JP2024052832A - Organic waste treatment equipment - Google Patents

Abstract

[Problem] To reduce untreated materials in an organic waste treatment device. [Solution] The organic waste treatment device comprises a reaction vessel 1 for storing the materials to be treated, an opening/closing lid 141 for opening and closing a discharge side opening 114 provided at the bottom of the reaction vessel 1, and an agitator for agitating the materials to be treated in the reaction vessel 1. When closed, the opening/closing lid 141 covers the discharge side opening 114, and a lid upper surface 141a exposed to the vessel internal space 111 of the reaction vessel 1 is provided close to the vessel inner wall surface 11a of the reaction vessel 1. [Selected Figure] Fig. 11

Description

The present invention relates to an organic waste treatment device.

In recent years, as an alternative to conventional incineration in incinerators or underground burial disposal, attention has been focused on a technology for treating organic waste that hydrolyzes waste in a subcritical state using high-temperature, high-pressure saturated steam (see, for example, Patent Document 1).

In this type of organic waste treatment device, the material to be treated is placed in a sealable reaction vessel, and the reaction vessel is then placed in a subcritical state, where the material is hydrolyzed while being stirred. The product after treatment is removed through a discharge opening at the bottom of the reaction vessel.

Conventional organic waste treatment devices are provided with an on-off valve that opens and closes the discharge port connected to the discharge opening of the reaction vessel. However, a space in which the treated material cannot be stirred is created between the valve body of the on-off valve and the internal space of the reaction vessel, and part of the treated material remains in the unstirred space without being stirred, resulting in the problem that incompletely treated material gets mixed into the treated product.

Patent Publication 2008-055285

The present invention was developed to improve the current situation, and aims to reduce the amount of untreated material in organic waste treatment equipment.

The organic waste treatment device of the present invention comprises a reaction vessel that contains the material to be treated, an opening/closing lid that opens and closes a discharge side opening provided at the bottom of the reaction vessel, and a stirring device that stirs the material to be treated in the reaction vessel, and the opening/closing lid closes the discharge side opening when closed, and the top surface of the lid that is exposed to the internal space of the reaction vessel is provided close to the inner wall surface of the reaction vessel.

The inner wall surface of the container around the discharge side opening may be curved concavely, and the top surface of the lid may be curved concavely along the inner wall surface of the container.

The inner wall surface of the container around the discharge opening may be approximately concave spherical, and the top surface of the lid may be curved approximately concave spherical.

The opening and closing lid may include a cylindrical lid body attached to the discharge side opening and a lid body having a lid protrusion that fits into the lid body, and the inner peripheral surface of the lid body may be tapered so that the inner peripheral surface of the lid protrusion is narrow toward the container internal space, and the outer peripheral surface of the lid protrusion is tapered along the inner peripheral surface of the lid body.

A suction mechanism for reducing the pressure in the internal space of the reaction vessel may be connected to an exhaust pipe connected to the reaction vessel, and the internal space of the reaction vessel containing the material to be treated may be brought to a subcritical state using saturated steam, and the material to be treated may be hydrolyzed while being stirred by the stirring device. After that, before the opening and closing lid is opened, the steam in the internal space may be sucked in by the suction mechanism to bring the internal space closer to the outside air pressure.

The apparatus may include a stand for supporting the reaction vessel, and the reaction vessel may be supported on the stand via a load cell.

Furthermore, a frame-shaped metal member that surrounds the discharge port in a plan view may be provided between the reaction vessel and the load cell.

The reaction vessel may be connected to an input pipe for inputting liquid waste.

The organic waste treatment device of the present invention can reduce the amount of untreated waste.

1 is a schematic front view showing one embodiment of an organic waste treatment device. FIG. FIG. 2 is a schematic rear view showing the embodiment. FIG. 2 is a schematic right side view showing the embodiment. FIG. 2 is a schematic left side view showing the embodiment. FIG. 2 is a schematic plan view showing the embodiment. FIG. 2 is a schematic bottom view showing the embodiment. FIG. 2 is a schematic enlarged front view showing the reaction vessel of the embodiment. FIG. 2 is an enlarged schematic rear view of the reaction vessel of the embodiment. FIG. 2 is an enlarged schematic right side view showing the reaction vessel of the embodiment. FIG. 2 is a schematic enlarged left side view showing the reaction vessel of the embodiment. FIG. 2 is an enlarged front cross-sectional view of the lower part of the reaction vessel and the stand. FIG. 2 is a perspective view showing a cross section of the lower part of the container body. FIG. 13 is an exploded rear perspective view for explaining a configuration for placing a reaction vessel on a stand. FIG. 4 is a rear perspective view showing the piping section together with the upper part of the stand. FIG. 13 is an exploded rear perspective view for explaining a configuration for placing a reaction vessel on a stand in another embodiment. 4 is an enlarged front view showing a lower part of the container body of the embodiment. FIG. FIG. 11 is a schematic side view showing an upper portion of a container according to another embodiment.

Below, an embodiment of an organic waste treatment device of the present invention will be described with reference to the drawings. In the following description, terms such as "front-rear" and "left-right" are used to specify directions, with the left-right direction being defined as the direction in which the rotation shaft of the agitator extends, and the front-rear direction being defined as the direction perpendicular to the left-right direction and the vertical direction. These terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[Overall Schematic Configuration]
1 to 6 are schematic front, rear, right side, left side, plan and bottom views showing an embodiment of an organic waste treatment device. Figures 7 to 10 are schematic front, rear, right side and left side views showing a cross section of the stand and an enlarged view of the reaction vessel 1.

The organic waste treatment device 100 includes a reaction vessel 1 that contains the material to be treated, a discharge side opening/closing lid 141 that opens and closes a discharge side opening 114 provided at the bottom of the vessel body 11 of the reaction vessel 1, and an agitator 2 that agitates the material to be treated in the reaction vessel 1. The organic waste treatment device 100 puts the material to be treated, such as organic waste, into the sealable reaction vessel 1, then makes the reaction vessel 1 subcritical with high-temperature, high-pressure saturated steam injected from a steam injection pipe 12, and hydrolyzes the material to be treated while stirring it with the agitator 2. The product after treatment is taken out from the discharge side opening 114 provided at the bottom of the reaction vessel 1.

