CN105879579B - A kind of method and system realized station boiler and reduce heavy metal and NOx pollutant emission - Google Patents
A kind of method and system realized station boiler and reduce heavy metal and NOx pollutant emission Download PDFInfo
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- CN105879579B CN105879579B CN201410691568.2A CN201410691568A CN105879579B CN 105879579 B CN105879579 B CN 105879579B CN 201410691568 A CN201410691568 A CN 201410691568A CN 105879579 B CN105879579 B CN 105879579B
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- boiler
- pyrolysis oven
- activation
- heavy metal
- pyrolysis
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 18
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 18
- 238000000197 pyrolysis Methods 0.000 claims abstract description 45
- 239000000571 coke Substances 0.000 claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 33
- 230000004913 activation Effects 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000356 contaminant Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 7
- 239000003463 adsorbent Substances 0.000 claims description 6
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 claims 1
- 238000001556 precipitation Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 19
- 229910052753 mercury Inorganic materials 0.000 description 19
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008645 Chenopodium bonus henricus Nutrition 0.000 description 1
- 244000138502 Chenopodium bonus henricus Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-M iodate Chemical compound [O-]I(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-M 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 210000000952 spleen Anatomy 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Abstract
The invention discloses a kind of method and system realized station boiler and reduce heavy metal contaminants discharge for belonging to flue gas pollutant control technology field.In the system, raw coal is delivered to pyrolysis oven and coal pulverizer through belt, and pyrolysis oven top exit is connected to boiler-burner, and pyrolysis oven outlet at bottom connects activation furnace, and activation furnace connects modifying machine, and modifying machine connects boiler flue by pipeline and spraying system.Specific method is to be pyrolyzed boiler part fire coal by pyrolysis oven, pyrolysis furnace bottom coke is delivered to activation furnace through discharge system and carries out high-temperature activation, activated coke after activation is modified by modifying machine, then injection pipe is delivered to by Pneumatic conveying pipeline, modified active coke is sprayed into boiler flue by injection pipe, the heavy metal contaminants etc. in flue in activated coke adsorbing and removing flue gas.The discharge of heavy metal in boiler smoke is effectively reduced in the present invention.
Description
Technical field
The invention discloses belong to flue gas pollutant control technology field a kind of realization station boiler reduce heavy metal and
The method and system of NOx pollutant emission.Specifically sprayed after modified as adsorbent using the activated coke that pyrolysis oven is pyrolyzed
It is incident upon in flue, pyrolysis gas boiler of feeding fires again, achievees the purpose that reduce heavy metal contaminants and NOx emission.
Technical background
China is big coal country, the world, while being also coal-fired big country, 36.1 hundred million tons of Chinese coal total quantity consumed in 2013.Coal
In NOx and trace heavy metals (mercury, arsenic, lead, cadmium, chromium) largely discharge.Heavy metal has enriching, is difficult in the environment
It is harmful to human health and ecological environment to be discharged into extraneous heavy metal and its compound for degradation.By taking mercury as an example, coal-fired electricity
The mercury that the flue gases such as factory are discharged is the main source of atmosphere mercury pollution, will form a large amount of gaseous mercuries, gaseous mercury in coal combustion process
It can be discharged into atmosphere together with flue gas.It is newly increased in " fossil-fuel power plant atmospheric pollutant emission standard " that in January, 2012 implements
The discharge index of mercury is, it is specified that the emission limit of power plants mercury and mercuric compounds is 0.03mg/m3.Therefore, it is necessary to reinforce
Reasonable mercury control approach is further explored in the correlative study of coal-burning power plant's mercury pollution emission control, and exploitation is efficient, passes through
Ji, environmentally friendly mercury oxidation catalyst, this has far-reaching significance the following coal-burning power plant, China mercury control.
