Film method aeration industrial flue gas desulfurization seawater recovery process

A technology for desulfurization of seawater and industrial flue gas, which is applied in gaseous effluent wastewater treatment, oxidized water/sewage treatment, permeation/dialysis water/sewage treatment, etc. problems, to achieve the effect of easy integration and amplification, small footprint, and high aeration efficiency

Inactive Publication Date: 2012-07-11
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the aeration recovery process of desulfurized seawater is a gas-liquid contact process accompanied by chemical reactions,

Method used

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  • Film method aeration industrial flue gas desulfurization seawater recovery process
  • Film method aeration industrial flue gas desulfurization seawater recovery process
  • Film method aeration industrial flue gas desulfurization seawater recovery process

Examples

Experimental program
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Effect test

Embodiment 1

[0034] use as figure 1The shown membrane aeration industrial flue gas desulfurization seawater recovery process, the desulfurization core part of the device is composed of a first-stage hydrophobic hollow fiber column membrane module, which has a diameter of 90mm, an effective length of 900mm, and is filled with 5400 internal diameters of 400μm and an outer diameter of 500μm hydrophobic polypropylene hollow fiber membrane. The membrane filament is produced by melt spinning and stretching method, the maximum pore diameter ranges from 0.01 μm to 2.0 μm, and the wall thickness is 50 μm. The industrial flue gas desulfurization seawater is coal-fired flue gas desulfurization seawater, its pH value is 5.20, and its dissolved oxygen (DO) is 0mg / L. The oxygen-containing gas is compressed air, which is produced by an air compressor. The coal-fired flue gas desulfurization seawater A1 is mixed with fresh seawater through the water distribution area. The mixing ratio of fresh seawater ...

Embodiment 2

[0036] Using the same process, equipment and industrial flue gas desulfurization seawater as in Example 1 above, the oxygen-containing gas is pure oxygen, which is produced by an oxygen generator. Coal-fired flue gas desulfurization seawater A1 is mixed with fresh seawater through the water distribution area, the blending ratio is 3:1, and the seawater is adjusted to 0.6m through the corrosion-resistant pump 2 and the seawater flow control element 3 3 The flow rate of / h enters the 5 shell side of the hydrophobic hollow fiber membrane contactor. Pure oxygen B is produced by the oxygen steel cylinder 6, and the gas flow control element 7 is adjusted to make the pure oxygen flow at 0.08Nm 3 / h flow into the hydrophobic hollow fiber membrane contactor 5 tube side. The gas phase pressure is 70KPa, the liquid phase pressure is 30KPa, and the aeration time is 20s. Aeration restores the pH value of seawater A2 to 6.90, DO to 9.40mg / L, so as to meet the national seawater discharge st...

Embodiment 3

[0038] The same process, device, industrial flue gas desulfurization seawater and oxygen-containing gas are used as in the above-mentioned embodiment 1. Coal-fired flue gas desulfurization seawater A1 has a pH value of 2.70 and dissolved oxygen (DO) of 0mg / L. Coal-fired flue gas desulfurization seawater A1 is mixed with fresh seawater through the water distribution area. The blending ratio is 5:1. Pump 2, adjust the seawater flow control element 3 to make the seawater flow at 0.4m 3 The flow rate of / h enters the 5 shell side of the hydrophobic hollow fiber membrane contactor. The compressed air B is generated by the air compressor 6, and the gas flow control element 7 is adjusted to make the flue gas flow at 0.3Nm 3 / h flow into the hydrophobic hollow fiber membrane contactor 5 tube side. The gas phase pressure is 70KPa, the liquid phase pressure is 30KPa, and the aeration time is 20s. Aeration restores the pH value of seawater A2 to 6.91, DO to 4.03mg / L, so as to meet the...

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Abstract

The invention discloses a film method aeration industrial flue gas desulfurization seawater recovery process. Industrial flue gas desulfurization seawater sequentially passes through a water distribution area for mixing with fresh seawater, a noncorrosive pump, a seawater flow control element to enter a hydrophobicity hollow fiber absorber shell side (pipe side). Gas containing oxygen is generated through a gas source generation device, passes through a gas flow control element to enter a hydrophobicity hollow fiber absorber pipe side (pipe shell). A gas phase and a liquid phase are not directly contacted in a film contactor, and are separated by a hollow fiber film and independently controlled. The gas phase and the liquid phase form a stable mass transferring interface at the position of a micropore of the hollow fiber film by adjusting and controlling the gas flow control element and the seawater flow control element, the gas containing the oxygen enters the desulfurization seawater through the micropore of the film, sulfite of the desulfurization seawater is oxidized to generate stable sulfate, effects of sulfate fixation and seawater quality recovery are achieved. Compared with the prior art, the film method aeration industrial flue gas desulfurization seawater recovery process uses closed aeration and has the advantages of being free of SO2 escaping, high in efficiency, small in power consumption, small in land occupation, flexible in installation, convenient to integrate and magnify and the like.

Description

technical field [0001] The invention belongs to the intersecting field of waste water / sewage treatment technology and membrane separation technology. In particular, the invention relates to a process for recovering seawater quality from industrial flue gas desulfurization by using a hydrophobic hollow fiber membrane contactor for aeration. Background technique [0002] The flue gas discharged from boilers and kilns commonly used in electric power, chemical industry, metallurgy and other industries contains a large amount of sulfur dioxide (SO 2 ), it causes serious pollution to the atmosphere and is the main source of pollution that forms acid rain. Due to the need of environmental protection, industrial combustion contains SO 2 Before the flue gas is discharged into the atmosphere, some or most of the SO must be removed 2 , commonly known as the flue gas desulfurization process. [0003] In recent years, the rapid economic development in coastal areas has led to an incr...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/74C02F103/18
Inventor 陈颖郭春刚张召才关毅鹏刘国昌李晓明李浩
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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