JP2011212517A - Waste incineration fly ash treatment apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste incineration fly ash treatment apparatus and method using no electric power energy and enhanced in carbon dioxide-discharge-amount reducing effect.SOLUTION: The waste incineration fly ash treatment apparatus heats dioxins contained in the fly ash discharged from a waste treatment furnace for incinerating or gasifying/melting waste to volatilize and remove the same. The apparatus includes: a stirring and fluidizing heater 10 for receiving the fly ash and heating gas to stirr and fluidize the fly ash and heating the fly ash by the heating gas; a fly ash heater 20 for heating the fly ash in the stirring and fluidizing heater by the heat exchange with a heating medium; a solar heat collector 40 for collecting solar heat; a solar heat receiving heating medium heater 30 for receiving the solar heat from the solar heat collector 40 to heat the heating medium by the solar heat to thereby send the heating medium to the fly ash heater 20; and a solar heat receiving heating gas heater 50 for receiving the solar heat from the solar heat collector 40 to heat the heating gas by the solar heat and sending the heating gas to the stirring and fluidizing heater 10.

Description

  The present invention relates to a waste incineration fly ash treatment apparatus and method for heating and distilling off dioxins contained in fly ash discharged from a waste treatment furnace that burns or gasifies and melts waste.

  As a waste disposal technology, there are stoker-type incinerators and fluidized-bed incinerators that supply waste such as municipal waste and shredder dust onto a grate, burn the waste, and discharge ash from the combustion residue. There are a method of using and a method of using a gasification melting furnace in which waste is pyrolyzed to generate a combustible gas, and the pyrolysis residue is melted and discharged as slag. In the present invention, the waste incinerator and the waste gasification melting furnace are collectively referred to as a waste treatment furnace.

  In either method, fly ash contained in the exhaust gas discharged from the waste treatment furnace is collected by a filtration dust collector (bag filter). Since fly ash contains dioxins, for example, Patent Document 1 discloses a fly ash heat treatment apparatus that heats fly ash to detoxify the dioxins for detoxification.

  The heat treatment apparatus for fly ash disclosed in Patent Document 1 has a vertical container for containing fly ash, and a fly ash inlet and a gas exhaust are provided on the upper part of the vertical container. In the lower part, a treated fly ash outlet and a gas inlet are provided. A dispersion plate for dispersing the gas from the gas inlet is provided at the bottom of the container. Further, a heater for heating the inside of the container is provided on the outer periphery of the container, and a stirring blade for stirring fly ash is also provided in the inside. The heater receives heat and generates heat.

Japanese Patent No. 3465708

  However, in the fly ash heat treatment apparatus of Patent Document 1, the internal fly ash is heated by the electric heater from the outer surface of the heating container, so an external power source is required and power is consumed. Such power consumption has recently been unfavorable from the viewpoint of reducing carbon dioxide emissions, and conversion of energy sources is required.

  In view of such circumstances, an object of the present invention is to provide an apparatus and a method for reducing the amount of carbon dioxide emissions without using power energy in a waste incineration fly ash treatment apparatus and method.

  The waste fly ash treatment apparatus according to the present invention volatilizes and removes dioxins contained in fly ash discharged from a waste treatment furnace that incinerates or gasifies and melts waste.

  In such a waste fly ash treatment apparatus, the present invention includes a stirring fluid heater that receives fly ash and heating gas, stirs and flows the fly ash, and heats the fly ash with the heating gas, and the stirring fluid heating by the heating medium. A fly ash heater that heats the fly ash in the container by heat exchange with the heat medium, a solar heat collector that collects solar heat, and the solar heat from the solar heat collector that heats the heat medium with the solar heat The solar heat receiving heat medium heater that is sent to the fly ash heater and the solar heat that receives the solar heat from the solar heat collector, heats the heating gas with the solar heat, and sends the heating gas to the stirring fluid heater And a heat receiving gas heater.

  In the present invention, the agitating fluid heater has, for example, a vertical cylindrical container, and is provided with a gas discharge port and a fly ash supply port at the upper part of the vertical cylindrical container, and at the lower part, heating that causes the fly ash to flow. A gas inlet, a dispersion plate, and a treated fly ash removal outlet are provided, and a stirring blade is provided inside the container, and the fly ash in the vertical cylindrical container is heated while stirring and flowing.

  The fly ash heater for heating the fly ash in the stirring fluid heater with a heat medium is provided on the outer periphery or inside of the vertical cylinder container, and the vertical cylinder is exchanged by heat exchange with the heated circulating heat medium. Heat the fly ash inside the container.

  This heat medium is heated using solar heat. Solar heat is obtained by a solar heat collector, and then the solar heat is heated by the solar heat receiving heat medium heater, the heating medium supplied to the fly ash heater, and by the solar heat receiving gas heater, The gas to the stirred fluid heater is also heated.

