JPS5913005A - Pressure equalizing and releasing method of top charger for blast furnace - Google Patents

Abstract

PURPOSE:To economize energy in a titled device having plural pieces of pressure equalizing hoppers by providing a bypass pipe and valve for pressure equalization. CONSTITUTION:A bypass pipe 25 and a bypass valve 26 are provided between pressure equalizing hoppers 5 and 6. For example, if the valve 26 is opened just prior to opening the respective pressure releasing valves 12 and pressure equalizing valves 10 of the hoppers 5, 6 in a conventional charging procedure, the gas in the hopper 5 flows to the hopper 6 side owing to a pressure difference in both hoppers and the pressures in both hoppers are equalized. In other words, the pressure in the hopper 5 is reduced down to the above-described average pressure from the internal pressure 3 of the furnace and the hopper 6 is pressurized up to the above- described average pressure from the atmospheric state. Such phenomenon arises also when both hoppers are in the pressure equalizing and releasing stage reverse from the above-mentioned stage. If the valve 26 is closed and the valves 12, 10 are closed simultaneously at the point of the time when both hoppers attain the equalized pressure, the respective pressure releasing and equalizing stages of both hoppers 5, 6 are started. The flow of raw materials from upper hoppers 1, 2 to the inside of the furnace is the same as in the prior art except the difference in the respective operating procedures for the valve 26, pressure equalizing valves 8, 10, and pressure releasing valves 12, 15 in said case as well.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure equalization method for the purpose of energy saving in a top charging device of a blast furnace having a plurality of pressure equalization hoppers.

First, a conventional pressure equalization method will be explained with reference to FIG.

Raw materials are alternately introduced into the upper hopper 2 under atmospheric pressure. Blast furnace furnace 3 is normally 7 to 3 kg/crl -G
Because of the high pressure in the upper hopper 1.2, a pressure equalizing hopper 3.2 is installed between these to smoothly charge the raw materials in the upper hopper 1.2 to the furnace 3 via the collecting chute. t (in the case of two hoppers) is provided. In addition, in order to equalize the pressure in the pressure equalizing hoppers j and t, a pressure equalizing pipe 7°9 and a pressure equalizing valve 1. /θ and exhaust pressure pipe//, /g, exhaust pressure valve/2. A /S is installed, and if the equalization pressure of the hopper is high, mufflers /3 and /4 may be installed to reduce noise during exhaust pressure.

Next, the flow of the raw material from the upper hopper 2 to the furnace interior 3 will be described in detail.

For example, in order to transfer raw materials from the upper hopper/to the pressure equalization hopper 3, it is necessary to evacuate the pressure equalization hopper 5 to atmospheric pressure. Then, the upper seal valve 19 and the upper gate valve 17 are sequentially opened, and the raw material is charged into the pressure equalizing hopper j.

When the charging of the raw materials to the pressure equalizing hopper j is completed, the upper gate valve /7, the upper seal valve /9, and the exhaust pressure valve 12 are closed in sequence, and then pressure equalization of the pressure equalizing hopper j is started. The pressure equalization valve g is set to "open" 6, and pressure equalization gas is supplied to fill the pressure equalization hopper 5 to the furnace internal pressure.After the pressure equalization hopper 5 is equalized, the lower seal valve n and the lower gate valve 2 are opened. / are sequentially opened and the raw material is charged into the furnace 3. Raw material -゛.

Inside the furnace, by winter, the lower gate, 1 sho,
2 and 53. ．． 7. Close lower seal valve B and pressure equalization valve L.
Then, the exhaust pressure valve /2 is set to "open" □ to complete exhaustion of the pressure in the level hopper j. Above is the inside of the furnace 3 from the upper hopper l.
The operating procedure for each device when charging raw materials up to
This procedure is the same for the 1-consistency hopper route.In the 9° furnace top charging device, providing multiple charging routes, such as upper hopper/2, reduces the time required for the above-mentioned charging cycle. This is to avoid difficulty in securing the necessary amount of raw material to be charged due to constraints.

