Course detail

Fuel Economy

FSI-LPHAcad. year: 2023/2024

The course deals with the main characteristics of fossil fuels and their influence on the design and operation of boilers. The main part of lectures gives information about the preparation of coal for pulverized combustion, pulverizers and their construction, operation and safety. The final part deals with coal burners.

Language of instruction

Czech

Number of ECTS credits

5

Guarantor

doc. Ing. Zdeněk Skála, CSc.

Department

Energy Institute (EÚ)

Entry knowledge

Sources and transformation of energy, boilers basics.

Rules for evaluation and completion of the course

Course-unit credit requirements: - Attendance at seminars - handing in notes from seminar calculations – working out a project.
The exam is written and oral.
Attendance at seminars is required, compensation of missed lessons to be negotiated with a teacher.

Aims

The course objective is to make students familiar with fossil fuels and their attributes. The emphasis is put on basic energy resource of the Czech Republic, which is coal. The course also provides with basic theoretical and calculation particulars for the design of milling stations.
This course enables students to design milling stations or control operation of more complicated milling circuits. Fuel manipulation in big power plants will be also introduced to students.

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Černý V., Janeba B., Teysler J.,: Parní kotle, Technický průvodce č. 32, SNTL, Praha, 1983
Atkins P.W.,: Physical Chemistry, Oxford Oxford University Press 1994
Singer J.G.,: Combustion, Fossil Power Systems: A Reference Book on Fuel Burning, Combustion Engineering Power Systems Group; 4th edition (October 1993)

Recommended reading

Skála Z.,: Palivové hospodářství, Brno VUT 1987
J. Teyssler:Spalování popelnatých hnědých uhlí,SNTL Praha
P.Basu,C.Kefa,L.Jestin: Boilers and Burners,Design and Theory, Springer-verlag,New York

Type of course unit

 

Lecture

26 hours, optionally

Teacher / Lecturer

doc. Ing. Zdeněk Skála, CSc.

Syllabus

1. Fossil fuels, classification and characteristic attributes of solid fuels.
2. Impact of fuel properties on boiler construction. Liquid fuels, attributes, manipulation, storage.
3. Gaseous fuels, properties, interchangeability of gases, Wobbe index.
4. Combustion quality control, combustion kinetics.
5. Inner and outer coaling, dump sites, transfer of coal, graining.
6. Milling circles, types, usage according to coal type.
7. Drying of coal, drying medium, milling station innertisation, waste vapour re-circulation.
8. Energetic rules for mechanical disconnecting of coal. Grindability, specific grind work, attributes of coal powder.
9. Tube mill, construction, operation and usage.
10. Middle-running mills, construction, operation and usage.
11. Hammer and impact mills, construction, operation and usage.
12. Supplementary devices of mill stations, powder bins, feeders.
13. Collective combustion of coal and biomass.

Computer-assisted exercise

13 hours, compulsory

Teacher / Lecturer

doc. Ing. Zdeněk Skála, CSc.

Syllabus

1. – 2. Fuel composition calculations, stoichiometric calculations with combustion air, power design of air fan.
3. – 4. Stoichiometric flue gas calculations, flue gas concentration calculations, uncooled flame temperature, flue gas dissociation.
5. – 6. The mill circle in a coal-fired boiler. Thermal balance, power calculation, operating conditions.
7. – 8. The mill circle in a lignite-fired boiler. Thermal balance.
9. – 10. The mill circle in a lignite-fired boiler. Power calculation, operating conditions.
11. – 12. Design of crude fuel tank; transport of fuel to the boiler.
13. Credit