KR20030060570A - High Temperature Melting Apparatus for the DC resistance supplying low voltage - Google Patents

Abstract

PURPOSE: A low voltage D.C resistance type high temperature melting apparatus for manufacturing a recyclable material by detoxifying and stabilizing bottom ash and fly ash containing large amount of dioxin and heavy metal raising an issue in the environmental field is provided. CONSTITUTION: The low voltage D.C resistance type high temperature melting apparatus comprises first refractory wall(21) consisting of aluminum oxide (Al2O3) with a melting point of 1,750 to 1,850 deg.C and maintaining melting temperature to house and melt bottom ash and fly ash; second refractory wall(23) consisting of aluminum oxide (Al2O3) with a melting point of 1,550 to 1,650 deg.C for surrounding the first refractory wall to support the first refractory wall; a plurality of insulation layers(25) positioned on the outer surface of the second refractory wall to prevent loss of high heat in the above temperature range and prevent danger applied to an operator; at least one of first carbon rod(31) to which low voltage high current of D.C 10 to 24 V is impressed to provide with melting temperature atmosphere for melting the bottom ash and fly ash housed in a housing space of the first refractory wall; a carbon connecting body(33) depressed into the lower part of the first refractory wall in a certain shape and surface contacted with the first carbon rod to form the ignition point of resistance heat; and second carbon rod(35) removably connected to the carbon connecting body(33) to impress the low voltage high current to the carbon connecting body.

Description

High Temperature Melting Apparatus for the DC resistance supplying low voltage}

The present invention relates to a low voltage DC resistance high temperature melting apparatus, and more particularly, to a low voltage DC resistance for producing recycled materials by making harmless and stabilizing incineration and fly ash containing a large amount of dioxins and heavy metals, which are recently being problematic in the environmental field. It relates to a high temperature type melting apparatus.

Since the 1992 United Nations Conference on Environment, environmental laws have become increasingly stringent in terms of global environmental protection, and efforts are being made to develop new environmental technologies in various countries in preparation for the Green Round. In particular, legal regulations on the treatment of hazardous wastes are being strengthened, and the technology for disposal and disposal of wastes is becoming more diversified and technology development is being made. However, at present, the treatment of incineration ash and fly ash of our country has been processed by landfill which is a simple method. The simple reclamation of incineration ash or fly ash reaches the limit due to the lack of landfill in Korea. In addition, incineration ash or fly ash contains extremely toxic substances such as dioxins and furans, and it is very serious to induce heavy metals and chlorine compounds. Since it causes secondary environmental problems, urgent measures are required.

In order to solve such a problem, a method of solidifying cement has been conventionally attempted, but solidification of cement merely solidifies harmful heavy metals such as dioxins and furans and can fundamentally block harmful substances from leaking. It is not a fundamental solution.

Another conventional technique is a device for melting incineration ash and fly ash using a general arc furnace, which uses an alternating current and three alternating electrodes. If more specifically described by the accompanying drawings, the apparatus for treating incineration ash and fly ash by such an arc as follows.

That is, when the incineration ash and fly ash is injected into the inlet 13, a high-pressure alternating current flows between the lower electrode 12 and the three positive electrode 11, the arc flame occurs, the molten material 19 gradually rises in temperature. As a result, the melting phenomenon occurs, and the molten slag is discharged to the slag discharge port 15 and the exhaust gas is exhausted through the gas discharge port 14.

At this time, non-metals or metals having a melting point of 1,450 ° C. or less among the metal components included in the incineration ash or fly ash remain in the metal layer 16 and are excessively discharged through the metal outlet.

Here, reference numeral 17 denotes a refractory such as a refractory brick or castable.

By the way, since the high voltage current is applied to the three AC electrodes in order to induce the arc that generates high temperature, the unit price due to the high power increases, resulting in high operating costs. There is a problem that the economic burden is increased, the safety due to the high voltage current to harm the manager is a problem, the refractory is frequently damaged due to high voltage and high current has a problem that the life of the melting furnace is rapidly shortened. In addition, when the arc is generated, electromagnetic waves are generated to have a harmful effect on the human body, and thus there are significant problems in health and safety.

