JP3088150B2 - Fiber reinforced resin impeller for rotary scrubber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced resin impeller of a rotary scrubber for cleaning and collecting gas containing corrosive gas and fine powder (dust and fume) using a liquid.

[0002]

2. Description of the Related Art In recent years, attention has been paid to global environmental problems, and factory exhaust gas containing corrosive gas and fine powder (dust, fume, etc.) from boilers and incinerators is collected and discharged to the environment. There is a demand for a technology for further purifying the generated gas. A method of using a corrosion-resistant fiber reinforced resin (hereinafter sometimes referred to as FRP) for a scrubber body, an inlet duct, and the like is known from Japanese Patent Publication No. 55-23656.

In order to obtain a high dust collection rate in a rotary scrubber, it is necessary to rotate the impeller at high speed. Because of the heavy weight of the steel impeller, the peripheral speed was low and the collection efficiency was limited. By changing the impeller of the rotary scrubber from steel to glass fiber reinforced resin (hereinafter sometimes referred to as GFRP), the weight can be reduced to about 1/2 and the collection efficiency can be improved. It has been developed in recent years.

[0004]

SUMMARY OF THE INVENTION However, GFR
There was a problem that the life of the P-made impeller was shorter than that of the steel-made impeller due to abrasion by fine particles in exhaust gas. Further, since an impeller made of carbon fiber reinforced resin (hereinafter sometimes referred to as CFRP) has higher strength and rigidity than an impeller made of GFRP, it is expected that the peripheral speed at the limit is large and the collection efficiency is improved. However, with respect to abrasion, CFRP is inferior to GFRP, so there was a further problem in life. An object of the present invention is to provide a fiber reinforced resin impeller that maintains a high dust collection rate and has excellent wear resistance.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a fiber-reinforced resin blade having a fiber-reinforced resin layer made of an inorganic fiber having a specific elastic modulus on its surface. The present inventors have found that a car has excellent wear resistance, and have reached the present invention.

That is, according to the present invention, the impeller body is made of a fiber-reinforced resin, and the surface has an elastic modulus of 15,000 kgf / m2.
The present invention relates to a fiber reinforced resin impeller for a rotary scrubber having a fiber reinforced resin layer made of inorganic fibers of m ² or more. Further, according to the present invention, the elastic modulus of the fiber used for the fiber-reinforced resin of the impeller body is 6000 kgf / mm ² or more,
High-strength, high-elasticity fibers with a strength of 150 kgf / mm ² or more are used in a volume ratio of at least 10%
The present invention relates to a fiber reinforced resin impeller for a rotary scrubber, which contains 0% or less.

[0007] The shape of the fiber reinforced resin impeller for a rotary scrubber is as shown in FIGS. 1 to 6. If necessary, these impellers can be used in several layers. FIGS. 1, 3, and 5 are plan views of the impeller (half of the impeller is shown in the drawings), and FIGS. 2, 4, and 6 are corresponding cross-sectional views. Corrosive gas or gas containing fine powder flows in from the top in each sectional view,
Pass through the main plate, side plate and blades to the side and go to the next impeller.

In order to improve the wear resistance of the impeller and prolong its life, the surface of the FRP impeller body has an elastic modulus of 150.
It is preferable to provide a fiber reinforced resin layer made of an inorganic fiber of 00 kgf / mm ² or more. Examples of the inorganic fibers include alumina fibers and silicon carbide fibers.

The alumina fiber used in the present invention has an elastic modulus of at least twice that of a general glass fiber and has extremely good adhesion to a synthetic resin. This makes it possible to easily produce an excellent composite material. The alumina fiber is alumina (Al ₂ O ₃ )
Those having a content of 60% by weight or more are preferred. More preferably, the alumina content is 72% by weight or more, and silica (SiO
₂ ) Those having a content of 28% or less are preferred, and particularly preferred are an alumina content of 75 to 98% by weight and a silica content of 25 to 2%.
% By weight is preferred. If the alumina content is less than 60% by weight, the fiber elastic modulus is not sufficient, and if the alumina content is 98% or more, the elastic modulus becomes too large, and handleability and moldability deteriorate.

In the X-ray structure of the alumina fiber, it is preferable that the fiber does not substantially exhibit the reflection of α-alumina. In general, inorganic fibers grow in the fiber at a high temperature, and crystal grains of an inorganic substance forming the fiber grow, and the fiber strength is remarkably reduced due to the destruction of grain boundaries between these crystal particles. At the same time, the surface area of the fiber decreases with the growth of the crystal grains, and therefore, the adhesion to the resin decreases. It is generally known that this situation is characterized by the appearance of α-alumina reflection in the X-ray diffraction image of the alumina fiber. Therefore, the alumina fiber used in the present invention is preferably manufactured so that the reflection of α-alumina does not appear in the X-ray diffraction image.

