CN111252993A - System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat - Google Patents
System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat Download PDFInfo
- Publication number
- CN111252993A CN111252993A CN202010217666.8A CN202010217666A CN111252993A CN 111252993 A CN111252993 A CN 111252993A CN 202010217666 A CN202010217666 A CN 202010217666A CN 111252993 A CN111252993 A CN 111252993A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- flue
- inlet
- tower
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- 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
- 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
Abstract
The invention discloses a system and a method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, which solve the problems that the traditional multiple-effect and MVR evaporation technology needs to increase the amount of medicament pretreatment, the high-temperature flue gas waste heat treatment technology needs to consume effective heat and has influence on a rear-end system and the like. The invention has the advantages of simple flow structure, easy operation, no influence on other systems, utilization of the waste heat of the raw flue gas before desulfurization to achieve the purpose of treating waste with waste to realize zero discharge of waste water and the like.
Description
Technical Field
The invention relates to the field of flue gas desulfurization wastewater treatment, in particular to a system and a method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat.
Background
At present, domestic flue gas desulfurization can be divided into three major categories, namely a wet method, a semi-dry method and a dry method, wherein the limestone-gypsum wet flue gas desulfurization process has the advantages of high desulfurization efficiency, high operation reliability, wide applicable coal range, high utilization rate of an absorbent, high equipment operation rate, low price and easy availability of the absorbent and the like, is the most widely applied and technically mature SO2 removal technology in the world at present, and accounts for about 90% of the capacity of an installed FGD unit.
The desulfurization wastewater refers to wastewater generated by limestone-gypsum wet desulfurization. The desulfurization wastewater treatment is a great problem of coal-fired power plants in power plants at present, and various treatment methods have many problems at present:
the desulfurization waste water has complex components, contains a large amount of salt-dissolving ions and solid matters, and is difficult to purify. And the traditional triple-header treatment technology needs to add hydrated lime, the generated water only removes most of solid and partial sulfate ions, and the generated water contains a large amount of dissolved salt ions, such as chloride ions, magnesium ions, sulfate ions and other ions.
The multiple-effect and MVR evaporation technologies need to pretreat the desulfurization wastewater, consume a large amount of hydrated lime and sodium carbonate, generate a large amount of mud cakes, obtain a small amount of sodium chloride, hardly ensure the qualification rate of the sodium chloride, and have the risk of scaling and blocking an evaporator.
Later, a technology for evaporating desulfurization wastewater by using waste heat of high-temperature flue gas appears, but the technology needs to consume effective heat of a boiler at present, the coal consumption of power generation is increased, and in addition, the technology is easy to block and corrode, and a rear-end dust remover can have certain influence on the quality of fly ash.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention aims to provide a system and a method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, which solve the problem of treatment of desulfurization wastewater.
The invention is realized by the following technical scheme:
the utility model provides an utilize system of flue gas waste heat evaporation concentration desulfurization waste water, includes the concentrated tower, the concentrated tower is provided with flue gas entry, exhanst gas outlet, filtrating entry and waste water entry, flue gas entry and exhanst gas outlet all are connected with quoting the flue, the concentrated tower is inside to be provided with and to spray the layer, is provided with the circulating pump outside the concentrated tower, the one end of circulating pump and the circulation liquid exit linkage of concentrated tower, the other end of circulating pump with spray the layer intercommunication, the filtrating entry is located spray between layer and the circulation liquid export, concentrated tower bottom is provided with the thick liquids export.
