JP2008272555A - Device and method for melt-treating asbestos waste material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt-treating device which is compact in composition and cleanly melt-treats asbestos waste materials. <P>SOLUTION: The device for melt-treating asbestos waste materials is provided with; a device main body 10 having the first combustion room 1303 and the second combustion room 1304 formed so that it may surround the first combustion room 1303; a combustion burner 201 which is arranged in the first combustion room 1303 and feeds a heated gas; and a heating container 15 which is arranged in the first combustion room 1303 and accommodates asbestos waste materials. The heating container 15 has a bottom and a tightly closable aperture on its upper part. In the heating container 15, a communication part 1531, which communicates with the upper part of the second combustion room 1304 without communication with the first combustion room 1303, is formed. A combustion gas generated in the first combustion room 1303 is emitted into the second combustion room 1304 through a combustion gas emitting part 1305, and a combustion gas generated in the second combustion room 1304 is emitted outside through a flue 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an asbestos waste melting treatment apparatus and a melting treatment method for detoxifying asbestos waste such as waste material containing asbestos by melting treatment.

  Asbestos is a general term for cotton-like natural minerals composed of fine needle-like crystals, and typical types include chrysotile, crocidolite, and amosite. These have a melting point as high as 1100 ° C. or higher, and the melting point flowing down naturally is even higher.

  Asbestos waste containing these high melting point natural asbestos includes sprayed asbestos and slate boards collected from the demolition site of steel structures and structures, as well as small amounts of automobile brakes and clutches. Abrasion materials such as heat insulation materials such as pipes and machines, packing / sealing materials, and home appliances. Among them, sprayed asbestos accounts for about 90% of all asbestos waste, and its appropriate treatment is an urgent social issue.

As an asbestos waste processing apparatus, a structure that is rendered harmless by melting is known. For example, in the melting processing apparatus disclosed in Patent Document 1, asbestos waste sealed in a storage bag is sequentially pushed into a charging chute by a pushing device and is melted in an electric melting furnace.
JP-A-7-171536

  Asbestos waste that is subject to such melting treatment is sealed in a plastic double bag made of polyethylene or the like so as not to scatter or generate dust around the asbestos during the dismantling site or during transportation after dismantling. In general, it is packed in a container such as a cardboard box. The cardboard includes not only asbestos waste, but also protective work clothes made of paper, rubber work gloves, partition curtains to cut off from the outside, plastic sheets, etc. These are all treated as asbestos waste.

  In other words, asbestos waste contains not only asbestos but also flammable waste such as paper, plastic, rubber, and so on. It is also necessary to consider processing.

  The melting processing apparatus disclosed in Patent Document 1 requires a gas duct having a combustion torch and a dust collector in addition to an electric melting furnace in order to process combustible gas and dust generated with the melting process of asbestos waste. In order to melt asbestos having a high melting point, not only a large electric power is required, but also an increase in the size and cost of the apparatus has been incurred in order to clean the exhaust gas.

  Therefore, an object of the present invention is to provide an asbestos waste melting treatment apparatus and a melting treatment method that can clean the asbestos waste melting treatment with a compact configuration.

  The object of the present invention is an apparatus for detoxifying asbestos waste by melting, and has a first combustion chamber and a second combustion chamber formed so as to surround the first combustion chamber. A combustion burner disposed in the first combustion chamber for supplying heated gas, and a heating container disposed in the first combustion chamber for containing asbestos waste, the heating container having a bottom and hermetically sealed at the top. A communication portion having a possible opening and communicating with the upper portion of the second combustion chamber without passing through the first combustion chamber is formed, and the combustion gas generated in the first combustion chamber emits combustion gas Achieved by an asbestos waste melting apparatus configured to be discharged to the second combustion chamber through a section and the combustion gas generated in the second combustion chamber to be discharged to the outside through a flue Is done.

  In the asbestos waste melting apparatus, it is preferable that the second combustion chamber includes an air supply port for introducing a combustion-supporting gas from the outside.

  The combustion burner is preferably disposed in the first combustion chamber and also in the second combustion chamber.

  Moreover, it is preferable that the said flue is connected to the exhaust port formed in the lower part of the said 2nd combustion chamber, and the combustion burner of the said 2nd combustion chamber is arrange | positioned above the said exhaust port. It is preferable.

