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A waste gas treatment method for dynamic fluidized bed staged adsorption that realizes high efficiency and energy saving

A high-efficiency, energy-saving, waste gas treatment technology, applied in separation methods, gas treatment, chemical instruments and methods, etc., can solve the problems of lack of broad-spectrum adsorption, high operating costs, and fast desorption cycles, and reduce thermal desorption. Potential safety hazards, improving desorption efficiency, and reducing the effect of effective life

Active Publication Date: 2022-03-04
上海环境保护有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the removal of organic waste gas containing acid gas, the pretreatment form of alkali washing and spraying is often used, which leads to high humidity and high water vapor content of organic waste gas after pretreatment and acid removal, which is not conducive to adsorption, resulting in low treatment efficiency of organic waste gas, and the method will be Produce secondary pollutants - waste water
Moreover, the current adsorption method has a single adsorbent, and only uses activated carbon, zeolite, resin, silica gel and other materials for adsorption. Organic adsorbents such as activated carbon have good adsorption effects and have broad-spectrum adsorption properties.
However, due to its nature as organic matter, safety accidents are prone to occur in the thermal desorption regeneration process, the operating cost of steam desorption or nitrogen desorption is high, and hazardous waste is generated
The adsorption capacity of molecular sieves or resins is low, and the adsorbent is easily saturated, resulting in a fast desorption cycle, and these two adsorbents have high adsorption performance for specific organic substances, but do not have broad-spectrum adsorption

Method used

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  • A waste gas treatment method for dynamic fluidized bed staged adsorption that realizes high efficiency and energy saving
  • A waste gas treatment method for dynamic fluidized bed staged adsorption that realizes high efficiency and energy saving
  • A waste gas treatment method for dynamic fluidized bed staged adsorption that realizes high efficiency and energy saving

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Effect test

Embodiment 1

[0034] Exhaust gas working condition: exhaust air volume 100Nm 3 / h, the exhaust gas contains 30mg / m of hydrogen chloride 3 , butyl acetate 100mg / m 3 , toluene 50mg / m 3 , This project requires the exhaust gas treatment device to have a treatment efficiency of more than 90% for various pollutants.

Embodiment approach

[0035] Implementation plan: use dry calcium carbonate adsorption method + molecular sieve system adsorption (thermal desorption combustion) + activated carbon system adsorption (steam desorption condensation) to treat waste gas. First, the exhaust gas enters the first-stage adsorption bed, and the adsorption bed is filled with granular calcium carbonate with a particle size of 8 mm. After the exhaust gas is reacted in the alkaline adsorption bed, hydrogen chloride is removed, and the surface of the granular calcium carbonate reacts with hydrogen chloride to form calcium chloride. The bottom surface reacts The calcium carbonate is transported to the surface grinder through the bottom conveyor, and the surface grinder strips the calcium chloride on the surface from the calcium carbonate particles, and after recovering the ability to absorb acid gas, it is transported to the primary adsorption bed through the screw feeder.

[0036] After the exhaust gas passes through the first-st...

comparative approach 1

[0039] Comparison scheme 1: Alkaline washing spray tower + replaceable activated carbon is used for treatment. The alkali washing spray tower absorbs hydrogen chloride through lye, and the organic matter is discharged after being adsorbed by activated carbon. The saturated activated carbon is treated as hazardous waste.

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Abstract

The invention discloses a high-efficiency and energy-saving dynamic fluidized bed graded adsorption waste gas treatment method, which relates to the field of waste gas purification. Acid gas, volatile organic gas and specific types of volatile organic gases are mixed to form mixed waste gas. The mixed gas After entering the first adsorption bed system, the second adsorption bed system and the third adsorption bed system and other multi-stage adsorption reaction systems in turn, they are purified respectively, and then discharged through the exhaust fan and the exhaust pipe. In the present invention, the above-mentioned components cooperate with each other to realize the purification treatment of mixed waste gas containing acid gases and different volatile organic compounds (VOCs), which effectively prolongs the service life of high-efficiency adsorbents, has a high degree of automation, saves energy consumption in system operation, and greatly reduces the generation of hazardous waste At the same time, the method and device involved in the present invention have reasonable structure, long service life, high efficiency, energy saving, safety and environmental protection.

Description

technical field [0001] The invention relates to the field of waste gas purification, in particular to a waste gas treatment method for realizing high-efficiency and energy-saving dynamic fluidized bed staged adsorption. Background technique [0002] There are many ways to treat volatile organic waste (VOCs). Adsorption has the advantages of high efficiency, low energy consumption, simple operation, and recyclability, so it has become one of the common ways to deal with VOCs. In addition, in the treatment of organic waste gas with large air volume and low concentration, it also acts as a pretreatment function for enrichment. [0003] For the removal of organic waste gas containing acid gas, the pretreatment form of alkali washing and spraying is often used, which leads to high humidity and high water vapor content of organic waste gas after pretreatment and acid removal, which is not conducive to adsorption, resulting in low treatment efficiency of organic waste gas, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/12B01D53/83B01D53/40F23G7/06
CPCB01D53/12B01D53/40B01D53/83F23G7/06B01D2259/414B01D2259/402B01D2259/4009B01D2258/02B01D2257/708
Inventor 张心良吴娅李久奎徐广钊王智杰张逸飞李明广施政戴晓波吴志平
Owner 上海环境保护有限公司
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