JP2000087055A - Method and apparatus for producing solid fuel from waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for producing a solid fuel from a waste whereby a solid fuel scarcely contg. chlorine can be produced and the amt. of a waste combusted can be minimized. SOLUTION: This method comprises a thermal decomposition step wherein a chlorine component can be eliminated from a waste (a) and the waste (a) is thermally decomposed at a temp. at which a metal-chlorine compd. is not evaporated; an oil/water separation step wherein a thermal decomposition gas generated in the former step and contg. a chlorine component is cooled with water and then subjected to oil/water separation to recover an oil component and acidic water; a cooling and cracking step wherein a thermal decomposition residue occurring in the thermal decomposition step is cooled and cracked; a dissolution step wherein the thermal decomposition residue cooled and cracked in the former step is put into a water vessel 15 to dissolve a metal-chlorine compd. occurring during thermal decomposition in water to separate it from a solid component; and a solid fuel production step wherein the solid component is taken out of the water vessel 15, then is freed of a metal, and is used as a solid fuel (c).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste pyrolysis method and equipment capable of producing solid fuel (refuse-derived fuel) and oil by pyrolyzing waste.

[0002]

2. Description of the Related Art Various methods and equipment for producing solid fuels and the like from wastes have been proposed in the past, and one example of such a method is described in JP-A-8-85797. There is a solid fuel production method. This method for producing solidified fuel will be briefly described with reference to FIG. 5. First, collected municipal solid waste is crushed by a primary crusher to a suitable degree for sorting metals (step 100,
101), iron is separated from the crushed municipal waste by a magnetic separator and removed (steps 102 and 103). From the municipal waste from which iron has been removed, aluminum is sorted by an aluminum sorter and removed (steps 104 and 105).

The municipal waste from which metals have been removed is finely crushed by a secondary crusher to a size of about 20 mm, which is convenient for forming and solidifying the municipal waste (step 106). The refuse that could not be crushed by the secondary crusher is returned to the primary crusher again, and Step 101
After re-performing steps 105 to 105, crushing is performed.

[0004] The municipal solid waste finely divided by the secondary crusher is heated and dried in a heating / drying oven (step 107), and the heated and dried municipal solid waste is sorted by size using a vibrating screen (step 108). . At this time, large municipal waste that does not pass through the vibrating screen is again crushed by the secondary crusher, and small refuse that passes through the vibrating screen is sorted by the specific gravity sorter. Then, steps 102 to 105
Particles having a large specific gravity, such as iron, glass, and stone, which have not been sorted and removed in the step (a), are sorted and removed (steps 109 and 11).
0). The particles passing through the vibrating screen and having a low specific gravity are mixed and agitated with slaked lime (Ca (OH) ₂ ) by a mixer (step 111), and a mixture of slaked lime and the mixed and stirred municipal waste is formed by a molding machine. (Step 112), a solid waste fuel is obtained (Step 113).

[0005]

As described above, the solid waste fuel production method described above is a method for producing solid waste fuel by adding slaked lime to waste from which incombustible substances have been removed.
It still had the following problems to be solved. That is, the amount of incineration increases due to the addition of slaked lime, and as a result, the amount of incineration residues increases, and the amount of landfill disposal also increases.
Calcium chloride (C) generated by the reaction between garbage and slaked lime
aCl ₂ ) is landfilled in a state where it is contained in the incineration residue, and there is a problem that the environmental load of chlorine remains.

[0006] Since it is necessary for Cl to sufficiently react with Ca during combustion, it is necessary to appropriately control the amount of slaked lime, and the operation of the refuse-solidified fuel production facility becomes complicated. If the amount of slaked lime is insufficient or unevenly distributed, hydrochloric acid (HCl) or dioxin may be generated, and there is a risk that generation of harmful substances may not be suppressed. Calcium chloride is partially fly ash and scatters on the gas side, so that clinker is generated and shortens the life of the solid fuel combustion furnace. In addition, when a waste heat boiler is provided in the solid fuel combustion furnace, the metal chloride causes corrosion of the boiler water pipe, thereby shortening the life of the boiler and lowering the boiler efficiency. The present invention has been made in view of such circumstances, and it is possible to prevent chlorine, which is a source of various harmful substances, from being contained in solid fuel and other products generated from waste as much as possible. It is an object of the present invention to provide a method and equipment for producing solid fuel from waste, which can reduce the amount of waste incinerated and landfilled.

