CN205850546U - Double alkali double circulation desulphurization absorption systems - Google Patents
Double alkali double circulation desulphurization absorption systems Download PDFInfo
- Publication number
- CN205850546U CN205850546U CN201620459586.2U CN201620459586U CN205850546U CN 205850546 U CN205850546 U CN 205850546U CN 201620459586 U CN201620459586 U CN 201620459586U CN 205850546 U CN205850546 U CN 205850546U
- Authority
- CN
- China
- Prior art keywords
- sodio
- double
- calcium
- desulfurization
- absorbent
- Prior art date
- 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.)
- Active
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
This utility model provides a kind of double alkali double circulation desulphurization absorption system, including: as a tower body of flue gas path；A calcium-based desulfurization absorber portion and a sodio desulfurization absorber portion have been sequentially arranged it along flue gas flow direction in described tower body；By the bicirculating two-grade desulfurizing of double media, improve smoke desulfurization efficiency, and the loop slurry after one-level calcium-base absorbing agent and two grades of sodio absorbent desulfurization is injected regenerated reactor in proportion react, realize regeneration and the recycling of sodio absorbent, generate the by-produced gypsum with economic worth, thus reduce input and operating cost.It addition, install turbulent pipe grid fairing on two grades of serosity collection device tops, play the effect in uniform flow field, improve the gas-liquid mass transfer efficiency of sodio desulfurization absorber portion, increase desulfuration efficiency further.
Description
Technical field
This utility model relates to environmental technology field, particularly relates to flue gas desulfurization technique, is specifically related to a kind of double alkali pair and follows
Ring desulfurizing adsorption system.
Background technology
" coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) " requires eastern region (Liaoning, Beijing, sky
11 provinces and cities such as Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan) newly-built Thermal generation unit atmosphere pollution
Concentration of emission basically reach gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, nitrogen oxygen
Compound concentration of emission is respectively no higher than 10,35,50 milligrams/cubic metre), middle part (Heilungkiang, Jilin, Shanxi, Anhui, lake
8 provinces such as north, Hunan, Henan, Jiangxi) new-built unit is in principle close to or up gas turbine group emission limit, with encouraging western part
District's new-built unit is close to or up gas turbine group emission limit.To the year two thousand twenty, eastern region active service 300,000 kilowatts and above public affairs
With Thermal generation unit, 100,000 kilowatts and above provide Thermal generation unit and other Thermal generation unit with good conditionsi for oneself, change
Make rear Air Pollutant Emission concentration and basically reach gas turbine group emission limit.In view of Coal Combustion in China quality, to all of combustion
The flue gas that coal-fired plant produces is required for carrying out desulfurization process, and makes the sulfur dioxide in flue gas content of discharge meet above-mentioned correlative link
Guaranteed request.
For the problem that China's major part region fire coal sulfur-bearing is too high, traditional single cycle desulfurization technology is extremely difficult to country
The new standard-required of Chinese Ministry of Environmental Protection.Use single cycle desulfurization technology, apply wet limestone-gypsum FGD technique, only pass through Calx
Stone serosity and coal-fired flue-gas are fully contacted desulfurization, even if under preferable operating mode, desulfuration efficiency is the highest also can only achieve 98%, for
Content of sulfur dioxide is higher than 2000mg/Nm3Coal-fired flue-gas, use above-mentioned technology and technique to be difficult to qualified discharge,
So it is accomplished by increasing extra processing means or equipment, improves and run and maintenance cost, and environmental protection equipment can be increased account for
Ground, affects the integral layout of coal-burning power plant.
In order to improve desulfuration efficiency, those skilled in the art have started to attempt the desulphurization system that research and development are new, and Chinese invention is special
Profit application (application number 201510034481.2), is disclosed a kind of double circulation desulphurization system, is each followed by two stage cycle serosity
Ring desulfurization, removes the sulfur dioxide in flue gas.But the technical scheme of this patent application needs constantly to put into sodio to be taken off
Sulfur absorbing agent, it is impossible to realize the regeneration of sodio desulfurization absorbent, therefore not only result in the significant wastage of operating cost, and whole
Ion concentration of receiving in individual serum recycle improves constantly also can affect gypsum slurries generation, and then reduces desulfuration efficiency, and it is being implemented
The limitation that upper existence is bigger.
