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Water quality recovery method

A water quality and seawater technology, applied in chemical instruments and methods, seawater treatment, water/sewage treatment, etc., can solve problems such as large changes in sulfur content, system fouling and blockage, and difficulty in water quality recovery, to reduce power consumption, prevent Scaling, the effect of water quality recovery

Active Publication Date: 2011-03-09
BEIJING BOOTES ELECTRIC POWER SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, in many cases, the sulfur content in coal varies greatly. For example, the sulfur content in some coal mines in my country ranges from 0.1% to 10%. The content of sulfur dioxide is very high, and the absorbed sulfur dioxide can not be completely oxidized into sulfate after forming sulfite. During the operation, it is easy to cause fouling and blockage of the system due to sulfite, thus affecting the normal operation and maintenance of the desulfurization system of the power plant, especially Water Quality Restoration in Seawater Desulfurization Systems Brings Big Difficulties
Most of the previous methods are to aerate the mixed seawater. In China, only Xiamen Songyu Power Plant adopts two-stage aeration and oxidation of absorption tower and aeration tank, but there is no such method for sulfur dioxide after absorbing flue gas in this field. The method of selecting the aeration amount according to the water content, and selecting different aeration amounts according to the water quality, so as to effectively realize the restoration of water quality

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Embodiment 1

[0050] In this example, the design value OAF 0 =11000Nm 3 / h, read from the computer system (DCS) in the desulfurization operation control room: Q 1 =2×10 6 N m 3 / h, S 1 =800ppm, S 2 =30ppm and C'=8%, oxidizing gas adopts air, and the oxygen content in this place air is 21%, η a =0.2%, η f =33.3%, put the above conditions into the formula (4) to get

[0051] OAF ′ = 2 × 10 6 × ( 800 - 30 ) × 10 - 6 2 × 21 % - ...

Embodiment 2

[0056] For the method adopted in Example 1, increasing the sulfur content of coal, the SO in the flue gas 2 The content of increases accordingly, in this embodiment, read from DCS: Q 1 =2×10 6 N m 3 / h, S 1 =980ppm, S 2 =30ppm and C '=6%, other conditions are identical with embodiment 1, then bring into formula (4) to obtain

[0057] OA F ′ = 2 × 10 6 × ( 980 - 30 ) × 10 - 6 2 × 21 % - ...

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Abstract

The invention relates to a water quality reset method in a seawater flue gas desulfurization process, in particular to a selection method of water quality reset multilevel aeration in a desulfurization system of a coal-fired power plant. The method includes the adjustment on an aeration device according to the following formula (4). The in-time total oxidizing gas capacity OAF' required by forcedly oxidizing SO2 according the formula (4) is compared with the designed value OAF0 of the total oxidizing gas capacity required by forcedly oxidizing the SO2, so as to determine the running of the aeration treatment device, thereby different aeration quantities can be selected according to the sulphur content of different coals and the difference of the seawater quality. Through the method of theinvention, respective aeration or combined aeration can be effectively adopted, not only the requirements of complete oxidation and scale formation prevention can be satisfied, but also the adjustment can be performed according to the sulphur content in the coals and the difference of the seawater quality, the power consumption can be greatly reduced, and the cost of the equipment maintenance is lowered, thereby the water quality reset can be effectively realized.

Description

technical field [0001] The invention relates to a water quality recovery method in a seawater flue gas desulfurization process, in particular to a multi-stage aeration selection method for water quality recovery in a desulfurization system of a coal-fired power plant, which is suitable for eliminating acidic substances such as sulfur dioxide that can cause acid rain. Background technique [0002] In my country, coal-fired power plants occupy a large proportion in the power industry. Coal-fired flue gas contains a large amount of sulfur dioxide. The emission of sulfur dioxide not only affects air quality and endangers human health, but also is the direct cause of acid rain. Due to the needs of environmental protection, some or most of the sulfur dioxide must be removed from the flue gas emitted by coal-fired power plants before being discharged into the atmosphere, which is usually called flue gas desulfurization process. The removal of sulfur dioxide in the flue gas, but its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/58C02F103/08
Inventor 张妍吴树志
Owner BEIJING BOOTES ELECTRIC POWER SCI & TECH