In addition, when molten molten metal and molten slag are discharged, molten slag (or molten metal layer) and molten metal (or metal layer) are respectively exposed to the atmosphere while flowing toward the slag outlet and the metal outlet, and are exposed to the atmosphere by room temperature. The slag and metal solidified on each outlet inside and rapidly cooled are gradually deposited and accumulated to a predetermined thickness over time. As such, when the stack is blocked, the outlet is clogged and the molten slag and the molten metal are not discharged. Therefore, the step for recycling is considerably complicated, and various equipment and manpower for drilling the blocked outlet are required.

As a result, there is a problem in that the cost for recycling increases and the productivity is not suitable at the same time the profitability is not met.

The present invention has been made in order to solve the above problems, by applying a relatively low DC voltage to the carbon electrode by electrical resistance to safely and quickly rise to the melting temperature, to discharge the molten slag and molten metal It is an object of the present invention to provide a low-voltage DC resistance high temperature melting apparatus for simplifying the maintenance and management by preventing the solidified metal and slag accumulated at the outlet for the purpose.

Another object of the present invention is to assemble the carbon electrode in a prefabricated manner to quickly maintain and repair.

1 is a cross-sectional view showing a conventional electric resistance melting apparatus,

Figure 2 is a cross-sectional view showing a low voltage DC resistance high temperature melting apparatus according to the present invention,

Figure 3 is a longitudinal cross-sectional view showing a low voltage DC resistance high temperature melting apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

21; First fireproof wall 23; 2nd fireproof wall

25; Thermal insulation layer 26; Slot

27; Gas outlet 29; Aluminum housing

31; First carbon rod 33; Carbon Connector

35; Second carbon rod 37; Metal outlet

39; Slag outlet 41; Secondary carbon layer

The object is, according to the present invention, the first refractory wall of the aluminum oxide (Al ₂ O ₃ ) component having a temperature range of 1750 ℃ to 1850 ℃ and maintains the melting temperature of receiving and melting incineration ash and fly ash, and the first It is enclosed to assist the fireproof wall, the second fireproof wall of the aluminum oxide (Al ₂ O ₃ ) component having a temperature range of 1550 ℃ ~ 1650 ℃, and located on the outer surface of the second fire resistant wall and the temperature range In order to melt the incineration and fly ash contained in the receiving space of the first fireproof wall by applying a plurality of heat insulation layers and a low voltage high current of DC10V to 24V to prevent heat loss to a high temperature of the heat and to prevent a risk to the manager. At least one first carbon rod providing a temperature atmosphere of a melting environment, and a carbon connection recessed in a specific shape at a lower portion of the first fireproof wall and in surface contact with the first carbon rod to form a ignition point of resistance heat It is achieved by a low-voltage DC resistance high temperature melting apparatus comprising a sieve, and a second carbon rod detachably fastened with the carbon connector to apply the low voltage high current.

Here, the lower portion of the first fireproof wall is sequentially divided into a molten metal layer and a molten slag layer, the metal outlet having a predetermined slope on one side of the receiving space, and the slag outlet is provided on the upper side of the metal outlet located on the other side It is desirable to have.

In addition, the outer diameter of each of the outlet is preferably provided with an auxiliary carbon layer for supplying heat of 1300 ℃ or more so that the molten metal and the molten slag is cooled at the outlet and not deposited on the inner diameter surface.

In the auxiliary carbon layer, carbon particles are preferably filled with a predetermined porosity.

On the other hand, it is preferable to generate a high temperature instantaneously due to electrical mismatch between the first carbon rod and the connecting carbon body, and to achieve an electrical match between the connecting carbon body and the second carbon rod.

