CN101816892A - Chemical agent capable of purifying gaseous mercury in smoke, preparation method and purifying method - Google Patents
Chemical agent capable of purifying gaseous mercury in smoke, preparation method and purifying method Download PDFInfo
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- CN101816892A CN101816892A CN 201010166723 CN201010166723A CN101816892A CN 101816892 A CN101816892 A CN 101816892A CN 201010166723 CN201010166723 CN 201010166723 CN 201010166723 A CN201010166723 A CN 201010166723A CN 101816892 A CN101816892 A CN 101816892A
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Abstract
The invention discloses a chemical agent capable of purifying gaseous mercury in smoke, a preparation method and a purifying method. The chemical agent is 2-6 sulphur atoms-containing sodium polysulfide or alkaline solution of the 2-6 sulphur atoms-containing sodium polysulfide, wherein the weight percentage of sulphur in sodium polysulfide molecule is 41-81%. The preparation method of the chemical agent comprises the following steps of: taking industrial sodium sulfide or sulphur as a raw material; leading the raw material and the alkaline medicament to have chemical reaction, wherein the reaction temperature is 50-250 DEG C, and the reaction time is 1-3h; and preparing 2-6 sulphur atoms-containing sodium polysulfide solution or powder. Or the preparation method of the chemical agent comprises the following steps of: taking the industrial sodium sulfide solution or powder as a raw material; and treating with alkaline solution to obtain the2-6 sulphur atoms-containing sodium polysulfide solution or powder. The chemical agent is sprayed into the smoke through a revolving sprayer, thereby being capable of effectively removing the gaseous mercury and achieving the aim of purifying the smoke. The invention not only can effectively purify the oxidation state mercury in the smoke, but also can effectively purify the element state mercury.
Description
Technical field
The present invention relates to a kind of chemical agent and the preparation method and purification method that can purify gaseous mercury in the flue gas.
Background technology
In the combustion process of coal, domestic waste, living beings, industrial waste and other hazardous waste, all may discharge certain density mercury.Because biological concentration and the eco-toxicity of mercury in environmental organism, the discharging of mercury has caused global extensive concern.
Domestic and international known flue gas mercury purification techniques mainly adopts wet scrubbing, the absorption of being reason, vulcanized sodium to spray and modified activated carbon modes such as (sulfur loaded elements) at present.Its pluses and minuses are as follows:
(1) wet scrubbing: the method that adopts water (solution) to spray can very be removed the oxidation state mercury in the incineration flue gas effectively, but it is general relatively poor to the removal effect of elementary gas mercury, and the wet scrubbing process produces a large amount of mercury-containing waste waters, bring bigger difficulty for follow-up sewage treatment process, secondary pollution is serious.
(2) physical absorption: adopt the method for in flue gas, spraying physisorption material or adsorption tower is installed in the cleaner back.Wherein, active carbon and molecular sieve belong to the sorbing material that is most widely used with ripe, can adsorb the oxidation state mercury in the flue gas well; But, relatively poor for the adsorption effect of elementary gas mercury.Existing documents and materials show, if be 10 μ g/m from element mercury concentration
3Flue gas in remove 90% element mercury, the amounts of activated carbon of required injection is equivalent to 3000 times～18000 times of element mercury mass concentration.Therefore, adopt its cost of method control element mercury of physical absorption very expensive.In addition, the element mercury after the charcoal absorption will reenter environment after landfill is disposed, cause secondary pollution.
(3) vulcanized sodium sprays: utilize vulcanized sodium and oxidation state mercury (being mainly mercury chloride) to have good reactivity, can effectively mercury chloride be converted into the mercury of particulate form, thereby be purified by cleaner; But this method generally is lower than 30% to the purification efficiency of element mercury.
(4) modified activated carbon (sulfur loaded element): occur utilizing the element sulphur load type active carbon to improve the experimental technique of element mercury purification efficiency in that the U.S. is up-to-date, can purify element state mercury more effectively, but undesirable for the removal effect of gaseous state mercury chloride.
And, more than these common technique only be suitable for purifying the mercury of oxidation state in the flue gas usually.
Summary of the invention
The technical issues that need to address of the present invention are with regard to being to overcome existing purification techniques and only can purifying oxidation state mercury and the shortcoming that can not effectively purify element state mercury, a kind of chemical agent and the preparation method and purification method that can purify gaseous mercury in the flue gas is provided, it can effectively purify oxidation state mercury in the flue gas, can efficiently purify element state mercury again.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of chemical agent that can purify gaseous mercury in the flue gas of the present invention, described chemical agent is the alkaline solution that contains the sodium polysulfide of 2～6 sulphur atoms or contain the sodium polysulfide of 2～6 sulphur atoms, and the mass percent of element sulphur in the sodium polysulfide molecule is 41%-81%.
