Csic No 703 Research Institute

Harbin, China

Csic No 703 Research Institute

Harbin, China
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Zhang S.-K.,CPLA Naval Representative Office Resident at Dalian No. 426 Works | Kang L.,Csic No 703 Research Institute | Zhang H.-R.,Csic No 703 Research Institute | Xu L.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

For a marine turbine shafting system, a turbine rotor, transmission shaft and sun wheel coupling model was established. Under various supporting conditions, the rotor dynamic characteristics of the shafting system were studied. The curves showing the vibration patterns and the unbalance amplitudes of the shafting system under the condition of shafting system being supported by a round pad bearing or a damping bearing were obtained and the difference between the responses in both supporting modes was analyzed with a safe operation range of the shafting system being given. It has been found that under the condition that the length of the transmission shaft is shortened and the connection stiffness of the coupler is enhanced, the critical speed of the shafting system can increase to a speed higher than the working speed, thus improving the dynamic characteristics of the shafting system. © 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.


Kang L.,Csic No 703 Research Institute | Yu J.-F.,Csic No 703 Research Institute | Wang C.,Csic No 703 Research Institute | Liang Y.,China Electrical Power Engineering Co.
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

In the light of such operation characteristics of marine steam turbines as off-design operating conditions and a big wetness in several stages before the last one, dynamically optimized was the long blades in the last stage of a steam turbine and air-blowing tests were performed of the prototype and retrofitted totaling two cascades on an annular cascade test rig at three mach numbers at the outlet and at five attack angles. It has been found that with an increase of the Mach number after the cascades, the location of the lowest pressure point on the suction surface of the blades will shift rearwards, the pressure dropping section in the front half section of the cascades will become longer, the pressure gradient along the pressure dropping direction increase, the boundary layer become thinner and the blade profile loss decrease. The secondary flow loss on the outside end wall of the rotating blades after the retrofitting will markedly drop and enhance the applicability to attack angles. The positive and negative attack angles will only affect the static pressure distribution on the suction surface or pressure surface at the leading edge of the blades. At any Mach number, any increase in the absolute attack angle will all lead to an increase of the loss in the cascades.


Zhang X.,University of Science and Technology Beijing | Zhang X.,China International Engineering Consulting Corporation | Cang D.-Q.,University of Science and Technology Beijing | Wang J.-F.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

For low temperature heat sources at a temperature from 313.15 K to 413.15 K destined for power generation, analyzed was the thermodynamic performance of an organic Rankine cycle system through establishing a thermal model for such kind of system and setting the thermal calculation conditions for the system. On this basis, the authors arrived at the following conclusion that (1) to change the influence of the evaporation temperature of the working medium on the net output power, quantity of heat absorbed, exergy loss, thermal efficiency and exergy efficiency of the system necessitates to choose the working medium suitable for the heat source in order to achieve a relatively big utilization efficiency; (2) at a certain temperature of a heat source, the higher the evaporation temperature of the working medium, the more favorable for enhancing the thermal efficiency and exergy efficiency of the system. Under the condition of identical operating conditions, the organic working media R601, R245fa, R245ca and R141b have a relatively good work-doing ability, thus the economic benefits will be relatively good. ©, 2015, Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power. All right reserved.


Gu Y.-Y.,Csic No 703 Research Institute | Li L.-C.,Csic No 703 Research Institute | Zhang S.-J.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

With a gas-fired boiler combustion system serving as the object of study, the intelligent PID control algorithm was used to improve its control system. The fuzzy self-adaptive theory was used in combination with the BP neural network theory, genetic algorithm theory and PID control theory to design the control system. By using the software Matlab, a simulation and verification were performed respectively and a contrast with the simulation curves obtained from the traditional control systems and analysis were conducted. It has been found that the intelligent PID control is obviously superior to the traditional PID control, thus offering a theoretical basis for adopting the intelligent PID controllers in gas-fired boiler combustion control systems in industrial processes. ©, 2015, Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power. 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.


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.


Du X.-J.,Csic No 703 Research Institute | Chen M.,Csic No 703 Research Institute | Liu L.-H.,Csic No 703 Research Institute | Hu W.,Csic No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

Under the condition of the furnace pressure undergoing a change, systematically analyzed was the variation regularity governing the relevant thermal calculation parameters of a turbocharged boiler. A case calculation was performed of a certain type of turbocharged boiler and the curves of its flue gas flow velocities and furnace blackness changing with its furnace pressure were obtained. When its furnace pressure increases, its volumetric thermal load and furnace blackness will also increase. The flue gas temperature and linear flow speed at the outlet of the furnace etc. will decrease and the convection heat exchange coefficient and other parameters of the flue gas, however, will maintain unchanged.


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.

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