CN109205909A - The processing system and method for coal-fired power station boiler flue gas desulfurization waste-water - Google Patents
The processing system and method for coal-fired power station boiler flue gas desulfurization waste-water Download PDFInfo
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- CN109205909A CN109205909A CN201811358055.4A CN201811358055A CN109205909A CN 109205909 A CN109205909 A CN 109205909A CN 201811358055 A CN201811358055 A CN 201811358055A CN 109205909 A CN109205909 A CN 109205909A
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Classifications
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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
-
- 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
- C02F1/048—Purification of waste water by evaporation
-
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The present invention provides the processing system and method for a kind of coal-fired power station boiler flue gas desulfurization waste-water, including successively handles through gas explosion settling tank, concentration and settlement device, concentration regulating box and fluidized-bed water gas gasifier；The gas explosion settling tank, for desulfurization wastewater to be isolated sediment and supernatant；The concentration and settlement device, for the supernatant to be condensed into slurries and condensing recovery water；The concentration regulating box, for the concentrated slurry and flying dust to be blended into mortar；The fluidized-bed water gas gasifier, for the mortar to be sulfided into tiny pellet object, and before sending to air preheater, flue is trapped.The present invention is generated using different pH value zonal control sediments, is concentrated using flue gas waste heat, the final classified utilization recycling for realizing desulfurization wastewater.
Description
Technical field
The present invention relates to the processing system and method for a kind of coal-fired power station boiler flue gas desulfurization waste-water, specially a kind of fire coal
The processing system of flue gas in power station boiler desulfurization wastewater is mainly used for the processing of thermal power plant desulfurization wastewater, belongs to thermal power plant
Environmental protection technical field.
Background technique
Coal is as non-renewable energy, the SO that generates in combustion process2It is one of important Air Pollutants.It builds thus
A large amount of lime stone gypsum wet flue gas desulfurizing facility, for the waste water that these desulfurization equipments generate in acidity, solid content is low (in 1-
2%), main component is dust and desulfurizing byproduct (calcium sulfate and calcium sulfite), also containing soluble chloride and nitrous acid
Salt etc. and heavy metal ion.
Currently, the processing mode taken to these waste water is mainly using physico-chemical process, it may be assumed that add alkali, acid adding,
It neutralizes, the processing of flocculated method, by solid waste filters pressing therein at being used as fixed-end forces after filter cake.These technical matters streams
Journey is long, takes up a large area, and investment and operating cost are high, and the clarification time is long, and national standard is often not achieved after purification of waste water, runs
In blender, mud scraper high failure rate, maintenance is difficult, and the solid waste of generation has certain content of beary metal, difficult
With disposition.
Summary of the invention
In view of the problems of the existing technology the present invention, provides a kind of processing system of coal-fired power station boiler flue gas desulfurization waste-water
System.
Another object of the present invention is to provide a kind of method for handling coal-fired power station boiler flue gas desulfurization waste-water.
The specific technical solution of the present invention is as follows:
A kind of processing system of coal-fired power station boiler flue gas desulfurization waste-water, including sequentially connected gas explosion settling tank, concentration and settlement
Device, concentration regulating box and fluidized-bed water gas gasifier；
The gas explosion settling tank, for desulfurization wastewater to be isolated sediment and supernatant；
The concentration and settlement device, for the supernatant to be condensed into slurries and condensing recovery water；
The concentration regulating box, for the concentrated slurry and flying dust to be blended into mortar；
The fluidized-bed water gas gasifier, for the mortar to be sulfided into tiny pellet object, and before sending to air preheater, flue is trapped.
Preferred design of the present invention is that the concentration and settlement device is divided into three parts, and top is gas cavity, and middle part setting is changed
Hot device, lower part are sedimentation chamber；The gas outlet of the gas cavity is successively connected to gas through condenser, heat exchanger tube and circulating fan
The air inlet of cavity, forming circuit.
Preferred design of the present invention is that first heat exchanger tube is arranged in house outlet flue；The heat exchanger tube
Heat absorbing end is arranged in house outlet flue.
Preferred design of the present invention is that the condensed water of the condenser is recycled by condensation water tank；The concentration and settlement device is set
It sets heat exchanger position and is additionally provided with ultrasonator；Agitating device is arranged in concentration regulating box.
Preferred design of the present invention is, filler is equipped in the fluidized-bed water gas gasifier, before top is connected to air preheater by the road
Flue, bottom connect heated air source by the road；Wherein filler uses diameter green for the silica of 3-10mm, molecular sieve or violet
Stone.
