18 is composed of a plurality of pieces, and grooves 21 are formed on both sides of each thick portion 19.
Since the cooling area is increased, the cooling area is increased.
High cooling effect. For example, three grate plates 18,
The radius of curvature of the groove 21 is 2 to 3 mm, and each thick portion 19
If 16 grooves 21 are formed on each side of the cooling area, the cooling area will be approximately five times that of the conventional one. Therefore, damage to the grate stand 11 and the grate plate 18 due to overburning can be effectively prevented.

In addition, each thick portion 19 of the adjacent grate plate 18
, the thick wall portion 19 of the grate plate 18, and the thick wall portion 1 of the side walls 16a, 16b of the grate base 11.
Since through holes are formed by the grooves 17 and 21 on the surface facing the grate bases 5a and 15b, combustion air flows through the grate base 1.
1 and the grate plate 18, and is evenly supplied to the waste on the grate plate 18, thereby maintaining uniform combustion over the entire grate surface. Therefore, for the same calorific value of the garbage, the dispersion of heat over the entire grate is promoted, and the conventional problem of concentration of heat load due to combustion in extreme parts can be solved. Damage to the grid plate 18 due to overburning can be effectively prevented.

Furthermore, due to the presence of the through holes formed by the grooves 17 and 21, the gaps between the grate base 11 and the grate plates 18 and the gaps between the grate plates 18 are not clogged with combustion ash, and the through holes are prevented from clogging. Ensuring the nozzle-effect blowing of combustion air into the waste, which promotes the agitation of the waste, improves the combustion efficiency, and improves the grate cooling heat transfer coefficient by increasing the air flow rate. This becomes even more effective by making the shape of the through hole tapered from the bottom to the top as in this embodiment.

Moreover, since the grate plates 18 are made up of a plurality of pieces, even if they are worn out or oxidized, only the one with a large amount of thinning needs to be replaced, which is economical. In addition, the limit for the amount of thinning of one grate plate 18 is first set,
By preparing a product with a width that takes into account the dimensions, it is possible to replace only one grate plate 18 instead of replacing a set of three pieces.
By replacing the grate plates 18 and 18, the gap between the grate base 11 and the grate plate 18 can be adjusted economically.

In addition, conventionally, the fixing parts 3a, 3b and the supporting part 4a,
4b were connected to each other, so the second
Combustion air in the direction of arrow A in the figure is blocked at this part,
Therefore, there was a problem that the cooling of the back surface of the grate plate 7 directly above this part was hindered, but as in this embodiment, the fixing parts 13a, 13b and the supporting parts 14a, 1
4b is separated, combustion air can flow in the direction of arrow B in FIG. 7, and the grate plate 18 immediately above can be effectively cooled.

Conventionally, when the movable grate retreats, a wide space is created between the tip of the grate (the left end in Figures 1, 2, 4, and 5) and the garbage, and the resistance object disappears. Therefore, combustion air intensively flows in from here, and rapid combustion of waste tends to occur in this area.As a result, the amount of heat generated by combustion increases at a higher rate than cooling due to an increase in the amount of air, which causes overheating of the grate. However, in this embodiment, the shape and dimensions minimize the above-mentioned space to prevent concentrated blowing of combustion air, and the grooves 17 and 2
The through holes constituted by No. 1 ensure uniform distribution of cooling and combustion air even at the tip of the grate, thereby preventing overburning.

Conventionally, the support portion 4a of the grate stand 1 was inclined backward from the bottom to the top, so when removing the grate plate 7, lift the grate plate 7 and move it rearward, and when installing it, Therefore, when removing and installing, the grate plates 7 of the target grate must be removed or installed sequentially from one end or the other end of a large number of grate lines. Although there was a problem that it could not be installed and required a long time to assemble and disassemble, if the support part 14a of the grate stand 11 is tilted in the opposite direction from the conventional example, as in this embodiment, the grate plate By simply pulling up the grate plate 18 forward and upward, the grate plate 18 can be removed independently without removing the adjacent grate plate 18, and the grate plate 18 can be installed independently in the reverse order, greatly reducing disassembly and assembly time. can.

Effects of the invention As explained above, according to the invention, the grate plate is divided into a plurality of pieces, and through-holes are formed in the opposing faces of the grate plates and in the thick parts of the grate base and the grate plate. This makes it possible to increase the cooling area and uniformly supply combustion air, thereby preventing overfire damage and improving combustion efficiency. Furthermore, since the grate plate is divided into a plurality of pieces, only the worn or damaged grate plate needs to be replaced, which is economical.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional grate stand, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is a conventional grate stand. FIG. 5 is a side view of the grate plate, FIGS. 6 to 10 show an embodiment of the present invention, FIG. 6 is a plan view of the grate stand, and FIG. 8 is a sectional view taken along line - in FIG. 6, FIG. 9 is a plan view of the grate plate, and FIG. 10 is a side view of the same. 11...Grate stand, 13a, 13b...Fixing part, 14a, 14b...Supporting part, 15a, 15b
...Thick wall portion, 16a, 16b...Side wall portion, 17
... Groove, 18 ... Grate plate, 19 ... Thick part,
20a, 20b...engaging recess, 21...groove.

Claims (1)

[Scope of utility model registration request] A grate base consisting of a fixing part fixed to a support beam, a support part supporting a grate plate, and a pair of side walls connected to each other by the fixing part and the support part and having a thick part at the upper end. In addition, a plurality of grate plates each having an engagement recess that engages with the support portion and having a thick portion at an upper end are arranged in parallel between both side walls of the grate stand, and the thick wall portion of the both side walls is A large number of grooves are formed on the inner surface of the portion and on both sides of the thick portion of each of the grate plates, and these grooves allow the thick portions of each of the grate plates to form opposite surfaces and the thick portions of the grate plate. 1. A grate for a municipal waste incinerator, characterized in that a large number of through holes are formed on the opposing surfaces of the thick portion and the thick portion of the side wall portion of the grate stand.