Sand-Manure Separation Tank Layout for Fine Sand Settling
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Solution Overview
Problem
Existing sand-manure liquid separation plants face inefficiencies in settling fine sand due to surface tension, leading to delayed settling and reduced efficiency, particularly when processing mixtures with small grain sizes.
Innovation Solution
The plant incorporates fluid outlets above the maximum filling level to disrupt the surface tension, using pneumatic or hydraulic action, optionally with surfactants, and employs a stirrer to separate organic matter, combined with a cyclone for pre-separation and screw conveyors for sand reuse, ensuring minimal organic matter content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fine sand is supplied to the tank, then the grain size requirement for bedding is met, but the settling process is delayed due to surface tension
Solution Approach 1:
The patent applies pneumatic action by introducing air through nozzles positioned above the liquid surface to disrupt surface tension and promote fine sand settling. The air flow breaks the elastic membrane effect at the surface, allowing fine sand particles to penetrate and settle effectively without excessive delay.
2Productivity
If the mixture inlet is positioned above the maximum filling level, then fluid outlets can be arranged above the surface, but the tank structure becomes more complex
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the mixture inlet above the maximum filling level and arranging fluid outlets above the liquid surface. This spatial arrangement in the vertical dimension allows pneumatic or hydraulic action to effectively disrupt surface tension without requiring complex horizontal modifications to the tank structure.
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 enhances the settling efficiency of fine sand, allowing for high sand reuse quality, with minimal organic matter, thus optimizing the separation process and reducing bacterial growth risks.
Implementation Method 1
a ready settling of the fine sand has been found to be restricted by the surface tension at the surface of the mixture already contained in the tank
Implementation Method 2
by a pneumatic or hydraulic action, optionally supplemented by the addition of a surfactant
Implementation Method 3
driven by an upward flow of water supplied at the bottom of the tank
Implementation Method 4
sand of the mixture contained in the tank normally will gradually settle under the action of gravity at the bottom of the tank
Data Source
AI summary
A sand-manure liquid separation plant including a tank for the processing of a mixture of sand and manure liquid. The tank including a top portion having a mixture inlet for filling the mixture to be processed into the tank and a bottom portion having a sand discharge for discharging sand settled in the tank. A maximum level (ML) of filling of the mixture is defined within the tank, wherein the mixture inlet is arranged at a position at a level above the maximum level (ML) of filling. The plant further includes a number of fluid outlet(s) connectable to a source of a fluid and arranged above the maximum level (ML) of filling. The fluid outlets being configured to provide a flow of the fluid directed towards the maximum level (ML), below the position of the mixture inlet.