Feedwater Repowering of Coal Fired Power Plants: Effects of Steam Turbine Overloads on Energy and Economic Performance of the Integrated Power System

2013 ◽  
Author(s):  
Roberto Carapellucci ◽  
Lorena Giordano
Keyword(s):  
Power Plant ◽  
Steam Turbine ◽  
Power Plants ◽  
Unit Cost ◽  
Operating Mode ◽  
Environmental Benefits ◽  
Efficiency Gain ◽  
Co2 Emission Reduction ◽  
Steam Power ◽  
Steam Power Plant

In recent years, the environmental concerns and the need to improve the competitiveness of existing coal-fired power plants have renewed the interest for the repowering option. Repowering techniques based on combustion turbines allow to increase thermodynamic performances of the steam power plant, as well as to reduce emissions of greenhouse gases, due to efficiency improvement and partial fuel-shift from coal to natural gas. This paper aims to evaluate performances of feedwater repowering of a coal fired power plant, considering various steam turbine overloads. Two types of analysis are here proposed. First, thermodynamic and environmental benefits of feedwater repowering are evaluated in terms of efficiency gain and CO2 emission reduction, with reference to the steam power plant only. Then, effects of the integration of a gas turbine into the existing coal fired power plant are highlighted. Different feedwater repowering options, varying the operating mode of the coal fired power plant, are compared from the energy, economic and environmental point of view. The attention is focused on performance parameters of the integrated steam-gas power plant, as well as on marginal indices defining the efficiency and unit cost of electricity of the additional power production.

scholarly journals Gerakan Kontra Pembangunan Shelter 9 Dan 10 Pltu Suralaya Merak-Banten

ijd-demos ◽  
2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Nida Urrohmah ◽  
Karin Caroline Kelly ◽  
Fitri Yuliani
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Electrical Energy ◽  
Environmental Damage ◽  
Steam Power ◽  
Steam Power Plant ◽  
Steam Power Plants ◽  
Local Residents

Electric Steam Power Plants (PLTU) need coal as fuel to produce electricity. The higher the electrical energy needed to eat, the more fuel will be used. This has happened in the construction of shelters 9 and 10 Suralaya Merak-Banten steam power plant (PLTU). This development is reaping various kinds of rejection because it causes environmental damage not only in the area around the development operation but also in the Greater Jakarta area. The rejection movement was initiated by local residents and supported by international Environmental NGOs.Pembangkit Listrik Tenaga Uap (PLTU) membutuhkan batu bara sebagai bahan bakar untuk menghasilkan energi listrik. Semakin tinggi energi listrik yang dibutuhkan makan akan semakin banyak bahan bakar yang digunakan. Hal ini terjadi pada pembangunan shelter 9 dan 10 PLTU Suralaya di pulau Jawa spesifiknya di daerah Merak-Banten. Pembangunan ini menuai berbagai macam penolakan karena mengakibatkan kerusakan lingkungan tidak hanya pada wilayah sekitar operasi pembangunan namun juga pada wilayah Jabodetabek. Gerakan penolakan diinisiasi tentunya oleh warga setempat dan didukung dengan NGO Internasional penggiat isu lingkungan. 

Performance Analysis of a 565 MW Steam Power Plant

2011 ◽  
Author(s):  
R. Chacartegui ◽  
D. Sa´nchez ◽  
J. A. Becerra ◽  
A. Mun˜oz ◽  
T. Sa´nchez
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Operating Conditions ◽  
Feed Water ◽  
Water Heater ◽  
Turbine Generator ◽  
Steam Power ◽  
Steam Power Plant ◽  
Water Heaters ◽  
Steam Power Plants

In this work, a tool to predict the performance of fossil fuel steam power plants under variable operating conditions or under maintenance operations has been developed. This tool is based on the Spencer-Cotton-Cannon method for large steam turbine generator units. The tool has been validated by comparing the predicted results at different loads with real operating data of a 565 MW steam power plant, located in Southern Spain. The results obtained from the model show a good agreement with most of the power plant parameters. The simulation tool has been then used to predict the performance of a steam power plant in different operating conditions such as variable terminal temperature difference or drain cooler approach of the feed-water heaters, or under maintenance conditions like a feed-water heater out of service.

