Carbon capturing multi-bypass adjustable system and method for pretreating flue gas of power plant

Abstract

The invention belongs to the technical field of decarburization for environment protection, particularly relates to carbon capturing multi-bypass adjustable system and method for pretreating flue gas of a power plant, which are suitable for cleaning and treating flue gas before capturing carbon dioxide in coal fuel gas of a power plant. In the system, two bypasses, i.e. a washing tower bypass flue and a coal flue gas bypass flue system, are arranged. The on and the off of the bypasses are controlled according to the contents of sulfur dioxide and nitric oxide so that the costs for cleaning and treating the flue gas can be reduced, and the effect for cleaning the flue gas is guaranteed. When a detection result shows that the contents of sulfur dioxide and nitric oxide in the flue gas in a coal flue gas inlet flue are less than the range of the designed treating capability of a washing tower, the flow and the concentration of a detergent poured into a detergent spray system is adjusted in real time so that the contents of sulfur dioxide and nitric oxide in the flue gas, which are treated by the washing power, are always maintained near a designed value, and thus, the operation cost of a flue gas cleaning and treating system is further optimized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and decarbonization, and in particular relates to a multi-bypass adjustable flue gas purification treatment device and a method thereof which are suitable for flue gas purification treatment before carbon dioxide capture of coal-fired flue gas in power plants. Background technique [0002] At present, the carbon capture and storage technology of coal-fired power plant flue gas is one of the most effective technical ways to achieve the goal of reducing greenhouse gas emissions in the future. This type of technology mostly adopts chemical absorption process, among which, due to the characteristics of absorption solvent and power plant coal-fired flue gas components in chemical absorption process, flue gas washing system is basically required to purify flue gas before carbon dioxide capture, and basically remove smoke Sulfur dioxide and nitrogen oxides in the gas, reducing the loss o...

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Problems solved by technology

[0004] At present, the disadvantage of the flue gas scrubbing system is: when the flue gas flow rate and the content of sulfur dioxide and nitrogen oxides fluctuate frequently within the design range before scrubbing, the flow rate and concentration of the circulating scrubbing solvent cannot be adjusted accordingly in real time, so that the scrubbing system cannot be economically optimized operation; when the sulfur dioxide and nitrogen oxide components of the flue gas before washing are far less than the design value, the flow rate and concentration of the circulating detergent cannot be adjusted accordingly in real time, resulting in a large loss of energy consumption in the operation of the washing system; when the sulfur dioxide and nitrogen oxide in the flue gas before washing When the concentration is much greater than the design value, the washing and purification capacity of the washing system cannot guarantee the flue gas purification treatment effect of the scrubber, thereby increasing the load of the subsequent flue gas fine purification process, and in severe cases, it will cause serious losses to the subsequent fine purification system and increase sharply The cost of carbon dioxide capture, in severe cases, will force the carbon dioxide capture device to shut down for protection, so that the continuous production of carbon dioxide products cannot be achieved

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