JP2001311584A - Rotary heating and processing method and processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate some disadvantages found when a processed item such as waste materials or the like is processed by a rotary heating and processing device, feeding of the processed item is started after a temperature in a rotary cylinder reaches up to a set processing temperature corresponding to an object of processing, and when an operation of a furnace is started, if it is tried to be heated up to a set temperature, it takes a substantial time until it reaches the set processing temperature due to the fact that the furnace is kept at its normal temperature, a starting of feeding the processed item is delayed, its working time is reduced and a working efficiency is decreased. SOLUTION: A helical hot air gas guiding plate 2c is arranged at an outer surface of a rotary cylinder 2 covered by a heating jacket 3 to aerate air while the hot air gas is being rotated. Its rotating direction is made opposite to a rotating direction of the rotary cylinder 2. When the operation is started, an initial heating set temperature Fh higher than a set processing temperature St is set, this is rapidly heated up to Fh and after it reaches the Fh value, the setting is returned back to the set processing temperature St and when it reaches the set processing temperature, feeding of the processed item is started and the time up to the starting of feeding is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary heat treatment method in which an object to be processed such as waste is put into a rotary cylinder (rotary drum) and the object is heated by an external heating means. Regarding the processing apparatus, particularly, at the initial stage of the heating operation of the rotating cylinder, for example, in order to shorten the heating time until the temperature reaches a predetermined set processing temperature in the rotating cylinder, the processing target is processed after the temperature reaches the set processing temperature. The present invention relates to a technique capable of securing a work time after loading when starting loading of articles.

[0002]

2. Description of the Related Art General waste such as municipal waste, industrial waste, shredder dust, vinyl chloride and other wastes contain a large amount of halogen substances (chlorine, bromine, iodine, fluorine, astatine), especially chlorine components. If heat treatment such as incineration is performed, chlorine-based gas (hydrogen chloride,
Chlorine) generates a large amount of gas, generates generated gas (exhaust gas), residue after incineration (processed ash), and produces highly toxic dioxins in fly ash in the exhaust gas, causing problems such as environmental pollution and deterioration of incineration equipment. generate. Therefore, the development of processing technology to solve these problems has been promoted. As the processing method, there is a method of burning the object to be treated in an incinerator, and a method of rotating the object to be heated instead of burning it in a rotary heating furnace. Into a rotating cylinder (rotary drum, rotary kiln) and heat (for example,
There is known a method of performing heat treatment at a temperature suitable for purposes such as external heating), detoxification treatment by drying, thermal decomposition treatment, dechlorination treatment and the like, carbonization, incineration, and other incineration.

[0003] The applicant of the present application uses a plurality of heat treatment furnaces for heating the rotating cylindrical body by external heating means using hot gas, and heats an object to be processed in a first heat treatment furnace to analyze halogen substances. Then, the object to be treated from which the halogen substance has been removed is carbonized (or incinerated) in another second heat treatment furnace to reduce the volume, and the carbide containing no halogen substance is taken out and reused. (Japanese Unexamined Patent Publication No.
1-211040, JP-A-11-211102).

Further, in a similar heat treatment furnace, an object to be treated and a treatment agent for an alkali substance are heat-treated in a first heat treatment furnace to decompose and precipitate a halogen substance and simultaneously react with the treatment agent to be harmless. By generating chloride, the generated gas and the residue are rendered harmless, and then the detoxified object is carbonized (ashed) in a second heat treatment furnace to reduce the volume, thereby reducing the halogen substance. It has also been proposed to take out carbides containing no iron and make them reusable (Japanese Patent Laid-Open No. 11-226).
545-JP-A-11-226548).

[0005] Fig. 6 is a conceptual diagram of the basic structure of a rotary heat treatment apparatus for performing the detoxification treatment. In the figure, reference numeral 10 denotes a first heat treatment furnace, and reference numeral 20 denotes a second heat treatment furnace.

The first heat treatment furnace 10 includes a rotatable rotating cylinder 11, a heating jacket 12 for forming a gas duct on the outer periphery of the rotating cylinder 11, and heating the rotating cylinder 11 by introducing a hot gas. A supply port 13 provided at one end of the rotating cylindrical body 11 for supplying the object to be processed into the rotating cylindrical body 11, and a discharge port 14 provided at the other end of the rotating cylindrical body 11. The rotating cylinder 11 is driven to rotate by rotation driving means (not shown).

The rotation driving means of the rotary cylinder 11 is composed of a normal drive motor, a drive gear, a driven gear provided on the rotary cylinder, and the like. The heating jacket 12 is fixed, and a mechanical seal P is applied to a rotating contact portion with the rotating cylindrical body 11.

