CN105126604A - Method for oxidizing elemental mercury of coal-fired flue gas - Google Patents
Method for oxidizing elemental mercury of coal-fired flue gas Download PDFInfo
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- CN105126604A CN105126604A CN201510391919.2A CN201510391919A CN105126604A CN 105126604 A CN105126604 A CN 105126604A CN 201510391919 A CN201510391919 A CN 201510391919A CN 105126604 A CN105126604 A CN 105126604A
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- reactor
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- gas
- fired flue
- catalyst
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Abstract
The invention discloses a method for oxidizing elemental mercury of coal-fired flue gas, and the method comprises the following steps: 1) a certain amount of CuCl<2>, KCl and MgCl<2> are weighed, then dissolved in deionized water to form a solution A, gamma-Al<2>O<3> is added in the solution A, and impregnated; the impregnated products are dried in a drying oven to obtain oxychlorinated catalysts, wherein element Cu, K, Mg in the oxychlorinated catalysts account for 5-7%, 0.5-1.5%, 1.5-2% by weight respectively; 2) the oxychlorinated catalysts obtained in step 1) and SCR catalysts, with mass ratio of 0.5-1: 1, are respectively placed in a first reactor and a second reactor, then the two reactors are connected; and 3) flue gas to be processed is enabled to orderly pass the first reactor and the second reactor; oxidation of elemental mercury in the flue gas is accomplished. The oxidation of the elemental mercury in the flue gas in the invention can be implemented based on the SCR catalysts.
Description
Technical field
The invention belongs to power environment protection field, relate to the method for oxidation of nonvalent mercury in a kind of flue gas, be specifically related to a kind of method being oxidized nonvalent mercury in coal-fired flue-gas.
Background technology
Flue gas demercuration is the focus of power environment protection area research in recent years, and in flue gas, nonvalent mercury removes because of the high and difficulty of its content, becomes the important and difficult issues of flue gas demercuration technical research.Common thinking first nonvalent mercury is oxidized to divalent ion mercury, then removed by divalent ion mercury in wet desulphurization, thus realize removing of nonvalent mercury.
Document Investigation finds, the method of current oxidizing zero-valence mercury mainly contains: oxidant additive process (YanCao.Energy & Fuels, 2007,21:2719-2730.ZanQu.EnvironmentalScience & Technology, 2009,43:8610-8615.Andrej
fuel, 2010,89:3167-3177.), photocatalytic oxidation (Hsing-ChengHis.Chemicalengineeringjournal, 2012,191:378-385.; JaeHanCho.JournalofIndustrialandEngineeringChemistry, 2013,19:144 ~ 149.), metal (or metal oxide) oxidizing process (JuanHe.ThejournalofphysicalchemistryC, 2011,115,24300-24309; JuanHe.Energy & Fuels2013,27:4832-4839; ShijianYang.Environmentalscience & technology, 2011,45:1540-1546.) and SCR catalytic oxidation (RaikStolle, HeinzKoeser.AppliedcatalysisB:Environmental, 2014,144:486-497; WeiGao.Chemicalengineeringjournal, 2013,220:53-60; ManuelaRallo.Chemicalengineeringjournal, 2012, (198-199): 87-94; DeepakPudasainee.Fuel, 2010,89:804-809.).Wherein, SCR catalytic oxidation can utilize the existing denitrification apparatus of power plant to carry out collaborative demercuration, and its cost is low, is convenient to implement, and has wide through engineering approaches application prospect, receives much concern.But research finds: commercial SCR catalyst on the oxidation efficiency of nonvalent mercury by chlorine content in coal (or in flue gas HCl content) impact significantly; In the coal smoke that chlorinity is low, its nonvalent mercury oxidation efficiency usually below 10%, and will obtain high mercury oxidation rate, and in flue gas, HCl concentration must up to hundreds of ppm.Because China's coal is mostly low chlorine coal, HCl content lower (30 ~ 50ppm) in flue gas, should not use SCR catalytic oxidation demercuration.Therefore, develop a kind of novel nonvalent mercury oxidation technology based on SCR catalyst and seem particularly necessary and important.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of method being oxidized nonvalent mercury in coal-fired flue-gas, the method can complete the oxidation of nonvalent mercury in coal-fired flue-gas based on SCR catalyst.
