Silo device, and method for repairing the same

Abstract

To provide a silo device for storing palm shells that can suppress corrosion of a storage tank.SOLUTION: A silo device for storing palm shells comprises a storage tank for storing palm shells and has a lining membrane on an inner surface of the storage tank. The silo device has a screw that can rotate horizontally at the bottom of the storage tank and may also have a water sprinkling section for sprinkling water onto the palm shells stored in the storage tank. The lining membrane preferably contains ceramic particles.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a silo system and a method for repairing a silo system. [Background technology]

[0002] Conventionally, a silo device for storing biomass raw materials such as palm shells has been known (see, for example, Patent Document 1). Biomass raw materials such as palm shells are used, for example, as fuel for biomass power generation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-73266 A Summary of the Invention [Problem to be solved by the invention]

[0004] Palm kernel shells (hereinafter sometimes referred to as "PKS") are crushed to, for example, about 5 to 15 mm before use. In a silo device storing PKS, water may be sprayed onto the PKS to prevent dust generation. Since PKS has a relatively low fluidity, it is collected in the silo device by a device such as a screw conveyor. Therefore, the inner surface of the storage tank in the silo device may be a wet environment where friction with the PKS occurs.

[0005] The tank for storing PKS is made of, for example, a material such as a general steel plate. The surface of the general steel plate is usually coated with an anti-rust coating. However, there was a problem that the anti-rust coating on the inner surface of the tank for storing PKS was damaged, causing corrosion of the general steel plate.

[0006] The inventors' research has revealed that when PKS is placed in a humid environment, the humid water containing PKS becomes weakly acidic. For this reason, it is presumed that the inner surface of the tank storing PKS is exposed to a corrosion phenomenon called erosion-corrosion, which is the cause of the above-mentioned corrosion. Erosion-corrosion is a phenomenon in which mechanical deterioration (erosion) caused by friction with PKS and chemical deterioration (corrosion) act in combination.

[0007] The present invention has been made in consideration of the above, and aims to provide a silo apparatus for storing palm shells that can suppress corrosion of the storage tank. [Means for solving the problem]

[0008] The present disclosure relates to a silo apparatus for storing palm shells, the silo apparatus having a storage tank for storing palm shells and a lining membrane on an inner surface of the storage tank. Effect of the Invention

[0009] According to the present disclosure, a silo apparatus for storing palm shells can be provided, which can suppress corrosion of the storage tank. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an overview of a silo device according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <Silo equipment> Hereinafter, an embodiment of the present invention will be described. As shown in FIG. 1, the silo apparatus 1 according to this embodiment has a storage tank 2 for storing palm kernel shells (PKS) P. A lining film L is formed on at least a part of the inner surface of the storage tank 2. The storage tank 2 may further include a screw-type dispensing device 3 and a water sprinkler unit 4 in addition to the above.

[0012] (storage tank) The storage tank 2 is a tank for storing the stored material, PKS. The storage tank 2 is formed by a side wall 21, a ceiling 22, and a bottom 23. In this embodiment, a lining film L is formed on a part of the inner surface 21a of the side wall 21. A water sprinkler unit 4 is installed on the inner surface 22a of the ceiling 22. A screw type dispensing device 3 is installed on the inner surface 23a of the bottom 23.

[0013] The storage tank 2 has a portion made of a general steel plate such as a rolled steel plate. The storage tank 2 may have a portion made of a stainless steel plate other than the general steel plate. In addition to the lining film L, an anti-rust coating film may be formed on any portion of the inner surface of the storage tank 2 made of a general steel plate. An example of the anti-rust coating film is an epoxy resin-based coating film that has excellent moisture resistance. The anti-rust coating film may not be formed on the portion of the inner surface of the storage tank 2 where the lining film L is formed. This is because the lining film L according to this embodiment has high abrasion resistance and high chemical resistance.

[0014] During operation of the facility, the inner surface of the storage tank 2 is rubbed against the PKS and is subjected to strong shearing force. This is because the PKS stored in the storage tank 2 is moved toward the bottom 23 of the storage tank 2 by a device such as the screw-type dispensing device 3. In particular, the lower region of the inner surface 21a where the PKS is stored is subjected to strong shearing force.

[0015] In addition to the above, when wetting water containing PKS is present, the inner surface of the storage tank 2 has a weakly acidic environment. The wetting water containing PKS is generated by spraying water onto the PKS by the water spray unit 4 or the like.

[0016] The PKS stored in the storage tank 2 is used, for example, as fuel for biomass power generation. The PKS is crushed to about 5 to 15 mm and stored in the storage tank 2. The wet water containing the PKS is acidic, so that the general steel plate constituting the storage tank 2 may oxidize.

