CN110075701A - A kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system - Google Patents
A kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system Download PDFInfo
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- CN110075701A CN110075701A CN201810078386.6A CN201810078386A CN110075701A CN 110075701 A CN110075701 A CN 110075701A CN 201810078386 A CN201810078386 A CN 201810078386A CN 110075701 A CN110075701 A CN 110075701A
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- Prior art keywords
- flue gas
- dust removal
- ash
- desulphurization denitration
- desulfurization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system, which includes sequentially connected primary dust-extraction unit, desulfurization and denitrification reaction tower and two-stage dust removal device；Primary dust-extraction unit and two-stage dust removal device are respectively wet cyclome and sack cleaner.Firstly, carrying out primary dedusting to the ash-laden gas generated from boiler combustion stalk；Flue gas after primary dedusting is handled through catalyst converter, and the NO in flue gas is converted into NO2；Flue gas, into desulfurization and denitrification reaction tower, carries out desulphurization denitration purified treatment after catalyst converter is handled；Two-stage dust removal is carried out to the flue gas come out from desulfurization and denitrification reaction tower；Through the filtered gas of two-stage dust removal, chimney is sent into atmosphere qualified discharge by air-introduced machine.Inventive desulfurization denitration is once completed in reaction tower, simplifies system, reduces investment, and denitrification efficiency is high, meets environment protection emission requirement.
Description
Technical field
The present invention relates to stalk direct combustion technical field of power generation more particularly to a kind of dust removal integrated gas cleanings of desulphurization denitration
Technique and system.
Background technique
Stalk direct combustion boiler of power plant generally uses circulating fluidized bed boiler or Water cooling vibration furnace grating boiler at present, whatsoever
Boiler type, flue gas substantially use SNCR(selective non-catalytic reduction in low nitrogen burning+furnace) denitrating technique, using (whirlwind
First dedusting+) circulating fluid-bed desulfurization+bag filter desulfurization dust-removing technique.
The characteristics of stalk direct combustion power-plant flue gas purifies is: 1) stalk fuel sulfur content is low；2) stalk direct combustion power plant emission refers to
Mark is without requiring minimum discharge: a) NOx≤100mg/Nm as coal-burning power plant3, b) and SO2≤100mg/Nm3, c) and dust≤30mg/
Nm3；3) boiler export flue gas data: dust contained flue gas 5g/Nm3, NOx 300mg/Nm3, SO2For 400mg/Nm3(mark condition, wet basis,
6%O2).
In the prior art, flue gas purifying technique has the following disadvantages:
1, due to dual firing chamber's temperature fluctuation in Boiler Furnace, SNCR denitration reaction zone temperature is unstable, it is difficult to which control is in optimum temperature
Section, SNCR denitration low efficiency are difficult to meet discharge index requirement most as low as 35%；
2, SNCR denitrification effect is poor in furnace, and low-temperature SCR (SCR technology) investment is high；
3, before desulfurizer, without first dust collecting process, plant ash can not be recycled, and influence subsequent desulfurization effect；
4, without using desulfurization and denitrification integral technology, desulphurization denitration uses step-by-step setting, and system complex, cost of investment is high, fortune
Row maintenance difficulties are big.
Summary of the invention
The present invention in view of the above shortcomings of the prior art, provides a kind of dust removal integrated flue gas purifying technique of desulphurization denitration
With system, desulphurization denitration is once completed in reaction tower, simplifies system, is reduced investment, and denitrification efficiency is high, is met
Environment protection emission requirement.
To solve problems of the prior art, the specific technical solution of use is:
A kind of dust removal integrated flue gas purifying technique of desulphurization denitration comprising following steps:
S1, primary dedusting is carried out to the ash-laden gas generated from boiler combustion stalk；
Flue gas after S2, primary dedusting is handled through catalyst converter, and the NO in flue gas is converted into NO2 ；
S3, flue gas, into desulfurization and denitrification reaction tower, carry out desulphurization denitration purified treatment after catalyst converter is handled；
S4, two-stage dust removal is carried out to the flue gas come out from desulfurization and denitrification reaction tower；
S5, through the filtered gas of two-stage dust removal, chimney is sent into atmosphere qualified discharge by air-introduced machine.
Preferred scheme, the primary dedusting is using wet cyclome.The two-stage dust removal is using bag
Formula deduster.
Further preferred scheme, the primary dedusting is for separating plant ash, through under wet cyclome separation
Plant ash, by transporting outward plant ash after pneumatic ash conveying plant A input ash cellar A storage.
Scheme still more preferably, the two-stage dust removal is for further clearing up dust, the deashing through sack cleaner
The cigarette ash that ash bucket is fallen into after mechanism effect, by transporting outward lime-ash after pneumatic ash conveying plant B input ash cellar B storage.
Scheme still further preferably, the dust collected through sulphur denitration reaction tower are delivered to ash cellar B storage through screw conveyor
Lime-ash is transported outward after depositing.
