Experimental Research on Pressure Drop to Optimize Twisted Strips with Holes in Tubes of Condensers

2011 ◽  
Vol 347-353 ◽  
pp. 448-452
Author(s):  
De Qi Peng ◽  
Ya Jie Zhou ◽  
Wei Qiang Wang ◽  
Tian Lan Yu ◽  
Huan Yu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Pressure Drop ◽  
Flow Velocity ◽  
Experimental Research ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
High Flow ◽  
Low Flow ◽  
High Flow Velocity

In order to reduce the pressure drop increase caused by self-rotating plastic twisted-strips in heat transfer tubes of vacuum condensers in thermal power plant, the twisted strips structure is optimized. There are holes distributed in twisted strip uniformly. The holes diameter and interval are optimized through experimental research. The results show that when holes diameter is less than 6mm, holes can reduce the pressure drop increase at low flow velocity while the pressure drop with holes is greater than that without holes at high flow velocity. The holes diameter is 4~5mm when the pressure drop is the lowest. The pressure drop with holes is always larger than that without holes when holes diameter is more than 6mm. The pressure drop will increase as holes interval decreases at high flow velocity, while it will reduce at low flow velocity.

scholarly journals PERFORMANCE ENHANCEMENT FOR ROTARY AIR PREHEATER OF A THERMAL POWER PLANT

2020 ◽  
Vol 24 (06) ◽  
pp. 57-67
Author(s):  
Sinan Mazin Hazim ◽  
◽  
Mohammed H. Alhamdo ◽  
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Power Plant ◽  
Pressure Drop ◽  
Heat Transfer Rate ◽  
Thermal Power Plant ◽  
Transfer Rate ◽  
Thermal Power ◽  
Pumping Power ◽  
Air Preheater

The corrosion phenomenon is considered the main problems for air preheater in thermal power plant. The boiler flue gas contamination leads to decrease the air preheater performance and increases the maintenance cost, which causes the degradation of the cold end heating elements and thus leads to decrease the heat recovery rate. In this study, an experimental investigation was done for the transient thermal behavior and the pressure drop of the standard regenerative air preheater (Pmatrix) model, evaluating the performance factor, then modifying the air preheater (P+CG) model by changing the plates at the cold end last basket to the coarse gravel media. Since the gravel media have low thermal conductivity and predicted to give a high pressure drop, a new technique was done for the modified air preheater to compensate the low heat transfer rates and reduce the pressure drop in the gravel media by inserting bypass tubes at ratios (i and s), Which, the (i) model represents the inner aperture of tubes for the hot baskets facing to the inner aperture of tubes for the cold basket. While (s) model the insertion the tubes of the hot baskets as a staggered distribution with the tubes for the cold basket. The experimental investigation was carried out for the Reynolds number based on the test duct hydraulic diameter at a range of 24500<Re < 98000 for each charge and discharge periods. The experimental results are presented in terms of the average heat transfer rate and the pumping power for matrix models. The experimental measured results corroborated that the bypass tubes have a significant impact on improving the heat transfer rate and the pressure drop reduction of the modified air preheater matrix. The results showed that the best performance factor was achieved in the air preheater (P+CG+Ts) model which found to be in the range of 0.7-0.31 at high and low Reynolds. However, this improvement increased the pumping power by 13% than the (Pmatrix) model.

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

scholarly journals Determination of Thermal Pollution Effect on End Part of Stream

2020 ◽  
Vol 9 (3) ◽  
pp. 3311-3319
Keyword(s):  
Water Quality ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Low Flow ◽  
Thermal Plume ◽  
Pollutant Source ◽  
Set Up

The present study was conducted to evaluate the environmental impact of thermal effluent sources on the main water quality parameters at the low flow conditions. The low flow causes the flow velocity to be low which causes accumulation of any pollutant source. The study was performed by creating a 2-d model of the last reach of Rosetta branch at winter closure. Delft 3d software is used to create a hydro-dynamic model to simulate the flow pattern within a 5 km of the branch upstream Edfina regulator. Water quality model is coupled afterwards to simulate the water quality parameters. A base case scenario of the current state at the low flow condition is set up and calibrated. Another scenario is performed after adding a thermal pollutant source. Thermal power plant is used as an application of thermal pollutant source. Cooling water is with drawled from an intake and discharged back to the water source with a relatively higher temperature downstream the intake. A case study of Dairut thermal power plant which is planned to be constructed at this area is used. Hydrographic survey is performed to collect essential hydraulic data for the model. Field measurements are performed to collect water quality along the area. A numerical model was set up and the area was simulated. Results showed accumulation of thermal plume. The higher temperatures lowered the dissolved oxygen in the thermal plume area. On the other hand, BOD and NO3 values increased with different rates. Ammonium was positively affected and was lowered.

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