[0007]

According to the first aspect of the present invention, there is provided a method for producing a solid fuel from waste, comprising a pyrolysis step, an oil / water separation step, a cooling / crushing step, and a dissolving step. And a solid fuel production process. Then, in the pyrolysis step, the waste is converted to a reaction temperature of 330 ° C., which is a reaction temperature capable of removing chlorine components and not causing volatilization of metal chlorine compounds.
Thermally decomposes at ~ 580 ° C. In the oil-water separation process, after the pyrolysis gas containing the chlorine component generated in the pyrolysis process is cooled with water, oil-water separation is performed, and acidic water containing oil and hydrochloric acid is collected. The pyrolysis residue generated in the process is cooled and crushed. In the melting step, the pyrolysis residue cooled and crushed in the cooling and crushing step is charged into a water tank, and a metal chlorine compound (Fe
Cl ₂ , CaCl _2, etc.) are dissolved in water and separated from solids. In the dissolving step, the solid content is taken out of the water tank, the metal is removed from the solid content using a metal removing device such as a mesh conveyor or a vibrating sieve, and the solid content after the removal is used as a solid fuel.

[0008] In the above method for producing a solid fuel, the reaction temperature in the pyrolysis step is from 330 ° C to 580 ° C.
By setting to, the thermal decomposition conditions can be optimized, and dechlorination can be performed efficiently without volatilization of the metal chlorine compound. In particular, the chlorine in the organic chlorine compound as waste can be removed together with the pyrolysis gas as almost all gas. On the other hand, when the reaction temperature is lower than 330 ° C., the decomposition rate of plastics is extremely slow, the size of the thermal decomposition apparatus is increased, and the residual chlorine is increased.
If the temperature exceeds 80 ° C, the melting point of some of the metal chlorine compounds generated by thermal decomposition will exceed the melting point of these substances, and these substances will evaporate, causing pipe clogging or corrosion of equipment placed downstream. become. The reaction temperature was 33
The reaction time when set at 0 ° C. to 580 ° C. is 8 minutes to 42 minutes, as is apparent from the correlation diagram shown in FIG.
In addition, room temperature water is sprayed onto the pyrolysis gas containing chlorine components generated in the pyrolysis process to cool it, and the condensate is separated into oil and water to recover oil and acid water. Can be obtained, and wax and gasoline containing no chlorine can be produced by fractionating the oil component.
The acidic water can be rendered harmless by converting it into a neutralized salt with a neutralizing agent.

The method for producing a solid fuel from the above-mentioned waste can also be carried out as follows. The pyrolysis of the waste in the pyrolysis step is performed by heating the waste while transporting and stirring the waste with a plurality of transfer screws arranged in parallel. In this way, by using a plurality of transfer screws arranged in parallel, heat can be uniformly transmitted to the waste, thermal decomposition can be performed efficiently, and the transfer screws clean the transfer surfaces mutually. In addition, it is possible to prevent the transfer screw from lowering the transfer capacity due to the adhesion of the molten plastic or the like, and to smoothly transfer the waste.

In a plurality of transfer screws arranged in parallel, the inclination angle of the screw blade with respect to the vertical line is 10
° to 30 °. By setting the angle in this range, the screw blades are compatible with the waste, and the transfer of the waste by the plurality of transfer screws arranged in parallel can be facilitated. On the other hand, when the inclination angle is less than 10 °, the frictional force between the screw shaft and the waste becomes larger than the transporting force due to the friction between the screw blade and the waste, and the transport efficiency is reduced.
When the angle exceeds 0 °, the component perpendicular to the axis of the frictional force of the screw blade becomes large, and the transport efficiency decreases.

In the oil-water separation step, the spray droplet diameter of the spray water (spray) used for cooling the pyrolysis gas is 100 to 400 μm. By setting the droplet diameter within this range, efficient contact between the spray water and the pyrolysis gas can be achieved using a simple structure and cooling can be performed. Further, by setting the temperature of the spray water to normal temperature, oil-water separation can be performed safely without danger such as fire.

In the cooling / crushing step, the cooling / crushing of the thermal decomposition residue is performed by a plurality of transfer screws arranged in parallel. In this way, by using a plurality of transfer screws arranged in parallel, the transfer screws clean the transfer surface of each other, preventing the transfer capability of the transfer screw from being reduced due to the adhesion of the thermal decomposition residue, and smoothly performing the thermal decomposition. Residue can be transported.

