JPH11248125A - Carbonizing pyrolysis melting combustion device for waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the generation of high-temperature corrosion or the like due to hydrochloride and obtain a combustion device prominent in controllability by a method wherein a rotary kiln type sand heating device is provided at the downstream side of the melting combustion device while a pyrolysis gas heating device, a waste heat boiler and a sand transfer device are provided at the downstream side of the sand heating device. SOLUTION: A rotary kiln type sand heating device 25 for heating heat medium or sand S by combustion waste gas G0 from a melting combustion device 4 is arranged at the downstream side of the melting combustion device 4. A pyrolysis gas heating device 27 for heating the heating gas K of waste C by the high-temperature sand from the sand heating device 25 is provided at the downstream side of the sand heating device 25 while a waste heat boiler 7 for recovering the heat of combustion waste gas G0 discharged out of the sand heating device 25 is provided. Further, a sand transfer device 28 is provided at the downstream side of the sand heating device 25 to return the sand S, discharged out of the pyrolysis gas heating device 27, to the inlet port side of the sand heating device 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for pyrolysis melting and burning of waste such as municipal solid waste. The present invention relates to a dry distillation pyrolysis melting and burning apparatus for waste which is capable of thermally decomposing waste economically without causing high-temperature corrosion on the carbonization pyrolysis drum using the heat of the above.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a conventional dry distillation pyrolysis melting and burning apparatus for waste. A waste C supplied into a dry distillation pyrolysis drum 2 by a supply device 1 is used here. Is heated to a temperature of 300 ° C. to 600 ° C. for a certain period of time under the shut-off of air to be converted into a pyrolysis gas G and a pyrolysis residue D.
And separated.

[0003] The separated pyrolysis gas G is continuously sent to a melting and burning apparatus 4 where it is burned at a high temperature. Also, pyrolysis residue D
Is sent to a sorting device 5 where it is separated into relatively coarse non-combustible solids and fine combustible solids. Further, the separated combustible solids I are finely pulverized by the pulverizing device 6 and then supplied to the melting and burning device 4 to be melted and burned at a temperature of 1200 ° C. or more. The molten slag F formed in the molten combustion device 4 is sequentially taken out as granulated slag, and the combustion exhaust gas G _O from the molten combustion device 4 is discharged from the waste heat boiler 7, dust collector 8, gas purification device 9. , Through the chimney 10 to the atmosphere.

[0004] The dry distillation pyrolysis drum 2 is formed of a rotary drum provided with a heating tube 11, and a plurality of heating tubes 11 arranged in the longitudinal direction of the drum are used to heat waste. The heating gas K is circulated and circulated. By the way, as the heating gas K for heating the waste C in the dry distillation pyrolysis drum 2, high-temperature combustion exhaust gas G _O from the melting and burning device 4 is used.
And supplying it to the dry distillation pyrolysis drum 2 is the most preferable measure in terms of thermal economy. However, the melting combustion device 4
The high-temperature combustion exhaust gas G _O contains a large amount of hydrogen chloride (HCl) gas generated by the combustion of an organic chlorine compound such as vinyl chloride contained in the waste C.
Due to its severe corrosiveness at high temperatures, its use as a heating gas K for the carbonization pyrolysis drum 2 is generally avoided.

Therefore, in the conventional dry distillation pyrolysis melting and burning apparatus, an oil or gas fired hot air generating furnace 12 is connected between the gas inlet side and the gas outlet side of the dry distillation pyrolysis drum 2. The heating gas K from the hot-air generating furnace 12 is supplied into the heating pipe 11 of the dry distillation pyrolysis drum 2 to heat the waste C (FIG. 3), or a high-temperature air heater is provided at the outlet side of the melting and burning apparatus 4. 13 during normal operation.
The high-temperature air (heated gas K) heated in step (1) is supplied into the dry distillation pyrolysis drum 2 to heat the waste C (FIG. 4).

In FIGS. 3 and 4, reference numeral 14 denotes a steam turbine generator, 15 denotes a blower, 16 denotes an induced draft fan, 1
7 is a cooling conveyor, 18 is a combustible fine powder storage tank, 19 is a heating gas flow path, 20 is a circulation fan, 21 is a heat exchanger, 22
Is an oil burner or gas burner, 23 is a waste pit,
Reference numeral 24 denotes a waste supply crane.

