JPS621459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a horizontally rotating grate machine.

Traditionally, when processing particulate materials, such as ores or other metal or non-metallic compounds, by heating or cooling or other processes, a grate has been constructed with a gas-containing hood at the top and bottom. A horizontal rotating grate is used that rotates around a vertical axis between the windbox and the windbox.

In this case, methods of confining the gas include a rotary grate machine disclosed in Japanese Patent Application No. 16230/1982 using a liquid sealing device and a device for processing granular materials disclosed in Japanese Patent Application No. 28242/1982.

Figures 1 and 2 respectively show the configuration of the sealing device for the pallet, hood and wind box in Japanese Patent Application No. 16230/1982. Figure 1 is a sectional view taken along line AA in Figure 2; It is a perspective view of a hood and a wind box.

In the figure, a plurality of pallets 3 each have a grate 41 fixed thereto, shafts 43 and 44 extend from the periphery and the inner periphery of the pallets 3, respectively, and wheels 45 and 46 rotate on the respective shafts 43 and 44. are mounted on endlessly on annular rails 5, 6, respectively.

Further, the shafts 43 and 44 have drive wheels 47 and 44, respectively.
48 are mounted close to the wheels 45, 46, and each cooperates with a sprocket (not shown) so that the rotation of the sprocket causes the pallet 3 to be attached to the rails 5, 6 via the wheels 45, 46. It rotates around the vertical axis 1 while moving horizontally along the axis.

Air forced from the air box 11 at the bottom of the pallet 3 along the arrow 93 in FIG. 1 flows through the grate 41 to the inside of the hood 9. In this case, the wind box 11
A device for sealing the annular gap between the inner and outer edges of the hood 9 of the pallet 3 and the pallet 3 is indicated generally at 64.

Since the sealing devices at the outer and inner edges of the track are similar, the sealing device at the outer edge (rail 5 side) of the track will be described.

A gutter 65 containing a cooling liquid is fixed close to the pallet 3 and along the arched upper end of the wind box 11. Separated parallel edges 60, 70
A continuous flange or sidewall 66 having a diameter is attached near the arched outer edge of the pallet.

The shaft 43 of the pallet passes through the outer side wall 66;
A pallet shaft 44 extends through the inner side wall and is also rotatably supported thereon. The pallet 3 has rails 5 and 6
Provides support for the side wall 66 as it advances over the top.

The edge 70 of the side wall 66 extends into the trough 65 lower than the pallet 3 and seals with the liquid therein into the annular gap between the pallet and the wind box 11. A gutter 67 is fixed along the edge 60 of the side wall 66. This gutter 67 is also designed to contain liquid. Dip plate, i.e. flange 6
8 is fixed to the arched edge of the hood 9 and extends into the trough 67, cooperating with the water therein to seal the annular gap between said pallet and the hood 9. In addition, a sealed water gutter 88 is provided at the bottom of the wind box 11.
It is designed to be installed to circulate liquid inside. 89 indicates fine particles spilled from pallet 3.

As mentioned above, this device is a sealing device that utilizes the difference in the head of liquid. Therefore, according to this device, as the pressure in the airtight chamber increases, the pressure in the gutter 6 increases proportionally.
It is necessary to increase the depth of 5, 67 and increase the amount of sealing liquid, which not only increases equipment costs, but also increases the amount of sealing liquid.
There are also structural limitations.

Figures 3 and 4 are a schematic plan view showing an embodiment of a rotary grate machine for cooling granular hot ore (for example, sintered ore), which has a cooling gas waste heat recovery device, and the cooling gas. 1 is an expanded schematic diagram of a grate showing flow;

The airtight device is also used in cases like this example, but in this case, the pressure inside the airtight chamber that acts on the sealing liquid level in the gutter is not the same around the entire circumference.
A level difference occurs in the liquid level at the boundary, but if there is no circumferential partition in the gutter, it is necessary to continuously circulate a large amount of sealing liquid, which has disadvantages such as increased equipment and operating costs. be.

To further explain this embodiment in detail with reference to FIGS. 4 and 5, the inside of the hood 110 and the wind box 111 are partitioned by partition walls 121a, 121b, 121c, 1, respectively.
21d and 122a, 122b, 122c, 1
22d with 4 rooms 123a, 123b, 123c, 1
23d and 123a', 123b', 123c', 12
3d', and the cooling gas is distributed between the three floors 125a, 125b, 125c and the heat exchanger 13.
2. Therefore, during ventilation, 1
23a, 123b, 123c, 123d, 123
The pressures in a', 123b', 123c', and 123d' are different due to pressure loss of the fluid, and the level of sealing liquid in the sealing device has a level difference at the boundary between each chamber.

