CN107226571A - Desulfurization wastewater treatment system and method for treating desulfurized wastewater - Google Patents
Desulfurization wastewater treatment system and method for treating desulfurized wastewater Download PDFInfo
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- CN107226571A CN107226571A CN201710425062.0A CN201710425062A CN107226571A CN 107226571 A CN107226571 A CN 107226571A CN 201710425062 A CN201710425062 A CN 201710425062A CN 107226571 A CN107226571 A CN 107226571A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
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- 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
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
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Abstract
The present invention provides a kind of desulfurization wastewater treatment system and method for treating desulfurized wastewater, and the desulfurization wastewater treatment system includes desulfurizer, waste-water vortex device, Sand Filtration System, chimney flue type heat exchanger, supersonic atomizer and the deduster being sequentially communicated.Waste-water vortex device carries out separation of solid and liquid to desulfurization wastewater.Sand Filtration System is filtered to desulfurization wastewater.Chimney flue type heat exchanger be located at desulfurizer gas approach, desulfurization wastewater in chimney flue type heat exchanger and high-temperature flue gas exchanged heat.Supersonic atomizer has nozzle, and supersonic atomizer carries out atomization process to form droplet to desulfurization wastewater.Deduster has inlet flue duct, the nozzle of supersonic atomizer is installed in the inlet flue duct of deduster so that the desulfurization wastewater after atomization is sprayed onto the inlet flue duct of deduster, the desulfurization wastewater of atomization is dried by high-temperature flue gas and separates out inorganic salt particle, and inorganic salt particle enters deduster and is removed.
Description
Technical field
The present invention relates to technical field of waste water processing, more particularly to a kind of desulfurization wastewater treatment system and desulfurization wastewater processing
Method.
Background technology
At home under the requirement of environmental transformation, the overwhelming majority is in-service at present and is provided with flue gas with newly-built fired power generating unit
Wet desulphurization device, to ensure that the flue gas of discharged from coal-fired boiler of fired power generating unit is up to standard, in particular up to strict is environmentally friendly ultralow
Discharge standard.Wherein, more than 90% coal-burning power plant uses Limestone-gypsum Wet Flue Gas Desulfurization Process technique and its device, the technique
Advantages, are widely used, and its Main By product is desulfurated plaster and desulfurization wastewater.Desulfurated plaster can be reused, still
Desulfurization wastewater is because containing substantial amounts of impurity, such as suspension, inorganic ion, heavy metal ion are, it is necessary to carry out purified treatment
It can discharge, this can undoubtedly produce a high operation and maintenance expenses and use.
Limestone-gypsum desulphurization system includes desulfurizing tower.Due to prohibiting at present in fired power generating unit desulphurization system
Desulfurization is set to bypass, therefore after the flue gas of discharged from coal-fired boiler must be processed via desulfurizing tower, could be further via cigarette
Arranged outside chimney.Inside the tower such as the inner wall anti-corrosive layer of desulfurizing tower, fiberglass spraying layer, oxidation wind pipeline and polypropylene (PP) demister
The tolerable temperature scope of part is no more than 80 DEG C.Usually, normal operating temperature, at 50 DEG C or so, can meet tower in desulfurizing tower
The tolerable temperature requirement of inner part.However, the flue-gas temperature in the air-introduced machine exit of coal-burning boiler is general at 110 DEG C to 160 DEG C
Between, can not certainly will directly it enter that is out the tolerable temperature of the part in desulfurizing tower, therefore from the flue gas of discharged from coal-fired boiler
Enter in desulfurizing tower.That is, the flue-gas temperature into wet desulphurization device is too high, the height of wet desulphurization device how will be entered
It is a problem that warm flue gas, which carries out advance chilling cooling,.
Current existing desulfuration waste water treatment process generally comprises the basic steps such as neutralization, flocculation, precipitation, outer row.It is near several
People's many desulfuration waste water treatment process, such as evaporation, reuse, clarification technique newly developed over year.Although these techniques for
The recycling of desulfurization wastewater has certain effect and effect, but problem also compares many, for example, need newly-increased large number quipments facility, account for
Ground area is big, investment is big, technological process is complicated, equipment failure rate is high, operational effect is undesirable, dehydrating effect is not good, at product
Reason disposal is inconvenient, exist and phenomenon etc. is arranged outside waste water.These problems have a strong impact on the commercial Application of desulfuration waste water treatment process.