Reference numeral 15 denotes a supply port 13 of the first heat treatment furnace 10.
The mixture of the object to be treated and the dechlorinating agent is introduced into the rotating cylinder 11 through a supply duct provided on the side.

The structure of the second heat treatment furnace 20 is substantially the same as the structure of the first heat treatment furnace 10, and includes a rotatable rotating cylinder 21 and a hot gas A heating jacket 22 for heating the rotating cylinder 21 by the introduction of the first cylinder, and one end of the rotating cylinder 21,
And a supply port 23 provided on the discharge port 14 side of the heat treatment furnace 10 for supplying an object to be processed into the rotary cylinder 21 and a discharge port 24 provided at the other end of the rotary cylinder 21. Have been.

Reference numeral 16 denotes an outlet 14 of the first heat treatment furnace 10.
Side and the supply port 23 side of the second heat treatment furnace 20,
1 shows an introduction duct for introducing an object to be processed in a first heat treatment furnace 10 from a first heat treatment furnace 10 to a second heat treatment furnace 20.

Reference numeral 25 denotes a melting tank (not shown) which surrounds the discharge port 24 side of the rotary cylindrical body 21 of the second heat treatment furnace 20 and heats the object to be treated (residue) in the second heat treatment furnace 20. This is a discharge duct that discharges to the like.

Rotating cylindrical body 11 of first heat treatment furnace 10
And the rotating cylindrical body 21 of the second heat treatment furnace 20 are vertically arranged, and although not shown, the rotating cylindrical body 11
Heating jackets 12 and 2 provided on the outer periphery of
Numeral 1 is supported and fixed by a fixing member.
A plurality of blades for transferring the mixture of the object to be treated and the dechlorinating agent while stirring are provided in the insides of the rotary cylinders 11 and 21, and the mixture is rotated by the rotation of the rotary cylinders 11 and 21 as shown by a dashed line in the figure. It is configured to transfer from the supply port 13 side to the discharge port 24 side.

A mechanical seal P is applied to the contact portions of the ducts 15 and 16 that are in rotational contact with the rotating cylinder 11 and the contact portions of the ducts 16 and 25 that are in contact with the rotating cylinder 21.

Reference numeral 30 denotes a hopper. The crushed object and a dechlorinating agent composed of an alkaline substance are mixed and thrown into the hopper 30, and can be supplied from the supply port 13 of the rotating cylinder 11 into the rotating cylinder 11. And

The hopper 30 may have both the function of crushing the object to be treated and the function of mixing the dechlorinating agent, and may mix the dechlorinating agent while crushing the solid, The material and the dechlorinating agent may be mixed and charged into the hopper 30.

Reference numeral 31 denotes a hot blast stove, for example, LNG, LP
A fuel such as G or petroleum is burned to generate hot air gas.
This hot blast gas is supplied to the rotating cylinder 21 of the second heat treatment furnace 20.
After being supplied into the heating jacket 22 provided on the outer periphery of the heating cylinder 22 and heating the rotating cylindrical body 21, it is fed into the heating jacket 12 of the rotating cylindrical body 11 of the first heat treatment furnace 10 through the connecting pipe 26. At this time, fresh cooling air is taken into the connecting pipe 26 to adjust the temperature of the hot gas. Reference numeral 27 denotes the adjusting means.

Numeral 32 is a decomposition gas processing means, which is a gas combustion furnace,
It has purification means such as exhaust gas cooling means and bag filters,
The hot air gas after heating the first heat treatment furnace 10 and the decomposition gas (dry distillation gas) generated during the heat treatment in the first and second heat treatment furnaces 10 and 20 are introduced and burned. Cool the gas, clean it with a bag filter and discharge.

In the heat treatment of the object to be treated such as waste, the object to be treated is crushed in advance by a crusher, and an alkali substance as a dechlorinating agent is added to the object to be treated and mixed. This dechlorinating agent is used in any of a lump, a plate, a porous form, a powder, a suspension, or a combination thereof.

The materials to be treated include various kinds of wastes (general wastes, industrial wastes, etc.), sludge, incinerated ash, fly ash, contaminated soil, building waste, various shredder dusts, metal scraps, and the like. is there.

Next, the hot blast gas generated in the hot blast stove 31 is
The heat is supplied to the heating jacket 22 and the heating jacket 12, and the insides of the first heat treatment furnace 10 and the second heat treatment furnace 20 are brought into a heating state. The mixture of the agents is supplied from the hopper 30 through the supply port 13 into the rotary cylinder 11 of the first heat treatment furnace 10. The rotating cylinder 11 is driven to rotate by a rotation driving means (not shown).

