JPS58179791A - Circular grate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to improvements in circular grades.

Traditionally, circular gray was used for the purpose of heat treatment of solids.
As shown in FIGS. 1 and 2, there is a charging section 1 for charging the solid 11 to be heat-treated into a circular grate, a preheating chamber 2, a heating chamber 3, a cooling chamber 4, and a discharge section. 5, a divided grate (hereinafter referred to as a grate) 6 on which the solid 11 is placed and moves in the direction of the arrow X, and a gas 1 passing through the cooling chamber 4.
4, a heating gas fan 7 for sending the gas 14 to the heating chamber 3, a preheating gas fan 9 for sending the gas 13 that has passed through the heating chamber 3 to the preheating chamber 2, and a preheating chamber. It is composed of a cooling gas fan 10 and the like that sends the gas 12 that has passed through the cooling chamber 4 to the cooling chamber 4.

The solid 11 to be heat-treated is charged into the circular grate from the charging section 1, passes through the preheating chamber 2, heating chamber 6, and cooling chamber 4 while maintaining a constant layer thickness on the grate 6, and is then transferred to the discharge section. 5, it is discharged to the outside from the circular grate.

The gas 12 used for heat treatment of the solid 11 preheats the solid 11 by heat exchange with the solid 11 in the preheating chamber 2, and the gas 12 is cooled. The cooled gas 12 is guided to the cooling chamber 4 by the cooling gas fan 10, passes through the heated solid layer 11, cools the solid 11, and at the same time the gas 14
is heated.

The heated gas 14 is led to the heater 8 by the heating gas fan 7, and after being further heated, it is led to the heating chamber filter.
The gas 15 passes through the preheated solid layer and heats the solid 11 by 1 Jll, while at the same time being cooled and guided to the preheating chamber 2 by the preheating gas fan 9. The gas 12 below is circular.
Repeat the circulation within the grate as above.

In the case of the above conventional apparatus, the gas 12, 1314 between each chamber is sealed by sealing the upper part of the solid layer and the lower part of the divided grate 6 by means of a labyrinth or the like.

However, in this method a lateral flow 15 of gas within the solid layer 11 occurs. This lateral flow has a flow rate of about 5 to 20 inches of the flow rate of the gas 14, 13.12 guided to each chamber 6°2.4 by each fan 7.9.10, so it reduces thermal efficiency. Problems such as a decline in production and a decline in production are occurring.

+, ', Solved the problems of the conventional device described above, reduced the flow of gas in the direction between the rooms in the solid layer between each room, and improved thermal efficiency and productivity. It was proposed for the purpose of measuring granular solids, which are placed on a plurality of connected divided grate-F and horizontally passed from the charging section through the preheating chamber, heating chamber, and cooling chamber to the discharge section. Heat treatment while moving - "Circular grade" At the same time, install each divided grate between the preheating chamber and the heating chamber, and between the heating chamber and the cooling chamber, sandwiching the grate and granular solid from above and below, respectively. An upper seal stand and a lower seal stand are provided which are longer than the pitch, and an airtight vertical part having a height close to the upper seal stand is provided at one end of the grid-like horizontal part of each divided grate. This relates to a circular grate.

Hereinafter, the present invention will be specifically explained with reference to embodiments shown in FIGS. 6 and 4.

In Fig. 6, 2 is a preheating chamber, 6 is a heating chamber, and the preheating chamber 2
Similar to the preheating chamber 2 shown in FIGS. 1 and 2, the gas 13 that has passed through the heating chamber 3 is fed into the interior by a preheating gas fan, and the gas 12 that has passed through the preheating chamber 2 is A cooling gas fan should be used to feed the cooling gas into the cooling chamber (cooling chamber 4 in Figures 1 and 2). On the other hand, the gas that has passed through the cooling chamber is heated and sent into the heating chamber 3.

