Mercury removal adsorbent suitable for coal-fired flue gas and preparation method thereof

A technology of coal-fired flue gas and adsorbent, which is applied in the field of mercury removal adsorbent and its preparation, can solve the problems of unstable performance of mercury removal adsorbent, difficult application in production process, cumbersome preparation process, etc. The effect of stable adsorption product and high adsorption performance

Active Publication Date: 2018-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing activated carbon mercury removal methods still have the following problems: (1) The preparation process is cumbersome, time-consuming, and economical; (2) The performance of the mercury removal adsorbent is unstable, and other polluting wastes are generated during the preparation process. Problem; (3) Mercury removal adsorbent cannot have the characteristics of high adsorption efficiency, stable performance and energy saving at the same time, and the production process is difficult to apply in actual engineering

Method used

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  • Mercury removal adsorbent suitable for coal-fired flue gas and preparation method thereof
  • Mercury removal adsorbent suitable for coal-fired flue gas and preparation method thereof

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preparation example Construction

[0029] The preparation method mainly comprises the following steps:

[0030]Step 1, providing a modification mechanism, which includes a first plasma reactor 1 and a second plasma reactor 2 connected in series. The second plasma reactor 2 is connected to a spray gun 3 . The spray gun 3 communicates with the coal-fired flue gas pipeline 4 , and the coal-fired flue gas pipeline 4 is connected to the bag filter 5 . In this embodiment, the injection gun 3 is made of a stainless steel round tube, which is used to inject the mercury-removing adsorbent from the second plasma reactor 2 into the coal-burning pipeline 4 . The bag filter 5 is used to collect the mercury-removing adsorbent after absorbing mercury. The first plasma reactor 1 and the second plasma reactor 2 are connected by stainless steel pipes, and the second plasma reactor 2 and the spray gun 3 are connected by hoses.

[0031] The structure of the first plasma reactor 1 is the same as that of the second plasma reactor...

Embodiment 1

[0044] Adjust the flow rate and flow rate of the carrier gas, the residence time of the activated carbon powder in the first plasma reactor 1 and the second plasma reactor 2 is 0.1 second, and the first plasma reactor 1 and the output voltage of the second plasma reactor 2 is set to 35kV.

[0045] Wherein, the purified SO is introduced into the first plasma reactor 1 2 Exhaust gas, because the carrier gas is compressed air, has a high oxygen concentration. In the first plasma reactor 1, the reaction 2SO 2 +O 2 →2SO 3 , 2SO 3 +2AC→2AC-S+2O 3 ; Pass into pure Cl in the second plasma reactor 2 2 , use the bag filter 5 to collect the modified activated carbon powder at the outlet of the second plasma reactor 2.

[0046] In order to verify the mercury removal performance of the activated carbon powder, a mercury adsorption test was carried out on the obtained activated carbon powder on a fixed bed, the process of adsorbing mercury is:

[0047] Hg+AC-Cl→AC-Hg-Cl;

[0048] 2...

Embodiment 2

[0051] Regulate the flow rate and the flow rate of carrying gas, the residence time of activated carbon powder in the first plasma reactor 1 and the second plasma reactor 2 is 0.1 second, and the first plasma reactor 1 and the second plasma reactor 2 The output voltage of the second plasma reactor 2 is set to 35kV.

[0052] Wherein, pure H is introduced into the first plasma reactor 1 2 S gas, Cl is introduced into the second plasma reactor 2 2 , use the bag filter 5 to collect the modified activated carbon powder at the outlet of the second plasma reactor 2. In addition, in order to verify the mercury removal performance of the activated carbon powder, a mercury adsorption test was carried out on the obtained activated carbon powder on a fixed bed. The test results showed that the adsorption efficiency continued at 96% in the first 60 minutes of the adsorption test. The adsorption efficiency gradually decreased to 92% between the 60th minute and the 120th minute.

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Abstract

The invention belongs to the technical field related to mercury emission control of coal-fired flue gas, and discloses a mercury removal adsorbent suitable for coal-fired flue gas and a preparation method thereof, the method comprises the following steps: (1) a modification mechanism is provided, and the modification mechanism includes a first plasma reactor and a second plasma reactor connected in series; (2) a carrier gas and a first reactive gas are introduced into the first plasma reactor, the carrier gas carries activated carbon to enter the first plasma reactor, the first plasma reactorperforms plasma treatment on the activated carbon, and after C-S bonds generate on the surface of the activated carbon, the activated carbon enters the second plasma reactor; and (3) a second active gas is introduced into the second plasma reactor, and the second plasma reactor performs plasma treatment on the activated carbon to form C-Cl bonds on the surface of the activated carbon to complete the preparation of the mercury removal adsorbent. The preparation method has lower energy consumption, shorter cycle and higher flexibility.

Description

technical field [0001] The invention belongs to the related technical field of mercury emission control of coal-fired flue gas, and more specifically relates to a mercury-removing adsorbent suitable for coal-fired flue gas and a preparation method thereof. Background technique [0002] Mercury in the atmosphere enters water and soil through sedimentation, and under the action of bacteria, mercury is converted into methylmercury, which is harmful to the environment. Methylmercury is a neurotoxic substance with strong bioaccumulation and a great threat to human health. Among the emission sources of atmospheric mercury, anthropogenic mercury emission is the main source of mercury emission. Among them, mercury emissions from coal-fired power plants are considered to be the largest single source of anthropogenic mercury pollution. [0003] my country is a country rich in coal, low in gas and poor in oil. This energy structure determines that coal will continue to be the primary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01D2258/0283B01J20/20
Inventor 罗光前朱海露邹仁杰史梦婷许洋胡靖远李显姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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