CN101502737A - Method and device for removing heavy metal mercy in fire coal flue gas by carbon powder treated by brominating process - Google Patents
Method and device for removing heavy metal mercy in fire coal flue gas by carbon powder treated by brominating process Download PDFInfo
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- CN101502737A CN101502737A CNA2009100456352A CN200910045635A CN101502737A CN 101502737 A CN101502737 A CN 101502737A CN A2009100456352 A CNA2009100456352 A CN A2009100456352A CN 200910045635 A CN200910045635 A CN 200910045635A CN 101502737 A CN101502737 A CN 101502737A
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Abstract
The invention relates to a method for removing heavy metal mercury from fire coal fume by bromized carbon powder and a device thereof, belonging to the field of fume purification. When the method is used for purifying fume, the fire coal fume passes through the fume entrance and enters the entrance section of bromized carbon powder to be fully mixed with the bromized carbon powder sprayed from the entrance section, the heavy metal mercury is removed by using the absorption action of the bromized carbon powder, the processed fume enters a bag type filter of a filtration bag made of carbon doped fiber through a connecting tube to remove the inhalable particles and heavy metal mercury from the fire coal fume as well as the bromized carbon powder used as the sorbent in the fume removal. The purified gas processed by the bag type filter is discharged through a purified gas exit on the bag type filter, the material collected in an ash hopper at the lower end of the bag type filter can be used repeatedly, thus enhancing the effective utilization rate of the material, saving the operation cost of the system and having the advantages of simple structure, small occupied area, low investment cost, convenient operation, etc.
Description
Technical field
The present invention relates to heavy metal removing method and device in the coal-fired flue-gas, belong to filed of flue gas purification.
Background technology
Heavy metal Hg receives much concern as a kind of very important global contaminant, even under the low-down situation of concentration, it all has sizable toxicity to human and wild animals and plants, in the atmospheric environment source of mercury except that a part from outside (for example colcanism and mineral reserve discharge) the natural discharging, from human activity, wherein the mercury that coal combustion discharged just occupies bigger ratio (more than 30%) greatly.
China's primary energy, will remain unchanged in very long from now on a period of time based on fire coal.Annual 84% of the coal of producing of China is directly used in burning, so it is more outstanding that coal-fired Hg pollutes, human health and environment there is obvious harm, Hg and compound thereof can pass through different approaches such as respiratory tract, skin and alimentary canal and invade human body, cause nerve to poison and the deep tissue pathology, and mercury toxicity has accumulation, often needs several years or just performance to some extent of more than ten years, so coal-fired mercury pollution is more and more paid attention to by people.Present pollution control technology and equipment are difficult to remove the heavy metal in the coal-fired flue-gas, and its pollution has caused economy difficult to the appraisal and social loss, are badly in need of being administered and controlling, and have become global problem.
In view of the serious harm of heavy metal in the coal-fired flue-gas, find a kind of control technology that can remove heavy metal in the coal-fired flue-gas effectively extremely urgent.
Present coal-fired mercury pollution control is mainly by following 3 kinds of modes: demercuration and burning back demercuration in the preceding demercuration of burning, the burning.The demercuration technology mainly comprises the heat treatment technics of coal washing technology and coal before the burning, but efficient is all lower.Research about demercuration in the burning is less, mainly is to utilize to improve combustion system, when reducing NOx, suppresses the discharging of sub-fraction mercury.Heavy metal Hg in the main demercuration absorbent absorption of the burning back demercuration flue gas, as employing zeolite, activated carbon, flying dust, calcium-base absorbing agent, but removal efficiency is all lower.Wherein spraying into activated carbon before the flue dust control system is a kind of having a extensive future and technology with low cost, but directly adopt the method cost of original active carbon adsorption higher, and original activated carbon is not very high to the adsorption efficiency of heavy metal Hg in the flue gas, and the coal-burning power plant is difficult to bear.
