Waste heat utilizing system of thermal power plant and thermal power unit

Abstract

The invention provides a waste heat utilizing system of a thermal power plant and a power unit. The waste heat utilizing system of the thermal power plant comprises a boiler outlet flue gas waste heat utilizing system, an air preheater outlet flue gas waste heat utilizing system and a driving steam turbine steam exhaust waste heat utilizing system; the flue gas of the air preheater outlet is used for heating the condensed water from a low-pressure heater; the driving steam turbine steam exhaust waste heat utilizing system comprises a steam-water heat exchanger and an air-water heat exchanger which are formed into a steam-water-air heat exchange system; primary air and or secondary air of the air preheater inlet are or is heated by the steam exhaust of a driving steam turbine through the steam-water-air heat exchange system; the feed water and the condensed water are heated by part of high temperature flue gas of the boiler outlet. According to the waste heat utilizing system of the thermal power plant and the thermal power unit, the waste heat energy of the thermal power plant is effectively utilized and accordingly the efficiency of the thermal power plant is improved, meanwhile the coal consumption is reduced, and emissions of pollutants are reduced.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a thermal power plant waste heat utilization system and a thermal power unit. Background technique [0002] With the development of the national economy, the society's demand for electricity is constantly increasing. For emerging developing countries that are undergoing industrialization and rapid economic development, such as China, the consumption of electricity and the installed capacity of power plants are increasing rapidly. As far as China is concerned, due to the limitation of its primary energy storage types and storage capacity, coal has been the main fuel for power plants in recent decades, accounting for more than 70%, and this trend will not occur in the foreseeable future. radical change. Although coal-fired power plants have advantages such as low cost and wide range of fuel sources for China, they have disadvantages such as low efficiency and high pollutan...

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Problems solved by technology

[0003] At present, the energy utilization rate of thermal power plants is relatively low, and the thermal efficiency of the whole plant is between 35% and 45%. The thermal efficiency of the thermal power plant with the highest efficiency in the world is not higher than 46%.

It can be seen that about 60% of the energy is discharged into the environment and is not used

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