The invention dehydrates the discharged thick slurry, the obtained filtrate enters the concentration tower through the filtrate inlet and participates in circulation, evaporation concentration is carried out again, the filtrate inlet is positioned between the spraying layer and the circulating liquid outlet, after the filtrate enters the concentration tower, the filtrate does not immediately participate in spraying, but reaches the bottom of the concentration tower for sedimentation, part of the suspended matters or salts which are not filtered out are distributed to the bottom of the concentration tower to be used as part of thick slurry, and the upper-layer liquid enters a spraying layer through a circulating pump for spraying, then exchanges heat with the waste heat smoke, and is concentrated and evaporated again, compared with the way that the filtrate directly enters the spraying layer, the amount of the slurry participating in the circulating evaporation can be reduced, the heat consumption is reduced, and the solid matters in the filtrate can be reduced from entering the pipeline and the spraying layer after being settled and then participate in the circulation, so that the scaling of the pipeline and the spraying layer is reduced. In addition, the filtrate conveying is carried out intermittently, the circulating pump runs continuously, when the filtrate pump is not started, the filtrate pipe is directly connected with the circulating slurry pipe, so that the circulating slurry flows back to the filtrate pipeline to enter the filtrate tank, and the filtrate pump can also reverse and easily damage the pump body, so that the filtrate directly enters the concentration tower.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, which further comprises a thick slurry tank and a dehydrator, wherein the thick slurry tank is respectively connected with the slurry outlet and the dehydrator, and the dehydrator is connected with the filtrate inlet.
Further, a stirring device is arranged in the thick slurry tank and used for stirring the thick slurry.
The desulfurization wastewater in the concentration tower can form thick slurry in the concentration tower after evaporation and concentration, and the thick slurry box is used for collecting the thick slurry and stirring to prevent the precipitate from hardening.
According to the system for evaporating and concentrating the desulfurization wastewater by using the waste heat of the flue gas, the conditioning box is further arranged between the thick slurry box and the dehydrator and used for adjusting the pH value of the thick slurry participating in dehydration, specifically, the pH value is adjusted to be more than 2, on one hand, the acidity of the slurry can be weakened, corrosion is reduced, on the other hand, the filtrate with the increased pH value is easier to settle and layer after reaching the concentration tower, the solid content of the slurry entering the spraying layer for spraying is reduced, the circulation quantity and the heat exchange quantity are reduced, and the energy consumption is saved.
Furthermore, the waste water inlet is connected with a waste water tank for caching the desulfurization waste water discharged by the desulfurization system.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, wherein the position of a wastewater inlet is lower than the liquid level in the concentration tower.
The waste water does not directly participate in spraying, but firstly enters the bottom of the bottom concentration tower for certain sedimentation, partial solid matters in the waste water are precipitated to the bottom of the concentration tower to be used as part of thick slurry, the upper-layer liquid enters the spraying layer through the circulating pump for spraying, then carries out heat exchange with waste heat smoke, and is concentrated and evaporated. In addition, the waste water conveying is carried out intermittently, the circulating pump runs continuously, when the waste water pump is not started, the waste water pipe is directly connected with the circulating slurry pipe, circulating slurry flows back to the waste water pipe to enter the waste water tank, the waste water pump can also be reversed, and the pump body is easy to damage, so that the waste water directly enters the concentration tower.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, wherein a flue gas inlet is positioned on the side wall of a concentration tower and below a spraying layer, a flue gas outlet is positioned at the top of the concentration tower, and a demister is also arranged at the inner top of the concentration tower and positioned above the spraying layer.
The flue gas entry is under, the exhanst gas outlet is last with spraying the layer, after the flue gas enters into the concentration tower like this, can form the hot gas flow from bottom to top, flow direction opposite with the vaporific thick liquid that sprays the layer and spout down, form the contact against the current, contact the heat transfer more abundant, at the in-process of contact, evaporate the moisture in the thick liquid through the flue gas waste heat, evaporating water and flue gas get rid of the liquid drop through the defroster, insert in the absorption tower flue, reentry in the desulfurization system absorption tower, the contact against the current is more abundant, promote the effect of flue gas waste heat to the moisture in the thick liquid, further improvement availability factor, and the exhanst gas outlet at the concentration tower top is installed to the defroster, detach most liquid drop of wet flue gas, it causes the salt circulation to.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, wherein a flue gas inlet is connected with a reference main flue through an inlet flue, a flue gas outlet is connected with the reference main flue through an outlet flue, the inlet flue is also provided with a booster fan, and flue gas of the reference main flue is pressurized in the inlet flue through the booster fan and then is sent into a concentration tower.
The booster fan can improve the wind pressure for the flue gas can enter into the heat transfer in the concentration tower smoothly and will saturate the wet flue gas and send back to the flue stack.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, wherein the filtrate inlet is positioned on the opposite side of the circulating liquid outlet and below the flue gas inlet, and the filtrate inlet is lower than the liquid level in the concentration tower.
