CN203710919U - Calcium-oxide-containing fly ash separating and slaking integration device - Google Patents
Calcium-oxide-containing fly ash separating and slaking integration device Download PDFInfo
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- CN203710919U CN203710919U CN201320818487.5U CN201320818487U CN203710919U CN 203710919 U CN203710919 U CN 203710919U CN 201320818487 U CN201320818487 U CN 201320818487U CN 203710919 U CN203710919 U CN 203710919U
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Abstract
The utility model discloses a calcium-oxide-containing fly ash separating and slaking integration device suitable for recovering calcium oxide from fly ash in a circulating fluidized bed boiler and preparing slaked lime. The device mainly comprises a fly ash feeding system, a separation system, a slaking system, an induced draught system, a waste ash recovery storage bin and a slaked lime storage bin, wherein the separation system comprises a cyclone separator and a fluidization separator; the slaking system comprises a steam fluidized bed, a cyclone separator and a cloth bag dust remover. According to device, calcium-containing fly ash is separated through the separation system, the fly ash with relatively high calcium oxide content enters the steam fluidized bed and is fluidized under the action of overheat steam, and calcium oxide and the steam are subjected to slaking reaction to form calcium hydroxide which enters the cyclone separator; incompletely slaked calcium oxide and other ash contents return to the fluidized bed through the cyclone separator to be slaked again until most of calcium oxide in the fly ash is slaked to form calcium hydroxide; products with high calcium hydroxide contents enter the slaked lime storage bin through a discharging hole of the steam fluidized bed and a discharging hole of the cloth bag dust remover respectively.
Description
Technical field
The present invention relates to a kind of calcium oxide flying dust separating digesting integrated device that contains, be applicable to the application on CFBB, strengthen utilization and the activation of calcium oxide in its flying dust, and reach better desulfurization economic effect.
Background technology
Combustion technology of circulating fluidized is a kind of effective Filter Tuber For Clean Coal combustion technology, has coal adaptability wide, and efficiency of combustion is high, the advantages such as harmful gas emission is few, under increasingly serious energy shortage and environmental requirement, the development along with power industry, is widely applied in China.In recent years, China is obtaining greater advance, existing economic interests aspect the basic research of recirculating fluidized bed lime-ash and new Application and Development; again environmental protection and industrial sustainable development are had to reality and far-reaching significance; therefore, understand the characteristic of lime-ash, research and develop and new utilize approach extremely important.
CFBB is after dropping into limestone desulfurization technique in stove, flying dust contains fails the fully calcium oxide of reaction in a large number.Desulfuration in furnace is to take lime stone as absorbent, and under 830 ℃～900 ℃ bed temperatures, lime stone is subject to high-temperature calcination to be decomposed into calcium oxide and carbon dioxide in burner hearth, becomes the calcium oxide particle with loose structure; After sulfur dioxide in flue gas contacts with calcium oxide, there is chemical reaction and generate calcium sulfate.But the formation of calcium sulfate is the pore stopping up in calcium oxide, makes sulfur dioxide gas molecule can not continue to be deep into that the calcium oxide particle of loose structure is inner reacts with calcium oxide, thereby reduce greatly the activity of calcium oxide.Calcium oxide over half can not be utilized completely in desulphurization reaction.At general fluidized-bed combustion boiler, it is between 2.0-2.4 that the injected volume of lime stone generally need to reach calcium sulfur ratio, and major part not the calcium oxide of complete reaction the flying dust with in flue gas is discharged, in addition, recirculating fluidized bed factor such as circulating ratio, ignition temperature, fluidising air velocity and limestone granularity and character in actual moving process also can exert an influence to the reaction efficiency of calcium oxide, makes calcium oxide can not all participate in reaction.Therefore, in recirculating fluidized bed flying dust and slag, the content of calcium oxide is all higher.