The heat treatment in the first heat treatment furnace 10 is for carrying out a drying and dechlorination treatment, for example, by setting the treatment temperature to 350 ° C. for heating, and in the second heat treatment furnace 20. In the heat treatment in, when the volume reduction treatment by carbonization is performed, the heating is performed with the set treatment temperature set to 600 ° C.

The temperature of the second heat treatment furnace 20 is controlled by controlling the amount of fuel supplied from the hot blast stove 31. The temperature control of the first heat treatment furnace 10 is provided in the connecting pipe 26. The adjustment is performed by controlling the introduction amount of the temperature adjusting air by the adjusting means 27.

The heat treatment in the first and second heat treatment furnaces is not a "combustion and incineration", but a carbonization treatment and a "steaming and pyrolysis" treatment. And reacts with the treating agent to form harmless salts.

As the treating agent to be mixed or added with the article to be treated, use is made of an alkaline substance which produces a harmless chloride by reacting at least with HCl (hydrogen chloride). For example, JP-A-9-155326, JP-A-10-43731, and JP-A-10-235186, which the applicant of the present application previously filed,
As shown in JP-A-10-235187, alkaline earth metals, alkaline earth metal compounds, alkali metals, and alkali metal compounds, specifically, calcium, lime, slaked lime, calcium carbonate, dolomite, silicate (calcium silicate) Sodium bicarbonate, sodium carbonate, sodium sesquicarbonate, natural soda, sodium hydroxide,
One kind is selected from potassium hydroxide, potassium hydrogen carbonate, and potassium carbonate, or several kinds are mixed and used. As an amount to be used, 5 to 30% by weight based on the material to be treated is mixed or added.

For example, sodium bicarbonate (Na
When HCO ₃ ) is used, a decomposition gas of the HCl component is generated in the first heat treatment furnace 10, but immediately reacts with sodium carbonate to (NaHCO ₃ ) + (HCl) →
(NaCl) + (H ₂ O) + (CO ₂ ), producing harmless sodium chloride (NaCl) and eliminating harmful HCl from the decomposition gas. Thereby, the detoxification of the HCl component in the decomposition gas and the detoxification of the residue are simultaneously performed.

The object to be treated after the harmful components are precipitated is sent into the supply port 23 of the rotary cylinder 21 of the second heat treatment furnace 20 through the introduction duct 16, where the temperature at which the object is carbonized is increased. The carbonization treatment is performed by heating to the above set treatment temperature of 600 ° C.

On the other hand, the exhaust gas generated in the first and second heat treatment furnaces 10 and 20 is introduced into a decomposed gas combustion means 32 and burns at a temperature of 800 ° C. or more, and removes tar components and residual harmful substances. Decompose and remove.

The set processing temperature of the first and second heat treatment furnaces 10 and 20 is the temperature inside the rotary cylinder, for example, as previously proposed by the present inventor and disclosed in Japanese Patent Application Laid-Open No. H11-30943.
As disclosed in No. 1, a temperature detection sensor composed of a penetrating pipe extending in the axial direction of the rotating cylinder is provided in the rotating cylinder to detect the temperature in the rotating cylinder, and the set processing temperature is Using the detection signal, the fuel supply to the hot blast stove 31 is controlled.

The applicant of the present invention has also proposed a heating apparatus using a hot gas which has means for effectively heating the above-mentioned rotary cylinder (Japanese Patent Laid-Open No. 11-26397).
8). This heat treatment device is to put the object to be processed into the rotating cylindrical body, in order to effectively heat the object to be processed,
In order to use a hot gas and to increase the heat receiving area from the hot gas, a helical projection, a flat projection, and a wavy projection are formed on the outer surface of the rotating cylindrical body as a heat receiving increasing means. By effectively increasing the heat receiving area of the cylindrical body, the cylindrical body is effectively heated, and the heat treatment of the object to be processed is efficiently realized.

[0030]

The heat treatment apparatus using hot gas disclosed in Japanese Patent Application Laid-Open No. H11-263978 according to the above proposal is provided with means for increasing heat reception formed by irregularities on the outer surface of a rotating cylindrical body. There is an effect that the heat generated by the hot gas can be efficiently received by the cylindrical body.

However, when an object to be treated such as waste is heat-treated in a discontinuous manner, for example, the heating operation of the rotary heating apparatus is started at 8:00 in the early morning, and the heating operation is stopped at 5:00 in the evening. When performing heat treatment of the workpiece in a cycle,
At the start of operation in the morning, the heat treatment furnace, ducts, and other equipment are completely cooled to room temperature, and these equipments are heated at the time of initial heating. (For example, drying / desalting treatment, 350 ° C., carbonizing treatment, 600 ° C.), it takes a considerable time to raise the temperature. This is the same in the rotary heating device shown in FIG.

