CN109354098A - A kind of processing system and method for desulfurization wastewater - Google Patents
A kind of processing system and method for desulfurization wastewater Download PDFInfo
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- CN109354098A CN109354098A CN201811574449.3A CN201811574449A CN109354098A CN 109354098 A CN109354098 A CN 109354098A CN 201811574449 A CN201811574449 A CN 201811574449A CN 109354098 A CN109354098 A CN 109354098A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 108
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 70
- 230000023556 desulfurization Effects 0.000 title claims abstract description 70
- 238000012545 processing Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000003546 flue gas Substances 0.000 claims abstract description 111
- 238000005201 scrubbing Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 19
- 239000012071 phase Substances 0.000 claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 7
- 239000007792 gaseous phase Substances 0.000 claims abstract description 6
- 239000007791 liquid phase Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 23
- 238000012546 transfer Methods 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 11
- 238000003672 processing method Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 19
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
-
- 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
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of processing system of desulfurization wastewater and methods.Processing system, including high-temperature flue gas pipeline, dynamic wave scrubber and scrubbing tower；The outlet of the high-temperature flue gas pipeline is connected to the gas phase entrance of the dynamic wave scrubber, and the gaseous phase outlet of the dynamic wave scrubber is connected to the gas access of the scrubbing tower；The sewage draining exit of the dynamic wave scrubber is connected to by circulating pump with the high-temperature flue gas pipeline, and the dynamic wave scrubber is additionally provided with desulfurization wastewater entrance as liquid phase entrance.The processing system exchanges the purpose for realizing concentration using the self-produced high-temperature flue gas of the plant area heat and mass circulating in dynamic wave scrubber with desulfurization wastewater, the processing system has many advantages, such as that process flow is short, equipment cost is low, recovered flue gas heat is to reduce operating cost, waste water fouling is not present, solves prior art processes long flow path, it is big to run difficulty, investment and the very high problem of operating cost.
Description
Technical field
The present invention relates to field of waste water treatment, more particularly, to the processing system and method for a kind of desulfurization wastewater.
Background technique
" limestone-gypsum " wet desulphurization waste water is the difficult point of power plant effluent zero-emission, and power plant effluent zero-emission is also main
Refer to desulfurization wastewater zero-emission.The total salt amount of wet desulphurization waste water, chloride ion, hardness, suspended matter, content of beary metal are all very
Height, reuse approach is very limited, and processing difficulty is also very big.Wet desulphurization wastewater treatment has become the emphasis of power plant's concern.
However, desulfurization wastewater zero-discharge technology school is more at present, and most of technology is in pilot, technical identification rank
Section, solves that fouling blockage, energy consumption existing for wastewater treatment be high, the problems such as at high cost are industry research focuses instantly.Therefore, it develops
Out one kind can safety and stability, it is low construction, the waste water zero-discharge technology of operating cost it is necessary.
Currently, general using " (chemical tendering+separation)+(film concentration/thermal method concentration)+(evaporative crystallization/flue evaporation) "
Handling principle, such as tradition MED technique and MVR technique, these process flows are long, and operation difficulty is big, investment and operating cost
It is very high.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of processing system of desulfurization wastewater, and the processing system is self-produced using plant area
The high-temperature flue gas heat and mass circulating in dynamic wave scrubber with desulfurization wastewater exchange the purpose for realizing concentration, the processing
System is with process flow is short, equipment cost is low, operating cost, there is no waste water fouling etc. is excellent to reduce for recovered flue gas heat
Point solves prior art processes long flow path, and operation difficulty is big, investment and the very high problem of operating cost.
The second object of the present invention is a kind of processing method of desulfurization wastewater, and the processing method is with process is short, does not relate to
And the features such as complicated high equipment, energy recovered flue gas heat, non-scaling, there is significant advantage in desulfurization wastewater process field.
