High efficiency solar steam generator comprising sodium alginate-polydopamine hydrogel for photothermal water sanitation

2022 ◽  
Vol 51 ◽  
pp. 101998
Author(s):  
Shuni Chen ◽  
Danni Ma ◽  
Wenxiu Gao ◽  
Sihong Zhou ◽  
Yanming Guo ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Steam Generator ◽  
High Efficiency

scholarly journals The Drop-in-Drop Encapsulation in Chitosan and Sodium Alginate as a Method of Prolonging the Quality of Linseed Oil

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1355 ◽  
Author(s):  
Szymon Mania ◽  
Robert Tylingo ◽  
Anna Michałowska
Keyword(s):  
Sodium Alginate ◽  
High Efficiency ◽  
Unsaturated Fatty Acids ◽  
Linseed Oil ◽  
Control Sample ◽  
Membrane System ◽  
Oxidation Products ◽  
Food Ingredients ◽  
Preservation Method

Nowadays, the encapsulation of sensitive products by various techniques has become popular as a promising preservation method. In particular, this applies to oils with a high content of unsaturated fatty acids and a high susceptibility to deterioration. This work presents the possibility of using a chitosan and sodium alginate in the form of a hydrogel membrane to protect food ingredients such as linseed oil, which is stored in an aquatic environment. The obtained results showed the high efficiency of the coaxial method encapsulation, which did not affect the quality of the oil measured after encapsulation. The greatest protective effect was observed in the linseed oil–chitosan membrane system, in which the primary and secondary oxidation products content were 88% and 32% lower than in the control sample, respectively. The smallest changes of the fatty acid profile, conjugated dienes, and trienes were observed in the chitosan capsules with linseed oil compared to the control sample.

scholarly journals Development and Experimental Validation for Quantifying the Moisture Carryover in a Moisture Separator Using an Air/Water Test Facility

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Kihwan Kim ◽  
Wooshik Kim ◽  
Jaebong Lee ◽  
Woo-Jin Jeon
Keyword(s):  
Experimental Method ◽  
Steam Generator ◽  
High Efficiency ◽  
Test Facility ◽  
Test Results ◽  
Inherent Limitation ◽  
Water Test ◽  
Moisture Separator ◽  
Important Design ◽  
Similarity Law

The moisture carryover (MCO) of the primary separator in a steam generator is the most important design parameter to ensure high efficiency in a steam generator. There is an inherent limitation to experimentally evaluate the MCO under the prototype conditions. In this study, the air/water test facility was constructed based on the similarity law, and a new isokinetic system was developed to quantify the MCO. Several experiments were performed for the mass quality ranging from 0.315 to 0.382. The accuracy and versatility of the experimental method was verified experimentally using a full and half scale of separators. The test results were compared with the prototype results. It was proved to be a reliable experimental method for evaluating the MCO of the moisture separator.

Selective Catalytic Reduction Impact on Heat Recovery Steam Generator Design and Operation

1986 ◽  
Author(s):  
James S. Davis ◽  
G. C. Duponteil
Keyword(s):  
Selective Catalytic Reduction ◽  
Gas Turbine ◽  
Steam Generator ◽  
Heat Recovery ◽  
Gas Flow ◽  
High Efficiency ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Heat Recovery Steam Generator ◽  
The Impact

Selective Catalytic Reduction (SCR) is a post-combustion method to reduce the oxides of nitrogen (NOx), present in flue gases such as gas turbine exhaust streams, to N2 and water. It involves the injection of ammonia and the use of a catalyst module to promote the reaction to obtain high efficiency (60–86+%) NOx reduction. Several operating parameters can influence catalyst performance to include temperature, gas flow distribution, presence of sulfur compounds and catalyst age. This paper examines the impact of a SCR integration in a gas turbine heat recovery steam generator (HRSG) design/operation. Limitations on HRSG load and following capabilities, effect on capital cost and overall performance and current SCR system experience represent a number of areas that are examined.

