A method for continuous treatment of organic waste gas based on circulating fluidized bed system

Abstract

The invention discloses a continuous treatment method for organic waste gas based on a circulating fluidized bed system, which belongs to the field of environmental protection. The steps of the method are as follows: the organic waste gas to be treated fluidizes the adsorbent particles in the riser, and the adsorbent particles adsorb the VOCs gas components in the organic waste gas; The adsorbent particles fall into the desorption chamber; the desorption uses a high-temperature carrier gas to fluidize the adsorbent particles in the desorption chamber and desorb the VOCs gas components attached to the adsorbent particles, thereby regenerating the adsorbent particles and returning them to lift tube; the concentrated waste gas containing high-concentration VOCs gas carrying some adsorbent particles is separated from gas and solid, and the concentrated waste gas enters the incineration device and is incinerated and oxidized to be degraded into harmless high-temperature exhaust gas. in the flue. The method of the invention makes the adsorbent particles in a fluidized state, and has high adsorption and desorption efficiency and high heat utilization rate.

Description

technical field [0001] The invention relates to the field of organic waste gas treatment, in particular to a method for continuous treatment of organic waste gas based on a circulating fluidized bed system. 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, photocatalys...

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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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