CN109110846A - A kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique - Google Patents
A kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique Download PDFInfo
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- CN109110846A CN109110846A CN201810957696.5A CN201810957696A CN109110846A CN 109110846 A CN109110846 A CN 109110846A CN 201810957696 A CN201810957696 A CN 201810957696A CN 109110846 A CN109110846 A CN 109110846A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
Abstract
The invention belongs to field of industrial waste water treatment, more particularly to decrement and cement fixed system and technique is concentrated in a kind of desulfurization wastewater flue gas, the system includes electric precipitator, flue gas concentration tower is sequentially connected after the electric precipitator, desulfurizing tower and chimney, it is connected between electric precipitator and desulfurizing tower by flue collector, the smoke inlet of the flue gas concentration tower and outlet are connected to by two laterals with flue collector respectively；The desulfurization tower bottom connects dewatering system, and dewatering system liquid outlet is connected to desulfurization wastewater liquid reserve tank, and desulfurization wastewater liquid reserve tank is connected in the concentrate of flue gas concentration tower；The flue gas concentration tower is connected to concentrated water case, and the concentrated water case is connected to mixing machine inlet, and the slurry mixture of the mixing and blending machine enters in molding equipment, and molding equipment is followed by fog room.The technique is suitable for above system, and the present invention is stablized using low-temperature flue gas concentration decrement, solidified body performance, and pollutant is solidified in desulfurization wastewater, is effectively reduced desulfurization wastewater secondary pollution, is truly realized the zero-emission of desulfurization wastewater.
Description
Technical field
The invention belongs to field of industrial waste water treatment more particularly to a kind of desulfurization wastewater flue gas concentration decrement and cementization are solid
Determine system and technique, is primarily adapted for use in the power plant using wet desulphurization.
Background technique
Wet desulfurization of flue gas by limestone-gypsum method mature technology, it is stable and easy to maintain, and desulfuration efficiency is super
Height is current most widely used desulfurization technology.In order to guarantee stable operation and the desulfuration efficiency of desulphurization system, by circulation desulfurization
Chlorine ion concentration control needs regular efflux wastewater in 12000-20000mg/L, desulphurization system in slurries.Desulfurization wastewater is as electricity
Factory's terminal waste water, not only water quality is complicated, has high faintly acid, suspension content, COD and contents of heavy metal elements is exceeded and chlorine
The features such as salinities such as salt sulfate are higher, and water is larger, pollutant removing system, lime stone product before burning coal, desulfurizing tower
Matter and desulphurization system operating condition etc. can all generate different degrees of influence to its water quality and water.Just because of desulfurization wastewater
This complicated condition of water quality and more influence factor characteristics, processing difficulty be much larger than commonly industrial wastewater.
In April, 2015, State Council issue " water pollution action plan ", emphasize the improvement for reinforcing water environment；In June, 2017,
" the thermal power plant's prevention and cure of pollution possible technique guide " of Chinese Ministry of Environmental Protection's publication formally comes into effect, wherein being explicitly emphasized that realization waste water is close
The key of zero-emission is to realize desulfurization wastewater zero-emission.With the propulsion of national policy, the improvement of desulfurization wastewater becomes industry heat
Point.For the difficulty of desulfurization wastewater processing, researchers at home and abroad develop various method for treating desulfurized wastewater.It is common at present
Method for treating desulfurized wastewater mainly include conventional chemical treatment techniques, evaporation pond processing, flue evaporation, evaporative crystallization and side
Road evaporation etc..Traditional chemical treatment method can remove most of heavy metal ion and suspension in desulfurization wastewater by three headers
Object, but not can be removed the stronger soluble organic fraction of the migration based on chloride ion；Evaporation pond processing cost is lower, but it is handled
Effect is limited larger by wind speed, waste strength and water body environment, and there are windage loss, big to surrounding environment influence；Flue
There is the case where can not being evaporated completely in evaporation technique, can cause to corrode to flue, and the technology considerably increases the pressure of deduster
Power；The Chinese patent of Patent No. CN201610522598 discloses a kind of wet desulphurization wastewater zero emission treatment method, by three
