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Agent for absorbing fire coal flue gas mercury pollutant and preparation and use thereof

A technology for coal-fired flue gas and pollutants, applied in separation methods, chemical instruments and methods, and other chemical processes, to achieve low production costs, high adsorption efficiency, and wide application range

Active Publication Date: 2008-11-12
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the deficiencies in the current coal-fired flue gas mercury pollutant treatment technology, the primary purpose of the present invention is to provide a coal-fired flue gas mercury pollutant adsorbent, which can not only effectively adsorb and remove the mercury pollutants in coal-fired flue gas mercury pollutants, the removal rate of mercury pollutants in the flue gas is 20% to 70% or higher, and the raw material of the adsorbent is easy to get (dewatered sludge from urban sewage plants), the preparation method is simple, the price is low, and the production Much lower cost than existing activated carbons

Method used

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  • Agent for absorbing fire coal flue gas mercury pollutant and preparation and use thereof
  • Agent for absorbing fire coal flue gas mercury pollutant and preparation and use thereof
  • Agent for absorbing fire coal flue gas mercury pollutant and preparation and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of coal-fired flue gas mercury pollutant adsorbent comprises the following steps:

[0038] 1) Take a certain amount of dewatered sludge from urban sewage plants, add sawdust additive with a mass fraction of 1.5%, stir evenly, then add solid zinc chloride powder 1 times the weight of dry sludge, stir evenly, and let stand for 24 hours.

[0039] 2) Put the static dewatered sludge into the muffle furnace, heat it under the condition of isolating the air, control the heating rate at 15°C / min, raise the temperature to 175°C and dry for 1.5h, and then heat up to the activation temperature of 550°C ℃, the pyrolysis and carbonization time is 2 hours; after cooling in the system state, the dewatered sludge pyrolysis and carbonization products are obtained.

[0040] 3) Rinse the pyrolysis and carbonization product once with 3mol / L hydrochloric acid to remove impurities and metal oxides, then rinse it with 80°C distilled water until the pH is 7.0, and then b...

Embodiment 2

[0045] The preparation process of the coal-fired flue gas mercury pollutant adsorbent is the same as in Example 1, and some process parameters in the process are changed, and the steps and parameters of the change are as follows:

[0046] Step 1): the dosage of sawdust additive is changed to 2%, the dosage of solid zinc chloride powder is 1.5 times the weight of dry sludge, and the standing time is changed to 36h.

[0047] Step 2): heat up to 200°C at a heating rate of 30°C / min and dry for 1.0 h, then heat up to an activation temperature of 700°C, and pyrolysis and carbonization for a certain time of 0.5 h;

[0048] Step 3): The pyrolysis carbonized product was first rinsed twice with 2mol / L hydrochloric acid, then rinsed with 90°C distilled water until the pH was 6.5, and then baked at 120°C for 18 hours.

[0049] Step 4): immerse the adsorbent A in a potassium bromide solution with a concentration of 2mol / L, the solution volume is determined according to 0.55ml per gram of a...

Embodiment 3

[0052] The preparation technological process of adsorbent is identical with embodiment 1, changes some technological parameters in the process, and the steps of change and parameter are as follows:

[0053] Step 1): the dosage of sawdust additive is changed to 1%, the dosage of solid zinc chloride powder is 0.5 times the weight of dry sludge, and the standing time is changed to 12h.

[0054] Step 2): heat up to 150°C at a heating rate of 10°C / min and dry for 2.0 hours, then heat up to an activation temperature of 400°C, and pyrolysis and carbonization for a certain time of 3.0 hours;

[0055] Step 3): The pyrolysis carbonized product was rinsed three times with 1 mol / L hydrochloric acid, then rinsed with 70°C distilled water until the pH was 6.0, and then baked at 100°C for 30 hours.

[0056] Step 4): Put the adsorbent A in a tube furnace, raise the temperature to 175°C at 15°C / min, feed in hydrogen bromide and helium as a carrier gas, and react at constant temperature for 3 h...

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Abstract

The present invention discloses an adsorbent for mercury pollution in coom smoke gas, a modified adsorbent thereof, and the preparation and application thereof. By employing the dewatered sludge from the city sewage processing factory as material, the adsorbent for mercury pollution in coom smoke gas is obtained after steps of dipping in chemical medicament, stirring and placing, pyrolysis and charring, and washing and drying. Furthermore, the modified adsorbent obtained by filtering modified element in the surface of the adsorbent can enhance the specific adsorption and the adsorption capability of the mercury of the material, and reduce the used amount of the absorption material. The adsorbent, the modified adsorbent and the compound prepared by the present invention can be used in treatment of the mercury pollution in coom smoke gas in different general operating manners. The adsorbent and the modified adsorbent prepared by the present invention have convenient material source, low production cost, facility application, and remarkable circumstance and economy benefit.

Description

technical field [0001] The invention relates to a coal-fired flue gas mercury pollutant adsorbent, a preparation method and application thereof. Background technique [0002] Mercury pollution is one of the most concerned environmental problems at home and abroad, and mercury emissions from coal-fired power plants are generally considered to be the largest source of mercury pollution. In December 2000, the U.S. Environmental Protection Agency announced that it would begin to control the emission of mercury in the flue gas of coal-fired power plant boilers, and proposed a draft control standard for mercury emissions from coal-fired power plant boilers in early 2004. Emission Control Standard (CAMR-Clean AirMercuryRule), becoming the first country in the world to implement a limit standard for mercury emissions from coal-fired power stations, and will fully implement the standard before the end of 2007. At the same time, other developed countries in the world (such as Canada,...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01D53/04
Inventor 岑超平方平唐志雄陈定盛
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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