Sludge Pyrolysis Process for Chlorine Compound Decomposition
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Solution Overview
Problem
Current sludge treatment methods, such as incineration and chemical treatments, fail to effectively decompose harmful compounds like chlorine-based pollutants, often re-synthesizing them and requiring complex equipment, which is costly and inefficient.
Innovation Solution
A sludge treatment process involving adjusting the sludge particle diameter to 2 mm to 45 mm, followed by pyrolysis in a low-oxygen atmosphere at 350° C. to 500° C. and subsequent combustion, effectively decomposing harmful chlorine compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If incineration is used to reduce waste volume and recover energy, then volume reduction and energy recovery are improved, but harmful compounds are vaporized and released into the atmosphere
Solution Approach 1:
The patent applies inert atmosphere by conducting pyrolysis in an oxygen-free or low-oxygen environment, preventing harmful compounds from being vaporized and released. The inert atmosphere suppresses combustion reactions that would otherwise generate harmful emissions, while still achieving waste decomposition through thermal breakdown.
Solution Approach 2:
The patent changes the temperature parameter to a specific range (350-500°C) that is sufficient for pyrolysis but below the threshold for significant vaporization of harmful compounds. This parameter optimization allows effective waste decomposition while minimizing harmful emissions.
2Ease of operation
If landfill is used for waste disposal, then ease of operation is improved, but harmful compounds pollute the soil and accumulate in living organisms
Solution Approach 1:
The patent replaces the mechanical landfill system with a thermal-chemical treatment system (pyrolysis). Instead of physically burying waste, the system uses controlled thermal decomposition to break down harmful compounds into less harmful substances, eliminating soil pollution and bioaccumulation risks.
Solution Approach 2:
The patent performs preliminary decomposition of harmful compounds through pyrolysis before final waste disposal. By pre-treating the waste to break down toxic substances, the remaining material can be safely disposed of without causing soil pollution or bioaccumulation.
3Productivity
If plasma treatment or high-temperature base reaction is used, then waste treatment capability is improved, but equipment operation cost increases
Solution Approach 1:
The patent optimizes the temperature parameter to a moderate range (350-500°C) that is effective for pyrolysis but significantly lower than plasma treatment or high-temperature base reaction. This parameter adjustment maintains waste treatment capability while reducing energy consumption and operational costs.
Solution Approach 2:
The patent uses a simpler, more economical pyrolysis system compared to expensive plasma or high-temperature equipment. The approach prioritizes cost-effective operation over advanced technology, using readily available pyrolysis equipment to achieve effective waste treatment at lower operational costs.
4Object-generated harmful factors
If activated carbon adsorption or bag filter is used in terminal process, then harmful compounds are removed, but total amount of harmful compounds is not significantly changed and removal efficiency is low
Solution Approach 1:
The patent replaces physical removal methods (adsorption and filtration) with thermal-chemical decomposition (pyrolysis). Instead of merely separating harmful compounds from waste, the pyrolysis process fundamentally breaks down the molecular structure of harmful substances, achieving actual decomposition and elimination rather than physical transfer.
Solution Approach 2:
The patent utilizes phase transitions during pyrolysis, where harmful compounds transition from solid/liquid waste matrix to gaseous decomposition products that can be more easily managed. The thermal energy induces phase changes that facilitate the breakdown and separation of harmful substances for efficient removal.
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 process efficiently decomposes toxic chlorine compounds, saving time and energy while maximizing removal efficiency and reducing re-synthesis, thus improving environmental safety and economic feasibility.
Implementation Method 1
a pyrolysis step of pyrolyzing the sludge in a low-oxygen or oxygen-free atmosphere and at a temperature of 350° C. to 500° C.
Implementation Method 2
a combustion step of burning a gas generated in the pyrolysis step
Data Source
AI summary
A sludge treatment process including: adjusting sludge to a particle diameter of more than 2 mm to 45 mm or less; a step of pyrolyzing the adjusted sludge in a low-oxygen or oxygen-free atmosphere and at a temperature of 350° C. to 500° C.; and a step of combusting a gas generated in the pyrolysis. Such process may be used to decompose harmful compounds and maximize the efficiency of the process.