CN111620360A - Desulfurization gypsum cleaning water recycling method and system - Google Patents
Desulfurization gypsum cleaning water recycling method and system Download PDFInfo
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- CN111620360A CN111620360A CN202010610863.6A CN202010610863A CN111620360A CN 111620360 A CN111620360 A CN 111620360A CN 202010610863 A CN202010610863 A CN 202010610863A CN 111620360 A CN111620360 A CN 111620360A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000010440 gypsum Substances 0.000 title claims abstract description 107
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 107
- 238000004064 recycling Methods 0.000 title claims abstract description 69
- 238000004140 cleaning Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006477 desulfuration reaction Methods 0.000 title claims description 32
- 230000023556 desulfurization Effects 0.000 title claims description 32
- 239000002351 wastewater Substances 0.000 claims abstract description 50
- 238000001179 sorption measurement Methods 0.000 claims abstract description 44
- 239000012267 brine Substances 0.000 claims abstract description 41
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 41
- 238000005406 washing Methods 0.000 claims abstract description 35
- 230000018044 dehydration Effects 0.000 claims description 15
- 238000006297 dehydration reaction Methods 0.000 claims description 15
- 238000002425 crystallisation Methods 0.000 claims description 12
- 230000008025 crystallization Effects 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 19
- 239000002002 slurry Substances 0.000 description 16
- 239000012535 impurity Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000009102 absorption Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000008364 bulk solution Substances 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- 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
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
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Abstract
The invention provides a method and a system for recycling desulfurized gypsum cleaning water. The method for recycling the desulfurized gypsum washing water comprises the following steps: step S1: cleaning desulfurized gypsum, and then dehydrating to obtain wastewater; step S2: performing electro-adsorption on the wastewater to obtain recycled water and strong brine; step S3: and cleaning the desulfurized gypsum by using the reuse water to obtain a desulfurized gypsum product. The method for recycling the desulfurized gypsum cleaning water can achieve the purposes of water saving, waste water reduction and the like while ensuring the desulfurized gypsum cleaning effect.
Description
Technical Field
The invention relates to the technical field of environmental engineering, in particular to a method and a system for recycling desulfurized gypsum cleaning water.
Background
About 90 percent of coal-fired power plants adopt a limestone-gypsum wet desulphurization process to carry out desulphurization treatment on sulfur-containing flue gas, and the byproduct of the desulphurization treatment is desulphurization gypsum, namely calcium sulfate dihydrate (CaSO)4·2H2O) which can be widely used as a raw material in the roadbed, cement industry, building material industry, soil restoration and improvement and the like.
At present, no operating condition is available for controlling the quality of the desulfurized gypsum product, the quality of the desulfurized gypsum product is generally poor, and the content of impurities exceeds the standard seriously. Therefore, the desulfurized gypsum produced by the power plant can hardly meet the quality requirements of gypsum raw materials in various fields.
However, a large amount of desulfurized gypsum can be treated and disposed of only as solid waste, resulting in a great waste of resources. Although the desulfurization gypsum produced in the power plant can be effectively cleaned and decontaminated, the power plant has a limited amount of water used and also has a limited amount of water discharged. Therefore, it is necessary to develop a water-saving wastewater recycling method and system to achieve the purposes of water saving and wastewater reduction while ensuring the cleaning effect of the desulfurized gypsum.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method and a system for recycling desulfurization gypsum cleaning water, which can achieve the purposes of water saving, waste water reduction and the like while ensuring the cleaning effect of desulfurization gypsum.
The invention provides a method for recycling desulfurized gypsum cleaning water, which comprises the following steps:
step S1: cleaning desulfurized gypsum, and then dehydrating to obtain wastewater;
step S2: performing electro-adsorption on the wastewater to obtain recycled water and strong brine;
step S3: and cleaning the desulfurized gypsum by using the reuse water to obtain a desulfurized gypsum product.
Further, the method for recycling the desulfurized gypsum washing water of the invention may further include the step S4: and evaporating and crystallizing the strong brine. At the moment, the method reduces the total water discharge amount by 100 percent at most, thereby realizing zero discharge of the desulfurization wastewater.
