JP6133485B1 - Metal scrap processing equipment - Google Patents

Abstract

[PROBLEMS] To remove various deposits such as cutting fluid, paint, and rust preventives adhering to metal scraps by heat and decomposition in a short time and efficiently, prevent oxidation, and have high yield and high throughput. Providing a metal scrap disposal device that excels in resource and energy savings, and is compact, safe, easy to handle, and saves space. A metal scrap conveying section, a metal scrap supplying section connected to the upstream side of the metal scrap transport section, a metal scrap discharging section connected to the downstream side of the metal scrap transport section, and a metal scrap transport section. A steam supply section for supplying saturated steam and / or superheated steam to the metal scrap conveying section, a cylindrical conveying path, an agitating section inserted in the conveying path, and an upper surface of the peripheral wall of the conveying path One or more gas discharge ports formed on the side and a gas guide that communicates with the gas discharge ports on the outside of the peripheral wall of the transfer path and discharges the decomposition gas generated by the thermal decomposition of the metal scrap deposits from the metal scrap transfer unit And a passage. [Selection] Figure 2

Description

  The present invention relates to a cutting fluid such as a cutting oil or a grinding oil adhered to metal scrap generated when processing a metal such as aluminum, zinc, copper, or iron, or an alloy such as brass, aluminum, or stainless steel, or disposal of these metal products. Further, the present invention relates to a metal scrap treatment apparatus that thermally decomposes various deposits such as paints and rust inhibitors with saturated steam and / or superheated steam.

Conventionally, metal chips generated by metal processing are melted and regenerated in a melting furnace and reused as each metal resource. However, cutting oil, metal fine powder generated during metal processing, bite scraps, and the like adhere to the surface of the metal chips generated during metal processing such as cutting and grinding. For this reason, when reclaiming such metal chips as a bare metal, it is necessary to dry and remove the cutting oil adhering to the metal chips as a preceding process. As the drying method, a simple drying method in which cutting oil is evaporated by hot air of 400 ° C. to 600 ° C. is mainly used.
However, with such a simple drying method, the oil content of the cutting fluid is not completely dried. Oil and carbon components (such as coke) derived from the cutting fluid remain on the surface of the metal chips, and the metal chips are put into the melting furnace. When doing so, there was a problem that black smoke and ignition were likely to occur.
There is also a risk of dust explosion due to dust generated by stirring the metal chips during drying, metal dust or bite scraps adhering to the surface of the metal chips.
Therefore, there has been a demand for a drying method and a drying apparatus with low environmental load that can recycle these metal chips with high efficiency.
The applicant of the present application made an extensive research and applied (Patent Document 1), and the metal chips with cutting oil, metal scrap, and bite scrap adhered to a porous material, solid acid catalyst, solid base catalyst in a drying furnace. A method for drying metal chips is disclosed in which any one or more of them is mixed with a drying treatment material and the oil component derived from the cutting fluid is dried with the drying treatment material.

JP2015-42936A

(1) The method for drying metal chips of (Patent Document 1) is to mix the metal chips to which the cutting fluid is adhered and the drying treatment material in a drying furnace, and dry the cutting fluid adhered to the metal chips. By catalytic cracking, the residual carbon in the metal chips after drying is remarkably low, and it is possible to prevent the occurrence of black smoke and ignition when the metal chips are put into the melting furnace. The degree of oxidation of the metal chips was low, and the metal regeneration yield was excellent.
(2) However, it is necessary to control the supply amount of the dry treatment material, and it is difficult to completely separate the dried metal chips from the dry treatment material. In addition, it is possible to remove various deposits such as cutting fluid, paint, and rust preventives that have adhered to various types of metal scraps with simple control by heat and decomposition in a short time, resulting in high yield and resource saving. There has been a strong demand for the development of a metal waste disposal apparatus that is excellent in energy saving and compact and excellent in safety, handling, and space saving.

  The present invention responds to the above-mentioned demand, and it can remove various deposits such as cutting fluid, paint, and rust preventives adhering to metal scraps by heat and decomposition reliably and efficiently in a short time to prevent oxidation. The purpose of the present invention is to provide a metal scrap disposal apparatus that is high in yield, has high processing capacity, is excellent in resource saving and energy saving, and is compact and excellent in safety, handling, and space saving.

