The issue of corrosion failure in offshore wind turbine steel pipe piles has become increasingly evident, posing a significant threat to the safe operation of offshore wind energy systems. To address this, the applicability of light-curable anti-corrosive coatings in tropical marine atmospheric conditions was investigated in this study. Firstly, the bending and tensile properties of the light-curable composites were tested. Then, salt spray tests, as well as acid and alkali resistance tests, were carried out on the light-cured sheets. Results showed that the mechanical properties and neutral salt spray (NSS) resistance of the light-curable materials were excellent, and their resistance to neutral salt spray was found to be comparable to that of Anshun armor. In H2SO4 and NaOH solutions, the weight gain rate of the light-curable materials was found to be less than 1.2%, the hardness variation rate was less than 8%, and the bending strength retention rate exceeded 92%, demonstrating its excellent acid and alkali resistance. The light-curable materials met the requirements of anti-corrosion materials for offshore wind power equipment.

采用BNi-2薄带钎料对1Cr18Ni9Ti进行了钎焊,分析了接头的显微组织、电化学特性、硬度和拉伸性能.通过盐雾腐蚀试验,研究了腐蚀过程中接头组织和力学性能的演变.结果表明,1Cr18Ni9Ti钎焊接头成形良好,焊缝两侧的显微硬度明显高于母材.焊接接头的抗拉强度达到500 MPa.接头焊缝的腐蚀电位高于1Cr18Ni9Ti母材,接头在盐雾环境中发生电偶腐蚀.力学性能测试结果表明,未腐蚀的钎焊接头拉伸试验后断裂发生在带有钎料的母材处,断口分析表明,拉伸过程中接头涂有钎料的母材首先形成多道裂纹,然后扩展到母材发生断裂,具有明显的塑性变形.1Cr18Ni9Ti钎焊接头经过盐雾腐蚀后,接头力学性能下降,拉伸试验后断裂发生在钎焊焊缝处,无塑性变形特征.

Corrosion and protection of offshore wind turbines is one of the difficulties in the development of offshore wind power. In this paper, the corrosion status of offshore wind power was analyzed, the relationship between offshore wind turbine structure and marine corrosion environment was expounded, and the corrosion characteristics and corrosion types of wind turbine components were described. Besides, dealing with offshore wind power corrosion from two aspects including corrosion protection and corrosion monitoring was analyzed. As for anti - corrosion of offshore wind power, the design criteria, standard requirements and control methods for corrosion control of offshore wind power were proposed. As for offshore wind power corrosion monitoring and inspection, the corrosion detection technology and monitoring technology were introduced, the main components and basic principles of online corrosion monitoring technology of wind power were emphatically described, and finally, the future online corrosion monitoring work was prospected.

As a new type of combustion device, circulating fluidized bed has overcame many disadvantages of coal fired industrial boilers. It has improved combustion efficiency and reduced pollutants.The heat transfer characteristics related to fluidized bed are expensive and are subject to environmental conditions.The FLUENT17.0 software is used as a platform for numerical simulation to solve.Numerical simulations are based on experiments by Tong Zhao et al. A simplified two-dimensional structure of circulating fluidized bed is applied to simulate the internal flow process and combustion process, and the heat transfer problem of fluidized bed is further studied. Based on the heat transfer model, the influence of the bed temperature and radiation heat transfer on the total heat transfer coefficient is researched.After theoretical calculation, the three distribution laws of heat flux density along the height direction of reactor are found, which provides reference for optimization reference.

The biomass gasification technology is an effective way to realize synthetic utilization for agricultural and forestry residues,and is significative in both energy saving and environmental protection.It is a technologic innovation to produce activated carbon from the charcoal after gasifying,in which the residues of gasification are endowed with high added value;Activated carbon was preparated from gasified pine branches charcoal using high temperature superheat steam.The effect of activation factors on the iodine value and average yield rate of activated carbon was analyzed via orthogonal design method.The best activation condition was determined;The best quality of the activated carbon is gained,when the temperature,time and vapour flux are 600℃,180 minutes and 45kg/h respectively.

Considered with carbon partial gasification and the heat loss of gasifier during the gasification process,modified the equilibrium constant of the methanation reaction.A modified thermodynamic equilibrium model based on material balance,energy balance and chemical equilibrium for predicting the performance of a downdraft biomass gasifier with high temperature air was developed.The calculated results were satisfied with the experimental data reported in reference literature well.The modified model was then used to study the effects of the air temperature,moisture content of biomass and equivalence ratio on the gas composition,calorific value and gasification efficiency.The results showed that the higher air temperature and lower moisture content were better for gasification;the results also indicated that the optimal equivalence ratio was 0.34.

The novel fixed bed biomass gasifier,which was manufactured by ourselves,was introduced in this paper.The gas from the reduction flowed through the oxidation zone to reduce content of tar and fly ash.Also,the high quality charcoal was produced as byproduct by it,which had a higher energy conversion efficiency.This gasifier could be used for generating power by SI engine and the activated carbon manufacture.Based on material balance and exergy of the gasifier,the exergy was analyzed,the weakness was pointed out,the project of modification was discussed.By the experimental results of the five experimental case,the effect of ER on gas content,gas heating value,gasification efficiency and energy conversion efficiency was analyzed.The best operating condition was found.

A model was developed for a new uniaxial sunlight-tracking vacuum trough-focus solar collector with heat pipes to analyze the thermal and exerg efficiencies of the collector. Then, the main influencing factors on thermal and exergy efficiencies were presented, such as geometric concentrating ratio, illumination intensity and temperature rise of heat-collecting fluid. The results indicated that with the increasing geometric concentrating ratio and solar illumination intensity of the collectar, the thermal and exergy efficiencies both increase rapidly first then gradually tend to flat curve. When the temperature of heat-collecting fluid increases, the thermal efficiency decreases slowly, and the higher the geometric concentrating ratio and illumination intensity, the slower the decreasing rate.

2D mathematical model was created on the basis of heat pipe evacuated tubular structure and the proper hypothesis of boundary condition;FLUENT software was used to simulate the heat transfer progress in the pipe,post the distributing orderliness of temperature field and flow field,and analyze the influence factors of temperature field and flow field for supplying theory gist for the design and optimisation of heat pipe evacuated tubular collector.