Water Gas Shift Unit Steam Superheater Heat Management
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Solution Overview
Problem
Existing syngas conversion processes face inefficiencies in heat management and catalyst startup, leading to potential thermal runaways and increased capital costs due to reliance on auxiliary heaters.
Innovation Solution
A process utilizing a water gas shift reactor with dual heat exchanger modes to efficiently transfer heat from shifted syngas streams for steam superheating and preheating, and additional modes for catalyst activation and sulfurization, reducing the need for auxiliary heaters and enhancing safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single heat exchanger is used for steam superheating during normal operation, then steam production efficiency is improved, but the system lacks the capability to preheat gases for catalyst startup and sulfurization
Solution Approach 1:
The patent implements a heat exchanger that can operate in multiple modes: steam superheating mode during normal operation, and gas preheating mode during catalyst startup and sulfurization. The same heat exchanger hardware serves different functional purposes by switching fluid pathways, eliminating the need for separate auxiliary heating equipment while maintaining operational versatility.
Solution Approach 2:
The system dynamically reconfigures the heat exchanger operation based on process needs. During normal operation, the heat exchanger operates in steam superheating mode; during catalyst activation phases, it switches to preheating synthesis gas or circulation gas. This dynamic adaptability allows a single device to fulfill multiple process requirements.
2Reliability
If auxiliary heaters are used for catalyst startup and sulfurization, then catalyst activation is achieved, but capital costs increase
Solution Approach 1:
The system uses its own process heat to accomplish catalyst startup and sulfurization without external auxiliary heaters. The heat exchanger utilizes thermal energy from the shifted syngas stream to preheat the synthesis gas or circulation gas during catalyst activation, making the system self-sufficient and eliminating capital expenditure on separate heating equipment.
Solution Approach 2:
The patent combines the catalyst activation function with the existing heat exchanger used for steam superheating. By merging the preheating function into the same heat exchanger, the system eliminates the need for separate auxiliary heaters, reducing capital costs while maintaining the ability to reliably activate catalysts.
3Loss of energy
If process heat is not efficiently utilized during catalyst startup, then simple operation is maintained, but thermal runaways may occur and energy efficiency decreases
Solution Approach 1:
The system implements temperature monitoring and control during catalyst startup and sulfurization operations. Temperature sensors monitor the synthesis gas or circulation gas as it passes through the heat exchanger, and this feedback is used to adjust the heating process, preventing thermal runaways while maximizing heat utilization efficiency during these critical phases.
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 optimizes heat utilization, reduces the risk of thermal runaways, and lowers capital costs by repurposing heat exchangers for various operational modes, ensuring stable and efficient syngas conversion.
Implementation Method 1
transferring heat from a warm shifted syngas stream to the syngas stream in a first heat exchanger to produce the shifted syngas stream and a heated syngas stream
Implementation Method 2
transferring heat from the hot shifted syngas stream to a steam stream in a second heat exchanger to produce the warm shifted syngas stream and a superheated steam stream
Implementation Method 3
transferring heat from a preheating fluid to the partially shifted syngas stream in the second heat exchanger to produce a cooled preheating fluid and the hot partially shifted syngas stream
Data Source
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AI summary
A method and system for converting a syngas stream to a shifted syngas stream in a shift reactor comprising a first mode of operation and a second mode of operation. The first mode of operation uses heat from the shifted syngas stream to superheat steam in a heat exchanger. The second mode of operation uses the same heat exchanger to heat a partially shifted syngas stream while the shift reactor is heating up to a normal operating temperature.