Additionally, the uniform degree in the flue gas of this patent application flow field after gas-liquid separation device can decline to a great extent, can reduce
Desulfuration efficiency in the second circulation desulfurization region.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of double alkali double circulation desulphurization absorption system, by double
The bicirculating two-grade desulfurizing of medium, improves smoke desulfurization efficiency, and by one-level calcium-base absorbing agent and two grades of sodio absorbent desulfurization
After loop slurry inject regenerated reactor in proportion and react, it is achieved the regeneration of sodio absorbent and recycling, generation has
The by-produced gypsum of economic worth, thus reduce input and operating cost.It addition, install rapids on two grades of serosity collection device tops
Flow tube grid fairing, plays the effect in uniform flow field, improves the gas-liquid mass transfer efficiency of sodio desulfurization absorber portion, increases de-further
Sulphur efficiency.
For reaching above-mentioned purpose, the concrete technical scheme that this utility model is taked is:
A kind of double alkali double circulation desulphurization absorption system, including:
A tower body as flue gas path；
A calcium-based desulfurization absorber portion and a sodio desulfurization absorber portion have been sequentially arranged it along flue gas flow direction in described tower body；
Described sodio desulfurization absorber portion includes: some two grades of spraying layers, is positioned at the serosity below described two grades of spraying layers
Collection device, the fairing between described two grades of spraying layers and described serosity collection device, and it is communicated in described two
A sodio absorbent pond between level spraying layer and described serosity collection device；
Described calcium-based desulfurization absorber portion includes: connection is positioned at some one-levels spray in the calcium-based slurries pond bottom described absorption tower
Drench layer；
Described sodio absorbent pond and calcium-based slurries pond connect a regenerating unit simultaneously；
One regeneration serum outlet of described regenerating unit is communicated to the overhead stream in described sodio absorbent pond.
Further, described oxidation accelerator injection apparatus includes being arranged on the sidewall of described gas approach uniform many
Individual nozzle.
Further, fairing is selected from deflector, perforated trays, flow straightening grid or rectifier tube row.
Further, arranging multiple projection bottom described serosity collection device, the top of described projection or sidepiece have logical
Pore.
Further, it is tapered bottom described serosity collection device.
A kind of double alkali double circulation desulphurization absorption process, comprises the following steps:
1) calcium-base absorbing agent after coal-fired flue-gas enters a flue gas path and is atomized inversely contacts and carries out first grade desulfurizing, obtains
Once desulfurization flue gas；Calcium-base absorbing agent recycles；
2) flow field of once desulfurization flue gas is carried out rectification so that it is flow field uniform after be atomized after sodio absorbent reverse
Contact carries out two-grade desulfurizing, obtains secondary desulfuration flue gas；Sodio absorbent recycles；
3) when the pH value of calcium-base absorbing agent and sodio absorbent is less than a threshold values, the two injects a regeneration dress in proportion
Put；
4) the regeneration sodio serosity that regenerating unit produces supplements sodio absorbent.
Further, step 1) described in calcium-base absorbing agent pH value be 4.5-5.2.
Further, step 1) described in calcium-base absorbing agent be aqua calcis or lime stone slurry.
Further, step 2) described in sodio absorbent selected from sodium carbonate or sodium hydroxide.
Further, step 4) in the injection ratio of sodio absorbent and calcium-base absorbing agent ensure Na ion concentration and calcium from
Sub-concentration ratio is 2:1.
Sulfur-containing smoke gas is entered in absorption tower by absorption tower entrance, sequentially passes through tradition calcium-based desulfurization absorber portion, turbulent pipe grid
Fairing, sodio desulfurization absorber portion and flue gas demister, discharge eventually through absorption tower outlet.Circulation after two-step desulfurization
Absorbing liquid is squeezed into regenerating unit in proportion and is carried out the regeneration of sodio absorbent, and the absorbent after regeneration can be recycled, after regeneration
Residue serosity squeeze into again oxidation pond produce Gypsum Fibrosum.
This device has the advantage that desulfuration efficiency is high, owing to have employed two kinds of different absorbing mediuies, can be effectively improved
Desulfuration efficiency, reduces liquid-gas ratio, and the renewable recycling of sodio absorbent, reduces operating cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of double alkali double circulation desulphurization absorption systems in this utility model one embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clear, complete description, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole realities
Execute example.Based on the embodiment in this utility model, those of ordinary skill in the art are institute under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.Coordinate institute's accompanying drawing to of the present utility model below
Feature and advantage elaborate.