After the filtrating gets into the concentration tower, because the filtrating entry is in the offside of circulation liquid export, before the filtrating participates in the circulation, the filtrating has the time of equivalent and deposits earlier, and because the pH value of filtrating is higher, changes and takes place the sediment, moreover, because the filtrating entry is located below the concentration tower inner liquid level, the filtrating gets into afterwards, can not contact with the flue gas, the acidity of flue gas can not exert an influence to the PH of filtrating, makes it keep higher pH value better.
Furthermore, the bottom of the concentration tower is in a cone shape, so that solid matters after concentration can be conveniently precipitated at the bottom, thick slurry is discharged, and the filtrate is more easily precipitated at the cone bottom after entering the concentration tower, so that the amount of liquid participating in evaporation and concentration is reduced.
Further, the waste water inlet is connected with a waste water tank, the waste water tank is connected with a desulfurization system, and the waste water tank is used for caching waste water.
The invention preferably discloses a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, wherein the inlet flue is provided with a first baffle door, the first baffle door is used for isolating the inlet flue gas of the system, the outlet flue is provided with a second baffle door, and the second baffle door is used for isolating the outlet flue gas of the system.
A method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat comprises the following steps:
step 1: flue gas and waste water enter a tower for heat exchange, evaporation and concentration of waste water
Flue gas enters the concentration tower through an inlet flue and moves from bottom to top, upper liquid of wastewater settled at the bottom of the concentration tower enters a spraying layer through a circulating pump and moves downwards by spraying into an atomized state, and the upper liquid contacts with the flue gas flowing upwards in a counter-current manner to exchange heat and evaporate, so that concentrated wastewater is concentrated to obtain thick slurry;
step 2: discharging thick slurry
Discharging the thick slurry from the concentration tower to a thick slurry box;
and step 3: adjusting the pH value
Conveying the thick slurry in the thick slurry box to a tempering box, and adding an alkaline substance to adjust the pH value to be more than 2;
and 4, step 4: dewatering
And conveying the thick slurry in the quenching and tempering box to a dehydrator for dehydration, and returning the dehydrated filtrate to the bottom of the concentration tower through a filtrate inlet to continuously participate in evaporation concentration.
Preferably, the filtrate is settled and layered after being returned to the concentration tower, and the upper layer slurry is conveyed to the spraying layer through a circulating pump for spraying, so that the circulating heat exchange concentration is realized.
Further, the alkaline substance for adjusting the pH value is one of fly ash, hydrated lime, caustic soda or other alkaline substances.
Further, the PH is 2 or more.
The desulfurization wastewater contains solid suspended matters, sulfate, heavy metals and the like, the collected dense slurry is added with alkaline substances to adjust the pH value, the state of the solid suspended matters is broken through adding the alkaline substances, so that the solid suspended matters are easier to settle and stratify, the added alkaline substances react with heavy metal ions and the like in the dense slurry to generate hydroxide precipitates with low solubility, solid-liquid separation can be better carried out in the later dehydration process, the solid suspended matters, the salts and the like remained in filtrate can enter a concentration tower along with the filtrate, the slurry at the bottom of the concentration tower is better settled and stratified due to the higher pH value, the slurry with high solid content at the lower layer is discharged as the dense slurry, the slurry at the upper layer is circularly evaporated, the amount of the slurry participating in evaporation is reduced, the heat consumption is saved, and the treatment efficiency is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, through adjusting the pH value of the thick slurry and reasonably setting the positions of the filtrate inlet and the flue gas inlet, the filtrate is fully settled in the circulating evaporation concentration process, so that the zero emission of the wastewater is realized, the heat consumption is saved, and the treatment efficiency is improved.
2. The invention does not need to pretreat the wastewater, thereby having strong adaptability to the quality of the wastewater; meanwhile, the system is simple to operate and has no influence on the operation of the host.
3. The heat of the waste water evaporation used by the invention comes from the low-temperature flue gas in front of the desulphurization device, the heat of the flue gas is lost by evaporating water in the desulphurization tower, the heat has no recycling value and belongs to waste heat, but the heat is utilized by the invention to prepare waste from waste, so the running cost of the whole system is the plant power consumption, and the running cost is lower.
