Method for removing mercury and mercury-containing compounds from oxygen-enriched combustion flue gas, and adsorbent and preparation method thereof

A technology of combustion flue gas and oxygen-enriched combustion, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high production cost and transportation cost of active gas, achieve low N content, simple process, and low energy consumption Effect

Inactive Publication Date: 2018-11-13
GUANGZHOU CR THERMOELECTRICITY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This method can greatly improve the mercury adsorption capacity and mercury removal efficiency of activated carbon, but compared with the utility model patent CN 206215035 U, the production cost and transportation cost of the active gas required by this method are higher

Method used

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  • Method for removing mercury and mercury-containing compounds from oxygen-enriched combustion flue gas, and adsorbent and preparation method thereof
  • Method for removing mercury and mercury-containing compounds from oxygen-enriched combustion flue gas, and adsorbent and preparation method thereof
  • Method for removing mercury and mercury-containing compounds from oxygen-enriched combustion flue gas, and adsorbent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Example 1: Prepare simulated flue gas according to the main flue gas components of oxy-fuel combustion cycle flue gas, the specific flue gas composition is 95% CO 2 , 3%H 2 O, 0.15% SO 2 , 0.002% HCl, the rest is O 2 , the flue gas temperature is 200°C. Adjust the flow rate of the carrier gas, and the time for the activated carbon powder to pass through the plasma reactor is 0.1 second. The plasma generator output voltage was set to 40kV. The mercury adsorption test was carried out on a fixed bed, and the effect of the adsorbent obtained by the above method was tested. The test results show that in the first 30 minutes of the adsorption test, the adsorption efficiency continued at 93%, and after 30 minutes of the adsorption test, the adsorption efficiency dropped sharply, and the adsorption efficiency dropped to 50% at the 60th minute.

Embodiment 2

[0045] Example 2: Prepare simulated flue gas according to the main flue gas components of oxygen-enriched combustion cycle flue gas, the specific flue gas composition is 95% CO 2 , 3%H 2 O, 0.15% SO 2 , 0.002% HCl, the rest is O 2 , the flue gas temperature is 200°C. Adjust the flow rate of the carrier gas, and the time for the activated carbon powder to pass through the plasma reactor is 0.1 second. The plasma generator output voltage was set to 35kV. The modified activated carbon powder was collected at the outlet of the plasma reactor with a bag filter. The mercury adsorption test was carried out on a fixed bed, and the effect of the adsorbent obtained by the above method was tested. The test results showed that the adsorption efficiency continued at 95% in the first 30 minutes of the adsorption test, and slowly decreased to 90% between the 30th and 60th minutes of the adsorption test.

Embodiment 3

[0046] Example 3: Prepare simulated flue gas according to the main flue gas components of oxy-fuel combustion cycle flue gas, the specific flue gas composition is 95% CO 2 , 3%H 2 O, 0.15% SO 2 , 0.002% HCl, the rest is O 2 , the flue gas temperature is 200°C. Adjust the flow rate of the carrier gas, and the time for the activated carbon powder to pass through the plasma reactor is 0.1 second. The plasma generator output voltage was set to 30kV. The modified activated carbon powder was collected at the outlet of the plasma reactor with a bag filter. The mercury adsorption test was carried out on a fixed bed, and the effect of the adsorbent obtained by the above method was tested. The test results showed that the adsorption efficiency continued at 96% in the first 60 minutes of the adsorption test, and gradually decreased to 92% between the 60th minute and the 120th minute of the adsorption test.

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Abstract

The invention discloses a method for removing mercury and mercury-containing compounds from oxygen-enriched combustion flue gas. The method comprises the following steps: S01, acquiring combustion flue gas containing main components of CO2, H2O and O2, wherein the smoke contains 73%-97% of CO2, 1%-26% of H2O, 1%-5% of O2, and 0.02%-0.05 % of HCl in volume ratio; S02, transporting the recycled fluegas carrying activated carbon powder in the step S01 to a plasma reactor, and carrying out low temperature plasma treatment, so as to make the combustion flue gas components in a highly active atom or ionic state through plasma and form active functional groups on activated carbon to achieve adsorption and removal of mercury in the combustion flue gas; S03, delivering a mercury removal adsorbentto the mercury-containing combustion flue gas and attaching to a combustion flue gas filtering device, so as to form a fluidized bed for collecting and removing mercury and mercury compounds from thecombustion flue gas; and S04, updating the adsorbent on the fluidized bed, namely updating the mercury removal adsorbent on the filtering device every 120 minutes. The modified activated carbon is used for removing mercury and compounds from flue gas, and the mercury removal efficiency is high.

Description

technical field [0001] This patent relates to the field of mercury control in oxygen-enriched combustion flue gas, in particular to a method for removing mercury and mercury-containing compounds in oxygen-enriched combustion flue gas, and to a method for removing mercury and mercury-containing compounds in combustion flue gas Sorbent preparation method. Background technique [0002] Coal-fired power plants are the largest anthropogenic CO 2 one of the emission sources. Oxygen-rich combustion (O 2 / CO 2 Combustion) technology is suitable for the transformation of new or existing air-fired boilers due to its technical compatibility with traditional air-fired boilers, and is considered to have the greatest potential to realize large-scale CO2 combustion. 2 One of the captured techniques. Due to flue gas recirculation, the mercury content in oxyfuel flue gas is usually much higher than in conventional air combustion flue gas. Because mercury in oxyfuel combustion flue gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32B01D53/12B01D53/50B01D53/62B01D53/64B01J20/20B01J20/30
CPCB01D53/12B01D53/323B01D53/50B01D53/62B01D53/64B01D2257/504B01D2257/602B01D2258/0283B01D2259/818B01J20/20B01J20/3085Y02C20/40
Inventor 韦丹杨新生韩军余方斌秦林波
Owner GUANGZHOU CR THERMOELECTRICITY CO LTD
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