  In addition, the heating container has a hollow cylindrical weir material that is formed at the bottom of the bottom and has a discharge port that can discharge the asbestos melt generated by melting the asbestos waste. The bottom surface of the heating vessel is supported by a hollow cylindrical support base disposed in the first combustion chamber, and the asbestos melt flowing down from the discharge port is It can be configured to pass through the inside and be discharged to the outside of the apparatus main body. In this case, the dam member is preferably provided with a covering plate at the upper end, and preferably has a circulation part on the side wall through which the asbestos melt can pass. These heating containers preferably include a graphite crucible integrated with the weir material.

  The heating vessel preferably includes a cylindrical preheating tower protruding above the combustion chamber, and the preheating tower is capable of opening and closing disposed with a charging lid for charging asbestos waste. It is preferable that an asbestos waste be stored between the charging lid and the damper.

  In addition, the object of the present invention is to contain asbestos waste in which borax slurry produced by mixing borax with water is added in the heating container using any of the above asbestos waste melting treatment apparatuses. This is achieved by a method for melting asbestos waste that is heated.

  According to the melt processing apparatus and the melt processing method of asbestos waste of the present invention, the melt processing of asbestos waste can be performed cleanly with a compact configuration.

 Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an asbestos waste melting apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the melt processing apparatus 1 includes an apparatus main body 10, a first combustion burner 201, a second combustion burner 202, and a flue 30 attached to the apparatus main body 10. The apparatus main body 10 is supported by a plurality of support pillars 10a at intervals from the horizontal floor surface F.

  The apparatus main body 10 is configured by lining a refractory material 12 on an iron casing 11, and a space surrounded by the refractory material 12 is a combustion chamber 13. A cylindrical partition wall 1302 is disposed inside the combustion chamber 13, whereby the combustion chamber 13 includes a first combustion chamber 1303 and a second combustion chamber 1304 that surrounds the first combustion chamber 133 2. It has a heavy structure. A plurality of spacers 1306 are disposed along the circumferential direction between the first combustion chamber 1303 and the second combustion chamber 1304, and the interior of the second combustion chamber 1304 is maintained at a predetermined size.

  In the center of the bottom of the first combustion chamber 1303, a passage port 10b communicating with the outside of the apparatus main body 10 is formed, and a hollow cylindrical support base 14 is installed so as to surround the passage port 10b. . A heating container 15 in which asbestos waste is stored is placed on the support base 14.

  An air supply port 132 for introducing combustion air from the outside is formed on the side wall of the second combustion chamber 1304. In the present embodiment, the air supply ports 132 are formed at three substantially equal intervals along the circumferential direction with respect to the combustion chamber 13 having a circular shape in plan view, and are formed in three upper and lower stages at each location. The flow rate of air introduced from each air supply port 132 can be individually controlled by adjusting the opening degree of a valve 132 a installed in a pipe connected to the air supply port 132. In this embodiment, the introduction direction of the combustion air from the air supply port 132 is substantially the same as the radial direction of the combustion chamber 13. However, in order to make a swirl flow easily generated in the combustion chamber 13, the second direction is used. The air supply port 132 may be formed so that air is introduced along the tangential direction of the inner peripheral surface of the combustion chamber 1304.

  The air introduced from the air supply port 132 is not limited to that at room temperature. For example, air heated in advance by heat exchange with the combustion gas exhausted through the exhaust port 131 or other waste heat is introduced. May be. In addition, the formation position and the number of the air supply ports 132 are not limited to the present embodiment, and can be set as appropriate depending on the necessary air introduction amount. Furthermore, when sufficient air can be introduced from the combustion burner 20 described later, the air supply port 132 is not necessarily provided.

  Both ends of the support base 14 are in close contact with the floor surface of the first combustion chamber 1303 and the bottom surface of the heating vessel 15, and prevent outside air from flowing into the first combustion chamber 1303 from the passage port 10 b. A plurality of vertical grooves (or vertical ribs) 14 a extending along the vertical direction are provided on the outer surface of the support base 14 to increase the contact area with the combustion gas generated in the first combustion chamber 133, It is comprised so that the heating efficiency of the heating container 15 by heat conduction may be improved.

