CN204841409U - High -efficient gradual change is compound desulfurizing tower in grades - Google Patents
High -efficient gradual change is compound desulfurizing tower in grades Download PDFInfo
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Abstract
The utility model discloses a high -efficient gradual change is compound desulfurizing tower in grades, including the tower body, it is supreme including oxidation crystallized region, thick desulfurization remove dust section, smart desulfurization remove dust section and horizontal defogging section from down in the tower body, the oxidation crystallized region including the thick liquid pond, set up in the thick liquid pond and will starch the pond divide into about the partition mechanism in two districts, thick desulfurization dust removal section sprays the layer including gas distribution board, the multilayer that sets up above the flue gas entry, spray the layer and starch the pond and be connected, smart desulfurization remove dust the section including the tubular defroster, wash layer, film and hold the liquid layer, hold liquid layer circulation jar, hold in the liquid layer circulation jar the pH value that the pH value of thick liquid is greater than thick liquid in the thick liquid pond. The utility model is used for handling medium -high sulfur coal, sulphur coal flue gas, having high desulfurization efficiency and dust removal performance, desulfurization efficiency exceedes 99%.
Description
Technical field
The utility model relates to a kind of desulfurizing tower, particularly relates to a kind of efficient gradual change classification composite desulfate tower.
Background technology
In recent years, coal-burning power plant of China tackles the environmental protection limit value pressure of country in order to be eager, generally adopt price higher, but the middle low-sulfur coal that sulfur content is low, ash is low, calorific value is higher, the minimum discharge technology being applicable to middle low-sulfur coal (Sar<1.5%) is successfully gone into operation operation.But, up to now, not yet there is the case being applicable to middle height, the minimum discharge technology of sulphur coal (Sar>1.5%) successfully puts into operation.
But have the coal sulfur content of about 30% in coal resources in China more than 2%, especially some colliery sulfur content of southwest is up to 10%, area is because economy, the regional difference of ature of coal in Shanxi etc., widely uses the ature of coal of sulfur content more than 2%; Meanwhile, along with the use amount of fat coal is increasingly sharpened, coal-burning power plant of China must reduce day by day in the face of low-sulfur coal, and fuel cost rises, and is forced to use the situation of middle height, sulphur coal; In addition, country and local government go into overdrive control thermal power plant Pollutant emission concentration, propose discharge standard strict in a series of history, these strict standards also need to have deep desulfuration, the high-performance desulfur technology of high-effective dust-removing realizes.
Containing a large amount of SO in coal-fired flue-gas
2, flue dust, also containing a small amount of HCl, HF, SO
3, the pollutant such as heavy metal, it is wet flue gas desulfurizer that current flue gas desulfurization adopts maximum, most widely used with Gypsum Wet again in wet desulphurization.Desulfurization method of limestone-gypsum tower major function is for removing SO
2, also there is the miscellaneous function removing flue dust and other pollutant simultaneously.The desulfuration efficiency of general wet desulphurization requires to be 90% ~ 95%.At home, have desulfuration efficiency be 98% successful operation case, but burning high sulfur coal unit energy is reached to the wet desulphurization device of Gas Generator Set emission request, does not use precedent.And external wet desulphurization device, the total amount shared by its coal unit little (compared with domestic), also not high performance like this desulfurization requirement.
For medium-high sulfur coal, sulphur coal, realize SO in desulfurizer exiting flue gas
2content is reduced to 35mg/Nm
3below, desulfuration efficiency more than 99%, will even need higher desulfuration efficiency.Therefore, research and development Novel desulfurization tower, improves the deep desulfuration performance of desulfurizing tower, makes the SO in discharge flue gas
2lower than 35mg/Nm
3, even realize lower than 20mg/Nm
3ultralow SO
2discharge is the vital task solving medium-high sulfur coal, sulphur coal smoke gas treatment, to solution haze problem, improves air quality, has positive effect.
