Muhammad Helios | King Mongkut's University of Technology Thonburi (original) (raw)
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Papers by Muhammad Helios
In this paper, the energy and exergy analysis selecting data from three coal fired-thermal power ... more In this paper, the energy and exergy analysis selecting data from three coal fired-thermal power plants, two in Turkey and one in Jordan, are conveyed. The main purposes in this paper are to know where the largest energy and exergy losses occurred, as well as to describe the improvement of energy and exergy quantity in each of components. Although the heat supplied to the boiler (or energy from fuel) in Can-PP was less than that in Ca-PP, the net power generated was higher which led to the higher thermal efficiency. This is likely due to the better and newer steam cycle technology used for Can-PP. The pressure of main steam operated at Can-PP was 172 bar, which was almost 40 bar higher than that operated in Ca-PP. The flue gas temperature in the former Can-PP is also lower than Ca-PP. In both plants, the energy losses at the condenser were the highest among major units of the power plants, accounting for about 50 % of the total heat supply to the boilers. In addition, the reference environment temperature was also found to have effects on the value of exergy efficiency and exergy destruction. Each 10C increase of the reference temperature, the efficiency of the boiler and turbine decrease by 1.5% and 0.65%, respectively, whereas the exergy destruction of boiler and turbine increase about 3.2 % and 0.66 %, respectively.
The effects of reference environment temperatures on the performance of two coal-fired power plan... more The effects of reference environment temperatures on the performance of two coal-fired power plants in Thailand (A-PP) and Indonesia (B-PP) was investigated and are presented in this paper. The results showed that the overall energy and exergy efficiency of A-PP were lower than B-PP at actual environment temperature, i.e. 39.45 % and 33.63 %, respectively, for A-PP, and 41.91 % and 37.48 %, respectively, for B-PP. With an assumption used in this study that the cooling water temperature in condenser is constant, the higher exergy efficiency (either overall or of each plant component) was achieved at lower reference environment temperature. It was also noticed that, when the environment temperatures were too high, i.e. above about 307.15 K, the resulting exergy efficiency of condenser was below 0%, which implies the impossibility of operation. However, the trend of exergy efficiency of condenser at the reference environment temperature above 316.15 K appeared to reverse, which may be explained by the increase of generated exergy and decrease of exergy destruction at a very high reference temperature.
This study conducted the energy and exergy analysis based on data taken from the two selected coa... more This study conducted the energy and exergy analysis based on data taken from the two selected coal fired-thermal power plants (TPPs): one in Thailand (A-PP) and the other in Indonesia (B-PP). Both power plants are of similar characteristics that are lignite fired (superheated) steam power plant and approximately 300 MW gross power output. The aims of this case study are to illustrate the distribution of energy and exergy of each part in coal-fired power plants for energy improvement, to compare the value of energy and exergy performance of each component in both of plants, and to identify the effect of various loads on energy and exergy value. According to the first and second law of thermodynamics, even though the rate of energy input in form of chemical energy in coal to the boiler in Power Plant B was slightly lower than that in Power Plant A, the net power generated and thermal efficiency of B-PP were higher. This is due to the higher heating value of fuel supplied, and the better and newer steam cycle technology used for Power Plant B. The energy losses at condenser were identified as the highest among major units of the power plants, of which percentage of rejected heat at 100% operation load reached 49.42% and 49.31% for A-PP and B-PP, respectively. The energy efficiencies of A-PP and B-PP at 100% load were 39.45% and 41.91%, respectively, whereas the exergy efficiencies were 35.20% and 38.20%, respectively. Low exergy efficiency in A-PP was identified at boiler, LPH 1, LPH 2, CEP and condenser, whereas low exergy efficiency in B-PP was identified at boiler, condenser, CEP and LPH 1. Decreasing operating load resulted in the decrease of both energy and exergy efficiency of A-PP, but no change was found for B-PP. The uncontrollable variation of operating parameters such as fuel properties, steam condition, etc, among different operation loads in B-PP seem to have stronger effects on the efficiency than the operation load.