[0017] A specific example of the configuration of the storage tank 2 is shown below. Of the inner surface of the storage tank 2, the region of the inner surface 21a of the side wall 21 below a predetermined height (e.g., 500 mm) and the inner surface 23a of the bottom 23 are made of stainless steel plate (SUS). Of the inner surface of the storage tank 2, the other region is made of rolled steel plate. In such a configuration, the stainless steel plate and the nearby rolled steel plate may be electrically connected by wet water. In this case, a corrosion phenomenon called galvanic corrosion may occur, with the stainless steel plate as the cathode and the rolled steel plate as the anode. The lining film L suppresses the above corrosion phenomenon.

[0018] (Lining membrane) The lining film L is formed on the inner surface of the storage tank 2. The lining film L contains at least inorganic particles and a resin. The lining film L imparts preferable abrasion resistance and chemical resistance to the inner surface of the storage tank 2, thereby suppressing corrosion of the inner surface of the storage tank 2. The lining film L is formed on the inner surface of the storage tank 2 by painting a lining material.

[0019] The lining film L may be composed of a plurality of layers including a primer layer and a topcoat layer. The total thickness of the lining film L is preferably 1.0 mm or more, and more preferably 2.0 mm or more.

[0020] There is no particular limitation on the location of the lining film L on the inner surface of the storage tank 2. When the inner surface of the storage tank 2 is formed including a general steel plate and a stainless steel plate as described above, it is preferable to form the lining film L over at least the entire surface of the general steel plate, the entire surface of the portion that contacts the stored PKS.

[0021] In addition to the above, the lining film L may be formed at least in a lower region of the inner surface 21a of the side wall 21. This is because the lower region of the inner surface 21a is subject to abrasion with the PKS and comes into contact with the wet water containing the PKS. The lower region means, for example, a region of the inner surface 21a that is at a predetermined height from the bottom 23.

[0022] The inorganic particles improve the wear resistance of the lining film L by being contained in the lining film L. The inorganic particles are preferably at least one of ceramic particles and glass particles, and more preferably contain ceramic particles. In this specification, "particles" includes granular and flaky shapes. The ceramic particles and glass particles are not particularly limited, and known materials can be used. The ceramic particles and glass particles may be used alone or in combination of two or more kinds. The ceramic particles are not particularly limited, but for example, those with a particle size of 20 to 200 μm can be used. The glass particles are not particularly limited, but for example, glass flakes with a thickness of 2 to 10 μm and a particle size of 10 to 150 μm can be used.

[0023] When the lining film L is made up of multiple layers, it is preferable that any one of the layers contains inorganic particles. It is preferable that the inorganic particles are contained at least in the outermost layer (top coat) or the layer second from the outermost layer. When the lining film L is made up of multiple layers, there may be a layer that does not contain inorganic particles. Each of the multiple layers may contain different types of inorganic particles.

[0024] The inorganic particles are preferably contained in a single layer in an amount of 20 to 85% by mass in terms of solid content, and more preferably in an amount of 30 to 70% by mass.

[0025] As the resin, known resins contained in lining materials, such as vinyl ester resin, unsaturated polyester resin, urethane resin, epoxy resin, etc., can be used. The resin is preferably a vinyl ester resin. By containing the vinyl ester resin in the lining film L, the chemical resistance of the lining film L can be preferably improved.

[0026] The resin can be obtained by polymerizing a composition containing a prepolymer component and a known crosslinking agent.

[0027] The vinyl ester resin is obtained by the reaction of an epoxy resin with an unsaturated monobasic acid. The epoxy resin is not particularly limited, but may be, for example, a bisphenol type epoxy resin such as a bisphenol A type epoxy resin or a bisphenol F type epoxy resin, a novolac type epoxy resin such as a phenol novolac type epoxy resin or a cresol novolac type epoxy resin, a glycidyl ether, an alicyclic epoxy resin, or a glycidyl ester. These epoxy resins may be used alone or in combination of two or more.

[0028] The unsaturated monobasic acid is not particularly limited, but examples thereof include acrylic acid, methacrylic acid, crotonic acid, cinnamic acid, acrylic acid dimer, monomethyl maleate, monomethyl fumarate, monocyclohexyl fumarate, sorbic acid, etc. These unsaturated monobasic acids may be used alone or in combination of two or more kinds.

[0029] The lining film L may contain other known components in addition to those described above, as long as the effects of the present invention are not impaired. For example, it may contain a thickener, a colorant, a plasticizer, a filler, a flame retardant, etc.

