CN206853455U - Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG systems based on SDA methods - Google Patents
Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG systems based on SDA methods Download PDFInfo
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- CN206853455U CN206853455U CN201720782865.7U CN201720782865U CN206853455U CN 206853455 U CN206853455 U CN 206853455U CN 201720782865 U CN201720782865 U CN 201720782865U CN 206853455 U CN206853455 U CN 206853455U
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Abstract
The utility model discloses the coke oven flue gas sodium calcium base combined desulfurization dedusting SDG systems based on SDA methods, desulfurization ash silo and white lime storehouse are connected with desulfurizer regeneration tank respectively, desulfurizer regeneration tank is connected with cyclone again, the second outlet underflow of cyclone is connected with gypsum retracting device, the first outlet of cyclone is upper to be connected with desulfurizing agent feed tank, desulfurizing agent feed tank is also connected with soda powder cabin and rotating spraying desulfurizing tower respectively, rotating spraying desulfurizing tower is also connected with defeated ash silo pump and chimney respectively, defeated ash silo pump is also connected with described desulfurization ash silo, Desulphurization is returned to desulfurizer regeneration tank and reacted with white lime by defeated ash silo pump, to reclaim gypsum and recycling desulfurizer, soda is added by soda powder cabin in real time simultaneously, adjust the pH and supplement sodium base of desulfurizer slurry.The utility model improves flue-gas temperature as far as possible, with white lime recycling desulfurizer, realizes the circulation of sodium base, reduces soda usage amount, reduces desulfurizing agent use cost, and Desulphurization realizes recycling.
Description
Technical field
The utility model belongs to cock-oven gas purifying technical field, more particularly to a kind of to be based on SDA (Spray Drying
Absorption, spray dry absorbingatreatingastep desulfurization) method the new Sodium/Calcium base combined desulfurization dedusting SDG systems (Spray of coke oven flue gas
Drying Gypsum, rotary spraying and drying desulfurization transformation of ownership gypsum) and its desulfurization and dedusting method.
Background technology
Coking industry is air SO2And NOxOne of pollutant primary discharge industry, its influence to environment is gradually by height
Degree is paid attention to, therefore, country promulgated in 2012 and requires to come into effect on October 1st, 2012《Coking chemistry industrial pollutants
Discharge standard》(GB16171-2012), to SO2Realization is kept under strict control, and to existing enterprise, newly-built enterprise and " needs to take especially
The enterprise in the area of safeguard measure " has respectively provided emission limit, but with regard to current coke oven technique and using coke-stove gas heating
For technology, it can not all meet this New emission standard requirement, therefore, coke oven flue gas desulfurization becomes must matching somebody with somebody for coking industry.
Coke oven flue gas desulfurization ground zero, mainly use for reference electric power, sintering industry flue gas desulfurization technique.At present, sulfur removal technology road
Line has several big types such as dry method, semidry method and wet method.The existing multiple flue gas desulfurization and denitrification devices of coke oven industry are gone into operation, wherein desulfurization
Technique has multiple achievements using SDA's.These devices provide the bars such as preferable flue-gas temperature to follow-up coke oven flue gas removing NOx
Part, flue-gas temperature fall caused by reducing desulfurization as far as possible, improve the flue-gas temperature after desulfurization, the SDA devices gone into operation
Using soda as desulfurizing agent, work well, can reach at present in practical application achievement《Coking chemistry emission of industrial pollutants
Standard》The requirement of (GB16171-2012) table 6, but the Desulphurization main component after desulfurization is Na2SO3、Na2SO4And Na2CO3
Deng mixture；On the one hand, for soda as desulfurizing agent, about 1700-2000 yuan/ton of unit price, desulfurizing agent use cost is higher, accounts for total
The 10%-20% of operating cost；On the other hand, the Desulphurization after desulfurization is due to complicated component, and unstable, Desulphurization is actual comprehensive
Using there is limitation.Therefore, in order to further improve SDA sulfur removal technologies, the technique need to be optimized, carry mark, reduce operation
Cost, while the accessory substance of desulfurization is realized comprehensive utilization of resources.
The content of the invention
A purpose of the present utility model is to provide a kind of coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG based on SDA methods
System.
Another object of the present utility model be to provide it is a kind of utilize it is above-mentioned based on SDA methods coke oven flue gas Sodium/Calcium base joint
The method that desulfurization and dedusting SDG systems carry out desulfurization and dedusting.