Means for solving the problems, and actions and effects obtained thereby

In order to achieve the above object, the metal scrap disposal apparatus of the present invention has the following configuration.
The metal scrap processing apparatus according to claim 1 of the present invention is a metal scrap processing apparatus that thermally decomposes deposits of metal scrap with saturated steam and / or superheated steam,
A metal scrap conveying section, a metal scrap supplying section connected to the upstream side of the metal scrap transport section, a metal scrap discharging section connected to the downstream side of the metal scrap transport section, and the metal scrap transport section. A steam supply pipe disposed on one side of the transport path and connected to the steam supply section for supplying the saturated steam and / or the superheated steam, and a hole is formed in the side wall of the transport path in communication with the steam supply pipe. A plurality of vapor injection ports formed on the upper surface side of the peripheral wall of the conveyance path, the metal scrap conveyance unit, the cylindrical conveyance path, the stirring unit inserted in the conveyance path One or more formed gas discharge ports and the gas discharge port communicated with the gas discharge port outside the peripheral wall of the transfer path, and the decomposition gas generated by the thermal decomposition of the deposits of the metal scrap is discharged from the metal scrap transfer unit. And a gas conduction path.
This configuration has the following operations and effects.
(1) Scrap supply and / or superheated metal scrap supply section connected to the upstream side of the metal scrap transport section, metal scrap discharge section connected to the downstream side of the metal scrap transport section, and metal scrap transport section By having the steam supply part that supplies steam, the metal scrap supplied from the metal scrap supply part is transported by the metal scrap transport part and discharged from the metal scrap discharge part. Various deposits such as oil, paint, and rust preventive agent can be removed by thermal decomposition in a short time with saturated steam and / or superheated steam supplied from the steam supply unit, which is excellent in energy saving.
(2) Since the metal scrap conveyance unit has a cylindrical conveyance path and an agitation unit inserted in the conveyance path, saturated vapor supplied from the steam supply unit while conveying the metal scrap in the agitation unit and It is possible to reliably contact the superheated steam and the metal scrap, and to efficiently decompose the deposit attached to the surface of the metal scrap, thereby improving the efficiency and certainty of removing the deposit.
(3) One or more gas exhaust ports formed on the upper surface side of the peripheral wall of the transport path are connected to the gas exhaust port on the outer side of the peripheral wall of the transport path, and the metal scrap deposit is thermally decomposed. By providing a gas conduction path that discharges the cracked gas generated from the metal scrap conveying section, the cracked gas generated by the thermal decomposition of the metal scrap deposits is reliably and efficiently discharged from the gas discharge port. It can be smoothly moved along the passage and discharged out of the system from the metal scrap conveying section, and the decomposition gas discharge is excellent.
(4) The stirrer is inserted into the cylindrical conveyance path, so that there is less wasted space than a rotary kiln, etc., the device can be made compact, it is excellent in space saving, and there is little heat loss. Excellent heating efficiency.
(5) It is possible to remove metal waste deposits by thermal decomposition only with saturated steam and / or superheated steam without using a drying treatment material, etc. Is not attached, and there is no need for a mechanism or process for separating the dry processing material, etc., and it is possible to obtain metal scrap without deposits and to prevent deterioration due to oxidation. Excellent recyclability.
(6) Since it is possible to control the residence time of the metal scraps in the transport path only by controlling the number of revolutions of the stirring unit, according to the size, shape, bulk specific gravity or the kind of deposits of the metal scraps, By setting the necessary residence time, the deposits of metal scrap can be surely thermally decomposed, and the operability, versatility, and processing efficiency are excellent.
(7) Since the metal scrap transport unit has a steam injection port connected to the steam supply unit and formed on the peripheral wall of the transport path of the metal scrap transport unit, the saturated steam and It is possible to efficiently decompose the deposits of metal scraps by injecting superheated steam, and the heat decomposition efficiency and stability are excellent.
(8) When a plurality of steam injection ports are arranged along the longitudinal direction of the transport path, saturated steam and / or superheated steam can be efficiently distributed over the entire length of the transport path, and the contact efficiency with metal scraps can be improved. Since it can be increased, the supply amount of saturated steam and / or superheated steam can be reduced, and energy saving is excellent. In addition, when the steam injection port is arranged on the downstream end side of the transport path, the flow of saturated steam and / or superheated steam is countercurrent to the metal scrap transported along the transport path. The kimono and saturated steam and / or superheated steam can be reliably brought into contact and thermally decomposed, and the efficiency of the heat decomposition treatment is excellent.

Here, when the metal scrap supply unit includes a scraper conveyor, a screw conveyor, or the like, a large amount of metal scrap can be continuously processed, the apparatus can be easily automated, and the operability and work efficiency are excellent. The metal scrap supply unit may be provided with a shutter-type weighing damper.
In addition, the processing time in a metal waste conveyance part can be shortened by providing a preheating part in a metal waste supply part. Moreover, you may preheat using the decomposition gas and vapor | steam which generate | occur | produce in a conveyance path.
In addition, it is preferable to provide a slide gate etc. before and behind the metal scrap supply part. Thereby, it is because the airtightness of a metal scrap conveyance part can be raised, oxygen concentration can be controlled, and the oxidation of metal scrap can be prevented.
The stirrer of the metal scrap transporting part only needs to be capable of transporting along the transport path while stirring the metal scrap, and the shape and arrangement of the blades can be appropriately selected.

In order to adjust the size of the metal scrap, a shearing type (uniaxial shear crusher, etc.) or impact type (hammer crusher, etc.) pretreatment device that breaks or cuts the metal scrap is provided upstream of the metal scrap supply unit. May be. By adjusting the size of the metal scrap, it is easy to adjust the number of rotations of the motor that rotates the stirring unit, and the workability can be improved.
Metal scraps to be dried by the scrap metal processing equipment are generated when metals such as aluminum, zinc, copper and iron, and alloys such as brass, aluminum and stainless steel are machined by cutting or grinding. In addition to metal scraps, cutting scraps, shredder scraps, used scraps of metal products such as various cans, briquettes hardened with metal chips, die cast burr lump, etc. The material and shape are not particularly limited.
As cutting fluids used in metal processing, water-insoluble cutting fluids (N1, N2, N3, N4) and water-soluble cutting fluids (A1, A2, A3) in Japanese Industrial Standards (JIS K2241). Seeds) and mixtures thereof. In general, cutting oils are added with extreme pressure additives, emulsifiers (lubricants), rust inhibitors, anticorrosives, surfactants, antifoaming agents, preservatives, etc. as additives. May be included. The water-soluble cutting fluid is diluted with water and used, but may contain water in this way. The cutting fluid includes grinding oil as well as cutting oil.

