JP2007301425A - Apparatus for melting asbestos-containing waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe and compact apparatus capable of making asbestos-containing waste harmless by destroying a fibrous form of asbestos constituted of a minute needle-like structure. <P>SOLUTION: The apparatus for melting asbestos-containing waste is constituted of a feed hopper, a crusher, a heating, drying and transferring device, a melting furnace, a heating chamber, a gas cooler, a dust collector, a HEPA filter, an exhaust fan, a controller, a monitor, a fuel supplier, a tilt adjuster, and other relevant devices. The drying device is disposed in the heating chamber which is disposed inside the melting furnace to utilize waste heat of the melting furnace, whereby the apparatus can be made compact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a melt processing apparatus for safely processing asbestos-containing waste that is said to be easily scattered and has a great effect on health.

  Asbestos has excellent heat resistance and wear resistance and is used in large quantities in building materials and industrial materials. However, asbestos is said to cause serious health problems in the human body and is being removed. However, it is difficult to dispose of it because of its excellent heat and wear resistance. Currently, after cement solidification, it is packed in double bags and landfilled at a managed final disposal site. The melting treatment can make the microneedle structures disintegrate and be harmless. However, the existing facilities are all large-scale and are not easy to install.

  To provide a device that can melt and discharge asbestos-containing waste, which is said to be a serious health hazard to the human body, from the pretreatment, safely melted and discharged without air scattering, and can be downsized. Objective.

  In the present invention, (1) asbestos-containing waste charging hopper shown in FIG. 1 is charged with asbestos-containing waste. Then, while mixing, heating and drying, the asbestos-containing waste is sent to the melting furnace through the heating conveyor, and the melting treatment is performed. (2) Since crushing is performed by a crushing device, (2) Asbestos-containing waste dust generated in the crushing device, and (5) Dust that has become floating mist in a melting furnace, etc. are reliably collected. (12) Environmental protection devices such as bag filters and (16) hepa filters are installed, and these control devices, monitoring devices, fuel supply devices, gradient adjustment devices, and other related devices are included.

  The most dangerous accident caused by a melting furnace is a steam explosion. The steam explosion is caused by water adhering to the waste. In particular, in the case of waste containing asbestos generated during the demolition of buildings, a large amount of water is sprayed during demolition work to prevent air scattering. In the conventional melting furnace, a drying apparatus is installed separately from the melting furnace or drying is performed by a tunnel kiln method, so that it is inefficient and the facilities are very large.

  As a countermeasure against the steam explosion, the present invention performs a crushing process immediately before charging the melting apparatus, and by providing a heating and drying unit in the melting furnace, the residual heat of the melting furnace can be effectively used for the drying process, Realized miniaturization. In addition, asbestos dust is no longer discharged from the inside of the device, and environmental impacts such as atmospheric diffusion are minimal.

Industrial application fields

  The present invention relates to a melt processing apparatus for detoxifying asbestos-containing wastes used in building materials, industrial materials, and the like as heat retaining, soundproofing, heat resistant, and wear resistant materials.