4. The water vapor enters the desulfurizing tower along with the flue gas after the waste water is evaporated, the temperature of the flue gas is reduced, the water consumption of a desulfurizing system is correspondingly reduced, and the demister is arranged at the top in the concentrating tower to intercept corrosive liquid drops, so that negative effects on other systems such as a boiler main flue, the desulfurizing system and the like can be avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a system diagram of the present invention.
Reference numbers and corresponding part names in the drawings:
1-a wastewater tank, 2-a concentration tower, 3-a flue gas inlet, 4-a flue gas outlet, 5-a spray layer, 6-a circulating pump, 7-a booster fan, 8-a first baffle door, 9-a guide flue, 10-a second baffle door, 11-an inlet flue, 12-an outlet flue, 13-a slurry outlet, 14-a thick slurry tank, 15-a tempering tank, 16-a dehydrator, 17-a filtrate inlet, and 18-a wastewater inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, a system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat comprises a concentration tower 2, wherein the concentration tower 2 is provided with a flue gas inlet 3, a flue gas outlet 4, a filtrate inlet 17 and a wastewater inlet 18, the flue gas inlet 3 and the flue gas outlet 4 are both connected with a reference main flue 9, a spray layer 5 is arranged inside the concentration tower 2, a circulating pump 6 is arranged outside the concentration tower 2, one end of the circulating pump 6 is connected with a circulating liquid outlet of the concentration tower 2, the other end of the circulating pump 6 is communicated with the spray layer 5, the filtrate inlet 17 is located between the spray layer 5 and the circulating liquid outlet, a slurry outlet 13 is arranged at the bottom of the concentration tower 2, a thick slurry tank 14 is connected below the slurry outlet 13 and used for collecting thick slurry discharged from the bottom of the concentration tower 2, and a stirring device is arranged in the thick slurry tank 14 and used for stirring the thick slurry to prevent the thick slurry from precipitating, the thick pulp box 14 is connected with a dehydrator 16, the dehydrator 16 is connected with a filtrate inlet 17, thick pulp is dehydrated by the dehydrator 16 after the pH value is adjusted, and filtrate generated by dehydration returns to the bottom of the concentration tower 2 through the filtrate inlet 17.
Example 2
The difference between this embodiment and embodiment 1 lies in, thick liquid case 14 with still be provided with quenching and tempering case 15 between hydroextractor 16, quenching and tempering case 15 is used for carrying out the pH value to the thick liquid of participating in the dehydration and adjusts, specifically, adopts fly ash to adjust the pH value to more than 2, can weaken the acidity of thick liquid on the one hand, reduces the corruption, and the mud cake can not become dangerous waste, and on the other hand, the filtrating that the pH value rised is changeed and is subsided the layering after reaching concentration tower 2, reduces the solid content that gets into the thick liquid that sprays 5 sprays in the layer, reduces circulation volume and heat transfer volume, energy saving consumption.
Example 3
The difference between the embodiment and the embodiment 2 is that the flue gas inlet 3 is located on the side wall of the concentration tower 2 and below the spray layer 5, the flue gas inlet 3 is located above the opposite side of the filtrate inlet 17, the flue gas inlet 3 is connected with the citing main flue 9 through the inlet flue 11, the flue gas outlet 4 is connected with the citing main flue 9 through the outlet flue 12, the inlet flue 11 is provided with a first baffle door 8, the first baffle door 8 is used for isolating the system inlet flue gas, a booster fan 7 is further arranged between the first baffle door 8 and the flue gas inlet 3, the flue gas citing the main flue 9 is sent to the interior of the concentration tower 2 after being pressurized in the inlet flue 11 by the booster fan 7, the flue gas outlet 4 is located at the top of the concentration tower 2, the outlet flue 12 is provided with a second baffle door 10, the second baffle door 10 is used for isolating the system outlet flue gas, the inner top of the concentration tower 2 is also provided with a demister, and the demister is positioned above the spraying layer 5.
