Optimization on Coordinate Control Strategy Assisted by High-Pressure Extraction Steam Throttling to Achieve Flexible and Efficient Operation of Thermal Power Plants

2021 ◽  
Author(s):  
Zhu Wang ◽  
Ming Liu ◽  
Hui Yan ◽  
Junjie Yan
Keyword(s):  
High Pressure ◽  
Control Strategy ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Efficient Operation ◽  
Coordinate Control ◽  
Pressure Extraction

scholarly journals Investigation of the saturated steam sampling method influence on the sample representativeness in chemical control systems at thermal power plants

2021 ◽  
Vol 2088 (1) ◽  
pp. 012052
Author(s):  
O V Yegoshina ◽  
S K Zvonareva
Keyword(s):  
High Pressure ◽  
Chemical Control ◽  
Power Plants ◽  
Thermal Power ◽  
Steam Line ◽  
Saturated Steam ◽  
Thermal Power Plants ◽  
Sample Representativeness ◽  
Main Steam Line ◽  
Main Steam

Abstract The most important requirement for sampling is the sample representativeness, which is achieved by the design and location choice of sample nozzle, as well as the speed mode and the presence of sharp pressure drops in the saturated steam flow. The Ansys CFX software package simulates the sampling processes saturated steam in power units with low, medium and high pressure boilers which are used on operating thermal power plants. The saturated steam was sampled from low-pressure boiler by a single-strip probe with a Venturi nozzle, from the medium-pressure boiler was sampled by tapping a pipe at 90 to the main steam line, and the steam of the high – pressure boiler was sampled by a wellhead probe. In three sampling cases it is found that of saturated steam, the flow in the sample nozzle loses speed and decreases to values unacceptable for the selection of a representative sample-below tear rate of the moisture film from the surface. It is confirmed that in the industrial sampling conditions, the condition of speeds equality in the main steam line and in the sample nozzle is not met, which leads to a violation of the sample representativeness. The paper studies the change in the composition of the sampled saturated vapor sample after the film formation on the sample’s nozzle wall in relation to power units with ammonia dosing. It was found that the sample received by the chemical control analyzers is depleted due to the formation of a film and the ferrum and ammonia concentration in moisture droplets on the inner surface of the sampling line.

scholarly journals Combined electromachine generators for energy-efficient mini-power plants

2018 ◽  
Vol 251 ◽  
pp. 03038
Author(s):  
Igor Zabora
Keyword(s):  
High Pressure ◽  
Energy Efficient ◽  
Power Plants ◽  
Design Principle ◽  
Thermal Power ◽  
Electric Machines ◽  
Thermal Power Plants ◽  
High Pressure And Temperature ◽  
Moving Media ◽  
Extreme Parameters

The design, principle of operation and features of new combined electric machine – generator-transformer unit (GTU) are considered. The units are designed for generating units of mini thermal power plants with extreme parameters of moving media (steam-gas, gas-liquid, etc.) at high pressure and temperature. The possibility of reliable and efficient conversion of electric power by means of electric machines directly in sealed objects with extreme environmental conditions with help of new GTU is shown.

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