JP2009294174A - Gas sampling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cooling tube from being clogged, even when collected sampling gas contains high-concentration dust. <P>SOLUTION: This gas sampling device is a device installed on a furnace wall of a metallurgical furnace, for sampling furnace gas. When being installed on the furnace wall, the device is constituted by integrating in a body: a water cooling probe 1 whose tip part is positioned over the furnace outside from the furnace wall inner surface; a dust collector 2 connected to the base end side positioned out of the furnace of the water cooling probe 1, for removing coarse particulate dust from sampling gas collected from the tip of the water cooling probe 1; and a cooling device 3 arranged on the downstream side of the dust collector 2, for cooling the sampling gas from which the coarse particulate dust is removed. Since the dust collector is arranged on the upstream side of the cooling device, clogging of the cooling tube is not generated, even when the collected gas contains high-concentration dust. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for sampling a high-temperature furnace gas containing a high concentration of dust, which is installed on a furnace wall of a metallurgical furnace such as a blast furnace.

  Gases containing high-concentration dust at high temperatures, such as combustion furnace exhaust gas (hereinafter abbreviated as exhaust gas) and blast furnace furnace gas, sampled by this type of sampling device, are used for component analysis There are many.

  However, because the sampled gas contains high-concentration dust at high temperatures, component analysis cannot be performed in the sampled state, and the gas temperature is lowered by cooling and dust in the gas is removed. There is a need to. For this purpose, it is necessary to install a device for performing sampling gas cooling, dust removal, and the like in advance, and the device itself becomes large.

For example, in order to continuously analyze components such as SO ₂ , NOx, CO ₂ , and CO in combustion exhaust gas discharged from a coal combustion boiler, the dust and soot contained in the combustion exhaust gas collected from the gas sampling unit are collected by a cyclone. Devices for separating and removing are disclosed in Patent Documents 1 and 2.
JP-A-8-254486 JP-A-9-311098

  However, in the metallurgical furnace, there is a case where high temperature gas exceeding 1000 ° C. is sucked as in the lower part of the blast furnace, and in that case, cooling is required to protect the gas sampling part. Therefore, it is difficult to apply the techniques disclosed in Patent Documents 1 and 2 as an apparatus for sampling a furnace gas containing high-temperature and high-concentration dust.

In addition, in a gas component measuring apparatus in a blast furnace, a gas sampling apparatus using a cyclone dust remover is disclosed in Patent Document 3.
Japanese Utility Model Publication 2-95835

  However, since the apparatus disclosed in Patent Document 3 is not provided with a sampling gas cooler, when sampling a high-temperature gas such as a blast furnace gas, the sample gas supply pipe itself reaches the gas temperature. May be damaged by heating. In order to prevent breakage, it is necessary to cool the sample gas supply pipe itself over a long distance, resulting in a larger facility.

In order to solve these problems, the applicant has proposed an apparatus for sampling a gas containing high-temperature and high-concentration dust in a blast furnace in Patent Document 4. This device saves space by making the high-temperature gas sampling unit, the cooler, and the dust remover from the blast furnace into an integrated structure while maintaining the functions of each.
JP 2006-249501 A

  The device proposed in Patent Document 4 cools the gas sampling unit in order to protect it from a high temperature atmosphere, and further includes a cooler that cools the sampling gas itself. And by making these into a compact integrated structure, the collected sampling gas is cooled even in the vicinity of the gas sampling section and can be sent to the gas analyzer at a low temperature, so the gas supply pipe to the gas analyzer is damaged. There is less worry.

  However, even in the apparatus of Patent Document 4, when used at a site where the presence of the melt increases like the lower part of the blast furnace, the dropped molten slag in the furnace that has entered the gas sampling part is rapidly cooled and solidified. There may be a problem that the gas sampling unit is blocked. Further, since the gas sampling unit, the cooler, and the dust remover are arranged in this order, when the collected sampling gas contains high-concentration dust, the spiral cooling pipe may be clogged.

  When the gas sampling unit is clogged or the cooling pipe is clogged, even if the furnace is stopped, there is no way to clean the inside with the equipment attached, and the set of equipment is removed and clogged. There is also a problem of maintainability that must be removed.

The problems to be solved by the present invention are as follows.
(1) Since the cooler is arranged upstream of the dust remover, when the collected sampling gas contains high-concentration dust, the spiral cooling pipe may be clogged. Since the cooler is integral with the main body, it is difficult or impossible to remove the cooling pipe when it is clogged.

