JP6399937B2 - Combustible waste treatment equipment - Google Patents

Description

  The present invention relates to a technique for processing combustible waste while effectively using it in a cement baking apparatus.

  In cement factories, various combustible wastes such as waste plastics, BOF, ASR, RPF, RDF, wood chips, waste tires, and FRP are put into cement firing equipment and processed while effectively using them as cement raw materials and fuels. .

  For example, Patent Document 1 discloses that the FRP is crushed and put into a cement firing apparatus as a part of the fuel, or the crushed piece is put together with the waste tire as part of the fuel, and the inorganic fiber contained in the crushed piece And / or the technique which uses an inorganic filler for a part of cement raw material is disclosed.

  Patent Document 2 discloses that the used FRP is a crushed product of 50 mm or less, a crushed product of 3 mm or less, and a finely pulverized product of 90 μm or less, each of a preheater inlet for a cement firing process, and a fuel supply device for a calciner , A technique for supplying from a burner of a rotary kiln and effectively using it as a heat source is disclosed.

Japanese Patent Laid-Open No. 7-10618 Japanese Patent Laid-Open No. 6-8247

  However, in order to improve the flammability by introducing combustible waste into the cement baking equipment and to prevent adverse effects on the cement quality and the operation of the equipment, pretreatment to reduce the particle size will be performed accordingly. Processing costs increase. In particular, thermosetting / thermoplastic resin, fiber reinforced plastic (FRP), carbon fiber, and the like are difficult to pulverize, so that the pretreatment (pulverization) cost increases. Also, it can be used effectively in cement burning equipment such as organic sludge, municipal waste, biomass fuel, etc., which has trouble in the operation of cement burning equipment, such as optical fiber and solar cells that have heat quantity but are expensive in pretreatment could not.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and efficiently uses flammable waste that is difficult to use in a cement baking apparatus due to combustion characteristics, chemical composition, and physical properties. For the purpose.

In order to achieve the above object , the present invention is a combustible waste treatment apparatus, which is provided adjacent to a calcining furnace of a cement firing apparatus, and is a thermosetting / thermoplastic resin, fiber reinforced plastic, or carbon fiber. A combustion furnace in which one or more combustible wastes selected from optical fibers, solar cells, organic sludge, municipal waste, and biomass fuel are burned as they are without pretreatment, and combustion gases and combustibles discharged from the combustion furnace And a supply device for supplying the gas and the combustion residue directly to the calcining furnace without using a duct .

According to the present invention, and the flammable waste that can not be effectively utilized in the cement burning device in order cost is too high it takes to pre-treatment such as pulverization, can not be processed directly supplied to the cement burning device combustible waste Can be processed efficiently. In addition, since the combustion gas, combustible gas and combustion residue discharged from the combustion furnace are supplied directly to the calcining furnace without going through the duct, the combustible waste should be treated while minimizing heat loss. Can do.

  As described above, according to the present invention, a cement baking apparatus for combustible waste such as thermosetting / thermoplastic resin, fiber reinforced plastic, carbon fiber, optical fiber, solar cell, organic sludge, municipal waste, and biomass fuel. Can be used efficiently and efficiently.

It is a whole block diagram which shows the cement baking apparatus to which the reference example of the processing apparatus of the combustible waste which concerns on this invention is applied. It is the schematic which shows the reference example of the processing apparatus of the combustible waste which concerns on this invention. It is the schematic which shows one Embodiment of the processing apparatus of the combustible waste which concerns on this invention.

FIG. 1 shows a cement firing apparatus to which a reference example of a combustible waste treatment apparatus according to the present invention is applied. This cement firing apparatus 1 preheats a cement raw material M and a preheated raw material. A calcining furnace 4 for firing, a cement kiln 2 for firing the calcined raw material, a clinker cooler 3 for cooling the cement clinker fired in the cement kiln 2, a fan 8 for attracting exhaust gas from the preheater 5, and the present invention As a combustible waste treatment apparatus, a combustion furnace 9 for burning the combustible waste W is provided.

  The preheater 5 is composed of cyclones 5 a to 5 d arranged in four stages, and preheats the cement raw material M supplied from the raw material chute 7.

  The calcining furnace 4 includes a burner 4a for calcining, and calcines the cement raw material M supplied from the second-stage cyclone 5b of the preheater 5.

  The cement kiln 2 includes a main burner 2a, and fires the cement raw material M supplied from the lowermost cyclone 5a of the preheater 5 to the kiln bottom 2c.

  The clinker cooler 3 is provided for cooling the cement clinker fired by the cement kiln 2. The cooler bleed duct 3 a is provided for introducing the hot gas discharged from the clinker cooler 3 into the calcining furnace 4.

  The combustion furnace 9 is provided for burning the combustible waste W to generate the combustion gas and the combustible gas G. For example, a fluidized bed incinerator, a stoker type incinerator, an incinerator with a movable grate Can be used. Although the atmosphere A may be introduced into the combustion furnace 9, in order to improve the combustion efficiency of the combustible waste W, a high oxygen concentration gas having an oxygen concentration of 21% to 100% may be introduced. Combustion gas and combustible gas G are supplied to kiln bottom 2c of cement kiln 2 via a supply device (not shown).

