JP2003053291A - Direct steam heating decomposition treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time required until a substantial operation state is attained e.g. in starting up an apparatus. SOLUTION: In a direct steam heating decomposition treatment apparatus 1 equipped with a superheated steam supply means 2 and a treatment vessel 3 for containing an object to be treated and for thermally decomposing the object by directly heating with superheated steam supplied by the superheated steam supply means, a dry auxiliary heating means which is other than the superheated steam supply means and can elevate the inside temperature of the treatment vessel to about the treating temperature is installed. The object is one containing an organic chlorine compound. The treatment vessel has an inlet 30 for supplying the object and an outlet 31 for discharging the treated object. After the outlet, a cooling vessel 4 is installed so as to cool the decomposed object in a steam atmosphere. The dry auxiliary heating means has a fluid pathway 35 formed along the wall surface of the treatment vessel and partitioned from the inside of the treatment vessel, and a hot fluid is caused to flow through the pathway.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to thermal decomposition in which superheated steam is brought into direct contact with an object to be decomposed by heating, for example, when an organic chlorine compound is decomposed to be harmless, or when an organic matter is carbonized. Regarding the device.

[0002]

2. Description of the Related Art A conventional apparatus of this type has a structure in which an object to be treated is accommodated in a treatment tank or continuously supplied and delivered while superheated steam is supplied into the treatment tank. The object to be treated is subjected to a desired treatment by the heat of the superheated steam. That is, there are a batch type and a continuous type. For example, as a processing heat device used when decomposing organic chlorine compounds (dioxins) in dust ash with superheated steam, there is one described in JP-A-6-137540. The schematic configuration is such that the collected ash is supplied from the hopper to the treatment tank, agitated by the paddle in the treatment tank, and is transported while being in contact with the dry steam flowing in from the dry steam inlet. As a result, the organic chlorine compound contained in the collected ash is decomposed, and the treated ash is discharged together with the dry steam from the discharge chute of the treatment tank.

[0003]

In the conventional steam heating decomposition treatment apparatus using superheated steam, all heating depends on the heat of the steam. Therefore, in either batch type or continuous type, when the apparatus is started up, the supplied superheated steam is deprived of heat and condensed water is generated in the treatment tank.
It takes a long time for the dew condensation water to re-evaporate and the temperature inside the processing tank to rise to the predetermined decomposition temperature, and it cannot be easily put into a practical operating state. I understood it. An object of the present invention is to provide a direct steam heating decomposition treatment apparatus capable of shortening the time required to reach a substantially operating state when starting up the apparatus.

[0004]

Means for Solving the Problem The means of the present invention comprises heating and decomposing an object to be processed by containing a superheated steam supply means and containing the object to be processed and directly heating it with superheated steam supplied from the superheated steam supply means. In a direct steam heating decomposition treatment apparatus including a processing tank for processing, a dry auxiliary heating means different from the superheated steam supply means capable of raising the temperature in the processing tank to near the processing temperature is provided. (Claim 1).

According to this means, when the inside of the processing tank is at or near room temperature and has a considerably low temperature, for example, a dry auxiliary heating means is used when starting up the apparatus. The dry auxiliary heating means may be of a structure that does not bring moisture into the processing tank. The temperature in the processing tank is raised to near the processing temperature by the dry auxiliary heating means, and then superheated steam is supplied to perform a predetermined processing. Compared with the case of heating with superheated steam from the beginning, the generation of condensed water (condensation water) is eliminated and it is not necessary to re-evaporate condensed water with superheated steam. Is greatly shortened.

The object to be treated contains an organic chlorine compound, and the treatment tank has an inlet for supplying the object to be treated and an outlet for discharging the treated object. It is preferable that a cooling tank is provided continuously, and that the cooling tank cools the decomposed material in a steam atmosphere (claim 2).

The object to be treated containing an organic chlorine compound is decomposed by heating it in a steam atmosphere, but when cooled in the atmosphere, the organic chlorine compound is resynthesized in excess of the original amount in some cases. It is known that cooling is performed in a nitrogen gas atmosphere or a steam atmosphere in order to avoid re-synthesis. Therefore, in this configuration, the substance containing the organic chlorine compound is directly heated with superheated steam to decompose the organic chlorine compound,
Since the processed material can be cooled in the steam atmosphere cooling tank that follows the processing tank, there is no re-synthesis of the organic chlorine compound and the processed material containing the organic chlorine compound is surely free from the organic chlorine compound. Can be disassembled.

