De-icing Device Research Articles

Analysis and Research on Energy Consumption of a Non-Contact High-Efficiency Tunnel De-Icing Device

In this paper, a laser deicing device for tunnel is designed to solve the inconvenience of deicing the tunnel roof wall. First of all, Solidworks software was used to create a 3D model of the laser deicing device, namely the track module, the base platform, and the work platform. Then, ANSYS simulation software is used to simulate the process of laser deicing. When the initial temperature of icicle is -5℃, -10℃, -15℃ and -20℃, the distance between laser and icicle is 1.5m, 2m, 2.5m and 3m, and the wind speed is 2m/s, 3m/s, 4m/s and 5m/s, respectively. The depth of 200s of laser irradiation and the time of full penetration were simulated under three variables. It is concluded that the higher the initial temperature, the closer the distance and the smaller the wind speed, the lower the deicing energy consumption. Finally, the experiment results are consistent with the simulation results, which further verifies the accuracy of the simulation. The laser deicing detection device studied in this paper provides a certain theoretical basis and reference value for the application and development of intelligent deicing equipment in tunnels.

Multilayer assembly of strong and tough MXene/cellulose films for excellent electromagnetic shielding

The prosperity of modern communication and wearable electronics has greatly necessitated the development of films that could feature both electromagnetic interference shielding and mechanical flexibility. Inspired by the strong interaction between cellulose nano fiber (CNF) and MXene nanosheet, as well as the unique magnetism of Co/C nano particles, here we report a series of CoC@CNF/MXene films prepared through alternative vacuum filtration. Owing to the unique alternative multilayered structure, where the conductive MXene nanosheets are selectively distributed between magnetic CoC@CNF layers, the resultant CoC@CNF/MXene multilayer film presents a maximum EMI SE of 37.1 dB, together with extremely high absorption capacity (over 95 %). Meanwhile, excellent electro-thermal conversion capacity that allows for fast thermal response (5 s) is achieved. Benefiting from this, a portable and low voltage-driving deicing device was successfully designed. Moreover, the satisfying flexibility has enabled these multilayer structured films to sustain repetitive bending, folding and shaping. Herein, this research has opened up new horizon in seeking both superior EMI shielding and mechanical performance through design of multilayered structure, which will further benefit the development of MXene‑based composites for high-performance electronic devices.

Research on the simulation of SVG for online de-icing on distribution lines

The distribution network connects with families, more branch circuit breakers, more and more users rely on power in winter, which requires higher and higher reliability requirements for power supply. The power supply department is facing greater pressure to stop distribution line for de-icing. In view of the above reasons, this paper first briefly introduces several measures of de-icing without power failure, and selects the technical route of injecting reactive power at the end of the line for online de-icing; secondly, it introduces the principle of SVG device generating reactive power, which uses reactive power to generate heat loss in the distribution network line for on-line de-icing, and then proposes an improved reactive power outer loop control strategy to make it equivalent to current source De-icing device; Finally, a simulation model is built in PSCAD. Taking a 5km ACSR (LGJ-120) line with 5.4Mvar reactive power injected at the end of the line as an example, it can be seen that the line current reaches more than 500A due to the injected reactive power. The simulation results prove the effectiveness of the method. Considering its economy, it provides a feasible way for the distribution network with important loads Electric deicing scheme.

Bi2Se3 nanosheets-based photothermal composites with hydrophobic surface for synergistic anti-/de-icing

Ice accumulation-induced damage to outdoor equipment such as wind turbine blades, aircraft and weaponry has been a long-standing concern. The traditional two-dimensional (2D) photothermal nanomaterials, which are extensively applied for de-icing, have strong phonon diffusion and high thermal conductivity, causing great heat loss and limit the application in the field of heat retention. Herein, Bi2Se3 nanosheets with photothermal effect are selected in terms of solar harvesting and heat loss reduction, endowing the composite membrane with outstanding light absorption (over 90%) and low thermal conductivity (0.054 W (mK)−1). The real-time conversion of solar-heat-electricity is further recorded, demonstrating an electrical output power density of about 110.5 μW cm−2. Furthermore, rose petals-like surface is fabricated by using fabric as a template in a scalable way and the slippery coating is prepared via in-situ growth of octadecyltrichlorosilane. Such structural design enables membrane desired hydrophobicity (contact angle 137°), which lead to the shedding of water and melted ice. This kind of anti and de-icing device can provide a valuable guidance for the design of sustainable and intelligent device in the future.

Performance Analysis of Electro-Impulse De-icing Device for Overhead Ground Wire

Performance Analysis of Electro-Impulse De-icing Device for Overhead Ground Wire

Fault Location Scheme for Abnormal Grounding Point in Isolated Ground Wire of Large-Scale Clean Energy Transmission

There is a large number of grounding switches along the isolated ground wire for the de-icing in the large-scale wind farm. If any of these grounding switches are left open by accident, this can create an unexpected abnormal grounding point in the isolated ground wire. Based on the analysis of the output power of de-icing devices, the output power of different poles can be applied for the abnormal grounding point fault location. Since the rise of output current to the rated current of de-icing devices requires a long time to build up, the protective relay may lock the de-icing device before the output current reaches the rated current. Thus, the ratio of output energy of two poles can be selected to locate the abnormal grounding point. This study verified this location method by conducting a large number of simulations.