In the initial stage of heating, in order to quickly raise the processing temperature to the set processing temperature, heating is performed in the absence of the processing object, and the charging of the processing object into the rotating cylinder is started after the processing processing temperature is reached. Therefore, the start of loading of the workpiece is delayed by that much,
Although the processing time of the object to be processed per day is shortened and the processing amount is reduced by that amount, the working efficiency is reduced. However, no consideration has been given to securing such working time.

Therefore, according to the present invention, in the rotary heating apparatus using the hot air gas as described above, heat is effectively received from the hot gas to effectively heat the object to be processed, and the input of the object to be processed is performed. It is an object of the present invention to provide a heat treatment method and a heat treatment apparatus for increasing the time required to reach a predetermined temperature (set processing temperature) at which processing can be started, securing processing work time, and increasing the efficiency of processing work on an object to be processed. And

[0034]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in order to shorten the time until the start of loading of an object to be processed, a normal setting process is carried out at the beginning of heating of a heating furnace. Set the initial heating set temperature to a temperature equal to or higher than the temperature and heat it, and form a hot air gas rotating ventilation means on the outer surface side of the rotating cylindrical body, raise the temperature to the initial heating set temperature in a short time, initial heating By returning to the normal set processing temperature after reaching the set temperature, the time required to reach the set processing temperature is shortened and the working efficiency is improved.

That is, in a rotary heating method in which an object to be processed is charged into a rotating cylinder having an external heating means using hot air gas and heated at a predetermined processing temperature, the external heating means supplies hot air gas. Heating is performed by helically rotating ventilation along the outer surface of the rotating cylinder, and the direction of rotation of the hot air gas is set to be opposite to the direction of rotation of the rotating cylinder, and at the beginning of heating of the rotating cylinder, After setting the initial heating set temperature higher than the set processing temperature and heating, after reaching the initial heating set temperature, the initial heating set temperature is held for a certain period of time, and then the preset processing temperature is reset and the heating is controlled. After reaching the set processing temperature, the object to be processed is charged.

As described above, by reversing the rotating direction of the hot air gas and the rotating direction of the rotating cylinder, the flow velocity of the hot air gas is increased, the heat receiving effect of the rotating cylinder is increased, and the rotating speed of the rotating cylinder is increased. Thus, the initial heating time can be further reduced, and the charging start time of the object can be shortened.

The heat treatment of the object to be treated according to the present invention can be applied to any one of drying, dechlorination, carbonization, and incineration, or a combination thereof.

The above-mentioned initial heating set temperature is desirably set to a temperature higher than the set processing temperature by 100 ° C. or more.

Further, the processing apparatus is a rotary heating processing apparatus for feeding an object to be processed into a rotary cylinder having an external heating means using hot air gas and performing heat treatment, wherein the external heating means comprises a rotary cylindrical body. A heating jacket provided on the outer periphery for introducing the hot air gas to heat the rotary cylinder, and a spiral formed by guiding the introduced hot air gas spirally provided on the outer surface of the rotary cylinder covered with the heating jacket; And a hot-air gas guide plate for rotating and passing the hot-air gas.The hot-air gas is introduced from one end of the heating jacket, and is drawn out from the other end of the heating jacket while rotating spirally along the outer surface of the rotating cylindrical body. The direction of rotation of the hot air gas is set to be opposite to the direction of rotation of the rotating cylinder, and the amount of hot air gas introduced into the heating jacket is controlled, and the set processing temperature and At the initial stage of heating, a temperature setting control means for setting an initial heating set temperature higher than the set processing temperature is provided, and at the initial stage of heating, heating is performed by setting an initial heating set temperature higher than the set processing temperature. After reaching, the initial heating set temperature is maintained for a certain period of time, and thereafter, the heating is controlled by setting the set processing temperature, and after reaching the set processing temperature, the workpiece is charged. .

Further, the speed control means for controlling the rotation speed of the rotary cylinder can be used at the initial stage of heating the rotary cylinder at a speed higher than the rotation speed in the steady operation until the initial heating set temperature is reached. Further, it is possible to further reduce the heating operation time until the temperature reaches the initial heating set temperature.

The above-mentioned hot-air gas guide plate may be formed as a continuous plate in a spiral shape, or may be formed discontinuously (by fragments).
It may be formed by arranging various plates spirally.

Further, one or both of the hot air gas guide plate and the rotating cylinder are formed of a striped steel plate having irregularities,
You may comprise so that the contact area with hot air gas may be increased.

