Spray Tower

Short Product Introduction

An industrial spray tower is a vertical cylindrical vessel engineered for continuous gas-liquid contact to remove gaseous pollutants and fine particulates from industrial exhaust streams. Contaminated gas enters from the bottom, flows upward through atomized liquid sprays and structured packing, and exits purified from the top. Units are constructed from corrosion-resistant thermoplastic, fiber-reinforced plastic (FRP), or exotic alloys based on chemical and thermal load.

PP Spray Tower
The PP spray tower is a gas-liquid contact type waste gas treatment equipment fabricated by welding and assembling polypropylene (PP) plates. It consists of core components including a tower body,...
FRP Spray Tower
The FRP (Fiberglass Reinforced Plastic) spray tower is an efficient gas-liquid contact type waste gas treatment equipment. With FRP as the main material, it consists of core components including a...

Key Features

Counter-current or cross-flow gas-liquid contact mechanism maximizing interfacial mass transfer surface area.

Anti-clogging open-orifice or tangential whirl spray nozzles producing uniform 100 to 300-micron droplets.

Demister pad section installed at the tower outlet featuring a dual-stage chevron design to restrict liquid carryover below 15 mg/Nm3.

Integrated sump basin with sloped bottom and vortex breakers to prevent solids accumulation and cavitation in recirculation pumps.

Flanged inspection ports and manways positioned at nozzle headers and packing support beds for routine maintenance.

Product Configuration / Types

Empty Spray Tower:

Features multiple nozzle banks without packing; deployed for high-dust gas streams, heavy particulate scrubbing, or direct quenching where packed beds would foul.

Packed Bed Spray Tower:

Integrates structured or random packing (Pall rings, cascade mini-rings) to extend gas-liquid residence time; utilized for high-efficiency acid gas absorption (HCl, HF, SO2, NH3).

Multi-Stage Spray Tower:

Combines distinct reaction zones with independent chemical dosing loops to simultaneously neutralize acidic gases and scrub oxidizing contaminants.

How The Product Works

Gas Inlet: Exhaust gas enters the lower section of the tower through a tangential or straight-through flanged inlet transition.

Spray Zone: Liquid from the recirculation pump is pressurized through spray headers, generating a dense curtain of droplets moving counter-current to the gas flow.

Mass Transfer: Soluble gaseous pollutants transfer from the gas phase into the liquid droplet phase driven by concentration gradients.

Demisting: Treated gas passes through a droplet separator, removing entrained moisture before exiting the stack.

Reaction & Recirculation: Absorbed pollutants react with neutralizing reagents (e.g., NaOH) dosed into the lower sump. Liquid is continuously recycled back to the spray headers via corrosion-resistant centrifugal pumps.

Product Selection Guide

Gas Flow Rate:

Match internal column diameter to design volumetric flow, maintaining superficial gas velocities between 1.5 m/s and 3.0 m/s to prevent flooding or excessive pressure drop.

Liquid-to-Gas (L/G) Ratio:

Select circulation pump capacity based on required removal efficiency; typical absorption ratios range from 1.5 to 4.0 L/m3 for standard acid scrubbing.

Material Selection Matrix:

Fiberglass-Reinforced Plastic (FRP - Vinylester):

Standard for ambient temperature acidic gases (HCl, Cl2, H2SO4). Built to comply with ASME RTP-1 standards.

Polypropylene (PP) / Polyvinyl Chloride (PVC):

Suitable for lower temperature, corrosive chemical exhaust streams under 80°C.

Stainless Steel (316L / 904L) & Hastelloy:

Specified for high-temperature flue gases or organic solvent recovery systems.

Technical Specifications

Parameter	Specification Range	Unit
Gas Capacity	1,000 - 150,000	m3/h
Vessel Diameter	800 - 4,500	mm
Operating Pressure	-2,000 to +500	Pa
Pressure Drop	300 - 1,200	Pa
Removal Efficiency	Up to 99.2% (dependent on pollutant)	%
Operating Temperature	-10 to 120	°C
Power Supply	380V/415V, 50Hz/60Hz, 3-Phase	-

Typical Applications

Chemical manufacturing exhaust neutralization (HCl, HNO3, Cl2).