[0007]

The combustion gas (heating gas K) generated in the hot air generator 12 using the fossil fuel.
Is usually a so-called clean gas and contains almost no corrosive substances. Therefore, trouble due to high-temperature corrosion is almost completely prevented. Similarly, since the high-temperature air (heating gas K) from the air heater 13 does not contain a corrosive substance, trouble due to high-temperature corrosion of the heating tube 11 and the like of the dry distillation pyrolysis drum 2 is almost completely prevented. .

However, in the dry distillation pyrolysis melting and burning apparatus using the hot air generator 12, an external fuel such as oil or gas is required during the operation of the apparatus, and the running cost is inevitably increased, and the disposal cost of the waste C is increased. There is a problem that it is difficult to significantly reduce the size of the product.

In the dry distillation pyrolysis melting combustion apparatus using the air heater 13, the air heater 13 comes into direct contact with the combustion exhaust gas G _O containing hydrogen chloride.
The hot corrosion itself occurs and must be replaced in a short time. As a result, problems such as a large increase in maintenance costs and a decrease in the efficiency of heat recovery due to dust adhering to the combustion exhaust gas G _O occur. In addition, when the properties and amount of the waste C change, In addition, there are problems such as difficulty in controlling the temperature of the air (heating gas K).

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional dry distillation pyrolysis melting and burning apparatus for waste,
In other words, when fuel such as oil is used for heating the waste, it is difficult to save energy, and it is not possible to significantly reduce the waste disposal cost. In order to solve the problems such as the inevitable occurrence of high-temperature corrosion due to hydrogen chloride, it becomes difficult to control the temperature of the heated gas when the nature or amount of waste changes, A device that can significantly reduce running costs and maintenance costs, does not cause problems such as high-temperature corrosion caused by hydrogen chloride, and provides a dry distillation pyrolysis melting and combustion device with excellent controllability. It is.

[0011]

According to the first aspect of the present invention, there is provided a dry distillation pyrolysis drum which pyrolyzes waste into a pyrolysis gas and a pyrolysis residue, and a combustible material in the pyrolysis gas and the pyrolysis residue. And a rotary kiln-type sand heating device that is provided downstream of the melting and burning device and heats the sand that is the heat medium with the combustion exhaust gas from the melting and burning device, and downstream of the sand heating device. A gas heating device for pyrolysis that heats the waste heating gas with high-temperature sand from the sand heating device, and a heat recovery device that is provided downstream of the sand heating device and recovers the heat of the combustion exhaust gas discharged from the sand heating device The present invention comprises a waste heat boiler and a sand conveying device for returning sand discharged from the pyrolysis gas heating device to an inlet side of the sand heating device.

According to a second aspect of the present invention, in the first aspect of the present invention, the pyrolysis gas heating device is disposed in a cylindrical body having a sand discharge port below and a cylindrical body. The heating pipe is formed from a heating pipe and a purging nozzle for ejecting a part of the heating gas below the heating pipe into the sand.

[0013] The invention of claim 3 is claim 1 or claim 2.
In the invention, the gas heating device for thermal decomposition is supported so as to be capable of being vibrated and is slightly vibrated by the vibrating device.

According to a fourth aspect of the present invention, in the first aspect of the present invention, there is provided a sand transport device, comprising: a sand discharging screw device for extracting sand from a pyrolysis gas heating device; and a bucket conveyor device for transporting the extracted sand. And a screen device for removing foreign matter from the sand.

According to a fifth aspect of the present invention, in the second aspect of the present invention, the heating pipe of the pyrolysis gas heating device is connected to the gas inlet side and the gas outlet side by a bypass passage provided with a damper device. It is configured.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall system diagram of a waste carbonization pyrolysis melting and burning apparatus according to an embodiment of the present invention. In FIG. 1, the same parts and members as those in FIG. 3 and FIG. The same reference numbers are used. In FIG. 1, 1 is a supply device for waste C, 2 is a carbonization pyrolysis drum, 3 is a discharge device, 4 is a melting and burning device, 5 is a sorting device,
6 is a crusher, 7 is a waste heat boiler, 8 is a dust collector, 9 is a gas purifier, 10 is a chimney, 15 is a blower, 16 is an induction ventilator, 17 is a cooling conveyor, 18 is a combustible fine powder storage tank, 1
9 is a heating gas flow path, 20 is a circulation fan, 23 is a waste pit, and 24 is a waste supply crane.
The configuration is exactly the same as that of FIG.