The temperature of the saturated steam is preferably 100 ° C. to 200 ° C., the temperature of the superheated steam is preferably 150 ° C. to 600 ° C., and the supply pressure of the saturated steam and / or superheated steam is preferably 50 kPa to 500 kPa. As the steam supply unit, a superheated steam generator that further heats dry saturated steam generated by a boiler or the like and generates superheated steam having a higher temperature corresponding to the pressure of the saturated steam is preferably used. By opening and closing the valve, saturated steam and / or superheated steam can be selectively supplied to the metal scrap conveying section.
The steam supply unit is connected to the conveyance path of the metal scrap conveyance unit, and supplies saturated steam and / or superheated steam to the inside of the conveyance path. The connection position between the steam supply unit and the transport path can be selected as appropriate, and saturated steam and / or superheated steam can be injected from the desired position of the transport path into the transport path. In particular, when a plurality of steam injection ports are provided along the longitudinal direction of the transport path, the steam pressure per one steam injection port can be lowered to efficiently supply the steam, and the steam is supplied excessively. It can be prevented from being discharged from the transport path and has excellent energy savings. Further, by reducing the pressure of the steam injected from the steam injection port, it is possible to prevent scattering of fine powders such as aluminum, which has a risk of dust explosion, and is excellent in safety. In addition, since it becomes a very low oxygen atmosphere in superheated steam, there is little oxidation deterioration of a metal scrap, the yield of metal collection | recovery can be improved, and it is excellent in high quality and recyclability.

The metal scrap conveyance unit may be placed horizontally in the heating furnace. Since the outer periphery of the conveyance path of the metal scrap conveyance part is surrounded by a heating furnace, the conveyance path can be heated from outside by blowing hot air between the heating furnace and the conveyance path, and the temperature inside the conveyance path is reduced. The deposits can be decomposed by heating in a short time, and the efficiency is excellent. As a heating source for generating hot air, a burner, an electric heater or the like may be used, or exhaust gas generated after generating superheated steam or decomposition gas generated when pyrolyzing deposits is recovered. It is also possible to use exhaust heat after combustion. As for the temperature at the time of heating a conveyance path from the outside, 300 to 650 degreeC is preferable. As the temperature of the external heating becomes lower than 300 ° C., the temperature in the conveyance path also becomes lower, and the thermal energy necessary for the decomposition of oil etc. adhering to the metal scrap is to be covered with saturated steam and / or superheated steam, There is a tendency that the efficiency of heat decomposition and energy saving are liable to decrease, which is not preferable. Moreover, as the temperature of external heating becomes higher than 650 ° C., the temperature in the transport path also increases, and the metal scrap being transported tends to melt and easily adhere to the transport path, the stirring unit, etc. This is not preferable because it may lead to damage.
In addition, you may cover the outer periphery of a conveyance path with heat insulating materials (heat insulating material), such as urethane foam, polyethylene foam, and glass wool.

The pressure in the conveyance path is preferably maintained at atmospheric pressure or slightly positive pressure. Decomposition gas (combustible gas) is generated inside the conveyance path due to thermal decomposition of the deposits, and if negative pressure is taken, the outside air is sucked in, the oxygen concentration rises, and it may ignite and explode in the device Because there is.
The cracked gas generated by the thermal decomposition of the deposits is cooled by a heat exchanger and then collected by a wet scrubber, resulting in an unburned gas explosion or a fine powder such as aluminum discharged along with the cracked gas. It prevents dust explosion caused by, and is excellent in safety. The oil and water obtained by cooling the cracked gas can be emulsified and reused as fuel.
In addition, you may carry out a combustion process for the objective of the safe process of the decomposition gas generated by the thermal decomposition of a deposit | attachment, deodorizing, etc.
The number, shape, size, arrangement, and the like of the gas discharge ports can be selected as appropriate. As metal debris moves from upstream to downstream in the transport path, the deposits are heated and decomposed to generate decomposition gas. Therefore, the gas discharge port may be arranged at least on the downstream side of the transport path. preferable. In addition, when a plurality of gas discharge ports are provided over the entire length of the transport path, the decomposition gas can be discharged efficiently from the entire transport path.
Moreover, the gas conduction path only needs to be able to communicate with the gas discharge port outside the peripheral wall of the transfer path and discharge the decomposition gas from the metal scrap transfer section, and the position of the outlet can be selected as appropriate.
The number and arrangement of the steam injection ports can be selected as appropriate.
In addition, by making a hole in the peripheral wall of the transport path to form a steam injection port and connecting it to the steam supply unit on the outer peripheral surface side of the peripheral wall of the transport path, there is no protrusion inside the transport path, Interference can be prevented, and the gap between the stirring unit and the inner peripheral surface of the transport path can be reduced to prevent a short path of saturated steam and / or superheated steam.

