Circulating fluidized bed system for continuously treating organic waste gas

Abstract

The invention discloses a circulating fluidized bed system for realizing continuous treatment of organic waste gas and belongs to the field of environmental protection. The system comprises an adsorption device, a desorption device, an incineration device, a heat recovery device and an air supply system; the adsorption device is used for fluidizing adsorbent particles in a lifting pipe (12) and adsorbing VOCs gas components in organic waste gas; the desorption device is used for fluidizing adsorbent particles in a desorption chamber (15) and removing VOCs gas components, so that the adsorbentparticles are regenerated; the incineration device is used for incinerating concentrated waste gas generated by regeneration of the adsorbent particles; the heat recovery device is used for recoveringheat in high-temperature tail gas output by the incineration device and converging the tail gas subjected to heat exchange into a tail gas flue (27); and the air supply system is used for supplying organic waste gas to the adsorption device and providing desorption carrier gas to the desorption device. According to the system of the invention, the adsorbent particles in the adsorption device andthe desorption device are in a fluidized state, and therefore, the adsorption and desorption efficiency is high, a heat utilization rate is high, and long-term continuous stable treatment can be achieved.

Description

technical field [0001] The invention belongs to the field of organic waste gas treatment, in particular to a circulating fluidized bed system for realizing continuous treatment of organic waste gas. Background technique [0002] Volatile Organic Compounds (VOCs) include non-methane hydrocarbons, oxygen-containing organics, chlorine-containing organics, nitrogen-containing organics, sulfur-containing organics, etc. harm. VOCs come from a wide range of sources and are generated during production, transportation or storage in petrochemical, transportation, printing, painting, pharmaceutical, furniture and other industries. my country's environmental protection departments have also put forward increasingly stringent requirements for the management of VOCs in various industries. [0003] There are many VOCs treatment technologies, including adsorption method, absorption method, thermal oxidation method, biodegradation method, low-temperature plasma method, photocatalysis metho...

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Problems solved by technology

However, the activated carbon tower in this process needs to be cyclically switched between adsorption and desorption, which is inconvenient to operate, and there is a potential risk of local overheating and ignition of activated carbon

Utility model patent CN208694621U discloses a zeolite runner-catalytic combustion system for treating organic waste gas. The regeneration gas preheating unit is equipped with furnace gas mixing and direct heating after combustion waste heat exchange, which improves the utilization rate of combustion heat energy, but the In the system, the adsorption area and the desorption area are the same part, and there is still the problem of alternating heating and cooling of the equipment, and there are moving parts

However, additional heating pipes are arranged in the desorption fluidized bed, which increases energy consumption and increases the flow resistance in the bed, which increases the power consumption of the fan; no gas-solid separation device is arranged on the desorption fluidized bed, so that the powdery There is overflow loss of adsorbent particles; the high-temperature adsorbent particles returned after desorption are first returned to the adsorbent storage tank for storage without loose wind, which may easily cause blockage of powdered adsorbent and heat accumulation to catch fire

[0007] In addition, the fluidized bed system, especially the circulating fluidized bed system, inevitably has adsorbent particle wear and overflow loss, and the above patents also fail to provide a good method for timely replenishment of materials

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