The vessel body 11 of the reaction vessel 1 is made of, for example, stainless steel, is formed into an approximately spherical body, and is capable of containing the material to be treated. The vessel internal space 111 (see Figures 11 and 12) of the vessel body 11 is approximately spherical. The reaction vessel 1 is made of a metal such as stainless steel, and has a pressure resistance of, for example, up to about 5 MPa (megapascals). The reaction vessel 1 is placed on a stand 4.

An input section 13 is provided at the top of the container body 11, through which the material to be treated can be input into the container internal space 111. The input section 13 includes an input tube 131 with top and bottom openings connected to a circular input port 112 that opens at the top of the container body 11, and an opening/closing lid 132 on the input side that sealably covers the top end of the input tube 131.

A discharge section 14 is provided at the bottom of the container body 11, which allows the processed product to be removed from the container internal space 111. The discharge section 14 is equipped with a discharge-side opening/closing lid 141 that sealably covers a circular discharge-side opening 114 that opens at the bottom of the container body 11. The discharge-side opening 114 is formed at the top of the bottom of the container body 11, so that the processed product can be discharged by gravity from a discharge port 148 (see Figures 11 and 12) provided at the discharge-side opening 114.

A steam injection pipe 12 is connected to the top of the vessel body 11 for injecting high-temperature, high-pressure saturated steam into the vessel internal space 111. A steam exhaust pipe 15, a safety valve connection pipe 16, an air exhaust pipe 17, a pressure gauge connection pipe 18, and a thermometer connection pipe 19 are connected to the side of the input tube 131 of the reaction vessel 1. Pipes provided in the piping section 7 are connected to the pipes 12, 15, 16, and 17. A pressure gauge (not shown) for measuring the pressure of the vessel internal space 111 is connected to the pressure gauge connection pipe 18. A thermometer (not shown) for measuring the temperature of the vessel internal space 111 is connected to the thermometer connection pipe 19.

The agitator 2 includes a rotating shaft 21 that is inserted horizontally through the container body 11, a prime mover 22 for rotating the rotating shaft 21, and a power transmission mechanism 23 for transmitting the power of the prime mover 22 to the rotating shaft 21. A stirring blade 25 is attached to the rotating shaft 21 via an arm 24. The agitator 2 rotates the stirring blade 25 around the rotating shaft 21 within the container internal space 111 to agitate the material to be treated that is contained in the container internal space 111.

[Configuration of the discharge section and the opening/closing lid]
Fig. 11 is an enlarged front cross-sectional view of the lower part of the reaction vessel 1 and the stand 4. Fig. 12 is a perspective view showing the cross section of the lower part of the vessel body 11, as viewed diagonally from the left rear. The configuration of the discharge section 14 will be described with reference to Figs. 11 and 12 as well.

As described above, the reaction vessel 1 is provided with an opening/closing lid 141 that opens and closes the discharge side opening 114 provided at the bottom of the vessel body 11. The opening/closing lid 141 is a sealed lid known as a clutch door, and includes a substantially cylindrical lid body 142 attached to the discharge side opening 114, a lid body 144 having a lid protrusion 143 that fits into the lid body 142, and a ring body 145 that connects the lid body 142 and the lid body 144. The lid body 142, the lid body 144, and the ring body 145 are made of metal.

The lid body 142 is generally cylindrical and is fixed to the container body 11 by welding or the like so as to protrude outward from the container body 11. The upper end of the lid body 142 fits into the discharge side opening 114. The inner peripheral surface 142b of the lid body 142 is formed in a tapered shape that is narrow on the container internal space 111 side. The opening of the lid body 142 communicates with the inside and outside of the container body 11, forming a discharge port 148.

The lid body 144 has a generally truncated cone-shaped lid protrusion 143 that fits into the lid body 142, and a generally disk-shaped flange portion 146 that is larger in diameter than the lid protrusion 143. The outer peripheral surface 143b of the lid protrusion 143 is tapered to fit the inner peripheral surface 142b of the lid body 142.

The ring body 145 is generally cylindrical with an inner diameter larger than the outer diameter of the lid body 142 and the lid body 144. The ring body 145 has a plurality of body-side projections 145a protruding inward from the upper end of its inner circumferential surface, and a plurality of lid-side projections 145b protruding inward from the lower end of its inner circumferential surface.

When the opening/closing lid 141 is closed, the multiple main body protrusions 142c protruding outward from the lower end of the outer peripheral surface of the lid body 142 and the multiple lid body protrusions 146a protruding from the outer peripheral surface of the flange-shaped portion 146 of the lid body 144 are sandwiched between the protrusions 145a and 145b of the ring body 145. As a result, the bottom surface of the lid body 142 and the top surface of the flange-shaped portion 146 of the lid body 144 are in close contact with each other, and the gasket 142d such as an O-ring provided on the bottom surface of the lid body 142 is crushed, sealing the discharge side opening 114 to which the opening/closing lid 141 is attached.

When opening the opening/closing lid 141, the ring body 145 is rotated so that the lid side protrusions 145b are positioned between the adjacent lid body protrusions 146a of the lid body 144. This makes it possible to pull the lid body 144 out of the ring body 145.

11, the lid body 144 is connected to the outer peripheral surface of the lower part of the container body 11 via a hinge member 147 having a substantially horizontal rotation axis 147a. The outer peripheral surface 143b of the lid protrusion 143 is formed in a tapered shape with a narrower side toward the container internal space 111, so that it can rotate around the rotation axis 147a of the hinge member 147 and fit into the lid body 142. Therefore, the opening and closing mechanism of the lid body 144 can be formed with a simple configuration of the hinge member 147, and the manufacturing cost of the opening and closing lid 141 can be reduced. Note that the opening and closing mechanism of the lid body 144 is not limited to the hinge member, and may be configured, for example, to move the lid protrusion 143 to the outside of a position below the discharge port 148 after pulling it straight out along the central axis of the lid body 142 and the ring body 145. In this case, the inner peripheral surface 142b of the lid body 142 and the outer peripheral surface 143b of the lid protrusion 143 may be parallel to the central axis of the lid body 142 instead of being tapered.

