A coal-fired boiler is used to supply 18 000 kg/hr of steam at 12.5 bar with a drynessfraction of 0.97 to a dyehouse.Feedwater temperature is 105 °C with coal supplied at2 040 kg per hour to the combustion chamber. Assuming the calorific value of coal to be27.4 MJ / kg and the specific heat capacity of feedwater to be 4.18 kJ/kg K , determine:the heat rate in kJ/hrthe thermal efficiency of the boilerComplaints are received from the neighbourhood about the deposit of fly-ash andparticulate matter on houses and buildings.Discuss briefly ONE POSSIBLE cause of this problem referring to the boileroperation and maintenance.Suggest TWO ways of addressing the above problem.

We are to determine the heat transfer rate and thermal efficiency also a reason for flyash problem

Answered: the heat rate in kJ/hr the thermal…

the heat rate in kJ/hr the thermal efficiency of the boiler Complaints are received from the neighbourhood about the deposit of fly-ash and particulate matter on houses and buildings.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

A coal-fired boiler is used to supply 18 000 kg/hr of steam at 12.5 bar with a dryness
fraction of 0.97 to a dyehouse.
Feedwater temperature is 105 °C with coal supplied at
2 040 kg per hour to the combustion chamber. Assuming the calorific value of coal to be
27.4 MJ / kg and the specific heat capacity of feedwater to be 4.18 kJ/kg K , determine:
the heat rate in kJ/hr
the thermal efficiency of the boiler
Complaints are received from the neighbourhood about the deposit of fly-ash and
particulate matter on houses and buildings.
Discuss briefly ONE POSSIBLE cause of this problem referring to the boiler
operation and maintenance.
Suggest TWO ways of addressing the above problem.

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