scholarly journals THE VERIFICATION OF THE RSG-GAS REACTOR COOLING TOWER HEAT TRANSFER CAPACITY

2021 ◽  
Vol 15 (1) ◽  
pp. 27
Author(s):  
Abdul Aziz Rohman Hakim
Keyword(s):  
Heat Transfer ◽  
Performance Test ◽  
Cooling Tower ◽  
Theoretical Calculations ◽  
Cooling Water ◽  
Secondary Cooling ◽  
Heat Transfer Capacity ◽  
Gas Cooling ◽  
Technical Specifications ◽  
Power Operation

The RSG-GAS reactor has been replaced and the technical specifications for the new cooling tower specify that the heat transfer capacity from the secondary cooling water to the environment is 5500 kW per module. Therefore, this study aims to verify the theoretical calculations of the heat transfer capacity using performance test data collected on the 30 MW power operation on December 20, 2018, such as the temperature of the primary and secondary coolant entering and exiting the cooling tower, wet bulb, and environmental dry bulb temperature, as well as the inlet and outlet air temperature. Furthermore, the data were used to calculate the heat transfer capacity from the secondary cooling water to the environment. The results showed that each cell of the RSG-GAS cooling tower reactor transfers the heat of approximately 5528.52 kW. This value is consistent with the technical specifications written in the revised RSG-GAS Safety Analysis Report 11.

Metallurgical Secondary Cooling of Continuous Casting Based on Neural Network Adaptive System Design of Water Distribution

2014 ◽  
Vol 926-930 ◽  
pp. 802-805
Author(s):  
Jun Li Jia ◽  
Jin Hong Zhang ◽  
Guo Zhen Wang
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Water Distribution ◽  
Cooling System ◽  
Control Level ◽  
Cooling Water ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Secondary Cooling ◽  
Water Control

Efficient secondary cooling water control level slab continuous casting process and quality are closely related. Casting solidification heat transfer model is the basis of process control and optimization, heat transfer model based on determining the secondary cooling system is the most widely used method for casting production process can be simulated. However, when considering the many factors affecting the production and input conditions change significantly, real-time and strain of this method is not guaranteed. Therefore, the artificial intelligence optimization algorithms such as genetic algorithms, neural networks, fuzzy controllers, introducing continuous casting secondary cooling water distribution and dynamics of optimal control methods, the rational allocation of caster secondary cooling water and dynamic control is important.

Numerical Simulation of Billet Continuous Casting Solidification Based on the Measurement of Shell Thickness and Surface Temperature

2011 ◽  
Vol 80-81 ◽  
pp. 81-85
Author(s):  
Jiao Cheng Ma ◽  
Hui Zhao Sun ◽  
Xue Bin Wang ◽  
Xia Lv
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Surface Temperature ◽  
Shell Thickness ◽  
Casting Machine ◽  
Cooling Water ◽  
Solidification Process ◽  
Transfer Model ◽  
Secondary Cooling ◽  
Billet Continuous Casting

In order to more accurate simulation the solidification of billet continuous casting. The measured shell thickness and surface temperature have been used to revise the heat transfer model. The calculated results of the model are in excellent agreement with the experimental ones based on an actual casting machine. The revised model can excellent to simulate the billet solidification process. So it provides the possibility for better simulation the dynamic solidification process and optimizing of the secondary cooling water.

scholarly journals A CASE STUDY ON MAINTENANCE OF OVERHEAT - SPOT WELDING MACHINE

2018 ◽  
Author(s):  
Dessy Agustina Sari
Keyword(s):  
Heat Transfer ◽  
Spot Welding ◽  
Cooling Tower ◽  
Cooling Water ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Time Production ◽  
Standard Temperature ◽  
Standard Operation

Indicator overheat on robot transformer of spot welding was gun thermos alarm. Thermostat which adheringin the machine could be shut down the robot if this component detected the excessive warm below the standard operation. Impurities (scale, and deposit) existence caused heat transfer process disturbed, exchanged thermal between cold and hot water. This research methods were replacement part filler of the cooling tower and flushing the pipeline by chemical. The result showed a step progressing which cooling water reached the standard temperature, 30oC. Performance spot welding was being better so time production worked normally.

Numerical Modeling of Water Impingement and Heat Transfer With Solid Slabs During Secondary Cooling in a Continuous Caster

2018 ◽  
Author(s):  
Haibo Ma ◽  
Kaile Tang ◽  
Rui Liu ◽  
Michael Lowry ◽  
Armin Silaen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Continuous Caster ◽  
Cooling Water ◽  
Heat Removal ◽  
Heat Transfer Process ◽  
Standoff Distance ◽  
Slab Surface ◽  
Secondary Cooling ◽  
Cooling Effects

In the steel continuous casting process, cooling water is directly injected through multiple rows of nozzles to remove heat from the slab to allow the slab to solidify in secondary cooling. Effective heat removal from the slab without causing slab cracking and deformation is desired. The present study focuses on developing a reliable numerical model which can accurately predict the impingement and heat transfer between water droplet and solid slab. The flat fan atomizer is chosen as a representative nozzle to be simulated. The spray pattern on the slab surface, as well as the impingement behaviors of water droplets, are obtained through an Eulerian-Lagrangian approach. The wall jet model coupled with modified evaporation rate depending on the droplet Weber number has been applied in the numerical model. A series of parametric studies have been performed to investigate the effects of spray direction, standoff distance, and distance between adjacent nozzles on the impingement heat transfer process. Simulation results reveal that intense cooling effects can be found in the center of the spray, where the concentration of droplets is the highest regardless of the spray direction. Double the standoff distance can reduce the heat transfer coefficient on slab surface by 10%. Finally, the distance between two adjacent nozzles should be adjusted to be smaller than the standoff distance in order to avoid the “fountain” effect induced by the collision of the two neighboring wall jets.

