An external heating type wet flue gas dehumidification method and dehumidification system

A technology for heating dehumidification and wet flue gas, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, and can solve problems such as white smoke, low service life of flue gas heat exchangers, and high heating costs of low-temperature wet flue gas. To achieve the effect of prolonging the service life, small system site area and reducing energy consumption

Active Publication Date: 2016-06-15
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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  • Summary
  • 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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  • An external heating type wet flue gas dehumidification method and dehumidification system
  • An external heating type wet flue gas dehumidification method and dehumidification system
  • An external heating type wet flue gas dehumidification method and dehumidification 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 external heating type wet flue gas dehumidification method and dehumidification system, which is characterized in that: an external heating type wet flue gas dehumidification system is set, and part of the wet flue gas is extracted for reheating, and the heated part of the flue gas After becoming high-temperature flue gas, re-inject it into the low-temperature wet flue gas to increase the final discharge temperature of the flue gas; extract part of the medium-temperature flue gas at the chimney inlet, and send it to the external steam heat exchange of the external heating wet flue gas dehumidification system The heating steam comes from the auxiliary steam of the thermal power plant or other heating sources. In the external steam heat exchanger, the extracted flue gas is heated to a high-temperature flue gas of 160°C, and the pressure is boosted by the pressurized fan. Then send it into the low-temperature wet flue gas, heat all the low-temperature wet flue gas into medium-temperature flue gas, and then discharge it into the chimney to complete the dehumidification of the wet flue gas. The invention eliminates the phenomenon of "white smoke" when the chimney is discharged, and has the characteristics of small occupied area and continuous and safe operation.

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 Patents(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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