[0043]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of the basic configuration of the rotary heating apparatus of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.
In these figures, reference numeral 1 denotes a heat treatment furnace. The heat treatment furnace 1 is a rotatable rotating cylindrical body 2 made of an iron-based metal member, and a hot air gas is formed by forming a gas duct on the outer periphery of the rotating cylindrical body 2. , A heating jacket 3 for heating the rotating cylindrical body 2, supporting rollers 4, 4 ′ for rotatably supporting the rotating cylindrical body 2 at both ends, and a rotation driving means 5 for rotating the rotating cylindrical body 2. The rotary cylinder 2 has a supply port 6 at one end for carrying in the workpiece, and a discharge port 7 at the other end for discharging the workpiece, as shown in FIG. A plurality of feed blades 2b inclined in the radial direction and the axial direction with respect to the axis of the rotating cylinder are provided. When the rotating cylinder 2 rotates, the workpiece is stirred from the supply port 6 side to the discharge port 7 side. While transporting. In addition, a hot air gas guide plate 2c is provided on the outer surface of the rotating cylinder, as described in detail with reference to FIGS.

The heating jacket 3 is fixedly supported by a fixing member (not shown), and a mechanical seal 8 is provided at a contact portion with the rotating cylindrical body 2.

Reference numeral 9 surrounds the supply port 6 of the rotary cylinder 2, and a supply-side enclosure for supplying an object to be processed into the rotary cylinder 2 via the guide plate 9 a, and 9 ′ surrounds the discharge port 7. Rotating cylinder 2
The outer enclosures 9 and 9 ′ are fixed, and a mechanical seal 8 is applied to a rotating contact portion with the rotating cylindrical body 2.

Reference numeral 41 denotes a hot blast stove for generating hot blast gas, which burns a fuel such as LNG, LPG or petroleum to generate hot blast gas, and supplies the hot blast gas into the heating jacket 3 to heat the rotary cylinder 2. Reference numeral 41a denotes a fuel tank, and 41b denotes a control valve for adjusting a fuel supply amount. This control valve 41b
Is controlled by the operation unit 41c.

The rotation driving means 5 includes, for example, a driving motor 5a, a driving gear 5b and a rotating cylinder 2 as shown in FIG.
It comprises a speed control means 5c (for example, an inverter) for controlling the rotation speed (rotation speed) of the driven gear 2a and the drive motor 5a provided on the outer periphery of the drive gear 5a and a power supply 5d thereof. In FIG. 1, the rotation driving means 5 uses a gear as a power transmission means from a driving motor 5a. However, as shown in FIG. 2, a roller chain (or a belt) 5f is connected to the roller chain 5f. It may be constituted by a sprocket (or pulley) 5e to be engaged.

Reference numeral 42 denotes a circulation blower which sucks hot air gas in the heating jacket 3 of the heat treatment furnace 1 and sends a part or all of the hot air gas to a hot air furnace 41 via a control valve 43 to circulate the hot air gas to circulate the hot air gas. Aim for effective use. Reference numeral 43a denotes an operation unit of the control valve 43. As another method of effectively using this hot air gas,
The control valve 43 may be a three-way valve, and part or all of the hot gas may be taken out through the discharge pipe 44, and the heat may be recovered and used by a heat exchanger or the like.

Reference numeral 45 denotes a sensor mounting device.
As disclosed in Japanese Patent Application Laid-Open No. 1-309431, a through pipe to which a temperature sensor is attached is extended in the axial direction inside the rotary cylindrical body 2, and a mounting frame (not shown) provided at a supply port 6 and a discharge port 7 is provided. ) To take out the temperature signal from the temperature detection sensor.

Reference numeral 46 denotes a temperature setting control means, which is a comparator 46a.
And a setting unit 46b capable of variably setting the initial heating set temperature and the set processing temperature. The comparing unit 46a compares a temperature detection signal from the temperature detection sensor with a setting signal of the setting unit 46b, and outputs a difference signal. Amplify and control the control valve 41b via the operation unit 41c, control the fuel supply amount, control the amount of hot air gas introduced, and automatically control the temperature inside the rotary cylinder to the set temperature. .

The amount of circulating hot gas introduced into the hot blast stove 41 is controlled simultaneously with the above-described control of the fuel supply amount or by operating the operating portion 43a of the control valve 43 as necessary. When the temperature of the hot blast gas is to be rapidly lowered, fresh air is sent into the hot blast stove 41.

Numeral 47 denotes a decomposition gas processing means which has the same configuration as the decomposition gas processing means 35 of FIG.