A method of processing coal-fired power station boiler flue gas desulfurization waste-water, method includes the following steps:
1) desulfurization wastewater inputs gas explosion settling tank, blasts air to gas explosion settling tank upper layer and carries out gas explosion, isolated sediment is extremely
Sewage treatment case, isolated supernatant to concentration and settlement device；
2) it being heated into the supernatant of concentration and settlement device by heat exchanger, the aqueous vapor for being evaporated to top is recycled by condenser,
The concentrated slurry for being settled down to lower part is sent to concentration regulating box；
3) concentration regulating box blends the concentrated slurry and flying dust, is mixed into the mortar that solid content is 40%-70% and send to fluidisation
Bed evaporator；
4) it to fluidized-bed water gas gasifier bottom input hot-air, after the mortar is sulfided into tiny pellet object, then send to air preheater
Preceding flue, is trapped by sack cleaner.
Preferred design of the present invention is, in step 1), adjusts in gas explosion settling tank pH value of waste water to 4.5-6；In step 2,
Slurry pH value is adjusted in concentration and settlement device to 8-12.
Preferred design of the present invention is, in step 1) and step 2, adjusts pH value and uses lime, sodium carbonate, sodium sulfite
Or potassium carbonate.
Preferred design of the present invention is, in step 2, control concentration and settlement device in slurry temperature in 45-60 DEG C of range, and
It can carry out ultrasonication.
Preferred design of the present invention is, in step 4), filler uses diameter for the dioxy of 3-10mm in fluidized-bed water gas gasifier
SiClx, molecular sieve or cordierite；The heat source of the hot-air is using the sky after power plant's First air, Secondary Air or heat source gas heating
Gas controls fluidized-bed temperature in 110-140 DEG C of range.
The present invention has the following beneficial effects: compared with prior art
1, the present invention is generated using different pH value zonal control sediments, is concentrated using flue gas waste heat, and final realization is de-
The classified utilization of sulphur waste water recycles.
2, the present invention devises concentration and settlement device and fluidized-bed water gas gasifier.Condition of the desulfurization wastewater in the pH value section of control
Lower progress gas explosion sedimentation, is then added in concentration and settlement device, and settler top is by pipe heat exchanger, from house outlet cigarette
Road heat exchange controls slurry temperature, and the water after evaporation is recycled by condenser, realizes substantially innoxious time of condensed water
It receives.
3, the flying dust tune of part deduster collection is added by the underflow of concentration and settlement device in concentration adjusting tank by the present invention
Whole solid content, and further increase pH value (deduster flying dust in alkalinity), finally enter fluidized-bed water gas gasifier using hot-air into
Row evaporation, the particulate matter after evaporation can be sent into the flue before air preheater, be recycled by deduster, not influence to recycle flying dust again
It utilizes.Also, the particulate matter after evaporating is agglomerated particle, and alkalinity is higher than original flying dust can be right during smoke movement
The original ash surface of flue gas generates quenched effect, reduces ash surface stickiness, and air preheater obstruction risk is effectively reduced.
Detailed description of the invention
Fig. 1 is the processing system figure of one coal-fired power station boiler flue gas desulfurization waste-water of the embodiment of the present invention；
In figure: 1- waste water water source；2- gas explosion settling tank；3- concentration and settlement device；4- concentration adjusting tank；5- deduster flying dust source；6-
Heated air source；7- fluidized-bed water gas gasifier；Flue before 8- air preheater；9- pipe heat exchanger；10- house outlet flue；11- condensation
Device；12- return water tank；13- cooling cycle blower；14- Sewage treatment case.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
As shown in Figure 1, the processing system of coal-fired power station boiler flue gas desulfurization waste-water of the invention, including successively through gas explosion settling tank
2, concentration and settlement device 3, concentration regulating box 4 and fluidized-bed water gas gasifier 7.
Waste water water source 1 is first passed through gas explosion settling tank 2, enters concentration and settlement device 3 by gas explosion settling tank 2, concentration and settlement device 3 divides
For three parts, top is gas cavity, and pipe heat exchanger 9 is arranged in middle part, and lower part is sedimentation chamber.The release end of heat of pipe heat exchanger 9
It is arranged in the middle part of concentration and settlement device, heat absorbing end is arranged in heat source side.The gas outlet of gas cavity is successively through condenser 11, heat exchanger tube
It is connected to the air inlet of gas cavity with circulating fan 13, and is formed into a loop, blow valve, safety valve etc. can be also equipped in circuit.
