① According to the required water spraying amount (the minimum water spraying amount is about 0.1-0.3m3/h, and the maximum water spraying amount is 20m3 / h) and the applied pressure C is generally about 0,1 ~ (x 2MPa), the water outlet area can be calculated according to the following formula_ F (M2), and then calculate the outlet diameter
0!= 2><1057^ (6-83)
0!= 2><1057^ (6-83)
Where Qi is the amount of water spray, MVH; Is the inlet pressure, MPa.
② What's the height of the magic hole? The larger the diameter is, the more the water rotates in the hole, and the more uniform the velocity distribution of water on the whole circumference is, but too much T will increase the resistance. Average? About 2mm.
③ In order to avoid hindering the dispersion of water, at the outlet
④ There is a cone between the seal and the hole, which is used to reduce the rotation diameter of the water flow and avoid excessive resistance or turbulence. Generally, jn is determined according to the area of the hole circle is about 2. S times of the area of the hole circle.
⑤ To determine the volute size: a. the cross-sectional area of the throat at / is 2 times of the area of & hole, that is to say /; b. Taking the imaginary circle center of the water outlet as the center of the square block, and the length of each side of the square block w = / / 4, the Archimedean curve is drawn according to the following relationship:
R 4 = I? O + * g - /, I? 5 + /, I? O = I? O +. J /, re = ro+
⑥ I8 decision should ensure that the flow is stable, the resistance is small, generally in the range of 10 ° to 16 ° selection, the effect is better. a =
⑦ The diameter of the inlet pipe should be less than 2. Generally, the cross-sectional area of the inlet pipe should be 1.3-2 times of that of the inlet pipe.
⑧ The distance C between the center line of the water inlet and the center line of the nozzle is generally taken as 1.2 & FW
⑨ Other dimensions are shown in table 6-45.
⑩ The pressure flow curve of spiral nozzle is shown in Fig. 6-97.
The spiral nozzles used in the past are all single spiral, and the other is multi spiral.
The multi spiral nozzle is a new series of blockage prevention nozzles. The spray area of the nozzle is composed of a series of one or more continuous concentric circular hollow conical rings, and the spray shape is two types of hollow cones and solid cones. The unique design structure of the nozzle can make the outlet size of the nozzle with small flow rate reach the liquid flow section several times larger than that of the general nozzle. Because there is no inner core structure, the channel of the nozzle is more smooth and the blockage phenomenon is minimized. Moreover, the liquid injection efficiency of the nozzle is high, so under the same injection conditions, the pressure of the water pump can be lower, which has the effect of energy saving and efficiency increasing.
The nozzle is mainly used in wet dust collector, gas cooling, evaporative cooling, air humidification, cooling and other equipment. It is also the nozzle for dust removal and cooling of converter flue. The variable connection form and variable overall structure of the nozzle are also suitable for use.