FIG. 3A is an explanatory view of the hot air gas rotary ventilation means according to the present invention. The hot air gas rotary ventilation means has a heat receiving effect on the outer surface of the rotary cylindrical body 2 covered with the heating jacket 3. Spiral hot air gas guide plate 2 made of excellent metal
c is fixed, and the hot blast gas introduced from the hot blast stove 11 is guided so as to ventilate while rotating the outer periphery of the rotating cylindrical body 2 in a spiral shape. Then, as shown in FIG. 2, the rotation direction of the hot air gas is set to be a clockwise direction shown by (b) opposite to the counterclockwise direction of the rotation direction (a) of the rotary cylinder 2.

By making the directions opposite to each other, the relative velocity between the hot air gas and the rotary cylinder increases, the flow velocity of the hot air gas increases, and the contact area of the hot air gas in contact with the hot air gas guide plate 2c is increased. The hot air gas guide plate 2c receives the heat of the hot air gas efficiently and
Is conducted.

Therefore, the rotating cylinder 2 is
The heat is efficiently heated by the heat received from the outer surface and the heat received from the hot air gas guide plate 2c. In addition, the temperature rises rapidly at the beginning of the rotation operation, and reaches the predetermined set processing temperature inside the rotary cylinder in a short time. Thus, the time required for raising the temperature can be shortened.

The hot air gas guide plate 2c may be formed as a continuous plate in a spiral shape, or may be formed by arranging fragmentary plates in a spiral shape.

FIG. 3B shows a case where the rotary cylinder 2 is formed of a striped steel plate and a hot air gas guide plate 2c is provided on the outer surface thereof.
Irregularities are formed on the surface of the rotating cylinder 2, the surface area in contact with the hot air gas is increased, and the heat receiving effect of the rotating cylinder is further enhanced. Similarly, if irregularities are formed on the surface of the hot air gas guide plate 2c to increase the heat receiving area, the heat receiving effect can be further enhanced.

FIG. 3C shows another embodiment of the hot blast gas rotating ventilation means, in which the height of the hot blast gas guide plate 2c is shown in FIG.
(A) and (B), the auxiliary guide plate 3a is provided in the heating jacket 3 between the pitches to make the hot air gas flow path longer. The height of the auxiliary guide plate 3a is
When the hot-air gas guide plate 2c rotates, the hot-air gas guide plate 2c is set to a height that does not come into contact with the hot-air gas guide plate 2c, and a predetermined interval L is provided.
The auxiliary guide plate 3a may have a spiral shape or a ring shape.
By lengthening the flow path of the hot air gas in this way, the heat receiving effect of the rotating cylinder and the hot air gas guide plate is enhanced.

When the auxiliary guide plate 3a is provided in FIG. 3 (A) or (B), as shown by a dotted line in FIG. 3 (B), the height L is set so as not to contact the hot air gas guide plate 2c. Is provided on the heating jacket 3.

The auxiliary guide plate 3a may be formed in a spiral shape with a pitch smaller than the pitch of the hot air gas guide plate 2c as shown in FIG. 3A, or may be formed at the same pitch. Further, it may be ring-shaped. Further, the heating jacket 3 or the auxiliary guide plate 3a may be formed by a stripe net plate.

Although not shown in detail, the outer surface of the heating jacket 3 is covered with a heat insulating material am to prevent heat dissipation from the outer surface of the heating jacket 3.

In the heating treatment of the object to be treated according to the present invention, at the start of the first heating operation (at the beginning of heating), first, the rotary cylindrical body 2 is driven to rotate by the rotary driving means 5 and the hot blast furnace 4 is heated.
1 generates hot air gas and sends it into the heating jacket 3. At this time, an initial heating set temperature is set by the setter 46b of the temperature setting controller 46. This initial heating set temperature is set to a temperature that is 100 ° C. or higher than the set processing temperature during the steady operation. Hereinafter, this processing method will be described with reference to the characteristic diagram of FIG.

FIG. 4 shows the temperature (° C.) on the vertical axis and the heating operation time (T) on the horizontal axis, wherein A represents the present invention and B represents the conventional characteristics.

Now, the rotating cylinder 11 of the heating furnace 1 shown in FIG.
Assuming that the internal temperature is (a) and the temperature in the heating jacket 12 is (b), the temperature (a) in the rotating cylinder is a condition necessary for stably heating the object to be processed. (B) is a condition necessary to secure the temperature (b) in the rotating cylinder. However, since the heating jacket has external heat radiation, the temperature (b) in the heating jacket is equal to the temperature (b) in the rotating cylinder. ) More generally at higher temperatures.

Therefore, in the present invention, at the start of the heating operation of the heating furnace in the rotary heating apparatus, the initial heating set temperature Fh in the rotary cylinder is higher than the set processing temperature St in the rotary cylinder by 100 ° C. or more (for example, + 500 ° C.). ℃) Set the heating temperature. This set processing temperature St is set to a temperature suitable for processing purposes such as drying / dechlorination, carbonization, and incineration.

