JP2023120488A - Intake/exhaust device of sintered ore cooling machine - Google Patents

Abstract

To provide an intake/exhaust device of a sintered ore cooling machine, even if a gap is generated between each trough carriage and a hood due to long-time deterioration or the like, capable of preventing the leakage of gas or dust from a seal part between each trough cartridge side and the hood side to an outside system.SOLUTION: An intake/exhaust device 3 of a sintered ore cooling machine 1, in which cooling gas is made to pass through the inside of a layer of sintered ores 15 laminated on a plurality of trough carriages 5 covered by a hood 13 to cool the sintered ores 15, comprises: a cooling gas pressure-feed apparatus 7 feeding the cooling gas to the lower part of the trough carriages 5; an exhaust gas suction apparatus 9 for exhausting exhaust gas from a space covered by the hood 13 to the outside; and a control apparatus 11 controlling at least one of the cooling gas pressure-feed apparatus 7 and the exhaust gas suction apparatus 9 so as to reduce the flow rate of the cooling gas than the flow rate of the exhaust gas.SELECTED DRAWING: Figure 1

Description

In the present invention, sintered ore sintered by a sintering machine is stacked on a plurality of trough vehicles, and a cooling gas is passed through the layers of the sintered ore while moving the plurality of trough vehicles. The present invention relates to an air supply/exhaust device for a sintered ore cooler that effectively cools the sintered ore.

Conventionally, sintered ore sintered by a sintering machine is stacked on a plurality of trough carriages, and a cooling gas is passed through the layers of sintered ore from the bottom to the top while moving the plurality of trough carriages. A sintered ore cooler for continuously cooling sintered ore is known.

In such a sinter cooler, in order to suppress the leakage of sinter dust to the outside of the system due to the recent heightened environmental regulations, at least a part of the upper part of the trough truck is covered with a hood and sealed. A seal mechanism is provided between the hood and the trough carriage to keep the same.

JP-A-59-13892

Since the trough truck is a movable body that runs on rails, and the hood is a fixed body that is fixedly installed on the moving trough truck, the seal mechanism must be provided so that they can move relative to each other. As such a sealing mechanism, for example, one side in the width direction of a sealing material such as a long cloth is attached to the hood on the fixed side so that the sealing material hangs down, and the lower side of this sealing material is attached to the side of the trough truck. There is a method of sealing the gap between the hood and the trough carriage by making surface contact with the hood. Further, as disclosed in Patent Document 1, there is also a water sealing type seal that uses water stored in a water sealing box for sealing.

However, when the cloth is used, gas and dust may leak due to wear of the cloth due to deterioration over time and the occurrence of gaps in the height direction and width direction between the hood and the trough truck. In particular, if the side wall of the trough truck is deformed, the trough truck sinks due to wear of the wheels, or the eccentricity in the axle direction of the trough truck occurs, and the gap between the trough truck and the hood expands, the amount of leakage increases. will do. There is also a method of mechanically pressing such a sealing material (cloth, etc.) against the sealing surface (trough truck) at all times. leaks more easily.

Further, in the case of the water sealing type seal, if the leaked sintered ore accumulates in the water sealing box, it may cause resistance during rotation of the cooler, or the water sealing function itself may be lost.

The present invention was devised to solve this problem. Due to aged deterioration, etc., the side wall of the trough carriage sinks or deforms, reducing the sealing effect of the sealing mechanism and creating a gap between the trough carriage and the hood. Provided is an air supply/exhaust device for a sinter cooler capable of preventing gas and dust from leaking out of the system from a sealing part between a trough truck side (movable side) and a hood side (fixed side) even in the case of a sintered ore cooler. It is intended to

(1) A supply and exhaust device for a sinter cooler according to the present invention stacks sintered ore sintered by a sintering machine on a plurality of trough carriages whose upper at least part is covered with a hood, An air supply and exhaust device for a sintered ore cooler that continuously cools the sintered ore by passing a cooling gas through the layer of the sintered ore while moving the plurality of trough trucks,
a cooling gas pumping device for supplying the cooling gas below the plurality of trough trucks;
an exhaust gas suction device for sucking exhaust gas from the space covered by the hood and discharging it to the outside;
a control device configured to control at least one of the cooling gas pumping device and the exhaust gas suction device such that the flow rate of the cooling gas is smaller than the flow rate of the exhaust gas;
It is characterized by comprising

