CN104941435B - A kind of semidry-method recirculating fluidized bed flue gas desulphurization system of normal temperature and method - Google Patents
A kind of semidry-method recirculating fluidized bed flue gas desulphurization system of normal temperature and method Download PDFInfo
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- CN104941435B CN104941435B CN201510346165.9A CN201510346165A CN104941435B CN 104941435 B CN104941435 B CN 104941435B CN 201510346165 A CN201510346165 A CN 201510346165A CN 104941435 B CN104941435 B CN 104941435B
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Abstract
A kind of semidry-method recirculating fluidized bed flue gas desulphurization system of normal temperature and method, are related to a kind of sulfureous in flue gas oxide removal method and system of combustion apparatus discharge.The present invention is using recirculating fluidized bed as desulfurization reactor, it is characterized in that the slurries containing ultra-fine desulfurizer particle are sprayed into circulating fluid bed reactor, recycle stock particle is added in circulating fluid bed reactor simultaneously, make circulating fluid bed reactor interior circulation material particles and the abundant making contact of desulfurizer slurry, and desulphurization reaction occurs.The achievable desulfurizing agent of the present invention prepares with desulphurization reaction PROCESS COUPLING and significantly improves the purpose of sorbent utilization.Compared with existing Summary of Semi-dry Flue Gas Desulfurization, the present invention has the advantages that desulfuration efficiency is high, system architecture is simple, investment and operation and maintenance cost are low, can be used for the gas cleaning process of Industrial Boiler and station boiler.
Description
Technical field
The present invention relates to the purifier and method of a kind of combustion apparatus flue gas, more particularly to a kind of normal temperature semidry method circulation
Fluid bed flue gas desulfurization system and method, belongs to flue gases purification field.
Background technology
A large amount of pollutants (oxysulfide, nitrogen oxides and dust etc.) that combustion apparatus is produced to atmospheric environment and
Human body health produces significant damage.The pollutant removing problem of coal combustion equipment has been subjected to the great attention of the whole society.Entirely
Increased trend is still showed clearly ball Coal-fired capacity year by year, but every country constantly makes stricter Abgasgesetz
To realize the control of total emission volumn.For all coal-burning utilities, or more acute pollution reduction will be faced
Input.
Up to the present, in coal-fired Industrial Boiler and station boiler, more than 90% uses Wet Flue Gas Desulfurization Technology,
Its desulfuration efficiency is up to 95%.Wet Flue Gas Desulfurization Technique due to needing larger fund input and water consumption higher, at some
The area of economics of underdevelopment, shortage of water resources, its application is very restricted.In the exploitation of low water consumption desulfurization technology, half
Dry flue gas desulphurization technology is one of desulfurization technology conventional at present, such as Chinese patent literature CN1307926A and
CN102350205A.Patent CN1307926A provides a kind of dry cyclic suspension bed fume desulfurizing process and system, its feature
It is to prepare absorbent after mixing outside cyclic suspension bed reactor using dry lime, deduster flying dust and water, is then added to
In cyclic suspension bed reactor, and inside and outside separator is employed to realize reducing the purpose of SR.Patent document
CN102350205A proposes a kind of normal temperature purification of flue gases by semidry process method and system, using recirculating fluidized bed as desulphurization reaction
Device, with fast hydrating desulfurizing agent as absorbent, electrostatic precipitator is combined as particulate matter control device using dry and wet.Both of the aforesaid
Patent of invention employs the less composite absorber of moisture content as desulfurizing agent, and desulfurizing agent is prepared outside desulfurization reactor specially
Carried out in door gear, and aqueous water is sprayed into circulating fluid bed reactor to promote normal temperature desulphurization reaction, be capable of achieving high-efficiency desulfurization
Purpose.
In view of system flow and complex structure band existing for the existing semidry-method recirculating fluidized bed flue gas desulfurization technique of normal temperature
The high investment for coming and operating cost problem high, and the low problem of removal efficiency, develop efficient, Low investment and operation and maintenance cost
Low desulfurization technology is still the striving direction of numerous environmentalists.
