Pingxiang Daier 92% Al₂O₃ Ceramic Balls: Catalyst Bed Support Solution for Refinery & Petrochemical

Catalyst Bed Support: The Engineering Challenge

In every fixed-bed reactor—whether a hydrotreater, reformer, or shift converter—the catalyst bed sits atop a support system that must perform three simultaneous functions:

• Mechanical support — bearing the full weight of the catalyst bed without deformation or collapse

• Fluid distribution — ensuring uniform gas/liquid flow across the entire bed cross-section

• Contamination prevention — keeping catalyst fines and debris from migrating downstream

The support layer is not an accessory. It is a critical engineering interface that directly impacts catalyst life, pressure drop, and process stability.

Why High Alumina Ceramic Balls

Among all support media options—ceramic saddles, metal grids, and various ball types—high alumina ceramic balls (Al₂O₃ ≥ 92%) are the industry standard for most refinery and petrochemical reactors.

The reason is straightforward:

High alumina content translates directly to higher mechanical strength, superior thermal shock resistance, and lower leachable silica — a critical factor in preventing downstream catalyst poisoning.

Core Functions in the Reactor

1. Catalyst Bed Support and Covering

In reactors such as hydrotreaters, catalytic reformers, isomerization units, and methanators, ceramic balls are laid as the bottom support layer beneath the catalyst, and often as a top covering layer above it.

2. Fluid Redistribution

The spherical shape and uniform size of ceramic balls create consistent void spaces that redistribute gas and liquid flows entering the reactor. Poor distribution leads to channeling, hot spots, and reduced catalyst utilization.

3. Particle Filtration

The graded layers of ceramic balls trap catalyst fines and process debris, preventing them from fouling downstream heat exchangers, pumps, and instrumentation.

Graded Bed Design: A Matter of Engineering

A properly designed support bed uses multiple ceramic ball sizes in graded layers:

This graded configuration achieves three objectives:

• Distributes the catalyst load evenly to the support grid

• Prevents catalyst migration into lower layers

• Minimizes pressure drop across the support system

Installation Protocol

Proper installation is as important as product quality:

1. Mark fill height lines inside the reactor per engineering drawings

2. Install the bottom support grid (support plate or grid)

3. Fill larger-diameter balls (50–75 mm) to the first mark

4. Add intermediate sizes in sequence, leveling each layer

5. Complete with the finest size (6–13 mm) adjacent to the catalyst bed

6. Install the catalyst bed above the support layer

Critical note: Balls must be poured gently to avoid chipping. Ceramic breakage generates fines that can clog the bed and increase pressure drop.

DAIER 92% High Alumina Ceramic Balls: Engineered for Refinery Service

Manufactured in Pingxiang, Jiangxi, China — the country's industrial ceramic hub — Pingxiang Daier's 92% high alumina ceramic balls are engineered specifically for catalyst bed support applications in:

• Hydrotreaters 

• Catalytic reformers 

• Shift converters 

• Desulfurizers

• Methanators 

• FCC units 

Technical specifications:

Available sizes: Φ3mm, Φ6mm, Φ8mm, Φ10mm, Φ13mm, Φ16mm, Φ19mm, Φ25mm, Φ30mm, Φ38mm, Φ50mm, Φ65mm, Φ70mm, Φ75mm — covering the full graded bed requirement.

Quality Assurance: The DAIER Difference

• ISO 9001:2015 certified manufacturing

• Batch-level Al₂O₃ content verification — guaranteed ≥ 92%, eliminating the risk of receiving medium-alumina product

• Full physical testing per batch: crush strength, bulk density, water absorption

• Batch traceability from raw material to finished product

• Third-party inspections (SGS, TÜV) available upon request

Selection Support

DAIER's engineering team provides size recommendations and loading volume calculations based on your reactor diameter, bed height, operating temperature, and process medium.