In order to achieve the goal above, the present invention provides following technical schemes:
A kind of processing system of desulfurization wastewater, including high-temperature flue gas pipeline, dynamic wave scrubber and scrubbing tower；
The outlet of the high-temperature flue gas pipeline is connected to the gas phase entrance of the dynamic wave scrubber, the dynamic wave scrubbing
The gaseous phase outlet of device is connected to the gas access of the scrubbing tower；
The sewage draining exit of the dynamic wave scrubber is connected to by circulating pump with the high-temperature flue gas pipeline, and the dynamic wave is washed
It washs device and is additionally provided with desulfurization wastewater entrance as liquid phase entrance.
As described above, the present invention only includes three high-temperature flue gas pipeline, dynamic wave scrubber and scrubbing tower capital equipments,
And high-temperature flue gas pipeline and scrubbing tower are usually the own equipment of desulfurization wastewater blowdown factory (mainly power plant).It therefore, is right
Desulfurization wastewater carries out " zero " emission treatment, need to only increase dynamic wave scrubber.
The working principle of above-mentioned processing system is:
The high-temperature flue gas of high-temperature flue gas pipeline enters dynamic wave scrubber by the gas phase entrance of dynamic wave scrubber, simultaneously
Desulfurization wastewater enters dynamic wave scrubber, and the two (gas-liquid two-phase) direct counter current contacting, collision in dynamic wave scrubber carry out
Efficient heat transfer and mass transfer (close to adiabatic evaporation), the water evaporation in desulfurization wastewater is into flue gas at this time, so that desulfurization wastewater dries
Concentration and high-temperature flue gas humidifying cooling obtain concentration waste water and low-temperature flue gas at this time.Concentration waste water passes through dynamic wave scrubber
Sewage draining exit be recycled in high-temperature flue gas pipeline with smoke contacts, on the one hand flue gas is purified, it is on the other hand same with flue gas
When enter dynamic wave scrubber to be further concentrated, and so on, desulfurization wastewater is constantly concentrated, until reach predetermined
Concentration (custom requirements salinity reaches 40~50%).And the low-temperature flue gas generated at the same time passes through dynamic wave scrubber
Gaseous phase outlet enters scrubbing tower, empty by condensation water washing heel row.
The present invention has reached following technical effect using the above working mechanism:
1, during processing, the processing of desulfurization wastewater is not by ginsengs such as osmotic pressure, the elevation of boiling point and local evaporation intensities
Number limitation, therefore the concentration decrement of waste water by Waste water concentrating to saturation state, can be utmostly realized, significantly reduce subsequent steaming
Hair crystallization investment and operating cost.
2, the present invention recycles power plant in the concentration of desulfurization wastewater from the flue gas heat of row, further reduced energy consumption
And operating cost.
3, the present invention utilizes the principle of " dynamic wave " to make flue gas and waste water progress heat exchange, and the process is close to " insulation " mistake
Journey can utmostly utilize the heat of flue gas, and This further reduces energy consumptions, while waste water is located always in dynamic wave scrubber
In " turbulent flow " state, thus it is less scaling, corrosion will not be generated to equipment.
4, the concentration waste water for being recycled to flue usually makes smoke moisture increase by 0.25% or so, and flue-gas temperature reduces about
4 DEG C, flue gas is in undersaturated condition at this time, is higher than acid dew point, will not generate corrosion to flue and electrostatic precipitator；Instead due to
Flue-gas temperature reduces, and reduces the specific resistance of flying dust in electric precipitation, and be conducive to raising efficiency of dust collection (can enter dynamic in high-temperature flue gas
Deduster is arranged before the washer of Reeb to be dusted).
5, since the present invention does not need pretreatment workshop section, and the problems such as there is no foulings, corrosion, therefore system can be long-term
Stable operation, cost advantage are significant.
