Method for improving quality of recyclable exhaust waste heat in power plant boiler and progressively utilizing exhaust waste heat

Abstract

The invention discloses a method for improving the quality of recyclable exhaust waste heat in a power plant boiler and progressively utilizing the exhaust waste heat. A heat source for heating air entering an air pre-heater is connected in series to the front end of the air pre-heater of a boiler air input cold air duct, a first heat exchanger is connected in series to a boiler exhaust flue, andthe first heat exchanger is arranged in back of the air pre-heater of the boiler exhaust flue and in front of a desulfurizing tower and used for heating boiler water of a boiler heat recovery system.By using the method, the quality of the recyclable exhaust waste heat can be effectively improved, so that the recycling efficiency of the boiler exhaust waste heat is higher, the efficiency of the boiler and a steam turbine is improved, and the energy consumption for power generation is reduced.

Description

technical field [0001] The invention relates to a method for improving the quality of recyclable smoke waste heat of a boiler in a thermal power plant and utilizing it step by step. Background technique [0002] Coal-fired boilers in thermal power plants provide power generation energy for generating units, and at the same time a large amount of heat energy is discharged from the chimney along with boiler flue gas; in the context of vigorously advocating energy conservation and emission reduction today, how to reduce the heat loss of exhaust gas for coal-fired boilers in thermal power plants, Therefore, saving energy and protecting the environment are of great significance. [0003] The exhaust smoke loss in the operation of the thermal power plant boiler is the most important heat loss. If the exhaust heat of the boiler can be recovered to the maximum extent and utilized in the generator set, the boiler efficiency, economic benefits and social benefits can be improved. ben...

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Problems solved by technology

In this method, the temperatures at both ends of the general heat exchanger 2 are 115°C and 90°C respectively, and the temperature difference is 25°C. Similarly, the quality of the waste heat of the flue gas is not high, and the heat exchanger 2 can only be used for heating and desulfurization after the temperature is low. The flue gas does not affect the improvement of boiler efficiency

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