JPS6329913B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a waste tire carbonization apparatus that efficiently performs initial pyrolysis treatment of waste tires to obtain carbonization oil at a high recovery rate. [Conventional technology] In recent years, with the increase in the amount of scrap tire waste,
As part of this treatment, efforts are being made to pack waste tires into a carbonization device and steam and burn them to recover the carbonization volatile content, thereby disposing of the waste and making effective use of resources. However, in the carbonization equipment for waste tires, the temperature is 250℃.
If the heat treatment is not applied almost uniformly at around 350°C, the locally heated parts will cause deterioration of the properties of the waste tire, which will not only reduce the recovery rate of the carbonized oil but also leave the uncarbonized part as a residue in the pot. When such residue is incinerated, it emits a foul odor and black smoke rises, so it cannot be used as fuel, and even if it is disposed of, it causes new pollution, making it difficult to dispose of. Therefore, in order to eliminate these drawbacks, the pot was designed to have a double-walled structure, and by indirectly heating the inside, the temperature inside the pot was maintained almost uniformly. It is disclosed in Sho 59-102984. On the other hand, even with the above technology, there is still a temperature difference between the periphery and the center of the pot, and uniform heating of the waste tires cannot be achieved.Therefore, as another method, the center of the bottom of the pot is recessed into a cylindrical shape, and the combustion chamber is A vertical cylinder directly connected to the cylinder faces the inside of the recess, and heated gas from the combustion chamber flows into the recess from the vertical cylinder, and the heated gas is further guided to the outer periphery of the pot and discharged to the outside. JP-A-58-13693 discloses a device in which the temperature difference between the central portion and the peripheral portion is reduced. [Problems to be Solved by the Invention] However, simply guiding the heated gas from the recessed portion to the outer periphery of the pot causes the temperature of the heated gas to drop to the outer periphery of the pot, so that uniform heating treatment cannot yet be achieved. It was hot. [Means for Solving the Problems] Therefore, the present invention provides a partition wall 11 at the inner bottom of the furnace body 1 that divides the inside of the furnace body 1 into two upper and lower chambers.
The lower side of the partition wall 11 is a combustion chamber 13 and the upper side is an inner pot chamber, and a vertical cylinder 19 that communicates between the combustion chamber 13 and the inner pot chamber is protruded from the center of the partition wall 11.
9, an appropriate number of openings 18 are bored at the outer positions, and the inner pot chamber has a double wall structure with a heat buffer space 8 formed by the inner wall 6 and the outer wall 7, and a recess is formed in the center of the bottom. The inner pot 3 is arranged so that the inner pot 3 forms a cavity 9 surrounding the vertical cylinder 19, and the space between the outer bottom surface of the inner pot 3 and the partition wall 11, and between the inner pot 3 and the furnace body. This invention provides a waste tire carbonization apparatus in which a passage section 2 for the heated gas generated in the combustion chamber 13 is formed between the combustion chamber 13 and the inner peripheral surface of the combustion chamber 13. [Function] The inner pot 3 has a double-walled structure and a concave structure at the center of the bottom, which reduces sudden heating and local heating of the inner pot 3 while also making it possible to prevent the inner pot 3 from being heated from the inside to the outside. Can be heated from both sides. In addition, the heated gas in the combustion chamber 13 is supplied from the vertical cylinder 19 to the cavity 9, and the openings 1 provided in the partition wall 11
Heating gas also flows into the inner pot chamber from 8, thereby achieving uniform heating of the inner pot 3. [Example] The present invention will be described below based on the drawings. Reference numeral 1 denotes a cylindrical furnace body whose inner circumferential surface is covered with a heat insulating material, and a similarly cylindrical inner pot 3 is installed inside the furnace body with a heating gas passage section 2 between the inner circumferential surface and the inner circumferential surface. . Reference numeral 4 denotes a chimney for discharging heated gas, which is provided outside the upper part of the furnace body 1 in communication with the passage section 2. As shown in FIG. 2, the inner pot has an inner wall 6 forming a storage chamber 5 for storing waste tires, and an outer wall 7 surrounding the inner wall 6 with a predetermined gap between the inner wall 6 and the outer wall 7. It has a double structure with a thermal buffer space 8 between the two. In addition, in order to increase thermal efficiency, the center portion of the bottom of the passage portion 2 is recessed.
A cylindrical cavity 9 is formed which communicates with the. 1
0 is a heating can disposed at the bottom of the furnace body 1. The heating can 10 has a combustion chamber 13 formed by an upper partition wall 11 and a tray 12 provided at the lower part, and an oil line 14 is connected to one side of the combustion chamber 13. An oil burner 15 is installed, and nozzles 17, 17 for blowing air through an outside air fan 16 are installed below the combustion chamber 13 and the tray 12. In addition, the partition wall 1