The flue gas entry 3 is down, the exhanst gas outlet 4 is last with spraying layer 5, after the flue gas enters into the concentration tower 2 like this, can form the hot gas flow from bottom to top, flow direction with the vaporific thick liquid that sprays layer 5 and spout down is opposite, form the contact against the current, the contact heat transfer is more abundant, in the in-process of contact, evaporate the moisture in the thick liquid through the flue gas waste heat, evaporating water and flue gas get rid of the liquid drop through the defroster, insert in the absorption tower flue, reentrant in the desulfurization system absorption tower, the contact against the current is more abundant, promote the effect of flue gas waste heat to the moisture in the thick liquid, further improvement availability factor, and the exhanst gas outlet 4 department at concentration tower 2 top is installed to the defroster, detach the liquid drop of wet flue gas.
The filtrate inlet 17 is positioned at the opposite side of the circulating liquid outlet and below the flue gas inlet 3, and the position of the filtrate inlet 17 is lower than the liquid level in the concentration tower 2.
After the filtrating gets into concentration tower 2, because filtrating entry 17 is in the contralateral side of circulation liquid export, before the filtrating participates in the circulation, the filtrating has the time earlier to deposit, and because the pH value of filtrating is higher, more easily takes place the sediment, moreover, because filtrating entry 17 is located concentration tower 2 internal liquid level below, after the filtrating gets into, can not contact with the flue gas, the acidity of flue gas can not exert an influence to the PH of filtrating, makes it keep higher pH value better.
The bottom of the concentration tower 2 is in a cone shape, so that solid matters after concentration can be conveniently precipitated at the bottom, thick slurry is discharged, and the filtrate is more easily precipitated at the cone bottom after entering the concentration tower 2, and the amount of liquid participating in evaporation concentration is reduced.
Example 4
The difference between the embodiment and the embodiment 3 is that the wastewater inlet 18 is connected with the wastewater tank 1, the wastewater tank 1 is connected with a desulfurization system, the wastewater tank 1 is used for buffering wastewater, the wastewater inlet 18 is located between the spray layer 5 and the filtrate inlet 17, the wastewater does not directly participate in spraying, but goes to the bottom of the bottom concentration tower 2 for certain sedimentation, part of solid matters in the wastewater are precipitated to the bottom of the concentration tower 2 as part of concentrated slurry, and the upper layer liquid enters the spray layer 5 through the circulating pump 6 for spraying, then exchanges heat with the residual heat flue gas, is concentrated and evaporated, compared with the case that the wastewater directly enters the spray layer 5, the amount of slurry participating in circulating evaporation can be reduced, the heat consumption is reduced, and part of solid matters in the wastewater can be reduced to enter the pipeline and the spray layer 5 through sedimentation and then participate in circulation, reducing the scaling of the pipeline and the spraying layer 5.
Example 5
This embodiment differs from embodiment 4 in that the thick stock tank 14 is connected to a drying device and the thick stock is not dewatered but directly subjected to a drying process.
Example 6
A method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat comprises the following steps:
step 1: flue gas and waste water enter a tower for heat exchange, evaporation and concentration of waste water
Flue gas enters a concentration tower 2 through an inlet flue 11 and moves from bottom to top, upper-layer liquid of wastewater settled at the bottom of the concentration tower 2 enters a spraying layer 5 through a circulating pump 6 and moves downwards in an atomized state through spraying, and the wastewater is contacted with the flue gas flowing upwards in a counter-current manner to exchange heat and evaporate, and the concentrated wastewater is concentrated into thick slurry which is 5-25 times of the original liquid;
step 2: discharging thick slurry
Discharging the thick slurry from the concentration tower 2 to a thick slurry tank 14;
and step 3: adjusting the pH value
Conveying the thick slurry in the thick slurry box 14 to a tempering box 15, and adding fly ash or hydrated lime to adjust the PH to be more than 2;
and 4, step 4: dewatering
The thick slurry in the tempering box 15 is conveyed to a dehydrator 16 for dehydration, and the dehydrated filtrate returns to the bottom of the concentration tower 2 through a filtrate inlet 17 to continuously participate in evaporation concentration.
And after the filtrate returns to the concentration tower 2, the filtrate is firstly settled and layered, and then the upper layer of slurry is conveyed to the spraying layer 5 through the circulating pump 6 for spraying, so that the circulating heat exchange concentration is realized.