As shown in Figures 11 and 12, when the opening/closing lid 141 is closed, the lid top surface 141a of the opening/closing lid 141 closes the discharge side opening 114 and is exposed to the container internal space 111. The lid top surface 141a is formed by the main body top surface 142a of the lid main body 142 and the convex top surface 143a of the lid convex portion 143.

When the opening/closing lid 141 is closed, the lid top surface 141a is disposed close to the discharge side opening 114. This makes it possible to eliminate the space around the discharge side opening 114 where the processed material remains when the processed material is stirred by the stirring device 2, and to reduce unprocessed processed material. In this embodiment, no step is formed between the outer peripheral edge of the lid top surface 141a (here, the upper end of the lid main body 142) and the upper opening end of the discharge side opening 114. In addition, in the lid top surface 141a, no step is formed between the inner peripheral edge of the lid top surface 141a and the outer peripheral edge of the convex top surface 143a. This makes it possible to reliably eliminate the space where the processed material remains when the processed material is stirred.

The lid upper surface portion 141a is curved in an approximately concave spherical shape along the approximately concave spherical container inner wall surface 11a around the discharge side opening 114. This prevents the agitator blade 25 passing over the lid upper surface portion 141a when the agitator 2 is driven from contacting the lid upper surface portion 141a even when the agitator blade 25 is rotated close to the container inner wall surface 11a of the container body 11, improving the agitation efficiency. The lid upper surface portion 141a may be located above the spherical shape of the container inner wall surface 11a (toward the center of the container body 11) to the extent that the rotation of the agitator blade 25 is not hindered. For example, the lid upper surface portion 141a may be formed along a spherical shape with a larger diameter than the spherical shape of the container inner wall surface 11a.

The lid upper surface portion 141a may be located on the lower side (away from the center of the container body 11) of the spherical shape of the container inner wall surface 11a to the extent that the processed material does not remain when the processed material is stirred. For example, the lid upper surface portion 141a may be formed along a spherical shape with a smaller diameter than the spherical shape of the container inner wall surface 11a, so that the lid upper surface portion 141a may be located on the lower side of the spherical shape of the container inner wall surface 11a. In addition, the outer peripheral edge portion of the lid upper surface portion 141a may be located slightly lower than the upper end of the opening of the discharge side opening 114, and a step may be formed between the lid upper surface portion 141a and the container inner wall surface 11a to the extent that the processed material does not remain when the processed material is stirred. The step may be used, for example, as a welding allowance. In addition, the container body 11 and the lid body 142 may be integrally molded.

Also, the upper end surface of the lid body 142, which has an inner diameter the same as the opening diameter of the discharge side opening 114, may be arranged facing the outer wall of the container body 11 surrounding the discharge side opening 114, and the convex upper surface portion 143a of the lid body 144 may cover the entire opening of the discharge side opening 114. In this case, the discharge side opening 114 forms the discharge port, and the lid upper surface portion 141a is composed only of the convex upper surface portion 143a.

The concave shape of the lid upper surface 141a does not have to be a substantially concave spherical shape, so long as it is a concave shape that does not come into contact with the stirring blade 25. For example, if the container body 11 is a horizontally oriented cylindrical shape, the lid upper surface 141a of the opening/closing lid 141 can be curved in a concave shape along the container inner wall surface of the container body 11.

[Configuration of the stand]
Fig. 13 is a rear perspective view for explaining the mounting configuration of the reaction vessel 1 on the stand 4. Fig. 14 is a rear perspective view showing the piping section 7 together with the upper part of the stand 4. The stand 4 will be explained with reference to Figs. 12 and 13 as well.

The stand 4 has four pillars 40 erected on the device installation surface F. Each of the four pillars 40 is formed of H-shaped steel with its strong axis aligned in the left-right direction, and is arranged at the corners of a rectangle aligned in the front-rear and left-right directions. A first beam member 41 extending in the left-right direction is horizontally installed between the middle parts of the pillars 40 lined up on the left and right. A pair of left and right second beam members 42 extending in the front-rear direction are horizontally installed with a gap between them between the middle parts of the front and rear first beam members 41. A pair of front and rear third beam members 43 extending in the left-right direction are horizontally installed with a gap between them between the middle parts of the left and right second beam members 42. The beam members 41, 42, and 43 are formed of H-shaped steel of the same size (cross-sectional area) as the pillars 40.

A fourth beam member 44 extending in the front-rear direction is laid horizontally between the middle parts of the pillars 40 lined up in front and behind. The fourth beam member 44 is formed of H-shaped steel that is smaller than the pillars 40. On both the left and right sides and the back of the stand 4, braces 50 are provided that connect the lower parts of the pillars 40 to the middle parts of the first beam member 41 or the fourth beam member 44. The braces 50 are formed of L-shaped angle steel. No braces are provided on the front of the stand 4, making it easy for workers working on the equipment installation surface F to enter and exit the stand 4 from the front.

A fifth beam member 45 forming a fire beam is provided at each of the four corners of the rectangle surrounded by the second beam member 42 and the third beam member 43. Between the second beam member 42 and the fourth beam member 44, a pair of sixth beam members 46 extending in the left-right direction on the left-right extension of the third beam member 43 are horizontally laid with a gap in the front-rear direction. A seventh beam member 47 extending in the front-rear direction is horizontally laid between the front first beam member 41 and the third beam member 43, between the rear first beam member 41 and the third beam member 43, and between the rear first beam member 41 and the sixth beam member 46. The beam members 45, 46, and 47 are formed of H-shaped steel of a size smaller than that of the fourth beam member 44.