The technical solution of the utility model is as follows：
A kind of coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems based on SDA methods, including desulfurization ash silo, white lime
Storehouse, desulfurizer regeneration tank, cyclone, soda powder cabin, desulfurizing agent feed tank, rotating spraying desulfurizing tower, defeated ash silo pump and chimney；
Described desulfurization ash silo and described white lime storehouse are connected with described desulfurizer regeneration tank respectively, described desulfurization
Agent regenerating tank is connected with described cyclone again, wherein, second outlet underflow and the gypsum retracting device of described cyclone connect
Connect, the first outlet of described cyclone is upper to be connected with described desulfurizing agent feed tank, and described desulfurizing agent feed tank also divides
Be not connected with described soda powder cabin and described rotating spraying desulfurizing tower, described rotating spraying desulfurizing tower also respectively with it is described
Defeated ash silo pump connected with described chimney, described defeated ash silo pump is also connected with described desulfurization ash silo；
Desulphurization is returned to described desulfurizer regeneration tank and reacted with white lime by described defeated ash silo pump, to reclaim gypsum
And recycling desulfurizer, while soda is added by described soda powder cabin in real time, adjust the pH and supplement sodium base of desulfurizer slurry.
Preferably, the top of described rotating spraying desulfurizing tower is provided with atomizer and top tank, described top tank with it is described
Desulfurizing agent feed tank connects, and flue gas enters described rotating spraying desulfurizing tower in described mist through coke oven turning plate valve leading portion flue
Change device and desulfurizer slurry reaction desulfuration.
Preferably, the bottom of described rotating spraying desulfurizing tower is provided with sack cleaner, described sack cleaner difference
It is connected with described defeated ash silo pump and described chimney, draws between described sack cleaner and described chimney provided with flue gas
Grey machine, described defeated ash silo pump are located at the bottom of described sack cleaner.
Preferably, flue gas cold blast sliding valve is provided between described rotating spraying desulfurizing tower and described sack cleaner；Institute
Hand operated gate valve is provided between the sack cleaner and described defeated ash silo pump stated.
Preferably, described gypsum retracting device is gypsum dehydration machine.
Preferably, described desulfurizer regeneration tank is provided with oxidation fan.
The utility model, which is also disclosed, a kind of utilizes the above-mentioned coke oven flue gas Sodium/Calcium base combined desulfurization dedusting based on SDA methods
The method that SDG systems carry out desulfurization and dedusting, comprises the following steps：
(1) flue gas enters described rotating spraying desulfurizing tower in described atomizer through coke oven turning plate valve leading portion flue
In, desulphurization reaction is carried out with the desulfurizer slurry that described desulfurizing agent feed tank provides, after desulfurization, from chimney after flue gas removing dust
Discharge, Desulphurization pass through described defeated ash silo and are pumped to described desulfurization ash silo again；
(2) Desulphurization reacts with white lime in described desulfurizer regeneration tank, system pH=5~6, and blasts air, passes through
After described spinning liquid solid-liquid separation, flow out from second outlet underflow, and collected after entering described gypsum retracting device dehydration
Gypsum, and flowed out from described from first outlet is upper, into described desulfurizing agent feed tank；
(3) the desulfurizing agent feed tank described in is additionally added soda ash, system pH=9~12, recycling desulfurizer, then by desulfurization
Agent slurries deliver to described atomizer and carry out desulphurization reaction, so as to form Sodium/Calcium base combined desulfurization dedusting SDG circulation technologies.
Wherein, the desulphurization reaction process occurred in described rotating spraying desulfurizing tower is：
2NaOH+SO2→Na2SO3+H2O
Na2CO3+SO2→Na2SO3+CO2
2Na2SO3+O2→2Na2SO4
Desulfurizer slurry is by Desulphurization, white lime, a small amount of dilute sulfuric acid and Na2CO3Regeneration is prepared, wherein, white lime is used
In removal SO4 2-, dilute sulfuric acid is for adjusting desulfurizer regeneration tank pH value, Na2CO3For supplementing sodium base and adjustment desulfurizing agent charging-tank
PH value, desulfurizer regeneration tank course of reaction are as follows：
Na2SO4+Ca(OH)2+2H2O→CaSO4·2H2O↓+2NaOH
Na2SO3+Ca(OH)2+O2+2H2O→CaSO4·2H2O↓+2NaOH
Na2CO3+Ca(OH)2→CaCO3↓+2NaOH
PH value adjustment is carried out using dilute sulfuric acid between desulfurizer regeneration tank and cyclone, course of reaction is as follows：
H2SO4+Na2CO3→Na2SO4+H2O+CO2↑
H2SO4+Ca(OH)2→CaSO4·2H2O↓
Preferably, it is 40-55% from the concentration of the liquid of second outlet underflow outflow.
