KR20040007919A - 2-step vertical high temperature reduction furnace for melting simulation test - Google Patents

Abstract

PURPOSE: A two-step vertical high temperature reduction furnace for melting simulation test is provided to evaluate and analyze melting characteristics at high temperature and evaluate and analyze reaction characteristics of high temperature melting sample and coke by varying reduction gas composition, heating temperature and impressed load. CONSTITUTION: The two-step vertical high temperature reduction furnace for melting simulation test comprises first step electric furnace(100) comprising cylindrical guide conduit(112) in which electric heating element(111) is installed, cylindrical crucible(113) at the bottom of which perforated plate is formed, circular guide conduit fixing member(140) for fixing the cylindrical guide conduit from the outside, and cap member(130) inserted onto an upper opening of the cylindrical guide conduit to close the cylindrical guide conduit; second step electric furnace(200) comprising cylindrical guide conduit in which electric heating element is installed, cylindrical crucible at the bottom of which perforated plate is formed, circular guide conduit fixing member for fixing the cylindrical guide conduit from the outside, crucible supporting conduit(115) fixing member adhered to a lower part of supporting conduit and connected to the guide conduit fixing member, electric furnace connection member mounted on an upper part of the guide conduit, and adaptor conduit positioned in an upper part of the crucible inside the cylindrical guide conduit, wherein the second step electric furnace is vertically connected to a lower part of the first step electric furnace; a vertical directional lowerable and liftable means for separating the first step electric furnace from the second step electric furnace; cylindrical dropping sample collecting device(300) comprising semi-cylindrical sample pan mounted on a lower part of the guide conduit fixing member of the second step electric furnace; differential pressure measuring device for measuring pressure difference between pressure measuring nozzles; gas preheating device connected to gas injection port of a lower part of the second step electric furnace; and a discharge reaction gas burner connected to the cap member of the first step electric furnace to oxidize CO contained in discharge gas and cool the discharge gas.

Description

2-stage vertical high temperature reduction furnace for melt simulation test {2-STEP VERTICAL HIGH TEMPERATURE REDUCTION FURNACE FOR MELTING SIMULATION TEST}

The present invention relates to a two-stage vertical high temperature reduction furnace for melt simulation testing, and more particularly, an electric furnace for installing a guide conduit in a heating chamber made of refractory and provided with a heating element, and charging a sample into a crucible and heating the inside thereof. Connected in two stages, the softening, melting, fusion, and dropping of the charged sample is carried out by changing the reducing gas composition, heating temperature, and applied load to evaluate and analyze the melting characteristics at high temperature, and furthermore, the hot melt sample and the cork. The present invention relates to a two-stage vertical high temperature reduction furnace for melt simulation tests for evaluating and analyzing the reaction characteristics of a swa.

Conventional iron ore melting characteristic evaluation has been made in a horizontal muffle furnace (MUFFLE FURNACE). This makes it difficult to inject the reducing gas and makes it difficult to be sure that the injected reducing gas is in efficient contact with the sample, and it is possible to evaluate the differential melting characteristics (DIFFERENTIAL MELTING CHARACTERISTICS) and the melting characteristics for load application of the mixture of iron ore samples. There was a problem that could not be interpreted.

By providing a vertical high temperature reduction furnace which solves the problems of the iron ore melting characteristic evaluation apparatus by the conventional horizontal muffle furnace as described above, the injected reducing gas is brought into efficient contact with the sample, and the differential melting characteristics and applied load of the sample It is an object of the present invention to provide a two-stage vertical high temperature reduction furnace for melt simulation testing that can evaluate and analyze the melting characteristics of changes and further evaluate and analyze the reaction characteristics between the hot melt sample and the coke. .

1 is a block diagram of a main part of a two-stage vertical reduction furnace.

2 is a front view and a bottom view of the crucible

3 is a cross-sectional view of the first stage furnace guide conduit cap member.

4 is a detailed cross-sectional view of the components of the first stage furnace guide conduit cap member.

5 is a front view and a side view of an example of a sample collection device.

6 is a schematic control configuration diagram of the first stage electric furnace.

<Description of the symbols in the main part of the drawing>

100: first stage electric furnace

110: refractory

111: electric heating element

112: first stage furnace guide conduit

113: first stage electric furnace crucible

114: first stage electric furnace crucible support

115: first stage electric furnace crucible support conduit

120: first stage electric furnace refractory coke

130: first stage electric furnace cap member

140: first stage electric furnace guide conduit fixing member

150: first stage electric furnace crucible support conduit fixing member

200: second stage electric furnace

300: dropping sample collection device

310: site glass

320: reducing gas inlet

350: dropping sample holder

In order to achieve the above technical problem, the present invention provides a two-stage vertical high temperature reduction furnace.