The content of the invention
It is existing to solve it is an object of the invention to provide a kind of processing system of desulfurization wastewater and method for treating desulfurized wastewater
Desulfuration waste water treatment process exist above mentioned problem and existing wet desulfurizing process in enter desulfurizer in flue gas
Temperature is too high, the problem of chilling not yet in effect cools.
To solve the above problems, the invention of this reality provides a kind of desulfurization wastewater treatment system, including desulfurizer, waste-water vortex
Device, Sand Filtration System, chimney flue type heat exchanger, supersonic atomizer and deduster.
Waste-water vortex device is communicated in the desulfurizer, and waste-water vortex device carries out separation of solid and liquid to desulfurization wastewater.
Sand Filtration System is communicated in waste-water vortex device, and Sand Filtration System is filtered to desulfurization wastewater.
Chimney flue type heat exchanger is communicated in Sand Filtration System and positioned at the gas approach of desulfurizer, and desulfurization wastewater is changed in chimney flue type
Exchanged heat in hot device with high-temperature flue gas.
Supersonic atomizer is communicated in chimney flue type heat exchanger and with nozzle, and supersonic atomizer enters to desulfurization wastewater
Row atomization process is to form droplet.
Deduster has inlet flue duct, and the nozzle of supersonic atomizer is installed in the inlet flue duct of deduster so that atomization
Desulfurization wastewater afterwards is sprayed onto the inlet flue duct of deduster, and the desulfurization wastewater of atomization is dried by high-temperature flue gas and separates out inorganic salts
Grain, inorganic salt particle enters deduster and is removed.
According to one embodiment of the invention, Sand Filtration System includes filtration system and backwashing system, and filtration system is used to filter
Desulfurization wastewater, backwashing system is used to backwash.
According to one embodiment of the invention, chimney flue type heat exchanger includes water inlet pipe, heat exchanger components and water spray grid, water inlet
Pipe, heat exchanger components and water spray grid three interconnect, and heat exchanger components are duct type heat exchanger components, and water spray grid is located at heat exchange
The side of part, water spray grid towards and be directed at the heat exchanger components.
According to one embodiment of the invention, chimney flue type heat exchanger further comprises the first control valve and the second control valve, first
Control valve is connected between water inlet pipe and heat exchanger components, and the second control valve is connected between water inlet pipe and water spray grid.
According to one embodiment of the invention, desulfurization wastewater treatment system further comprise can pressurizing delivery pump, can pressure-increasing unit
Pump is connected between waste-water vortex device and chimney flue type heat exchanger, and waste water delivery pump has function of increasing pressure.
According to one embodiment of the invention, deduster is communicated in desulfurizer, and desulfurization wastewater is net through removing inorganic salt particle
Change forms water vapour and is back to desulfurizer.
According to a further aspect of the invention, the present invention further provides a kind of method for treating desulfurized wastewater, comprise the following steps：
Solid-liquid separation step, is delivered to waste-water vortex device from desulfurizer by desulfurization wastewater and carries out separation of solid and liquid processing, with
Underflow and overflow are formed, wherein overflow solid content is not more than 1%；
Filtration step, is delivered to Sand Filtration System by the overflow after being handled by waste-water vortex device and is filtered, de- after filtering
Sulphur waste water solid content is less than 0.01%；
Heat exchange step, the desulfurization wastewater after filtering is delivered to the water inlet pipe of chimney flue type heat exchanger, opens the first control valve
So that desulfurization wastewater enters the heat exchanger components of chimney flue type heat exchanger and shunting, desulfurization wastewater and high-temperature flue gas are exchanged heat, desulfurization
Waste water heat absorption heating, cooling high-temperature fume, wherein the first control valve is connected between water inlet pipe and heat exchanger components；
Atomization steps, the desulfurization wastewater after heat exchange are delivered to the nozzle of supersonic atomizer, the cigarette after heat exchange cooling
Gas is delivered to desulfurizer, and desulfurization wastewater is atomized into small droplet by supersonic atomizer, produces electric anion；
Dust separation step, the desulfurization wastewater after atomization is sprayed into the inlet flue duct of deduster, the desulfurization wastewater after atomization
Dried in the inlet flue duct of deduster by high-temperature flue gas, the inorganic salts in desulfurization wastewater are precipitated simultaneously and dust is in deduster
It is removed, desulfurization wastewater is cleaned to form water vapour through removing inorganic salts, and water vapour is back to desulfurizer by deduster.
