scholarly journals A Variable Condition Calculation Method for Thermal Power Units Sliding Pressure Operation

2013 ◽  
pp. 211-215 ◽  
Author(s):  
Wei Liu ◽  
Jizhen Liu ◽  
Wei Wang ◽  
Deliang Zeng ◽  
Taihua Chang
Keyword(s):  
Calculation Method ◽  
Thermal Power ◽  
Sliding Pressure ◽  
Variable Condition

On-Line Calculation Method of Exhaust Steam Humidity Based on BP Neural Network for Steam Turbine

2013 ◽  
Author(s):  
Likun Zheng ◽  
Chang Chen ◽  
Danmei Xie ◽  
Hengliang Zhang ◽  
Yanzhi Yu
Keyword(s):  
Neural Network ◽  
Steam Turbine ◽  
Bp Neural Network ◽  
Calculation Method ◽  
Thermal Power ◽  
Engineering Application ◽  
Measuring Method ◽  
Factors Affecting ◽  
On Line ◽  
Turbine Exhaust

For condensing turbine, steam exhaust point is in wet steam area. The exhaust steam humidity of steam turbine is difficult to get due to lacking of effective measuring method. Calculation of exhaust steam humidity has always been one of the key parts of the analysis of thermal power units. The main factors affecting exhaust steam humidity are turbine load and turbine exhaust pressure etc, and they are of non-linearity. This paper develops a calculation method to calculate exhaust steam humidity based on BP neural network. Taking a N1000-25/600/600 ultra-supercritical (USC) steam turbine as an example, the exhaust steam humidity is calculated and the results show that the method has a good accuracy to meet the needs of the engineering application.

scholarly journals Intelligent Calculation Method and Algorithm Optimization of Consumption Reducing for SCR and SNCR in Denitriation System

2021 ◽  
Vol 2083 (4) ◽  
pp. 042040
Author(s):  
Kaiqiang Li ◽  
Xiaobing Chen
Keyword(s):  
Power Plant ◽  
Calculation Method ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Algorithm Optimization ◽  
Environmental Laws ◽  
Typical Configuration ◽  
Scr System

Abstract Since the environmental laws have been more and more strict about pollutants emissions of thermal power plant, SNCR and SCR system seems to be typical configuration. However the ammonia consumption calculation differs from different designers. In this paper the popular and experienced calculation method is introduced for thermal power plant dinitriation system.

scholarly journals Compare the Calculations of Steam Extraction Efficiency of Power Plant Turbine by Simple Heat Balance Method and Equivalent Enthalpy Drop Method

2020 ◽  
Vol 204 ◽  
pp. 02011
Author(s):  
Yuanyuan Li ◽  
Tongrui Cheng ◽  
Zhenning Zhao ◽  
Liangcai Xu
Keyword(s):  
Power Plant ◽  
Heat Balance ◽  
Composite Structure ◽  
Calculation Method ◽  
Extraction Efficiency ◽  
Thermal Power ◽  
Balance Method ◽  
Computational Results ◽  
Drop Method ◽  
Steam Extraction

At present, the calculation method of steam extraction efficiency of power plant turbine have five methods: heat balance method, equivalent enthalpy drop method, cyclicfunctional method, composite structure method and matrix method. In this paper, a 600MW grade subcritical thermal power plan is take as an examplefor comparing the calculation by the simple heat balance method and the equivalent enthalpy drop method. The result shows that the computational results of simple heat balance method agree with equivalent enthalpy drop method. So simple heat balance method can be used to replace equivalent enthalpy drop method in order to reduce calculation amount in practicalapplication.

Determination of the Optimal Initial Steam Pressure for the Power Plant Under Different Loads

2012 ◽  
Vol 622-623 ◽  
pp. 1067-1071
Author(s):  
De Liang Zeng ◽  
Can Peng ◽  
Zhao Liang Guan ◽  
Rui Shen
Keyword(s):  
Power Plant ◽  
System Analysis ◽  
Thermal Power ◽  
Initial Point ◽  
Initial Pressure ◽  
Steam Pressure ◽  
Heat Absorption ◽  
Main Steam ◽  
Passage Efficiency ◽  
Variable Condition

Combined with the thermal system analysis, the mathematical model for selecting the optimal initial pressure of the power unit is established based on the comprehensive consideration of the effect of main steam pressure on governing stage efficiency, steam feed pump consumption and flow passage efficiency. Then the steam pressure with the maximum unit efficiency is searched using variable condition calculation. With quantitative calculations of N600-16.7/537/537-I unit of Pan Shan thermal power plant taken as an example, the optimal initial pressure is obtained by exhaustive method around the 75% load point. The results reveal that the unit power, heat absorption and unit efficiency all increase with the increase of the main steam pressure. However, the increasing velocity of efficiency is less than heat absorption when main steam pressure attains to certain value, which makes the unit efficiency begin to decrease. Therefore, this main steam pressure is the optimal initial point to be searched.

