JPS62170430A - Sintering method and vertical type sintering machine - Google Patents

Abstract

PURPOSE:To inexpensively produce sintered ore having good quality without uneven sintering by changing the flow rate of the exhaust gas to be sucked in a horizontal direction in the stage of sucking the exhaust gas generated by sintering of a sintering raw material. CONSTITUTION:Air is supplied to the lower side of the raw material layer 6 and is discharged through a calcination zone 8, the raw material layer 6 and a suction port 20 to the outside by which the sintering raw material 3a is sintered. A level distribution meter 29 for the calcination zone feeds a signal to a programmer 28 when variance arises in the temp. distribution of the calcination zone 8. The programmer 28 feeds the signal to a flow rate controller 26. The controller 26 transmits the signal to each positioner 27 to instruct the opening and closing degrees of a flow rate control valve 26. The flow rates of the exhaust gases sucked from the central part of the zone 8 and the suction part 21 near the central part are thereby relatively increased when, for example, the temp. in the central part of the zone 8 decreases and an unbalance arises in the level of the calcination zone. The flow rate of the exhaust gas to be sucked from the suction part 21 of the suction port 20 is thereby controlled, by which the sintered cake 10 having no uneven sintering is obtd.

Description

[Detailed description of the invention]

"Industrial Applicability" The present invention relates to a sintering method and a vertical sintering machine for manufacturing sintered ore in bulk by sintering powdered ore. "Prior Art" Generally, when producing sintered ore for blast furnaces by sintering powdered ore, a vertical sintering machine is often used. Conventionally, a vertical sintering machine A shown in FIG. 2 has been known as this type of vertical sintering machine. In the figure, reference numeral 1 is the sintering machine main body. The sintering machine main body 1 has a hollow portion 2 formed in the vertical direction, and its cross section has a horizontally long rectangular shape. At the top of the sintering machine body l, there is a raw material hopper 3.3 and a drum that continuously supplies the powdered sintering raw material 3a stored in these raw material hoppers 3.3 to the hollow part 2 of the sintering machine body l. A charging device 5 consisting of a feeder 4.4 is provided. Further, the hollow portion 2 of the sintering machine main body 1 is filled with a sintering raw material 3a supplied from a charging device 5 to form a raw material layer 6. The raw material layer 6 is sintered by being ignited by an ignition device 7.7 provided on the side of the sintering machine main body l. That is, once the raw material layer 6 is ignited, sintering proceeds at a position directly above the igniter 7.7, and a sintered zone 8 is formed there, and sintering has already been completed at the bottom of this sintered zone 8. A sintered cake IO is formed. This sintered cake IO is transferred downward at a predetermined speed by a transfer device 11.11 provided on the side of the sintering machine main body 1, and is crushed by a crushing device (not shown). An air supply machine (not shown) for supplying air to the sintering zone 8 is provided at the lower part of the sintering machine main body 1 . In addition, a horizontally elongated suction port 12 is provided on the side of the sintering machine main body l.
．． 12 are formed respectively. The suction port 12.12 is located above the firing zone 8 and on the side of the raw material layer 6, and is provided for discharging the air burned in the firing zone 8. These suction ports 12.12 include
Register users 13 and 13 are each provided with a reducer 13.
．． 13 is connected to an exhaust blower (
(not shown) is provided. The exhaust gas discharged from the suction port 12.12 by this exhaust blower is transferred to the exhaust pipe 1.
The flow rate is adjusted by a flow rate adjustment valve 15.15 provided in the middle of 4.14. "Problems to be Solved by the Invention" By the way, in the vertical sintering machine A described above, the following problems occur due to the long firing zone 8 in the horizontal direction. (a) For example, an imbalance in the firing zone level is likely to occur between the ends and the center of the firing zone 8. (b) Since the exhaust gas inhalation cannot be adjusted along the horizontal direction of the suction port, an imbalance tends to occur at the level of the firing zone. (c) Due to the above (a) and (b), a blow-through occurs partially in the firing zone 8, causing uneven firing of the sintering raw material;
Good quality sintered ore is not produced. As a means to solve such problems, when an imbalance occurs at the level of the sintering zone, there is a method of forcibly applying heat to the lower temperature area using the ignition device 7.7 to sinter the sintering raw material. be. However, applying heat during the firing of the sintering raw material results in wasteful consumption of firing energy, and as a result, a new problem arises in that the manufacturing cost of the sintered ore increases. This invention was made in view of the above circumstances, and an object thereof is to obtain a vertical sintering machine that solves the above drawbacks. "Means for Solving the Problem" The sintering method of the first invention supplies sintering air from below to the raw material layer consisting of sintering raw materials fed from the upper part of the sintering machine body. In a sintering method in which exhaust gas generated as the raw material is sintered is sucked from the side of the raw material layer and the raw material layer is sintered while moving the raw material layer downward, the exhaust gas sucked from the raw material layer is It is characterized by changing in the horizontal direction. In addition, the vertical sintering machine of the second invention supplies sintering air from below to the raw material layer made of sintering raw materials fed from the upper part of the sintering machine main body, and as the sintering raw materials are sintered. In a vertical sintering machine that sinters the raw material layer while moving it downward while suctioning the exhaust gas generated from the side of the raw material layer, the suction port provided on the side of the sintering machine body is In addition to providing a plurality of suction sections divided horizontally, an exhaust blower for sucking exhaust gas from these suction sections is provided, and a flow rate adjustment mechanism for adjusting the suction amount of exhaust gas is provided between the suction section and the exhaust blower. It is characterized by "Example" Hereinafter, an example of the present invention will be described with reference to the drawings. No.