[0013] The water temperature in the water tank in the dissolving step is 30
Set to 70-70 ° C. Thereby, the metal chlorine compound is efficiently dissolved in water, and the running cost can be reduced. On the other hand, when the temperature is lower than 30 ° C., the solubility is low and the efficiency is lowered (for example, the solubility of calcium chloride is 2
42.7 at 0 ° C, 50 at 30 ° C, about 17%
To rise. ), If it exceeds 70 ° C., evaporation of water increases, and the amount of makeup water increases. In addition, since the dissolving treatment is performed with water at normal temperature, there is no danger of fire or the like, so that it is safe.

Further, in the facility for producing a solid fuel from waste according to the second aspect of the present invention, the supplied waste is heated while being transported and stirred by using a plurality of transfer screws arranged in parallel. Water is injected into the pyrolysis device containing chlorine gas generated by the pyrolysis device and cooled by injecting water into the pyrolysis device, and condensed at normal temperature consisting of oil and acid water, combustible gas, and solid matter. A pyrolysis gas cooling device that generates air, an oil-water separator that receives room temperature condensate, combustible gas, and solids from the pyrolysis gas cooler, and separates the room temperature condensate into pyrolysis oil and acidic water; Receiving the pyrolysis residue from the apparatus, cooling and crushing the pyrolysis residue using a plurality of transfer screws arranged in parallel, and receiving the cooled and crushed pyrolysis residue from the cooling and crushing apparatus, Dissolves metal chlorine compounds in water A water tank for precipitating solids in the bottom with is, disposed in the water tank comprises a solid take-out apparatus for taking out the solids to the outside, and a metal removing device for removing metals from solid taken out to the outside.

In the above configuration, the plurality of parallel transfer screws constituting the pyrolysis apparatus have a thermal stress relief structure, and the reaction force of the gas cooling stack due to the thermal expansion and contraction of the plurality of parallel transfer screws. Prevent outbreak,
The generation and destruction of distortion of the device can be prevented. That is, by installing a cloth chute below the pyrolysis gas inlet and connecting the upper and lower parts of the gas cooling stack, the upper part of the stack moves freely according to the expansion and contraction of a plurality of transfer screws arranged in parallel. No force is generated, and the cloth chute is installed in a portion after the gas is cooled, so that there is no restriction on materials such as heat-resistant materials.

The plurality of transfer screws arranged in parallel in the cooling and crushing device also have a thermal stress relief structure, and the thermal expansion and contraction of the plurality of transfer screws in the thermal decomposition device and the cooling device are combined with the cooling device. It is possible to prevent a reaction force from being generated at the connection portion of the crushing device, thereby preventing the cooling crushing device from generating or breaking. That is, by installing rollers and guide rails below the cooling and crushing device, the cooling and crushing device freely moves in the front-rear direction in accordance with the thermal expansion and contraction of the thermal decomposition device, so that no reaction force is generated.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. First, an overall configuration of a facility 10 for producing solid fuel from waste according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, a facility 10 for producing solid fuel from wastes is generated by a pyrolysis apparatus 11 for pyrolyzing supplied waste a such as municipal solid waste and a pyrolysis apparatus 11. Water is injected into the pyrolysis gas containing chlorine to cool it, and a pyrolysis gas cooling device that generates room temperature condensate composed of pyrolysis oil and acidic water containing hydrochloric acid, non-condensable combustible gas, and solids An oil-water separator 13 that receives the room temperature condensate, combustible gas, and solids from the pyrolysis gas cooling device 12, separates the room temperature condensate into pyrolysis oil and hydrochloric acid, and is transferred from the pyrolysis device 11. Cooling and crushing device 14 for cooling and crushing the pyrolysis residue, and cooling and crushing from the cooling and crushing device 14.
A water tank 15 for receiving the crushed pyrolysis residue, dissolving the metal chlorine compound in water, and precipitating solids at the bottom.
And a solids removing device 16 for removing solids from the water tank 15 to the outside, and a metal removing device 17 for removing metal from the solids removed to the outside.