  Examples of the present invention will be described below. In FIG. 1, (1) Asbestos-containing waste is introduced from an asbestos-containing waste input hopper, and (2) is crushed by a crushing device. (4) The asbestos-containing waste drying process on the heating conveyor will be made more efficient by crushing equipment. (2) The crusher is equipped with a dust collector, and (14) fine asbestos dust generated by crushing is sent to the bag filter through the dust collection pipe. Asbestos-containing waste other than dust is transferred to the melting furnace by (4) heating conveyor, (8) passing through the heating chamber. (4) The heating conveyor is preferably made of a heat-resistant material. At this time, if necessary, (3) a flow promoter or the like is added from the auxiliary material input hopper, and (4) is mixed, heated and dried by a heating conveyor. In order to avoid danger, (4) adjust the feeding speed of the heating conveyor according to the wetness of the asbestos-containing waste. (5) is a melting furnace. (7) The melting burner uses (10) air heated by a heat exchanger or a gas enriched with oxygen, burns fuel, and (7) heats the melting furnace. (5) A sump section is installed in the melting furnace, and asbestos-containing waste is charged, melted and stored in the sump section. The stored molten slag is appropriately discharged from the (6) slag discharge port. The exhausted gas was heated in the heating chamber (4) in the heating chamber, (4) heated by the heating conveyor, (9) passed through the exhaust flue, (10) was sent from the combustion gas and (17) combustion air blower by the heat exchanger. Heat exchange air. The heated air is used as combustion air for the melting burner. (10) Heat exchanger (12) In order to adjust the gas temperature at the bag filter inlet, a cooling tower may be used in combination with the heat exchanger. The cooled combustion gas and dust are sent to the bag filter and collected. (12) A heat resistant filter such as ceramic is preferable for the bag filter. In the present embodiment, since {14} the dust collecting pipe is connected immediately before the {12} bag filter, the {12} bag filter includes unmelted asbestos dust. Asbestos monofilament is about 0.02μm, and (12) the bag filter may not be able to collect it. (15) Recool the combustion gas with the cooling air intake damper, and (16) make it a hepa filter. To fully collect asbestos. (18) is an exhaust fan for making the whole interior of the apparatus negative pressure and smoothly melting the apparatus.

  (8) Heating chamber, (9) Exhaust flue, (10) Heat exchanger, (12) Bag filter, Used (16) Hepa filter, Dust inside each pipe, etc. are cleaned as necessary. After replacement, take protective measures such as spraying water and enclosing a plastic bag, and then put it into the asbestos-containing waste charging hopper again and melt it in the same process as above. In particular, (10) Since a large amount of dust accumulates at the bottom of the heat exchanger and (12) at the bottom of the bag filter, in order to prevent atmospheric scattering and human suction during work, It is desirable to install an air suction device etc. and automatically discharge.

  This device can be manufactured in a smaller size than conventional melting equipment, and this device can be mounted on the vehicle and moved to an asbestos-containing waste generation site by an automobile or the like. Molten slag that has been melted and rendered harmless by this equipment can be landfilled in a stable final disposal site as glass scraps and ceramic scraps, and can be recycled as paving materials by installing post-treatment equipment such as water granulation. It can be used and can contribute to the effective use of resources.

The invention's effect

  According to the present invention, miniaturization of the melting equipment can be realized. Downsizing has made it easier to install melting equipment than in the past. Easier installation of melting equipment can be expected to increase the detoxification equipment for waste containing asbestos, enabling final disposal at a stable final disposal site, and installing post-treatment equipment such as water granulation By doing so, it can be reused for paving materials, etc., and can contribute to the effective use of resources. Simultaneously with downsizing, asbestos dust was not discharged from the inside of the device, and the environmental impact such as atmospheric diffusion became minute.

It is a flow sheet which shows an example of the present invention.

Explanation of symbols

(1) Asbestos-containing waste charging hopper (2) Crushing device (3) Secondary material charging hopper (4) Heating conveyor (5) Melting furnace (6) Slag discharge port (7) Melting burner (8) Heating chamber (9) ▼ Exhaust flue ▲ 10 ▼ Heat exchanger ▲ 11 ▼ Heat exchanger dust outlet ▲ 12 ▼ Bug filter ▲ 13 ▼ Bag filter dust outlet ▲ 14 ▼ Dust collection piping ▲ 15 ▼ Cooling air intake damper ▲ 16 ▼ Hepar filter ▲ 17 ▼ Combustion air blower ▲ 18 ▼ Exhaust fan

Claims (3)

An asbestos-containing waste melting apparatus in which a crushing apparatus, a waste supply apparatus, a secondary material supply apparatus, and a transport apparatus are integrated, a drying apparatus is provided in the melting furnace, and asbestos waste is melted in a melting section. The waste supply apparatus used for the asbestos-containing waste melting apparatus according to claim 1. The drying apparatus used for the asbestos-containing waste melting apparatus according to claim 1.

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