To sum up, processing system of the invention is using plant area self-produced high-temperature flue gas and desulfurization wastewater in dynamic wave scrubber
The purpose of concentration is realized in circulating heat and mass exchange, and the processing system is with process flow is short, equipment cost is low, recycling cigarette
Gas heat solves prior art processes long flow path, runs difficulty to reduce operating cost, the advantages that waste water fouling is not present
Greatly, investment and the very high problem of operating cost.
Dynamic wave scrubber used in the present invention is conventional equipment, generally by sluicing pipe, nozzle, detergent and circulating pump
Four major parts are constituted.It with liquid (present invention is using desulfurization wastewater as liquid) as detergent, by with high-speed flow
Two alternate heat and mass transfer processes are realized in the direct contact of (present invention is using high-temperature flue gas as high-speed flow), to reach purification
(being equivalent to concentration in the present invention), cooling, humidified gas technique requirement.
On this basis, processing system can also advanced optimize, specific as follows.
Preferably, the dynamic wave scrubber is connected with the liquid level for detecting liquid level in the dynamic wave scrubber
Meter.
Liquidometer is set to control liquid level without departing from the highest of the dynamic wave scrubber and limit.
Preferably, the scrubbing tower is connected with the liquidometer for detecting liquid level in the scrubbing tower.
Liquidometer is set to control liquid level without departing from the highest of the scrubbing tower and limit.
Preferably, the scrubbing tower is stuffing washing tower.
Stuffing washing tower operating cost is low, easy to operate.
Preferably, the scrubbing tower be equipped with condensing water inlet and washing produce water out, the condensing water inlet with it is described
Washing produces water out and is connected by heat exchanger connection and circulating pump.
Pass through the low energy consumption of water cycle down and water consumption.
Preferably, the condensing water inlet of the scrubbing tower is multiple.
Depending on the quantity of condensing water inlet is generally according to the requirement of scrubbing tower.
Preferably, the heat exchanger is plate heat exchanger.
The heat exchange efficiency of plate heat exchanger is higher.
Preferably, the sewage draining exit of the dynamic wave scrubber passes sequentially through circulating pump, triple valve and the high-temperature flue gas pipe
Road connection；
The import of the triple valve is connect with the circulating pump, two outlet respectively with the high-temperature flue gas pipeline, concentration
The connection of salt collecting pipe.
Setting triple valve is convenient for passing through concentration salt when concentration waste strength meets the requirements (such as reaching saturation state) and receiving
Collector recycling.
Preferably, the high-temperature flue gas pipeline is the smoke discharge tube road of boiler.
Preferably, pass through dedusting between the outlet and the gas phase entrance of the dynamic wave scrubber of the high-temperature flue gas pipeline
Device connection.
Before high-temperature flue gas enters dynamic wave scrubber, following effect can reach by dedusting:
The concentration waste water for being recycled to flue is injected into flue, herein atomization strong brine rapid vaporization, in waste water
Solidfied material and ash be suspended in flue gas and enter in electric precipitator with flue gas together and be captured, the solid contents in strong brine
About 76kg/h (normal concentration only enumerated) will not have an impact grey physical property and comprehensive utilization.On this basis also
Dedusting is realized, is provided with niche plinth for " zero " discharge of flue gas.
The present invention also provides the processing methods to match with above-mentioned desulfurization wastewater treatment system, including the following steps:
Step A: high-temperature flue gas and desulfurization wastewater carry out heat transfer and mass transfer in dynamic wave scrubber, the desulfurization is concentrated
Waste water obtains concentration waste water and low-temperature flue gas；
Step B: the concentration waste water reflux cycle is extremely contacted with the high-temperature flue gas, and is reentered dynamic wave simultaneously and washed
It washs device and desulfurization wastewater carries out heat transfer and mass transfer, the desulfurization wastewater is concentrated, obtain concentration waste water and low-temperature flue gas；
Step C: the processing of the concentration waste water continuity repeating said steps B, until the waste strength after concentration meets
Preset requirement；Enter scrubbing tower to the low-temperature flue gas continuity, by washing discharge hot water and tail gas.
