JPH10103630A - Waste pyrolysis melting system - Google Patents

Abstract

(57) [Summary] A drying region A, a thermal decomposition region B, a combustion melting region C, and a melting treatment region D are sequentially formed up and down, and the generation generated in the thermal decomposition region B above the drying region A A gas discharge unit 1b for discharging gas and a slag collection mechanism 8 for collecting molten slag from the slag discharge unit 1c are provided.
In a waste pyrolysis / melting system including a waste pyrolysis / melting furnace 1 configured as a vertical furnace, it is possible to simultaneously stabilize easily scattered waste and hardly combustible waste without using other energy resources. Process. SOLUTION: A cylindrical combustion chamber 3 for burning a generated gas from a gas discharge portion 1b at a high temperature, a gas supply mechanism 4 for supplying a generated gas in a swirl, and swirling a scattered substance from the furnace accompanying the generated gas. The generated gas combustion mechanism 2 is provided with a slag recovery unit 6 that melts by the heat of combustion and discharges it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste pyrolysis and melting system, and more particularly, to a drying zone for charged waste, a pyrolysis zone for performing pyrolysis after drying, and a pyrolysis zone in order from top to bottom. Forming a combustion melting region for burning and melting the pyrolysis residue after the decomposition process, and above the drying region, a gas discharge portion for discharging a generated gas mainly composed of a combustible gas generated in the pyrolysis region; A waste pyrolysis / melting system including a waste pyrolysis / melting furnace configured as a vertical furnace, provided with a slag collection mechanism for collecting molten slag from a slag discharge section formed in the combustion / melting processing region. .

[0002]

2. Description of the Related Art Conventionally, in a waste pyrolysis melting furnace,
The pyrolysis gas discharged as product gas is burned in a combustion chamber provided in a product gas discharge path of the waste pyrolysis furnace in order to recover heat in a waste heat boiler or the like. Then, in order to prevent corrosion of a water pipe or the like of the waste heat boiler due to a chlorine compound gas such as hydrogen chloride contained in the produced gas, excessive air combustion is performed, and the combustion gas temperature is set to 800 to 900 ° C.
And the steam condition of the waste heat boiler is kept low at a steam temperature of 300 ° C. and a steam pressure of about 2 to 2.5 MPa. That is, the combustion gas is cooled by the excess air. A dust remover is provided after the waste heat boiler to prevent the emission of dust to the atmosphere.

[0003]

In the above-mentioned conventional waste pyrolysis melting furnace, if the scattered waste such as fine powder is mixed in the waste to be charged, the drying in the furnace is prevented. It is blown up into the space above the region and discharged from the gas discharge section together with the generated gas. Even if such scattered waste is burned in the secondary combustion chamber, its ash becomes fly ash accompanying the exhaust gas generated, and there is also a problem that it must be collected by a dust remover and sent to an ash treatment facility. doing. Also, when the sludge discharged from the sewage treatment equipment is to be treated together with the waste waste, sufficiently dried matter is liable to be scattered, and is collected together with the fly ash by the dust removing device, and the quality of the fly ash is reduced. If it is insufficiently dried (at that time, the moisture content of the dried sludge is 30% by weight or more), it is easy to collect in the furnace, and the ventilation is locally blocked, and the gas drifts in the furnace. As it reaches the melting processing area at the bottom of the furnace with insufficient drying in the furnace, it lowers the temperature of the molten slag, which may cause solidification of the slag at the bottom of the furnace and stably. There is also a problem that sludge cannot be treated. Therefore, the present invention solves the above-mentioned problems, and provides a waste pyrolysis and melting system capable of simultaneously stably processing scattered waste and hardly combustible waste without using other energy resources. The purpose is to provide.

