CN1239234C - Circulation fluidized dry flue gas desulfurizing process by adopting mixed feeding mode - Google Patents
Circulation fluidized dry flue gas desulfurizing process by adopting mixed feeding mode Download PDFInfo
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- CN1239234C CN1239234C CN 03125322 CN03125322A CN1239234C CN 1239234 C CN1239234 C CN 1239234C CN 03125322 CN03125322 CN 03125322 CN 03125322 A CN03125322 A CN 03125322A CN 1239234 C CN1239234 C CN 1239234C
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Abstract
The present invention discloses a circulation fluidization dry process flue gas desulfurization technology which adopts a mixed feeding method and especially aims at a material feeding method in the circulation fluidization dry process flue gas desulfurization system. The fresh feeding of the desulphurization reaction system and the digestion reaction system are respectively merged with respective recirculation feed back, namely that the initial feeding and the systemic circulation materials are mixed by a mixed feeding method, and put in a reaction tower, disseminated winds are arranged in the position of a mixed inlet orifice to further ensure the evenness of the materials in the reaction tower, and meet the concentration distribution characteristics required by the desulphurization chemical reaction during adjustment and operation of the system so as to improve the space utilization rate of the reaction tower, and the method is favorable to improve the desulphurization efficiency or the digestive efficiency; because the mixed feeding method is adopted, the input quantity of a single inlet orifice is improved, simultaneously the single material inlet is saved, and the mixed feeding method is favorable to the arrangement of the desulphurization system and large scale of devices.
Description
Technical field
The present invention relates to a kind of dry flue gas desulphurization technology of mixed feeding mode, belong to the flue gas desulfurization technique field, dry method desulfuration system and technology in the particularly various combustion apparatus discharging flue gases.
Background technology
Present improvement to sulfur dioxide, external general main employing wet type lime stone-gypsum method (W-FGD), adopt said method, though removal effect is better, investment is huge, water consumption is big but it exists, floor space is big, system complex, big, the complex structure of resistance, and need handle or the like a series of problems again to water.Compared following advantage with conventional wet process: investment cost is low; Desulfurization product is a dry state; Need not to install demister and smoke re-heater; Equipment is not perishable; Be difficult for taking place fouling and obstruction.Therefore dry method high-efficiency flue gas desulfurization technology becomes the emphasis of domestic and international research.
Those skilled in the art is fully aware of, in dry flue gas desulphurization technology, the turbulent mass transfer characteristic of its reaction temperature, humidity, sorbent particle surface-active, desulfurizing agent and flue gas haptoreaction time, sorbent particle and flue gas, the desulfurizing agent degree etc. that is evenly distributed in reactor is the principal element that influences the desulfurization by dry method desulfuration efficiency; Desulphurization system is in service, and other conditions are all definite usually, and then be evenly distributed in the reactor turbulent mass transfer characteristic of degree and sorbent particle and flue gas of desulfurizing agent plays conclusive effect to the efficient of system.
Flue gas circulating fluidized bed desulfurization by dry method for present application, mostly utilize postdigestive lime (slurry) as absorbent, the material of separating with absorbent and external separator is as the circulation fluidized bed material, is used for removing pernicious gas in the flue gas by strong gas-solid liquid three-phase in fluid bed reacting tower.This is on the one hand owing to adopt the lime white system, not only technological process complexity, and floor space is big, and mortar transports easy fouling of pipeline and obstruction, and the mortar nozzle weares and teares easily, and the operation and maintenance cost that has increased system is used.
At these problems, relate to those skilled in the art over past ten years and proposed many new dry method desulfuration systems and technology, as the open book CN1307926A of Chinese invention patent, the material that it mixes formation by a certain percentage with quick lime (CaO) and flue gas flying dust and water adopts fixed nozzle that it is sent into and carries out desulphurization reaction in the fluid bed reacting tower as desulfurizing agent.And present being seen dry flue gas desulphurization technology does not realize that from layout, performance and structural design how to organize feed, feed back the higher desulfuration reaction efficiency furthers investigate, and has only played the effect of desulfurizing agent being delivered to desulfurizing tower.
