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Algae-char-impact-tower-based mercury removal method and preparation method of algae char

A seaweed coke and mercury removal technology, applied in separation methods, chemical instruments and methods, coke ovens, etc., can solve problems such as lack of research on adsorbent stability and adsorption mechanism, inability to obtain large-scale industrial applications, and unbearable for enterprises. Achieve the effect of no secondary pollution, wide source and simple process

Inactive Publication Date: 2015-03-25
南京朗洁环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most researched and most mature activated carbon adsorption method has high mercury removal efficiency, but the application cost is extremely high, which is unaffordable for enterprises.
Other adsorbents, such as precious metals, metal oxides, fly ash, activated coke, calcium-based materials, molecular sieves and natural mineral materials, have potential development prospects, but due to the application cost, mercury removal efficiency, adsorbent stability and adsorption Insufficient and insufficient in mechanism research and other aspects, it is still unable to obtain large-scale industrial application
In summary, there is currently no coal-fired flue gas mercury removal technology suitable for large-scale commercialization.

Method used

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  • Algae-char-impact-tower-based mercury removal method and preparation method of algae char
  • Algae-char-impact-tower-based mercury removal method and preparation method of algae char
  • Algae-char-impact-tower-based mercury removal method and preparation method of algae char

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Dry the seaweed naturally in a ventilated state and chop it into 100-mesh seaweed powder, then put it into a temperature-controlled stirring tank, stir with water at 60°C for 2 hours, and repeat five times. Water and nitric acid were used as a mixed solvent (the mass percent of nitric acid in the mixed solvent was 10%), stirred at 40° C. for 6 hours, filtered, and then the seaweed was naturally dried for 240 hours in a ventilated state. The naturally dried seaweed was dried in a temperature-controlled drying oven at 105° C. for 8 hours to obtain anhydrous seaweed. Anhydrous seaweed is crushed into seaweed powder with a particle size of 100 mesh and placed in a tube furnace. Under a mixed atmosphere of CO2 and N2 with a volume ratio of 1:2, it is pyrolyzed at 500°C for 15 minutes, cooled to room temperature, and seaweed is obtained. Production of biomass char. The biomass coke made from seaweed was crushed into 100 mesh particles, soaked in ammonium metavanadate solutio...

Embodiment 2

[0061] Dry the seaweed naturally in a ventilated state and chop it into 100-mesh seaweed powder, then put it into a temperature-controlled stirring tank, stir with water at 80°C for 2 hours, and repeat five times. Water and nitric acid were used as a mixed solvent (the mass percent of nitric acid in the mixed solvent was 20%), stirred at 60° C. for 6 hours, and after filtering, the seaweed was naturally dried for 240 hours under ventilated conditions. The naturally dried seaweed was dried in a temperature-controlled drying oven at 105° C. for 8 hours to obtain anhydrous seaweed. Anhydrous seaweed is crushed into seaweed powder with a particle size of 100 mesh and placed in a tube furnace, under a mixed atmosphere of CO2 and N2 volume ratio of 1:1, pyrolyzed at 500°C for 15 minutes, cooled to room temperature to obtain seaweed Production of biomass char. The biomass coke made from seaweed was crushed into 100-mesh particles, soaked in a 5% sodium metavanadate solution for 12 h...

Embodiment 3

[0063] The seaweed was naturally dried under ventilation and chopped into 150-mesh seaweed powder, then put into a temperature-controlled stirring tank, stirred with water at 80°C for 2 hours, and repeated five times. Water and nitric acid were used as a mixed solvent (the mass percent of nitric acid in the mixed solvent was 25%), stirred at 80°C for 6 hours, filtered, and the seaweed was naturally dried for 240 hours in a ventilated state. The naturally dried seaweed was dried in a temperature-controlled drying oven at 105° C. for 8 hours to obtain anhydrous seaweed. Anhydrous seaweed is crushed into seaweed powder with a particle size of 100 mesh and placed in a tube furnace. Under a mixed atmosphere of CO2 and N2 with a volume ratio of 1:2, it is pyrolyzed at 700°C for 15 minutes, cooled to room temperature, and seaweed is obtained. Production of biomass char. The biomass coke made from seaweed was crushed into 150 mesh particles, soaked in 10% sodium metavanadate solution...

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Abstract

The invention relates to an algae-char impact-tower-based mercury removal method. The method comprises the following steps: performing pyrolysis on algae to prepare biomass char as a flue gas mercury removal adsorbent, and adsorbing and removing mercury in one impact tower reactor; recycling mercury resource and regenerating the adsorbent in a separator; cooling mercury-containing flue gas from a burner and spraying the flue gas into the impact tower reactor through a Laval spray pipe, spraying the algae char adsorbent into the impact tower reactor through the Laval spray pipes which are coaxially and oppositely arranged, and enabling two strands of gas flows to have opposite impact in the impact tower reactor so as to realize the adsorption and removal of mercury. When regeneration is performed in one impact tower reactor, flue gas from the burner is automatically switched and flows into the other impact tower reactor. The two impact tower reactors are alternatively used for performing regeneration. According to the method and the device, the biomass char is prepared by utilizing pyrolysis of algae and used for adsorbing and removing mercury, the removal process has no secondary pollution, the raw material of the adsorbent is a regenerative resource with wide reserves, and wide application prospects can be achieved.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a seaweed coke-based impingement tower mercury removal method and a preparation method of seaweed coke. Background technique [0002] Mercury is a highly toxic and easily deposited heavy metal trace element in organisms, which is extremely harmful to human health and the ecological environment. According to a survey report published by the United Nations Environment Program, coal-fired boilers are the largest anthropogenic pollution source of mercury emissions. my country is the world's largest coal consumer, and the proportion of coal in the energy structure is as high as 75%, and this pattern will not change significantly for a long period of time in the future. With the increasingly stringent air environmental protection standards for coal-fired pollutants, it is expected that the release of mercury pollution control standards for coal-fired flue gas will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/06B01J20/20B01J20/30C10B53/02C10B57/06
CPCY02E50/10
Inventor 刘杨先张军王燕
Owner 南京朗洁环保科技有限公司
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