Between the front and rear sixth beam members 46, an eighth beam member 48 extending in the front-rear direction is horizontally disposed. The eighth beam member 48 is formed of a C-shaped steel (channel steel) smaller in size than the beam members 45, 46, and 47. A ninth beam member 49 extending in the left-right direction is horizontally disposed between the three seventh beam members 47 on the rear side and the beam members 42 and 44. The ninth beam member 49 is also horizontally disposed between the first beam member 41 and the sixth beam member 46 on the front side. The ninth beam member 49 is formed of an L-shaped angle steel smaller in size than the eighth beam member 48.

The reaction vessel 1 is placed at the intersection of the second beam member 42 and the third beam member 43. The reaction vessel 1 has four metal support legs 20 arranged at equal intervals in the circumferential direction on the lower part of the outer circumferential surface of the vessel body 11. A metal plate-shaped vessel mounting stand 61 is fixed to the intersection of the second beam member 42 and the third beam member 43 and is arranged across the second beam member 42, the third beam member 43 and the fifth beam member 45. The support legs 20 of the reaction vessel 1 are placed on the vessel mounting stand 61 via a load cell 62.

In this way, the stand 4 receives the load of the reaction vessel 1 with the support pillars 40 and beam members 41, 42, and 43 formed from relatively large steel material. Furthermore, a fifth beam member 45 constituting a flint beam is provided at the location where the reaction vessel 1 is placed, and the reaction vessel 1 can be placed on a vessel placement stand 61 fixed across the beam members 42, 42, and 45. As a result, the stand 4 can ensure the strength to support the reaction vessel 1 even if the other beam members 44, 46 to 49 are made relatively small in size, and the weight and manufacturing costs of the stand 4 can be reduced.

The organic waste treatment device 100 of this embodiment is equipped with a load cell 62 between the support legs 20 of the reaction vessel 1 and the vessel mounting stand 61 of the stand 4. The load cell 62 can be used to measure the weight of the material to be treated contained in the reaction vessel 1. If the weight of the material to be treated contained in the reaction vessel 1 is known before treatment begins, treatment efficiency can be improved, for example, by adding water to the reaction vessel 1 before treatment begins depending on the moisture content of the material to be treated to achieve an appropriate moisture content.

Each of the four support legs 20 of the reaction vessel 1 is placed on the load cell 62, but as shown in Figures 15 and 16, a single frame-shaped metal plate member 68 that surrounds the discharge section 14 may be interposed between the four support legs 20 and the load cell 62. With this configuration, the frame-shaped metal plate member 68 distributes the load of the reaction vessel 1, preventing the load from concentrating on one load cell 62, and improving the measurement accuracy of the weight of the processing object contained in the reaction vessel 1. In addition, the heat transferred from the support legs 20 of the reaction vessel 1 to the load cell 62 during processing can be dissipated by the frame-shaped metal plate member 68, preventing damage to the load cell 62 due to heat.

The shape of the frame-shaped metal plate member 68 is not limited to a rectangular frame, but may be any frame shape that can be arranged across each load cell 62 while positioning the discharge port 148 within the frame. For example, the frame-shaped metal plate member 68 may be donut-shaped (annular).

In addition, by interposing the load cell 62 between the reaction vessel 1 and the vessel mounting table 61, the gap between the vessel body 11 and the beam members 42, 43, and 45 is increased. This allows the air around the reaction vessel 1 to flow more easily during processing, improving the cooling performance of the lower part of the vessel body 11 and the load cell 62, and preventing damage to the load cell 62 due to heat.

Continuing with the explanation of the stand 4, a first metal floor plate material 63 is laid on top of the beam members 41 to 49, except for the portion on which the reaction vessel 1 is placed. A plurality of first safety fences 64 are erected on top of the first beam member 41 and the fourth beam member 44 along the first beam member 41 or the fourth beam member 44.

A first upper beam member 51 extending in the front-rear or left-right direction is installed between the upper ends of adjacent columns 40. The first upper beam member 51 is made of H-shaped steel of the same size as the fourth beam member 44. A metal upper end plate 65 is joined to the upper end of the column 40.

Four second upper beam members 52 extending in the front-rear direction are horizontally disposed between the front and rear first upper beam members 51. The four second upper beam members 52 are arranged at intervals in the left-right direction, and the input section 13 of the reaction vessel 1 is disposed between the two second upper beam members 52 closer to the center in the left-right direction. The second upper beam members 52 are formed of C-shaped steel that is smaller in size than the seventh beam member 47 and larger in size than the eighth beam member 48.

A number of third upper beam members 53 are horizontally arranged at intervals in the front-to-rear direction between the first upper beam member 51 and the second upper beam member 52, and between adjacent second upper beam members 52. A second metal floor plate material 66 is laid on the upper beam members 51 to 53. A number of second safety fences 67 are erected on the upper beam members 51, 52 along the upper beam members 51 or 52.

Two third upper beam members 53 are provided between the two second upper beam members 52 near the center of the left and right of the four second upper beam members 52, sandwiching the input section 13 of the reaction vessel 1 from the front and rear. The rear of the input section 13 is the installation area of the piping section 7. A second floor plate material 66 is laid around the input section 13, but the second floor plate material 66 is not laid in the installation area of the piping section 7.

The upper beam members 52, 53 are positioned higher than the steam injection pipe 12 of the reaction vessel 1, and lower than the steam exhaust pipe 15, the safety valve connection pipe 16, the air exhaust pipe 17, the pressure gauge connection pipe 18, and the thermometer connection pipe 19. The steam injection pipe 12 is accessible from the second floor (above the first floor plate material 63) of the stand 4, and the pipes 16 to 19 are accessible from the third floor (above the second floor plate material 66). In the organic waste treatment device 100, the steam injection system and exhaust system of the piping section 7 are arranged above and below.