Invention of Claim 2 is the metal scrap processing apparatus of Claim 1, Comprising: The said stirring part is a helical blade | wing arrange | positioned on the outer periphery of a rotating shaft, The longitudinal direction of the said rotating shaft, And a connecting stirrer arranged in parallel to connect and reinforce the outer peripheral side of the blade.
With this configuration, the following actions and effects are provided in addition to the actions and effects of the first aspect.
(1) The stirrer has a spiral blade disposed on the outer periphery of the rotating shaft and a connecting stirring unit disposed in parallel to the longitudinal direction of the rotating shaft to reinforce the outer peripheral side of the blade. It is possible to stir by scraping metal scraps at the connecting stirrer on the outer peripheral side of the blades close to the road, and the metal scraps and saturated steam and / or superheated steam are brought into contact with each other and adhered to the surface of the metal scraps. The deposit can be transported while being efficiently decomposed by heat, and is excellent in energy saving and deposit removal efficiency.
(2) Since the stirring unit has spiral blades, metal scraps in the transport path can be controlled simply by controlling the number of revolutions of the motor that rotates the stirring unit for metal scraps of various shapes and bulk specific gravity. It is possible to accurately heat and decompose the deposit by accurately controlling the residence time of the resin, and it is excellent in the reliability and stability of the heat decomposition treatment.
(3) The agitating part has a spiral blade disposed on the outer periphery of the rotating shaft and a connecting stirring unit disposed in parallel to the longitudinal direction of the rotating shaft to reinforce the outer peripheral side of the blade. It can maintain the same rigidity and transport efficiency as the feeder and the quantitativeness of the transport of metal scraps, and is excellent in the efficiency of thermal decomposition of deposits.
(4) Since the stirrer has a connecting stirrer that is arranged in parallel with the longitudinal direction of the rotating shaft and that reinforces the outer peripheral side of the vane, the strength of the stirrer can be improved. By reducing the thickness of the agitator, the friction between the outer peripheral portion of the blade and the inner surface of the conveyance path can be reduced, and the durability and long life of the metal scrap conveyance unit are excellent.
(5) The stirrer has a connecting stirrer that is arranged in parallel with the longitudinal direction of the rotating shaft and connects and reinforces the outer peripheral side of the blades, whereby the rigidity of the stirrer can be maintained, such as briquettes and die cast burrs, etc. It is possible to effectively prevent the occurrence of deformation and breakage of blades, and to reliably transport metal scrap, even if it is a lump of metal scrap or metal scrap of various shapes and specific gravity. Excellent reliability and reliability.
(6) Since the spiral blades of the stirring unit are disposed on the outer periphery of the rotating shaft, sufficient stirring can be ensured to prevent bending and deformation, and the stirring unit can be reliably rotated. Excellent stability.

  Here, the connection stirring part should just be what can fix the outer peripheral side of a helical blade | wing, and a shape, arrangement | positioning, etc. can be selected suitably. For example, rods such as square steel and round steel, or cylindrical members such as square pipes and round pipes may be used, but by using a plate-like member such as flat steel, the contact area with metal scraps Can be ensured, and scrap metal can be efficiently scraped to enhance the stirring effect. The connecting stirring unit can ensure rigidity by connecting and reinforcing adjacent blades along the longitudinal direction of the rotating shaft on the outer peripheral side of the spiral blade. In addition, although the number of connection stirring parts can be selected suitably, it is preferable to provide 2 thru | or 8 places at intervals in the circumferential direction. When the number of the connected stirring parts is only one, the blades are easily deformed, the rigidity of the whole stirring part is lowered, the bending is likely to occur, and the stirring effect tends to be lowered, and the number of the stirring parts is more than eight. As it becomes, the number of connected agitation parts that do not contribute to agitation increases, the weight of the whole agitation part increases, the energy required for rotation of the agitation part increases, and the metal scrap agitation efficiency and energy saving tend to decrease. Yes, neither is preferred.

According to a third aspect of the invention, a metal scrap processing apparatus according to claim 1, wherein the gas outlet of the scrap metal conveying portion, a plurality of arranged with equal spacing and pitch of the spiral of the vane It has a configuration.
With this configuration, the operation of claim 1, in addition to the effects, has the following operations and effects.
(1) Since a plurality of gas discharge ports of the metal scrap conveying unit are arranged at intervals equivalent to the pitch of the spiral blades, each of the gas discharge ports formed between the spiral blades during the rotation of the stirring unit The space and the gas discharge port are reliably communicated, and the cracked gas generated by the thermal decomposition of the deposits of the metal scrap can be discharged reliably and efficiently, and the discharge gas is reliably and efficiently discharged.

  Here, by arranging a plurality of gas discharge ports at intervals equivalent to the pitch of the spiral blades, each space formed between the spiral blades is surely formed during rotation of the stirring unit. Therefore, the cracked gas can be discharged from each gas discharge port reliably and efficiently.

A fourth aspect of the present invention is the metal scrap disposal apparatus according to the first or second aspect, wherein a plurality of the steam injection ports are formed at an interval equal to the pitch of the spiral blades of the stirring unit. It has a configuration.
  With this configuration, the following actions and effects are provided in addition to the actions and effects of the first or second aspect.
When the steam injection ports are arranged at an interval equal to the pitch of the spiral blades, each space formed between the spiral blades always overlaps and communicates with the position of the spiral blades during rotation of the stirring unit. Therefore, saturated steam and / or superheated steam can be reliably and efficiently supplied to the space from each steam injection port.