For achieving the above object, in oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 5 ~ 7%, 0.5 ~ 1.5% and 1.5 ~ 2%;
2) by step 1) oxychlorination catalyst that obtains and SCR catalyst be placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor are communicated with, wherein, the mass ratio of oxychlorination catalyst and SCR catalyst is 0.5-1:1;
3) allow and need pass into the first reactor and the second reactor successively by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 1-2h.
Step 1) in be placed in the dry 24-48h of baking oven by flooding the product that obtains, baking temperature is 110-120 DEG C.
Described SCR catalyst is cellular V
2o
5-WO
3/ TiO
2type catalyst.
The present invention has following beneficial effect:
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury can be oxidized nonvalent mercury in low chlorine coal-fired flue-gas.The method first prepares oxychlorination catalyst, in the process of process coal-fired flue-gas, HCl and O in flue gas
2cl is generated under oxychlorination catalyst effect
2, Cl
2react under SCR catalyst effect with the nonvalent mercury in flue gas and generate HgCl
2, thus realize the oxidation of nonvalent mercury in coal-fired flue-gas, due to Cl
2generated by oxi-chlorination by oxychlorination catalyst, but not HCl and SCR catalyst effect generate, the existence of SCR catalyst simultaneously effectively can reduce Cl
2with Hg
0the activation energy of homogeneous reaction, drastically increases the oxidation efficiency of nonvalent mercury, efficiently solves the problem that traditional SCR catalytic oxidation is not suitable for low chlorine flue-gas demercuration.In addition, oxychlorination catalyst preparation is simple, and raw material sources are wide, cheap.
Detailed description of the invention
Being described in further detail the present invention below in conjunction with specific embodiment, is below explanation of the invention instead of restriction.
Embodiment one
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 5%, 0.5% and 1.5%;
2) by step 1) oxychlorination catalyst that obtains and cellular V
2o
5-WO
3/ TiO
2type catalyst is placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor is communicated with, wherein, and oxychlorination catalyst and cellular V
2o
5-WO
3/ TiO
2the mass ratio of type catalyst is 0.5:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 1h.
Step 1) in be placed in the dry 48h of baking oven by flooding the product that obtains, baking temperature is 120 DEG C.
Simulated flue gas is utilized to evaluate the mercury oxidation performance of catalyst system and catalyzing: experiment condition is: HCl:30ppm, NO:350ppm, NH
3: 350ppm, O
2: 3%, SO
2: 500ppm, N
2for balanced gas, total gas flow rate 10000ml/min, range of reaction temperature 300 ~ 400 DEG C, with the oxidation efficiency of Ontario method test nonvalent mercury.Result shows: within the scope of 300 ~ 400 DEG C, and in flue gas, the oxidation efficiency of nonvalent mercury can up to 87%.
Embodiment two
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 6%, 1% and 1.7%;
2) by step 1) oxychlorination catalyst that obtains and cellular V
2o
5-WO
3/ TiO
2type catalyst is placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor is communicated with, wherein, and oxychlorination catalyst and cellular V
2o
5-WO
3/ TiO
2the mass ratio of type catalyst is 0.5:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 2h.
Step 1) in be placed in the dry 24h of baking oven by flooding the product that obtains, baking temperature is 110 DEG C.
Simulated flue gas is utilized to evaluate the mercury oxidation performance of catalyst system and catalyzing: experiment condition is: HCl:30ppm, NO:350ppm, NH
3: 350ppm, O
2: 3%, SO
2: 500ppm, N
2for balanced gas, total gas flow rate 10000ml/min, range of reaction temperature 300 ~ 400 DEG C, with the oxidation efficiency of Ontario method test nonvalent mercury.Result shows: within the scope of 300 ~ 400 DEG C, and in flue gas, the oxidation efficiency of nonvalent mercury can up to 88.5%.