According to one embodiment of the invention, the method for treating desulfurized wastewater further comprises the steps：
Cleaning, closes the first control valve, opens the second control valve to run the water spray grid of chimney flue type heat exchanger, takes off
Sulphur waste water enters water spray grid through water inlet pipe and is sprayed onto heat exchanger components, so that heat exchanger components are cleaned, wherein the second control valve is connected
Between water inlet pipe and water spray grid.
According to one embodiment of the invention, the method for treating desulfurized wastewater further comprises the steps：
Spray cooling step, when desulfurizer run break down or flue-gas temperature it is too high when, open the first control valve and
Second control valve is to run heat exchanger components and water spray grid simultaneously, so that flue gas is cooled by spray cooling and heat exchange simultaneously；
The 3rd control valve on amount of makeup water step, the water pipeline for the technique water tank for opening desulfurizer, with from technique
Water tank amount of makeup water is to chimney flue type heat exchanger.
Compared with prior art, the technical program has advantages below：
The present invention by waste-water vortex device, Sand Filtration System, chimney flue type heat exchanger, supersonic atomizer and deduster,
It can realize that the desulfurization wastewater for discharging desulfurizer carries out separation of solid and liquid, filtering, heat exchange heating, atomization process and baking successively
It is dry to separate out the series of processing steps such as inorganic salts, cleaning and desulfurization waste water is reached, the purpose of purified water vapour is finally obtained, reaches
To environmental requirement.Second, it is passed into again in desulfurizer via the water vapour after purification, realizes desulfurization wastewater zero-emission,
Saving water resource.3rd, by the way that chimney flue type heat exchanger to be arranged to the gas approach of desulfurizer, to enter desulfurizer
Interior high-temperature flue gas and the desulfurization wastewater circulated in chimney flue type heat exchanger carry out vapor liquid heat exchange, on the one hand give desulfurization wastewater liter
Temperature improves the evaporation efficiency of atomization process process in order to carry out follow-up atomization process, reduces entering for supersonic atomizer
Mouth flue length, Mist heat recovering, energy-conserving and environment-protective, on the other hand to cooling high-temperature fume, it is to avoid enter inside desulfurizer
Flue-gas temperature is too high, can so maximally utilize desulfurization wastewater resource, and the exhaust gas volumn of reduction desulfurizer processing saves desulfurization
Device space, reduces the investment of desulfurizer.3rd, the desulfurization wastewater treatment system can be removed effectively in desulfurization wastewater
Inorganic salts, heavy metal ion, do not produce secondary pollution.
The Sand Filtration System of the present invention includes filtration system and backwashing system, you can desulfurization wastewater is entered using filtration system
Row filtering, can periodically be backwashed to clean the deposit of internal deposition, it is ensured that filter efficiency to Sand Filtration System, be easy to sand again
The cleaning of filter system, care and maintenance.
On the one hand the present invention can be sprayed water to heat exchanger components, so as to clean heat exchange by grid of spraying water by grid of spraying water
Part, water that on the other hand can be using grid injection of spraying water and the hot friendship of high-temperature flue gas progress being passed through in chimney flue type heat exchanger
Change, so that more fully cooling high temperature flue gas, it is to avoid the problem of cooling high-temperature fume amplitude is undesirable.
The present invention by set can pressurizing delivery pump, can be changed from amount of makeup water to chimney flue type in the technique water tank of desulfurizer
Hot device, it is to avoid the inlet channel hydraulic pressure of chimney flue type heat exchanger not enough, can meet water spray grid and heat exchanger components are run simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation of desulfurization wastewater treatment system provided in an embodiment of the present invention；
Fig. 2 is the structural representation of the chimney flue type heat exchanger of above-mentioned desulfurization wastewater treatment system.
Embodiment
Description is served only for disclosing the present invention enabling those skilled in the art to implement the present invention below.In describing below
Preferred embodiment be only used as citing, it may occur to persons skilled in the art that other obvious are deformed.In the following description
The general principle of the invention defined can be applied to other embodiments, deformation program, improvement project, equivalent and other
Without departing from other schemes of spirit and scope of the invention.