[0004]

[Means for Solving the Problems]

[First characteristic configuration] The first characteristic configuration of the waste pyrolysis and melting system of the present invention for the above purpose is as described in claim 1, wherein the gas generated from the gas discharge part of the waste pyrolysis and melting furnace A high-temperature combustion chamber, a gas supply mechanism for swirling and supplying the generated gas so as to perform swirling combustion in the combustion chamber, and a scattered substance from the furnace accompanying the generated gas. The present invention is characterized in that a product gas combustion mechanism including a slag recovery unit that melts and discharges by heat is provided. [Functions and Effects of the First Characteristic Configuration] According to the first characteristic configuration, even if a solid substance is entrained in the produced gas, it can be stably processed. That is, since the generated gas is swirled and burned at a high temperature of, for example, 1200 ° C. or more, the combustibles in the accompanying scattered matter burn, and the combustion residues and ash are removed from the peripheral wall of the combustion chamber heated to a high temperature. It melts in contact with the inner surface, flows down along the inner surface of the peripheral wall, and is collected as molten slag. In addition, the entrainment of dust from the combustion chamber outlet to the downstream side is greatly reduced, and even if a waste heat boiler is provided in the subsequent exhaust gas passage, there is no danger of lowering the efficiency. As a result, easily scattered waste and hardly combustible waste can be simultaneously and stably treated without using other energy resources.

[Second feature configuration] A second feature configuration of the waste pyrolysis-melting furnace of the present invention for the above purpose is as follows. The point is that a supply mechanism is provided so as to melt the object to be processed supplied from outside the system. [Function and effect of second characteristic configuration] According to the second characteristic configuration, it is possible to simultaneously burn and melt non-combustible waste or fine waste from other facilities. That is,
If sludge, liquid waste, shredder dust, etc. are supplied from the treatment object supply mechanism, these wastes will come into contact with the high-temperature combustion gas, combustibles will burn, and incombustibles will contact the peripheral wall of the combustion chamber. The molten slag flows down the inner surface of the peripheral wall portion and is collected. In addition, in order to supply flammable liquid waste, it is sufficient to spray and supply from the processing object supply mechanism, and when the temperature decreases due to evaporation of the liquid,
Oxygen-enriched air may be supplied to the combustion chamber instead of air. In this way, for example, it is possible to treat a relatively concentrated heavy metal-containing waste liquid together with waste.
As a result, it is possible to not only burn and melt the easily scattered waste that is a weak point of the vertical waste pyrolysis melting furnace, but also to simultaneously process nonflammable waste. Will be possible.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the waste pyrolysis and melting system of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing an example of the present invention. As shown, a waste gas pyrolysis melting furnace 1 is provided with a generated gas combustion mechanism 2 in parallel with the waste pyrolysis melting furnace 1. The generated gas from the gas discharge section 1b is supplied to the gas supply mechanism 4 of the generated gas combustion mechanism 2. The combustion exhaust gas from the generated gas combustion mechanism 2 is:
It is configured to be discharged to the stack 9, generate steam in the waste heat boiler 12, remove harmful substances in the exhaust gas treatment device 13, and then discharge it to the atmosphere from the chimney. In the flue 9 on the upstream side of the exhaust gas treatment device 13, a dechlorinating agent supply mechanism 10 for removing chlorine compound gas contained in the combustion exhaust gas is disposed, and slaked lime is supplied into the combustion exhaust gas. , Collected as calcium chloride in the exhaust gas treatment device 13,
The chlorine compound gas is removed.

[0007] The waste pyrolysis melting furnace 1 includes a drying area A for waste loaded from a waste loading mechanism 1a provided at the top, and a heat decomposed after the drying treatment. Decomposition region B, a combustion and melting region C for burning the pyrolysis residue after the pyrolysis treatment is formed in the furnace, and above the drying region A, the combustible gas generated in the pyrolysis region B is mainly used. The furnace is configured as a vertical furnace provided with a gas discharge portion 1b for discharging generated gas, and a slag discharge portion 1c is formed in the combustion melting region C at the bottom of the furnace. A slag collection mechanism 8 is provided below the waste pyrolysis melting furnace 1 for collecting the molten slag discharged from the slag discharge section 1c and taking it out.

