scholarly journals ANALISIS PENGARUH VIBRASI TERHADAP PERFORMA BOILER FEEDWATER PUMP (BFP) 3B PLTU ASAM ASAM

JTAM ROTARY ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 235
Author(s):  
Yanuar Iswahyudi
Keyword(s):  
Electric Power ◽  
Continuous Operation ◽  
Total Efficiency ◽  
Calculation Data ◽  
Feedwater Pump ◽  
Boiler Feedwater

Pada Desember 2016 hingga Januari 2017, terjadi penurunan kinerja PLTU Asam Asam Unit 3 yang signifikan dalam penyediaan tenaga listrik. Hal ini dikarenakan adanya permasalahan pada Boiler Feedwater Pump (BFP) 3B. Kemudian masalah harus diselesaikan oleh Turbin dan Kru Pemeliharaan Tambahan dengan beberapa perbaikan. Perbaikan BFP 3B berada pada masalah jarak jalan internal dan masalah poros tekuk. Setelah diperbaiki, data perhitungan menunjukkan bahwa efisiensi total pompa meningkat sebesar 10%, dan zona getaran berpindah dari zona D (berbahaya) ke zona A (aman untuk pengoperasian berkelanjutan). In December 2016 until January 2017, there was a significant decreasing performance of Unit 3 PLTU Asam Asam in supplying electric power. This was because of some problems in Boiler Feedwater Pump (BFP) 3B. Then the problems have to be solved by the Turbine and Auxiliary Maintenance Crew by some repairs. The repair of BFP 3B are in the internal running clearance problem and bending shaft problem. After the repair of them, calculation data show that the pump total efficiency increasing by 10 %, and the vibration zone move from D zone (dangerous) to A zone (safe for continuous operation).

Development of a Highly Efficient Diesel Engine Boiler System With a Secondary Combustor

2008 ◽  
Author(s):  
D. H. Lee ◽  
Y. S. Cha ◽  
J. S. Lee ◽  
D. K. Lee ◽  
H. J. Park ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Electric Power ◽  
Heat Exchangers ◽  
Waste Heat ◽  
Finned Tube ◽  
Total Efficiency ◽  
Generation Efficiency ◽  
Exhaust Gases ◽  
Highly Efficient ◽  
Unburned Fuel

We have developed a highly efficient boiler system using the 930 cc diesel engine. In this system, the co-generation concept is utilized in that the electric power is produced by the generator connected to the diesel engine, and waste heat is recovered from both the exhaust gases and the engine itself by the finned tube and shell & tube heat exchangers. A specially designed secondary combustor is installed at the engine outlet in order to completely reignite the unburned fuel from the diesel engine, thereby improving a system’s efficiency as well as reducing air pollution due to exhaust gases. It is found that the total efficiency (thermal efficiency plus electric power generation efficiency) of this system reaches maximum 94.4% which is about 20% higher than the typical diesel engine boiler system currently being used worldwide.

A Study on the Effects of Reburning in Secondary Combustor on Efficiencies and Emission Reduction in Diesel Engine Boiler System

2009 ◽  
Author(s):  
Dae Hee Lee ◽  
Jun Sik Lee
Keyword(s):  
Diesel Engine ◽  
Electric Power ◽  
Water Flow ◽  
Heat Exchangers ◽  
Emission Reduction ◽  
Diesel Oxidation Catalyst ◽  
Oxidation Catalyst ◽  
Steel Shell ◽  
Total Efficiency ◽  
Exhaust Gases

An experimental study on the effects of secondary combustion on efficiencies and emission reduction in the Diesel engine boiler system has been undertaken. The co-generation concept is utilized in that the electric power is produced by the generator connected to the Diesel engine, and heat is recovered from both combustion exhaust gases and the engine by the fin-and-tube and shell-and-tube heat exchangers, respectively. A specially designed secondary combustor is installed at the engine outlet in order to reburn the unburned fuel from the Diesel engine, thereby improving the system’s efficiency as well as reducing air pollution caused by exhaust gases. The main components of the secondary combustor are coiled Nichrome wires heated by the electric current and Diesel Oxidation Catalyst (DOC) housed inside a well insulated stainless steel shell. The performance tests were conducted at four water flow rates of 5, 10, 15 and 20 L/min and five electric power outputs of 3, 5, 7, 9 and 11 kW. The results show that at a water flow of 20 L/min and a power output of 9 kW, the total efficiency (thermal efficiency plus electric power generation efficiency) of this system reaches a maximum 94.4% which is approximately 20% higher than that of the typical Diesel engine boiler system. Besides, the use of the secondary combustor and heat exchangers results in 80%, 35%, and 90% reduction of carbon monoxide (CO), nitrogen oxide (NOx) and particulate matter (PM), respectively.

Efficiency Optimization of a 30MW Main Boiler Feedwater Pump Using CFD and Scaled Model Tests

2013 ◽  
Author(s):  
Pieter Teesink ◽  
Frank Visser ◽  
Jeroen Jochems
Keyword(s):  
Carbon Dioxide Emissions ◽  
Power Plants ◽  
Thermal Power ◽  
Model Tests ◽  
Electricity Production ◽  
Scaled Model ◽  
Design Constraint ◽  
Feedwater Pump ◽  
Energy Consuming ◽  
Boiler Feedwater