As shown in figure 1, the present invention provides a kind of desulfurization wastewater treatment system, the desulfurization wastewater treatment system includes desulfurization
Device 1, waste-water vortex device 2, Sand Filtration System 3, chimney flue type heat exchanger 4, supersonic atomizer 5, deduster 6.Waste-water vortex device 2
The desulfurizer 1 is communicated in, waste-water vortex device 2 carries out separation of solid and liquid to desulfurization wastewater.Sand Filtration System 3 is communicated in waste-water vortex
Device 2, Sand Filtration System 3 is filtered to desulfurization wastewater.Chimney flue type heat exchanger 4 is communicated in Sand Filtration System 3 and positioned at desulfurizer 1
Gas approach 11, desulfurization wastewater is exchanged heat in chimney flue type heat exchanger 4 with high-temperature flue gas.Supersonic atomizer 5 is communicated in
Chimney flue type heat exchanger 4 simultaneously has nozzle, and supersonic atomizer 5 carries out atomization process to form droplet to desulfurization wastewater.Dedusting
Device 6 has inlet flue duct 61, and the nozzle of supersonic atomizer 5 is installed in the inlet flue duct 61 of deduster 6 so that after atomization
Desulfurization wastewater is sprayed onto the inlet flue duct 61 of deduster 6, and the desulfurization wastewater of atomization is dried by high-temperature flue gas and separates out inorganic salts
Grain, inorganic salt particle enters deduster 6 and is removed.
Specifically, the desulfurization wastewater that desulfurizer 1 is produced is delivered to waste-water vortex device 2, waste water rotation through waste water delivery pump
Stream device 2 carries out separation of solid and liquid to desulfurization wastewater and forms underflow and overflow.Waste-water vortex device 2 have fine particle classification remove,
Overflow filtering function, disclosure satisfy that overflow solid content is not more than 1%.The underflow of waste-water vortex device 2 is discharged into desulfurizer 1, waste water
The excessive waste water flowing delivery pump of cyclone 2 is discharged into Sand Filtration System 3.
Sand Filtration System 3 has the function of the macromolecular solid particle and colloid in retention desulfurization wastewater, makes desulfurization wastewater clear
Clearly, and the iron ion in desulfurization wastewater can be removed.Sand Filtration System 3 includes filtration system 31 and backwashing system 32.Filtering
System 31 is used to filter, and backwashing system 32 is used to backwash, technique water tank of the backwashing water from desulfurizer 1, backwash
Sewer enters the desulfurizing tower of desulfurizer 1 and by being arranged outside gypsum belt dewaterer, and backwash frequency is according to actual motion feelings
Depending on condition.In the present embodiment, Sand Filtration System 3 realizes continuous work, and desulfurization wastewater is after the filtration treatment of Sand Filtration System 3, filtering
The desulfurization wastewater solid content gone out is not more than 0.01%.Desulfurization wastewater after being filtered through Sand Filtration System 3 is conveyed by waste water delivery pump
To chimney flue type heat exchanger 4.
The function of chimney flue type heat exchanger 4 is liquid-gas heat exchange and the cooling of wet desulphurization device chilling.Desulfurization wastewater is in chimney flue type
Pending high-temperature flue gas in heat exchanger 4 with desulfurizer 1 carries out liquid-gas heat exchange, so that by such mode, it is on the one hand real
Now desulfurization wastewater is heated up, on the other hand realizes and high-temperature flue gas chilling is cooled.
Fig. 2 illustrates the structure of chimney flue type heat exchanger 4, with reference to Fig. 1 and Fig. 2, chimney flue type heat exchanger 4 include water inlet pipe 41,
Heat exchanger components 42 and water spray grid 43.Water inlet pipe 41, heat exchanger components 42 and the water spray three of grid 43 are mutual by three-way pipeline
It is connected.Heat exchanger components 42 are a kind of duct type heat exchanger components.Grid 43 of spraying water is located at the side of heat exchanger components 42, grid of spraying water
43 nozzle to towards and quasi- heat exchanger components 42 pipeline gap.Chimney flue type heat exchanger 4 sets control valve, for adjusting water inlet
Flow direction.