FIG. 1 is a diagram showing the configuration of a vertical sintered fiB according to the present invention. In addition, in the figure, the same components as those of the vertical sintering machine A shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. In FIG. 1, reference numerals 20 and 20 are suction ports. The suction port 20.20 is a horizontally long port formed on the side of the sintering machine main body 1, and is divided horizontally into suction portions 21.20.
21. -・. These suction parts 21.21,・
Each of the two is provided with a reducer 22,22. These register users 22, 22, . . . are connected to an exhaust blower (not shown) via exhaust gas branch pipes 23, 23, . The exhaust gas branch pipes 23, 23, . . . are each provided with a flow control valve 25, 25, . . such as a butterfly valve. These streams m8
A predetermined opening degree is set by positioners 27, 27 provided between the control valves 25, 25, . Further, a signal is sent to the amortization meter 26 from a programmer 28. This programmer-2
8, signals from a number of temperature detection terminals (not shown) arranged inside the raw material layer 6 of the sintering machine body are inputted via a firing zone level distribution meter 29. . Here, the surface flow m control valve 25.25,... is the programmer 2
This is provided to adjust the amount of exhaust gas sucked from the suction parts 21, 21, . . Then, the surface reducer 22.22,..., exhaust gas branch pipe 23.23,..., exhaust gas main pipe 24.24, flow rate control valve 25.25,..., positioner 2, 7, 27,..., flow rate controller. 26, the programmer 28, the firing zone level distribution meter 29, and the temperature detection end, the flow rate adjustment mechanism 3Ih
<To be formed. Next, a sintering method using the vertical sintering machine B will be described. First, air is supplied below the raw material layer 6 by an air supply device, and this air is discharged to the outside via the firing zone 8, the raw material layer 6, and the suction port 20, 20 by an exhaust blower. Sinter the raw material. At this time, suction port 2
0.20 of each suction part 21, 21. The amount of exhaust gas emitted from ... is controlled as follows. When a variation occurs in the temperature distribution of the firing zone 8, the firing zone level distribution meter 29 sends a signal to the programmer 28, and the programmer 28 sends a signal from the firing zone level distribution meter 29 to the flow rate controller 26. Then, the flow rate regulator 26 transmits the signals to the positioners 27, 27, . . . to instruct the opening/closing degree of the flow rate regulating valves 25, 25, . As a result, for example, if the temperature at the center of the firing zone 8 decreases and an imbalance occurs at the firing zone level, the flow 111
] The knot mechanism 31 relatively increases the flow rate of the exhaust gas sucked from the central portion of the firing zone 8 and the suction portion 21 near the central portion of the firing zone 8 . On the contrary, for example,
When the temperature at the end of the firing zone 8 decreases and an imbalance occurs at the firing zone level, the flow rate of the exhaust gas sucked from the end of the firing zone 8 and the suction section 21 near the end of the firing zone 8 decreases. is relatively reduced. By the sintering method using the vertical sintering machine B as described above, the claws of the exhaust gas sucked from the suction portions 21.degree.2+, . . . of the suction ports 20.20 are controlled. In the above-mentioned vertical sintering machine B, if the temperature distribution of the firing zone 8 varies and the firing zone level becomes unbalanced, each suction section 21.
The amount of exhaust gas sucked from the firing zones 1, . . . is adjusted, and the flow rate of air passing through the firing zone 8 is partially controlled. Therefore, in the vertical sintering machine B, the sintering raw material can be sintered without creating a blow-through in the firing zone 8 unlike the conventional vertical sintering machine A. ,
It is possible to produce high quality sintered ore. Furthermore, when the firing zone level becomes unbalanced, in the vertical sintering machine B, the amount of air passing through the firing zone 8 can be controlled by the flow rate adjustment mechanism 3I, so sintering energy is wasted. It is possible to produce sintered ore without consuming it,
The manufacturing cost of sintered ore becomes cheaper. "Effects of the Invention" As explained in detail above, according to the sintering method of the present invention, the amount of exhaust gas sucked from the raw material layer is varied in the horizontal direction, thereby reducing the amount of gas in the firing zone. The air passage m can be partially changed, and this has the effect that high-quality sintered ore with no uneven burning can be manufactured at a low cost. Further, according to a vertical sintering machine formed by applying the above sintering method, the suction port is divided into a plurality of suction sections in the horizontal direction, and the suction from each suction port is divided into a plurality of suction sections in the horizontal direction. By installing a flow mA node mechanism that adjusts the amount of exhaust gas suction, it is possible to partially change the amount of air passing through the sintering zone, which makes it possible to produce high-quality sintered ore without sintering at a low cost. It has the effect of being able to