Limestone-gypsum desulfurizing tower generally adopts the form of single spray column, and reflux type is arranged.Flue gas enters by absorption tower entrance in absorption tower from slurry pool top, successively by after spraying layer, demister, through smoke stack emission.Slurries are sprayed by the multiple nozzle of each spraying layer, move downward, contact with flue gas adverse current and physics and chemical action occur, carry out washing to the sulfur dioxide in flue gas to remove, there is the effects such as inertial collision, interception, diffusion, cohesion and gravitational settling between dust granules simultaneously in air-flow and drop, dust is captured.Slurries absorb sulfur oxide SO from flue gas
2, fall into desulfurizing tower hypomere stock tank after flue dust and other pollutant, and in stock tank, be forced oxidation, crystallization.
The main cause that the desulfuration efficiency of conventional limestone-gypsum desulfurizer is restricted has two: 1) by the restriction of the conditions such as gypsum oxidation and crystallization, lime stone dissolving and control consumption, the pH value of usual absorption slurries, between 5.2 ~ 5.8, limits the activity of absorbent; 2) by the restriction of single tower, the total flow absorbing slurries can not be excessive, otherwise will cause fluid overload in tower, causes flue gas pressure drop sharply to increase, and cannot operate.
In order to solve the problem, column in series technology receives certain application.Series connection absorption tower is together in series two absorption towers exactly by flue.First the flue gas that boiler induced-draft fan is come enters first order absorption tower, and the washing through first order absorption tower is by the part SO in flue gas
2remove, desulfuration efficiency is generally 30 ~ 80%, and slurries pH controls 4.5 ~ 5.3, and the major function that this grade absorbs ensures excellent calcium sulfite oxidation effect, and the gypsum crystallization time of abundance.Particularly for sulphur coal, oxidation air coefficient can reduce greatly, thus significantly reduces the power consumption of oxidation fan, and greatly can improve gypsum qualitt simultaneously, improves gypsum dehydration rate.Flue gas out enters absorption tower, the second level afterwards from first order absorption tower, absorption tower, the second level is main desulfurization washing process, owing to need not consider the problem of oxidizing and crystallizing, so pH can control in very high level, reach 5.8 ~ 6.4, this just takes full advantage of absorbent efficient removal SO
2performance, by SO in desulfurizing tower exiting flue gas
2content be reduced to less scope.
Although column in series technology achieves the desulfuration efficiency of medium-high sulfur coal, sulphur coal superelevation to a certain extent, solve the problem of its qualified discharge, column in series technology also has shortcomings: 1) project initial cost is high; 2) owing to arranging two-stage absorption tower, floor space is large, and for the transformation of existing apparatus, a large amount of projects cannot be implemented; 3) equipment is relatively many, and equipment failure rate is high, repair and maintenance workload large, and operating cost is high.
Utility model content
The purpose of this utility model is to provide a kind of efficient gradual change classification composite desulfate tower, and it is for the treatment of medium-high sulfur coal, sulphur coal flue gas, and have high desulfuration efficiency and dust removal performance, desulfuration efficiency is more than 99%.
The utility model solves the technical scheme that its technical problem adopts:
A kind of efficient gradual change classification composite desulfate tower is provided, this desulfurizing tower comprises tower body, the middle part of described tower body offers smoke inlet, the top of described tower body offers exhanst gas outlet, comprises oxidizing and crystallizing section, thick desulfurization and dedusting section, fine de-sulfur dedusting section and horizontal demist section in described tower body from bottom to up; Wherein,
Described oxidizing and crystallizing section comprises the stock tank that is arranged on bottom tower body and to be horizontally set in described stock tank and described stock tank to be divided into the partition in upper and lower Liang Ge district, be provided with many oxidation air distributor pipes in superposed zoneofoxidation, the crystal region being positioned at bottom is provided with multiple agitator;
Described thick desulfurization and dedusting section comprises and is arranged on gas distribution grid above smoke inlet, is arranged on Multi-layer sprinkling layer above described gas distribution grid, and described spraying layer is connected with stock tank crystal region;
Described fine de-sulfur dedusting section comprises tubular demister, be arranged on the flushing layer above described tubular demister, the film be arranged on above described flushing layer holds liquid layer, and hold that liquid layer is connected with described film hold liquid layer circulating tank, described film is held liquid layer and is comprised the liquid header set gradually from bottom to up, S type gas-liquid mass transfer mechanism and liquid distribution trough, described liquid header is connected with the entrance holding liquid layer circulating tank, described outlet of holding liquid layer circulating tank is connected with liquid distribution trough by holding liquid layer circulating pump, the described pH value holding slurries in liquid layer circulating tank is greater than the pH value of slurries in stock tank.
