scholarly journals Calculation Model of Photochemical Reactor with a Pulse Xenon Lamp for Water Treatment

2016 ◽  
Vol 5 (4) ◽  
pp. 51-57
Author(s):  
Ивашкин ◽  
A. Ivashkin ◽  
Новиков ◽  
D. Novikov ◽  
Камруков ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Efficiency ◽  
Water Treatment ◽  
Calculation Model ◽  
Model Verification ◽  
Xenon Lamp ◽  
Physical Processes ◽  
Chemical Pollutants ◽  
Calculation Module ◽  
Particles Trajectories

A calculation model of the photochemical reactor based on a pulse xenon lamp and intended for water treatment from microbiological or chemical pollutants has been developed and realized. The model includes several calculation modules, each one describes the basic physical processes ongoing in the photochemical reactor: current’s form calculation module, pollutant’s particles trajectories calculation module, pulse lamp’s radiating characteristics calculation module, module for photometric calculation, determining an energy radiation dose of pollutant particles. Calculation of lamp’s radiating characteristics is based on ideas of gas discharge physics and on a number of empirical dependences, for calculation of other parameters has been used the numerical simulation. Model verification has been carried out by comparison of calculated and experimental efficiencies for two types of photochemical reactors’ designs with use of the known pollutant. The developed calculation model allows perform multi-parameter optimization for designs and regime parameters of pulse photochemical reactors for the purpose of increase their energy efficiency, and level of water treatment from various chemical and biological pollutants.

scholarly journals Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 150
Author(s):  
Kyösti Rajaniemi ◽  
Tao Hu ◽  
Emma-Tuulia Nurmesniemi ◽  
Sari Tuomikoski ◽  
Ulla Lassi
Keyword(s):  
Energy Efficiency ◽  
Water Treatment ◽  
Chemical Precipitation ◽  
Phosphate Removal ◽  
Nutrient Recovery ◽  
Ammonium Removal ◽  
Synthetic Water

Batch electrocoagulation (BEC), continuous electrocoagulation (CEC), and chemical precipitation (CP) were compared in struvite (MgNH4PO4·6H2O) precipitation from synthetic and authentic water. In synthetic water treatment (SWT), struvite yield was in BEC 1.72, CEC 0.61, and CP 1.54 kg/m3. Corresponding values in authentic water treatment (AWT) were 2.55, 3.04, and 2.47 kg/m3. In SWT, 1 kg struvite costs in BEC, CEC, and CP were 0.55, 0.55, and 0.11 €, respectively, for AWT 0.35, 0.22 and 0.07 €. Phosphate removal in SWT was 93.6, 74.5, and 71.6% in BEC, CEC, and CP, respectively, the corresponding rates in AWT were 89.7, 77.8, and 74.4%. Ammonium removal for SWT in BEC, CEC, and CP were 79.4, 51.5, and 62.5%, respectively, rates in AWT 56.1, 64.1, and 60.9%. Efficiency in CEC and BEC are equal in nutrient recovery in SWT, although energy efficiency was better in CEC. CP is cheaper than BEC and CEC.

Heat Exchange Calculation of a Regenerative Air Heater with Numerical Simulation Method

2013 ◽  
Vol 860-863 ◽  
pp. 1416-1419
Author(s):  
Ri Guang Wei ◽  
Zhen Xiao Qu ◽  
Jian Qiang Gao
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Calculation Model ◽  
Design Parameters ◽  
Practical Calculation ◽  
Air Preheater ◽  
Air Heater ◽  
Pulverized Coal Boiler ◽  
Set Up ◽  
Coal Boiler

According to the structure and working principle of rotary air preheater,the heat transfer calculation model is set up with reasonable simplification. Combining with the design parameters of the rotary air preheater of a 400 t/h pulverized coal boiler unit ,the results of practical calculation show that the said thermodynamic calculation method not only has higher precision of calculation,but also can get the temperature distributions of the gas, air and heat surface in each cross-section of the rotary air preheater. The result of numerical simulation calculation tallies well with the original designed data. It can be used for the heat calculation both two-sectorial and three-sectorial air heater; it can be used for performance analysis of the regenerative air heater.