The content of the invention
The purpose of the present invention is to realize that a kind of system architecture is simple, the semidry-method recirculating fluidized bed flue gas of normal temperature of high-efficiency desulfurization
Desulphurization system and method.
The purpose of the present invention is achieved by the following technical solution：
A kind of semidry-method recirculating fluidized bed flue gas desulphurization system of normal temperature, it is characterised in that：The system includes ciculation fluidized
Bed reactor and desulfurizer slurry are prepared and induction system；The circulating fluid bed reactor include tedge, cyclone separator,
Recycle stock adding apparatus and nozzle；The desulfurizer slurry prepare with induction system include quick lime storehouse, metering control,
Slurrying pond, filler pipe, slurries filter and slurries pump；The quick lime storehouse successively with metering control, slurrying pond, slurries mistake
Filter, slurries pump are connected with nozzle, arrangement of nozzles in the emulsion zone of tedge, the material outlet of recycle stock adding apparatus with
Tedge is connected.
The described semidry-method recirculating fluidized bed fume desulphurization method of a kind of normal temperature, it is characterised in that the method includes following step
Suddenly：
1) lump lime that particle diameter is 1~100mm is added in slurrying pond, to addition in slurrying pond and block lime
The mol ratio of middle CaO is 5：1~20：1 water, keeps slurrying pond static condition 5~30 minutes, block lime is fully entered with water
Row reaction, is made the slurries containing small sorbent particle；
2) the recycle stock particle that particle diameter is 50~1000 μm is fed through in circulating fluid bed reactor, and participates in circulation
The Matter Transfer process of fluidized-bed reactor, recycle stock particle is solid particle of the fusing point higher than 200 DEG C；
3) flue gas enters in circulating fluid bed reactor from bottom of the tube is risen, and the slurries in slurrying pond filter out bulky grain
Afterwards, slurries are fed through in circulating fluid bed reactor by slurries pump, by being arranged in circulating fluid bed reactor tedge
Interior nozzle is sprayed into the flue gas of circulating fluid bed reactor, the recycle stock particle volume share of nozzle outlet area for 5~
30%, make the drop after nozzle atomization and the abundant making contact of recycle stock particle；
4) the flue gas carrying recycle stock particle from tedge top out enters cyclone separator, and most of particle is divided
From collection, it is re-fed into continuing to participate in cyclic process and desulphurization reaction in tedge, the particle not separated and collected is discharged with flue gas
Circulating fluid bed reactor.
A kind of described semidry-method recirculating fluidized bed fume desulphurization method of normal temperature, it is characterised in that：The recycle stock
Grain addition is 1 with the mass ratio of contained calcium hydroxide in the slurries sprayed into tedge:10~3：1.
A kind of described semidry-method recirculating fluidized bed fume desulphurization method of normal temperature, it is characterised in that：The recycle stock
Grain is using coal particle, coke granule, coal ash particle, metallurgical slag particle, polytetrafluoroethylgranule granule, ceramic particle, biomass
The mixture of one or more in grain, sand and zeolite granular.
The present invention compared with prior art, with advantages below and beneficial effect：1. desulfurization is prepared using lump lime
Agent slurries, because quick lime and water reaction are exothermic reaction, help for product-calcium hydroxide to be broken into average grain diameter and are
The molecule of micron dimension, is effectively increased the surface area of desulfurizing agent, so as to realize efficient in circulating fluid bed reactor
Using purpose.2. recycle stock particle is added in circulating fluid bed reactor, helps to be taken off containing small by what nozzle was added
The slurries of sulphur agent particle merge with high concentration recycle stock particles collision, and desulfurizing agent is covered in recycle stock particle surface, due to
Recycle stock grain diameter is larger, can be obviously prolonged sorbent particle residence time in circulating fluid bed reactor, reduces thin
The amount that small sorbent particle can not be trapped and escaped by cyclone separator, further improves the desulfurizing agent profit of semi-dry process flue gas desulphurization
With rate.3. for individually whitewashing Summary of Semi-dry Flue Gas Desulfurization, the fluidization process that the recycle stock of addition is formed,
Sorbent particle in Strong dispersion tedge can be played a part of, effectively reduced by in-bed desulfurization agent skewness is made
Into smoke SO 2 escape problem, make system have desulfurized effect higher.4. compared to the desulfurization prepared outside desulfurization reactor
It is for agent (such as fast hydrating desulfurizing agent class), the slurries containing fine sorbent particle are anti-in desulfurization with recycle stock particle
Answer in device and be sufficiently mixed, realize droplet formation in semi-dry desulphurization reactor and prepared and course of reaction with holding, desulfurizing agent
Coupling, simplifies desulfurizing agent and adds and preparation process, reduces investment and the operation and maintenance cost of system.5. due to recycle stock
Particle is larger with the recycle stock particle size that slurries are formed, and is to be capable of achieving separation using commercial cyclone, compared to existing
The semi-dry process flue gas desulphurization system of some use electrostatic precipitations and bag-type dust, with the simple clear superiority of system architecture.