By technique scheme, described partition is porous plate or many combs placed side by side.
By technique scheme, the below described tower body inwall being positioned at every layer of spraying layer arranges gas-liquid mass transfer CPR dust, and the vertical section of described gas-liquid mass transfer CPR dust is triangle.
By technique scheme, the height of described gas-liquid mass transfer CPR dust is 300 ~ 2000mm.
By technique scheme, the nozzle on described spraying layer is single head nozzle or double end atomizer.
By technique scheme, described stock tank is built with gypsum slurries, and the pH value of described gypsum slurries is 5.2 ~ 5.8.
By technique scheme, described in hold liquid layer circulating tank built with lime stone slurry, the pH value of described lime stone slurry is 5.8 ~ 6.4.
By technique scheme, the strip plate body laid out in parallel that described S type gas-liquid mass transfer mechanism is horizontal S type by multiple cross section forms, and between adjacent plate body, interlaced and interval, S type end is arranged, and this interval forms air-flow passageway.
By technique scheme, described plate body S type end lower edge is provided with trapezoidal, rectangle or leg-of-mutton venthole.
By technique scheme, described horizontal demist section comprises 1 ~ 4 grade of horizontal flue demister, and this demister is provided with independently water and rinses and Water Sproading unit.
The utility model, there is following beneficial effect: this desulfurizing tower adopts gradual change classification composite desulfate technology, there is high desulfuration efficiency and dust removal performance, desulfuration efficiency reaches more than 99%, and efficiency of dust collection reaches more than 90%, is suitable for processing medium-high sulfur coal, sulphur coal flue gas, especially sulphur coal flue gas is processed, meanwhile, because this desulfurizing tower is single tower, be particularly suitable for area stenosis, take up an area limited existing desulfurizer transformation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of S type gas-liquid mass transfer mechanism in the utility model;
Fig. 3 is the structural representation of liquid distribution trough in the utility model;
Fig. 4 is the structural representation of liquid header in the utility model;
Fig. 5 is the structural representation of gas-liquid mass transfer CPR dust in the utility model;
Fig. 6 is the structural representation of gas distribution grid in the utility model;
Fig. 7 is the structural representation of a partition embodiment in the utility model;
Fig. 8 is the structural representation of another embodiment of partition in the utility model.
