Description
Who Needs This Horizontal Wet Scrubber?
If your facility needs effective gas scrubbing but ceiling height or indoor space is limited — this horizontal crossflow scrubber is purpose-built for you. A wet scrubber is a pollution control device that uses a liquid to remove pollutants from exhaust streams by absorption — and this horizontal design achieves that in a low-profile package. For a detailed engineering framework on choosing between orientations, see our guide: Vertical vs Horizontal Wet Scrubber Selection (2026). If your exhaust contains hydrogen chloride (HCl), OSHA classifies it as a hazardous chemical requiring proper emission control. Our horizontal scrubber handles HCl, H₂SO₄, NH₃, and water‑soluble VOCs effectively.
Typical installation scenarios:
- Indoor production workshops with ceiling restrictions
- Rooftop installations requiring a low-profile air pollution control system
- Basement or confined utility rooms in chemical processing plants
- Laboratory exhaust treatment where vertical towers cannot fit
- Retrofitting into existing cramped ventilation systems
This scrubber is specifically optimized for low‑headroom installations (3,000 – 45,000 m³/h) where horizontal crossflow design eliminates the need for tall vertical structures. For applications with sufficient ceiling height, our vertical exhaust gas wet scrubber offers an alternative configuration with counter‑current flow for maximum absorption. The compact layout integrates the absorption tower, recirculation tank, and mist eliminator in a single horizontal housing — saving valuable floor space. It is not recommended for high‑temperature exhaust (>70°C) or heavy dust‑laden streams without pre‑filtration — in those scenarios, we suggest a cyclone pre‑stage.
Why Engineers Choose Our Horizontal Crossflow Scrubber
1. Horizontal Crossflow Design = Fit Where Verticals Cannot
The horizontal gas flow path with vertical liquid distribution significantly reduces overall equipment height. In a recent installation at a chemical laboratory with only 2.6 m ceiling clearance, our horizontal scrubber was installed directly inside the workspace without structural modifications. Vertical towers were simply not an option. The crossflow design allows all core components — packing, spray nozzles, mist eliminator — to be accessible at ground level, dramatically reducing maintenance time. Refer to our engineering deep-dive on why scrubber work fails and how PP material prevents it.
2. Dual‑Layer Spray + Mist Eliminator for Higher Absorption
Unlike single‑stage designs, our system features two spray layers followed by a dedicated mist elimination section. This staged approach increases gas‑liquid contact time without requiring additional tower height — achieving absorption performance comparable to taller vertical units. The PP polyhedral hollow ball packing inside creates extensive gas‑liquid contact area, boosting purification efficiency while reducing pressure drop. Horizontal crossflow scrubbers like those described by Tholander Ablufttechnik demonstrate that cross‑flow geometry can achieve high removal rates with efficient fresh water supply and chemical dosing.
3. Integrated Sump Tank = No External Plumbing Complexity
The recirculation tank is built directly into the housing, eliminating the need for separate external tanks, additional piping, and complex site preparations. Simply connect inlet/outlet ducting, fill the sump, and power on.
4. PP Polypropylene Construction Withstands Corrosive Environments
The shell, packing support, and liquid distribution components are fabricated from virgin PP sheet — proven in Southeast Asian chemical plants to maintain structural integrity for over 8 years under continuous HCl and H₂SO₄ exposure. For a comprehensive guide on keeping your system running long‑term, see our acid scrubber maintenance guide: prevent corrosion, scaling & downtime.
Field case snapshot (Singapore laboratory): 5,000 m³/h horizontal scrubber installed under 2.6 m ceiling for H₂SO₄ mist removal. Dual‑layer spray configuration. Result: outlet concentration well below local regulatory limits.
