JPH10290937A - Disintegrator used for producing coal-ash hardened grain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disintegrator for disintegrating a lump one by one grain generated in the case of producing a coal-ash hardened grain without generating of cracking or powdering of the grain. SOLUTION: A hardener such as cement is added to the coal ash as a raw material generated from a pulverised coal-fired boiler and the admixture is granulated, aged and hardened to obtain a hardened grain 1 which is supplied to a four-shaft toothed roll crusher 2 and disintegrated. The diameter of a first-stage roll 3 in the crusher 2 is made to 1/3 to 1/2 of the maximum lump size, the clearance between the rolls 3 is made to 1/5 to 1/3 of the maximum lump size, the diameter of a second-stage roll 4 is made to 1.0 to 2.0 times of the clearance between the first-stage rolls 3 and the clearance between the rolls 4 is made to 1/5 to 1/3 of the clearance between the first-stage rolls 3. The hardened grain is then supplied to a two-shaft flat roll crusher 6 and disintegrated. The clearance between the rolls 7 in the two-shaft float roll crusher 6 is made to 1.2 to 1.8 times of the maximum grain diameter of the product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing apparatus used for producing hardened coal ash granules suitable for use as a fluidization inhibitor added to asphalt pavement.

[0002]

2. Description of the Related Art For the purpose of providing as a product for an anti-fluidizing material for asphalt pavement, a soil conditioner, a building material, and the like, a hardening material such as cement is added to coal ash generated from a pulverized coal-fired boiler to granulate and cure. In the process of making hardened particles by the hardening process, nodules are generated by the loading pressure in the curing and hardening step.

[0003] This nodule is formed by rocks formed by the combination of grains and the size thereof depends on the amount of granulated water and the height of the storage layer, but is usually sent to the next step such as drying. It breaks when it is crushed from the storage layer due to
It is about 00 to 500 mm, but in any case, in order to obtain a product, it must be finally crushed into individual grains.

Conventionally, as a means for performing this pulverization, an impact type crusher such as a single roll crusher 13 or a hammer crusher or a jaw crusher as shown in FIG. A screen 14 that separates by size is placed, and a product 15 is placed under the screen.
Return conveyor 16,1 for re-crushing on the net
The method of returning to the former-stage crusher 13 at 7, 18 is adopted. In addition, in FIG. 2, 1 shows the solidified nodule and 12 shows a feed conveyor.

[0005]

In the above-mentioned conventional method, since the nodules are passed several times through the crusher 13 and the screen 14, many cracks and powders occur due to shock and vibration, resulting in poor quality of the product. The yield also worsens.

An object of the present invention is to provide a crushing apparatus capable of crushing agglomerates generated during the production of hardened coal ash particles into individual particles without causing cracking or powdering of the particles. Is an issue.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a process for curing a hardened particle formed by granulation and curing by adding a hardening material such as cement using coal ash generated from a pulverized coal-fired boiler as a raw material. In order to solve the above-mentioned problem in the device for crushing the generated nodules, a crushing device in which a four-shaft toothed roll crusher having the following configuration is arranged at the front stage and a two-shaft roll crusher is arranged at the rear stage is provided.

That is, in the crusher according to the present invention, 1
The roll diameter of the first stage is set to １ ／ to の of the maximum nodule size, and the roll clearance is set to ５〜 to ３ of the maximum nodule size. 0-2.0
Double the roll clearance to 1/5 to 1 of the first stage roll clearance
The roller crusher with a 4-axis tooth set to / 3 is placed at the front stage, and the roll clearance is set to 1.2 to 1.8 of the product maximum particle size.
A configuration in which the doubled two-axis roll crusher is arranged at the subsequent stage is adopted.

[0009] The maximum size of the nodules to be crushed by this crusher is usually about 300 to 500 mm. The shape, height, and arrangement of the teeth of the toothed roll crusher used in the crushing apparatus according to the present invention may be appropriately determined according to the properties of the nodule.

[0010] The crushing apparatus according to the present invention has the above-mentioned structure, and the first roll of the 4-axis toothed roll crusher arranged at the front stage first causes the teeth to bite into the nodules of hardened particles, and the nodules are rolled on the roll surface. Crack the baby boomer while preventing it from escaping and then put the broken baby boomer between the first roll gap and break it below the first roll gap, and the second roll almost breaks the baby boomer with teeth No, it works by splitting it between rolls.

[0011] The hardened coal ash particles and the aggregate thereof partially broken by the former four-shaft toothed roll crusher enter the latter two-shaft roll crusher. Since the latter two-axis roll crusher has a roll clearance of 1.2 to 1.8 times the maximum particle size of the product, it crushes the nodules received in the roll clearance without crushing each hardened particle. Crushed into single grains, and the resulting grains having the final shape are passed through as they are to be crushed without causing crushing of one grain.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a crushing apparatus according to the present invention will be specifically described based on one embodiment shown in FIG.
As seen in FIG. 1, the present apparatus has a four-axis toothed roll crusher 2 disposed at the front stage and a two-axis flat roll crusher 6 disposed at the rear stage. The four-axis toothed roll crusher 2 has a pair of toothed first-stage rolls 3 and a pair of toothed second-stage rolls 4.

On the other hand, the rear-stage two-axis flat roll crusher 6 has a pair of flat rolls 7, and is communicated between the four-axis toothed roll crusher 2 and the rear-stage two-axis flat roll crusher 6 by the transport conveyor 5. ing.

[0014] The nodules generated in the storage layer in the curing and hardening step are broken when they are dislodged from the storage layer and are usually 300 to 50.
Although it is about 0 mm in size, it is first supplied to a 4-shaft toothed roll crusher 2 arranged as a former crusher for coarsely crushing.