In this paper, the energy and exergy analysis selecting data from three coal fired-thermal power ... more In this paper, the energy and exergy analysis selecting data from three coal fired-thermal power plants, two in Turkey and one in Jordan, are conveyed. The main purposes in this paper are to know where the largest energy and exergy losses occurred, as well as to describe the improvement of energy and exergy quantity in each of components. Although the heat supplied to the boiler (or energy from fuel) in Can-PP was less than that in Ca-PP, the net power generated was higher which led to the higher thermal efficiency. This is likely due to the better and newer steam cycle technology used for Can-PP. The pressure of main steam operated at Can-PP was 172 bar, which was almost 40 bar higher than that operated in Ca-PP. The flue gas temperature in the former Can-PP is also lower than Ca-PP. In both plants, the energy losses at the condenser were the highest among major units of the power plants, accounting for about 50 % of the total heat supply to the boilers. In addition, the reference environment temperature was also found to have effects on the value of exergy efficiency and exergy destruction. Each 10C increase of the reference temperature, the efficiency of the boiler and turbine decrease by 1.5% and 0.65%, respectively, whereas the exergy destruction of boiler and turbine increase about 3.2 % and 0.66 %, respectively.
The effects of reference environment temperatures on the performance of two coal-fired power plan... more The effects of reference environment temperatures on the performance of two coal-fired power plants in Thailand (A-PP) and Indonesia (B-PP) was investigated and are presented in this paper. The results showed that the overall energy and exergy efficiency of A-PP were lower than B-PP at actual environment temperature, i.e. 39.45 % and 33.63 %, respectively, for A-PP, and 41.91 % and 37.48 %, respectively, for B-PP. With an assumption used in this study that the cooling water temperature in condenser is constant, the higher exergy efficiency (either overall or of each plant component) was achieved at lower reference environment temperature. It was also noticed that, when the environment temperatures were too high, i.e. above about 307.15 K, the resulting exergy efficiency of condenser was below 0%, which implies the impossibility of operation. However, the trend of exergy efficiency of condenser at the reference environment temperature above 316.15 K appeared to reverse, which may be explained by the increase of generated exergy and decrease of exergy destruction at a very high reference temperature.
This study conducted the energy and exergy analysis based on data taken from the two selected coa... more This study conducted the energy and exergy analysis based on data taken from the two selected coal fired-thermal power plants (TPPs): one in Thailand (A-PP) and the other in Indonesia (B-PP). Both power plants are of similar characteristics that are lignite fired (superheated) steam power plant and approximately 300 MW gross power output. The aims of this case study are to illustrate the distribution of energy and exergy of each part in coal-fired power plants for energy improvement, to compare the value of energy and exergy performance of each component in both of plants, and to identify the effect of various loads on energy and exergy value. According to the first and second law of thermodynamics, even though the rate of energy input in form of chemical energy in coal to the boiler in Power Plant B was slightly lower than that in Power Plant A, the net power generated and thermal efficiency of B-PP were higher. This is due to the higher heating value of fuel supplied, and the better and newer steam cycle technology used for Power Plant B. The energy losses at condenser were identified as the highest among major units of the power plants, of which percentage of rejected heat at 100% operation load reached 49.42% and 49.31% for A-PP and B-PP, respectively. The energy efficiencies of A-PP and B-PP at 100% load were 39.45% and 41.91%, respectively, whereas the exergy efficiencies were 35.20% and 38.20%, respectively. Low exergy efficiency in A-PP was identified at boiler, LPH 1, LPH 2, CEP and condenser, whereas low exergy efficiency in B-PP was identified at boiler, condenser, CEP and LPH 1. Decreasing operating load resulted in the decrease of both energy and exergy efficiency of A-PP, but no change was found for B-PP. The uncontrollable variation of operating parameters such as fuel properties, steam condition, etc, among different operation loads in B-PP seem to have stronger effects on the efficiency than the operation load.