Considerations On Hydraulic Models To Be Employed To Study Recirculation Intake Conditions Of Cooling Water In Steam Power Stations

Salah satu pembangkit listrik di Indonesia adalah pembangkit listrik Asam Asam yang terletak di dekat mulut tambang batubara. Setiap pembangkit listrik membutuhkan sejumlah besar air sebagai fluida kerja atau sebagai air pendingin. Pembangkit Listrik Tenaga Uap Asam Asam Batubara menggunakan air sungai sebagai air pendingin dengan mesin pendingin sebagai mesinnya. Pada bulan September 2017, menara pendingin unit 2B dari PLTU Asam Asam Batubara mengalami kegagalan operasi karena spacer rusak dan membuat PLTU Asam Asam Batubara mengalami penurunan dan kerugian lainnya. Tim teknik mendiagnosis kasus tersebut karena ketidakselarasan. Berdasarkan uraian akar penyebab masalah, ada tiga masalah utama yang mungkin terjadi yaitu: misalignment, unbalance, dan rotasi gearbox berat. Misalignment adalah pemicu utama untuk serangkaian masalah yang menyebabkan kegagalan operasi menara pendingin. Maka perlu mempelajari masalah utama yang menyebabkan kegagalan operasi menara pendingin untuk ditindaklanjuti dengan pemeliharaan preventif sesuai dengan kondisi saat ini untuk mencegah kegagalan yang serupa di unit 2B dan unit serupa lainnya. One of the power plants in Indonesia is the Asam Asam power plant located near the mouth of the coal mine. Each power plant requires large amounts of water as a working fluid or as a cooling water. Asam Asam Coal Fired Steam Power Plant uses river water as a cooling water with the cooling towers as its engine. In September 2017, the cooling tower unit 2B of Asam Asam Coal Fired Steam Power Plant experienced an operation failure because of the spacer was broken and made the Asam Asam Coal Fired Steam Power Plant to experience derating and other losses. The engineering team diagnoses the case due to misalignment. Based on the description of the root causes of the problem, there are three main problems that might occur namely : misalignment, unbalance, and heavy gearbox rotation. Misalignment is the main trigger for a series of problems causing failure of cooling tower operations. Then it is necessary to study the main problems causing the failure of the cooling tower operation to be followed up with preventive maintenance in accordance with the current conditions to prevent similar failures in unit 2B and other similar units.

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Seaweed ingress of cooling water intakes with predictions for Torness power station

Journal of Ocean Engineering and Marine Energy ◽

10.1007/s40722-021-00215-w ◽

2021 ◽

Author(s):

Nikolaos Spanakis ◽

Peter K. Stansby ◽

Benedict D. Rogers ◽

Pietro Bernardara

Keyword(s):

Nuclear Power ◽

Narrow Range ◽

Cooling Water ◽

Power Station ◽

Threshold Velocity ◽

Power Stations ◽

Sea Bed ◽

Local Measurements ◽

Induced Currents ◽

Wave Induced

AbstractSeaweed ingress into the cooling water intakes of nuclear power stations has caused several disruptions to electricity supply. Seaweed is transported by tidal and wave-induced currents after dislodgement from the sea bed following stormy conditions but ingress will be shown to be not only determined by wave conditions. An integrated model system has been developed to predict such ingress and applied at the Torness power station in Scotland where the mass of seaweed recovered was measured for some ingress cases. Prior to each case, seaweed is assumed initially to be distributed in areas surveyed within the surrounding coastal domain with a mass per unit area based on local measurements. Criteria for dislodgement are based on near-bed velocity. Six cases where the mass of ingress was measured and two cases with no ingress have been modelled and predicted by adjusting a dislodgement factor (a multiplier on the threshold velocity) within a relatively narrow range.