16 is a member corresponding to the divided grate 6 of the conventional device,
The divided grate 16 has a fourth
As shown in the figure, it is arranged in an annular shape, and is rotated at a predetermined speed in the downward direction of the arrow by a drive source (not shown). In the case of the present invention, the divided grate 16 has a grid-like horizontal portion 16. as shown in FIG. ] and a vertical 1'''1', 16b standing upright at one end of the horizontal portion 16, and a labyrinth-shaped lower seal plate 17 is provided at the front and rear ends of the lower surface of the horizontal portion 16a. It is rotatably supported by the shaft, and hangs down due to its own weight.20
is an upper annular fixing member (an upper sealing base installed between the preheating chamber 2 and the heating chamber 6), and the upper sealing plate 26 also rotates in a labyrinth shape downwardly on the upper sealing base 20. tE K @ is supported and hangs down due to its own weight. It is desirable that the length A of the upper seal stand 20 is set to 15 @ or more of the installation pitch B of the split grate 16. 19
is a lower seal stand provided at a location corresponding to the upper seal stand 20 in the lower annular fixing member, and the length D of the lower seal stand 19 is equal to 2 of the installation pitch B of the split grate 16.
It is desirable to set the value to at least double. Note that the upper and lower sealing stands 20.19 are also provided on the lower annular fixing member between the heating chamber 5 and the cooling chamber. And, no matter where each divided grate 16 is located between the upper and lower annular fixed members during movement, the upper and lower sealing bases 20.19 and the divided grate 1
6r vertical portion 16b blocks the flow of lateral flow 15 (see FIG. 1) of gas 12, 13, 14, and each chamber 2.
3. The traps are designed to prevent gas flow within the solid 11 layer in the 4-way direction. In this case, theoretically, if the length of the seal stand 19.20 is made longer than the length B of the dividing grate, the flow of gas between each chamber can be blocked. In the illustrated example, the above value is 1-1, considering the play of the joint portions with unequal lengths of each split grate 16 and the allowance in the direction of movement. In addition, the upper surface of the solid layer 110 and the vertical portion 16 of the divided grate 16
It is desirable that the distance C between b and the upper end surface be set to a value that is at least 6 times the average particle diameter of the solids 11, and this determines the layer thickness of the solids charging section 1 (see Figure 1). In this example, solid particles are sandwiched between the vertical portion 16b of the divided grate 16, and a large amount of strength is applied to the vertical portion 16b of the divided grate 16. It is configured as described above, and when the operation of this circular dale F is started, the solids 11 charged from the charging section are placed on the horizontal grate portions 16a of each divided grate 16. , the preheating chamber 2, the heating chamber 3, and the cooling chamber 4, and then being heat-treated and then being discharged from the discharge section 5 to the outside of the system, as in the conventional case.
In this case, in the present invention, one or more divided grate 16 is always located below the top sealing base 20, so that the flow of gas in the vertical direction of the solid packed bed is prevented.

In addition, the vertical part 16 of the partial sealing stand 20 and the divided grate 16
The minimum cross-sectional area portion formed by b (31st and 4th C
x W ) is always located at one location below the upper sealing base 20. Since the flow rate of ventilation in the lateral direction of the solid packed bed is proportional to the ventilation area, in the case of the conventional circular drier 1, it is (C + J) x W, but in the case of the present invention, (.Y)xW, and the lateral ventilation flow rate is significantly reduced by 7 compared to the conventional method, and improvements in thermal efficiency and productivity (amount of heat treatment of solids) are expected.

The circular grate of the present invention has the above configuration,
Therefore, the present invention has the practical effect of realizing a circular grate that eliminates the drawbacks of the conventional device described above.

[Brief explanation of the drawing]

1 and 2 are schematic illustrations of a conventional circular grate, where FIG. 1 is a plan view and FIG. 2 is a C--FIG.
The C-line arrow view, FIGS. 5 and 4 are schematic illustrations of an embodiment of the present invention, FIG. 3 is a sectional view near the preheating chamber and heating chamber, and FIG. 4 is a cross-sectional view of the vicinity of the preheating chamber and heating chamber. It is a sectional view taken along the line E-E. 2: Preheating chamber, 5: Heating chamber, 11: Solid particles, 16: Divided grate, 16d: Grid horizontal section, 16b: Vertical section, 17.18: Seal plate, 19: Lower cylinder function, 20: Upper seal The stand.

Claims (1)

[Claims] In a circular grate in which granular solids are heat-treated while being placed on a plurality of connected divided grate and horizontally moved from the charging section through the preheating chamber, the heating chamber, and the cooling chamber to the discharge section, the preheating chamber An upper seal stand and a lower seal stand, which are longer than the mounting pitch of each divided grate, are provided between the above-mentioned grate and the granular solids from above and below between the heating chamber and the heating chamber, and between the heating chamber and the cooling chamber, respectively. A circular structure characterized in that an airtight vertical part having a height close to the upper sealing base is provided at one end of the lattice-like horizontal part of the lattice.
Great.