Retrofitting a Steam Power Cycle by Using Water From the Interstage Feed Water Pump as Reheat Spray

2008 ◽  
Author(s):  
M. H. Saidi ◽  
A. Irani R. ◽  
S. M. S. Mousavi
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Feed Water ◽  
Water Pump ◽  
Steam Temperature ◽  
Power Cycle ◽  
Pump Head ◽  
Reheat Steam ◽  
Gas Recirculation

Various methods are used in thermal power plants to adjust the superheated or reheated steam temperature to a pre-determined set point, including flue gas recirculation, using tilting burners and spray of water from discharge of feed water pump, etc. In this paper, an innovative method is presented to control the reheater temperature by tapping water from an interstage of the feed water pump to control reheater temperature at the Bisotoun Power Plant (a steam cycle based power plant in the western Iran). The spray water for the superheaters is secured from the discharge of feed water pump, but interstage water, instead of gas recirculation or using tilting burner, is used to control the reheater temperature. The total cycle is simulated with this arrangement and the results are compared with power plant actual data. Here, the variation of pump head and its power consumption is investigated as well. The tapped water requirement is calculated in terms of controlling reheat steam temperature at different loads.

scholarly journals Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4253
Author(s):  
Meng Yue ◽  
Guoqian Ma ◽  
Yuetao Shi
Keyword(s):  
Flue Gas ◽  
Feed Water ◽  
Steam Temperature ◽  
Intermediate Point ◽  
Point Temperature ◽  
Excess Air ◽  
Low Load ◽  
Reheat Steam ◽  
Gas Recirculation ◽  
Feed Water Temperature

In this paper, the simulation software EBSILON is used to simulate the reheat units, and the reheat temperature control mode is deeply explored. In the benchmark system, the influence of different load intermediate point temperature on the flue gas recirculation (FGR) is analyzed. Then, the effects of load, coal quality, excess air factor, and feed water temperature on FGR are studied under the premise of intermediate point temperature as design value, and the cause for FGR change is analyzed by comparing the cutoff bypass flue (CBF) system. The results show that under any load, the FGR decreases with the increase of the intermediate point temperature, while under low load, the change of the intermediate point temperature has a greater impact on the FGR rate. When the intermediate point temperature remains constant, the FGR plunge has an increase of load at low load and is almost unchanged at high load; the FGR rate of coal with low calorific value and high moisture content is low and the coal with low volatile and high ash content has great influence on reheat steam temperature; and the excess air factor and feed water temperature are inversely proportional to the flue gas recirculation rate. In the CBF system, the change trend is similar to the reference system, but under the same working condition, the FGR rate is higher than the latter.

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.

The Thermal–Hydraulic Design of Main Feed Water Pump Suction Systems for Large Thermal Power Plant

1985 ◽  
Vol 199 (4) ◽  
pp. 215-227 ◽  
Author(s):  
Lawrence Dartnell
Keyword(s):  
Power Plant ◽  
Thermal Power ◽  
Pressure Rise ◽  
Feed Water ◽  
Correct Identification ◽  
Design Practice ◽  
Water Pump ◽  
Pressure Decay ◽  
Hydraulic Design ◽  
Domestic Design

British domestic design practice is described for boiler feed pump suction systems associated with high level deaerator/feed water tanks in large modern power plant. The objective of thermal–hydraulic design is the provision of adequate pressure to boiler feed water pump suctions under all transient and steady state conditions to ensure continuity of water flow and reliable pump operation. Methods are available for the determination of pressure decay in feed tanks during load transients, but the successful application of mathematical relationships between pressure decay and pressure rise in suction pipework depends on the correct identification of operational circumstances. Progress in recent years has been on the identification of circumstances which produce governing conditions and has taken design practice beyond the stage established by early workers. Developed practice has been successfully applied by the Central Electricity Generating Board and its main plant contractors to forty-nine 500 MW units in coal- and oil-fired stations and to twenty-three 660 MW units in coal, oil and advanced gas-cooled reactor stations, which at 39 680 MW, constitutes the major proportion of plant in England and Wales. Aspects of plant behaviour and operation crucial to successful system design are featured. Recommendations are made for plant layout, pipework routing, tank outlet and pipework sizing, net positive suction head (NPSH) determination etc.

Repowering of a Rankine Cycle Power Plant by Means of Concentrating Solar Collectors

2011 ◽  
Author(s):  
Sergio M. Camporeale ◽  
Bernardo Fortunato ◽  
Alessandro Saponaro
Keyword(s):  
Power Plant ◽  
Solar Energy ◽  
Steam Turbine ◽  
Power Plants ◽  
Thermal Power ◽  
Peak Load ◽  
Rankine Cycle ◽  
Feed Water ◽  
Partial Load ◽  
Steam Turbine Condenser

Repowering of an existing steam power plant by means of solar concentrating collectors is examined as a viable option to decrease CO2 emissions and increase electric power production during daytime peak load energy demanding hours. In the proposed scheme, the regenerative bleeds from the steam turbine are partially intercepted while boiler feed-water is heated by means of parabolic solar trough concentrating collectors. It is considered that fossil boiler, steam turbine and condenser are the same of the original plant, without modifications. After choosing a steam cycle reproducing an existing power plant, the scheme of solar repowering is examined and the efficiency of conversion of the solar energy is optimized in relation to the characteristics of the solar collector. The paper shows that the modified scheme produces very little effects on the working conditions of the existing components, either at full load or partial load, and does not reduce the conversion efficiency of the fossil fuel. In comparison with solar thermal power plants with heat storage and only solar energy as thermal input, the proposed scheme is expected to have comparable efficiency but lower costs per kWh produced, as a consequence of the fact that there is no need for steam turbine, condenser, cooling tower and auxiliary boiler. Moreover it is expected that personnel and maintenance costs will be lower.

