Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure

Abstract

The invention discloses a smoke waste heat deep utilization system of a coal-fired power station boiler for heating supplied water at a high pressure, belonging to the field of energy-saving equipment using waste heat. According to the smoke waste heat deep utilization system, smoke with a temperature about 300-400 DEG C at the tail of the boiler respectively enters a high-temperature rotary type air pre-heater (2), a smoke condensed water heater (3) and a low-temperature rotary type air pre-heater (4), enters a prepositioned air pre-heater (6) after passing through a dust collector (5), and is discharged out of the system until the smoke is cooled to a temperature about 60-100 DEG C; and supplied water at the high pressure in a back-heating system is heated by using the high-temperature smoke, so that a higher energy-saving effect can be obtained. Meanwhile, the water at an inlet of the smoke condensed water heater (3) can be flexibly adjusted through a pipeline design, so as to be extracted from inlets of different high-pressure heat regenerators. Therefore, when the entire smoke waste heat utilization system at the tail of the power station boiler is in various working conditions, an air side and a water feeding side are at an optimal operation working condition.

Description

technical field [0001] The invention belongs to the field of energy-saving equipment using waste heat, and in particular relates to a deep utilization system for waste heat of power station boiler flue gas used for heating high-pressure feed water. Specifically, the air preheater is used to heat the air in stages and the flue gas feed water heater is used to heat the main feed water to complete the deep utilization of the waste heat of the flue gas and reduce the coal consumption of the unit. technical background [0002] In China, coal-fired power plants consume nearly half of the country's coal production. With the continuous rise of coal energy prices in recent years, the cost of coal-based power generation is increasing. All thermal power plants are facing huge energy-saving pressure and are constantly seeking to reduce Coal consumption, new technologies applied in energy conservation, and increase related capital investment. [0003] In order to avoid acid dew point co...

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Problems solved by technology

[0005] At present, it is suitable to use the waste heat of flue gas at the tail of the boiler directly to use the low-temperature flue gas at the outlet of the air preheater to heat the condensed water. Since the exhaust gas temperature of the air preheater is about 120-140°C, the temperature utilization space is limited and the form is single.

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