Deep coupling utilization system for turbine steam exhaust waste heat and boiler flue gas waste heat

Abstract

The invention aims to provide a deep coupling utilization system for turbine steam exhaust waste heat and boiler flue gas waste heat in order to improve the heat efficiency of a generator set, lower the energy consumption and reduce the pollution. The deep coupling utilization system for the turbine steam exhaust waste heat and the boiler flue gas waste heat comprises a primary fan and a secondary fan. An exhaust port of the primary fan is connected to an air inlet of a primary air conveying pipeline, and the middle of the primary air conveying pipeline penetrates through a primary air heat exchange channel of an air pre-heater. An exhaust port of the secondary fan is connected to an air inlet of a secondary air conveying pipeline, and the middle of the secondary air conveying pipeline penetrates through a secondary air heat exchange channel of the air pre-heater. A flue gas channel is formed in one side of the air pre-heater and is connected to the middle of a flue in series, and a dust remover is arranged at the outlet end of the flue. An air heater is connected to the parts, located at the air inlet section of the air pre-heater, of the primary air conveying pipeline and the secondary air conveying pipeline in series.

Description

technical field [0001] The invention relates to a deep utilization system for waste heat of exhaust steam of a steam turbine coupled with waste heat of boiler flue gas. Background technique [0002] Currently, thermal power units still play an important role in the electricity production of major economies. With the decrease of fossil energy, the increasing requirements of environmental protection and the national energy industry policy put forward higher standards for energy saving and consumption reduction of thermal power generation, how to further reduce the energy consumption per unit of power generation to achieve energy saving and emission reduction is an important task for power generation enterprises. [0003] Based on the steam Rankine power cycle theory, when the unit generates electricity, the exhaust steam of the steam turbine needs to produce a large amount of energy loss, which accounts for about 40% of the input energy of the unit. The technical measures for...

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Problems solved by technology

However, due to the current technical measures such as low-temperature economizer, due to the influence of low-temperature corrosion and other factors on the exhaust gas temperature, the energy grade of waste heat utilization is low, and the space for improving unit efficiency is limited.

In addition, the air preheater of the important auxiliary equipment of the boiler has the problems of low-temperature corrosion that leads to large air leakage and increased power consumption of the fan. At the same time, after the SCR flue gas denitrification device is put into operation, the low flue gas temperature also leads to ammonia bisulfate generated after the ammonia escapes. It is easy to accumulate on the heating surface of the air preheater to cause corrosion and blockage

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