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Desulfuration method by supplementing air to enhance low-load adaptability based on wet desulfuration tower

A supplementary air, wet desulfurization technology, applied in the field of desulfurization, can solve problems such as blockage, failure to maintain desulfurization tower, tail flue of desulfurization efficiency and equipment corrosion, and achieve uniform air distribution, high reliability and safe operation

Inactive Publication Date: 2010-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a desulfurization method based on wet desulfurization tower supplementary air to enhance low-load adaptability, to solve the problem that when the load of the desulfurization tower is less than 30% of the rated load, the amount of flue gas entering the desulfurization tower cannot be kept in the desulfurization tower. Mist removal efficiency, desulfurization efficiency of demister and corrosion and blockage of tail flue and equipment

Method used

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  • Desulfuration method by supplementing air to enhance low-load adaptability based on wet desulfuration tower
  • Desulfuration method by supplementing air to enhance low-load adaptability based on wet desulfuration tower

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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the desulfurization method based on the supplementary air of the wet desulfurization tower to enhance the low-load adaptability in this embodiment is carried out by using a wet desulfurization tower, and the desulfurization method is implemented according to the following steps:

[0011] Step 1. Add calcium-based slurry to the desulfurization tower 7, the calcium-based slurry contains gypsum seeds with a mass percentage of 5-8%, and an air pipe 13 is provided at the bottom of the desulfurization tower 7 to provide CaSO 3 Oxygen required for oxidation, CaSO 3 from the SO in the flue gas 2 with CaCO in calcium-based slurry 3 or Ca(OH) 2 generated by the reaction, an agitator 9 is set on the side wall of the desulfurization tower 7 to stir the calcium-based slurry;

[0012] Step 2, send the flue gas to be treated into the cavity between the calcium-based slurry liquid level in the desulfu...

specific Embodiment approach 2

[0014] Specific implementation mode two: combination figure 1 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is that in step 3, the flue gas to be treated and the ambient air are blown into the desulfurization tower 7 under the negative pressure at the inlet of the desulfurization booster fan 5, and the desulfurization booster The fan 5 is arranged on the flue gas inlet pipe 14 where the ambient air and the flue gas to be treated are mixed. Ambient air and flue gas to be treated can be automatically extracted through the negative pressure at the inlet of the desulfurization tower 7 generated by the booster fan 5 without adding an additional power device.

[0015] Such as figure 1 , in this embodiment, when the load of the desulfurization system is greater than 30% of the rated load, the load in the desulfurization tower meets the adaptability requirements at this time, and the original flue gas enters the desulfurization tower 7 and...

specific Embodiment approach 3

[0016] Specific implementation mode three: combination figure 2 Describe this embodiment, the difference between this embodiment and specific embodiment one is that in step three, the flue gas to be treated and the ambient air are drawn into the desulfurization tower 7 under the effect of the negative pressure at the inlet of the desulfurization tower 7 generated by the induced draft fan 15 , The induced draft fan 15 is arranged on the purified flue gas discharge pipe 2 . Ambient air and flue gas to be treated can be automatically extracted through the negative pressure at the outlet of the desulfurization tower 7 generated by the induced draft fan 15, without adding additional power devices.

[0017] Such as figure 2 , in this embodiment, when the load of the desulfurization system is greater than 30% of the rated load, the load in the desulfurization tower meets the adaptability requirements at this time, and the original flue gas enters the desulfurization tower 7 and co...

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Abstract

The relates to a desulfuration method by enhancing low-load adaptability of a desulfuration tower, in particular to a desulfuration method by supplementing air to enhance low-load adaptability based on a wet desulfuration tower, which solves the problems that the demisting efficiency and the desulfuration efficiency of a demister in the desulfuration tower can not be maintained and tail-part gas flues and equipment are easily corroded and blocked when the load of the desulfuration tower is less that 30% of the rated load and the quantity of flue gas flowing into the desulfuration tower is too small. In the desulfuration method, a calcium-based paste is added to the desulfuration tower, flue gas to be processed is sent into the desulfuration tower and performs desulfuration reaction with the atomized calcium-based paste drops, and the desulfurated flue gas flows out of the desulfuration tower after be demisted; and when the load of the desulfuration tower is less than 30% of the rated load, environmental air and the flue gas to be processed are mixed to flow into the desulfuration tower and performs desulfuration reaction with the calcium-based paste drops, and an air supplementing regulator is used to regulate the flow of the environmental air. The invention ensures that the load of the flue gas in the desulfuration tower is at least 30% of the rated load which is the lower limit for stable operation, and obviously enhances the low-load adaptability of the desulfuration system.

Description

technical field [0001] The invention relates to a desulfurization method, in particular to a desulfurization method based on supplementary air of a wet desulfurization tower to enhance low-load adaptability, and belongs to the technical field of flue gas desulfurization technology. Background technique [0002] Wet flue gas desulfurization is currently the most widely used and most effective desulfurization process in the world, but the wet desulfurization tower has a certain load adaptability, generally at 30% to 110% of the rated load, when the load of the desulfurization tower is lower than 30% of the rated load , it will cause a series of problems: (1) The desulfurization tower generally adopts an inertial separation demister. When the flue gas flow rate drops, a large number of small droplets carried by the clean flue gas after desulfurization will be separated due to the droplet inertia force and centrifugal force. The efficiency drops, that is, the demisting effect is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 杜谦高继慧高建民刘辉王建峰明磊凌赵昊阳贾利峰吴少华秦裕琨
Owner HARBIN INST OF TECH