Technical Specifications
| Air Volume (m³/h) | Housing Size (mm) | Shell THK (mm) | Drain Outlet (mm) | Sump Tank (mm) | Inlet/Outlet Dia. (mm) | Pump (kW) | Wind Resist. (Pa) |
|---|---|---|---|---|---|---|---|
| 3,000 | 800 | 8 | DN32 | 600×700×H700 | 315 | 0.75 | 500 |
| 5,000 | 1,000 | 8 | DN40 | 600×800×H700 | 400 | 1.5 | 500 |
| 8,000 | 1,200 | 8 | DN40 | 600×1000×H700 | 500 | 2.2 | 500 |
| 10,000 | 1,500 | 10 | DN40 | 700×1000×H700 | 550 | 2.2 | 500 |
| 12,000 | 1,600 | 10 | DN50 | 700×1000×H700 | 600 | 3.75 | 500 |
| 15,000 | 1,800 | 10 | DN50 | 700×1200×H700 | 650 | 3.75 | 500 |
| 20,000 | 2,000 | 10 | DN50 | 700×1200×H700 | 750 | 5.5 | 500 |
| 25,000 | 2,200 | 10 | DN50 | 700×1200×H700 | 950 | 5.5 | 600 |
| 30,000 | 2,500 | 12 | DN65 | 700×1200×H700 | 1,000 | 5.5 | 600 |
| 35,000 | 2,700 | 12 | DN65 | 1000×700×H700 | 1,100 | 7.5 | 600 |
| 40,000 | 2,900 | 12 | DN65 | 1000×700×H700 | 1,200 | 7.5 | 600 |
| 45,000 | 3,000 | 12 | DN65 | 1000×700×H700 | 1,250 | 7.5 | 600 |
Standard configuration includes: horizontal housing, dual‑layer spray system, PP packing media, mist eliminator, integrated recirculation sump. Custom dimensions, multi‑stage configurations, and accessories (pH control, level sensors) available upon request.
Frequently Asked Questions
Q1: What is the difference between a horizontal and vertical wet scrubber?
Horizontal scrubbers route gas laterally through packing while scrubbing liquid flows downward (crossflow), minimizing overall height. Vertical scrubbers route gas upward against descending liquid (countercurrent), achieving slightly higher absorption per unit packing depth but requiring more headroom. Choose horizontal when ceiling height is limited or a low rooftop profile is required. For a complete engineering comparison with removal chemistry and life‑cycle economics, read our detailed guide: Vertical vs Horizontal Wet Scrubber Selection (2026).
Q2: What gases can this horizontal scrubber treat?
Engineered for water‑soluble acid gases (HCl, HF, H₂SO₄, CrO₃, HCN, H₂S, SO₂), alkali gases (NH₃, NaOH fumes), and select organic vapors (HCHO, low‑concentration water‑soluble VOCs). Scrubbing liquid chemistry must be matched to the target gas — we provide recommendations during quotation.
Q3: What removal efficiency can I expect?
Under design conditions (1.8 m/s crossflow velocity, matched scrubbing liquid), single‑stage removal efficiency exceeds 95% for highly soluble gases such as HCl and NH₃. According to the U.S. EPA, wet scrubber performance for gaseous control depends on pressure differential, liquid flow rate, and scrubber liquid outlet concentration, all of which are optimized in our design. Studies show industrial wet scrubbers consistently achieve 90–99% removal for acid gas applications.
Q4: Does the horizontal orientation reduce performance?
For most water‑soluble gases, horizontal crossflow scrubbers achieve comparable absorption to vertical designs. The two‑stage spray configuration in our design compensates for any slight reduction in contact efficiency. For highly soluble gases like HCl and NH₃, both configurations achieve 95–99% removal. In applications where headroom is constrained, horizontal scrubbers are the only viable packed‑bed option. The Tholander crossflow scrubber similarly demonstrates that horizontal designs deliver low pressure loss, low pump power, and efficient chemical dosing.
Q5: How do I select the right model size?
Match your exhaust volume (m³/h) to the nearest standard model in the specification table above. If your volume falls between two models, we recommend selecting the larger one for future expansion. For a step‑by‑step sizing methodology with real‑world engineering examples, see our guide: Scrubber Sizing Calculation: Step‑by‑Step Design & Optimization. Provide process data (gas composition, temperature, concentration) to our engineering team for a detailed sizing verification.
