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Multi-section membrane absorption flue gas desulfurization and decarburization method and device thereof

A membrane absorption and flue gas technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of poor selective absorption effect, low reusability of absorption liquid, low product utilization rate, etc. The effect of dust pollution self-cleaning ability, low energy consumption required for desorption, and less thermally stable salts

Active Publication Date: 2020-07-14
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention is in order to solve the problem of simultaneously containing SO in the prior art 2 and CO 2 In the process of desulfurization and decarburization of SO2 gas, there are problems such as poor selective absorption effect, low product utilization rate, and low reusability of absorption liquid. 2 and CO 2 The method of desulfurization and decarbonization of gas

Method used

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  • Multi-section membrane absorption flue gas desulfurization and decarburization method and device thereof
  • Multi-section membrane absorption flue gas desulfurization and decarburization method and device thereof
  • Multi-section membrane absorption flue gas desulfurization and decarburization method and device thereof

Examples

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Effect test

Embodiment 1

[0063] use as figure 1 The flue gas combined desulfurization and decarbonization device and its process shown are used to treat the tail gas of a Claus process, and the tail gas flow rate is 10 m 3 / h, flue gas temperature is 20℃, SO 2 The volume fraction is 100ppm, CO 2 The volume fraction is 1 % (volume fraction). After dedusting by the flue gas pretreatment device, the flue gas flow control device enters the hydrophilic ceramic membrane contactor (membrane aperture 0.05 μm, contact angle 10°); the absorbent in the desulfurization section is 5wt% methyldiethanolamine, absorbing Agent flow rate 10 m 3 / h, after the desulfurization section treats tail gas SO 2 content dropped to 5ppm, CO 2 The content is about 1 % (volume fraction), and the desulfurization section has an effect on SO 2 The removal rate can reach more than 99%, and the CO 2 The removal rate is less than 1%; then enter the hydrophobic ceramic membrane contactor (membrane aperture 0.05μm, contact angle 90...

Embodiment 2

[0065] use as figure 1The flue gas combined desulfurization and decarbonization device and its process shown are used to treat the tail gas of a Claus process, and the tail gas flow rate is 200 m 3 / h, flue gas temperature is 100℃, SO 2 The volume fraction is 1000ppm, CO 2 The volume fraction is 10 % (volume fraction). After the dust is removed by the flue gas pretreatment device, the flue gas flow control device enters the hydrophilic ceramic membrane contactor (the membrane aperture is 1 μm, the contact angle is 50°); the absorbent in the desulfurization section is 15wt% sodium hydroxide solution, and the absorbent Flow 100m 3 / h, after the desulfurization section treats tail gas SO 2 content dropped to 8ppm, CO 2 The content is about 9.9% (volume fraction), and the SO 2 The removal rate can reach more than 99%, and the CO 2 The removal rate is 1%; then enter the hydrophobic ceramic membrane contactor (membrane pore size 3μm, contact angle 170°), the decarburization ...

Embodiment 3

[0070] In this example, the influence of different gas flow conditions on the absorption process of hydrophilic membranes and hydrophobic membranes is investigated. The membrane pore size of the hydrophilic ceramic membrane contactor is 0.05 μm, and the contact angle is 10°; the hydrophobic ceramic membrane contactor The membrane pore size is 0.05 μm, the contact angle is 140°, the gas temperature is 20°C, and the absorbent flow rate is 10 m 3 / h. 0.4mol / L NaOH solution was used as absorbent in the hydrophilic membrane and hydrophobic membrane respectively, the SO in the gas 2 The concentration is 1000 ppm (molar concentration), CO 2 The concentration was 10 % (molar concentration), and the effect of gas flow rate on the selectivity factor was studied. It was found that compared with the hydrophobic membrane, the SO in the hydrophilic membrane 2 With higher removal efficiency and absorption flux, CO 2 have lower removal efficiencies and absorption fluxes (eg image 3 and ...

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Abstract

The invention discloses a flue gas combined desulfurization and decarburization device adopting a multi-section membrane absorption method. The device comprises at least two sections of membrane absorption devices, the process is as follows: pretreated flue gas is firstly subjected to selective desulfurization by a desulfurization section hydrophilic ceramic membrane contactor, and then enters a decarburization section hydrophobic ceramic membrane contactor for rapid decarburization. The principle is as follows: under the driving of concentration gradient, SO2 is selectively absorbed and thenCO2 is rapidly absorbed by utilizing the property difference of hydrophilic and hydrophobic ceramic membranes and the reaction characteristic of an absorbent, so that extremely high desulfurization selectivity is shown, and finally, the purpose of combined desulfurization and decarburization of flue gas is achieved. The process avoids gas-liquid two-phase direct contact, has higher load capacity for high-temperature and high-pressure flue gas and an alkaline absorbent, has the outstanding advantages of flexibility in operation, compact structure and high integration, and is suitable for upgrading and reconstruction of desulfurization and decarburization processes of small and medium-sized coal-fired thermal power plants and other flue gas generation equipment.

Description

technical field [0001] The invention belongs to the intersecting field of air pollution control technology and membrane separation technology, and particularly relates to an industrial waste gas treatment device that utilizes a multi-stage ceramic membrane contactor and uses an organic alcohol amine solution as an absorbent to realize combined desulfurization and decarbonization of flue gas. Background technique [0002] As of the end of 2016, my country's thermal power installed capacity has reached 1.05 billion kilowatts, and coal-fired and natural gas-based thermal power generation still accounts for more than 70% of the total installed capacity. The combustion of such fossil fuels will produce a large amount of harmful smoke, which is emitted to The flue gas in the atmosphere contains various acid gases such as sulfur dioxide, hydrogen sulfide and carbon dioxide, which cause great harm to human health and the environment. . [0003] Traditional desulfurization and carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/62
CPCB01D53/78B01D53/504B01D53/502B01D53/62B01D2257/504B01D2258/0283Y02C20/40
Inventor 邱鸣慧徐鹏黄勇符开云孔祥力陈献富范益群
Owner NANJING UNIV OF TECH
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