Preferably, it is 5-15% from the concentration of the liquid of first outlet underflow outflow.
Preferably, the concentration of the solidliquid mixture of described desulfurizer regeneration tank is 10~30%, density 1.05-
1.2kg/m3, and pass through dilute sulfuric acid regulation system pH=5~6.
Compared with prior art, the beneficial effects of the utility model are as follows：
A kind of coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems based on SDA methods of the present utility model, pass through profit
It can greatly reduce soda only as the supplement being lost in cyclic process by the use of white lime as desulfurizer regeneration agent, the addition of soda
Consumption, reduce desulfurizing agent operating cost；It is NaOH that it is actual, which to obtain desulfurizing agent, for regeneration simultaneously, and NaOH reactivity is much stronger than Soviet Union
Beat, therefore, the more former soda of desulfurized effect is directly as the better of desulfurizing agent；In addition, Desulphurization passes through desulfurizer regeneration mistake
Journey, gypsum is converted into, gypsum can be used widely as building materials, and it is comprehensive to solve former soda SDA techniques Desulphurization recycling
Close the problem of utilizing.
Certainly, implement any product of the present utility model to it is not absolutely required to reach all the above advantage simultaneously.
Brief description of the drawings
Fig. 1 is a kind of coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems based on SDA methods of the present utility model
Structural representation.
Embodiment
With reference to specific embodiment, the utility model is expanded on further.It should be understood that these embodiments are merely to illustrate
The utility model, rather than limit the scope of protection of the utility model.Those skilled in the art are according to this in actual applications
The modifications and adaptations that utility model is made, still fall within the scope of protection of the utility model.
In order to better illustrate the utility model, the utility model is described in detail below with accompanying drawing.
A kind of as shown in figure 1, coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems based on SDA methods of the present utility model
System, including desulfurization ash silo 1, white lime storehouse 2, desulfurizer regeneration tank 3, cyclone 5, soda powder cabin 6, desulfurizing agent feed tank 7, rotation
FGD by spraying mist tower 12, defeated ash silo pump 16 and chimney 18；
Described desulfurization ash silo 1 and described white lime storehouse 2 are connected with described desulfurizer regeneration tank 3 respectively, Desulphurization
Calcium sulfite is turned in the hybrid reaction of desulfurizer regeneration tank 3, generation calcium sulfate and calcium sulfite, while in order to realize with white lime
Calcium sulfate is turned to, described desulfurizer regeneration tank 3 is additionally provided with oxidation fan 4 to blast oxygen, and described desulfurizer regeneration tank 3 is also
It is connected again with described cyclone 5, for standing separation solidliquid mixture, wherein, the second outlet underflow of described cyclone 5
It is connected with gypsum retracting device 9, the concentration of this layer of efflux is larger, and run-of-the-mill fraction is 40~55%, reclaims and fills through gypsum
9 dehydrations are put, the relatively low gypsum of moisture content is made；The upper and described desulfurizing agent feed tank 7 of the first outlet of described cyclone 5
Connection, the solution containing sodium hydroxide and other matter is passed through in desulfurizing agent feed tank 7；
Described desulfurizing agent feed tank 7 is connected with described soda powder cabin 6 and described rotating spraying desulfurizing tower 12 respectively,
Described soda powder cabin 6 is used to add sodium base and adjusts the pH of desulfurizer slurry, and described rotating spraying desulfurizing tower 12 is used to send out
Raw desulphurization reaction, described rotating spraying desulfurizing tower 12 are also connected with described defeated ash silo pump 16 and described chimney 18 respectively,
Flue gas after desulfurization and dedusting is discharged through chimney 18, and described defeated ash silo pump also 16 is connected with described desulfurization ash silo 1, and composition is answered
Miscellaneous Desulphurization is delivered in desulfurization ash silo 1；
Described defeated ash silo pump 16 is returned to Desulphurization in described desulfurizer regeneration tank 3 and white lime by the utility model
Reaction, to reclaim gypsum and recycling desulfurizer, while soda, regulation desulfurizing agent slurry are added by described soda powder cabin 6 in real time
The pH and supplement sodium base of liquid, realize that Sodium/Calcium base combined desulfurization dedusting SDG is circulated.