Better active and utilize for calcium oxide in the flying dust of CFBB can be obtained, and improve desulfuration efficiency, researched and developed at present the desulphurizing ability again that several technology improve flying dusts:
The technology of strile-bacing: adopt this technology to send the circulating fluidized bed desulfur flying dust of collecting and coal blending back to boiler, make flying dust after-flame, improve the utilization rate of contained desulfurizing agent in flying dust or the addition of reduction desulfurizing agent, but this technology because of the average diameter of fly ash granule little, calcium oxide activity is low, flutterring of separator caught scarce capacity so that such particle participates in circulation, and the flying dust time of staying is few, and therefore strile-back effect and desulfurized effect are not obvious.
Compressing tablet or granulating technique: this technology the fine particle of flying dust is pressed into sheet or with comminution granulation by flying dust granulation shape, send fluid bed back to and participate in desulfurization and burning, flying dust is by compressing tablet or granulation, bulk density increases, and the time of staying in fluid bed increases, and burn-off rate and desulfurization degree also improve greatly, shortcoming is that this technique need to increase extra equipment and power, very difficult integrated with boiler, can not produce continuously, so recycling expense is high.
Water activation recycling technology: this technology is for improving utilization rate and the recirculation desulfurization degree of active calcium oxide.In flying dust, calcium oxide content is high, but the amount of active calcium oxide is not high, water reacts at a certain temperature with flyash, calcium oxide activation is calcium hydroxide, pore structure and the specific area of flying dust are improved greatly, and the calcium oxide that major part has neither part nor lot in desulfurization is because the covering that priming reaction departs from calcium sulfate comes out, and has increased the chance contacting with sulfur dioxide, flying dust recirculation after activation is used, and can greatly improve desulphurizing ability.Research shows, flying dust activation degree is except outside the Pass having with its chemical composition, in close relations with hydrating condition, general hydration time is longer, water activation temperature is higher, and the activation degree of flying dust is larger, and the flying dust again ability of desulfurization is stronger, but the shortcoming of this technology is if that flying dust soak time is oversize, the connectivity of aquation technique and steam generator system is just difficult to grasp.
In addition, ripe slaker is high to the purity requirement of calcium oxide at present, once calcium oxide purity changes, slaker cannot guarantee the effect of digestion.And the concentration of its calcium oxide of flying dust of fluidized-bed combustion boiler successively changes, by the calcium oxide purity after separation, also can constantly change, be difficult to carry out digestion reaction with ripe at present slaker.
Summary of the invention
In order to solve problems of the prior art, reclaiming calcium oxide in circulating fluidized bed desulfur flying dust utilizes again, the invention provides a kind of containing calcium oxide flying dust separating digesting integrated device, this separating digesting integrated device is selectively separated by the flying dust from steam generator system deduster the ash content that calcium oxide content is higher successively in piece-rate system, and in the steam fluid bed of digestive system, calcium oxide digestion is transformed into calcium hydroxide, activate its desulphurizing ability.Steam fluid bed can make calcium oxide contact fully with steam, reaches best digestion effect.
Technical scheme of the present invention is: a kind of containing calcium oxide flying dust separating digesting integrated device, it comprises flying dust feed system, piece-rate system, induced draught system, it also comprises that digestive system, useless ash reclaim warehouse and calcium hydroxide warehouse, and described piece-rate system comprises the first cyclone separator and fluidisation separator; Described digestive system comprises steam fluid bed, the second cyclone separator and sack cleaner; Described the first cyclone separator is connected with flying dust feed system, and the upper conveyance conduit of the first cyclone separator is connected with the steam fluid bed top of digestive system, and the first cyclone separator below discharging opening connects fluidisation separator by batcher; Described fluidisation separator top exit is connected with the steam fluid bed of digestive system, its bottom is provided with air header, air connects case and is provided with separator air distribution plate, and one end of fluidisation separator bottom is provided with discharging opening, and discharging opening connects useless ash through screw(-type) feeder and reclaims warehouse; In described digestive system, the feed back region at steam fluid bed, the second cyclone separator and place thereof is by radian baffle for separating; Steam header is established in steam fluid bed bottom, and steam header is provided with fluidized bed air distribution plate, and steam fluid bed bottom discharge mouth is connected with calcium hydroxide warehouse by discharge pipe; Top, described feed back region is provided with one or more the second cyclone separators, steam fluid bed top is established flow distribution plate and is connected with the entrance of the second cyclone separator respectively, feed back regional export below is provided with baffle plate, and the upper conveyance conduit of the second cyclone separator is connected with sack cleaner; The flying dust amount that the conveyance conduit of described sack cleaner bottom is divided into two-way and enters each road by two-way switch baffle controls, one road pipeline is connected with the calcium hydroxide warehouse that batcher is set, another road pipeline is connected with steam fluid bed, and sack cleaner top is connected with air-introduced machine by gas pipeline.