Desulfurization wastewater after filtering enters heat exchanger components 42 by water inlet pipe 41.Desulfurization wastewater is in chimney flue type heat exchanger 4
Fully contacted with high-temperature flue gas, desulfurization wastewater heat absorption heating, high-temperature flue gas heat release drop is realized and high-temperature flue gas chilling is cooled.
It is noted that when grid 43 of spraying water is opened, desulfurization wastewater enters water spray grid 43 and is sprayed onto heat exchanging part
Part 42.The high-temperature flue gas of the water spray desulfurization wastewater of grid 43 and wet desulphurization device 1 carries out chilling cooling, on the other hand can clean
Heat exchanger components 42.
Chimney flue type heat exchanger 40 also includes the first control valve 44 and the second control valve 45, and the first control valve 44 is arranged at heat exchange
Between part 42 and water inlet pipe 41, the second control valve 45 is arranged between water spray grid 43 and water inlet pipe 41.First control valve 44
It is used to adjust water inlet flow direction with the second control valve 45.
During chimney flue type 40 conventional operation of heat exchanger, the second control valve 45 is closed, the first control valve 44, desulfurization wastewater warp is opened
First control valve 44 enters heat exchanger components 42 and carries out vapor liquid heat exchange, high-temperature flue-gas reduction, the rise of desulfurization wastewater temperature.
Flue gas after cooling enters desulfurizer 1, and the desulfurization wastewater after heating enters supersonic atomizer 5.
The supersonic generator of supersonic atomizer 5 can make the desulfurization wastewater after heat temperature raising pass through dither mist
Change, desulfurization wastewater enter supersonic atomizer 5 after be atomized into 10um~60um mist droplet, and discharge it is substantial amounts of bear from
Son.The mist droplet that atomization is formed is injected into deduster 6.
Deduster 6 has inlet flue duct 61, and the nozzle of supersonic atomizer 5 is installed in the inlet flue duct 61 of deduster 6
So that the desulfurization wastewater after atomization is injected into the inlet flue duct 61 of deduster.Mist droplet is in inlet flue duct 61 by high-temperature flue gas
Drying, inorganic in mist droplet salts out to form inorganic salt particle and with high-temperature flue gas enter inside deduster 6.Inorganic salts
Particle is removed in deduster 6 with dust.Deduster 6 is communicated in desulfurizer 1, the water for removing inorganic salts and being cleaned
Steam is back to desulfurizer 1 to enter next circulation with flue gas.
When chimney flue type heat exchanger 40 run a period of time after, the surface of heat exchanger components 42 may dust stratification, it is necessary to be cleaned.
Now, the second control valve 45 is opened, the first control valve 44 is closed, water spray grid 43 is run to be cleaned with exchanging thermal part 42.
After cleaning terminates, the second control valve 45 is closed, the first control valve 44 is opened, chimney flue type heat exchanger 40 continues positive conventional operation, clearly
Wash waste water and desulfurizer 1 is flowed into by the gas approach 11 of desulfurizer 1.
The desulfurization wastewater treatment system further comprise can pressurizing delivery pump 7, can pressurizing delivery pump 7 be connected to sand filtration system
System 3 and chimney flue type heat exchanger 4 between, and can pressurizing delivery pump 7 connect desulfurizer 1 technique water tank.Can pressurizing delivery pump 7
With function of increasing pressure so that heat exchanger components 42 and water spray grid 43 are run simultaneously.Can pressurizing delivery pump 7 and desulfurizer 1 technique
3rd control valve 8 is set between water tank, and the 3rd control valve 8 is arranged on the water pipeline of technique water tank of desulfurizer 1.
When flue-gas temperature is too high to cause parts damages, can the pressurization operation of pressurizing delivery pump 7, in the pipeline of water inlet pipe 41
Desulfurization wastewater pressure, which increases to, disclosure satisfy that while opening the first control valve 44 and the second control valve 45, it is ensured that the water spray He of grid 43
The normal operation simultaneously of heat exchanger components 42.
When 1 operation troubles of desulfurizer, high-temperature flue gas, which is directly entered desulfurizer 1, can cause serious thermal shock, in order to
Reduction loss before high-temperature flue gas enters desulfurizer 1, it is necessary to carry out chilling cooling.Therefore when desulfurizer 1 breaks down,
Can the pressurization operation of pressurizing delivery pump 7, meet the first control valve 44 and the second control valve 45 and open simultaneously, spraying water grid 43 and exchanges heat
The normal operation simultaneously of part 42, it is high under the spray cooling of water spray grid 43 and the heat exchange cooling double action of heat exchanger components 42
Warm flue-gas temperature is reduced under the permissive temperature of desulfurizer 1 (being not more than 80 DEG C).That is, chimney flue type heat exchanger 4 have pair
High-temperature flue gas carries out the function of chilling cooling, and protection desulfurizer 1 is from thermal shock.