Wherein, described gypsum retracting device 9 is gypsum dehydration machine, and the gypsum that dehydration rate is less than 10% can be made.
In addition, the top of described rotating spraying desulfurizing tower 12 be provided with atomizer 11 and top tank 10, described top tank 10 with
Described desulfurizing agent feed tank 7 connects, and desulfurizer slurry flows into top tank 10 through thresing machine supply pump 8, and flue gas is through coke oven flap valve
Section flue (not marked in figure) enters described rotating spraying desulfurizing tower 12 in described atomizer 11 and desulfurizer slurry in front of the door
Reaction desulfuration.
The bottom of described rotating spraying desulfurizing tower 12 is provided with sack cleaner 14, and the speed that flue gas passes through filter bag is 0.7-
1.1m/s, dust are attached to filter bag surface, carry out two step desulphurization reactions while dedusting, reach the effect of desulfurization, dedusting, handle
Flue gas afterwards discharges through chimney 18；Further, the sack cleaner 14 described in the present embodiment respectively with described defeated ash silo pump
16 and described chimney 18 connect, draw grey machine 17 provided with flue gas between described sack cleaner 14 and described chimney 18,
Described defeated ash silo pump 16 is located at the bottom of described sack cleaner 14.
Flue gas cold blast sliding valve 13 is provided between described rotating spraying desulfurizing tower 12 and described sack cleaner 14, is used for
Former flue-gas temperature fluctuation is adjusted, protects sack cleaner；Set between described sack cleaner 14 and described defeated ash silo pump 16
There are hand operated gate valve 15, for completely cutting off, easy access.
The utility model, which is also disclosed, a kind of utilizes the above-mentioned coke oven flue gas Sodium/Calcium base combined desulfurization dedusting based on SDA methods
The method that SDG systems carry out desulfurization and dedusting, comprises the following steps：
(1) flue gas enters described rotating spraying desulfurizing tower in described atomizer through coke oven turning plate valve leading portion flue
In, the desulfurizer slurry mass concentration 10-30%NaOH provided with described desulfurizing agent feed tank solution carries out desulphurization reaction,
Accessory substance is synchronously dried, and is discharged after flue gas removing dust from chimney, and Desulphurization passes through described defeated ash silo and is pumped to described desulfurization again
Ash silo；
(2) Desulphurization reacts with white lime in described desulfurizer regeneration tank, and blasts air, while desulfurizer regeneration tank
The concentration control of solidliquid mixture is 10~30%, density 1.05-1.2kg/m3, and pass through dilute sulfuric acid regulation system pH=5
~6, after described spinning liquid solid-liquid separation, flowed out from second outlet underflow, the concentration of liquid is 40-55%, and enters institute
Gypsum is collected after the gypsum retracting device dehydration stated, and is flowed out from described from first outlet is upper, the concentration of liquid is 5-
15% enters described desulfurizing agent feed tank；
(3) the desulfurizing agent feed tank described in is additionally added soda ash, regulation system pH=9~12, recycling desulfurizer, then will
Desulfurizer slurry delivers to described atomizer and carries out desulphurization reaction, so as to form Sodium/Calcium base combined desulfurization dedusting SDG circulation industrials
Skill.
In order to ensure the mature and reliable of SDG techniques, the utility model be it is a kind of based on SDA methods with it is united with Sodium/Calcium base
Technique, realizes to provide for follow-up removing NOx while flue gas high-efficiency desulfurization and improves flue-gas temperature as far as possible, with white lime again
Raw desulfurizing agent, realizes the circulation of sodium base, reduces the direct usage amount of soda, reduces desulfurizing agent use cost, and Desulphurization is realized
The composite technology of recycling.
In order to ensure with higher desulfuration efficiency, rotary-atomizing described in the utility model dries that desulfurization is actual to use NaOH
Solution carries out desulfurization, and desulfuration efficiency is better than existing sodium base SDA desulfurization technologies.
