Evaluation of Clogged Hydropower Plant Trash Rack Losses

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HRIBERNIK, Aleš .
Evaluation of Clogged Hydropower Plant Trash Rack Losses. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 66, n.2, p. 142-152, february 2020. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/>. Date accessed: 24 sep. 2020. 
doi:http://dx.doi.org/10.5545/sv-jme.2019.6313.
Hribernik, A.
(2020).
Evaluation of Clogged Hydropower Plant Trash Rack Losses.
Strojniški vestnik - Journal of Mechanical Engineering, 66(2), 142-152.
doi:http://dx.doi.org/10.5545/sv-jme.2019.6313
@article{sv-jmesv-jme.2019.6313,
	author = {Aleš  Hribernik},
	title = {Evaluation of Clogged Hydropower Plant Trash Rack Losses},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {2},
	year = {2020},
	keywords = {hydropower plant; trash rack; debris; head losses},
	abstract = {A trash rack is applied in front of the turbine to restrict the entrance of significantly sized material present in the water. It obstructs the free flow, and produces energy-losses by generating eddies induced partially by the trash rack bars and partially by the debris collected on it. While the additional static forces due to debris accumulation are considered in the trash rack design process, the debris caused energy losses taking place during plant operation are usually neglected, although a rather simple model was developed to account for them. However, the long term application of this model demands an extensive set of trash rack clogging data and, therefore, no such application has been documented so far. Thus, an analysis was performed to acquire the debris accumulation intensity with time and to evaluate the extra energy losses they caused. Data on one year operation of a hydropower plant aggregate i.e. flow rate and trash rack head losses measured at 15 minute intervals, were acquired and used to build a rack clogging model. Using this model, it was possible to distinguish clearly between debris and rack structure caused head losses, and to analyse different cleaning strategies. It was shown that cumulative debris contributed to almost one half of head losses although the rack was cleaned frequently. This shows clearly that debris caused head losses may not be neglected, moreover, debris removal has to be planned carefully and carried out efficiently. Analyses of acquired data confirmed that incomplete debris removal increased head losses by 18 %, and proved how important regular and thorough rake cleaning is. Moreover, it was found out that the actually applied periodical rake cleaning was not optimal, and that the circumstances required cleaning strategy performed much better. It resulted in similar head losses, while the number of rack cleanings was reduced by 60 %.},
	issn = {0039-2480},	pages = {142-152},	doi = {10.5545/sv-jme.2019.6313},
	url = {https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/}
}
Hribernik, A.
2020 February 66. Evaluation of Clogged Hydropower Plant Trash Rack Losses. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 66:2
%A Hribernik, Aleš 
%D 2020
%T Evaluation of Clogged Hydropower Plant Trash Rack Losses
%B 2020
%9 hydropower plant; trash rack; debris; head losses
%! Evaluation of Clogged Hydropower Plant Trash Rack Losses
%K hydropower plant; trash rack; debris; head losses
%X A trash rack is applied in front of the turbine to restrict the entrance of significantly sized material present in the water. It obstructs the free flow, and produces energy-losses by generating eddies induced partially by the trash rack bars and partially by the debris collected on it. While the additional static forces due to debris accumulation are considered in the trash rack design process, the debris caused energy losses taking place during plant operation are usually neglected, although a rather simple model was developed to account for them. However, the long term application of this model demands an extensive set of trash rack clogging data and, therefore, no such application has been documented so far. Thus, an analysis was performed to acquire the debris accumulation intensity with time and to evaluate the extra energy losses they caused. Data on one year operation of a hydropower plant aggregate i.e. flow rate and trash rack head losses measured at 15 minute intervals, were acquired and used to build a rack clogging model. Using this model, it was possible to distinguish clearly between debris and rack structure caused head losses, and to analyse different cleaning strategies. It was shown that cumulative debris contributed to almost one half of head losses although the rack was cleaned frequently. This shows clearly that debris caused head losses may not be neglected, moreover, debris removal has to be planned carefully and carried out efficiently. Analyses of acquired data confirmed that incomplete debris removal increased head losses by 18 %, and proved how important regular and thorough rake cleaning is. Moreover, it was found out that the actually applied periodical rake cleaning was not optimal, and that the circumstances required cleaning strategy performed much better. It resulted in similar head losses, while the number of rack cleanings was reduced by 60 %.
%U https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/
%0 Journal Article
%R 10.5545/sv-jme.2019.6313
%& 142
%P 11
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 66
%N 2
%@ 0039-2480
%8 2020-02-13
%7 2020-02-13
Hribernik, Aleš.
"Evaluation of Clogged Hydropower Plant Trash Rack Losses." Strojniški vestnik - Journal of Mechanical Engineering [Online], 66.2 (2020): 142-152. Web.  24 Sep. 2020
TY  - JOUR
AU  - Hribernik, Aleš 
PY  - 2020
TI  - Evaluation of Clogged Hydropower Plant Trash Rack Losses
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6313
KW  - hydropower plant; trash rack; debris; head losses
N2  - A trash rack is applied in front of the turbine to restrict the entrance of significantly sized material present in the water. It obstructs the free flow, and produces energy-losses by generating eddies induced partially by the trash rack bars and partially by the debris collected on it. While the additional static forces due to debris accumulation are considered in the trash rack design process, the debris caused energy losses taking place during plant operation are usually neglected, although a rather simple model was developed to account for them. However, the long term application of this model demands an extensive set of trash rack clogging data and, therefore, no such application has been documented so far. Thus, an analysis was performed to acquire the debris accumulation intensity with time and to evaluate the extra energy losses they caused. Data on one year operation of a hydropower plant aggregate i.e. flow rate and trash rack head losses measured at 15 minute intervals, were acquired and used to build a rack clogging model. Using this model, it was possible to distinguish clearly between debris and rack structure caused head losses, and to analyse different cleaning strategies. It was shown that cumulative debris contributed to almost one half of head losses although the rack was cleaned frequently. This shows clearly that debris caused head losses may not be neglected, moreover, debris removal has to be planned carefully and carried out efficiently. Analyses of acquired data confirmed that incomplete debris removal increased head losses by 18 %, and proved how important regular and thorough rake cleaning is. Moreover, it was found out that the actually applied periodical rake cleaning was not optimal, and that the circumstances required cleaning strategy performed much better. It resulted in similar head losses, while the number of rack cleanings was reduced by 60 %.
UR  - https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/
@article{{sv-jme}{sv-jme.2019.6313},
	author = {Hribernik, A.},
	title = {Evaluation of Clogged Hydropower Plant Trash Rack Losses},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {2},
	year = {2020},
	doi = {10.5545/sv-jme.2019.6313},
	url = {https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/}
}
TY  - JOUR
AU  - Hribernik, Aleš 
PY  - 2020/02/13
TI  - Evaluation of Clogged Hydropower Plant Trash Rack Losses
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 66, No 2 (2020): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6313
KW  - hydropower plant, trash rack, debris, head losses
N2  - A trash rack is applied in front of the turbine to restrict the entrance of significantly sized material present in the water. It obstructs the free flow, and produces energy-losses by generating eddies induced partially by the trash rack bars and partially by the debris collected on it. While the additional static forces due to debris accumulation are considered in the trash rack design process, the debris caused energy losses taking place during plant operation are usually neglected, although a rather simple model was developed to account for them. However, the long term application of this model demands an extensive set of trash rack clogging data and, therefore, no such application has been documented so far. Thus, an analysis was performed to acquire the debris accumulation intensity with time and to evaluate the extra energy losses they caused. Data on one year operation of a hydropower plant aggregate i.e. flow rate and trash rack head losses measured at 15 minute intervals, were acquired and used to build a rack clogging model. Using this model, it was possible to distinguish clearly between debris and rack structure caused head losses, and to analyse different cleaning strategies. It was shown that cumulative debris contributed to almost one half of head losses although the rack was cleaned frequently. This shows clearly that debris caused head losses may not be neglected, moreover, debris removal has to be planned carefully and carried out efficiently. Analyses of acquired data confirmed that incomplete debris removal increased head losses by 18 %, and proved how important regular and thorough rake cleaning is. Moreover, it was found out that the actually applied periodical rake cleaning was not optimal, and that the circumstances required cleaning strategy performed much better. It resulted in similar head losses, while the number of rack cleanings was reduced by 60 %.
UR  - https://www.sv-jme.eu/article/evaluation-of-clogged-hydropower-plant-trash-rack-losses/
Hribernik, Aleš"Evaluation of Clogged Hydropower Plant Trash Rack Losses" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 66 Number 2 (13 February 2020)