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IMPROVING THE EFFICIENCY OF SYSTEMS OF LOW-POTENTIAL COMPLEX POWER STATIONS BY OPTIMAL CONTROL OF CONSUMPTION CIRCULATION WATER

Electromechanical and energy saving systems ◽

10.30929/2072-2052.2020.4.52.34-39 ◽

2020 ◽

Vol 4 (52) ◽

pp. 34-39

Author(s):

G. Kanyuk ◽

◽

А. Mezerya ◽

A. Chebotarev ◽

A. Bliznichenko

Keyword(s):

Mathematical Modeling ◽

Cooling Water ◽

Field Performance ◽

Circulation Pump ◽

Theoretical Position ◽

Power Stations ◽

Complex Power ◽

Model Of Management ◽

Comparative Feature ◽

Potential Complex

Purpose. In article is organized analysis of the influence state of working circulation pump on economy of the systems low-potential complex and on the general economy of the work heat and atomic power stations. The organized analysis of the field-performance data of the systems low-potential complex Zaporozhskoy NPS in cut of the year, which has shown that as criterion to economy of the work low-potential complex can be accepted importance of the increase the production to powers of the compartment of steam turbine to power stations. Methodology. On the grounds of mathematical modeling main dependencies, which characterize efficiency of the functioning the systems low-potential complex. Results. The certain reserve energysave at increasing of efficiency of the functioning the systems low-potential complex. So total value of the losses to disposable energy in low-potential complex for energyblock HPS power 300–1200 MWt forms 7–8 % for systems of the water-supply with water-chiller and evaporation and 8–10 % for systems with radiator are determined. The organized analysis of the experimental features energyblock 300 MWt Zmievskoy HPS and is determined dependency of the pressure pair is in capacitor from the temperature circulation water and consumption pair under fixed consumption circulation water. Analytical dependencies, which allow coming from the known importance of the consumption pair, the temperature circulation water and desired pressure in capacitor to define the necessary consumption cooling water, under which will are provided given parameters are brought. Practical value. Comparative feature to energy efficiency of the functioning the system turbine-capacitor coming from features gain powers of the turbine for concrete consumption pair and dependencies of the consumption circulation water from consumed powers circulation pump will built. The broughted model of management system low-potential complex on criterion of the optimum of the consumption circulation water, under which total losses to energy will be minimum. On the grounds of afore-cited theoretical position

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IGCC for Brown Coals With Supercritical Steam Turbine

Volume 7: Turbo Expo 2004 ◽

10.1115/gt2004-54244 ◽

2004 ◽

Author(s):

M. Stastny ◽

J. Kucera ◽

Z. Hrdina ◽

D. Hanus

Keyword(s):

Steam Turbine ◽

Brown Coal ◽

Thermal Efficiency ◽

Gas Turbines ◽

Steam Power ◽

Supercritical Steam Parameters ◽

Power Stations ◽

Brown Coals ◽

Steam Parameters ◽

Reduction Of Co2

The paper deals with the IGCC for brown coal (BC) with simultaneous improvement of the steam cycle by the usage of supercritical steam parameters. Two gasifiers with a fluidized bed are used with outlet syngas temperature about 900°C. Main part of the paper is focused on the arrangement and optimization of the IGCC with net total electrical output 454.7 MW and with supercritical inlet parameters 260 bar, 580°C/600°C of steam turbine. The energy sources for the steam part of the cycle are HRSGs downstream of two gas turbines at 122.6 MW each and two raw gas coolers downstream of two gasifiers. The thermal efficiency of this IGCC is on LHV basis about 49.0%. Utilization of brown coal (BC) energy in described IGCC is by 4.7% higher than in steam power station with the same parameters. This IGCC enables reduction of CO2 emission by around 44% compared with existing power stations with thermal efficiency 34%.

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Field Observation of Tide-Induced Loading Upon Undersea Tunnel

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics ◽

10.1115/omae2012-84253 ◽

2012 ◽

Author(s):

Nan Chen ◽

Guan-lin Ye ◽

Jin-jian Chen ◽

Xiao-he Xia

Keyword(s):

Linear Relation ◽

Nuclear Power ◽

Cooling Water ◽

Earth Pressure ◽

Tidal Height ◽

Tidal Level ◽

Pressure Transducers ◽

Power Stations ◽

Earth Pressures ◽

Type Pressure

Many shallow undersea tunnels have been built to circulate the cooling water for the thermal or nuclear power stations in recent years. In current study, a field monitoring of tide-influenced earth pressure on the tunnel was carried out by using the pad type pressure transducers. The variation of tidal level was also recorded carefully. The measured results of earth pressures and the tidal height were analyzed qualitatively and quantitatively. It can be found that there is a linear relation between the variation of load and tidal height. The computed values of the loadings based on tunnel pressure theory are almost the same with measurements.

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