scholarly journals Choosing of the steam cooling technology of high-temperature areas rotors for the cogeneration steam turbine T-250-240 revisited

2016 ◽  
Vol 16 (1) ◽  
pp. 5-12
Keyword(s):  
High Temperature ◽  
Steam Turbine ◽  
Cogeneration Steam Turbine ◽  
Steam Cooling ◽  
Cooling Technology

Defect and Stress Reduction in High-Pressure and High-Temperature Synthetic Diamonds Using Gradient Cooling Technology

2020 ◽  
Vol 20 (5) ◽  
pp. 3358-3364 ◽  
Author(s):  
Ning Chen ◽  
Guoqing Zhang ◽  
Rui Li ◽  
Gang Xu ◽  
Fangbiao Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Stress Reduction ◽  
Synthetic Diamonds ◽  
Cooling Technology

Study on the Technique to Control Heat-Damage in Mine

2012 ◽  
Vol 577 ◽  
pp. 155-158
Author(s):  
Kai Zhang ◽  
Jing Shi Shang ◽  
Bin Tang ◽  
Ping Ye Guo
Keyword(s):  
High Temperature ◽  
Working Environment ◽  
Deep Mining ◽  
Circulating Water ◽  
Cold Source ◽  
Long Time ◽  
Mine Discharge ◽  
Cooling Technology ◽  
Deep Geothermal Energy ◽  
Source Form

With the increasing of exploitation scope and intensity, the deep mining would be the essential choice, where the heat-harm of high temperature becomes one of the main barriers. Through analyzing the thermal damage feature, the cooling technology were be used that put the mine discharge as cold source to control the heat harm. By disposing three main workstation, the technology can be accomplishes its operations and corresponding functions in different exploitation level. Particularly, the exchanged heat source form the workplace is taken to ground heating by the circulating water which being acted as a carrier. It show that the design concept of this technology include protect the environment and reduce the emission of deleterious air. The results of the project illustrate that the technology to control the heat-harm is efficient. The temperature of the workplace is brought down to 26-29 centigrade, and is 4-6 centigrade lower than the original, and the relative humidity is 5-15﹪ lower than before. It is greatly improves the working environment of the workplace where the heat-harm of high temperature and high humidity lasts for a quite long time. In addition， it extracts deep geothermal energy successful replacing ground fired boiler for heating, further reducing environmental pollution.

Influence of Creep on Low-Cycle Fatigue Life Assessment of Ultra-Supercritical Steam Turbine Rotor

2014 ◽  
Author(s):  
W. Z. Wang ◽  
J. H. Zhang ◽  
H. F. Liu ◽  
Y. Z. Liu
Keyword(s):  
High Temperature ◽  
Steam Turbine ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
High Temperature Creep ◽  
Cycle Fatigue ◽  
Term Operation ◽  
Start Up

Linear damage method is widely used to calculate low-cycle fatigue damage of turbine rotor in the long-term operation without fully considering the interaction between creep and low cycle fatigue. However, with the increase of steam turbine pressure and temperature, the influence of high-temperature creep on the strain distribution of turbine rotor becomes significant. Accordingly, the strain for each start-up or shut-down process is different. In the present study, the stress and strain during 21 iterations of continuous start-up, running and shut-down processes was numerically investigated by using the finite element analysis. The influence of high-temperature creep on low cycle fatigue was analyzed in terms of equivalent strain, Mises stress and low cycle fatigue damage. The results demonstrated that the life consumption of turbine rotor due to low cycle fatigue in the long-term operation of startup, running and shutdown should be determined from the full-time coverage of the load of turbine rotor.

High Temperature Rupture, Fatigue, and Damping Properties of AISI Designation 616 (Type 422 Stainless) Steel

1965 ◽  
Vol 87 (2) ◽  
pp. 325-332 ◽  
Author(s):  
R. G. Matters ◽  
A. A. Blatherwick
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Steam Turbine ◽  
Stress Rupture ◽  
Fatigue Tests ◽  
Damping Properties ◽  
Temperature Range ◽  
Stress Ratios ◽  
Mean Stresses ◽  
Turbine Blading

This paper covers the high temperature rupture, fatigue, and damping properties of AISI Designation 616 (Type 422) steel conforming substantially to the requirements of ASTM specification A437 grade B4C. This material has been extensively used for boiling and for steam turbine blading for service in the temperature range of 850 to 1000 F. The results of stress rupture and fatigue tests of smooth and notched bars at 800, 950, and 1050 F are presented. Stress rupture tests extend to 2000 hr or more and fatigue tests generally extend to 2 × 107 cycles or about 100 hr. The fatigue tests were performed in a direct stress machine at stress ratios A = infinity, 2.5, and 1.0. Vibration decay damping tests with various mean stresses were performed at 75, 800, 950, and 1050 F.

scholarly journals Composite design and thermal comfort evaluation of safety helmet with PCM cooling

2020 ◽  
pp. 250-250
Author(s):  
Wentao Hu ◽  
Zu`an Liu ◽  
Meng Yuan ◽  
Ying Peng ◽  
Xi Meng ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Cooling Effect ◽  
Absorption Cooling ◽  
Temperature Environment ◽  
Cooling Technology ◽  
Fan Cooling ◽  
Change Material ◽  
High Temperature Environment

Higher temperature and humidity will adversely affect the thermal comfort of helmet users. In order to improve the comfort level of the helmet and obtain an optimal cooling helmet model, four kinds of helmet models were established by using phase-change material (PCM) heat-absorbing cooling technology and fan cooling technology. Through the air conditioning system, the working states of four kinds of helmet models in the thermal environment of 30? were simulated, and the thermal comfort of four kinds of helmet models was evaluated. The results show that: high temperature environment is an important factor affecting the cooling effect of fan helmet (b) fan, Under high temperature environment, the helmet with fan cooling technology has a certain cooling effect in the early stage, but after 30 minutes, the cooling effect becomes worse and worse. Under high temperature environment, PCM safety helmet (c) has a good cooling effect, but poor ventilation results in the excreted sweat clinging to the scalp and hair, resulting in a poor user experience. There are defects in using phase-change material (PCM) heat absorption cooling technology or fan cooling technology alone. The helmet (d) combines PCM heat absorption cooling technology with fan cooling technology, so that the cooling effect and internal thermal environment stability of the helmet are the best, and the thermal sensation of human body is the best. Therefore, the helmet (d) is an optimal design model.

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