The two-stage vertical high temperature reduction furnace according to the present invention is a schematic connection of two vertical electric furnaces in two stages up and down, and the present invention will be described in detail below.

The electric furnace of the present invention is an electric heating element, for example, a SiC or SUPER KHANTAL heating element, in a heating chamber formed by stacking refractory bricks in a hexahedron or a cylindrical or other three-dimensional structural frame or by stacking refractory plates cut to a suitable size. And a guide conduit for penetrating the refractory up and down. The power input to the heating element can be controlled based on the difference between the furnace internal temperature or the guide conduit internal temperature measurement and the test set temperature.

Guide conduits are typically cylindrical alumina tubes. Within the guide conduit is a crucible support conduit, typically of the same material as the guide conduit, having an outer diameter that is less than or substantially the same as its inner diameter. The crucible support conduit is a member for supporting a crucible holder and a crucible for charging a sample mounted thereon.

The crucible for charging a sample consists of a material that does not react with a sample, for example iron ore, for example graphite or alumina. The crucible is cylindrical and its diameter can be about 55 mm in diameter when the outer diameter does not interfere with the operation of pulling out the crucible for sample loading, for example, when the inner diameter of the guide conduit is 77 mm. . The bottom of the crucible is a PERFORATED PLATE to charge the sample and secure the passage of reducing gas. That is, a large number of circular holes may be formed in the disc or a plurality of elliptical holes may be formed in a long and narrow manner. During the test, the molten iron ore falls through the bottom hole (melt drop) into the sample collection device.

The guide conduit is fixed to the frame by a guide conduit fixation member, and the crucible support conduit is connected and fixed to the guide conduit support member by the crucible support conduit fixation member. The conduit fixation members are typically equipped with one to three O-rings between the fixation member and the conduit to mitigate impact and maintain airtightness due to direct contact between the conduit and the fixation member. The o-rings are fixed by protrusions of the respective fixing members on one side of the o-ring and by separate o-ring retainers (RETAINER) on the opposite side, and the o-ring retainers are guided by screws or pins, etc. Secured to a conduit or support conduit. The upper portion of the guide conduit fixing member extends in the horizontal direction so that the guide conduit is fixed by forming a hole therein and connecting the guide conduit fixing member to the frame using a screw or the like. The guide conduit fixing member has a cylindrical shape, and has a function of simultaneously supporting and fixing the o-ring and the guide conduit by forming a projection in the shape of a longitudinal cross section at the bottom thereof in three steps. And a water jacket (WATER JACKET) is provided on the outside of the fixing member. This may be formed by cutting the outer surface of the fixing member to a depth deeper than the outer surface, or by attaching the half pipe by welding or the like. Cooling water inlets and outlets are formed in the water jacket, which connects the cooling water circulation pipe to prevent thermal expansion of the conduit and the resulting stress breakage and o-ring protection. In addition, a tapered flange is formed on the outer side of the lower end of the guide conduit fixing member. This is fixed by the corresponding flange and union clamp of the crucible support conduit fixing member described below to fix the crucible support conduit, and when the sample is loaded, the crucible support conduit, the crucible and the crucible support can be easily separated from the electric furnace and the sample can be charged. Make sure

The crucible support conduit fixation member has a structure and function similar to the guide conduit fixation member. However, unlike the guide conduit fixing member, the support conduit fixing member forms a tapered flange on the upper end thereof, and connects and fixes the guide conduit fixing member with a union clamp, and forms a tapered flange on the lower portion of the O-ring retainer. Let's do it.

An appropriate adapter pipe member is attached to the lower end of the support conduit fixing member of the second stage electric furnace as necessary, and then a sample collecting device, which will be described later, is attached to the lower end thereof. An appropriate adapter pipe member is attached to the lower end of the supporting conduit fixing member of the first stage electric furnace as necessary, and then the lower end thereof is connected by the upper flange of the guide conduit upper connecting member of the second stage electric furnace and a union clamp or other connecting member.

A cylindrical adapter conduit of alumina or graphite may be mounted inside the top of the sample charging crucible of the guide conduit of the second stage electric furnace. It is wider at the top and narrower at the bottom, i.e. tapered, which causes the melt sample loaded in the first stage electric furnace to fall precisely into the sample crucible of the second stage electric furnace and is damaged by the guide conduit contacting the hot drip melt. It prevents it from becoming.