The principle of this method is identical as processing system above, and effect achieved is also identical, with process is short, it is multiple not to be related to
The features such as miscellaneous high equipment, energy recovered flue gas heat, non-scaling, has significant advantage in desulfurization wastewater process field.
On this basis, method can also advanced optimize, specific as follows.
Preferably, further includes: the liquid level in the dynamic wave scrubber is monitored, to control liquid level without departing from the dynamic wave
The highest of washer limits.
Preferably, further includes: the liquid level in the scrubbing tower is monitored, to control highest of the liquid level without departing from the scrubbing tower
Limit.
Preferably, the scrubbing tower is stuffing washing tower.
Preferably, the scrubbing tower is water circulation type washing.
High-temperature flue gas used in the present invention can be any source of plant area, and the flue-gas temperature of separate sources is different, therefore
Process conditions when processing have certain difference.
Preferably, when the high-temperature flue-gas is 130~200 DEG C, the high temperature cigarette described in the dynamic wave scrubber
The flow-rate ratio of gas and the desulfurization wastewater is 70000~80000:5, preferably 75000~75400:5；
Preferably, the flow of the high-temperature flue gas is 70000~80000m3/h；
Preferably, the flow of the desulfurization wastewater is 3~5m3/h；
Preferably, the flow velocity that waste water reflux cycle is concentrated in the step B is 2~3m3/ h, preferably 2.5~3m3/h。
Preferably, when the high-temperature flue-gas is 300~450 DEG C, the high temperature cigarette described in the dynamic wave scrubber
The flow-rate ratio of gas and the desulfurization wastewater is 20000~23000:5, preferably 22000~22460:5；
Preferably, the flow of the high-temperature flue gas is 20000~23000m3/h；
Preferably, the flow of the desulfurization wastewater is 3~5m3/h；
Preferably, the flow velocity that waste water reflux cycle is concentrated in the step B is 2~3m3/ h, preferably 2.5~3m3/h。
By taking the hot fume of power plant as an example, temperature is usually 130~200 DEG C, at this time suitable more process conditions are as follows:
The flow of the desulfurization wastewater is 5m3/ h, the flow 75390m of high-temperature flue gas3/ h, after dynamic wave scrubber,
Flue-gas temperature is reduced to 56.2 DEG C, and flow changes into about 77889m3The flow velocity of concentration waste water reflux cycle is in/h, the step B
2.524m3/h。
By taking the flue gas of heat boiler as an example, the flue-gas temperature generated is generally 300~450 DEG C, at this time suitable technique item
Part are as follows:
The flow of the desulfurization wastewater is 5m3/ h, flue-gas temperature are 325 DEG C, the flow 22460m of high-temperature flue gas3/ h passes through
After dynamic wave scrubber, 56.2 DEG C of flue-gas temperature, flow 24935m3The flow velocity of waste water reflux cycle is concentrated in/h, the step B
For 2.524m3/h。
Preferably, in the step B, in the concentration waste water reflux cycle to after being contacted with the high-temperature flue gas,
Dynamic wave scrubber is reentered and before desulfurization wastewater carries out heat transfer and mass transfer, also by deduster dedusting.
To sum up, compared with prior art, invention achieves following technical effects.
(1) during processing, the processing of desulfurization wastewater is not by ginsengs such as osmotic pressure, the elevation of boiling point and local evaporation intensities
Number limitation, therefore the concentration decrement of waste water by Waste water concentrating to saturation state, can be utmostly realized, significantly reduce subsequent steaming
Hair crystallization investment and operating cost.
(2) present invention recycles power plant in the concentration of desulfurization wastewater from the flue gas heat of row, further reduced energy
Consumption and operating cost.
