High-Moisture Waste Disposal via Recycled Combustion Gas Drying
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Solution Overview
Problem
Current methods for disposing high-moisture mixed waste, such as kitchen garbage and water-containing sludge, are energy-intensive and generate pollutants due to the need for extensive heat for drying and the resulting ash and waste gases, which can lead to coking in incinerators and environmental pollution.
Innovation Solution
A system comprising a mixed waste storage device, primary-drying device, secondary-drying device, and incinerating device, where waste gases are recirculated for drying and incineration, utilizing heat exchangers to optimize energy use and reduce moisture content, and incorporating supplementary combustion to enhance drying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-moisture mixed waste is incinerated directly, then waste disposal is achieved, but large amounts of heat are consumed for drying and energy cost increases
Solution Approach 1:
The patent converts the harmful waste gas containing combustible components into a beneficial drying medium by burning it in the combustion chamber to produce hot flue gas, which is then used for drying waste in the drying chamber. This transforms an energy waste problem into an energy source, reducing overall energy consumption.
Solution Approach 2:
The patent combines the waste gas treatment process with the waste drying process by integrating the combustion chamber and drying chamber into a single system. The waste gas combustion and waste drying functions are merged, allowing simultaneous energy recovery and moisture removal.
2Ease of manufacture
If waste gas from drying is discharged directly, then drying process is completed, but environmental pollution occurs
Solution Approach 1:
The patent converts the harmful waste gas into a useful combustible resource by directing it to the combustion chamber where it is burned to generate heat for the drying process, eliminating pollution while recovering energy.
Solution Approach 2:
The system uses its own waste gas output as the fuel source for the combustion chamber, creating a self-sustaining process where the drying process generates its own heating requirement through waste gas combustion.
3Use of energy by moving object
If low temperature incineration is used, then energy consumption is reduced, but ash generation increases and coking occurs on incinerator walls
Solution Approach 1:
The patent extracts the moisture removal function from the incineration process by adding a separate drying chamber before the combustion chamber. This separation allows the incineration to occur at optimal temperatures without the complications of high-moisture waste, preventing coking and improving reliability.
4Productivity
If drying is performed before incineration, then incineration efficiency is improved, but heat consumption increases
Solution Approach 1:
The patent converts the waste gas that would normally be discarded into a fuel source for the combustion chamber. By burning waste gas containing combustible components, the system generates heat to drive the drying process, converting an energy loss into an energy gain.
Solution Approach 2:
The patent recovers energy from waste gas that would otherwise be discarded during the drying process. The combustible components in the waste gas are captured and burned to generate the heat required for drying, transforming waste into a useful resource.
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 system effectively reduces energy consumption, prevents pollution, extends incinerator lifespan, and improves incineration efficiency by recycling waste heat and minimizing ash-related issues, while ensuring thorough waste disposal and odor control.
Implementation Method 1
a mixed waste incinerating device comprises an incinerator
Implementation Method 2
utilizing heat exchangers to optimize energy use
Implementation Method 3
utilizing heat exchangers to optimize energy use and reduce moisture content
Data Source
AI summary
A system for disposing a high-moisture mixed waste composed of kitchen garbage and water-containing sludge is provided, including a mixed waste storage device, a mixed waste primary-drying device and a mixed waste incinerating device. The mixed waste primary-drying device includes a mixed waste primary-drying body, a primary-drying material inlet, a primary-dried material outlet, a drying gas inlet and a primary waste gas outlet. A discharging outlet of the mixed waste storage device is connected with the primary-drying material inlet through the first conveying belt. The mixed waste incinerating device includes an incinerator, an incineration material inlet, an incineration material outlet, a combustion-supporting gas inlet and a flue gas outlet. The incineration material inlet is connected with the primary-dried material outlet through the second conveying belt and the combustion-supporting gas inlet is connected with the primary waste gas outlet. The flue gas outlet is connected with the drying gas inlet.