Flow media in described air header is air, and air makes flying dust be fluidization with certain pressure by separator air distribution plate.
Flow media in described steam header is superheated steam, basis is entered to the flying dust flow of digestive system to the temperature and pressure of superheated steam and the temperature of steam fluid bed is adjusted, and the superheated steam in steam header makes flying dust be fluidization with certain pressure by fluidized bed air distribution plate
The returning charge conveyance conduit of described sack cleaner and the junction of steam fluid bed are positioned at the top of baffle plate.
The invention has the beneficial effects as follows: this separating digesting integrated device makes to be reclaimed from the calcic flying dust of CFBB dust pelletizing system again, reactivation.When coordinating operation with fluidized-bed combustion boiler, can more effectively increase desulfuration efficiency, reduce operating cost.This apparatus structure is simple, invests lessly, and operational management is easy.
Accompanying drawing explanation
Fig. 1 is a kind of work system figure containing calcium oxide flying dust separating digesting integrated device.
Fig. 2 is the A-A view of Fig. 1.
In figure: I, flying dust feed system, II, piece-rate system, III, digestive system, IV, induced draught system, V, useless ash reclaims warehouse, VI, calcium hydroxide warehouse, 1, the first cyclone separator, 1a, central tube, 1b, upper conveyance conduit, 2, batcher, 3, fluidisation separator, 3a, air header, 3b, separator air distribution plate, 3c, discharging opening, 4, screw(-type) feeder, 5, conveyance conduit, 6, steam fluid bed, 6a, steam header, 6b, fluidized bed air distribution plate, 6c, flow distribution plate, 7, arc-shaped partition, 8, the second cyclone separator, 8a, central tube, 8b, upper conveyance conduit, 9, feed back region, 10, baffle plate, 11, discharge pipe, 12, sack cleaner, 12a, lower conveyance conduit, 12b, returning charge conveyance conduit, 13, gas pipeline, 14, air-introduced machine, 15, two-way switch baffle plate, 16, batcher.
The specific embodiment
Fig. 1,2 shows a kind of work system figure containing calcium oxide flying dust separating digesting integrated device.In figure, flying dust separating digesting integrative machine mainly comprises flying dust feed system I, piece-rate system II, digestive system III, induced draught system IV, waste recovery warehouse V and calcium hydroxide warehouse VI, piece-rate system II comprises the first cyclone separator 1 and fluidisation separator 3, digestive system III comprises steam fluid bed 6, the second cyclone separator 8 and sack cleaner 12, and induced draught system IV comprises gas pipeline 13 and air-introduced machine 14.Flying dust feed system I is tangentially connected with the first cyclone separator 1, and the upper conveyance conduit 1b of the first cyclone separator 1 is connected with steam fluid bed 6 tops of digestive system III, and the first cyclone separator 1 below discharging opening is connected with fluidisation separator 3 by batcher 2.Fluidisation separator 3 top exits are connected with steam fluid bed 6, air header 3a is established in its bottom, on air header 3a, establish separator air distribution plate 3b, the useless ash of the bottom discharge mouth 3c connecting band screw(-type) feeder 4 of fluidisation separator 3 reclaims warehouse V, and useless ash reclaims warehouse V and is connected with conveyance conduit 5.Steam fluid bed 6, the second cyclone separator 8 and feed back region 9, place thereof are separated by arc-shaped partition 7, steam header 6a is established in steam fluid bed 6 bottoms, on steam header 6a, establish fluidized bed air distribution plate 6b, steam fluid bed 6 bottom discharge mouths are connected with calcium hydroxide warehouse VI by discharge pipe 11, two the second cyclone separators 8 are established at 9 tops, feed back region of digestive system III, steam fluid bed 6 tops are established flow distribution plate 6c and are tangentially connected with the entrance of the second cyclone separator 8 respectively, the 9 outlet belows baffled 10, feed back region of digestive system III, the upper conveyance conduit 8b of the second cyclone separator 8 is connected with sack cleaner 12.The lower conveyance conduit 12a of sack cleaner 12 bottoms and bypass conveyance conduit 12b control by two-way switch baffle plate 15, lower conveyance conduit 2a is connected with the calcium hydroxide warehouse VI that batcher 16 is set, returning charge conveyance conduit 12b is connected with steam fluid bed 6, and sack cleaner 12 tops are connected with air-introduced machine 14 by gas pipeline 13.