[0030] (Screw type dispenser) The screw type dispensing device 3 is a device that dispenses the stored PKS to the dispensing outlet 23b formed in the bottom 23. As shown in FIG. 1, the screw type dispensing device 3 has a screw 31. The screw 31 is a cantilever screw that extends horizontally along the bottom 23. The screw 31 has blades that extend continuously in a spiral shape, and moves the PKS to the center of the bottom 23 by rotating. The screw 31 is configured to be rotatable horizontally. The screw 31 has a base end at the center of the bottom 23, extends horizontally along the bottom 23 with a small gap therebetween, and its tip reaches near the side wall 21. One or more screws 31 are provided.

[0031] A hopper 5 is provided below the dispensing outlet 23b. The PKS are transported by a conveyor 6 disposed below the hopper 5. The configurations of the hopper 5 and the conveyor 6 are not particularly limited, and known configurations can be applied.

[0032] (Watering section) The sprinkler unit 4 prevents dust generation by sprinkling water on the PKS stored in the tank 2. A known sprinkler device composed of a water supply channel, a nozzle, a water amount adjustment valve, etc. can be used as the sprinkler unit 4. The sprinkler unit 4 may sprinkle water in droplets or continuously. The position from which the sprinkler unit 4 sprinkles water on the PKS is not particularly limited. In this embodiment, the sprinkler unit 4 sprinkles water on the PKS from the inner surface 22a of the ceiling 22 of the tank 2.

[0033] The silo apparatus 1 may include configurations of known silo apparatuses other than those described above, as long as the effects of the present invention are not impaired.

[0034] <Silo equipment repair method> The repair method for a silo equipment according to this embodiment is a method for imparting preferable abrasion resistance and chemical resistance to the inner surface of the storage tank 2. The repair method includes a coating process for coating the inner surface of the storage tank 2 with a lining material. The repair method may include a surface preparation process, a drying process, and the like in addition to the above.

[0035] (Surface preparation process) The surface preparation process is a process of performing surface preparation on the areas of the inner surface of the storage tank 2 where the lining material is to be applied in the painting process. The surface preparation process can increase the adhesion between the lining film and the inner surface of the storage tank 2. The surface preparation process is performed, for example, by cleaning the areas to be painted and then sanding them using a known grinding machine or abrasive (sandblasting device, electric sander, sandpaper, etc.). If a deteriorated anticorrosive coating film, rust, etc. is present in the areas to be painted, the surface preparation process may include a process of removing the anticorrosive coating film, rust, etc.

[0036] (Painting process) The painting process is a process of applying a lining material to the painting area where the above-mentioned base treatment has been performed. The lining material is a composition containing at least the inorganic particles contained in the above-mentioned lining film and the above-mentioned resin. The lining material may contain, in addition to the above, a solvent such as water or a solvent, a thermal polymerization initiator, a photopolymerization initiator, etc. The lining material is applied to the painting area using a known application tool (spray, brush, roller, etc.).

[0037] (drying process) The drying step is a step of drying and curing the applied lining material to form a lining film. The drying step can be performed by leaving the applied lining material at a predetermined temperature for a predetermined time. In addition, in the case where the resin composition contained in the lining material has photocurability, the applied lining material may be irradiated with light instead of or in addition to the drying step. The light irradiation can be performed by a known UV irradiation device or the like.

[0038] When the lining film is formed as a film consisting of multiple layers, the above-mentioned coating step and drying step can be repeated multiple times to form a lining film consisting of multiple layers.

[0039] <Silo Equipment Manufacturing Method> The manufacturing method for the silo equipment can be the same as the known manufacturing method for the silo equipment, except that it has a painting process of painting a lining material on the inner surface of the storage tank 2, similar to the above-mentioned silo equipment repair method.

[0040] The present invention is not limited to the above-described embodiment, and the present invention includes modifications and improvements within the scope that can achieve the object of the present invention. EXAMPLES

[0041] Next, an embodiment of the present invention will be described, but the present invention is not limited to this embodiment.

[0042] (Preparation of lining material) <Example 1> The lining material (composition) for forming the lining film was mixed so that the composition of each component of the lining film was in the ratio shown in Table 1 below. The lining material contains a solvent in addition to the components shown in Table 1. The lining film has four layers, with the first layer shown in Table 1 being the layer on the inner surface side of the storage tank and the fourth layer being the layer on the surface side. The glass flakes shown in Table 1 had a thickness of 2 to 10 μm and a particle size of 10 to 150 μm. The ceramic particles shown in Table 1 had a particle size of 20 to 200 μm.