  The heating container 15 has a bottom and has an opening 15a at the top, and is preferably made of a material having good thermal conductivity. In this embodiment, the main part is formed by a container body 151 made of a graphite crucible. It is configured. Graphite crucibles are widely used in crucible furnaces for melting non-ferrous metals, mainly composed of scaly graphite and silicon carbide, with high thermal conductivity, and excellent oxidation resistance, heat resistance, thermal shock resistance, and chemical properties. -Has physical corrosion resistance and exhibits excellent durability over a wide temperature range from low to high.

  At the bottom of the container main body 151, a discharge port 1511 capable of discharging the asbestos melt generated by melting the asbestos waste is formed. The discharge port 1511 is surrounded by a hollow cylindrical weir material 1512 fixed to the bottom of the container main body 151. The weir 1512 has a flow part 1513 through which the asbestos melt can flow out at the upper part of the side wall, and when the asbestos melt is stored in the container body 151 to some extent, the container body from the discharge port 1511 through the flow part 1513. 151 is discharged to the outside. As a result, the liquid level L of the asbestos melt is held at a constant height below the flow portion 1513.

  The upper end of the weir 1512 is covered with a cover plate 1514, so that the unmelted asbestos waste put into the heating container 15 is clogged inside the weir 1512 or falls from the discharge port 1511. It is preventing. The covering plate 1514 is not necessarily provided, and in this case, the upper end opening of the weir material 1512 can function as the circulation portion 1513.

  The container body 151 provided with such a dam member 1512 may be bonded and fixed to the container body 151 later, or the container body 151 made of a graphite crucible is made of a heat-resistant material such as a graphite crucible material. An irregular graphite crucible in which the weir material 1512 is integrated in advance may be used.

  Further, the heating container 15 includes a holding body 152 that is detachably fixed to the upper surface of the apparatus main body 10 above the container main body 151. The holding body 152 is a ring-shaped member whose upper surface center protrudes upward, and a gap is formed between the lower surface of the holding body 152 and the upper end of the partition wall 1302. A ring-shaped flange portion 1511 is fixed to the upper end of the container main body 151, and the outer edge portion of the flange portion 1511 extends to the second combustion chamber 1304 via the gap. Accordingly, a communication portion 1531 that communicates the inside of the heating container 15 and the second combustion chamber 1304 is formed between the flange portion 1511 and the holding body 152, and the first portion is formed between the flange portion 1511 and the partition wall 1302. A combustion gas discharge portion 1305 that communicates between the combustion chamber 1303 and the second combustion chamber 1304 is formed.

  The communication portion 1531 directly communicates with the second combustion chamber 1304 without passing through the first combustion chamber 1303, and a ring-shaped filter 1531a is disposed so as to be replaceable. Examples of the filter 1531a include a breathable member in a bulk shape, a felt shape, a sheet shape, and a mesh shape made of a ceramic fiber and the like, and discharge of dust and ash can be prevented. The communication portion 1531 is preferably formed so as to directly communicate with the upper portion of the second combustion chamber 1304, but the shape is not necessarily limited to that of the present embodiment. For example, it may be configured by a plurality of grooves and through holes formed in the flange portion 1511 so as to extend in the radial direction, or the communication portion 1531 may be configured by a plurality of pipe-like members that penetrate the side wall of the heating container 15. it can. The size and number of the communication portions 153 are not particularly limited, but are preferably as small as possible so that dust, ash, and the like generated in the heating container 15 are not discharged, and the number is preferably the minimum necessary. Further, a baffle plate or the like may be attached as necessary near the periphery of the communication portion 153 so that dust ash and the like in the container main body 151 are not scattered by the flow of combustion gas generated in the combustion chamber 13.

  The discharge port 1511 formed in the container main body 151 coincides with the passage port 10b formed in the apparatus main body 10 in a plan view, and the asbestos melt flowing down from the discharge port 1511 passes through the passage port 10b, It is accommodated in a collection container V arranged below.

  The first combustion burner 201 and the second combustion burner 202 are arranged at the lower part of the first combustion chamber 1303 and the upper part of the second combustion chamber 1304, respectively. The first combustion burner 201 and the second combustion burner 202 have a known configuration including a pilot burner that performs preliminary combustion and a main burner that performs main combustion. The combustion load and the combustion temperature can be controlled by appropriately adjusting the flow rates (air ratios) of the fuel and the combustion air that are respectively supplied.