Examples of the alumina fibers include Altex (trade name, manufactured by Sumitomo Chemical Co., Ltd.), Arsen (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.), Nextel R (trade name, manufactured by 3M),
Product name Almax (Mitsui Mining Co., Ltd.), Product name FP
Fiber (manufactured by DuPont) and the like can be mentioned. Preferred fibers among these are Artex and Arsen.

The silicon carbide fiber used in the present invention is manufactured by Nicalon (trade name, manufactured by Nippon Carbon Co., Ltd.) manufactured by a polycarbosilane firing method, and manufactured by a CVD method (chemical vapor deposition method) on a carbon core wire. Textron Specialty Materials (Texstr)
on Specialty Materials) and has an elastic modulus twice or more that of general glass fiber.

The form of the inorganic fiber used in the present invention is not particularly limited, and it may be a long fiber or a short fiber. However, it is preferable to use a long fiber because the high strength characteristics can be obtained. In the case of long fibers, they can be used in the form of roving, woven cloth or prepreg. Regardless of the shape used, the inorganic fiber reinforced resin layer is preferably formed on the FRP impeller body while the resin is impregnated with the inorganic fiber by the hand lay-up method.

The thickness of the inorganic fiber reinforced resin layer is preferably at least 50 μm or more. More preferably 100
２０００2000 μm is preferred, and particularly preferably 100-100
0 μm is preferred. If it is less than 100 μm, the effect of improving the wear resistance is small, and if it is more than 2000 μm, it is not preferable in terms of cost and weight. The inorganic fiber reinforced resin layer is preferably formed on the entire surface of the impeller, but may be formed only in places where wear is severe depending on the use conditions.

Further, adding ceramic powder to the resin, and coating and using a powder-dispersed resin further containing ceramic powder on the inorganic fiber reinforced resin layer, results in a further increase in wear resistance. Is preferred. Ceramic powder includes alumina, zirconia,
Powders having a Mohs hardness of 7 or more such as silicon carbide and titanium diboride, or solid lubricating powders such as graphite and molybdenum disulfide can be used. These powders can be used as a mixture of two or more kinds. The amount of the ceramic powder is preferably 20 to 50 g per 100 g of the resin.

The matrix resin of the inorganic fiber reinforced resin on the FRP impeller body and the powder reinforced resin containing the ceramic powder to be further coated thereon may be epoxy resin, unsaturated polyester resin, vinyl ester, or the like. Resin, urethane resin, phenol resin, alkyd resin, xylene resin, melamine resin, thermosetting resin such as silicone resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polymethacrylate resin, ABS resin, fluorine resin, polycarbonate resin, Polyester resin, polyamide resin (nylon 6, 6.6, 6.10, 6.11, 6.12, etc.), polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, polyether ether ketone resin, It can be exemplified thermoplastic resins such as polyphenylene oxide resins. Of these, epoxy resins, unsaturated polyester resins, and vinyl ester resins are preferred from the viewpoint of performance and handleability.

Next, the fiber reinforced resin of the impeller body will be described. Examples of the matrix resin of the fiber reinforced resin include thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, urethane resin, phenol resin, alkyd resin, xylene resin, melamine resin, furan resin, silicone resin, and polyethylene. Resin, polypropylene resin, polyvinyl chloride resin, polymethacrylate resin, ABS resin, fluorine resin, polycarbonate resin, polyester resin, polyamide resin (nylon 6, 6.6, 6.10, 6.11, 6.12, etc.), Polyphenylene sulfide resin, polysulfone resin,
Thermoplastic resins such as polyethersulfone resin, polyetheretherketone resin, and polyphenylene oxide resin can be used. Among these epoxy resins,
Unsaturated polyester resins and vinyl ester resins are preferred in terms of performance and handleability.

Examples of the reinforcing fibers of the fiber-reinforced resin of the impeller body, the elastic modulus of the fiber 6000kgf / mm ² or more, the fiber is strength of 150 kgf / mm ² or more, 10% or more of the total fiber-reinforced resin in a volume ratio It is desirable to contain 70% or less. More preferably, 30 volume% or more, 65
% By volume or less is preferred. If it is less than 10% by volume, the reinforcing effect is not sufficient, and if it is more than 70% by volume, the probability of contact between the fibers becomes large, and the strength is undesirably reduced.