As it is shown in figure 1, the double alkali double circulation desulphurization absorption systems provided in one embodiment, including:
Tower body 1 as flue gas path；
Calcium-based desulfurization absorber portion 2 and sodio desulfurization absorber portion 3 have been sequentially arranged it along flue gas flow direction in tower body 1；
Sodio desulfurization absorber portion 3 includes: some two grades of spraying layers 7, is positioned at the serosity collection device below two grades of spraying layers 7
5, the turbulent pipe grid fairing between two grades of spraying layers 7 and serosity collection device 5, and it is communicated in two grades of spraying layers 7 and 5
Sodio absorbent pond 8 between serosity collection device；
Calcium-based desulfurization absorber portion 2 includes: connection is positioned at some one-level spraying layers 6 in the calcium-based slurries pond 4 bottom absorption tower；
Sodio absorbent pond 8 and calcium-based slurries pond 4 connect regenerating unit 9 simultaneously；
The regeneration serosity outlet of regenerating unit 9 is to the overhead stream in sodio absorbent pond 8.
In other embodiments, fairing is further selected from the tool of other structures such as deflector, perforated trays, flow straightening grid
There is the structure of water conservancy diversion, flow equalizing function.
In other embodiments, multiple protruding (not shown), protruding top or sidepiece are set bottom serosity collection device
Having passage, flue gas can pass through vent flow.
In other embodiment, it is tapered bottom serosity collection device, the beneficially collection of serosity.
Double alkali double circulation desulphurization absorption process based on said system, comprises the following steps:
1) calcium-base absorbing agent after coal-fired flue-gas enters a flue gas path and is atomized inversely contacts and carries out first grade desulfurizing, obtains
Once desulfurization flue gas；Calcium-base absorbing agent recycles；
2) flow field of once desulfurization flue gas is carried out rectification so that it is flow field uniform after be atomized after sodio absorbent reverse
Contact carries out two-grade desulfurizing, obtains secondary desulfuration flue gas；Sodio absorbent recycles；
3) when the pH value of calcium-base absorbing agent and sodio absorbent is less than a threshold values, the two injects a regeneration dress in proportion
Put；
4) the regeneration sodio serosity that regenerating unit produces supplements sodio absorbent.
Wherein, step 1) described in calcium-base absorbing agent pH value be 4.5-5.2；Step 1) described in calcium-base absorbing agent be hydrogen-oxygen
Change calcium solution or lime stone slurry；Step 2) described in sodio absorbent selected from sodium carbonate or sodium hydroxide；Step 4) in sodio
With the injection ratio of calcium-base absorbing agent, absorbent ensures that Na ion concentration and calcium ion concentration ratio are 2:1.
The former flue gas of sulfur-bearing enters absorption tower through entrance, sequentially passes through calcium-based desulfurization absorber portion, sodio desulfurization absorber portion, flue gas
Demister, is finally discharged by outlet.Main operational principle is:
The most former flue gas is carried out absorption tower by entrance, first with atomization after calcium-base absorbing agent (such as calcium hydroxide or limestone
Serosity) reverse contact carries out desulfurization, and calcium-base absorbing agent pH value adjusts between 4.5-5.2, and desulfurization rear slurry falls after rise to tower prime cement
Pond, recycling.When calcium-base absorbing agent pH is less than 4.5, serosity is squeezed into regenerated reactor, and refills fresh slurry.One
Level loop slurry acts primarily as the effect of pre-washing, and lower ph can ensure that being completely dissolved of absorbent, and obtains more preferable Gypsum Fibrosum
Quality.In conventional single column single cycle absorption technique, pH is typically between 5.2-5.5, on the basis ensureing certain desulfuration efficiency
On be easy to oxidation and dehydration, but usually face that oxidation is unfavorable or awkward situation that desulfuration efficiency is relatively low.
2. flue gas is after first order absorption agent desulfurization, passes upward through two grades of serosity collection devices, and whole through turbulent pipe grid device
After stream, inversely contacting with the sodio absorbent after atomization and carry out desulfurization, the serosity collection after desulfurization recycles to the outer stock tank of tower.