Development of a Thermal-Hydraulic Analysis Code for Helical Coiled Once Through Steam Generator

2018 ◽  
Author(s):  
Jun Huang ◽  
Junli Gou ◽  
Haifu Ma ◽  
Jie Fan ◽  
Jianqiang Shan
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Nuclear Power ◽  
Power Plants ◽  
High Efficiency ◽  
Fluid Model ◽  
Computer Code ◽  
Medium Size ◽  
Hydraulic Characteristics ◽  
Pressurized Water

Due to their advantages, such as compactness and high efficiency in heat transfer, helically coiled heat exchangers have been widely used by different type of nuclear power plants, especially by small and medium size reactors (SMRs). In order to analyze the thermal-hydraulic characteristics of a helical coiled once through steam generator (OTSG) for a small integral pressurized water reactor, a computer code is developed in this paper. The code is based on two-fluid model. The constitutive correlations are recommended based on the assessments with the compiled databases from the reviewed literatures. NUSOL SG is validated and verified against heat transfer in helical coiled tubes, and the calculation results agree well with the experiment data. The present study could provide references for the investigators to perform further investigations on the thermal hydraulic characteristics of helical coiled OTSGs.

Loofah Activated Carbon Sodium Alginate Hydrogel Microspheres with High Efficiency Cyclic Adsorption for Antibiotic Contaminants

2020 ◽  
Vol 15 (2) ◽  
pp. 219-225
Author(s):  
Zhe Wang ◽  
Wenyao Li ◽  
Kenan Zhang ◽  
Haishun Jiang ◽  
Tao Ji ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Sodium Alginate ◽  
High Efficiency ◽  
Raw Material ◽  
Resistant Bacteria ◽  
Alginate Hydrogel ◽  
Adsorption Mechanisms ◽  
Drug Resistant Bacteria ◽  
Antibiotic Solution ◽  
Cyclic Adsorption

The global abuse of antibiotics has led to many environment problems such as water pollution and drug-resistant bacteria. In this study, pure natural loofah was used as raw material to form powdered loofah activated carbon (LAC) after high temperature carbonization annealing, and sodium alginate (SA) with gel ability was combined to prepare loofah activated carbon sodium alginate (LAC-SA) hydrogel sphere by external emulsification method. This work showed that the adsorption mechanisms of LAC-SA microspheres for the three antibiotics of ofloxacin (OFO), tetracycline (TC) and norfloxacin (NFO) were in line by the psedosecond-order and the formula of Langmuir. The ofloxacin (OFO) antibiotic solution was used as a sample for cyclic adsorption experiment for 10 times and the cumulative adsorption amount exceeded 700 mg g–1.

Numerical Simulation Analysis of Corrugated Plate With Hook

2017 ◽  
Author(s):  
Bowen Chen ◽  
Ruifeng Tian ◽  
Feng Mao ◽  
Wei He
Keyword(s):  
Pressure Drop ◽  
Steam Turbine ◽  
Steam Generator ◽  
Nuclear Power ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Saturated Steam ◽  
System Pressure ◽  
Water Separator

Separation device is one of the important equipment in the steam generator, which reduce the humidity, and it is a key device of nuclear plant which can guarantee the saturated steam to the steam turbine to provide clean. In nuclear power plant, the nuclear steam turbine uses saturated steam directly, so the separation system in steam generator requires a high efficiency of separation. Because of its simple process, high separation efficiency, low system pressure drop and large capacity, small volume, long life and other advantages, corrugated plate in water separator technology is more and more extensive application in the production process. In this paper, the corrugated plate water separator is simulated research, through the establishment of a two-dimensional model of corrugated plate, separation efficiency and pressure drop of corrugated plate is simulated. By setting the different air speed, different gap of hook-plate, observe the change of the pressure drop and separation efficiency, and analyzes the internal mechanism of the foundation for the optimization of corrugated plate dryer.

scholarly journals Removal of Ciprofloxacin with Aluminum-Pillared Kaolin Sodium Alginate Beads (CA-Al-KABs): Kinetics, Isotherms, and BBD Model

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 905 ◽  
Author(s):  
Yuying Hu ◽  
Cheng Pan ◽  
Xiaohuan Zheng ◽  
Susu Liu ◽  
Fengping Hu ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Adsorption Kinetics ◽  
High Efficiency ◽  
Low Cost ◽  
Chemical Properties ◽  
Environmental Safety ◽  
Alginate Beads ◽  
Maximum Adsorption Capacity ◽  
Solidification Processes ◽  
Novel Material