Hereinafter, a low voltage DC resistance high temperature melting apparatus according to the present invention with reference to the accompanying drawings in detail as follows. Figure 2 is a cross-sectional view showing a low voltage DC resistance high temperature melting apparatus according to the present invention, Figure 3 is a longitudinal sectional view showing a low voltage DC resistance high temperature melting apparatus according to the present invention.

2 and 3, the high temperature melting apparatus is provided with an accommodating space for accommodating incineration ash and fly ash, and has a temperature range of 1750 ° C to 1850 ° C and maintains a melting temperature of melting (Al _2). O ₃₎ first fire-resistant wall 21 and the first and built around it to assist in the refractory wall 21, the aluminum oxide has a temperature range of 1550 ℃ ~ 1650 ℃ of component (Al ₂ O ₃₎ component Located on the second fireproof wall 23 and the outer surface of the second fireproof wall 23, a plurality of heat insulation layers for preventing heat loss to the high heat of the temperature range, and to prevent the risk to the manager ( 25) Here, an inlet 26 for injecting fly ash and incineration ash having a predetermined slope is provided in the upper portion of the accommodation space, and is inclined almost symmetrically with the inlet 26 to discharge the gas in the accommodation space 27. ) Is provided. An aluminum housing 29 is casing on the outer surface of the heat insulating layer 25.

A plurality of DC 10V to 24V low voltage high currents are applied to the accommodating space of the first fireproof wall 21 to provide a temperature atmosphere of a molten environment for melting the incineration ash and fly ash contained in the accommodating space of the first fireproof wall 21. The first carbon rods 31 are arranged so that a molten square region does not occur. That is, the first carbon rods 31 are arranged in the longitudinal direction at regular partition intervals. A lower portion of the first carbon rod 31 is a carbon connector 33 recessed in a specific shape in the lower portion of the first fireproof wall 21 is in surface contact to form a ignition point of resistance heat, the carbon connector A second carbon rod 35 for attaching power to the first carbon rod 31 is detachably fastened to the reference numeral 33.

The receiving space of the first fireproof wall 21 is sequentially separated from the lower region into a molten metal layer, a molten slag layer and a mixed layer, the temperature of the metal layer is relatively high, the slag layer has a relatively low temperature distribution, the mixed layer is It has the effect of thermal insulation so that the temperature distribution of the rapid and slag layers is maintained. At the bottom edge of the first fireproof wall 21, a metal outlet 37 having a predetermined slope is provided at one side of the accommodation space, and the slag outlet 39 is located at the upper side of the metal outlet 37. It is provided toward.

In addition, an auxiliary carbon layer 41 is provided at an outer diameter of each of the outlets 37 and 39 to supply heat of 1300 ° C. or more so that molten metal and molten slag are cooled at the outlet and are not deposited on the inner diameter surface. (41) is filled with relatively small carbon particles having a predetermined porosity. In this case, when the power is applied to the carbon grains, electrical mismatches are generated to generate resistance heat.

Meanwhile, in order to generate the melting temperature of the present invention in a resistive manner, heat is generated at a very high temperature at the point where the first carbon rod 31 and the carbon connector 33 are in contact with each other, which is the first carbon rod 31 and the carbon connection. An electrical mismatch occurs between the sieves 33 and instantaneously generates high heat. That is, the cross-sectional area of the first carbon rod 31 and the resistance value by the cross-sectional area of the carbon connector 33 are formed differently, so that heat of resistance is instantaneously generated and high heat of 1300 ° C. or more is generated. In addition, the end of the first carbon rod 31 may be formed to be somewhat reduced in order to induce mismatch.

However, the electrical connection between the connecting carbon body 33 and the second carbon rod 35 does not generate heat at a high temperature, and is fastened in a screw form for desorption.

