CN103697488B - Cooperation-removal PM 2.5and the system of desulfurization and CFB system and method - Google Patents
Cooperation-removal PM 2.5and the system of desulfurization and CFB system and method Download PDFInfo
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- CN103697488B CN103697488B CN201310733395.1A CN201310733395A CN103697488B CN 103697488 B CN103697488 B CN 103697488B CN 201310733395 A CN201310733395 A CN 201310733395A CN 103697488 B CN103697488 B CN 103697488B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention discloses a kind of cooperation-removal PM
2.5and the system of desulfurization, comprise the high-pressure atomization water humidifying device be connected with exhanst gas outlet, wherein humidifying device, demister, deduster connect successively.The invention also discloses a kind of cooperation-removal PM
2.5and the circulating fluidized bed system of desulfurization, comprise burner hearth, wherein, burner hearth, cyclone separator, air preheater, humidifying device, demister, deduster are connected successively, and material returning device is connected with burner hearth and cyclone separator respectively.The invention also discloses the method corresponding with said system.Cooperation-removal PM of the present invention
2.5and the system of desulfurization, circulating fluidized bed system and method, removing PM
2.5while, by humidification, can also desulfurization again, improve the service efficiency of desulfurizing agent, improve the utilization rate of desulfurization Ca, confirm through test, this method can realize removing PM
2.5, desulfuration efficiency reaches more than 50% again, greatly reduces atmosphere pollution.
Description
Technical field
The present invention relates to energy-conserving and environment-protective field, especially a kind of cooperation-removal PM
2.5and the system of desulfurization and recirculating fluidized bed (CFB) system and method.
Background technology
PM
2.5refer to that air medium power diameter is less than or equal to the particle of 2.5 μm, also referred to as entering lung particle, PM in an atmosphere
2.5in particle, major part is the less particle that diameter is less than 1.0 μm.Due to this fine particulates by human body by breathe suck after, can stop for a long time in human respiratory tract, lung and blood, do not discharge from human body by modes such as coughs, therefore adverse influence is caused to the health of human body, these fine particulates are also cause atmospheric visibility to reduce, and form the major reason of haze weather.
PM
2.5formation mainly contain two approach: the superfine particulate matter of the direct discharge of (1) various industrial process (fire coal, metallurgy, chemical industry, internal combustion engine etc.); (2) superfine particulate matter that in air, secondary is formed and aerosol etc.China's primary energy is based on coal, and a large amount of coal burning causes serious harm to ecological environment, and has influence on the sustainable development of resource and environment.Except control SO
2with outside the discharge of NOx, PM
2.5the discharge of suspended particulate substance also can not be ignored.According to statistics, the discharge capacity of current national flyash has reached 1.5 hundred million t, although the efficiency of dust collection of existing dust arrester generally can up to more than 99%, the capture rate of existing cleaner to ultra-fine flying dust is relatively low, about there is the flying dust of 1% to enter air, form the major part of atmospheric aerosol.
The sulfur oxide contamination of China is serious, and electric power and coal are the main industries causing acid rain and sulfur dioxide pollution.
Recirculating fluidized bed (CFB) be in recent years in the world fast-developing get up efficient, the low stain clean-burning technology of a new generation, its main feature is that fuel and desulfurizing agent are through repeatedly circulating, carry out low-temperature burning and desulphurization reaction repeatedly, in stove, turbulent motion is strong, not only can reach the efficiency of combustion that the desulfuration efficiency of 90%, low NOx, discharge are close with coal-powder boiler, and have that fuel tolerance is wide, load adjustment ability good, lime-ash is easy to the features such as comprehensive utilization.
At present, the application of China's CFBB is more and more extensive, and CFBC is famous with clean and effective, but the PM of its discharge
2.5can not ignore, and existing desulfurization efficiency of circulating fluidized bed boiler does not reach best, the SO of escape
2and the gas such as NOx can form sulfate in an atmosphere or nitrate becomes PM
2.5form source.