Next, the configuration of each part of the facility 10 for producing solid fuel from waste having the above-described configuration will be described with reference to FIG.
This will be specifically described with reference to FIGS. As shown in FIG. 1, on the upstream side of a facility 10 for manufacturing solid fuel from waste, supplied waste a such as municipal solid waste is transported and stirred using a plurality of transfer screws arranged in parallel. A thermal decomposition device 11 that heats and thermally decomposes is provided. As shown in FIGS. 1 to 3, a long casing 18 having a horizontally long circular cross section has two transfer screw shafts 19, 20.
Are mounted in parallel. One end of each of these transfer screw shafts 19 and 20 is connected to a rotation motor 21 by a reduction mechanism 22.
Are interlocked and linked. Transfer screw shaft 19,
Transfer blades 23 and 24 are spirally attached to 20, respectively, and as shown in FIGS. 2 and 3, some of them are in a superposed state.

A waste inlet 25 is provided on the upper surface on the upstream side of the casing 18, and a pyrolysis gas outlet 26 and a pyrolysis residue outlet 27 are provided on the upper and lower surfaces on the downstream side, respectively. Have been. Furthermore, casing 1
A heat medium jacket 28, which is filled with a heat medium so as to cover the entire casing 18, is attached to the outer peripheral surface of the casing 8. By adjusting the temperature of the heat medium to be filled, the heating temperature of the waste a is increased. Is the reaction temperature at which the chlorine component can be removed and the volatilization of the metal chlorine compound does not occur.
It can be adjusted to a temperature between 0 ° C and 580 ° C. With the above-described configuration, by filling the waste a into the casing 18 through the waste input port 25 and driving the rotary motor 21, the chlorine component can be removed and the metal chlorine compound is not volatilized, and the heat is generated at the reaction temperature. It can be decomposed and can generate a pyrolysis gas containing chlorine gas and a pyrolysis residue. The pyrolysis gas is supplied to the pyrolysis gas cooling device 12 through the pyrolysis gas supply line 29, and the pyrolysis residue is supplied to the cooling and crushing device 14 through the pyrolysis residue supply line 30. It should be noted that other heating means such as an electric heater can be used instead of the heat medium.

As shown in FIGS. 1 to 3, the thermal decomposition gas cooling device 12 is disposed downstream of the thermal decomposition device 11.
A spray nozzle 32 for spraying the cooling water downward is attached to the top of the cooling tower 31 composed of a vertically long cylinder,
A thermal decomposition gas inflow port 33 is provided on the peripheral wall of the cooling tower 31 immediately below the cooling tower 31. And the pyrolysis gas inlet 33
Is connected to the pyrolysis gas outlet 26 via a pyrolysis gas supply line 29. With the above configuration,
By the spray nozzle 32, water can be effectively cooled by spraying water on the pyrolysis gas containing chlorine gas supplied from the pyrolysis apparatus 11, and by this cooling, the room temperature condensation consisting of oil and acidic water can be achieved. Minutes, flammable gases and solids can be produced.

As shown in FIG. 1, a pyrolysis gas cooling device 1
An oil / water separation device 13 having a tank structure is disposed below the tank 2. The oil-water separator 13 is provided at its top with an opening 34 which is connected to the lower end opening of the cooling tower 31 and is connected thereto.
An acid water outlet 35 is provided at the lower end, and an oil outlet 36 is provided on the peripheral wall. A solid material outlet 37 is provided at the bottom of the oil-water separator 13, and a combustible gas outlet 37a is provided at the top of the peripheral wall. With the above-described configuration, the normal-temperature condensate is separated into oil and acidic water by utilizing the specific gravity difference, and the oil is taken out from the oil outlet 36 and fractionated using a known means to obtain wax or gasoline. It can be refined and used in existing heating furnaces, boilers, combustion furnaces and the like. In addition, the combustible gas outlet 37
The non-condensable combustible gas is taken out from a and can be used as a gaseous fuel by an existing heating furnace, boiler, combustion furnace or the like. Further, after the acidic water is taken out from the acidic water outlet 35, the acidic water transfer line 39 is supplied to the neutralization tank 38.
Can be transported through. In addition, the solid material outlet 3
7, the solid can be taken out.

As shown in FIG. 1, on the downstream side of the pyrolysis device 11, a cooling and crushing device 14 is disposed together with the above-described pyrolysis gas cooling device 12. As shown in FIG. 1, two transfer screw shafts 41 and 42 forming a plurality of transfer screws arranged in parallel are attached in parallel to a long casing 40 having a horizontally long circular cross section. One end of each of the screw shafts 41 and 42 is
Are interlocked with each other via a speed reduction mechanism 44. The transfer screw shafts 41 and 42 have transfer blades 45 and 4 respectively.
6 are spirally mounted, and some of them are in a superposed state. In addition, a pyrolysis residue inlet 47 is provided on the upper surface on the upstream side of the casing 40, and a pyrolysis residue outlet 48 is provided on the lower surface on the downstream side. Further, on the outer peripheral surface of the casing 40, a water-cooling jacket 4 filled with cooling water so as to cover the entire casing 40 is provided.
9 is attached, and by adjusting the temperature of the cooling water b to be filled, the pyrolysis residue can be crushed while being effectively cooled.