However, the gutter 116, 116', 117, 1
Since there is no partition wall in the circumferential direction in 17', the sealing liquid moves in the gutter from the high pressure corresponding part to the low pressure corresponding part. Therefore, in order to maintain airtightness,
There are drawbacks such as the need to continuously supply the necessary amount of sealing liquid to maintain these steps and the depth of the gutter to correspond to the amount of circulation.

The present invention aims to eliminate the drawbacks of the airtight device, and is an airtight device that utilizes the difference in water head of the liquid, and includes gutters 116, 116', 11 shown in FIGS. 5 and 6.
Continuous seal rings 118, 118', 119, made of an elastic material such as rubber, etc.
119', each seal ring has an upper outer surface connected to a continuous flange at the inner and outer ends of the hood 110;
That is, continuous flanges close to the inner surfaces of the side walls 114, 114' and the inner and outer sides of the pallet 105, i.e., continuous flanges attached to the side walls 107, 107', i.e., the side walls 115, 11
5' are airtightly pressed by elastic force, and are attached movably in the vertical direction. Also, the bottom surface of each seal ring is caused by its own weight to cause the bottom surface of each seal ring to close to the gutter 116, 116', 117, 11.
7', and is mounted so as to be movable in the horizontal direction against the gas pressure P in the airtight chamber formed by the hood 110 and the pallet 105, the wind box 111 and the pallet, and the weight of the seal ring. Furthermore, each seal ring 118, 11
8', 119, 119' and side walls 107, 107',
114, 114', 115, 115' and gutter 11
6, 116', 117, and 117', a liquid is sealed in the annular airtight chamber formed by 6, 116', 117, and 117' for the purpose of lubricating the seal ring so as to keep the top surface of the seal ring at least at a level completely immersed. It is characterized by its composition.

The present invention relates to a general horizontal rotating grate machine in which a grate rotates around a vertical axis between a gas-confining hood and a wind box in the upper and lower parts, and processes granular materials. Specifically, it can be applied to CDQ, combustion coolers, pelletizing, oil seal carbonization equipment, etc.

Hereinafter, the third, fourth, and third embodiments of the present invention will be described.
This will be explained in detail according to Figures 5, 6a and b.

The drawing shows a typical example of a rotary grate machine for cooling granular hot ore (for example, sintered ore) equipped with a cooling gas waste heat recovery device.

In each figure, a plurality of objects are moved horizontally on annular rails 102, 102' having a center point 101 via shafts 103, 103' and wheels 104, 104' (FIG. 5) by a drive device (not shown). pallets 105 are connected endlessly, and a grate 106 is fixed to each pallet.

The shafts 103, 103' are connected to continuous flanges or side walls 10 adjacent to the inner and outer ends of the pallet.
7, 107' rotatably passes through the wheels 104,
Rail 10 on frame 108 via 104'
2, 102' while supporting the side walls 107, 107'.

The upper part of the pallet 105 has multiple hanging rods 109.
an annular hood 110 supported on the frame 108 at
The lower part has a continuous flange at the upper part, i.e. the side wall 1
12 and 112', and a wind box 111 having a plurality of air-tight valves 113 at its bottom is supported by the frame 108. However, the attachment mechanism for the hanging rod 109 and the frame 108 is not shown.

Inner and outer ends of hood 110 and side wall 10
Continuous flanges, i.e. side walls 114, are provided at the bottom of the inner and outer grate 106 of 7 and 107', respectively.
114', 115, and 115' are removably and airtightly attached to facilitate inspection and maintenance of the inside of the side wall. Also, the grate 1 of the side walls 107, 107'
Gutters 116, 116', 117, 11 are installed on the upper part of 06 and the side walls 112, 112' of the wind box, respectively.
7', and a continuous seal ring 11 made of an elastic material such as oil-resistant or water-resistant rubber.
8, 118', 119, 119' are provided, and the pallet 105 and the hood 110 and the pallet and the wind box 111 are provided.
Seal the annular gap between the That is, the seal ring has an inverted L-shaped cross section, and has side walls 114 and 11 at the top a and bottom b of the outer circumferential side, respectively.
4', 115, 115' and gutter 116, 116',
117, 117', and is attached so as to be movable in the vertical direction at the side surface a and horizontally at the bottom b.

