Abstract The optimal design of groundwater circulation wells (GCWs) is challenging. key to purifying using this technique its proficiency and productivity. However, traditional numerical simulation methods are limited by long modeling times, random optimization schemes, results that not comprehensive. To address these issues, study introduced an innovative approach for the a GCW machine learning methods. FloPy package was used create implement MODFLOW MODPATH models. Subsequently, formulated...

Abstract Lightning matters to human life and natural fires so much that monitoring predicting lightning are highly important. A simple proxy for climatic cloud‐to‐ground (CG) density is evaluated defined as the product of convective available potential energy (CAPE) precipitation rate using data from 2005 2017 in Sichuan Southwest China. CAPE times (CP) relates monthly distribution magnitude negative basin region more closely, while CP describes positive plateau appropriately. Except...

Forecasting the electricity-to-water conversion coefficient (EWCC) can help manage and plan irrigation water in arid semiarid areas. However, EWCC is influenced by several factors, making it difficult to develop an analytical model for validation or prediction. Therefore, this study selected 206 typical wells Baicheng City conduct tests a field investigation gather information regarding results related influencing factors. Subsequently, machine learning models (multiple linear regression...

Abstract The phase behavior of polystyrene (PS) degradation in toluene was investigated a visual high‐pressure reactor. system PS and heated from room temperature atmospheric pressure to 350°C 5.0 MPa. It observed that during this process, dissolved quickly, then, the appeared be homogeneous phase, occurred system. With another batch reactor, studied range 275–360°C ranges 4.5–10.5 drop‐in molecular weights amount converted into volatile products were observed. Moreover, effects temperature,...

The cause of the failure high temperature reheater tube T23 Steel in 600MW supercritical unit a power plant was analysed by visual examination, chemical analysis, microstructural and mechanical property test (at room temperature). results showed that long-term overheating over 570 ?C (in furnace), which led to its properties decrease, resulting burst with longitudinal crack ruptures.

Through methods, such as microscope analysis, mechanical chemical metallography examination etc, the causes resulting in water wall tube bursting of 300MW station boiler have been analyzed. The raw material defects is primarily inducement failure. In welding tube, measures reducing residual stress, lower heat input, thickness layer and so on, were taken. repair succeeded greatly.

Abstract Phase change materials (PCM) are wildly investigated and used in the fields of thermal energy storage control electronics. Numerical simulation is an important method research, development, analysis design PCM based systems. At present, there two main numerical methods for solid-liquid phase transition problems with natural convection: finite volume (FVM) on macroscopic scale continuity equations, lattice Boltzmann (LBM) mesoscopic equation. In this paper, calculation...

ANSYS was used to establish the calculation model of temperature field for 9% Cr heat-resistant steel pipes in local post-weld heat treatment (PWHT). And computation has been validated experimentally. Based on numerical model, distribution simulated different pipe lengths PWHT, and effects length further studied. Results show that increase little influence equivalent measurement point, soak band (SB) width outer wall axial gradient, while it causes difference between inner reduce...

The dissimilar steel joints of austenitic stainless and low alloy are commonly used in superheaters super heaters the boiler. Carbon migration is an important factor affecting life welding during service. In this paper, carbon T23 TP304h was studied. results show that carbon-rich zone carbon-depleted formed near interface between bases weld metal. located line On other hand, at base Significant phenomenon can be observed by optical micrographs joins. morphology along fusion as a "feather"...

Failure causes on a condensate pump shaft were discussed by means of macroscopic observation, chemical composition analysis, metallurgical microstructure inspection, mechanical property tests and stress analysis. The experimental results showed that the improper material with disqualified composition, poor properties acted as inherent factor. In addition, structure design led to concentration contributed failure external Finally, fatigue fracture happened at reduce section shaft.

Leakage causes of branch pipe unit thermal networks were discussed based on macroscopic observation, chemical composition analysis, metallurgical microstructure inspection, mechanical property tests, SEM and EDS analysis. The experimental results showed that frequent contact outer wall with corrosion media fatigue load led to early crack the pipe. During compression test, propagated under increased stress burst finally. Suggestions provided prevent similar events happening.

Failure analysis on a strain clamp cracking 220kV transmission line was carried out based results of macro-observation, mechanical property examination and EDAX analysis. It is concluded that the main reason failure lies in incomplete surface cleaning during wire crimping cause large current flowing through steel cores, heating them reduced their strength. In addition, oxidation due to residue water for insufficient baking also contributes failure. Finally suggestions were put forward.

Leakage causes of boiler low temperature reheater were discussed by means macroscopic inspection, chemical composition analysis, metallurgical microstructure examination, SEM and EDS fracture analysis. Results showed that the leakage occurred for cracks originating from fillet seam ear plate. The main lie in improper structural design plate welding directly on elbow where suffered complicated stress condition, wall thinning out-of-round. In addition, as a weak zone, heat effect zone was more...

Abstract Phase change materials have important application value in the fields of heat storage, cold and thermal shock protection electronic chips. In particular, field chip protection, phase can use solid-liquid process to absorb a large amount latent heat, thereby suppressing temperature rise preventing it from overheating. At present, there are mainly three types common materials: organic, inorganic metallic materials. There exists significant difference thermophysical properties...

Fracture failure analysis on device clamp screws of one 110kV transmission line has been carried out based results macro-observation, pre-tightening test, mechanical property examination, chemical composition analysis, microstructure observation, SEM observation and EDAX analysis. It is concluded that the main reason screw fracture lies in misuse material improper heat processing which led to degradation. Suggestions are put forward finally.

The fracture causes of fixed frame bole for a B-phase spindle breakers were discussed based on results macroscopic inspection, chemical composition analysis, metallurgical microstructure examination, SEM analysis.It was concluded that the screw deformed and cracked under shock load.Suggestions provided in order to prevent similar accident.

Based on tension tests for tower bolt, it was found that the pretension increased with extension of torque retention time, and manifested characteristics decreasing at early stage then increasing later during process, provided guidance bolt fastening.

Failure reason of boiler extraction steam pipe was discussed by means macro-observation, chemical composition analysis, metallurgical and SEM microstructure examination EDS analysis. Results showed that the crack initiated from original corrosion flaw on outer wall pipe, propagated rapidly under large pressure caused water-hammer due to no drainage design in unit system until final bursting.