As shown in FIG. 1, a water tank 15 is provided on the downstream side of the cooling and crushing device 14, and a solids extracting device 16 for extracting solids to the outside is provided in the water tank 15. Have been. That is, the bottom plate of the water tank 15 is
Horizontal bottom plate 5 located immediately below the pyrolysis residue outlet 48 of FIG.
0 and an inclined bottom plate 52 having one end connected to a corresponding end of the horizontal bottom plate 50 and the other end extending upward beyond the water surface 51. Further, the solid content extracting device 16 is mounted on the inclined bottom plate 52. The solids removing device 16 includes a screw shaft 55 that is rotatably disposed and includes a spiral transfer blade 54,
5 and a rotary motor 56 which is interlocked and connected to the motor 5. Further, an overflow portion 57 is provided at an upper portion of the water tank 15 at a position substantially at the same height as the water surface 51, and the overflow portion 57 is provided with an acidic water inlet provided at the top of the oil-water separator 13 through an overflow pipe 58. 59.

With the above configuration, the cooling and crushing device 14
Thus, the pyrolysis residue cooled and crushed is received in the water tank 15, the metal chloride can be dissolved in water, and the solid content can be precipitated at the bottom. The rotation motor 5
6, the horizontal bottom plate 50 and the inclined bottom plate 5 are driven.
The solids deposited in the lower part of 2 can be taken out of the water tank 15, and the water in which the metal chloride is dissolved, that is, the acidic water, can be supplied to the oil-water separator 13 through the overflow pipe 58.

As shown in FIG. 1, a metal removing device 17 is provided downstream of the solids removing device 16. In the present embodiment, the metal removing device 17 is a mesh conveyor 60.
It is possible to sort metal crushed pieces with large particle size etc. on the sieve, and collect solids to be sieved as solid fuel c for use by existing heating furnaces, boilers, combustion furnaces, etc. can do.

Another configuration of the facility 10 for producing solid fuel from waste shown in FIG. 1 will be described.
8, a stirring blade 62 rotated by a rotation motor 61;
Is installed. A caustic soda supply port 63 is provided at the top of the neutralization tank 38, a neutralized salt outlet 64 is provided at the bottom thereof, and an acidic water inlet 65 and a neutralized water reflux outlet 66 are provided on the peripheral wall thereof. Is provided. And
The neutralized water reflux outlet 66 is connected to the upper part of the water tank 15 through a neutralized water reflux line 67. A tap water supply line 68 is connected to an upper portion of the neutralization tank 38 through a ball tap 69. In addition, 70 is a pH sensor.

Next, a method for producing a solid fuel c from a waste a using the facility 10 for producing a solid fuel from a waste having the above-described configuration will be described with reference to FIG. First, waste a composed of municipal waste or the like is supplied into the pyrolysis apparatus 11 through the waste input port 25, and the waste a
Is thermally decomposed at a reaction temperature of 330 ° C. to 580 ° C., which is a reaction temperature at which the chlorine component can be removed and the metal chlorine compound does not volatilize (pyrolysis step). In this pyrolysis step, pyrolysis of the waste a generates a pyrolysis gas containing a chlorine component (chlorine gas).
The gas is supplied to the pyrolysis gas cooling device 12 through the pyrolysis gas supply line 29. At the same time, the pyrolysis residue from which the chlorine component is removed but the metal chlorine compound is mixed without being volatilized is taken out from the pyrolysis device 11 and supplied to the cooling and crushing device 14. Then, in the cooling and crushing device 14, the pyrolysis residue is cooled and, as described later, the pyrolysis residue is crushed to a particle size that can be sieved by the mesh conveyor 60 (cooling / crushing step). .