The present invention is not limited to the manner of obtaining desulfurized gypsum, and may be, for example, a by-product of a limestone-gypsum wet desulfurization process. Specifically, limestone slurry can be circularly pumped to the upper part of the absorption tower to form a spraying layer, meanwhile, an oxidation fan is used for providing necessary air quantity, reactions such as washing circulation, absorption, oxidation, crystallization and the like are carried out on sulfur-containing flue gas, solids in the slurry are continuously separated and discharged through a gypsum discharge pump, and the discharged gypsum slurry has certain temperature, pH and density; then, the gypsum slurry enters a gypsum slurry buffer tank, and the slurry with the solid content of about 8-15% is treated by a gypsum cyclone to obtain the gypsum slurry with the underflow of 40-50%; and overflowing about 5 percent of gypsum slurry to return to the desulfurizing tower. And the underflow is then sent to a feed box of a vacuum belt conveyor, dewatered by a vacuum belt dewaterer, optionally dewatered by adding a step of washing impurities, and dewatered to obtain the desulfurized gypsum with the water content of less than 10 percent.
The invention does not strictly limit the water quantity adopted by cleaning; specifically, the mass ratio of the water used for cleaning to the desulfurized gypsum may be (0.4-0.6): 1, preferably 0.5: 1.
The present invention is not limited to a strict dewatering method, and can be carried out by using a conventional dewatering device such as a vacuum belt dehydrator.
The electro-adsorption is a water quality desalination purification and concentration technology based on the theory of double electric layer capacitance, and the basic principle is that after low voltage is applied to electrodes, cations, anions or charged particles in solution respectively migrate to the two electrodes under the action of electric field force and concentration gradient and are adsorbed on the surfaces of the electrodes to form double electric layers, so that the aim of desalination or purification is fulfilled. Capacitive deionization forces ions to move towards oppositely charged electrodes by applying an electrostatic field. Because the electrode made of carbon material, such as activated carbon and carbon aerogel, not only has good conductivity, but also has large specific surface area, when placed in electrostatic field, strong electric double layer is generated at the interface of the electrode and electrolyte solution, and a large amount of electrolyte ions can be attracted and certain energy can be stored. Once the electric field is removed, the attracted ions are released into the bulk solution and the concentration in the solution increases. Thus, the processes of adsorption and desorption are completed.
In the invention, the mass ratio of the recycled water obtained by electro-adsorption to the concentrated brine is (8-9): (1-2). The amount of the reuse water in the invention reaches more than 80 percent, so the total water consumption can be reduced by more than 80 percent, and the water-saving effect is obvious.
Cl in the wastewater of the invention-The content is 6000-; cl in the desulfurized gypsum-Content (wt.)>2000 ppm; cl in the desulfurized gypsum product-Content (wt.)<300ppm。
The overall process of the present invention may include, for example: the washing water above the vacuum belt dehydrator washes the desulfurized gypsum containing impurities, and the washed water (containing a large amount of soluble impurities such as chloride ions and Cl)-6000-20000ppm), then separating by an electric adsorption method to form strong brine and reuse water, wherein the reuse water is used for washing the desulfurized gypsum again, and the strong brine is evaporated and crystallized, thereby realizing wastewater reduction or zero emission; experiments prove that the reuse water can continuously reduce the impurity content in the desulfurized gypsum.
The invention also provides a desulfurization gypsum cleaning water recycling system which comprises a cleaning device, a dehydration device, an electric adsorption device and a recycling device, wherein the cleaning device and the recycling device are respectively arranged above the dehydration device, the electric adsorption device is provided with a wastewater inlet and a recycling water outlet, the dehydration device is communicated with the wastewater inlet of the electric adsorption device, and the recycling device is communicated with the recycling water outlet of the electric adsorption device.
Further, the desulfurization gypsum washing water recycling system also comprises a wastewater collection box arranged between the dehydration device and the electric adsorption device.
Further, the desulfurization gypsum washing water recycling system also comprises a recycling water tank arranged between the electric adsorption device and the recycling device.
Furthermore, the desulfurized gypsum washing water recycling system also comprises a strong brine tank, the electric adsorption device is also provided with a strong brine outlet, and the strong brine tank is communicated with the strong brine outlet.
Furthermore, the desulfurization gypsum washing water recycling system also comprises an evaporation crystallization device, and the evaporation crystallization device is connected with the strong brine tank.
Further, the cleaning device and the recycling device comprise a cleaning water pipe and a plurality of cleaning spray heads arranged on the cleaning water pipe, and the cleaning spray heads are arranged towards the dehydration device.
