Venturi Scrubber Diverging Section (Outlet)

Product Specifications

Technical details and manufacturing context for Diverging Section (Outlet)

Definition

The diverging section, located at the outlet of a Venturi scrubber, is a conical or gradually expanding duct designed to slow down the high-velocity gas-liquid mixture exiting the throat. This deceleration converts kinetic energy back into pressure energy (pressure recovery), reducing overall system pressure drop. It also promotes droplet separation from the gas stream through centrifugal force and impaction, enhancing particulate and pollutant removal efficiency before the gas exits the scrubber. The component is typically fabricated from materials such as stainless steel (e.g., 304, 316), carbon steel, fiber-reinforced plastic (FRP), or polypropylene (PP), depending on the application's corrosion and temperature requirements. Key parameters include outlet diameter (200–1200 mm, matching inlet duct size), divergence angle (5–15° for optimal pressure recovery), length (500–3000 mm, depending on angle and diameter), wall thickness (6–20 mm for carbon steel, per GB/T 709), operating pressure (0.1–1.0 MPa, flange rating per GB/T 9115), operating temperature (-20 to 200°C, material dependent), material grade (Q235B/304/316L, per GB/T 700 and ASTM A240), surface roughness (Ra 3.2–6.3 μm, per GB/T 1031), weight (50–800 kg, depending on size), and flange standard (PN10/PN16, per GB/T 9115). These values are reference ranges for directory purposes and must be confirmed for the specific model and application with the legal manufacturer or supplier. The diverging section is a critical component for energy efficiency and particulate removal in Venturi scrubber systems, and its design must be matched to the overall system requirements.

Working Principle

As the gas-liquid mixture enters the diverging section from the narrow throat, the cross-sectional area increases, causing the gas velocity to decrease according to the continuity equation (A1V1 = A2V2). This deceleration reduces dynamic pressure and increases static pressure (Bernoulli's principle). The reduced velocity allows larger droplets to settle or be separated by inertial forces, while the pressure recovery minimizes energy consumption of the exhaust fan. The geometry, particularly the divergence angle, must be optimized to balance pressure recovery against potential flow separation and increased turbulence, which could reduce efficiency.

Common Materials

Stainless Steel (e.g., 304, 316), Carbon Steel, Fiber-Reinforced Plastic (FRP), Polypropylene (PP)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Outlet Diameter	200–1200 mm	Matches inlet duct size
Divergence Angle	5–15 °	Optimal pressure recovery
Length	500–3000 mm	Depends on angle and diameter
Wall Thickness	6–20 mm	For carbon steelGB/T 709
Operating Pressure	0.1–1.0 MPa	Flange ratingGB/T 9115
Operating Temperature	-20–200 °C	Material dependent
Material Grade	Q235B/304/316L	Corrosion resistanceGB/T 700, ASTM A240
Surface Roughness	Ra 3.2–6.3 μm	Internal finishGB/T 1031
Weight	50–800 kg	Depends on size
Flange Standard	PN10/PN16	Mating flangesGB/T 9115

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

Components / BOM

Flange Connection Part
Connects diverging section to downstream ducting or separation equipment

Material: Same as main body (e.g., stainless steel)
Reinforcement Rings Part
Provides structural support to prevent deformation under pressure

Material: Steel
Drain Port Optional Part
Optional port for draining collected liquid from the section

Material: Stainless steel or plastic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Venturi Scrubber

View system integration details

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Frequently Asked Questions

What is the primary function of the diverging section in a Venturi scrubber?

The diverging section slows down the high-velocity gas-liquid mixture exiting the throat, converting kinetic energy into pressure energy (pressure recovery). This reduces overall system pressure drop and promotes droplet separation, enhancing particulate removal efficiency.

What materials are commonly used for the diverging section?

Common materials include stainless steel (e.g., 304, 316), carbon steel, fiber-reinforced plastic (FRP), and polypropylene (PP). The choice depends on the application's corrosion, temperature, and mechanical requirements.

What are typical design parameters for the diverging section?

Typical parameters include outlet diameter (200–1200 mm), divergence angle (5–15°), length (500–3000 mm), wall thickness (6–20 mm for carbon steel), operating pressure (0.1–1.0 MPa), and operating temperature (-20 to 200°C). These are reference ranges and must be confirmed for the specific model.

How does the divergence angle affect performance?

The divergence angle influences pressure recovery and flow stability. An optimal angle (typically 5–15°) maximizes pressure recovery while minimizing flow separation and turbulence. Too large an angle can cause flow separation, reducing efficiency and increasing pressure drop.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar (gauge)
flow rate:	0.5 to 50 m³/s (gas)
temperature:	-20°C to 150°C
slurry concentration:	Up to 15% solids by weight

Diverging Section (Outlet)

Product Specifications

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