Industrial Hollow Cone Nozzles
Precision Atomization for Cooling, Gas Scrubbing & Chemical Spraying
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CYCO Hollow Cone Nozzles deliver fine atomization, uniform spray performance, and reliable industrial operation.
Available in multiple spray angles, flow capacities, and corrosion-resistant materials, they are ideal for: Cooling Systems, Gas Scrubbing, Dust Suppression, Chemical Processing, Humidification and Environmental Treatment.
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3 Types of Hollow Cone Nozzles
Axial Hollow Cone Nozzles
Water enters and exits along the nozzle’s central axis. An internal vane or swirl insert imparts rotation, producing a stable hollow cone spray pattern.
Ideal for applications requiring consistent coverage at low-to-medium pressures, including gas cooling, evaporative cooling, and wet scrubbing.
- Stable ring pattern even at variable pressures
- Low internal pressure drop — energy efficient
- Replaceable swirl insert for easy maintenance
- Available in corrosion-resistant alloys (Hastelloy C)
Tangential Hollow Cone Nozzles
Liquid enters through tangential ports in the nozzle body, creating a high-speed swirling vortex before exiting the orifice.
This design produces extremely fine droplets with exceptional size uniformity, ideal for chemical injection, dust suppression, and humidification systems.
- Finest droplet sizes in the hollow cone family
- Excellent liquid-gas contact for absorption
- Self-draining design prevents post-drip
- Precise flow coefficients for accurate dosing
Spiral Hollow Cone Nozzles
A unique spiral-shaped deflector creates the hollow cone pattern without any internal passages that could clog.
The open free-passage design makes these nozzles ideal for slurries, paper pulp, waste water treatment, and any liquid containing fibrous or abrasive solids.
- Largest free passage — virtually clog-free
- Handles slurries up to 30% solids content
- No internal parts to wear or block
- Low maintenance — rinse clean in seconds
Applications Across Industries
From power generation to precision agriculture — hollow cone nozzles perform wherever ring-pattern spray distribution is required.
🌾 Agriculture & Horticulture
Tangential hollow cone nozzles reduce pesticide drift by up to 60% compared to flat fan designs, while maintaining complete canopy penetration. Used in boom sprayers, orchard sprayers, and greenhouse irrigation.
🏭 Industrial Gas Cooling
Evaporative cooling of hot flue gases in cement kilns, steel mills, and waste incinerators. The hollow pattern maximizes surface area for water-to-gas contact without wetting duct walls.
💨 Wet FGD Scrubbers
Spiral hollow cone nozzles spray limestone slurry in SO₂ absorption towers. Large free passage prevents clogging; wide coverage angle ensures full cross-section contact with rising flue gas.
🔥 Fire Suppression
Deluge systems and water mist suppression use hollow cone nozzles for fast area coverage. The ring pattern creates a curtain effect around hazardous equipment without flooding non-target zones.
🧪 Chemical Processing
Reactor vessel washing, chemical dosing into pipelines, and pH neutralization. Tangential designs enable precise, metered liquid addition at consistent droplet sizes for controlled reaction kinetics.
🌊 Wastewater Treatment
Aeration, odor control, scrubbing, and sludge dewatering. Hollow cone spray nozzles handle high-solids effluent that would clog conventional nozzles, reducing maintenance frequency and plant downtime.
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Hollow Cone Nozzles: Types, Applications & Selection Guide
In industrial spraying systems, choosing the correct nozzle directly affects spray efficiency, atomization quality, fluid distribution, and operational performance. Among the many spray nozzle designs available today, hollow cone nozzles are widely used for applications requiring fine atomization, uniform droplet formation, and ring-shaped spray coverage.
From gas scrubbing and evaporative cooling to chemical processing, dust suppression, fire protection, and agricultural spraying, hollow cone nozzles play an essential role across numerous industries.
But how do hollow cone nozzles actually work? What makes their spray pattern different from full cone or flat fan nozzles? And how can you select the right hollow cone nozzle for your system?
This comprehensive guide explains everything you need to know.
Table of Contents
1. What Is Hollow Cone Nozzle?
Hollow cone nozzle is a spray nozzle designed to produce a circular, ring-shaped spray pattern where liquid concentration is highest around the outer edge of the cone, while the center area remains relatively open or low in liquid density.
Unlike full cone nozzles, which distribute liquid evenly throughout the entire spray area, hollow cone designs focus liquid toward the perimeter.