(2) In addition, in the device described in (1) above, the cooling gas pumping device has a pumping pipe provided with a cooling gas flow meter for measuring the flow rate of the cooling gas,
The exhaust gas suction device has an exhaust pipe provided with an exhaust gas flow meter for measuring the flow rate of the exhaust gas,
At least one of the pressure feed pipe and the exhaust pipe is provided with a flow rate adjustment valve,
Preferably, the control device is configured to control the flow control valve based on the measured value of the cooling gas flow meter and the measured value of the exhaust gas flow meter.

(3) In addition, in the device described in (2) above, the control device determines the relationship of (flow rate of the exhaust gas)≧(flow rate of the cooling gas)−(flow rate of the leaked air) based on the leaked air amount. Preferably, the cooling gas flow control valve and the exhaust gas flow control valve are controlled so as to satisfy the conditions.

(4) In addition, in any one of the above (1) to (3), for each trough carriage group consisting of at least one of the plurality of trough carriages, the space covered by the hood A pressure gauge for measuring pressure and the flow control valve are provided,
Based on the pressure value obtained from the pressure gauge, the control device increases the flow rate of the exhaust gas for the trough truck group in which the pressure in the space covered by the hood has reached the atmospheric pressure or higher. It is preferably configured to control the flow control valve.

(5) In addition, the apparatus according to any one of (1) to (4) above may further include a gas inflow pipe connected to the hood and taking in air into the space covered by the hood. preferable.

(6) Further, in the apparatus described in (5) above, it is preferable that the gas inflow pipe is provided with a check valve that prevents gas from flowing outward from the space covered by the hood. .

(7) In addition, in the above (5) or (6), the inner diameter, the length of the portion inside the hood, and the wall thickness of the gas inflow pipe are each within a predetermined range. is preferred.

According to the present invention, the entire space between the trough truck and the hood can be stably maintained at a negative pressure. Even if a gap occurs between them, it is possible to prevent gas and dust from leaking out of the system from the seal portion between the trough truck side (movable side) and the hood side (fixed side).

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the air supply/exhaustion apparatus of the sinter cooler which concerns on embodiment of this invention. It is explanatory drawing of the other aspect of the air supply/exhaustion apparatus of the sinter cooler which concerns on embodiment of this invention (Modification 1). FIG. 3 is an explanatory diagram of the overall configuration of the air supply/exhaust device of the sintered ore cooler shown in FIG. 2 ; It is explanatory drawing of the other aspect of the air supply/exhaustion apparatus of the sinter cooler which concerns on embodiment of this invention (Modification 2). It is explanatory drawing of the other aspect of the air supply/exhaustion apparatus of the sinter cooler which concerns on embodiment of this invention (Modification 3).

As shown in FIG. 1, the supply/exhaust device 3 of the sinter cooler 1 according to the present embodiment includes a cooling gas pumping device 7 for supplying cooling gas to the lower side of the trough truck 5 and a suction device for sucking the exhaust gas. It is provided with an exhaust gas suction device 9 for discharging the exhaust gas to the outside, and a control device 11 for controlling the flow rate of the cooling gas and the flow rate of the exhaust gas. In this embodiment, it is a DCS (Distributed Control System).
Each device configuration will be described in detail below.

<Sinter cooler>
The sintered ore cooler 1 stacks the sintered ore 15 sintered by the sintering machine on a plurality of trough trucks 5 whose upper part is at least partially covered with a hood 13, and moves the plurality of trough trucks 5. The sintered ore 15 is continuously cooled by passing a cooling gas through the layer of the sintered ore 15 while heating.