In addition, be used for coal-fired flue gases purification at present, as flue gas ash removal, flue gas desulfurization, denitrating flue gas with to remove heavy metal etc. mostly be to carry on technical development separately, form separately technical system and technological process, in present domestic and international coal-burning power plant, in order to remove particle in the flue gas and heavy metal etc., most independently dust separation systems that adopt more than at least two covers, there are shortcomings such as occupation area of equipment is big, cost of investment is high, complicated operation in this flue gas purification system.
Summary of the invention
Have for solving existing gas cleaning that occupation area of equipment is big, cost of investment is high, the shortcoming of complicated operation, and provide a kind of carbon dust of handling with bromination to remove the method and the device of heavy metal Hg in the coal-fired flue-gas.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of carbon dust of handling with bromination removes the method for heavy metal Hg in the coal-fired flue-gas, the steps include:
(1) utilize nitrogen as carrier gas, bromine vapor is delivered to the container that fills a certain amount of activated carbon powder, and stir improving the uniformity of bromine load, preparation has the carbon dust that the bromination of good adsorption effect was handled to heavy metal Hg;
(2) flue gas enters the carbon dust entrance section (3) that bromination was handled through smoke inlet (1), and the carbon dust that the bromination that sprays into the carbon dust entrance of being handled by bromination (2) was handled carries out suction-operated, removes the heavy metal Hg in the flue gas;
(3) flue gas after the processing enters bag filter (7), and the filter bag of making through the carbon dope fiber filters, and can further remove the heavy metal in the flue gas, can remove simultaneously and spray into the carbon dust that the bromination in the flue gas was handled;
(4) material of collecting in the bag filter ash bucket (6) can separate, and is recycling, improves effective utilization ratio of material.
The preparation technology of the carbon dust that described bromination was handled: utilize nitrogen as carrier gas, bromine vapor is delivered to the container that fills a certain amount of activated carbon powder, and stir to improve the uniformity of bromine load, can make heavy metal Hg is had the carbon dust that the bromination of good adsorption effect was handled;
The straying quatity of the carbon dust that described bromination is handled can be controlled according to the situation that inlet flue gas detects.
Implement the device that a kind of carbon dust of handling with bromination removes heavy metal Hg method in the coal-fired flue-gas, comprise smoke inlet (1), the carbon dust entrance (2) that bromination was handled, the carbon dust entrance section (3) that bromination was handled, tube connector (4), dusty gas inlet (5), bag filter (7), it is characterized in that, the carbon dust entrance (2) that smoke inlet (1) and bromination were handled is connected on the carbon dust entrance section (3) that bromination handled, one end of tube connector (4) is connected on the carbon dust entrance section (3) that bromination handled, the other end is connected on the bag filter (7) by the inlet of the dusty gas on the bag filter (7) (5), the lower end of bag filter (7) is connected with ash bucket (6), and the upper end is provided with purified gas outlet (8).
The filter bag of described bag filter (7) adopts the carbon dope fiber to make.
The present invention compared with prior art has the following advantages:
(1) uses and heavy metal is had carbon dust that the bromination of good adsorption effect handled remove heavy metal in the flue gas, can significantly improve demercuration efficient, reduce the operating cost of system effectively;
(2) filter bag of bag filter is made by the carbon dope fiber, the carbon dope fiber filtering has abundant microporous, activity and bigger specific area, when flue gas is filtered, can remove pellet and heavy metal in the flue gas, can remove simultaneously and spray into the carbon dust that the bromination that is used as adsorbent in the flue gas was handled;
(3) material of collecting in the bag filter ash bucket can carry out recyclingly, has improved effective utilization ratio of material, has reduced the operating cost of system;
(4) realize that the device of this method is simple, floor space is little, and cost is lower, and easy operating is safe and reliable to operation.