Header water outlet passes sequentially through membrane pretreatment, second level nanofiltration membrane, high pressure reverse osmosis membrane and evaporation crystallization equipment, by chloride point
It separates out individually to crystallize, sulfate reuse desulphurization system is discharged with gypsum, reduces a large amount of softening dosing expenses.This kind of evaporation knot
Crystal technique efficiently divides salt to realize, requires to elongate crystallization pre-treating technology, either embrane method or agent-feeding treatment, all significantly
Operating cost is increased, and the salt after crystallization is difficult to handle；The Chinese patent of Patent No. CN201710942060 discloses one
Kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and method, by extracting before air preheater middle low temperature after high temperature and air preheater respectively
Flue gas is as heat source, and in ad hoc spray drying tower, evaporation uniformly mixes the desulfurization wastewater mist drop after a small amount of Ca (OH) 2,
And installing small-sized pre-duster additional after spray drying tower, the substances such as salt after collection is dry in flue gas do not influence flyash
Comprehensive utilization.It is empty that middle low-temperature flue gas after this bypass evaporation technique extraction air preheater makes up single extraction as supplemental heat source
Influence of the high-temperature flue gas to boiler efficiency before pre- device, is easier to be received by power plant, but unavoidably still will affect boiler efficiency,
The dangerous waste of generation is difficult to handle, and there are the insoluble problems of pressure drop for small-size dust remover.
Subtract on quantifier elimination for desulfurization wastewater, the Chinese patent of Patent No. CN201710240967 discloses a kind of de-
Sulphur waste water fume afterheat is concentrated abatement system and its technique, in the flue before desulfurizing tower, using spray equipment by desulfurization wastewater
Atomization is droplet, is evaporated concentration to desulfurization wastewater using hot fume in flue.In Patent No. 201710379789
A kind of wet desulphurization waste water reclaiming processing system of state's patent disclosure and its processing method, pretreatment system are specially arranged dense
Contracting tower, hot fume before extraction section desulfurizing tower, is evaporated concentration with the desulfurization wastewater droplet after spraying layer.Both the above
Method is all utilized the hot fume before desulfurizing tower and is evaporated concentration to desulfurization wastewater, and all using spraying layer to desulfurization wastewater into
Row atomization is to improve concentrated effect.But the former is directly concentrated in flue, big in fixed flue since flue gas flow rate is larger
Partial desulfurization waste water can directly be blown into desulfurizing tower by flue gas, and gas-liquid contact time is extremely short, and concentrated effect is difficult to realize；The latter exists
Desulfurization wastewater is handled without three headers before being concentrated, and demister is arranged above spraying layer, the high suspended matter content in desulfurization wastewater
And high calcium content of magnesium is easy to cause demister fouling blockage serious.
To sum up, limited to desulfurization wastewater concentration reduced training in above each technology, and method for subsequent processing only will migration
The strong chloride ion of property is transferred in electric precipitator or crystal salt, and there are secondary pollution hidden danger, need to develop at new desulfurization wastewater
Science and engineering skill.
Summary of the invention
For this reason, it may be necessary to provide the new desulfurization wastewater flue gas concentration decrement of one kind and cement fixed system and technique, this is
System and technique can efficiently utilize power plant's energy and physical resources, avoid secondary pollution, play the effect of energy-saving and water-saving.
To achieve the above object, the present invention provides a kind of desulfurization wastewater flue gases, and decrement and cement fixed system is concentrated,
It includes flue gas concentration tower and connecting pipe that abatement system, which is concentrated, in flue gas, and flue gas concentration tower, desulfurizing tower are sequentially connected after electric precipitator
And chimney, it is connected between electric precipitator and desulfurizing tower by flue collector, flue gas concentration tower bypass arrangement, the flue gas concentration tower
Smoke inlet and outlet are connected to by two laterals with flue collector respectively；
The desulfurization tower bottom connects conventional dewatering system, and dewatering system liquid outlet is connected to desulfurization wastewater liquid reserve tank,
Desulfurization wastewater liquid reserve tank accesses in the concentrate of flue gas concentration tower；
Cement fixed system includes concentrated water case, mixing and blending machine, molding equipment, fog room, and the flue gas concentration tower connects
It is connected to concentrated water case, the concentrated water case is connected to mixing machine inlet, and the slurry mixture of the mixing and blending machine enters into
In type equipment, molding equipment is followed by fog room.