The present invention discloses the preparation method of described chemical agent, with industrial sodium sulfide or sulphur is raw material, carry out chemical reaction with basic agent, the weight portion proportioning of reaction raw materials is vulcanized sodium: NaOH=2～6: 1 or sulphur: NaOH=2～6: 1, reaction temperature is 50～250 ℃, reaction time is 1～3 hour, produces the sodium polysulfide solution or the powder that contain 2～6 sulphur atoms.
Perhaps, be raw material with technical grade sodium polysulfide solution or powder, handle through aqueous slkali, 50～250 ℃ of reaction temperatures, the reaction time is 1～3 hour, cool to room temperature obtains containing the sodium polysulfide solution or the powder of 2～6 sulphur atoms.
The described sodium polysulfide that contains 2～6 sulphur atoms is dissolved in the alkaline solution, makes the alkaline solution of the sodium polysulfide that contains 2～6 sulphur atoms.
Described basic agent is NaOH, calcium hydroxide, sodium carbonate or sodium acid carbonate.
The present invention discloses a kind of application process of described chemical agent, the alkaline solution that will contain the sodium polysulfide of 2～6 sulphur atoms sprays in the flue gas by rotary sprayer, can effectively remove gaseous mercury, reaches the purpose that purifies flue gas.
The mercury that the present invention can be converted into particulate form efficiently with the elementary gas mercury that discharges in fuel or the incineration of waste process and oxidation state mercury, thus can be captured and remove by cleaner is efficient.
The present invention has following characteristics:
(1) difference of forming according to gaseous mercury in the flue gas and the difference of mercury purification efficiency, the percentage of sulphur atom can be controlled as required in the sodium polysulfide, and scope can from 41% to 81% wait.
(2) spray adds flue gas behind the sodium polysulfide aqueous slkali and can purify through dry type or wet scrubber and remove the mercury that has been converted into particulate form.
(3) the sodium polysulfide medicament comprises the aqua and the solid state powder of various concentration.
(4) the present invention can efficiently purify the gaseous mercury in the flue gas, comprises the mercury of oxidation state and element state, and process equipment is simple in structure as sodium polysulfide aqueous slkali spray tower, and operation is convenient.
Description of drawings
Fig. 1 is the molecular structure that chemical agent of the present invention contains the sodium polysulfide of 2～6 sulphur atoms, and the excursion of element sulphur shared quality percentage in molecule.
Fig. 2 is the process flow diagram that chemical agent of the present invention contains the sodium polysulfide application example of 2～6 sulphur atoms.
Among the figure: 1. the flue gas after boiler cooling 2. contains the sodium polysulfide alkaline solution of 2～6 sulphur atoms, 3. rotary atomizer, 4. sodium polysulfide alkali lye spray tower, 5. dust removal installation.
The specific embodiment
With the industrial sodium sulfide is raw material, carries out chemical reaction with NaOH, and the weight portion proportioning of reaction raw materials is vulcanized sodium: NaOH=2: 1, and reaction temperature is 50 ℃, the reaction time is 3 hours, produces the sodium polysulfide powder that contains 2～6 sulphur atoms.
With the industrial sodium sulfide is raw material, carries out chemical reaction with basic agent, and the weight portion proportioning of reaction raw materials is vulcanized sodium: NaOH=6: 1, and reaction temperature is 250 ℃, the reaction time is 1 hour, produces the sodium polysulfide solution that contains 2～6 sulphur atoms.
With the industrial sulphur is raw material, carries out chemical reaction with basic agent, and the weight portion proportioning of reaction raw materials is sulphur: NaOH=2: 1, and reaction temperature is 100 ℃, the reaction time is 2 hours, produces the sodium polysulfide powder that contains 2～6 sulphur atoms.
With sulphur is raw material, carries out chemical reaction with basic agent, and the weight portion proportioning of reaction raw materials is sulphur: NaOH=6: 1, and reaction temperature is 200 ℃, the reaction time is 2.5 hours, produces the sodium polysulfide solution that contains 2～6 sulphur atoms.
With technical grade sodium polysulfide solution or powder is raw material, handles 2 hours down at 100 ℃ through 5% sodium hydroxide solution, and cool to room temperature obtains containing the sodium polysulfide solution of 2～6 sulphur atoms.
With technical grade sodium polysulfide solution or powder is raw material, handles 2 hours down at 50 ℃ through 20% sodium hydroxide solution, and cool to room temperature obtains containing the sodium polysulfide powder of 2～6 sulphur atoms.