This unique spray structure makes them particularly effective in applications requiring:
- Fine atomization
- High droplet surface area
- Rapid evaporation
- Efficient gas-liquid contact
- Uniform peripheral coverage
- Controlled liquid distribution
Hollow cone nozzles produce small to medium-sized drops, forming this hollow cone pattern with a ring-shaped impact area. The large, unobstructed flow passage minimizes clogging, allowing for uniform distribution at a wide range of flow rates and pressures, as well as effective atomization of liquids even at lower pressures.
They are suitable for processes involving cooling, humidification, absorption, and atomized spraying.
Key Characteristics of Hollow Cone Nozzles
Typical hollow cone nozzle features include:
Feature | Description |
Spray Pattern | Hollow circular cone |
Droplet Size | Fine to medium |
Atomization Quality | Excellent |
Spray Angle | Commonly 30°–120° |
Flow Range | Wide industrial range |
Pressure Requirement | Low to high pressure options |
Applications | Cooling, scrubbing, spraying, humidification |
Because of their efficient atomization capability, hollow cone nozzles are often selected for systems where maximizing liquid surface exposure is important.
2. Hollow Cone Spray Pattern Explained
Understanding the hollow cone spray pattern is critical when selecting the right nozzle. The spray geometry of hollow cone nozzles differs significantly from other common nozzle types.
Hollow Cone Pattern Structure
The spray forms:
- Circular cone shape
- Open or low-density center
- Liquid concentrated along the cone edge
- Uniform peripheral distribution
This geometry provides several performance advantages.
Because liquid spreads over the cone perimeter, hollow cone nozzles can achieve:
- Larger effective contact areas
- Improved atomization
- Efficient evaporation
- Enhanced gas-liquid interaction
3. How Hollow Cone Nozzles Work?
The operating principle of hollow cone nozzles is based on centrifugal force and swirling liquid motion.
Inside the nozzle body, liquid enters through specially designed internal channels or swirl chambers. These internal structures force the liquid to rotate rapidly before exiting the orifice.
As rotational velocity increases, centrifugal force pushes the liquid outward toward the nozzle wall.
When the liquid exits the nozzle opening:
- The rotating fluid expands outward.
- A hollow circular spray cone forms.
- The center of the cone remains partially empty.
- Liquid concentrates around the outer perimeter.
The result is a highly atomized hollow cone spray.
Internal Working Principle of Hollow Cone Nozzles
Most industrial hollow cone nozzles operate using one of two common mechanisms:
(1) Tangential Swirl Design
In this design:
- Liquid enters tangentially into a swirl chamber.
- Internal rotation is generated.
- High-speed spinning produces centrifugal atomization.
Tangential hollow cone nozzles are known for:
- Fine droplets
- Excellent atomization
- High spray uniformity
They are widely used in:
- Gas conditioning
- Chemical injection
- Cooling towers
- Odor control systems
(2) Axial Swirl Design
Axial swirl designs use:
- Internal vanes
- Spiral inserts
- Swirl plates
These components create rotational movement along the nozzle axis.
Advantages include:
- Stable spray formation
- Reliable flow control
- Broad pressure adaptability
- Industrial durability
Axial hollow cone nozzles are frequently used in harsh industrial environments.
4. Main Benefits of Hollow Cone Spray Nozzles
Hollow cone spray nozzles are designed to provide fine atomization, efficient spray distribution, and reliable industrial performance. Their unique spray characteristics make them suitable for cooling, gas scrubbing, chemical processing, and many other industrial applications.
Why are hollow cone nozzles so widely used in industrial systems? Several key advantages explain their popularity.
- Excellent Atomization Performance
One of the most important strengths of hollow cone nozzles is high-quality atomization.
Their internal swirl mechanism naturally produces:
- Small droplets
- Uniform spray particles
- Efficient liquid breakup
This improves:
- Cooling efficiency
- Mixing performance
- Evaporation speed
- Chemical dispersion
- Enhanced Gas–Liquid Contact
Many industrial processes involve interaction between gases and liquids.
Examples include:
- Scrubbing towers
- Exhaust treatment systems
- Chemical reactors
- Air humidification equipment
Hollow cone spray geometry increases droplet exposure to gas streams, significantly improving transfer efficiency.
- Reduced Liquid Consumption
Fine atomization often enables:
- Better spray utilization
- Less fluid waste
- Lower operating costs
For high-volume industrial operations, optimizing liquid usage can generate meaningful savings.
- Broad Pressure Compatibility
Modern hollow cone nozzles are available for:
- Low-pressure systems
- Medium-pressure applications
- High-pressure atomization processes
This flexibility supports use across multiple industries.
- Wide Material Availability
Industrial hollow cone nozzles can be manufactured using different materials for corrosion resistance, temperature resistance, and chemical compatibility.
Common materials include:
- Stainless steel
- Brass
- PP
- PVDF
- Ceramic
- PTFE
- Special alloys
Selecting the proper material improves nozzle lifespan and operational reliability.