Description of drawings
Accompanying drawing is the concrete structure schematic diagram of the embodiment of the invention.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
As shown in Figure 1, implement the device that a kind of carbon dust of handling with bromination removes heavy metal Hg method in the coal-fired flue-gas and comprise smoke inlet (1), the carbon dust entrance (2) that bromination was handled, the carbon dust entrance section (3) that bromination was handled, tube connector (4), dusty gas inlet (5), bag filter (7), it is characterized in that, the carbon dust entrance (2) that smoke inlet (1) and bromination were handled is connected on the carbon dust entrance section (3) that bromination handled, one end of tube connector (4) is connected on the carbon dust entrance section (3) that bromination handled, the other end is connected on the bag filter (7) by the inlet of the dusty gas on the bag filter (7) (5), the lower end of bag filter (7) is connected with ash bucket (6), and the upper end is provided with purified gas outlet (8).
A kind of carbon dust of handling with bromination of the present invention removes the method for heavy metal Hg in the coal-fired flue-gas when flue gas is purified, coal-fired flue-gas enters the carbon dust entrance section (3) that bromination was handled by smoke inlet (1), the carbon dust of handling with the bromination that the carbon dust entrance section of being handled by bromination (3) sprays into mixes fully, the carbon dust that bromination was handled utilizes its suction-operated to remove heavy metal Hg in the coal-fired flue-gas, flue gas after treatment enters the bag filter (7) that adopts the carbon dope fiber to make filter bag by tube connector (4), can remove pellet and heavy metal Hg in the flue gas, can remove simultaneously and spray into the carbon dust that the bromination that is used as adsorbent in the flue gas was handled.Discharge by the purified gas outlet (8) on the bag filter (7) through the Purge gas that bag filter is handled, the material that the ash bucket (6) of bag filter (7) lower end is collected can reuse, improve effective utilization ratio of material, to save the operating cost of system.The inventive method removes in the coal-fired flue-gas in the heavy metal Hg process, the straying quatity of the carbon dust that can handle according to the situation control bromination that the inlet coal-fired flue-gas detects.
Because the carbon dust handled of bromination has suction-operated preferably to the mercury in the flue gas, utilize carbon dust that bromination handled as adsorbent among the present invention, control for the mercury pollution of the coal-fired flue-gas that hangs down mercury concentration and have special advantages.Before coal-fired flue-gas enters bag filter, spray into the carbon dust that bromination was handled, remove the mercury in the flue gas effectively.Filtrate in the bag filter adopts the carbon dope fiber to make, and the carbon dope fiber filtering has abundant microporous, activity and bigger specific area, can reach the purpose that particle and mercury remove simultaneously when carrying out smoke filtration, thereby further removes mercury vapour.That the device of realizing this method in addition has is simple in structure, floor space is little, cost of investment is low, advantage such as easy to operate.Facts have proved, the carbon dust that bromination was handled has better adsorption capability to simple substance mercury, its adsorption capacity increases with the negative quantity of bromine, and negative quantity is 0.33% o'clock, and the adsorption capacity of simple substance mercury reaches 0.2mg/g, be about 80 times of original activity carbon, relative adsorption coefficient is 40 times of activated carbon itself approximately, and its removal efficiency reaches more than 90%, has significantly controlled the mercury emissions of coal-fired flue-gas, operating cost greatly reduces, obvious environment benefit.
Claims (5)
1. a carbon dust of handling with bromination removes the method for heavy metal Hg in the coal-fired flue-gas, the steps include:
(1) utilize nitrogen as carrier gas, bromine vapor is delivered to the container that fills a certain amount of activated carbon powder, and stir improving the uniformity of bromine load, preparation has the carbon dust that the bromination of good adsorption effect was handled to heavy metal Hg;
(2) flue gas enters the carbon dust entrance section (3) that bromination was handled through smoke inlet (1), and the carbon dust that the bromination that sprays into the carbon dust entrance of being handled by bromination (2) was handled carries out suction-operated, removes the heavy metal Hg in the coal-fired flue-gas;
(3) flue gas after handling enters bag filter (7), and the filter bag of making through the carbon dope fiber filters, and can further remove the heavy metal in the flue gas, can remove simultaneously to spray into the carbon dust that the bromination that is used as adsorbent in the flue gas was handled;
(4) material of collecting in the bag filter ash bucket (6) can separate, and is recycling, improves effective utilization ratio of material.
