CN106621712A - Flue gas desulfurization and denitrification process - Google Patents
Flue gas desulfurization and denitrification process Download PDFInfo
- Publication number
- CN106621712A CN106621712A CN201611220457.9A CN201611220457A CN106621712A CN 106621712 A CN106621712 A CN 106621712A CN 201611220457 A CN201611220457 A CN 201611220457A CN 106621712 A CN106621712 A CN 106621712A
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- CN
- China
- Prior art keywords
- flue gas
- vaporizer
- desulfurization
- flue
- ozone generator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides a flue gas desulfurization and denitrification process which comprises the following steps: enabling to-be-purified flue gas to sequentially pass through an oxidation flue and an absorption tower, wherein the oxidation flue is connected with a strong oxidization system; the strong oxidization system comprises a liquid oxygen storage tank, a vaporizer and an ozone generator; the liquid oxygen storage tank is connected with the vaporizer; the vaporizer is connected with the ozone generator; the ozone generator is connected with the oxidation flue; absorption liquid is filled in the absorption tower and is slurry prepared from boiler coal ash rinsing water and a chlorine-containing strong oxidant; the chlorine-containing strong oxidant accounts for 0.1-0.5% of the weight of the boiler coal ash rinsing water; and the absorption liquid passes through the flue gas so as to obtain the treatment solution. According to the method, desulfurization and denitrification can be simultaneously realized, and the desulfurization efficiency and the denitrification efficiency are greatly improved.
Description
Technical field
The invention belongs to fume treatment technical field, and in particular to a kind of flue gas desulfurization and denitration technique.
Background technology
China's atmosphere pollution is very serious, and particularly developed area acid rain frequency is also in increase, and has from sulfuric acid type
To the trend of the compound transformation of sulfonitric, nitrogen oxides may replace oxysulfide to become the main source of acid rain, therefore right
It is very urgent that flue gas carries out simultaneous SO_2 and NO removal.With regard to flue gas desulfurization and denitrification technology, conduct extensive research both at home and abroad with greatly
The engineering practice of scale, but the technique for adopting at present is respectively provided with desulphurization and denitration device in boiler exit gas section mostly, this point
There is big big floor space, system complex and resistance, investment and running cost height, flue gas system stability control and have high demands in level mode
The problems such as.Flue gas and desulfurizing and denitrifying technique is increasingly taken seriously so that its counter investment is few, process is simple.Using existing de-
Sulphur facility realizes that flue gas and desulfurizing and denitrifying even more has and implements fast, the low advantage of investment have good economy and environmental benefit.
Existing wet fuel gas desulfurizing technology, traditionally elder generation's Jing Water spray cooled flue gas, make anti-to tower body into tower cigarette temperature drop
The temperature that rotten material can be tolerated for a long time.At present China's boiler smoke has substantially been built more than desulfurization equipment, and 90% using wet
Method desulfurization, particularly commercial industry boiler, it is de- substantially to adopt with bases such as lime/lime stone, soda and alkaline waste waters
The simply wet constructed technique of sulphur agent.
Consider from the various aspects such as economy, technology factor, typical wet desulfurizing process will occupy main status, because
This, introduces NOx absorber urea and sorbefacient strong oxidizer on existing wet desulfurizing process, makes original wet flue gas
Desulphurization system has denitration function simultaneously, and so as to form the small investment being adapted with China's national situation, operating cost is low, can meet me
The desulfurization and denitrification integral technology of state's discharge standard.
The content of the invention
The present invention proposes a kind of flue gas desulfurization and denitration technique, and the method realizes desulphurization denitration while carrying out, desulfuration efficiency and
Denitration efficiency is improved significantly.
The technical scheme is that what is be achieved in that：
A kind of flue gas desulfurization and denitration technique, is that flue gas to be clean is first passed sequentially through into oxidation exhaust gases passes and absorption tower,
The oxidation exhaust gases passes are connected with Strong oxdiative system, and the Strong oxdiative system includes that liquid oxygen storage tank, vaporizer and ozone occur
Device, the liquid oxygen storage tank is connected with the vaporizer, and the vaporizer is connected with the ozone generator, the ozone generator
It is connected with the oxidation flue, absorbing liquid is provided with the absorption tower, the absorbing liquid is strong with chloride by boiler ash wash slag water
The slurries that oxidant is configured to, the percetage by weight of the chloric strong oxidant is boiler ash wash slag water 0.1～0.5%, is absorbed
Liquid can obtain treatment fluid after the flue gas.