For recirculating fluidized bed (CFB), due to the cause of sulfate product blocking hole, cause the CaO of granule interior cannot be participated in reaction by closely knit product layer parcel; For the sorbent particle that particle diameter is less, although the little particle of particle diameter has larger specific area, be conducive to gas-solid desulphurization reaction in stove, granule is difficult to separated device and catches and be separated, and shorter residing time in furnace cannot make desulfurizing agent obtain to make full use of; These limitation result in the calcium utilization lower (20% ~ 45%) of CFBB, and desulfurizing agent namely over half does not participate in desulphurization reaction.And be not easy to be captured due to granule, cause dust collector efficiency low.
Steam phase transforming know-why is: in supersaturated vapor environment, and steam is that the nuclei of condensation undergo phase transition with subparticle, and grain graininess increases, and coalescence phenomenon occurs in the collision that simultaneously contacts with each other between particle, and subparticle particle diameter and quality are all enlarged markedly.
Summary of the invention
The object of this invention is to provide a kind of cooperation-removal PM
2.5and the system of desulfurization.
Another object of the present invention is to provide a kind of cooperation-removal PM
2.5and the circulating fluidized bed system of desulfurization.
Another object of the present invention is also to provide a kind of cooperation-removal PM
2.5and the method for desulfurization.
Another object of the present invention is also said method to be used in recirculating fluidized bed.
A kind of cooperation-removal PM
2.5and the system of desulfurization, comprise the high-pressure atomization water humidifying device be connected with exhanst gas outlet, wherein humidifying device is connected successively with demister, deduster.
Wherein, the cooperation-removal PM of said system
2.5and sweetening process is: enter high-pressure atomization water humidifying device from the flue gas of exhanst gas outlet, on the one hand, steam reaches capacity and with PM
2.5particulate is that the nuclei of condensation undergo phase transition, thus makes PM
2.5particle size increases, and produces diffusion and warm-up movement simultaneously, and impel the mutual making contact condensation of dust-laden particle to go forward side by side a step-length greatly, the dust-laden drop after growing up catches by demister, and removes PM with demister
2.5(such as, flushing water rinses and removes), part dust-laden drop enters deduster, removes PM further by deduster
2.5; On the other hand, through the high-pressure atomization Water spray of humidifying device, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed in flue gas and with the SO in flue gas
2or SO
3reaction generates CaSO
4, reduce SO
2discharge, also avoid oxysulfide and form PM further
2.5.
Recirculating fluidized bed (CFB) system of a kind of cooperation-removal PM2.5 and desulfurization, comprise burner hearth, wherein, burner hearth, cyclone separator, air preheater, high-pressure atomization water humidifying device, demister, deduster are connected successively, and material returning device is connected with burner hearth and cyclone separator respectively.
Wherein, the cooperation-removal PM of said system
2.5and sweetening process is: coal dust is in burner hearth combustion, the flue gas generated enters cyclone separator through burner hearth, large particulate matter is back to burner hearth by cyclone separator separation through material returning device and burns away, finely ground particle substance passes through air preheater after cyclone separator, enter high-pressure atomization water humidifying device again, on the one hand, steam reaches capacity and with PM
2.5particulate is that the nuclei of condensation undergo phase transition, thus makes PM
2.5particle size increases, and produces diffusion and warm-up movement simultaneously, and impel the mutual making contact condensation of dust-laden particle to go forward side by side a step-length greatly, the dust-laden drop after growing up catches by demister, and removes PM with demister
2.5(such as, flushing water rinses and removes), part dust-laden drop enters deduster, removes PM further by deduster
2.5; On the other hand, through the high-pressure atomization Water spray of humidifying device, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed in flue gas and with the SO in flue gas
2or SO
3reaction generates CaSO
4, reduce SO
2discharge, also avoid oxysulfide and form PM further
2.5.