  The first combustion burner 201 is inserted into the combustion pipe 201 a that penetrates the partition wall 1302 from the outside of the apparatus body 10 and faces the first combustion chamber 133, and the generated combustion gas flows around the heating container 15. The heating vessel 15 is arranged so as to rise while turning and be discharged from the combustion gas discharge portion 1305 to the second combustion chamber 1304 in the tangential direction of the heating container 15 and slightly upward from the horizontal direction. On the other hand, the second combustion burner 202 is provided at a lower position than the communication portion 153 in the upper part of the second combustion chamber 1304, and the generated combustion gas swirls around the partition wall 1302 from the exhaust port 131. In order to be discharged, it is arranged in the tangential direction of the partition wall 1302 and slightly downward from the horizontal direction. Stirring plates and the like may be provided inside the first combustion chamber 1303 and the second combustion chamber 1304 as necessary to promote the stirring and mixing of the combustion gas.

  In the present embodiment, the first combustion burner 201 and the second combustion burner 202 are disposed in the first combustion chamber 1303 and the second combustion chamber 1304, respectively, but the combustion generated in the first combustion chamber 1303 The second combustion burner 202 is not necessarily required if combustion in the second combustion chamber 1304 is possible with gas.

  The flue 30 is formed such that a pipe extending horizontally from the exhaust port 131 is bent and extends vertically upward, and a diameter-expanded portion 31 having an enlarged cross-sectional area is formed in a part of the flue 30. ing. A second auxiliary capable of supplying combustion air from a pressurized air supply source (not shown) such as a blower between the exhaust port 131 and the enlarged diameter portion 31 (that is, upstream of the enlarged diameter portion 31). An air supply pipe 32 is provided. One or a plurality of air supply ports 321 are formed at the tip of the second auxiliary air supply pipe 32, and by adjusting the opening of the control valve 322 interposed in the middle of the second auxiliary air supply pipe 32, Combustion air can be supplied to the flue 30 at a desired flow rate. A sealed opening / closing door 301 for cleaning is provided at the bent portion of the flue 30.

  A plurality of baffle plates 311 are arranged in the enlarged diameter portion 31 along the vertical direction. Combustion gas introduced from the exhaust port 131 and combustion air introduced from the second auxiliary air supply pipe 32. Are sufficiently mixed and stirred inside the enlarged diameter portion 31 and the residence time is secured.

  The heating container 15 includes a preheating tower 40 having a cylindrical tower body 41. The preheating tower 40 includes a roller 401 at a lower portion, and is movable on a rail 402 disposed along the upper surface of the apparatus main body 10 in the penetrating direction of the drawing. The lower end of the tower main body 41 can be tightly fixed to the upper end of the holding body 152 by a fixing means (not shown) in a state where the lower end is moved right above the holding body 152. Thereby, the preheating tower 40 seals the opening 15a of the heating container 15 in a state of protruding upward from the combustion chamber 13.

  A cylindrical charging portion 42 whose axis extends obliquely upward is provided on the upper portion of the tower body 41. The charging part 42 is provided with a charging lid 42 a for charging asbestos waste at the tip, and the charged asbestos waste is guided to the tower body 41 along the inclined inner peripheral surface of the charging part 42. The An openable and closable damper 43 is provided between the tower main body 41 and the input portion 42. When the damper 43 is closed as shown by a solid line in FIG. 1, the input portion 42 is cut off from the tower main body 41. In the state where the damper 43 is opened as indicated by a broken line, the inside of the tower main body 41 communicates with the inside of the input portion 42. A storage portion 42b capable of storing asbestos waste is formed between the input lid 42a and the damper 43 in a state where the damper 43 of the input portion 42 is closed.

  In addition, a heat-resistant camera 46 for observing the combustion state in the heating container 15 is provided on the upper portion of the tower main body 41. The heat-resistant camera 46 can be a CCD camera or the like, and is arranged so as to image the inside of the heating container 15 to check the remaining amount of waste in the heating container 15 and the state of dissolution / gas generation. can do.

  Each supply port 132 of the second combustion chamber 1304 and the combustion supply pipe 22 of the first combustion burner 201 and the second combustion burner 202 are connected to a pressurized air supply source such as factory air or a blower, respectively. Is done. These may be individually connected to a plurality of pressurized air supply sources, or may be branched from the same pressurized air supply source.