(2) Use in a part where there is a lot of melt, such as in the lower part of a blast furnace, the dripped molten slag that has penetrated into the gas sampling part is rapidly cooled and solidified, and the gas sampling part is closed and the sampling gas flow rate is insufficient. It may be impossible. Since the gas sampling section is directly connected to the spiral cooling pipe inside, it is difficult or impossible to remove this blockage when blocked.

The gas sampling device of the present invention comprises:
In order not to clog the cooling pipe even if the collected sampling gas contains high concentration dust,
When installing the metallurgical furnace on the furnace wall, a water-cooled probe whose tip is located from the furnace wall inner surface to the furnace outer side,
A dust remover that is connected to the proximal end located outside the furnace of the water-cooled probe and removes coarse dust from the sampling gas collected from the tip of the water-cooled probe;
A cooling device that is disposed downstream of the dust remover and cools the sampling gas from which the coarse dust has been removed;
The main feature is that it is configured as a single unit.

  In the gas sampling device of the present invention, when the pipe inner diameter of the tip of the water-cooled probe is 20 mm or more, the water-cooled probe can be used even when the molten dripping slag in the furnace that has entered the gas sampling section is solidified. There is no blockage.

  In the gas sampling device of the present invention, when the water-cooled probe is connected to a position on the outer peripheral side from the center in the cross section of the dust remover, a cyclone is generated inside the dust remover and is included in the sampling gas. Coarse grain dust can be efficiently removed.

  Further, in the gas sampling device of the present invention, when the cooling device is provided with a number of cooling tubes made of straight pipes and provided with a removable lid on the side opposite to the dust remover, The inside of the cooler can be cleaned. At that time, it is desirable that the cooling pipe made of a straight pipe can be removed individually and replaced as a single unit.

  In the gas sampling device of the present invention, if a cleaning pipe is provided on the downstream side of the water-cooled probe, the inside of the water-cooled probe can be easily cleaned from the outside of the furnace via the cleaning pipe.

  In the present invention, since the dust remover is arranged on the upstream side of the cooling device, the cooling pipe is not blocked even if the collected gas contains high-concentration dust.

Hereinafter, the best mode for carrying out the present invention will be described in more detail with reference to the accompanying drawings.
In the present invention example, a case will be described in which gas is sampled from the blast furnace at one or several places below the shaft (furnace chest) from the Bosch (morning glory) part, which is the lower part of the blast furnace.

The gas collected from the blast furnace is high temperature (1000 to 1200 ° C.) and high pressure (150 to 400 kPa), and a cooling device is essential for continuous collection.
Therefore, the gas sampling apparatus of the present invention employs an apparatus configuration as shown in FIGS.

  In FIG. 1, reference numeral 1 denotes a probe that is fixedly placed by being inserted into the furnace wall from the outside of the furnace. A central part is a cavity (hereinafter referred to as a central cavity part 1 a), and an outer peripheral part 1 b of the central cavity part 1 a is provided. It is structured to pass water and cool. The material of the probe 1 is not particularly limited, but is preferably made of copper or a copper alloy that can ensure cooling performance.

  The inner diameter of the central cavity portion 1a in the probe 1 is set to, for example, 20 mm or more so as not to block the central cavity portion 1a of the probe 1 even when dripped molten slag in the furnace enters the probe 1 and solidifies. Yes.

  The gas in the furnace (sampling gas) collected from the tip of the probe 1 passes through the central cavity 1 a of the probe 1 and is introduced into the dust remover 2. As the dust remover 2, in the invention example shown in the accompanying drawings, a cyclone type is shown.

  That is, the sampling gas collected from the tip of the probe 1 is introduced not at the center but at the outer peripheral side from the center when viewed horizontally across the dust remover 2 as shown in FIG. By adopting such a configuration, it is possible to efficiently settle and remove coarse dust contained in the sampling gas in combination with a decrease in the gas flow rate.

  The sampling gas after removing the coarse dust is guided to the cooling device 3 arranged on the downstream side of the dust remover 2 to be cooled. In the example of the invention, in consideration of maintainability, the cooling device 3 having a large number of cooling pipes 3a made of straight pipes is provided.

  After the coarse dust has been removed and cooled, the sampling gas is introduced into the gas analyzer after leaving the cooling device 3 and passing through a filter to remove fine dust.