1 and 2, reference numeral 25 denotes a sand heating device, S denotes sand as a heating medium, 26 denotes a supply sand supply device, 2
7 is a gas heating device for thermal decomposition of waste C, 27a is a trunk body, 27b is a heating tube, 27c is a purge nozzle, 28 is a sand transport device, 28a is a sanding screw device, 28b is a bucket conveyor device, 28c is Screen device, 29
Is a slag water cooling tank, 30 is a bypass passage, 31 is a damper device, 32 is a vibration generator, 33 is a temperature control device, 34 is a header, 35 is a dust ash silo, 36 is a blower, 37 is a rotary kiln drive device, 38 Numeral denotes a combustion exhaust gas passage, and members from FIG. 25 to FIG. 38 are members constituting a main part of the present invention.

The dry distillation pyrolysis drum 2 is rotatably supported with the inlet side upward and the outlet side downward at an inclination angle of about 1.5 degrees with respect to the horizontal. The inside is driven to rotate at a rotation speed of about 1 to 3 rpm. or,
Inside the dry distillation pyrolysis drum 2, a plurality of heating tubes (not shown) are arranged in parallel with the axis of the drum. Each of the heating tubes is supported and fixed in a state where both ends thereof are respectively connected to an inlet casing and an outlet casing, and rotates together with the dry distillation pyrolysis drum 2.

The high-temperature melting combustion device 4 includes a vertical cylindrical main body 4a, an inclined bottom surface 4b, a discharge passage 4c for the combustion exhaust gas G _O , and the like. The carbon residue I _O in the decomposition residue D, the dust ash E from the dust ash silo 35, and the like are injected, where they are melted and burned at a high temperature. Further, the molten slag F formed by the molten combustion flows down along the bottom surface 4b and falls into the slag water cooling tank 29 from the slag discharge port 4d.

The sand heating device 25 is a so-called rotary kiln type heating device as shown in FIG. 2, and the rotary kiln 25a is rotated on the support base 25b in an inclined position with the inlet side being upward and the outlet side being downward. The rotary kiln driving device 37 is rotatably driven at a predetermined speed in a direction indicated by an arrow. The inlet side of the rotary kiln 25a is connected to the gas discharge passage 4c of the melting and burning device 4.
Further, the outlet side is opened above a body 27a forming a gas heating device 27 for thermal decomposition, which will be described later.

The pyrolysis gas heating device 27 includes a cylindrical body 27a having an inverted conical bottom, and a body 27a.
a, a heating pipe 27b, and a purging nozzle 27c provided below the heating pipe 27b.
From the outlet side of the rotary kiln 25a, hot sand S
Are sequentially discharged above the trunk body 27a. Also,
The upper part of the trunk body 27a is connected to a flue gas flow passage 38 for leading high-temperature flue gas G _O to the waste heat boiler 7, and the flue gas G _O discharged from the rotary kiln 25a is burned. The waste gas is introduced into the waste heat boiler 7 through the exhaust gas passage 38. Further, a sand discharge port 27d is provided at the lowermost end of the body 27a, and sand S is discharged at a predetermined flow rate through a sand discharge screw device 28a described later.

In this embodiment, the pyrolysis gas heating device 27 is suspended and supported in a so-called vibrating manner via expansion joints 27e and 27f, a support spring 27g, a flexible pipe 27h, and the like. By operating the vibration generator (vibration motor) 32, the body 27a
Is given a slight vibration at a predetermined frequency to thereby increase the heat transfer coefficient between the sand S and the heating pipe 27b.

The heating tube 27b is connected to the body 27a.
A plurality of them are arranged side by side. The gas inlet side and the gas outlet side of each heating pipe 27b are respectively connected to the header 34, and the heating gas (air) K is circulated at a predetermined flow rate by the circulation fan 20 through the heating gas flow path 19. . The gas inlet side and the gas outlet side of the heating pipe 27b are communicated with each other by a bypass flow path 30 provided with a damper device 31, and the opening of the damper device 31 is adjusted by a signal from a temperature control device 33. By doing so, the temperature of the high-temperature heating gas K flowing back to the dry distillation pyrolysis drum 2 is adjusted.

The sand conveying device 28 is provided with a sand screw device 2 for removing sand S from the pyrolysis gas heating device 27.
8a, a bucket conveyor 28b for transporting the sand S taken out, a screen 28c for removing solids and the like in the sand S discharged from the bucket conveyor 28b, and the like. The sand S for the heat medium has a particle diameter of 1 to 1.
3 mm of silicon carbide is used.

