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A kind of method of ruthenium complexing agent wet flue gas denitrification

A complexing agent and flue gas technology, which is applied in the field of ruthenium complexing agent wet flue gas denitrification, can solve the problems of large material consumption, lower utilization rate of complexing agent, deactivation of complexing agent, etc., and achieve obvious denitrification effect, Excellent denitrification performance, fast combination effect

Inactive Publication Date: 2020-12-08
WUHAN UNIV OF TECH
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Problems solved by technology

[0004] The wet complexation denitrification technology is most studied mainly Fe(Ⅱ)EDTA method and Co(NH 3 ) 6 2— However, the main problem of this technology is that the complexing center ion is easily oxidized by the oxygen in the tail gas, thus deactivating the complexing agent and greatly reducing the utilization rate of the complexing agent
Although many researchers try to slow down the oxidation by adding reducing agents, most of these reducing agents have low reduction efficiency, large material consumption, high cost, and will introduce new substances into the solution, making the solution composition more complicated. These factors also Limit the application of related technologies
Chinese patent document 200510062296.0 discloses a wet complexation denitration process using vitamin C compounds to enhance Fe(II)EDTA. Although the addition of vitamins can slow down the oxidation of Fe(II)EDTA to a certain extent, the consumption of vitamin C Large, high cost, unable to realize engineering application

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  • A kind of method of ruthenium complexing agent wet flue gas denitrification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of ruthenium complexing agent:

[0027] In the round-bottomed flask reactor, potassium pentachlororuthenate hydrate was used as the ruthenium source, heated in a water bath at 60°C under the action of magnetic stirring, and condensed and refluxed to react with EDTA-2Na, EDTA-2Na and hydrated pentachloro The molar ratio of potassium ruthenate is 1, and the reaction time is 1h. Precipitate with cold ethanol aqueous solution (the volume ratio of water and ethanol is 1:9), obtain the precipitate by filtration, and then vacuum-dry the product in a drying oven at a temperature of 60°C. 12h processing, and finally get Ru Ⅲ (edta) complexing agent.

[0028] (2) Wet complexation denitrification:

[0029] The absorption device is a packed absorption tower, and its parameters are: the diameter is 40mm, the height is 800mm, the glass spring is used as the filler, and the filler height is 600mm. Ru Ⅲ The (edta) solution is used as an absorbing liquid to absorb NO...

Embodiment 2

[0031] (1) Preparation of ruthenium complexing agent: In a round-bottomed flask reactor, potassium pentachlororuthenate hydrate is used as a ruthenium source, heated in a 70°C water bath under the action of magnetic stirring, and condensed and refluxed, and EDTA-2Na Carry out the reaction, the mol ratio of EDTA-2Na and potassium pentachlororuthenate hydrate is 1.1, and the reaction time is 1.5h, precipitates with cold ethanol aqueous solution (water and ethanol volume ratio is 1:9), obtains precipitation through filtration, then product is in Vacuum drying was carried out in a drying oven at 70°C for 18 hours to obtain Ru Ⅲ (edta) complexing agent.

[0032] (2) Wet complexation denitrification: the absorption device is a packed absorption tower, and its parameters are: the diameter is 40mm, the height is 800mm, and the glass spring is used as the filler, and the filler height is 600mm. Ru Ⅲ The (edta) solution is used as an absorbing liquid to absorb NO in the flue gas by me...

Embodiment 3

[0034] (1) Preparation of ruthenium complexing agent: In a round-bottomed flask reactor, potassium pentachlororuthenate hydrate is used as a ruthenium source, heated in a water bath at 80°C under the action of magnetic stirring, and condensed and refluxed, and EDTA-2Na Carry out the reaction, the mol ratio of EDTA-2Na and potassium pentachlororuthenate hydrate is 1.2, and the reaction time is 2h, precipitates with cold ethanol aqueous solution (water and ethanol volume ratio is 1:9), obtains precipitation through filtration, then product is in temperature Vacuum drying in a drying oven at 80°C for 12 hours to obtain Ru Ⅲ (edta) complexing agent.

[0035] (2) Wet complexation denitrification: the absorption device is a packed absorption tower, and its parameters are: the diameter is 40mm, the height is 800mm, and the glass spring is used as the filler, and the filler height is 600mm. Ru Ⅲ The (edta) solution is used as an absorbing liquid to absorb NO in the flue gas by means...

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Abstract

The invention discloses a method for wet flue gas denitrification by a ruthenium complexing agent. The method includes RuIII(edta) complexing agent preparation and complexing denitrification process.Potassium ruthenium pentachloride hydrate serves as a ruthenium source to prepare a RuIII(edta) complexing agent, and flue gas enters an absorption device from the bottom to realize counter-current contact with circulating absorption low-concentration RuIII(edta) complexing liquid; in a flue gas oxygen content range of 3%-10%, oxygen content has low influences on complexing denitrification, and the complexing agent shows great denitrification performances. The complexing agent is high in denitrification efficiency and great in anti-oxidation performance, extra adding of antioxidants is avoided, and process simplicity is realized.

Description

technical field [0001] The invention relates to the field of tail gas treatment, in particular to a method for wet flue gas denitrification with a ruthenium complexing agent. Background technique [0002] With the rapid development of the global economy, people's demand for fossil energy such as coal, oil, and natural gas is also increasing, and the combustion of these fossil energy will produce nitrogen oxides (NO x ) and other harmful gases, their emissions directly lead to serious atmospheric problems such as photochemical smog, acid rain, and ozone layer depletion, causing major harm to the natural environment and human health. Therefore carry out NO x and other harmful gas emissions and control technology research is imminent. [0003] NO x It mainly exists in the form of NO, so the key is to carry out research on NO treatment. Flue gas denitrification technology can be divided into dry method and wet method according to its operating characteristics. Dry methods ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1456B01D53/1493B01D2252/20B01D2257/40B01D2258/0283
Inventor 张光旭许文晋许超
Owner WUHAN UNIV OF TECH
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