scholarly journals ANALISIS KEGAGALAN OPERASI COOLING TOWER FAN UNIT 2B PLTU ASAM ASAM

JTAM ROTARY ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 65
Author(s):  
Andhika Bayu Oktavianto ◽  
Mastiadi Tamjidillah
Keyword(s):  
Power Plant ◽  
Preventive Maintenance ◽  
Power Plants ◽  
Cooling Tower ◽  
Cooling Water ◽  
Working Fluid ◽  
Steam Power ◽  
Steam Power Plant ◽  
Plant Uses ◽  
Engineering Team

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.

Advanced Steam Turbine Technology for Unique Double Reheat Steam Power Plant Layout

2019 ◽  
Author(s):  
Benjamin Kloss-Grote ◽  
Michael Wechsung ◽  
Rainer Quinkertz ◽  
Henning Almstedt
Keyword(s):  
Power Plant ◽  
Steam Turbine ◽  
Elevated Temperatures ◽  
Technology Development ◽  
Major Change ◽  
Feed Water ◽  
Steam Power ◽  
Protection Measures ◽  
Steam Power Plant ◽  
Material Change

Abstract Environmental aspects have increased the pressure on the fossil power generation industry to reduce carbon dioxide (CO2) emissions. One way to achieve this is by increasing the overall plant efficiency, which also fosters an economical plant operation. How can the efficiency of a next generation coal fired ultra super critical (USC) steam power plant (SPP) be increased significantly in the nearest future while maintaining its familiar reliability and availability at the same time? In China’s national USC SPP demonstration project, Pingshan Phase II, this challenge is met by a double reheat cross compound turboset with one elevated and one conventional turbine layout, together with increased steam parameters of up to 325 bar and steam temperatures of up to 630°C. The nominal electrical capacity of the plant will be 1350 megawatts (MW). With this set up, a ‘half-net’ efficiency of more than 52.2 percent is expected [‘half-net’ = gross efficiency with generator power reduced by boiler feed water pump power consumption]. The first, elevated turbine train consists of two high-pressure modules having different pressure stages and one generator and it is located close to the main headers of the boiler at a height of appr. 83 meters. This unique turbine arrangement allows the expensive high-temperature pipes to be shortened, leading to substantially reduced pipe pressure losses and costs. The second turbine train will be installed on a conventional turbine deck at a height of appr. 17 meters and consists of two intermediate pressure and three low pressure turbine modules as well as a second generator. In this paper, the advanced steam turbine technology for this power plant concept is presented and discussed in detail. To achieve the next level of efficiency with an SPP today, the application of the 700°C material class is not possible to due to the slow progress of the associated technology development. It is more expedient to exploit the limits of the 600°C material class to the highest possible extent in USC conditions i.e. to the pressures and temperatures mentioned above. Design concept studies have shown that 52.2% ‘half-net’ efficiency cannot be achieved with a single reheat layout, so a double reheat (DRH) layout has been chosen. In addition, 1350 MW cannot be achieved with one turbine train (tandem compound), but only with two turbine trains (cross compound). In order to achieve the highest reliability possible, proven turbine design topologies and features have been used. The major change to the Siemens barrel type VHP turbine was a material change from 10% Chromium steels to FB2 and CB2. The HP turbine received increased wall thicknesses as well as a similar material change compared to a standard USC design. In order to control the oxidation at these elevated temperatures, oxidation protection measures have been applied where required. The startup procedure has been tailored specifically to the needs of a double reheat cross compound configuration.

