The PLC Research in the Program Control System of Thermal Power Coal Handling

2012 ◽  
Vol 548 ◽  
pp. 812-816
Author(s):  
Xiao Min Chen ◽  
Xi Yan Liu
Keyword(s):  
Power Plants ◽  
Rapid Development ◽  
Thermal Power ◽  
Chinese Economy ◽  
Power Requirement ◽  
Handling System ◽  
Human Power ◽  
Material Resources ◽  
Electricity System

With the rapid development of Chinese economy, the thermal power requirement is increasing not only in industry but also for the civil use in recent years. In China, the main fuel of thermal power is coal. Coal handling system places the consequence in the whole generate electricity system and has significant meaning to the power plant operation. The coal handling system of the thermal power plants has many types of equipment. The environment is vile with complicated control. If we control this system through manual mode, there will appear the imponderable questions. This article through the research of the coal handling system by the management of PLC can determine the long-term safe operation and reduce a mass of human power and material resources. It has the fundamental practical meaning and research value.

scholarly journals Prospects of using new technologies in Russia’s electric power industry to comply with international commitments to reduce CO2 emissions

2018 ◽  
Vol 58 ◽  
pp. 03007
Author(s):  
Alexey Tchemezov ◽  
Elena Chemezova ◽  
Anton Syromyatnikov
Keyword(s):  
Electric Power ◽  
Power Plants ◽  
New Technologies ◽  
Thermal Power ◽  
Electric Power Industry ◽  
Power Industry ◽  
International Commitments ◽  
Russian Region ◽  
Emission Of Greenhouse Gases

This study addresses the methodology of projecting the electric power industry developments, taking into account environmental constraints. I obtained quantitative assessments of long-term electric power industry development in a Russian region, determined the emission of greenhouse gases from fuel combustion at thermal power plants (TPPs), and the efficiency of technologies to reduce greenhouse gas emissions in the electric power industry.

scholarly journals Influence of the Size of Coal Ash FAU Zeolites Used as Dopants on the Sensing Properties of Nb2O5 Thin Films

2020 ◽  
Vol 2 (1) ◽  
pp. 3
Author(s):  
Katerina Lazarova ◽  
Silviya Boycheva ◽  
Marina Vasileva ◽  
Denitza Zgureva ◽  
Tsvetanka Babeva
Keyword(s):  
Thin Films ◽  
Power Plants ◽  
Thermal Power ◽  
Coal Ash ◽  
Reflectance Spectra ◽  
Sensing Properties ◽  
Volatile Organic ◽  
Coating Method ◽  
Reflectance Measurements

In this study, solid waste from coal combustion in thermal power plants (TPPs) was used for the synthesis of zeolite Na-X samples. They were prepared by the long-term alkaline atmospheric conversion of coal ash collected from the electrostatic precipitators in the TPP “AES Galabovo”. When used in the form of thin films/layers, the optical detection of volatile organic compounds (VOCs) is possible due to a change in their reflectance spectra and color. In order to improve the sensing properties of synthesized zeolites, they were wet milled for 60 s and both milled and unmilled zeolites were used as dopants for the niobium oxide matrix in the form of thin films deposited by the spin-coating method on a silicon substrate. The surface morphology and structure of both zeolite powders were studied by scanning electron microscopy, while their size was determined by dynamic light scattering (DLS) spectra. Optical constants (refractive index, n, and extinction coefficient, k) and the thickness of the films were calculated from reflectance measurements. The change in the reflection coefficient ∆R of the films was determined from measured reflectance spectra prior to and after exposure to probe acetone molecules. An increase in the reaction of the films with milled zeolites to acetone, compared to the samples with unmilled zeolites, is demonstrated.

Long Term Creep Rupture Strength of 9Cr1MoNbV Narrow Gap Welded Joints Improved by Normalizing and Tempering After Welding

2007 ◽  
Author(s):  
Takashi Sato ◽  
Kohji Tamura ◽  
Koichi Mitsuhata ◽  
Ryuichi Ikura
Keyword(s):  
Welded Joints ◽  
Power Plants ◽  
Rupture Strength ◽  
Thermal Power ◽  
High Strength ◽  
Creep Rupture ◽  
Narrow Gap ◽  
Parent Metal ◽  
Welding Procedure

With the increase of steam parameters of coal-fired thermal power plants, high strength 9%Cr steel containing niobium and vanadium became major material in high temperature boiler components. As the microstructure of these steels is tempered martensite, it is known that the softening occurs in HAZ of the weldment. In the creep rupture test of these welded joints the rupture strength is lower than that of the parent metal, and sometimes this reduction of strength is caused by Type IV cracking. To develop an effective method to improve the rupture strength of welded joints, a normalizing-tempering heat treatment after weld was proposed. 9Cr1MoNbV plates with a thickness of 40–50 mm were welded by 10 mm width automatic narrow gap MAG welding procedure using specially modified welding material. After normalizing at 1050C and tempering at 780C, material properties of the welded joints were examined. Microstructure of the HAZ was improved as before weld, and rupture strength of the welded joints was equal to that of the parent metal. The long term rupture strength of the welded joints as confirmed in the test exceeded 30,000 hours. This welding procedure has been applied to the seam weld of boiler hot reheat piping in USC plants successfully.