Further, the chloric strong oxidant is sodium chlorite, sodium hypochlorite, calcium chlorite, calcium hypochlorite and bleaching
One or more in powder.
Further, the chloric strong oxidant is sodium hypochlorite.
Further, in some embodiments of the present invention, using sodium hypochlorite as chloric strong oxidant, its treatment fluid is carried out back
Receiving the method for utilizing is：Treatment fluid is carried out filtering and removes solid impurity, after cleaner liquid is separated by crystallization with liquid impurities, adopted
It is water-cooled the MgSO that crystallization generates mm levels4·7H2O crystal grain, or the MgSO of mm levels is directly generated using evaporative crystallization4·H2O is brilliant
Grain；Magma Jing centrifugal dehydrations, the mother liquor major part after separation can return desulfurizing tower by circulating pump.
Further, the solid impurity is the impurity included in flyash and desulfurizing agent.
Further, the boiler ash wash slag water is prepared with chloric strong oxidant slurrying liquid using circulating absorption solution.
Beneficial effects of the present invention：
1st, the present invention is additionally arranged out of stock function on the basis of existing flue gas desulphurization system, without the need for high temperature section, without the need for former cigarette
Gas generating system makees any change, is only additionally arranged a set of Strong oxdiative system, that is, realize it is out of stock to flue gas low-temperature, while by flue gas
In SO2Partial oxidation is SO3, be conducive to subsequent absorption liquid desulfurization, it is to avoid SO2The H of generation2SO3Inverse decomposition.
2nd, chloric strong oxidant is dissolved in water generation ClO-、ClO2-Coordinate etc. strong oxidizing property ion and ozone, can be by NO oxygen
Change, generate NO3-、Cl-Deng product, absorbent is dissolved in water in alkalescent, hydrolyzes the OH for producing-With SO2Reaction generates SO3 2-And SO4 2-
Ion, so as to remove flue gas in NOx and SO2.The chlorine strong oxidizer is combined with boiler ash wash slag water carries out desulfurization more than 98%
Generate Na2SO4, out of stock rate reaches 88%, with regard to carrying out oxidation processes, saving operation, reduction without the need for desulfurization slurry is carried out into oxidizing tower
Cost.
Specific embodiment
Boiler smoke is introduced into after oxidation exhaust gases passes from bottom of towe and enters back into absorption tower Jing after boiler induced-draft fan extraction, follows
The absorbent in ring pond Jing water circulating pump supercharging after, by tower top spray and under, gas-liquid two-phase reverse flow completes SO in tower2、
The removing of NOx, most after Jing after the demisting plate demisting on tower top from chimney high altitude discharge.Absorbing liquid is back to bottom of towe, clarified separation,
Body refuse is periodically outer to be arranged, and supernatant enters circulating water pool reuse.The new absorbent prepared is stored in pond of making up a prescription.When the concentration of absorbent
When declining certain value, start dosing pump, toward circulating water pool dense absorbent is supplemented.
Embodiment 1
Configuration contains 10% boiler ash wash slag water, adds 0.3% sodium hypochlorite to be well mixed to form suspension, as flue gas
The absorbent of wet method simultaneous SO_2 and NO removal, is inversely fully contacted in rotating stream tray scrubber with flue gas, and SO is completed in tower2、NOx
Removing.Flue gas inspection result after purification is shown, 88.5% denitration efficiency and more than 93% desulfuration efficiency can be reached.
Embodiment 2
Configuration contains 6% boiler ash wash slag water, adds 0.06% bleaching powder to be well mixed to form suspension, wet as flue gas
The absorbent of method simultaneous SO_2 and NO removal, is inversely fully contacted in rotating stream tray scrubber with flue gas, and SO is completed in tower2, NOx
Removing.Flue gas inspection result after purification is shown, 90% denitration efficiency and more than 98% desulfuration efficiency can be reached.
Embodiment 3
Configuration contains 8% boiler ash wash slag water, adds 0.22% sodium hypochlorite, 0.1% calcium hypochlorite to be well mixed to be formed
Suspension, as the absorbent of flue gas wet method simultaneous SO_2 and NO removal, is inversely fully contacted in rotating stream tray scrubber with flue gas,
SO is completed in tower2, NOx removing.Flue gas inspection result after purification is shown, can reach 88% denitration efficiency and 98% with
On desulfuration efficiency.