Currently, coal-fired mercury pollution control mainly passes through following 3 kinds of modes: demercuration before burning, in burning after demercuration and burning
Demercuration.Mercury is separated from raw coal mainly by the washing and heat treatment for raw coal and is not involved in burning by demercuration before burning；
Demercuration in burning mainly inhibits the discharge of a part of mercury while reducing NOx using improvement combustion system；It is taken off after burning
Mercury is optimized in addition to cooperation-removal gaseous mercury except using the existing smoke gas treatment equipment of power plant, is sprayed in boiler back end ductwork
Modified demercuration adsorbent can effectively reduce the content of mercury in flue gas.
Activated coke is using lignite as a kind of with the particulate matter for adsorbing and being catalyzed dual property of primary raw material.Activated coke
The characteristics of active charcoal, but it overcomes the shortcomings that active carbon price is high, mechanical strength is low, easy crushing again simultaneously.It is modified
Activated coke load have modifying agent, greatly improve the ability of Adsorption of Mercury.
1715471 A of Chinese patent CN discloses a kind of modified active coke and its preparation method and application.The invention provides
Modified active coke preparation method, the modifying agent be Bromide, bromate, iodized salt, iodate, chlorate and chlorate
At least one of.The method of modifying is suitable for the research of laboratory scale, but more difficult meets the biggish coal-burning power plant of exhaust gas volumn
The amount of injection of the adsorbent Deng needed for.Therefore, how to carry out extensive modification to adsorbent in coal-burning power plant is that current urgent need solves
The problem of.
A kind of method of purifying flue gas by use of powdered activated coke of Chinese patent CN 1864809 A disclosure of the invention.The invention
Provided method is that the flue gas containing pollutant is removed pollution therein by being injected with the flue of powdered activated coke
Object, the powdered activated coke for adsorbing pollutant are collected with deduster, are purified flue gas；Wherein, the injection of the powdered activated coke
Amount is 50-20000mg activated coke/m3Flue gas.This injection apparatus realizes the on-line continuous injection of powdered activated coke, but activated coke
Preparation and injection of separation, realized in different places, be not carried out the coupling of technique.
In addition, the fluctuation of growing coal demand and coal market especially electricity coal supply, so that tradition meaning
The utilization for being not suitable for the low-grade coal such as lignite to burn on a large scale as fuel in justice increasingly attracts people's attention, adjoint
Pollutant emission control in its combustion process is critically important project.
Summary of the invention
The purpose of the present invention is to propose to a kind of method for realizing station boiler reduction heavy metal and NOx pollutant emission and it is
System.In this method, the fire coal of part boiler load is pyrolyzed by pyrolysis oven, the pyrolysis gas purification that pyrolysis oven top exit generates
After be transported in boiler recombustion burner fire again reduce NOx disposal of pollutants；Pyrolysis furnace bottom residual coke is conveyed through discharge system
High-temperature activation is carried out to activation furnace, the activated coke after activation is modified by modifying machine, through break process then by Pneumatic conveying pipeline
It is delivered to after denitration at injection pipe, is uniformly sprayed into modified active coke in boiler flue by injection pipe, to realize
Heavy metal contaminants etc. in adsorbing and removing flue gas.
The feed coal that the pyrolysis oven pyrolysis generates pyrolysis gas once passes through pyrolysis oven, no cyclic process, and pyrolysis generates heat
It vents one's spleen to be transported in boiler recombustion burner and fire again.
The pyrolysis furnace bottom coke is delivered to activation furnace through discharge system and carries out high-temperature activation, activated coke after activation by
Modifying machine is modified, no cooling link.
The modified activated coke is delivered to injection pipe by Pneumatic conveying pipeline, and uniform spray into flue is adsorbed
Remove the heavy metal contaminants etc. in flue gas.
A kind of system realized station boiler and reduce heavy metal and NOx pollutant emission, which is characterized in that after raw coal is selected
Coal pulverizer 2 and pyrolysis oven 3 are delivered to through belt 1, and coal pulverizer 2 is by being connected to the main fuel burner of boiler 6 through First air channel
7-1, the purified system of 3 top exit of pyrolysis oven are connected to boiler recombustion burner 7-2, and 3 outlet at bottom of pyrolysis oven is connected to work
Change furnace entrance 4；Activation furnace 4 connects modifying machine 5, and modifying machine 5 connects injection pipe 9 by the road.
