System for purifying flue gas and recovering sulfur and technique

Abstract

The invention provides a flue gas purification and sulphur recovery system and a process, comprising an adsorber, a desorber, an adsorbent delivery system, a heat energy integrated recovery system and a carbon powder separation and recovery system; meanwhile, suitable processing methods are adopted. The adsorber adopts a single-device dual-section radial staggered moving bed shaped like a reversed u and selective wide spectrum purification; the desorber adopts an axial reflux moving bed to realize the integrated recovery and utilization of the heat energy, regeneration of the adsorbent and the recovery of sulphur resource; the adsorbent adopts dense phase pneumatic conveying, thus leading the system to run continuously and stably; the flue gas purification and the sulphur recovery are realized by the carbon-based column-shaped or sphere-shaped desulfurization and denitration adsorbent. The system effectively integrates the energy-saving, exhaust and consumption reduction and resource recovery and utilization together, and has the advantages of high-effect wide spectrum purification and sulphur resource recovery, good gas distribution, grain movement and low pressure reduction, integrated recovery and utilization of heat energy, delivering the absorbent with no mechanical parts, continuous and stable operation of system, saving equipment investment and operation expense, etc.

Description

technical field [0001] The invention is a method for treating SO in coal-burning flue gas, sintering machine flue gas, metal smelting waste gas, sulfuric acid production tail gas, waste incineration and fuel oil waste gas. 2 , NO x The moving bed resource flue gas purification and sulfur recovery system and process for broad-spectrum purification of heavy metal ions and harmful smoke dust belong to air purification and environmental protection equipment, chemical process technology and equipment. Background technique [0002] SO2 is contained in flue gas and waste gas discharged from coal-fired power plants, metal smelters, coal-fired boiler plants, waste incineration and fuel oil processes 2 , SO 3 , NO x , heavy metal ions, harmful smoke and dust, causing acid rain hazards, ozone layer destruction, greenhouse effect, photochemical smog, human health hazards, building corrosion, etc., seriously endangering human production and life, and causing huge economic losses. Glo...

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Problems solved by technology

The flue gas flux purified by the cross-flow moving bed adsorber with rectangular cross-section is lower than that of the cylindrical radial bed, and the centripetal and centrifugal motions are not clear; the particle layer of the cylindrical desulfurization moving bed adsorber is thicker, and the pressure drop is higher. The gas distribution components and particle movement control components need to be improved to improve the uniformity of axial gas distribution and reduce the particle wear rate and particle velocity gradient when moving down; the single-stage desulfurization of the adsorber leads to low utilization efficiency of the adsorbent, and the desulfurization rate and The flue gas treatment capacity needs to be improved; the heat supply efficiency of the desorber is not high, and the heat energy recycling function is not complete, resulting in partial heat energy loss; carbon-based adsorbents are transported by belt conveyors, bucket elevators, pneumatic conveyors or dump conveyors , coke powder separation adopts mechanical vibrating screening, which leads to high investment cost of equipment and great wear and tear on particles; although the upper and lower integrated devices of adsorption and regeneration save the floor area, the ability of the device to resist wind loads, earthquakes and other factors limits its height. , large-scale and improvement of flue gas treatment capacity; the stability, continuity and large-scale operation of the device need to be improved

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