(3) present invention utilizes the principle of " dynamic wave " to make flue gas and waste water progress heat exchange, and the process is close to " insulation " mistake
Journey can utmostly utilize the heat of flue gas, and This further reduces energy consumptions, while waste water is located always in dynamic wave scrubber
In " turbulent flow " state, thus it is less scaling, corrosion will not be generated to equipment.
(4) the concentration waste water for being recycled to flue usually makes smoke moisture increase by 0.25% or so, and flue-gas temperature reduces
About 4 DEG C, flue gas is in undersaturated condition at this time, is higher than acid dew point, will not generate corrosion to flue and electrostatic precipitator；Instead by
It is reduced in flue-gas temperature, reduces the specific resistance of flying dust in electric precipitation, be conducive to raising efficiency of dust collection (can enter in high-temperature flue gas
Deduster is arranged before dynamic wave scrubber to be dusted).
(5) since the present invention does not need pretreatment workshop section, and the problems such as there is no foulings, corrosion, therefore system can be grown
Phase stable operation, cost advantage are significant.
(6) liquid level that liquidometer comes in detection device is added, guarantees that system is stable, is safely operated.
(7) the concentration waste water being recycled in flue will not adversely affect the dedusting of flue gas, i.e., do not influence normally to remove
Dirt, it is not necessary that related cleaner is transformed.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the desulfurization wastewater treatment system that the embodiment of the present invention 1 provides；
Appended drawing reference:
1- high-temperature flue gas pipeline, 2- dynamic wave scrubber, 3- stuffing washing tower,
First liquidometer of 4-, second liquidometer of 5-, 6- triple valve,
First circulating pump of 7-, 8- heat exchanger, second circulating pump of 9-.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with the drawings and specific embodiments, but
Be it will be understood to those of skill in the art that it is following described embodiments are some of the embodiments of the present invention, rather than it is whole
Embodiment is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.Based on the embodiments of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same
Or production firm person is not specified in instrument, is the conventional products that can be obtained by commercially available purchase.
Embodiment 1
As shown in Figure 1, a kind of processing system of desulfurization wastewater, including high-temperature flue gas pipeline 1, dynamic wave scrubber 2 and fill out
Expect scrubbing tower 3.
The outlet of the high-temperature flue gas pipeline 1 is connected to the gas phase entrance of the dynamic wave scrubber 2, and the dynamic wave is washed
The gaseous phase outlet for washing device 2 is connected to the gas access of the stuffing washing tower 3.
The sewage draining exit of the dynamic wave scrubber 2 passes sequentially through first circulating pump 7, triple valve 6 and the high-temperature flue gas
Pipeline 1 is connected to, and the dynamic wave scrubber 2 is additionally provided with desulfurization wastewater entrance as liquid phase entrance.
The dynamic wave scrubber 2 is connected with first liquid for detecting liquid level in the dynamic wave scrubber 2
Position meter 4.
Equally, the stuffing washing tower 3 is connected with second liquid for detecting liquid level in the stuffing washing tower 3
Position meter 5.
Stuffing washing tower 3 sets there are two condensing water inlet and washs production water out, and the condensing water inlet is washed with described
It washs and produces that water out is connected by heat exchanger 8 and second circulating pump 9 connects, to guarantee the recycling of condensed water.