Next, the operation of the waste carbonization pyrolysis melting and burning apparatus of the present invention will be described. The waste C stored in the waste pit 23 is sequentially supplied to the dry distillation pyrolysis drum 2 by the supply device 1, and the room temperature is controlled by the heating gas K flowing through the heating pipe in a state where oxygen is substantially shut off. From 3
It is heated to a temperature of from 00C to 600C, preferably from 400C to 500C. By stirring and mixing for about one hour in this state, the waste C in the dry distillation pyrolysis drum 2 is pyrolyzed, and a pyrolysis gas G and a solid pyrolysis residue D are generated.

The pyrolysis of the waste C is usually completed in about one hour, and the pyrolysis gas G of about 75 wt% and the
Is generated. In addition, the generated pyrolysis residue D is homogenized by being stirred and mixed in the dry distillation pyrolysis drum 2 to become particles of a uniform size. The generated pyrolysis gas G contains water, CO, CO ₂ , H
₂ and hydrocarbons as main components, and also contains a small amount of dust and tar.
It is 0 to 2000 kcal / kg. Furthermore, the pyrolysis residue D is mainly composed of carbon and ash, but the carbon content varies depending on the particle size of the pyrolysis residue D, and the smaller the particle size, the higher the carbon content. For example, when the particle size of the pyrolysis residue D is 5 mm or less, the carbon content is approximately 35% by weight.

The pyrolysis gas G and the pyrolysis residue D in the dry distillation pyrolysis drum 2 are discharged into the adjacent carry-out device 3, where they are separated into the pyrolysis gas G and the pyrolysis residue D. The separated pyrolysis gas G is supplied to the melting and burning device 4 and is so-called melted and burned together with the carbon residue I _O and the dust ash E described later. Further, the pyrolysis residue D is cooled from a temperature of about 400 ° C. to 500 ° C. to a temperature of about 80 ° C. on the cooling conveyor 17, and is a valuable material such as iron, aluminum or incombustible material in the sorting device 5. Sand, glass, etc. are sorted out,
The combustible solid I mainly composed of combustibles is separated. Further, the separated combustible solids I are pulverized by the pulverizer 6 and then stored in the combustible fine powder storage tank 18, and the dust ash E from the waste heat boiler 7, the dust collector 8, and the like as described above. Together with the pyrolysis gas G by pneumatic transport to the melting and burning device 4. That is, the carbon residue I _O having a high carbon content supplied into the melting and burning apparatus 4 together with the pyrolysis gas G in the melting and burning apparatus 4 is lower than the melting temperature of the ash by one.
It is burned at a high temperature of about 1300 ° C., which is about 00 to 150 ° C., flows down along the inclined bottom surface 4b as molten slag F, and is discharged into the slag water cooling tank 29 from the slag discharge port 4d, so-called. It becomes granulated slag.

Approximately 1100-1000 generated in the melting and burning apparatus 4
The high-temperature combustion exhaust gas G _O of 1200 ° C.
Through the rotary kiln 25a of the sand heating device 25. In addition, the introduced high-temperature combustion exhaust gas G _O is
While passing through the inside of the rotary kiln 25a, the retained heat is given to the sand S and the rotary kiln 25a, and is introduced into the waste heat boiler 7 through the combustion exhaust gas passage 38.

The rotary kiln 2 of the sand heating device 25
The sand S for the heat medium is supplied at a predetermined flow rate from the sand supply port 25c provided on the upstream side surface into the inside of the high-temperature flue gas 5a by the rotation of the rotary kiln 25a. contact with G _O or kiln walls are heated. Specifically, the rotation speed of the rotary kiln 25a is set to about 2 to 5 rpm, and the high-temperature combustion exhaust gas G _O has an inlet temperature of 1000 to 1100 ° C. and an outlet temperature of 70 ° C.
The temperature of the sand S is set at 300 to 400 ° C and the outlet temperature is set at 600 to 700 ° C.

600 to 700 ° C. in the sand heating device 25
Sand S that has been heated in is discharged from the downstream side of the sand outlet 25d of the rotary kiln 25a upward of the combustion exhaust gas G _O with pyrolysis gas heating device 27 descends by gravity to the upper portion of cylinder body 27a. In addition, the discharged flue gas G _O
Is sent to the waste heat boiler 7 through the flue gas passage 38 as described above, and the exhaust gas G _O cooled to about 200 ° C. by heat recovery in the waste heat boiler is subjected to dust removal by the dust collecting device 8. After that, the gas is cleaned by the gas purifier 9 and
Chimney 1 after removing harmful substances such as l, SOx and NOx
It is discharged into the atmosphere from zero.

