JPS6059509B2 - Sonde for measurement inside high temperature furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sonde for measuring inside a high-temperature furnace, and particularly to a sonde for measuring inside a high-temperature furnace such as a blast furnace, which has a simple structure and has a cooling function that sufficiently maintains the strength of the lance.

Normally, the operation of high-temperature furnaces such as blast furnaces is controlled by measuring the internal conditions of the furnace, and one method for this is to use a sonde.

A sonde is a device that inserts a lance into a high-temperature furnace and measures the temperature inside the furnace, gas composition, gas pressure, etc. However, since a sonde is used in a high-temperature furnace, the lance must be cooled by some kind of cooling method. Since the strength cannot be maintained, water-cooled or air-cooled cooling methods are used. For example, water-cooled cooling methods include a triple pipe for the outgoing cooling water and a sample gas conduit as shown in Figure 1. There is a structure consisting of

That is, in the sonde main body 1, furnace gas is introduced from a gas sampling tube 3 at the tip of a sample gas conduit with a thermocouple 4 installed in the center, and a pressure impulse tube outlet 11 is connected to these measuring instruments (not shown). By doing this, gas composition and gas pressure can be measured. Also, the cooling water enters from the inlet 10,
The water flows around the tip of the sonde and is discharged from the drain port 12. Therefore, since this type of structure requires two waterways, one for the outbound route and one for the return route, it must be composed of double pipes, and the structure is complicated, and it is extremely difficult to miniaturize it as it is. It was difficult.

In addition, the air-cooled type uses only gas as the purge gas without water cooling, but as shown in Figure 2, it is similar to the water-cooled type in that it has a thermocouple 4 and a gas sample conduit in the center. However, the structure is simple because the purge gas is supplied from the purge gas inlet 9 and discharged to the cooling gas outlet 2 near the tip of the sonde, but the cooling capacity is insufficient and the durability of the sonde is significantly reduced. Unfortunately, in order to improve its durability, it is necessary to increase the cooling capacity, but in this case, to increase the cooling capacity, a large amount of purge gas must be supplied, and as a result, a large amount of purge gas is forced into the furnace. This makes it difficult to accurately sample the gas inside the furnace. The present invention aims to solve these drawbacks, and includes an inner pipe for collecting furnace gas,
The purge gas supply part and the cooling water supply part are supplied to the space between the inner pipe and the outer pipe through separate paths (flow paths), and the purge gas supply part is the cooling water supply part. By installing the same or more at the rear end of the sonde, atomizing the cooling water inside the sonde, and installing the mist and purge gas outlet near the tip of the sonde at a position that does not affect the gas in the furnace. The object of the present invention is to provide a sonde for measuring inside a high-temperature furnace such as a blast furnace, which has a simple lance structure and has a cooling function sufficient to maintain the strength of the lance.

That is, the present invention consists of an inner tube that has one end connected to the inside of the furnace and the other end that is connected to a detection device outside the furnace to define an outlet path for the furnace gas used, and an outer tube that houses the inner tube. In a sonde for measuring inside a high-temperature furnace in which a cooling medium flows through a space between an inner tube and an outer tube, a carrier gas supply section is provided at a portion outside the furnace in the space, and the furnace is located at the same level as the carrier gas supply section or at a temperature higher than that of the carrier gas supply section. In the cooling water supply part with a spray nozzle on the inner part and in the outer pipe near the tip of the sonde and in a part that does not affect the furnace condition measurement means,
Cooling water from the cooling water supply section is added to the carrier gas in the form of a mist, and an opening is provided through which the atomized air flow flowing through the space is discharged into the furnace. The present invention will be further explained in detail below with reference to the drawings.

The drawings show embodiments of the present invention, and FIGS. 3, 4, 5, 6, and 7 show embodiments of the present invention, and FIG. Example cross-sectional view, Figure 4 is the 3rd
Figure 5 is a diagram of the relationship between the amount of cooling water and thermal damage at the tip of the sonde using the device shown in Figure 3. FIGS. 6 and 7 are enlarged sectional views of mist forming parts of other embodiments, respectively.

In addition, in FIG. 5, FIG. 6, and FIG. 7, a and b, respectively, are vertical and horizontal sectional views. The code 1 is the sonde body, and 2 is the cooling gas. Outlet, 3 is a gas sampler, 4 is a thermocouple, 5 is a pressure impulse tube, 6 is a gas analyzer, 7 is a gas pressure gauge, 8 is a cooling water injection nozzle, 9 is a purge gas inlet, 10 is a cooling water inlet, 11 is a pressure pipe outlet, 12 is a drain port, 13 is a purge gas throttle part, 14 is a water passage, 15
1 is a water supply vibrator, 16 is an atomizing nozzle, 17 is a water pipe, 1
8 represents a gas blowing pipe. The present invention utilizes the principle that water generally evaporates at a temperature of approximately 100°C and removes a large amount of heat during evaporation, but simply adding water does not provide uniform and good cooling. Therefore, when water is sprayed into the gas inside the sonde, it is possible to fully exhibit the effect that the greatest cooling capacity and uniform cooling can be obtained when the water is made into a mist.