The guide conduit upper connecting member of the second stage electric furnace is structurally very similar to the crucible supporting conduit fixing member of the second stage electric furnace. However, there is no tapered flange at the bottom of the o-ring retainer and is fixed to the guide conduit by screws or pins.

The first stage electric furnace has a structure generally similar to the second stage electric furnace described above. Hereinafter, the characteristic part of a 1st stage electric furnace is demonstrated.

The guide conduit fixing member of the first stage electric furnace not only functions to fix the guide conduit to the frame, but also the guide conduit and the crucible, crucible base and crucible support conduit therein when the first stage electric furnace is to be separated from the second stage electric furnace. It has a function for raising and lowering in the vertical direction. The lifting means may be elevated by forming a screw hole in the plate extending on the upper side of the guide conduit fixing member and laying the screw to turn the screw, and installing a jack (KACK) on the extended plate or a conventional hoist crane, etc. It is also possible to use lifting means. However, in order to prevent breakage of alumina or graphite, or other ceramic guide conduits, a screw system capable of finely adjusting the elevation of the guide conduits or the like is preferable.

The upper opening of the first stage furnace guide conduit inserts an alumina or other refractory coke to isolate the interior of the hot guide conduit from the outside. In this case, in order to increase the heat shielding effect, one or more air gaps may be formed in the middle of the refractory. Air gaps are generally suitable perpendicular to the longitudinal direction of the cylindrical refractory to increase the heat shielding effect. The center of the refractory can be provided with a reducing gas discharge passage in the longitudinal direction, through which the temperature measuring means, for example, a thermocouple (THERMOCOUPLE) is usually mounted. In addition, an apparatus for measuring shrinkage of the charged sample may be provided in this passage.

The refractory coke can cut a cylindrical refractory in half to form a longitudinal gas outlet at its center, or to form a longitudinal gas outlet at its center by drilling or other mechanical methods in the cylinder. The embodiment of the present invention described later was based on the latter method. The method of fixing the refractory coke to the guide conduit may include forming a protrusion at the top of the refractory coke so as to extend over the upper end of the guide conduit when inserted into the guide conduit or to form a groove in the exhaust gas passageway and to form a correspondingly shaped structure. There is a method of inserting and attaching it to the lid member described later with a screw, but the latter method is preferable.

The cap member is generally disc-shaped, and may be provided with a screw groove for mounting a temperature measuring device or a shrinkage measuring device at a central portion thereof. The circumference of the cap member is tapered at the upper portion so that it can be connected by the guide conduit upper connecting member and the clamp.

The shrinkage measuring device is provided with means for installing an alumina or graphite rod perpendicular to the perforated disc which has a diameter slightly smaller or substantially the same as the sample charging crucible inner diameter and fixed to the guide conduit lid member near the top of the rod. An air cylinder or a hydraulic cylinder for applying a constant load may be attached to the top of the rod, and the pressure or applied load of air or oil may be adjusted by an automatic control device. And, the shrinkage rate can be measured by measuring the displacement of the rod, which can be constituted by a system having a displacement measuring sensor and an indicator fixed to the cap member.

The tapered flange of the crucible holding conduit fixing member of the first stage electric furnace and the guide conduit connecting member of the second stage electric furnace can be connected using a union clamp or other fastening mechanism. However, it is preferable to use a union clamp for ease of separation. And, if necessary, an adapter pipe member of a suitable length having flanges tapered on both upper and lower ends can be inserted and connected between the guide conduit fixing member of the first stage electric furnace and the guide conduit upper connecting member of the second stage electric furnace.

The load sample collection device is cylindrical and gas mounted under the guide conduit of the second stage electric furnace, having a glass, a reducing gas inlet, and a semi-cylindrical sample receiver capable of extending in the longitudinal direction and moving in the longitudinal direction therein. Is kept confidential to prevent leakage.

The two-stage vertical high temperature reduction furnace of the present invention may further include a reducing gas preheating device. When supplying reducing gas such as N ₂ , CO, H ₂ into the electric furnace, if the temperature is below 1200 ℃, the effect of cooling the inside of the electric furnace will occur, and the thermal shock inside the furnace can cause damage to the equipment, thus preheating the gas. A device is needed. The gas preheater may be a refractory chamber or a stainless steel chamber having an electric heating element. In addition, in addition to the gas preheater, the system may be provided with a system for controlling the power supplied to the heating element of the gas preheater or controlling the flow rate of the reducing gas in cooperation with a temperature measurement and control system inside the electric furnace.

