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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 the direction of separation methods, chemical instruments and methods, and other chemical processes, to achieve high adsorption efficiency, low production cost, and wide application range

Active Publication Date: 2010-08-11
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
Comparison scheme
Effect test

Embodiment 1

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

[0038] 1) Take a certain amount of dewatered sludge from a municipal wastewater treatment plant, add sawdust additive with a mass fraction of 1.5%, and mix well, then add solid zinc chloride powder of 1 times the weight of the dry sludge, mix well, and let stand for 24 hours.

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

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

Embodiment 2

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

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

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

[0048] Step 3): The pyrolysis carbonized product is rinsed twice with 2mol / L hydrochloric acid, then rinsed with distilled water at 90°C to a pH of 6.5, and then baked at 120°C for 18h.

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

Embodiment 3

[0052] The preparation process of the adsorbent is the same as in Example 1. Some process parameters in the process are changed, and the changing steps and parameters are as follows:

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

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

[0055] Step 3): The pyrolysis carbonized product is first rinsed with 1mol / L hydrochloric acid 3 times, then rinsed with distilled water at 70°C to a pH of 6.0, and then baked at 100°C for 30h.

[0056] Step 4): Put the adsorbent A into a tube furnace, heat up to 175°C at 15°C / min, pass in hydrogen bromide and pass in the carrier gas helium, and react at a constant temperature for 3 hours to obtain a 1% bromine-co...

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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, lowproduction cost, facility application, and remarkable circumstance and economy benefit.

Description

Technical field [0001] The invention relates to a coal-burning flue gas mercury pollutant adsorbent, and a preparation method and application thereof. Background technique [0002] Mercury pollution is currently one of the most concerned environmental issues 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 start to control mercury emissions from coal-fired power plant boiler flue gas, and proposed a draft mercury emission control standard for coal-fired power plant boilers in early 2004. On March 15, 2005, the U.S. Environmental Protection Agency issued mercury emissions. The emission control standard (CAMR-Clean AirMercuryRule) has become the first country in the world to implement a limit standard for mercury emissions from coal-fired power plants. The standard will be fully implemented by the end of 200...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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