JPS586144B2 - Mitsupushiki Gas Sambling Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for collecting gas and measuring temperature, pressure, etc. in a blast furnace.

In recent years, blast furnaces have become larger and more pressurized, and in order to improve the efficiency of blast furnaces, it is necessary to collect and analyze the gas inside the furnace during operation, and measure the temperature, pressure, gas flow rate, etc. inside the furnace. has become necessary.

Improving gas sampling equipment is becoming increasingly important as feeding back this measurement result to operations allows for effective use of resources (ore, coal, heavy oil barrels) and, ultimately, higher efficiency of the entire blast furnace operation. It is increasing.

Conventionally, gas sampling devices themselves have been used for the purpose of understanding the internal conditions of blast furnaces, although they have been unsatisfactory.

The devices currently in use are single-point (one measuring port) or similar devices, and therefore have many drawbacks and problems.

The shortcomings and problems are summarized as follows.

■Since it is a one-point type, it can only measure one location.

■In sealing equipment, the lance enters the furnace and is subject to wear, scratches, deformation, etc., and gas leaks occur because complete sealing is impossible due to adhesion of dust and adverse conditions such as high temperature and high pressure. It is dangerous.

Furthermore, the sealing device itself is installed close to the furnace body, and has poor heat resistance and durability.

■When measuring several locations in the radial direction inside the furnace, the measurement operation, lance running operation, gas sampling valve switching, limit device switching operations, etc. are required for each measurement location, making it complicated.

Furthermore, the lance itself remains in the raw material in the furnace for a long time, which poses a problem in terms of lance strength (lance load and thermal stress).

■There is a lag in measurement time, and the data is often incomplete.

In other words, the time it takes for the furnace gas to pass through the furnace, which is the object of measurement, is as fast as about several tens of seconds, whereas conventional measurements take about 10 minutes, making it difficult to obtain the necessary instantaneous furnace condition data. I can't get it.

■The operation is complicated and requires skill.

The present invention was made in order to improve the gas sampling device which has the above-mentioned drawbacks and problems.The present invention was made in order to improve the gas sampling device which has the above-mentioned drawbacks and problems. A lance that penetrates the communication portion and enables simultaneous multi-point measurement is slidably inserted into the sealed container in an airtight manner, and a piping that communicates with the end of the lance inside the sealed container is led out of the sealed container. It is characterized by at least the following.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 to 4, a sealed container 1 having nitrogen gas inlets 26 at several locations above and below is fixedly supported on an inspection deck 30 via support legs 31. The rod 3 and the cylinder rod 4a are inserted through the lance 3 and the ends of the cylinder rod 4a are connected to each other, and the lance 3 and the cylinder rod 4a are sealed with the sealed container 1 by the elastic bellows 13 and 14. 3 and the cylinder rod 4a to maintain a sufficient seal against sliding movement.

Further, a guide frame 17 is inserted into the sealed container 1, and the front and rear ends of the guide frame 17 are supported by the inspection deck 30 by the guide frame front and rear supports 18 and 19. One end of the furnace body 6 is connected to the furnace body 6 by a pin 33.

As shown in FIG. 4, the lance 3 does not require machining of the outer surface of the measuring part 3a (the only machining part is the part where the traveling wheel device 20 is attached), and has a compact shape.

That is, the lance 3 is moved by the rod 4 by the operation of the cylinder 4.
A slides against the sealed container in accordance with the expansion and contraction of the lance 3. To facilitate this sliding, a running wheel device 20 is attached to the end of the lance 3 as shown in FIGS. The wheel device 20 runs on a footboard 32 provided at the bottom of the sealed container 1, so that the lance 3 can easily slide.

In addition, this lance 3 can be designed to perform simultaneous multi-point measurement according to the measurement location in the furnace, and the lance 3 has a water circulation cooling pipe 27 as a countermeasure against high temperatures to maintain the strength of the lance 3 itself. I'm starting to get it.

In other words, lance 3 has inspection ports α, β, γ...
It is possible to provide an arbitrary number of ω, and the inspection ports α, β,
Measurement piping α′, which communicates with γ...ω, respectively.
β', γ'...ω are taken out from the end of the lance 3, connected to the piping (hose) 21 as shown in Fig. 2, and finally connected to the piping or wiring outside the sealed container 1. Connect to etc.

In addition, in the figure, 2 is the raw material in the furnace, 5...the center line of the solution,
7... Lance support bush, 9... Connection pipe with lance tip inspection port, 10... Bellows,
15...Cylinder main support bracket, 16...
...Cylinder rear support bracket, 25...
Each safety valve installation port is shown.

The operation of the present invention will be explained in detail based on the above configuration.

Due to the structure having a sealed container 1, a sealing device, which is the most problematic point in conventional devices of this type, is no longer necessary.

This was made possible by connecting the sealed container 1, which can withstand the furnace internal pressure (approximately 3 kg/cm2), to the passage portion of the lance 3.

1 and 2 show a state in which the lance 3 is inserted into the raw material 2 in the furnace.

After completing various measurements (scum sampling, temperature, pressure measurement, etc.) in this state, it is retreated to the stroke A position.