The chemical agent that can purify gaseous mercury in the flue gas that embodiment 1-embodiment 6 makes, for containing the sodium polysulfide of 2～6 sulphur atoms, the mass percent of element sulphur in the sodium polysulfide molecule is 41%-81%.
The sodium polysulfide that contains 2～6 sulphur atoms of embodiment 1-embodiment 6 preparations is dissolved in the alkaline solution, makes the alkaline solution of the sodium polysulfide that contains 2～6 sulphur atoms.
Embodiment 7
Described dust removal installation can be sack cleaner, electrostatic precipitator or wet scrubber etc.
The chemical agent of embodiment of the invention 1-embodiment 6 preparations is pressed embodiment 7 methods and is used, and can remove the oxidation state mercury more than 85% in the flue gas, and the element state mercury about 90%.
It should be noted that at last: obviously, the foregoing description only is for example of the present invention clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among protection scope of the present invention.
Claims (6)
1. chemical agent that can purify gaseous mercury in the flue gas, it is characterized in that: described chemical agent is the alkaline solution that contains the sodium polysulfide of 2～6 sulphur atoms or contain the sodium polysulfide of 2～6 sulphur atoms, and the mass percent of element sulphur in the sodium polysulfide molecule is 41%-81%.
2. the preparation method of chemical agent as claimed in claim 1, it is characterized in that: with industrial sodium sulfide or sulphur is raw material, carry out chemical reaction with basic agent, the weight portion proportioning of reaction raw materials is vulcanized sodium: NaOH=2～6: 1 or sulphur: NaOH=2～6: 1, reaction temperature is 50～250 ℃, reaction time is 1～3 hour, produces the sodium polysulfide solution or the powder that contain 2～6 sulphur atoms.
3. the preparation method of chemical agent as claimed in claim 1, it is characterized in that: with technical grade sodium polysulfide solution or powder is raw material, handle through aqueous slkali, 50～250 ℃ of reaction temperatures, reaction time is 1～3 hour, cool to room temperature obtains containing the sodium polysulfide solution or the powder of 2～6 sulphur atoms.
4. as the preparation method of claim 2 or 3 described chemical agents, it is characterized in that: the described sodium polysulfide that contains 2～6 sulphur atoms is dissolved in the alkaline solution, makes the alkaline solution of the sodium polysulfide that contains 2～6 sulphur atoms.
5. the preparation method of chemical agent as claimed in claim 4, it is characterized in that: described basic agent is NaOH, calcium hydroxide, sodium carbonate or sodium acid carbonate.
6. the application process of chemical agent as claimed in claim 1, it is characterized in that: the alkaline solution that will contain the sodium polysulfide of 2～6 sulphur atoms sprays in the flue gas by rotary sprayer, can effectively remove gaseous mercury, reaches the purpose that purifies flue gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010166723 CN101816892A (en) | 2010-05-10 | 2010-05-10 | Chemical agent capable of purifying gaseous mercury in smoke, preparation method and purifying method |
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| CN 201010166723 CN101816892A (en) | 2010-05-10 | 2010-05-10 | Chemical agent capable of purifying gaseous mercury in smoke, preparation method and purifying method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110844886A (en) * | 2019-12-02 | 2020-02-28 | 锦西化工研究院有限公司 | Synthetic method of sodium disulfide aqueous solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039834A (en) * | 1988-07-25 | 1990-02-21 | 日擇株式会社 | From liquid hydrocarbon, remove the method for mercury |
| CN101214431A (en) * | 2007-01-04 | 2008-07-09 | 刘阳生 | Combustion process gaseous mercury purifying technique |
| CN101671606A (en) * | 2009-09-29 | 2010-03-17 | 大连三达奥克化学股份有限公司 | Alkaline cleaner for removing simple substance mercury in natural gas separator and cleaning technique thereof |
-
2010
- 2010-05-10 CN CN 201010166723 patent/CN101816892A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039834A (en) * | 1988-07-25 | 1990-02-21 | 日擇株式会社 | From liquid hydrocarbon, remove the method for mercury |
| CN101214431A (en) * | 2007-01-04 | 2008-07-09 | 刘阳生 | Combustion process gaseous mercury purifying technique |
| CN101671606A (en) * | 2009-09-29 | 2010-03-17 | 大连三达奥克化学股份有限公司 | Alkaline cleaner for removing simple substance mercury in natural gas separator and cleaning technique thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110844886A (en) * | 2019-12-02 | 2020-02-28 | 锦西化工研究院有限公司 | Synthetic method of sodium disulfide aqueous solution |
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Application publication date: 20100901 |