More preferably, the elastic modulus of the fiber is 150
00 kgf / mm ² or more, strength 200 kgf / mm ²
The above fibers are used in a volume ratio of 30% of the entire fiber reinforced resin.
% To 65%. Elastic modulus is 600
Less than 0 kgf / mm ² and strength is 150 kgf / mm ²
If it is less than 1, the high-speed rotation cannot be expected because the rigidity of the entire impeller is reduced, and under a large inertial force, cracks occur between the inorganic fiber layer and the main body, which is not preferable.

Specific examples of the reinforcing fiber include at least one fiber selected from the group consisting of carbon fiber, glass fiber, aramid fiber, alumina fiber, and silicon carbide fiber. As the alumina fiber and the silicon carbide fiber, those described above are exemplified.
Of these, glass fibers are preferred because of their low cost. In addition, carbon fibers are preferred because the higher the specific strength and specific rigidity, the more remarkable the effect of lightening / high-speed rotation and a high dust collection rate. It is also preferable to use a combination of two or more of these fibers according to the purpose. For example, the hybrid use of carbon fiber and glass fiber is preferable in terms of balance between performance and cost.

The method for manufacturing the impeller body of the fiber-reinforced resin scrubber in the present invention can be manufactured by a hand lay-up method, a press molding method, an autoclave molding method, or the like. Generally, the impeller has many complicated shapes, so the hand lay-up method is preferable.

In order to reduce molding defects, it is also preferable to increase the fiber content by increasing the volume content of the reinforcing fibers in the FRP to 30% or more, performing hand lay-up molding, and then placing the fibers in a vacuum bag to eliminate voids. . In order to reduce molding defects, an impeller is manufactured in advance by press molding, autoclave molding, etc., and this is used as a core, and a wear-resistant fiber-reinforced resin layer is formed on the surface by hand lay-up. However, a method of assembling into a predetermined three-dimensional shape is also preferable.

[0023]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. Abrasion test method for FRP Abrasion test was performed under the following conditions according to JIS K7204. Testing machine: Taber abrasion tester (TA, manufactured by Yasuda Seiki Seisaku-sho, TA
(BER ABRASER) Wear ring: CS-17 Load: 1000g Number of rotations: 1000

Example 1 The laminated structure of the test piece was made of woven alumina fiber (Al) +
Surface mat (S) +5 layers of chopped strand mat (C) + surface mat (S) + alumina fiber woven fabric (Al) (hereinafter abbreviated as (Al + S + 5C + S + Al)), and in any layer, bisphenol-based matrix resin Vinyl ester (manufactured by Showa Polymer Co., Ltd.) was used. Test pieces were prepared by the hand lay-up method so that the fiber volume content (Vf) became 30%, and a wear test was performed. Table 1 shows the results.

The details of the materials used are described below. Surface mat: Microglass surface mat (product code CFG24) manufactured by Nippon Sheet Glass Co., Ltd., fiber weight 30 g / m ² , fiber content after molding 10 vol%,
Thickness: 120 μm, density: 1.34 Chopped strand mat: Nippon Sheet Glass Co., Ltd. chopped strand mat (product code REM380-G)
5 (polyester binder)), fiber length about 50m
m, fiber weight 380 g / m ² , fiber content after molding 30
Volume%, thickness 490 μm, density 1.61 Alumina fiber woven fabric: Sumitomo Chemical Co., Ltd. alumina fiber Artex, plain weave, 1000 filaments / yarn,
Fiber elastic modulus 21000kgf / mm ² , fiber diameter 15μ
m, fiber weight 510 g / m ² , fiber content after molding 4
0 volume%, thickness 375 μm, density 2.41 The results are shown in Table 1.

Example 2 A matrix resin was filled with SiC powder having a particle size of about 10 μm and used.
Example 1 except that the ratio was 30 g with respect to 0 g.
A test piece was prepared in accordance with the above and a wear test was performed.

Comparative Example 1 The laminated structure of the test pieces was changed to a surface mat (S).
A test piece was prepared in accordance with Example 1 and subjected to a wear test, except that +5 layers of chopped strand mat (C) + surface mat (S) (hereinafter abbreviated as (S + 5C + S)). Table 1 shows the results.

[0028]

[Table 1] The abrasion ratio in the table is set to 100 in Comparative Example 1.

