"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware

Description

"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware

learning target

1. Understand the types of fuels.

2. Know that during the combustion process, the chemical energy of the fuel is converted into internal energy.

3. Know what the combustion value of fuel is and its units.

4. Be able to look up the calorific value table and know the physical meaning of the calorific value of a certain fuel.

5. Know how to use fuel effectively and understand the efficiency of the boiler.

1. Types of fuel

Solid fuel: wood, coal...

Liquid fuel: gasoline, diesel...

Gas fuel: hydrogen, coal gas, natural gas...

2. Energy conversion during combustion

Combustion is a chemical change - the production of chemical energy

Combustion is the conversion of chemical energy into internal energy

3. Calorific value

think

Do coal and charcoal of the same mass release the same amount of heat?

A family of three needs a certain amount of internal energy, that is, absorbed heat, for a month, and these heats are released by burning fuel. Firewood requires 150 kilograms, coal only 75 kilograms, and liquefied gas only 30 kilograms. In a sense, firewood is inferior to coal, and coal is inferior to liquefied gas.

Question: How to distinguish the difference between fuels?

4. Effective utilization of fuel

The most important application of internal energy is directly used for heating, which is essentially the transfer of internal energy;

Another important application of internal energy is to use it to do work, which is essentially the transformation of internal energy;

think

Is the heat released when the fuel is burned fully utilized?

5. Boiler efficiency

1. Definition:

The ratio of the heat effectively utilized by the boiler to the heat released by complete combustion of the fuel is called the efficiency of the boiler.

2. Methods to improve boiler efficiency

(1) Make combustion as complete as possible, such as grinding coal into powder and blowing it into the furnace with a blower.

(2) Reduce heat loss, such as increasing the heating area and reducing the heat taken away by the flue gas.

Summary of this lesson

What did you learn from this lesson?

1. Types of fuel

Solid, liquid, gaseous fuels

2. Energy conversion during combustion

Combustion is the conversion of chemical energy into internal energy

3. Calorific value

The amount of chemical energy converted into internal energy when 1kg of a certain fuel is completely burned is called the calorific value of the fuel.

Practice in class

1. The calorific value of alcohol is 3.0�107 J/kg. The heat released when 200g of alcohol is completely burned is _______J. To obtain 5.4�106J of heat, at least _______g of alcohol must be completely burned.

2. Coal prices have been rising recently. Many unscrupulous traders have broken up coal gangue and sold it in high-quality coal. If you are an inspector, the most appropriate method is to detect ( ) of the following physical quantities

A. Specific heat capacity B. Temperature

C. Calorific value D. Quality

3 * Regarding the calorific value of fuel, which of the following statements is correct ( )

A. It has nothing to do with the combustion condition of the fuel.

B. Fuel that burns easily must have a high calorific value.

C. The heat released when 1kg of coal is burned must be greater than the heat released when 1kg of firewood is burned.

D. One cup of alcohol has a higher caloric value than half a cup of alcohol.

4. Fill in "> = <"

Calorific value of 0.2 kg gasoline_____ Calorific value of 20 kg gasoline;

The calorific value of 0.1 kg gasoline _____ the calorific value of 10 kg alcohol;

The amount of heat produced by the complete combustion of 14 kg of gasoline______

The amount of heat produced by the complete combustion of 10 kg of hydrogen.

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For more information about the PPT courseware "Mechanical Energy Internal Energy and Its Conversion into Fuel Utilization and Environmental Protection", please click the Mechanical Energy Internal Energy and Its Conversion PPT Fuel Utilization and Environmental Protection PPT tag.

"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware 5:

"Utilization of Fuels and Environmental Protection" Mechanical Energy, Internal Energy and Their Conversion PPT Courseware 5 Project Main Content Types of Fuels Fuels can be divided into three categories: ______, ______ and ______. Calorific value 1 kg of a certain fuel ______ time The amount of ______ energy that can be converted into ______ (put...

"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware 4:

"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware 4 Teaching objectives 1. Know the calorific value of fuel and its calculation 2. Understand what is the efficiency of heat engines and the main ways to improve heat engine efficiency 3. Know the boiler and the environment Protecting the relationship between fuel and its heat..

"Fuel Utilization and Environmental Protection" Mechanical energy, internal energy and their conversion PPT courseware 3:

"Fuel Utilization and Environmental Protection" Mechanical Energy, Internal Energy and Their Transformation PPT Courseware 3 Topic Background Internal energy is the largest amount of energy used by humans, and the main way to obtain internal energy currently is the combustion of fuel. Therefore, it is necessary for us to learn about fuel. ..

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Update Time: 2024-06-30

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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