No matter be digestion reaction or calcium hydroxide desulfurizing tower in the desulphurization reaction of quick lime (CaO) in the digestion tower, on the one hand require sorbent particle and flue gas to have strong turbulent mass transfer characteristic, need again on the other hand fully to mix between material and the gas that material, material and participation are reacted.Otherwise, the local gas reaction substrate concentration concentration high low (or opposite) at the solid reaction substrate concentration, this situation will be in case appearance will directly influence reaction efficiency.
In addition, when the increase along with single tower smoke treatment amount, the layout of the feed entrance point of tower body can be more and more nervous.
Summary of the invention
Deficiency and defective at the prior art existence, purpose of the present invention and task provide a kind of dry flue gas desulphurization system of novel employing mixed feeding mode, and the characteristics of this system are the dry method desulfuration systems that together enters reaction tower in conveyance conduit after the solid reactant that enters reaction tower is mixed again.Adopt the mode of this mixed feeding can make system debugging and assurance material in service in reaction tower uniformity or satisfy the CONCENTRATION DISTRIBUTION characteristic of desulfurization chemical reaction needs, reach the purpose of raising desulfuration efficiency (more than 90%～92%).
Concrete technical scheme:
Adopt the circulating fluidization dry flue gas desulphurization technology of mixed feeding mode, comprise digestion reaction system, desulfurization reaction tower and the desulphurization reaction system of desulfurizing agent preparation, the separation and the recirculating system of outside sorbent particle, the fresh material feed pipe of desulphurization reaction system and/or digestion reaction system is merged before going into tower with separately recirculation feed back pipe respectively, be about to send in the reaction tower after initial feed and the systemic circulation mixing of materials.
The circulating fluidization dry flue gas desulphurization technology of described employing mixed feeding mode, its digestion reaction system adopts the circulating fluidization reaction process, to send in the reaction tower after initial feed and the systemic circulation mixing of materials, promptly in digestion reaction system, merge outside tower with desulfurizing agent raw material feed pipe and through the outlet of digestion tower and by the isolated recycle stock recirculation pipe of digestive system separator, send into the digestion reaction tower by a feed nozzle.
The circulating fluidization dry flue gas desulphurization technology of described employing mixed feeding mode, in the desulphurization reaction system, fresh desulfurizing agent is transported Guan Yujing desulfurizing tower outlet and outside tower, merge, send into desulfurization reaction tower by a feed nozzle by the recirculation pipe of the isolated recycle stock of separator of desulphurization reaction system.
In digestion reaction system, separator adopts two-stage.
In digestion reaction system, the mixed feeding nozzle is in the bottom of digestion reaction tower, and fluidizing gas sprays into from the fluidisation air inlet of digestion tower bottom.
The location arrangements of above-mentioned mixed feeding nozzle is sent out wind apparatus.
Above-mentioned mixed feeding nozzle can be at its axial stretching.
Above-mentioned mixed feeding nozzle is downward-sloping, and it is axial and horizontal direction is adjustable 5～60 ° of angular regions.
The circulating fluidization dry flue gas desulphurization technology of described employing mixed feeding mode, the feed nozzle arrangement of desulfurization reaction tower mixed feeding mouth is in reaction tower bottom fluidization regions.
The circulating fluidization dry flue gas desulphurization technology of described employing mixed feeding mode, be furnished with the combination smoke jet nozzle at the middle part of desulfurization reaction tower, nozzle is downward-sloping, it is axially adjustable 5～60 ° of angular regions with horizontal direction, and the cleaning after outside deduster separation of 10-30% contains wet flue gas and sprays in the desulfurizing tower with the flow velocity of 30-180m/s and recycle.
Advantage of the present invention:
At first, the present invention makes material more even in tower because the mixed feeding mode feeds material, has improved the reaction tower space availability ratio, helps the raising of desulfurization or digestive efficiency;
Secondly, the present invention adopts the mode of mixed feeding not only can save arrangement space, also can arrange in the import bottom of mixed feeding mouth simultaneously and send out wind, further improves its charging uniformity;
The 3rd, owing to adopt the mixed feeding mode, the inlet amount of single charging aperture is improved, and has saved independent material inlet simultaneously, helps the maximization of arranging and installing.
