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Externally heating type wet flue gas dehumidifying method and system

A technology for heating, dehumidifying, and humid flue gas, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., and can solve the problems of low service life of flue gas heat exchangers, white smoke, and high heating costs of low-temperature wet flue gas. Achieve the effect of small system site area, prolong service life and reduce energy consumption

Active Publication Date: 2014-03-19
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide an external heating type wet flue gas dehumidification method in order to overcome the defects of high heating cost of low temperature wet flue gas and low service life of the flue gas heat exchanger in the prior art
This method is simple and can effectively increase the flue gas temperature, thereby solving the problem of "white smoke" when the chimney is discharged, and this method can prolong the service life of the flue gas heat exchanger

Method used

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  • Externally heating type wet flue gas dehumidifying method and system

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specific Embodiment 1

[0031] refer to figure 1, The external heated wet flue gas dehumidification system involved in this embodiment includes a desulfurization absorption tower 1, a chimney 2, a main flue 3, a pressurized fan 4, an external steam heat exchanger 5, and a first switch valve 6-1 , the second switching valve 6-2, the third switching valve 6-3, the first flow regulating valve 7-1, the first flow detector 8-1, the second flow detector 8-2, the first temperature detector 9 -1, the second temperature detector 9-2, the third temperature detector 9-3 and an external heat source 14, the desulfurization absorption tower 1 is connected to the chimney 2 through the main flue 3, and is close to the chimney on the main flue 3 The smoke outlet is set at the 2nd end, and the smoke inlet is set at the 1st end of the desulfurization absorption tower. The smoke outlet is connected to the air inlet end of the pressurized fan 4 through the first switching valve 6-1 and the first flow regulating valve 7-1...

specific Embodiment 2

[0043] The characteristics of this embodiment 2 are: the external heating type wet flue gas dehumidification system also includes a mixing chamber and filter screen, the main flue 3 is provided with a mixing chamber, the mixing chamber and the external heating type wet flue gas dehumidification The system is connected, and the external heated wet flue gas dehumidification system extracts air 13 through the pressurized fan 4, heats the air 13 through the external steam heat exchanger 5, and the heated air 12 enters the mixing chamber and is mixed with the main flue 3 The low-temperature wet flue gas 11 is mixed into medium-temperature flue gas 10, and the first on-off valve 6-1 at the front end of the pressurized fan 4 is replaced with a filter to filter the air 13. All the other are with specific embodiment 1.

specific Embodiment 3

[0044] The feature of this embodiment is that the fourth temperature detector and the fourth flow regulator are installed on the external heat source, and other features are the same as those of the specific embodiment 1.

[0045] In this external heating type wet flue gas dehumidification method, the air 13 is absorbed by the pressurized fan 4, the air 13 is heated to 160°C, and then the high-temperature air is input into the main flue 3 and mixed with the low-temperature wet flue gas 11 to form a medium-temperature flue gas 13 , so that the final exhaust gas temperature is higher than the "white smoke" temperature. Other features are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to an externally heating type wet flue gas dehumidifying method and system. The externally heating type wet flue gas dehumidifying method is characterized in that the externally heating type wet flue gas system is arranged, part of wet flue gas is extracted and reheated, and the heated wet flue gas is changed into high-temperature flue gas and is refilled into low-temperature wet flue gas to increase the final exhaust temperature of the flue gas; part of medium-temperature flue gas is extracted from the inlet of a chimney and is fed into an external steam heat exchanger of the externally heating type wet flue gas system, the heating steam is from auxiliary steam of a thermal power plant or other heat sources of heat supply systems, the medium-temperature flue gas is heated to high-temperature flue gas of 160 DEG C by the externally heating type wet flue gas system and then is fed into low-temperature wet flue gas after being boosted by a booster fan, and all the low-temperature wet flue gas is heated into the medium-temperature flue gas and is exhausted into the chimney to realize dehumidification of the wet flue gas. The externally heating type wet flue gas dehumidifying method can eliminate 'white smoke' phenomenon when the flue gas is exhausted from the chimney, and has the characteristics of having small occupied area and capability of operating continuously and safely.

Description

technical field [0001] The invention relates to a flue gas heating treatment method and system, in particular to an external heating type wet flue gas dehumidification method and dehumidification system. It belongs to the technical field of electric power generation. Background technique [0002] The wet desulfurization units of GGH without flue gas heat exchangers in thermal power plants all have the problem of gypsum rain entrained in the flue gas. When the flue gas with saturated moisture content cools down, a large amount of water droplets will condense, forming the appearance of "white smoke" from the chimney, not only It is unsightly, and the gypsum raindrops entrained in the white smoke fall to the ground, causing corrosion of peripheral equipment and pipelines. The solutions adopted in China are limited, and it is often impossible to implement the transformation due to problems such as investment, site, and operating costs. This problem has always plagued power gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/26
Inventor 樊晓茹霍沛强李伟科
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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