A desulfurization absorption tower for eliminating "gypsum rain" in flue gas desulfurization of coal-fired boilers

A desulfurization absorption tower, coal-fired boiler technology, applied in the direction of dispersed particle separation, chemical instruments and methods, separation methods, etc., can solve the problems of energy consumption and can not really solve the problem, and achieve low operating energy consumption and strong industrial reliability , the effect of large operating flexibility

Active Publication Date: 2016-11-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is obvious that setting up GGH not only has the serious flaws above, but also a kind of next-level work that consumes energy and cannot really solve the problem

Method used

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  • A desulfurization absorption tower for eliminating "gypsum rain" in flue gas desulfurization of coal-fired boilers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The flue gas of a coal-fired boiler in a 300MW power plant adopts a wet lye full flue gas desulfurization process. The desulfurization system mainly includes WFGD compressor fan, desulfurization absorption tower, slurry circulation pump, gypsum dehydrator, etc. The diameter of the desulfurization absorption tower is 12600mm, and there are two-stage demisters above it, and GGH is used for heat exchange before the flue gas is discharged. Since the day of normal operation, it was found that the phenomenon of gypsum rain around the chimney was serious. After testing, the liquid foam content in the discharged flue gas is more than 260mg / m3, and the diameter of the liquid droplets is more than 20μm. With the increase of the operating time of the unit, the pressure difference of the mist eliminator is getting higher and higher, and the liquid foam content in the flue gas has also increased significantly, showing a worsening trend, and the second mist eliminator is ...

Embodiment 2

[0022] Example 2: The flue gas of a coal-fired boiler of a 150MW self-provided power plant adopts a wet lye full flue gas desulfurization process. The desulfurization system mainly includes compressor fan, desulfurization absorption tower, slurry circulation pump, gypsum dehydrator, etc. The diameter of the desulfurization absorption tower is 8800mm, and there are two-stage demisters above it, and GGH is used for heat exchange before the flue gas is discharged. After the completion, the operation found that the phenomenon of gypsum rain around the chimney was serious. After testing, the liquid foam content in the discharged flue gas is more than 312 mg / m3, and the diameter of the liquid droplets is mostly more than 20 μm. With the increase of the operating time of the unit, the pressure difference of the mist eliminator is getting higher and higher, and the liquid foam content in the flue gas has also increased significantly, showing a worsening trend, and the second mist eli...

Embodiment 3

[0025] Example 3: The flue gas of a 300MW×2 coal-fired boiler power plant adopts a wet lye full flue gas desulfurization process, and a desulfurization system is combined. The desulfurization system mainly includes compressor fan, desulfurization absorption tower, slurry circulation pump, gypsum dehydrator, gypsum liquid oxidation system, etc. The desulfurization absorption tower is rectangular 20000×16000mm 2 , There is a two-stage demister above it, and GGH is used for heat exchange before the flue gas is discharged. After the completion, the operation found that the phenomenon of gypsum rain around the chimney was serious. After testing, the liquid foam content in the discharged flue gas is more than 363 mg / m3, and the diameter of the liquid droplets is mostly more than 20 μm. With the increase of the operating time of the unit, the pressure difference of the mist eliminator is getting higher and higher, and the liquid foam content in the flue gas has also increased signi...

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Abstract

A desulfurization absorption tower that eliminates "gypsum rain" in flue gas desulfurization of coal-fired boilers, as shown in Figure 1, is characterized in that: a diameter-expanding concentric gas distributor 1 is added on the top of the existing original desulfurization tower, and the diameter-expanding concentric gas distribution The device 1 is connected to the original desulfurization tower and the expanded diameter strengthened defoaming tower body 10 sections are connected. Inside the body 10, from bottom to top, there are composite gas scrubbing trays 2, washing packing layers 5 and mist eliminators 8, as well as clean water sprayers 6 for packing matching the washing packing layers 5 and matching with the mist eliminators 8. The matched mist eliminator sprays the washer 9 with water, and there is a net flue gas outlet 11 on the top of the expanded-diameter enhanced demister tower body 10 . The invention can completely eliminate the pollution of "gypsum rain", and has the outstanding advantages of high operating flexibility, anti-dirty blockage, low energy consumption, low investment and high efficiency.

Description

technical field [0001] The invention relates to the treatment of flue gas discharged from coal combustion. Background technique [0002] According to statistics, among the flue gas desulfurization units that have been put into operation nationwide, 300MW and above flue gas desulfurization units account for about 86%, and more than 90% of the units use limestone-gypsum wet flue gas desulfurization (WFGD) technology (Zeng Tinghua, Yang Hua , Liao Yongjin, etc. Commissioning test and operation of wet flue gas desulfurization system [M]. China Electric Power Press, Beijing, 2008.). In a typical limestone-gypsum wet system process, the high-temperature flue gas is first sent to the rotary flue gas heater (GGH) by the WFGD booster fan. In the GGH, the untreated high-temperature raw flue gas is discharged from the desulfurization tower. The net flue gas at about 50°C exchanges heat. The cooled raw flue gas enters the desulfurization absorption tower and contacts the sprayed gypsum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/96B01D53/50
Inventor 张志炳张锋孟为民罗华勋巫先坤
Owner NANJING UNIV
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