The trough carriage 5 comprises wheels 17, a trough 19, an inner side wall 21 and an outer side wall 23, a wind box 25, and a ventilation plate 27, above which the pulverized sintered ore 15 is placed. Laminated.
The trough carriage 5 moves in an annularly partitioned area along rails (not shown) from the ore feeding device side to the ore discharging device side.
A sealing mechanism 28 is provided between the hood 13, which is a fixed body, and the trough carriage 5, which is a movable body, and this portion serves as a sealing portion.

<Cooling gas pumping device>
The cooling gas pumping device 7 has a pumping pipe 29 provided with a cooling gas flow meter F<b>1 for measuring the flow rate of the cooling gas, and is for supplying the cooling gas below the plurality of trough trucks 5 .
A supply blower 8 for pumping and supplying the cooling gas is provided on the upstream side of the pressure-feeding pipe 29, and the downstream side thereof is connected to a fixed-side annular air duct 31 as shown in FIG. 31 is connected to a movable-side annular air duct 35 via a water seal box 33 , and the movable-side annular air duct 35 is connected to the inner side wall 21 via a connecting air duct 37 .

The cooling gas supplied from the pressure feed pipe 29 to the fixed side annular air duct 31 is sealed by the water sealing box 33 and is supplied to the wind box 25 via the movable side annular air duct 35 and the connecting air duct 37 .

A measurement value of the cooling gas flow meter F1 provided in the pressure feed pipe 29 is input to the control device 11 .

<Exhaust gas suction device>
The exhaust gas suction device 9 has an exhaust pipe 41 provided with an exhaust gas flow meter F2 for measuring the flow rate of the exhaust gas, and sucks the exhaust gas from the space covered by the hood 13 and discharges it to the outside. It is. The exhaust pipe 41 is provided with a flow rate control valve 39 for adjusting the flow rate of the exhaust gas.
A discharge blower 10 for sucking and discharging the exhaust gas is provided downstream of the exhaust pipe 41 . A measurement value of the exhaust gas flow meter F2 provided in the exhaust pipe 41 is also input to the control device 11 .

<Control device>
The control device 11 is configured to control the flow control valve 39 so that the flow rate of the cooling gas becomes smaller than the flow rate of the exhaust gas.
Specifically, the measured values of the flowmeters F1 and F2 are input, and based on the measured values, the flow rate of the exhaust gas flowing through the exhaust pipe 41 is adjusted to be greater than the flow rate of the cooling gas supplied from the pressure feed pipe 29. It controls the flow control valve 39 .

When the exhaust gas inside the hood 13 is sucked through a dust collector or the like, the suction force of the exhaust gas is weak in an area distant from the pipes connected to the hood 13, and gas and dust are generated when the pressure inside the hood becomes higher than the atmospheric pressure. Leakage conditions are likely to occur.
Therefore, the control device 11 controls the flow rate adjustment valve 39 so that the flow rate of the cooling gas becomes lower than the flow rate of the exhaust gas, whereby the pressure in the hood can be made lower than the atmospheric pressure.

According to the air supply/exhaust device 3 of the sinter cooler of the present embodiment configured as described above, it is easy to stably maintain the entire space between the trough truck 5 and the hood 13 at a negative pressure. Therefore, even if the side walls 21 and 23 of the trough carriage 5 sink or deform due to aged deterioration, etc., the sealing effect of the sealing mechanism is reduced, and a gap is generated between the trough carriage 5 and the hood 13. It is possible to prevent gas and dust from leaking out of the system from the seal portion between the 5 side (movable side) and the hood 13 side (fixed side).

[Modification 1]
The occurrence or expansion of the gap between the trough truck 5 and the hood 13 due to changes over time may occur randomly with respect to the trough truck 5 .
In this case, as shown in FIGS. 2 and 3, a pressure gauge P for measuring the pressure in the space covered by the hood 13 is provided for each trough carriage 5 or for each trough carriage group consisting of a plurality of trough carriages 5. and a flow control valve 39 are provided, the pressure value, which is the measurement value of the pressure gauge P, is input to the control device 11, and the pressure in the space covered by the hood 13 exceeds the atmospheric pressure (trough truck group) , the flow control valve 39 is adjusted to increase the flow rate of the exhaust gas. This makes it possible to pinpoint leakage prevention and is more economical.
Further, if the total amount of exhaust gas flow collected from each hood 13 does not satisfy the relationship of (total amount of exhaust gas flow)>(cooling gas flow), the pressure difference between the atmospheric pressure and the internal pressure of the hood 13 (atmospheric pressure - It is preferable to increase the opening degree of the exhaust gas flow rate control valve from the one with the smaller hood 13 internal pressure.