In the conventional charging procedure described above, the pressure equalization hopper 3. All gases within ≦ are released into the atmosphere. . Therefore, nitrogen gas or blast furnace gas used as a pressure equalization gas is consumed in each charging cycle of each hopper, which is not desirable from the viewpoint of energy saving.

The present invention has been made in order to eliminate such conventional drawbacks, and its gist is to provide a bypass pipe and a bypass valve in the bypass between each pressure equalizing hopper, and to equalize the gas in the hopper 4 to be evacuated. It is used as a gas for filling the hopper that is to be pressurized.

The present invention will be explained below with reference to FIG.

The difference between the method of the present invention and the conventional method is that a bypass pipe B and a bypass valve are provided between the pressure equalizing hoppers 3 and 4.

For example, in the conventional charging procedure, if the bypass valve is opened immediately before opening the exhaust valve 12 of the pressure equalizing hopper S and the pressure equalizing valve lθ of the pressure equalizing hopper 6, the Due to the pressure difference, the gas in the pressure equalization hopper 5 flows to the pressure equalization hopper 6 side, and the internal pressures of both hoppers are averaged.

This means that the pressure in the pressure equalization hopper 3 is reduced from the furnace internal pressure to the above average W, and that the pressure equalization hopper 6 is filled from the atmospheric pressure state to the above average pressure. Such a phenomenon also occurs when both hoppers are in the pressure equalization and depressurization process, which is completely opposite to the above.

When both hoppers reach average pressure, the bypass valve is turned on.
If both the exhaust pressure valve 12 and the pressure equalization valve /θ are opened at the same time, the pressure of each suppression hopper 51.t1 will be exhausted and the pressure will be equalized.In the case of the present invention, the above-mentioned bypass Valve, pressure equalization valve t, 10 and exhaust pressure valve/2.

/S Except for the differences in each work procedure, the flow of raw materials from the upper hopper to the bottom furnace is the same as in the conventional method.

FIG. 53 shows a sequence of operating procedures for each device when the bypass valve 26 is provided.

As described above, by using the bypass pipe and bypass valve between the pressure detection hoppers of the present invention, it is possible to reduce the amount of pressure equalization gas released into the atmosphere, and to reduce the amount of pressure equalization gas that must be supplied. This provides extremely favorable conditions for energy conservation.

Furthermore, if the effect of the ejector, tar or injector is added when the bypass valve is "opened", the bypass pressure equalization time can be shortened or gas can be forced to flow from the hopper 5 to be evacuated to the hole and par to be equalized. By promoting this, it becomes possible to significantly increase the gas removal yield. .

Furthermore, according to the present invention, in addition to the energy-saving effect due to the above-mentioned gas recovery, the initial pressure of exhaust pressure is lowered, so that the noise level during exhaust pressure is also lowered, so an expensive muffler is installed. It can also be expected to have the effect of reducing secondary equipment costs since it is not necessary.

[Brief explanation of drawings]

, FIG. 7 is a diagram showing a leveling method in a conventional furnace top charging device, FIG. 2 is a diagram showing a leveling method in a furnace top charging device having a bypass pipe of the present invention, and FIG. FIG. 2 is a diagram showing a charging time schedule using the present invention. /, 2... Upper hopper, 3... Inside the furnace, j, 4...
・Equalization/pressure hopper, 7, 9...Pressure equalization pipe, r, 10...
・Pressure equalization valve, l/, 14I...=pressure pipe, /2, /3
...exhaust pressure, valve 1. /J, /6...silencer, 1
7., /I... Upper gate valve, /9, ff...
Upper seal valve, 2/, 22...lower gate valve, 2
? , 24I...Lower seal valve, n, -...Bypass pipe, B...Bypass valve.

Claims (1)

[Claims] In the top charging device of a blast furnace having multiple pressure equalizing hoppers, a pressure equalizing bypass pipe and a bypass valve are provided between each pressure equalizing hopper, and the gas in the pressure equalizing hopper to be evacuated is used for filling the hopper to equalize the pressure. A method for equalizing and exhausting pressure in a blast furnace top charging device characterized in that it is used as a gas.