The operation of the low-voltage DC resistance high temperature melting apparatus according to the present invention as described above is as follows. First, when the incinerator and fly ash, which are melted products, are injected into the accommodation space of the first fireproof wall 21 through the inlet 26, the first carbon rod 31 is supplied with a starting current and supplied to start the initial operation. . Then, thermal resistance is generated due to electrical mismatch between the end of the first carbon rod 31 and the carbon connector 33 in surface contact, thereby generating high heat instantly. Here, the high heat is a temperature between 400 ℃ ~ 1400 ℃.

As such, the fly ash and the incineration ash received by the high heat generated in the contact surface are gradually melted, and in the molten state, the molten metal is positioned on the bottom surface, a molten slag is disposed thereon, and a mixed layer is disposed thereon. The molten metal is discharged through the metal discharge port 37 located on the bottom surface and the edge of the first fireproof wall 21, and the molten slag is discharged through the slag discharge port 39 located in the upper portion.

The molten metal and the molten slag are discharged to the outlets 37 and 39 penetrating through the first fireproof wall 21, the second fireproof wall 23, and the heat insulating layer 25. In particular, the outer diameters of the outlets 37 and 39 are different. The bubo carbon layer 41 is embedded to prevent the phenomenon of cooling at a relatively low temperature. As the outlets 37 and 39 always maintain a high temperature distribution, molten metal and molten slag are easily formed. Discharged.

The present invention, by applying a relatively low DC voltage to the carbon electrode to the electrical resistance type to safely and quickly rise to the melting temperature to ensure more improved safety to improve the line of life according to the operation, operation and low power The low management cost has the effect of maximizing economic profit pursuant to low cost.

In addition, since the solidified metal and slag are not accumulated at the outlet for discharging molten slag and molten metal, it is easy to maintain and manage, so the operation rate is maximized and the life is improved semi-permanently, which improves convenience and productivity. have.

In addition, since the carbon electrode is prefabricated, the maintenance and repair are quick and easy, and thus the operation rate is hardly reduced due to failure, and the management cost is low, thereby reducing the cost.

Claims (5)

A first fireproof wall of an aluminum oxide (Al ₂ O ₃ ) component having a temperature range of 1750 ° C. to 1850 ° C. and maintaining a melting temperature for accommodating incineration ash and fly ash; A second fireproof wall enclosed to assist the first fireproof wall and having an aluminum oxide (Al ₂ O ₃ ) component having a temperature range of 1550 ° C. to 1650 ° C .; A plurality of thermal insulation layers positioned on an outer surface of the second fireproof wall to prevent heat loss for high heat of the temperature range and to prevent a risk to an administrator; At least one first carbon rod having a low voltage high current of DC 10V to 24V applied thereto to provide a temperature atmosphere of a molten environment for melting the incineration ash and fly ash contained in the accommodating space of the first fireproof wall; A carbon connector formed in a specific shape in the lower portion of the first fireproof wall and in surface contact with the first carbon rod to form an ignition point of resistance heat; And a second carbon rod detachably fastened to the carbon connector to apply the low voltage and high current. The method of claim 1; In the lower region of the first fireproof wall is sequentially divided into a molten metal layer and a molten slag layer, the metal outlet having a predetermined slope on one side of the receiving space, and the slag outlet is provided on the upper side of the metal outlet located on the other side Low voltage DC resistance high temperature melting apparatus. The method of claim 2; Low-voltage DC resistance high temperature melting apparatus characterized in that the outer diameter of each of the outlet is provided with an auxiliary carbon layer for supplying heat of 1300 ℃ or more so that the molten metal and molten slag is cooled at the outlet and is not deposited on the inner diameter surface. The method of claim 3; The auxiliary carbon layer is a low voltage DC resistance high temperature melting apparatus, characterized in that the carbon particles are filled with a predetermined porosity. The method of claim 1; A low voltage DC resistance high temperature melting apparatus, characterized in that to generate a high temperature instantaneously by the electrical mismatch between the first carbon rod and the connecting carbon body, and to achieve an electrical match between the connecting carbon body and the second carbon rod.