Approximate Analyses of Feed and District Heating Cycles for Steam Combined Heat and Power Plant

1987 ◽  
Vol 201 (3) ◽  
pp. 193-200 ◽  
Author(s):  
J H Horlock
Keyword(s):  
Power Plant ◽  
District Heating ◽  
Low Pressure ◽  
Combined Heat And Power ◽  
Energy Utilization ◽  
Steam Extraction ◽  
Saturated Water ◽  
The Difference ◽  
Number Of Cycles ◽  
Two Parameters

An assumption for turbine expansion lines originally made by Salisbury and Haywood (that the difference between local steam enthalpy and the enthalpy of saturated water at the same pressure is constant throughout the expansion) is used in approximate analyses of steam combined heat and power plant. Thermal efficiencies and energy utilization factors are derived for a number of cycles with steam extraction for feed heating and for district heating. Calculations of these two parameters are presented for relatively low pressure cycles.

Application of GE Low Load Package on an Existing District Heating Power Plant: A Case Study

2020 ◽  
Author(s):  
Antonio Mambro ◽  
Francesco Congiu ◽  
Francesco Piraccini
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
District Heating ◽  
Low Pressure ◽  
Heating Power ◽  
Low Pressure Turbine ◽  
Low Load ◽  
Flow Through ◽  
Last Stage

Abstract The continuous increase of variable renewable energy and fuel cost requires steam turbine power plants to operate with high flexibility. Furthermore, the reduction in electricity price is forcing many existing and new district heating power plants to further optimize the heat production to maintain a sustainable business. This situation leads to low pressure steam turbines running at very low volume flow for an extended time. In this work, a case study of an existing 30 MWel district heating power plant located in Europe is presented. The customer request was the removal of the steam turbine last two stages along with the condenser to maximize steam delivery for district heating operations. However, based on the experience gained by GE on low load during the last years, the same heat production has been guaranteed without any significant impact on the existing unit, excluding any major modification of the plant layout such as last stage blading and condenser removal. Making use of the latest low flow modeling, the minimum cooling flow through the low-pressure turbine has been reduced by more than 90% compared to the existing unit. Optimization of the hood spray system and logic will reduce trailing edge erosion during low load operation leading to a significant extension in the last stage blade lifetime. These modifications, commercialized by GE as the Advanced Low Load Package (ALLP), provide a cheap, flexible and effective solution for the customer. With today’s knowledge, GE has the capability to guarantee low load operation minimizing the mass flow through the low-pressure turbine to the minimum required for safe operation. As a benefit to the customer, this option allows a gain in operational income of about 1.5 M€ per year.

scholarly journals Analysis of the Impact of Decreasing District Heating Supply Temperature on Combined Heat and Power Plant Operation

2014 ◽  
Vol 14 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Alona Bolonina ◽  
Genadijs Bolonins ◽  
Dagnija Blumberga
Keyword(s):  
Power Plant ◽  
District Heating ◽  
Heating System ◽  
Combined Heat And Power ◽  
District Heating System ◽  
Heating Systems ◽  
Plant Operation ◽  
Operation Modes ◽  
Power Plant Operation ◽  
The Impact

Abstract District heating systems are widely used to supply heat to different groups of heat consumers. The district heating system offers great opportunities for combined heat and power production. In this paper decreasing district heating supply temperature is analysed in the context of combined heat and power plant operation. A mathematical model of a CHP plant is developed using both empirical and theoretical equations. The model is used for analysis of modified CHP plant operation modes with reduced district heating supply temperature. Conclusions on the benefits of new operation modes are introduced.

Application of Double-Used Absorption Heat Pump in Power Plants

2012 ◽  
Vol 542-543 ◽  
pp. 70-73 ◽  
Author(s):  
Xin Hui Cao ◽  
Guang Zhang ◽  
Xi Lun Wang ◽  
Yu Ning Zhang
Keyword(s):  
Power Plant ◽  
Energy Saving ◽  
Heat Pump ◽  
Power Plants ◽  
Waste Heat ◽  
Water Saving ◽  
Energy Utilization ◽  
Absorption Heat Pump ◽  
Quantitative Calculation ◽  
Steam Extraction

Absorption heat pump (AHP) heating in power plants in winter is an effective way to recover waste heat and make full use of energy. In this paper, quantitative calculation is taken to analyze the energy saving and economy efficiency of AHP heating in a power plant. The rate of energy utilization ηtp, the coal and water saving amount and the increased income of AHP heating are calculated. Results show AHP heating in power plants is superior to steam extraction heating both in energy saving and economy.

Improving the Energy Efficiency and Environmental Friendliness of a Combined Heat and Power Plant through the Use of Heat Absorption Transformers

Vestnik MEI ◽  
2020 ◽  
Vol 4 (4) ◽  
pp. 89-97
Author(s):  
Yuriy V. Yavorovsky ◽  
◽  
I′ldar A. Sultanguzin ◽  
Aleksey I. Bartenev ◽  
Stanislava A. Prishchepova ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Power Plant ◽  
Combined Heat And Power ◽  
Heat Absorption ◽  
Environmental Friendliness

Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant

2015 ◽  
Vol 52 (4) ◽  
pp. 214-225 ◽  
Author(s):  
E. Plesiutschnig ◽  
R. Vallant ◽  
G. Stöfan ◽  
C. Sommitsch ◽  
M. Mayr ◽  
...  
Keyword(s):  
Power Plant ◽  
Turbine Blades ◽  
Low Pressure ◽  
Steam Power ◽  
Steam Power Plant ◽  
Low Pressure Turbine

Analysis and calculation of the process of low-pressure reverse osmosis during recycling of hygienic water

2019 ◽  
pp. 28-36
Author(s):  
Leonid S. Bobe ◽  
Nikolay A. Salnikov
Keyword(s):  
Mass Transfer ◽  
Reverse Osmosis ◽  
Life Support ◽  
Space Station ◽  
Low Pressure ◽  
Operating Pressure ◽  
Life Support System ◽  
Cleaning Agent ◽  
The Difference ◽  
Pressure Channel

Analysis and calculation have been conducted of the process of low-pressure reverse osmosis in the membrane apparatus of the system for recycling hygiene water for the space station. The paper describes the physics of the reverse osmosis treatment and determines the motive force of the process, which is the difference of effective pressures (operating pressure minus osmotic pressure) in the solution near the surface of the membrane and in the purified water. It is demonstrated that the membrane scrubbing action is accompanied by diffusion outflow of the cleaning agent components away from the membrane. The mass transfer coefficient and the difference of concentrations (and, accordingly, the difference of osmotic pressures) in the boundary layer of the pressure channel can be determined using an extended analogy between mass transfer and heat transfer. A procedure has been proposed and proven in an experiment for calculating the throughput of a reverse osmosis apparatus purifying the hygiene water obtained through the use of a cleaning agent used in sanitation and housekeeping procedures on Earth. Key words: life support system, hygiene water, water processing, low-pressure reverse osmosis, space station.

Analysis of gas turbine combined heat and power system for carbon capture installation of coal-fired power plant

Energy ◽  
2012 ◽  
Vol 45 (1) ◽  
pp. 125-133 ◽  
Author(s):  
Tadeusz Chmielniak ◽  
Sebastian Lepszy ◽  
Katarzyna Wójcik
Keyword(s):  
Power Plant ◽  
Power System ◽  
Gas Turbine ◽  
Carbon Capture ◽  
Combined Heat And Power
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