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Use of ferrous sulfide suspensions for mercury removal from flue gases

A ferrous sulfide and suspension technology, which is applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve the complicated problems of mercury removal and achieve the effect of reducing mercury emissions

Active Publication Date: 2018-03-27
REDOX TECH GRP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Mercury removal from flue gas streams is complex due to the dynamic environment in wet scrubber systems

Method used

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  • Use of ferrous sulfide suspensions for mercury removal from flue gases
  • Use of ferrous sulfide suspensions for mercury removal from flue gases
  • Use of ferrous sulfide suspensions for mercury removal from flue gases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] In this example, a ferrous sulfide suspension was tested in a plant with a 250 MW pulverized coal boiler firing bituminous coal. The boiler uses SCR to control NO x , use a baghouse to remove particulates, and use a wet flue gas desulfurization (FGD) unit to control SO 2 emission. The test setup is shown in image 3 . Each scrubber has a working volume of approximately 30,000 gallons.

[0090] At the beginning of the example, 60 gallons of ferrous sulfide suspension were pumped into the discharge of each pump. The pumps fed the ferrous sulfide suspension to each scrubber system at a rate of 6 gpm, so it took approximately 10 minutes to send the 60 gallons into each scrubber system at each side outlet of the circulation pump.

[0091]The total Hg tended to decrease significantly from the Hg CEMS within 5 minutes after the ferrous sulfide suspension was introduced into the scrubber. After the initial charge of 60 gallons of ferrous sulfide suspension was pumped into ...

Embodiment 2

[0099] In this example, different amounts of ferrous sulfide suspension were injected into the same 250 MW bituminous coal fired pulverized coal boiler used in Example 1.

[0100] The initial baseline mercury test is as follows:

[0101] On July 11, 2013, the total Hg removal efficiency was 76.5%. Although the original Hg oxidation at the FGD inlet was 88.7%, experimental results indicated that a substantial increase (56%) in Hg0 throughout the wet FGD was due to mercury re-emission.

[0102] On July 25, 2013, the total Hg removal efficiency was 75.0% and the original Hg oxidation at the wet FGD inlet was 98.3%. The test results again showed a substantial increase (1,200%) in mercury re-emissions across the wet FGD.

[0103] Finally, on November 11, 2013, the total Hg removal efficiency was 87.8%, and the natural Hg oxidation at the wet FGD inlet was 97.0%. Hg0 increased by 239%.

[0104] Hg due to mercury re-emission throughout wet FGD 0 Significant increases in , preven...

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Abstract

A ferrous sulfide suspension that includes at least FeSm and Al(OH)3 and which can be used to reduce mercury emissions in flue gases. Through a combination of complex chemical reactions, precipitation, co-precipitation, and surface adsorption the ferrous sulfide suspension of the present invention effectively removes mercury from gaseous streams while concurrently preventing mercury re-emission.

Description

technical field [0001] The present invention generally relates to the remediation of pollutants in flue gas. A more specific embodiment of the present invention relates to a wet gas scrubbing liquid comprising a basic ferrous sulfide suspension for the treatment and removal of mercury from flue gas, and a method for using the wet gas scrubbing liquid to remove mercury from flue gas method. The invention further relates to a process for producing the ferrous sulfide suspension. Background technique [0002] Pollutants emitted from coal-fired boilers are an important environmental issue. In particular, atmospheric emissions of mercury from these sources are of increasing concern as a threat to human health and the environment because mercury is a neurotoxin even at low concentrations. Different coal sources contain different concentrations of mercury, so the total amount of mercury emitted to the atmosphere from the combustion of coal varies significantly from facility to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/64B01D53/83B01D53/02
CPCB01D53/64B01D53/78B01D2251/20B01D2257/602B01D2258/0283B01D53/02
Inventor T·P·麦卡洛G·J·迈尔R·E·罗珀A·J·克里基
Owner REDOX TECH GRP LLC