Cable deicing device based on ice melting and mechanical ice breaking

In recent years, it is not uncommon for high-voltage cables to freeze and break due to extreme weather, which has a great impact on power transmission and caused countless economic losses. At present, the de-icing methods on the market all have certain limitations. Therefore, this paper designs a de-icing device that uses thermal ice melting and mechanical ice breaking at the same time, which can reduce the difficulty of ice breaking and damage to cables by heating ice layers, and spray special coatings to prevent icing again after ice breaking. This device has higher adaptability to cable de-icing and can better meet the needs of de-icing.

Modeling and optimizing a road de-icing device by a nonlinear heating

In order to design a road de-icing device by heating, we consider in the one dimensional setting the optimal control of a parabolic equation with a nonlinear boundary condition of the Stefan–Boltzmann type. Both the punctual control and the corresponding state are subjected to a unilateral constraint. This control problem models the heating of a road during a winter period to keep the road surface temperature above a given threshold. The one-dimensional modeling used in this work is a first step of the modeling of a road heating device through the circulation of a coolant in a porous layer of the road. We first prove, under realistic physical assumptions, the well-posedness of the direct problem and the optimal control problem. We then perform some numerical experiments using real data obtained from experimental measurements. This model and the corresponding numerical results allow to quantify the minimal energy to be provided to keep the road surface without frost or snow.

Study of Shape Memory Alloy De-icing Device for Nonrotating Components of Aircrafts

Shape memory alloy (SMA) is a promising material which has widely been applied in aerospace industry. Its unique nature of the high stress output rate and low power requirement agrees the need of energy saving in aircraft de-icing. Among the few designs of the SMA de-icer, Gerardi’s project for rotating blade is more fit to the requirement of the de-icer for aircrafts. However, it is not clear that if the de-icer is capable to de-icing for non-rotating components or not. In this study, design of the SMA de-icer for non-rotating components were presented. Characteristics of the SMA de-icer and factors influence on it were confirmed by numerical methods. The major results show that the SMA de-icer can achieve de-icing objective well. De-icing rate of 100% can be obtained. For the designed SMA de-icer, pre-strain of 4% of the SMA sheet is recommended. Thinner SMA sheet helps greatly improve de-icing performance of the SMA de-icer.

Research Situation of Deicing Device of Transmission Line Deicing Robot

It is serious harm of icing of transmission lines for power system. Deicing robots can replace manual methods, and it is the developmental tendency of transmission lines deice. Recent achievements of the deicing robot were reviewed, focusing on the research of deicing device, which provides technical reference for the design of deicer.

Efficiency Analysis on the Synthetically De-Icing Technology Combining Thermal Water-Jet Cutting with Mechanical Milling

Transportation always plays a significant role in national economy, of which roads and bridges are the most important facilities. The conditions of the road surface have an overwhelming influence on the traffic flow and road safety, especially in winter and the regions with frequent snowfall, thus closely affected the development of the urbanization and economic prosperity. In view of this, this article has analyzed the characteristics of the existed de-icing technologies, coming up with a new synthetically de-icing method which consists of thermal water-jet cutting with mechanical milling technology. These two kinds of de-icing methods are combined as a set of multi-functional system, in which the thermal water-jet cuts the ice layer into separated sections, and the mechanical milling unit then easily removes the remaining sections out of the road. To obtain the prime influential factors in this new de-icing device, repeated indoor experiments were conducted, which provides some theoretical references to further advance the de-icing efficiency and make structural optimization.

R&D of a New De-Icing Device Based on Synthetically De-Icing Techniques

The thermal water-jet technology and mechanical milling method are comprehensively applied in the design of the new de-icing device. These two kinds of de-icing methods are combined as a set of multi-functional system, in which the thermal water jet cuts the ice layer into separated sections, and then the mechanical milling unit can easily remove the remaining sections. To obtain the affecting factors in the new de-icing device, repeated indoor experiments were conducted and the data was analyzed, which would provide some theoretical references to further optimize the design.

Modelling the Dynamic Response of Iced Transmission Lines Subjected to Cable Rupture and Ice Shedding

This study is concerned with accurate numerical modelling of the propagation or progression of ice-shedding phenomena and resulting forces in overhead lines following an initial trigger, such as a controlled shock load applied locally with a cable de-icing device, or uncontrolled shocks due to cable rupture. The ice failure criterion used for the ice deposits in the simulations is based on a maximum effective plastic strain limit. This criterion has been verified in models of reduced- and real-scale single spans subjected to shock loads. After showing the improved performance of this ice failure model, it is applied to the case study of a 120 kV two-circuit line section that failed during a localized ice storm event in 1997. A nonlinear dynamic analysis of the line section is performed which considers ice-shedding effects following the conductor ruptures. The results confirm that considering ice-shedding effects in the iced spans subjected to cable rupture is essential to predict the general dynamic response of the line as the cable ruptures may induce ice shedding. The improved performance of the modelling procedure described in this paper can have practical use in the design of transmission lines in industry.

Design and Analysis of High-Tension Lines De-Icing Device

To overcome the problem of the de-icing for high-voltage wire which is nowadays done artificially and dangerously, a kind of impact type de-icing device was designed in this paper. A cam and de-icing tool are designed specially for the device. The device can conduct deicing operation automatically and realize the automatic reciprocating walking on the transmission line. In conclusion, the impact type de-icing device for transmission line can effectively solve the problem of the ice coating on the transmission line and has a large value of reference and promotion.