2. realize that the described a kind of carbon dust of handling with bromination of claim 1 removes the method for heavy metal Hg in the coal-fired flue-gas, it is characterized in that: the preparation technology of the carbon dust that described bromination was handled: utilize nitrogen as carrier gas, bromine vapor is delivered to the container that fills a certain amount of activated carbon powder, and stir to improve the uniformity of bromine load, can make heavy metal Hg is had the carbon dust that the bromination of good adsorption effect was handled;
3. realize that the described a kind of carbon dust of handling with bromination of claim 1 removes the method for heavy metal Hg in the coal-fired flue-gas, it is characterized in that the straying quatity of the carbon dust that described bromination is handled can be controlled according to the detection case of inlet coal-fired flue-gas.
4. device of implementing claim 1 method, comprise smoke inlet (1), the carbon dust entrance (2) that bromination was handled, the carbon dust entrance section (3) that bromination was handled, tube connector (4), dusty gas inlet (5), bag filter (7), it is characterized in that, the carbon dust entrance (2) that smoke inlet (1) and bromination were handled is connected on the carbon dust entrance section (3) that bromination handled, one end of tube connector (4) is connected on the carbon dust entrance section (3) that bromination handled, the other end is connected on the bag filter (7) by the inlet of the dusty gas on the bag filter (7) (5), the lower end of bag filter (7) is connected with ash bucket (6), and the upper end is provided with purified gas outlet (8).
5. a kind of device of implementing claim 1 method according to claim 4 is characterized in that, the filter bag of described bag filter (7) adopts the carbon dope fiber to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100456352A CN101502737A (en) | 2009-01-21 | 2009-01-21 | Method and device for removing heavy metal mercy in fire coal flue gas by carbon powder treated by brominating process |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100456352A CN101502737A (en) | 2009-01-21 | 2009-01-21 | Method and device for removing heavy metal mercy in fire coal flue gas by carbon powder treated by brominating process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338831A (en) * | 2010-11-22 | 2013-10-02 | 阿尔比马尔公司 | Brominated inorganic sorbents for reduction of mercury emissions |
| CN104475018A (en) * | 2014-11-17 | 2015-04-01 | 贵州大学 | Bromine-loaded carbon adsorbent and preparation method and application thereof |
| CN104707442A (en) * | 2015-03-10 | 2015-06-17 | 中国环境科学研究院 | Method and device for removing metallic mercury in fire coal flue gas |
| CN106475053A (en) * | 2016-11-21 | 2017-03-08 | 东华大学 | The regeneration technology of Formula type adsorbent dry desulfurization denitration demercuration simultaneously |
| CN115475478A (en) * | 2022-09-05 | 2022-12-16 | 南京理工大学 | Symmetrical double-section mercury removal and carbon fixation waste heat recovery integrated device |
-
2009
- 2009-01-21 CN CNA2009100456352A patent/CN101502737A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338831A (en) * | 2010-11-22 | 2013-10-02 | 阿尔比马尔公司 | Brominated inorganic sorbents for reduction of mercury emissions |
| CN104475018A (en) * | 2014-11-17 | 2015-04-01 | 贵州大学 | Bromine-loaded carbon adsorbent and preparation method and application thereof |
| CN104707442A (en) * | 2015-03-10 | 2015-06-17 | 中国环境科学研究院 | Method and device for removing metallic mercury in fire coal flue gas |
| CN106475053A (en) * | 2016-11-21 | 2017-03-08 | 东华大学 | The regeneration technology of Formula type adsorbent dry desulfurization denitration demercuration simultaneously |
| CN115475478A (en) * | 2022-09-05 | 2022-12-16 | 南京理工大学 | Symmetrical double-section mercury removal and carbon fixation waste heat recovery integrated device |
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Application publication date: 20090812 |
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