Sodio absorbent can be sodium carbonate or sodium hydroxide, and as used sodium carbonate, then effecting reaction pH is between 4.4-7.6, is less than
When 4.4, serosity is squeezed into regenerated reactor, and injects fresh slurry in the outer stock tank of tower；As used sodium hydroxide then effecting reaction pH model
Being trapped among between 10-12, regenerated reactor outlet slurry pH value is relatively beneficial to absorb reaction and is smoothed out when about 7.
Whole sodio absorbent all injects regenerated reactor, and sodio absorbent ensures sodium with the injection ratio of calcium-base absorbing agent
Ion concentration and calcium ion concentration ratio are about 2:1.After being sufficiently stirred for reaction completely, the sodio absorbent that top is regenerated
Clear liquid is injected back into the outer stock tank of tower, and lower slurry is squeezed into oxidation pond and blasted oxidation air, and after cyclone and vacuum belt dewaterer
Make by-produced gypsum.
The double medium two stage cycle desulphurization systems that the utility model proposes have the ability that regeneration of absorption solution recycles, and
Between two-stage absorption region, install turbulent pipe grid fairing additional play airflow uniform distribution effect, in the premise reaching equal removal effect
Under, can effectively reduce liquid-gas ratio, and reduce operating cost.
As a example by a practical sulphur removal system, using sodium carbonate as sodio absorbent, lime stone slurry as calcium-base absorbing agent,
Sodium hydroxide is as sodio absorbent, and raw flue gas content of sulfur dioxide before entering absorption tower is 4000mg/Nm3, warp respectively
After crossing one-level, two-grade desulfurizing, the content of sulfur dioxide in flue gas is reduced to 35mg/Nm3, meet discharge standard.Wherein, due to sodium
Base absorbant can be constantly regenerating, and calcium-base absorbing agent may be used for making Gypsum Fibrosum after desulfurization, and fume treatment can be greatly lowered
Cost.
Comparative example 1:
The above-mentioned desulphurization system of same employing, removes current equalizer, owing to serosity collection device is placed in first grade desulfurizing and two
Between level desulfurization, it is that flue gas is mainly concentrated along tower wall, it is impossible to realize uniform, cause two-grade desulfurizing effect unsatisfactory, same
Content of sulfur dioxide is 4000mg/Nm3Flue gas, after being processed by this comparative example, content of sulfur dioxide in flue gas fall
As little as ... 50mg/Nm3, it is impossible to realize qualified discharge.
As a example by another practical sulphur removal system, using sodium hydroxide as sodio absorbent, calcium hydroxide slurry is as calcio
Absorbent, sodium carbonate is as sodio absorbent, and raw flue gas content of sulfur dioxide before entering absorption tower is 4000mg/Nm3, point
Not after one-level, two-grade desulfurizing, the content of sulfur dioxide in flue gas is reduced to 35mg/Nm3, meet discharge standard.Wherein, by
Can be constantly regenerating in sodio absorbent, calcium-base absorbing agent may be used for making Gypsum Fibrosum after desulfurization, and flue gas can be greatly lowered
Processing cost.
Claims (5)
1. a double alkali double circulation desulphurization absorption system, it is characterised in that including:
A tower body as flue gas path；
A calcium-based desulfurization absorber portion and a sodio desulfurization absorber portion have been sequentially arranged it along flue gas flow direction in described tower body；
Described sodio desulfurization absorber portion includes: some two grades of spraying layers, is positioned at the serosity below described two grades of spraying layers and collects
Device, the fairing between described two grades of spraying layers and described serosity collection device, it is communicated in described two grades of sprays
A sodio absorbent pond between layer and described serosity collection device；
Described calcium-based desulfurization absorber portion includes: connection is positioned at some one-level spraying layers in the calcium-based slurries pond bottom described tower body；
Described sodio absorbent pond and calcium-based slurries pond connect a regenerating unit simultaneously；
One regeneration serum outlet of described regenerating unit is communicated to the overhead stream in described sodio absorbent pond.
2. double alkali double circulation desulphurization absorption system as claimed in claim 1, it is characterised in that described one-level spraying layer and two grades
The quantity of spraying layer is all less than three layers.