Embodiment three
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, being finally placed in baking oven drying by flooding the product obtained, obtaining oxychlorination catalyst, wherein, CuCl in oxychlorination catalyst
2, KCl and MgCl
2mass fraction be respectively 7%, 1.5% and 2%;
2) by step 1) oxychlorination catalyst that obtains and cellular V
2o
5-WO
3/ TiO
2type catalyst is placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor is communicated with, wherein, and oxychlorination catalyst and cellular V
2o
5-WO
3/ TiO
2the mass ratio of type catalyst is 0.5:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 1.2h.
Step 1) in be placed in the dry 30h of baking oven by flooding the product that obtains, baking temperature is 115 DEG C.
Simulated flue gas is utilized to evaluate the mercury oxidation performance of catalyst system and catalyzing: experiment condition is: HCl:30ppm, NO:350ppm, NH
3: 350ppm, O
2: 3%, SO
2: 500ppm, N
2for balanced gas, total gas flow rate 10000ml/min, range of reaction temperature 300 ~ 400 DEG C, with the oxidation efficiency of Ontario method test nonvalent mercury.Result shows: within the scope of 300 ~ 400 DEG C, and in flue gas, the oxidation efficiency of nonvalent mercury can up to 91.5%.
Embodiment four
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 5%, 0.5% and 1.5%;
2) by step 1) oxychlorination catalyst that obtains and cellular V
2o
5-WO
3/ TiO
2type catalyst is placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor is communicated with, wherein, and oxychlorination catalyst and cellular V
2o
5-WO
3/ TiO
2the mass ratio of type catalyst is 0.7:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 2h.
Step 1) in be placed in the dry 40h of baking oven by flooding the product that obtains, baking temperature is 118 DEG C.
Simulated flue gas is utilized to evaluate the mercury oxidation performance of catalyst system and catalyzing.Experiment condition is: HCl:30ppm, NO:350ppm, NH
3: 350ppm, O
2: 3%, SO
2: 500ppm, N
2for balanced gas, total gas flow rate 10000ml/min, range of reaction temperature 300 ~ 400 DEG C, with the oxidation efficiency of Ontario method test nonvalent mercury.Result shows: within the scope of 300 ~ 400 DEG C, and in flue gas, the oxidation efficiency of nonvalent mercury can up to 92%.
Embodiment five
In oxidation coal-fired flue-gas of the present invention, the method for nonvalent mercury comprises the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, and then add γ-Al in solution A
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 5%, 0.5% and 1.5%;
2) by step 1) oxychlorination catalyst that obtains and cellular V
2o
5-WO
3/ TiO
2type catalyst is placed in the first reactor and the second reactor respectively, then the first reactor and the second reactor is communicated with, wherein, and oxychlorination catalyst and cellular V
2o
5-WO
3/ TiO
2the mass ratio of type catalyst is 1:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
Described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
Step 1) in dipping time be 1.7h.
Step 1) in be placed in the dry 45h of baking oven by flooding the product that obtains, baking temperature is 112 DEG C.
Simulated flue gas is utilized to evaluate the mercury oxidation performance of catalyst system and catalyzing: experiment condition is: HCl:30ppm, NO:350ppm, NH
3: 350ppm, O
2: 3%, SO
2: 500ppm, N
2for balanced gas, total gas flow rate 10000ml/min, range of reaction temperature 300 ~ 400 DEG C.With the oxidation efficiency of Ontario method test nonvalent mercury.Result shows: within the scope of 300 ~ 400 DEG C, and in flue gas, the oxidation efficiency of nonvalent mercury can up to 96%.