The body 2 of the pyrolysis gas heating device 27
In the inside 7a, sand S as a heat medium is stored in a layered manner, and the amount of sand S flowing from the sand heating device 25 and the sand S screw device 28a are discharged from the body 27a by the sand discharging screw device 28a. And the amount of sand S is almost balanced. That is, the sand S as the heat medium is supplied to the sand heating device 25.
The gas is circulated in a circulation path formed by the pyrolysis gas heating device 27 and the sand transport device 28, and a shortage of sand S is supplied into the system from a supply sand supply device 26 described later.

In the pyrolysis gas heating device 27, while the hot sand S flows down in the body 27a, the retained heat is given to the heating gas (air) K via the heating pipe 27b.
The heating gas K is heated. Specifically, in the pyrolysis gas heating device 27 of the present embodiment, the inlet temperature of sand 700 to 8
The temperature is set to 00 ° C, the outlet temperature is set to 400 to 500 ° C, the inlet temperature of the heated gas is set to 250 to 350 ° C, and the outlet temperature is set to 500 to 600 ° C.

The purifying nozzle 27c provided at the bottom of the pyrolysis gas heating device 27 is supplied from the dry distillation pyrolysis drum 2
A part of the heated gas (air) K circulated from the nozzle is jetted into the sand S. By jetting the heating gas K into the sand S, the combustion exhaust gas G _O containing HCl and the like adhering to the sand S and brought into the pyrolysis gas heating device 27 is radiated upward, and Are kept in a cleaner state.
Further, in order to enhance the heat exchange property between the sand S and the heating pipe 27b, the body 27a is held so as to be able to vibrate finely. May be slightly vibrated. Further, in order to adjust the outlet temperature of the heating gas K, the heating pipe 27
b, the inlet side and the outlet side are connected by a bypass passage 30 provided with a damper device 31, and a temperature control device 33
By controlling the opening and closing of the damper device 31 to adjust the flow rate of the low-temperature heating gas K mixed into the high-temperature heating gas K, the temperature of the heating gas K returned to the dry distillation pyrolysis drum 2 is reduced by 5
It is kept at 00 to 600 ° C.

In the pyrolysis gas heating device 27, the heating gas (air) K heated to about 500 ° C. to 600 ° C. by the high-temperature sand S passes through the heating gas flow path 19 as described above, and becomes a dry distillation pyrolysis drum. 2 and the waste C is returned to the state where the temperature is lowered to 250 to 350 ° C. by heating the waste C.

The sand S discharged from the pyrolysis gas heating device 27 by the sanding screw device 28a is screened by a bucket conveyor device 28b.
After being transported upward, solid foreign matter such as clinker generated in the sand heating device 25 and dust contained in the combustion exhaust gas G _O are removed, the dust is returned to the sand heating device 25. Further, an appropriate amount of sand is supplied into the system from the supply sand silo 26a by the supply sand supply device 26.

[0036]

According to the present invention, sand is used as a heat medium, the sand is heated by high-temperature exhaust gas from a melting and burning device, and the heated gas of waste is heated to a predetermined temperature by the sensible heat of the sand. Configuration. As a result, an apparatus for generating a heating gas using fossil fuel as in a conventional dry distillation pyrolysis melting and burning apparatus of this kind of waste is not required, and the waste disposal cost can be significantly reduced. In addition, the high-temperature sand obtained by heat exchange with the combustion exhaust gas from the melting combustion device contains almost no corrosive gas components such as hydrogen chloride gas contained in the combustion exhaust gas, and is a clean heat source. Things. As a result, the heating pipe provided in the pyrolysis gas heating device is placed under a condition that hardly causes high-temperature corrosion, and stable operation can be performed for a long time. Furthermore,
When the pyrolysis gas heating device is finely vibrated, the heat exchange property between the sand and the heating gas is improved, which is advantageous for heat recovery. In addition, by controlling the opening and closing of the damper device of the bypass flow passage arranged in parallel with the heating pipe, the temperature of the heating gas can be controlled very easily, which is convenient. In addition, by blowing a predetermined amount of heating gas (air) from the purging nozzle into the sand layer,
The combustion exhaust gas that has entered the pyrolysis gas heating device accompanying the sand from the sand heating device will be easily discharged,
Hot corrosion of the heating tube is more completely prevented.
The present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is an overall system diagram of an apparatus for dry distillation pyrolysis melting and burning of waste according to an embodiment of the present invention.

