JPS596949A - Fluid energy mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a nozzle is provided in the pulverizing chamber, and a high-pressure fluid is injected into the pulverizing chamber so that the object to be pulverized, such as coal, sandstone, or resin, is pulverized using injection energy. This invention relates to a fluid energy mill in which the supply channels of the fluid are connected in communication.

Conventionally, this type of fluid energy mill, such as the one described in Japanese Utility Model Application Publication No. 100374/1983, adds the material to be pulverized to the injection port of a Laval tube equipped with a nozzle function. According to Japanese Patent Publication No. 45-9306, the object to be crushed is collided with a collision plate such as a wall together with high-pressure fluid injected from a nozzle at high speed, and the object to be crushed is crushed by the impact force at the time of collision. As shown in the description, a supply path for the material to be crushed is provided at the ejection port of each of a plurality of nozzles, and the fluid jetted from the nozzles causes the materials to be crushed to collide with each other, and the impact force causes the materials to be crushed to be crushed. There was something that would crush it.

However, in both the above-mentioned type of crushing by colliding with a collision plate and the type of crushing by colliding the objects to be crushed with each other, the actual crushing efficiency is much lower than the calculated crushing efficiency. In particular, it takes a long time to crush objects to be crushed, such as coal and silica stone.

In view of the points mentioned in IrJ, an object of the present invention is to investigate the cause of the conventional drawbacks and to make it possible to significantly improve the pulverization efficiency.

That is, conventionally, it has been thought that the maximum kinetic energy can be imparted to the object to be crushed by supplying the object to be crushed near the jetting port of the nozzle where the high-pressure fluid is at its highest speed. However, as a result of study, it was found that in places where the fluid is injected as a jet stream at high speed, the material to be crushed is bounced off the periphery of the jet stream and cannot enter the jet stream. Those that eject the material to be crushed into the crushing chamber at a low speed and collide with the collision plate;
Furthermore, they have discovered that in any method in which the objects to be pulverized collide with each other, the impact force is small and sufficient pulverization cannot be achieved.

The present invention has focused on the above fact, and in order to achieve the above object, in the above-mentioned fluid energy mill, a supply path for the material to be crushed is connected to a part of the fluid supply path that is remote from the nozzle. A mixing device for uniformly mixing the material to be crushed into the fluid, which is provided with a stirring section that rapidly increases the cross-sectional area of the flow path between the nozzle and the supply line from the supply path for the material to be crushed. It is characterized by forming a run-up flow path.

In other words, a run-up flow path for mixing is formed before the nozzle accelerates the material to a high speed, and the material to be pulverized is supplied into the fluid flowing at a lower speed than the nozzle injection point. (Also, even if the fluid is supplied biased towards the periphery of the fluid, as the fluid flows into the agitation part in a mixed state with the material to be crushed, it will suddenly The materials to be crushed are mixed and stirred together in a state of stalling, and as a result, a well-uniform mixed state can be achieved in the run-up flow path, and in this mixed state, the nozzle accelerates and injects it into the grinding chamber, so that high-pressure fluid By applying sufficient kinetic energy to the material to be crushed, it can be injected into the crushing chamber, and a large impact force can be obtained whether the material is collided with the collision plate or the materials to be crushed are collided with each other. Efficiency can now be significantly improved.

Therefore, even materials to be crushed such as coal, silica stone, limestone, etc. can be pulverized well and quickly and pulverized, and the pulverized materials can now be used extremely well for various purposes.

Next, embodiments of the present invention will be described based on illustrative drawings.

A gauging (4) for forming a rotating crushing and classification chamber (2) is attached to the cylindrical part (3) provided on the base il+,
Four nozzles (5) are installed in the circumferential direction of the crushing and classification chamber (2).
in a state where they are distributed and arranged with a phase difference of 0°, and
With the injection, the material to be crushed and the fluid flow into the crushing and classification chamber (2)
A recovery path (7) for taking out fine powder is connected to the crushing and classification chamber (2), so that the fluid and its The dispersed and mixed materials to be crushed are supplied into the crushing and classification chamber (2) from the respective nozzles (5), and the materials to be crushed are separated from each other or the materials to be crushed in the crushing and classifying chamber (2). The pulverization and classification chamber (2) is configured to perform pulverization by collision with the inner wall, and the material to be pulverized from the pulverization section is pulverized by the action of fluid transport force and centrifugal force within the pulverization and classification chamber (2). It is configured so that it can be separated into coarse powder and coarse powder, and it is configured so that only the fine powder can be taken out through the recovery path (7).

