diagnose process of ash slagging and fouling in pulverized coal fired boiler

  • typical causes of slagging and fouling problems in boilers

    Typical Causes of Slagging and Fouling Problems in Boilers

    The coal pulverizers are the heart of a pulverized coal–fueled boiler. About 75% of the opportunities for improvements in tuning are with the coal mills, primary airflow, and fuel line balancing.

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  • ash formation - slagging and fouling in boiler | comate

    Ash Formation - Slagging and Fouling in Boiler | CoMate

    This ash is generally not a hindrance to the boiler’s operation. However, a portion of this ash will adhere to the relatively cooler surfaces in various regions throughout the boiler. These ash deposits are influenced by many variables, such as the propensity of the ash to slag, the moisture content in the fuel, the temperature profiles

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  • slagging and fouling in coal fired boilers - bright hub

    Slagging and Fouling in Coal Fired Boilers - Bright Hub

    The sintered ash deposit in the convection region in boiler is called fouling. Coal fired boilers undergo outages when heavy deposition or slagging take place if proper action is not taken. Coal fired boilers experience deposition and slagging depending upon the …

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  • assessment of ash fouling and slagging in coal …

    ASSESSMENT OF ASH FOULING AND SLAGGING IN COAL …

    When coal is burned, a relatively small portion of the ash will cause deposition problems. Due to the differences in deposition mechanisms involved, two types of high temperature ash deposition have been defined as slagging and fouling [2]. Sootblowers are the primary means of dealing directly with furnace wall slagging and convection pass fouling. At present, the alternative of

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  • characteristics of ash deposits in a pulverized lignite

    Characteristics of Ash Deposits in a Pulverized Lignite

    In this paper, an intensive characterization of ash deposits collected from different positions of a pulverized-coal (PC) boiler has been conducted to diagnose the ash slagging and fouling issues within this boiler and to clarify the mass balance/flow of individual major elements and their role on ash slagging and fouling. A lab-scale drop-tube furnace has also been employed to elucidate the

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  • slagging and fouling in pulverized-coal-fired utility

    Slagging and fouling in pulverized-coal-fired utility

    @article{osti_5574412, title = {Slagging and fouling in pulverized-coal-fired utility boilers: Volume 2, A survey of boiler design practices for avoiding slagging and fouling: Final report}, author = {Barrett, R E}, abstractNote = {A survey was conducted of four utility boiler manufacturers to obtain nonproprietary information regarding criteria that they use for designing boilers to avoid

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  • inhibition of lignite ash slagging and fouling upon the

    Inhibition of lignite ash slagging and fouling upon the

    Apart from coal blending, the use of a fuel additive is another practical method to minimise ash slagging and fouling propensity in a boiler. The mineral additive acts as a capturer to mitigate fouling by capturing certain chemicals that have been linked to slagging and fouling, particularly alkali and alkaline earth metals , .To date, a variety of additives have been examined on different

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  • characteristics of ash deposits in a pulverized lignite

    Characteristics of Ash Deposits in a Pulverized Lignite

    In this paper, an intensive characterization of ash deposits collected from different positions of a pulverized-coal (PC) boiler has been conducted to diagnose the ash slagging and fouling issues within this boiler and to clarify the mass balance/flow of individual major elements and …

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  • a comprehensive slagging and fouling prediction tool for

    A comprehensive slagging and fouling prediction tool for

    Recently, much research has been put into finding the causes and solutions of slagging/fouling problems that occur at the end of the boiler. This slagging/fouling, caused by low-rank coal`s ash

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  • how to prevent slagging in a boiler furnace - bright hub

    How to Prevent Slagging in a Boiler Furnace - Bright Hub

    Check the chemical composition of the ash and work out the slagging propensity ratios. If it fits in a matrix of these ratios, then it can give an idea whether the coal being fired can slag in the boiler. Check the ash fusion temperatures starting from initial deformation temperature to fusion temperature.

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  • slagging and fouling evaluation of pc-fired boilers using

    Slagging and Fouling Evaluation of PC-Fired Boilers Using

    Abstract. SmartBurn® applied AshPro SM model to two 512 MW Tangential-fired (T-fired) boilers firing US western sub- bituminous coals to evaluate the boiler slagging behaviors with different operating conditions and OFA. The boiler convective pass fouling behaviors with three different coals were also evaluated. The slagging evaluation results indicate that the OFA configuration and air flow

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  • influence of coal quality and boiler operating conditions

    Influence of Coal Quality and Boiler Operating Conditions

    Ash fusion tempe rature tests have been around for almost a century. At first there was just one, then three, and finally we know have four reported fusion temperatures. Designed for stoker furnaces Many deficiencies when used for evaluation of slagging or fouling deposits in pulverized coal furnaces. The fact that the test can be run

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  • pulverised coal - an overview | sciencedirect topics

    Pulverised Coal - an overview | ScienceDirect Topics

    A coal-fired thermal power station is a power plant in which the prime mover is steam driven. Water is heated, turns into steam, and spins a steam turbine, which drives an electrical generator, as schematically shown in Fig. 1.9.After it passes through the turbine (one to three stage), the steam is condensed in a condenser and recycled to where it was heated; this is known as a Rankine cycle.

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  • an overview of problems and solutions for components

    An overview of problems and solutions for components

    Dec 21, 2017 · There are some ash actions prediction tools such as AshProSM used to review the slagging and fouling situation in coal-fired boilers. Integrated boiler with computational fluid dynamic (CFD) simulations with ash actions models is used to determine ash development, transport, deposition, deposit growth and strength development [ 36 ].

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  • control of ash deposition in pulverized coal fired boiler

    Control of ash deposition in pulverized coal fired boiler

    Some of the ash generated through the combustion process of solid fuels, such as pulverized coal, adheres to the tube surface during heat exchange. This causes problems of heat transfer inhibition

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  • coal-fired utility boilers: solving ash deposition

    COAL-FIRED UTILITY BOILERS: SOLVING ASH DEPOSITION

    Apr 01, 2001 · The accumulation of slagging and fouling ash deposits in utility boilers has been a source of aggravation for coal-fired boiler operators for over a century. Many new developments in analytical, modeling, and combustion testing methods in the past 20 years have made it possible to identify root causes of ash deposition.

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  • analysis of fouling degree of individual heating surfaces

    Analysis of Fouling Degree of Individual Heating Surfaces

    The paper presents the method of fouling degree evaluation of the heating surfaces in pulverized coal-fired boiler during coal combustion and biomass co-combustion. The fouling processes have a negative impact on the boiler operation by reducing the steam outlet temperature, increasing the mass flow rate of cooling spray water, and may be the

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  • the influence of ashing temperature on ash fouling and

    The influence of ashing temperature on ash fouling and

    Hence, in this study, the slagging and fouling tendency of biomass ash was evaluated according to the empirical indices for predicting the coal ash behavior during coal combustion. Analysis of the data in Table 3 showed that the vaporization of alkali metals (mainly including potassium and sodium) can be increased by increasing ashing temperature.

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  • coal pulverizer maintenance improves boiler combustion

    Coal Pulverizer Maintenance Improves Boiler Combustion

    One 450-MW coal-fired unit in the Midwest spent $750,000 on testing, changes, and tuning, but calculated that it saved millions by improving heat rate and by allowing higher-slagging fuel to be

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