Cal:
The amount of heat required to raise the temperature of one gram of pure water from ℃ to ℃ under standard atmospheric pressure. Standard coal: A fuel having a low calorific value equal to (7000Kcal) is called 1 kilogram of standard coal. Conversion relationship: 1 kg of standard coal = 7,000 Kcal = conversion of standard coal and standard oil: standard coal = standard oil × energy conversion coefficient: the value of the unit weight or volume of fuel converted to standard coal. For example: 1 m3 of coke oven gas has a calorific value of 4,500 kcal, which is equivalent to standard coal: 4,500 kcal/m3 ÷ 7,000 kcal/kg of standard coal = standard coal/m3 The energy consumed by the heat transfer fluid produced per unit of weight or volume. is equivalent to the value of standard coal. For example: producing 1 km3 of blast furnace requires 75 kWh of electricity. The electricity conversion factorElectricity is standard coal/kwh. The conversion factor for the blast furnace is then: 75 kWh/km3 × standard coal/kwh = 24 kg of standard coal/km3 of superheated steam. , pressure 150 kilograms per square centimeter, thermal enthalpy per kilogram: below 200℃, it is calculated as 650 kcal, 220℃-260℃ is calculated as 680 kcal, 280℃-320℃ is calculated as 700 kcal, 350℃ -500 ℃ is calculated as 700 kcal. Convert joules to joules. Saturated steam, pressure kg/cm2, enthalpy above 127℃ is 620 kcal, pressure 3-7kg/cm2, temperature 135℃-165℃ is 630 kcal. The pressure is 8 kg/cm² and the temperature is above 170°C. Each kilogram of steam is equivalent to 640 kcal. Calculated based on the electricity production of a standard ton of coal. The low calorific value of standard coal is 7,000 kcal/kg. The thermal efficiency of the boiler is 80%. The boiler feed water is calculated at 42 degrees, the production of boiler steam is calculated at 450 degrees and the steam consumption rate of the steam turbine is calculated according to the formula 1000*7000**80%/i.e. the electricity production calculated for A standard ton of coal is 1,550 kW, which is equivalent to 640 g of standard coal per kilowatt hour.
How much heat does it take to raise the temperature of a ton of water by 30 degrees? How many kilograms of diesel fuel do you need? How many cubic meters of natural gas? How many kilograms of coal do you need? What is the value advantage of each?
Formula for calculating gangue content:
The mass percentage of gangue in coal with a grain size greater than 50MM. Coal gangue content refers to the percentage of gangue with a particle size greater than 50 mm relative to the total coal. Generally, the gangue content of raw coal andcommercial coal (including commercial raw coal) must be measured.
The gangue content of raw coal is an important indicator to check whether the level of coal face management, mining methods and technical measures are reasonable. For commercial coal, gangue content can only be measured when the upper limit of particle size exceeds 50 mm. However, in special circumstances, the gangue content of commercial coal (such as medium-block anthracite used as a raw material for ammonia synthesis). can also be measured for commercial coal with particle size less than 50 mm.
Conceptual analysis
The low calorific value of standard coal is 7,000 kcal/kg. The thermal efficiency of the boiler is 80%. Boiler feed water is calculated at 42 degrees and boiler steam production is calculatedat 3.82 MPa/At 450 degrees, the steam consumption rate of the turbine is 4.8.
The calculation formula is 1000*7000*4.1868*80%/(3333.47-175.8456)/4.8=1549.586995kw, that is to say the Electricity output from one ton of standard coal is 1550kw, which is equivalent to 640 g of standard coal per kilowatt hour.
This is a common math question. I'll give you some evaluated data and you can do the math yourself. The first and second level know that users only know how to ask questions and close questions when they have the answers. They even forget to ask the questions themselves! I have encountered this too many times and now I am heartbroken. But since you come to Baidu to ask questions and don't give you an answer, you will say that Baidu really has no one... Okay, without further ado, here is the data: At atmospheric pressure, when one gram of water increases by one degree Celsius, it absorbs heat from a thermodynamic cal; your water is one ton, or a thousand kilograms; the calorific value of natural gas is 35,000 KJ/m3, and 1 kcal is equal to 4.82 kilojoules; standard coal is 7,000 kcal/kg; the calorific value of diesel is 44,000 KJ/Kg. Here's all the data you need...