Thermal and flow characteristics of a cylindrical superheated steam generator with helical fins

Bang, You-Ma; Cho, Chong Pyo; Jung, Young-Dae; Park, Seong‐Ryong; Kim, Joeng-Geun; Park, Sungwook

doi:10.1016/j.energy.2022.126599

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…The spiral width was kept fixed to prevent carbon accumulation near the inner tube during thermal decomposition. A larger space height could result in lower velocity and reduced heat transfer efficiency, as the energy transferred from the outer barrel wall may be compromised [28]. The pitch of the spiral remained fixed to meet the heat transfer requirements, with a furnace heat capacity of 66 kW and the reactor constructed using SUS 310 material.…”

Section: Field Systemmentioning

confidence: 99%

Design of Pyrolysis Plant for Waste Methyl Ethyl Ketone from the Polarizer Manufacturing Process

Zhang

Huang

et al. 2023

Applied Sciences

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The rapid growth of the semiconductor industry has made significant strides in addressing clean energy concerns. However, there are still unresolved issues related to waste solvents. One promising approach to tackle these challenges is through pyrolysis. This study selected waste methyl ethyl ketone (MEK) from the industrial sector as the feedstock for pyrolysis, resulting in various residual products such as fixed carbon (char), carbon soot, and fuel gases. Experimental results demonstrated that operating temperatures between 750 and 900 °C under anaerobic conditions yielded 5% to 10 wt% of fixed carbon, along with a small amount of tar and 80% to 90% of fuel gases. The research included lab-scale pilot experiments and field-scale system studies to develop a comprehensive concept for a thermal cracking plant. SolidWorks and Aspen Plus software were applied for calculations involving heat-transfer coefficients, residence time, and the utilization of fuel gases with a boiler or burner. A field system was constructed to scale up the pyrolysis process and effectively eliminate waste solvents, incorporating an automated procedural process.

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Section: Field Systemmentioning

confidence: 99%

Design of Pyrolysis Plant for Waste Methyl Ethyl Ketone from the Polarizer Manufacturing Process

Zhang

Huang

et al. 2023

Applied Sciences

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“…At present, the research on duplex stainless steel weld joints is mainly focused on thick-walled plate butt joints. However, in the practical applications of chemical and marine engineering, there are often a large number of thin-walled pipelines, such as superheated pipelines in steam generators [ 33 , 34 ]. Within this context, this study makes a further contribution to the understanding of the fatigue performance of the joint of UNS S32205 duplex stainless steel thin tube.…”

Section: Introductionmentioning

confidence: 99%

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Yang,

Zheng,

Wang

et al. 2023

Materials

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To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A good thin-walled pipe butt joint was formed using the pulsed tungsten inert gas (P-TIG) welding method with Ar-N2 shielding gas. High cycle fatigue tests of the weld joints were conducted to study the effect of shielding gas nitriding on the fatigue properties. Fatigue tests at three stress levels of 225 MPa, 270 MPa, and 360 MPa were carried out on the weld joints with different N2 contents, and the fatigue samples were all fractured in the high temperature heat-affected zone (H-HAZ). Within the current process parameters, the fatigue life of the 4 vol.% N2 welded joints was optimal. Fatigue striations appeared in the fatigue crack propagation zone, and the transient fracture zone was similar to the tensile fracture. Under the low-stress level, the area of the crack propagation zone under 4 vol.% N2 was the highest, the tear ridges all expanded around the crack source area, and the fatigue crack propagation zone presented a radial distribution. The proliferation and expansion of dislocations were mainly carried out in the austenite grains, and the dislocation density of the fatigue specimens under 4 vol.% N2 was smaller than that of the Ar specimens. Shielding gas nitriding effectively improved the balance of the two-phase ratio and the hardness of austenite phase, optimized the internal slip system, inhibited the proliferation of dislocations in the austenite phase, and improved the fatigue life of weld joints.

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Thermal and flow characteristics of a cylindrical superheated steam generator with helical fins

Cited by 2 publications

References 30 publications

Design of Pyrolysis Plant for Waste Methyl Ethyl Ketone from the Polarizer Manufacturing Process

Design of Pyrolysis Plant for Waste Methyl Ethyl Ketone from the Polarizer Manufacturing Process

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

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