The dry auxiliary heating means is preferably provided with an electric heater along the wall surface of the processing tank (claim 3). With this configuration, temperature control is very simple. Separately, it is preferable that the dry auxiliary heating means is provided with a fluid passage that is separated from the inside of the treatment tank along a wall surface of the treatment tank, and causes a heat fluid to flow through the fluid passage (claim 4). . In this configuration, the fuel combustion gas can be used as the heat fluid as it is, or the hot water of the boiler for generating steam may be used separately, so that the thermal efficiency is good and the running cost can be kept low. In both cases, the inside of the processing tank is heated, but since water is not brought into the processing tank, the heating can be effectively performed and the time until the actual operation can be significantly shortened.

It is preferable that the processing tank has a supply port and a discharge port for the object to be processed, and is provided with a transfer means for transferring the object to be processed supplied from the supply port to the discharge port while stirring. (Claim 5). The treatment is performed uniformly by being heated uniformly by stirring, and continuous treatment is possible.

[0010]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention will be described with reference to FIGS. This embodiment is a processing apparatus that treats dust collecting ash containing an organic chlorine compound so as to be free of an organic chlorine compound. The processing apparatus 1 is composed of a superheated steam supply means 2, a processing tank 3, a cooling tank 4, and the like. As shown in the block diagram of FIG. 3, the superheated steam supply means 2 treats the boiler 10, a steam superheater 11 that heats the steam generated in the boiler 10 into superheated steam having a required temperature, and the superheated steam. The tank 3 is composed of a superheated steam supply passage 12 and the like.

The processing tank 3 comprises a cylindrical outer cylinder 13 made of steel and a rotor 14, and has an auxiliary heating means 15.
The outer cylinder 13 is arranged with its axis horizontal and has both end walls 1
It is formed by 6, 17 and the peripheral wall 18. The rotor 14 is provided with spiral blades 22 for transfer and stirring on the outer peripheral surface of a cylindrical body 21 having both end walls 19 and 20, and shafts 23 and 24 protruding outward at both ends along the axis thereof.
The rotor 14 is housed in the outer cylinder 13, the outer peripheral surface 25 is positioned coaxially with the inner peripheral surface 26 of the outer cylinder 13 and forms a processing space 27 by a predetermined distance, and the spiral blade 22 is present. The processing space 27 has a spiral shape. Both ends of the outer peripheral surface 25 of the rotor 14 are provided at both end walls 16 and 17
The shafts 23, 24 are in airtight contact with the end wall 16 of the outer cylinder 13,
A shaft bearing 24 is rotatably supported by 17, and one shaft 24 is connected to a rotary drive unit composed of a motor 28 with a reducer. The speed reducer-equipped motor 28 is supported by a support base 29 provided on the end wall 17 of the outer cylinder 13.

The processing space 27 of the processing tank 3 is partitioned from the outside, but has an inlet 30 for supplying the object to be processed, an outlet 31 for discharging the processed object, and a superheated steam supply port 32. The inlet 30 is provided above one end of the peripheral wall 18 so as to reach the processing space 27, and an object to be processed is substantially continuously supplied from a hopper (not shown) through the rotary valve 33 at an appropriate speed. It has become so. The outlet 31 is provided with a tubular passage member 34 communicating with the processing space 27 below the other end of the peripheral wall 18, and an inner hole of the passage member 34 communicates with a cooling tank 4 described later.

The auxiliary heating means 15 is an outer cylinder 13 of the processing tank 3.
It is a dry type provided along the outer side of the peripheral wall 18, that is, it does not allow water to enter the processing tank. The configuration is such that a spiral thermal fluid passage 35 is provided along the peripheral wall 18 of the outer cylinder 13, a thermal fluid at an appropriate temperature is supplied from a thermal fluid inlet 36 at one end thereof, and an outlet 37 at the other end. It is designed to guide you from the right place. Further, a heat insulating material layer 38 is provided so as to surround the outside of the thermal fluid passage 35. This processing tank 3 is
The outer cylinder 13 part is supported by the gantry 39.