Preferred cooperation-removal PM further
2.5and the circulating fluidized bed system of desulfurization, be also included between cyclone separator and air preheater and be also provided with back-end surfaces, for reducing exhaust gas temperature, reduce thermal pollution, save fuel, improve the thermal efficiency.This preferred system, the difference of cooperation-removal PM2.5 and sweetening process and said process is, finely ground particle substance enters back-end surfaces after cyclone separator, then by entering high-pressure atomization water humidifying device after air preheater.
A kind of cooperation-removal PM
2.5and the method for desulfurization, comprising:
(1) desulfurizing agent adopt calcium carbonate, flue gas through high-pressure atomization water humidifying device high-pressure atomization humidification after, PM
2.5there is condensation growth; The CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed and with the SO in flue gas
2or SO
3reaction generates CaSO
4;
(2) PM grown up
2.5particle enters demister, is caught and remove by demister, and part dust-laden drop enters deduster and removes PM further
2.5, CaSO
4removed by demister and deduster.
Further, the high pressure of above-mentioned high-pressure atomization is preferably 0.5-1MPa, PM
2.5removal efficiency and again desulfuration efficiency are better.
The preferred use amount of above-mentioned desulfurizing agent is Ca/S mass ratio is 2 ~ 3.
Amount of humidification in above-mentioned humidifying device is preferably H
2o/Ca quality is 20 ~ 30 than scope.
After above-mentioned humidification, flue-gas temperature ranges preferably from 108 ~ 121 DEG C.
Preferably, the water added in above-mentioned humidifying device is for containing 1% ~ 2%H
2o
2the aqueous solution of mass percent concentration, is preferably 2%H
2o
2.
In said method, preferred flue-gas temperature higher than more than flue gas acid dew point temperature 10-15 degree to ensure that deduster normally runs.
Said method may be used in recirculating fluidized bed (CFB) for cooperation-removal PM
2.5and desulfurization.
The invention provides a kind of cooperation-removal PM
2.5and the system of desulfurization, removing PM
2.5while, by humidification, can also desulfurization again, improve the service efficiency of desulfurizing agent, improve the utilization rate of desulfurization Ca, confirm through test, native system can realize PM
2.5remove, desulfuration efficiency reaches more than 50% again.
Existing CFB system, although desulfuration efficiency is pretty good, but do not reach best, in addition sulfate product blocking hole, causes the CaO of granule interior cannot be participated in reaction, for the sorbent particle that particle diameter is less by closely knit product layer parcel, although the particle that particle diameter is little has larger specific area, be conducive to gas-solid desulphurization reaction in stove, but granule is difficult to separated device seizure separation, shorter residing time in furnace cannot make desulfurizing agent acquisition make full use of; These limitation result in the calcium utilization lower (20%-45%) of CFBB, and desulfurizing agent namely over half does not participate in desulphurization reaction.And be not easy to be captured due to granule, cause dust collector efficiency low.
For above problem, CFB system of the present invention, mainly through spraying into lime stone to realize its sweetening process, desulfuration efficiency is higher, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed and with the SO in flue gas
2or SO
3reaction generates CaSO
4, reduce SO
2discharge, avoid oxysulfide and form PM further
2.5, improve the utilization rate of desulfurization Ca.Pass through high pressure, desulfurizing agent use amount, amount of humidification, add H
2o
2isoparametric optimization, desulfuration efficiency reaches more than 50% again.
CFB system of the present invention, its main PM
2.5source comprises the molecule and SO that are formed in coal combustion process
2, NOx reacts the aerosol generated.When the steam in flue gas reaches capacity state, just can be that the nuclei of condensation undergo phase transition with molecule, thus particle size is increased, produce diffusion and warm-up movement simultaneously, impel a condense step-length of going forward side by side of the mutual making contact of dust-laden particle large, dust-laden drop after growing up catches by demister, and part dust-laden drop removes, for PM easily via the deduster of routine
2.5remove good effect.Through the optimization to native system pressure and other parameters, PM can be realized
2.5remove.