Q6: What are the installation requirements?
Install on a level, corrosion‑resistant pad indoors or under weather cover. Maintain at least 1 m clearance at the front for pump and spray nozzle access. Inlet and outlet ducting must be properly supported and match flange dimensions in the specification table. Outdoor installations require rain covers for the pump and fan motors.
Q7: What maintenance is required?
A well‑designed maintenance schedule prevents corrosion, scaling, and downtime. We recommend:
Weekly: Check spray nozzle patterns and packing condition
Monthly: Test scrubbing liquid pH and replenish as needed
Quarterly: Inspect mist eliminator for scaling
Annually: Full packing inspection, replace degraded media
For a complete tiered inspection schedule with chemical management strategies, refer to our Acid Scrubber Maintenance Guide: Prevent Corrosion, Scaling & Downtime.
Q8: What are the most common operating issues?
The most frequent problem encountered in the field is packing clogging caused by debris‑laden gas or contaminated scrubbing liquid. Low removal efficiency often traces to insufficient scrubbing liquid concentration or spray nozzle blockage. High pressure drop typically indicates solids accumulation in the packing — clean or replace affected media. Our analysis of scrubber work failure and PP material prevention shows that PP construction eliminates shell corrosion, pinhole leaks, and internal surface roughness issues that plague metallic scrubbers.
Q9: What is the expected service life?
PP housing: 8–12 years under normal corrosive conditions. Packing media replacement: 3–5 years depending on gas type and temperature. Pump mechanical seals: inspect annually. PP material is inherently immune to the corrosion mechanisms that limit metallic scrubbers to 2–4 years in acid gas service.
Q10: Is this scrubber compliant with emission regulations?
Our scrubbers are designed to help you meet local environmental standards. The EPA monitoring requirements for wet scrubbers specify continuous or periodic checks of pressure differential, liquid flow rate, and outlet concentration — all parameters our system is engineered to maintain. Achievable outlet concentration depends on inlet loading and scrubbing liquid chemistry. Our engineering team can provide projected outlet emission estimates based on your process data.
Q11: What scrubbing liquid should I use?
HCl / H₂SO₄ → NaOH solution (10–15%) or lime slurry. H₂S → NaOH + NaOCl oxidizing solution. NH₃ → H₂SO₄ (5–10%). HCHO / VOCs → Water with surfactant or oxidizing additive. Exact concentration recommendations are provided during specification.
Q12: What is the standard lead time?
Standard models ship within 15–25 working days; custom configurations may require additional time. We ship FOB/CIF from our factory in China to major ports worldwide.
About the Author & Our Expertise
Product specifications reviewed by: Corbin Deng, Process Engineer, XICHENG EP LTD — 12+ years in industrial waste gas treatment and wet scrubber system design.
About XICHENG EP LTD
XICHENG EP LTD specializes in PP polypropylene waste gas treatment equipment, serving chemical, electroplating, pharmaceutical, and laboratory industries across 30+ countries. Our horizontal scrubbers have been installed in confined‑space applications throughout Southeast Asia and the Middle East. With over 500 installations worldwide, our engineering team brings real‑world commissioning data to every specification.
Installation References
- Chemical laboratory, Singapore — 5,000 m³/h horizontal scrubber installed under 2.6 m ceiling, H₂SO₄ mist removal
- Electroplating workshop, Vietnam — 12,000 m³/h unit treating CrO₃ & HCN exhaust since 2020
- Pharmaceutical R&D facility, Thailand — Dual‑stage horizontal scrubber for mixed solvent vapors
Certifications: ISO 9001:2015 (Quality Management) | ISO 14001 (Environmental Management). Material certificates and inspection reports available upon request.
All photos on this page are of actual XICHENG manufacturing, packing, and installation sites, taken in 2024–2025.
