JPS605874B2 - Metallurgical furnace sampling device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sampling device for a metallurgical furnace.
The present invention relates to a sampling device for a metallurgical furnace that can sample a necessary amount of solid particles from a metallurgical furnace such as a fluidized bed reactor without bringing the gas inside the furnace outside the furnace.

Generally, the inside of a metallurgical furnace such as a fluidized bed reactor is maintained at a high temperature and in a reducing atmosphere, so when sampling solid particles from the sampling tube of the reactor in order to understand the reaction situation inside the reactor, it is difficult to collect the solid particles. It is necessary to cool the solid particles in the middle of the tube and take them out, and at this time to prevent the reducing gas inside the furnace from leaking to the outside.

The solid particles are normally cooled in a cooling chamber within the collection tube, and two valves are provided at the bottom of the cooling chamber, and the solid particles are discharged after cooling by opening and closing these valves. For example, of the two valves, the upper valve is opened to introduce solid particles, and then the upper valve is closed and at the same time the lower valve is opened to take out the solid particles. However, if these valves are opened and closed several times, the inside of the valves will wear out due to the action of powder, and even if the valves are closed, reducing gas will leak to the outside from the lower valves. Therefore, in order to prevent the reducing gas from leaking to the outside, high-pressure inert gas is introduced inside the valve.
A type of device in which this inert gas is discharged and flowed into the furnace has also been proposed. In this device, inert gas in the furnace gas and furnace top gas increases, which is not favorable for operation. Another example of such a sealing method is a leveling device for a blast furnace, but in a blast furnace, it is sufficient to intermittently repeat pressurization and pressure, and the flow rate and pressure of the inert gas fluctuate, so this device cannot be used as is as a sealing method for a fluidized bed reactor.
The present invention aims to solve the above-mentioned drawbacks, and specifically, a cooling chamber and an inert gas chamber are formed in the discharge pipe connected to the sample discharge port of a metallurgical furnace. We propose a sampling device that can flow inert gas and sample solid particles without bringing in the furnace gas from the metallurgical furnace.

That is, the present invention provides a cooling chamber connected to a sample outlet of a metallurgical furnace such as a fluidized bed reactor, and a cooling chamber for cooling a required amount of sample taken from the fluidized bed reactor, etc., and a flow of inert gas. A sample discharge pipe in which an inert gas chamber having an inlet and an outlet is formed, and pressure regulating means for adjusting the pressure in the inert gas chamber of the sample discharge pipe to be always higher than the gas pressure in the fluidized bed reactor. It is characterized by being provided with.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, FIG. 1 is a vertical cross-sectional view of a fluidized bed reactor for iron ore, etc., and FIG. 2 is a vertical cross-sectional view of a sampling device according to one embodiment of the present invention. A perforated plate 3 is provided inside the reactor generally shown in FIG.

Fluidizing gas is supplied from the inlet 7 at the bottom, flows upward in the furnace, and is discharged from the top gas pipe 8. During this time, iron ore and coal are fluidized by the fluidizing gas, and the iron ore is reduced. The reduced iron is discharged as a product from the reactor 1 through the screw feeder 5 and stored in the hopper 6.
Note that a discharge pipe 4b is provided at the lower part of the reactor 1 so that reduced iron as a product can be sampled, and the properties of the product can be inspected. Next, in order to know the reduction state of iron ore, etc. in the reactor 1 having the above configuration, an outlet 4 is placed approximately in the center.
solid particles of the reaction product are extracted from the outlet 4a, and a sampling outlet pipe 9 is connected to the outlet 4a as shown in FIG.

