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Low-temperature moving bed integrated adsorption desulfurization and denitrification system

An adsorption desulfurization and moving bed technology, applied in gas treatment, chemical instruments and methods, membrane technology, etc., can solve the problems of low denitrification rate of activated coke, inability to meet ultra-clean emissions, high regeneration temperature, etc., and reduce water consumption of power plants , less loading, and lower loss of adsorbent

Pending Publication Date: 2020-08-07
CHINA HUANENG GRP CO LTD +1
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Problems solved by technology

The denitrification rate of activated coke is not high, generally only 70-80% denitrification efficiency, which cannot meet the requirements of ultra-clean emissions
In addition, since the activated coke dry desulfurization principle is based on H 2 SO 4 Chemical adsorption, high regeneration temperature, and active coke participates in the regeneration reaction, resulting in large losses

Method used

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  • Low-temperature moving bed integrated adsorption desulfurization and denitrification system

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Embodiment

[0023] as attached figure 2 As shown, after the flue gas is pressurized by the flue gas induced draft fan 1, it enters the flue gas waste heat recovery device 2, and the flue gas temperature drops from 120°C to 70°C; the flue gas at 70°C enters the flue gas cooling system 3, and is cooled by spraying way down to -20°C. The flue gas cooling system 3 adopts a three-stage spray cooling method: the first stage is cooled to 35°C by spraying, the second stage is cooled to 5°C by chilled water spray, and the third stage is cooled by spraying low-temperature calcium chloride solution to -20°C, the first spray circulating fluid is cooled by cooling water, the second spray circulating fluid is cooled by a chiller; the third spray circulating fluid (calcium chloride solution) is cooled by a low-temperature refrigeration unit. The low-temperature flue gas cooled to -20°C by the flue gas cooling system 3 enters the low-temperature moving bed adsorption tower 4. In the embodiment, the low...

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Abstract

The invention discloses a low-temperature moving bed integrated adsorption desulfurization and denitrification system. A flue gas input pipeline containing SO2 and NOx is communicated with an inlet ofa flue gas waste heat recoverer through a flue gas induced draft fan; the outlet of the flue gas waste heat recoverer is communicated with the inlet of the flue gas cooling system; the outlet of theflue gas cooling system is communicated with the flue gas inlet of the low-temperature moving bed adsorption tower; a porous adsorbent outlet in the bottom of the low-temperature moving bed adsorptiontower is communicated with the inlet of the desorption tower, a porous adsorbent outlet of the desorption tower is communicated with a porous adsorbent inlet in the top of the low-temperature movingbed adsorption tower, and the gas outlet of the low-temperature moving bed adsorption tower is communicated with the inlet of a cold energy recoverer; the flue gas cooling system adopts a three-section spray cooling structure, the system can meet the requirement of ultra-clean emission, the desorption temperature is lower, and meanwhile, the adsorbent loss is lower.

Description

technical field [0001] The invention belongs to the technical field of flue gas integrated desulfurization and denitrification, and relates to a low-temperature moving bed integrated adsorption desulfurization and denitrification system. Background technique [0002] The current mainstream desulfurization and denitrification technologies are SCR denitrification and FGD desulfurization. SCR denitrification is to reduce NOx to N through catalyst and reducing agent 2 discharge, limestone-gypsum method for desulfurization, the method by the SO 2 React with limestone slurry to generate insoluble calcium sulfate (gypsum) for removal. Although traditional SCR denitrification and FGD desulfurization technologies are widely used, there are many problems. For example, FGD desulfurization uses a large amount of limestone as a desulfurization agent. Extensive mining of limestone causes serious mountain damage, and FGD desulfurization produces a large amount of desulfurization wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04
CPCB01D53/0407B01D53/0438B01D2257/302B01D2257/40
Inventor 汪世清郜时旺王绍民蒋敏华肖平黄斌
Owner CHINA HUANENG GRP CO LTD
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