The cylindrical part (
3) is attached and supported via the support arm (6), and an appropriate high-pressure fluid supply device (9) such as a compressor is connected to the annular flow path (8) by a fluid supply pipe (1o), and the nozzle (6) and the annular flow path +8+ (!:) to the communicating pipe (1
11 to form a fluid supply path (R1). Then, the fluid supply pipe +101 is connected to an annular flow path (8).
The fluid outlet (lla) to each of the communication pipes 01) is opened toward the other side in the circumferential direction relative to the annular flow path (8), In addition, the raw material hopper (121) that supplies the material to be crushed, such as fine or relatively fine coal that has been crushed in advance, is connected to the raw material hopper (121) through a closed-type quantitative feeding device such as a rotary feeder that can freely adjust the supply amount. Fluid supply pipe (101
A mixing device is used to uniformly mix the material to be crushed into the fluid from the supply device (1) to the nozzle (5) via the annular flow path (8) and the communication pipe 11D... A run-up flow path is formed, and an appropriate amount of the material to be crushed and fluid that are continuously or continuously supplied are injected in a mixed state from the fluid supply pipe (lO) into the annular flow path (8). , so that the material to be crushed is evenly dispersed in the fluid by the flow in the annular channel (8), and the fluid containing the material to be crushed at an appropriate concentration is supplied to the nozzle (5). It is.

! An annular flow path (8) is provided in the middle of the mixed description run-up flow path described in II, and the run-up flow path is configured to be sufficiently long considering the space, and the pipe (8)
a) is made to have a large diameter to constitute a stirring part.1 As the pulverized material is supplied to the annular channel (8) in a mixed state with the fluid, it stalls there and is stirred. In order to obtain an even better mixed state, f1η is used.

A suitable solid-gas separator such as a cyclone (141) and a suitable fluid suction/discharge device (15) such as a blower pump on the F flow side are connected to the recovery path (7), and the pulverized fine powder is removed from the fluid. It is constructed so that it can be separated and recovered.

In the above embodiment, the flow path of four communication pipes (1'')...
The total area is configured to be smaller than the flow path cross-sectional area of the pipe (8a), and the fluid is accelerated from the annular flow path (8) to the communication pipe (II) in a mixed state with the material to be crushed. However, in the present invention, the communication pipe ll...
The nozzle (5) may be configured to accelerate only the odor -C.

The object to be pulverized may be anything from a high specific gravity such as coal, resin, sandstone, and ceramics to a low specific gravity, and the fluid to be used may be air, steam, etc. Although it is common, an example is low-temperature grinding f! r
: When attacking, use fluid nitrogen or carbon dioxide, etc.
Various changes are possible.

Next, another example will be described.

(B) As shown in Fig. 3, a concave-shaped spiral flow path (81f) is formed coaxially with IfJ annular flow path), and the fluid mixed with the material to be crushed is further passed through the spiral flow path. It may be configured such that the mixture is allowed to pass therethrough and then supplied to the annular flow path (8), thereby forming a longer run-up flow path for mixing while reducing the installation space.

(b) A stirrer such as a spiral (C1) may be provided in the spiral flow path FBI to actively mix the fluid and the material to be crushed. In this case, the stirrer ( C1 is not limited to a spiral body, but may be one in which a number of baffle plates each having a torch are provided in the spiral flow path iB1.

(c) Directly connect the nozzle (6) to the annular flow path (8).

In order to supply the material to be pulverized to the middle of the fluid supply path 1tt+, various means such as a screw feeder can be used, limited to those consisting of a hopper width and a quantitative supply device 113), and connected to the fluid supply path (R). This is referred to as the processing object supply path trl. One of the features of the present invention is that -C enables the pulverization of the material to be pulverized, and particularly improves combustion efficiency.
It is possible to efficiently obtain fine coal powder that is mixed into fuel oil in order to prevent it from burning, and is extremely useful in practice.

[Brief explanation of drawings]

The drawings show an embodiment of the fluid energy mill according to the present invention. The figure is a flow sheet including a sectional view of the thick section showing another embodiment.

Claims (1)

[Claims] ■ A nozzle (6) is provided in the grinding chamber (2), and a nozzle (6) is provided in the grinding chamber (2).
In a fluid energy mill in which a high-pressure fluid supply path (R1) is connected in communication with a J period nozzle (6), the fluid supply path (R
), a supply path fr+ of the material to be crushed is connected to a point away from the nozzle (5), and a supply path fr+ of the material to be crushed is connected between the nozzle (5) and the supply path frl of the material to be crushed. , flow path W "disturbance fAl f that rapidly increases the area
A fluid energy mill characterized by forming a mixing run-up flow path for uniformly mixing a material to be crushed into a fluid. (2) The fluid energy mill according to claim 0, wherein the combined run-up passage according to claim 0 includes an annular passage (8). (2) The fluid energy mill according to claim 0 or 0, wherein the nozzles (5) are distributed at a plurality of locations in the circumferential direction of the grinding chamber (2).