  Next, a method for melting and detoxifying asbestos waste using the melting apparatus 1 configured as described above will be described. First, the first combustion burner 201 is operated to sufficiently heat the heating container 15 in advance. Next, the closing lid 42a is opened with the damper 43 of the preheating tower 40 closed (indicated by a solid line in FIG. 1), and the asbestos waste is stored in the storage portion 42b, and the closing lid 42a is sealed. And if the damper 43 is open | released (state shown with a broken line in FIG. 1), the stored asbestos waste will fall in the heating container 15 through the opening 15a. The asbestos waste to be input may include not only asbestos waste but also combustible waste such as plastic, paper, rubber, wood, and the like.

  As the combustion temperature by the first combustion burner 201, it is necessary to melt the high melting point asbestos waste material contained in the asbestos waste, so it is preferable to perform high temperature combustion at an air fuel ratio close to the stoichiometric air fuel ratio. The temperature of the first combustion chamber 1303 is adjusted to a desired temperature by adjusting the combustion amount by on / off control of the main burner and the pilot burner in the first combustion burner 201 while monitoring with a temperature sensor (not shown). For example, it is preferable to set the temperature to 1300 to 1500 ° C. The upper limit of the combustion temperature is determined in consideration of the heat resistance of the material used. For example, when a graphite crucible is used as the container body 151 as in this embodiment, a high temperature use of about 1500 ° C. is possible. And is particularly suitable for melting asbestos waste. In this way, the asbestos waste material accommodated in the container main body 151 is melted, and the asbestos melt is stored in the container main body 151. As the asbestos waste material melts, the liquid level L of the asbestos melt rises, and the asbestos melt flows down from the circulation portion 1513 through the discharge port 1511. The asbestos melt that has flowed down passes through the passage 10b of the apparatus body 10 and is stored in the recovery container V.

  On the other hand, the combustible waste contained in the asbestos waste that has fallen into the heating container 15 becomes gaseous and is released into the heating container 15, and a part of it burns in the heating container 15. The inside of the combustion chamber 13 including the first combustion chamber 1303 and the second combustion chamber 1304 has a negative pressure due to the high-temperature combustion gas rising up the flue 30 through the exhaust port 131. The remaining unburned gas is led out from the communication portion 1531 to the second combustion chamber 1304. The first combustion chamber 1303 joins and mixes with the combustion gas led to the second combustion chamber 1304 via the combustion gas discharge unit 1305, and is completely combusted in the second combustion chamber 1304. Since the second combustion chamber 1304 is provided with the second combustion burner 202 and the air supply port 132, when the combustion temperature or the amount of air is insufficient, the operation of the second combustion burner 202 is performed as necessary. In addition, by introducing air from the air supply port 132, complete combustion in the second combustion chamber 1304 can be performed more reliably. In the present embodiment, the second combustion burner 1304 is disposed above the exhaust port 131, and the combustion gas injected from the second combustion burner 1304 swirls along the wall surface of the combustion chamber 13, The unburned gas can be sufficiently stirred in the second combustion chamber 1304, and the combustion time of the unburned gas in the second combustion chamber 1304 can be sufficiently secured. Therefore, also from this point, the complete combustion of the unburned gas in the second combustion chamber 1304 can be promoted, the exhaust can be maintained in a clean state, and the discharge of smoke, odor, dust ash and the like can be surely prevented. .

  Even if the operation of the second combustion burner 202 is necessary immediately after the start of the operation, the heating container 15 is sufficiently heated and unburned gas is continuously supplied from the heating container 15 to the second combustion chamber 1304. In the situation, the high-temperature combustion gas generated by the first combustion burner 201 enables complete combustion in the second combustion chamber 1304, and the amount of combustion in the second combustion burner 202 can be reduced. For example, the main burner of the second combustion burner 202 may be stopped and only the pilot burner may be burned, or the fuel supply to the second combustion burner 202 is stopped and the second combustion burner 202 is stopped. Only air at room temperature may be supplied. At this time, the opening degree of the valve 132a of the air supply port 132 can be adjusted to control the inside of the second combustion chamber 1304 to have an optimum air-fuel ratio. In particular, when the asbestos waste includes a material having a high heat quantity such as a PET resin or a vinyl chloride resin, a large amount of self-combustion heat is obtained. Therefore, the fuel consumed by the second combustion burner 202 is reduced by thermal recycling. While being able to reduce, the high temperature exhaust gas discharged | emitted from the discharge port 131 can be utilized effectively for a boiler, drying, etc. As described above, the melt treatment apparatus of the present embodiment can not only efficiently dissolve asbestos waste, but also can effectively recover the combustion heat of combustible waste as a resource, and can be applied by creating thermal energy. .