In order to reduce the consumption of sodium base desulfurizer and reduce operating cost, the utility model is using white lime as desulfurizing agent
Regenerative agent, the unit price of white lime is only 300-500 yuan/ton, by the Na in Desulphurization2SO3And Na2SO4NaOH is replaced into, is realized
The recycling of sodium.
In order to realize the comprehensive utilization of resources of Desulphurization, the utility model is reacted using white lime and Desulphurization, production
CaSO4And CaSO3, by blasting air, realize and force oxidation generation gypsum, realization is made a silk purse out of a sow's ear, recycling.
Finally, the utility model has desulfurization, a dedusting function simultaneously, efficiency high, can be stable, effective removal coke oven cigarette
SO in gas2And dust, because sodium carbonate activity is high, under the premise of equal desulfurized effect, required desulfurizing agent sodium carbonate slurries
Amount is few, therefore the flue-gas temperature that sulfur removal technology section can be further reduced on the basis of soda sulfur removal technology reduces amplitude, is follow-up
Remove NOx and favourable flue gas condition is provided, the advantages of reducing operating cost.
The utility model preferred embodiment disclosed above is only intended to help and illustrates the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, it is only described embodiment also not limit the utility model.Obviously, according to this theory
The content of bright book, it can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is in order to preferably
Principle and practical application of the present utility model is explained, so that skilled artisan can be best understood by and utilize this
Utility model.The utility model is only limited by claims and its four corner and equivalent.
Claims (6)
1. a kind of coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems based on SDA methods, it is characterised in that including Desulphurization
Storehouse, white lime storehouse, desulfurizer regeneration tank, cyclone, soda powder cabin, desulfurizing agent feed tank, rotating spraying desulfurizing tower, defeated ash silo pump
And chimney；
Described desulfurization ash silo and described white lime storehouse are connected with described desulfurizer regeneration tank respectively, and described desulfurizing agent is again
Raw tank is connected with described cyclone again, wherein, the second outlet underflow of described cyclone is connected with gypsum retracting device, institute
The first outlet for the cyclone stated is upper to be connected with described desulfurizing agent feed tank, described desulfurizing agent feed tank also respectively with institute
The soda powder cabin stated connects with described rotating spraying desulfurizing tower, described rotating spraying desulfurizing tower also respectively with described defeated ash
Storehouse pump is connected with described chimney, and described defeated ash silo pump is also connected with described desulfurization ash silo.
2. the coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems according to claim 1 based on SDA methods, its feature
It is, the top of described rotating spraying desulfurizing tower is provided with atomizer and top tank, described top tank and described desulfurizing agent feed flow
Tank connects, and flue gas enters described rotating spraying desulfurizing tower in described atomizer and desulfurization through coke oven turning plate valve leading portion flue
Agent slurry reaction desulfurization.
3. the coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems according to claim 1 based on SDA methods, its feature
Be, the bottom of described rotating spraying desulfurizing tower is provided with sack cleaner, described sack cleaner respectively with it is described defeated
Ash silo pump connects with described chimney, draws grey machine provided with flue gas between described sack cleaner and described chimney, described
Defeated ash silo pump be located at the bottom of described sack cleaner.
4. the coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems according to claim 3 based on SDA methods, its feature
It is, flue gas cold blast sliding valve is provided between described rotating spraying desulfurizing tower and described sack cleaner；Described cloth bag removes
Hand operated gate valve is provided between dirt device and described defeated ash silo pump.
5. the coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems according to claim 1 based on SDA methods, its feature
It is, described gypsum retracting device is gypsum dehydration machine.
6. the coke oven flue gas Sodium/Calcium base combined desulfurization dedusting SDG systems according to claim 1 based on SDA methods, its feature
It is, described desulfurizer regeneration tank is provided with oxidation fan.
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| CN107126830A (en) * | 2017-06-30 | 2017-09-05 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG system and method based on SDA methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107126830A (en) * | 2017-06-30 | 2017-09-05 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG system and method based on SDA methods |
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Effective date of registration: 20201110 Address after: Building 1, No. 1508 Mudanjiang Road, Baoshan District, Shanghai, 201900 Patentee after: Baowu Water Technology Co., Ltd Address before: 201999, Shanghai, Baoshan District, 550 grams Road, No. 7, No. business building, 2 and 3 Patentee before: SHANGHAI BAOSTEEL ENERGY TECH Co.,Ltd. |