High-Temperature Sorbent for Acid Gas Neutralization
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Solution Overview
Problem
Current methods for controlling emissions in combustion processes, particularly in waste incineration plants, face challenges such as excessive sorbent dosage, inefficient neutralization of acid pollutants, and corrosion issues due to the variability of waste composition and temperature-dependent sorbent effectiveness.
Innovation Solution
A sorbent composition in powder form comprising calcium hydroxide, magnesium hydroxide, and magnesium oxide with a specific surface area greater than 20 m²/g, optimized for high-temperature treatment (800°C - 1400°C), which is injected into the gaseous effluent to effectively neutralize sulfurated compounds and hydrohalogen acids, reducing sintering effects and enhancing porosity for improved pollutant capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alkaline sorbents (hydrated lime or sodium bicarbonate) are used in low-temperature systems, then neutralization of acid pollutants can be achieved, but excessive sorbent dosage is required and neutralization efficiency is reduced
Solution Approach 1:
The invention changes the operating temperature parameter from low-temperature (110-250°C) to high-temperature (800-1400°C) range, which fundamentally alters the chemical reactivity of the sorbent material. At high temperatures, the sorbent exhibits enhanced neutralization capability, allowing effective pollutant removal with significantly reduced dosage compared to conventional low-temperature systems
Solution Approach 2:
The invention uses a composite sorbent material comprising calcium hydroxide, magnesium hydroxide, and magnesium oxide in specific proportions. This composite formulation synergistically combines the neutralization properties of different alkaline compounds, improving overall neutralization efficiency while reducing the total quantity of sorbent needed
2Reliability
If high temperatures (800°C - 1400°C) are used for sorbent treatment, then neutralization efficiency is improved and sorbent dosage is reduced, but sintering effects may occur
Solution Approach 1:
The invention optimizes the temperature parameter within a specific high-temperature range (800-1400°C) to achieve effective neutralization while controlling sintering. By precisely controlling the temperature parameter and exposure time, the sorbent maintains its structural stability and porosity necessary for continuous operation
Solution Approach 2:
The invention utilizes a porous sorbent structure with specific surface area and pore volume characteristics that resist sintering at high temperatures. The porous morphology provides thermal stability and maintains reactivity even after prolonged exposure to high-temperature combustion gases
3Object-generated harmful factors
If conventional sorbents are used, then acid pollutant removal is achieved, but corrosion issues persist due to variability of waste composition
Solution Approach 1:
The composite sorbent formulation with calcium hydroxide, magnesium hydroxide, and magnesium oxide provides balanced neutralization capability against various acid pollutants (SOx, HCl, HF) commonly found in waste incineration. This composite approach ensures reliable performance across varying waste compositions without causing corrosion or operational instability
Solution Approach 2:
The high-temperature operation parameter fundamentally changes the chemical environment, enabling complete neutralization of acid pollutants before they can cause corrosion. The elevated temperature ensures that acid gases are effectively captured regardless of waste composition variations, protecting plant equipment
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 high neutralization efficiencies for SO2, SO3, HCl, and HF, with reduced sorbent dosage and minimized corrosion, optimizing energy recovery and extending plant operational efficiency by pre-neutralizing acid pollutants and modifying ash composition for easier removal.
Implementation Method 1
The neutralization reactions of the acid pollutants take place on the surface of the particles of alkaline sorbent, following adsorption, chemisorption and absorption phenomena of the pollutants
Implementation Method 2
The neutralization reactions of the acid pollutants take place on the surface of the particles of alkaline sorbent, following adsorption, chemisorption and absorption phenomena of the pollutants
Implementation Method 3
The neutralization reactions of the acid pollutants take place on the surface of the particles of alkaline sorbent, following adsorption, chemisorption and absorption phenomena of the pollutants
Implementation Method 4
The efficiency of this latter sorbent is in fact subject to a thermal decomposition step in which the sodium bicarbonate is converted to sodium carbonate
Data Source
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AI summary
It is described a method for controlling the emission of polluting substances in a gaseous effluent produced by a combustion process comprising at least the step of putting said gaseous effluent, at a temperature within the range of 800°C - 1400°C, in contact with a sorbent composition in powder form comprising at least calcium hydroxide (Ca(OH)2), magnesium hydroxide ((MgOH)2) and magnesium oxide (MgO), said sorbent having a specific surface area (BET) greater than 20 m2 /g. A sorbent composition in powder form, said sorbent thermally activated and a process for the preparation of said sorbent composition are also described.