KR102424934B1 - Smelting assembly for the production of steel - Google Patents

Abstract

The present invention relates to a smelting apparatus for steelmaking, which is provided to check the clogging of a dust collector based on the flow rate of combustion gas to notify the same to a manager, resolve the clogging of the dust collector without stopping a smelting apparatus, and use all parts of the dust collector for collecting dust. To this end, the smelting apparatus for steelmaking according to the present invention comprises: a dust collector (30) which filters dust included in combustion gas discharged from an electric furnace; an inlet side flow rate sensor (40) and an outlet side flow rate sensor (50) which individually detect the flow rate of the inlet side and the outlet side of the dust collector; a controller (60) which compares the detection values of the inlet side flow rate sensor and the outlet side flow rate sensor to determine that the dust collector has been clogged when the flow rate of the outlet side of the dust collector is smaller than the flow rate of the inlet side thereof; and an alarm (70) which notifies the clogging of the dust collector by means of the control of the controller. The smelting apparatus further comprises: a brush (80) which is installed to reciprocate along the filter of the dust collector and is operated by means of the control of the controller to clean the filter; and a collection box (83) which is separably installed at the lower portion of the dust collector, and collects dust removed by the brush.

Description

Smelting equipment for steelmaking

The present invention relates to a smelting apparatus for steelmaking, and more particularly, to a smelting apparatus for steelmaking that checks and treats clogging of a dust collector based on a flow rate of combustion gas generated during smelting.

This section provides background information related to the subject matter of the present application and is not necessarily prior art.

In general, smelting is to extract metal by melting ore, and there is a method using an electric furnace.

An electric furnace uses high-voltage and high-current electric arc heat to melt metals such as iron to produce molten iron. In such an electric furnace, the internal temperature must be maintained at a high temperature for the melting of the ore, so that the material inside the furnace is completely melted and smelting can be performed as desired.

As described above, when metal is melted in an electric furnace, combustion gas is generated, and the generated combustion gas contains harmful substances such as dust. Gas and dust will have to be filtered out. In addition, if the combustion gas is discharged as it is, a large amount of harmful substances are discharged together. Therefore, the dust must be filtered using a dust collector and only the purified air must be discharged.

The filter of the dust collector is mostly made of non-woven fabric or fibrous material such as polyester, and if the combustion gas with a high temperature of 1000 ° C or more directly flows into the dust collector, the filter of the dust collector is damaged. have.

As a patent document that can confirm the background art of the present invention, Patent Registration No. 10-2041580 discloses a melting furnace for smelting metal by heating to a high temperature; a suction member for introducing and delivering air around the melting furnace; a cooling dust collecting member for introducing air delivered from the suction member to cool the air and at the same time separate and remove particles contained in the air; a dust collecting member for separating and removing particles contained in the air while injecting water into the introduced air by introducing the air transferred from the cooling and dust collecting member; and a dry dust collecting member for separating and removing particles contained in the air by introducing the air transferred from the spraying dust collecting member, a conical filter member is installed inside the cooling dust collecting member, and the conical filter member is located below the A plurality of compressed air injection members for rotating air around the conical filter member are installed, the cooling dust collecting member includes a tank member having a circular cross section on a flat cross-section, and the plurality of compressed air injection members are the tanks. It is a metal smelting apparatus including a dust collector which is installed inclined on a flat cross-section from a radial direction in a circular cross-section of a member.

The prior art includes a technique for removing the dust generated during smelting, but there is no technique for checking the clogging of the dust collector, and consequently, the dust collection efficiency decreases or unnecessary cost loss occurs due to frequent replacement of the filter.

In addition, since the technology for resolving clogging of the dust collector is not applied to the dust collector, there is an inconvenience such as cleaning the dust collector after stopping the smelting device.

In addition, since the combustion gas flows only in one direction of the dust collector, only a part of the dust collector is used and cleaning or replacement is performed in this state, thereby increasing the maintenance cost.

Registered Patent No. 10-2041580

An object of the present invention is to provide a smelting apparatus for steel making, in order to solve the above-described problems, check the clogging of the dust collector based on the flow rate of the combustion gas and inform the manager.

And, another object of the present invention is to solve the clogging of the dust collector without stopping the smelting apparatus.

Another object of the present invention is to use all parts of the dust collector for dust collection.

According to the present invention, there is provided a smelting apparatus for steel making, comprising: a dust collector for filtering dust contained in combustion gas discharged from an electric furnace; an inflow-side flow rate sensor and a discharge-side flow rate sensor respectively sensing the flow rates of the inflow side and the discharge side of the dust collector; a controller that compares the detection values of the inflow-side flow sensor and the discharge-side flow sensor and determines that the dust collector is clogged when the discharge-side flow rate of the dust collector is less than the inflow-side flow rate; It is characterized in that it includes an alarm notifying the clogging of the dust collector through the control of the controller.