Invention of Claim 5 is a metal waste processing apparatus of any one of Claim 1, 3 or 4 , Comprising: The exit of the said gas conduction path of the said metal waste conveyance part is said metal waste supply It has the structure connected with the part.
With this configuration, in addition to the operation and effect of any one of claims 1, 3 and 4 , the following operation and effect are provided.
(1) By connecting the outlet of the gas conduction path of the metal scrap conveying section to the metal scrap supplying section, the decomposition gas generated by the thermal decomposition of the deposits of the metal scrap in the conveying path is generated from the metal scrap supplying section. As well as being able to discharge to the outside reliably, it is possible to preheat the metal scrap supplied from the metal scrap supply section by effectively using the heat of the cracked gas, and shorten the processing time in the metal scrap transport section It is possible and excellent in energy saving.

  Here, it is only necessary that the outlet of the gas conduction path of the metal scrap conveyance unit is connected to the metal scrap supply unit, and the path from the gas conduction path to the metal scrap supply unit can be appropriately selected. Are arranged in parallel with the longitudinal direction of the transport path, and the outlet of the end of the gas conduction path is preferably connected to the metal scrap supply section. This makes it possible to efficiently discharge the cracked gas by minimizing the path from the gas conduction path to the metal scrap supply part, suppresses heat radiation from the cracked gas to the surroundings, and is efficient for preheating in the metal scrap supply part. Can be used. In addition, by arrange | positioning the connection position of the exit of a gas conduction path and a metal waste supply part in the downstream of a metal waste supply part, a cracked gas can be made to contact metal waste reliably and waste heat is utilized effectively. be able to.

The schematic front view which shows the structure of the metal scrap processing apparatus of Embodiment 1. FIG. (A) A-A taken along the line schematic end face cross-sectional view of a main portion sectional schematic front view showing a scrap metal conveying portion of the metal scrap processing device of Embodiment 1 (b) FIGS. 2 (a)

The metal scrap processing apparatus of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below.
(Embodiment 1)
FIG. 1 is a schematic front view showing the configuration of the metal scrap disposal apparatus of the first embodiment.
In FIG. 1, reference numeral 1 denotes cutting oil, grinding oil, or the like adhering to metal scrap generated when processing a metal such as aluminum, zinc, copper, or iron, or an alloy such as brass, aluminum, or stainless steel, or discarding these metal products. The metal waste disposal apparatus in Embodiment 1 used for thermal decomposition of various deposits such as cutting fluid, paint, rust preventive agent, etc., 2 is the metal waste transportation section of the metal waste disposal apparatus 1, and 3 is the metal waste transportation section 2. A cylindrical conveyance path, 3 a is a peripheral wall of the conveyance path 3, 4 is a metal scrap supply unit of the metal scrap processing apparatus 1 connected to the upstream side of the transport path 3, and 5 is connected to the downstream side of the transport path 3. The metal scrap discharge part of the scrap metal processing apparatus 1, 6 is a metal scrap treatment for heating dry saturated steam generated by a boiler or the like to generate superheated steam and supplying the steam and / or superheated steam to the metal scrap transporting section 2. It is a steam supply part of the apparatus 1.

The metal waste supply part 4 should just be what can supply metal waste continuously or intermittently. In the case where the metal scrap supply unit 4 includes a scraper conveyor, a screw conveyor, or the like, a large amount of metal scrap can be processed continuously, the apparatus can be easily automated, and the operability and work efficiency are excellent. Further, the metal scrap supply unit 4 may be provided with a shutter-type weighing damper or the like.
In addition, when a slide gate etc. are provided before and behind the metal waste supply part 4, the airtightness in the conveyance path 3 of the metal waste conveyance part 2 can be raised, oxygen concentration can be controlled, and oxidation of metal waste can be prevented. Can do.
Further, in order to adjust the size of the metal scrap, a pretreatment device of a shear type (uniaxial shear crusher etc.) or an impact type (hammer crusher etc.) for breaking or cutting the metal scrap is provided upstream of the metal scrap supply unit 4. When provided on the side, the size of the metal scrap can be adjusted, and the efficiency of the thermal decomposition can be improved.

Next, the detail of the metal scrap conveyance part of the metal scrap processing apparatus of Embodiment 1 is demonstrated.
Fig.2 (a) is a principal part cross-section schematic front view which shows the metal scrap conveyance part of the metal scrap processing apparatus of Embodiment 1, FIG.2 (b) is a schematic view on the AA line of Fig.2 (a). it is an end cross-sectional view.
In FIG. 2A, 10 is a stirring unit inserted in the conveyance path 3, 11 is a rotating shaft of the stirring unit 10, 12 is a spiral blade of the stirring unit 10 disposed on the outer periphery of the rotating shaft 11, 12a is a space in the conveyance path 3 formed between the spiral blades 12, and 13 is arranged in parallel with the longitudinal direction of the rotary shaft 11 and is connected to the outer peripheral side of the blades 12 at 180 ° intervals. The connected agitation unit, 14 is a plurality of gas discharge ports formed on the upper surface side of the peripheral wall 3a of the conveyance path 3, and 15 is in communication with the plurality of gas discharge ports 14 outside the peripheral wall 3a of the conveyance path 3 in the conveyance path 3 A gas conduction path 15a for discharging the cracked gas generated when the deposits of metal scrap are thermally decomposed from the metal scrap conveying section 2, 15a is formed at the end of the gas conduction path 15 and is connected to the downstream end of the metal scrap supply section 4. The outlet of the gas conduction path 15, 16 is a metal connected to one end of the rotating shaft 11 of the stirring unit 10 A driving motor of the transport unit 2.