scholarly journals Increasing flexibility of coal power plant by control system modifications

2016 ◽  
Vol 20 (4) ◽  
pp. 1161-1169 ◽  
Author(s):  
Ante Marusic ◽  
Drazen Loncar ◽  
Jakov Batelic ◽  
Valdi Frankovic
Keyword(s):  
Control System ◽  
Thermal Stress ◽  
Power Plant ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Steam Temperature ◽  
Coal Power Plant ◽  
Safety Margins ◽  
Coal Power

Expanding implementation of intermittent renewable energy sources has already started to change the role of thermal power plants in energy systems across Europe. Traditionally base load plants are now forced to operate as peaking plants. A familiar transition in upcoming years is expected in Croatia and coal power plant operators are preparing accordingly. To evaluate cycling capabilities and control system operation for flexible operation of selected 210 MW coal plant, series of tests with different load gradients were performed and results were thoroughly analyzed. Two possible ?bottlenecks? are identified, thermal stress in superheater header, and achievable ramping rate considering operational limitations of coal feeders, firing system and evaporator dynamics. Several unexpected readings were observed, usually caused by malfunctioning sensors and equipment, resulting in unexpected oscillations of superheated steam temperature. Based on superheater geometry and experimental data, maximal steam temperature gradient during ramping was evaluated. Since thermal stress was well inside the safety margins, the simulation model of the whole boiler was used to evaluate achievable ramping on electric side.

scholarly journals Failure Analysis in High Pressure Feed Water Heaters and Method to Find the Defect in Tubes

2019 ◽  
Vol 8 (6S2) ◽  
pp. 593-599
Keyword(s):  
High Pressure ◽  
Power Plant ◽  
Power Plants ◽  
High Weight ◽  
Thermal Power ◽  
Feed Water ◽  
Shell Side ◽  
Economical Method ◽  
Water Heaters ◽  
Plant Test

The aim of this study is to analyze the causes of tube failure of the high pressure feed water heaters in thermal power plants and to find out the defective tubes in high pressure feed water heaters using simple and economical method. A feed water warmer is utilized to preheat the kettle feed water in warm power plant. The majority of the feed water radiator utilized in warm power plant is shell and cylinder type. In this kind of feed water warmer, water streaming inside the cylinder and steam consolidating in outside of the cylinder i.e., shell side. The wellspring of warmth utilized in high weight feed water warmer is steam seep from the turbine. The high weight feed water radiators are utilized to improve the thermodynamic effectiveness of the cycle and furthermore diminish the coal utilization of the warm power plant. Test of the disappointment cylinder were taken to investigate the reasons for cylinder disappointment in high weight feed water radiator by visual review, utilizing tube thickness estimation examination, Examining Mechanical properties and substance structure of the cylinder material and strategies for finding the cylinder disappointment ahead of time to counteract the breakdown of high weight feed water warmers. In light of the above investigations, it is seen that the high weight feed water warmer cylinders disappointment happened because of cylinder external distance across disintegration.

scholarly journals Case study on the effectiveness of condition monitoring techniques for fault diagnosis of pumps in thermal power plant

2019 ◽  
Vol 23 (1) ◽  
pp. 70-75 ◽  
Author(s):  
Caneon Kurien ◽  
Ajay Kumar Srivastava
Keyword(s):  
Power Plant ◽  
Condition Monitoring ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Cooling Water ◽  
Failure Detection ◽  
Feed Water ◽  
Water Pump ◽  
Monitoring Techniques

Abstract A case study was carried out to investigate the effectiveness of condition monitoring techniques in the early failure detection of pumps in a thermal power plant. Various condition monitoring techniques used in this case study involved vibration analysis, motor current signature analysis, noise monitoring and wear debris analysis. These techniques were applied on the three pumps, namely boiler feed water pump, auxiliary cooling water pump and condensate extraction pump, which have to work continuously for the operation of the thermal power plant. Vibration analysis of the auxiliary cooling water pump showed that there is a rising trend in the acceleration values at its driving and non-driving end indicating the deterioration of bearings. Motor current index range of all the pumps was found to be within acceptable limits. Wear debris analysis of lubricant in the hydraulic coupling of boiler feed water pump indicated the presence of sand, dirt and low alloy steel sliding wear particles in it. Condition monitoring techniques have been proved to be an effective technique in early failure detection of pumps.

Nonlinear Trend Analysis of Mill Fan System Vibrations for Predictive Maintenance and Diagnostics

2012 ◽  
Vol 58 (4) ◽  
pp. 351-356
Author(s):  
Mincho B. Hadjiski ◽  
Lyubka A. Doukovska ◽  
Stefan L. Kojnov
Keyword(s):  
Power Plant ◽  
Trend Analysis ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Balkan Peninsula ◽  
Predictive Maintenance ◽  
Nonlinear Trend ◽  
The Subject ◽  
The Given

Abstract Present paper considers nonlinear trend analysis for diagnostics and predictive maintenance. The subject is a device from Maritsa East 2 thermal power plant a mill fan. The choice of the given power plant is not occasional. This is the largest thermal power plant on the Balkan Peninsula. Mill fans are main part of the fuel preparation in the coal fired power plants. The possibility to predict eventual damages or wear out without switching off the device is significant for providing faultless and reliable work avoiding the losses caused by planned maintenance. This paper addresses the needs of the Maritsa East 2 Complex aiming to improve the ecological parameters of the electro energy production process.

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