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Visualization method and application of anaerobic digestion flow field under multi-scale conditions based on CFD simulation and PIV measurement

An anaerobic digestion, multi-scale technology, applied in the field of environmental engineering, can solve problems such as inability to apply detection, limited detection of high-solid anaerobic digestion flow field, etc., to achieve the effect of improving operating performance, reducing dead zone, and concise operation steps

Active Publication Date: 2022-05-24
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PIV is mostly used for anaerobic digestion of wastewater, but the detection of high-solid anaerobic digestion flow field is extremely limited. The main reason is that PIV requires the detection object to be transparent fluid, while high-solid anaerobic digestion biogas slurry is gray-black opaque fluid
In addition, due to its technical characteristics, the PIV system is currently limited to the laboratory scale and cannot be applied to the detection of actual engineering flow fields.

Method used

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  • Visualization method and application of anaerobic digestion flow field under multi-scale conditions based on CFD simulation and PIV measurement
  • Visualization method and application of anaerobic digestion flow field under multi-scale conditions based on CFD simulation and PIV measurement
  • Visualization method and application of anaerobic digestion flow field under multi-scale conditions based on CFD simulation and PIV measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A multi-scale method for visualizing the flow field of anaerobic digestion based on CFD simulation and PIV measurement, including the following steps:

[0040] Step 1: Take the sludge anaerobic digestion system with a solid content of 0.5% as the object, and use deionized water as its simulated working fluid;

[0041] Step 2: Establish an anaerobic digestion cold mold model according to geometric similarity, without biochemical reactions, such as Figure 2 The cold mold reactor is a transparent cylinder with a diameter of 100mm and a height of 200mm, and the filling height of the test liquid is 120mm, in order to reduce the influence of the refractive index of light, the cold mold reactor is placed in a transparent square container filled with water;

[0042] Deionized water is loaded into a cold mold reactor and an axisymmetric center plane is selected to observe the distribution of velocity, shear force, vortex and dead zone in the anaerobic digestion reactor;

[0043] Step ...

Embodiment 2

[0048] A multi-scale method for visualizing the flow field of anaerobic digestion based on CFD simulation and PIV measurement, including the following steps:

[0049] Step 1: Take the high-solidity anaerobic digestion system of pig manure with a solidity rate of 14.3% as the object, measure the rheological characteristics of the biogas slurry, and use the power rate model to simulate the corresponding rheological characteristics; the scanning electron microscope and laser particle sizer are used to measure the material structure characteristics of high-solid anaerobic digestion of pig manure, and the material structure characteristics of the high-solid anaerobic digestion biogas digestion biogas slurry are obtained, according to which 3.00 wt% of the transparent lithium algae soil suspension is selected as the simulated working fluid;

[0050] Step 2: Establish a cold mold model of high-solid anaerobic digestion according to geometric similarity, without biochemical reactions, suc...

Embodiment 3

[0069] A multi-scale method for visualizing the flow field of anaerobic digestion based on CFD simulation and PIV measurement, including the following steps:

[0070]Step 1: Take the high-solidity anaerobic digestion system of pig manure with a solidity rate of 14.3% as the object, measure the rheological characteristics of the biogas slurry, and use the power rate model to simulate the corresponding rheological characteristics; the scanning electron microscope and laser particle sizer are used to measure the material structure characteristics of high-solid anaerobic digestion of pig manure, and the material structure characteristics of the high-solid anaerobic digestion biogas digestion biogas slurry are obtained, according to which 3.00 wt% of the transparent lithium algae soil suspension is selected as the simulated working fluid;

[0071] Step 2: Establish a cold mold model of high-solid anaerobic digestion according to geometric similarity, without biochemical reactions, such...

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Abstract

The invention belongs to the technical field of environmental engineering, and relates to the visualization of anaerobic digestion systems with different solid content rates, in particular to a visualization method and application of anaerobic digestion flow field under multi-scale conditions based on CFD simulation and PIV measurement. The digested flow field is simulated, and then a transparent fluid with similar rheological properties to the anaerobic digested biogas slurry is selected to simulate the working fluid and measured by PIV. The measured results are verified with the CFD simulation results; The corresponding grid size, turbulence model, and numerical algorithm are adjusted until the two are consistent. The invention has simple operation steps, helps to guide the design and operation of the reactor, reduces the dead zone in the anaerobic digestion reaction system under multi-scale conditions, improves the stirring efficiency and further increases the processing capacity of the reactor. The application of the invention can improve the operation performance, operation stability and economy of the anaerobic digestion flow field, and play a guiding role in practical engineering.

Description

Technical field [0001] The present invention belongs to the field of environmental engineering technology, involving the visualization of anaerobic digestion systems with different solids content, in particular to a multi-scale anaerobic digestion flow field visualization method and application based on CFD simulation and PIV measurement. Background [0002] Anaerobic digestion can not only effectively treat organic waste, but also recycle green and clean energy. However, the biogas liquid digested by high-solid anaerobic (10% to 20%) is a viscous non-Newtonian fluid with complex rheological characteristics such as shear thinning, thixotropy, viscoelasticity, etc.; it is difficult for the high-solid anaerobic digestion system to be fully stirred, and there is a large range of short currents, dead zones, and stagnation areas in the flow field, which causes the accumulation of inhibitory intermediate products (such as volatile organic acids and ammonia nitrogen), which greatly redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F30/25G06F111/04G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F30/25G06F2111/04G06F2111/10G06F2113/08G06F2119/14
Inventor 胡玉瑛叶文杰张世豪胡锋平彭小明戴红玲王鑫
Owner EAST CHINA JIAOTONG UNIVERSITY