Converging Section (Inlet): Inlet Diameter 200-2000 mm

Component Specifications

Definition

The converging section, also known as the inlet or throat entry, is a critical component of a Venturi scrubber designed to gradually reduce the cross-sectional area of the gas stream. This geometric constriction accelerates the gas to high velocities (typically 60-120 m/s), creating intense turbulence and shear forces that atomize the scrubbing liquid into fine droplets, enabling efficient impaction and absorption of particulate matter and gaseous pollutants.

Working Principle

The converging section operates on the Venturi effect principle: as gas flows through a constricted area, its velocity increases while static pressure decreases. This acceleration creates kinetic energy that atomizes injected scrubbing liquid into micron-sized droplets, maximizing surface area for pollutant capture through inertial impaction, interception, and diffusion mechanisms.

Materials

316L stainless steel (corrosion-resistant), FRP (fiberglass reinforced plastic), PP (polypropylene), Hastelloy C-276 (for highly corrosive environments), ceramic-lined carbon steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pressure Drop	500-5000 Pa
Inlet Diameter	200-2000 mm
Design Velocity	60-120 m/s
Outlet Diameter	50-500 mm
Convergence Angle	12-25 degrees
Surface Roughness	Ra ≤ 3.2 μm
Length To Diameter Ratio	1.5:1 to 3:1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13341, DIN 24163, ASME B31.3

Parent Products

This component is used in the following industrial products

Venturi Scrubber

A wet scrubber that uses the Venturi effect to remove particulate matter and gaseous pollutants from industrial exhaust streams.

View Product Details

Engineering Analysis

Risks & Mitigation

Erosion from abrasive particulates
Corrosion from acidic gases
Fouling and buildup reducing efficiency
Structural fatigue from vibration

FMEA Triads

Trigger: Abrasive particulate erosion
Failure: Wall thinning and eventual perforation
Mitigation: Install wear-resistant linings, implement regular thickness monitoring, use hardened materials

Trigger: Corrosive gas exposure
Failure: Material degradation and leaks
Mitigation: Select corrosion-resistant alloys, apply protective coatings, implement pH monitoring of scrubbing liquid

Trigger: Improper convergence angle
Failure: Inefficient gas acceleration and poor scrubbing
Mitigation: Follow established design guidelines (15-20°), conduct CFD analysis, perform velocity profiling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% on critical dimensions, ±1° on convergence angle, surface finish Ra ≤ 3.2 μm

Test Method

Dimensional verification with laser scanning, pressure drop testing per ISO 5167, velocity profiling with pitot tubes, NDT for weld integrity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Converging Section (Inlet)

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Frequently Asked Questions

What is the optimal convergence angle for a Venturi scrubber inlet?

The optimal convergence angle is typically 15-20 degrees. Angles below 12 degrees cause insufficient acceleration, while angles above 25 degrees create excessive pressure drop and potential flow separation.

How does the converging section affect scrubbing efficiency?

The converging section determines gas velocity, which directly impacts droplet atomization. Higher velocities create smaller droplets with greater surface area, improving particulate capture efficiency through enhanced inertial impaction.

What materials are suitable for corrosive gas applications?

For highly corrosive environments, 316L stainless steel, Hastelloy C-276, or FRP with chemical-resistant linings are recommended to prevent degradation from acidic or alkaline gas streams.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Converging Section (Inlet)