In a word, it is of the invention compared with existing Summary of Semi-dry Flue Gas Desulfurization, with desulfuration efficiency is high, system architecture simple,
Investment and the relatively low advantage of operation and maintenance cost, can be used for the gas cleaning process of Industrial Boiler and station boiler.
Brief description of the drawings
The structural representation of the semidry-method recirculating fluidized bed flue gas desulphurization system embodiment of normal temperature that Fig. 1 is provided for the present invention.
In figure：1- tedges；2- cyclone separators；3- recycle stock adding apparatus；4- quick limes storehouse；5- measure controls are filled
Put；6- stirring pools；7- filler pipes；8- slurries filters；9- slurries pumps；10- nozzles.
Specific embodiment
Principle of the invention, structure and the course of work are further illustrated below in conjunction with the accompanying drawings.
The structural representation of the semidry-method recirculating fluidized bed flue gas desulphurization system embodiment of normal temperature that Fig. 1 is provided for the present invention.
The system includes that circulating fluid bed reactor and desulfurizer slurry are prepared and induction system；The circulating fluid bed reactor bag
Include tedge 1, cyclone separator 2, recycle stock adding apparatus 3 and nozzle 10；The desulfurizer slurry is prepared and induction system
Including quick lime storehouse 4, metering control 5, slurrying pond 6, filler pipe 7, slurries filter 8 and slurries pump 9；The quick lime storehouse
4 are connected with metering control 5, slurrying pond 6, slurries filter 8, slurries pump 9 and nozzle 10 successively, and nozzle 10 is arranged in rising
In the emulsion zone of pipe 1, the material outlet of recycle stock adding apparatus 3 is connected with tedge 1.
The course of work of the invention is as follows：
1) lump lime that particle diameter is 1~100mm is added in slurrying pond, to addition in slurrying pond and block lime
The mol ratio of middle CaO is 5：1~20：1 water, keeps slurrying pond static condition 5~30 minutes, block lime is fully entered with water
Row reaction, is made the slurries containing small sorbent particle；
2) the recycle stock particle that particle diameter is 50~1000 μm is fed through in circulating fluid bed reactor, and participates in circulation
The Matter Transfer process of fluidized-bed reactor, recycle stock particle is solid particle of the fusing point higher than 200 DEG C；
3) flue gas enters in circulating fluid bed reactor from bottom of the tube is risen, and the slurries in slurrying pond filter out bulky grain
Afterwards, slurries are fed through in circulating fluid bed reactor by slurries pump, by being arranged in circulating fluid bed reactor tedge
Interior nozzle is sprayed into the flue gas of circulating fluid bed reactor, the recycle stock particle volume share of nozzle outlet area for 5~
30%, make the drop after nozzle atomization and the abundant making contact of recycle stock particle；
4) the flue gas carrying recycle stock particle from tedge top out enters cyclone separator, and most of particle is divided
From collection, it is re-fed into continuing to participate in cyclic process and desulphurization reaction in tedge, the particle not separated and collected is discharged with flue gas
Circulating fluid bed reactor.