The two stage vertical high temperature reduction furnace of the present invention may also be provided with an exhaust gas combustion device. The gas discharged from the electric furnace is usually a high temperature of 1000 ℃ or more and contains about 30% of CO, so it is necessary to cool it, burn it, oxidize it and safely discharge it. The exhaust gas combustion device may be composed of an ignition device and a cooling device.

Each sample charging crucible of the first stage electric furnace and the second stage electric furnace may be charged with a separate sample.The crucible of the first electric furnace may be a molten test sample, and the sample crucible of the second electric furnace may be a coke or It is also possible to charge a molten sample and a substance that can react at high temperatures to evaluate the reaction between the molten sample and the coke. In addition, each electric furnace may be separated, and each sample may be charged and a separate evaluation may be performed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.

1 to 6 are diagrams for explaining one embodiment of the embodiment according to the present invention.

1 is a schematic diagram showing the main part of a two-stage vertical high temperature reduction furnace according to the present invention. Referring to FIG. 1, the first stage electric furnace 100 is connected to the guide conduit connecting member 230 of the second stage electric furnace by a clamp through the first stage electric furnace guide conduit fixing member 150, and the second However, it is connected to the dripping sample collection device 300 through the flange of the lower end of the o-ring retainer 250 of the crucible support member 250, and the sample collection device 300 includes a site glass 310 and a high temperature reducing gas injection port 320. And a dropping sample holder 350. Refractory coke 120 and cap member 130 are shown at the top of the first stage furnace guide conduit, one example of which is shown in FIG. 4.

Figure 2 shows an example of the sample charging crucible, a plurality of long oval holes are formed at the bottom to serve as a gas passage and a dropping passage of the molten sample.

3 shows the assembled state of the refractory cocks 121 and 122 and the cap member 130 and the thermocouple 128 assembled above the guide conduit of the first stage electric furnace. An exhaust gas outlet 129 is formed at a side of the thermocouple 128, and the exhaust gas combustion device is connected to the exhaust coupler through a pipe.

4, the refractory coke is divided into two parts, and the two parts are assembled by screwing. The upper part 122 of the refractory coke is also assembled with the lid member in a screw 126 manner. An air gap 124 is formed in the lower part 121 of the refractory coke, and an assembly screw 123 is assembled to the upper part 122 of the refractory coke. In the center of the refractory coke is formed a hole 125 in which the exhaust gas passage and the thermocouple and shrinkage measuring device can be mounted.

5 shows an example of the drop sample collection device 300 of the two-stage vertical high temperature reduction furnace according to the present invention. Referring to FIG. 5, a pair of site glasses 310 are installed facing each other to observe whether a molten sample is dropped, and a preheated reducing gas inlet 320 is formed to reduce gas preheating apparatus through a pipe. It is connected with and it is possible to introduce a reducing gas. The dropping melting sample holder 350 is cylindrical and has a semi-cylindrical sample holder 352 having a partition installed therein, and includes a connecting rod 354, a connecting plate 355, a position indicating rod 351, and a stopper 356. Equipped with. 5 is divided into three compartments, the sample receiving plate 352 by moving the sample receiving plate 352 while watching the position bar 351 is collected by dividing the molten drop sample by time zones, and analyzed the present invention Differential high temperature melting characteristics of the resulting sample can be evaluated.

6 is a schematic view showing a measurement and control device for the first stage electric furnace of the two-stage vertical high temperature reduction furnace according to the present invention. In FIG. 6, the reducing gas inlet temperature 601, the furnace internal temperature 602, the crucible internal temperature 603 can be measured, and the pressure of the compressed air connected to the load applying device can be adjusted 604. The displacement measuring device 605 of the shrinkage measuring device is provided. In addition, the pressure difference between the two nozzles may be measured through the pressure measuring nozzles formed at the reducing gas inlet and the exhaust gas outlet (606). Then, the reducing gas flow rate is automatically controlled from the electric furnace internal temperature 602 measurement result (607).

The present invention has been described in detail by way of examples, but it is merely illustrative for understanding the present invention, and the protection scope of the present invention is defined by the appended claims and is not limited to the above embodiments. Therefore, one of ordinary skill in the art within the scope of the technical idea of the present invention can be implemented in various modifications and equivalent ranges from the above embodiment, but all of them are within the protection scope of the technical idea of the present invention. Will be understood.