In addition, in each of the annular gaps, a liquid such as water or oil for lubricating the close contact part of the seal ring is applied.
The seal ring is sealed at a height such that at least the top surface of each seal ring is completely immersed in the liquid. Therefore, the side wall 114,
Above 114' are liquid supply valves and pipes 120, 12.
0′, and although not shown, the side wall 1 of the wind box
12, 112' or the bottom of the gutter 117, 117',
Similarly, a liquid supply pipe and a valve are provided. Furthermore, side wall 1
14, 114' outer surface and side wall 112 of the wind box,
Small diameter pressure balance pipes 135a, b, c, d and 135a', b', c',
d' is the area 123a, b, c, d, a',
Provide at least one location for each of b', c', and d' and open it to the outside of the airtight room (atmosphere side), so that the seal ring is always immersed below the liquid level against fluctuations in gas pressure P in the hood and wind box. Let it happen. In addition, on the bottom plate of the gutter, there is a pipe and valve 136 for taking out lubricating liquid and dust accumulated in the gutter, and a pipe and valve 137 for discharging leakage liquid caused by uneven wear of the seal ring due to operation.
An appropriate number of each are provided in the circumferential direction.

Since each seal ring is pressed outward and downward in response to the gas pressure P in the airtight chamber, it is necessary to have the strength necessary to maintain airtightness depending on the magnitude of the gas pressure. For this purpose, the material, shape, thickness, etc. of the elastic body should be taken into account, or the enlarged view of section X in FIG.
As in the embodiment shown in Fig. 1, a continuous reinforcing ring 118a made of, for example, a steel plate, has an inner diameter slightly larger than the outer diameter of the seal ring body, and is attached to the outer periphery of the seal ring body.
is provided, and is pressed against the reinforcing plate which expands in response to the gas pressure P during gas ventilation, thereby maintaining the strength capable of maintaining the airtight performance in the seal portions a and b.

As shown in Figures 3 and 4, the airtight area between the pallet and the hood is provided by partitions 121a, b, c, and d, and the airtight area between the pallet and the wind box is provided by partition 121.
22a, b, c, d, respectively, area 123
a, b, c, d, 123a', b', c', d', and the cooling gas for the hot ore 124 on the pallet flows from the blower 125a to the pipes 126, 127, the blower 125b, the pipe 128, 129, blower 125
c, tubes 130, 131, heat exchanger 132 and tube 1
There are 33 routes that circulate through each area.
In addition, 134 in FIGS. 3 and 4 indicates a hot ore charging inlet.

Figures 6a and 6b show other embodiments of the seal ring. In the embodiment shown in FIG. 5, the reinforcing plate 118a is used as a method of imparting strength to the elastic seal ring.
The cross-sectional shape of the elastic body is shown in Figure 6a,
By providing a continuous flange 138d extending outward at least above the lower sealing surface b at the lower part of the seal ring 138 as shown in FIG. 1B, the necessary strength can be provided without a reinforcing plate.

Since the present invention has the above configuration, the annular gap between the pallet and the hood and between the pallet and the wind box is
During ventilation, the seal ring is compressed horizontally at the seal part a by the elastic force of the seal ring, the internal pressure P, and the water head of the lubricant, and at the same time, the seal ring's own weight and the width of the seal ring width B ₁ and the bottom width B ₂ are compressed. A force corresponding to the difference in gas pressure P presses downward at the bottom part b, resulting in a complete seal, and when ventilation is stopped, the elastic force of the seal ring, the head of the liquid, its own weight, and the water head cause a , b is kept airtight.

