Integrated system for pre-heating air and condensed water of turbine in grading manner by using boiler smoke
A boiler flue gas and integrated system technology, applied in the direction of preheating, steam generation, feed water heater, etc., can solve the problems of limited temperature utilization space and single form, and achieve the effect of improving power plant efficiency, reducing coal consumption, and increasing output power
Active Publication Date: 2012-11-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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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[0013] The invention provides and proposes an integrated system for heating air and condensed water of a steam turbine in stages by using waste heat of boiler flue gas. The following will be described in conjunction with the accompanying drawings and embodiments.
[0014] figure 1 Shown is a schematic diagram of the integrated system of boiler flue gas waste heat staged heating air and steam turbine condensate water. In the figure, the integrated system consists of a two-stage flue gas condensate heater and a two-stage air preheater; the system consists of a two-stage flue gas condensate heater and a two-stage air preheater; in the exhaust pipe of boiler 1 There are conventional rotary air preheater 2, primary flue gas condensate heater 3, dust collector 4, secondary flue gas condensate heater 5, front low-temperature air preheater 6 and induced draft fan 7 in series in sequence The steam turbine high-pressure cylinder 8, the steam turbine medium-pressure cylinder 9 and the ...
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The invention discloses an integrated system for pre-heating air and condensed water of a turbine in a grading manner by using boiler smoke, belonging to the energy-saving equipment using waste heat. According to the integrated system, smoke with a temperature about 300-400 DEG C at the tail of the boiler respectively enters a normal rotary type air heater, two smoke condensed water heaters and a prepositioned low-temperature air pre-heater, and is discharged from the system until the smoke is cooled to a temperature about 60-100 DEG C, so that the smoke with different temperature grades can be reasonably utilized. Meanwhile, the invention provides a set of a flexible low-pressure heat-backing and heating system of the condensed water of the turbine through a smart design of a pipeline and a valve, so that condensed water in a smoke condensed water heater can be flexibly extracted from a plurality of positions, and the smoke waste heat in various working conditions can be applied well. Furthermore, an air side and a condensed water side can be at an optimal waste heat recovery state when the entire smoke waste heat utilization system at the tail of the power station boiler is in various working conditions.
Description
technical field [0001] The invention belongs to the field of energy-saving equipment using waste heat, and in particular relates to an integrated system for heating air and condensed water of a steam turbine by using waste heat of boiler flue gas in stages, specifically, using an air preheater to heat air in stages and a heater for flue gas condensed water in stages Heating the condensed water to complete the graded waste heat utilization of the flue gas and reduce the coal consumption of the unit. technical background [0002] Energy saving and emission reduction of large thermal power units is an important national policy of China. 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 app...
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IPC IPC(8): F22D1/38
CPCY02P10/25Y02P80/15
Inventor 徐钢许诚杨勇平黄圣伟杨志平尹宗齐刘彤
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)