In the crusher 2, the diameter of the first-stage roll 3 is set to about 1/3 to 1/2 of the maximum nodule size.
Between 1/5 and 1/3 of the maximum baby boomer size,
The diameter of the second roll 4 is 1.0 to 2.0 times the clearance of the first roll 3, and the clearance between the rolls 4 is 1/5 to 1/1 of the clearance of the first roll 3. 3 is assumed.

Further, the shape, height and arrangement of the teeth are determined by the properties of the nodules and the like, and are not related to the gist of the present invention. May have a height of about 20 to 50 mm.

Next, in the four-axis toothed roll crusher 2, the aggregate is reduced to a size smaller than the clearance of the second-stage roll 4, and the aggregate is reduced to a final shape of the granules. Since the coexisting powder is arranged as a latter-stage crusher, it is guided to the biaxial flat roll crusher 6 and crushed into hardened particles one by one.

In the crusher 6, the diameter of the roll 7 is set to 15 to 20 times the maximum size of the received bulk, and the clearance between the rolls 7 is set to 1.2 to 1.8 times the maximum particle size of the product.

The roll crusher 2 with four-axis teeth in the preceding stage is used.
May be a four-axis toothed roll crusher configured by vertically arranging two crushers provided with two-axis toothed rolls due to installation space or the like.

The nodules generated in the bed of the hardened coal ash grains are formed by rocks formed by the coalescence of grains, and ideally, only the joint surface should be crushed. The compression force or impact force for that purpose does not need to be large enough to crush a block such as natural stone.

For this reason, in the four-axis toothed roll crusher employed in the crushing apparatus according to the present invention, the first-stage roll first digs the teeth into the conglomerate to prevent the conglomerate from slipping and escaping on the surface of the roll. , Then put the cracked nodule in the first-stage roll gap and break it below the first-stage roll gap. The second-stage roll has almost no effect of breaking the nodule with the teeth, and has the effect of sandwiching the roll with the roll. I do.

As described above, the four-axis toothed roller crusher employed in the crushing apparatus according to the present invention does not apply an impact force to the hardened particles, so that the bonding surface of the nodules and the particles is hardly generated. Can be broken.

The two-axis flat roll crusher 6 disposed downstream of the four-axis toothed roller crusher 2 is formed of a lump that has been crushed to be smaller than the gap of the second-stage roll 4 of the four-axis toothed roller crusher 2 and has become smaller. The final form of the granules and the powder that accompanies the crushing coexist, are received in the clearance of the flat roll 7, and the nodules are crushed into one grain by crushing. The granules having the shape can be crushed without causing crushing of one grain by passing the granules as they are.

In the two-axis flat roll crusher 6, small lumps, grains and powder pass through a roll clearance having a maximum particle size of 1.2 to 1.8 times while receiving compressive force. A soft crushing that is less likely to receive a local point pressure due to the direct contact of the lumps with the surface of the flat roll 6, that is, less crushing and pulverization of one grain and more bonding surfaces between grains. The action of crushing occurs.

As described above, according to the present crushing apparatus, the hardened particles are subjected to impact or vibration by passing the nodules several times through a crusher or a screen, as in the conventional device, so that the particles can be broken.
The agglomeration can be broken down into individual grains without causing a lot of pulverization, and as a result, a situation in which the product quality deteriorates and the yield deteriorates. Next, an example of the specifications of the crusher according to the present invention will be described.

(Embodiment 1) Receiving nodule size: 0 to 500 mm, target particle size after crushing: 0 to 2.5 mm, former crusher: type: roll crusher with 4-axis teeth, first-stage roll diameter: 200 mm, First-stage roll clearance; 100 mm, second-stage roll diameter; 150 mm, second-stage roll clearance; 25 mm, rear-stage crusher: Model; 2-axis flat roll crusher, first-stage roll diameter; 600 mm, first-stage roll clearance; 3.5mm,

[0027]

The effect of the use of the crushing apparatus according to the present invention is shown in Table 1 as a change in the particle size distribution of the hardened particles before and after crushing as compared with the conventional method.

[0028]

[Table 1]

Further, in order to see the effect of the crushing apparatus according to the present invention, when the amount of the saucer before and after crushing is evaluated, the conventional method is 6%.
The present invention is an increase of 2.9%, while the powdering is reduced as compared with the conventional method. Further, visual observation of the particles after crushing in the apparatus of the present invention showed almost no sticking of the particles (uncrushed) and cracking of one particle.

As described above, according to the present invention, nodules generated when hardened coal ash particles are produced can be crushed into individual particles without causing cracking or powdering of the particles. A crusher is provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a crusher according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional crusher.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Baby lump 2 4-axis toothed roll crusher 3 First-stage roll 4 Second-stage roll 5 Conveyor 6 2-axis flat roll crusher 7 Flat roll 8 Disintegrated hardened particles

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Kunihisa Fujiwara, Ryomei Giken Co., Ltd., 1-20-24 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima

Claims (1)

[Claims] 1. An apparatus for disintegrating a nodule generated in a step of curing and hardening hardened particles produced by granulation and curing by adding a hardening material such as cement using coal ash generated from a pulverized coal-fired boiler as a raw material. , The first-stage roll diameter is set to 1/3 to 1/2 of the maximum nodule size and the roll clearance is set to 1/5 to 1/3 of the maximum nodule size, and the second-stage roll diameter is set to the first-stage roll clearance A 4-axis toothed roller crusher with a roll clearance of 1.0 to 2.0 times that of the first stage and a roll clearance of 1/5 to 1/3 of the first stage roll clearance is arranged at the front stage. A crusher for producing hardened coal ash particles, characterized in that a twin-screw roll crusher of 1.2 to 1.8 times is arranged in a subsequent stage.