Desulfurization wastewater is isolated sediment and supernatant by gas explosion settling tank 2；Supernatant concentration is slurried concentration and settlement device 3
Liquid and condensing recovery water；Concentrated slurry and flying dust from dedusting flying dust source 5 are blended into mortar by concentration regulating box 4；Fluidized bed
Evaporator 7 evaporates mortar, forms tiny pellet object in a fluidized bed, and flue 8 before sending to air preheater, traps through deduster.
Spherical porous aggregate is equipped in fluidized-bed water gas gasifier 7, top is connected to flue before air preheater by the road, and bottom is by the road
Heated air source 6 is connected, hot-air is blasted by fluidized-bed bottom.Filler uses diameter for the two of 3-10mm in fluidized-bed water gas gasifier
Silica, molecular sieve or cordierite.
Embodiment two:
The further design of this example is that heat exchanger tube is arranged in house outlet flue 10, absorbs heat water supply in flue
Gas lift temperature, or use other heat sources.
Embodiment three:
The further design of this example is that condenser 11 is also configured with the recycling of condensation water tank 12, condenses out to recycle
Water；Agitating device is arranged in concentration regulating box 4, is mixed admittedly with sufficiently adjusting liquid.Furthermore it is also possible to which liquid level, solid content monitoring is arranged
Device etc..
Example IV:
The further design of this example is that ultrasonator is arranged in the middle part of concentration and settlement device 3, and ultrasonator is located at tubular type and changes
In the gap of heat pipe release end of heat or it is arranged in around pipe type heat transfer pipe release end of heat.
Embodiment five:
The method that the present invention handles coal-fired power station boiler flue gas desulfurization waste-water, specific embodiment are as follows:
1, desulfurization wastewater is passed through in gas explosion settling tank, and controlling pH value in pond, if pH value is too low, can pass through addition 5.5 or so
Lime adjusts pH value, blasts air on gas explosion settling tank upper layer and carries out gas explosion, the particulate matter in lower liquid passes through natural subsidence
It is recycled, clarified solution enters concentration and settlement device.
2, adjust pH value to 8 or more by the way that basic species are added to concentration and settlement device, basic species can be used lime, sodium carbonate,
Sodium sulfite, potassium carbonate etc..The gas cavity on concentration and settlement device top is followed with cooling herein for accommodating the vapor of evaporation
Ring blower blasts the hot wind heated by flue, and vapor is sent into condenser, is recycled after water condensation therein, condensed
Air enters the heat exchanger tube in flue, returns to gas cavity after heating；Heat release of the middle section in liquid level heat exchanger arranged below
End, using water as medium, heat absorbing end exchanges heat after absorbing heat from house outlet flue with slurries herein, controls slurries
For temperature in 45-60 DEG C of range, lower part is settling zone, and in this region particle agglomeration occurs for the slurries after concentration, generates larger
Enter concentration adjusting tank after grain sediment.Ultrasonic oscillation device is set in the gap of heat exchanger release end of heat, opens vibration and is used for
Prevent fouling of heat exchangers；
3, the flying dust of part house outlet is added in concentration adjusting tank, solid content concentration is adjusted to 50% or so and is delivered to stream
Change bed evaporator.
4, spherical porous aggregate, diameter 3-10mm are set inside fluidized-bed water gas gasifier, and material can be used silica, divide
Sub sieve, cordierite etc. input hot-air from fluidized-bed bottom, heated air source can be power plant's First air, Secondary Air or other add
Air after heat, control fluidized-bed temperature is in 110-140 DEG C of range, ball filler formation fluidized bed under the blowing of hot-air,
The slurries of concentration are sprayed into fluidized bed lower part, the solidification of ball filler dry tack free are sprayed at, during fluidized bed motion collision
Broken to form fine particle and take out of with air-flow, flue before these last particulate matters are sent to air preheater is mixed into flying dust in deduster
It recycles.
Claims (10)
1. a kind of processing system of coal-fired power station boiler flue gas desulfurization waste-water, it is characterised in that: heavy including sequentially connected gas explosion
Pond, concentration and settlement device, concentration regulating box and fluidized-bed water gas gasifier drop；
The gas explosion settling tank, for desulfurization wastewater to be isolated sediment and supernatant；
The concentration and settlement device, for the supernatant to be condensed into slurries and condensing recovery water；
The concentration regulating box, for the concentrated slurry and flying dust to be blended into mortar；
The fluidized-bed water gas gasifier, for the mortar to be sulfided into tiny pellet object, and before sending to air preheater, flue is trapped.