In figure: 1-smoke inlet, 2-gas distribution grid, 3-spraying layer, 4-gas-liquid mass transfer CPR dust, 5-tubular demister, 6-rinse layer, 7-liquid header, 8-S type gas-liquid mass transfer mechanism, 801-plate body, 9-liquid distribution trough, 10-horizontal flue demister, 11-exhanst gas outlet, 12-holds liquid layer circulating tank, 13-holds liquid layer circulating pump, 14-agitator, 15-oxidation air distributor pipe, 16-partition, 1601-porous plate, 1602-comb, 17-tower body.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In preferred embodiment of the present utility model, as Figure 1-Figure 8, a kind of efficient gradual change classification composite desulfate tower, this desulfurizing tower comprises tower body 17, the middle part of tower body 17 offers smoke inlet 1, the top of tower body 17 offers exhanst gas outlet 11, comprises oxidizing and crystallizing section, thick desulfurization and dedusting section, fine de-sulfur dedusting section and horizontal demist section in tower body 17 from bottom to up; Wherein,
Oxidizing and crystallizing section comprises the stock tank that is arranged on bottom tower body 17 and to be horizontally set in stock tank and stock tank to be divided into the partition 16 in upper and lower Liang Ge district, be provided with many oxidation air distributor pipes 15 in superposed zoneofoxidation, the crystal region being positioned at bottom is provided with multiple agitator 14;
Thick desulfurization and dedusting section comprises and is arranged on gas distribution grid 2 above smoke inlet 1, is arranged on Multi-layer sprinkling layer 3 above gas distribution grid 2, and spraying layer 3 is connected with stock tank crystal region;
Fine de-sulfur dedusting section comprises tubular demister 5, be arranged on the flushing layer 6 above tubular demister 5, be arranged on the film rinsed above layer 6 and hold liquid layer, and hold that liquid layer is connected with film hold liquid layer circulating tank 12, film is held liquid layer and is comprised the liquid header 7 set gradually from bottom to up, S type gas-liquid mass transfer mechanism 8 and liquid distribution trough 9, liquid header 7 is connected with the entrance holding liquid layer circulating tank 12, the outlet of holding liquid layer circulating tank 12 is connected with liquid distribution trough 9 by holding liquid layer circulating pump 13, the pH value holding slurries in liquid layer circulating tank 12 is greater than the pH value of slurries in stock tank.
In preferred embodiment of the present utility model, as shown in Figure 7, Figure 8, partition 16 is porous plate 1601 or many combs 1602 placed side by side.
In preferred embodiment of the present utility model, as shown in Figure 1, shown in Figure 5, below tower body 17 inwall being positioned at every layer of spraying layer 3 arranges gas-liquid mass transfer CPR dust 4, and the vertical section of gas-liquid mass transfer CPR dust 4 is triangle, wherein, the height of gas-liquid mass transfer CPR dust 4 is 300 ~ 2000mm.
In preferred embodiment of the present utility model, as shown in Figure 1, the nozzle on spraying layer 3 is single head nozzle or double end atomizer.
In preferred embodiment of the present utility model, as shown in Figure 1, stock tank is built with gypsum slurries, and the pH value of gypsum slurries is 5.2 ~ 5.8.
In preferred embodiment of the present utility model, as shown in Figure 1, hold liquid layer circulating tank 12 built with lime stone slurry, the pH value of lime stone slurry is 5.8 ~ 6.4.
In preferred embodiment of the present utility model, as shown in Figure 1 and Figure 2, strip plate body 801 laid out in parallel that S type gas-liquid mass transfer mechanism 8 is horizontal S type by multiple cross section forms, and interlaced and interval, adjacent plate body 801 S type ends is arranged, and this interval forms air-flow passageway.For uniform flue gas, improve the adaptability to gas load fluctuation, plate body 801S type end lower edge is provided with trapezoidal, rectangle or leg-of-mutton venthole.
In preferred embodiment of the present utility model, as shown in Figure 1, horizontal demist section comprises 1 ~ 4 grade of horizontal flue demister 10, and this demister is provided with independently water and rinses and Water Sproading unit.
The utility model in use, the stock tank of bottom is divided into zoneofoxidation and crystal region by partition, and oxidation air distributor pipe is set in zoneofoxidation, to ensure the efficient oxidation of stock tank sulfite calcium, oxidation air distributor pipe adopts alloy material or nonmetallic materials; And relatively independent crystal region can make the crystalline particle of gypsum look larger, be not only conducive to the operation of follow-up dewatering system, can also ensure, except fog effect, to improve desulfurization and efficiency of dust collection; Separately, agitator or other disturbance formula rabbling mechanisms can being set in crystal region, depositing fouling for preventing gypsum.
The utility model adopts gradual change classification composite desulfate technology, different absorbents is adopted in the position that desulfurizing tower is different, the pH value of slurries also increases from bottom to top gradually, especially adopt lime stone slurry as absorbent in fine de-sulfur dedusting section, pH can control in very high level, reach 5.8 ~ 6.4, take full advantage of its high activity, hold liquid layer circulating tank and hold to film the lime stone slurry that liquid layer provides pH value higher.The mixed serum that the absorbent that spraying layer uses is limestone-gypsum, and the content of lime stone in mixed liquor increases from bottom to top gradually, therefore the pH value of mixed serum also increases from bottom to top gradually.