The generated gas combustion mechanism 2 includes a cylindrical combustion chamber 3 for burning the generated gas from the waste pyrolysis melting furnace 1 at a high temperature, and a swirling of the generated gas in the combustion chamber 3 for swirling combustion. The slag recovery unit 6 is configured to supply the gas supplied by the gas supply mechanism 4 and melt and process scattered matter from the furnace accompanying the generated gas by the heat of the swirling combustion. Further, the workpiece supply mechanism 7 is provided in the combustion chamber 3.
Is provided to melt the workpiece supplied from outside the system.

The gas supply mechanism 4 is provided on the peripheral wall portion 3a above the combustion chamber 3 so as to open in a direction deviated from the axis of the combustion chamber 3, and the supplied product gas is provided. The swirl is supplied along the inner surface of the peripheral wall 3a.
A plurality of oxygen supply mechanisms 5 for supplying an oxygen supply gas composed of oxygen-enriched air or the like for burning the generated gas are provided at a plurality of upper and lower positions on the peripheral wall portion 3a, and along the flow of the generated gas. Thus, an oxygen supply gas is supplied, and the generated gas is swirled and burned.

The treatment object supply mechanism 7 includes a granular material supply mechanism 7A for supplying particulate waste and a liquid waste supply mechanism 7B for supplying liquid waste. It is configured to supply powdered and granular waste and liquid waste. The powder supply mechanism 7A is constituted by a screw feeder, and the oxygen supply mechanism 5 arranged at the uppermost position is provided.
It is located below. The liquid waste supply mechanism 7B
Is provided with a spray mechanism to spray liquid waste into the combustion chamber 3 from the upper end of the combustion chamber 3.

With the above configuration, in the waste pyrolysis melting furnace 1, the waste charged from the waste charging mechanism 1a is lowered toward the furnace bottom while being heated by the hot gas from below. The dried (dry area A) and dried waste is
The pyrolysis is performed by the heat of the combustion gas from below (pyrolysis zone B), and the pyrolysis residue further descends and is burnt and melted by the oxygen-enriched air supplied from the tuyere 1d (combustion melting zone C). Slag discharge part 1c as molten slag
From the slag collecting mechanism 8. The pyrolysis gas from the pyrolysis region B rises as a product gas at about 300 to 400 ° C. together with the combustion gas from the combustion and melting region C and is discharged from the gas discharge portion 1b.

The product gas from the gas discharge portion 1b is guided to a gas supply mechanism 4 of the product gas combustion mechanism 2 and is supplied as a swirling flow into the combustion chamber 3, and the oxygen gas disposed on the peripheral wall portion 3a. Swirl combustion is performed at a high temperature of 1200 ° C. or more by air supplied with an amount slightly exceeding the theoretical oxygen amount from the supply mechanism 5. Here, the scattered waste accompanying the generated gas burns at the same time, and adheres to the inner surface of the peripheral wall portion 3a and melts as the airflow turns. The particulate waste is supplied into the combustion chamber 3 from the particulate supply mechanism 7A and is melted together. Due to the melting of the granular waste, the amount of the molten slag adhering to the inner surface of the peripheral wall 3a is increased, and flows down along the inner surface of the peripheral wall 3a. The molten slag that has flowed down is discharged from the slag recovery section 6 below the combustion chamber 3 to the slag recovery mechanism 8. The slag collecting mechanism 8 includes a water cooling tank, and the dropped slag is rapidly cooled to be granulated slag. The generated granulated slag is carried out to the outside by a carry-out mechanism.

Further, the generated gas combustion mechanism 2 is also provided with the liquid waste supply mechanism 7B, which is configured to be capable of spraying liquid waste into the combustion chamber 3 so as to be flammable and non-combustible. Liquid waste can be supplied regardless of the nature. The combustible components in the liquid waste supplied from the liquid waste supply mechanism 7B burn, the incombustible liquid comes into contact with the high-temperature combustion gas and evaporates instantaneously, and the incombustible solid component melts together with the molten slag. Then, the slag is collected by the slag collecting mechanism 8. still,
When supplying the combustible liquid waste, the supply amount of the oxygen supply gas from the oxygen supply mechanism 5 is appropriately increased.