The present invention also provides a kind of dust removal integrated flue gas purification systems of desulphurization denitration comprising primary dust-extraction unit,
Desulfurization and denitrification reaction tower and two-stage dust removal device；The entrance of the primary dust-extraction unit is connected with boiler export flue gas, described first
Grade dust-extraction unit outlet be connected through catalyst converter with the entrance of desulfurization and denitrification reaction tower, the outlet of the desulfurization and denitrification reaction tower with
The entrance of two-stage dust removal device is connected, and the two-stage dust removal device outlet is connected with air-introduced machine and chimney.
Wherein, the primary dust-extraction unit and two-stage dust removal device are respectively wet cyclome and sack cleaner.
The lower part of the primary dust-extraction unit and two-stage dust removal device is equipped with pneumatic ash conveying plant and use for collecting conveying dust
In the ash cellar of storage dust.Desulfurization and denitrification reaction tower lower part is successively connected with screw conveyor and ash cellar.
By using above scheme, the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration of the invention is with system and now
There is technology to compare, has the technical effect that
(1), according to the characteristics of flying dust, before desulfurizer, first dust collecting process is equipped with after crop straw burning, recycling grass can be maximized
Wood ash can be used as farmland fertilizer realization and recycle；
(2), desulphurization denitration is once completed in desulfurization and denitrification reaction tower, simplifies system, reduces cost of investment, and system
Operation and maintenance difficulty substantially reduces；
(3), inventive desulfurization denitration efficiency is high, and for desulfuration efficiency up to 80% ~ 90%, denitration efficiency meets environmental protection up to 60% ~ 80%
The requirement of discharge.
Detailed description of the invention
Fig. 1 is a kind of dust removal integrated technological process for flue gas purification figure of desulphurization denitration of the present invention；
Fig. 2 is a kind of system construction drawing of the dust removal integrated flue gas purification system of desulphurization denitration of the present invention.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, below with reference to specific example and referring to attached
Figure, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit of the invention
Range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid the present invention is unnecessarily obscured
Concept.
As shown in Figure 1, a kind of dust removal integrated flue gas purification system of desulphurization denitration comprising sequentially connected Wet type cyclone
Deduster 1, catalyst converter 2, desulfurization and denitrification reaction tower 3 and sack cleaner 4.The entrance and boiler of the wet cyclome 1
Exiting flue gas is connected, and the outlet of the wet cyclome 1 is connected through catalyst converter 2 with the entrance of desulfurization and denitrification reaction tower 3, institute
The outlet for stating desulfurization and denitrification reaction tower 3 is connected with the entrance of sack cleaner 4, the sack cleaner 4 outlet and air-introduced machine 5 and
Chimney 6 is connected.1 lower part of wet cyclome is equipped with pneumatic ash conveying plant A7, and the pneumatic ash conveying plant A7 will be recycled
Plant ash be delivered to ash cellar A8 storage after transport outward.The lower part of the desulfurization and denitrification reaction tower 3 is connected with screw conveyor 9, spiral shell
Rotation conveyer 9 is transported outward after being stored in ash cellar B10 after the dust collected through desulfurization and denitrification reaction tower 3 conveying.The pocket type removes
4 lower part of dirt device is connected with pneumatic ash conveying plant B11, and the dust of collection is delivered to after ash cellar B10 outside by pneumatic ash conveying plant B11
Fortune.
The process flow of the above-mentioned dust removal integrated flue gas purification system of desulphurization denitration are as follows:
The first step carries out primary dedusting to the boiler export flue gas that generates from boiler combustion stalk, primary dedusting using
Wet cyclome 1.The primary dedusting is used to separate plant ash, the plant ash under separating through wet cyclome 1, by
Pneumatic ash conveying plant A7 input ash cellar A8 storage, after plant ash is transported outward；
Second step handles the flue gas after primary dedusting through catalyst converter 2, and after processing, the NO in flue gas is converted into NO2 ；
Third step, flue gas, into desulfurization and denitrification reaction tower 3, carry out desulphurization denitration purified treatment after the processing of catalyst converter 2；Through sulphur
Denitration reaction tower 3 collect dust through the screw conveyor 9 of 3 lower part of desulfurization and denitrification reaction tower be delivered to ash cellar B10 storage, after will
Lime-ash outward transport；
4th step carries out two-stage dust removal to the flue gas come out from desulfurization and denitrification reaction tower 3；Two-stage dust removal is using bag-type dusting
Device 4, two-stage dust removal are equipped with deashing mechanism, the dust removing machine through sack cleaner 4 for further clearing up dust, sack cleaner 4
After structure effect, fall into the cigarette ash of ash bucket by pneumatic ash conveying plant B11 input ash cellar B10 storage, after lime-ash is transported outward；
5th step, through the filtered gas of two-stage dust removal, chimney 6 is sent into atmosphere qualified discharge by air-introduced machine 5.
The foregoing is merely illustrative of the preferred embodiments of the present invention, the protection scope being not intended to limit the invention, it is all
Within the spirit and principles in the present invention, made any modification, is all included in the scope of protection of the present invention equivalent replacement.