Smart Design System for Coal-Fired Boiler Buildings in Thermal Power Plants

2008 ◽  
Author(s):  
Naohiro Kusumi ◽  
Naoyuki Nagafuchi ◽  
Eiji Murakami ◽  
Noriyuki Ichinose ◽  
Masakatsu Imamura
Keyword(s):  
Support Function ◽  
Power Plants ◽  
Thermal Power ◽  
Steel Structures ◽  
Design System ◽  
Thermal Power Plants ◽  
Building Layout ◽  
General Arrangement ◽  
Sliding Pressure ◽  
Bill Of Quantity

To meet expanding energy requirements, supercritical sliding pressure operation has become a major trend in recent thermal power plants. The technology for this operation was developed as high efficient thermal power plants with lower emission. We have continued to develop supercritical steam plant with sliding pressure operation to meet the demand for high efficiency coal-fired power plants that has arisen due to circumstances such as high fuel prices, exacting plant site requirements, and very strict environmental requirements. Because of our accumulated expertise and practical experience, we have received orders for several coal-fired engineering, procurement, and construction (EPC) projects. We have developed a smart design system for a coal-fired boiler building using an information technology (IT) tool for a large-scale and complex system design. We call this design system the Flexible Engineering System. This system is composed of three support functions: boiler general arrangement, boiler building layout, and bill of quantity estimation. First, the boiler general arrangement support function enables us to automatically create basic engineering specifications based on the required specifications. This system generates the basic engineering required using parametric engineering practice with parameterization of several required specifications. Second, the support function of the boiler building layout planning enables us to make 3-D models of the boiler building automatically. The 3-D models of the boiler, coal silos, and air and gas ducts are generated from the boiler general arrangement. The 3-D models of the steel structures are generated from loading data. The steel structure and brace models can even reflect the results of stress analysis. The 3-D models of large components, for example, the pulverizer, forced draft fan, etc., are arranged by selecting a matching model from the data library. The 3-D piping models are generated along the optimum path routing using a search method that combines dynamic programming with a layout rule-base. The 3-D floor and head-clearance model, which means a walk space and a maintenance space, are generated taking into consideration layout rules such as those concerning installation and maintenance. This support system can check for interference between the steel structures and each component. Third, the support function of the bill of quantity estimation makes it possible to estimate the quantity of materials from the specification data and configuration data of the 3-D models. The developed system is now under operation. The results indicate that it provides high engineering accuracy and reliability.

Off-Design Exergy Audit of a Thermal Power Station

1988 ◽  
Vol 110 (2) ◽  
pp. 166-172 ◽  
Author(s):  
E. Yasni ◽  
C. G. Carrington
Keyword(s):  
Thermal Power Station ◽  
Thermal Power ◽  
Pressure Control ◽  
Analysis Procedure ◽  
Second Law ◽  
Operating Parameters ◽  
Power Station ◽  
Audit Data ◽  
On Line ◽  
Sliding Pressure

A second-law state analysis procedure, having on-line capability, has been implemented at a fossil-fueled power station at Huntly, N.Z. The analysis fully integrates the combustion and steam processes in order to provide a viable understanding of the influence of operating parameters on the distribution of losses within the plant. The procedures do not rely significantly on manufacturer’s performance data and the validity of the audit is substantially verifiable. Examples of audit data are presented, including operation with and without the top heater and a comparison of throttle and sliding pressure control.

scholarly journals Efficiency of operation of 300 MW condensing thermal power blocks with supercritical steam parameters in sliding pressure mode

2018 ◽  
Vol 22 (Suppl. 5) ◽  
pp. 1371-1382
Author(s):  
Zdravko Milovanovic ◽  
Svetlana Dumonjic-Milovanovic ◽  
Aleksandar Milasinovic ◽  
Darko Knezevic
Keyword(s):  
Water Pressure ◽  
Thermal Power ◽  
Operation Mode ◽  
Feed Water ◽  
Steam Boiler ◽  
Load Range ◽  
Supercritical Steam Parameters ◽  
Internal Action ◽  
Sliding Pressure ◽  
Steam Parameters

The previous research of the application of sliding pressure has shown certain advantages in the operation of high-power condensing blocks with supercritical steam parameters in sliding pressure mode in comparison to the one with constant pressure. The maintenance of stable temperature regime and thermal expansion of turbine elements, prolongation of service life of materials of steam pipes and heating surfaces of the boiler due to the decrease in pressure of the working medium are only some of those advantages. On the other hand, the operation mode of a condensing block with sliding pressure is characterized by the change in cost-effectiveness. The result of this change is mainly due to the de-crease of steam throttling in the turbine's balancing valves and the increase of its internal action in a high pressure turbine, then also due to reduced steam consumption of the feed turbo pump just like a drop in the feed water pressure at the steam boiler inlet. A model has been developed within the framework of this study that follows such changes and their graphical interpretation is provided. The analysis results show that switching 300 MW blocks from the constant to the sliding pressure regime in the 30-60% load range increases the block efficiency respectively by 6.70-1.05%.

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