[Modification 2]
If the flow rate of the exhaust gas becomes excessive compared to the flow rate of the cooling gas, the pressure difference between the inside of the space covered by the hood 13 and the outside becomes large, which may cause deformation of the sealing portion, intake of outside air, and deformation of the equipment. have a nature. In addition, when the amount of outside air sucked through the seal portion increases, the exhaust heat recovery temperature decreases, hindering heat exchange in the boiler.
Therefore, as shown in FIG. 4, by providing the hood 13 with a gas inflow pipe 43 that takes in air into the space covered by the hood 13, the gas inflow pipe 43 By actively sucking outside air from the hood 13, the pressure difference between the inside and outside of the hood 13 can be reduced, and the inside of the hood 13 can always be maintained in a state close to the atmospheric pressure.

When the gas inflow pipe 43 is provided, the length of the gas inflow pipe 43 over a certain length can be accommodated in the hood 13, so that the external air that has flowed in flows through the gas inflow pipe 43 that is accommodated in the hood 13. It is heated in the process and can suppress the temperature drop of the exhaust gas.
It is desirable that the inner diameter of the gas inflow pipe 43, the length of the portion inside the hood 13, and the wall thickness are each within a predetermined range. : It is desirable to set the dimensions within the range of 0.5m or more and the wall thickness of 5mm or more. If the inner diameter is too small, the pressure loss at the time of inflow into the pipe increases, and if it is too large, the temperature of the exhaust gas may drop momentarily. Also, if the length of the portion inside the hood 13 is short, the inflowing outside air is not sufficiently heated. In addition, by having a certain thickness or more, it is possible to secure heat capacity for storing heat during normal operation when the flow rate of air flowing through the gas inflow pipe 43 is small, and the inflow amount of external air from the gas inflow pipe 43 can be secured. The effect of suppressing the temperature drop in the space covered by the hood 13 when the .DELTA. Note that the upper limits of the length and thickness of the portion of the inflow pipe 43 inside the hood 13 are set to appropriate ranges in consideration of the weight and the like according to the inner diameter of the inflow pipe 43 .
In addition, by installing a check valve 45 or a cyclone (not shown) at the end of the suction side of the gas inflow pipe 43 to prevent the flow of gas from the space covered by the hood toward the outside, the pressure inside the hood 13 is reduced. Gas or dust may be prevented from leaking out of the system even when there is a local fluctuation.

[Modification 3]
The sealing portion at the bottom of the trough truck 5 cannot completely prevent leakage of the cooling gas. In particular, leakage of cooling gas becomes noticeable as equipment deteriorates over time.
Therefore, the minimum value of the exhaust gas flow rate can be reduced by controlling the leakage amount of the cooling gas so that (exhaust gas flow rate)≧(cooling gas flow rate)−(leakage air rate). As a result, the flow rate of the exhaust gas can be reduced, which leads to a reduction in the power cost of the exhaust blower and the like, making it more economical.

The amount of leaked air may be calculated from known data using an arithmetic expression using the cooling gas flow rate, pressure, etc. as variables. Alternatively, as shown in FIG. may be measured, the measured value may be input to the control device 11, and the wind speed may be converted into the amount of leaked air.
In any case, the control device 11 is configured to control the exhaust gas flow rate adjustment valve 39 based on the amount of leakage air so as to satisfy the relationship of (flow rate of exhaust gas)≧(flow rate of cooling gas)−(leakage amount of air). do.

Although the present invention has been described using the embodiments and modifications, the present invention is not limited to the configurations of these embodiments and modifications. The scope of the present invention is determined based on the description of the appended claims. All configurations are included in the present invention.

For example, in the above embodiment, the flow control valve 39 is provided only in the exhaust pipe 41, but the flow control valve may be provided in the pressure feed pipe, or may be provided in both the pressure feed pipe and the exhaust pipe. .