The injection pipe 9 is arranged after selective catalytic reduction denitration device, the modified active coke adsorbent of injection
Conducive to the removing of electric precipitator 10.
The beneficial effect comprise that
By to the modified injection in boiler flue of the activated coke for being pyrolyzed generation in pyrolysis oven, can obtain 90% with
On demercuration efficiency, reduce the discharge of the heavy metals such as mercury；By to pyrolysis gas in pyrolysis oven in boiler recombustion burner again
Combustion, can obtain beneficial denitration effect.The technology of the present invention equipment is simple, easily implementation, operating cost is low.
Detailed description of the invention
Fig. 1 is embodiment system schematic.
In figure: 1 is coal conveyer belt, and 2 be coal pulverizer, and 3 be pyrolysis oven, and 4 be activation furnace, and 5 be modifying machine, and 6 be boiler, 7-1
It is boiler main burner, 7-2 is boiler recombustion burner, and 9 be injection pipe, and 10 be electric precipitator.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
The invention proposes propose a kind of to realize that station boiler reduces the method for heavy metal and NOx pollutant emission and is
System, as shown in Figure 1.Partial fuel coal is pyrolyzed by raw coal through coal conveyer belt 1 by pyrolysis oven 3 in embodiment, and the product after pyrolysis has
Two parts: a part is gaseous product pyrolysis gas, and a part is solid product activated coke.Pyrolysis gas is by 3 top exit of pyrolysis oven
It send through connection to boiler recombustion burner 7-2, the fuel as recombustion burner；3 bottom coke of pyrolysis oven is defeated through discharge system
It send to activation furnace 4 and carries out high-temperature activation, the activated coke after activation is modified by modifying machine 5, is then delivered to by Pneumatic conveying pipeline
At injection pipe 9, and the heavy metal contaminants etc. in boiler flue in adsorbing and removing flue gas are uniformly sprayed by injection pipe.
The present invention can be summarized with others without prejudice to the concrete form of spirit or central characteristics of the invention.Therefore, originally
The embodiment above of invention can only all be considered the description of the invention and cannot limit the present invention, and claims indicate
The scope of the present invention, and above-mentioned explanation does not point out the scope of the present invention all.Therefore, with claims of the present invention
Any change in comparable meaning and scope, is all considered as being included within the scope of the claims.
Claims (4)
1. a kind of method realized station boiler and reduce heavy metal and NOx pollutant emission, which is characterized in that fire part boiler
Coal is pyrolyzed by pyrolysis oven, and the pyrolysis gas that pyrolysis oven top exit generates, which is transported in boiler recombustion burner to fire again, reduces NOx
Disposal of pollutants；Pyrolysis furnace bottom coke is delivered to activation furnace through discharge system and carries out high-temperature activation, and the activated coke after activation is by changing
Property machine it is modified, injection pipe is then delivered to by Pneumatic conveying pipeline, by the injection pipe uniformly by modified active
Coke sprays into boiler flue, to realize the heavy metal contaminants in adsorbing and removing flue gas；
Wherein, the pyrolysis furnace bottom coke is delivered to activation furnace through discharge system and carries out high-temperature activation, the activated coke after activation
It is modified by modifying machine, no cooling link；The injection pipe is arranged after selective catalytic reduction denitration device.
2. realizing the method that station boiler reduces heavy metal and NOx pollutant emission according to claim 1, feature exists
In, the pyrolysis oven be pyrolyzed generate pyrolysis gas feed coal once pass through pyrolysis oven, no cyclic process.
3. realizing the method that station boiler reduces heavy metal and NOx pollutant emission according to claim 1, system features
It is, raw coal is delivered to coal pulverizer (2) and pyrolysis oven (3) through belt (1), and the coal pulverizer (2) connects pot by First air channel
The main fuel burner (7-1) of furnace (6), pyrolysis oven (3) top exit is connected to boiler recombustion burner (7-2), described
Pyrolysis oven (3) outlet at bottom connects the entrance of the activation furnace (4)；The activation furnace (4) connects modifying machine (5), the modification
Machine (5) connects injection pipe (9).