Accordingly, cooperation-removal PM of the present invention
2.5and the method for desulfurization, removing PM
2.5while, by humidification, can also desulfurization again, improve the service efficiency of desulfurizing agent, improve the utilization rate of desulfurization Ca, confirm through test, this method can realize PM
2.5remove, desulfuration efficiency reaches more than 50% again, greatly reduces atmosphere pollution.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of the system of embodiment 1.
Fig. 2 is the structural representation of the system of embodiment 2.
Fig. 3 is the desulfurized effect curve map of different initial Ca/S mass ratio.
Fig. 4 is different H
2the desulfurized effect curve map of O/Ca mass ratio.
Fig. 5 adopts different H
2o
2the desulfurized effect curve map of the aqueous solution of mass percent concentration.
Wherein, 1-burner hearth, 2-cyclone separator, 3-material returning device, 4-back-end surfaces, 5-air preheater, 6-high-pressure atomization water humidifying device, 7-demister, 8-deduster.
Detailed description of the invention
All features disclosed in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this description (comprising any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
The system of embodiment 1 one kinds of cooperation-removal PM2.5 and desulfurization and result of use
Be illustrated in figure 1 the cooperation-removal PM2.5 of the present embodiment and the system of desulfurization, comprise the high-pressure atomization water humidifying device 6 be connected with exhanst gas outlet, humidifying device 6 is connected with demister 7, demister 7 is connected with deduster 8.After entering humidifying device 6 from the flue gas of exhanst gas outlet, enter demister 7, then enter deduster 8 by demister 7, discharge.
The cooperation-removal PM of system described in the present embodiment
2.5and sweetening process is: enter high-pressure atomization water humidifying device from the flue gas of exhanst gas outlet, on the one hand, steam reaches capacity and with PM
2.5particulate is that the nuclei of condensation undergo phase transition, thus makes PM
2.5particle size increase, produces diffusion and warm-up movement simultaneously, and impel the mutual making contact condensation of dust-laden particle to go forward side by side a step-length greatly, the dust-laden drop after growing up catches by demister, and removes PM with the flushing of mist eliminator flushing water
2.5, part dust-laden drop enters deduster, removes PM further by deduster
2.5; On the other hand, through the high-pressure atomization Water spray of humidifying device, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed in flue gas and with the SO in flue gas
2or SO
3reaction generates CaSO
4, reduce SO
2discharge, also avoid oxysulfide and form PM further
2.5.
The circulating fluidized bed system of embodiment 2 one kinds of cooperation-removal PM2.5 and desulfurization and result of use
Be illustrated in figure 2 the cooperation-removal PM2.5 of the present embodiment and the circulating fluidized bed system of desulfurization, comprise burner hearth 1, wherein, burner hearth 1 is connected with cyclone separator 2, and cyclone separator 2 is connected with material returning device 3, and material returning device 3 is connected with burner hearth 1 again; Cyclone separator is also connected successively with back-end surfaces 4, air preheater 5, high-pressure atomization water humidifying device 6, demister 7, deduster 8.
Wherein, the cooperation-removal PM of the present embodiment system
2.5and sweetening process is: coal dust is in burner hearth combustion, the flue gas generated enters cyclone separator through burner hearth, large particulate matter is back to burner hearth by cyclone separator separation through material returning device and burns away, finely ground particle substance enters back-end surfaces after cyclone separator, then by entering high-pressure atomization water humidifying device after air preheater.On the one hand, steam reaches capacity and with PM
2.5particulate is that the nuclei of condensation undergo phase transition, thus makes PM
2.5particle size increase, produces diffusion and warm-up movement simultaneously, and impel the mutual making contact condensation of dust-laden particle to go forward side by side a step-length greatly, the dust-laden drop after growing up catches by demister, and removes PM with the flushing water flushing of demister
2.5, part dust-laden drop enters deduster, removes PM further by deduster
2.5; On the other hand, through the high-pressure atomization Water spray of humidifying device, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed in flue gas and with the SO in flue gas
2or SO
3reaction generates CaSO
4, demister and deduster are by CaSO
4remove, reduce SO
2discharge, also avoid oxysulfide and form PM further
2.5.
