Slag Processing Grate for Waste Incineration
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Solution Overview
Problem
Current methods for processing slag from waste incineration plants face challenges in efficiently drying and separating dry slag to recover valuable materials, as wet slag requires lengthy drying processes, leading to material loss and potential setting reactions, while existing dry slag separation methods disrupt the energy balance and require complex equipment.
Innovation Solution
A slag processing device with a separate slag processing chamber and water-cooled grate that separates slag into fine and coarse fractions through controlled air supply and openings, ensuring optimal burnout and cooling without affecting the combustion chamber's energy balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wet slag is discharged using conventional deslagging devices, then slag removal is achieved, but lengthy drying processes are required leading to material loss and setting reactions
Solution Approach 1:
The combustion chamber is divided into a main combustion chamber and a separate slag processing chamber. The slag processing chamber receives slag from the main combustion chamber and provides a dedicated space for cooling and drying slag before removal, eliminating the need for lengthy external drying processes
Solution Approach 2:
The slag processing chamber performs preliminary cooling and drying of slag immediately after it leaves the main combustion chamber. This preliminary action prevents setting reactions and reduces drying time by addressing moisture removal before slag is discharged for landfill or further processing
2Productivity
If air is introduced for dry slag separation, then slag can be separated into fine and coarse fractions, but the energy balance of the combustion chamber is disrupted
Solution Approach 1:
The system separates the cooling and separation functions into a distinct slag processing chamber, allowing air to be introduced there without affecting the main combustion chamber's energy balance. The grate structure enables controlled air distribution for efficient slag cooling and separation
Solution Approach 2:
The slag processing chamber acts as an intermediary between the main combustion chamber and the final slag discharge. It provides a transition zone where air can be introduced for cooling and separation without directly impacting the combustion process, thus protecting the energy balance while enabling efficient slag treatment
3Temperature
If water cooling is used for slag, then cooling efficiency is improved, but the slag becomes wet requiring extensive drying
Solution Approach 1:
The water-cooled grate performs preliminary cooling of slag immediately upon entry into the slag processing chamber. This controlled preliminary cooling reduces slag temperature efficiently while the subsequent drying phase in the same chamber removes moisture before discharge, eliminating the need for extended external drying periods
Solution Approach 2:
The slag processing chamber provides continuous cooling and drying action throughout the slag residence time. The water-cooled grate continuously removes heat while the chamber environment simultaneously performs drying, creating a continuous useful action that eliminates idle drying time and accelerates the overall process
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 solution enables efficient separation and cooling of slag, minimizing material loss and maintaining the energy balance, allowing for effective recovery of recyclable materials without the need for extensive drying or complex equipment.
Implementation Method 1
a water-cooled grate for cooling slag
Implementation Method 2
Air supply lines for the controlled supply of air to the slag, in order to fan still combustible material in the slag for improved burnout
Data Source
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AI summary
The device (26) comprises a slag inlet (22) for introducing the slag into a slag processing chamber (24), is arranged facing a slag outlet (62). A slag processing rust (30) is provided for cooling and promoting the slag towards the slag outlet. A fine slag discharge space (34) is connected to the chamber for discharging a fine fraction of the slag through an opening of the outlet. A coarse slag discharge space (64) is opened for receiving a coarse fraction of the slag. An air supply unit is provided in the rust for controllable supply of the air to the slag outlet. An independent claim is included for a method for processing a slag through a slag processing device.