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Efficient desulfurization single-tower double-circulation system and method

A circulation system and desulfurization tower technology, which is applied in the field of coal-fired flue gas SO2 pollutant control, can solve the problems of tower series connection occupying a large area, desulfurization single tower height, long construction period, etc., to improve the dehydration rate and improve the purity of gypsum , pH value is easier to control the effect

Inactive Publication Date: 2014-12-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above transformation forms have some disadvantages such as high desulfurization single tower body, long construction period, large area occupied by series towers, and high investment.

Method used

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  • Efficient desulfurization single-tower double-circulation system and method
  • Efficient desulfurization single-tower double-circulation system and method
  • Efficient desulfurization single-tower double-circulation system and method

Examples

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Embodiment 1

[0039] refer to figure 1 , a high-efficiency desulfurization single-tower dual-cycle system, comprising a desulfurization tower 1, an air inlet 2 is provided on one side of the lower part of the desulfurization tower 1, and an air outlet 3 is provided on the other side of the upper part; the desulfurization single tower 1 is provided with A main slurry pool 4, the main slurry pool 4 is arranged below the air inlet 2, and an auxiliary slurry pool 5 is provided outside the desulfurization tower 1, and the auxiliary slurry pool 5 communicates with the main slurry pool 4 through a pipeline 6, The pipeline 6 is provided with a cut-off valve 42 and a flushing device 43; the upper part of the desulfurization tower 1 is provided with a first spray device 7, and the top of the first spray device 7 is provided with a second spray device 8, so The first spray device 7 includes more than two spray layers, the second spray device 8 includes more than one spray layer, and the first spray de...

Embodiment 2

[0045] refer to figure 1 , a high-efficiency desulfurization single-tower double-cycle method, comprising the steps of:

[0046] (1) The coal-fired flue gas enters the desulfurization tower 1 through the air inlet 2, and is desulfurized by the first spray device 7. The pH of the slurry in the main slurry tank 4 is controlled at 4.5-5.5, and the designed residence time of the slurry in the main slurry tank is not Less than 5 minutes; wherein, the slurry in the main slurry pool 4 enters the desulfurization tower 1 from the spray layer of the first spray device 7 connected to it through the first circulating slurry pump 9; in the main slurry pool, the pH of the slurry is controlled at 4.5 ~5.5, low pH is beneficial to the oxidation of sulfite and the crystallization of gypsum; agitators are radially arranged in the lower part of the main slurry tank, and its function is to make the slurry into a state of suspension and make it diffuse, that is, to maintain the solid in suspension...

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Abstract

The invention discloses an efficient desulfurization single-tower double-circulation system and method. The efficient desulfurization single-tower double-circulation system comprises a primary slurry pool in a desulfurization tower and a secondary slurry pool outside the desulfurization tower, and the two slurry pools are connected by virtue of a pipeline, so as to form a multiregion pH control double-circulation desulfurization system, wherein limestone slurry is supplemented from the secondary slurry pool to the primary slurry pool, and cypsum slurry is discharged from the primary slurry pool of the desulfurization tower. According to the efficient desulfurization single-tower double-circulation system, the region control can be performed on the pH of the two slurry pools, the slurry at different spraying layers is respectively supplied by the two slurry pools, the slurry with a high pH value is favorable for absorbing SO2, so that the desulphurization efficiency of a desulfurization system is more than 99%, and the slurry with a low pH value is favorable for sulfite oxidation and gypsum crystallization, so that the gypsum dehydration rate and the gypsum purity are increased.

Description

technical field [0001] The invention belongs to coal combustion flue gas SO 2 The technical field of pollutant control, specifically relates to a high-efficiency desulfurization single-tower double-circulation system and method. Background technique [0002] The newly promulgated GB13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants" issued by the Ministry of Environmental Protection has adjusted the emission limits of air pollutants. Newly built, rebuilt and expanded coal-fired thermal power boilers will implement 100mg / Nm 3 SO 2 emission concentration limit, while for key areas SO 2 Emission limit is 50mg / Nm 3 ; Some areas with severe environmental pollution even need to implement stricter emission standards to achieve SO 2 Ultra-low emissions or even near zero emissions. [0003] For conventional desulfurization single tower, it is necessary to select a more suitable pH value range, which not only ensures the SO 2 It is also necessary to ensure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 高翔郑成航骆仲泱岑可法倪明江张涌新李钦武施正伦周劲松方梦祥程乐鸣王勤辉
Owner ZHEJIANG UNIV
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