Embodiment 4
Configuration contains 12% boiler ash wash slag water, adds 0.3% sodium hypochlorite, 0.3% sub- sodium hypochlorite to be well mixed shape
Into suspension, as the absorbent of flue gas wet method simultaneous SO_2 and NO removal, inversely it is fully contacted with flue gas in rotating stream tray scrubber,
SO is completed in tower2, NOx removing.Flue gas inspection result after purification is shown, can reach 89% denitration efficiency and
More than 98.6% desulfuration efficiency.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (3)
1. a kind of flue gas desulfurization and denitration technique, it is characterised in that be that flue gas to be clean is first passed sequentially through into oxidation exhaust gases passes
With absorption tower, the oxidation exhaust gases passes are connected with Strong oxdiative system, the Strong oxdiative system include liquid oxygen storage tank, vaporizer with
Ozone generator, the liquid oxygen storage tank is connected with the vaporizer, and the vaporizer is connected with the ozone generator, described smelly
Oxygen Generator is connected with the oxidation flue, and absorbing liquid is provided with the absorption tower, and the absorbing liquid is by boiler ash wash slag water
The slurries being configured to chloric strong oxidant, the percetage by weight of the chloric strong oxidant be boiler ash wash slag water 0.1～
0.5%, absorbing liquid can obtain treatment fluid after the flue gas.
2. flue gas desulfurization and denitration technique according to claim 1, it is characterised in that the chloric strong oxidant is chlorous acid
One or more in sodium, sodium hypochlorite, calcium chlorite, calcium hypochlorite and bleaching powder.
3. flue gas desulfurization and denitration technique according to claim 2, it is characterised in that the chloric strong oxidant is hypochlorous acid
Sodium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611220457.9A CN106621712A (en) | 2016-12-26 | 2016-12-26 | Flue gas desulfurization and denitrification process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611220457.9A CN106621712A (en) | 2016-12-26 | 2016-12-26 | Flue gas desulfurization and denitrification process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106621712A true CN106621712A (en) | 2017-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611220457.9A Pending CN106621712A (en) | 2016-12-26 | 2016-12-26 | Flue gas desulfurization and denitrification process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986033A (en) * | 2005-12-23 | 2007-06-27 | 浙江大学 | Chloric strong oxidant enhanced wet combined urea desulfurizing and denitrifying process |
| CN101274208A (en) * | 2007-12-19 | 2008-10-01 | 华东理工大学 | Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust air |
| CN101306322A (en) * | 2008-02-22 | 2008-11-19 | 北京博奇电力科技有限公司 | Integrative coordinated desulfurization, denitration, demercuration device and technique using spray bubbling method |
| CN101310836A (en) * | 2008-02-25 | 2008-11-26 | 北京博奇电力科技有限公司 | Spray bubbling method all-in-one synergetic desulfurization, denitration, demercuration absorption liquid |
| CN102078761A (en) * | 2010-12-06 | 2011-06-01 | 李鹏举 | Comprehensive flue gas desulfurization, mercury removal and denitration process and device |
| CN203591690U (en) * | 2013-09-29 | 2014-05-14 | 中悦浦利莱环保科技有限公司 | System for removing sulfur, nitrate and mercury in flue gas at same time |
-
2016
- 2016-12-26 CN CN201611220457.9A patent/CN106621712A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986033A (en) * | 2005-12-23 | 2007-06-27 | 浙江大学 | Chloric strong oxidant enhanced wet combined urea desulfurizing and denitrifying process |
| CN101274208A (en) * | 2007-12-19 | 2008-10-01 | 华东理工大学 | Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust air |
| CN101306322A (en) * | 2008-02-22 | 2008-11-19 | 北京博奇电力科技有限公司 | Integrative coordinated desulfurization, denitration, demercuration device and technique using spray bubbling method |
| CN101310836A (en) * | 2008-02-25 | 2008-11-26 | 北京博奇电力科技有限公司 | Spray bubbling method all-in-one synergetic desulfurization, denitration, demercuration absorption liquid |
| CN102078761A (en) * | 2010-12-06 | 2011-06-01 | 李鹏举 | Comprehensive flue gas desulfurization, mercury removal and denitration process and device |
| CN203591690U (en) * | 2013-09-29 | 2014-05-14 | 中悦浦利莱环保科技有限公司 | System for removing sulfur, nitrate and mercury in flue gas at same time |
Non-Patent Citations (1)
| Title |
|---|
| 陶邦彦: "《热电工程与环保》", 31 October 2009, 中国电力出版社 * |
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Application publication date: 20170510 |