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CLP process based method for removing and recycling mercury and regenerating adsorbent in coal-fired flue gas

A technology of adsorbent regeneration and coal-fired flue gas, which is applied in the field of flue gas purification, can solve the problems of resources not being recycled, and achieve the effects of reducing mercury removal costs, long use time, and low energy and loss

Inactive Publication Date: 2018-09-07
YANCHENG DONGBO ENVIRONMENT PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcoming that resources cannot be recycled in the prior art, and propose a method based on CLP process for mercury removal and recovery in coal-fired flue gas and sorbent regeneration method

Method used

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  • CLP process based method for removing and recycling mercury and regenerating adsorbent in coal-fired flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] refer to figure 1 , a method for mercury removal and recovery and adsorbent regeneration in coal-fired flue gas based on CLP process, comprising the following steps:

[0027] S1. Mercury oxidation adsorption removal process: Mercury-containing flue gas enters the mercury oxidation adsorption removal reactor 3 from the first air inlet 1 at a speed of 5m / s, contacts and reacts with the metal compound carrier adsorbent, and mercury oxidation adsorption removal The internal temperature of the reactor 3 is 80°C, and the clean flue gas after mercury removal is discharged from the gas outlet 14;

[0028] The elemental mercury in the flue gas is oxidized to divalent mercury, which stays on the surface of the carrier adsorbent to form a mercury-rich adsorbent. The volume ratio of the metal compound carrier adsorbent to the mercury-containing flue gas is 100mg / m 3 ; The metal compound carrier adsorbent used in S1 is metal oxide MnO X ;

[0029] S2. Mercury desorption recovery ...

Embodiment 2

[0033] refer to figure 1 , a method for mercury removal and recovery and adsorbent regeneration in coal-fired flue gas based on CLP process, comprising the following steps:

[0034] S1. Mercury oxidation adsorption removal process: Mercury-containing flue gas enters the mercury oxidation adsorption removal reactor 3 from the first air inlet 1 at a speed of 5m / s, contacts and reacts with the metal compound carrier adsorbent, and mercury oxidation adsorption removal The internal temperature of the reactor 3 is 90°C, and the clean flue gas after mercury removal is discharged from the gas outlet 14;

[0035] The elemental mercury in the flue gas is oxidized to divalent mercury, which stays on the surface of the carrier adsorbent to form a mercury-rich adsorbent. The volume ratio of the metal compound carrier adsorbent to the mercury-containing flue gas is 200mg / m3; the metal compound used in S1 The carrier adsorbent is metal oxide CoO X ;

[0036] S2. Mercury desorption recover...

Embodiment 3

[0040] refer to figure 1 , a method for removing and recovering mercury from coal-fired flue gas and regenerating an adsorbent based on a CLP process, comprising the following steps:

[0041] S1. Mercury oxidative adsorption and removal process: The mercury-containing flue gas enters the mercury oxidative adsorption and removal reactor 3 from the first air inlet 1 at a speed of 5 m / s and contacts and reacts with the metal compound carrier adsorbent, and the mercury oxidative adsorption and removal The internal temperature of the reactor 3 is 120°C, and the clean flue gas after mercury removal is discharged from the gas outlet 14;

[0042] The elemental mercury in the flue gas is oxidized to divalent mercury, which stays on the surface of the carrier adsorbent to form a mercury-rich adsorbent. The ratio of the metal compound carrier adsorbent to the volume of mercury-containing flue gas is 1000 mg / m 3 ; The metal compound carrier adsorbent used in S1 is metal sulfide FeS X ; ...

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Abstract

The invention relates to the technical field of purification of flue gas, in particular to a CLP process based method for removing and recycling mercury and regenerating adsorbent in coal-fired flue gas. The method comprises the following steps: S1, the process of oxidizing, adsorbing and removing mercury: oxidizing the element mercury in the flue gas to bivalent mercury, stopping on the surface of a carrier adsorbent, and forming the high-mercury adsorbent; S2, the process of desorbing and recycling mercury: heating and desorbing the high-mercury adsorbent, completely releasing the bivalent mercury stopping on the surface of the adsorbent again in the form of elementary gas mercury, recycling the mercury, and obtaining the desorbed carrier adsorbent; S3, the process of activating and regenerating the adsorbent: introducing the activated gas, heating the absorbent to activate and regenerate, and enabling the activated regenerated carrier adsorbent to return to a mercury oxidizing adsorbing removal reactor through a first pipeline to recycle. The recovery rate of the carrier adsorbent and the recovery rate of mercury are increased.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method for removing mercury in coal-burning flue gas and regenerating an adsorbent based on a CLP process. Background technique [0002] my country is the largest coal producer and consumer in the world. Environmental pollutants brought by coal combustion remain high, among which mercury and its compounds have become relay dust in coal combustion flue gas, SO X , NO X The fourth largest pollutant after that. Mercury is a toxic heavy metal element, which poses a serious threat to human health and the natural environment due to its strong volatility, migration, and accumulation. my country promulgated the "Emission Standards of Air Pollutants for Thermal Power Plants" in 2011, stipulating that the emission standard for mercury and its compounds in coal-fired power plants is 30 μg / Nm 3 , the Special Policy Research Group (SPS Team) of the my country Council for I...

Claims

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Application Information

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IPC IPC(8): B01D53/64B01D53/81B01D53/96
CPCB01D53/346B01D53/64B01D53/81B01D53/96B01D2251/10B01D2251/60B01D2251/602B01D2257/602B01D2258/0283
Inventor 刘猛王海军
Owner YANCHENG DONGBO ENVIRONMENT PROTECTION TECH CO LTD
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