Embodiment 3
A kind of cooperation-removal PM
2.5and the method for desulfurization, step is as follows:
(1) flue gas (passes through 2%H through high-pressure atomization water humidifying device high-pressure atomization humidification
2o
2the atomized water solution humidification of mass percent), after humidification, PM
2.5there is condensation growth; Desulfurizing agent adopts calcium carbonate, the CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed and with the SO in flue gas
2or SO
3reaction generates CaSO
4, the use amount of calcium carbonate is initial Ca/S mass ratio is 2.5, and the high-pressure atomization amount of humidification of humidifying device is H
2o/Ca quality is 25 than scope;
(2) after humidification, flue-gas temperature is 115 DEG C, the PM grown up
2.5particle enters demister, is caught and remove by demister, and part dust-laden drop enters deduster and removes PM further
2.5; Demister and deduster are by CaSO
4remove.
The initial Ca/S mass ratio of embodiment 4 removes PM to desulfurizing agent
2.5the impact of effect
The method of the device of embodiment 2 and embodiment 3 is utilized to carry out removing test, test arranges 3 processed group, and basic experimental conditions is all consistent with embodiment 3, unlike, the initial Ca/S mass ratio of processed group 1-3 is set to 1,2,3 respectively, and result as shown in Figure 3.
As can be seen from the result of Fig. 3, compared with processed group 1, the desulfurized effect of the initial Ca/S mass ratio of processed group 2 and processed group 3 is preferably.
Analyze:
Along with initial Ca/S is than increasing, desulfuration efficiency has very significantly to be increased, but crosses the waste that conference causes desulfurizing agent, influential system macroeconomic, and CFB should reach higher desulfuration efficiency in actual motion, increases again the wearing and tearing of heating surface not too much.
Embodiment 5H
2o/Ca is to desulfurization and remove PM
2.5the impact of effect
The method of the device of embodiment 2 and embodiment 3 is utilized to carry out removing test, test arranges 3 processed group and 1 control group, and all basic and embodiment 3 of the experiment condition of processed group and control group is consistent, unlike, control group is not humidified, the H of processed group 1
2o/Ca mass ratio is 10, the H of processed group 2
2o/Ca mass ratio is 20, the H of processed group 3
2o/Ca mass ratio is 30.The result of desulfurized effect as shown in Figure 4.
From the interpretation of result of Fig. 4, there is active remaining CaO, but substantially do not have desulphurizing ability under drying regime in the Desulphurization in recirculating fluidized bed (CFB) system, after its humidification, Desulphurization shows the ability of desulfurization again.And the H of humidification
2the result tool of O/Ca comparison desulfurization again has a certain impact, along with H
2the increase of O/Ca ratio, desulfurized effect also improves, but at H
2o/Ca mass ratio is increased to after 20, and desulfurized effect remains unchanged.
Embodiment 6H
2o
2to desulfurization with remove PM
2.5the impact of effect
Utilize the method for the device of embodiment 2 and embodiment 3 to carry out removing test, test arranges 4 groups, 3 processed group and 1 control group, and all basic and embodiment 3 of the experiment condition of processed group and control group is consistent, unlike, control group adds 0%H
2o
2the aqueous solution (that is: adding pure water), processed group 1 adds 0.5%H
2o
2the aqueous solution of mass percent concentration, processed group 2 adds 1%H
2o
2the aqueous solution of mass percent concentration, processed group 3 adds 2%H
2o
2the aqueous solution of mass percent concentration.The result of desulfurized effect as shown in Figure 5.