Thermoeconomic Analysis of Power Plants With Integrated Exergy Stream

2000 ◽  
Author(s):  
Duck-Jin Kim ◽  
Hyun-Soo Lee ◽  
Ho-Young Kwak ◽  
Jae-Ho Hong
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Power Plants ◽  
Unit Cost ◽  
Combined Cycle ◽  
Cogeneration Plant ◽  
Steam Power ◽  
Unit Costs ◽  
Combined Cycle Plant ◽  
The Cost

Abstract Exegetic and thermoeconomic analysis were performed for a 500-MW combined cycle plant and a 137-MW steam power plant without decomposition of exergy into thermal and mechanical exergy. A unit cost was assigned to a specific exergy stream of matter, regardless of its condition or state in this analysis. The calculated costs of electricity were almost same within 0.5% as those obtained by the thermoeconomic analysis with decomposition of the exergy stream for the combined cycle plant, which produces the same kind of product. Such outcome indicated that the level at which the cost balances are formulated does not affect the result of thermoeconomic analysis, that is somewhat contradictory to that concluded previously. However this is true for the gas-turbine cogeneration plant which produces different kinds of products, electricity and steam whose unit costs are dominantly affected by the mechanical and thermal exergy respectively.

scholarly journals Air Pollution Dispersion Modelling using GRAL in Area Near Coal-Steam Power Plant at Central Java

2021 ◽  
Vol 12 (2) ◽  
pp. 15-24
Author(s):  
Januar Arif Fatkhurrahman ◽  
Ikha Rasti Julia Sari ◽  
Yose Andriani
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Dispersion Model ◽  
Observation Data ◽  
Grab Sampling ◽  
Steam Power ◽  
Steam Power Plant ◽  
Steam Power Plants ◽  
Hourly Data ◽  
Coefficient Corrélation

Sulfur dioxide and Nitrogen dioxide were significant emissions emitted from coal-steam power plants that may cause health problems for humans and damage the environment. Studying the SO2 and NO2 gradients in Indonesian residential communities is critical for evaluating resident's SO2 and NO2 exposure. The method developed to assist analysis of spatial SO2 and NO2 gradients on a community scale combines a mesoscale Lagrangian dispersion model with field observations around coal-steam power plants using GRAL. The objectives of this study focused on GRAL dispersion of SO2 and NO2 in an Indonesian residential community near the coal-steam power plant, with a 6 km x 8 km resolution. Analysis of this model indicates a correlation between simulation and observation, with SO2 coefficient correlation (R) within 0.5 – 0.82 and NO2 coefficient correlation (R) within 0.30 – 0.59. Model performances analyze by NMSE and FB. The SO2 model is comparable to observation data since it has a better average NMSE and FB than the NO2 model. Due to data limitation of observation collected by grab sampling instead of continuous ambient measurement system affect different respond time compared with hourly data from the model.

Technological investigations and efficiency analysis of a steam heat exchange condenser: conceptual design of a hybrid steam condenser

2008 ◽  
Vol 19 (3) ◽  
pp. 35-45 ◽  
Author(s):  
R.K. Kapooria ◽  
S. Kumar ◽  
K.S. Kasana
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Steam Pressure ◽  
Working Fluid ◽  
Feed Water ◽  
Steam Power ◽  
Analysis And Design ◽  
Steam Power Plant ◽  
Steam Power Plants

Most of the electricity being produced throughout the world today is from steam power plants. At the same time, many other competent means of gener-ating electricity have been developed viz. electricity from natural gas, MHD generators, biogas, solar cells, etc. But steam power plants will continue to be competent because of the use of water as the main working fluid which is abundantly available and is also reusable. The condenser remains among one of the key components of a steam power plant. The efficiency of a thermal power plant depends upon the efficiency of the condenser. In this paper, a the-oretical investigation about thermal analysis and design considerations of a steam condenser has been undertaken. A hybrid steam condenser using a higher surface area to diameter ratio of cooling a water tube has been analyzed. The use of a hybrid steam condenser enables higher efficiency of the steam power plant by lowering condenser steam pressure and increasing the vacuum inside the con-denser. The latent/sensible heat of steam is used to preheat the feed water supply to the boiler. A con-ceptual technological design aspect of a super vacu-um hybrid surface steam condenser has been theo-retically analyzed.

