Method and system for jointly desulfuration, denitration and demercuration by activated coke of moving bed

Abstract

The invention dislocates a method and a system for jointly desulfuration denitration and demercuration by activated coke of a moving bed. The method comprises the following steps of: S1, adding activated coke to a desulfuration demercuration reactor and a denitration demercuration reactor respectively, carrying out desulfuration, denitration and demercuration on smoke, and respectively measuring the SO2 and NOx concentrations and the smoke flow at a smoke inlet; S2, calculating the mass flow of the activated coke required for realizing the target desulfuration and denitration efficiency, and adjusting the real-time mass flow of the flowed and reacted activated coke; S3, sieving out the dust attached by the reacted activated coke and the carbon power generated by self-abrasion; S4, charging the sieved activated coke into an activated coke regenerating reactor to be reacted to obtain regenerated activated coke; and S5, adding the regenerated activated coke into the desulfuration demercuration reactor and the denitration demercuration reactor respectively, and carrying out the circulation of desulfuration, denitration and demercuration. The method can be used for timely adjusting the inflow and outflow mass flow of the activated coke of the desulfuration demercuration reactor and the denitration demercuration reactor, and removing mercury in the smoke.

Description

technical field [0001] The invention relates to a method and system for combined desulfurization, denitrification and demercuration of moving bed active coke, belonging to the technical field of flue gas purification. Background technique [0002] On July 29, 2011, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine jointly issued a new national emission standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants". Emission limits for NOx and Hg have been added. If desulfurization, denitrification and mercury removal devices are installed separately in coal-fired power stations, not only does it occupy a large area, but it also takes time and effort to operate and maintain. In addition, some industrial boilers in our country, such as sintering machines in iron and steel plants, have wide distribution, small capacity, and high pollution emissions, second only to power station boiler...

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Problems solved by technology

Domestic research on combined removal of activated coke was carried out relatively late. The Chinese patent "Moving Bed Flue Gas Desulfurization, Denitration and Dust Removal Process" with application number 200610017066.7 discloses a single-tower double-stage desulfurization, denitrification and mercury removal reactor, which cancels the Mitsui -The two-stage constriction design in the BF process makes the movement of the adsorbent smoother and reduces the clogging of the active coke; however, because the flow of the flue gas and the movement of the adsorbent particles are reversed, the bed resistance is increased and the flue gas treatment is limited In addition, this design causes ammonia and flue gas to mix unevenly

Application No. 201110356697.2 Patent "Activated Coke Flue Gas Desulfurization and Denitrification System and Process Method" in which the flue gas flow and the movement of adsorbent particles are cross-flow, which reduces the resistance of the flue gas, and the gas distributor is designed to solve the uneven mixing of ammonia However, the connection between the desulfurization tower and the denitrification tower is still designed with a constricted neck, which is likely to cause active coke blockage and forced shutdown

The patents with application numbers 201010546275.7 and 201010546285.0 respectively disclose a split-type desulfurization and denitrification tower and an integrated desulfurization and denitrification tower. The mechanical loss of active coke, and the denitrification tower is larger than the desulfurization tower, which is easy to cause the crystallization of ammonium sulfate and ammonium sulfite, reducing the denitrification efficiency

[0004] To sum up, the existing flue gas removal devices generally have the same volume as the desulfurization tower and the denitrification tower, or the denitrification tower is larger than the desulfurization tower volume, and the difference between desulfurization and denitration reaction time is not considered, because the denitrification reaction time is much shorter than that of the denitrification tower. desulfurization reaction time, so this setting is likely to cause high desulfurization efficiency and low denitrification efficiency, and the desulfurization and denitrification efficiencies cannot be adjusted separately, which limits the application range of the combined desulfurization and denitrification device; in addition, the existing flue gas denitrification The removal devices did not consider the removal of mercury in the flue gas

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