First, as shown in FIG. 3, the sonde of the present invention includes a sonde main body 1 consisting of one vibrator, a gas sampler 3 and a thermocouple 4 provided at the tip thereof.
The cooling gas outlet 2 is located at a position that does not affect sampling of the gas in the furnace, and the purge gas throttle part 13 is arranged so that when the purge gas is introduced into the sonde from the purge gas inlet 9, the velocity of the purge gas increases. It is provided.

On the other hand, cooling water is supplied from a cooling water inlet 10 and then jetted into the sonde from a small diameter cooling water injection nozzle 8. Here, this cooling water is atomized by a high-speed purge gas, and as it travels inside the sonde, it cools its inner tube and outer tube. During this time, the atomized water turns into steam and is discharged into the furnace from the cooling gas outlet 2 together with the purge gas. Incidentally, the measurement of the temperature inside the furnace and gas sampling can be performed in the same manner as in the conventional method, and can be measured using existing instruments. Next, as a specific example, the outer diameter is 42.7T.
fr! The cooling capacity was measured using a sonde having the structure shown in FIG.

The results are shown in FIG. In this case, since the required amount of cooling is proportional to the outer surface area of the sonde, the amount of cooling water is expressed in units of Kg/Hr based on the outer surface area. From this point of view, although the variation is relatively large, it is clear that sufficient cooling can be achieved by increasing the amount of cooling water. It is presumed that the cause of this variation is not due to variation in cooling capacity, but rather due to changes in temperature conditions within the furnace. Next, FIG. 5 shows the mist forming section in FIG. Carry it toward the tip of the sonde.

This cooling method is characterized by introducing gas and liquid into the sonde through separate paths, atomizing them within the sonde, and transporting the droplets toward the tip of the sonde using the introduced gas. However, it is not necessarily necessary to use the method shown in FIG. 3 or FIG. 5, and other methods may be used. For example, in FIG. 6, purge gas is supplied into the sonde in the same way as in FIG. The resulting droplets are transported toward the tip of the sonde by the gas flow.

Further, FIG. 7 shows that the liquid is atomized by introducing gas into the sonde at high speed through the blowing pipe 18 and adding the liquid sent through the water conduit 17 at the tip of the blowing pipe into the sonde through the nozzle 8. .

In Figure 3, the mist generating part is located near the rear end of the sonde, but since the only part of a sonde that normally requires cooling is the tip inserted into the furnace, the mist generating part is located closer to the tip of the sonde. It's okay to move to. As explained above, the present invention provides (1) supplying purge gas and cooling water to the sonde through separate paths in a high-temperature reactor measurement sonde with a water-cooled double pipe structure, and (2) atomization. (3) A section for supplying purge gas into the sonde must be provided at the rear end of the sonde at the same level as the cooling water supply section, and (4) Mist and purge gas must be disposed of at or near the tip of the sonde. By providing an outlet, this sonde has a simple structure, has a cooling function that sufficiently maintains the strength of the lance, and is an excellent sonde for measuring inside high-temperature furnaces that can obtain accurate samples.

[Brief explanation of drawings]

Figures 1 and 2 are sectional views of the conventional example, Figures 3 and 4.
5, 6 and 7 show examples of the present invention, FIG. 3 is a sectional view of the example, and FIG. FIG. 5 is a diagram showing the relationship between the mist forming portion and the temperature of the mist forming portion, and FIG. 5 is FIG. 3, and FIG. 6 and FIG. Code, 1...Sonde body, 2...Cooling gas outlet, 3...Gas sampling hole, 4.
...Thermocouple, 5... Impulse tube, 6...
...Gas analyzer, 7...Gas pressure gauge, 8...
...Cooling water blowing nozzle, 9...Purge gas inlet, 10...Cooling water inlet, 11...
Impulse pipe outlet, 12... Drain port, 13...
Purge gas throttle part, 14... Water channel, 15...
...Water supply vibrator, 16...Atomization nozzle, 17.
... Water pipe, 18 ... Gas blowing pipe.

Claims (1)

[Claims] 1 Consists of an inner tube that has one end connected to the inside of the furnace and the other end that is connected to a detection device outside the furnace to define an outlet path for the furnace gas used, and an outer tube that houses the inner tube, and the inner tube and the outer tube. In a high-temperature furnace in-furnace measurement sonde in which a cooling medium flows through a space between the space, a carrier gas supply section is provided at the outer side of the furnace in the space, and a spray nozzle is provided at the same or inner side than the carrier gas supply section. The cooling water from the cooling water supply section is added in the form of a mist to the carrier gas in the cooling water supply section and the outer tube in the vicinity of the sonde tip and in a part that does not affect the reactor condition measuring means. A sonde for measuring the inside of a high-temperature furnace, which has an opening that releases the flowing spray air into the furnace.