Claims (5)
1. be oxidized a method for nonvalent mercury in coal-fired flue-gas, it is characterized in that, comprise the following steps:
1) a certain amount of CuCl is taken
2, KCl and MgCl
2, then by CuCl
2, KCl and MgCl
2be dissolved in deionized water, form solution A, then in solution A, add γ-Al
2o
3, and flood, be finally placed in baking oven drying by flooding the product obtained, obtain oxychlorination catalyst, wherein, in oxychlorination catalyst, the mass fraction of Cu element, K element and Mg element is respectively 5 ~ 7%, 0.5 ~ 1.5% and 1.5 ~ 2%;
2) by step 1) oxychlorination catalyst that obtains and SCR catalyst be placed in the first reactor and the second reactor respectively, and then the first reactor and the second reactor are communicated with, wherein, the mass ratio of oxychlorination catalyst and SCR catalyst is 0.5-1:1;
3) allow and need pass into successively in the first reactor and the second reactor by coal-fired flue-gas to be processed, complete the oxidation of nonvalent mercury in coal-fired flue-gas.
2. be oxidized the method for nonvalent mercury in coal-fired flue-gas according to claim 1, it is characterized in that, described γ-Al
2o
3for honeycomb support, γ-Al
2o
3specific area be 240m
2/ g.
3. be oxidized the method for nonvalent mercury in coal-fired flue-gas according to claim 1, it is characterized in that, the time of flooding in step 1) is 1-2h.
4. be oxidized the method for nonvalent mercury in coal-fired flue-gas according to claim 1, it is characterized in that, be placed in the dry 24-48h of baking oven by flooding the product obtained in step 1), baking temperature is 110-120 DEG C.
5. be oxidized the method for nonvalent mercury in coal-fired flue-gas according to claim 1, it is characterized in that, described SCR catalyst is cellular V
2o
5-WO
3/ TiO
2type catalyst.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110227560A (en) * | 2019-07-19 | 2019-09-13 | 西安热工研究院有限公司 | A kind of preparation method of honeycomb copper chloride/SCR demercuration catalyst |
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|---|---|---|---|---|
| CN101574660A (en) * | 2009-06-11 | 2009-11-11 | 上海交通大学 | Method for preparing mixed compound catalyst used for catalyzing null-valence mercury in flue-gas to be oxidized |
| CN102366722A (en) * | 2011-11-21 | 2012-03-07 | 国电科学技术研究院 | Denitrition catalyst with mercury removal effect and its preparation method |
| CN103537306A (en) * | 2013-10-16 | 2014-01-29 | 涿州西热环保催化剂有限公司 | Selective catalytic reduction (SCR) catalyst with zero-valent mercury oxidation performance and preparation method thereof |
| CN103547356A (en) * | 2011-06-30 | 2014-01-29 | 环球油品公司 | Processes and apparatuses for oxidizing elemental mercury in flue gas using oxychlorination catalysts |
-
2015
- 2015-07-06 CN CN201510391919.2A patent/CN105126604A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101574660A (en) * | 2009-06-11 | 2009-11-11 | 上海交通大学 | Method for preparing mixed compound catalyst used for catalyzing null-valence mercury in flue-gas to be oxidized |
| CN103547356A (en) * | 2011-06-30 | 2014-01-29 | 环球油品公司 | Processes and apparatuses for oxidizing elemental mercury in flue gas using oxychlorination catalysts |
| CN102366722A (en) * | 2011-11-21 | 2012-03-07 | 国电科学技术研究院 | Denitrition catalyst with mercury removal effect and its preparation method |
| CN103537306A (en) * | 2013-10-16 | 2014-01-29 | 涿州西热环保催化剂有限公司 | Selective catalytic reduction (SCR) catalyst with zero-valent mercury oxidation performance and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110227560A (en) * | 2019-07-19 | 2019-09-13 | 西安热工研究院有限公司 | A kind of preparation method of honeycomb copper chloride/SCR demercuration catalyst |
| CN110227560B (en) * | 2019-07-19 | 2021-12-28 | 西安热工研究院有限公司 | Preparation method of honeycomb-shaped copper chloride/SCR (Selective catalytic reduction) demercuration catalyst |
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Application publication date: 20151209 |
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