The shape and size of the gas discharge port 14 can be selected as appropriate. However, when the gas discharge ports 14 are arranged at an interval equivalent to the pitch of the spiral blades 12, a spiral shape is generated during the rotation of the stirring unit 10. Since each space 12a formed between the blades 12 necessarily overlaps and communicates with the position of the gas discharge port 14, the decomposition gas can be discharged from each gas discharge port 14 reliably and efficiently.
Although the connection stirring part 13 of the stirring part 10 should just be what can fix the outer peripheral side of the helical blade | wing 12, plate-shaped members, such as a flat steel (flat bar), are used suitably. By connecting and reinforcing the adjacent blades on the outer peripheral side of the spiral blade 12 along the longitudinal direction of the rotation shaft by the connection stirring unit 13, rigidity can be ensured and deformation of the blade 12 can be prevented. . Moreover, when the connection stirring part 13 is flat form, a contact area with metal waste can be ensured, metal scrap can be efficiently scraped up and the stirring effect can be heightened. In the present embodiment, the connected agitation units 13 are arranged at two positions with an interval of 180 degrees in the circumferential direction, but the number of the connected agitation units 13 is preferably selected in the range of 2 to 8 locations. . When the number of the connected stirring portions 13 is only one, the blade 12 is likely to be deformed, the rigidity of the stirring portion 10 as a whole is lowered and bending is likely to occur, and the stirring effect tends to be lowered. As the number of parts increases, the number of connected stirring parts 13 that do not contribute to stirring increases, the weight of the stirring part 10 as a whole increases, the energy required for rotation of the stirring part 10 increases, and the stirring efficiency and energy saving performance of the metal scrap are increased. This is because it has been found that there is a tendency to decrease.

In FIG. 2B, 17 is a steam supply pipe disposed on one side of the transport path 3 of the metal scrap transport section 2 and connected to the steam supply section 6 (see FIG. 1), 18 is a steam supply pipe 17 and These are a plurality of vapor injection ports arranged along the longitudinal direction of the communication conveyance path 3.
The shape and arrangement of the steam injection port 18 can be selected as appropriate. However, by providing a plurality of steam injection ports 18 along the longitudinal direction of the transport path 3, saturated steam and Since the superheated steam can be spread and the contact efficiency with the metal scrap can be increased, the supply amount of saturated steam and / or superheated steam can be reduced, and the energy saving property is excellent. Further, it is possible to efficiently supply the steam by lowering the steam pressure per one point of the steam injection port 18, and it is possible to prevent the steam from being supplied excessively and to make a short pass, and the energy saving property is excellent. Furthermore, by lowering the vapor pressure injected from the vapor injection port 18, scattering of fine powders such as aluminum having a risk of dust explosion can be prevented, and the safety is excellent.
In addition, a hole is formed in the peripheral wall 3a of the conveyance path 3 to form a vapor injection port 18, and the protrusion is formed inside the conveyance path 3 by communicating with the steam supply pipe 17 on the outer peripheral surface side of the peripheral wall 3a of the conveyance path 3. And can prevent interference with the blade 12 of the agitating unit 10 and reduce the gap between the outer peripheral surface of the blade 12 and the inner peripheral surface of the transport path 3 to prevent a short path of saturated steam and / or superheated steam. it can. Further, when the steam injection ports 18 are arranged at an interval equivalent to the pitch of the spiral blades 12, each space 12 a formed between the spiral blades 12 is necessarily steam-injected during the rotation of the stirring unit 10. Since it overlaps and communicates with the position of the port 18, saturated steam and / or superheated steam can be reliably and efficiently supplied from each of the steam injection ports 18 to the space 12 a.

Operation | movement of the metal waste processing apparatus of Embodiment 1 comprised as mentioned above is demonstrated.
Saturated steam and / or superheated steam supplied from the steam supply unit 6 in FIG. 1 passes through the steam supply pipe 17 and is injected into the inside of the conveyance path 3 of the metal scrap conveyance unit 2 from each vapor injection port 18.
Moreover, the metal scrap supplied from the metal scrap supply part 4 of FIG. 1 is thrown into the upstream side of the conveyance path 3.
In FIG. 2, the metal scrap is transported downstream (from the right side to the left side in FIG. 2A) along the transport path 3 by rotating the stirring unit 10 with the drive motor 16. While the metal debris passes through the transport path 3, the moisture adhering to the metal debris evaporates due to the saturated steam of 100 ° C. to 200 ° C. and / or the overheated steam of 150 ° C. to 600 ° C. ejected from the steam injection port 18. Deposits such as cutting fluid, paint, and rust preventive are thermally decomposed and removed.
The metal scrap from which the deposits have been removed is discharged from the metal scrap discharge section 5 on the downstream side of the transport path 3, and is collected and reused as a metal resource.

