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Gao G.-F.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

The rotating speed of rotating machines such as steam turbines and gas turbines etc. is regarded as a most important parameter. When used for measuring a rotating system, the magnetoelectric type sensors feature such merits as a strong anti-interference capability, impossibility of being influenced by the air pollution at the testing site, a small change in temperature and pressure, and oil dirt and light exercising no influence on data acquisition etc. Therefore, the foregoing sensors are widely used in various domains. During the calibration of magnetoelectric type sensors, there exist universally a big error, and the measurement precision can not meet technical requirements. In the light of such a practical problem, the author has proposed a method, i. e. under the precondition that the gear weight is guaranteed not to exceed the allowable load, the thickness of the wheel disk teeth is optimized as far as possible to enhance the measurement precision. Practice has proven that the method is feasible. The reliability monitoring data show that the improved rotating speed measurement precision can meet the technical requirements. The product quality can be fully verified and technically guaranteed.


Shao Y.-X.,Harbin Engineering University | Xu W.-Y.,Harbin Engineering University | Li Y.-J.,Harbin Engineering University | Wang K.-F.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

Established was a three-dimensional solid model for small-sized supercharged boilers and determined were the mechanical and thermal loads in various zones in the drum. On this basis, the stress field of the drum shell was numerically calculated during the stable operation of the boiler and a strength evaluation of the drum shell was performed according to the calculation results. It has been found that the total stress of the drum shell has a maximum value of 106.6 MPa, which is far less than the stress permitted by the material used at the working temperature, thus the drum shell having a relatively large safety allowance. ©, 2015, Harbin Research Institute. All right reserved.


Wang P.,Harbin Engineering University | Meng H.,Harbin Engineering University | Zhang W.,Csic No 703 Research Institute | Dai R.-H.,Naval Representative Office Resident In Harbin No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

In marine steam power plants, the pressure and water level in deaerators are correlated and have a strong coupling property. As a result, it is very difficult for the traditional PID control to achieve satisfactory control effectiveness and it is mandatory to take corresponding decoupling measures. PID type neural networks not only have the merits of the traditional PID control but also have an ability of performing a self-learning and approaching to any function. A model for the pressure and water level in deaerators was established and through establishing a neuron corresponding to the proportional, integral and differential control, the PID control and the neural network were integrated and a PID type neural network decoupling control method was proposed. By making use of the model thus established, a simulation by using the PID type neural network decoupling control method was performed. It has been found that compared with the single loop PID control method, the method in question boasts a better decoupling result, the stabilization time durations of the pressure and water level in the deaerator can be shortened by 100 s and 60 s respectively and both overshoots can be reduced by 0.6 KPa and 0.005 m respectively. © 2015, Harbin Research Institute. All right reserved.


Jiang B.,Northwest University, China | Luo K.,Northwest University, China | Zheng T.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

To study the flow field and aerodynamic loss characteristics of a miniature impulse type partial admission turbine and then offer guidance for design of a miniature turbine for use in a underwater navigation vehicle, a simulation model for 2 kW class turbines was established and the reliability of the model was verified through a contrast with the results obtained from the literatures. Through changes in the blade tip clearance, axial clearance between the outlet of the nozzles and the rotating blades, divergence angle of the nozzles, partial admission degree and wheel disk structure, the aerodynamic loss of the turbine was studied. It has been found that the miniature turbine has a dimensional effect, which reflected by the fact that the acoustic velocity point in the nozzle shifts to the downstream of the throat of the nozzle and changes in the pressure on the surfaces of the working blades are relatively identical. With an increase of the geometrical parameters above-mentioned, the influence of the blade tip clearance on the inner efficiency of the turbine will be most conspicuous and the influence of the axial clearance, however, can be ignored. When the partial admission degree is 0.35, the rise in the inner efficiency will tend to be stable and smooth. When the divergence angle of the nozzle is 8 degrees, the inner efficiency of the turbine is higher than that when the partial admission degree is 6 and 10 degrees respectively. When no blade tip clearance is present, the friction loss of the wheel disks not including the blades is about 1%. © 2015, Harbin Research Institute. All right reserved.


Wang R.,Inner Mongolia Jinglong Power Generation Co. | Li C.-G.,Heilongjiang Provincial Thermal Power No. 3 Engineering Co. | Chen X.-H.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

The original design of the air heaters of 2×600 MW boiler units in Jinglong Power Plant was horizontal and non-adjustable and the water drainage system adopted the traditional arrangement mode in operation: "water drain pump→deaerator", which often caused a series of problems such as the water drained from the air heaters was not smooth and free in flow and the water drain pumps malfunctioned during operation, needing a great deal of maintenance expense in each year. Through a modification of the air heaters and steam traps, rearrangement of the water drainage system, optimization of its operation logic, the reliability and cost-effectiveness of the air heater and water drainage system were enhanced, thus saving a cost of RMB 700000 yuan in each year. The forgoing can offer certain reference for power plants being under construction or in operation.

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