Regeneration technology simultaneously achieving dry desulfurization, denitrification and demercuration by means of formula adsorbent

An adsorbent and formula technology, which is applied in the field of devices adopting formula-type adsorbent recycling and regeneration technology, can solve the problems of large investment in equipment cost, secondary pollution of waste liquid, and rare process methods, so as to save investment cost and reduce Operating cost and the effect of enhancing recycling utilization

Inactive Publication Date: 2017-03-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The patent "A method and system for simultaneous desulfurization, denitrification and mercury removal of flue gas based on catalytic oxidation" (patent application number: CN102527205A) applied by the Electric Power Research Institute of Guangdong Power Grid Corporation, in which the flue gas is firstly dedusted by a bag filter, Then through the catalytic reaction device, NO and Hg 0 Oxidation to NO 2 and Hg 2+ , and finally use the spray method to remove SO in the flue gas 2 , NO 2 , Hg 2+ , the equipment cost of this system is large, and it will produce secondary pollution such as waste liquid
[0010] To sum up: In recent years, there are many invention patents on simultaneous desulfurization, denitrification and mercury removal at home and abroad, but there are few processes that can simultaneously desulfurize, denitrify, demercure and regenerate adsorbents

Method used

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  • Regeneration technology simultaneously achieving dry desulfurization, denitrification and demercuration by means of formula adsorbent
  • Regeneration technology simultaneously achieving dry desulfurization, denitrification and demercuration by means of formula adsorbent

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Embodiment 1

[0063] Grind the columnar active coke to 150 mesh, wash the screened active coke powder with deionized water three times, dry it in an oven at 110°C for 12 hours, and store it in a drying dish for use.

[0064] Will Fe 3 o 4 3 g, 90 mL of toluene and 10 mL of 3-mercaptopropyltrimethoxysilane (3-MPTS) were mixed and stirred, and the resulting suspension was placed in an oven and dried at 25°C to form a white solid precipitate. The precipitate from the above steps was mixed with 90 mL of distilled water and Na 2 SiO 3 Mix and stir 1mL, then separate and remove the solution with a magnet, wash twice with deionized water to obtain Fe 3 o 4 Silicon coating (DSLC-Fe 3 o 4 ) 4g.

[0065] Zeolite 6g is dispersed in toluene 90mL, the Fe of above-mentioned step 3 o 4 Add 4 g of the silicon coating to toluene and stir, alternately wash twice with a certain amount of ethanol and distilled water to remove the toluene, heat the resulting solid at 300° C. for 1 hour, and grind it i...

Embodiment 2

[0069] The regeneration process system of the formula type adsorbent of the present invention simultaneously dry desulfurization, denitrification and mercury removal includes three parts: an adsorber reaction system, a bag filter purification system, and an adsorbent regeneration cycle system.

[0070] The specific process is as figure 2 As shown, the coal-burning flue gas first enters the reaction chamber through the bottom inlet of the adsorption reactor and fully reacts with the formula-type adsorbent prepared in Example 1 sprayed on the top, and the Hg in the flue gas 0 Trapped by silver nanoparticles on the surface of the adsorbent, NO x by the SCR catalyst via NH 3 catalytic reduction to N 2 , SO 2 Physically adsorbed by activated coke, in the bag filter, the adsorbent carried by the flue gas will form an adsorption layer on the surface of the filter bag, and the Hg 0 , SO 2 , NO x Secondary adsorption, the flue gas after adsorption is discharged from the chimney....

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Abstract

The invention discloses a regeneration technology simultaneously achieving dry desulfurization, denitrification and demercuration by means of a formula adsorbent. The regeneration technology is characterized in that an active coke formula magnetic silver-supported zeolite-supported SCR catalyst is adopted as the adsorbent, flue gas passes through an adsorption reactor, and meanwhile the adsorbent is sprayed into the adsorption reactor from the top of the adsorption reactor; Hg<0>, SO2 and NOx in the flue gas are fully mixed and generate a reaction with the formula adsorbent; a flue gas mixture obtained after a pre-reaction enters a bag-type dust collector, a stable adsorbent precipitation layer is formed on the surface of a filter bag of the bag-type dust collector, and the formula adsorbent continues to remove SO2, NOx and Hg<0> on the precipitation layer; the magnetic formula adsorbent obtained after adsorption can be regenerated. According to the regeneration technology, the advantages of being high in removal rate, low in energy consumption needed by a system and low in equipment cost and operation cost are achieved, the separated adsorbent is higher in purity and better in cyclic utilization effect, and operation of the system is more stable and reliable.

Description

technical field [0001] The invention relates to a kind of NO in flue gas produced by industrial coal combustion x , SO 2 , Hg 0 The combined removal method of the invention, especially the device and method using the formula-type adsorbent recycling technology, belongs to the field of industrial gas purification. Background technique [0002] When coal is burned, a large amount of SO is produced 2 , NO x and Hg 0 pollutants, causing serious pollution to the environment. Therefore, the control SO 2 , NO x , Hg 0 It is an important way to control environmental pollution. Existing pollutant removal devices control flue gas pollutants in coal-fired power plants mainly in the following three aspects: use electrostatic precipitator (ESP), bag filter (FF) and other technologies to control dust; use wet desulfurization device (FGD), dry, semi-dry limestone injection and other desulfurization technologies on SO 2 Removal; using selective catalytic reduction technology (SCR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28B01J23/89B01D53/86B01D46/02B01D53/60B01D53/64B01J20/34
CPCB01D46/023B01D53/8637B01D53/8665B01D53/869B01D2253/102B01D2253/108B01D2253/1122B01D2253/1124B01D2255/20707B01D2255/20723B01D2255/20776B01D2259/40088B01J20/02B01J20/06B01J20/18B01J20/20B01J20/28009B01J20/3483B01J23/8993Y02A50/20
Inventor 刁永发周发山刘鑫杨茹
Owner DONGHUA UNIV
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