Further, two laterals are respectively the first lateral and second branched pipe road, and the first lateral is
Smoke inlet pipelines, the first lateral end are connected to flue gas concentration tower, and second branched pipe road is exhanst gas outlet pipeline, and second
Lateral end still connects in the flue collector between electric precipitator and desulfurizing tower, and close to desulfurizing tower one end.
Further, the first gas baffle is respectively set in described point of the first lateral and second branched pipe road entrance
With the second gas baffle, flue gas disengaging is controlled, high pressure blower is equipped in the first lateral, after high pressure blower extracts electric precipitator
Flue gas enters flue gas concentration tower, and pumping ratio is 10%-15%.
Further, air-introduced machine is equipped in the flue collector between the electric precipitator and desulfurizing tower.
Further, the desulfurization wastewater liquid reserve tank is connected to the dense of flue gas concentration tower by water pump and raw water water inlet line
In contracting liquid.
Further, the flue gas concentration tower is concentrated water pump 14 by bottom and is connected to concentrated water case, the concentrated water case water outlet
End is equipped with mass flow and controls equipment, and the mass flow control equipment enters the dense of mixing and blending machine according to fixed mixing ratio control
Water quality.
Further, liquid level or more is concentrated in the flue gas concentration tower and arranges lance system, first lateral
End is placed between concentration liquid level and lance system, the cloth agitating device in the flue gas concentration tower lateral condensation liquid, concentration
Liquid is connected to lance system by water circulating pump, the cycle heat exchange in flue gas concentration tower.
Further, the concentrated water case is equipped with pH detecting instrument and white lime water medicine system, pH detecting instrument are used for
Concentrated water pH is detected, white lime water is added when concentrated water pH is less than 4 and adjusts concentrated water pH to 4.0-7.0.
Further, the fog room keeps constant temperature and humidity, and at 20 ± 3 DEG C, relative humidity is controlled for temperature control
In 60%-80%, if standard curing condition can not be provided, should at least be furnished with sprinkler and drying equipment in fog room.
The present invention also provides a kind of desulfurization wastewater flue gas concentration decrement and cement technique for fixing, are suitable for above-mentioned system
System, comprising:
Step 1: the neat stress after electric precipitator dedusting enters flue collector, the flue gas of 85%-90% by air-introduced machine
It is directly entered desulfurizing tower, by based Wet Process Flue Gas, after the accumulation of slurries chlorine ion concentration reaches threshold limit value, it is fixed to need
Amount discharge desulfurization slurry, desulfurization slurry obtain gypsum and desulfurization wastewater after dewatering system is dehydrated, and desulfurization wastewater is stored in de-
In sulphur waste water liquid reserve tank；
Step 2: the raw water in desulfurization wastewater liquid reserve tank enters the dense of flue gas concentration tower by water pump and raw water water inlet line
In contracting liquid；In flue collector flue gas by high pressure blower extract 10%-15% enter the first lateral, by second branched pipe road into
Entering flue gas concentration tower, exchanges heat with the fluid column of concentrate, the partial moisture after heat exchange in desulfurization wastewater is evaporated to vapor, with
Flue gas after heat exchange enters flue collector through the second branch pipe(tube) of flue gas concentration tower top part, enters back into desulfurizing tower；
Step 3: the concentrate in flue gas concentration tower is transported to lance system through water circulating pump, follows in flue gas concentration tower
Ring heat exchange is discharged into concentrated water case by the way that water pump is concentrated, the pH detecting instrument in concentrated water case when concentrate reaches design concentration rate
Concentrated water pH is detected, if concentrated water pH less than 4, need to be added appropriate white lime water by white lime water medicine system and be adjusted to concentrated water pH
4.0-7.0, after pH is normal, the mass flow of dense tank outlet control equipment is according to institute's water requirement in solidified body match ratio to mixed
It closes in blender and quantitatively exports concentrated water, the cementitious materials such as cement, flyash are added into mixing agitator by feeding machine, start
All raw material is mixed in mixing and blending machine；
Step 4: the slurry mixture formed after in time stirring mixing agitator is transferred in molding equipment, to slurry
After forming for 24 hours, solidified body is transferred to fog room, continues to conserve under certain temperature and humidity.