The implementation of the invention has at least the following advantages:
1. the method solves the problem of treating the desulfurized gypsum cleaning wastewater, and forms 80-90% of recycled water and 10-20% of strong brine through electro-adsorption, so that the total water consumption can be reduced by more than 80%, and the water-saving effect is obvious;
2. the method provided by the invention can be used for evaporating and crystallizing the strong brine, so that the total water discharge is reduced by 100% to the maximum extent, and zero discharge of the desulfurization wastewater can be realized;
3. the reuse water can continuously reduce the impurity content in the desulfurized gypsum, and can achieve the purposes of water saving, waste water reduction and the like while ensuring the cleaning effect of the desulfurized gypsum.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a desulfurized gypsum washing water recycling system according to an embodiment of the present invention.
Description of reference numerals:
1: cleaning the water pipe; 2: cleaning the spray head; 3: a dewatering device; 4: a wastewater collection tank; 5: an electro-adsorption device; 6: a concentrated brine tank; 7: a recycling water tank; 8: recycling the water pipe; 9: and (5) recycling the spray head.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The desulfurized gypsum of each example can be obtained by:
the limestone slurry is circularly pumped to the upper part of the absorption tower to form a spraying layer, meanwhile, an oxidation fan is used for providing necessary air quantity to carry out washing circulation, absorption, oxidation, crystallization and other reactions on the sulfur-containing flue gas, the solid in the slurry is continuously separated and is discharged by a gypsum discharge pump, and the discharged gypsum slurry has certain temperature, pH and density; then, the gypsum slurry enters a gypsum slurry buffer tank, and the slurry with the solid content of about 8-15% is treated by a gypsum cyclone to obtain the gypsum slurry with the underflow of 40-50%; and overflowing about 5 percent of gypsum slurry to return to the desulfurizing tower. And the underflow is then sent to a feeding box of a vacuum belt conveyor, dewatered by a vacuum belt dewaterer, washed of impurities and dewatered again to obtain the desulfurized gypsum with the water content of less than 10 percent.
Example 1
The method for recycling the desulfurized gypsum washing water comprises the following steps:
s1: cleaning and dewatering
Washing desulfurized gypsum with chloride ion content of 2125ppm by using clean water with chloride ion content of 120ppm, and then dehydrating to obtain wastewater; wherein: the mass ratio of the clean water to the desulfurized gypsum is 0.5:1, the content of chloride ions in the desulfurized gypsum after cleaning is reduced to 230ppm, and the content of chloride ions in the wastewater is 5800 ppm.
S2: electric adsorption
Carrying out electro-adsorption treatment on the wastewater to obtain strong brine with the chloride ion content of 20000ppm and reuse water with the chloride ion content of 800 ppm; wherein the mass content of the reuse water is 85 percent, and the mass content of the concentrated brine is 15 percent.
S3: cleaning with recycled water
Continuously washing the desulfurized gypsum with the chloride ion content of 2125ppm by using the reuse water; wherein the mass ratio of the reuse water to the desulfurized gypsum is 0.5:1, and the content of chloride ions in the desulfurized gypsum after cleaning is reduced to 240 ppm.
S4: evaporative crystallization
And (3) evaporating and crystallizing the strong brine, thereby realizing waste water reduction or zero emission.
Example 2
The method for recycling the desulfurized gypsum washing water comprises the following steps:
s1: cleaning and dewatering
Washing the desulfurized gypsum with chloride ion content of 4680ppm by using clean water with chloride ion content of 120ppm, and then dehydrating to obtain wastewater; wherein: the mass ratio of the clean water to the desulfurized gypsum is 0.5:1, the content of chloride ions in the desulfurized gypsum after cleaning is reduced to 245ppm, and the content of chloride ions in the wastewater is 7200 ppm.
S2: electric adsorption
Performing electric adsorption treatment on the wastewater to obtain strong brine with the chloride ion content of 29000ppm and reuse water with the chloride ion content of 1600 ppm; wherein the mass content of the reuse water is 85 percent, and the mass content of the concentrated brine is 15 percent.
S3: cleaning with recycled water
Continuously cleaning the desulfurized gypsum with the chloride ion content of 4680ppm by using the recycled water; wherein the mass ratio of the reuse water to the desulfurized gypsum is 0.5:1, and the content of chloride ions in the desulfurized gypsum after cleaning is reduced to 297 ppm.