When cooling high-temperature fume amplitude is big, while running water spray grid 43 and heat exchanger components 42 needs the desulfurization wastewater of supply
When amount is not enough, opening controlling valve door 8, not enough water from the technique water tank of desulfurizer 1 be delivered to can the entrance of pressurizing delivery pump 7 simultaneously
The water inlet pipe 41 of chimney flue type heat exchanger 4 is pumped into, reallocation enters water spray grid 43 and heat exchanger components 42, so as to supply water spray grid
43 and heat exchanger components 42 run institute water requirement simultaneously, reach the effect of chilling cooling, and do not influence miscellaneous equipment normally to run.
The desulfurization wastewater treatment system that the present invention is provided has the following advantages that：
First, desulfurization wastewater returns to desulfurizer 1 after being purified through the desulfurization wastewater treatment system, realizes desulfurization
Wastewater zero discharge, saves water resource.Second, chimney flue type heat exchanger 4 serves many purposes, on the one hand for reducing desulfurizer 1
Pending high-temperature flue-gas, on the other hand for carrying out heat temperature raising to desulfurization wastewater, realizes desulfurization wastewater recycling, heat
Can rationally it utilize.3rd, the place of desulfurizer 1 can be reduced by the heat exchange effect reduction flue-gas temperature of chimney flue type heat exchanger 4
Exhaust gas volumn is managed, the investment of desulfurizer 1 is reduced, the space of desulfurizer 1 is saved.4th, realized by chimney flue type heat exchanger 4
Flue gas waste heat recovery, realizes the purpose of energy-saving and emission-reduction.5th, the desulfurization wastewater after heat temperature raising first passes through supersonic atomizer
Deduster 6 is sprayed into after 5 atomization process again, evaporation rate of the desulfurization wastewater in the inlet flue duct 61 of deduster 6, reduction is improved
The length requirement of inlet flue duct 61.6th, secondary pollution, Neng Gouyou are not produced in the desulfurization wastewater treatment system running
Inorganic ion, heavy metal ion in effect removal desulfurization wastewater.
According to another aspect of the present invention, the present invention further provides a kind of method for treating desulfurized wastewater, including following step
Suddenly：
Solid-liquid separation step, is delivered to waste-water vortex device 2 from desulfurizer 1 by desulfurization wastewater and carries out separation of solid and liquid processing,
To form underflow and overflow, wherein overflow solid content is not more than 1%；
Filtration step, is delivered to Sand Filtration System 3 by the overflow after being handled by waste-water vortex device 2 and is filtered, after filtering
Desulfurization wastewater solid content is less than 0.01%；
Heat exchange step, the desulfurization wastewater after filtering is delivered to the water inlet pipe 41 of chimney flue type heat exchanger 4, is opened first and is controlled
Valve 44 is so that desulfurization wastewater enters the heat exchanger components 42 of chimney flue type heat exchanger 4 and shunted, and desulfurization wastewater and high-temperature flue gas are changed
Heat, desulfurization wastewater heat absorption heating, high-temperature flue gas heat release cooling, wherein the first control valve 44 is connected to the water inlet pipe 41 and described
Between heat exchanger components 42；
Atomization steps, the desulfurization wastewater after heat exchange are delivered to the nozzle of supersonic atomizer 5, the cigarette after heat exchange cooling
Gas enters desulfurizer 1, and waste water is atomized into mist droplet by supersonic atomizer 5, produces electric anion；
Dust separation step, the desulfurization wastewater after atomization is sprayed into the inlet flue duct 61 of deduster 6, and the desulfurization after atomization is given up
Water is dried in the inlet flue duct 61 of deduster by high-temperature flue gas, and the inorganic salts in desulfurization wastewater are precipitated simultaneously and dust is in dedusting
It is removed in device 6, desulfurization wastewater is cleaned to form water vapour through removing inorganic salts, and water vapour is back to de- by deduster 6
Sulphur device 1.
