Oxycombustion Process for Vanadium Fuel Using Magnesium Mediator
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Solution Overview
Problem
Existing combustion processes for low-ranking fuels containing high vanadium levels face challenges in reducing fly ash, corrosion, and fouling at high temperatures, leading to inefficient energy recovery and environmental issues, with existing additives being ineffective at temperatures above 800°C and requiring frequent equipment cleaning.
Innovation Solution
An oxycombustion process using magnesium as an oxide or water-soluble salt, operating at 1250-1450°C with oxygen and steam, transforms vanadium into stable orthovanadates and pyrovanadates, reducing corrosive species and fly ash formation, and allowing continuous energy recovery for up to 8000 hours without significant fouling or emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional combustion processes are used for low-ranking fuels containing high vanadium levels, then energy recovery can be achieved, but fly ash content increases and corrosion/fouling occurs at high temperatures
Solution Approach 1:
Magnesium acts as an intermediary substance that transforms corrosive vanadium species into stable orthovanadates and pyrovanadates. The magnesium compounds (oxide or water-soluble salt) introduced into the combustion zone react with vanadium to form non-corrosive products, mediating between the harmful vanadium and the equipment to prevent damage while maintaining energy recovery efficiency
Solution Approach 2:
The combustion temperature is optimized to the range of 1250-1450°C, which is higher than conventional processes. This parameter change enables complete transformation of vanadium into stable compounds while reducing fly ash formation. The elevated temperature ensures thorough reaction of magnesium with vanadium species and promotes efficient combustion of low-ranking fuels
2Reliability
If existing additives are used to reduce corrosion, then some protection is achieved, but they become ineffective at temperatures above 800°C and require frequent equipment cleaning
Solution Approach 1:
The combustion temperature is elevated to 1250-1450°C, exceeding the effectiveness range of conventional additives (above 800°C). This parameter change enables the magnesium-based system to form stable orthovanadates and pyrovanadates that remain effective at high temperatures, eliminating the need for frequent cleaning and extending equipment operation time
Solution Approach 2:
The system uses magnesium compounds (oxide or water-soluble salt) that form composite stable compounds with vanadium (orthovanadates and pyrovanadates). These composite materials exhibit high thermal stability and corrosion resistance at temperatures above 800°C, unlike conventional single-component additives
3Use of energy by moving object
If heavy hydrocarbon fractions containing vanadium are used as fuel, then energy recovery is possible, but technological complexity and operation costs increase due to corrosion and fouling
Solution Approach 1:
Magnesium compounds serve as an intermediary that simplifies the combustion process of heavy hydrocarbon fractions. By introducing magnesium oxide or water-soluble salt, the system transforms complex vanadium-containing fuels into stable orthovanadates and pyrovanadates, eliminating the need for complex pre-treatment or post-processing equipment and reducing operational complexity
Solution Approach 2:
The harmful vanadium components are effectively extracted from the combustion system through reaction with magnesium. The vanadium is removed from the flue gas stream in the form of stable orthovanadates and pyrovanadates, preventing corrosion and fouling of downstream equipment, thereby simplifying the overall plant configuration
4Power
If combustion temperature is increased to improve energy recovery efficiency, then energy recovery improves, but corrosion and fouling from vanadium compounds worsen
Solution Approach 1:
The harmful effect of high temperature on vanadium (increased corrosion and fouling) is converted into a benefit. By introducing magnesium compounds, the high temperature promotes complete reaction of vanadium to form stable orthovanadates and pyrovanadates, which are non-corrosive. The previously harmful high temperature becomes advantageous for achieving complete transformation of vanadium species
Solution Approach 2:
Magnesium acts as a protective intermediary that allows high-temperature combustion to proceed without the harmful effects of vanadium corrosion. The magnesium compounds react with vanadium at elevated temperatures to form stable products, mediating between the high-temperature combustion process and the equipment to enable efficient energy recovery without corrosion damage
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 process achieves low fly ash content, negligible incombustible residues, and reduced vanadium emissions, preventing corrosion and fouling, enabling high-energy efficiency and extended equipment lifespan with minimal maintenance, while producing flue gases free from soot and toxic compounds.
Implementation Method 1
transforms vanadium into stable orthovanadates and pyrovanadates
Implementation Method 2
An oxycombustion process using magnesium as an oxide or water-soluble salt, operating at 1250-1450°C with oxygen and steam
Implementation Method 3
combustors working at temperatures in the range 1250°-1450°C
Data Source
AI summary
Oxycombustion process wherein low ranking, gaseous, liquid, solid, optionally solid melting hydrocarbon fractions are used as fuels, having a vanadium content in an amount by weight from 50 to 5,000 ppm or higher, for producing energy, wherein magnesium is added as oxide, or as a water- soluble salt, the combustor being refractored and isotherm or quasi isotherm, flameless, working at temperatures comprised between 1,250°C and 1,450°C and under pressurized conditions, wherein the oxidant is oxygen, the oxidant being used in admixture with water or steam such that the ratio by moles oxidant: (water-steam) is comprised between about 1:0,4 and about 1:3 or the oxidant is used in admixture with flue gases recycled from the flue gases outletting the energy recovery equipments, wherein the water amount is higher than 30% by volume, optionally by adding water, the molar ratio oxidant: (water/steam) in flue gases being comprised from about 1:0.4 to about 1:3; the low ranking hydrocarbon fraction containing vanadium is fed in admixture with water or steam, such that the amount of water/steam in the mixture is at least 30% by weight with respect to the hydrocarbon fraction.