The opening/closing lid 132 on the input side of the input section 13 of the reaction vessel 1 can be accessed from the third floor (above the second floor plate material 66), and the opening/closing lid 141 of the discharge section 14 can be accessed from the first floor (the device installation surface F).

[Configuration of piping section]
Next, the configuration of the piping section 7 will be described with reference to Figures 1 to 10 and 14. As shown in Figure 9 etc., the steam injection piping section 71 connected to the steam injection pipe 12 is disposed so as to extend rearward in the front-rear direction from the steam injection pipe 12. A pipe end of the steam injection piping section 71 is disposed at the rear of the frame 4 and is connected to a steam supply pipe 82 extending from a steam header 81. The steam header 81 stores steam supplied from a boiler (not shown).

In the middle of the steam injection pipe section 71, an injection side opening/closing valve 711, an injection flow rate control valve 712, an injection side separator 713, and a steam check valve 714 are provided in this order from the rear side. Although the opening/closing operation mechanisms of the injection side opening/closing valve 711 and the injection flow rate control valve 712 are not shown, the valves 711 and 712 may be automatically controllable or may be configured to be manually controlled. The injection side separator 713 removes water droplets contained in the steam. The removed water droplets are discharged through a steam water droplet drain pipe 715 that extends from the lower part of the injection side separator 713 to the rear in the front-to-rear direction. A check valve 716 is provided in the middle of the steam water droplet drain pipe 715.

The air discharge pipe section 72 connected to the air discharge pipe 17 is arranged to extend from the air discharge pipe 17 toward the rear in the front-rear direction. An inlet side strainer 721, a steam trap 722, etc. are provided in the middle of the air discharge pipe section 72, in that order from the air discharge pipe 17 side. The air discharge pipe section 72 removes and discharges solid components and water droplets contained in the gas discharged from the air discharge pipe 17 when steam is injected from the steam injection pipe 12 into the container internal space 111, using the inlet side strainer 721 and the steam trap 722. The water droplets removed by the steam trap 722 are discharged via an air drain pipe 723 that extends from the bottom of the steam trap 722 toward the rear in the front-rear direction.

The safety valve piping section 73 connected to the safety valve connection pipe 16 is arranged to extend from the safety valve connection pipe 16 toward the rear in the front-rear direction. The safety valve piping section 73 is provided with a safety valve 731 in the middle, and when the pressure in the container internal space 111 rises above the set pressure during processing, the safety valve 731 operates to release steam from the container internal space 111 and reduce the pressure.

As shown in FIG. 10 etc., the steam exhaust pipe 15 is provided on the left side of the input tube 131 at the top of the reaction vessel 1. The steam exhaust pipe section 74 connected to the steam exhaust pipe 15 extends leftward, then extends rearward on the left side of the input tube 131 via a downward U-shaped solids trap 741, and then bends rightward and is led to the rear of the input tube 131. Furthermore, the steam exhaust pipe section 74 is arranged to extend in the front-rear direction from a position near the input tube 131 toward the rear.

The downward U-shaped solid trap 741 can remove relatively large solids from the exhaust steam and can be accessed from the second floor of the stand 4 (above the first floor plate material 63). Solids and the like accumulated in the solid trap 741 can be removed by removing the blind flange provided at the bottom of the solid trap 741. It is also possible to provide blind flanges at two locations on the left and right of the bottom of the solid trap 741. In this way, when removing solids and the like accumulated in the solid trap 741, both blind flanges at the left and right locations can be removed, and a tool can be inserted into the solid trap 741 from one opening to push out the solids and the like from the other opening, improving maintainability. It is also possible to arrange the solid trap 741 behind the input tube 131.

The steam exhaust pipe section 74 branches into a main exhaust pipe section 742 and an emergency exhaust pipe section 747 from the rear of the input tube 131. Both the main exhaust pipe section 742 and the emergency exhaust pipe section 747 are arranged to extend in the front-rear direction. In addition, a vacuum pump (suction mechanism) may be connected to the steam exhaust pipe section 74, and the container internal space 111 may be decompressed by the vacuum pump after the processing material is input and before steam is extracted to improve the extraction efficiency. In addition, after processing, the exhaust side opening and closing valve 744 described later is opened to proceed with steam exhaust, and when the pressure of the container internal space 111 becomes almost equal to the outside air pressure (for example, when it becomes the outside air pressure + 0.02 MPa), the vacuum pump may be used to suck the steam in the container internal space 111 and bring it close to the outside air pressure. This makes it possible to minimize the steam outflow sound and steam/odor generated when the opening and closing lid 132 is opened at the end of processing. The vacuum pump may be automatically controlled or may be configured to be manually controlled.

The main exhaust pipe section 742 is equipped with an exhaust side strainer 743, an exhaust side opening/closing valve 744, and an exhaust flow rate adjustment valve 745, in that order from the upstream side of the exhaust flow. The exhaust side strainer 743 removes relatively small solids contained in the exhaust steam. The opening/closing mechanism of the exhaust side opening/closing valve 744 and the exhaust flow rate adjustment valve 745 is not shown, but the valves 744, 745 may be automatically controllable or may be configured to be manually controlled. A condenser 746 that liquefies the steam is connected to the downstream side of the exhaust flow of the main exhaust pipe section 742. The condenser 746 is installed vertically long at the rear of the frame 4 and is accessible from the second floor (above the first floor plate material 63).

A manual on-off valve 748 is provided midway through the emergency exhaust pipe section 747. In the event of an emergency in which the pressure in the container internal space 111 rises above the set pressure during processing and does not fall, the manual on-off valve 748 can be opened to release steam from the container internal space 111 and reduce the pressure.

As can be seen from Figures 5, 9, 10, 14, etc., most of the pipes and parts that make up the piping section 7 are arranged together behind the reaction vessel 1, making the piping system easy to maintain. In addition, the piping section 7 is provided at the height of the second upper beam member 52 of the frame 4 and is accessible from both the second and third floors, making it easy to maintain as well.

