JPS59105810A - Coal flotation machine - Google Patents

Abstract

PURPOSE:To make it possible to reduce the amount of shower water used in a toilet, by mounting a mechanical apparatus for imparting shearing force to air bubbles collected in the toilet and reducing the sizes of air bubbles or crushing the same in the toilet. CONSTITUTION:A rotary cylinder 100 is mounted to a toilet 30 while bars 101 are spirally attached to the surface of said rotary cylinder 100 in a direction sending coal with low ash content and imparts shearing force to air bubbles to be capable of crushing the same or making the same fine. The shape of each bar 101 is formed into a shape for easily imparting shearing force to air bubbles. In addition, the rotary number of the rotary cylinder 100 is adjusted to high speed rotation of 300-1,000rpm and shearing force is effectively imparted to air bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flotation machine used in the deashing process of highly concentrated coal water slurry.

Coal high concentration water slurry means coal concentration 60-85 weight ratio,
Surfactant 0. O1~5゜0 weight% (based on coal powder),
It is a slurry fuel consisting of water with residual water. Coal concentration and surfactant addition rate vary depending on the type of coal. Ordinary coal contains ash, but when combusting a highly concentrated water slurry of coal in a boiler, the presence of ash will reduce boiler efficiency, so it is best to remove as much ash as possible before combustion. preferable.

In addition, adjusting the residual ash content in the coal to the same value for each coal type has the effect of minimizing the calorific value, combustion efficiency Qj, and fluctuations depending on the coal type. With a background like this,
A deashing process for high-concentration coal water slurry using a flotation machine has been known in the past.

The conventional flotation machine used in the deashing process of highly concentrated coal water slurry is explained using Figs. 1 and 2.
In the figure, finely pulverized coal (5υ) is well stirred with a mixture of foaming agent and scavenger (200), and the coal concentration is 10 to 80% by weight. are supplied to cell 1. Cells I, n, Il
1 and IY each have a cross-sectional structure shown in FIG.

Now, in FIG. 2, the mixture (200) of coal 00, foaming agent, and scavenger sent to cell I in the form of a water slurry is sufficiently stirred by the stirring blade (4) shown in FIG.

The hollow shaft (5) that connects the stirring blade (4) and the drive pulley α0) has air Q due to the suction force of the stirring blade (4).
The water enters the water automatically and is blown out into the water in the form of foam by the stirring blade (4). Also rectifier plate (1) (2)
(3) has the role of helping the air bubble α6) to spread efficiently throughout the entire space.

A mixture of foaming agent and scavenger (200) is attached to the gas-liquid boundary of the air bubble αω in the form of a film, and coal particles (17) with a higher carbon content in the coal θυ adhere to the air bubble ( Due to the buoyancy of 1 smell, the coal particles αη rise to the top of the cell.The air bubbles (161 are the electric motor u5
), a collector plate (1) driven by a drive chain (141),
31, it is scraped out by the tray a gong. Then, in order to crush the air bubbles collected in the tray (12), water is applied using a Java pipe (2υ).The ash-rich coal particles and ash particles that do not adhere to the air bubbles α0 together with water reduce the liquid level in the cell αυ. It passes through the adjustment gate α barrel and flows into the mall box (6).

The ash-rich coal particles and ash (11) and water that have flowed into the tail box flow into the downstream cells through the flow inlet (force), and the same operation is repeated again.

Here, we return to FIG. 2 again to continue the explanation.

Now, in Fig. 2, the coal particles undergo the action explained in Fig. 1 in cell I, and the coal particles H with low ash content are collected into the tray (toward) along with air bubbles, and the coal particles with high ash content and ash content are collected in the tray. It flows into the box, passes through pipe 0 → and flows into cell ■, where it is again subjected to the same effect on cell I. Then, the coal particles with low ash content (coal particles with low ash content) are collected together with air bubbles into the tray (coal particles with low ash content), and the coal particles with high ash content and low ash content flow into the tail box, flow through pipe H to cell ■, and return to cell I. have the same effect.

Rings indicate coal particles with low ash content, rings indicate coal particles with high ash content and ash content, and the particles and ash content are sent to ash treatment equipment such as wastewater treatment through tail boxes and pipes. The coal particles with low ash content collected in the tray (T) have a large capacity because they are together with air bubbles, but the processing capacity is reduced by crushing the air bubbles as much as possible with Java water. Coal grains with low ash content are collected in tray 0υ with air bubbles ♂, and the processing capacity is reduced with Java water, resulting in a product with a coal concentration of 40 to 5.
The deashing process is completed when the amount becomes 0% by weight. Coal particles with a high ash content and ash content in cell 1v are collected in a tail box and sent to cell 2 again through pipe f3'4.

