Membrane condensation method of gas dehumidification

A gas and condensed water technology, applied in the field of separation, can solve the problems of lower heat recovery rate and lower water vapor recovery efficiency, and achieve the effects of avoiding reheating, improving membrane permeation rate, and reducing pipeline corrosion.

Active Publication Date: 2019-12-10
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above method recovers the saturated water vapor in the flue gas by means of membrane separation, but as the recovery proceeds, the temperature difference between the flue gas side and the circulating water side gradually decreases, and the driving force of the condensed water from the flue gas side to the circulating water side If it is lowered, the recovery efficiency of water vapor in the flue gas will decrease, and the heat recovery rate will also decrease; therefore, it is of great significance to propose a membrane separation method that can maintain the water recovery rate for energy saving, emission reduction, and economic benefit improvement.

Method used

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  • Membrane condensation method of gas dehumidification

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Embodiment 1

[0041] This embodiment provides a film condensation method for dehumidification of flue gas in a smelter. The schematic flow chart of the film condensation method is as follows figure 1 shown, including the following steps:

[0042] (1) The water vapor in the humid gas with a temperature of 200°C and a relative humidity of 100% is condensed and transferred through the membrane, and the condensed water is recovered by the driving solution on the liquid side of the membrane; wherein, the humid gas and the driving solution flow countercurrently , the film surface flow velocity of the wet gas is 1m / s, the flow velocity of the driving solution is 3m / s, and the driving solution is a NaCl solution with a temperature of 16°C and a concentration of 1.5mol / L; the wet gas is a smelter flue gas;

[0043] (2) The drive solution after recovery of condensed water is concentrated to a KCl concentration of 1.5 mol / L by means of distillation and / or reverse osmosis, and is recycled as a drive s...

Embodiment 2

[0045] This embodiment provides a membrane condensation method for dehumidifying coal-fired power plant boiler tail gas after desulfurization, and the method includes the following steps:

[0046] (1) The water vapor in the humid gas with a temperature of 80°C and a relative humidity of 90% is condensed and transferred through the membrane, and the condensed water is recovered by the drive solution on the liquid side of the membrane; wherein the wet gas and the drive solution flow countercurrently , the film surface flow velocity of the wet gas is 0.5m / s, the flow velocity of the driving solution is 1m / s, and the driving solution is seawater with a temperature of 21°C; the wet gas is desulfurized coal-fired power plant boiler tail gas;

[0047] (2) The driving solution after recovering the condensed water enters the reverse osmosis seawater desalination device to produce pure water, and the recovered water can be used as tap water.

Embodiment 3

[0049] This embodiment provides a film condensation method for dehumidification of reheated boiler tail gas, the method comprising the following steps:

[0050] (1) Water vapor in a humid gas with a temperature of 150°C and a relative humidity of 60% is condensed and transferred through the membrane, and the condensed water is recovered by the drive solution on the liquid side of the membrane; wherein the wet gas and the drive solution flow countercurrently , the membrane surface flow velocity of the wet gas is 2.5m / s, the flow velocity of the driving solution is 5m / s, and the driving solution is seawater desalination reverse osmosis concentrated water with a temperature of 20°C; the wet gas is reheated boiler tail gas ;

[0051] (2) The driving solution after recovery of condensed water passes through the heat exchanger to recover heat, and then it is used as the feed water of the reverse osmosis seawater desalination device to produce pure water, and the concentrated water e...

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Abstract

The invention relates to a membrane condensation method of gas dehumidification. The membrane condensation method comprises the following steps that water vapor in wet gas is condensed and transferredthrough a membrane, condensed water is absorbed by a driving solution on the liquid side of the membrane through osmotic pressure driving force, and thus the transferring process is enhanced. Under the action of the osmotic pressure driving force of the driving solution, the condensed water can be efficiently transferred, and thus the efficient dehumidification of the gas is achieved. According to the membrane condensation method, the water vapor in the wet gas can be efficiently recovered, according to the different humidity of the gas, the water recovery rate can be up to 85%, and the heatrecovery rate can be up to 90%. Flue gas of a power plant is taken as an example, the flue gas can be efficiently dehumidified, thus the water recovery can be achieved, reheating is avoided, pipelinecorrosion is reduced, the purposes of energy conservation and emission reduction are achieved, environmental protection is achieved, and economic benefits of the enterprise can be improved.

Description

technical field [0001] The invention belongs to the field of separation, and relates to a gas-liquid separation method, in particular to a membrane condensation method for gas dehumidification. Background technique [0002] The flue gas discharged from the wet desulfurization process of coal-fired power plants carries huge latent heat and contains saturated water vapor. Kim J F et al. published an article entitled Harnessing Clean Water from Power Plant Emissions Using Membrane Condenser Technology in ACS Sustainable Chemistry & Engineering (2018), 6(5):6425-6433, which pointed out that if the flue containing saturated water vapor can be If more than 20% of the moisture in the gas is recovered, self-sufficiency in water for power plant boilers can be realized. Peng Yueyu pointed out in an article titled Research on Moisture Recovery and Utilization of Coal-fired Boiler Flue Gas that, taking a 600MW coal-fired boiler unit as an example, if the condensate recovery rate can re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/26
CPCB01D53/265B01D2258/0283B01D2257/80
Inventor 赵帅飞杜娟郑春苗
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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