Above embodiments may be implemented low cost, low energy consumption, expeditiously handle desulfurization wastewater, and reach exhaust emissions
Standard and the recycling of the high value of salt.The System Working Principle of the embodiment is as follows:
The high-temperature flue gas of high-temperature flue gas pipeline 1 enters dynamic wave scrubber 2 by the gas phase entrance of dynamic wave scrubber 2,
Desulfurization wastewater enters dynamic wave scrubber 2 simultaneously, the two (gas-liquid two-phase) in dynamic wave scrubber 2 direct counter current contacting, touch
It hits, carries out efficient heat transfer and mass transfer (close to adiabatic evaporation), the water evaporation in desulfurization wastewater is into flue gas at this time, so that desulfurization is useless
Water dries concentration and high-temperature flue gas humidifying cooling, obtains concentration waste water and low-temperature flue gas at this time.Concentration waste water passes through dynamic wave
The sewage draining exit of washer 2 is recycled in high-temperature flue gas pipeline 1 with smoke contacts, is on the one hand purified to flue gas, on the other hand
Enter dynamic wave scrubber 2 simultaneously with flue gas to be further concentrated, and so on, desulfurization wastewater is constantly concentrated, directly
To reaching scheduled concentration (custom requirements salinity reaches 40~50%).And the low-temperature flue gas generated at the same time passes through power
The gaseous phase outlet of wave washer 2 enters scrubbing tower, empty by condensation water washing heel row.
In the above process, the flow of concentration waste water is controlled by circulating pump, two liquidometers control dynamic wave respectively and wash
The liquid level in device 2 and stuffing washing tower 3 is washed, to ensure that device can operate normally.
The embodiment is only one of embodiments of the present invention, can also increase other structures or replacement on this basis
Certain part-structure, to change technical effect, such as the aspect being set forth below.
Liquidometer could alternatively be other detection devices or inductor, or selection personal monitoring's liquid level.
The structure of scrubbing tower can choose other way, be not limited only to material filling type.
The source of high-temperature flue gas pipeline 1 is various, such as power plant or heating heat boiler etc..
In general, being usually dusted before high-temperature flue gas enters dynamic wave scrubber 2, i.e., for cleaning high-temp flue gas
The outlet of the high-temperature flue gas pipeline 1 is connected to between the gas phase entrance of the dynamic wave scrubber 2 by deduster.
In practical application, other parts leaved for development can also be added according to demand.
When the system of the present embodiment uses the high-temperature flue gas of separate sources, the process conditions for handling desulfurization wastewater have difference
It is different, but qualified discharge (even " zero " discharges) and salt recycling, low cost, high efficiency in high yield can be realized by optimal conditions
Ground purpose.
By taking the hot fume of power plant as an example, temperature is usually 130~200 DEG C, at this time suitable more process conditions are as follows:
The flow of the desulfurization wastewater is 5m3/ h, the flow 75390m of high-temperature flue gas3/ h, after dynamic wave scrubber,
Flue-gas temperature is reduced to 56.2 DEG C, and flow changes into about 77889m3The flow velocity of concentration waste water reflux cycle is in/h, the step B
2.524m3/h。
By taking the flue gas of heat boiler as an example, the flue-gas temperature generated is generally 300~450 DEG C, at this time suitable technique item
Part are as follows:
The flow of the desulfurization wastewater is 5m3/ h, flue-gas temperature are 325 DEG C, the flow 22460m of high-temperature flue gas3/ h passes through
After dynamic wave scrubber, flue-gas temperature is reduced to 56.2 DEG C, flow 24935m3Waste water reflux cycle is concentrated in/h, the step B
Flow velocity is 2.524m3/h。
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of processing system of desulfurization wastewater, which is characterized in that including high-temperature flue gas pipeline, dynamic wave scrubber and washing
Tower；
The outlet of the high-temperature flue gas pipeline is connected to the gas phase entrance of the dynamic wave scrubber, the dynamic wave scrubber
Gaseous phase outlet is connected to the gas access of the scrubbing tower；
The sewage draining exit of the dynamic wave scrubber is connected to by circulating pump with the high-temperature flue gas pipeline, the dynamic wave scrubber
Desulfurization wastewater entrance is additionally provided with as liquid phase entrance.