Further, the desulfurization wastewater concentration rate in the step 3 is controlled at 5-10 times.
Further, the solidified body quality mixture ratio in the step 3 is cement: flyash: concentration waste water: river sand=3
~6:1:2~4:3~6.5.
It is different from the prior art, above-mentioned technical proposal has the advantages that
(1) the present invention provides a kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique, setting is special
With flue gas concentration tower, in flue gas concentration tower using electric precipitator after fume afterheat and desulfurization wastewater carry out mass-and heat-transfer, reach
The effect of desulfurization wastewater concentration decrement, is made full use of to residual heat of electric power plant resource.
(2) lance system is set in flue gas concentration tower, is exchanged heat using the fluid column and hot fume of formation, greatly improves heat exchange
Efficiency reduces nozzle choking problems caused by spraying layer setting, can also be to lance system shape in desulfurization wastewater fluid column dropping process
At flushing effect.
(3) desulfurization wastewater original water part moisture is evaporated to vapor during with hot fume mass-and heat-transfer, with cooling
Flue gas enters desulphurization system afterwards, and water capacity increases, and the technique supplement water of desulphurization system can be greatly reduced, reach water-saving work
With.
(4) it using the salinity and heavy metal ion in cement solidification desulfurization wastewater, converts the desulfurization wastewater of mobility to
Physical and chemical performance is stablized, and the solidified body of disperse is not easy, and after 28d curing age, compressive strength of solidified body is soaked in 32MPa or more
Extracting rate is lower than 20%, and the stronger chloride ion of migration is fixed in solidified body, effectively avoids secondary pollution.
(5) replace part of cement to fix high-salt wastewater using the flyash in power plant, solidification effect on the one hand can be improved
Fruit enhances the crystallized ability to chloride ion, is on the other hand also beneficial to power plant and rationally disposes flyash, make full use of power plant's by-product
Product.
(6) the configuration of the present invention is simple, investment and operating cost are low, distinct economic can be brought for enterprise, and have good
Good environment and social benefit.
Detailed description of the invention
Fig. 1 is the system structure diagram of the embodiment of the present invention.
Description of symbols:
1. deduster, 2. air-introduced machines, 3. gas baffles, 4. high pressure blowers, 5. gas baffles, 6. desulfurizing towers, 7. chimneys, 8.
Dewatering system, 9., 10. desulfurization wastewater liquid reserve tanks, 11. water pumps, 12. flue gas concentration towers, 13. flue gas concentration towers, 14. condensed waters
Pump, 15. concentrated water casees, 16. fog rooms, 17. molding equipments, 18. fog rooms, 19. flue collectors, 20. first laterals, 21. the
Two laterals, 22. pipelines, 23. raw water water inlet lines.
Specific embodiment
Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality
It applies example and attached drawing is cooperated to be explained in detail.
Referring to Fig. 1, a kind of desulfurization wastewater flue gas concentration decrement and cement fixed system of the present embodiment, including electricity remove
Dirt device 1, flue gas concentration tower 13, desulfurizing tower 6, mixing and blending machine 13 and fog room 16；
Flue gas concentration tower 13, desulfurizing tower 6, chimney 7 are sequentially connected after electric precipitator 1；The electric precipitator 1 and desulfurizing tower 6
Between flue collector 19 in be equipped with air-introduced machine 2, flue collector 19 connects two laterals after air-introduced machine 2, wherein the first branched pipe
Road 20 is smoke inlet pipelines, and 20 end of the first lateral is connected to flue gas concentration tower 13, and second branched pipe road 21 is flue gas
Outlet conduit, 21 end of second branched pipe road still connect in the flue collector 19 between electric precipitator 1 and desulfurizing tower 6, and close de-
6 one end of sulphur tower；Gas baffle 3 and gas baffle is respectively set in first lateral 20 and 21 entrance of second branched pipe road
5, control flue gas passes in and out, and high pressure blower 4 is equipped in the first lateral 20, and flue gas enters flue gas concentration after extracting electric precipitator 1
Tower 13, pumping ratio are 10%-15%.