The cooling tank 4 has an outer cylinder 40 having a size similar to that of the processing tank 3 and a rotor 41, and is constructed in substantially the same manner as the processing tank 3. That is, the outer cylinder 40 is arranged with its axis horizontal and is formed by both end walls 42, 43 and the peripheral wall 44, and the rotor 41 has the cylinder body 4 having both end walls 45, 46.
7 A spiral blade 48 is provided on the outer peripheral surface, and shafts 49 and 50 are provided at both ends to rotatably support the bearing on the outer cylinder.
1 are connected to each other to form a spiral cooling space 52 corresponding to the processing space 27. Further, outside the cooling space 52, a structure corresponding to the dry type auxiliary heating means 15 is provided, and a spiral cooling water passage 53 through which cooling water flows is provided as an auxiliary cooling means 54. The cooling tank 4 differs from the processing tank 3 in that it functionally cools, and does not have a heat insulating material layer.

The cooling space 52 is partitioned from the outside and has an inlet 54 and an outlet 55 communicating with the inside, a low temperature steam supply port 56, an exhaust port 57, and the like. The inlet 54 is connected to the tubular passage member 34 of the outlet 31 of the processing tank 3. The low temperature steam supply port 56 is connected to a pipe 58 so as to supply the saturated steam of 100 ° C. obtained in the boiler 10. The cooling water passage 53 has a cooling water inlet 59 at one end and a cooling water outlet 60 at the other end, and is connected to a water supply / discharge pipe line. In the cooling tank 4, an outer cylinder 40 is fixedly supported by a mount 39.

The apparatus 1 for decomposing an organochlorine compound thus constructed operates, for example, as follows. At the start-up at the beginning of the operation, while operating the auxiliary heating means 15, the dust collecting ash containing the organic chlorine compound which is the object to be treated is continuously supplied into the treatment space 27 of the treatment tank 3 through the rotary valve 33. . The object to be processed gradually moves toward the outlet 31 while being stirred by the rotation of the rotor 14. When the temperature in the processing tank 3 reaches, for example, 200 ° C., superheated steam of 400 ° C. is supplied from the superheated steam supply port 32. Although the temperature of the superheated steam thus supplied is lowered, it does not condense (condensate), heats the object to be processed, and maintains the processing space 27 of the processing tank 3 in a steam atmosphere. The rotation of the rotor 14 is adjusted so that the object to be initially supplied is discharged from the outlet 31 after a predetermined processing time has elapsed after the temperature in the processing tank 3 reached 400 ° C. Further, the heating by the auxiliary heating means 15 is stopped at an appropriate time, and the steady operation is overheated only by the heated steam.

The processed material discharged from the outlet 31 of the processing tank 3 subsequently enters the cooling space 52 of the cooling tank 4 and is cooled.
Since the saturated steam of 100 ° C. is supplied to the cooling space 52, the cooling space 52 is surely cooled in the steam atmosphere and then flows out from the outlet 55 to the outside. As a result, in the object to be treated, the organic chlorine compound is surely decomposed in the treatment tank 3, and the cooling tank 4
It is cooled without being re-synthesized inside, and the process ends.

In this apparatus, when the temperature of the processing tank 3 is low at about room temperature, the heating steam can be supplied after raising the temperature of the processing tank 3 by using the auxiliary heating means 15, so that dew condensation does not occur in the processing tank. The temperature range can be secured, and the time required to start up the device can be greatly shortened as compared with the case where the condensed water is re-evaporated with superheated steam.

In the above-mentioned embodiment, the apparatus for decomposing the organic chlorine compound is shown, but in the apparatus for carbonizing the organic matter, the cooling tank may be omitted in some cases, and the processing tank may be of a batch type constitution. May be adopted. Also,
The structure of the processing space 27 of the processing tank 3 may have various structures other than the spiral shape, and the point is that the structure can be such that the object to be processed can be transferred to the outlet at a proper speed while being stirred. Although the auxiliary superheating means 15 of the above-mentioned embodiment is formed in the spiral thermal fluid passage, it may be formed in a space in which the thermal fluid passes by a simple double cylinder, or it may be overheated by the thermal fluid. However, in some cases, an electric heater may be provided. The point is that a dry heating means in which water is not directly supplied into the processing space 27 may be used.