scholarly journals Evaluation of Bio-Fouling Effect in Cooling Tower by Chemical Treatment

2019 ◽  
Vol 8 (3) ◽  
pp. 374-378
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Pilot Plant ◽  
Cooling Tower ◽  
Thermal Power ◽  
Cooling Water ◽  
Large Power ◽  
The Cost

The main aim of this work is to check the bio fouling in cooling tower and its effect on power generation. The way to reduce bio fouling is necessary issue within the thermal power station, as it results in reduction of the heat transfer rate and ultimately reduction in the power generation rate of plant. So as to attenuate the energy consumption in process plant equipped with device network. In various branches of chemical industries fouling builds up on heat transfer surfaces is a heat transfer equipment burning extra fuel to compensate for a reduced heat recovery accepting reduction of plant output due to periodic equipment cleaning and recovering the cost of cleaning interventions. Microbiological fouling can cause energy losses and loss of tower efficiency. The pilot plant is very useful in the thermal power plant to test the cooling water and then it is used in the thermal power plant to reduce the losses due to the bio fouling. In large power plant they having pilot plant with PLC system and microprocessor with highly accurate sensors. It will give very accurate and direct digital readings on screen

Mini-Channel Liquid Cooling System for Improving Heat Transfer Capacity and Thermal Uniformity in Battery Packs for Electric Vehicles

2021 ◽  
Vol 18 (3) ◽  
Author(s):  
Congbo Li ◽  
Yongsheng Li ◽  
Sanjay Srinivaas ◽  
Jinwen Zhang ◽  
Shiyang Qu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Dissipation ◽  
Cooling Water ◽  
Channel Structure ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Liquid Cooling ◽  
Temperature Deviation ◽  
Battery Packs ◽  
Heat Transfer Capacity

Abstract Temperature is a significant factor affecting performance and safety of energy storage systems such as battery packs. How to design a reliable battery thermal management system (BTMS) is still a hot issue at present. Most of the past researches have focused on methods of reducing temperature rise. This paper mainly studies how to reduce the temperature deviation of the battery pack while ensuring heat dissipation conditions. This paper designs a mini-channel liquid cooling BTMS with a side cover to improve heat transfer capacity and thermal uniformity in battery packs. By analyzing different side cover materials, cooling water temperature, and water channel structure, the influence of different parameters on battery heat dissipation and uniformity is obtained. The main findings are: (1) the presence of the side cover can effectively reduce the maximum temperature and temperature deviation, and the material with high thermal conductivity is more likely to dissipate heat, (2) The increase of cooling water inlet temperature can improve temperature uniformity, and (3) When the cross-sectional area is fixed, as the channel depth increases, the temperature deviation gradually decreases.

The Simulation Analysis on the Heat Transfer Model of Bloom

2013 ◽  
Vol 753-755 ◽  
pp. 872-875
Author(s):  
Ying Ying Zhai ◽  
Ying Li ◽  
Chen Yan ◽  
Yu Shi Ding
Keyword(s):  
Heat Transfer ◽  
Casting Speed ◽  
Simulation Analysis ◽  
Shell Growth ◽  
Cooling Water ◽  
Solidification Process ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Cooling Zone ◽  
Secondary Cooling

A mathematical heat transfer model was built to simulate temperature, shell growth and phase transformations in continuous casting based on the technical conditions of the bloom caster of some steelmaking plant. The simulation result is coincided with the measurement. The effects of the operation parameters including casting speed, bloom size and steel melt superheat on the solidification process were discussed and the means of enhancing the bloom temperature was brought forward. The research results have been applied in the practical manufacture process to compute the best casting speed, to control the flow rate of secondary cooling water and to optimize the spray pattern of secondary cooling zone. The bloom quality and productivity could be improved.

Optimization of Secondary Cooling on Rectangular Bloom Based on Subproblem Approximation Method

2012 ◽  
Vol 581-582 ◽  
pp. 932-935
Author(s):  
Wei Chen ◽  
Yong Ping Feng ◽  
Na Zheng ◽  
Ying Chen
Keyword(s):  
Heat Transfer ◽  
Water Consumption ◽  
Approximation Method ◽  
Cooling Water ◽  
Mathematics Model ◽  
Secondary Cooling ◽  
Internal Defects ◽  
Temperature Measuring ◽  
Central Pipe

For understanding the surface and internal defects of Q195 steel of 150mm×220mm rectangular bloom, a solidification heat transfer mathematics model based on temperature measuring is established. Meanwhile, the secondary cooling water is optimized according to the metallurgical criteria by means of subproblem approximation method. The results showed that: after the optimizing result is applied in actual production, the water consumption is reduced 8.2~11.5%, the quality of bloom improved obviously, and the defects such as central pipe, center porosity and internal cracks are reduced respectively.

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