6 bottom of desulfurizing tower connects dewatering system 8, and liquid outlet is connected to desulfurization wastewater liquid reserve tank 10, desulfurization wastewater storage
It is connected in the concentrate of flue gas concentration tower 13 after liquid case 10 by water pump 11 and raw water water inlet line 23；
Flue gas concentration tower 13 is concentrated water pump 14 by bottom and is connected to concentrated water case 15, is concentrated in the flue gas concentration tower 13
More than liquid level arrange lance system, 20 end of the first lateral is placed between concentration liquid level and lance system；Described
Cloth agitating device in 13 lateral condensation liquid of flue gas concentration tower, concentrate is connected to lance system by water circulating pump 12, in cigarette
Cycle heat exchange in gas concentration tower 12.
15 water outlet of concentrated water case is equipped with mass flow and controls equipment, enters mixing and blending machine 16 according to fixed mixing ratio control
Concentrated water quality；The concentrated water case 15 is equipped with pH detecting instrument and white lime water medicine system, and pH detecting instrument is dense for detecting
Water pH is added white lime water when concentrated water pH is less than 4 and adjusts concentrated water pH to 4.0-7.0；Concentrated water case 15 is connected to mixing and blending machine
16 feed inlets, 16 bottom of mixing and blending machine are equipped with valve, control slurry mixture in mixing and blending machine 16 and enter molding equipment 17
In, molding equipment 17 is followed by fog room 18；The fog room 18 need to keep constant temperature and humidity, and temperature degree is controlled 20 ± 3
DEG C, relative humidity is controlled in 60%-80%, at least should be equipped with watering in fog room 18 if can not provide standard curing condition
Equipment and drying equipment；
A kind of desulfurization wastewater flue gas concentration decrement and cement technique for fixing is also disclosed in the present embodiment, which is suitable for upper
System is stated, which includes following procedure:
Step 1: the neat stress after 1 dedusting of electric precipitator enters flue collector 19 by air-introduced machine 2,85%-90%'s
Flue gas is directly entered desulfurizing tower 6, by based Wet Process Flue Gas, after the accumulation of slurries chlorine ion concentration reaches threshold limit value,
Quantitative discharge desulfurization slurry is needed, desulfurization slurry obtains gypsum 9 and desulfurization wastewater, desulfurization wastewater after the dehydration of dewatering system 8
It is stored in desulfurization wastewater liquid reserve tank 10；
Step 2: the raw water in desulfurization wastewater liquid reserve tank 10 enters flue gas by water pump 11 and raw water water inlet line 23 and is concentrated
In the concentrate of tower 13；Flue gas extracts 10%-15% into the first lateral 20 by high pressure blower 4 in flue collector 19, passes through
First lateral 20 enters flue gas concentration tower 13, exchanges heat with the fluid column of concentrate, the part after heat exchange in desulfurization wastewater
Moisture is evaporated to vapor, enters flue collector through 13 top second branched pipe road 21 of flue gas concentration tower with the flue gas after heat exchange, then
Into desulfurizing tower 6；
Step 3: the concentrate in flue gas concentration tower 13 is transported to lance system through water circulating pump 12, in flue gas concentration tower
Cycle heat exchange in 13 is discharged into concentrated water case 15 by the way that water pump 14 is concentrated, in concentrated water case 15 when concentrate reaches design concentration rate
PH detecting instrument detect concentrated water pH, if concentrated water pH less than 4, need to pass through white lime water medicine system appropriate white lime water is added will
Concentrated water pH is adjusted to 4.0-7.0, and after pH is normal, the mass flow control equipment that concentrated water case 15 exports is according to solidified body match ratio
Middle institute's water requirement quantitatively exports concentrated water into mixing agitator 16, and cement, powder are added into mixing agitator 16 by feeding machine
The raw material such as coal ash start mixing and blending machine 16, all raw material are mixed；Desulfurization wastewater in the step 3
Concentration rate need to be controlled at 5-10 times；Solidified body quality mixture ratio in the step 3 is cement: flyash: concentration waste water:
River sand=3~6:1:2~4:3~6.5；
Step 4: the slurry mixture formed after in time stirring mixing agitator 16 is transferred in molding equipment 17, to
Slurry is transferred to fog room 18 after forming for 24 hours, by solidified body, continues to conserve under certain temperature and humidity.