  According to the apparatus of the present invention configured as described above, the fly ash receives the fly ash and the heating gas, stirs and flows the fly ash, and heats the fly ash with the heating gas, and the heating medium performs the above-described operation. The fly ash heating step for heating the fly ash in the stirring fluid heating step by heat exchange with the heat medium, the solar heat collection step for collecting solar heat, the solar heat to heat the heat medium with the solar heat, and the heat A solar heat receiving heat medium heating step for heating fly ash in the fly ash heating step with a medium, a heating gas is heated by the solar heat upon receiving solar heat, and the heated gas is sent to the fly ash in the stirring flow heating step And a solar heat receiving gas heating step.

  Since the fly ash and the flowing gas are heated using solar heat, the fly ash can be detoxified without using electric energy, and the carbon dioxide emission reduction effect is obtained.

It is a schematic block diagram of the apparatus of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, the code | symbol 10 is a stirring flow heater. The stirring fluid heater 10 is provided with a stirrer 12 in a vertical cylindrical container 11. The stirrer 12 includes a rotating shaft body 14 driven by a motor 13 and a plurality of rotating blades 15 extending from the rotating shaft body 14 in the radial direction. A dispersion plate 16 of a gas permeable member is provided at the lower part of the container 11, and a processing fly ash extraction pipe 17 that protrudes downward from the bottom wall of the container 11 extends from the central part thereof. A bag filter device 18 is provided on the upper wall of the container 11. The container 11 is configured such that fly ash from a waste treatment furnace (not shown) is charged on the upper wall side, and on the bottom wall side, described later in the space below the dispersion plate 16. A supply of heated gas is received. The heated gas permeates and rises through the dispersion plate 16 to diffuse into the fly ash in the container 11 and cause the fly ash to flow.

  A dioxin decomposition reactor 19 is connected to the bag filter device 18 so that the gas generated by the fly ash treatment in the container 11 is made harmless by the decomposition of the dioxins after dust is removed by the bag filter. As a result, it is discharged as a processed gas.

  A fly ash heater 20 having a heat medium pipe 22 in an annular cylinder 21 is disposed around the container 11 of the agitating fluid heater 10. The inner cylinder of the annular cylinder 21 is made of a highly heat-conductive material and is shared with the body of the container 11 of the stirring and flow heater 10, and the heat medium flowing through the heat medium pipe 22. Heat is transferred favorably to the fly ash in the container 11.

  The fly ash heater 20 is connected to a solar heat receiving heat medium heater 30, and the heat medium pipe 22 passes through the annular cylinder 21 through the pump 23, the solar heat receiving heat medium heater 30, and the like. A circulation path is formed. The solar heat receiving heat medium heater 30 is connected to the solar heat collector 40 so as to receive the solar heat collected by the solar heat collector 40.

  The solar heat from the solar heat collecting device 40 heats the heat medium in the heat medium pipe 22 that passes through the solar heat receiving heat medium heater 30.

  The solar heat collecting device 40 is connected to supply solar heat to a solar heat receiving gas heater 50 that heats a heating gas such as air. The solar heat receiving gas heater 50 heats air or the like as a heating gas sent by the blower 51 with solar heat from the solar heat collecting device 40, and then heats the bottom of the agitating fluid heater 10 as a heating gas. To the lower space of the container 11.

  Next, each device relating to the use of solar heat in the present invention will be described in more detail.

<Solar heat collector>
The solar heat collecting apparatus 40 is configured to collect solar heat, and includes, for example, a plurality of reflecting mirrors and a converging reflecting mirror having a parabolic cross section for converging reflected sunlight. The sunlight reflected by the reflecting mirror is condensed by the convergent reflecting mirror, and the converged sunlight is efficiently irradiated by irradiating the heat receiving portions of the solar heat receiving heat medium heater 30 and the solar heat receiving gas heater 50. Solar heat is collected and received.

<Solar heat receiving heat medium heater>
The solar heat receiving heat medium heater 30 is configured such that the heat medium supplied to the fly ash heater 20 and heating the fly ash is heated by the solar heat collected by the solar heat collector 40.

  The solar heat receiving heat medium heater 30 has a heat receiving portion for circulating the heat medium therein, and heats the heat medium by the collected solar heat. The surface of the solar heat receiving heat medium heater 30 is covered with transparent glass, transparent quartz or the like, and heat loss due to staying heat transfer can be suppressed by evacuating the space between the transparent glass or the like and the heat receiving portion. In addition, the surface of the heat receiving part is coated with black paint or has an uneven mirror surface structure so that radiation heat transfer loss can be suppressed, and the amount of heat received from the solar heat collector 40 is maximized. And minimizing heat loss.

