This is related to the power plant settings. Coal consumption here refers to the standard coal consumption rate, which is around 360-450. Actual coal consumption is higher because the calorific value is lower than that of standard coal.
As for water, it is difficult to know the average consumption rate for electricity production. It is linked to the operation of the unit. Additionally, boiler water is consumed. must be replaced regularly. It does not require power plants in rivers and lakes. Condensed water should also be consumed.
The efficiency of power plants is generally less than 40%. This is determined by the second law of thermodynamics. High quality coal will not improve efficiency. The main factors that determine the efficiency of power plants are the main ones. Steam Settings and Steam Settingsspent steam. The main steam parameters are determined by the pressure and temperature resistance conditions of the metal, the maximum is above 600 degrees, 26 MPa. The combustion temperature of coal is much higher than that, so it won't. be limited by the type of coal. Exhaust steam parameters are determined by atmospheric temperature or water temperature and are difficult to change.
Although high-quality coal has high calorific value and low volatile matter content, it is difficult to ignite and is expensive, so it is generally not used in power plants electrical. Power plants burn relatively lean fuels, including oil shale. and sugar cane slag and the like.
How many kilowatt hours of electricity is equivalent to 1 standard ton of coal?
m3/(s·GW) is equivalent tocubic meters per gigawatt second. This is cubic meters per million kilowatt seconds, that is, how many cubic meters of water are consumed per second to produce gigawatts (million kilowatts) of electricity.
During the operation of thermal power plants, in addition to consuming primary energy and emitting pollution, they also consume a large amount of water resources. The water consumption indicator has become one of the most important economic evaluation indicators. thermal power plants. Fresh water resources are needed to meet urban development, irrigation of agricultural lands, etc. The dependence of thermal power plants on water resources poses a huge burden to areas deprived of water resources.
Detailed information
The technology of cooling the exhaust air of steam turbines of thermal power plants has beenwidely used in water-poor areas of northern China. The steam turbine generator. Main engine exhaust is adopted. After air cooling system, compared with wet cooling unit with circulating water supply, the whole plant can save about 80% water. The current installed capacity of air-cooled units represents approximately 14% of the total installed thermal power capacity. Compared with conventional secondary cycle wet-cooled units, they can save about 1.2 billion tons of water resources every year.
After the host adopts air cooling technology, the operating back pressure increases and the coal consumption for power supply increases significantly. At the same time, the investment in air cooling system is higher than that of chiller unitsconventional wet conditions. For a 2 × 600 MW unit, the investment is about 200 to 300 million yuan higher. In addition, air cooling technology also has problems such as poor vacuum sealing of the system, serious dirt on the outer surface of the air-cooled condenser, and high dissolved oxygen content in the condensed water of the system. air cooling. The current development trend of air cooling technology for coal-fired power generation units is mainly to improve the economics of air cooling units and reduce coal consumption.
Baidu Encyclopedia - Thermal Power Plant
At approximately 3,000 degrees, the thermal energy generated by burning a ton of coal reaches 3*10 ^ 10Joulesof. Depending on the efficiency, generally 60% of the thermal energy will be lost, which meanse that it is effectively converted into 40% of thermal energy. According to calculations, a ton of coal can produce 3,250 kWh of electricity.
You can also calculate electricity production by weight. Still based on standard coal, a thermal power plant needs approximately 350 g of coal to produce 1 kilowatt hour of electricity. The quality of thermal generator equipment can gradually reduce energy consumption per kilowatt hour. Calculated this way, a ton of coal can generate around 3,000 kilowatt hours of electricity.
The process of turning coal into electricity
First, the coal is burned in a boiler to produce a flame. The flame carries a large amount of heat and. heats water to form high-pressure steam, which burns the fuel. Chemical energy is converted into thermal energy; high pressure steam felm of energy, turns the steam turbine at high speed and converts thermal energy into mechanical energy.
The steam turbine then turns the generator, converting mechanical energy into electrical energy. The voltage generated by the generator is 22 kV, which is then increased to around 500 kV via a step-up transformer, and finally transmitted to thousands of homes via transmission lines.