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Method for treating waste gases containing CS2 and H2S mixed pollutants

A pollutant and exhaust gas technology, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of inability to realize the recovery of useful resources, achieve the effects of reducing energy consumption, simplifying the process, and improving adsorption capacity

Active Publication Date: 2018-06-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-temperature plasma and adsorption coupling technology are widely used in the removal of VOCs, but generally, the adsorbent is filled in the low-temperature plasma reactor to enhance the degradation of VOCs by plasma, or the adsorption saturation of adsorption by low-temperature plasma is used. Regeneration of reagents cannot achieve the recovery of useful resources

Method used

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  • Method for treating waste gases containing CS2 and H2S mixed pollutants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, one for processing containing CS 2 and H 2 The process system of S mixed waste gas, including adsorption towers 4 and 5, low-temperature plasma treatment device 6 and lye absorption tower 7 connected in sequence, the adsorption tower 4 and the adsorption tower 5 are connected in parallel, and the adsorption and desorption processes are alternated on the two towers The switching of the adsorption and desorption processes of the two adsorption towers is automatically controlled by the PLC program. The bottom of the adsorption towers 4 and 5 is provided with an exhaust gas inlet 1, an induced draft fan 2 and an emptying device 3, and the tops of the adsorption towers 4 and 5 are provided with The water vapor enters the end 8, and the adsorption tower 4 is filled with polystyrene-based ultra-high cross-linked adsorption resin; a primary condenser 9 and a secondary condenser 10 are arranged between the adsorption tower 4 and the low-temperature pl...

Embodiment 2

[0038] Handle CS 2 with H 2 The exhaust gas of S mixture, the main parameters are: induced draft fan air volume 80CMH, CS 2 Intake concentration 5g / m 3 , H 2 S concentration 1000mg / m 3 The inlet temperature is normal temperature and the pressure is normal pressure; the diameter of the adsorber is DN=180mm, the adsorbent is ultra-high cross-linked adsorption resin NDA-150 resin, the filling height is H=300mm, the adsorption time is 90min, and the water vapor desorption time is 60min. The condenser uses circulating water at normal temperature, and the secondary condenser uses 5°C frozen brine; the low-temperature plasma adopts corona discharge mode, the voltage is 25kV, and the frequency is 20MHz; the absorption liquid is NaOH solution with a concentration of 5wt%. After the waste gas is treated by the integrated process, the CS in the exhaust gas 2 with H 2 S was not detected, and CS was recovered from the sump for 24 hours 2 9.3Kg, the recovery rate is 96.9%.

Embodiment 3

[0040] The adsorbent in embodiment 2 is changed into macroporous adsorption resin AMBERLITE TM XAD-4, other conditions remain unchanged. CS in exhaust gas 2 The concentration is 103mg / m 3 , the processing efficiency is 97.94%, H 2 S concentration was not detected. Total recovery of CS in the sump for 24 hours 2 6.9Kg, the recovery rate is 71.9%.

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Abstract

The invention discloses a method for treating waste gases containing CS2 and H2S mixed pollutants and belongs to the technical field of waste gas treatment. Aiming at waste gases containing CS2 and accompanying with traced H2S discharged in the production process in industries such as synthetic fibers, leather, pharmacy and the like, a treatment method adopting an adsorption-low temperature plasmaoxidation-absorption integrated process is disclosed. A hyper-cross-linked polymeric adsorbent has high selective adsorption capacity on the CS2, the CS2 can be recovered by 99% or higher, and wasteof resources is avoided; and due to low temperature plasma, the trace H2S and CS2 can be efficiently oxidized into CO2, H2O and SO2, foul odor in the waste gas can be completely eliminated, and the SO2 in the tail gas is absorbed with alkali liquor, so that the H2S, CS2 and SO2 can achieve complete up-to-standard discharge.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and in particular relates to the CS-containing 2 and H 2 The treatment method of S waste gas, more specifically, involves an adsorption-low temperature plasma oxidation-absorption integrated process to treat 2 and H 2 S exhaust method. Background technique [0002] In the production process of synthetic fiber, leather, pharmaceutical and other industries, a large amount of CS containing 2 with a small amount of H 2 The exhaust gas of S, both of which are odorous substances with a low threshold, will cause damage to the human sense of smell and nervous system, so it is necessary and urgent to effectively treat this type of exhaust gas. For this type of exhaust gas, the existing treatment methods all have certain defects. Such as the Claus oxidation method, the principle is to incompletely burn the sulfide and convert the sulfur element into elemental sulfur. This process has certain requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/32B01D53/14
CPCB01D53/02B01D53/1468B01D53/1487B01D53/323B01D2259/818B01D2252/10B01D2253/20
Inventor 龙超刘笑寒马佳凯刘慧娟张健
Owner NANJING UNIV
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