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Method and device for removing hazardous substances in Pu'er tea production smoke

A technology for harmful substances and flue gas, which is applied to the field of flue gas generated in the Pu'er tea process, can solve the problems of high production cost, cannot be regenerated, cannot be used, etc., and achieves the effects of stable dust removal efficiency, reduced replacement cost, and simple structure.

Inactive Publication Date: 2018-09-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method uses porous materials to remove polycyclic aromatic hydrocarbons and other harmful components through physical adsorption and chemical adsorption. This technology has no secondary pollution and is easy to operate. Chen Xiangming and others used the hydrothermal method to synthesize Fe in patent CN 106111070. 3 o 4 Magnetic microspheres are coated with dopamine and modified with bis-mercapto compounds. The prepared adsorbent has a strong adsorption capacity for PAHs in spirulina, and the adsorption recovery rate reaches 78.4%-107.1%. However, the The production cost of the adsorption material is relatively high, it cannot be regenerated, and cannot be used in actual production
Low-temperature plasma technology generates hydroxyl radicals, superoxide radicals and H through high-voltage discharge. 2 o 2 Oxidizing particles such as oxidizing particles further oxidize and decompose PAHs. This technology has a strong broad spectrum and can effectively degrade polycyclic aromatic hydrocarbons. However, low-temperature plasma needs to be injected at 150KJ / m 3 The above energy has high energy consumption and produces a large number of harmful by-products, which cannot be applied to actual production
Catalytic oxidation is the use of catalysts to oxidize and decompose PAHs at high temperatures. This technology has high removal efficiency and no secondary pollution. Shi Jianwen and others used γ-AL in patent CN 101804348 A 2 o 3 As a carrier, with Pb / Ce / Pt and V as active components, it can degrade PAHs into carbon dioxide and water at 200-400°C, and the degradation rate is 99.0%. higher
The biological treatment method is that under suitable conditions, microorganisms use organic pollutants as carbon sources to oxidize organic matter into CO 2 and H 2 O, the treatment technology is simple, effective, and easy to operate, but the premise of this treatment technology is that the organic matter to be treated must be water-soluble so that it can be easily degraded by microorganisms, and PAHs are poor in water solubility and are not suitable for large-scale use of microorganisms. deal with

Method used

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  • Method and device for removing hazardous substances in Pu'er tea production smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The device for completing the above method is as figure 1 As shown, it includes a flue 1, a bag filter 4, a clean air chamber 5, and an oil-absorbing resin column 7. The flue 1 is provided with a flue gas inlet 12, and the lower part of the flue 1 is provided with three fly ash injection ports 2. A set of baffles 3 is provided at the exit of channel 1, the ash discharge port 10 is arranged at the exit of the flue 1 and below the baffle 3, the ash discharge flap 9 is provided at the entrance of the ash discharge port 10, and the ash discharge port 10 is arranged at the exit of the flue 1 1 The outlet is connected to the inlet of the bag filter 4, and the clean air chamber 5 is set at the flue gas outlet of the bag filter. There is an exhaust port 11, and the bag filter 4 is equipped with a bag filter dust discharge port 8, the bag filter adopts polyphenylene sulfide surface filter material, the air-to-cloth ratio is 0.5m / min, and the oil-absorbing resin column 7 is a fix...

Embodiment 2

[0031] In a handmade Puer tea production base, during the production process of Puer tea, an earthen stove was used to burn firewood for greening. The smoke generated by firewood combustion is the main factor affecting the quality of Puer tea; the temperature of the smoke is 86 ℃, and the total PAHs are 31μg / m 3 , the four-hexacyclic PAHs accounted for 33% of the total PAHs, the PAHs below the tetracyclic ring accounted for 67% of the total PAHs, and the volatile phenol content was 19mg / m 3 , NOx is 8 mg / m 3 , no heavy metal mercury and sulfur dioxide were detected, and the flue gas flow rate was 30m 3 / h, the main component of soot is carbon particles with a particle size of 0.4μm-10μm.

[0032] The structure of the device used in this example is the same as in Example 1; the difference is that the bag filter adopts polyphenylene sulfide surface filter material, the air-to-cloth ratio is 1.0m / min, and the lower part of the flue 1 is provided with 2 fly ash injection ports 2...

Embodiment 3

[0036] A handmade tea production base uses earthen stoves to burn plant straws for greening. The smoke produced by burning straws is the main factor affecting the quality of Pu-erh tea. The flue gas temperature is 90 ℃, and the total PAHs is 13 μg / m 3 , the four-hexacyclic PAHs accounted for 14% of the total PAHs, the PAHs below the tetracyclic ring accounted for 86% of the total PAHs, and the volatile phenol content was 8mg / m 3 , NOx is 5mg / m 3 , no heavy metal mercury and sulfur dioxide were detected, and the flue gas flow rate was 40m 3 / h, the main component of soot is carbon particles, the particle size is 0.6μm-8μm;

[0037] The structure of the device used in this example is the same as in Example 1; the difference is that the bag filter adopts polyphenylene sulfide surface filter material, the air-to-cloth ratio is 0.8m / min, and the lower part of the flue 1 is provided with 4 fly ash injection ports 2 ;

[0038] After the above flue gas is adsorbed by modified fly ...

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Abstract

The invention discloses a method and device for removing hazardous substances in Pu'er tea production smoke. The method specifically comprises the steps that smoke produced by a Pu'er tea production process is adsorbed by adopting modified fly ash, meanwhile the modified fly ash and smoke dust collide and agglomerate with water drops in the smoke; then, a deflection baffle makes mixed airflow change direction, sedimentation of agglomerates and large particulate matter is caused, residual small particulate matter is filtered out by a bag-type dust collector, and residual polycyclic aromatic hydrocarbons and small organic molecules of the airflow are adsorbed by oil-absorptive resin. On the premise that economy and environmental protection are considered, it is achieved that the removal rateof polycyclic aromatic hydrocarbons and other hazardous substances in Pu'er tea production smoke is 98% or above by adopting the method.

Description

technical field [0001] The invention relates to the treatment of flue gas produced in the Pu'er tea process, and more specifically relates to a method and device for removing polycyclic aromatic hydrocarbons and other harmful substances in the flue gas produced in the Pu'er tea production process. Background technique [0002] The traditional processing steps of Yunnan Pu’er tea are: cooling → curing → kneading → drying → autoclaving → drying. In the curing section, high temperature is used to inhibit enzyme activity and polyphenol oxidation, and part of the water is evaporated. In addition, the autoclaving section uses coal as the The heat source generates steam to steam the tea leaves to achieve the purpose of molding. In the above two process links, both small workshops and large-scale enterprises mostly use coal or firewood as the heat source. However, polycyclic aromatic hydrocarbons, small molecular organic compounds, sulfur dioxide, and nitrogen oxides are inevitably ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/10B01D53/04B01D53/00B01D50/00
CPCB01D53/002B01D53/04B01D53/10B01D2257/302B01D2257/40B01D2257/602B01D2257/7027B01D50/20
Inventor 太志刚宋庆和李振杰刘志华朱瑞芝
Owner KUNMING UNIV OF SCI & TECH