And, the present invention is applied to the dust collector and characterized in that it includes a cleaning means for cleaning the dust collector through the control of the controller.

In addition, it characterized in that it includes a flow path and a valve for guiding the combustion gas to flow from the downstream to the upstream of the dust collector.

According to the smelting apparatus for steel making according to the present invention, it is possible to give reliability at the cleaning or replacement time of the dust collector by judging the clogging of the filter based on the combustion gas flowing into and discharged from the dust collector and notifying the manager, and thus unnecessary cost is wasted It has the effect of improving the dust collection efficiency.

In addition, by applying a brush to the dust collector, the filter can be cleaned immediately when cleaning is required without stopping the smelting device, thereby helping to extend the life of the filter and increasing the purification rate of exhaust gas.

In addition, by guiding the combustion gas from the back of the dust collector to the front, the back side of the filter is also used as the filtering surface, thereby increasing the effectiveness of the filter and removing the dust attached to the front side of the filter, thereby extending the service life of the filter.

1 is a block diagram of a steel smelting apparatus according to the present invention.
Figure 2 is an exemplary view of the cleaning means applied to the steel smelting apparatus according to the present invention.
Figure 3 is another exemplary view of the brush applied to the steel smelting apparatus according to the present invention.
Figure 4 is another exemplary view of the steel smelting apparatus according to the present invention.
5 is another exemplary view of the cleaning means applied to the steel smelting apparatus according to the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

As shown in Figure 1, the steel smelting apparatus according to the present invention, an electric furnace 10 for melting ore, a cooler 20 for cooling the combustion gas discharged from the electric furnace 10, the cooler 20 A dust collector 30 that filters dust from the cooled combustion gas through a chimney and discharges the purified gas to the atmosphere through a chimney, an inlet flow sensor 40 that detects the flow rates of the inlet and outlet of the dust collector 30, respectively, and The discharge-side flow sensor 50, the inflow-side flow sensor 40 and the discharge-side flow rate sensor 50 compare the detection values to determine the clogging of the dust collector 30. The dust collector through the control of the controller 60 and an alarm 70 notifying the blockage of (30).

In the present invention, various known configurations such as a combustor for incomplete combustion by burning the combustion gas discharged from the electric furnace 10 are freely included.

The electric furnace 10 melts a metal material such as iron as ore, and is connected to the cooler 20 through a duct 11 to discharge combustion gas.

The cooler 20 lowers the combustion gas discharged from the electric furnace 10 to a temperature for discharging to the atmosphere, and the cooling temperature is, for example, around 100°C.

The cooler 20 is connected to the dust collector 30 through the inlet flow passage 21 in order to supply the cooled combustion gas to the dust collector 30 .

The dust collector 30 filters the dust contained in the combustion gas flowing in from the cooler 20 and then discharges it to the chimney through the discharge passage 31, and a closed type dust collector case 32 and It is accommodated in the dust collector case 32 and includes one or more filters 33 for filtering dust, and various products such as non-woven fabrics can be used for the filter 33 .

At least one fan is installed in the flow path of the chimney from the electric furnace 10 for the exhaust flow of the combustion gas.

The inflow-side flow rate sensor 40 is installed in the inflow flow path 21 to detect the flow rate of the combustion gas flowing through the inflow flow path 21 , that is, the flow rate of the combustion gas flowing into the dust collector 30 .

The discharge-side flow rate sensor 50 is installed in the discharge flow path 31 to detect the flow rate of the combustion gas flowing through the discharge flow path 31 , that is, the flow rate of the combustion gas discharged from the dust collector 30 .

The flow rate value by the inflow side flow sensor 40 and the discharge side flow sensor 50 is the basis for determining the filter 33 clogging of the dust collector 30 , and the controller 60 controls the flow rate flowing into the dust collector 30 and The clogging of the filter 33 is determined based on the difference in the discharged flow rate.

The difference between the inflow flow rate and the discharge flow rate, which is a reference value for determining the blockage of the controller 60, can be determined through an experiment, and, for example, if the filter 33 is not clogged, the inflow flow rate and the discharge flow rate are not significantly different and the filter ( 33), it can be seen that there is a large difference between the inflow flow rate and the discharge flow rate. For example, the case where the discharge flow rate shows a difference of within 10% from the inflow flow rate is referred to as clogging of the filter 33 . Alternatively, it may be determined that the filter 33 is clogged when the current flow rate is smaller than the previous flow rate by a certain range (eg, 80%, of course, it can be set by the administrator) through comparison of the previous flow rate and the current flow rate.