Embodiment 3 FIGS. 1 and 2 show a scrubber impeller for treating ammonia waste gas. The diameter of the impeller was 850 mm, the thickness of the blade, the main plate, and the side plate was 10 mm, and 24 blades were mounted on the circumference. The rotation speed at the time of use is variable by the inverter.
It was 20-1200 rpm. The main and side plates of the impeller,
The blades are made of a glass fiber roving cloth (Micro Glass Roving Cloth, manufactured by Nippon Sheet Glass Co., Ltd., product code REW810-M, plain weave, fiber weight 810 g / m ² ,
After molding, a fiber content of 45% by volume, a thickness of 700 μm, a density of 1.82) and chopped strands are alternately laminated in seven layers, one surface mat on the outside, and two layers of alumina fiber woven fabric on the surface layer. It was prepared by a hand lay-up method using a vinyl ester resin as a matrix. The same material as in Example 1 was used except for the glass fiber roving cloth. When this impeller was used by attaching it to a rotary scrubber of an ammonia exhaust gas treatment test plant, even after one year, only a few 10 μm of the surface resin was worn, and there was no problem in use.

The operating conditions of the test plant were as follows. Inlet ammonia gas concentration 12000ppm Temperature 150 ° C Air flow 10M ³ / min Dust collection efficiency 99% or more Outlet ammonia gas concentration 1ppm or less Treatment liquid Dilute sulfuric acid

Comparative Example 2 An impeller for a rotary scrubber was prepared in the same manner as in Example 3 except that the surface alumina fiber woven fabric was not used, and the same operation as in Example 3 was performed. In addition, the thickness of the blade was reduced to less than half in most parts due to abrasion, and the blade could not be used.

Embodiment 4 FIGS. 1 and 2 show a scrubber impeller for boiler waste gas treatment. Sumitomo Hercules CFR for main plate, side plate and blades
P prepreg [Carbon fiber magmanite (trade name) AS4
(Elastic modulus 24000 kgf / mm ² ) / epoxy resin 1
908] to obtain a pseudo isotropic [0 ° / ± 45 ° / 90 °
°] and press-molded by curing at 120 ° C., and a plain weave of alumina fiber Artex (elastic modulus 21,000 kgf / mm ² ) manufactured by Sumitomo Chemical Co., Ltd. on the surface and vinyl ester resin (trade name manufactured by Dow Chemical Co., Ltd.) (Delacane) as a matrix by a hand lay-up method. C
Vf of FRP part is 60%, Vf of ALFRP part is 4
0%.

The impeller is mounted on a rotary scrubber of a boiler waste gas treatment plant, and is rotated at high speed (for example, up to 369) for hydrogen chloride and chlorine gas treatment and dust collection.
Long-term operation at 0 rpm and a peripheral speed of 71.5 m / s) is possible.

[0034]

The impeller of the present invention is excellent in abrasion resistance and rigidity, so that it can be rotated at a high speed (for example, at a peripheral speed of about 40 m).
/ S or more, up to about 70 m / s) for long-term operation and a high dust collection rate. In addition, since the number of impellers mounted on one machine can be reduced, the production cost of the scrubber can be reduced, and there is an energy saving effect during operation. Furthermore, the structure of the impeller of the present invention can be widely applied to gas blowers, fans, and the like.

[Brief description of the drawings]

FIG. 1 shows a plan view of a scrubber impeller.

FIG. 2 shows a cross-sectional view of a scrubber impeller.

FIG. 3 shows a plan view of a scrubber impeller.

FIG. 4 shows a cross-sectional view of a scrubber impeller.

FIG. 5 shows a plan view of a scrubber impeller.

FIG. 6 shows a cross-sectional view of a scrubber impeller.

[Explanation of symbols]

 1 main plate 2 side plate 3 blade

Claims (2)

(57) [Claims] 1. An impeller made of a fiber-reinforced resin for a rotary scrubber, wherein the impeller body is made of a fiber-reinforced resin and a surface thereof has a fiber-reinforced resin layer made of an inorganic fiber having an elastic modulus of 15000 kgf / mm ² or more. 2. The fiber used for the fiber reinforced resin of the impeller body has an elastic modulus of 6000 kgf / mm ² or more and a strength of 15 or more.
A high-strength, high-elastic fiber of 0 kgf / mm ² or more,
The impeller made of fiber-reinforced resin for a rotary scrubber according to claim 1, wherein the impregnator contains 10% or more and 70% or less of the entire fiber-reinforced resin by volume ratio.