Then, taking drying and dechlorination as an example, if the set processing temperature St suitable for this processing purpose is 350 ° C., the initial heating temperature Fh in the rotating cylinder is set to 850 ° C. and set to 850 ° C. Heat briefly (t ₁ ) until reached.
After the temperature reaches 850 ° C., the temperature is held for a certain time (t ₂ ), and then the setting is returned to the normal set processing temperature of 350 ° C.
At the time (t ₃ ), charging of the object to be processed is started.

The heating and temperature are controlled by detecting the temperature inside the rotating cylinder with the temperature detection sensor provided in the sensor mounting device 45 as described above, and comparing the temperature detection signal with the setting signal of the setting device by the comparator 46a. , And a signal proportional to the deviation signal is used as a control valve 41b,
The temperature (b) in the heat jacket 3 is controlled by controlling the amount of fuel supplied to the hot blast stove 41 and the amount of circulating hot gas to be controlled by controlling the 43a.

In the present invention, as shown by the solid line A in FIG.
Initial heating set temperature F at the beginning of heating in the heating operation of the processing furnace
After setting the heating time and reaching the initial heating set temperature Fh
(T ₁) And the temperature Fh for a predetermined time (t_Two) Hold the next
Then, the heating is controlled by setting the processing temperature to the original set processing temperature St.
After reaching the set processing temperature St,
Since the loading of materials is started,
The time until the start of the input of physical material is t₁+ T_Two+ T_ThreeBecomes

On the other hand, when the temperature inside the rotary cylinder is set to the set processing temperature St from the beginning and heated as in the prior art, as shown by the dotted line B in FIG. operation time is t ₄ of. Therefore, the present invention, when compared with the conventional method, is t ₄ − (t ₁ + t ₂ + t ₃ ) =
t ₅ hours can only put the start time of the workpiece is faster.

On the other hand, the hot-air gas that has passed through the heating jacket 3 is guided along the hot-air gas guide plate 2c, and rotates while spiraling in a direction opposite to the rotation direction of the rotary cylinder 2.
The inside of the rotating cylinder 2 is heated via the rotating cylinder.

The rotating direction of the hot air gas is
Since the direction of rotation is opposite to the direction of rotation, the flow velocity of the hot-air gas increases, and the hot-air gas flows while being pressed by the hot-air gas guide plate 2c, and the rotating cylinder 2 transfers the heat of the hot-air gas to the outer surface of the rotating cylinder. Heat is received by both hot air gas guide plates and the temperature rises rapidly. Furthermore, if the rotation speed of the rotating cylinder is increased at the beginning of the heating operation of the heating furnace and the flow rate of the hot air gas is increased, the heat receiving effect of the hot air gas guide plate 2c is further enhanced, and the initial heating set temperature Fh in the rotating cylinder is reached. The time required for the temperature to rise can be further reduced as shown in FIG.

That is, in FIG. 5, as in FIG. 4, the initial heating set temperature Fh is set, and at the beginning of the heating operation, the rotation speed of the rotary cylindrical body 2 is set to the steady operation by the speed control means 5c of the rotation drive means 5. Higher than the normal rotation speed (for example, 3 to 5).
This is the case when the motor is operated at the rotation speed.

The time required to reach the initial heating set temperature Fh is (t ₁ ), which is shorter than t ₁ in FIG.

[0075]

According to the present invention, a spiral hot air gas guide plate 2c is provided on the outer surface of the rotary cylindrical body 2 covered with the heating jacket 3 as described above, so that the hot air gas is passed while rotating. At the same time, the rotation direction is opposite to the rotation direction of the rotary cylinder 2 so that the heat of the hot air gas can be effectively received, and the initial heating set temperature in the rotary cylinder at the start of the heating operation is usually set to Set the heating temperature to a temperature higher than the set processing temperature, and after reaching the initial heating set temperature, return the setting to the set processing temperature and heat, and after reaching the set processing temperature, place the workpiece in the rotary heating processing furnace. Since the charging is performed, heating can be performed at an early stage to the temperature at which the workpiece is charged, and the time required to raise the temperature of the heat treatment furnace can be reduced. Therefore, since the working time after the loading can be ensured, it is possible to surely perform the processing of a predetermined amount of the object to be processed, and to achieve effects such as stabilizing the working rotation.

