Steam Reformer Catalyst Bed Layout for Low Pressure Drop

Solution Overview

Problem

Existing steam reforming catalysts face challenges with low overall catalyst active material, increased sensitivity to sulfur poisoning, and carbon formation due to higher hydrocarbon concentrations at higher temperatures, particularly in structured catalysts, which can lead to tube rupture and pressure drop issues.

Innovation Solution

A steam reformer design comprising a first catalyst bed in particulate form followed by a structured catalyst, where the feed gas first contacts the particulate bed to resist carbon formation and sulfur poisoning, while maintaining high feed flow rates and reducing pressure drop by using a down-flow configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stress or pressure

If structured catalyst is used to reduce pressure drop, then pressure drop is reduced, but catalyst active material amount decreases and sensitivity to sulfur poisoning increases

Engineering Contradiction:

Improvepressure dropVSAvoidsensitivity to sulfur poisoning

Core Design Contradiction:

Stress or pressureVSReliability

Solution Approach 1:

The catalyst system is segmented into two distinct parts: a structured catalyst element (monolithic support) and a particulate catalyst bed. The structured catalyst provides low pressure drop, while the particulate catalyst compensates for sulfur poisoning sensitivity, allowing each component to fulfill its specific function without compromise

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite catalyst system combining structured and particulate catalysts in one reactor. This composite approach integrates the advantages of both catalyst types: the structured catalyst's low pressure drop and the particulate catalyst's high sulfur tolerance and carbon formation resistance

Inventive Principle:

Principle #40Composite materials

2Stress or pressure

If structured catalyst is used, then pressure drop is reduced, but carbon formation risk increases due to lower catalyst active material

Engineering Contradiction:

Improvepressure dropVSAvoidcarbon formation

Core Design Contradiction:

Stress or pressureVSObject-generated harmful factors

Solution Approach 1:

The catalyst system is segmented into two distinct parts: a structured catalyst element (monolithic support) and a particulate catalyst bed. The structured catalyst provides low pressure drop, while the particulate catalyst compensates for sulfur poisoning sensitivity, allowing each component to fulfill its specific function without compromise

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention converts the potential harm of carbon formation into a benefit by using the particulate catalyst as a protective layer that preferentially forms carbon deposits, thereby protecting the structured catalyst from coking and maintaining its low pressure drop advantage throughout operation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If higher feed flow rates are used to increase productivity, then productivity increases, but carbon formation and tube rupture risk increase

Engineering Contradiction:

Improvefeed flow rateVSAvoidcarbon formation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The invention creates a composite catalyst system combining structured and particulate catalysts in one reactor. This composite approach integrates the advantages of both catalyst types: the structured catalyst's low pressure drop and the particulate catalyst's high sulfur tolerance and carbon formation resistance

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The combination of particulate and structured catalysts enhances resistance to sulfur poisoning and carbon formation, allowing for higher feed flow rates and reduced pressure drop, thus preventing tube rupture and maintaining efficient steam reforming operations.

Implementation Method 1

a first catalyst bed comprising a first catalyst in particulate form; and a second catalyst supported on a structure, wherein said first catalyst bed is located between said inlet and said second catalyst supported on said structure

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

The endothermic steam reforming reaction is typically carried out in a steam reformer

Methodology Applied

Scientific EffectEndothermic reaction: Endothermic Reaction

Implementation Method 3

Steam reforming a feed gas comprising hydrocarbons is a process which has been known for decades

Methodology Applied

Scientific EffectSteam reforming: Chemical Transport Reactions

Implementation Method 4

The heat for the endothermic reaction is supplied by combustion of fuels in burners in the furnace

Methodology Applied

Scientific EffectCombustion: Combustion

Data Source

PatentUS12565425B2Combination of structured catalyst elements and pellets

Publication Date: 2026.03.03 HALDOR TOPSOE AS

AI summary

A steam reformer is provided which comprises at least one externally-heated tube. Each tube comprises a first catalyst bed comprising a first catalyst in particulate form and a second catalyst supported on a structure, wherein said first catalyst bed is located between the inlet of the tube and the second catalyst supported on said structure. A process for steam reforming of a feed gas mixture using said steam reformer is also provided.