Desulfurization wastewater flue gas concentration decrement provided in this embodiment and cement fixed system and technique, main operational principle
It is that concentration is evaporated to desulfurization wastewater using low grade heat energy after deduster, using cementitious materials such as cement by the height after concentration
Brine waste is fixed up, and uses as construction materials such as curbs.In order to improve concentrated effect, it is dense that flue gas is especially arranged in system
Contracting tower, and concentrate is injected flue gas concentration tower using jet pipe and concentration water pump, forms water column, water column in ascent stage and
The water column of fall stage successively contacts hot fume twice, and the mean temperature difference and partial pressure difference in heat transfer process are larger, and gas-liquid two-phase connects
The touching time is longer, sufficiently carries out heat and mass convenient for hot fume and desulfurization wastewater, and heat utilization rate is higher, and the water column energy to fall
Good flushing effect is played to lance system.
Cement is current most widely used curing agent, has many advantages, such as high treating effect, low in cost, therefore selects water
Curing agent of the mud as desulfurization wastewater.Moisture in cement and desulfurization wastewater occurs hydration reaction and generates gel, and desulfurization can be given up
Heavy metal ion in water wraps up to a certain extent.Meanwhile in desulfurization wastewater the stronger chloride ion of migration in cement
It can be fixed.In fact, there are mainly three types of existing ways in cement system for chloride ion:
(1) it is chemically combined state chloride ion, the hydrated product tricalcium aluminate phase of cement is reacted with chloride ion generates low-solubility
Monochloro calcium aluminate 3CaOAl2O3·CaCl2·10H2O, also referred to as Fei Shi salt (Friedel salt)；
(2) physical absorption state chloride ion, chloride ion are adsorbed in the gel of calcium silicate after cement cementitious material aquation, trip
From chloride ion be fixed with this physical adsorption way.This physical adsorption way is mainly based upon double electrode layer theory,
The further diffusion that can prevent chloride ion, also can be such that free chloride ion settles out.But this physical absorption ability is that have
Limit, it needs to refine gap structure, can just make physical absorption more longlasting effectively；
(3) free state chloride ion, the free state chloride ion being present in Pore Solution, be only most influence solidification effect chlorine from
Son.One timing of chloride ion total amount, free chloro ion amount is fewer, and the ability to cure of cement system is stronger.
Free state chloride ion in cement system is reduced as far as possible, and the fixed efficiency of the technique can be improved.
In the present embodiment, solidified body quality proportioning is determined as cement: flyash: concentration waste water: river sand=5.5:1:
3.5:5.6 is uniformly placed on mold with other materials mix using the sodium chloride solution of different chlorine ion concentrations as water extracts
Middle molding is transferred in stable care environments is afterwards conserved for 24 hours, and the compression strength and leaching rate of solidified body are measured after 28d,
As a result as shown in the table:
Wherein, it is total that the solidified body after leaching rate is maintenance 28d impregnates the chloride ion leached after 7d in 300mL deionized water
The ratio of amount and chloride ion total amount in solidified body.