The pyrolysis residue cooled and crushed by the cooling and crushing device 14 is taken out of the cooling and crushing device 14 and taken out of the water tank 1.
5, and the metal chlorine compound generated during thermal decomposition is dissolved in water and separated from the solid content (dissolution step). Aquarium 1
5, the solids are taken out by a solids take-out device 16 and passed through a mesh conveyor 60 to remove the metal.
The solid fuel c is produced by removing the metal from the solid content in (solid fuel production step). On the other hand, normal temperature water of 30 ° C. to 70 ° C. is sprayed onto the pyrolysis gas containing a chlorine component generated in the pyrolysis process by the pyrolysis apparatus 11 by the spray nozzle 32 to cool the pyrolysis gas at room temperature. .
After the normal temperature condensate flows down into the oil / water separator 13, it is separated into oil and acidic water (including hydrochloric acid) by a difference in specific gravity (oil / water separation step). The oil can be fractionated into wax, gasoline, or the like by known means and used as a liquid fuel, and the acidic water can be transferred to the acidic water transfer line 39.
And neutralized by adding caustic soda, and taken out of the neutralized salt outlet 64 as neutralized salt for processing.

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described.

[0031]

In the method for producing a solid fuel from waste according to the first to third aspects of the present invention, the waste is removed at a reaction temperature of 330 ° C. to 580 which is a reaction temperature at which a chlorine component can be removed and a metal chlorine compound does not volatilize. Since the thermal decomposition is performed at a temperature of ° C., most of the chlorine components contained in the organic chlorine compounds in the waste can be removed together with the pyrolysis gas. Also,
After cooling and crushing the pyrolysis residue, put it in a water tank and dissolve the metal chlorine compound generated during pyrolysis in water,
Since the solid fuel is manufactured by separating and sieving the solid content, a solid fuel containing almost no metal chlorine compound can be manufactured. Therefore, when such a solid fuel is used as an auxiliary fuel or the like, unlike conventional cases, it is not necessary to add slaked lime or the like, so that the amount of incineration and the amount of incineration residue can be significantly reduced, and also the amount of landfill disposal can be significantly reduced. Further, generation of harmful substances such as dioxin can be suppressed as much as possible. Furthermore, since slaked lime is not used in the manufacture of solid fuel, the solid fuel does not contain calcium chloride. Therefore, it is possible to prevent the occurrence of clinker generated when the solid fuel containing calcium chloride is burned in the incinerator, and to prolong the life of the incinerator. Further, since the metal chlorine compound can be removed, corrosion of a boiler water pipe such as a waste heat boiler can be prevented, and in this respect, the life of the incinerator can be prolonged and the boiler efficiency can be increased.

In addition, the room temperature water is sprayed on the pyrolysis gas containing a chlorine component generated in the pyrolysis step to cool the system, and the condensate is separated into oil and water to recover the oil and acid water. , A wax and gasoline containing no chlorine can be produced by fractionating the oil. The acidic water can be rendered harmless by converting it into a neutralized salt with a neutralizing agent.

In the method for producing solid fuel from waste according to the second aspect, the pyrolysis of the waste in the pyrolysis step is heated while transporting and stirring the waste by a plurality of transfer screws arranged in parallel. The heat is uniformly transmitted to the waste, and the thermal decomposition can be performed efficiently. Further, since the transfer screws mutually clean the transfer surfaces, it is possible to prevent the transfer capability of the transfer screws from being reduced due to adhesion of the molten plastic or the like, and to smoothly transfer the waste.

In the method for producing a solid fuel from waste according to the third aspect, the cooling and crushing of the pyrolysis residue in the cooling and crushing step is performed by a plurality of transfer screws arranged in parallel. Since the screws mutually clean the transfer surfaces, the transfer screw can be prevented from lowering the transfer capability due to the adhesion of the pyrolysis residue, and the pyrolysis residue can be transferred smoothly. In a facility for producing solid fuel from waste according to claim 4, a pyrolysis device, a pyrolysis gas cooling device, an oil / water separation device, a cooling and crushing device, a water tank, a solids extraction device, With a device having a compact configuration including a removing device, a solid fuel and an oil component containing almost no chlorine can be efficiently produced by inexpensive equipment.

[Brief description of the drawings]

FIG. 1 is a conceptual configuration explanatory view showing the overall configuration of a facility for producing solid fuel from waste according to an embodiment of the present invention.

FIG. 2 is a plan view of a plurality of transfer screws arranged in parallel for use in constructing a pyrolysis apparatus of a facility for producing solid fuel from shaped steel waste according to an embodiment of the present invention.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a graph showing a correlation between a reaction temperature and a reaction time in a pyrolysis step of a method for producing a solid fuel from a waste of shaped steel according to one embodiment of the present invention.