  A heat storage material is provided in the solar heat receiving heat medium heater 30 to receive the collected solar heat from the solar heat collecting device 40 to heat the heat storage material, and the heating medium is brought into contact with the heated heat storage material for heating. Also good.

<Solar heat receiving gas heater>
The solar heat receiving gas heater 50 uses at least one of air, a part of exhaust gas discharged from the waste treatment furnace, nitrogen, water vapor, and the like as the gas supplied to the agitating fluid heater 10 to flow fly ash. And is configured to be heated by solar heat collected by the solar heat collector 40.

  This solar heat receiving gas heater 50 has a heat receiving portion for circulating gas therein, and heats the gas by the collected solar heat. The surface of the solar heat receiving gas heater 50 is covered with transparent glass, transparent quartz, or the like, and the space between the transparent glass or the like and the heat receiving part is evacuated, thereby suppressing heat loss due to staying heat transfer. In addition, the surface of the heat receiving part is coated with black paint or has an uneven mirror surface structure so that radiation heat transfer loss can be suppressed, and the amount of heat received from the solar heat collector 40 is maximized. And minimizing heat loss.

  The solar heat receiving gas heater 50 may heat the gas directly by the solar heat received from the solar heat collecting device 40 as described above, or may heat the gas via a heat medium.

  A heat storage material may be provided in the solar heat receiving gas heater 50 to receive the collected solar heat from the solar heat collecting device 40 to heat the heat storage material, and the heated heat storage material may be brought into contact with the gas and heated. .

  In the present embodiment apparatus, using the solar heat in this way, the fly ash in the stirring fluid heater 10 is heated by the fly ash heater 20 and is also heated and heated by the heated gas blown from below. The mixture is stirred by the rotation of the stirring blade 15 and heated while being efficiently stirred and flowed.

  When dioxins contained in the fly ash are heated to 350 to 550 ° C., they are vaporized and removed from the fly ash, and the vaporized dioxins are transferred by a flowing gas and discharged from a gas discharge port. The treated fly ash from which dioxins are removed is discharged from the treated fly ash discharge port. The discharged gas containing dioxins is guided to the bag filter 18 to remove dust, and the dioxins are decomposed in a dioxins decomposition reactor filled with a dioxins decomposition catalyst, and are discharged as a processed gas.

  In this embodiment apparatus, the heat medium heated by solar heat is supplied to the fly ash heater to heat the fly ash in the stirring fluid heater, but the solar heat collected by the solar heat collector is stirred and fluidized by the heater. The fly ash may be directly heated by being incident on the inside. In that case, a material that transmits solar heat, such as quartz glass, is used for the solar heat incident part of the stirring flow heater, and the fly ash adheres to the inner surface (fly ash side) of the solar heat incident. It is preferable to provide a mechanism for flowing a purge gas in order to prevent obstruction.

DESCRIPTION OF SYMBOLS 10 Stir flow heater 20 Fly ash heater 30 Solar heat receiving heat medium heater 40 Solar heat collecting device 50 Solar heat receiving gas heater

Claims (2)

In waste fly ash treatment equipment that heats and distills off dioxins contained in fly ash discharged from a waste treatment furnace that incinerates or gasifies and melts waste,
A stir flow heater for receiving fly ash and heated gas to stir and flow the fly ash and heating the fly ash with a heated gas;
A fly ash heater that heats the fly ash in the stirring fluid heater by heat exchange with the heat medium by a heat medium;
A solar heat collector for collecting solar heat;
A solar heat receiving heat medium heater that receives solar heat from a solar heat collector and heats the heat medium with the solar heat and sends it to the fly ash heater;
A solar heat receiving gas heater that receives solar heat from a solar heat collector, heats the heating gas with the solar heat, and sends the heated gas to the stirring fluid heater;
A waste incineration fly ash treatment apparatus characterized by comprising: In a waste fly ash treatment method in which dioxins contained in fly ash discharged from a waste treatment furnace that incinerates or gasifies and melts waste to volatilize and remove it,
A stirring fluid heating step of receiving fly ash and heating gas to stir and flow the fly ash and heating the fly ash with a heating gas;
A fly ash heating step in which the fly ash in the stirring fluid heating step is heated by heat exchange with the heat medium using a heat medium;
A solar heat collecting process for collecting solar heat;
Solar heat receiving heat medium heating step of receiving solar heat and heating the heat medium with the solar heat, heating the fly ash in the fly ash heating step with the heat medium;
A solar heat receiving gas heating step that receives solar heat, heats the gas for heating with the solar heat, and sends the heating gas to the fly ash in the stirring flow heating step,
A waste incineration fly ash treatment method characterized by comprising:

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