Especially, solid-liquid separation step, filtration step, heat exchange step, atomization steps and dust separation step cycle are entered
OK, desulfurization wastewater is made to realize zero-emission after multipurpose processing.
The method for treating desulfurized wastewater further comprises the steps：
Cleaning, closes the first control valve 44, opens the second control valve 45 to run the water spray lattice of chimney flue type heat exchanger 4
Grid 43, desulfurization wastewater enters water spray grid 43 through water inlet pipe 41 and is sprayed onto heat exchanger components 42, so that heat exchanger components 42 are cleaned, wherein
Second control valve 45 is connected between water inlet pipe 41 and water spray grid 43.
In the cleaning, gas approach 11 of the water through desulfurizer 1 after cleaning flows into the desulfurization of desulfurizer 1
Tower, wherein desulfurizing tower gas approach, which have, to be angled downward.
The method for treating desulfurized wastewater further comprises the steps：
Spray cooling step, when desulfurizer 1 runs failure or flue-gas temperature is too high, opens first control
Valve 44 and second control valve 45 are to run the heat exchanger components 42 and the water spray grid 43 simultaneously, so that flue gas is while quilt
Spray cooling and heat exchange cool；
Amount of makeup water step, opens the 3rd control valve 8 being arranged on the water pipeline of the technique water tank of desulfurizer 1,
With from technique water tank amount of makeup water to chimney flue type heat exchanger 4.
It is understood that the function of chimney flue type heat exchanger 4 is desulfurization wastewater and high-temperature flue gas is exchanged heat.Chimney flue type
Heat exchanger 4 is in day-to-day operation, and desulfurization wastewater enters water inlet pipe 41 by three-way pipeline, opens positioned at the side of heat exchanger components 42
First control valve 44, closes the second control valve 45 for being located at water spray grid 43 side, desulfurization wastewater enter heat exchanger components 42 and and
High-temperature flue gas carries out heat exchange.When needing cleaning heat exchanger components 42, then on the contrary, closing the positioned at the side of heat exchanger components 42
One control valve 44, opens the second control valve 45 for being located at water spray grid 43 side, and desulfurization wastewater enters water spray grid 43 and is sprayed onto
Heat exchanger components 42 are to clean heat exchanger components 42.When the operation troubles of desulfurizer 1 or too high high-temperature flue-gas, open simultaneously
First control valve 44 and the second control valve 45, so that heat exchanger components 42 and water spray grid 43 are run simultaneously, are realized simultaneously to high temperature
Flue gas carries out spray cooling and heat exchange cools.
Whole process cycles process, realizes desulfurization wastewater zero-emission, and make desulfurization wastewater by multipurpose handling process
Recycling, does not produce secondary pollution, has a good application prospect.
It will be appreciated by those skilled in the art that the embodiments of the invention shown in foregoing description and accompanying drawing are only used as lifting
Example, is not intended to limit the present invention.The purpose of the present invention completely and is effectively realized.The function and structure principle of the present invention exists
In embodiment show and illustrate, in the case of without departing from the principle, embodiments of the present invention can have it is any deformation and
Modification.
Claims (9)
1. a kind of desulfurization wastewater treatment system, it is characterised in that including：
Desulfurizer；
Waste-water vortex device, is communicated in the desulfurizer, and the waste-water vortex device carries out separation of solid and liquid to desulfurization wastewater；
Sand Filtration System, is communicated in the waste-water vortex device, and the Sand Filtration System is filtered to desulfurization wastewater；
Chimney flue type heat exchanger, is communicated in the Sand Filtration System and positioned at the gas approach of the desulfurizer, desulfurization wastewater is in institute
State in chimney flue type heat exchanger and high-temperature flue gas is exchanged heat；
Supersonic atomizer, is communicated in chimney flue type heat exchanger and with nozzle, the supersonic atomizer is to desulfurization wastewater
Atomization process is carried out to form droplet；
Deduster, with inlet flue duct, the nozzle of the supersonic atomizer be installed in the inlet flue duct of the deduster with
The desulfurization wastewater after atomization is set to be sprayed onto the inlet flue duct of the deduster, the desulfurization wastewater of atomization is dried and analysed by high-temperature flue gas
Go out inorganic salt particle, inorganic salt particle enters the deduster and is removed.