scholarly journals Coupling numerical model of hydraulic fracturing seepage in soft coal based on elastoplastic damage

2020 ◽  
Vol 198 ◽  
pp. 01038
Author(s):  
LI Liangwei
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Hydraulic Fracturing ◽  
Yield Criterion ◽  
Calculation Model ◽  
Field Application ◽  
Soft Coal ◽  
Plastic Shear Strain ◽  
Strain Relationship ◽  
Relationship Equation

In order to guide the field application of hydraulic fracturing of soft coal in coal mine, based on the elastic-plastic damage theory, the coupling numerical model of soft coal hydraulic fracturing seepage was studied. The porosity strain relationship equation, permeability strain relationship equation, the relationship between permeability and volume plastic tensile strain and volume plastic shear strain of coal and rock mass are derived, and the plastic correction equation and softening parameters are defined. The stress coupling equation and yield criterion are programmed and embedded into the finite difference software FLAC3D for numerical solution. The numerical simulation shows that the numerical calculation model of soft coal hydraulic fracturing conforms to the actual law, and the field fracturing radius investigation experiment is consistent with the numerical simulation results.

Optimization Design of Agricultural Fans Based on Skewed-Swept Blade Technology

2019 ◽  
Vol 35 (2) ◽  
pp. 249-258
Author(s):  
Tao Ding ◽  
Lumeng Fang ◽  
Ji-Qin Ni ◽  
Zhengxiang Shi ◽  
Baoming Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Efficiency ◽  
Optimization Design ◽  
Control Parameter ◽  
Rapid Development ◽  
Performance Testing ◽  
Design Parameters ◽  
Leakage Flow ◽  
Blade Design ◽  
Direction Control

Abstract.With the rapid development of modern agriculture facilities, agricultural fans have been widely used due to their low pressure and large airflow characteristics. However, existing agricultural fans have large flow losses and low energy efficiencies. To increase the airflow and energy efficiency of these fans, optimization designs based on skewed and swept blades were carried out. First, a “DDZ” agricultural fan (a leaf model agricultural fan commonly used in China) was chosen as the archetype fan. Its performance curves and flow field distribution were obtained by performance testing and numerical simulation. Second, the stack lines of the skewed blade and swept blade were designed based on the original blade, 3 skewed blade parameters (skewed angle a, x direction control parameter kx, and y direction control parameter ky), and 3 swept blade design parameters (swept angle ß, z direction control parameter kz, and r direction control parameter kr). Finally, the optimal skewed blade design parameters (a = 16.8°, kx = 1.65, and ky = 0.5) and optimal swept blade design parameters (ß = 10.6°, kz = -0.33, and kr =0.6) were obtained using numerical simulations and orthogonal testing, which is a response surface method. The numerical simulation results showed that the airflow and energy efficiency ratios of the optimal skewed blade fan were increased by 4.3% and 20.5%, and those of the optimal swept blade fan were increased by 4.5% and 15.4%, respectively, in comparison with those of the original fan. The flow fields showed that the optimal skewed blade mainly reduced the radial flow at the blade root and the leakage flow. The optimal swept blade mainly reduced the leakage flow by changing the distribution of the static pressure on the blade surfaces. Keywords: Agricultural fan, Skewed-Swept blade, Numerical simulation, Optimization.

scholarly journals Designing a robust index for WWTP energy efficiency: The ENERWATER water treatment energy index

2020 ◽  
Vol 713 ◽  
pp. 136642 ◽  
Author(s):  
Miguel Mauricio-Iglesias ◽  
Stefano Longo ◽  
Almudena Hospido
Keyword(s):  
Energy Efficiency ◽  
Water Treatment ◽  
Energy Index
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