Environmental impact of electricity production has come under increasing international scrutiny over the last few decades. In particular, fossil fuel-fired power plants constitute a significant portion of the world’s carbon dioxide emissions. One of the main internal energy-consuming components in a thermal power plant is the main boiler feedwater pump, and its efficiency is a contributor to overall plant efficiency. This paper reports the design optimization of a 30 MW multistage, double-case, volute pump in order to increase overall efficiency by at least three percentage points. The six stage barrel pump produces 3865 m (12680 ft) of head at a capacity of 2750 m3/hr (12100 USGPM) at a speed of 4665 RPM. The machine is installed at the coal-fired supercritical Nuon Hemweg 8 power station in Amsterdam, the Netherlands, as the main boiler feedwater pump. The design study employed Computational Fluid Dynamics (CFD) to identify energy losses and evaluate design iterations. This paper describes the optimization of several individual components, including volutes, short and long crossovers, suction box and final discharge. Scaled model tests were conducted on series stages to validate the CFD results. Additional design constraint that had to be taken into account was that new hardware had to be installed within the limits of the existing pressure boundary components, sealing device and bearing design, which confines the design space considerably. Hardware has, at the time of writing this paper, entered production and is planned to be installed during a May 2013 plant outage.

Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine

2020 ◽  
pp. 095765092096946
Author(s):  
Selcuk Selimli ◽  
Savas Sunay
Keyword(s):  
Steel Production ◽  
Low Pressure ◽  
Production Plant ◽  
Pressure Reduction ◽  
Iron And Steel ◽  
Feedwater Pump ◽  
Pressure Steam ◽  
Iron And Steel Production ◽  
Wasted Energy ◽  
Boiler Feedwater

The low-pressure steam requirement in the iron and steel production plant is obtained through pressure reduction stations with unrestrained expansion. In this study, the feasibility of obtaining the low-pressure steam that is needed in the plant in a backpressure turbine instead of pressure reduction stations has been studied. In this way, it is foreseen that a significant amount of wasted energy during the unrestrained expansion in pressure reduction stations, can be recovered as shaft work during the expansion process performed in the turbine. The obtained shaft work is planned to be used in the boiler feedwater pump drive. It is aimed to increase the efficiency of the system by the deactivation of boiler feedwater pump electric motors and as well as bringing the energy that is lost during the unrestrained expansion of the superheated steam to the system through the pump drive. The estimated size of energy saving of the system could be reached to 33.74%. The annual size of achievable saving has been determined by approximately 8,094,810 kWh and economically $509,973. The payback period of the estimated $683,079 investment is 1.34 years. A determined amount of saving is also equivalent to the reduction of 7,285,329 kg CO2 emission, annually.

Field Demonstration of a Boiler Feedwater Pump Upgraded to Reduce Vibration and Acoustic Emissions Without Compromising Performance

2000 ◽  
Author(s):  
John F. Marchi ◽  
R. Frank Bush
Keyword(s):  
Acoustic Emissions ◽  
High Energy ◽  
Hydraulic Performance ◽  
Centrifugal Pumps ◽  
Steam Generation ◽  
Pump Design ◽  
Multi Stage ◽  
Feedwater Pump ◽  
Wide Range ◽  
Boiler Feedwater

Abstract The high-energy boiler feedwater pump is the heart of the steam-generation cycle in modern high-pressure boiler systems. These multi-stage centrifugal pumps are engineered to produce system pressures from 12 MPa (1800 lb/in2) to 45 MPa (6500 lb/in2) at temperatures ranging from 150°C (300°F) to 312°C (600°F). To optimize pump hydraulic performance, pump designers have focused on impeller and diffuser vane angles, hydraulic passageway shapes and minimized impeller-to-diffuser vane clearances to maximize performance within a narrow range of operation. This was the approach that had been applied successfully on lower energy pump design of an earlier era. However, in the mid-1980s, in response to market forces, operators began to cycle and operate plants over a wide range of loads, which was contrary to the original plant designs. This new operating paradigm has resulted in unacceptable vibration and acoustic emissions that are often attributable to impeller-to-diffuser vane interaction (a result of the minimized clearances referenced previously). Efforts to reduce these emissions by changing the design must always be balanced with the potential impact on hydraulic performance. This paper uses operating field data taken from boiler feedwater pumps to prove that by: • optimizing hydraulic passageways and • changing the internal geometry, specifically, impeller-to-diffuser vane combinations, vibration and acoustic emissions are reduced without compromising hydraulic performance.

scholarly journals A Couple of Generator and Motor as Electric Transmission System of a Driving Shaft to Long Distance Driven Shaft

2018 ◽  
Vol 67 ◽  
pp. 01013 ◽  
Author(s):  
Iswanjono ◽  
Y.B. Lukiyanto ◽  
Budi Setyahandana ◽  
Rines
Keyword(s):  
Electric Power ◽  
Electric Machines ◽  
Total Efficiency ◽  
Market Place ◽  
Electrical Transmission ◽  
Long Distance ◽  
Electric Generator ◽  
Electric Transmission ◽  
Shaft Power ◽  
Cable Lines

Wind energy converter commonly converts wind power to shaft and electric power. One of the problems of transmitting shaft power is the limited distance between the driving to the driven shaft. This paper describes an experimental study of electrical transmission from driving to the driven shaft that was carried out on three modes of cable lines transmission. The driving shaft was attached to an electric generator that converts shaft r to electric power. The driven shaft was coupled by electric motor which reconverts the electric to shaft power. The generator and motor were BLDC and BDC permanent magnet electric machines. The distance of the driving to the driven shaft was 300 meters. The electric power was transmitted using wires. The wires consisted of 2 and 3 cables commonly used by peoples and sold in market place. The results showed that electric transmission mode on the experiment has important role on performance of shaft power to electric power conversion on driving generator and energy losses on cables transmission. DC on small wires electric transmission gave total efficiency of 16.2 %. DC on large wires electric transmission gave total efficiency of 32.9 %. AC on large wires electric transmission gave total efficiency of 36.4 %.

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