In the invention, the thick slurry box 14 can be connected with other comprehensive utilization equipment to utilize thick slurry.
In the present invention, the terms "upper", "lower", "opposite" and the like are used with reference to the orientation shown in the drawings.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides an utilize system of flue gas waste heat evaporation concentration desulfurization waste water, its characterized in that, including concentrating tower (2), concentrating tower (2) are provided with flue gas entry (3), exhanst gas outlet (4), filtrating entry (17) and waste water entry (18), flue gas entry (3) and exhanst gas outlet (4) all are connected with quoting main flue (9), concentrating tower (2) inside is provided with sprays layer (5), is provided with circulating pump (6) in concentrating tower (2) outside, the one end of circulating pump (6) and the circulation liquid export intercommunication of concentrating tower (2), the other end of circulating pump (6) with spray layer (5) intercommunication, filtrating entry (17) are located spray between layer (5) and the circulation liquid export, concentrating tower (2) bottom is provided with thick liquids export (13).
2. The system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat according to claim 1, further comprising a thick slurry tank (14) and a dehydrator (16), wherein the thick slurry tank (14) is respectively connected with the slurry outlet (13) and the dehydrator (16), and the dehydrator (16) is connected with the filtrate inlet (17).
3. The system for evaporating and concentrating desulfurization wastewater by using flue gas waste heat as claimed in claim 2, characterized in that a tempering tank (15) is further arranged between the thick slurry tank (14) and the dehydrator (16).
4. A system for evaporating and concentrating desulfurization waste water by using the waste heat of flue gas according to any one of claims 1 to 3, characterized in that the waste water inlet (18) is connected with the waste water tank (1).
5. The system for evaporative concentration of desulfurization waste water by using waste heat of flue gas as claimed in any one of claims 1-3, wherein the flue gas inlet (3) is located on the side wall of the concentration tower (2) and below the spray layer (5), the flue gas outlet (4) is located on the top of the concentration tower (2), the inner top of the concentration tower (2) is further provided with a demister, and the demister is located above the spray layer (5).
6. The system for evaporative concentration of desulfurization waste water by using waste heat of flue gas as claimed in any one of claims 1 to 3, wherein the flue gas inlet (3) is connected with the citing main flue (9) through an inlet flue (11), the flue gas outlet (4) is connected with the citing main flue (9) through an outlet flue (12), the inlet flue (11) is further provided with a booster fan (7), and the flue gas citing the main flue (9) is pressurized in the inlet flue (11) by the booster fan (7) and then is sent to the interior of the concentration tower (2).
7. The system for evaporative concentration of desulfurization waste water by using the waste heat of flue gas as recited in any one of claims 1 to 3, wherein said filtrate inlet (17) is located opposite to said circulating liquid outlet and below said flue gas inlet (3), and said filtrate inlet (17) is located at a position lower than the liquid level in said concentration tower (2).
8. The system for evaporative concentration of desulfurization waste water by using waste heat of flue gas as claimed in claim 6, characterized in that said inlet flue (11) is provided with a first damper door (8), said first damper door (8) is used for isolating system inlet flue gas, said outlet flue (12) is provided with a second damper door (10), said second damper door (10) is used for isolating system outlet flue gas.
9. A method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat, which is characterized by adopting the system as claimed in any one of claims 1 to 8, and comprising the following steps:
step 1: flue gas and waste water enter a tower for heat exchange, evaporation and concentration of waste water
Flue gas enters a concentration tower (2) through an inlet flue (11) and moves from bottom to top, upper-layer liquid of wastewater and filtrate after sedimentation at the bottom of the concentration tower (2) enters a spraying layer (5) through a circulating pump (6) and moves downwards in an atomized state through spraying, the upper-layer liquid contacts with the flue gas flowing upwards in a countercurrent manner to exchange heat and evaporate, and concentrated wastewater and filtrate obtain thick slurry;
step 2: discharging thick slurry
Discharging the thick slurry from the concentration tower (2) to a thick slurry box (14);
and step 3: adjusting the pH value
Conveying the thick pulp in the thick pulp box (14) to a tempering box (15), and adding an alkaline substance to adjust the PH to be more than 2;
and 4, step 4: dewatering
And conveying the thick slurry in the conditioning box (15) to a dehydrator (16) for dehydration, and returning the dehydrated filtrate to the bottom of the concentration tower (2) through a filtrate inlet (17) to continuously participate in evaporation concentration.
