Medium-temperature coal economizer system and method thereof for recovering smoke afterheat

A flue gas waste heat and economizer technology, applied in preheating, feed water heaters, lighting and heating equipment, etc., can solve problems such as blockage of heat exchange surfaces, reduce flue gas temperature, improve operating economy, and improve dust removal efficiency Effect

Inactive Publication Date: 2015-10-14
冯伟忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For boilers with normal exhaust gas temperature, if the exhaust gas temperature is further lowered, the average wall temperature of the heat exchange fins on the low temperature side of the air preheater will drop below the design value, whic...

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  • Medium-temperature coal economizer system and method thereof for recovering smoke afterheat
  • Medium-temperature coal economizer system and method thereof for recovering smoke afterheat

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Embodiment Construction

[0066] figure 1 It is a schematic diagram of a medium temperature economizer system according to an embodiment of the present invention, such as figure 1 As shown, the unit includes boiler 1, denitrification device 2, air preheater 3, dust collector 4, suction fan 5 and chimney 6, and the medium temperature economizer system includes inlet flue gas baffle 7, 'smoke-water' heat exchange device 81, 82 and heat exchange device 9.

[0067] The medium temperature economizer system in this embodiment includes two 'flue-water' heat exchange devices 81, 82, the smoke inlet of the 'flue-water' heat exchange device 81 passes through the flue at the inlet of the air preheater 3 The first flue is connected, the smoke outlet of the 'smoke-water' heat exchange device 81 is connected to the smoke inlet of the 'smoke-water' heat exchange device 82 through the flue, and the smoke outlet of the water heat exchange device 82 is connected to the air preheater The flue at the outlet of the heate...

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Abstract

The invention provides a medium-temperature coal economizer system. The medium-temperature coal economizer system comprises at least one smoke-water heat exchange device, a first flue and a second flue, wherein a smoke inlet of the smoke-water heat exchange device and a flue in an inlet of an air preheater are connected through the first flue; a smoke outlet of the smoke-water heat exchange device and a flue in an outlet of the air preheater are connected through the second flue; and the medium-temperature coal economizer system further comprises a heat exchange device for heating inlet air of the air preheater. The medium-temperature coal economizer system, provided by the invention, shunts part smoke in the inlet of the air preheater, heats water in the smoke-water heat exchange device, heats the inlet air of the air preheater through an air-steam/water heat exchange device, can recover the smoke afterheat, can reduce the smoke temperature, can satisfy the requirement of lowering the smoke temperature in the inlet of a low-temperature dust remover, can improve the dust removing efficiency, and can prevent such problems as low-temperature corrosion and blockage at a cold end of the air preheater. The invention further provides a method for recovering the smoke afterheat by adopting the medium-temperature coal economizer system.

Description

technical field [0001] The invention belongs to the field of thermal coal-fired generating sets, and in particular relates to a medium-temperature economizer system applied to a thermal power plant and a method for recovering waste heat from flue gas. Background technique [0002] The flue of the traditional thermal power plant unit before the air preheater is equipped with a high-temperature economizer, which uses the heat of the flue gas of the boiler to heat the feed water, which can absorb the heat of the flue gas to improve the efficiency of the boiler and increase the temperature of the feed water in the water wall. , with the continuous improvement of environmental protection requirements such as energy saving and emission reduction, some thermal power plant units will also configure a 'flue-water' heat exchanger in the follow-up flue of the boiler air preheater, that is, use the flue gas after the boiler air preheater The heat is used to heat condensed water or hot n...

Claims

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Application Information

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IPC IPC(8): F22D1/36
Inventor 冯伟忠
Owner 冯伟忠
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