On low-grade waste heat utilization from a supercritical steam power plant using an ORC-bottoming cycle coupled with two sources of heat

2017 ◽  
Vol 146 ◽  
pp. 158-173 ◽  
Author(s):  
Paweł Ziółkowski ◽  
Tomasz Kowalczyk ◽  
Sebastian Kornet ◽  
Janusz Badur
2021 ◽  
Vol 10 (1) ◽  
pp. 123-130
Author(s):  
Clarence Daffa Ananta ◽  
Ria Azizah Tri Nuraini ◽  
Ibnu Pratikto

Salah satu pemanfaatan lingkungan pesisir dan laut adalah pembangunan Pembangkit Listrik Tenaga Uap (PLTU), karena sistem penyediaan air yang dibutuhkan untuk operasional PLTU berasal dari air laut. Kenaikan suhu permukaan laut akibat adanya aktivitas PLTU akan mempengaruhi organisme pada perairan tersebut, salah satunya adalah fitoplankton. Fitoplankton merupakan organisme autotroph yang mengandung pigmen klorofil sehingga dapat melakukan proses fotosintesis dengan memanfaatkan cahaya matahari. Tujuan penelitian ini adalah untuk mengkaji komposisi dan kelimpahan fitoplankton di perairan sekitar PLTU Tambak Lorok Semarang. Metode yang digunakan dalam penelitian ini adalah metode deskriptif eksploratif, sedangkan dalam pengambilan sampel penelitian, digunakan metode purposive sampling. Hasil kelimpahan fitoplankton secara keseluruhan di Perairan Tambak Lorok, yang tertinggi terdapat pada stasiun 3 dengan jumlah sebesar 4035,7 Ind/L sedangkan pada stasiun 2 dengan jumlah sebesar 2812,7 Ind/L dan kelimpahan terendah terdapat pada stasiun 1 dengan jumlah sebesar 1494,7 Ind/L. Terjadi kenaikan suhu sebesar 5OC dengan nilai suhu mencapai 36,2OC pada stasiun 1 yang memiliki jarak 300 m dari titik outfall, suhu kemudian mengalami penurunan sebesar 3 OC dengan nilai suhu sebesar 33,7OC pada stasiun 2, dan terjadi penurunan pada stasiun 3 hingga nilai suhu sebesar 32,8OC dimana suhu sudah mendekati nilai normal suhu perairan sebesar 31 OC. Dapat disimpulkan bahwa nilai kelimpahan fitoplankton mengalami penurunan seiring dengan meningkatnya kenaikan suhu permukaan laut pada Perairan Tambak Lorok Semarang.One of the utilization of coastal and ocean environment is the development of electric steam power plant since the water required for the operational comes from seawater. The disposal location of the used seawater is in the form of waste heat, streamed into the ocean; therefore it caused the rise of sea-level temperature. The rising sea level temperature will affect the organism on those waters; one of them is phytoplankton. Phytoplankton is an autotroph organism that contains chlorophyll pigment so it can do photosynthesis process using the sunlight. This research aims to study the abundance of phytoplankton in waters around electric steam power plant Tambak Lorok Semarang. The method used in this research is the explorative, descriptive method, while the sampling method is purposive sampling. The highest phytoplankton abudance in Tambak Lorok Waters is located on the third station with 4035,7 Ind/L, while on the second station is 2812,7 Ind/L and the lowest abundance is on the first station with only 1494,7 Ind/L. The increase of sea-level temperature is up to 5OC with the temperature value reached 36,2OC on the first station that located 300 m from the power plant outfall. The temperature then drops 3OC with the value of 33,7OC on the second station. The temperature then drops on the third station with the value of 32,8OC where it’s closed to average sea level temperature, which is 31OC. It can be concluded that the abundance of phytoplankton decreased along with the increase of sea level temperature in Tambak Lorok Waters.


Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2634 ◽  
Author(s):  
Daniel T. Mohler ◽  
Michael H. Wilson ◽  
Zhen Fan ◽  
John G. Groppo ◽  
Mark Crocker

Microalgae are a potential means of recycling CO2 from industrial point sources. With this in mind, a novel photobioreactor (PBR) was designed and deployed at a coal-fired power plant. To ascertain the feasibility of using waste heat from the power plant to heat algae cultures during cold periods, two heat transfer models were constructed to quantify PBR cooling times. The first, which was based on tabulated data, material properties and the physical orientation of the PBR tubes, yielded a range of heat transfer coefficients of 19–64 W m−2 K−1 for the PBR at wind speeds of 1–10 m s−1. The second model was based on data collected from the PBR and gave an overall heat transfer coefficient of 24.8 W m−2 K−1. Energy penalties associated with waste heat utilization were found to incur an 18%–103% increase in energy consumption, resulting in a 22%–70% reduction in CO2 capture for the scenarios considered. A techno-economic analysis showed that the cost of heat integration equipment increased capital expenditures (CAPEX) by a factor of nine and increased biomass production costs by a factor of three. Although the scenario is thermodynamically feasible, the increase in CAPEX incurs an increase in biomass production cost that is economically untenable.


2010 ◽  
Vol 31 (4) ◽  
pp. 111-123 ◽  
Author(s):  
Aleksandra Borsukiewicz-Gozdur

Influence of heat recuperation in ORC power plant on efficiency of waste heat utilization The present work is devoted to the problem of utilization of the waste heat contained in the exhaust gases having the temperature of 350 °C. Conversion of the waste heat into electricity using a power plant working with organic fluid cycles is considered. Three Organic Rankine Cycle (ORC) power plant solutions are analysed and compared: a solution with the basic, single thermodynamic conversion cycle, one with internal heat recuperation and one with external heat recuperation. It results from the analysis that it is the proper choice of the working fluid evaporation temperature that fundamentally affects the maximum of the ORC plant output power. Application of the internal heat recuperation in the plant basic cycle results in the output power increase of approx. 5%. Addition of the external heat recuperation to the plant basic cycle, in the form of a secondary supercritical ORC power cycle can rise the output power by approx. 2%.


1977 ◽  
Author(s):  
J.H. Ryther ◽  
R.E. Huke ◽  
J.C. Archer ◽  
D.R. Price ◽  
W.J. Jewell ◽  
...  

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