5. Which Type of Hollow Cone Nozzle Should You Choose?
There are three hollow cone nozzle designs: axial, tangential, and spiral. Each solves a different spraying challenge. Specifications for each type are listed in the product section above; this section explains how to choose between them.
Choose Axial Hollow Cone Nozzles when:
Your process runs at low-to-medium pressure and needs stable, repeatable spray coverage over long operating hours — evaporative cooling towers and wet scrubbers are typical fits. Their replaceable swirl insert also makes them the easiest of the three to service in the field.
Choose Tangential Hollow Cone Nozzles when:
Droplet fineness matters more than anything else — chemical dosing, humidification, and odor control systems where precise, uniform droplet size directly affects process accuracy. Avoid this type if your liquid carries any suspended particles. The tangential ports clog faster than the other two designs.
Choose Spiral Hollow Cone Nozzles when:
Your liquid isn’t clean — slurries, pulp fibers, or wastewater with suspended solids. This is the only one of the three designs with no internal parts to block, so it’s the default choice whenever clogging risk is a real operational concern rather than a theoretical one.
Common Selection Mistakes
– Choosing tangential nozzles for dirty liquids because they produce the finest droplets, then facing frequent clogging — droplet fineness and clog resistance work against each other across these three types.
– Assuming axial nozzles need external power — like all three types, axial hollow cone nozzles are fully liquid-pressure driven; no motor is required.
– Mixing materials across a single system — pairing a Hastelloy nozzle body with a standard PTFE seal in a highly corrosive process shortens seal life well before the nozzle body itself wears out.
6. Hollow Cone Nozzles in Practice: Two Closer Looks
The unique spray characteristics of hollow cone spray nozzles make them indispensable across a broad range of industrial sectors.
Gas Scrubbing & Flue Gas Desulfurization
In wet FGD towers, hollow cone nozzles atomize limestone slurry into the rising flue gas stream. The ring-shaped spray pattern is deliberately chosen over a full cone here.
Because the center of the spray remains open, gas can pass through the spray zone while still contacting droplets across the full cross-section, maximizing SO₂ absorption without flooding the tower’s centerline.
Spiral hollow cone designs are typically specified for this application because limestone slurry carries suspended solids that would clog a tangential nozzle within days.
Dust Suppression
Unlike full cone nozzles, which wet dust at ground level, hollow cone nozzles are positioned to intercept airborne dust before it settles. The fine droplet size (typically under 150 µm from tangential designs) stays suspended in the air long enough to collide with dust particles, causing agglomeration and fallout.
A single hollow cone nozzle can cover a wider radial area than an equivalent full cone nozzle at the same flow rate, which is why fewer nozzle points are typically needed per zone in mine and quarry dust suppression layouts.
Also Used In
- Agricultural Spraying — disc-and-core hollow cone nozzles reduce pesticide drift while penetrating dense canopy.
- Chemical Processing — tangential designs enable precise, metered dosing into reactor vessels.
7. Hollow Cone Nozzles vs Full Cone Nozzles
Understanding the difference between hollow cone and full cone nozzles is critical for selecting the right spray solution.
Feature | Hollow Cone Nozzles | Full Cone Nozzles |
Spray Pattern | Ring-shaped (hollow center) | Fully filled cone |
Atomization | Fine droplets | Medium droplets |
Gas-Liquid Contact | Excellent | Moderate |
Surface Coverage | Peripheral distribution | Uniform full coverage |
Cooling Efficiency | Very high | High |
Best Use | Scrubbing, evaporation, cooling | Washing, rinsing, cleaning |
Hollow cone nozzles direct liquid away from the center, so they’re not the right choice when uniform solid-area coverage is needed — that’s where full cone nozzles take over.
Need help choosing between them for your specific process? Read the Full Cone vs Hollow Cone Nozzle Guide
8. How to Select the Right Hollow Cone Nozzle?
Choosing the correct hollow cone nozzle for a given application requires evaluating several interconnected parameters.
- Define the Application Function
The starting point is identifying what the spray process must accomplish: cooling a gas stream, suppressing dust, humidifying air, applying a chemical, or cleaning a surface.
Each function places different demands on droplet size, spray angle, flow rate, and operating pressure.
- Determine Required Flow Rate and Operating Pressure
Hollow cone nozzles support flow rates ranging from under 0.2 liters per minute to over 12,000 liters per minute, and operating pressures from very low (under 1 bar) to very high (above 10 MPa), depending on design.
Establishing your system’s available pressure and the required volumetric throughput narrows the selection significantly.
- Select Spray Angle
Spray angle determines coverage width at a given nozzle-to-target distance.