Claims (10)
1. a kind of dust removal integrated flue gas purifying technique of desulphurization denitration, which is characterized in that itself the following steps are included:
S1, primary dedusting is carried out to the ash-laden gas generated from boiler combustion stalk；
Flue gas after S2, primary dedusting is handled through catalyst converter, and the NO in flue gas is converted into NO2 ；
S3, flue gas, into desulfurization and denitrification reaction tower, carry out desulphurization denitration purified treatment after catalyst converter is handled；
S4, two-stage dust removal is carried out to the flue gas come out from desulfurization and denitrification reaction tower；
S5, through the filtered gas of two-stage dust removal, Xiang great Qi qualified discharge.
2. the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration according to claim 1, which is characterized in that described first
Grade dedusting is using wet cyclome.
3. the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration according to claim 1, which is characterized in that described two
Grade dedusting is using sack cleaner.
4. the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration according to claim 2, which is characterized in that described first
Grade dedusting is for separating plant ash, through the plant ash under wet cyclome separation, inputs ash cellar A by pneumatic ash conveying plant A
Plant ash is transported outward after storage.
5. the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration according to claim 3, which is characterized in that described two
Grade dedusting falls into the cigarette ash of ash bucket, by pneumatic transporting for further clearing up dust after the effect of the deashing mechanism of sack cleaner
Lime-ash is transported outward after apparatus for ash B input ash cellar B storage.
6. the dust removal integrated flue gas purifying technique of a kind of desulphurization denitration according to claim 5, which is characterized in that de- through sulphur
The dust that nitre reaction tower is collected transports outward lime-ash after screw conveyor is delivered to ash cellar B storage.
7. a kind of dust removal integrated flue gas purification system of desulphurization denitration, which is characterized in that it includes that primary dust-extraction unit, desulfurization are de-
Nitre reaction tower and two-stage dust removal device；The entrance of the primary dust-extraction unit is connected with boiler export flue gas, the primary dedusting
The outlet of device is connected through catalyst converter with the entrance of desulfurization and denitrification reaction tower, and the outlet of the desulfurization and denitrification reaction tower and second level are removed
The entrance of dirt device is connected, and the two-stage dust removal device outlet is connected with air-introduced machine and chimney.
8. the dust removal integrated flue gas purification system of a kind of desulphurization denitration according to claim 7, which is characterized in that described first
The lower part of grade dust-extraction unit and two-stage dust removal device, which is equipped with, conveys the pneumatic ash conveying plant of dust and for storing for collecting
The ash cellar of dust.
9. the dust removal integrated flue gas purification system of a kind of desulphurization denitration according to claim 7, which is characterized in that described first
Grade dust-extraction unit and two-stage dust removal device are respectively wet cyclome and sack cleaner.
10. the dust removal integrated flue gas purification system of a kind of desulphurization denitration according to claim 7, which is characterized in that described
Desulfurization and denitrification reaction tower lower part is successively connected with screw conveyor and ash cellar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810078386.6A CN110075701A (en) | 2018-01-26 | 2018-01-26 | A kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system |
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| CN201810078386.6A CN110075701A (en) | 2018-01-26 | 2018-01-26 | A kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779035A (en) * | 2019-11-01 | 2020-02-11 | 宁波伊布科技有限公司 | Flue gas cyclone dust removal and cooling tower integrated treatment equipment and process thereof |
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| JPH09234333A (en) * | 1996-03-01 | 1997-09-09 | Kawasaki Heavy Ind Ltd | Method for dry treatment of exhaust gas and apparatus therefor |
| CN201239608Y (en) * | 2008-06-27 | 2009-05-20 | 中电投远达环保工程有限公司 | Integrated system for simultaneous desulfuration and denitration using semidry process |
| CN106861350A (en) * | 2017-04-21 | 2017-06-20 | 上海市机电设计研究院有限公司 | The biomass electric power plant gas cleaning handling process and system of dry desulfurization and low-temperature denitration |
| CN107252628A (en) * | 2017-06-30 | 2017-10-17 | 合肥天翔环境工程有限公司 | A kind of flue gas desulfurization denitration dust-removing system |
-
2018
- 2018-01-26 CN CN201810078386.6A patent/CN110075701A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996020038A1 (en) * | 1994-12-23 | 1996-07-04 | ABB Fläkt AB | Method and device for separating gaseous pollutants |
| JPH09234333A (en) * | 1996-03-01 | 1997-09-09 | Kawasaki Heavy Ind Ltd | Method for dry treatment of exhaust gas and apparatus therefor |
| CN201239608Y (en) * | 2008-06-27 | 2009-05-20 | 中电投远达环保工程有限公司 | Integrated system for simultaneous desulfuration and denitration using semidry process |
| CN106861350A (en) * | 2017-04-21 | 2017-06-20 | 上海市机电设计研究院有限公司 | The biomass electric power plant gas cleaning handling process and system of dry desulfurization and low-temperature denitration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779035A (en) * | 2019-11-01 | 2020-02-11 | 宁波伊布科技有限公司 | Flue gas cyclone dust removal and cooling tower integrated treatment equipment and process thereof |
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Application publication date: 20190802 |