A ceramic membrane condensation treatment and recovery method for waste heat and water of flue gas in power plant

A flue gas waste heat and recovery method technology, which is applied in the direction of steam condensation, separation methods, chemical instruments and methods, etc., can solve problems such as dew point corrosion, and achieve the effect of simplifying the process flow and effectively utilizing water resources

Active Publication Date: 2016-04-13
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention mainly solves the problem of dew point corrosion in the existing waste heat recovery method, and at the same time reduces the operating cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The flue gas with a large amount of water vapor in a power plant with an exhaust gas temperature of 70°C passes through an 8nm single-tube alumina ceramic membrane separation device, and the membrane surface velocity is controlled to be 0.032m·s -1 , the transmembrane pressure difference is 0.45MPa, and the flow rate of circulating water on the permeate side is 2.5L h -1 , to detect the temperature change before and after the flue gas passes through the ceramic membrane, and the change of the water temperature and water quality on the circulation side after the water vapor condenses and passes through the ceramic membrane.

[0018] Among them, the flue gas composition before separation: CO 2 : 11-16%, H 2 O: 5-7%, O 2 : 3-4%, N 2 : 70-75%, CO: ~20ppm, SOx: <800ppm, NOx: 500-800ppm, temperature: 45~120℃. After the separation, the water vapor component in the flue gas is reduced. Since the loss of the remaining water vapor component is less than 4% to 6%, the remainin...

Embodiment 2

[0026] The flue gas with a large amount of water vapor in a power plant with an exhaust gas temperature of 110°C passes through a 5nm single-tube alumina ceramic membrane separation device, and the membrane surface velocity is controlled to be 0.048m·s -1 , the transmembrane pressure difference is 0.4MPa, and the flow rate of circulating water on the permeate side is 2.5L h -1 , to detect the temperature change before and after the flue gas passes through the ceramic membrane, and the change of the water temperature and water quality on the circulation side after the water vapor condenses and passes through the ceramic membrane. The water vapor recovery rate can reach 16%, and the energy recovery rate can reach 12%.

Embodiment 3

[0028] The flue gas with a large amount of water vapor in a power plant with an exhaust gas temperature of 50°C passes through a 12nm single-tube alumina ceramic membrane separation device, and the membrane surface velocity is controlled to be 0.048m·s -1 , the transmembrane pressure difference is 0.2MPa, and the flow rate of circulating water on the permeate side is 25L h -1 , to detect the temperature change before and after the flue gas passes through the ceramic membrane, and the change of the water temperature and water quality on the circulation side after the water vapor condenses and passes through the ceramic membrane. The water vapor recovery rate reaches 10%, and the energy recovery rate is lower than the detection limit of 5%.

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Abstract

The invention relates to a ceramic membrane condensation treatment recycling method for smoke waste heat and water of a power plant. The method comprises the following steps: treating smoke with a great amount of vapor in the power plant through a ceramic membrane separation device, recycling vapor and heat of the vapor permeating a membrane through a membrane condensation technology, bringing out recycled water through circulating water on the permeation side, and heating the circulating water on the permeation side by recycled heat; and discharging gas, which does not permeate the membrane, into the atmosphere, wherein the ceramic membrane in the ceramic membrane separation device is a hydrophilic ceramic nano filter membrane. By the ceramic membrane condensation treatment recycling method, the process flow is simplified, and the problem of corrosion of exposed points can be avoided; the energy recycling rate can reach 18 percent, the water recycling rate also reaches 12 percent, and a water resource is effectively utilized.

Description

technical field [0001] The invention relates to a treatment and recovery method of flue gas, and more specifically relates to a ceramic membrane condensation treatment recovery method for waste heat and water of flue gas in a power plant. Background technique [0002] At present, the waste heat recovered and utilized in China mainly comes from the sensible heat of high-temperature flue gas and the combustible gas discharged during the production process. The medium and low-temperature waste heat, that is, low-grade waste heat, has basically not been recovered. Therefore, making full use of waste heat resources has become an important factor for enterprises to save energy. Compared with high-grade energy such as coal, oil, and natural gas, the flue gas generated after combustion (mainly referring to low-grade waste heat) contains very low energy in the same unit and is difficult to utilize. [0003] At present, the common low-temperature waste heat recovery technology is heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D69/02B01D71/02B01D5/00
CPCY02P70/10
Inventor 漆虹王婷婷
Owner NANJING TECH UNIV
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