Question

СРОЧНО ОДНА ЗАДАЧА 50 БАЛЛОВ Теплова електростанція потужністю 2400 МВт споживає 1500 т вугілля за годину. Який ККД станції? Питома теплота згоряння вугілля 2.7*10 в седьмой Дж\кг

Answer 1

Ответ:кпд=A/Q=N*t/q*m=2400*10^6*3600/29*10^6*1500*10^3=0,199=19,9%

Объяснение:

Answer 2

Calculating the Efficiency of the Power Plant

To calculate the efficiency of the power plant, we can use the formula for thermal efficiency:

Thermal Efficiency = (Useful output energy / Input energy) * 100%

In this case, the useful output energy is the electrical power generated by the power plant, and the input energy is the energy contained in the coal consumed.

Calculating Input Energy from Coal Consumption

The input energy can be calculated using the formula:

Input Energy = Mass of coal * Specific heat of combustion of coal

Given: - Mass of coal = 1500 tons per hour - Specific heat of combustion of coal = 2.7 * 10^7 J/kg

We need to convert the mass of coal from tons to kilograms to match the units in the specific heat of combustion.

1500 tons/hour = 1500 * 1000 kg/hour = 1,500,000 kg/hour

Calculating Useful Output Energy

The useful output energy is the electrical power generated by the power plant. The power generated can be calculated using the formula:

Power = Energy / Time

Given: - Power of the power plant = 2400 MW (megawatts) - Time = 1 hour

Converting the power from megawatts to watts: 2400 MW = 2400 * 10^6 W

Calculating Efficiency

Now that we have the input energy and the useful output energy, we can calculate the efficiency using the thermal efficiency formula mentioned earlier.

Let's calculate the efficiency using the provided data.

Efficiency Calculation

Input Energy = Mass of coal * Specific heat of combustion of coal Input Energy = 1,500,000 kg/hour * 2.7 * 10^7 J/kg

Useful Output Energy = Power of the power plant * Time Useful Output Energy = 2400 * 10^6 W * 1 hour

Now, we can use the thermal efficiency formula to calculate the efficiency of the power plant.

Thermal Efficiency = (Useful output energy / Input energy) * 100%

I will now calculate the efficiency using the provided data.