From the result of Fig. 5, hydrogen peroxide (H
2o
2) solution has impact to humidification desulfurization efficiency, due to hydrogen peroxide (H
2o
2) strong oxidizing property, along with hydrogen peroxide (H
2o
2) the increase desulfuration efficiency of solution concentration is also corresponding is increased, when adding the hydrogen peroxide (H of 1%-2%
2o
2), desulfurized effect will reach and to increase substantially and difference is little, industrial hydrogen peroxide (H in addition
2o
2) cheap, so add appropriate hydrogen peroxide (H
2o
2) strengthening tail flue gas humidification desulfurization has feasibility.
The present invention is not limited to aforesaid detailed description of the invention.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (9)
1. a cooperation-removal PM
2.5and the system of desulfurization, it is characterized in that, comprise the high-pressure atomization water humidifying device be connected with exhanst gas outlet, wherein humidifying device, demister, deduster connect successively, and the water added in described humidifying device is for containing mass percentage concentration 1%-2%H
2o
2the aqueous solution, described system is removing PM
2.5while realize desulfurization again, and desulfuration efficiency reaches more than 50% again.
2. a cooperation-removal PM
2.5and the CFB system of desulfurization, it is characterized in that, comprise burner hearth, wherein, burner hearth, cyclone separator, air preheater, high-pressure atomization water humidifying device, demister, deduster are connected successively, material returning device is connected with burner hearth and cyclone separator respectively, and the water added in described humidifying device is for containing mass percentage concentration 1%-2%H
2o
2the aqueous solution, described CFB system is removing PM
2.5while realize desulfurization again, and desulfuration efficiency reaches more than 50% again.
3. a kind of cooperation-removal PM as claimed in claim 2
2.5and the CFB system of desulfurization, it is characterized in that, between described cyclone separator and air preheater, be also provided with back-end surfaces.
4. a cooperation-removal PM
2.5and the method for desulfurization, it is characterized in that, comprising:
(1) desulfurizing agent adopt calcium carbonate, flue gas through high-pressure atomization water humidifying device high-pressure atomization humidification after, PM
2.5there is condensation growth; The CaSO of parcel CaO
4particle breaks after high-pressure atomization water, inner CaO exposed and with the SO in flue gas
2or SO
3reaction generates CaSO
4; The water added in described humidifying device is for containing mass percentage concentration 1%-2%H
2o
2the aqueous solution;
(2) PM grown up
2.5particle enters demister, is caught and remove by demister, and part dust-laden drop enters deduster and removes PM further
2.5, CaSO
4removed by demister and deduster,
Wherein, described method is removing PM
2.5while realize desulfurization again, and desulfuration efficiency reaches more than 50% again.
5. cooperation-removal PM as claimed in claim 4
2.5and the method for desulfurization, it is characterized in that, described high pressure is 0.5 ~ 1Mpa.
6. cooperation-removal PM as claimed in claim 4
2.5and the method for desulfurization, it is characterized in that, the use amount of described desulfurizing agent calcium carbonate is initial Ca/S mass ratio is 2 ~ 3.
7. cooperation-removal PM as claimed in claim 4
2.5and the method for desulfurization, it is characterized in that, the amount of humidification in described humidifying device is H
2o/Ca mass ratio is 20 ~ 30.
8. cooperation-removal PM as claimed in claim 4
2.5and the method for desulfurization, it is characterized in that, the flue-gas temperature after described humidification is: 108 ~ 121 DEG C.
9. cooperation-removal PM as claimed in claim 4
2.5and the method for desulfurization, it is characterized in that, the water added in described humidifying device is for containing mass percentage concentration 2%H
2o
2the aqueous solution.
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| 湿法脱硫中应用蒸汽相变原理协同脱除PM2.5的技术分析;杨林军，张霞，孙露娟，张宇，颜金培，沈湘林;《现代化工》;20071120;第27卷(第11期);第23-26页 * |
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| CN103697488A (en) | 2014-04-02 |
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