JPH0126750Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is intended for use in smoke exhaust and
This invention relates to a dust collection device for a converter building that collects dust efficiently and at low cost.

[Conventional technology]

Conventionally, a smoke and dust collection device for a converter building generally has a structure as shown in FIG. That is, the converter building consists of a converter building 2 in which a plurality of converters 1 are installed and a raw material charging building 4 in which a plurality of hot metal charging pots 3 are installed. When charging the
The plume containing a large amount of dust blown out from the converter 1 is captured by the furnace front ventilation hood 5, discharged via the furnace front ventilation main duct 6, and sent to a dust collector (not shown) such as a bag filter. The plume that cannot be captured by the front ventilation hood 5 is discharged to the outside of the building by raising a ventilation flue 7 provided at the upper part of the material charging building 4. 8 is converter exhaust gas treatment equipment, 1
0 is a partition wall, 11 is a monitor, and 12 is a furnace ventilation damper.

In addition, we have installed a dust collector on top of the converter building (indicated by the broken line in Figure 3) to cover all the ventilation in the building, and a monitor installed on top of the converter building. A so-called building dust collector, which is a device that is equipped with a monitor hood having a damper to process all of the ventilation inside a building, is known.

[Problem that the invention attempts to solve]

However, the apparatus shown in FIG. 3 above has problems in that it requires a large-capacity dust collector and is low in efficiency since it targets the entire amount of ventilation within the converter building. In addition, the above-mentioned device in which the dust collector 17 is installed on top of the converter building has the problem of the device shown in Figure 3, and since the dust collector is mounted on the building, the building It has the problem of becoming larger. In addition, the above-mentioned device that installs a monitor hood on the top of the converter building closes the monitor and collects the exhaust smoke, so it requires a capacity comparable to the amount of natural ventilation, and the monitor is used as a hood. ,
The problem is that it needs to be kept running all the time.

This invention was made to solve the above problems, and has a flue damper installed in the ventilation flue installed in the upper part of the converter building, and a smoke exhaust damper located slightly below the flue damper. By connecting the smoke exhaust duct through a short duct, the smoke rising inside the building is captured by operating both dampers, and most of it is exhausted, allowing the smoke to flow out of the building at low cost. The object of the present invention is to provide a dust collection device for a converter building that can prevent the above.

[Means for solving problems]

The dust collection device for a converter building according to the present invention will be described with reference to FIGS. 1 and 2, and will be described with reference to FIGS. In the converter building consisting of the installed raw material charging building 4, when hot metal is charged into the converter 1, the plume blown out from the converter is captured by the furnace front ventilation hood 5 and passed through the furnace front ventilation main duct 6. The ventilation flue 7 provided at the upper part of the raw material charging building is raised to discharge the plume that could not be captured by the ventilation hood 5 to the outside of the building. A flue damper 13 is provided in the flue 7, and a smoke exhaust duct 16 is connected slightly below the flue damper 13 via a short duct 15 having a smoke exhaust damper 14.

[Effect]

Smoke is removed by operating only the damper in the smoke generating area, and natural ventilation is provided in other areas. That is, when charging hot metal, the damper 13 is closed and the damper 14 is opened to collect exhaust smoke. Further, during blowing, natural ventilation is performed by opening the damper 13 to half-open and closing the damper 14 to half-open.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is an explanatory elevational view of the dust collection device for a converter building of the present invention, and FIG. 2 is an explanatory cross-sectional view taken along the line A--A in FIG. 1.

The device shown in FIG. 1 is the same as the device shown in FIG.
This configuration is such that a smoke exhaust duct 16 is connected via a short duct 15 having a smoke exhaust damper 14. 18 is the outer wall of the building.

In the apparatus of the present invention configured as described above, the dampers 12 and 14 are opened and the flue damper 13 is closed at the start of molten metal charging. The smoke blown out from the converter 1 is collected by the hood 5, and the smoke that is not captured and rises up the ventilation flue 7 is removed from the roof and flue of the material charging building 4 because the damper 13 is closed. It acts like a large hood and collects smoke. At this time, the damper 14 is opened and the smoke is exhausted via the smoke exhaust duct 16. Smoke from the furnace mouth is prevented from flowing into the converter building 2 by the partition wall 10.

During blowing, the exhaust gas coming out of the converter 1 is treated by the exhaust gas treatment equipment 8. The gas at this time is CO
It contains approximately 70 to 80% of smoke, which is completely different in amount and composition from the smoke during charging of hot metal. However, depending on the blowing conditions, gas often blows out from the gap between the converter 1 and the gas processing equipment 8, so the damper 1
2 is left half open, and the blown smoke is captured by the hood 5 and discharged through the furnace front ventilation main duct 6. However, when the amount of blowout is large, the damper 14 is opened to capture and exhaust the smoke that could not be captured by the hood 5. Note that gas is usually blown out when
This phenomenon occurs during the middle and later stages of blowing, and is mainly observed when iron ore is charged into the converter 1, so it is predictable and can be adequately handled by opening and closing the damper 14.

[Effect of idea]

Since the dust collection device for a converter building of the present invention is configured as described above, it has the following effects.

(1) Since the ventilation flue is used as a hood, smoke can be efficiently removed.

(2) The amount of smoke absorbed by the smoke exhaust duct can be adjusted by combining the operation of the flue damper and the smoke exhaust damper. In other words, it is inconspicuous (below the regulation value).
By considering exhausting smoke from the monitor, the overall capacity can be reduced. According to experiments conducted by the present inventor, by providing and adjusting a flue damper and a smoke exhaust damper, the processing air volume was increased by about 10 to 25% compared to the case where both dampers were not provided.

(3) Smoke can be removed by operating only the flue damper in the smoke generating area, allowing natural ventilation to be used in other areas. Therefore, the capacity can be reduced.

(4) When there is no smoke, it is possible to use only natural ventilation, and converter buildings where no smoke is generated can be left with natural ventilation.

(5) By separating buildings with equipment that can generate smoke with partitions, dampers can be installed only in the relevant buildings.

[Brief explanation of drawings]

Fig. 1 is an elevational explanatory view showing an example of a dust collection device for a converter building of the present invention, and Fig. 2 is an A--A in Fig. 1.
3 is an explanatory elevational view showing an example of a conventional dust collection device for a converter building. 1... Converter, 2... Converter building, 3... Hot metal charging pot, 4... Raw material charging building, 5... Furnace ventilation hood,
6... Furnace ventilation main duct, 7... Ventilation flue,
8...Converter exhaust gas treatment equipment, 10...Partition wall, 1
1...Monitor, 12...Furnace ventilation damper, 13
... Flue damper, 14 ... Smoke exhaust damper, 15 ...
Short duct, 16...Smoke exhaust duct, 17...Dust collector for collecting dust from the building, 18...Outer wall of the building.

Claims (1)

[Scope of utility model registration request] Inside the converter building, which consists of a converter building with multiple converters installed and a material charging building with multiple pig iron charging pots, the smoke blowing out from the converter is The fume that could not be captured by the furnace front ventilation hood is captured by the furnace front ventilation hood and discharged via the furnace front ventilation main duct. In a device configured to discharge outside the building, a flue damper is provided in the ventilation flue, and a smoke exhaust duct is connected via a short duct having a smoke exhaust damper slightly below the flue damper. Features: Dust collection equipment for converter buildings.