During work, flue gas enters in tower through smoke inlet, first under the obstruction of gas distribution grid, spread along gas distribution grid (gas distribution grid is porous plate) to surrounding, the flow velocity of larger flow velocity flue gas and less flow velocity flue gas on tower body cross section is mixed again, reach the effect of flow reallocation, make the distributed uniform on tower body cross section of the flue gas after by gas distribution grid, play the effect of uniform flue gas, the problem of flue gas bias current can be solved, improve desulfurization and efficiency of dust collection; Then under the effect of spraying layer, thick desulfurization and dedusting is carried out, the quantity of spraying layer is 1 ~ 5 layer, every layer of spraying layer is provided with independently circulating pump and circulating pipe system, gas-liquid mass transfer CPR dust is provided with inside tower wall below each spraying layer, nozzle on spraying layer is single head nozzle or double end atomizer, according to double end atomizer, two exports the spray direction gushed out can be identical, also can be contrary.
Fine de-sulfur dedusting section tackles a large amount of gypsum slurries by tubular demister, again by S type gas-liquid mass transfer mechanism, mass transfer effect can be improved further, make whole tower have high desulfuration efficiency and dust removal performance, total desulfuration efficiency of desulfurizing tower can realize more than 99%, at desulfurizing tower entrance SO
2content is 6500mg/Nm
3, desulfurizing tower outlet SO
2content can be reduced to 35mg/Nm
3below, at desulfurizing tower entrance SO
2content is 5000mg/Nm
3time, desulfurizing tower outlet SO
2content can be reduced to 20mg/Nm
3below, achieve the deep desulfuration of desulfurizing tower, separately, the nozzle rinsing layer upward, rinse, and holds the fouling of liquid layer bottom to prevent film by the bottom of film being held to liquid layer.Meanwhile, containing SO
2enter lime stone film slurry layer (it is 20 ~ 150mm that film holds lime stone slurry liquid membrane on liquid layer) with fume gases by S type gas-liquid mass transfer mechanism, evoke a large amount of bubbles and form froth bed, SO
2absorbed by slurries at froth bed, and flue dust is constantly subject to the disturbance of foam while inertia, diffusion, constantly changes direction, add the contact probability of flue dust and liquid, flue gas is purified.The dust removing effects of bubble type deduster has higher efficiency of dust collection than spray tower deduster, and the performance especially removing PM2.5 and following fine smoke is very high, far above the efficiency of dust collection of spraying layer.Therefore, efficiency of dust collection of the present utility model brings up to more than 90% from 50% of common desulphurization tower, and desulfurizing tower outlet smoke content can be reduced to 5mg/Nm
3below, while deep desulfuration, achieve the high-effective dust-removing of desulfurizing tower.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.
Claims (10)
1. an efficient gradual change classification composite desulfate tower, this desulfurizing tower comprises tower body (17), the middle part of described tower body (17) offers smoke inlet (1), the top of described tower body (17) offers exhanst gas outlet (11), it is characterized in that, in described tower body (17), comprise oxidizing and crystallizing section, thick desulfurization and dedusting section, fine de-sulfur dedusting section and horizontal demist section from bottom to up; Wherein,
Described oxidizing and crystallizing section comprises the stock tank that is arranged on tower body (17) bottom and to be horizontally set in described stock tank and described stock tank to be divided into the partition (16) in upper and lower Liang Ge district, be provided with many oxidation air distributor pipes (15) in superposed zoneofoxidation, the crystal region being positioned at bottom is provided with multiple agitator (14);
Described thick desulfurization and dedusting section comprises the gas distribution grid (2) being arranged on smoke inlet (1) top, the Multi-layer sprinkling layer (3) being arranged on described gas distribution grid (2) top, and described spraying layer (3) is connected with stock tank crystal region;
Described fine de-sulfur dedusting section comprises tubular demister (5), be arranged on the flushing layer (6) of described tubular demister (5) top, the film being arranged on described flushing layer (6) top holds liquid layer, and hold that liquid layer is connected with described film hold liquid layer circulating tank (12), described film is held liquid layer and is comprised the liquid header (7) set gradually from bottom to up, S type gas-liquid mass transfer mechanism (8) and liquid distribution trough (9), described liquid header (7) is connected with the entrance holding liquid layer circulating tank (12), described outlet of holding liquid layer circulating tank (12) is connected with liquid distribution trough (9) by holding liquid layer circulating pump (13), the described pH value holding liquid layer circulating tank (12) interior slurries is greater than the pH value of slurries in stock tank.