Further, at the beginning of the heating operation of the heat treatment furnace, the rotation speed of the rotating cylindrical body is increased to increase the flow velocity of the hot blast gas so as to enhance the heat receiving effect of the hot blast gas guide plate 2c. The time required for raising the temperature to the set heating temperature can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a basic configuration of a heat treatment furnace of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is an explanatory view of a hot-air gas rotating ventilation unit.

FIG. 4 is an explanatory diagram of a heating operation time until the start of charging of an object according to the present invention.

FIG. 5 is an explanatory diagram of a heating operation time until the start of charging of an object according to the present invention.

FIG. 6 is a conceptual diagram of a conventional heat treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat treatment furnace 2 ... Rotating cylindrical body 2c ... Hot air gas guide plate 3 ... Heating jacket 4 ... Support roller 5 ... Rotation drive means 5c ... Speed control means 6 ... Supply port 7 ... Discharge port 8 ... Mechanical seal 9, 9 ' ... Supply-side enclosure 41 ... Hot stove 42 ... Circulation blower 43 ... Control valve 44 ... Discharge pipe 45 ... Sensor mounting device 46 ... Temperature setting control

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C10B 53/00 F26B 17/32 G ZAB F27B 7/08 F26B 17/32 7/16 F27B 7/08 7/24 7 / 16 7/26 7/24 7/42 7/26 F27D 19/00 A 7/42 B09B 3/00 ZAB F27D 19/00 303H (72) Inventor Takayuki Tanabe 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Stock Company Meidensha F-term (Reference) 3L113 AA06 AA09 AB05 AB06 AC04 AC54 AC58 AC68 BA19 BA36 CA08 CB03 DA01 DA10 4D004 AA08 AA28 AA46 AB06 AC04 CA24 CA42 CB09 CB36 DA02 DA03 DA06 DA13 DA20 4H012 HA03 HB03 4K06A A4A AA08 BA12 CA21 DA09 EA07 GA02

Claims (7)

[Claims] 1. A rotary heating method in which an object to be processed is charged into a rotating cylinder having an external heating means using hot air gas and heated at a predetermined set processing temperature. Heating is performed by helically rotating ventilation along the outer surface of the rotating cylinder, and the direction of rotation of the hot air gas is set to be opposite to the direction of rotation of the rotating cylinder, and at the beginning of heating of the rotating cylinder, Heating by setting an initial heating set temperature higher than the set processing temperature, after reaching the initial heating set temperature, holding the initial heating set temperature for a certain period of time, then setting the set processing temperature to control heating, After reaching the set processing temperature, an object to be processed is charged. 2. The heat treatment of the object to be processed includes drying, dechlorination,
The method according to claim 1, wherein the heat treatment is performed for any of carbonization and incineration. 3. The method according to claim 1, wherein the initial heating set temperature is at least 100 ° C. higher than the set processing temperature.
The rotary heating method according to the above. 4. A rotary heat treatment apparatus for subjecting an object to be processed into a rotary cylinder having an external heating means using hot air gas and heating the same, wherein the external heating means is provided on the outer periphery of the rotary cylinder and is provided with a hot air A heating jacket that introduces gas to heat the rotating cylinder, and a hot air that is spirally provided on the outer surface of the rotating cylinder covered with the heating jacket and guides the introduced hot air gas to spirally rotate and ventilate. The hot air gas is introduced from one end side of the heating jacket, and is drawn out from the other end side of the heating jacket while rotating spirally along the outer surface of the rotating cylindrical body. The rotating direction is set to be opposite to the rotating direction of the rotating cylinder, and the amount of hot air gas introduced into the heating jacket is controlled, and the setting process temperature and the setting process are performed at the beginning of heating. Temperature setting control means for setting an initial heating set temperature higher than the processing temperature, and at the beginning of heating, heating is performed by setting an initial heating set temperature higher than the set processing temperature, and after reaching this initial heating set temperature, A rotary heating processing apparatus characterized in that the initial heating set temperature is held for a certain period of time, and then the set processing temperature is set and the heating is controlled, and after reaching the set processing temperature, the workpiece is charged. . 5. A speed control means for controlling the rotation speed of the rotary cylinder, wherein the rotary cylinder rotates at a speed equal to or higher than the rotation speed in the steady operation during the initial heating of the rotary cylinder until the initial heating set temperature is reached. 5. The rotary heating apparatus according to claim 4, wherein the rotation speed during normal operation is controlled after the initial heating set temperature is reached. 6. The rotary heating apparatus according to claim 4, wherein the hot air gas guide plate is formed by arranging a continuous or discontinuous plate spirally on the outer surface of the rotary cylinder. . 7. The method according to claim 4, wherein one or both of the hot air gas guide plate and the rotating cylinder are formed of a striped steel plate having an uneven surface. Rotary heat treatment equipment.