Description of drawings
Accompanying drawing 2 is for adopting the digestion reaction Tower System schematic diagram of mixed feeding mode.
Accompanying drawing 3 for adopt the mixed feeding mode the desulfurization reaction tower system schematic.
Among the figure: quick lime storehouse 1; Digestion reaction tower 2; Digestive system primary separator 3; Digestive system second-stage separator 4; Desulfurization reaction tower 5; Desulfurization reaction tower bottom fluidisation area 5-1; Desulphurization reaction system separators 6; Cinder tank 7; Main induced draft fan 8; Chimney 9; Feed pipe 10; Digestion tower atomizing spray 11; Digestion tower fluidisation air inlet 12; Digestive system material recirculation pipe 13; Digestion tower blast pipe 14; Digestive system one-level separation off gas pipe 15; Digestive system secondary separation off gas pipe (the weary gas fairlead of separator) 16; Desulfurizing agent transports pipe 17; Desulfurizing tower give water atomizing nozzle 18; Desulfurizing tower gas approach 19; Desulfurizing tower smoke outlet tube 20; Desulfurizing tower material recirculation pipe 21; Desulphurization reaction system dust removing device exhanst gas outlet 22; Lime-ash pipe 23; Flue gas mixing-chamber 24; Desulfurizing tower flue gas induction apparatus 25; Combination smoke jet 26; Desulfurization reaction tower mixed feeding nozzle 27; . digestion reaction tower mixed feeding nozzle 28.
The specific embodiment
Specify embodiments of the present invention, technical process and system layout structure below in conjunction with accompanying drawing:
As Fig. 1: the present invention includes digestion reaction system, desulfurization reaction tower and the desulphurization reaction system of desulfurizing agent preparation, the separation and the recirculating system of outside sorbent particle.
In digestion reaction system, with desulfurizing agent raw material feed pipe 10 with behind the digestion tower, outside tower, merge by the recirculation pipe 13 of digestive system separator 3 isolated recycle stocks, send into digestion reaction tower 2 by a feed nozzle 28.The 1st, desulfurizing agent raw material quick lime storehouse.In digestion reaction system, separator adopts two-stage 3 and 4.Digest tower atomizing spray 11, digestion tower fluidisation air inlet 12, digestion tower blast pipe 14, digestive system one-level separation off gas pipe 15, digestive system secondary separation off gas pipe (the weary gas fairlead of separator) 16 and desulfurizing agent in addition and transport pipe 17.
As Fig. 3: in the desulphurization reaction system, fresh desulfurizing agent is transported pipe 17 and merges outside tower through desulfurizing tower 5 outlet and by the recirculation pipe 21 of the separator 6 isolated recycle stocks of desulphurization reaction system, send into desulfurization reaction tower 5 by a feed nozzle 27.What system comprised desulfurizing tower gives water atomizing nozzle 18, desulfurizing tower gas approach 19, desulfurizing tower smoke outlet tube 20, desulphurization reaction system dust removing device exhanst gas outlet 22, main induced draft fan 8, chimney 9, lime-ash pipe 23, cinder tank 7, flue gas mixing-chamber 24, desulfurization reaction tower bottom fluidisation area 5-1, desulfurizing tower flue gas induction apparatus 25, combination smoke jet 26.
Desulfurizing agent raw materials of Ca O powder is mixed through the recycle stock of feed pipe 10 with 13 loopbacks of material circulation pipe by quick lime storehouse 1, together sent into the bottom of digestion reaction tower 2 by mixed feeding nozzle 28, fluidizing gas sprays into and material is carried out fluidisation at the digestion tower bottom by 12.Water sprays in the tower after atomizing through 11, keeps the tower inner bottom part that suitable humidity and fluidized state are arranged.Because digestion reaction is exothermic reaction, under fluidization, reaction will cause quicklime particles to be broken, and become the high activity hydrated lime particle of small particle diameter, high-specific surface area, the most grain diameters that arrive the outlet of digestion top of tower are the dry state material between 1-30 μ m.The dusty gas that the digestion tower is discharged at first enters in the primary separator 3 of digestive system and carries out gas solid separation, and the recirculation particle that wherein is separated is transmitted back to the digestion tower and carries out digestion reaction through transporting pipe 13; The dusty gas of discharging from the primary dust removing device enters second-stage separator 4, the bottom that separated desulfurizing agent process conveying pipe 17 that gets off and nozzle 27 spray into desulfurization reaction tower 5, remainder is sent in the main flue gas inlet pipeline 19 with cyclone separator top blast pipe 16.
