Catalytic Reforming System with Regenerated Catalyst Recycle

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Solution Overview

Problem

Catalytic reforming processes for hydrocarbons face efficiency decline due to coke deposition on catalysts, reducing catalytic activity and requiring multiple reactors with intermediate furnaces for reheating, which increases energy consumption.

Innovation Solution

Implementing a system with multiple reforming units in series and a catalyst regenerator, where used catalysts are regenerated and recycled to each reforming unit, maintaining catalytic activity and allowing direct bypass of effluents from one unit to the next, reducing the need for intermediate furnaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple reactors with intermediate furnaces are used to maintain catalytic activity, then the conversion rate of hydrocarbon feedstock is improved, but the energy consumption increases

Engineering Contradiction:

Improveconversion rateVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The catalyst circulation system is segmented into multiple circulation loops, with each loop serving a specific reactor. This allows independent optimization of catalyst flow and regeneration for each reactor unit, enabling efficient heat utilization without requiring intermediate furnaces between all reactors

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses the exothermic heat from coke combustion in the regenerator to preheat the catalyst before it enters the reforming reactors. This self-heating mechanism eliminates the need for external intermediate furnaces, maintaining conversion rates while reducing energy consumption

Inventive Principle:

Principle #25Self-service

2Reliability

If regenerated catalyst is supplied to each reforming unit, then the catalytic activity is maintained, but the system complexity increases

Engineering Contradiction:

Improvecatalytic activityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The catalyst regenerator serves multiple functions: it regenerates catalyst for all reforming units, preheats catalyst through exothermic combustion, and provides thermal energy to the system. This multi-functional design maintains catalytic activity across all units without proportionally increasing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The regenerator acts as an intermediary between spent catalyst from reactors and regenerated catalyst needed by reactors. It provides a centralized regeneration point that simplifies the overall system architecture compared to distributed regeneration at each unit

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If effluent is reheated in intermediate furnaces between reactors, then the reaction temperature is maintained, but the energy requirements increase

Engineering Contradiction:

Improvereaction temperatureVSAvoidenergy requirements

Core Design Contradiction:

TemperatureVSUse of energy by stationary object

Solution Approach 1:

The catalyst undergoes periodic cycles of spending in reactors (where it cools) and regeneration in the regenerator (where it is heated). This periodic heating of the catalyst creates thermal oscillations that can be utilized to maintain reaction temperatures without continuous external heating

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The catalyst experiences phase transitions in thermal state between the cold spent catalyst leaving reactors and the hot regenerated catalyst from the regenerator. This thermal phase transition provides the heat necessary for maintaining reaction temperatures in subsequent reactor stages

Inventive Principle:

Principle #36Phase transitions

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

This approach enhances the conversion rate of difficult-to-reform components, increases aromatic yields, and decreases energy requirements by maintaining catalytic activity and reducing the need for intermediate reheating.