In order to figure out the burnout problem during grinding process, a novel method about enhancing heat transferring in the contact zone by incorporating a revolving heat pipe inside the wheel disk has been proposed. By designing the structure and analyzing the heat transfer process of heat pipe grinding wheel (HPGW), factors as working fluid kind, fluid loading and rotating speed are determined to be the main factors that may affect its heat transfer capacity. Heat transfer analysis experiments were complemented on a self-designed experiment platform, on which the influences of different factors are investigated. According to the results of the heat transfer analysis experiments, a CBN HPGW injected with 18 g distilled water is fabricated and applied in creep feed grinding of Inconel 718. The results are compared with non-HPGW in terms of the average temperature in the contact zone, workpiece surface quality, microstructure and micro-hardness of the ground workpiece surface and the grinding wheel surface. Results show that the temperature in the contact zone can be controlled below 60℃ when using HPGW, while sever burnout happened when using non-HPGW at the same conditions, which confirmed the excellent heat transfer performance of HPGW.

Water-bloom is easy to break out in scenic water which utilizes reclaimed water as source water.Constructed wetland is a common bioremediation technology for reclaimed water reuse in landscape.There were some disadvantages in constructed wetland,such as plants weren't harvested caused by insufficient operating cost,and amount of nutrients absorbed by plants was small.Pilot test was carried out in the hybrid willow(S.matsudana Koidz) and yellow iris(Iris wilsonii) in R&D center in Beijing Drainage Group.Combined with previous researches,the results show that: hybrid willow(S.matsudana Koidz) grew well in constructed wetland;removed total of nitrogen is 10.8 g / m2,of phosphorus is 1.89 g / m2.This effect is better than traditional wetland plants.Therefore,hybrid willow is an excellent wetland plant.In the future,aim to upgrading wetlands effectiveness and reducing operating costs,woody plants with economic value is a research direction in constructed wetland.

Three dimension heat transfer model is built based on FEM.By changing the structural parameters,rotation speed of the grinding wheel and heat flux,the analysis of the effects on the temperature field of the heat-pipe grinding wheel is carried out.The temperature field contour maps are obtained.The results show that it's feasible to control the temperature of grinding zone by heat-pipe structure.Higher heat flux causes higher temperature of grinding zone.The temperature of grinding zone may be decreased by reducing the thickness of the outside wall and enhancing the rotation speed.