A useful formula for estimating coverage radius is: spray width ≈ 2 × distance × tan(spray angle ÷ 2).
Axial-flow hollow cone nozzles typically provide angles up to 90 degrees, while tangential-flow designs extend to 130 degrees, and some specialized designs reach 180 degrees.
- Match Droplet Size to Process Requirements
Applications like gas cooling and gas scrubbing benefit from the smallest possible droplet sizes because fine droplets provide maximum surface area for heat and mass transfer. Washing and dust suppression can tolerate larger droplets.
Higher operating pressure and axial-flow swirl inserts produce finer atomization; lower pressures and tangential designs yield somewhat coarser, more uniform drops.
- Choose the Right Material
Spray nozzle materials must be compatible with the liquid being sprayed, the operating temperature, and the presence of abrasive or corrosive compounds.
Common materials include:
- Brass (general-purpose, moderate corrosion resistance)
- 316L stainless steel (chemical resistance, food-grade applications)
- Hastelloy (highly corrosive media)
- Polypropylene (mild chemicals, light-duty use)
- PVDF (aggressive chemicals and elevated temperatures)
- Ceramic (extreme wear resistance in abrasive service)
- Consider Clogging Risk
If the spray liquid contains suspended solids, slurries, or particulate matter, selecting a nozzle with a large free passage area, such as a spiral hollow cone design, reduces clogging risk.
Installing upstream strainers or filters is strongly recommended in any application where liquid cleanliness cannot be guaranteed.
9. Maintenance Best Practices
Even a well-selected hollow cone spray nozzle requires periodic attention to maintain consistent performance.
Regular inspection is the foundation of a reliable spray system. Over time, wear at the orifice or swirl chamber walls causes the spray angle to change, droplet distribution to become uneven, and flow rate to increase as the opening enlarges.
Visual inspection of the spray pattern, comparing it to the original specification, is the simplest diagnostic step.
Cleaning should follow the spray nozzle manufacturer guidelines. Many hollow cone nozzles have removable orifice inserts or swirl chambers that can be extracted for soaking in appropriate solvents. Mechanical probing of orifice holes with metal picks should be avoided, as it permanently damages precision-machined surfaces.
Replacement schedules depend on the liquid handled, operating pressure, and material. Ceramic-tipped nozzles offer exceptional wear life in abrasive service; stainless steel provides a good balance of durability and corrosion resistance for most industrial applications.
Tracking nozzle age and comparing actual flow rates to nominal values over time helps predict when replacement is needed before performance degrades to unacceptable levels.
10. FAQs
Q1. What is the difference between hollow cone and full cone nozzles?
Hollow cone nozzles produce a ring-shaped spray pattern with a hollow center, while full cone nozzles distribute liquid evenly across the entire cone.
Hollow cone designs are better for evaporation and gas interaction, while full cone nozzles are used for washing and surface coverage.
Q2. What is the difference between axial and tangential hollow cone nozzles?
Axial-flow nozzles introduce liquid along the central axis and use swirl vanes to create rotation, producing the finest possible droplets.
Tangential-flow nozzles introduce liquid through off-center ports that immediately induce spinning, delivering a very uniform distribution at spray angles up to 130 degrees.
Q3. Can hollow cone nozzles handle slurries or liquids with solids?
Spiral hollow cone nozzles are specifically engineered for this purpose, offering large unobstructed internal passages. Standard axial or tangential designs can handle light particulate with appropriate upstream filtration.
Q4. How does pressure affect hollow cone spray performance?
Higher pressure produces finer droplets and can modify the spray angle slightly. Lower pressure generates larger, more uniform droplets. Each nozzle has an optimal pressure range; operating outside it degrades performance and accelerates wear.
Q5. What spray angles are available for hollow cone nozzles?
Common spray angles range from 30 degrees to 180 degrees, with 60, 90, and 120 degrees being the most widely used in industrial applications.
Q6. How do I know when a hollow cone nozzle needs replacement?
Indicators include a visibly distorted or asymmetric spray pattern, flow rate higher than specification (indicating orifice wear), increased pressure drop across the nozzle, or visible physical damage to the orifice or body.
11. Conclusion
Hollow cone nozzles are one of the most efficient and versatile spray nozzle types used in modern industrial systems. Their unique ring-shaped spray pattern, fine atomization performance, and strong gas-liquid interaction capability make them essential for applications such as cooling, scrubbing, chemical processing, and dust control.
Selecting the correct hollow cone nozzle requires carefully defining the application requirements: flow rate, pressure, required droplet size, spray angle, liquid composition, and operating environment. And matching those requirements to the appropriate nozzle design type and material.
