Spray technology · Clean air
Precision in Every Drop: Where Spray Technology Meets Clean Air
For more than a century, one idea has driven Lechler's engineering: the belief that a single, well-formed droplet can do remarkable work. It's a philosophy captured in three words — precision in every drop. At first glance it sounds like a tagline. Look closer at how a gas scrubber actually cleans a polluted gas stream, and you'll find it's simply a description of the physics: the meeting point of Lechler's precision spray nozzles and the custom-engineered scrubbers built for emission reduction and gas purification. One world perfects the droplet. The other builds the system that puts millions of those droplets to work.
Key takeaways
- The cleaning happens in the droplet, not in the vessel, pumps or piping.
- Scrubber performance is driven by liquid surface area — which is set almost entirely by droplet size.
- Smaller isn't automatically better: every application has an optimum droplet size.
- Two kinds of precision combine — the nozzle perfects the drop, the scrubber gives it purpose.
The droplet does the cleaning
A wet scrubber works on a deceptively simple principle. A contaminated gas stream is passed through a curtain of atomized liquid. As the gas and the spray meet, pollutants — whether soluble gases, fine particulates, or aerosols — are absorbed or captured by the liquid and carried away, leaving a cleaner stream to exit the stack.
The entire process lives or dies on one variable: the surface area of liquid available for the gas to touch. The larger that contact area, the more pollutant can transfer from gas to liquid, and the better the scrubber performs. And here is the elegant part — surface area is governed almost entirely by droplet size. For any given volume of scrubbing liquid, smaller droplets create dramatically more surface area than larger ones. Split a single large drop into a fine mist and you multiply its reactive surface many times over.
The cleaning power of a scrubber isn't really in the vessel, the pumps, or the piping. It's in the droplet — each one a tiny chemical reactor.
Why “smaller” isn't simply “better”
If finer droplets mean more surface area, why not atomize everything into the finest possible fog? Because a scrubber is a balancing act, and this is exactly where engineering judgment earns its keep.
Very fine droplets have less mass. They settle slowly, drift easily, and tend to get swept straight out of the system by the moving gas before they've done their job — a problem engineers call carryover. They also spend less time in contact with the gas. Larger droplets, on the other hand, carry better into a fast gas flow and resist entrainment, but they offer less surface area per litre sprayed.
The result is that every scrubbing application has an optimum droplet size — fine enough to maximize contact, robust enough to stay where it's needed for as long as it's needed. Finding and holding that optimum, across changing flow rates and gas compositions, is precision work in the truest sense.
Two kinds of precision, one clean result
This is where the two worlds become one.
Precision in the component
Producing exactly the right droplet — the right size, the right spray angle, an even distribution with no gaps, and the resilience to keep doing it while spraying abrasive or particle-laden liquids — is the discipline Lechler has spent over 140 years and more than 25,000 nozzle variants perfecting. A hollow cone for fine atomization, a clog-resistant spiral nozzle, a half-cone designed to spray inward from a tower wall: each is a deliberate choice that shapes the droplet, and therefore shapes the result.
Precision in the system
A perfect nozzle is only as effective as the system it serves. A scrubber must be engineered around the real application — the specific pollutant, the gas volume and velocity, the temperature, the required removal efficiency, and the emission limits that have to be met. Nozzle type and placement, the number of spray tiers, the liquid-to-gas ratio, counter-current flow, the mist eliminator that catches stray droplets: every decision is tuned to the job. Not a product off a shelf, but a solution engineered to a purpose.
Bring the two together and the slogan resolves into something concrete. Precision in every drop is what links a single, carefully formed droplet to a stack that meets its emission targets day after day.
From a single drop to clean air
It's a satisfying through-line: the same obsession with the small detail that produces a flawless spray pattern is the obsession that produces a scrubber you can rely on. Get the droplet right, place it right, give it the right environment to react — and millions of them, working in concert, turn a dirty gas stream into one that's safe to release.
Two worlds, one principle. The nozzle perfects the drop. The scrubber gives it purpose. And clean air is what comes out the other side. Looking to improve the emission performance of your process, or to specify a scrubber engineered for your exact application? Talk to our engineers.
Frequently asked questions
How does a wet scrubber clean a gas stream?
The contaminated gas is passed through a curtain of atomized liquid. As the gas and spray meet, pollutants — soluble gases, fine particulates or aerosols — are absorbed or captured by the droplets and carried away, leaving a cleaner stream to exit the stack.
Why does droplet size matter so much in gas scrubbing?
Performance depends on the liquid surface area available to the gas. For a given volume of scrubbing liquid, smaller droplets create far more surface area, so more pollutant can transfer from gas to liquid. Droplet size is therefore the single biggest lever on scrubber efficiency.
Is a smaller droplet always better?
No. Very fine droplets have little mass, drift easily and can be swept out of the system (carryover) before they react. Every application has an optimum droplet size — fine enough for maximum contact, robust enough to stay where it's needed.
What makes Lechler's approach to scrubbing different?
Two kinds of precision working together: spray nozzles engineered to form exactly the right droplet, and scrubbers engineered around the real application — pollutant, gas flow, temperature, removal efficiency and the emission limits that have to be met.