Next, another embodiment of the present invention will be described. <1> A part of the generated gas may be supplied to the slag recovery unit 6 and burned. In this case, the fluidity of the molten slag in the slag recovery unit 6 is improved. Thus, recovery of the molten slag can be facilitated. <2> In the above embodiment, an example is shown in which steam is generated in the waste heat boiler 12, harmful substances are removed in the exhaust gas treatment device 13, and then discharged to the atmosphere from the chimney. However, a gas cooling device may be provided without providing a boiler, and the dust may be collected by the exhaust gas treatment device. <3> In the above embodiment, the workpiece supply mechanism 7
However, there is shown an example in which a particulate material supply mechanism 7A and a liquid waste supply mechanism 7B are configured to supply the particulate waste and the liquid waste into the combustion chamber 3, respectively. Only one of the workpiece supply mechanisms 7 may be provided, or a configuration in which the workpiece supply mechanism 7 is not provided. <4> In the above embodiment, the example in which the gas supply mechanism 4 is provided above the peripheral wall portion 3a so as to open in a direction deviated from the axis of the combustion chamber 3 has been described. The gas supply mechanism 4 may be disposed on the ceiling of the combustion chamber 3 and include a swirl mechanism. <5> In the above embodiment, a plurality of oxygen supply mechanisms 5 for supplying an oxygen supply gas composed of oxygen-enriched air or the like for burning the generated gas are provided at the upper and lower positions on the peripheral wall 3a. The example in which the oxygen supply mechanism 5 is provided is described.
May be provided at one place. <6> In the above embodiment, an example was shown in which air was supplied from the oxygen supply mechanism 5 as oxygen supply gas. However, the oxygen supply gas may be oxygen-enriched air. Or oxygen. <7> In the above embodiment, an example is shown in which no external auxiliary fuel is used, but an auxiliary fuel such as a fossil fuel may be used in a vertical melting furnace or a rotary melting furnace. . <8> Regarding the positional relationship of the vertical furnace exhaust gas, granular, and liquid waste to the swirling melting furnace, the exhaust gas inlet may be at the top, and the positional relationship in the vertical and horizontal directions is not limited. Also,
The number may be plural.

[0015]

As described above, according to the present invention,
Non-combustible waste can be treated at the same time.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste pyrolysis melting furnace 1b Gas discharge part 1c Slag discharge part 2 Generated gas combustion mechanism 3 Combustion chamber 4 Gas supply mechanism 6 Slag recovery part 7 Processing object supply mechanism 8 Slag recovery mechanism A Drying area B Thermal decomposition area C Combustion Melting area D Melting area

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23J 1/00 F23J 1/00 B F23L 7/00 F23L 7/00 B (72) Inventor Nobuhiko Tanaka 1-1-1 Hama, Amagasaki City, Hyogo Prefecture No. 1 Inside Kubota Technology Development Laboratory

Claims (2)

[Claims] 1. A drying area (A) for charged waste, a pyrolysis area (B) for performing pyrolysis after drying treatment, and a combustion for burning a pyrolysis residue after performing pyrolysis processing from top to bottom. A gas discharge portion (1b) for forming a melting region (C) and discharging a generated gas mainly composed of a combustible gas generated in the pyrolysis region (B) above the drying region (A); A waste pyrolysis melting furnace configured as a vertical furnace provided with a slag recovery mechanism (8) for recovering molten slag from a slag discharge section (1c) formed in the combustion melting area (C). A waste pyrolysis / melting system comprising: (1) a cylindrical combustion chamber (3) for burning a generated gas from the gas discharge section (1b) at a high temperature; and a swirling combustion in the combustion chamber (3). Gas supply for swirling and supplying the produced gas Organization (4) and the debris from the furnace entrained in the product gas, the swirling combustion slag recovery unit to discharge molten processed by heat (6) and generating a gas combustion mechanism comprising a (2)
Is provided with a waste pyrolysis and melting system. 2. The disposal according to claim 1, wherein an object supply mechanism is provided in the combustion chamber, and the object supplied from outside the system is swirled and melted. Material pyrolysis melting system.