For this retraction, when the cylinder 4 is operated and the rod 4a is retracted, the traveling wheel device 20 runs on the footboard 32 and the lance 3 is pulled out to the outside of the furnace.

When moving the lance 3 to the measurement position again, it is sufficient to move the lance 3 by an operation opposite to the operation of retracting the rod 4a of the cylinder 4, and this repetition is a normal measurement method.

It should be noted that conventional lance 3 was unable to perform simultaneous multi-point measurements mainly due to gas sealing, but in the present invention, the sealed container structure solves the problem of sealing (gas leakage) at the lance part. Multi-point measurement is now possible.

Next, during periodic inspections and in the event of an abnormality, the lance 3 is retreated to stroke B (the maximum stroke of the hydraulic cylinder 4).

This retraction is performed by retracting the rod 4a by operating the cylinder 4 in the same manner as the movement of the stroke A described above.

After retracting the lance 3, the gate valve 8 is closed and the sealed container 1 is closed.
The safety valve 29 or exhaust bypass valve (not shown) is activated to release the gas inside the sealed container, the gas inside the sealed container is exhausted through the exhaust fan connection port 24, and the nitrogen gas is expelled from the nitrogen gas inlet 26. After thoroughly confirming the safety inside the sealed container 1, a worker enters the sealed container 1 through the inspection port 23 and inspects the lance 3, piping (hose) 21, cylinder rod 4a, running wheel device 20, etc. inside the sealed container 1. may be inspected or repaired.

Further, if a large amount of dust has accumulated in the sealed container 1, the dust can be discharged from the dust drain outlet 22.

Further, the tip of the lance 3 is inspected through the lance tip inspection port 9a.

Further, since a dust scraper 12 is provided and a dust chute 11 is provided in front of the dust scraper 12, the dust in the vicinity thereof can be discharged from the dust chute 11.

There is also a dust chute 96 on the bottom of the lance tip inspection port connection pipe.
If there is a lot of dust attached, the dust can be discharged from that location.

As described above, maintenance and inspection of the lance 3 can be easily carried out.

Since the piping (hoses) are gathered together in the sealed container 1, even if gas leaks from the hoses, there will be no leakage outside the machine and there will be no impact on the human body (high safety). Bellows 13 and 14 capable of sufficiently absorbing displacement due to thermal expansion of the furnace body 6 are installed in both ends of the front lance 3 and the rear hydraulic cylinder 4 of the container 1 and in the front and rear ends of the guide frame 17, respectively.

The guide frame 17 is connected to the furnace body 6 by a pin 33, but as a countermeasure against thermal expansion, the pin hole is made into an elongated hole in the vertical direction, and the front and rear supports 1 are used in the horizontal direction.
8.19 both have a link structure, so they can be absorbed sufficiently.

As shown in FIG. 3, if the lance 3 is to be completely replaced as in other embodiments of the sealed container 1, the container 1 itself must be aligned with the axis of the lance 3 and cylinder 4 in advance. It is also possible to create a structure that is divided into upper and lower halves.

Since the sealed waste sampling device of the present invention has the above configuration, it can exhibit the following excellent effects.

(i) A sealing device for the lance (measuring rod) is no longer necessary, and the gas seal inside the furnace is now complete.

(ii) There is no need to machine the outer diameter of the lance, there is no need to worry about wear and damage, and the structure around the lance is simple.

(iii) Simultaneous multi-point measurement becomes possible, and measurement time is also significantly shortened.

(iv) All connections between the inside and outside of the sealed container are fitted with bellows that can tolerate the furnace internal pressure and thermal expansion, resulting in a highly reliable and durable structure.

(V) Even if the piping inside the sealed container were to break, there would be no gas leakage to the outside of the container, making it safe.

(vi) Maintenance such as inspection and repair of the entire lance and the measurement location can be carried out by simply retracting the cylinder by one stroke to its maximum stroke, closing the gate valve, and replacing the gas in the container with gas equivalent to the pressure inside the furnace.

(vii) The overall structure itself is simple and compact.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the sealed gas sampling device of the present invention, Fig. 2 is a longitudinal sectional view of Fig. 1, Fig. 3 is a cross-sectional view taken along the line Figure 4 is an enlarged view of the lance. 1...Sealed container, 3...Lance, 4.
...Cylinder, 4a...Cylinder rod,
6... Furnace body, 11... Dust chute, 13, 14... Bellows, 17...
Guide frame, 20... Traveling wheel device, 21
...Piping (hose), 22...Dust drain outlet, 23...Inspection port, 24...
...Exhaust fan connection port, 25...Safety valve installation port, 26...Nitrogen gas inlet.

Claims (1)

[Claims] 1. A sealed container with multiple inspection holes for inspection is connected to the inside of the furnace and installed outside the furnace, and a lance that penetrates the communication portion and enables simultaneous multi-point measurement is slid into the sealed container in an airtight manner. 1. A sealed gas sampling device, characterized in that a pipe is inserted through the sealed container and communicated with the end of the lance inside the sealed container, and is led out of the sealed container.