JPS6227124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust gas treatment device designed to save energy in the entire steel industry by effectively utilizing the heat retained in high-temperature gas emitted from a metallurgical furnace.

In the steel industry, iron ore is first reduced with coke in a blast furnace (referred to as hot metal) and then fed into a metallurgical furnace (hereinafter, a converter will be explained as an example), and oxygen is blown into the converter (hereinafter referred to as blowing). ) to make steel.

In this steel industry, a large amount of coke is consumed to reduce iron ore (for example, per ton of iron ore,
Consumes 400-500Kgs of coke. ) accounts for most of the energy consumption in the steel industry.

When high-quality steel is produced by blowing in a converter, iron ore (referred to as converter charging raw material) is charged into the converter as a coolant for heat balance during refining.

The quality of steel is greatly influenced by the heat balance during smelting. Therefore, if a converter charge material that is close to room temperature is charged into the converter, the temperature inside the converter will drop rapidly and the heat balance during refining will be disrupted. The current situation is that this is not possible. Also, the quality of steel is affected by the reduction rate of various raw materials input into the converter. That is, the reactions in the furnace during refining are affected by impurities. Therefore, the present situation is that large amounts of unreduced raw material charged to the converter cannot be used because it affects the quality of the steel.

On the other hand, as shown in Fig. 1, the converter exhaust gas treatment equipment cools the CO gas generated from the converter 1 during blowing in a cooler 3, then removes dust in a wet type first dust remover 4, and then removes dust in a wet type first dust remover 4. After removing the dust with the second dust remover 5, it is either diffused from the diffusion tower 7 or collected as a valuable gas in the gas holder 8.

However, the temperature of the gas leaving cooler 3 is still
This high-temperature gas has a temperature of 900 to 1000 degrees Celsius, and this high-temperature gas was directly cooled with water in the first dust remover, and the heat retained in the gas was wasted.

The present invention utilizes the heat retained in this gas and the reducing action of the gas (CO gas) to heat or heat-reduce the raw material charged in the converter, and to adjust the heating temperature of the raw material charged in the converter, and Quantify the reduction rate and avoid affecting the heat balance during smelting and reactions in the furnace.
The aim is to allow a large amount of raw material to be charged into the converter to be charged into the converter, reduce the amount of iron ore processed in the blast furnace, and reduce coke consumption.

The details will be explained below using examples shown in the drawings.
In the figure, 9 is a reactor. The gas inlet side 10 of this reactor 9 is connected to the cooler 3, and the outlet side 11 thereof is connected to the inlet side 10 via a blower 12.
It is connected to the inlet side of the dust remover on the downstream side.
The reactor 9 is loaded with a metallurgical furnace charge material 22, and a cut-off damper 13 is provided at the outlet of the metallurgical furnace charge material. A weighing hopper 14 is connected to this cut-off damper 13, and a carry-out conveyor 15 and a metallurgical furnace charging raw material supply chute 16 are connected to the cut-off damper 13.
It is connected to the gas inlet of the cooler 3 via. In addition, 17 is a metallurgical furnace charging raw material storage hopper, 1
8 and 20 are unloading conveyors, 19 is a weighing hopper, and 2
1 is a transport conveyor.

In this embodiment configured as above, the operation will be explained next. First, a metallurgical furnace charge material 22 is loaded into the reactor 9 . This metallurgical furnace charging raw material 2
2 is a reactor 9 in order to obtain the desired reduction rate in consideration of the heat balance during refining in the converter 1.
The processing capacity of the raw material 22 charged in the metallurgical furnace and the blower 2
An amount corresponding to the air blowing capacity of 1 is weighed in advance using a weighing hopper 19 and loaded into the reactor 9.

With the reactor 9 loaded in this way,
Gate 24 is closed. Cut-off damper 13
are already closed when loading the metallurgical furnace charge 22 into the reactor 9. Therefore, the inlet and outlet of the metallurgical furnace charging raw material 22 of the reactor 9 are in a sealed state. On the other hand, the gas vented by the blower 12 is prevented from venting into the reactor 9 by keeping the suction damper 23 in a closed state during non-blowing.