Above-mentioned technical scheme, first flying dust from dust conveying system I enters the first cyclone separator 1 in piece-rate system II, the flying dust that calcium oxide content is higher, the ash content that density is less and granularity is less enter central tube 1a and via upper conveyance conduit 1b, deliver to the steam fluid bed 6 of digestive system III, and be not separated large containing calcium oxide flying dust, density and flying dust composition that granularity is larger are because the effect of centrifugal force flows downward, from the first cyclone separator 1 bottom, discharge, through batcher 2, enter fluidisation separator 3.Fluidisation separator 3 bottoms arrange air header 3a, air passes through in separator air distribution plate 3b inlet flow separator 3 under certain pressure, make the flying dust entering in it be fluidization, than flowing downward under Action of Gravity Field containing the large flying dust composition of calcium oxide flying dust density and entering useless ash through bottom discharge mouth 3c, reclaim warehouse V, through screw(-type) feeder 4, enter conveyance conduit 5 again, and containing calcium oxide flying dust and the lighter flying dust composition of density, upwards flow into the steam fluid bed 6 of digestive system III.
Steam fluid bed 6 bottoms arrange steam header 6a, superheated steam is under certain pressure, by fluidized bed air distribution plate 6b, enter in steam fluid bed 6, in bed, strong fluidisation makes fully to mix with superheated steam containing calcium oxide flying dust, and combination reaction generation calcium hydroxide occurs rapidly.Fly ash mixture and steam upwards flow, and through the convergent space of arc-shaped partition 7, accelerate gradually, and the final shunting by flow distribution plate 6c enters respectively the second cyclone separator 8 and carries out further separation.What major part did not react completely flows downward containing calcium oxide fly ash mixture, and through the cushioning effect of plate washer 10, again return to steam fluid bed 6 and digest, in addition, the flying dust that calcium hydroxide content is more and density flying dust composition light, that granularity is less enters sack cleaner 12 by central tube 8a and upper conveyance conduit 8b, then being delivered to calcium hydroxide warehouse VI by lower conveyance conduit 12a, steam and a small amount of air are by the top exit of sack cleaner 12 and outwards discharge by gas pipeline 13 and air-introduced machine 14.As too much in the flying dust calcium oxide content in sack cleaner 12, can under 15 operations of two-way switch baffle plate, be returned in steam fluid bed 6 by bypass conveyance conduit 12b, again carry out digestion reaction, according to reacting finisheding degree, what do not complete reaction can make repeatedly circular response containing calcium oxide flying dust, reaches maximum digestion.Steam fluid bed 6 bottom discharge mouths meeting time openings, will be containing calcium hydroxide fly ash carry to calcium hydroxide warehouse VI by discharge pipe 11.
