North China Electric Power University

Beijing Jiaotong University

Guodian New Energy Technology Research Institute Co., Ltd.

Xiangyu Han

Zhenyu Chen

Zhifeng Hu

Hong Yao

Zhen Xie

Chenzhi Qu

Gengda Li

Xiongwei Li

Chuanxi Wang

Fangxu Jia

Baohong Han

Tianyi Yang

Ning Mei

Zhongwei Lin

Qingru Cui

Xingcheng Zhao

Disclosed are a system and method for efficient nitrogen and carbon removal and phosphorus recovery of source-separated fresh urine by biochemical combination. The system includes a functionally zoned membrane aerated biofilm reactor for in-situ nitrogen and carbon removal, a source separation toilet, a source-separated urine storage tank, a phosphorus recovery reactor, a calcium salt solution tank, a water production tank, and a control system. The membrane aerated biofilm reactor is divided into an upper part and a lower part, a micro-aerobic environment is formed in the upper part while an anaerobic environment is formed in the lower part, and thus nitrogen and carbon can be removed only in the membrane aerated biofilm reactor. The system disclosed by the present disclosure can achieve the goal of removing nitrogen and carbon by 95% and more without additional carbon source, and can meet the demand of in-situ sewage treatment on a train.

System and method for efficient nitrogen and carbon removal and phosphorus recovery of source-separated fresh urine by biochemical combination

The disclosure proposes a yaw calibration method and system for a wind turbine. The calibration method includes: establishing a cylindrical coordinate graph of wind resource distribution based on historical wind farm operation data, to determine a wind direction interval of main inflow wind conditions of a wind farm; calculating an effective value of active power of each wind speed sub-interval, and obtaining a fitted power curve of each refined interval through curve fitting; and setting an angle between a central axis of a refined interval for a fitted power curve corresponding to a calibration curve in each wind speed range and a central axis of the to-be-calibrated wind direction interval as a yaw error calibration value in the wind speed range, to establish a wind speed-yaw error calibration value lookup table; and determining a yaw error calibration value under a current wind direction and a current wind.

Yaw calibration method and system for wind turbine

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Beijing, China

Xiangyu Han