[0020]

According to the invention described in claim 1, the time until the start of the actual disassembling process can be shortened each time the continuous processing device is started up or the processed products of the batch processing device are replaced, and the work efficiency is improved. There is an effect that can be made. The invention described in claim 2 has an effect that there is no re-synthesis of the organic chlorine compound and the decomposition treatment can be performed so that the object to be treated containing the organic chlorine compound is surely free from the organic chlorine compound. Claim 3
The invention described in (1) has an effect that temperature control is very simple. The invention according to claim 4 has an effect that the running cost can be kept low. The invention described in claim 5 has an effect that processing is performed uniformly and continuous processing is possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a main part showing a schematic configuration according to an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a block diagram showing an overall configuration of the same embodiment.

[Explanation of symbols]

1 processor 2 Superheated steam supply means 3 treatment tanks 4 cooling tanks 10 boilers 11 Steam heating unit 12 Superheated steam supply passage 13 outer cylinder 14 rotor 15 Auxiliary heating means 16,17 End wall 18 peripheral walls 19, 20 End wall 21 cylinder 22 spiral blade 23, 24 axis 25 outer peripheral surface 26 Inner surface 27 Processing space 28 Motor with reducer 29 Support 30 entrance 31 exit 32 Superheated steam supply port 33 Rotary valve 34 Passage member 35 Thermal fluid passage 36 entrance 37 exit 38 Thermal insulation layer 39 mounts 40 outer cylinder 41 rotor 42, 43 End wall 44 Perimeter wall 45, 46 End wall 47 cylinder 48 spiral blade 49, 50 axes 51 Motor with reducer 52 Cooling space 53 Cooling water passage 54 entrance 55 exit 56 Low temperature steam supply port 57 Exhaust port 58 pipelines 59 Cooling water inlet 60 Cooling water outlet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27B 7/36 B09B 3/00 303L 7/38 ZAB (72) Inventor Shigeki Yamamoto Kanbe, Otsu-ku, Himeji-shi, Hyogo 3-12, Machi Nijigi Co., Ltd. Himeji East Factory F-term (reference) 3K061 NA01 NA07 4D004 AA37 AB06 AC04 CA15 CA22 CA32 CB21 CB31 CB32 4K061 AA08 BA12 DA05 EA03 EA07 FA06 FA11

Claims (5)

[Claims] 1. A direct system comprising: a superheated steam supply means; and a treatment tank for accommodating the treatment object and subjecting the treatment object to thermal decomposition treatment by directly heating with the superheated steam supplied from the superheated vapor supply means. In the steam heating decomposition processing apparatus, a direct steam heating decomposition processing apparatus is provided, which is provided with a dry auxiliary heating means different from the superheated steam supply means capable of raising the temperature in the processing tank to near the processing temperature. 2. The object to be processed contains an organic chlorine compound, and the processing tank has an inlet for supplying the object to be processed and an outlet for discharging the processed object. The direct steam according to claim 1, wherein a cooling bath is provided following the outlet, and the cooling bath is configured to cool the decomposed material in a steam atmosphere. Thermal decomposition treatment equipment. 3. The direct steam heating decomposition treatment apparatus according to claim 1, wherein the dry auxiliary heating means is provided with an electric heater along a wall surface of the treatment tank. . 4. The dry auxiliary heating means has a structure in which a fluid passage is provided along the wall surface of the treatment tank so as to be partitioned from the inside of the treatment tank, and a heat fluid is circulated in the fluid passage. The direct steam heating decomposition treatment apparatus according to claim 1 or 2. 5. The processing tank has a treatment object supply port and a discharge port, and is provided with a transfer means for transferring the treatment object supplied from the supply port to the discharge port while stirring. The direct steam heating decomposition treatment apparatus according to claim 1, claim 2, claim 3, or claim 4.