The pipes and parts of the piping section 7 can be supported by a portal frame erected on the second floor behind the reaction vessel 1. The portal frame can be erected on the left and right second beam members 42, which are relatively large in size. In this way, a sturdy portal frame can be formed, and the pipes and parts of the piping section 7 can be safely supported.

[Configuration of the Stirring Device]
7 to 10, the configuration of the agitator 2 will be described. As described above, the agitator 2 includes the rotating shaft 21 that is inserted substantially horizontally through the container body 11, the prime mover 22 for rotating the rotating shaft 21, and the power transmission mechanism 23 that transmits the power of the prime mover 22 to the rotating shaft 21.

A pair of left and right bearing bases 211 are fixed to the left and right side surfaces of the container body 11, protruding outward to the left and right. Both ends of the rotating shaft 21 are rotatably supported by bearings 212 provided on the bearing bases 211. Rotating shaft sprockets 213 are fixed to both ends of the rotating shaft 21, respectively, outside the left and right of the bearings 212.

The prime mover 22 is, for example, an electric motor with a reduction gear, and is placed on a prime mover support plate 221 fixed to straddle the second beam member 42 and the seventh beam member 47 of the stand 4 behind the reaction vessel 1. A prime mover sprocket 223 is fixed to the output shaft 222 of the prime mover 22. Note that it is also possible to adopt other prime movers such as an internal combustion engine or a hydraulic motor as the prime mover 22.

The power transmission mechanism 23 includes a transmission rotation shaft 231 provided between the prime mover 22 and the reaction vessel 1. The transmission rotation shaft 231 is arranged to extend in the left-right direction. A bearing stand 232 is fixed to each of the three seventh beam members 47 provided near the rear of the stand 4. The left and right ends and the left-right center of the transmission rotation shaft 231 are rotatably supported by bearings 233 attached to the bearing stand 232.

A driven sprocket 234 is fixed to the transmission rotation shaft 231 in front of the prime mover sprocket 223. A drive chain 235 is looped between the prime mover sprocket 223 and the driven sprocket 234, enabling the power of the prime mover 22 to be transmitted to the transmission rotation shaft 231. The sprockets 223, 234 and the drive chain 235 are covered by a cover 236.

Both ends of the transmission rotating shaft 231 are disposed diagonally below and behind both ends of the rotating shaft 21. A transmission shaft sprocket 237 is fixed to each end of the transmission rotating shaft 231. Left and right driven chains 238 are wound between the left and right rotating shaft sprockets 213 and the left and right transmission shaft sprockets 237. This allows the power of the prime mover 22 to be transmitted to the rotating shaft 21 via the power transmission mechanism 23, and the arm 24 and the mixing blade 25 to rotate around the rotating shaft 21 within the container internal space 111, thereby mixing the material to be treated. The sprockets 213, 237 and the driven chain 238 are covered with a cover 239.

The power of the prime mover 22 is transmitted to both ends of the rotating shaft 21 via the power transmission mechanism 23, so that even if a load is applied to the rotating shaft 21 during processing, the rotating shaft 21 will not twist, improving durability and maintaining smooth mixing. In addition, the prime mover 22 may be switched between forward and reverse rotation during one processing cycle to rotate the mixing blade 25 in the opposite direction for efficient mixing. In addition, the rotation speed of the mixing blade 25 may be changed during one processing cycle to perform efficient mixing; for example, the rotation speed may be configured to be changeable between "high speed", "medium speed", and "low speed".

Furthermore, the prime mover 22 and power transmission mechanism 23 are positioned to effectively utilize the empty space below the piping section 7, allowing the organic waste treatment device 100 to be compact. Also, if the empty spaces on both sides of the prime mover 22 on the second floor are effectively utilized as installation areas for the oil compressor 8 and air compressor 9, an even more compact organic waste treatment device 100 can be realized.

[Other embodiments]
17 is a schematic side view showing the upper part of the vessel of another embodiment. In the organic waste treatment device 100 of this embodiment, an input pipe 91 for inputting liquid waste is connected to the reaction vessel 1. This embodiment is configured so that liquid waste can be input from the input pipe 91 into the reaction vessel 1 without opening or closing the opening/closing lid 132 on the input side.

The input pipe 91 is connected to the side of the input tube 131. The end of the input pipe 91 opposite the reaction vessel 1 is connected to a tank 92 that stores liquid waste. The liquid waste stored in the tank 92 is, for example, a slurry liquid such as pig feces or sludge. A first input on-off valve 93 and a second input on-off valve 94 are provided in series in the middle of the input pipe 91. A cleaning water pipe 95 is connected to the middle of the input pipe 91 between the first input on-off valve 93 and the second input on-off valve 94. The end of the cleaning water pipe 95 opposite the input pipe 91 is connected to a cleaning water supply unit 96 that supplies cleaning water. A cleaning water on-off valve 97 is provided in the middle of the cleaning water pipe 95.

When the liquid waste in the tank 92 is put into the reaction vessel 1, the first and second input on-off valves 93, 94 are opened with the input side opening/closing lid 132 and the discharge side opening/closing lid 141 closed, and the liquid waste is allowed to flow into the reaction vessel 1. At this time, the discharge side on-off valve 744 of the steam discharge pipe section 74 may be opened, and further, a vacuum pump (suction mechanism) connected to the steam discharge pipe section 74 may be operated to reduce the pressure in the vessel internal space 111 of the reaction vessel 1, thereby improving the efficiency of liquid waste input. In addition, the cleaning water on-off valve 97 may be opened to allow cleaning water to flow into the vessel internal space 111 together with the liquid waste.

In this embodiment, liquid waste can be fed into the reaction vessel 1 from the feeding pipe 91 with the opening/closing lid 132 on the feeding side closed. This prevents the odor released from the liquid waste from diffusing around the reaction vessel 1, improving the working environment. When reducing the pressure in the vessel internal space 111 with a vacuum pump connected to the steam exhaust pipe section 74, a deodorizing device may be connected midway through the steam exhaust pipe section 74 to prevent the emission of odors.

