JPH0227899Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a cyclone separator, and in detail, it can be used without significantly reducing dust collection efficiency.
This invention relates to a cyclone separator that reduces pressure loss in cyclones and connecting ducts. Cyclone separators are widely used, for example, as preheaters in cement baking equipment, dust collectors in crushing equipment, and the like. The inventor conducted various experiments on the cyclone separators used in these systems from the viewpoint of energy saving, and as a result, he devised a cyclone separator that reduces pressure loss without significantly reducing dust collection efficiency. I reached it. The features of the present invention will be explained below with reference to experimental examples. Experimental Example 1 Figure 1 shows that by arranging the agglomeration plate 2 in the cyclone 1 and its position,
This figure shows the installation position of the aggregation plate 2 for measuring how the pressure loss of the cyclone changes. The aggregation plate 2 is disposed on the ceiling 1a of the cyclone 1, and is positioned so that its surface faces the gas flowing into the cyclone 1. However, the ratio of each dimension of the cyclone 1, gas inflow duct 4, and gas discharge duct 3 is a=86, b=64, c=18, d=
49, e=41, f=29,58, and the width W of the aggregation plate 2
= 20, height H = 20. The results of experiments conducted using such an apparatus are shown in Table 1. However, position A is between the point where the gas inflow duct 4 and the side wall of cyclone 1 intersect (duct outlet) 4a and position B, position C is 1/4 circle of cyclone 1, and position D is 2/4 circle. , position E is 3/4 circle.

【table】

[Table] is not included.
FIG. 2 is a graphical representation of Table 1 above. As is clear from FIG. 2, the aggregation plate 2 is extended from the point A to C in FIG. It can be seen that pressure loss is significantly reduced when it is preferably installed within the range of the circle, and more preferably within the range from A to B. The gas flowing into the cyclone 1 hits the aggregation plate 2 and flows downward, but the pressure loss of the cyclone increases as it progresses from position C to E.
This is thought to be because the amount of gas colliding with the aggregation plate 2 is reduced. Experimental Example 2 Next, as shown in Fig. 3, aggregation plates 2 of various sizes were placed at position B in Fig. 1, and the inclination angle α of the aggregation plates 2 was set to 90° and 45°, and a cyclone was applied. The pressure drop and dust collection efficiency were measured. The measurement results are shown in Table 2. However, the device is the same as in Experimental Example 1, and the inner cylinder length (length ratio of the part of the exhaust duct 3 protruding into the cyclone 1) f=
It is 67.

【table】

[Table] Figure 4 is a graphical representation of Table 2. From FIG. 4, it can be seen that if the sizes of the aggregation plates 2 are exactly the same, the smaller the angle α of the aggregation plates 2,
In other words, if the agglomerating plate 2 is slanted and hung in the downstream direction of the gas, the change (decrease) in the dust collection efficiency with respect to the change in the size (height H) of the aggregation plate 2 is smaller, and from FIG. When the angle α of the aggregation plate 2 is the same (α = 45°), the pressure loss tends to decrease as the size of the aggregation plate 2 (width W x height H) increases, especially when the width W changes. It can be seen that the influence is large. This is because by tilting the aggregation plate 2 or by designing it to be large, the powder flow flowing in from the duct can be turned into a downward swirling flow immediately after the inflow, which causes the inner wall of the cyclone 1 to reach the inner wall of the cyclone 1 more than necessary. This is thought to be because the gas can be discharged from the gas discharge duct 3 without being rubbed. That is, the aggregation plate 2 exerts a downward force on the powder flow, reduces the number of turns of the powder flow, and reduces energy loss due to the swirl. Note that the shape of the aggregation plate 2 is not limited to the flat plate adopted in the above experimental example, but may be any shape that allows the gas flow flowing into the cyclone 1 to descend smoothly; for example, as shown in Fig. 5. It could be something like this. As shown in FIG. 6, the aggregation plate 2 should be installed at an appropriate distance β from the part of the gas inflow duct 4 where the gas concentration distribution 5 is large, that is, from the side wall 1b inside the cyclone 1, and at a gas flow rate of 6. If the agglomerating plate 2 is installed so as to cover the fast moving part, the pressure loss will be lower and the dust collection efficiency will be higher with the same aggregating plate 2. Furthermore, as shown in FIG. 7, if the aggregation plate 2 is used as a discharge electrode 7 and part or all of the main body of the cyclone 1 is used as a dust collection electrode 8, it goes without saying that the dust collection efficiency will be further increased. do not have. The present invention was developed through various experiments as mentioned above.
The upper end of the aggregation plate 2 is disposed on the cyclone ceiling 1a within a quarter circle of the cyclone in the gas inflow direction from the intersection of the gas inflow duct 4 and the side wall of the cyclone 1, and It was discovered that a cyclone separator can be provided that can reduce the pressure loss of the cyclone and the connecting duct without significantly reducing the dust collection efficiency by making the lower end slope and hang down in the downstream direction of the gas.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the installation position of the agglomeration plate of the apparatus of Experimental Example 1, Figure 1 is its vertical cross-sectional view, Figure 2 is a graph showing data from Experimental Example 1, and Figure 3 is a graph showing the data from Experimental Example 1. The figure shows the apparatus of Experimental Example 2, and is a vertical cross-sectional view showing the installation state of the agglomeration plate, Figure 3 is a cross-sectional view thereof, Figures 4 to 4 are graphs showing data from Experimental Example 2, and Figure 5 , is a diagram showing another shape of the aggregation plate, FIG. 6 is a cross-sectional view showing the aggregation plate installed away from the cyclone wall, and FIG.
The figure is a longitudinal sectional view of a cyclone with an additional electrostatic precipitator installed. 1...Cyclone, 1a...Ceiling, 2...Agglomeration plate, 3...Exhaust duct, 4...Gas inflow duct,
4a...Duct exit.

Claims (1)

[Scope of utility model registration request] The upper end of the aggregation plate is placed on the cyclone ceiling within a quarter circle of the cyclone in the gas inflow direction from the intersection of the gas inflow duct and the cyclone side wall, and the lower end of the aggregation plate is placed on the downstream side of the gas flow. A cyclone separator characterized by being tilted and hanging down.