Next, blowing is started and when gas at a specified temperature and a specified Co concentration is generated from the converter 1, the suction damper 23 is opened and a certain amount of exhaust gas is vented into the reactor 9. At this time, the metallurgical furnace charging raw material 22 loaded into the reactor 9 is heated and reduced. The heating temperature and reduction rate of the raw material 22 charged into the metallurgical furnace are determined by the amount of gas sucked in by the blower 12.

That is, there are differences between the heating temperature and reduction rate of the metallurgical furnace charging raw material 22, the amount of the metallurgical furnace charging raw material 22, the heat balance during refining in the converter 1, and the reaction in the furnace.
There is an organic relationship, and this organic relationship is adjusted by the suction gas amount of the blower 12 and the weighing hopper 14.

In other words, the relationship between the heat balance during refining, the temperature and amount of the metallurgical furnace charging material 22, the reduction rate of the metallurgical furnace charging material 22, and the reaction in the furnace is set, and the amount of the metallurgical furnace charging material 22 charged is set. The suction air flow rate of the blower 12 is adjusted so that the temperature and reduction rate of the raw material 22 charged into the metallurgical furnace become the set values. The thus obtained metallurgical furnace charge material 22 having a specified temperature, a specified reduction rate, and a specified amount is charged into the furnace.

On the other hand, the exhaust gas that has passed through the reactor 9 joins the exhaust gas that has passed through the cooler 3 at the inlet side of the dust remover 4, is cooled to remove dust as usual, and is collected in the holder 8.

As detailed above, according to the present invention, the metallurgical furnace is charged with raw materials, and the exhaust gas is passed into the reactor sealed by the gate and cut-off damper, and the amount of the exhaust gas is adjusted by the blower. Since the amount of raw material charged into the metallurgical furnace can be adjusted using a weighing hopper, the temperature, reduction rate, and amount of raw material charged into the metallurgical furnace can be quantified in relation to the heat balance during refining and the reaction in the furnace. I can do it,
In addition to making optimal refining possible, the temperature, reduction rate, and amount of the raw material charged in the metallurgical furnace can be arbitrarily adjusted in relation to the heat balance during refining and the reaction in the furnace.
Since it is possible to increase the input amount of metallurgical furnace charging raw material and to significantly reduce the amount of metallurgical furnace charging raw material processed in the blast furnace, it is possible to significantly reduce energy consumption in the steel industry. Also, we made use of the exhaust gas before it enters the wet type first dust remover, so
The heat retained in the exhaust gas can be effectively used, and at the same time, the heat retained in the exhaust gas within the exhaust gas device can be effectively utilized, and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an exhaust gas treatment device, and FIG. 2 is a diagram showing only the inventive part in an embodiment of the present application. 3...Cooler, 9...Reactor, 10...Gas inlet side, 11...Gas outlet side, 12...Blower, 13...Cut-off damper, 14...Weighing hopper.

Claims (1)

[Claims] 1. In an exhaust gas treatment device that recovers or dissipates the gas emitted from a metallurgical furnace after cooling and removing dust, a reactor is provided with a gate and a cut-off damper on the inlet side and the outlet side of the raw material charged in the metallurgical furnace, respectively, and the reactor is installed upstream of the dust remover. The gas inlet side is branched from the side and connected to the gas inlet side of the above reactor, while the gas outlet side of the reactor is connected to the inlet side of the dust remover via a blower, and a part of the gas coming out of the metallurgical furnace is transferred to the reactor. A metallurgical furnace equipped with a device for heating or thermally reducing raw materials charged in a metallurgical furnace, which heats or heat-reduces the raw materials charged in a metallurgical furnace loaded in a reactor, and then guides them to a dust remover for dust removal and recovery. Exhaust gas treatment equipment.