From general trend, with the increase of chlorine ion concentration, compressive strength of solidified body is overall not to be increased in lasting
Trend, the compression strength of solidified body increases with chlorine ion concentration and is increased when chlorine ion concentration is less than 70000mg/L,
Reach maximum value 44.62M Pa when 70000mg/L, subsequent compression strength increases with concentration and reduced.After solidified body conserves 28d
Leaching rate is respectively less than 16%, and minimum leaching rate is 10.78%.Since chlorine ion concentration is high in the high-salt wastewater after concentration, it is easy
Lead to reinforcement corrosion, influence the durability of armored concrete, therefore, the solidified body of this technique production is suitable for mass concrete
Or curb, the compression strength and leaching performance of solidified body can meet construction needs, be not easy to form secondary pollution.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or the terminal device that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or end
The intrinsic element of end equipment.In the absence of more restrictions, being limited by sentence " including ... " or " including ... "
Element, it is not excluded that there is also other elements in process, method, article or the terminal device for including the element.This
Outside, herein, " being greater than ", " being less than ", " being more than " etc. are interpreted as not including this number；" more than ", " following ", " within " etc. understand
Being includes this number.
Although the various embodiments described above are described, once a person skilled in the art knows basic wounds
The property made concept, then additional changes and modifications can be made to these embodiments, so the above description is only an embodiment of the present invention,
It is not intended to limit scope of patent protection of the invention, it is all to utilize equivalent structure made by description of the invention and accompanying drawing content
Or equivalent process transformation, being applied directly or indirectly in other relevant technical fields, similarly includes in patent of the invention
Within protection scope.
Claims (10)
1. a kind of desulfurization wastewater flue gas concentration decrement and cement fixed system, it is characterised in that: abatement system packet is concentrated in flue gas
Flue gas concentration tower and connecting pipe are included, is sequentially connected flue gas concentration tower, desulfurizing tower and chimney after electric precipitator, electric precipitator and de-
It is connected between sulphur tower by flue collector, flue gas concentration tower bypass arrangement, the smoke inlet and outlet difference of the flue gas concentration tower
It is connected to by two laterals with flue collector；
The desulfurization tower bottom connects conventional dewatering system, and dewatering system liquid outlet is connected to desulfurization wastewater liquid reserve tank, desulfurization
Waste water liquid reserve tank accesses in the concentrate of flue gas concentration tower；
Cement fixed system includes concentrated water case, mixing and blending machine, molding equipment, fog room, and the flue gas concentration tower is connected to
Concentrated water case, the concentrated water case are connected to mixing machine inlet, and the slurry mixture of the mixing and blending machine enters molding and sets
In standby, molding equipment is followed by fog room.
2. a kind of desulfurization wastewater flue gas concentration decrement according to claim 1 and cement fixed system, it is characterised in that:
Two laterals are respectively the first lateral and second branched pipe road, and the first lateral is smoke inlet pipelines, and first
Lateral end is connected to flue gas concentration tower, and second branched pipe road is exhanst gas outlet pipeline, and second branched pipe road end still connects
It connects in the flue collector between electric precipitator and desulfurizing tower, and close to desulfurizing tower one end.
3. a kind of desulfurization wastewater flue gas concentration decrement according to claim 2 and cement fixed system, it is characterised in that:
The first gas baffle and the second gas baffle is respectively set in first lateral and second branched pipe road entrance, controls cigarette
Gas passes in and out, and high pressure blower is equipped in the first lateral, partial fume enters flue gas concentration after high pressure blower extracts electric precipitator
Tower, pumping ratio are 10%-15%.
4. a kind of desulfurization wastewater flue gas concentration decrement according to claim 1 and cement fixed system, it is characterised in that:
The flue gas concentration tower is concentrated water pump by bottom and is connected to concentrated water case, and concentrated water case water outlet is equipped with mass flow control and sets
Standby, the mass flow control equipment enters the concentrated water quality of mixing and blending machine according to fixed mixing ratio control.
5. a kind of desulfurization wastewater flue gas concentration decrement according to claim 2 and cement fixed system, it is characterised in that:
Liquid level or more is concentrated in the flue gas concentration tower and arranges lance system, first lateral end be placed in concentration liquid level with
Between lance system, the cloth agitating device in the flue gas concentration tower lateral condensation liquid, concentrate is connected by water circulating pump
To lance system, the cycle heat exchange in flue gas concentration tower.
6. a kind of desulfurization wastewater flue gas concentration decrement according to claim 1 and cement fixed system, it is characterised in that:
The concentrated water case is equipped with pH detecting instrument and white lime water medicine system, and pH detecting instrument works as concentrated water for detecting concentrated water pH
White lime water is added when pH is less than 4 and adjusts concentrated water pH to 4.0-7.0.
