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Single-tower and double-circulation desulfurization and dust removal device and technology

A technology of desulfurization, dust removal, and double circulation, which is applied in combination devices, separation methods, and dispersed particle separation. and other problems, to achieve the effect of ensuring the effect of atomization and condensation, optimizing the reaction process, and increasing the contact area of ​​gas and liquid

Active Publication Date: 2017-05-24
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional single-tower double-circulation process simply installs a slurry recovery device between the upper and lower spray layers, the slurry cannot be atomized, the gas-liquid mass transfer effect is poor, and there is liquid leakage; the gas redistribution in this process And the liquid collection layer is equivalent to a combination of a Venturi device and a liquid recovery device
The venturi throat gap of the traditional Venturi device is fixed, and the change of the boiler load will cause the droplet atomization, mass transfer and cooling effect to deteriorate; quality parts, the pH value of the slurry is low and single, and the desulfurization efficiency is low

Method used

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  • Single-tower and double-circulation desulfurization and dust removal device and technology
  • Single-tower and double-circulation desulfurization and dust removal device and technology

Examples

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Effect test

Embodiment 1

[0062] A thermal power plant, two 60WM unit flue gas new desulfurization project adopts this process, the main tower flue gas flow rate is 3.8m / s, the SO in the inlet flue gas 2 The concentration is 1565mg / Nm 3 , the dust concentration in the inlet flue gas is 53mg / Nm 3 , the coarse spray absorption is 2 layers, and the liquid-gas ratio of the inner circulation is 12L / Nm 3 , the pH value of the slurry is 5-5.5; the fine absorption reaction layer is 1 layer, and the liquid-gas ratio of the external circulation is 1.0L / Nm 3 , the pH value of the slurry is 7-8; the resistance of the flue gas passing through the Venturi is 500Pa, the average particle size of the droplet atomization is 42μm, and the diameter of the Venturi rod is 100mm; , the SO in the outlet flue gas 2 The concentration is 11mg / Nm 3 , the desulfurization efficiency reaches 99.3%, and the dust concentration in the outlet flue gas is 3.1mg / Nm 3 .

Embodiment 2

[0064] A self-provided electroplating power plant, a 300t / h boiler flue gas desulfurization renovation project adopts this process, the flue gas flow rate of the main tower is 3.5m / s, and the SO in the inlet flue gas 2 The concentration is 1874mg / m 3 , the dust concentration in the inlet flue gas is 67mg / Nm 3 , the coarse spray absorption is 2 layers, and the liquid-gas ratio of the inner circulation is 15L / Nm 3 , the pH value of the slurry is 5.5-5.8; the fine absorption reaction layer is 1 layer, and the liquid-gas ratio of the external circulation is 0.8L / Nm 3 , the pH value of the slurry is 7-8; the resistance of the flue gas passing through the Venturi is 580Pa, the average particle size of the droplet atomization is 38μm, and the diameter of the Venturi rod is 100mm; , the SO in the outlet flue gas 2 The concentration is 18mg / Nm 3 , the desulfurization efficiency reaches 99.0%, and the dust concentration in the outlet flue gas is 3.6mg / Nm 3 .

Embodiment 3

[0066] In a printing and dyeing factory, a 75t / h boiler flue gas desulfurization renovation project adopts this process, the flue gas flow rate in the main tower is 3.6m / s, and the SO in the inlet flue gas 2 The concentration is 1472mg / m 3 , the dust concentration in the inlet flue gas is 47mg / Nm 3 , the coarse spray absorption is 2 layers, and the liquid-gas ratio of the inner circulation is 13L / Nm 3 , the pH value of the slurry is 5.5-5.8; the fine absorption reaction layer is 1 layer, and the liquid-gas ratio of the outer circulation is 1.0L / Nm 3 , the pH value of the slurry is 7-8; the resistance of the flue gas passing through the Venturi is 550Pa, the average particle size of the droplet atomization is 36μm, and the diameter of the Venturi rod is 100mm; , the SO in the outlet flue gas 2 The concentration is 10mg / Nm 3, the desulfurization efficiency reaches 99.3%, and the dust concentration in the outlet flue gas is 2.8mg / Nm 3 .

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Abstract

The invention discloses a single-tower and double-circulation desulfurization and dust removal device and technology. The device comprises an absorption tower, wherein a tray orifice plate, coarse desulfurization sprayers, a gas redistribution and liquid collection layer, fine desulfurization sprayers and a cyclone demister are arranged in the adsorption tower and located above a flue gas inlet from bottom to top in sequence, the coarse desulfurization sprayers are communicated with a column bottom through a circulating pump, and the fine desulfurization sprayers are externally connected with a slurry feed pump; the gas redistribution and liquid collection layer comprises a liquid collection part and a gas redistribution part, the liquid collection part is fixed on the wall of the adsorption tower and covers a cross section of the adsorption tower completely, the gas redistribution part is located below the liquid collection part, the mounting height of the gas redistribution part is adjustable, the liquid collection part is communicated with an external pipeline, the gas redistribution part comprises a plurality of round pipes which are parallel to each other and are arranged horizontally, and a gas channel is formed by a gap between every two adjacent round pipes. The technology comprises a coarse desulfurization and dust removal stage and a fine desulfurization and dust removal stage, wherein by means of a Venturi bar layer at the fine desulfurization and dust removal stage, liquid-gas contact area can be increased and gas-liquid mass transfer rate is increased.

Description

technical field [0001] The invention relates to a high-efficiency single-tower double-cycle desulfurization and dust removal process, which belongs to the field of resources and environmental protection. Background technique [0002] With the recent rapid development of thermal power generation, SO 2 Emissions are increasing year by year, causing acid rain to intensify. In addition, the tail gas emitted by chimneys contains a large amount of fine particle dust, which causes frequent occurrence of smog in many cities and seriously endangers human health. In response to the increasingly severe air pollution situation, the relevant departments of the state and local governments have issued some strict air pollution prevention and control plans, requiring new or under construction thermal power units to meet the emission requirements of gas-fired units, and SO in the exhausted flue gas 2 ≤35mg / Nm 3 , Dust≤5mg / Nm 3 , NOx≤50mg / Nm 3 , to achieve ultra-low emissions. This puts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D50/00
CPCB01D53/50B01D53/80B01D2258/0283B01D50/40
Inventor 吴忠标李泽清王岳军陈美秀莫建松叶涛
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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