In FIG. 2, a blower (not shown) is connected to the metal scrap supply unit 4, and the decomposition gas and vapor generated inside the conveyance path 3 due to thermal decomposition of the deposits are sucked and gas is discharged from the gas discharge port 14. It passes through the conduction path 15 and is discharged out of the system via the metal scrap supply unit 4. At this time, by effectively utilizing the heat of the cracked gas, the metal scrap supplied from the metal scrap supply unit 4 can be preheated, and the processing time in the metal scrap transport unit 2 can be shortened. The discharged cracked gas is cooled by a heat exchanger and collected by a wet scrubber to prevent explosion of unburned gas and dust explosion caused by fine powder such as aluminum discharged along with cracked gas. it can. At this time, the oil and water obtained by cooling the cracked gas can be emulsified and reused as fuel. In addition, you may carry out a combustion process for the objective of the safe process of the decomposition gas generated by the thermal decomposition of a deposit | attachment, a deodorizing, etc., and you may utilize the waste heat for the preliminary heating of a metal scrap.
As the metal scrap moves from the upstream side to the downstream side of the conveyance path 3, the deposits are heated and decomposed to generate decomposition gas. The gas discharge port 14 may be provided, but by providing a plurality of gas discharge ports 14 over almost the entire length of the transfer path 3 as in the present embodiment, the cracked gas generated inside the transfer path 3 is transferred. It can be efficiently discharged from the entire path 3.
Further, in the present embodiment, by connecting the outlet 15a of the gas conduction path 15 to the metal waste supply unit 4, the metal waste is preheated using the heat of the cracked gas. It is not necessary to connect the outlet 15a of the gas to the metal scrap supply unit 4, and the cracked gas discharged from the gas conduction path 15 may be directly cooled by a heat exchanger or used for heating a superheated steam generator or the like. May be.

According to the metal scrap processing apparatus in Embodiment 1, it has the following effects.
(1) Scrap supply and / or superheated metal scrap supply section connected to the upstream side of the metal scrap transport section, metal scrap discharge section connected to the downstream side of the metal scrap transport section, and metal scrap transport section By having the steam supply part that supplies steam, the metal scrap supplied from the metal scrap supply part is transported by the metal scrap transport part and discharged from the metal scrap discharge part. Various deposits such as oil, paint, and rust preventive agent can be removed by thermal decomposition in a short time with saturated steam and / or superheated steam supplied from the steam supply unit, which is excellent in energy saving.
(2) Since the metal scrap conveyance unit has a cylindrical conveyance path and an agitation unit inserted in the conveyance path, saturated vapor supplied from the steam supply unit while conveying the metal scrap in the agitation unit and It is possible to reliably contact the superheated steam and the metal scrap, and to efficiently decompose the deposit attached to the surface of the metal scrap, thereby improving the efficiency and certainty of removing the deposit.
(3) One or more gas exhaust ports formed on the upper surface side of the peripheral wall of the transport path are connected to the gas exhaust port on the outer side of the peripheral wall of the transport path, and the metal scrap deposit is thermally decomposed. By having a gas conduction path that discharges the cracked gas generated from the metal scrap conveying part, the cracked gas generated by the thermal decomposition of the deposit of metal scrap is reliably and efficiently discharged from each gas discharge port, It can be smoothly moved along the gas conduction path and discharged out of the system from the metal scrap conveying section, and the decomposition gas discharge is excellent.
(4) The stirrer is inserted into the cylindrical conveyance path, so that there is less wasted space than a rotary kiln, etc., the device can be made compact, it is excellent in space saving, and there is little heat loss. Excellent heating efficiency.
(5) It is possible to remove metal waste deposits by thermal decomposition only with saturated steam and / or superheated steam without using a drying treatment material, etc. Is not attached, and there is no need for a mechanism or process for separating the dry processing material, etc., and it is possible to obtain metal scrap without deposits and to prevent deterioration due to oxidation. Excellent recyclability.
(6) Since it is possible to control the residence time of the metal scraps in the transport path only by controlling the number of revolutions of the stirring unit, according to the size, shape, bulk specific gravity or the kind of deposits of the metal scraps, By setting the necessary residence time, the deposits of metal scrap can be surely thermally decomposed, and the operability, versatility, and processing efficiency are excellent.
(7) The stirrer has a spiral blade disposed on the outer periphery of the rotating shaft and a connecting stirring unit disposed in parallel with the longitudinal direction of the rotating shaft to reinforce the outer peripheral side of the blade. It is possible to stir by scraping metal scraps at the connecting stirrer on the outer peripheral side of the blades close to the road, and the metal scraps and saturated steam and / or superheated steam are brought into contact with each other and adhered to the surface of the metal scraps. The deposit can be transported while being efficiently decomposed by heat, and is excellent in energy saving and deposit removal efficiency.
(8) Since the stirring unit has spiral blades, metal scraps in the conveyance path can be controlled simply by controlling the number of revolutions of the motor that rotates the stirring unit for metal scraps of various shapes and bulk specific gravity. It is possible to accurately heat and decompose the deposit by accurately controlling the residence time of the resin, and it is excellent in the reliability and stability of the heat decomposition treatment.
(9) Since the stirring unit has a spiral blade disposed on the outer periphery of the rotating shaft and a connecting stirring unit that is disposed in parallel with the longitudinal direction of the rotating shaft and reinforces the outer peripheral side of the blade, the screw It can maintain the same rigidity and transport efficiency as the feeder and the quantitativeness of the transport of metal scraps, and is excellent in the efficiency of thermal decomposition of deposits.
(10) Since the stirrer has a connecting stirrer that is arranged in parallel with the longitudinal direction of the rotating shaft and that reinforces the outer peripheral side of the blade, the strength of the stirrer can be improved. By reducing the thickness of the agitator, the friction between the outer peripheral portion of the blade and the inner surface of the conveyance path can be reduced, and the durability and long life of the metal scrap conveyance unit are excellent.
(11) The stirrer has a connecting stirrer that is arranged in parallel with the longitudinal direction of the rotating shaft and connects and reinforces the outer peripheral side of the blades, whereby the rigidity of the stirrer can be maintained, such as briquettes and die cast burrs, etc. It is possible to effectively prevent the occurrence of deformation and breakage of blades, and to reliably transport metal scrap, even if it is a lump of metal scrap or metal scrap of various shapes and specific gravity. Excellent reliability and reliability.
(12) Since the spiral blades of the stirring unit are arranged on the outer periphery of the rotating shaft, the stirring unit can be reliably rotated by ensuring sufficient rigidity and preventing bending and deformation. Excellent stability.
(13) When a plurality of gas discharge ports of the metal scrap conveying unit are arranged at intervals equivalent to the pitch of the spiral blades, each of the gas discharge ports formed between the spiral blades during the rotation of the stirring unit The space and the gas discharge port are reliably communicated, and the cracked gas generated by the thermal decomposition of the deposits of the metal scrap can be discharged reliably and efficiently, and the discharge gas is reliably and efficiently discharged.
(14) Since the metal scrap transport unit has a steam injection port connected to the steam supply unit and formed on the peripheral wall of the transport path of the metal scrap transport unit, the saturated steam and It is possible to efficiently decompose the deposits of metal scraps by injecting superheated steam, and the heat decomposition efficiency and stability are excellent.
(15) By connecting the outlet of the gas conduction path of the metal scrap conveying section to the metal scrap supplying section, the decomposition gas generated by the thermal decomposition of the metal scrap deposits in the transport path is generated from the metal scrap supplying section. As well as being able to discharge to the outside reliably, it is possible to preheat the metal scrap supplied from the metal scrap supply section by effectively using the heat of the cracked gas, and shorten the processing time in the metal scrap transport section It is possible and excellent in energy saving.