Claims (4)
1. one kind contains calcium oxide flying dust separating digesting integrated device, it comprises flying dust feed system (I), piece-rate system (II), induced draught system (IV), it is characterized in that: further comprising digestive system (III), useless ash recovery warehouse (V) and calcium hydroxide warehouse (VI), described piece-rate system (II) comprises the first cyclone separator (1) and fluidisation separator (3); Described digestive system (III) comprises steam fluid bed (6), the second cyclone separator (8) and sack cleaner (12); Described the first cyclone separator (1) is connected with flying dust feed system (I), the upper conveyance conduit (1b) of the first cyclone separator (1) is connected with steam fluid bed (6) top of digestive system (III), and the first cyclone separator (1) below discharging opening connects fluidisation separator (3) by batcher (2); Described fluidisation separator (3) top exit is connected with the steam fluid bed (6) of digestive system (III), its bottom is provided with air header (3a), air connects case and is provided with separator air distribution plate (3b), one end of fluidisation separator (3) bottom is provided with discharging opening (3c), and discharging opening (3c) connects useless ash through screw(-type) feeder (4) and reclaims warehouse (V); In described digestive system (III), the feed back region (9) at steam fluid bed (6), the second cyclone separator (8) and place thereof is to be separated by radian dividing plate (7); Steam header (6a) is established in steam fluid bed (6) bottom, and steam header (6a) is provided with fluidized bed air distribution plate (6b), and steam fluid bed (6) bottom discharge mouth is connected with calcium hydroxide warehouse (VI) by discharge pipe (11); Top, described feed back region (9) is provided with one or more the second cyclone separators (8), steam fluid bed (6) top is established flow distribution plate (6c) and is connected with the entrance of the second cyclone separator (8) respectively, outlet below, feed back region (9) is provided with baffle plate (10), and the upper conveyance conduit (8b) of the second cyclone separator (8) is connected with sack cleaner (12); The conveyance conduit of described sack cleaner (12) bottom is divided into two-way and by two-way switch baffle plate (15), controls the flying dust amount that enters each road, one road pipeline is connected with the calcium hydroxide warehouse (VI) that batcher (16) is set, another road pipeline is connected with steam fluid bed (6), and sack cleaner (12) top is connected with air-introduced machine (14) by gas pipeline (13).
2. a kind of calcium oxide flying dust separating digesting integrated device that contains according to claim 1, is characterized in that: the flow media in described air header (3a) is air, and air makes flying dust be fluidization with pressure by separator air distribution plate (3b).
3. according to claim 1 a kind of containing calcium oxide flying dust separating digesting integrated device, it is characterized in that: the flow media in described steam header (6a) is superheated steam, the temperature and pressure of superheated steam is by according to entering the flying dust flow of digestive system (III) and the temperature of steam fluid bed (6) is adjusted, and the superheated steam in steam header (6a) makes flying dust be fluidization with pressure by fluidized bed air distribution plate (6b).
4. according to claim 1 a kind of containing calcium oxide flying dust separating digesting integrated device, it is characterized in that: the returning charge conveyance conduit (12b) of described sack cleaner (12) and the junction of steam fluid bed (6) are positioned at the top of baffle plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818487.5U CN203710919U (en) | 2013-12-13 | 2013-12-13 | Calcium-oxide-containing fly ash separating and slaking integration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818487.5U CN203710919U (en) | 2013-12-13 | 2013-12-13 | Calcium-oxide-containing fly ash separating and slaking integration device |
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| CN203710919U true CN203710919U (en) | 2014-07-16 |
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| CN201320818487.5U Withdrawn - After Issue CN203710919U (en) | 2013-12-13 | 2013-12-13 | Calcium-oxide-containing fly ash separating and slaking integration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657412A (en) * | 2013-12-13 | 2014-03-26 | 中能东讯新能源科技(大连)有限公司 | Calcium-oxide-containing flying ash separation and digestion all-in-one device |
-
2013
- 2013-12-13 CN CN201320818487.5U patent/CN203710919U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657412A (en) * | 2013-12-13 | 2014-03-26 | 中能东讯新能源科技(大连)有限公司 | Calcium-oxide-containing flying ash separation and digestion all-in-one device |
| CN103657412B (en) * | 2013-12-13 | 2015-08-26 | 中能东讯新能源科技(大连)有限公司 | A kind of containing calcium oxide flying dust separating digesting integrated device |
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Granted publication date: 20140716 Effective date of abandoning: 20150826 |
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