2. desulfurizing tower according to claim 1, is characterized in that, described partition (16) is porous plate or many combs placed side by side.
3. desulfurizing tower according to claim 1, it is characterized in that, the below described tower body (17) inwall being positioned at every layer of spraying layer (3) arranges gas-liquid mass transfer CPR dust (4), and the vertical section of described gas-liquid mass transfer CPR dust (4) is triangle.
4. desulfurizing tower according to claim 3, is characterized in that, the height of described gas-liquid mass transfer CPR dust (4) is 300 ~ 2000mm.
5. desulfurizing tower according to claim 1, is characterized in that, the nozzle on described spraying layer (3) is single head nozzle or double end atomizer.
6. desulfurizing tower according to claim 1, is characterized in that, described stock tank is built with gypsum slurries, and the pH value of described gypsum slurries is 5.2 ~ 5.8.
7. desulfurizing tower according to claim 1, is characterized in that, described in hold liquid layer circulating tank (12) built with lime stone slurry, the pH value of described lime stone slurry is 5.8 ~ 6.4.
8. desulfurizing tower according to claim 1, it is characterized in that, strip plate body (801) laid out in parallel that described S type gas-liquid mass transfer mechanism (8) is horizontal S type by multiple cross section forms, between adjacent plate body (801), interlaced and interval, S type end is arranged, and this interval forms air-flow passageway.
9. desulfurizing tower according to claim 8, is characterized in that, described plate body (801) S type end lower edge is provided with trapezoidal, rectangle or leg-of-mutton venthole.
10. desulfurizing tower according to claim 1, is characterized in that, described horizontal demist section comprises 1 ~ 4 grade of horizontal flue demister (10), and this demister is provided with independently water and rinses and Water Sproading unit.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520530484.0U CN204841409U (en) | 2015-07-21 | 2015-07-21 | High -efficient gradual change is compound desulfurizing tower in grades |
| PCT/CN2016/090766 WO2017012557A1 (en) | 2015-07-21 | 2016-07-20 | High-efficiency gradient hierarchy complex desulfurizing tower |
| US15/577,046 US10143957B2 (en) | 2015-07-21 | 2016-07-20 | High-efficiency gradient hierarchy complex desulfurizing tower |
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| CN201520530484.0U CN204841409U (en) | 2015-07-21 | 2015-07-21 | High -efficient gradual change is compound desulfurizing tower in grades |
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| US10143957B2 (en) | 2015-07-21 | 2018-12-04 | Huaneng Power International, Inc. | High-efficiency gradient hierarchy complex desulfurizing tower |
| CN105413407A (en) * | 2015-12-24 | 2016-03-23 | 浙江德创环保科技股份有限公司 | Synergistic layer, and desulfurization column therewith |
| CN105817122A (en) * | 2016-05-13 | 2016-08-03 | 芜湖飞尚非金属材料有限公司 | Tail gas desulfurization device for hot-blast stove |
| CN105879588A (en) * | 2016-05-19 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Double-circulation diameter-variable desulfurization and absorption system and method |
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| CN106984100A (en) * | 2017-05-27 | 2017-07-28 | 赵萍 | The special dedusting of LD type wet desulphurizations removes water unit |
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