MATLAB AS A TOOL FOR THE TEACHING OF RANKINE CYCLE WITH SIMULATION OF A SIMPLE STEAM POWER PLANT

2015 ◽  
Vol 77 (28) ◽  
Author(s):  
Marwan Affandi ◽  
Ilmi Abdullah ◽  
Nurul Syahirah Khalid
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Rankine Cycle ◽  
Important Application ◽  
Steam Power ◽  
Power Cycles ◽  
Steam Power Plant ◽  
Steam Power Plants

Rankine cycle is one example of vapor power cycles. One important application is in steam power plants. Properties of the important points in the cycle can be found from steam tables. However, reading values from a steam table is rather inconvenient particularly when there are many values to be read such in a simulation. Interpolation must often be done since the table only provides values of properties at determined points. Using equations of states for steam is very convenient since values can be computed quickly. Unfortunately, equations of states for steam are very complicated. A program written in MATLAB to assist the teaching of Rankine cycle using steam has been developed. MATLAB is used since it is widely available. Using this program, a lecturer can easily modify a problem and get the answer quickly. Students can also benefit from the program where they can solve problems and compare the results that they will get manually.  

Integration of Steam Power Plant With Site Utility System Using a New Cogeneration Targeting Method

2012 ◽  
Author(s):  
Mohammad Hasan KhoshgoftarManesh ◽  
Sajad Khamis Abadi ◽  
Hooman Ghalami ◽  
Majid Amidpour
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Power Production ◽  
Steam Power ◽  
Steam Power Plant ◽  
Optimal Integration ◽  
Utility Systems ◽  
Utility System ◽  
Composite Curve

The purpose of a steam power plant usually is power production; however, it can work as a dual-purpose plant with the production of steam and power simultaneously. The aim of this paper was to find the optimum integration of steam power plant as a source and a site utility system as a sink of steam and power. Estimation of cogeneration potential prior to the design of the central utility system for site utility systems is vital to set targets on the site fuel demand as well as heat and power production. In this regard, a new cogeneration targeting model was developed for the integration of steam power plant and site utility of the process plant. The new procedure for finding the optimal integration was proposed based on new cogeneration targeting. In addition, a modified Site Utility Grand Composite Curve (SUGCC) diagram was proposed and compared with the original SUGCC A steam power plant and a process site utility was considered as a case study. The applicability of the developed procedure was tested with other existing design methods, STAR® and Thermoflex software through a case study. The proposed method was shown to give comparable results and the targeting method was used for obtaining optimal integration of steam levels. Identifying optimal conditions of steam levels for integration is very important in the design of utility systems since the selection of steam levels in steam power plants and site utility for integration heavily influence the potential for cogeneration and energy recovery for the site. In this work, the integration of steam levels of steam power plant and site utility system were carried out in a case study, in which the usefulness of the this method was clearly demonstrated for reducing the overall energy consumption for the site.

scholarly journals DAMPAK EKONOMI DAN SOSIAL BUDAYA PEMBANGKIT LISTRIK TENAGA UAP (PLTU) TERHADAP MASYARAKAT DI GAMPONG SUAK PUNTONG KABUPATEN NAGAN RAYA

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Triyanto Triyanto
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Point Of View ◽  
Human Society ◽  
Religious Activities ◽  
Chi Square ◽  
Steam Power ◽  
Steam Power Plant ◽  
Cultural Life ◽  
Chi Square Tests

Anything that is in around of human society always has an influence on the human himself. Similarly, the existence of a steam power plant (PLTU) located in Gampong Suak Puntong Nagan Raya. According to preliminary observations, researcher founds data on the existence of steam power plants have worried the community where some buildings are cracked due to the vibration of the soil during construction, heated air, dust, and wastewater suspected to be the cause of the disease. However, this study examines its impact from an economic and socio-cultural point of view. The formulation of the problem are how is the influence of the existence of PLTU to welfare? and how is the influence of the existence of PLTU to socio-cultural life?.The results showed that PLTU has an effect on improving people's welfare in Suak Puntong. This is proved by Pearson Chi-Square value in Asymp column. Sig. lower than 0.05 so that H0 is rejected and H1 accepted. While the power plant has no influence on the socio-cultural life of the community, this is proved by the value of Pearson Chi-Square in all tables in the Asymp column. Sig. Higher than 0.05, except for the Chi-Square Tests in the steam power plant that had assisted in the construction of the mosque against the religious activities of the community worth 0.000 and less than 0.05. But in general the value of Chi-Square Tests is higher than 0.05 so that H0 is accepted and H1 is rejected.Keywords: PLTU, Suak Puntong, Nagan Raya, Social Culture,

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