Residual heat is good. Waste thermal power generation is a technology that converts excess thermal energy into electrical energy during the production process. The production of waste thermal energy not only saves energy, but also benefits environmental protection. The important equipment for the production of waste thermal energy is the waste heat boiler. It uses heat or combustible substances present in waste gases, waste liquids and other working fluids as a heat source to produce steam for electricity generation.
A thermal power plant is a factory that uses coal, oil and natural gas as fuel to produce electrical energy. Its basic production process is as follows: fuel is burned in the boiler and heated water is transformed. in vaporeur, which converts the chemical energy of the fuel. The steam pressure causes the steam turbine to rotate, and the thermal energy is converted into mechanical energy. The steam turbine then turns the generator, converting mechanical energy into electrical energy. Thermal power plants are classified as follows: According to fuel: coal-fired power plants, oil-fired power plants, gas-fired power plants, waste heat power plants, power plants using garbage and industrial waste as fuel; temperature: the working fluids in the boiler are It is water. The critical parameters of water are: 22.064 MPa and 373.99 ℃ At this pressure and temperature, the density of water and steam is the same, which is called the critical point of water. The pressure of the working fluid in the furnace is less than this pressure and is called subcritical boilers, the pPressures higher than this are called supercritical boilers. The steam temperature in the oven is not lower than 593°C or the steam pressure is not lower. than 31MPa, which is called ultra-supercritical.
Medium and low pressure power plants (3.92 MPa, 450 degrees), high pressure power plants (9.9 MPa, 540 degrees), ultra high pressure power plants (13.83 MPa , 540 degrees), subcritical pressure power plants (16.77 MPa, 540 degrees), supercritical pressure power plants (22.11 MPa, 550 degrees); from the selection of parameters of supercritical or ultra-supercritical units that have been built and under construction at international and national level, for supercritical and ultra-supercritical units There is no hard limit, it is simply to know what the value of the parameter is. At present, domestic and international people generally think that so muchWhether the main steam temperature reaches or exceeds 600°C, it is considered an ultra-supercritical unit. According to the prime mover: condensing steam turbine power plant, gas turbine power plant, internal combustion engine power plant, steam-gas turbine power plant, etc. depending on the energy produced, condensing steam plant (only produces electricity), thermal; power plant (produces electricity and heat); According to the installed capacity of power plants: small capacity power plants (less than 100 MW), medium capacity power plants (100-250 MW), large and medium capacity power plants (250-1,000 MW), power plants of large capacity (above 1,000 MW); thermal power plants. There are several types of wastewater produced: industrial wastewater, domestic wastewater, coal-containing wastewater, and acid-base wastewater. classification, andThe processes are also different.