Solar Biomass Gasification Quench for Clean Syngas and Ash Control
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Solution Overview
Problem
Biomass gasification processes typically require 30-40% of the biomass to be consumed for energy, limiting conversion efficiency and yields, whereas solar-driven biorefineries use external renewable energy, reducing biomass consumption and enhancing yields.
Innovation Solution
A solar-driven chemical plant with a solar thermal receiver and multiple reactor tubes for gasifying biomass, followed by a quench zone for rapid cooling of reaction products to prevent metal dusting and ash coalescence, and an on-site fuel synthesis reactor to convert syngas into liquid hydrocarbon fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If biomass is used as fuel to drive the gasification process, then the process can be self-sustaining, but 30-40% of biomass must be consumed limiting conversion efficiency and yields
Solution Approach 1:
The patent extracts the energy source function from biomass by introducing an external solar energy source. The solar receiver and heat transfer fluid system separate the energy provision function from the biomass feedstock, allowing biomass to be used solely as feedstock for gasification without needing to sacrifice 30-40% of it for energy generation.
Solution Approach 2:
The patent introduces a heat transfer fluid (HTF) as an intermediary between the solar energy source and the gasification reactor. The HTF absorbs concentrated solar energy in the solar receiver and transports thermal energy to the reactor, enabling external energy input without direct biomass combustion for heat generation.
2Productivity
If high temperature is maintained for efficient gasification, then conversion efficiency improves, but metal dusting and ash coalescence problems occur
Solution Approach 1:
The patent applies preliminary action by rapidly cooling the syngas immediately upon exiting the reactor through a quench zone. This sudden temperature reduction prevents metal dusting and ash coalescence from occurring during gas transport, while still allowing high temperature operation during the gasification reaction itself.
Solution Approach 2:
The patent uses a quench zone that rapidly reduces temperature within 0.1-10 seconds of reactor exit. This rapid cooling 'skips' through the dangerous temperature range where metal dusting and ash coalescence occur, transitioning the syngas from high temperature to protective low temperature almost instantaneously.
3Object-affected harmful factors
If rapid cooling is applied to prevent metal dusting, then product quality improves, but reaction products may revert to other compounds
Solution Approach 1:
The patent applies preliminary action by rapidly cooling the syngas immediately upon exiting the reactor through a quench zone. This sudden temperature reduction prevents metal dusting and ash coalescence from occurring during gas transport, while still allowing high temperature operation during the gasification reaction itself.
Solution Approach 2:
The patent uses a quench zone that rapidly reduces temperature within 0.1-10 seconds of reactor exit. This rapid cooling 'skips' through the dangerous temperature range where metal dusting and ash coalescence occur, transitioning the syngas from high temperature to protective low temperature almost instantaneously.
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 achieves higher gasoline yields from biomass, utilizing renewable energy and minimizing biomass consumption, while producing clean syngas with reduced tar and sulfur levels, enabling efficient conversion to liquid fuels.
Implementation Method 1
absorb concentrated solar energy from one or more solar energy concentrating fields
Implementation Method 2
solar-driven chemical reactor may have multiple reactor tubes located inside the solar thermal receiver
Implementation Method 3
The quench zone can immediately quench via rapid cooling of at least the hydrogen and carbon monoxide reaction products
Data Source
AI summary
A method, apparatus, and system for a solar-driven chemical plant are disclosed. An embodiment may include a solar thermal receiver aligned to absorb concentrated solar energy from one or more solar energy concentrating fields. A solar driven chemical reactor may include multiple reactor tubes located inside the solar thermal receiver. The multiple reactor tubes can be used to gasify particles of biomass in the presence of a carrier gas. The gasification reaction may produce reaction products that include hydrogen and carbon monoxide gas having an exit temperature from the tubes exceeding 1000 degrees C. An embodiment can include a quench zone immediately downstream of an exit of the chemical reactor. The quench zone may immediately quench via rapid cooling of at least the hydrogen and carbon monoxide reaction products within 0.1-10 seconds of exiting the chemical reactor to a temperature of 800 degrees C. or less.