After the liquid waste is charged into the reaction vessel 1, the first input on-off valve 93 is opened while the second input on-off valve 94 is closed, and the cleaning water on-off valve 97 is opened to allow cleaning water to flow from the cleaning water supply unit 96 through the cleaning water pipe 95 into the input pipe 91 to clean the input pipe 91. The part of the input pipe 91 close to the reaction vessel 1 is inclined diagonally downward toward the reaction vessel 1. This makes it difficult for liquid waste to remain inside the part of the input pipe 91 close to the reaction vessel 1. Note that when the reaction vessel 1 is brought to a subcritical state with high-temperature, high-pressure saturated steam to hydrolyze the liquid waste, the first input on-off valve 93 is closed. The second input on-off valve 94 and the cleaning water on-off valve 97 are not subjected to high pressure during treatment, so cheaper on-off valves can be selected compared to the first input on-off valve 93, thereby reducing manufacturing costs.

In FIG. 17, the input pipe 91 is connected to the input tube 131 of the reaction vessel 1, but it may be connected to the upper part of the vessel body 11. Also, a pump may be provided midway through the input pipe 91 to send liquid waste from the tank 92 to the reaction vessel 1.

Although the embodiment has been described above, the present invention is not limited to the above-mentioned embodiment, but can be embodied in various forms. The configuration of each part is not limited to the illustrated embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the configurations described in the above-mentioned embodiment and modified examples (notes, etc.) may be combined, and additions, omissions, substitutions, and other modifications of configurations are possible.

For example, the bearing 212 that rotatably supports the rotating shaft 21 may be supported by a bearing support frame provided on the stand 4. In this case, the size of the beam member on which the bearing support frame is erected on the stand 4 may be increased to increase the support rigidity of the bearing 212. Also, a load cell may be interposed between the bearing support frame and the beam member, and the weight of the processing material introduced into the container internal space 111 may be measured by the load cell and the load cell 62 below the support leg 20 of the container body 11. In this case, a plate-like member that covers these load cells may be interposed between the bearing support frame and the load cell below it, and between the support leg 20 and the load cell 62, to distribute the load of the reaction container 1 to these load cells.

Two organic waste treatment devices 100 may be arranged side-by-side, with the organic waste treatment devices 100 sharing the steam header 81. The steam exhaust pipe 15 may be connected to the input tube 131. At least one of the safety valve connection pipe 16, the air exhaust pipe 17, the pressure gauge connection pipe 18, and the thermometer connection pipe 19 may be connected to the container body 11.

This specification includes the following embodiments:

12, 13, etc., the organic waste treatment device of the embodiment includes a reaction vessel 1 that contains the material to be treated and has a discharge port 148 at the bottom, and a stand 4 that supports the reaction vessel 1. The stand 4 includes four pillars 40 erected at the corners of a rectangle in a plan view on the installation surface of the device, a pair of first beam members 41 horizontally disposed between the pillars 40 aligned in a first direction along one side of the rectangle, a pair of second beam members 42 extending in a second direction perpendicular to the first direction and horizontally disposed between the middle parts of the first beam members 41 at a distance from each other, a pair of third beam members 43 extending in the first direction and horizontally disposed between the middle parts of the second beam members 42 at a distance from each other, and a fifth beam member 45 provided at each of the four corners of the rectangle surrounded by the second beam member 42 and the third beam member 43. The fifth beam member 45 forms a fire-strike beam member. The pillars 40 and the beam members 41, 42, 43, and 45 are made of steel. The reaction vessel 1 is placed across the second beam member 42, the third beam member 43, and the fifth beam member 45, with the outlet 148 positioned within the rectangular frame in a plan view at the intersection of the second beam member 42 and the third beam member 43.

According to the organic waste treatment device of this embodiment, the load of the reaction vessel 1 is received by the support pillars 40 and the first to third beam members 41 to 43 formed of steel material, and the fifth beam member 45 (flint beam member) is provided where the reaction vessel 1 is placed, so that the support rigidity of the reaction vessel 1 can be improved. As a result, even if the size of the other beam members constituting the stand 4 (for example, the fourth beam member 44 and the sixth to ninth beam members 46 to 49 shown in Figures 1 to 13) is relatively small, the strength to support the reaction vessel 1 can be ensured, and the weight and manufacturing costs of the stand 4 can be reduced.

As shown in Figures 7 to 10, the fifth beam member 45 (flint beam member) is formed from steel material with a smaller cross-sectional area than the first to third beam members 41 to 43.

According to this embodiment, the cross-sectional area of the fifth beam member 45 (flint beam member) can be made relatively small, thereby further reducing the weight and manufacturing costs of the stand.

As shown in Figures 7 to 12, etc., in the frame 4, a metal container mounting stand 61 is fixed to the intersection of the second beam member 42 and the third beam member 43, and is disposed across the second beam member 42, the third beam member 43, and the fifth beam member 45. The reaction vessel 1 is placed on the container mounting stand 61.

In this embodiment, the reaction vessel mounting portion of the stand 4 can be made to have a more sturdy structure, so that the reaction vessel 1 can be reliably supported, improving safety.

As shown in Figures 1 to 4, 6, etc., the frame 4 includes a pair of fourth beam members 44 that are horizontally disposed between the pillars aligned in the second direction. The fourth beam members 44 are provided to extend in the second direction. Of the four outer peripheral side surfaces surrounded by the pillars 40 and the first and fourth beam members 41, 44, braces 50 are provided on three of the outer peripheral side surfaces that connect the lower part of the pillar 40 to the middle part of the first or fourth beam member 41 or 44.

According to this embodiment, the provision of the brace 50 can improve the rigidity and strength of the pedestal 4, and by not providing a brace 50 on one of the four outer peripheral sides, workers can easily enter and exit the pedestal 4, improving workability.

As shown in Figures 7 to 13, the reaction vessel 1 is supported on the stand 4 via a load cell 62.

