Circulating pretreatment system for carbon dioxide capture of coal-fired power plant

Abstract

The invention provides a circulating pretreatment system for carbon dioxide capture of a coal-fired power plant. The circulating pretreatment system comprises a water washing tower, a plurality of filler layer bodies disposed inside the water washing tower and distributed from bottom to top, a circulating water cooler, an automatic alkali adding device and a salinity adjustment device. In the pretreatment system, the combination of the filler layers is adopted to completely remove harmful substances such as dust and SO2 in flue gas, thereby improving the water washing efficiency and achievingthe purpose of reducing the temperature of the flue gas; the automatic alkali adding device and the salinity adjustment device are disposed outside the water washing tower, the alkaline adding amountcan be automatically adjusted according to the pH setting value of the circulating washing water so as to effectively remove the content of acidic substance in the soot, thereby guaranteeing the waterwashing effect of the flue gas; water can be automatically supplemented according to the salinity of the circulating washing water, and scaling due to excessive salinity is prevented. The circulatingpretreatment system for carbon dioxide capture of the coal-fired power plant is high in water washing efficiency and good in cooling effect, and automatic control of the pH value and salinity in circulating washing water is realized.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, more specifically, to a cycle pretreatment system for carbon dioxide capture in coal-fired power plants. Background technique [0002] As we all know, the greenhouse effect will cause the temperature on the earth to rise and the sea level to rise, which will destroy the balance of the ecosystem and even endanger human health and survival in severe cases. Carbon dioxide is the most important factor causing the greenhouse effect. According to statistics, the world emits up to 20 billion tons of carbon dioxide into the atmosphere every year due to the burning of fossil raw materials, and the carbon dioxide emitted by fossil fuel power plants accounts for 30% of the total carbon dioxide emissions. Timely and efficient capture of carbon dioxide in flue gas will greatly alleviate the greenhouse effect. [0003] The carbon dioxide capture process in coal-fired power plants ha...

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Problems solved by technology

[0004] The water washing tower is a device used to capture carbon dioxide in the prior art. The flue gas enters the interior through the bottom of the water washing tower, and flows out from the top of the tower after being sprayed and washed. In the washed flue gas, sulfur oxides, nitrogen oxides and other pollutants The content of carbon dioxide still cannot meet the requirements of the downstream carbon capture device, so the washing effect is not good

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