7. a kind of desulfurization wastewater flue gas concentration decrement according to claim 1 and cement fixed system, it is characterised in that:
The fog room keeps constant temperature and humidity, and at 20 ± 3 DEG C, relative humidity is controlled in 60%-80% for temperature control.
8. a kind of desulfurization wastewater flue gas concentration decrement and cement technique for fixing, it is characterised in that: include:
Step 1: the neat stress after electric precipitator dedusting enters flue collector by air-introduced machine, and the flue gas of 85%-90% is direct
Into desulfurizing tower, quantitative row is needed after the accumulation of slurries chlorine ion concentration reaches threshold limit value by based Wet Process Flue Gas
Desulfurization slurry out, desulfurization slurry obtain gypsum and desulfurization wastewater after the dehydration of conventional dewatering system, and desulfurization wastewater is stored in de-
In sulphur waste water liquid reserve tank；
Step 2: the raw water in desulfurization wastewater liquid reserve tank enters the concentrate of flue gas concentration tower by water pump and raw water water inlet line
In；Flue gas extracts 10%-15% into the first lateral by high pressure blower in flue collector, enters cigarette by second branched pipe road
Gas concentration tower exchanges heat with the fluid column of concentrate, and the partial moisture after heat exchange in desulfurization wastewater is evaporated to vapor, with heat exchange
Flue gas afterwards enters flue collector through the second branch pipe(tube) of flue gas concentration tower top part, enters back into desulfurizing tower；
Step 3: the concentrate in flue gas concentration tower is transported to lance system through water circulating pump, the circulating picture-changing in flue gas concentration tower
Heat is discharged into concentrated water case by the way that water pump is concentrated when concentrate reaches design concentration rate, the pH detecting instrument detection in concentrated water case
Concentrated water pH, if concentrated water pH less than 4, need to be added appropriate white lime water by white lime water medicine system and concentrated water pH is adjusted to 4.0-
7.0, after pH is normal, the mass flow control equipment of dense tank outlet is stirred according to institute's water requirement in solidified body match ratio to mixing
It mixes and quantitatively exports concentrated water in device, the cementitious materials such as cement, flyash, starting mixing are added into mixing agitator by feeding machine
All raw material is mixed in blender；
Step 4: the slurry mixture formed after in time stirring mixing agitator is transferred in molding equipment, to slurry through for 24 hours
After molding, solidified body is transferred to fog room, continues to conserve under certain temperature and humidity.
9. a kind of desulfurization wastewater flue gas concentration decrement according to claim 8 and cement technique for fixing, it is characterised in that:
Desulfurization wastewater concentration rate in the step 3 is controlled at 5-10 times.
10. a kind of desulfurization wastewater flue gas concentration decrement according to claim 8 and cement technique for fixing, feature exist
In: the solidified body quality mixture ratio in the step 3 is cement: flyash: concentration waste water: river sand=3~6:1:2~4:3~
6.5。
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| CN112551627A (en) * | 2020-11-26 | 2021-03-26 | 武汉天空蓝环保科技有限公司 | Desulfurization waste water enrichment facility and zero discharge system |
| CN113582281A (en) * | 2021-08-11 | 2021-11-02 | 成都市蜀科科技有限责任公司 | Energy-saving low-temperature flue gas concentration process and device for desulfurization wastewater |
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| CN113582281A (en) * | 2021-08-11 | 2021-11-02 | 成都市蜀科科技有限责任公司 | Energy-saving low-temperature flue gas concentration process and device for desulfurization wastewater |
| CN114702094A (en) * | 2021-12-22 | 2022-07-05 | 国电电力邯郸东郊热电有限责任公司 | Comprehensive treatment system for tail end wastewater and tail end solid wastewater of coal-fired power plant |
| CN114702094B (en) * | 2021-12-22 | 2023-11-28 | 国电电力邯郸东郊热电有限责任公司 | Comprehensive treatment system for tail end wastewater and tail end wastewater of coal-fired power plant |
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