In this embodiment, the weight of the material to be treated contained in the reaction vessel 1 can be measured, so that the processing efficiency can be improved by adjusting the processing time and processing temperature or adding moisture according to the weight of the material to be treated and the moisture content measured in advance.

Also, as shown in FIG. 15, a frame-shaped metal plate member 68 (frame-shaped metal member) that surrounds the discharge port 148 in a plan view may be provided between the reaction vessel 1 and the load cell 62.

According to this embodiment, the frame-shaped metal plate member 68 distributes the load of the reaction vessel 1, preventing the load from concentrating on one load cell 62, and improving the measurement accuracy of the weight of the processing object contained in the reaction vessel 1. In addition, the frame-shaped metal plate member 68 can dissipate heat transferred from the reaction vessel 1 to the load cell 62 during processing, preventing damage to the load cell 62 due to heat.

As shown in Figures 5, 7 to 10, 13, 14, etc., the organic waste treatment device of the embodiment includes a reaction vessel 1 that has an inlet 112 at the top and an outlet 148 at the bottom, and that contains the material to be treated. The reaction vessel 1 includes an inlet tube 131 with top and bottom openings that is connected upward to the inlet 112 that opens at the top of the vessel body 11, and an opening and closing lid 132 on the inlet side that sealably closes the top end of the inlet tube 131. A steam injection pipe 12 for injecting saturated steam into the vessel internal space 111 is connected to the top of the vessel body 11. Meanwhile, a steam exhaust pipe 15, a safety valve connection pipe 16, and an air exhaust pipe 17 are connected to the side of the inlet tube 131.

In this embodiment of the organic waste treatment device, the steam injection system piping and the exhaust system piping can be arranged vertically inside the reaction vessel 1, reducing the chance of confusing the injection system piping and the exhaust system piping during maintenance, improving maintainability.

As shown in Figures 5, 9, 10, 14, etc., the organic waste treatment device of this embodiment is equipped with a piping section 7 in which the piping extending from the steam injection pipe 12, the steam exhaust pipe 15, the safety valve connection pipe 16, and the air exhaust pipe 17 each extend in the same direction from a position near the reaction vessel 1.

In this embodiment, the piping system can be arranged together, making it easy to maintain.

As shown in Figures 9, 10, 14, etc., the organic waste treatment device of this embodiment includes a stand 4 that supports the reaction vessel 1. The stand 4 includes a first floor plate 63 (first floor section) provided at the height of the lower part of the reaction vessel 1, and a second floor plate 66 (second floor section) provided at the height of the upper part of the reaction vessel 1. The pipes that make up the piping section 7 extend along the second floor plate 66 (second floor).

In this embodiment, each pipe can be accessed from both the first and second floor sections, improving maintainability.

As shown in Figures 8 to 10, 14, etc., the organic waste treatment device of this embodiment is equipped with an agitator 2 that agitates the material to be treated in the reaction vessel 1. The drive source of the agitator 2 (motor 22 and power transmission mechanism 23) is installed on the first floor plate material 63 (first floor section) below the piping section 7.

In this embodiment, the empty space in the first floor section below the piping section 7 can be effectively utilized, allowing the organic waste treatment device to be formed compactly.

The configurations of the above embodiments may be combined, and additions, omissions, substitutions, and other modifications of configurations are possible.

1 Reaction vessel, 2 Stirring device, 4 Stand, 7 Piping section, 11 Container body, 11a Container inner wall surface, 100 Organic waste treatment device, 111 Container internal space, 114 Discharge side opening, 141 Opening and closing lid, 141a Lid top surface, 142 Lid body, 142a Body top surface, 142b Inner circumferential surface, 142c Body protrusion, 142d Gasket, 143 Lid protrusion, 143a Protrusion top surface, 143b Outer circumferential surface, 144 Lid body, 145 Ring body, 145a Body side protrusion, 145b Lid side protrusion, 146 Flange-shaped portion, 146a Lid body protrusion, 148 Discharge port

Claims (8)

A reaction vessel for accommodating an object to be treated;
an opening/closing lid for opening and closing a discharge side opening provided at a bottom of the reaction vessel;
a stirring device for stirring the material to be treated in the reaction vessel;
the opening/closing lid closes the discharge side opening when closed, and a lid upper surface portion exposed to the internal space of the reaction vessel is provided close to an inner wall surface of the reaction vessel;
Organic waste treatment equipment. The inner wall surface of the container around the discharge side opening is curved in a concave shape,
The lid upper surface portion is curved concavely along the inner wall surface of the container.
The organic waste treatment device according to claim 1. The inner wall surface of the container around the discharge side opening is substantially concave spherical,
The lid upper surface is curved into a substantially concave spherical shape.
The organic waste treatment device according to claim 1. The opening/closing lid includes a cylindrical lid body attached to the discharge side opening and a lid body having a lid protrusion that fits into the lid body,
The inner circumferential surface of the lid body is formed in a tapered shape that is narrower toward the container internal space side,
The outer peripheral surface of the lid protrusion is formed in a tapered shape along the inner peripheral surface of the lid body.
The organic waste treatment device according to any one of claims 1 to 3. a suction mechanism for reducing the pressure in the internal space of the reaction vessel is connected to a discharge pipe connected to the reaction vessel;
The internal space of the reaction vessel containing the material to be treated is brought into a subcritical state by saturated steam, the material to be treated is hydrolyzed while being stirred by the stirring device, and then, before the opening/closing lid is opened, the steam in the internal space is sucked by the suction mechanism to make the internal space close to the outside air pressure.
The organic waste treatment device according to claim 1. A stand for supporting the reaction vessel is provided,
The reaction vessel is supported on the stand via a load cell.
The organic waste treatment device according to claim 1. A frame-shaped metal member surrounding the discharge port in a plan view is interposed between the reaction vessel and the load cell.
The organic waste treatment device according to claim 6. An input pipe for inputting liquid waste is connected to the reaction vessel.
The organic waste treatment device according to claim 1.

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