  The present invention can remove various deposits such as cutting fluids, paints, and rust preventives adhering to metal scraps by heat and decomposition in a short time and with high yield, high processing capacity, and resource saving. Contribute to environmental protection and resource saving by promoting the effective use of metal scraps by providing compact, safe, easy-to-use, and space-saving metal scrap disposal equipment. Can do.

DESCRIPTION OF SYMBOLS 1 Metal waste processing apparatus 2 Metal waste conveyance part 3 Conveyance path 3a Perimeter wall 4 Metal waste supply part 5 Metal waste discharge part 6 Steam supply part 10 Stirring part 11 Rotating shaft 12 Blade 12a Space 13 Connection stirring part 14 Gas discharge port 15 Gas guide Passage 15a Outlet 16 Drive motor 17 Steam supply pipe 18 Steam injection port

Claims (5)

A metal scrap disposal device that thermally decomposes deposits of metal scrap with saturated steam and / or superheated steam,
A metal scrap conveying section, a metal scrap supplying section connected to the upstream side of the metal scrap transport section, a metal scrap discharging section connected to the downstream side of the metal scrap transport section, and the metal scrap transport section. A steam supply pipe disposed on one side of the transport path and connected to the steam supply section for supplying the saturated steam and / or the superheated steam, and a hole is formed in the side wall of the transport path in communication with the steam supply pipe. A plurality of vapor injection ports formed on the upper surface side of the peripheral wall of the conveyance path, the metal scrap conveyance unit, the cylindrical conveyance path, the stirring unit inserted in the conveyance path One or more formed gas discharge ports and the gas discharge port communicated with the gas discharge port outside the peripheral wall of the transfer path, and the decomposition gas generated by the thermal decomposition of the deposits of the metal scrap is discharged from the metal scrap transfer unit. A metal waste disposal apparatus comprising a gas conduction path. The stirring unit includes a spiral blade disposed on the outer periphery of the rotating shaft, and a connecting stirring unit that is disposed in parallel with the longitudinal direction of the rotating shaft and connects and reinforces the outer peripheral side of the blade. The metal scrap processing apparatus according to claim 1, wherein: The metal waste processing apparatus according to claim 1 , wherein a plurality of the gas discharge ports of the metal waste transport unit are arranged at intervals equivalent to a pitch of the spiral blades. 3. The metal scrap processing apparatus according to claim 1, wherein a plurality of the steam injection ports are formed at an interval equivalent to a pitch of the spiral blades of the stirring unit. 5. The metal scrap processing apparatus according to claim 1, wherein an outlet of the gas conduction path of the metal scrap transport unit is connected to the metal scrap supply unit.

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