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a vertical sintering machine B shown as one embodiment, and FIG. 2 is a schematic diagram showing the configuration of a conventional vertical sintering machine 1aA. 1 sintering machine main body, 6 raw material layer, 9 sintering zone, 20 suction port, 21 suction section, 3I flow rate adjustment mechanism, ■3 vertical sintering machine.

Claims (2)

[Claims] (1) Sintering air is supplied from below to a raw material layer consisting of sintering raw materials fed from the top of the sintering machine main body, and exhaust gas generated as the sintering raw materials are sintered is directed to the side of the raw material layer. A sintering method in which the raw material layer is sintered while being sucked from the raw material layer while moving the raw material layer downward, characterized in that the amount of exhaust gas sucked from the raw material layer is varied in the horizontal direction. (2) Sintering air is supplied from below to the raw material layer consisting of the sintering raw material fed from the top of the sintering machine main body, and the exhaust gas generated as the sintering raw material is sintered is directed to the side of the raw material layer. In a vertical sintering machine that sinters the raw material layer while moving it downward while suctioning from the sintering machine body, a suction port provided on the side of the sintering machine body is divided horizontally to form a plurality of suction parts. A vertical sintering machine characterized in that it is also provided with an exhaust blower that sucks exhaust gas from these suction sections, and a flow rate adjustment mechanism that adjusts the amount of exhaust gas sucked between the suction section and the exhaust blower. .