1 is provided with an opening 18 that communicates with the passage section 2, and a vertical cylinder 19 whose upper end is opened in the center of the partition wall.
is provided protrudingly to face the bottom cavity 9 of the inner pot 3. A top lid 20 that seals the storage chamber 5 of the inner pot 3 has a distillation nozzle 2 through which volatile matter from waste tires passes.
1 is provided, and a nozzle 24 communicating with a cavity 23 defined by an upper lid 20 and an opening/closing lid 22 at the top of the furnace body 1 takes the carbonized outflow gas out of the system.
A pressure gauge 25 and a safety valve 26 are provided, respectively. 27 is an air fin cooler for cooling and liquefying the distillate gas, and is connected to the nozzle 24 via an overhead line 28, and 29 is a drain valve 30 for cutting off sludge water contained in the carbonized oil obtained by liquefying the distillate gas. It is equipped with an oil separator. 31 is a condenser that stabilizes the properties of the carbonized oil that has been cooled and liquefied, and is connected to the oil separator 29 via an overflow pipe 32;
1 uses a refrigerator 33 to cool the system with a direct expansion coil 34, the inside of the shell is partitioned with a buttful 35, and carbonized oil recovery nozzles 36, 37 are installed at the ends.
has been established. Reference numeral 38 designates a return gas pipe through which uncondensed carbonized gas from which distilled gas is separated from carbonized oil by the air fin cooler 27 is delivered to the carbonized gas burner 39 . Note that 40 is a neutralizing agent storage tank for performing neutralization treatment, and 41 is a cetane number improver tank that is injected into the line as necessary. Therefore, in the present invention having such a configuration, a waste tire is first stored in the inner pot 3 in the furnace body 1, and while oil is supplied through the oil line 14, the oil burner 15 is ignited and burned, and the generated heated gas is burned. It passes through the opening 18 and the vertical tube 19 from the chamber 13, is introduced into the passage 2 surrounding the outer wall 7 of the inner pot 3, and is discharged into the chimney 4 while heating the inner pot 3. At this time, the temperature inside the furnace rises to several hundred degrees, but the inside of the inner pot 3 is kept at a temperature within the carbonization operation range of 250 degrees Celsius to 350 degrees Celsius due to the thermal buffer space 8.
It can be maintained at ℃. Furthermore, the stationary gas in the thermal buffer space 8, together with the inner wall 6 and outer wall 7, increases the heat content of the inner pot 3 during combustion, absorbing and retaining heat in the case of excessive combustion, and retaining heat in the case of insufficient combustion. By discharging, combustion fluctuations in the heating can can be moderated, and the inside of the inner pot 3 can be uniformly heated within a constant temperature range.As a result, the waste tires are carbonized completely and evenly, and a large amount of distilled gas is generated from the storage chamber 5. Furthermore, after the carbonization operation, by correcting non-uniform heating by the thermal buffer space 8, a carbon residue sufficiently useful as solid fuel is produced in the inner pot 3 as a by-product. Note that if the heated gas is simply allowed to flow into the cavity 9 from the vertical tube 19, the temperature of the heated gas will drop when it flows through the passage section 2, but the heated gas can also flow through the openings 18 provided in the partition wall 11. This problem is solved by allowing the water to flow in, and uniform heating from both the inside and outside of the inner pot 3 becomes possible. Therefore, the distillate gas generated in the storage chamber 5 enters the empty chamber 23 from the distillation nozzle 21, and the nozzle 2
4. The distillate gas passes through the overhead line 28 to the air fin cooler 27, where the distilled gas is cooled and a carbonized oil is produced. The carbonized oil produced in this way is removed from the sludge water in a separator 29, and
The recovery nozzle 3 is treated with residual sludge by a condenser 31, dewaxed with paraffin wax treatment, etc., while being neutralized as necessary to improve properties.
Refined oil according to the purpose is extracted from 6 and 37. Furthermore, during the next carbonization, the carbon residue obtained by this carbonization operation is put into the combustion chamber 13, and the inner pot 3 containing the waste tire is heated by combustion by igniting the oil burner 15. After igniting, the oil burner 15 is turned off and combustion is continued using carbon residue that is automatically supplied onto the tray 12 by a stoker (not shown). Next, it is detected that the temperature inside the furnace has reached the set temperature range, and the outside air fan 16 is turned on.
At the same time as the air supply is stopped, the carbonization gas generated after the air fin cooler 27 by the above preparatory operation is replenished through the return gas pipe, and the carbonization gas burner 39 is ignited to carry out the carbonization process.
Thus, the carbonized oil obtained through the oil separator 29 is comparable to heavy oil A obtained by petroleum refining, and the results of its property analysis are shown in Table 1.