  The gas introduced into the combustion chamber 13 from the air supply port 132 may be other combustion-supporting gas such as oxygen in addition to air, and thereby complete combustion in the combustion chamber 13 can be promoted.

  Thus, according to the melt processing apparatus 1 of the present embodiment, in the first combustion chamber 1303, the unburned gas generated in the heating container 15 is not supplied, and combustion does not necessarily have to be completed. The heating efficiency of the container main body 151 by the first combustion burner 201 can be increased. On the other hand, in the second combustion chamber 1304, the unburned gas generated in the heating container 15 merges with the combustion gas generated in the first combustion chamber 1303, and complete combustion is promoted. Therefore, clean combustion can be achieved while efficiently performing the melting and detoxifying process of a high melting point metal such as asbestos waste.

  After confirming the flow of the asbestos melt from the discharge port 1511, the asbestos waste can be removed by appropriately re-entering asbestos while observing the heat-resistant camera 46 so as to maintain an appropriate state of asbestos waste. A continuous melting process can be performed, and the harmless asbestos melt can be continuously recovered.

  In the present embodiment, by providing the weir 1512 in the heating container 15, a certain amount of asbestos melt is constantly stored, so that the asbestos waste charged is immersed in the asbestos melt, Melting processing can be performed efficiently. Further, by storing the asbestos melt, it is possible to stably flow down the asbestos melt from the discharge port 1511. Therefore, the discharge port 1511 can be constantly filled with the asbestos melt, Release of unburned gas from the outlet 1511 can be prevented.

  Asbestos waste is introduced by opening the closing lid 42a with the damper 43 closed, and closing the closing lid 42a and then opening the damper 43, thereby dropping the asbestos waste into the heating container 15. As described above, when asbestos waste is charged, the damper 43 is always closed, thereby preventing unburned gas from being released due to the opening of the charging lid 42a. The opening / closing of the damper 43 may be configured to be mechanically interlocked with the opening / closing of the charging lid 42a, thereby reliably preventing the release of unburned gas.

  As mentioned above, although one Embodiment of this invention was explained in full detail, the specific aspect of this invention is not limited to the said embodiment. For example, in the above-described melting treatment of asbestos waste, in order to facilitate melting of asbestos waste, the melting point of asbestos waste is lowered by adding a borax slurry produced by mixing borax into water to asbestos waste. In this case, the temperature of the first combustion chamber 1303 can be decreased to 1000 to 1300 ° C., for example.

  As the amount of borax contained in the borax slurry to be added increases, the melting point decreases and the asbestos waste is easily melted. On the other hand, the processing efficiency of the asbestos waste may be reduced and the durability of the heating container may be impaired. Therefore, for example, a borax slurry in which borax is uniformly mixed with water at a weight ratio of water: borax = 1: 0.5-3 is used as an asbestos waste: borax slurry = 1: 0.5-2 weight ratio. It is preferable to add to asbestos waste. Examples of the method of adding the borax slurry to the asbestos waste include immersion of the asbestos waste in the borax slurry, spraying of the borax slurry onto the asbestos waste, and the like. Note that such addition of borax slurry to asbestos waste is also effective for preventing asbestos scattering.

  When the container main body 151 of the heating container 15 is constituted by a graphite crucible, the graphite crucible has excellent corrosion resistance. Therefore, it is particularly preferable in the above asbestos waste melting method in which borax slurry is added to asbestos waste.

  In the present embodiment, the asbestos melt generated in the heating container 15 is discharged from the discharge port 1511 formed in the bottom of the container main body 151, but on the side wall of the container main body 151. You may comprise so that asbestos melt may be discharged | emitted outside through the connected discharge flow path. For example, an asbestos melt in which the discharge flow path is stored in the container main body 151 by integrating the discharge flow path that leads out from the side wall and guides the container main body 151 to the outside while adjoining the side wall. Since the heat transfer is received, the clogging due to cooling of the discharge channel can be prevented. Furthermore, the asbestos melt can also be discharged by tilting the apparatus body 10 after the end of the melting process or taking out the heating container 15 without providing a discharge part in the heating container 15.

