Heat Exchanger Segmentation for Steam Methane Reforming Efficiency
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Solution Overview
Problem
The heat recovery in steam methane reforming processes is limited by process constraints such as pinch points in heat exchangers, leading to inefficient steam production and increased natural gas consumption.
Innovation Solution
An additional heat exchanger is introduced to preheat the natural gas feed stream using boiler feed water, allowing for improved heat exchange and maximizing steam production by increasing the temperature of the boiler feed water before it is used for heat recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional heat recovery configuration is used, then process simplicity is maintained, but thermal efficiency is limited due to pinch points
Solution Approach 1:
The heat recovery system is divided into multiple independent heat exchangers arranged in series. The first heat exchanger preheats the natural gas feed stream using waste heat from the product stream, and the second heat exchanger further heats the preheated gas. This segmentation allows each heat exchanger to operate within optimal temperature differences, avoiding pinch point limitations and maximizing overall thermal efficiency.
2Productivity
If additional heat exchangers are added to maximize heat recovery, then steam production increases, but device complexity increases
Solution Approach 1:
The heat exchangers in this system serve multiple functions: they recover waste heat from the product stream, preheat the natural gas feed stream, and ultimately heat the boiler feed water to generate steam. By designing the heat recovery system to perform these multiple functions in sequence, the patent maximizes steam production without requiring excessive additional equipment, as each heat exchanger contributes to multiple process objectives.
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 configuration enhances thermal efficiency, reduces natural gas consumption, and increases steam production while minimizing waste heat removal duty, resulting in improved operational expenditure and reduced potential for hydrate formation issues.
Implementation Method 1
exchanging heat between the product stream and the natural gas feed stream in a first heat exchanger
Implementation Method 2
preheating the natural gas feed stream using boiler feed water
Implementation Method 3
preheating the natural gas feed stream in a second heat exchanger to a third temperature
Implementation Method 4
exchanging heat between the product stream and a boiler feed water stream in a third heat exchanger
Implementation Method 5
increasing the temperature of the boiler feed water before it is used for heat recovery
Data Source
AI summary
An apparatus for improving thermal efficiency of steam production is provided. In one embodiment, the apparatus can include: a BFW heat exchanger in fluid communication with a hydrocarbon gas source and a boiler feed water source, wherein the BFW heat exchanger is configured to allow for the natural gas stream to exchange heat with the first BFW stream such that the hydrocarbon gas stream is pre-heated within the BFW heat exchanger and the BFW stream is cooled; a syngas production facility in fluid communication with the BFW heat exchanger, wherein the syngas production facility comprises a steam methane reformer (SMR) that is configured to convert natural gas within the hydrocarbon gas stream into a hot product stream comprising hydrogen and carbon monoxide, wherein the SMR comprises a plurality of burners; and a third heat exchanger in fluid communication with the first heat exchanger and the syngas production facility, wherein the third heat exchanger is configured to exchange heat between the hot product stream and the first BFW stream, thereby creating a hot BFW stream and a cooled product stream.