The nozzle is the "last mile" that turns hot water into a uniform rain curtain. If you choose the wrong model, no matter how large the water volume is, it will be in vain - dry spots on the packing, drifting white smoke, and a sharp increase in electricity bills. The root cause often lies in these small plastic holes that cost just a few cents. Follow these six steps to turn "mysticism" into "check the box".
I.COOLING TOWER NOZZLE: calculate the "single-mouth burden"
The total circulating water volume Q (m³/h) ÷ the planned number of nozzles N = the single-nozzle flow rate q (L/min).
According to the design specification, leave a 10% wear allowance, that is, q = 1.1q.
Check the flow-pressure curve of the manufacturer and find the minimum pressure P corresponding to q. For power plant towers, 0.3 to 0.5 bar is commonly used, while for civil towers, 0.1 to 0.2 bar is sufficient.
II. COOLING TOWER NOZZLE: Select "Splashing Method"
Three-splash type: ABS/PP material, three-stage atomization, covering circle diameter 1.2-1.8 m, suitable for counter-flow towers, water drift ≤ 0.005%, price 0.6-1 USD per piece.
Target type (target nail type) : Central impact nail, larger water droplets, less prone to clogging, used in steel plant circulation with poor water quality and high dust.
Cyclone type: It relies on centrifugal force to form an umbrella-shaped film of water, with a heat dissipation efficiency of 8% higher. However, the water quality must be ≤50 NTU; otherwise, the spiral groove is prone to scaling.
III. COOLING TOWER NOZZLE: Determine the "Diameter and Disc Diameter"
For small towers (<100 t/h), use φ 75mm small trays with a water distribution radius of 1.2m. The mainstream power plant towers choose φ 110-130mm medium plates, with a coverage rate of 95%. The 1,000-ton large tower is directly equipped with a φ 150mm large plate to prevent the "skylight" dry zone. The principle of matching diameter and pressure: The higher the pressure, the smaller the diameter; otherwise, excessive atomization and excessive water drift will occur.
IV. COOLING TOWER NOZZLE: Check "Material corrosion resistance"
ABS: Impact-resistant, with a lifespan of 5 to 6 years below 70 ℃, and low unit price.
PP: Resistant to acids and alkalis, up to 80 ℃, slow to UV aging, a must-have for seawater projects.
Nylon 66+ glass fiber: Temperature resistance 100 ℃, preferred for high-alkali water, price ×2.
When the water quality Cl⁻ is greater than 200 ppm, choose PP or nylon to avoid stress cracking of ABS.
V. COOLING TOWER NOZZLE: Anti-Loosening and Disassembly and Assembly
The high-quality nozzle is equipped with a snap-on, double threads and O-ring, and can withstand a water pressure of 1.5MPa and fan vibration for 500 hours without loosening. The maintenance channels for tower inspection are limited. The "plug-and-pull" quick-release structure is selected, and the replacement can be completed in 30 seconds, reducing downtime.
VI. COOLING TOWER NOZZLE: Three-step On-site verification
Paper layout: Draw the layout diagram in the shape of an equilateral triangle or plum blossom, ensuring that the distance between the edge nozzles and the packing wall is ≤ 100mm.
Test the water and check the film: After turning on the machine, take a slow-motion photo of the surface of the packing material with your mobile phone. If the water film is uniform without dry spots, it is qualified. The appearance of a "black line" indicates that the dead corner is being covered, and the nozzle needs to be replenished or the Angle adjusted.
Drift test: Tie two pieces of white gauze at the outlet of the air duct at the top of the tower. If the weight gain is less than 0.2g /m³ within 10 minutes, it will reach the CTI drift grade A.
Remember the mnemonic: Calculate the flow rate accurately, match the pressure, determine the material based on the water quality, adjust the diameter of the coil according to the tower, check for loosening, and take photos for covering.