  By the way, in the example of an invention, as shown in FIG. 3, the cover 3b which can be removed is provided in the side opposite to the said dust remover 2 of the cooling device 3. As shown in FIG. With this configuration, by opening the lid 3b, the interior of the multiple cooling pipes 3a can be individually cleaned by the cleaning nozzle 4a as shown in FIG. The cooling device 3 can be replaced as a single unit.

  In the example of the invention, as shown in FIG. 2, a cleaning pipe 5 is also provided at a position facing the connecting portion of the probe 1 in the dust remover 2. In such a configuration, as shown in FIG. 4, the central cavity 1 a of the probe 1 can be cleaned from the outside of the furnace by removing the cover 5 a of the pipe 5 and inserting the cleaning nozzle 4 b.

  5aa is a plug member provided on the lid 5a, and the side of the cleaning pipe 5 connected to the dust remover 2 so that the gas introduced from the probe 1 into the dust remover 2 does not enter the cleaning pipe 5 during sampling. Is to be inserted. In addition, as for the shape of the front end surface of this plug member 5aa, it is desirable to make it the same shape as the internal peripheral surface of the dust remover 2, as shown in FIG.

  Hereinafter, in order to confirm the effect of the present invention, using the sampling device shown in FIG. 1, the obstruction of the cooling pipe 3 a when used continuously for 90 days was confirmed. As a comparison, the obstruction of the cooling pipe was also confirmed when the conventional sampling device proposed by the applicant in Patent Document 4 was used. The results are shown in Table 1 below.

  As shown in Table 1, since dust is removed before cooling in the present invention, unlike the conventional case, there was no clogging of the cooling pipe 3a due to coarse dust during continuous use for 90 days. Further, when the inner diameter of the central cavity 1a of the probe 1 is set to 20 mm or more, it can be confirmed that the probe 1 is not blocked by the intrusion and solidification of the dripping molten slag, and even when the inner diameter of the central cavity 1a is set to 16 mm. Although there was a case where the suction amount decreased due to slight blockage, sampling could be continued stably in any case.

  Moreover, although the solidified slag was confirmed in the probe 1 during the periodical break, it was not closed and could be easily removed by removing the lid 5a.

  As described above, according to the present invention, since the blockage of the probe 1 and the clogging of the cooling pipe 3a can be improved, the time required for maintenance can be shortened, and the measurement frequency can be increased.

  It goes without saying that the present invention is not limited to the above-described best embodiment, and that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.

  The present invention can be applied not only to the range from the Bosch part to the lower part of the shaft, but also when collecting gas by installing in other parts.

It is a side view of the gas sampling device of the present invention. It is AA sectional drawing of FIG. It is a figure of the gas sampling apparatus of this invention. It is the figure which showed the state which open | released the cover provided in the upper part of the cooling device of the gas sampling device of this invention, and is cleaning the inside of the multi-tube straight pipe | tube of a cooling device, and a probe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Probe 1a Central cavity part 2 Dust remover 3 Cooling device 3a Cooling pipe 3b Cover 5 Cleaning piping

Claims (6)

A device that is installed on the furnace wall of a metallurgical furnace and samples the gas in the furnace,
When installed on the furnace wall, a water-cooled probe whose tip is located from the furnace wall inner surface to the furnace outer side,
A dust remover that is connected to the proximal end located outside the furnace of the water-cooled probe and removes coarse dust from the sampling gas collected from the tip of the water-cooled probe;
A cooling device that is disposed downstream of the dust remover and cools the sampling gas from which the coarse dust has been removed;
A gas sampling device characterized in that is configured as a single unit.   The gas sampling apparatus according to claim 1, wherein the water-cooled probe has a tube inner diameter of 20 mm or more at a distal end portion.   The gas sampling apparatus according to claim 1 or 2, wherein the water-cooled probe is connected to a position on the outer peripheral side from the center in the cross section of the dust remover.   The said cooling device is a structure provided with many cooling pipes which consist of a straight pipe | tube, and provided with the lid | cover which can be removed on the opposite side to the said dust remover, The any one of Claims 1-3 characterized by the above-mentioned. The gas sampling device described in 1.   The gas sampling device according to claim 4, wherein the cooling pipe made of the straight pipe can be removed individually and can be replaced alone.   The gas sampling device according to claim 1, further comprising a cleaning pipe on a downstream side of the water-cooled probe.

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