  Next, operation | movement of the cement baking apparatus 1 which has the said structure is demonstrated, referring FIG.1 and FIG.2.

  The cement raw material M is supplied to the outlet duct of the third-stage cyclone 5c through the raw material chute 7, and the cement raw material M is preheated in the uppermost cyclone 5d, the third-stage cyclone 5c, and the second-stage cyclone 5b. After the cement raw material M preheated by the second-stage cyclone 5b is supplied to the calcining furnace 4 and calcined by the combustion heat of pulverized coal blown from the burner 4a, the cement kiln is passed through the lowermost cyclone 5a and the raw material chute 10. 2 to the kiln bottom 2c. The cement raw material M supplied to the kiln bottom 2c is baked by the combustion heat of pulverized coal blown from the main burner 2a in the cement kiln 2, and the generated cement clinker is supplied to the clinker cooler 3 to be cooled.

  In parallel with the above operation, the combustible waste W and the atmosphere A are introduced into the combustion furnace 9 to burn the combustible waste W. Combustion gas and combustible gas G are supplied to the calcining furnace 4 and used for calcining the cement raw material M, and the generated combustion residue R is supplied to the kiln bottom 2c of the cement kiln 2 and used as cement raw material. Combustible waste W is thermosetting / thermoplastic resin, fiber reinforced plastic, carbon fiber, optical fiber, solar cell, organic sludge, municipal waste, biomass fuel, etc. 9 can be supplied.

Next, one embodiment of the treatment apparatus of the combustible waste according to the present invention while referring to Figure 3.

  As the combustion furnace 12 of the combustible waste treatment apparatus 11, a fluidized bed incinerator, a stoker-type incinerator, or an incinerator with a movable grate can be used as in the combustion furnace 9 shown in FIG. In this embodiment, it is installed adjacent to the calcining furnace 4. The other structure is the same as that of the cement baking apparatus 1 shown in FIG.1 and FIG.2. With such a configuration, the combustion gas, the combustible gas G, and the combustion residue R discharged from the combustion furnace 12 can be directly supplied to the calcining furnace 4 without using a supply device or a duct, and heat loss, etc. The flammable waste W can be treated while minimizing the above.

  The combustible gas is a gas of carbon monoxide or a volatile organic substance generated by combustion and thermal decomposition of the combustible waste W. The calcining furnace 4, the cement kiln 2, and the rising duct 6 together with the combustion gas G are used. It is made to combust by supplying to and the calorie | heat amount can also be utilized effectively.

  As described above, in this embodiment, the combustible waste W is burned in the combustion furnaces 9 and 12 as they are, and the combustion gas and the combustible gas G discharged from the combustion furnaces 9 and 12 are supplied to the calcining furnace 4. Therefore, pretreatment of the flammable waste W is unnecessary, and even flammable waste with poor flammability can be effectively used at low cost.

  In the above embodiment, the combustion gas and the combustible gas G discharged from the combustion furnaces 9 and 12 are supplied to the calcining furnace 4, but the cement kiln 2 and the rising duct 6 (the exhaust gas from the cement kiln 2 are calcined). You may supply to the duct) guided to the furnace 4.

  Further, the oxygen concentration of the gas supplied to the combustion furnaces 9 and 12 may be adjusted using the hot gas discharged from the clinker cooler 3 (the hot gas passing through the cooler bleed duct 3a).

  In addition, the combustion residue recovered from the combustion furnace can be reused as a raw material for cement. However, it is possible to recover rare metals, etc., by adversely affecting the cement quality by collecting a part and analyzing the chemical composition. If it is determined, it is possible to incorporate a control for restricting the input to the cement baking apparatus (adjustment of input amount, discharge outside the system).

DESCRIPTION OF SYMBOLS 1 Cement baking apparatus 2 Cement kiln 2a Main burner 2b In front of kiln 2c Kiln bottom 3 Clinker cooler 3a Cooler bleed duct 4 Calciner 4a Burner 4a
5 Preheater 5a Lowermost cyclone 5b Second stage cyclone 5c Third stage cyclone 5d Uppermost cyclone 6 Rising duct 7 Raw material chute 8 Fan 9 Combustion furnace 10 Raw material chute 11 Combustible waste treatment device 12 Combustion furnace A Atmosphere G Combustion gas And combustible gas M Cement raw material R Combustion residue W Combustible waste

Claims (1)

One or more types selected from thermosetting / thermoplastic resin, fiber reinforced plastic, carbon fiber, optical fiber, solar cell, organic sludge, municipal waste, and biomass fuel. a combustion furnace for burning as combustible wastes without pretreatment, the combustion gas and the combustible gas and combustion residues discharged from the combustion furnace, supply device for supplying directly the calciner without passing through the duct And a combustible waste treatment apparatus.

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