1 to 6 will be described a high temperature melting characteristics evaluation and analysis method of iron ore samples using a two-stage vertical high temperature reduction furnace according to the present invention. First, the union clamp connecting the adapter pipe member 150 and the guide conduit connecting member 230 of the second stage electric furnace is dismantled and the second stage electric furnace is moved, and the guide conduit fixing member and the first stage of the first stage electric furnace are removed. Dismantle the union clamp connecting the electric conduit fixing member to lower the crucible, crucible base and crucible support conduit, and then load iron ore and other samples into the first stage electric furnace crucible 113, and reverse the above disassembly. Assembled accordingly and restored to the shape of FIG. After that, the test is conducted in accordance with the normal electric furnace operation, and the softening, melting, fusion, and dropping processes of iron ore and other molten samples can be evaluated and analyzed for melting characteristics at high temperature while changing the reducing gas composition and heating temperature. Can be simulated in

However, in order to measure the shrinkage rate of the sample unlike the operation of the normal electric furnace, after removing the crucible temperature measuring thermocouple on the upper part of the first stage electric furnace and installing the shrinkage rate measuring device, the sample using air pressure or hydraulic pressure is used. The shrinkage rate of the sample according to the change in the applied load can be measured by measuring the displacement while applying a pressure of up to about 2 kPa to the melt test.

In addition, the differential melting characteristics can be evaluated by moving the sample receiver of the dipped sample collection container over time during the test time.

Meanwhile, iron ore or other molten sample is charged into the crucible to the first electric furnace, and a substance capable of reacting with coke and other molten samples is charged to the crucible to the second electric furnace so that the molten sample is secondarily reacted with the coke or other material. Whether or not, the composition after the reaction can be simulated.

Melting tests may be conducted by varying the composition and composition of the reducing gas. For example, by melting N ₂ , H ₂ , CO and CO ₂ gas vessels in parallel to the gas station and adjusting the flow rate of each gas, it is possible to perform a melting characteristic test of iron ore according to the composition and composition of the reducing gas.

Claims (3)

A cylindrical guide conduit having a built-in electric heating element and penetrating vertically through a heating chamber formed of refractory; A circular guide conduit fixing member for fixing the outside, and inserting and closing the upper opening of the cylindrical guide conduit, and an exhaust gas passage is formed along the longitudinal center, and a refractory cock having an air gap formed along the outer circumferential surface thereof. A first stage electric furnace composed of a cap member; Cylindrical guide conduit mounted up and down through the heating chamber formed of a refractory, the electric heating element is built up, a cylindrical crucible supported by a lower support conduit in the cylindrical guide conduit, a perforated plate formed on the bottom, and the cylindrical guide conduit A circular guide conduit fixing member fixed to the outside, a crucible support conduit fixing member attached to a lower end of the support conduit and connected to the guide conduit fixing member, and an electrical connection member attached and mounted to an upper end of the guide conduit And a second stage electric furnace having an upper diameter tapered shape and including an adapter conduit positioned above the crucible in a cylindrical guide conduit and vertically connected and mounted at a lower portion of the first stage electric furnace. Vertical lifting means for separating the first stage electric furnace from the second stage electric furnace; And a semi-cylindrical sample receiver which is mounted under the guide conduit fixing member of the second stage electric furnace, extends in the longitudinal direction, and extends in the longitudinal direction and moves in the longitudinal direction therein, to prevent the outflow of gas. A cylindrical drop sample collection device in which airtightness is maintained; A differential pressure measuring device for measuring a pressure difference between a gas injection hole below the second stage electric furnace and a pressure measuring nozzle respectively installed at the gas outlet above the first stage electric furnace; A gas preheating device connected to a gas inlet under the second stage electric furnace and whose outlet gas temperature is controlled by internal temperatures of the first stage electric furnace and the second stage electric furnace; And It is connected to the cap member of the first stage electric furnace, a two-stage vertical high temperature reduction for melt simulation test characterized in that it comprises an exhaust reaction gas combustion device for oxidizing CO contained in the exhaust gas and cooling the exhaust gas in. The method of claim 1, Each of the guide conduit fixing member, the crucible support conduit fixing member and the cap member of the first stage electric furnace, the guide conduit fixing member, the crucible support conduit fixing member and the electric furnace connecting member of the second stage electric furnace, A plurality of o-rings in contact, the o-rings being secured together with the o-ring retainers, the longitudinal cross section of which has a three-stage staircase shape, characterized in that it comprises a water jacket Two stage vertical high temperature reduction furnace. The method according to claim 1 or 2, The discharge gas passage of the first stage electric furnace cap member includes a ceiling plate, a rod formed vertically on the perforated disc, a load applying device using air pressure provided at an upper end of the rod, and a position change of the rod fixed to the cap member. The two-stage vertical high temperature reduction furnace for melt simulation testing, characterized in that further comprises a shrinkage measuring device composed of a displacement measuring device for measuring a.