A flue gas multiple aeration desulfurization and denitrification system and control method

A technology of desulfurization, denitrification and aeration, which is applied in the direction of separation method, self-adaptive control, general control system, etc., can solve the problems of lower pH value of alkaline wastewater and high cost of alkaline wastewater treatment, and achieve the effect of reducing treatment cost

Active Publication Date: 2015-08-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] One of the objectives of the present invention is to provide a flue gas multiple aeration desulfurization and denitrification system, which uses the chemical reaction between alkaline wastewater and flue gas to remove high-valence nitrogen oxides and sulfur oxide pollutants in the flue gas, and Reduce the PH value of alkaline wastewater, aiming to solve the problem of high cost of existing flue gas desulfurization and denitrification and alkaline wastewater treatment

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  • A flue gas multiple aeration desulfurization and denitrification system and control method
  • A flue gas multiple aeration desulfurization and denitrification system and control method

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Embodiment

[0046] In order to fully react the alkaline wastewater with the sulfur oxides and nitrogen oxides in the flue gas, the discharged flue gas meets the emission standards. First, through a large number of experiments, the relationship between the temperature of the alkaline waste liquid, the pH value of the alkaline waste liquid, the liquid level of the alkaline waste liquid, the spraying speed of the alkaline waste liquid, the flow rate of the flue gas and the composition of the exhausted flue gas is obtained; On-line data analysis establishes a fuzzy control model; finally, the system monitors the temperature of alkaline waste liquid in the flue gas desulfurization and denitrification device of alkaline wastewater in real time, the pH value of alkaline waste liquid, and the change of flue gas flow rate, and controls the change of alkaline waste water. The height of the liquid level, the replacement of alkaline waste liquid, and the spraying speed of alkaline waste liquid can rea...

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Abstract

The invention discloses a flue gas repeated aeration desulfurization and denitrification system which comprises a tower body, a basic solution tank, a recycling tank, a smoke passage, a chimney, a monitoring device, an executive device, a computing control device and two aeration rooms, wherein each aeration room comprises an aeration tank and a spraying rack. The invention further discloses a fuzzy control method for the flue gas repeated aeration desulfurization and denitrification system. The fuzzy control method comprises the following steps: step 1, generating a fuzzy control model rule list; step 2, adjusting and controlling the liquid level height of alkali wastewater in the aeration tanks; step 3: adjusting and controlling the water flow of spraying passages. Through the utilization of the alkali wastewater to perform flue gas desulfurization and denitrification treatment, the cost of the flue gas desulfurization and denitrification in the prior art is reduced.

Description

technical field [0001] The invention relates to the field of coal-fired boiler flue gas treatment technology and automatic control, in particular to a flue gas multiple aeration desulfurization and denitrification system and a fuzzy control method. Background technique [0002] Coal is the main fuel for thermal power generation in my country. The sulfur oxides and nitrogen oxides produced in the coal combustion process have caused increasingly serious harm to the atmospheric environment in my country. The commonly used flue gas desulfurization method is the lime / limestone-gypsum wet method, which has relatively high efficiency. However, domestic research on this technology has not yet made a breakthrough. At present, the system is mainly imported from Japan, and 70% of small and medium-sized boiler enterprises in my country cannot afford the massive infrastructure investment and high operating costs of the commonly used desulfurization process. In addition, low-grade gypsum...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/60G05B13/00
Inventor 郭华芳李家杰尹华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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