FIG. 5 is a process explanatory view of a conventional method for producing a solid fuel from waste.

[Explanation of symbols]

Reference Signs List a waste b cooling water c solid fuel 10 equipment for producing solid fuel from waste 11 pyrolysis device 12 pyrolysis gas cooling device 13 oil-water separation device 14 cooling and crushing device 15 water tank 16 solids extraction device 17 metal removal device 18 Casing 19 Transfer screw shaft 20 Transfer screw shaft 21 Rotary motor 22 Reduction mechanism 23 Transfer blade 24 Transfer blade 25 Waste inlet 26 Pyrolysis gas outlet 27 Pyrolysis residue outlet 28 Heat medium jacket 29 Pyrolysis gas supply line 30 Heat Decomposition residue supply line 31 Cooling tower 32 Spray nozzle 33 Pyrolysis gas inlet 34 Opening 35 Acid water outlet 36 Oil fraction outlet 37 Solids outlet 37a Combustible gas outlet 38 Neutralization tank 39 Acid water transfer line 40 Casing 41 Transfer screw shaft 42 Transfer screw shaft 43 Rotation mode 44 Speed reducer 45 Transfer blade 46 Transfer blade 47 Pyrolysis residue inlet 48 Pyrolysis residue outlet 49 Water cooling jacket 50 Horizontal bottom plate 51 Water surface 52 Inclined bottom plate 54 Transfer blade 55 Screw shaft 56 Rotary motor 57 Overflow section 58 Overflow pipe 59 Acidic water flow Inlet 60 Mesh conveyor 61 Rotary motor 62 Stirrer blade 63 Caustic soda supply port 64 Neutralized salt outlet 65 Acidic water inlet 66 Neutralized water reflux outlet 67 Neutralized water reflux line 68 Water supply line 69 Ball tap 70 pH sensor

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Atsushi Kobayashi F-term in the Engineering Business Division, Nippon Steel Corporation 4H015 AA01 AB01 BA06 BA08 BA12 BB01 BB02 BB12 BB13 CB01

Claims (4)

[Claims] 1. The waste is treated at a reaction temperature of 330 to remove chlorine components and not to volatilize metal chlorine compounds.
A pyrolysis step of thermally decomposing at a temperature of from 580 ° C. to 580 ° C .; cooling water by spraying room-temperature water onto the pyrolysis gas containing the chlorine component generated in the pyrolysis step; An oil-water separation step of recovering acidic water containing, a cooling / crushing step of cooling and cracking the pyrolysis residue generated in the pyrolysis step, and the heat cooled / crushed in the cooling / crushing step. Dissolving the decomposition residue in a water tank, dissolving the metal chlorine compound generated during the thermal decomposition in water, and separating it from the solid content; taking out the solid content from the water tank, removing the metal from the solid content, and removing And a solid fuel production step of using the solid content as a solid fuel later. 2. The method for producing solid fuel from waste according to claim 1, wherein the pyrolysis of the waste in the pyrolysis step is carried out using a plurality of transfer screws arranged in parallel. A method for producing solid fuel from waste by heating while stirring. 3. The method for producing solid fuel from waste according to claim 1, wherein the cooling and crushing of the pyrolysis residue in the cooling and crushing step is performed using a plurality of transfer screws arranged in parallel. A method for producing solid fuel from waste. 4. A pyrolysis apparatus for heating and thermally decomposing the supplied waste while transporting and stirring it using a plurality of transfer screws arranged in parallel, and a chlorine gas generated by the pyrolysis apparatus. Water is injected into the pyrolysis gas to cool it, and a normal-temperature condensate composed of oil and acidic water, a combustible gas, and a pyrolysis gas cooling device that generates solid matter; and the normal-temperature condensation from the pyrolysis gas cooling device. , A combustible gas, and a solid matter, an oil-water separator that separates the room temperature condensate into pyrolysis oil and acidic water, and a pyrolysis residue from the pyrolysis device, and a plurality of transfer screws arranged in parallel. A cooling and crushing device for cooling and crushing the pyrolysis residue using the cooling and crushing device; receiving the cooled and crushed pyrolysis residue from the cooling and crushing device; dissolving the metal chlorine compound in water; Precipitate on Equipment for producing solid fuel from waste, comprising: a tank; a solids removal device arranged in the water tank to take out the solids to the outside; and a metal removal device to remove metals from the solids taken out to the outside. .