Flue gas enters flue gas mixing-chamber 24, the bottom fluidisation area 5-1 that enters desulfurization reaction tower by desulfurizing tower flue gas induction apparatus 25 carries out fluidisation to reaction mass, after the digestion mixing of materials of desulfurizing agent through conveying pipe 17 and 21 loopbacks of desulfurizing tower material recirculation pipe, together spray into desulfurization reaction tower by mixed feeding nozzle 27, this nozzle 27 is the swing adjustable nozzle, and send out wind in the nozzle arranged around, the size of regulating nozzle angle, position and sending out wind can satisfy sorbent particle distribution character arbitrarily.
Flue gas, sorbent particle and with mix by the 18 atomizing cooling waters that spray into, strong three-phase turbulent heat transfer mass transfer exchange takes place in the three.The cigarette temperature drop also can be in about 80 ℃ operations of cigarette temperature under some situation to 55-70 ℃ ask (be higher than the interior flue gas dew point temperature of tower 5-15 ℃ between) in the above-mentioned tower, and the sorbent particle overwhelming majority is Ca (OH)
2, most of particle diameter is between 1-7 μ m.Flue gas, particle water, sorbent particle and recirculation particle move upward under the drive of flue gas jet like this, are the fluidized suspension attitude in the whole desulfurizing tower.In the tower body middle and upper part, substantially present bigger falling trend, most of particle is followed the usual practice and is moved downward near the wall, and moved upward reciprocal by the flue gas drive again to the tower bottom, in tower, form high-intensity three-phase turbulent flow swap status, the complicated physical and chemical process of strong mixing, heat transfer, mass transfer and chemical reaction takes place.SO2 in tower in the flue gas and desulfurizing agent Ca (OH)
2Reaction generates calcium sulfite or calcium sulfate, and can deviate from a spot of SO in the flue gas simultaneously
3And pernicious gas compositions such as the HCl that may exist, HF, desulfuration efficiency can reach more than 90% at least.
Middle part at desulfurization reaction tower 5, layout is introduced the combination smoke jet of desulfurizing tower through clean flue gas recirculating system 26 pipelines, cleaning after the desulfurization is contained wet flue gas to be sent into and carries out flue gas recirculation in the fluidization desulfurizing tower, to form the high intensity turbulent mixed zone at desulfurizing tower middle part, strengthen the intensity of total desulphurization reaction.The clean flue gas up to standard that comes out from the smoke separator 6 of desulphurization system is by clean flue gas recirculation pipe 26, pass through downwards at combination smoke jet one-sided or that both sides are arranged at the middle part of desulfurization reaction tower 5, flow velocity with 80-120m/s sprays in the desulfurizing tower, to guarantee that strong three-phase turbulent heat transfer mass transfer exchange takes place between sorbent particle, atomizing cooling water and this three of jet flue gas to be mixed.Simultaneously, because the water capacity of flue gas recycled itself is higher than normal dry air, reduced required injection flow rate in the desulfurization reaction tower to a certain extent.
Flue gas is drawn by the outlet conduit 20 at desulfurizing tower top, enters by (or sack cleaner) in the electrostatic separator 6, and the particle that carries in the flue gas is separated, and wherein also contains some unreacted sorbent particle.In order to improve sorbent utilization,, their recirculation is sent back in the desulfurizing tower by a recirculation particle feed back pipe 21; Desulfuration byproduct that does not circulate and flying dust are then sent into cinder tank and are stored, transport; Send into chimney 9 from the clean flue gas part up to standard that deduster 6 comes out by main induced draft fan 8, enter atmosphere at last.