2. the processing system of desulfurization wastewater according to claim 1, which is characterized in that the dynamic wave scrubber is connected with
For detecting the liquidometer of liquid level in the dynamic wave scrubber；
Preferably, the scrubbing tower is connected with the liquidometer for detecting liquid level in the scrubbing tower；
Preferably, the scrubbing tower is stuffing washing tower；
Preferably, the scrubbing tower is equipped with condensing water inlet and washing produces water out, the condensing water inlet and the washing
Water out is produced to connect by heat exchanger connection and circulating pump；
Preferably, the condensing water inlet of the scrubbing tower is multiple；
Preferably, the heat exchanger is plate heat exchanger.
3. the processing system of desulfurization wastewater according to claim 1, which is characterized in that the blowdown of the dynamic wave scrubber
Mouth passes sequentially through circulating pump, triple valve is connected to the high-temperature flue gas pipeline；
The import of the triple valve is connect with the circulating pump, and two outlets are received with the high-temperature flue gas pipeline, concentration salt respectively
Collector connection.
4. the processing system of desulfurization wastewater according to claim 1, which is characterized in that the high-temperature flue gas pipeline is boiler
Smoke discharge tube road.
5. the processing system of desulfurization wastewater according to claim 1, which is characterized in that the outlet of the high-temperature flue gas pipeline
It is connected between the gas phase entrance of the dynamic wave scrubber by deduster.
6. a kind of processing method of desulfurization wastewater, characterized in that it comprises the following steps:
Step A: high-temperature flue gas and desulfurization wastewater carry out heat transfer and mass transfer in dynamic wave scrubber, useless the desulfurization is concentrated
Water obtains concentration waste water and low-temperature flue gas；
Step B: the concentration waste water reflux cycle is extremely contacted with the high-temperature flue gas, and reenters dynamic wave scrubber simultaneously
Heat transfer and mass transfer are carried out with desulfurization wastewater, the desulfurization wastewater is concentrated, obtains concentration waste water and low-temperature flue gas；
Step C: the processing of the concentration waste water continuity repeating said steps B is preset until the waste strength after concentration meets
It is required that；Enter scrubbing tower to the low-temperature flue gas continuity, by washing discharge hot water and tail gas.
7. the processing method of desulfurization wastewater according to claim 6, which is characterized in that further include: monitor the dynamic wave
Liquid level in washer is limited with controlling liquid level without departing from the highest of the dynamic wave scrubber；
Preferably, further includes: monitor the liquid level in the scrubbing tower, limited with controlling liquid level without departing from the highest of the scrubbing tower
Position；
Preferably, the scrubbing tower is stuffing washing tower；
Preferably, the scrubbing tower is water circulation type washing.
8. the processing method of desulfurization wastewater according to claim 6, which is characterized in that the high-temperature flue-gas is 130
At~200 DEG C, the flow-rate ratio of the high-temperature flue gas described in the dynamic wave scrubber and the desulfurization wastewater is 70000~
80000:5, preferably 75000~75400:5；
Preferably, the flow of the high-temperature flue gas is 70000~80000m3/h；
Preferably, the flow of the desulfurization wastewater is 3~5m3/h；
Preferably, the flow velocity that waste water reflux cycle is concentrated in the step B is 2~3m3/ h, preferably 2.5~3m3/h。
9. the processing method of desulfurization wastewater according to claim 6, which is characterized in that the high-temperature flue-gas is 300
At~450 DEG C, the flow-rate ratio of the high-temperature flue gas described in the dynamic wave scrubber and the desulfurization wastewater is 20000~
23000:5, preferably 22000~22460:5；
Preferably, the flow of the high-temperature flue gas is 20000~23000m3/h；
Preferably, the flow of the desulfurization wastewater is 3~5m3/h；
Preferably, the flow velocity that waste water reflux cycle is concentrated in the step B is 2~3m3/ h, preferably 2.5~3m3/h。
10. the processing method of desulfurization wastewater according to claim 6, which is characterized in that in the step B, described dense
Contracting return of waste water is recycled to contacted with the high-temperature flue gas after, passed reentering dynamic wave scrubber with desulfurization wastewater
Before heat and mass transfer, also pass through deduster dedusting.
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