[0043] (Lining material painting) The lining materials prepared above were applied to the inner surface of the tank of an actual silo equipment in operation that stores PKS. Prior to applying the lining materials, the inner surface of the tank was subjected to surface treatment. The surface treatment was blast treatment (ISO Sa2 1 / 2). After the surface treatment, the inner surface of the tank was painted with each lining material to form each lining film with the film thickness shown in Table 1. The coating area was a range of 1500 mm high x 560 mm wide, with the lower end located 200 mm high from the bottom 23.

[0044] [Table 1]

[0045] <Example 2> A lining film according to Example 2 was formed in the same manner as in Example 1, except that the components contained in the lining film and the film thickness were as shown in Table 1.

[0046] <Comparative Example 1> A coating film according to Comparative Example 1 was formed in the same manner as in Example 1, except that an epoxy-based paint shown in Table 1 was used instead of the lining film, and a coating film was formed to the thickness shown in Table 1.

[0047] (evaluation) The silo equipment coated with the above lining film was put into operation, and the following evaluations were carried out approximately 3.5 months after painting (first investigation) and approximately 8.5 months after painting (second investigation). Measurement and evaluation points were 15 points in the vertical direction and 4 points in the horizontal direction within the above painted area, for a total of 60 points.

[0048] [Membrane wear measurement] The thickness of the films in each of the Examples and Comparative Examples was measured using an electromagnetic thickness meter SWT-9300 (manufactured by Sanko Electronics Laboratory). In each of the first and second investigations, the residual rate of the film was calculated by comparing the initial value with the measured value. The average value of five measurements was calculated for each of the above measurement points. Furthermore, the average value in the height direction was calculated, and the results are shown in Tables 2 to 4.

[0049] [Table 2]

[0050] [Table 3]

[0051] [Table 4]

[0052] From the results shown in Tables 2 to 4, it is clear that the lining films of each Example have a lower rate of film wear compared to the coating film of Comparative Example 1, and are able to impart desirable abrasion resistance to the inner surface of the storage tank.

[0053] [Visual inspection of membrane appearance] In the second examination, the appearance of the films according to each of the examples and comparative examples was visually evaluated for "cracks," "peeling," and "blisters" according to the following evaluation criteria. The results are shown in Table 5. 4: No cracks, peeling, or swelling are observed 3: Cracks, peeling, and swelling are partially observed 2: Cracking, peeling, and swelling are observed all over the surface. 1: The membrane has peeled off and disappeared, making it impossible to evaluate.

[0054] [Table 5]

[0055] From the results shown in Table 5, it is clear that the lining films of each Example hardly experienced phenomena such as "cracking," "peeling," and "blistering" compared to the coating film of Comparative Example 1, and were able to maintain favorable chemical resistance.

[0056] Preferred embodiments of the present invention are described below.

[0057] [1] A silo apparatus for storing palm shells, the silo apparatus having a storage tank for storing the palm shells, the silo apparatus having a lining membrane on an inner surface of the storage tank.

[0058] [2] The silo equipment described in [1], wherein the lining membrane contains ceramic particles.

[0059] [3] The silo apparatus described in [1] or [2], wherein the silo apparatus has a horizontally rotatable screw arranged at the bottom of the storage tank.

[0060] [4] The silo apparatus according to any one of [1] to [3], further comprising a sprinkling section that sprinkles water on the palm shells stored in the storage tank.

[0061] [5] A method for repairing a silo equipment that stores palm shells, the silo equipment having a storage tank for storing palm shells, the method comprising a painting process of painting a lining material onto an inner surface of the storage tank.

[0062] [6] The method for repairing a silo equipment described in [5], wherein the lining material contains ceramic particles. [Explanation of symbols]

[0063] 1 Silo equipment 2 storage tank 31 Screw 4. Watering section L Lining membrane

Claims

1. A silo apparatus for storing palm shells, The silo device has a storage tank for storing palm shells, A silo apparatus having a lining membrane on the inner surface of the storage tank.

2. The silo apparatus of claim 1 , wherein the lining membrane comprises ceramic particles.

3. The silo apparatus according to claim 1 or 2, further comprising a horizontally rotatable screw disposed at the bottom of the storage tank.

4. The silo apparatus according to claim 1 or 2, further comprising a sprinkling unit that sprinkles water on the palm shells stored in the storage tank.

5. A method for repairing a silo apparatus for storing palm shells, comprising: The silo device has a storage tank for storing palm shells, A method for repairing a silo equipment, comprising a coating step of coating the inner surface of the storage tank with a lining material.

6. The method of repairing a silo facility according to claim 5 , wherein the lining material comprises ceramic particles.

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