In recent years, the problem of water pollution caused by antibiotics has attracted wide attention. The common use of antibiotics represents a threat to both human health and environmental safety. The modification of kaolin clay is promising due to its high efficiency, easy operation, and low cost. In this study, a novel material, aluminum-pillared kaolin sodium alginate beads (CA-Al-KABs), was synthesized by gelling and solidification processes. The structure and chemical properties were characterized by various analytical methods. The influencing factors (such as adsorbent dosage, contacting time, pH, ion strength, temperature, and initial concentration) and adsorption mechanism of ciprofloxacin (CIP) were studied. Furthermore, adsorption kinetics, adsorption isotherms, and a Box–Behnken design (BBD) model were conducted. Moreover, CA-Al-KABs’ adsorption efficiency towards other antibiotics were also evaluated. The adsorption experiments showed that the acidic environment (pH = 4) was more favorable for the adsorption of ciprofloxacin. The adsorption kinetics of ciprofloxacin by CA-Al-KABs microspheres were confirmed to be more suitable with the pseudo-first-order kinetics model. The Langmuir isotherm model showed that the maximum adsorption capacity of CA-Al-KABs microspheres to ciprofloxacin was 68.36 mg/g at 308.15 K. The adsorption driving force of CIP near CA-Al-KABs may be the electrostatic attraction. Further, CIP could also form complexes with Ca2+ and Al—Al—OH on CA-Al-KABs, and thus CIP was attracted to the adsorbent. Adsorption thermodynamics showed that the adsorption process was exothermic, feasible, and spontaneous. In addition, the adsorption performance on other antibiotics indicated CA-Al-KABs’ broad application in the treatment of antibiotic wastewater.

scholarly journals Adsorption of As(III), Pb(II), and Zn(II) from Wastewater by Sodium Alginate Modified Materials

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Hongchuan Li ◽  
Rui Jin ◽  
Hongxiang Hu ◽  
Yusef Kianpoor Kalkhajeh ◽  
Yingying Zhao ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
High Efficiency ◽  
Removal Rate ◽  
Order Kinetic ◽  
Isothermal Adsorption ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Solid Ratio ◽  
Composite Gel ◽  
Pseudo Second Order

Sodium alginate (SA), polyvinyl oxide (PEO), and ceramic nanomaterials were used to prepare alginate composite gel. The present study examined the removal rate and adsorption capacity of alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Batch experiments were conducted to study the influence of experimental parameters such as pH and temperature, as well as the mechanism of As(III), Pb(II), and Zn(II) adsorption with the new adsorbent. The results showed the high efficiency of sodium alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Under the condition of the best liquid-solid ratio and the contact time, the removal rates of As(III), Pb(II), and Zn(II) were 67.42%, 95.31%, and 93.96%, respectively. The pseudo-second-order kinetic equation was superior to fit the adsorption kinetics process. The isothermal adsorption models of As(III) and Pb(II) fitted well with the Freundlich model, and Zn(II) fitted well with the Langmuir model. The results of SEM, EDS, XPS, and FTIR analyses revealed that the adsorption process occurred mainly via chemisorption. The results of the present study suggest that new adsorbents can be effectively utilized for As(III), Pb(II), and Zn(II) removal from water.

scholarly journals Treatment of succinonitrile wastewater by immobilized high efficiency microorganism strains

2008 ◽  
Vol 58 (4) ◽  
pp. 911-918 ◽  
Author(s):  
X. F. Zhou ◽  
Y. L. Zhang ◽  
D. Q. Xu ◽  
W. H. Cao ◽  
C. M. Dai ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
High Efficiency ◽  
Treatment Plant ◽  
Optimal Growth ◽  
Sole Source ◽  
Growth Conditions ◽  
Experimental Conditions ◽  
J 13 ◽  
Rotary Speed

Using succinonitrile as a sole source of carbon and nitrogen, two bacterium strains named as J-1-3 and J-13-1 were isolated and screened out from the treatment facilities of Shanghai petrochemical wastewater treatment plant treating acrylic fiber production wastewater. The optimal growth conditions of the two strains in the degradation of succinonitrile with varied initial concentrations were determined through flask tests as follows: temperature 30°C, shaker rotary speed of 250 r/min, inoculum percentage 0.1%, and initial pH 6. Results indicate that the two strains, especially J-13-1, exhibited a high efficiency for succinonitrile degradation. Thereafter, the bacterium strains were immobilized separately by sodium alginate and polyvinyl alcohol 1750±50, and applied to succinonitrile degradation again. Results show that in a very broad range of the initial succinonitrile concentration, i.e., 30–5,000 mg/L, the sodium alginate immobilized grains could degrade more than 80% of succinonitrile after 24 h under the experimental conditions of 30°C, pH 6.5, and shaker rotary speed of 250 r/min. However, the polyvinyl alcohol immobilized grains tended to inflate and break down due to a weak mechanical strength.

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