The reference value can also be set by an administrator.

The alarm 70 can output an alarm sound or the like through the control of the controller 60 when the controller 60 determines that the filter 33 is clogged or transmit a notification message to the manager's portable terminal (smart phone). .

According to the smelting apparatus for steel making according to the present invention configured as described above, ore is put into the electric furnace 10 and melted, and the combustion gas generated at this time is cooled while passing through the cooler 20 and dust while passing through the dust collector 30 . After this is removed, it is discharged into the atmosphere through a chimney. In this process, the inflow-side flow rate sensor 40 and the discharge-side flow rate sensor 50 detect the flow rate of the combustion gas flowing through the inflow flow path 21 and the discharge flow path 31, respectively, and transmit it to the controller 60 . The controller 60 compares the inflow flow rate and the discharge flow rate to calculate the difference, and when the difference value is smaller than a reference value, for example, when the discharge flow rate is 90% or more of the inflow flow rate, it is determined that the filter is clogged. The controller 60 controls the alarm 70 according to the determination result to notify the filter clogging. Upon receiving a notification of filter clogging, the manager stops the operation of the electric furnace 10 and then cleans or replaces the filter 33 of the dust collector 30 .

The present invention may include a cleaning means to enable active filter cleaning in case of filter clogging, and as shown in FIG. 2 , the cleaning means is, for example, a brush 80 .

The brush 80 includes a brush body 81 and brush bristles 82, is installed in the transverse direction across the filter 33 in front of the filter 33, and is usually located above the filter 33 and the filter ( The brush bristles 82 scrape the surface of the filter 33 while descending and ascending toward the bottom of the 33) drop the dust. For this purpose, the brush 80 is used together with a lifting means. The lifting means is a rack installed along the vertical direction at least on one of the left and right sides of the brush 80 , and a pinion that ascends or descends along the rack through a motor mounted on the brush body 81 . The lifting means is not limited to the above-mentioned rack/pinion type, and various methods such as screw bolts, ball screws, hydraulic cylinders, orbital belts are possible. The elevating means is driven on/off under the control of the controller 60, that is, when it is determined that the filter is clogged, the brush 80 is lowered and raised one or more times, and the stop control is based on the difference between the inflow flow and the discharge flow. It is possible when the value is satisfied.

The brush 80 is disposed on the upper or lower portion of the filter 33 so as not to interfere with the flow of the combustion gas in normal use.

In addition, the lower portion of the filter 33 includes a collection box 83 for collecting the dust removed from the filter 33 by the brush 80 . The collection box 83 is configured, for example, in a drawer type at the bottom of the dust collector case 81 .

It is possible that the collection box 83 has only a space in which the dust is contained, but absorbs moisture so that the collected dust does not scatter, and an absorbent material such as a mesh or sponge for fixing the dust through the moisture can be accommodated.

In addition, the brush 80 is also possible to remove dust by using the pressure of the combustion gas passing through the dust collector 80, and for this purpose, as shown in FIG. do. The flow path 84 is formed in the form of an orifice to increase the flow rate, and after the combustion gas is introduced through the inlet on one side, it is discharged through the outlet on the other side, that is, the filter 33 side, and the dust from the filter 33 is removed through the pressure. Remove.

The flow path 84 may include two discharge units in order to more rapidly drop the dust attached to the filter 33 and guide the dust removed from the filter 33 to the collection box 83 at the bottom, and the first discharge unit ( 85-1) is formed in a direction perpendicular to the filter 33, and the second discharge part 85-2 is formed to be inclined toward the bottom to induce dust to the bottom.

The brush 80 is configured to have a narrow cross-sectional area compared to the area of the filter 33 so that dust can be cleaned while the combustion gas is discharged.

In the present invention, in order to use both surfaces of the filter 33 as a filtering surface, the first and second bypass passages 90 and 91, the inlet passage 21 and the discharge passage 31 and the first and second bypass passages are as follows. It includes first to fourth valves (92, 93, 94, 95) for opening and closing the flow passages (90, 91).

The first bypass flow path 90 is connected to the inlet flow path 21 and the discharge flow path 31 of the dust collector 30 on both sides in the longitudinal direction (first and second branch points P1 and P2) to collect the combustion gas from the dust collector Lead to the back of (30).

The second bypass flow path 91 guides the combustion gas flowing from the rear to the front side of the dust collector through the first bypass flow path to the downstream (chimney side) of the dust collector 30, and both sides in the longitudinal direction are each inflow flow path. 21 and the discharge passage 31 are connected (third and fourth branch points P3 and P4), and the inflow side is connected to the first branch point P1 of the first bypass passage 90 connected to the inflow passage 21 and It is between the dust collectors 30 and the discharge side is downstream of the second branch point P2 of the first bypass flow path 90 connected to the discharge flow path 31 .