Further, in the above embodiment, the control device 11 is configured to control only the exhaust gas suction device 9 (flow control valve 39), but in the present invention, the control device controls the flow rate of the cooling gas to the exhaust gas. It may be configured to control the cooling gas pumping device so as to be smaller than the gas flow rate, or may be configured to control both the cooling gas pumping device and the exhaust gas suction device.

Further, in the above embodiment, the cooling gas flowmeter is provided in the pressure feed pipe, the exhaust gas flowmeter is provided in the exhaust pipe, and the flow control valve is controlled based on these measured values, thereby performing highly accurate control. Although a preferred mode of implementation has been shown, in the present invention, the control device controls at least one of the supply blower and the discharge blower so that the flow rate of the cooling gas is less than the flow rate of the exhaust gas. may be configured.

1 sintered ore cooler 3 air supply and exhaust device 5 trough truck 7 cooling gas pumping device 8 supply blower 9 exhaust gas suction device 10 discharge blower 11 control device 13 hood 15 sintered ore 17 wheel 19 trough 21 inner side wall 23 outer side wall 25 wind Box 27 Ventilation plate 28 Seal mechanism 29 Pressure feed pipe 31 Fixed side annular air duct 33 Water sealing box 35 Movable side annular air duct 37 Connection air duct 39 Flow control valve 41 Exhaust pipe 43 Gas inflow pipe 45 Check valve 47 Anemometer F1, F2 Flow meter P pressure gauge

Claims (7)

Sintered ore sintered by a sintering machine is stacked on a plurality of trough carriages at least a part of which is covered with a hood, and the sintered ore layer is cooled while moving the plurality of trough carriages. An air supply and exhaust device for a sintered ore cooler that continuously cools the sintered ore by passing gas through it,
a cooling gas pumping device for supplying the cooling gas below the plurality of trough trucks;
an exhaust gas suction device for sucking exhaust gas from the space covered by the hood and discharging it to the outside;
a control device configured to control at least one of the cooling gas pumping device and the exhaust gas suction device such that the flow rate of the cooling gas is smaller than the flow rate of the exhaust gas;
An air supply and exhaust device for a sinter cooler, comprising: The cooling gas pumping device has a pumping pipe provided with a cooling gas flow meter for measuring the flow rate of the cooling gas,
The exhaust gas suction device has an exhaust pipe provided with an exhaust gas flow meter for measuring the flow rate of the exhaust gas,
At least one of the pressure feed pipe and the exhaust pipe is provided with a flow rate adjustment valve,
2. The burner according to claim 1, wherein the control device is configured to control the flow control valve based on the measured value of the cooling gas flow meter and the measured value of the exhaust gas flow meter. Air supply/exhaust system for ore cooler. The control device is configured to control the flow rate adjustment valve based on the amount of leaked air so as to satisfy a relationship of (flow rate of the exhaust gas)≧(flow rate of the cooling gas)−(the amount of leaked air). The air supply/exhaust system for a sinter cooler according to claim 2, characterized in that: A pressure gauge for measuring the pressure in the space covered by the hood and the flow control valve are provided for each trough truck group consisting of at least one of the plurality of trough trucks,
Based on the pressure value obtained from the pressure gauge, the control device increases the flow rate of the exhaust gas for the trough truck group in which the pressure in the space covered by the hood has reached the atmospheric pressure or higher. The air supply/exhaust system for a sinter cooler according to any one of claims 1 to 3, characterized in that it is configured to control the flow control valve. The sinter cooler according to any one of claims 1 to 4, further comprising a gas inflow pipe connected to the hood and taking in air into the space covered by the hood. Air supply and exhaust system. 6. The supply of the sinter cooler according to claim 5, wherein the gas inflow pipe is provided with a check valve that prevents the gas from flowing outward from the space covered with the hood. Exhaust system. 7. The supply of the sinter cooler according to claim 5, wherein the gas inflow pipe has an inner diameter, a length of the portion inside the hood, and a wall thickness, each of which is within a predetermined range. Exhaust system.