  Further, as shown in FIG. 3, auxiliary air supply means 17 for introducing a combustion-supporting gas such as air, preheated air, or oxygen may be provided in the heating container 15. In FIG. 3, the auxiliary air supply means 17 includes an auxiliary air supply pipe 170 connected to a pressurized air supply source (not shown) such as a blower, and the front end of the auxiliary air supply pipe 170 is a side wall of the preheating tower 40. And extends to the lower part of the preheating tower 40. One or more auxiliary air inlets 171 are formed at the distal end of the auxiliary air supply pipe 170, and the combustion air is heated by adjusting the opening of the control valve 172 interposed in the middle of the auxiliary air supply pipe 170. The inside 15 can be supplied at a desired flow rate. The auxiliary air supply pipe 170 is configured to be removable at the flange portion 173. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals.

  By supplying combustion air into the heating container 15 using such auxiliary air supply means 17, unburned gas generated from asbestos waste can be actively combusted in the heating container 15, The second combustion chamber 1304 can be made small, and the apparatus can be made compact.

It is sectional drawing of the melt processing apparatus which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is sectional drawing of the fusion processing apparatus which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Melt treatment apparatus 10 Apparatus main body 13 Combustion chamber 1303 1st combustion chamber 1304 2nd combustion chamber 1305 Combustion gas discharge part 132 Supply port 14 Support stand 15 Heating container 15a Opening 1511 Discharge port 1512 Weir 1515 Flowing part 1514 Cover plate 1531 Communication unit 201 First combustion burner 202 Second combustion burner 30 Flue 40 Preheating tower 42a Input lid 42b Storage unit 43 Damper

Claims (9)

An apparatus for detoxifying asbestos waste by melting treatment,
An apparatus body having a first combustion chamber and a second combustion chamber formed so as to surround the first combustion chamber;
A combustion burner disposed in the first combustion chamber for supplying heated gas;
A heating container disposed in the first combustion chamber and containing asbestos waste;
The heating container has a bottomed and sealable opening at the top, and a communication portion is formed that communicates with the top of the second combustion chamber without passing through the first combustion chamber.
The combustion gas generated in the first combustion chamber is discharged to the second combustion chamber via a combustion gas discharge unit, and the combustion gas generated in the second combustion chamber is discharged to the outside via a flue. Asbestos waste melting apparatus configured to be used. 2. The asbestos waste melting apparatus according to claim 1, wherein the second combustion chamber includes an air supply port for introducing a combustion-supporting gas from the outside. The asbestos waste melting apparatus according to claim 1, wherein the combustion burner is disposed in the first combustion chamber and also in the second combustion chamber. The flue is connected to an exhaust port formed in a lower part of the second combustion chamber,
The asbestos waste melting apparatus according to claim 3, wherein the combustion burner of the second combustion chamber is disposed above the exhaust port. The heating container includes a hollow cylindrical weir material that is formed at the bottom with a discharge port that can discharge asbestos melt generated by melting asbestos waste and is disposed so as to surround the discharge port. And
The bottom surface of the heating vessel is supported by a hollow cylindrical support placed in the first combustion chamber,
The asbestos waste according to any one of claims 1 to 4, wherein the asbestos melt flowing down from the discharge port passes through the inside of the support base and is discharged to the outside of the apparatus main body. Melt processing equipment. 6. The asbestos waste melting apparatus according to claim 5, wherein a covering plate is provided at an upper end of the weir material, and a circulation part through which the asbestos melt can pass is formed on a side wall. The asbestos waste melting apparatus according to claim 5 or 6, wherein the heating container includes a graphite crucible in which the weir material is integrated. The heating vessel includes a cylindrical preheating tower protruding above the combustion chamber,
The preheating tower includes a charging lid for charging asbestos waste and an openable / closable damper disposed therein, and is configured to store asbestos waste between the charging lid and the damper. The asbestos waste melting apparatus according to any one of claims 1 to 7. A method for melting asbestos waste using the asbestos waste melting apparatus according to any one of claims 1 to 8,
A method for melting asbestos waste in which asbestos waste added with borax slurry produced by mixing borax with water is placed in the heating container and heated.

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