In operation, the import and export pressure drop of circulating fluid bed reactor tedge is chosen for 500~5000Pa, specific pressure drop choosing
Take main according to SO in flue gas2Content determines.The addition of recycle stock particle runs pressure drop according to circulating fluid bed reactor
Chosen, it is therefore an objective to ensure that reactor runs on stable pressure drop operating mode, its addition sprays into the slurry in tedge with nozzle
The mass ratio of contained calcium hydroxide is 1 in liquid:10~3：1.Recycle stock particle can use particle diameter for 50~1000 μm of coal
Particle, coke granule, coal ash particle, metallurgical slag particle, polytetrafluoroethylgranule granule, ceramic particle, biological particles, sand or
The mixture of one or more in zeolite granular etc..
Operation principle of the present invention：
Desulfurizer slurry is prepared using the lump lime that particle diameter is 1~100mm, because quick lime and water reaction are heat release
Reaction, contributes to product-calcium hydroxide Ca (OH)2(it is micro- that average grain diameter is about 4 for micron dimension to be broken into average grain diameter
Rice) molecule, increased the reaction surface area of desulfurizing agent, realize desulfurizing agent efficiently utilize purpose.If the raw stone for using
When grey particle diameter is less than the present invention, quick lime reacts institute's liberated heat and does not concentrate with water, it is difficult to form tiny micron order desulfurization
Agent particle；If the quick lime particle diameter for using is more than the present invention, the problem that preparation time can be caused long.Due to the particle for containing
Particle diameter is smaller, using the standby slurries of patent system of the present invention, it is not easy to deposit, the blocking of slurries conveyance conduit can be avoided to ask
Topic, it is ensured that system stable operation.
Add the recycle stock particle that particle diameter is 50~1000 μm in circulating fluid bed reactor, and added by nozzle
Slurry droplet collision containing small sorbent particle merges, and desulfurizer slurry is covered in recycle stock particle surface, due to following
Ring material particles particle diameter is larger, can be efficiently separated by regular industrial cyclone separator, by extension sorbent particle ciculation fluidized
Residence time in bed reactor, the escape amount of tiny sorbent particle is reduced, improve sorbent utilization.If the circulation for adding
When material particles particle diameter is less than patent of the present invention, then it is difficult to be separated by existing conventional cyclones；If the recycle for adding
When material grain diameter is higher than patent of the present invention, then the particle needs wind speed higher just to can guarantee that cyclic process, increases system resistance
Power.
The fluidization process that the recycle stock of addition is formed, may also operate as sorbent particle in Strong dispersion tedge
Effect, effectively reduce due to the flue gas SO caused by in-bed desulfurization agent skewness2Escape problem, has system higher
Desulfurized effect.
By the slurries containing fine sorbent particle with recycle stock particle in circulating fluid bed reactor endoparticle volume
Share is abundant collisional mixing in 5~30% regions, is capable of achieving droplet formation in tedge and is prepared with holding, desulfurizing agent and reaction
The coupling of process, for the desulfurizing agent prepared outside circulating fluid bed reactor (such as fast hydrating desulfurizing agent class),
Simplify desulfurizing agent to add and preparation process, reduce investment and the operation and maintenance cost of system.In practical application, when penetrating position
When putting regions particulate volume share less than the present invention, slurry droplet is relatively low with the probability of recycle stock particles collision, easily causes
A large amount of sorbent particles can not be carried by recycle stock particle so that sorbent utilization reduction；When particle volume share is higher than
When of the invention, because local circulation material particles are excessively dense, slurries are difficult to be dispersed, and can produce larger de- of more particle diameters
Sulphur agent slurries so that the Ca (OH) of preparation2Particle is larger, is unfavorable for the SOx of its internal unreacted desulfurizing agent composition and outside
React, also cause sorbent utilization to reduce.