Authors

Affiliations

  • University of Maribor, Faculty of Mechanical Engineering, Slovenia 1

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 66(2020)2, 142-152

https://doi.org/10.5545/sv-jme.2019.6313

A trash rack is applied in front of the turbine to restrict the entrance of significantly sized material present in the water. It obstructs the free flow, and produces energy-losses by generating eddies induced partially by the trash rack bars and partially by the debris collected on it. While the additional static forces due to debris accumulation are considered in the trash rack design process, the debris caused energy losses taking place during plant operation are usually neglected, although a rather simple model was developed to account for them. However, the long term application of this model demands an extensive set of trash rack clogging data and, therefore, no such application has been documented so far. Thus, an analysis was performed to acquire the debris accumulation intensity with time and to evaluate the extra energy losses they caused. Data on one year operation of a hydropower plant aggregate i.e. flow rate and trash rack head losses measured at 15 minute intervals, were acquired and used to build a rack clogging model. Using this model, it was possible to distinguish clearly between debris and rack structure caused head losses, and to analyse different cleaning strategies. It was shown that cumulative debris contributed to almost one half of head losses although the rack was cleaned frequently. This shows clearly that debris caused head losses may not be neglected, moreover, debris removal has to be planned carefully and carried out efficiently. Analyses of acquired data confirmed that incomplete debris removal increased head losses by 18 %, and proved how important regular and thorough rake cleaning is. Moreover, it was found out that the actually applied periodical rake cleaning was not optimal, and that the circumstances required cleaning strategy performed much better. It resulted in similar head losses, while the number of rack cleanings was reduced by 60 %.

hydropower plant; trash rack; debris; head losses