2. desulfurization wastewater treatment system according to claim 1, it is characterised in that the Sand Filtration System includes filtration system
And backwashing system, the filtration system is for filtering desulfurization wastewater, and the backwashing system is for backwashing.
3. desulfurization wastewater treatment system according to claim 1, it is characterised in that the chimney flue type heat exchanger includes water inlet
Pipe, heat exchanger components and water spray grid, the water inlet pipe, the heat exchanger components and the water spray grid three interconnect,
The heat exchanger components are duct type heat exchanger components, and the water spray grid is located at the side of the heat exchanger components, the water spray grid
Towards and be directed at the heat exchanger components.
4. desulfurization wastewater treatment system according to claim 3, it is characterised in that the chimney flue type heat exchanger is further wrapped
The first control valve and the second control valve are included, first control valve is connected between the water inlet pipe and the heat exchanger components, institute
The second control valve is stated to be connected between the water inlet pipe and the water spray grid.
5. desulfurization wastewater treatment system according to claim 4, it is characterised in that the desulfurization wastewater treatment system enters one
Step include can pressurizing delivery pump, it is described can pressurizing delivery pump be connected to the waste-water vortex device and the chimney flue type heat exchanger it
Between, it is described can pressurizing delivery pump there is function of increasing pressure.
6. desulfurization wastewater treatment system according to claim 1, it is characterised in that the deduster is communicated in the desulfurization
Device, desulfurization wastewater purifies through removing inorganic salt particle and to form water vapour and be back to the desulfurizer.
7. a kind of method for treating desulfurized wastewater, it is characterised in that comprise the following steps：
Solid-liquid separation step, is delivered to waste-water vortex device from desulfurizer by desulfurization wastewater and carries out separation of solid and liquid processing, to be formed
Underflow and overflow, wherein overflow solid content are not more than 1%；
Filtration step, is delivered to Sand Filtration System by the overflow after being handled by the waste-water vortex device and is filtered, de- after filtering
Sulphur waste water solid content is less than 0.01%；
Heat exchange step, the desulfurization wastewater after filtering is delivered to the water inlet pipe of chimney flue type heat exchanger, open the first control valve so that
Desulfurization wastewater enters the heat exchanger components of the chimney flue type heat exchanger and shunting, and desulfurization wastewater and high-temperature flue gas are exchanged heat, desulfurization
Waste water heat absorption heating, cooling high-temperature fume, wherein the first control valve is connected between the water inlet pipe and the heat exchanger components；
Atomization steps, the desulfurization wastewater after heat exchange are delivered to the nozzle of supersonic atomizer, and the flue gas after heat exchange cooling is defeated
The desulfurizer is delivered to, desulfurization wastewater is atomized into small droplet by supersonic atomizer, produce electric anion；
Dust separation step, the desulfurization wastewater after atomization is sprayed into the inlet flue duct of deduster, desulfurization wastewater after atomization in except
Dried in the inlet flue duct of dirt device by high-temperature flue gas, the inorganic salts in desulfurization wastewater are precipitated and gone with dust in deduster
Remove, desulfurization wastewater is cleaned to form water vapour through removing inorganic salts, and water vapour is back to the desulfurizer by deduster.
8. method for treating desulfurized wastewater according to claim 7, it is characterised in that the method for treating desulfurized wastewater enters one
Step comprises the following steps：
Cleaning, closes the first control valve, opens the second control valve to run the water spray grid of the chimney flue type heat exchanger, takes off
Sulphur waste water enters the water spray grid through the water inlet pipe and is sprayed onto the heat exchanger components, so that the heat exchanger components are cleaned, its
Described in the second control valve be connected between the water inlet pipe and the water spray grid.
9. method for treating desulfurized wastewater according to claim 8, it is characterised in that the method for treating desulfurized wastewater enters one
Step comprises the following steps：
Spray cooling step, breaks down or when flue-gas temperature is too high when desulfurizer is run, open first control valve and
Second control valve to run the heat exchanger components and the water spray grid simultaneously, so that flue gas by spray cooling and is changed simultaneously
Heat drop temperature；
Amount of makeup water step, opens and is arranged at the 3rd control valve on the water pipeline of the technique water tank of desulfurizer, with from work
Skill water tank amount of makeup water is to chimney flue type heat exchanger.
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