S4: the evaporation and crystallization fan is slow to meet
And (3) evaporating and crystallizing the strong brine, thereby realizing waste water reduction or zero emission.
Example 3
As shown in fig. 1, the desulfurization gypsum cleaning water recycling system of the present embodiment includes a cleaning device, a dewatering device 3, an electric adsorption device 5 and a recycling device, the cleaning device and the recycling device are respectively disposed above the dewatering device 3, the electric adsorption device 5 has a wastewater inlet and a recycling water outlet (not shown), the dewatering device 3 is communicated with the wastewater inlet of the electric adsorption device 5, and the recycling device is communicated with the recycling water outlet of the electric adsorption device 5.
The cleaning device is used for cleaning the desulfurized gypsum to remove impurities such as chloride ions in the desulfurized gypsum and improve the quality of desulfurized gypsum products; the specific structure of the cleaning apparatus is not strictly limited, and a structure conventional in the art may be employed.
Specifically, in the present embodiment, the washing device includes a washing water pipe 1 and a plurality of washing heads 2 provided on the washing water pipe 1, and the washing heads 2 are provided toward the dehydration device 3. The arrangement of the cleaning water pipe 1 and the cleaning nozzles 2 is not strictly limited, and the cleaning water pipe 1 of the present embodiment may be arranged, for example, in the width direction of the dehydration device 3 (for example, a vacuum belt dehydrator), and the plurality of cleaning nozzles 2 may be uniformly distributed on the cleaning water pipe 1, and the number of the cleaning nozzles 2 may be 4, for example. The cleaning device is arranged above the dehydration device 3, and the cleaning spray heads 2 are arranged towards the dehydration device 3, so that the cleaning water can well wash the desulfurized gypsum containing impurities.
The dewatering device 3 of the present embodiment is used for dewatering the washed desulfurized gypsum, and may employ a structure that is conventional in the art, such as a vacuum belt dewatering machine.
The electro-adsorption device 5 of the embodiment is used for desalting, purifying and concentrating wastewater formed by dehydration, and the basic principle is that after low voltage is applied to electrodes, cations, anions or charged particles in the wastewater respectively migrate to two electrodes under the action of electric field force and concentration gradient and are adsorbed on the surfaces of the electrodes to form an electric double layer, so that the aim of desalting or purifying is fulfilled.
After being treated by the electro-adsorption device 5, 80-90% of recycled water and 10-20% of strong brine can be formed, the total water consumption can be reduced by more than 80%, and the water-saving effect is obvious.
The recycling device of the embodiment is used for recycling the recycling water formed in the electric adsorption device 5 so as to clean the desulfurized gypsum; the specific structure of the recycling apparatus is not strictly limited, and a washing apparatus conventional in the art may be used.
In this embodiment, the recycling apparatus has a structure similar to that of the cleaning apparatus, and includes a recycling water pipe 8 and a plurality of recycling nozzles 9 disposed on the recycling water pipe 8, and the recycling nozzles 9 are disposed toward the dehydration apparatus 3. The specific arrangement of the recycling device and the cleaning device is not strictly limited, and they may be arranged above the dewatering device 3 in parallel at intervals.
The desulfurization gypsum washing water recycling system of the embodiment may further include a wastewater collection tank 4 disposed between the dehydration device 3 and the electro-adsorption device 5; at this time, the inlet end of the wastewater collection tank 4 is connected to the outlet end of the dehydration device 3, and the outlet end of the wastewater collection tank 4 is connected to the inlet end of the electro-adsorption device 5. The waste water collection tank 4 is mainly used for collecting waste water from the dewatering device 3.
The desulfurization gypsum cleaning water recycling system of the embodiment can further comprise a recycling water tank 7 arranged between the electric adsorption device 5 and the recycling device; at this time, the inlet end of the reuse water tank 7 is connected with the outlet end of the electro-adsorption device 5, and the outlet end of the reuse water tank 7 is connected with the inlet end of the reuse device. The reuse water tank 7 is mainly used for collecting reuse water from the electro-adsorption device 5.
The desulfurization gypsum washing water recycling system of the embodiment may further include a concentrated brine tank 6; it will be appreciated that the electro-adsorption device 5 also has a strong brine outlet, in which case the strong brine tank 6 is in communication with the strong brine outlet. The strong brine tank 6 is mainly used for collecting strong brine from the electro-adsorption device 5.
In particular, the system for recycling the desulfurized gypsum washing water of the present embodiment further comprises an evaporation crystallization device (not shown), wherein the evaporation crystallization device is connected to the concentrated brine tank 6 for carrying out evaporation crystallization on the concentrated brine. The mode reduces the total water discharge amount by 100 percent at most, thereby realizing zero discharge of the desulfurization wastewater.
The working process of the desulfurization gypsum washing water recycling system of the embodiment is as follows:
firstly, cleaning water is sprayed to the desulfurization gypsum through a cleaning water pipe 1 and a plurality of cleaning spray heads 2, so that the desulfurization gypsum containing impurities is washed to remove impurities such as chloride ions in the desulfurization gypsum; the cleaned desulfurized gypsum is dehydrated by a dehydrating device 3, and the wastewater formed by dehydration enters a wastewater collection box 4 through a wastewater pipe for storage. The wastewater in the wastewater collection box 4 is then put into an electric adsorption device 5 for electric adsorption treatment, and then is separated to form strong brine and reuse water; the strong brine flows out through a strong brine outlet and enters a strong brine tank 6 for storage, and is evaporated and crystallized through an evaporation and crystallization device, so that the wastewater reduction or zero emission is realized; the reuse water flows out through the reuse water outlet and enters the reuse water tank 7 for storage, and then the reuse water is sprayed to the desulfurization gypsum through the reuse water pipe 8 and the reuse spray heads 9 so as to continuously clean the desulfurization gypsum, thereby further continuously reducing the impurity content in the desulfurization gypsum.
The desulfurization gypsum cleaning water recycling system of the embodiment can achieve the purposes of water saving, wastewater reduction and the like while ensuring the cleaning effect of the desulfurization gypsum, can reduce the total water consumption by more than 80%, and has remarkable water saving effect; meanwhile, the system reduces the total water discharge by 100 percent at most, thereby realizing zero discharge of the desulfurization wastewater.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for recycling desulfurization gypsum cleaning water is characterized by comprising the following steps:
step S1: cleaning desulfurized gypsum, and then dehydrating to obtain wastewater;
step S2: performing electro-adsorption on the wastewater to obtain recycled water and strong brine;
step S3: cleaning the desulfurized gypsum by using the reuse water to obtain a desulfurized gypsum product;
preferably, the method further comprises the step S4: and evaporating and crystallizing the strong brine.
2. The method for recycling desulfurization gypsum washing water according to claim 1, wherein the mass ratio of water used for washing to desulfurization gypsum is (0.4-0.6): 1, preferably 0.5: 1.
3. The method for recycling desulfurized gypsum washing water according to claim 1, wherein the mass ratio of the recycled water obtained by electro-adsorption to the concentrated brine is (8-9): (1-2).
4. The method of claim 1, wherein the Cl in the wastewater is recovered-The content is 6000-; cl in the desulfurized gypsum-Content (wt.)>2000 ppm; cl in the desulfurized gypsum product-Content (wt.)<300ppm。
5. The desulfurization gypsum washing water recycling system is characterized by comprising a washing device, a dewatering device, an electric adsorption device and a recycling device, wherein the washing device and the recycling device are respectively arranged above the dewatering device, the electric adsorption device is provided with a wastewater inlet and a recycling water outlet, the dewatering device is communicated with the wastewater inlet of the electric adsorption device, and the recycling device is communicated with the recycling water outlet of the electric adsorption device.
6. The system for recycling desulfurized gypsum according to claim 5, further comprising a wastewater collection tank disposed between said dehydration unit and said electro-adsorption unit.
7. The desulfurization gypsum washing water recycling system according to claim 5, further comprising a recycling water tank disposed between the electro-adsorption device and the recycling device.
8. The system of claim 5, further comprising a brine tank, wherein the electro-adsorption device further comprises a brine outlet, and the brine tank is in communication with the brine outlet.
9. The system for recycling desulfurized gypsum according to claim 8, further comprising an evaporative crystallization device, said evaporative crystallization device being connected to said concentrated brine tank.
10. The system for recycling desulfurized gypsum according to claim 5, wherein said washing means and said recycling means comprise a water pipe and a plurality of spray heads disposed on said water pipe, said spray heads being disposed toward said dewatering means.
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| CN114314975A (en) * | 2021-09-01 | 2022-04-12 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Desulfurization wastewater treatment system and method |
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