   
 


  ,   ,   ,       ,  .          .            ,    .  ,       ,   ,        .





   



 



 ,2020



ISBN978-5-0051-1877-6

     Ridero






        ()   (19232017).       .







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Coal Flow and stagnancyinPower Station bunkers


BlechmanM.E., Engineer.





Abstract


Existing theories on the flow ofcoal as bulk material inbunkers are based on observations ofmodels and shear tests ofthe fuel under laboratory conditions. While burning highly moist and coalescent coals such observations and measurements do not correspond tothe conditions existing inreal bunkers.

This book presents the results ofobservations ofthe flow and stagnancy ofcoal, as aunified process, inreal bunkers at more than 23power stations. The goal ofthe investigation was tostudy ofprocesses occurring inthe bunkers with the purpose ofdeveloping effective measures for solving problems ofstagnancy on the walls and the arching offuel inthe outlets ofthe bunkers.

The program included: collection ofdata on changes inthe moisture content ofthe coal during different seasons ofthe year; observations offuel evacuation; determining the stagnancy zones and their sizes for various levels ofmoisture content ofthe fuel; recording and analyzing the processes that occur inthe bunker.

Method: measurement ofthe configuration ofthe fuel level inthe bunkers during its evacuation; measurement ofthe rate ofdecrease infuel levels and the flow velocity inthe flow zone ofcoal; calculation ofthe main flow diameters from the measured fuel velocity and flow rate; determination ofthe effective volume ofthe bunker; calculation ofthe initial resistance toshear ?0 based on measurements inreal bunkers.

Results:

1. Agrading offuels byflowability is proposed.

2. Arelationship was found between fuel flowability and the following processes:

a. Variations inthe velocity and diameter ofthe coal flow along the depth ofthe bunker.

b. The stage at which contiguous flows and mass flow form.

c. The presence ofasecond bunker.

d. The presence ofinternal shear.

e. The conditions causing the fuel tocavein.

f. The formation ofastagnant zone.

3. For each flowability class, we determined:

a. The variation inthe angle ofslip ofcoal on coal along the depth ofthe bunker.

b. Coal flow forms for earth group ofcoal flowability..

c. The effectiveness ofvarious methods for improving the operation ofthe bunkers.

d. The required measures for improving the operation ofthe bunkers as afunction ofthe fuel flowability.







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