A device and method for double-circuit flue gas purification
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A flue gas purification, double-loop technology, applied in the field of flue gas purification
Active Publication Date: 2017-12-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0006] Aiming at the deficiencies of the existing technology, the present invention intends to optimize and improve the traditional dual-loop system, and strive to realize the efficient, coordinated removal and resource utilization of multiple pollutants in coal-fired flue gas by optimizing the dual-loop system, thereby avoiding the original SCR denitrification System, activated carbon injection mercury removal system, ionic liquid carbon capture system and tail wet electrostatic precipitator and other series-level arrangement of flue gas pollutant control systems
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Embodiment 1
[0063] The first-stage absorption liquid: the mass concentration of potassium humate is 8wt%, and the pH is 10.
[0064] The second-stage absorption liquid: the mass concentration ratio of potassium humate and sodium chlorite is 8:0.1, and the pH is 9.
[0065] The reaction conditions of the double-loop flue gas purification system are shown in Table 2.
[0066] Table 2
[0067] condition
[0068] The flue gas is purified according to the above conditions, and it is detected that the desulfurization efficiency reaches 97%, the denitrification efficiency reaches 81%, the mercury removal efficiency reaches 86%, and the CO 2 , HCl and HBr removal efficiencies were 48%, 90% and 80%.
Embodiment 2
[0070] The first-stage absorption liquid: the mass concentration of potassium humate is 10wt%, and the pH is 11.
[0071] The second-stage absorption liquid: the mass concentration ratio of potassium humate and sodium chlorite is 6:0.5, and the pH is 8.5.
[0072] The reaction conditions of the optimized double-loop flue gas purification system are shown in Table 3.
[0073] table 3
[0074] condition
[0075] The flue gas is purified according to the above conditions, and it is detected that the desulfurization efficiency reaches 98%, the denitrification efficiency reaches 83%, the mercury removal efficiency reaches 90%, and the CO 2 , HCl and HBr removal efficiencies were 46%, 91% and 83%.
Embodiment 3
[0077] The first-stage absorption liquid: the mass concentration of potassium humate is 12wt%, and the pH is 12.
[0078] The second-stage absorption liquid: the mass concentration ratio of potassium humate and sodium chlorite is 6:0.3, and the pH is 8.
[0079] The reaction conditions of the optimized double-loop flue gas purification system are shown in Table 4.
[0080] Table 4
[0081]
[0082]
[0083] The flue gas is purified according to the above conditions, and it is detected that the desulfurization efficiency reaches 99%, the denitrification efficiency reaches 84%, the mercury removal efficiency reaches 88%, and the CO 2 , HCl and HBr removal efficiencies were 48%, 87% and 78%.
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Abstract
The invention relates to a double-loop flue gas purification device and method. Flue gas subjected to dust removal undergoes heat exchange of a heat exchanger and then enters a first-stage absorption tower to perform acid-base neutralization and absorb SO2, CO2, HCl and HBr, then the flue gas enters a second-stage absorption tower to perform multi-pollutant oxidation reaction, NO in the flue gas is converted into highly-charged NOx, Hg<0> is oxidized into Hg<2+>, the NOx and the Hg<2+> are absorbed and removed, and meanwhile the SO2, CO2, HCl and HBr are further absorbed and removed. First-stage absorption waste liquid supernate and second-stage absorption liquid are mixed to serve as the absorption liquid of the second-stage absorption tower, second-stage absorption is strengthened while secondary utilization, the precipitate of first-stage absorption waste liquid and the second-stage absorption liquid are fed into a liquid-solid separator to perform liquid-solid separation, humic acid crystals are obtained through solid phase drying and crystallization, a liquid phase is delivered to the heat exchanger to dissolve out salts through heating and drying of flue gas waste heat, including potassium sulfate, potassium nitrate, potassium nitrate, potassium carbonate and other agricultural fertilizers, and product resource utilization is achieved.
Description
technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a double-circuit flue gas purification device and method. Background technique [0002] In recent years, due to the substantial increase in the number of power station boilers, industrial boilers and civil boilers, the emission of coal-fired flue gas pollutants has shown explosive growth, resulting in frequent smog in my country, which seriously endangers people's health and the ecological environment. Coal combustion flue gas pollutants mainly include particulate matter, SO 2 , NOx, a small amount of HCl and HBr, trace heavy metals (Hg, As, etc.), and coal-fired flue gas also contains a large amount of greenhouse gases such as CO 2 and VOCs. For the above pollutants, most industrial boilers and civil boilers do not have mature flue gas pollution control technologies. [0003] Power plant boilers have adopted effective control measures for most of the...
Claims
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