Generally, gutters and side plates 114, 114', 11
5,115' have a steel plate welded structure and many have a diameter exceeding 10 m, so there are errors in the circularity of the seal part a between the seal ring and the side plate and flatness of the seal part b between the gutter and the seal ring. The error is from several mm to several tens of mm.
However, in the present invention, airtightness can be easily maintained by expanding and contracting the elastic seal ring. Further, since the seal ring portion is always lubricated with liquid, there is little wear and tear, and even if it wears out, it expands and contracts due to the gas pressure P and the liquid head, so that good airtightness can always be maintained. In addition, depending on the magnitude of the gas pressure P, the weight of the seal ring and the width of the upper surface of the ring
Any H dimension can be determined by freely selecting the dimensions of B ₁ and bottom width B ₂ . Therefore, compared to conventional liquid sealing systems, it is possible to use extremely shallow gutters, so the compact structure allows for easy airtight sealing even against higher gas pressures than in the past, and it also circulates a large amount of sealing liquid. There will be no need for it. In addition, as mentioned above, the lubricant level in the seal ring part can be adjusted against fluctuations in gas pressure in the circumferential direction of the airtight part by providing a small-diameter pressure balance pipe.
Since the gas is always maintained substantially uniformly to a practically acceptable level, the flow of gas between regions having different gas pressures in the annular gap can be stably suppressed. Therefore, there is an advantage that the processing steps in the apparatus can be operated stably and efficiently.

[Brief explanation of the drawing]

Figure 1 is a sectional view taken along the line A--A in Figure 2 of the liquid sealing device for pallets, hoods and wind boxes in JP-A-46-16230, Figure 2 is a perspective view thereof, and Figure 3 is A schematic plan view of a horizontal rotary grate machine equipped with the sealing device of the present invention, FIG. 4 is an expanded schematic diagram of the grate showing the flow of gas, and FIG. 5 is an enlarged view of the B-B arrow in FIG. 3. 6a and 6b are cross-sectional views showing other embodiments of the seal ring. 3,105...palette, 5,6,102,1
02'...Rail, 41,106...Grate, 6
4... Sealing device, 107, 107'... Moving side wall, 110... Hood, 111... Wind box, 11
2,112',114,114',115,11
5', 116, 116'...Side wall, 117, 11
7'...Gutter, 118, 118', 119, 11
9', 138... Seal ring, 120, 12
0'...Lubricant supply valve and pipe, 135a, 135
b, 135c, 135d, 135a', 135b'1
35c', 135d'...pressure balance tube, 121
a, 121b, 121c, 121d... partition,
123a, 123b, 123c, 123d, 12
3a', 123b', 123c', 123d'...pallet upper area and pallet lower area, 125a, 1
25b, 125c...Blower, 132...Heat exchanger, P...Gas pressure.

Claims (1)

[Claims] 1 each having a circular rail and a grate for supporting granular material consisting of isolated grate elements, a plurality of pallets guided and moved on the rails, and outer and inner annular members supporting the pallets; , a device for moving the pallet and annular member along the rail, and a hood device disposed over the rail and the pallet to cover at least a portion of the rail, trapping gas passing through the grate; The airtight chamber is formed by a wind box device installed at the lower part of the pallet so as to form a chamber together with the hood, and the annular gap between the pallet and the hood and between the pallet and the inner and outer edges of the wind box forms the airtight chamber. An annular chamber formed by a gutter provided above the grate on the side walls of the moving inner and outer annular members and side walls provided at the lower part of the inner and outer walls of the hood, and the wind box. An annular chamber formed by a gutter provided on the inner and outer walls of the upper part and a side wall provided at a lower position of the grate of the annular member is provided, and a continuous seal ring made of an elastic body is provided in each of the annular chambers, The seal ring has a cylindrical shape, and has a continuous flange portion having an outer diameter at least larger than the outer diameter of the cylindrical portion and an appropriate thickness at the upper portion, and the outer surface of the flange is elastically attached to the inner surface of the side wall of the hood. The lower end of the seal ring forms an upper flange, and the outer surface of the flange is airtightly crimped to the inner surface of the side wall of the hood by elastic force. , the lower end of the seal ring has a width smaller than the radial width of the upper flange, and is airtightly crimped to the bottom plate of the gutter by its own weight, and is movable in the horizontal direction. In the annular airtight chamber provided with the seal ring, a liquid for lubricating the sliding surface of the seal portion of the seal ring is filled so as to be at least above the top of the seal ring at all times, and in the annular airtight chamber provided with the seal ring. , a pressure balance tube is attached to the stationary side wall, that is, the side wall of the hood and the side wall of the wind box side, each opening to the atmosphere so as to maintain the sealed liquid level in the circumferential direction, and the pressure balance tube is
A sealing device for a horizontal rotating grate machine, characterized in that at least one sealing device is provided for each compartment in the circumferential direction between the pallet and the hood and between the pallet and the wind box.