Semiconductor wet bench exhaust treatment (fluoride scrubbing meeting regional OSHA requirements).

Metallurgical pickling line acid fume control.

Waste incineration flue gas acid gas polishing.

Biomass boiler sulfur dioxide mitigation (engineered for ATEX compliance zones where applicable).

Engineering & Customization

CFD (Computational Fluid Dynamics) modeling provided for internal gas distribution optimization and velocity profile validation.
Seismic and wind load structural calculations executed according to ASCE 7, EN 1991, or local structural building codes for outdoor plant installations.
Custom nozzle array layouts configured for specific spray cone angles and complete wetting of cross-sectional area.
Integration of automated pH dosing skids, level transmitters, and PLC-controlled blowdown systems.

Manufacturing & Quality Control

FRP vessels fabricated via automated filament winding combined with hand lay-up structural reinforcement using corrosion-resistant resin rich layers (2.5 mm inner liner).

Thermoplastic components joined via certified extrusion and hot-gas welding operators holding DVS 2207 qualifications.

Hydrostatic pressure testing performed on all pressure vessels and piping headers at 1.5x design pressure prior to dispatch.

Raw material material test reports (MTRs) and resin cure hardness tests (Barcol hardness test >90% of manufacturer specification) supplied in QA data packages.

Installation / Integration Considerations

Mount the tower on a reinforced concrete foundation capable of supporting the operating weight including full liquid hold-up in the sump.
Maintain minimum straight-run duct clearances upstream of the gas inlet (at least 3x duct diameter) to ensure uniform velocity distribution.
Install flexible expansion joints on inlet and outlet ductwork and pump discharge lines to isolate mechanical vibration.
Ensure adequate vertical clearance above the vessel top flange for future internal demister pad and spray nozzle maintenance.

FAQ

Q: What is the maximum permissible particulate concentration in the inlet gas stream before packing clogs?

A: Packed bed towers require inlet dust loading to remain below 50 mg/Nm3 to prevent premature media fouling. For particulate concentrations exceeding this threshold, configure an open spray tower equipped with non-clogging tangential whirl nozzles or install a pre-scrubber stage such as a venturi scrubber.

Q: How is wastewater blowdown managed in continuous chemical scrubbing operations?

A: A side-stream automated blowdown valve, triggered by conductivity or pH sensors in the sump, purges saturated liquor to prevent salt precipitation and scaling. Fresh makeup water and chemical reagents are simultaneously injected via solenoid valves to maintain steady chemical concentration loops.

Q: What causes liquid droplet carryover into the exhaust stack, and how is it prevented?

A: Carryover occurs when the superficial gas velocity exceeds the design limit or when the demister pad becomes saturated or fouled. This is mitigated by sizing vessels to keep gas velocities below 3.0 m/s and installing dual-stage chevron demister blades that coalesce and drain moisture back into the active reaction zone.

Q: Can a single spray tower handle both acid gas removal and organic solvent scrubbing simultaneously?

A: No. Acid neutralization requires an alkaline aqueous solution (e.g., sodium hydroxide), whereas volatile organic compound (VOC) removal typically requires an oxidative scrub (e.g., sodium hypochlorite or hydrogen peroxide) or biological media. Multi-pollutant streams require separate, staged scrubbing columns with isolated recirculation loops.

Q: What is the standard design lifespan of an FRP spray tower operating in a hydrochloric acid environment?

A: An FRP tower fabricated with a premium vinyl ester resin and an adequate corrosion barrier layer delivers a design operational life of 15 to 20 years, provided internal chemical concentrations, operating temperatures, and structural vibration limits are maintained within specified parameters.

Q: How do you calculate the required recirculation pump head for the spray header system?

A: Pump total dynamic head (TDH) is determined by summing the spray nozzle operating pressure (typically 0.10 to 0.25 MPa), static elevation head from the liquid level in the sump to the highest spray header, frictional losses through piping, valves, and strainers, and pressure drop across the internal flow meters.

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