Findings on Creep-Fatigue Damage in Pressure Parts of Long-Term Service-Exposed Thermal Power Plants

1985 ◽  
Vol 107 (3) ◽  
pp. 260-270 ◽  
Author(s):  
F. Masuyama ◽  
K. Setoguchi ◽  
H. Haneda ◽  
F. Nanjo
Keyword(s):  
Fatigue Damage ◽  
Power Plants ◽  
Thermal Power ◽  
Field Experiences ◽  
Creep Damage ◽  
Thermal Power Plants ◽  
Damage Analysis ◽  
Creep Fatigue ◽  
Fatigue Damage Analysis

The increase of long-term service exposure to thermal power plants, the tendency toward intermediate and cyclic operation to meet the change in electric power demand and supply situation, and the requirement to develop higher-temperature and higher-pressure plants have led to increasing attention towards the reliability improvement. This paper presents findings from field experiences of cracking or failure and two types of damage analyses—(1) creep-fatigue damage analysis based on the life fraction rule and (2) metallurgical damage analysis—of boiler pressure parts that have been exposed to long-term elevated temperature service. The field experiences are (1) cracking or failure of thick-walled Type 316 stainless steel pressure parts in the main steam line of an ultra-supercritical thermal power plant and (2) dissimilar metal weld joints for boiler tubing. The creep-fatigue damage analysis of these pressure parts showed a reasonable correspondence with the field experience. According to the creep-fatigue damage analysis and the metallurgical damage analysis, most of damage was restrained creep mode phenomenon without deformation. The creep damage was composed of metallurgical damage and mechanical damage such as microvoids and structural defects. One method of simulating field experienced creep damage was proposed and performed. As a result, the process of creep voids being generated and growing into cracks without deformation was successfully observed. Also a review of the current status of nondestructive detecting methods of creep damage suggests that detecting the creep voids metallurgically is more practical at the present time than doing so analyzing the changes in physical properties of the material. It is also suggested that, in the metallurgical approach, detecting the creep voids and cracks by replica method and anlayzing precipitates for evaluation of material deterioration by precipitate extraction method will make it possible to successfully address the problem of plant equipment creep damage evaluation and life prediction.

India’s energy demands will keep coal fires burning

2017 ◽  
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Liquefied Natural Gas ◽  
Short Term ◽  
Indian Government ◽  
Content Type ◽  
Energy Demands ◽  
Coal Fires ◽  
Vehicle Fleet

Subject India's short-term need for coal despite long-term plan for renewables. Significance Reports indicate that NTPC, the former National Thermal Power Corporation, India’s largest state-run electricity producer, is planning to invest 10 billion dollars over a five-year period in three new coal-fired power plants. The proposal is striking in the light of India’s commitment to renewable energy and its stance on climate change. Impacts India’s plans to shift its vehicle fleet to electricity by 2030 may bring increased coal use in the long term. The Indian government may face a backlash from the urban electorate if it fails to curb air pollution from coal burning. Liquefied natural gas imports may increase in the short term if underused gas-fired power plants are brought online.

Studying the Metal from Drums at Thermal Power Plants after Long-Term Operation Using Subsize Charpy Specimens

2021 ◽  
Vol 68 (8) ◽  
pp. 640-646
Author(s):  
A. G. Rudenko ◽  
V. N. Voyevodin ◽  
S. V. Gozhenko ◽  
P. A. Mischenko
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Term Operation

scholarly journals Dysprosium Oxide-Supported CaO for Thermochemical Energy Storage

2021 ◽  
Vol 8 ◽  
Author(s):  
Larissa Fedunik-Hofman ◽  
Alicia Bayon ◽  
Xiang Gao ◽  
Antonio Tricoli ◽  
Scott W. Donne
Keyword(s):  
Energy Storage ◽  
Power Plants ◽  
Thermal Power ◽  
High Surface ◽  
High Surface Area ◽  
Dysprosium Oxide ◽  
Novel Material ◽  
Improved Performance ◽  
Operational Expenditure

A novel CaO-based material supported with Ca3Al2O6 and Dy2O3 was found to show excellent performance as a thermochemical energy storage material for use in solar thermal power plants. It retains a carbonation conversion capacity of 82.7% for a period of 40 cycles, as well as exothermic heats of reaction of 582.2 kJ kg−1, up to seven times greater than other materials found in the literature. The improved performance was attributed to the greater prevention of sintering and retention of high surface area by the addition of two inert supports: Ca3Al2O6 and Dy2O3. Long-term effectiveness of the novel material was also evaluated by using a sintering model. It retains an energy storage utilization of 6.2 kg kWh−1 after 30 years of cycling, while commercial limestone would require 81 tons kWh−1 equivalent. Limestone requires replacement every six thermal cycles, making it impractical for real thermochemical energy storage implementation. The extra cost associated with the addition of supports in this CaO-based material is justified by the long-term durability, which would imply a reduction in the overall capital and operational expenditure of the plant.

Reliability of steam pipelines of thermal power plants in the course of long-term operation

2006 ◽  
Vol 42 (4) ◽  
pp. 461-465 ◽  
Author(s):  
O. I. Balyts’kyi ◽  
I. V. Ripei ◽  
Kh. A. Protsakh
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Term Operation
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