Operation Adjustment of Yima Coal-Fired Circulating Fluidized Bed Boiler
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The good effect was achieved,when the DG 440/13.7-112 type circulating fluidized bed(CFB)boiler burned Yima low grade coal.The paper briefs the combustion features and existing problems in the operation process of CFB boiler while burning Yima coal,as well as the optimization method in the actual operation process,for example,to raise the standard of vibrating screen,add the starting bed material,raise the bed pressure,control the bed temperature,slag disposal,and primary and secondary air quantity etc.Keywords:
Fluidized bed combustion
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The use of thermal energy formula,from the unit steam temperature,steam pressure,vacuum and various indicators such as parameters and operation mode to analyze the first Taiwan-made 690t / h circulating fluidized bed boiler unit has been put into operation in the factors affecting coal,Shenhua Yili plant would use this analysis when the unit overhaul to make targeted arrangements,unit coal consumption greatly reduced;for the northern alpine region of the fluidized bed technology,the use of air-cooled units provide a reference method of economic operation.
Steam pressure
Fluidized bed combustion
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Through improving the equipments and exploring the operation characteristics,some experience on one HG670/13.7-L.PM19 CFB boiler was gained since commercial running.In order to strengthen the safe characteristics,thirty operation conditions were measured with the optimization regression method.Moreover,the paper analyzed the boiler load,ash,volatiles,low calorific value of coal,coal granularity,bed pressure,the ratio of primary air,the ratio of the up secondary air,the ratio of the down secondary air,Oxygen quantity.
Heat of combustion
Granularity
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Two kinds of boiler is compared from structure through operation,acceptabilily for fuels,enviromental protection and so on.The result showes obviously that circulating fluidized bed boiler is better than powdered coal boiler.
Fluidized bed combustion
Pulverized coal-fired boiler
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Taking the boilers of Shanxi Pingshuo Coal-gangue Power Generation Co.,Ltd as the example,this paper discusses in detail the causes of and solutions about the over-temperature of CFB(circulating fluidized bed)boiler’s bed temperature and cyclone separator’s outlet temperature caused?by the change of coal quality.
Fluidized bed combustion
Cyclonic separation
Separator (oil production)
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The new slag cooling system for circulating fluidized bed boiler realizes effective cooling and heat reutilization of ash and slag in fluidized bed boiler, which guarantees the stability of boiler combustion and the reliability of unit operation.
Fluidized bed combustion
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CFB boiler burning is a complex process which influenced by variety of factors,it carried on the boiler thermal efficiency test in three coals and changed conditions of different loads by SG-475/13.9-M567 CFB boilers,and concluded that load and coal was the main factors which influence thermal efficiency of circulating fluidized bed boiler,while excess air coefficient,the primary air rate,bed pressure,bed temperature and other operating parameters was adjustable within a certain range for the CFB boiler thermal efficiency,then be able to guide plant load distribution,and coal deployment,combustion adjustment of CFB boiler,in order to obtain a good economy,and to provide a reference to other CFB boiler operation.
Fluidized bed combustion
Pulverized coal-fired boiler
Thermal efficiency
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The influence of furnace bed pressure drop on the performance of circulating fluidized bed coal-fired boiler was analyzed,and the design theory and method were proposed for the energy saving circulating fluidized bed boiler with low bed pressure drop on the basis of fluidization reconstruction.A complete set of design guide for the energy saving circulating fluidized bed boiler was formed,and the product structural design of the energy saving circulating fluidized bed boiler was completed.The first set of 75 t/h product with low energy consumption has been in operation in Shanxi Lishi Datuhe Cogeneration Power Plant for 2 years.The operational results and test data indicate that,the optimum combustion efficiency of the energy saving circulating fluidized bed boiler can be obtained under the condition with optimum bed pressure drop.At the same time,the abrasion of the heating surface and energy consumption of the fans can be decreased to the maximum extent.
Fluidized bed combustion
Fluidization
Cogeneration
Energy Recovery
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From the view point of circulating material balancing,the paper analyzed the high bed temperature problem of a 440 t/h circulating fluidized bed boiler made by Harbin Boiler works in terms of the startup bed material selection,coal quality,the slag-cooling equipment selection,boiler startup time and the capability of recirculation valve,etc.It put forward the corresponding countermeasures and acquired satisfactory result.
Fluidized bed combustion
Boiler blowdown
Countermeasure
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A novel method for predicting the dynamic combustion performances of densephase zone in CFB furnace are proposed based on the improvements on the previous models. The coal particle heating process, the time delay and the subsequent heat release as raw coal with wide size distribution admitted into the furnace are adequately taken into account in the proposed model. The bed temperature responses to the variations of coal firing rates are predicted and compared to the measured data from a 220t/h CFB boiler.
Fluidized bed combustion
Pulverized coal-fired boiler
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The operation performance of circulating fluidized bed combustion (CFBC) boiler was studied in this paper. The experimental results indicate that the load of CFB boiler has linear relation with bed temperature and bed material height of operation. By multiple regression analysis, the relation of the load of CFB boiler with bed temperature and bed material height of operation can be expressed as a formula. The suitable temperature and the bed material height corresponding to the load of CFB boiler can be found using the formula; the problem of the boiler to be blindly operated can be reduced in practice.
Fluidized bed combustion
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