2. the processing system of coal-fired power station boiler flue gas desulfurization waste-water according to claim 1, it is characterised in that:
The concentration and settlement device is divided into three parts, and top is gas cavity, and heat exchanger is arranged in middle part, and lower part is sedimentation chamber；It is described
The gas outlet of gas cavity is successively connected to the air inlet of gas cavity through condenser, heat exchanger tube and circulating fan, forming circuit.
3. the processing system of coal-fired power station boiler flue gas desulfurization waste-water according to claim 2, it is characterised in that: described first
Heat exchanger tube is arranged in house outlet flue；The heat absorbing end of the heat exchanger tube is arranged in house outlet flue.
4. the processing system of coal-fired power station boiler flue gas desulfurization waste-water according to claim 3, it is characterised in that: the condensation
The condensed water of device is recycled by condensation water tank；Concentration and settlement device setting heat exchanger position is additionally provided with ultrasonator；Concentration
Agitating device is arranged in regulating box.
5. the processing system of coal-fired power station boiler flue gas desulfurization waste-water according to claim 3, it is characterised in that: the fluidisation
It is equipped with filler in bed evaporator, top is connected to flue before air preheater by the road, and bottom connects heated air source by the road；Wherein filler
Use diameter for the silica of 3-10mm, molecular sieve or cordierite.
6. the method for any institute's system processing coal-fired power station boiler flue gas desulfurization waste-water of claim 1-5, this method includes following
Step:
1) desulfurization wastewater inputs gas explosion settling tank, blasts air to gas explosion settling tank upper layer and carries out gas explosion, isolated sediment is extremely
Sewage treatment case, isolated supernatant to concentration and settlement device；
2) it being heated into the supernatant of concentration and settlement device by heat exchanger, the aqueous vapor for being evaporated to top is recycled by condenser,
The concentrated slurry for being settled down to lower part is sent to concentration regulating box；
3) concentration regulating box blends the concentrated slurry and flying dust, is mixed into the mortar that solid content is 40%-70% and send to fluidisation
Bed evaporator；
4) it to fluidized-bed water gas gasifier bottom input hot-air, after the mortar is sulfided into tiny pellet object, then send to air preheater
Preceding flue, is trapped by sack cleaner.
7. in step 1), it is heavy to adjust gas explosion for the method for handling coal-fired power station boiler flue gas desulfurization waste-water according to claim 6
PH value of waste water drops in pond to 4.5-6；In step 2, slurry pH value is adjusted in concentration and settlement device to 8-12.
8. the method for handling coal-fired power station boiler flue gas desulfurization waste-water according to claim 7 in step 1) and step 2, is adjusted
It saves pH value and uses lime, sodium carbonate, sodium sulfite or potassium carbonate.
9. the method for handling coal-fired power station boiler flue gas desulfurization waste-water according to claim 6, in step 2, control concentration is heavy
Slurry temperature is in 45-60 DEG C of range in drop device, and can carry out ultrasonication.
10. the method for handling coal-fired power station boiler flue gas desulfurization waste-water according to claim 6, in step 4), fluidized bed steams
Filler uses diameter for the silica of 3-10mm, molecular sieve or cordierite in hair device；The heat source of the hot-air uses power plant
Air after First air, Secondary Air or heat source gas heating, controls fluidized-bed temperature in 110-140 DEG C of range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358055.4A CN109205909B (en) | 2018-11-15 | 2018-11-15 | System and method for treating flue gas desulfurization wastewater of coal-fired power plant boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358055.4A CN109205909B (en) | 2018-11-15 | 2018-11-15 | System and method for treating flue gas desulfurization wastewater of coal-fired power plant boiler |
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| CN109205909B CN109205909B (en) | 2023-08-29 |
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Cited By (2)
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| CN110255805A (en) * | 2019-07-29 | 2019-09-20 | 湖南三分地环保信息科技有限公司 | A kind of recovery method of low concentration acid and low concentration valuable element waste liquid |
| CN112301224A (en) * | 2019-08-02 | 2021-02-02 | 江苏华久特钢工具有限公司 | Grinding wheel ash tungsten-molybdenum alloy extraction technology and equipment thereof |
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| CN109205909B (en) | 2023-08-29 |
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