Device for desulfurizing flue gas by seawater through membrane absorption and its process

A desulfurization device and membrane absorption technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of uneven distribution of absorption liquid and flue gas, difficult to achieve engineering applications, and high operation and maintenance costs. The effect of high seawater utilization rate, stable desulfurization efficiency, strong resistance to flue gas SO2 concentration and flow shock capacity

Inactive Publication Date: 2012-06-06
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dry and semi-dry processes need to consume a large amount of absorbent, and produce solid by-products, which cause heavy equipment wear and high operation and maintenance costs.
Mature wet processes include seawater method and limestone-gypsum method. Compared with limestone-gypsum method, seawater method can save a lot of fresh water consumed for preparing absorption liquid, but due to the use of traditional gas absorption equipment (such as packed tower, liquid column tower and still cannot get rid of the common problem of wet flue gas desulfurization: due to the direct contact between the gas-liquid two-phase during the flue gas absorption process, the process is vulnerab

Method used

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  • Device for desulfurizing flue gas by seawater through membrane absorption and its process
  • Device for desulfurizing flue gas by seawater through membrane absorption and its process
  • Device for desulfurizing flue gas by seawater through membrane absorption and its process

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Embodiment 1

[0100] Use as figure 1 The membrane absorption method of seawater flue gas desulfurization process shown, the core part of the device desulfurization is composed of three levels such as Picture 11 The box-type gas-liquid contact membrane absorber shown is assembled in series and installed horizontally. The hollow fiber membrane filling area of ​​each level of membrane absorber is 500m 2 , The membrane packing density is about 9%; raw seawater is used as the absorption liquid, the conductivity is 47400μS / cm~51800μS / cm, the pH value is 7.45~8.22, and the temperature is normal temperature; when the actual coal-fired flue gas is used, its SO 2 Concentration 1000mg / Nm 3 ~1600mg / Nm 3 , Smoke and dust concentration 100mg / Nm 3 , The temperature is 130℃~150℃, before entering the membrane absorber, it will be cooled to below 50℃ through the heat exchanger. Control the total flow of seawater 5m 3 / h~25m 3 / h, using parallel mode to flow through the 3-stage membrane absorber, seawater flows...

Embodiment 2

[0102] Using the same process, equipment and absorbing liquid as the above example 1, the flue gas is SO 2 The concentration is 2860mg / Nm 3 And 4290mg / Nm 3 High-concentration actual coal-fired flue gas, and control the seawater flow to 15m 3 / h, pH value is 8.20~8.51, flue gas treatment capacity is 500Nm 3 / h~1300Nm 3 / h, the corresponding concentration is 2860mg / Nm 3 The desulfurization rate is 97.7%~88.5%, the pH value of seawater after desulfurization is 3.3~5.5; the corresponding concentration is 4290mg / m 3 The flue gas, the flue gas treatment capacity ≤1000Nm 3 / h, the desulfurization rate is 97.1% to 90.6%, and the pH value of seawater after desulfurization is 2.7 to 5.0. Flue gas SO 2 The concentration is 1000mg / Nm 3 ~4290mg / Nm 3 Fluctuating within the range, flue gas processing volume≤1000Nm 3 / h, the desulfurization rate is above 90%. The membrane fouling control of the gas phase and the liquid phase, and the post-treatment of the cleaning seawater and the desulfurized s...

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Abstract

The invention discloses a device for desulfurizing flue gas by seawater through membrane absorption and its process, the flue gas is sent to a membrane absorber shell side by a supercharging blower fan, the pretreated seawater enters in a membrane absorber tube side through a sea water pump and is taken as absorption liquid, gas phase and liquid phase form a reaction interface at the micropore ofa hollow fiber membrane, SO2 in flue gas is reacted with seawater to generate sulfite and timely is taken away for realizing the flue gas desulphurization. Desulfurized seawater is discharged throughaeration sulfur fixation and pH value standard achieving. The device of the invention is composed of a one stage or multistage membrane absorber, the membrane absorber is composed of multi-group curtain type or column type hollow fiber film component group. The process has the characteristics of low air resistance of the device, small power consumption and high desulphurization efficiency. A design of an automatic on-line backwashing and cleaning technology is capable of controlling and mitigating membrane pollution, the device possesses small volume and light weight, and enables modularized integration; the flow velocity of the gas phase and the liquid phase can be independently controlled in a wide scope, and the problem of device corrosion caused by entrainment water vapor in flue gas in a traditional seawater method can be avoided.

Description

Technical field [0001] The invention belongs to the cross field of air pollution control technology and membrane science and technology application, and specifically relates to a system that uses seawater as an absorption liquid and adopts membrane absorption technology to remove sulfur dioxide in flue gas. Background technique [0002] The sulfur dioxide in the atmosphere mainly comes from the combustion of industrial waste gas, coal and petroleum and other fossil fuels. At present and for a long period of time in the future, the use of coal to provide heat and power resources is still the mainstream in China. In recent years, the rapid economic development in coastal areas has increased the economic burden caused by power shortages, resulting in rapid development of coastal thermal power, which currently accounts for about one-third of the total installed capacity of thermal power. SO emissions from the power industry 2 It accounts for about 50% of the country's total emission...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/18
Inventor 陈颖关毅鹏刘国昌郭春刚张召才李晓明李雪梅吕经烈
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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