A cooling chamber 10 and an inert gas chamber 11 are formed in this discharge pipe 9, and a valve 12a is interposed between the cooling chamber 10 and the inert gas chamber 11, while a valve 12b is provided at the tip of the inert gas chamber 11. Install. This cooling chamber 10 can be configured in any way as long as the solid particles sampled from inside the reactor 1 can be cooled, but it is usually a double structure, with an annular chamber 10 between the inner and outer cylinders.
It is sufficient if the cooling water is arranged horizontally so that the cooling water flows through a. Further, the inert gas chamber 11 is configured such that an inert gas is introduced from an inlet 11a and can be discharged from the discharge roll 1b.Furthermore, in order to maintain this inert gas higher than the pressure inside the reactor 1, for example, , a pressure regulating means 13 such as a pressure regulating valve is provided. When the discharge pipe is configured in this manner and the pressure of the inert gas flowing in the inert gas chamber 11 is maintained at a pressure higher than the furnace gas pressure by the pressure regulating means 13, solid particles are removed from the furnace by the furnace gas. can be sampled without leaking information. That is, since the cooling chamber 10 is formed in the discharge pipe near the reactor, the sampled solid particles are first cooled there. In this case, two valves 12
a, 12b are closed, and valve 12a is opened when the solid particles have finished cooling. In this way, the solid particles enter the inert gas chamber 11, at which time the valve 12a is closed, while the valve 12b is opened and the solid particles are removed from the container 141.
Inert gas is introduced into the inert gas chamber 11 from the inlet 11a and is discharged from the outlet 11b, and the pressure P2 of the inert gas is controlled by the pressure adjusting means 13 to the furnace gas pressure, especially the exhaust pipe outlet. The nearby pressure P is adjusted to be larger. Therefore, the gas in the furnace is sealed off by this high-pressure inert gas and does not leak. In this case, P,,
It is preferable to adjust the difference in P2 so that it falls within the range of PL<P2-P, Pu. In this case, the lower limit PL is preferably as small as possible within a non-negative range, and generally it is preferably about 1 QO or more. If the upper limit of Pu is too large, the amount of inert gas required will increase, and it is better to be smaller as long as it does not affect the operation, but in general, it is preferably 500 days or less. In short, by controlling the inert gas pressure in this way, even if the pressure inside the reactor fluctuates, the inert gas pressure can always be kept higher than the reducing gas pressure.
Furthermore, by controlling the pressure, the amount of inert gas consumed can be kept low. In addition, when the two valves 12a and 12b are repeatedly opened and closed during sampling, the gas in the valves may be caused by entrapment or abrasion of solid particles, or by thermal action of solid particles that are insufficiently cooled from above. The seal tends to be incomplete. In other words, the furnace gas easily leaks to the outside through the valves 12a and 12b which do not have sealing properties, and the furnace gas contains CO and carbon dioxide, which is harmful and explosive and extremely dangerous. In this case, inert gas chamber 1
If only the inlet port 11a is attached to 1 and the discharge row lb is not attached, the inert gas can prevent the gas inside the furnace from going outside, but a considerable amount of inert gas will still enter the furnace. Therefore, particles in the fluidized bed are likely to fly out and the pressure in the exhaust gas pipe increases due to an increase in inert gas in the furnace gas or an increase in the amount of furnace gas. but,
In the present invention, since the cooling chamber 11 is provided with the inlet port 11a and the outlet port 11b, the inert gas that enters through the inlet port 11a exits through the outlet port 11b, so this problem does not occur. In addition to the inert gas, in the reactor 1, the top gas is circulated and blown in from the inlet 7 at the bottom, so a decarboxylation device is installed in the middle of the top gas circulation path to remove CO2. , the removed CO2 can also be used instead of an inert gas. Furthermore, the flow direction of the inert gas can be either cocurrent or countercurrent with respect to the moving direction of the solid particles, but countercurrent is preferred in order to reduce the flow of gas leaking from the valve 12b into the furnace. is desirable. The flow rate of the inert gas should be at least 5 to 1 pep of the furnace gas leaking from the valve 12a. Furthermore, the amount of inert gas can be adjusted depending on the amount of gas leaking into the furnace by occasionally analyzing the gas at the exhaust port 11b. In addition, if the inlet 11a is installed at the bottom of the inert gas chamber 11, the solid particles will flow into the inlet roll la.
Since it is easy to get inside, it is preferable to attach a wire mesh 11c there.

Further, this inlet 11a is connected to the upper part 11 of the inert gas chamber 11.
d, and there is no need to attach a wire mesh in this case. In addition, the volume of the inert gas chamber 11, that is, 2
It is sufficient that the length between the two valves 12a and 12b is the same as that of the cooling chamber 10, and the length of the cooling chamber 10 may be determined depending on the amount of solid particles required for sampling.

In addition, the sampling device having the above configuration includes, for example, M.
By connecting an analyzer such as an Fe analyzer, required components can be automatically separated from the solid particles after sampling.

That is, FIG. 3 is a layout diagram of an example in which a fractionating device is connected, and in this case, instead of the container 14,
An M.Fe meter 15 is connected as an analyzer.

This M.Fe meter has an oscillation circuit 15a and a coil section 15b.
and a frequency counter 5c, the sampled solid particles open the valve 12b and pass through the cell 1 with a certain volume.
Fill to 6d. The outside of this cell 15d is the coil portion 15.
The coil part 15 consists of b, and the coil part 15 at the time of filling and when blanking.
Since the difference in frequency b is proportional to the reduction rate of the solid particles, the reduction rate of the solid particles can be determined by measuring this frequency with the counter 15c. After measurement, solid particles are removed from valve 1.
6 is opened and collected into a container 14a. As explained in detail above, the present invention is connected to the sample outlet of a metallurgical furnace,
Moreover, it is equipped with a cooling chamber for cooling the required amount of sample taken from the metallurgical furnace, and a sample discharge port in which an inert gas chamber having an inlet and an outlet for inert gas is formed. A pressure means is provided for adjusting the pressure in the active gas chamber to always be higher than the gas pressure in the metallurgical furnace.

Therefore, inert gas passes through some of the sampled solid particles, and the pressure of the inert gas is regulated. leakage can be prevented.

Furthermore, the present invention is generally applicable to powder and granular equipment that handles solid particles other than these.

[Brief explanation of the drawing]

0 Fig. 1 is a longitudinal sectional view of a fluidized bed reactor for iron ore, etc., Fig. 2 is a longitudinal sectional view of a sampling device according to one embodiment of the present invention, and Fig. 3 is a longitudinal sectional view of a sampling device according to an embodiment of the present invention. FIG. Code 1...Reactor, 2...Iron ore supply device, 3
5...Perforated plate, 4a...Discharge port, 4b...
...Exhaust pipe, 5...Skuriyuida, 6...Hotsupa,
7... Inflow port, 8... Furnace gas pipe, 9...
Sampling discharge pipe, 10...Cooling chamber, 10a...
...Annular chamber, 11...Inert gas chamber, 11a, 11
c... Inflow 0 port, 11b... Outlet, 11d... Wire mesh,
12a, 12b...Valve, 13...Pressure adjustment means, 14,
14a... Container, 15... M・Fe meter, 1
5a...Oscillation circuit, 15b...Coil part, 15
c...Frequency counter, 15d...Cell, 16...Ta valve, P. ...Inert gas pressure, P2...
・Furnace gas pressure. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A sample that is connected to the sample outlet of a metallurgical furnace and has an inert gas chamber that has a cooling chamber for cooling the required amount of sample taken from the metallurgical furnace and an inert gas inlet and outlet. 1. A sampling device for a metallurgical furnace, comprising a discharge pipe, and pressure adjusting means for adjusting the pressure in the inert gas chamber of the sample discharge pipe to always be higher than the gas pressure in the metallurgical furnace.