[Table] Additionally, the carbon residue obtained by the present invention is valuable because it can be used satisfactorily as a solid fuel, unlike conventional carbon residues, due to uniform heating. Further, according to the present invention, the amount of carbonized oil recovered is larger than that of conventional carbonization equipment, and the amount of oil extracted and the amount of carbon residue are shown in Table 2.

[Table] [Effects of the invention] As described above, the present invention can reduce waste tires to 20% by weight.
Conventional carbonization equipment, which could only extract ~30% of the carbonized oil and could not utilize the carbon residue left inside the pot, has now been carbonized by adopting a double-walled structure that allows the inner pot to be heated evenly in the optimal carbonization temperature range. oil recovery rate
In addition, by making the by-product carbon residue harmless and using it as a heat source for the next carbonization operation along with the unrecoverable low-boiling carbonization gas,
This method recovers only effective oil from waste tires without producing any waste that is not used and causes secondary pollution, and it aims to effectively use resources while also processing waste tires and making it economically viable. It has great effects.

[Brief explanation of the drawing]

The drawings relate to the present invention; FIG. 1 is a carbonization treatment process diagram of the present invention, and FIG. 2 is a schematic sectional view of a carbonization apparatus. 1...furnace body, 2...passage section, 3...inner pot, 6...
...Inner wall, 7...Outer wall, 8...Heat buffer space, 9
...Cavity, 11...Partition wall, 13...Combustion chamber, 15
...Oil burner, 18...Open hole, 19...Vertical cylinder.

Claims (1)

[Claims] 1 A partition wall is provided at the inner bottom of the furnace body to divide the furnace body into two upper and lower chambers, the lower side of the partition wall is the combustion chamber, the upper side is the inner pot chamber, and the combustion chamber and the inner pot chamber are located at the center of the partition wall. At the same time, a suitable number of openings are provided on the outer side of the vertical cylinder of the partition wall, and a double wall is provided inside the inner pot chamber with a thermal buffer space formed by an inner wall and an outer wall. An inner pot having a wall structure and a concave center at the bottom is arranged to form a cavity surrounding the vertical cylinder, and a space between the outer bottom surface of the inner pot and the partition wall and the inner pot. A waste tire carbonization apparatus characterized in that a passage section for the heated gas generated in the combustion chamber is formed between the combustion chamber and the inner circumferential surface of the furnace body.