A combined removal of heavy metals, voc and SO from coal-fired flue gas 3 system and method
A coal-fired flue gas, combined removal technology, applied in the field of flue gas purification, can solve the problem of high cost
Active Publication Date: 2021-03-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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At present, brominated activated carbon is mainly used in the industry as an adsorbent. Although its adsorption efficiency is high, the cost is relatively high.
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[0074] The application also provides a combined removal of heavy metals, VOC and SO in coal-fired flue gas 3 The above-mentioned system can be a specific embodiment of the method. The method includes the following steps:
[0075] S1, after the biomass is carried out metal loading by the metal loading device 21, it is sent into the pyrolysis furnace 22 for pyrolysis;
[0076] The metal-loaded biomass can be a mixture of metal oxides and biomass. The metal oxides can catalyze the oxidation of heavy metals in the flue gas and generate divalent heavy metals. The generated divalent heavy metals can be absorbed and reacted through the wet desulfurization tower 15, and can also Can catalyze the oxidation of VOC and generate CO 2 and H 2 O, generated CO 2 and H 2 O is exhausted through the chimney 16, while also being able to combine with SO 3 react and produce sulfate. Moreover, the biochar generated after the biomass is pyrolyzed in the pyrolysis furnace 22 has a large specif...
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Abstract
This application relates to the technical field of flue gas purification, in particular to a joint removal of heavy metals, VOC and SO in coal-fired flue gas 3 systems and methods. The system includes a first system and a second system. The first system includes a boiler, a denitrification device, an air preheater, a dust collector and a wet desulfurization tower in sequence along the flow direction of flue gas. The second system sequentially includes a boiler along the direction of biomass transport. Including metal loading device, pyrolysis furnace, first separation device, biochar storage device and injection pipeline. In this application, after the biomass is loaded with metal by the metal loading device, it is sent to the pyrolysis furnace for pyrolysis, and the biochar separated by the first separation device is stored by the biochar storage device, and the biomass stored in the biochar storage device The carbon is sprayed into the flue through the injection pipe, and the metal-loaded biochar can effectively absorb heavy metals, VOC and SO 3 , so as to realize the heavy metals, VOC and SO in the flue gas 3 joint removal.
Description
technical field [0001] This application relates to the technical field of flue gas purification, in particular to a joint removal of heavy metals, VOC and SO in coal-fired flue gas 3 systems and methods. Background technique [0002] Heavy metals refer to chemical density greater than 4.5g / cm 3 Heavy metals, such as Hg, Cd, Pb, etc., are highly toxic and cause serious harm to organisms and the environment even at low concentrations. Coal-fired power plants are one of the important sources of heavy metal emissions, so it is urgent to strictly control the emissions of heavy metals from coal-fired power plants. [0003] Volatile organic compounds, referred to as VOC, are also one of the pollutants produced in the coal combustion process. If they are not treated and discharged directly into the atmosphere, they will cause serious harm to the human body. [0004] SO 3 It is a serious pollutant. With the increasingly stringent emission control of air pollutants, SO 3 Emission...
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IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/10F23J15/02C10B53/02C10B57/06
CPCB01D53/10B01D2257/302B01D2257/60B01D2257/708B01J20/20B01J20/28009C10B53/02C10B57/06F23J15/003F23J15/006F23J15/02F23J2215/10F23J2215/20F23J2215/60F23J2219/30Y02E50/10Y02P20/129Y02C20/40
Inventor 汪涛薛逢皇王家伟张永生潘伟平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)