Claims (10)
1. circulating fluidization dry flue gas desulphurization technology that adopts the mixed feeding mode, comprise the interior desulphurization reaction of digestion reaction, desulfurization reaction tower of desulfurizing agent preparation, the separation and the recirculation of outside sorbent particle, it is characterized in that: the fresh material feed pipe of desulphurization reaction system and/or digestion reaction system is merged before going into tower with separately recirculation feed back pipe respectively, be about to send in the reaction tower after initial feed and the systemic circulation mixing of materials.
2. the circulating fluidization dry flue gas desulphurization technology of employing mixed feeding mode according to claim 1, it is characterized in that: digestion reaction system also adopts the circulating fluidization reaction process, to send in the reaction tower after initial feed and the systemic circulation mixing of materials, promptly in digestion reaction system, merge outside tower with desulfurizing agent raw material feed pipe and through the outlet of digestion tower and by the isolated material recirculation pipe of digestive system separator, send into the digestion reaction tower by a feed nozzle.
3, the circulating fluidization dry flue gas desulphurization technology of employing mixed feeding mode according to claim 1, it is characterized in that: in the desulphurization reaction system, fresh desulfurizing agent is transported Guan Yujing desulfurizing tower outlet and outside tower, merge, send into desulfurization reaction tower by a feed nozzle by the recirculation pipe of the isolated recycle stock of separator of desulphurization reaction system.
4. the circulating fluidization dry flue gas desulphurization technology of employing mixed feeding mode according to claim 1 and 2 is characterized in that: in digestion reaction system, separator adopts two-stage.
5. the circulating fluidization dry flue gas desulphurization technology of employing mixed feeding mode according to claim 1 and 2, it is characterized in that: in digestion reaction system, the mixed feeding nozzle is in the bottom of digestion reaction tower, and fluidizing gas sprays into from the fluidisation air inlet of digestion tower bottom.
6. according to the circulating fluidization dry flue gas desulphurization technology of claim 2 or 3 described employing mixed feeding modes, it is characterized in that: the mixed feeding nozzle can be at its axial stretching.
7. according to the circulating fluidization dry flue gas desulphurization technology of claim 2 or 3 described employing mixed feeding modes, it is characterized in that: the mixed feeding nozzle is downward-sloping, and it is axial and horizontal direction is adjustable 5～60 ° of angular regions.
8. according to the circulating fluidization dry flue gas desulphurization technology of claim 2 or 3 described employing mixed feeding modes, it is characterized in that: be furnished with at the mixed feeding nozzle location and send out wind apparatus.
9. according to the circulating fluidization dry flue gas desulphurization technology of claim 1 or 3 described employing mixed feeding modes, it is characterized in that: the mixed feeding arrangement of nozzles of desulfurization reaction tower is in reaction tower bottom fluidization regions.
10. the circulating fluidization dry flue gas desulphurization technology of employing mixed feeding mode according to claim 1, it is characterized in that: be furnished with the combination smoke jet nozzle at the middle part of desulfurization reaction tower, nozzle is downward-sloping, it is axially adjustable 5～60 ° of angular regions with horizontal direction, and the cleaning after outside deduster separation of 10-30% contains wet flue gas and sprays in the desulfurizing tower with the flow velocity of 30-180m/s and recycle.
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| CN 03125322 CN1239234C (en) | 2003-08-25 | 2003-08-25 | Circulation fluidized dry flue gas desulfurizing process by adopting mixed feeding mode |
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| CN1239234C true CN1239234C (en) | 2006-02-01 |
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| CN104740991B (en) * | 2015-03-19 | 2017-10-24 | 沈阳化工大学 | A kind of method of coal-fired flue-gas wet dedusting desulfurization |
| CN109126404A (en) * | 2018-10-10 | 2019-01-04 | 江苏海澜正和环境科技有限公司 | A kind of dry-process deacidification system using sodium bicarbonate as reactant |
| CN113332851B (en) * | 2021-02-24 | 2023-08-29 | 薛援 | Dry flue gas desulfurization method for moving bed |
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