Claims (3)
1. the semidry-method recirculating fluidized bed fume desulphurization method of a kind of normal temperature, it is characterised in that the method is included using desulphurization system
Circulating fluid bed reactor and desulfurizer slurry are prepared and induction system；The circulating fluid bed reactor include tedge (1),
Cyclone separator (2), recycle stock adding apparatus (3) and nozzle (10)；Prepared by the desulfurizer slurry include with induction system
Quick lime storehouse (4), metering control (5), slurrying pond (6), filler pipe (7), slurries filter (8) and slurries pump (9)；It is described
Quick lime storehouse (4) successively with metering control (5), slurrying pond (6), slurries filter (8), slurries pump (9) and nozzle (10)
It is connected, nozzle (10) is arranged in the emulsion zone of tedge (1), the material outlet and tedge of recycle stock adding apparatus (3)
(1) connect；
Methods described comprises the following steps：
1) lump lime that particle diameter is 1~100mm is added in slurrying pond, in addition in slurrying pond and block lime
The mol ratio of CaO is 5：1~20：1 water, keeps slurrying pond static condition 5~30 minutes, block lime is fully carried out with water
Reaction, is made the slurries containing small sorbent particle；
2) the recycle stock particle that particle diameter is 50~1000 μm is fed through in circulating fluid bed reactor, and participates in ciculation fluidized
The Matter Transfer process of bed reactor, recycle stock particle is solid particle of the fusing point higher than 200 DEG C；
3) flue gas enters in circulating fluid bed reactor from bottom of the tube is risen, and after the slurries in slurrying pond filter out bulky grain, leads to
Cross slurries pump slurries are fed through in circulating fluid bed reactor, by the spray being arranged in circulating fluid bed reactor tedge
Mouth is sprayed into the flue gas of circulating fluid bed reactor, and the recycle stock particle volume share of nozzle outlet area is 5~30%, is made
Drop and the abundant making contact of recycle stock particle after nozzle atomization；
4) the flue gas carrying recycle stock particle from tedge top out enters cyclone separator, and most of particle is separated to be received
Collection, is re-fed into continuing to participate in cyclic process and desulphurization reaction in tedge, and the particle not separated and collected is discharged with flue gas and circulated
Fluidized-bed reactor.
2. a kind of semidry-method recirculating fluidized bed fume desulphurization method of normal temperature as claimed in claim 1, it is characterised in that：It is described to follow
Ring material particles addition is 1 with the mass ratio of contained calcium hydroxide in the slurries sprayed into tedge:10~3：1.
3. a kind of semidry-method recirculating fluidized bed fume desulphurization method of normal temperature as claimed in claim 1 or 2, it is characterised in that：Institute
Recycle stock particle is stated using coal particle, coke granule, coal ash particle, metallurgical slag particle, polytetrafluoroethylgranule granule, ceramics
The mixture of one or more in grain, biological particles, sand and zeolite granular.
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| CN108686489B (en) * | 2017-04-12 | 2021-01-01 | 北京华石联合能源科技发展有限公司 | Suspension bed wet desulphurization process |
| CN109365472B (en) * | 2018-09-30 | 2020-12-15 | 清华大学 | Cleaning treatment method for solid waste |
| CN112058049A (en) * | 2020-09-16 | 2020-12-11 | 广东佳德环保科技有限公司 | Flue gas desulfurization and denitrification system device and method adopting ozone oxidation and semidry method |
| CN112044345A (en) * | 2020-09-22 | 2020-12-08 | 马鞍山奥柯环保科技发展有限公司 | Novel SDA desulfurizing tower bed charge cyclic utilization system |
| CN112221340B (en) * | 2020-10-20 | 2021-09-14 | 威海市正大环保设备股份有限公司 | Integrated method for desulfurizing and dedusting by humidifying circulation semidry method outside tower |
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| CN1231286C (en) * | 2001-04-28 | 2005-12-14 | 清华大学 | A circulating fluidized bed process for cleaning fume by adding iron ash and its equipment |
| CN100425329C (en) * | 2005-11-25 | 2008-10-15 | 山东大学 | Tech. for desulphuni zation of flue-gas by using integrated internal circulation and two-speed fluidized bed |
| CN103453522B (en) * | 2013-08-22 | 2016-05-18 | 清华大学 | A kind of desulphurization system of circulating fluidized bed boiler and method |
| CN103712207B (en) * | 2013-12-26 | 2016-08-17 | 清华大学 | A kind of CFBB half dry type desulphurization system and method |
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