3. alkali double circulation desulphurization absorption systems as claimed in claim 1 double, it is characterised in that fairing selected from deflector,
Perforated trays, flow straightening grid or rectifier tube row.
4. double alkali double circulation desulphurization absorption system as claimed in claim 1, it is characterised in that bottom described serosity collection device
Arranging multiple projection, top or the sidepiece of described projection have passage.
5. double alkali double circulation desulphurization absorption system as claimed in claim 1, it is characterised in that bottom described serosity collection device
For tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620459586.2U CN205850546U (en) | 2016-05-19 | 2016-05-19 | Double alkali double circulation desulphurization absorption systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620459586.2U CN205850546U (en) | 2016-05-19 | 2016-05-19 | Double alkali double circulation desulphurization absorption systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205850546U true CN205850546U (en) | 2017-01-04 |
Family
ID=57642634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620459586.2U Active CN205850546U (en) | 2016-05-19 | 2016-05-19 | Double alkali double circulation desulphurization absorption systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205850546U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854551A (en) * | 2016-05-19 | 2016-08-17 | 大唐环境产业集团股份有限公司 | Double-alkali double-circulation desulfurization absorption system and method |
| CN112156637A (en) * | 2020-09-02 | 2021-01-01 | 司燕 | Composite causticization scale-free double-alkali process and system |
-
2016
- 2016-05-19 CN CN201620459586.2U patent/CN205850546U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854551A (en) * | 2016-05-19 | 2016-08-17 | 大唐环境产业集团股份有限公司 | Double-alkali double-circulation desulfurization absorption system and method |
| CN112156637A (en) * | 2020-09-02 | 2021-01-01 | 司燕 | Composite causticization scale-free double-alkali process and system |
| CN112156637B (en) * | 2020-09-02 | 2022-08-19 | 司燕 | Composite causticization scale-free double-alkali process and system for desulfurization or decarburization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105854551A (en) | Double-alkali double-circulation desulfurization absorption system and method | |
| CN101934192B (en) | Double-tower ammonia-method desulfurization process | |
| CN204522737U (en) | A kind of mixed-flow wet process of FGD dedusting near-zero release integration absorption tower | |
| CN205127723U (en) | High -efficient doublestage subregion sprays desulfurizing tower | |
| CN105879621A (en) | Two-section type dual-circulation desulfurization and denitrification device and method for realizing near zero emission | |
| CN103768908B (en) | What a kind of wet type integrated desulfurizing denitration demercuration took off PM2.5 removes tower and technique | |
| CN205672756U (en) | A kind of double tower Two-way Cycle lime stone gypsum wet flue gas desulfurizing device | |
| CN104524935A (en) | Single-tower type double-circulation sprinkling composite absorption device and method | |
| CN204637975U (en) | Flue gas desulfurization enhancing device | |
| CN205850546U (en) | Double alkali double circulation desulphurization absorption systems | |
| CN205796897U (en) | Two-way Cycle reducing desulfurizing adsorption system | |
| CN205850545U (en) | Double alkali Two-way Cycle coordinated desulfurization denitrating systems | |
| CN204325296U (en) | A kind of gas desulfurizer | |
| CN204247052U (en) | Single tower type double-cycle spray composite absorption device | |
| CN105879588A (en) | Double-circulation diameter-variable desulfurization and absorption system and method | |
| CN107243248A (en) | A kind of folded plate type gas-liquid part flow arrangement | |
| CN205216581U (en) | Can realize device of flue gas desulfurization denitration simultaneously | |
| CN104190228B (en) | A kind of composite efficient energy-saving ammonia process desulfuration tower | |
| CN204134462U (en) | A kind of ammonia process deep oxidation desulfurization tower | |
| CN203469804U (en) | Absorption tower device capable of simultaneously desulfurizing and denitrifying smoke | |
| CN205127726U (en) | Double tower is two -way to spray multicycle desulfurization absorption tower | |
| CN107335332A (en) | A kind of fold-line-shaped gas-liquid part flow arrangement with collecting tank | |
| CN105879623A (en) | Dual-alkali and dual-circulation collaborative desulfurization and denitrification system and method | |
| CN204193768U (en) | A kind of composite efficient energy-saving ammonia process desulfuration tower | |
| CN207153466U (en) | A kind of fold-line-shaped gas-liquid part flow arrangement with collecting tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |