CN112520805A - Desulfurization waste water flue gas waste heat flat membrane concentration decrement system - Google Patents
Desulfurization waste water flue gas waste heat flat membrane concentration decrement system Download PDFInfo
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- CN112520805A CN112520805A CN202011299844.2A CN202011299844A CN112520805A CN 112520805 A CN112520805 A CN 112520805A CN 202011299844 A CN202011299844 A CN 202011299844A CN 112520805 A CN112520805 A CN 112520805A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 217
- 239000012528 membrane Substances 0.000 title claims abstract description 172
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 129
- 230000023556 desulfurization Effects 0.000 title claims abstract description 129
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 239000003546 flue gas Substances 0.000 title claims abstract description 83
- 239000002918 waste heat Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 160
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000009467 reduction Effects 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000001704 evaporation Methods 0.000 claims description 24
- 230000008020 evaporation Effects 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 4
- 239000012717 electrostatic precipitator Substances 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 16
- 125000004122 cyclic group Chemical group 0.000 description 5
- 230000003009 desulfurizing effect Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- 239000000047 product Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- C02F1/08—Thin film 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
- C02F1/02—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
- C02F1/02—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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention relates to a flat membrane concentration and reduction system for waste heat of flue gas in desulfurization wastewater, which comprises a flue gas-desalted water heat exchanger, a wastewater circulating concentration water tank and flat membrane concentration equipment, wherein a heat exchanger I is arranged in the flue gas-desalted water heat exchanger; the wastewater circulating concentration water tank is filled with desulfurization wastewater, and a heat exchanger II is arranged in the wastewater circulating concentration water tank; a plurality of layers of flat membranes are arranged in the flat membrane concentration equipment, and the heat exchanger I is communicated with the heat exchanger II through a pipeline and is filled with circularly heated desalted water; the desulfurization wastewater heated from the wastewater circulating concentration water tank enters a flat membrane concentration device, forms a water film on the upper surface of the flat membrane, continuously evaporates water from the wastewater, and is sent into the wastewater circulating concentration water tank for heating again; the flue gas led out from the flue enters the flat membrane concentration equipment, passes through the upper part of each layer of flat membrane and then carries the water vapor evaporated from the water membrane to return to the flue. The invention has simple process structure, simple and convenient operation, low operation cost and convenient maintenance.
Description
Technical Field
The invention belongs to the technical field of desulfurization wastewater concentration, and particularly relates to a flat membrane concentration and reduction system for flue gas waste heat of desulfurization wastewater.
Background
In the technical field of FGD wastewater treatment, a limestone-gypsum wet flue gas desulfurization process is mainly adopted, the process is stable in operation, convenient to maintain and high in desulfurization efficiency, and is the most widely applied desulfurization technology at present. In order to ensure the stable operation and the desulfurization efficiency of the desulfurization and desulfurization system, the concentration of chloride ions in the circulating desulfurization slurry is controlled to be 12000-20000mg/L, the concentration of the chloride ions in the desulfurization slurry continuously rises along with the continuous proceeding of the desulfurization reaction of the absorption tower, part of the slurry in the absorption tower needs to be discharged and replaced, and the desulfurization system needs to discharge wastewater periodically. The waste water is acidic, contains a large amount of suspended substances, salt substances, calcium and magnesium ions, chlorides, heavy metals, COD, fluorides and the like, contains a large amount of components mainly depending on factors such as the sulfur content of fuel, a desulfurization process and the like, and is difficult to treat.
At present, various concentration and reduction processes are developed in the field of zero discharge of desulfurization wastewater of power plants, and mainly comprise the following steps:
(1) various membrane method concentration, for the membrane method concentration decrement process, the pretreatment such as softening, removing suspended matters and the like is needed, the dosage required by the softening treatment is large, the secondary pollution is caused, and the cost is high; in addition, the cleaning process of various membranes is complicated, and the requirement on the quality of the desulfurization wastewater is high.
(2) According to the evaporation type concentration route, desulfurization waste water is sprayed into very small fog drops in an evaporation tank and is heated by low-temperature flue gas waste heat to evaporate and concentrate the waste water, and for the evaporation and concentration of the waste water in the evaporation tank by using the low-temperature flue gas waste heat, the large fog drops possibly enter a flue along with flue gas without being completely evaporated, and although a demister is arranged, the risk of scaling or blockage of the flue is possibly brought.
(3) Vacuum multiple-effect evaporation concentration and the like, the utilization rate of the generated steam is low, the electric quantity consumption of the vacuum pump is large, and the overall operation cost is high.
Disclosure of Invention
The invention aims to provide a flat membrane concentration and reduction system for waste heat of flue gas of desulfurization wastewater, which aims to solve the problem of high operation cost of desulfurization wastewater concentration.
The invention relates to a flat membrane concentration and decrement system for waste heat of flue gas in desulfurization wastewater, which is realized by the following steps:
a desulfurization waste water flue gas waste heat flat membrane concentration and reduction system comprises
The flue gas-desalted water heat exchanger is arranged in the desulfurization flue and positioned on the front side of the electrostatic dust collector, and a heat exchanger I is arranged in the flue gas-desalted water heat exchanger;
the waste water circulating and concentrating water tank is filled with the desulfurization waste water discharged from the FGD desulfurization tower, and a heat exchanger II is arranged in the waste water circulating and concentrating water tank;
the device comprises a flat membrane concentration device, a membrane separation device and a membrane separation device, wherein a plurality of layers of flat membrane components which are obliquely and stacked are arranged in the flat membrane concentration device, and a gap is arranged between every two adjacent flat membranes;
the heat exchanger I is communicated with the heat exchanger II through a pipeline and is filled with circularly heated desalted water;
the desulfurization wastewater heated from the wastewater circulating concentration water tank enters a flat membrane concentration device, a uniformly flowing water film is formed on the upper surface of the flat membrane and flows downwards under the action of gravity, water vapor is continuously evaporated from the wastewater in the flowing process of the desulfurization wastewater on the flat membrane, the desulfurization wastewater flows to the bottom of the flat membrane to complete single evaporation concentration of the desulfurization wastewater on the flat membrane, then the desulfurization wastewater is sent into the wastewater circulating concentration water tank from the flat membrane concentration device through a return pipeline for heating, and the desulfurization wastewater enters the next evaporation concentration process on the flat membrane after the heating is completed, so that the flat membrane circulating evaporation concentration is formed; the flue gas led out from the flue enters the flat membrane concentration equipment, passes through the upper part of each layer of flat membrane and then carries the water vapor evaporated from the flat membrane to enter the flue.
Furthermore, the heat exchanger I is a finned tube heat exchanger, the heat exchanger II is a plate heat exchanger or a tubular heat exchanger, and desalted water is heated by flue gas in a flue in the heat exchanger I and then enters the heat exchanger II to heat the desulfurization wastewater in the wastewater circulating and concentrating water tank.
Further, dull and stereotyped membrane concentrator's casing top is provided with dull and stereotyped membrane concentrator waste water import, and the bottom is provided with dull and stereotyped membrane concentrator waste water export, dull and stereotyped membrane concentrator waste water import with the delivery port I of waste water cyclic concentration water tank links to each other, dull and stereotyped membrane concentrator waste water export with waste water cyclic concentration water tank's water inlet I links to each other.
Further, the casing front end of dull and stereotyped membrane concentrator is provided with the flue gas inlet, and the rear end is provided with the exhanst gas outlet, the flue gas inlet links to each other with the flue of electrostatic precipitator rear side, the exhanst gas outlet links to each other with the bypass flue that gets into the FGD desulfurizing tower.
Further, each flat membrane is obliquely arranged in a mode of being high in front and low in back, and the flat membranes are parallel to each other.
Furthermore, the upper end of each layer of flat membrane is provided with a waste water uniform distributor, and a waste water inlet of the flat membrane concentration equipment is connected with the waste water uniform distributors of each layer of flat membrane through a waste water distribution pipe.
Furthermore, the lower end of each layer of flat membrane is connected with a waste water outlet of the flat membrane concentration equipment through a waste water reflux tank.
Further, a flue gas uniform distributor is arranged inside the flue gas inlet.
Furthermore, a desulfurization waste water storage tank is arranged between the waste water circulating and concentrating water tank and the FGD desulfurization tower, and a water outlet of the desulfurization waste water storage tank is connected with a water inlet II of the waste water circulating and concentrating water tank.
Furthermore, a water outlet II of the wastewater circulating and concentrating water tank is connected with a concentrated water tank.
After the technical scheme is adopted, the invention has the beneficial effects that:
(1) the concentration and decrement system adopted by the invention has the advantages that the desulfurization wastewater does not need pretreatment and medicament addition, the risks of pretreatment medicament harm and product harm are eliminated, and the operation cost is reduced;
(2) the concentration and decrement system adopted by the invention has strong adaptability, is suitable for the separation wastewater of different components generated by different boiler loads, coal types, desulfurizing agents and process water quality, can reach the required concentration rate, and the concentration rate is controllable;
(3) the flat membrane concentration equipment of the invention carries the water vapor evaporated in the concentration process into the flue through the flue gas led out from the flue, and enters the FGD desulfurization tower along with the flue gas, so that the temperature of the flue gas can be reduced, the humidity of the flue gas can be improved, the dust removal rate of the absorption tower can be improved, the water supplement amount of the FGD desulfurization tower can be reduced, and the desulfurization and dust removal efficiency can be gained to a certain extent;
(4) according to the invention, the concentrated wastewater can be used for obviously reducing the consumption of high-temperature flue gas, reducing the coal consumption and lowering the operation cost in a subsequent solidification process such as a high-temperature flue bypass flash evaporation system;
(5) the concentration and decrement system provided by the invention can be directly additionally arranged in the original desulfurization process, realizes high-efficiency fusion with the commonly used desulfurization wastewater zero-discharge process, and further reduces the operation cost.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a structural diagram of a flat membrane concentration and reduction system for residual heat of flue gas from desulfurization wastewater according to a preferred embodiment of the present invention;
FIG. 2 is a sectional view of a flat membrane concentration device of a flat membrane concentration and reduction system for residual heat of flue gas of desulfurization waste water according to a preferred embodiment of the present invention;
FIG. 3 is a top view structural diagram of a single-layer flat membrane of the flat membrane concentration and reduction system for residual heat of flue gas from desulfurization waste water according to the preferred embodiment of the present invention;
FIG. 4 is a side sectional view of the upper end of the flat membrane concentration and reduction system for residual heat of flue gas from desulfurization waste water according to the preferred embodiment of the present invention;
FIG. 5 is a partial structure diagram of a wastewater uniform distributor of a desulfurization wastewater flue gas waste heat flat membrane concentration and reduction system according to a preferred embodiment of the present invention;
in the figure: the device comprises a flue gas-desalted water heat exchanger 1, a heat exchanger I11, a wastewater circulating and concentrating water tank 2, a heat exchanger II 21, a water inlet I2, a water outlet I23, a water inlet II 24, a water outlet II 25, a flat membrane concentrating device 3, a flat membrane 31, a shell 32, a flat membrane concentrating device wastewater inlet 33, a flat membrane concentrating device wastewater outlet 34, a flue gas inlet 35, a flue gas outlet 36, a wastewater uniform distributor 37, a wastewater water distribution pipe 38, a wastewater reflux tank 39, a flue gas uniform distributor 310, a water distribution hole 311, a collection tank 312, an electrostatic dust collector 4, a circulating pump 5, a desulfurization wastewater storage tank 6, a concentrated water tank 7, a slurry discharge pump 8 and an FGD desulfurization tower 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-5, a flat membrane concentration and reduction system for waste heat of flue gas in desulfurization wastewater comprises a flue gas-desalted water heat exchanger 1, a wastewater circulating concentration water tank 2 and a flat membrane concentration device 3, wherein the flue gas-desalted water heat exchanger 1 is installed in a desulfurization flue and positioned at the front side of an electrostatic dust collector 4, and a heat exchanger I11 is arranged in the flue gas-desalted water heat exchanger; the wastewater circulating concentration water tank 2 is filled with desulfurization wastewater discharged from the FGD desulfurization tower 9, and a heat exchanger II 21 is arranged in the wastewater circulating concentration water tank; a plurality of inclined and stacked flat membranes 31 are arranged in the flat membrane concentration equipment 3, and a gap is arranged between every two adjacent flat membranes 31; the heat exchanger I11 is communicated with the heat exchanger II 21 through a pipeline and is filled with circularly heated desalted water;
the desulfurization wastewater heated from the wastewater circulating and concentrating water tank 2 enters a flat membrane concentrating device 3, a uniformly flowing water film is formed on the upper surface of a flat membrane 31 and flows downwards under the action of gravity, water vapor is continuously evaporated from the wastewater in the process that the desulfurization wastewater flows on the flat membrane 31, the desulfurization wastewater completes single evaporation and concentration of the desulfurization wastewater on the flat membrane 31 when flowing to a wastewater return tank 39 at the bottom of the flat membrane 31, then the desulfurization wastewater is sent into the wastewater circulating and concentrating water tank 2 from the flat membrane concentrating device 3 through a return pipeline for heating, and the desulfurization wastewater enters the next evaporation and concentration process on the flat membrane 31 after the heating is completed, so that the wastewater is circularly evaporated and concentrated on the flat membrane 31; the flue gas led out from the flue enters the flat membrane concentration equipment 3, passes through the upper part of each layer of flat membrane 31 and then carries the water vapor evaporated from the flat membrane 31 into the flue.
In order to realize the cyclic heating of the desulfurization wastewater and further increase the effect of evaporating the desulfurization wastewater on the flat membrane 31, the heat exchanger I11 is a finned tube heat exchanger, the heat exchanger II 21 is a plate heat exchanger or a tubular heat exchanger, and the desalted water is heated by the flue gas in the flue in the heat exchanger I11 and then enters the heat exchanger II 21 to heat the desulfurization wastewater in the wastewater cyclic concentration water tank 2.
The flue gas in the flue gas-desalting heat exchanger heats the desalted water in the heat exchanger I11 to 95-98 ℃, and the heated desalted water enters the heat exchanger II 21 in the wastewater circulating concentration water tank 2 to exchange heat with the desulfurized wastewater in the wastewater circulating concentration water tank 2, so that the desulfurized wastewater is heated, and at the moment, the desulfurized wastewater can be heated to 90-95 ℃.
Be provided with circulating pump I5 in this circulating line to and temperature-detecting device is like temperature sensor, realizes desulfurization waste water heating temperature's intelligent control.
After the low-temperature flue gas in the flue exchanges heat with the flue heat exchanger, the temperature of the low-temperature flue gas is reduced from 130-150 ℃ to 100-120 ℃, and the flue gas has a positive effect on the dust removal efficiency of the electrostatic dust remover 4 after being cooled.
In order to introduce the heated desulfurization wastewater into the flat membrane concentration device 3 for concentration treatment, the top of the shell of the flat membrane concentration device 3 is provided with a waste water inlet 33 of the flat membrane concentration device, the bottom of the shell is provided with a waste water outlet 34 of the flat membrane concentration device, the waste water inlet 33 of the flat membrane concentration device is connected with the water outlet I22 of the waste water circulating concentration water tank 2, and the waste water outlet 34 of the flat membrane concentration device is connected with the water inlet I23 of the waste water circulating concentration water tank 2.
The flat membrane concentration device 3 includes a housing 32, and the flat membrane 31 is disposed in the housing 32.
The heated desulfurization wastewater in the wastewater circulating concentration water tank 2 enters the flat membrane concentration equipment 3, the temperature is reduced to about 87 ℃ after concentration, then the wastewater enters the wastewater circulating concentration water tank 2 again for heating treatment, and the heated desulfurization wastewater enters the flat membrane concentration equipment 3 for circulating evaporation concentration.
The concentration process in the flat membrane concentration equipment 3 is carried out circularly, and a detection element is arranged in the wastewater circulating concentration water tank 2, so that the concentration condition of the desulfurization wastewater is detected in real time, and when the desulfurization wastewater reaches the set concentration, the desulfurization wastewater is discharged into the concentrated water tank 5.
In order to realize the concentration of the desulfurization wastewater in the flat membrane concentration device 3, the front end of the shell of the flat membrane concentration device 3 is provided with a flue gas inlet 35, the rear end of the shell is provided with a flue gas outlet 36, the flue gas inlet 35 is connected with a bypass flue at the rear side of the electrostatic precipitator 4, and the flue gas outlet 36 is connected with a flue entering the FGD desulfurization tower 9.
18-28% of flue gas is led out from the flue by the flue gas inlet 35 and enters the flat membrane concentration equipment 3, a water membrane which is uniformly distributed and continuously flows is formed above the flat membrane 31, the flue gas passes through the water membrane, and the direction of the flue gas convection is consistent with the flowing direction of the water film, and under the condition of strong flue gas convection on the surface of the water film, wherein, the water molecules break the surface tension due to the thermal motion to form water vapor which escapes into the flue gas and is quickly taken away by the flue gas above the water film, the flow rate of the flue gas is larger, the stronger the convective heat transfer capability is, the larger the evaporation capacity is, the water vapor and heat evaporated from the surface of the water film can be quickly taken away in time by the flue gas at a certain speed, the updating process of a gas-liquid contact surface is accelerated, the water vapor pressure above the water film is maintained at a lower level, the generated evaporation driving force is increased, and the evaporation of the water in the desulfurization wastewater and the diffusion process to the flue gas are accelerated.
Because the evaporation of water needs to absorb heat, the heat is provided by a heat exchange system formed by the flue gas-desalted water heat exchanger 1 and the wastewater circulating and concentrating water tank 2 of the system, the natural evaporation carried out below the boiling point is continuously and circularly carried out along with the flowing of the desulfurization wastewater on the surface of the flat membrane 31, meanwhile, the heat of the desulfurization wastewater is taken away, the temperature of the heat is gradually reduced in the continuous flowing process, when the heat flows to the bottom of the flat membrane 31 and enters the wastewater circulating and concentrating water tank 2 again, the temperature is about 87 ℃, at the moment, the heat can be heated again in the wastewater circulating and concentrating water tank 2, and the heat enters the flat membrane concentrating equipment 3 to carry out the next circulating and evaporating and concentrating process after being heated to the set temperature.
In order to realize the concentration circulation of the desulfurization wastewater and control the circulating evaporation of the desulfurization wastewater, a circulating pump II is arranged between the wastewater circulating concentration water tank 2 and the flat membrane concentration equipment 3.
And in the concentration process, the flue gas takes away the vapor that the desulfurization waste water evaporated out and gets into the flue, then gets into FGD desulfurizing tower 9, and this process can reduce the temperature of flue gas, improves the humidity of flue gas, is favorable to improving the desorption rate of absorption tower to the dust, reduces the moisturizing volume of FGD desulfurizing tower 9, and this is the gain to desulfurization dust collection efficiency.
In order to form a continuous flowing water film on the flat membrane 31 by gravity, the flat membrane 31 is inclined in a manner of being higher and lower.
The desulfurization wastewater flows uniformly from top to bottom on the surface of the flat membrane 31 under the action of self gravity to form a uniform water membrane structure.
Specifically, the flat membrane 31 may have a groove-like structure with an upper portion opened outward, in order to facilitate the formation of the water film.
The flat membrane 31 layers are parallel to each other, so that the uniformity of the flat membrane 31 layers can be ensured.
Preferably, the flat membrane 31 is made of 2507 or 1.4529 steel, which has good corrosion resistance.
In order to supply water to each layer of flat membrane 31, a waste water distributor 37 is arranged at the upper end of each layer of flat membrane 31, and the waste water inlet 33 of the flat membrane concentration equipment is connected with the waste water distributor 37 of each flat membrane 31 through a waste water distributing pipe 38.
The wastewater distributor 37 may be a water pipe structure having uniformly distributed water distribution holes 311, the radial direction of the water pipe is perpendicular to the length direction of the flat membrane 31, and the water pipe is connected to the wastewater distribution pipe 38, and the same wastewater distribution pipe 38 supplies water to each layer of the flat membrane 31.
Preferably, the water distribution holes 311 may be kidney-shaped holes.
The waste water uniform distributor 37 is installed inside the upper end of the groove-shaped flat membrane 31, the water distribution holes 311 face the direction of the flat membrane 31, and a certain deflection angle alpha is formed towards the lower end of the flat membrane 31, so that a water film is conveniently formed on the upper surface of the flat membrane 31.
Preferably, the deflection angle α of the water distribution holes 311 is 20 °.
In order to discharge the concentrated waste water, the lower end of each layer of the flat membrane 31 is connected with the waste water outlet 34 of the flat membrane concentration equipment through a waste water reflux groove 39.
The lower end of each layer of flat membrane 31 is provided with a collecting tank 312, and the two end parts of the collecting tank 312 are respectively connected with a waste water return tank 39, and concentrated waste water is discharged from a waste water outlet 34 of the flat membrane concentration device through the waste water return tank 39.
In order to distribute the flue gas uniformly above each layer of flat membrane 31, a flue gas distributor 310 is provided inside the flue gas inlet 35.
Specifically, the flue gas uniform distributor 310 includes a plurality of arc-shaped guide plates which are stacked, so that flue gas can uniformly enter the layers of the flat membrane 31.
In order to ensure that the water film can be formed under the action of gravity, the inclination angle of the flat membrane 31 is 28-35 degrees.
Preferably, the inclination angle of the flat membrane 31 is 30 °, and under the inclination angle, the water membrane can be completely formed, and the water flow speed of the water membrane can be relatively controlled, so that the concentration effect is improved.
The inclination angle of the flat membrane 31 can be adjusted according to the requirement of the water flow speed, and when the inclination angle is increased, the water flow speed is increased, and when the inclination angle is reduced, the water flow speed is reduced.
In order to facilitate the passing of the smoke, the distance between the adjacent flat membranes 31 is 80-100 mm.
The length of the single-piece flat membrane 31 is 3000-.
The distance between adjacent flat membranes 31, the length of the flat membranes 31, the number of layers of the flat membranes 31, and the like can be adjusted according to the actual concentration requirement.
In order to uniformly supply desulfurization wastewater to the wastewater circulating and concentrating water tank 2, a desulfurization wastewater storage tank 6 is arranged between the wastewater circulating and concentrating water tank 2 and the FGD desulfurization tower 9, and a water outlet of the desulfurization wastewater storage tank 6 is connected with a water inlet II 24 of the wastewater circulating and concentrating water tank 2.
In order to send desulfurization waste water into the waste water circulating concentration water tank 2 from the desulfurization waste water storage tank 6, a circulating pump III is arranged between the two.
In order to collect the concentrated desulfurization wastewater conveniently, a water outlet II 25 of the wastewater circulating and concentrating water tank 2 is connected with a concentrated water tank 7.
Be provided with the mud pump 8 between concentrated water tank 2 of waste water circulation and the thick water tank 7, after the concentrated desulfurization waste water of the concentrated water tank 2 of waste water circulation is concentrated to setting for concentration, then start mud pump 8, in the thick water tank 7 is discharged into to the desulfurization waste water that will concentrate the completion, the subsequent processing of being convenient for.
And the desulfurization waste water storage tank 6 can inject the desulfurization waste water into the waste water circulating concentration water tank 2 again to perform circulating concentration operation again.
When carrying out desulfurization waste water treatment, the desulfurization waste water that has FGD desulfurizing tower 9 to produce directly stores in desulfurization waste water storage tank 6, and desulfurization waste water storage tank 6 then provides desulfurization waste water to in the concentrated water tank 2 of waste water circulation, the demineralized water gets into concentrated water tank 2 of waste water circulation after the heating of flue gas-demineralized water heat exchanger 1, heats its inside desulfurization waste water, the demineralized water temperature after the heat transfer reduces, then get into flue gas-demineralized water heat exchanger 1 once more and carry out the secondary heating, be convenient for follow-up recirculation to desulfurization waste water. And the heated desulfurization waste water enters the flat membrane concentration equipment 3, an even and constantly flowing water membrane is formed on the flat membrane 31, bypass flue gas is led out from the flue by the flat membrane concentration equipment 3, the flue gas passes through the upper part of the water membrane and carries water vapor generated by the water membrane on the flat membrane 31, and then the flue gas enters the flue again, the temperature of the concentrated desulfurization waste water is reduced, and the concentrated desulfurization waste water enters the waste water circulating concentration water tank 2 again for heating, so that the circulating evaporation concentration is convenient. When the desulfurization wastewater entering the wastewater circulating and concentrating water tank 2 reaches a set concentration, the desulfurization wastewater is discharged from the wastewater circulating and concentrating water tank 2 into the concentrated water tank 7. And the desulfurization waste water storage tank 6 provides the desulfurization waste water again for the next cyclic concentration process.
The invention coordinates heat exchange and flat membrane concentration into a whole, completes the concentration and decrement of the desulfurization wastewater, fully embodies the design concept of low operation cost and low energy consumption, has the main energy consumption of only a plurality of circulating pumps in the operation process, completely utilizes the waste heat of flue gas and flue gas as the energy used for evaporation, has simple process structure and convenient operation, can be effectively integrated into the desulfurization wastewater zero-discharge process in the current market, and provides assistance for the reduction of the operation cost.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A desulfurization waste water flue gas waste heat flat membrane concentration decrement system is characterized by comprising
The flue gas-desalted water heat exchanger (1) is arranged in the desulfurization flue and positioned on the front side of the electrostatic dust collector (4), and a heat exchanger I (11) is arranged in the flue gas-desalted water heat exchanger (1);
the waste water circulating and concentrating water tank (2) is filled with the desulfurization waste water discharged from the FGD desulfurization tower, and a heat exchanger II (21) is arranged in the waste water circulating and concentrating water tank (2);
the flat membrane concentration equipment (3) is internally provided with a plurality of inclined flat membrane (31) assemblies which are stacked, and a gap is arranged between every two adjacent flat membranes (31);
the heat exchanger I (11) is communicated with the heat exchanger II (21) through a pipeline and is filled with circularly heated desalted water;
desulfurization wastewater heated from the wastewater circulating concentration water tank (2) enters a flat membrane concentration device (3), a uniformly flowing water film is formed on the upper surface of the flat membrane (31), moisture is continuously evaporated from the wastewater, and the desulfurization wastewater is conveyed into the wastewater circulating concentration water tank (2) again from the flat membrane concentration device (3) to be heated after single evaporation concentration of the desulfurization wastewater is completed, so that a circulating heating evaporation concentration process is formed; flue gas led out from the flue enters the flat membrane concentration equipment (3), passes through the upper part of each layer of flat membrane (31), and then carries water vapor evaporated from the water membrane to return to the flue.
2. The flat sheet membrane concentration and reduction system for the waste heat of the desulfurization wastewater and the flue gas as claimed in claim 1, wherein the heat exchanger I (11) is a finned tube heat exchanger, the heat exchanger II (21) is a plate heat exchanger or a tubular heat exchanger, and the desalted water is heated by the flue gas in the flue in the heat exchanger I (11) and then enters the heat exchanger II (21) to circularly heat the desulfurization wastewater in the wastewater circulating concentration water tank (2).
3. The flat membrane concentration and reduction system for the waste heat of desulfurization waste water and flue gas as claimed in claim 1, wherein a flat membrane concentration device waste water inlet (33) is arranged at the top of the casing of the flat membrane concentration device (3), a flat membrane concentration device waste water outlet (34) is arranged at the bottom of the casing, the flat membrane concentration device waste water inlet (33) is connected with the water outlet I (22) of the waste water circulation concentration water tank (2), and the flat membrane concentration device waste water outlet (34) is connected with the water inlet I (23) of the waste water circulation concentration water tank (2).
4. The flat membrane concentration and reduction system for the waste heat of desulfurization waste water and flue gas as claimed in claim 1, wherein the front end of the casing of the flat membrane concentration device (3) is provided with a flue gas inlet (35), the rear end of the casing is provided with a flue gas outlet (36), the flue gas inlet (35) is connected with a bypass flue at the rear side of the electrostatic precipitator (4), and the flue gas outlet (36) is connected with a flue entering the FGD desulfurization tower (9).
5. The flat membrane concentration and reduction system for the residual heat of flue gas generated by desulfurization waste water of claim 1, wherein each flat membrane (31) is disposed in an inclined manner with a front height and a rear height, and each flat membrane (31) is parallel to each other.
6. The flat membrane concentration and reduction system for waste heat of desulfurization waste water and flue gas as claimed in claim 3, wherein the upper end of each layer of flat membrane (31) is provided with a waste water distributor (37), and the waste water inlet (33) of the flat membrane concentration equipment is connected with the waste water distributors (37) of each layer of flat membrane (31) through waste water distribution pipes (38).
7. The flat membrane concentration and reduction system for the waste heat of desulfurization waste water and flue gas as claimed in claim 1, wherein the lower end of each layer of flat membrane (31) is connected with the waste water outlet (34) of the flat membrane concentration equipment through a waste water reflux tank (39).
8. The flat membrane concentration and reduction system for waste heat of desulfurization waste water and flue gas as claimed in claim 4, wherein a flue gas uniform distributor (310) is arranged inside the flue gas inlet (35).
9. The flat sheet membrane concentration and reduction system for waste heat of desulfurization waste water and flue gas as claimed in claim 1, wherein a desulfurization waste water storage tank (6) is arranged between the waste water circulation concentration water tank (2) and the FGD desulfurization tower, and a water outlet of the desulfurization waste water storage tank (6) is connected with a water inlet II (24) of the waste water circulation concentration water tank (2).
10. The flat membrane concentration and reduction system for the waste heat of desulfurization wastewater and flue gas as recited in claim 1, wherein a water outlet II (25) of the wastewater circulating concentration water tank (2) is connected with a concentrated water tank (7).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417469A (en) * | 2022-07-06 | 2022-12-02 | 国能(山东)能源环境有限公司 | Desulfurization wastewater treatment system |
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| CN107485871A (en) * | 2017-09-30 | 2017-12-19 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and its processing method |
| CN110255640A (en) * | 2019-07-03 | 2019-09-20 | 杭州新际能源科技有限公司 | Contact evaporator and its method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107485871A (en) * | 2017-09-30 | 2017-12-19 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and its processing method |
| CN110255640A (en) * | 2019-07-03 | 2019-09-20 | 杭州新际能源科技有限公司 | Contact evaporator and its method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417469A (en) * | 2022-07-06 | 2022-12-02 | 国能(山东)能源环境有限公司 | Desulfurization wastewater treatment system |
| CN115417469B (en) * | 2022-07-06 | 2023-10-24 | 国能(山东)能源环境有限公司 | Desulfurization wastewater treatment system |
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Application publication date: 20210319 |