The first valve 92 opens and closes between the first branch point P1 and the third branch point P3.

The second valve 93 opens and closes between the second branch point P2 and the fourth branch point P4.

The third valve 94 opens and closes the first bypass flow path 90 , and the fourth valve 95 opens and closes the second bypass flow path 91 .

The first to fourth valves 92, 93, 94, and 95 are automatically opened and closed under the control of the controller 60, and control the flow of combustion gas through an organic opening and closing relationship. Of course, the first to fourth valves 92, 93, 94, and 95 are also opened and closed by a manual operation of an administrator.

According to the above configuration, the combustion gas normally flows through the inlet flow passage 21 - the dust collector 30 - the discharge passage 31 as a path (the first and second valves 92 and 93 are opened, the third and fourth valves ( 94,95) closure).

On the other hand, when it is determined that the filter is clogged, the conditions of closing the first and second valves 92 and 93 and opening the third and fourth valves 94 and 95 are changed, and the combustion gas passes through the first bypass passage 90 . It is guided to the rear of the dust collector 30 through the dust collector 30 , passes from the back to the front of the dust collector 30 , and is again guided downstream of the dust collector 30 through the second bypass flow path 91 and discharged.

Through this process, the combustion gas may drop the dust accumulated in the front of the filter 33 , and the dust may be removed through the rear of the filter 33 .

The present invention may further include water in the cleaning means.

The water supply is connected to the pump 87 through the tank 86 in which water is stored, the pump 87 for pumping the water in the tank 86, and the supply pipe 88, and the water supplied by the pumping of the pump 87. It includes a nozzle that supplies water to the flow path in the brush body 81 so that water is sprayed (or sprayed) on the filter 33 .

The pump 87 is turned on/off through the control of the controller 60, and is turned on/off by the manual operation of an administrator.

On the other hand, the present invention uses a separate tank 86 as an auxiliary and includes a water tank 22 for storing water generated by cooling at the bottom of the cooler 20 to use the water generated from the cooler 20 as cleaning water. and connecting the pump 87 to the water bath 22 . In this case, a low water level sensor and a high level sensor for checking the water in the water tank 22 are included, and the tank 86 is connected to the pump 87 when the low water level is detected, and the water tank 22 is connected to the tank 86 and the pipe when the high level is detected. It is preferable to include a configuration for discharging the water of the water tank 22 to the tank 86 by connecting it.

In addition, since the water stored in the water tank 22 may be at a high temperature, a cooler for lowering the temperature of the water may be included in the inside of the water tank 22 or in the water supply path.

10 electric furnace, 11: duct
20: cooler, 21: inlet flow path
22: water tank, 30: dust collector
31: discharge flow path, 32: dust collector case
33: filter, 40: inlet flow sensor
50: discharge side flow sensor, 60: controller
70: alarm, 80: brush
81: brush body, 82: brush bristles
83: collection box, 84: euro
85-1,85-2: first and second discharge parts, 86: tank
87: pump, 88: supply pipe
90: first bypass flow path, 91: second bypass flow path
92,93,94,95: first to fourth valves;

Claims (4)

a dust collector for filtering the dust contained in the combustion gas discharged from the electric furnace;
an inflow-side flow rate sensor and a discharge-side flow rate sensor respectively sensing the flow rates of the inflow side and the discharge side of the dust collector;
a controller that compares the detected values of the inflow-side flow sensor and the discharge-side flow sensor and determines that the dust collector is clogged when the discharge-side flow rate of the dust collector is less than the inflow-side flow rate;
an alarm informing that the dust collector is clogged through the control of the controller;
a brush that reciprocates along the filter of the dust collector to drop the dust attached to the filter under the control of the controller;
a collection box which is detachably installed at the bottom of the dust collector and collects the dust removed by the brush;
a first bypass passage connected to the inflow passage and the discharge passage of the dust collector to guide the combustion gas toward the rear of the dust collector;
a second bypass passage for guiding combustion gas flowing from the rear to the front of the dust collector to a downstream side of the dust collector through the first bypass passage;
and a valve for opening and closing the first and second bypass passages between branch points of the inflow passage and the first and second bypass passages, between the branch points of the discharge passage and the first and second bypass passages, and the first and second bypass passages; A smelting apparatus for steel making, characterized in that when the filter of the dust collector is clogged, the combustion gas passes from the rear to the front of the dust collector. delete delete The method according to claim 1, A cooler installed between the electric furnace and the dust collector to cool the combustion gas discharged from the electric furnace, and a water supply that supplies water generated from the cooler to the brush to wash the filter using brush bristles and water. A smelting apparatus for steel making, comprising a.

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