FIG. 2 is a partially enlarged longitudinal sectional view showing a main part of a waste distillation pyrolysis melting and burning apparatus according to the present invention.

FIG. 3 is an overall system diagram showing one example of a conventional waste distillation pyrolysis melting and burning apparatus.

FIG. 4 is an overall system diagram showing another example of the conventional dry distillation pyrolysis melting and burning apparatus for waste.

[Explanation of symbols]

C: Waste, D: Pyrolysis residue, G: Pyrolysis gas, I: Flammable solid, I _O : Carbon residue, F: Molten slag, G
_O : Combustion exhaust gas, K: Heated gas, E: Dust ash, S: Sand,
DESCRIPTION OF SYMBOLS 1 ... Supply apparatus, 2 ... Dry distillation pyrolysis drum, 3 ... Unloading apparatus,
DESCRIPTION OF SYMBOLS 4 ... Melt combustion apparatus, 4a ... Main body, 4b ... Bottom, 4c ... Discharge channel, 4d ... Slag discharge port, 5 ... Sorting apparatus, 6 ... Crushing apparatus, 7 ... Waste heat boiler, 8 ... Dust collector, 9 ... Gas purifier, 10: chimney, 15: blower, 16: induction drafter, 1
7: cooling conveyor, 18: combustible fine powder storage tank, 19: heating gas flow path, 20: circulation fan, 21: heat exchanger, 22
... oil burner (or gas burner), 23 ... waste pit, 24 ... waste supply crane, 25 ... sand heating device,
25a ... Rotary kiln, 25b ... Support stand, 25c
... Sand supply port, 25d ... Sand outlet, 26 ... Supply sand supply device,
26a: supply sand silo, 27: gas heating device for thermal decomposition,
27a ... trunk body, 27b ... heating tube, 27c ... purge nozzle, 27d ... sand discharge port, 27e ... expansion joint, 27f ...
Expansion joint, 27g ... Support spring, 27h ... Flexible pipe, 28 ... Sand transport device, 28a ... Sanding screw device, 28b ... Bucket conveyor device, 28c ... Screen device, 29 ... Slag water cooling tank, 30 ... Bypass flow path,
DESCRIPTION OF SYMBOLS 31 ... Damper device, 32 ... Vibration generator, 33 ... Temperature control device, 34 ... Header, 35 ... Dust ash silo, 36 ... Blower, 37 ... Rotary kiln drive device, 38 ... Combustion exhaust gas passage.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FIF23G 5/027 ZAB B09B 3/00 ZAB 5/14 ZAB 302F

Claims (5)

[Claims] 1. A dry distillation pyrolysis drum that pyrolyzes waste into pyrolysis gas and pyrolysis residue, a melt combustion device that melts and burns the pyrolysis gas and combustibles in the pyrolysis residue, and melt combustion A rotary kiln type sand heating device that is provided downstream of the device and heats the sand as a heat medium by the combustion exhaust gas from the melting and burning device, and a high-temperature sand from the sand heating device that is provided downstream of the sand heating device. A pyrolysis gas heating device for heating the waste gas by heating, a waste heat boiler provided downstream of the sand heating device and recovering heat of the combustion exhaust gas discharged from the sand heating device, and the pyrolysis gas A dry distillation pyrolysis melting and burning apparatus for waste, comprising: a sand conveying device for returning sand discharged from a heating device to an inlet side of the sand heating device. 2. A pyrolysis gas heating apparatus comprising: a tubular body having a sand discharge port provided below; a heating pipe provided in the body; and a heating gas provided below the heating pipe. 2. The apparatus for dry distillation pyrolysis melting and combustion of waste according to claim 1, wherein a part of the apparatus is formed by a purging nozzle for ejecting a part into sand. 3. The apparatus for dry distillation pyrolysis melting and combustion of waste according to claim 1, wherein the pyrolysis gas heating device is supported so as to be capable of being vibrated and is finely vibrated by the vibrating device. 4. A sand conveying device comprising: a sanding screw device for extracting sand from a pyrolysis gas heating device; a bucket conveyor device for conveying the extracted sand; and a screen device for removing foreign matter from the sand. Claim 1.
2. The carbonization pyrolysis melting and burning apparatus according to item 1. 5. The waste pipe according to claim 2, wherein the heating pipe of the gas heating apparatus for pyrolysis has a configuration in which a gas inlet side and a gas outlet side are communicated with each other by a bypass passage provided with a damper device. Dry distillation pyrolysis melting and burning equipment.