The flow structure when a flotation machine is used in the deashing process for a highly concentrated coal water slurry is as described above, but when it is applied to a highly concentrated coal water slurry, it has the following drawbacks.

(1) Since the coal particle size of the highly concentrated coal water slurry is as fine as 65% to 90% of the 200 mesh pass, a large amount of a mixture reagent of foaming agent and scavenger is required for flotation. ) The air bubbles that attached the low ash coal particles collected in Ov were strong and difficult to eliminate with Java water alone. - (II) Due to the deashing treatment of highly concentrated coal water slurry, there is a large amount of coal collected in the tray, and a large amount of roughly selected air bubbles collected in the tray from cells ■, ■, and ■1 becomes difficult to defoamer. There is a large amount of Java water for this purpose. However, the added Java water flows into cell ■ (selected area), the concentration of coal in cell ■, the concentration of the mixture of foaming agent and scavenger reagent decreases, the flotation rate in cell IV increases, and cell 1■ There was a drawback that the yield (refined yield) of coal elυ with a lower ash content recovered in the tray Gυ deteriorated.

(1) The capacity of the wastewater treatment process that is downstream from the tray (if there is a lot of Java water to collapse the air bubbles in the low-ash coal @ 0 (refined) recovered in 31J, the capacity is increased from the cell ■ to the pipe) The drawback was that it was larger and the construction costs were higher.゛The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and aims to reduce the amount of Java water used in Tray C. Applying shear force to the bubbles,
The present invention aims to provide a flotation machine in which the tray is equipped with a mechanical device for reducing or crushing air bubbles, and an embodiment thereof is shown in FIGS. 8 to 6.

The present invention will be described below with reference to the embodiments shown in FIGS. 8 to 6. In FIG. ) (c) shows some examples of bar (101) or (102) (
108) are spirally attached in the direction C in which coal with a low ash content is sent, and it is possible to crush or reduce the size of air bubbles by applying shearing force to the air bubbles. The shape of the bar is the bar (101) shown in Figure 4 (a), (
The bar (102) shown in C1), the bar (102) shown in (C)
8), a shape that can easily apply shearing force to the air bubbles can be considered.

The rotating body is rotated at a high speed of 800 to 1000 rpm to effectively apply shearing force to the air bubbles.

FIG. 5 shows another embodiment of the invention. In Figure 5,
A stirring plate fl12) is attached to two chinos (118) provided in the tray (to), and a shearing force is applied to the air bubbles by a chain wheel (111) attached to a drive shaft (110). Rotate like this. Also, the driven shaft (115)
The chain wheel (114) is also attached to it and is driven. (1
16) (117) is a bearing, which is fixed to the tray (to).

FIG. 6 is a sectional view taken along the line A-A in FIG. 5, and (118) is an outlet for coal with a low ash content. Further, the moving speed of the stirring plate (112) is preferably at least twice the moving speed in the direction in which coal with a low ash content is sent, so as to apply shearing force to the air bubbles.

Since the present invention is configured as explained in detail above,
By applying a shearing force to the air bubbles collected in the tray, the air bubbles can be made smaller or crushed. Therefore, the capacity to be treated with Java water in the tray can be reduced, and the amount of Java water can be reduced.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional coal flotation machine, Figure 2 is a plan view showing a deashing process in which cells equipped with the flotation machine of Figure 1 are arranged side by side, and Figure 8 is a side sectional view showing a conventional coal flotation machine. A plan view of a tray in a flotation machine showing an embodiment of the present invention, FIG. 4 (A) (0) (C)
8 is a perspective view of a bar attached to the rotating cylinder of FIG. 8, each showing a different embodiment, FIG. 5 is a plan view of a tray showing an embodiment different from that of FIG. 8, and FIG. 6 is a cross section taken along line A-A in FIG. 8. It is a diagram. Description of main parts of the figure 80...Tray 100...Rotating cylinder 10
1, 102.108... Bar 112... Stirring plate Patent applicant Mitsubishi Heavy Industries, Ltd. Ryonichi Engineering Co., Ltd. 7
Figure 3 Figure 4 (a) 1 bite) (/\) Figure 5 π

Claims (1)

[Claims] In a coal flotation machine that deashes pulverized coal such as 200 mesh pass 65 to 90%, in a coal flotation machine that has a tray in which coal particles with a low ash content are collected together with air bubbles, the collected coal particles are A coal flotation machine characterized by being equipped with a 40m length that mechanically applies shearing force to air bubbles.