4. being for realizing what realization station boiler as claimed in claim 3 reduced the method for heavy metal and NOx pollutant emission
System, which is characterized in that
The system is equipped with belt (1), coal pulverizer (2), pyrolysis oven (3), activation furnace (4), modifying machine (5), boiler (6), main combustion
Gas turbine liquid-fuel burner (7-1), boiler recombustion burner (7-2), selective catalytic reduction denitration device, injection pipe (9) and electric precipitation
Device (10)；
Through belt (1) conveying raw coal to coal pulverizer (2) and pyrolysis oven (3), the coal pulverizer (2) is connected raw coal by First air channel
The main fuel burner (7-1) of boiler (6), pyrolysis oven (3) top exit are connected to boiler recombustion burner (7-2), institute
State the entrance that pyrolysis oven (3) outlet at bottom connects the activation furnace (4)；The activation furnace (4) connects modifying machine (5), described to change
Property machine (5) connect injection pipe (9)；
The injection pipe (9) is arranged after selective catalytic reduction denitration device, the modified active coke adsorbent benefit of injection
Removing in electric precipitator (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691568.2A CN105879579B (en) | 2014-11-26 | 2014-11-26 | A kind of method and system realized station boiler and reduce heavy metal and NOx pollutant emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691568.2A CN105879579B (en) | 2014-11-26 | 2014-11-26 | A kind of method and system realized station boiler and reduce heavy metal and NOx pollutant emission |
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| Publication Number | Publication Date |
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| CN105879579A CN105879579A (en) | 2016-08-24 |
| CN105879579B true CN105879579B (en) | 2019-10-11 |
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| CN201410691568.2A Active CN105879579B (en) | 2014-11-26 | 2014-11-26 | A kind of method and system realized station boiler and reduce heavy metal and NOx pollutant emission |
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| CN111111430B (en) * | 2019-12-19 | 2022-04-01 | 华电电力科学研究院有限公司 | SCR denitration regulation control method for urea pyrolysis furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269402A (en) * | 2011-07-08 | 2011-12-07 | 华北电力大学 | Method and system for realizing NOx discharge reduction and stable combustion of power station boiler |
| CN102350214A (en) * | 2011-06-29 | 2012-02-15 | 山东大学 | Coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and technology |
| CN102563690A (en) * | 2012-02-08 | 2012-07-11 | 河南电力试验研究院 | Method for controlling emission of nitrogen oxide of coal burning boiler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2940659B2 (en) * | 1994-08-30 | 1999-08-25 | 川崎重工業株式会社 | Method and apparatus for treating incinerator exhaust gas |
| US6599118B2 (en) * | 2001-02-28 | 2003-07-29 | The Penn State Research Foundation | Method and system for reducing nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions |
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- 2014-11-26 CN CN201410691568.2A patent/CN105879579B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350214A (en) * | 2011-06-29 | 2012-02-15 | 山东大学 | Coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and technology |
| CN102269402A (en) * | 2011-07-08 | 2011-12-07 | 华北电力大学 | Method and system for realizing NOx discharge reduction and stable combustion of power station boiler |
| CN102563690A (en) * | 2012-02-08 | 2012-07-11 | 河南电力试验研究院 | Method for controlling emission of nitrogen oxide of coal burning boiler |
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| CN105879579A (en) | 2016-08-24 |
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Inventor after: Wang Shumin Inventor after: Zhang Yongsheng Inventor after: Liu Zhao Inventor after: Li Wenhan Inventor after: Wang Jiawei Inventor after: Pan Weiping Inventor before: Zhang Yongsheng Inventor before: Liu Zhao Inventor before: Li Wenhan Inventor before: Wang Jiawei Inventor before: Pan Weiping |
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Effective date of registration: 20190724 Address after: 100011 Beijing, Dongcheng District Anwai Binhe West Road No. 22 Shenhua building Applicant after: China Shenhua Energy Co., Ltd. Applicant after: North China Electric Power University Address before: 102206 Changping District North Road, No. 2, Beijing Applicant before: North China Electric Power University |
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