What is the approximate thermal efficiency of a typical 1-ton coal-fired boiler How much coal and natural gas does it take to produce 1 ton of steam?

The approximate thermal efficiency of a 1-ton coal-fired boiler is about 78% to 85%, 200 kilograms of 4,500 calories per kilogram of coal and 80 cubic meters of natural gas.

Thermal efficiency: for a particular thermal energy conversion device, the ratio of its effective output of energy to the input of energy, is a dimensionless indicator, the general degree of expressed as a percentage.

The combustion of natural gas is an energy conversion process, can not be calculated by the thermal efficiency, but should be used to calculate the calorific value, the calorific value of combustion of natural gas per cubic meter for the answer to the 8,000 calories to 8,500 calories. Gas with internal appliances can be expressed in terms of thermal efficiency, such as gas water heaters, the national standard stipulates that the maximum allowable thermal efficiency should not be less than 98%, the minimum value should not be less than 82%.

Expanded Information:

p>Calculation of boiler thermal efficiency

Taking a 1-ton boiler as an example, the boiler produces 600,000 calories/hour and the calorific value of natural gas is 8600 calories/hour.

(1) 600,000 kcal/hour ÷ 8600 kcal/standard cubic meter ÷ 100% ≈ 69.76 standard cubic meters

That is, the boiler in the case of energy conversion of 100% thermal efficiency, the combustion engine burns 69.76 standard cubic meters of natural gas can produce 600,000 kcal/hour of heat, that is, to meet the operational requirements of 1-ton boiler.

(2) 600,000 kcal/hour ÷ 8600 kcal/standard cubic meter ÷ 92% ≈ 75.83 standard cubic meters

That is, the boiler in the case of 92% thermal efficiency of the energy conversion, the burner can produce 600,000 kcal/hour of natural gas combustion 75.83 standard cubic meters of heat to meet the operational requirements of the boiler of 1 ton.

Baidu Encyclopedia - Boiler Thermal Efficiency