10. The method for evaporating and concentrating desulfurization wastewater by using the waste heat of flue gas as claimed in claim 9, wherein the filtrate is settled and layered after being returned to the concentration tower (2), and the slurry in the upper layer is conveyed to the spraying layer (5) by the circulating pump (6) for spraying, so that the circulating heat exchange concentration is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010217666.8A CN111252993A (en) | 2020-03-25 | 2020-03-25 | System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010217666.8A CN111252993A (en) | 2020-03-25 | 2020-03-25 | System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111252993A true CN111252993A (en) | 2020-06-09 |
Family
ID=70944403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010217666.8A Pending CN111252993A (en) | 2020-03-25 | 2020-03-25 | System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111252993A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777119A (en) * | 2020-07-09 | 2020-10-16 | 南京万德斯环保科技股份有限公司 | Waste water evaporation treatment equipment and process |
| CN113105059A (en) * | 2021-05-19 | 2021-07-13 | 山东博然电力科技有限公司 | Waste water evaporation and concentration device combining with boiler waste heat dynamic wave and use method |
-
2020
- 2020-03-25 CN CN202010217666.8A patent/CN111252993A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777119A (en) * | 2020-07-09 | 2020-10-16 | 南京万德斯环保科技股份有限公司 | Waste water evaporation treatment equipment and process |
| CN113105059A (en) * | 2021-05-19 | 2021-07-13 | 山东博然电力科技有限公司 | Waste water evaporation and concentration device combining with boiler waste heat dynamic wave and use method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107129094B (en) | Zero discharge system based on multi-heat-source evaporation desulfurization waste water | |
| CN105481157A (en) | Method for zero emission treatment of desulfurization waste water based on flue gas waste heat evaporation | |
| CN107857321B (en) | Process for zero discharge treatment of wastewater of thermal power plant | |
| CN109647164B (en) | Zero-emission wastewater desulfurization process and device | |
| CN108117122B (en) | Treatment method and treatment device for sodium-method flue gas desulfurization wastewater | |
| CN113800690A (en) | Power plant desulfurization wastewater zero-discharge treatment process and system based on electrodialysis technology | |
| CN107777820A (en) | The technique that Air-Cooling Island exhaust steam residual heat is used for Waste Water From Fire Power Plant zero discharge treatment | |
| CN108117210B (en) | Treatment method and treatment device for flue gas desulfurization waste liquid | |
| CN111252993A (en) | System and method for evaporating and concentrating desulfurization wastewater by using flue gas waste heat | |
| CN106517628A (en) | Desulfurization-wastewater zero discharging device for coal-fired power plant | |
| CN111423046A (en) | Power plant desulfurization wastewater advanced treatment and resource utilization system and method | |
| CN113501612A (en) | Energy-concerving and environment-protective type desulfurization waste water zero release processing system | |
| CN111439882A (en) | Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant | |
| CN107151072B (en) | Treatment process of desulfurization wastewater | |
| CN110642444A (en) | Vacuum phase-change wastewater concentration and flue gas waste heat recovery system | |
| CN110183024A (en) | A kind of device using low-grade flue gas concentration waste water | |
| CN110746025A (en) | Low-temperature negative-pressure wastewater zero discharge system | |
| CN112125463A (en) | Power plant variable load coal-fired boiler desulfurization wastewater zero discharge system | |
| CN210595645U (en) | Desulfurization waste water zero release bypass flue evaporation system | |
| CN111453795A (en) | High-magnesium desulfurization wastewater concentration and reduction treatment system and process | |
| CN212532606U (en) | System for evaporating and concentrating desulfurization wastewater by using flue gas waste heat | |
| CN108793557B (en) | Desulfurization wastewater bypass flue evaporation treatment process and system | |
| CN110627289A (en) | Low-temperature flue gas heating wastewater concentration system | |
| CN207313350U (en) | A kind of desulfurization wastewater zero-emission and recycling treatment system | |
| CN213294703U (en) | Fly ash desalination system containing potassium chloride salt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |