JPH07216422A - Device for monitoring furnace hole of blast furnace - Google Patents

Abstract

PURPOSE:To monitor the inner part in a high temp. and high pressure atmosphere of a blast furnace, heating furnace, etc., by an ITV camera. CONSTITUTION:This device is provided with an ITV camera 1, a zoom lens 2, an electric universal head 3, a window glass 4, an ITV camera case 5, an electric gate valve 6, a manhole 7, a motor-operated valve 8 for ringed gaseous nitrogen piping, and a flange 9 for steam-cleaning and nitrogen-purging of the window glass surface. By this constitution, the observing instrument for opening hole of the blast furnace can be housed in the necessary height space in spite of the limitation of the height space at the mantel part for blast furnaces gas collection. Further, the continuous observation can be executed and the window glass 4 is taken off even during the operation of the blast furnace of enable the cleaning and the exchange. Even if the window glass is broken, the blast furnace operation can be continued, and this device contributes to the safe and stable observation of the inner part of the blast furnace for long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a high temperature of a blast furnace or a heating furnace,
The present invention relates to a monitoring device using an ITV camera inside a high-pressure atmosphere.

[0002]

2. Description of the Related Art In a blast furnace, various detectors for collecting in-furnace information have been introduced, including improvement of a charging device for the purpose of stabilizing the furnace condition and operating at a low fuel ratio. With the upper sonde, it has become possible to collect the temperature distribution in the radial direction in the upper part of the furnace, and with the top profilometer, it has become possible to grasp the distribution distribution of the raw materials in the furnace by microwaves. These detection ends detect in-furnace information by indirect physical quantities, and are not means for directly observing the inside of the furnace. A monitoring device using an ITV camera has been developed and used as a means for directly observing the inside of the furnace. A conventional in-furnace monitoring device from the blast furnace throat portion will be described with reference to FIG.

In FIG. 2, 1 is an ITV camera, 2 is a zoom lens, 3 is an electric pan head, 4 is a window glass, 5 is an ITV camera case, 7 is a manhole, 10 is a gate valve, and 11 is an air cylinder. A swing valve is usually adopted as the gate valve 10 and the ITV camera case 5 is water-cooled, and cooling air is circulated inside. The window glass of No. 4 is vapor-purged for the purpose of cleaning stains on the inner surface of the furnace due to dust. The manhole is circumferentially purged with nitrogen in the furnace of the gate valve for the purpose of purging radiant heat and dust from the furnace. In recent years, due to advances in ITV technology, low-illuminance cameras and infrared cameras have been adopted as ITV cameras from industrial ITVs.

[0004]

In the conventional in-reactor monitoring device, the mounting height of the blast furnace gas collecting mantel part is limited. It is difficult to continuously observe inside the reactor. When the window glass is contaminated over time and the window glass is to be cleaned or replaced, the gate valve must be shut down and the ITV camera case must be removed because the sluice valve is insufficiently sealed. Since the pressure inside the furnace is high when the window glass is broken, high-temperature and high-pressure blast furnace gas passes through the ITV camera case and is jetted out of the furnace, which causes a problem that operation of the blast furnace is suspended.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an electric sluice valve provided on the front side of the furnace of a blast furnace furnace mouth monitoring window, and a manhole for observing the inside of the furnace for electric sluice valve body purging. A ring-shaped nitrogen gas pipe, a monitoring window that allows steam cleaning and nitrogen purging, and the heat-resistant glass can be replaced from the outside of the furnace.When observing the inside of the furnace, the electric shut-off valve nitrogen purge and the monitoring window nitrogen purge are synchronized and purged. And to provide a blast-furnace throat monitoring device characterized by being configured by a pressure-resistant ITV camera case having a cooling function.

[0006]

Operation and Embodiments Embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 is an ITV camera, 2 is a zoom lens, 3 is an electric pan head, 4 is a window glass having a heat-resistant specification of 800 ° C., 5 is an ITV camera case, 6 is an electric gate valve, 7 is a manhole, Reference numeral 8 is a ring-shaped nitrogen gas piping motor-operated valve for purging the electric gate valve, and 9 is a flange for steam cleaning of the window glass surface and nitrogen purging. In the present invention, the installation height space in the blast furnace gas collection mantel part is restricted, but by adopting a heat-resistant electric sluice valve from the swing valve, it is possible to store and install in the required height space. There is. Next, blast furnace pressure 2.5
For blast furnace operating conditions of ~ 3.0 kg / cm ² and furnace top gas temperature of 350 ° C, the window glass has a heat resistance strength specification of 800 ° C, and in order to purge radiant heat and dust from the furnace, A ring-shaped nitrogen gas pipe is installed inside the electric sluice valve, and high-pressure nitrogen gas with a pressure of about 7.0 kg / cm ² is blown in to purge the electric sluice valve by the curtain effect of nitrogen gas. At the time of internal observation, nitrogen purge on the window glass surface is performed simultaneously to enable continuous observation.

Next, conventionally, the window glass has been attached to a flange capable of vapor cleaning and nitrogen purging, and the flange itself has been attached so as to be sandwiched between the gate valve and the ITV camera case. Although it is cleaned with steam and purged with nitrogen as it is used for a long time, the glass surface will inevitably become soiled over the years. Therefore, when cleaning or replacing the window glass, it was necessary to stop the operation of the blast furnace and remove the ITV camera case due to insufficient sealing of the sluice valve.

In the present invention, the flange for steam cleaning and nitrogen purging can be connected to the ITV camera case with a flange structure, and the window glass is attached inside the ITV camera case. Therefore, even when the blast furnace is in operation, the window glass can be removed and cleaned or replaced by closing the electric sluice valve. On the other hand, window glass has been adopted with due consideration of heat resistance specifications and mechanical strength, but since the ITV camera case of ordinary structure has been used in the past, the pressure inside the furnace is high when the window glass is broken, so high temperature and high pressure There was a risk that the blast furnace gas of No. 1 would pass through the ITV camera case and be ejected outside the furnace, causing troubles in the operation of the blast furnace. The present invention provides a means for continuing the operation of the blast furnace even if the window glass is damaged. That is, by adopting a pressure resistant ITV camera case with a cooling function for the blast furnace furnace mouth monitoring device, even if the window glass is damaged, the pressure resistant sealing structure of the ITV camera case seals the gas in the furnace and continues the blast furnace operation. It has become possible to squeeze.

[0009]

As described in detail above, according to the method of the present invention, the blast furnace monitoring device is housed within the required height space against the mounting height space limitation in the blast furnace gas collection mantel part. It enables installation and continuous observation, and allows the window glass to be removed for cleaning and replacement even during operation of the blast furnace, providing a means to continue blast furnace operation even if the window glass should be damaged. Will contribute to stable long-term stable blast furnace observations.

[Brief description of drawings]

FIG. 1 is an explanatory view of an apparatus embodying the present invention.

FIG. 2 is an explanatory view of a conventional in-furnace monitoring device from the mouth of a blast furnace.

[Explanation of symbols]

1 ITV camera 2 Zoom lens 3 Electric pan head 4 Window glass 5 ITV camera case 6 Electric sluice valve 7 Manhole 8 Electric sluice valve Ring-shaped nitrogen gas pipe electric valve for purging 9 For window glass surface vapor cleaning and nitrogen purging Flange 10 Gate valve (swing valve) 11 Air cylinder

Claims (1)

[Claims] 1. A blast furnace mouth monitoring device comprising an in-furnace monitoring manhole and a monitoring window at the top of the blast furnace, a sluice valve for partitioning between them and a monitoring window, a purge pipe, and an ITV camera case having a cooling function. An electric sluice valve provided on the front side of the monitoring window inside the furnace, a ring-shaped nitrogen gas pipe provided in a manhole for monitoring the inside of the furnace for electric sluice valve body purging, steam cleaning and nitrogen purging, and heat-resistant glass from outside the furnace Replaceable monitoring window and pressure resistant ITV with cooling function
A blast furnace throat monitoring device comprising a camera case.