CN214167680U - Coal mine water drainage system - Google Patents
Coal mine water drainage system Download PDFInfo
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- CN214167680U CN214167680U CN202121863177.6U CN202121863177U CN214167680U CN 214167680 U CN214167680 U CN 214167680U CN 202121863177 U CN202121863177 U CN 202121863177U CN 214167680 U CN214167680 U CN 214167680U
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Abstract
The utility model discloses a coal mine water drainage system, which comprises a precipitation device, a first filtering device, a second filtering device and a crystallization device which are connected in sequence; the second filtering device comprises a weak acid cation bed, a decarbonization water tank, a nanofiltration device and an optional reverse osmosis device; the number of the nanofiltration devices is more than or equal to 1, and the number of the reverse osmosis devices is more than or equal to 0; the inlet of the precipitation device is used for introducing coal mine water; at least one outlet of the second filtering device and the first outlet of the crystallizing device are respectively connected with the water return pool, and the second outlet of the crystallizing device is used for collecting sodium sulfate crystallized salt. The system has simple flow, adopts the nanofiltration salt separation technology aiming at the characteristics of low COD and high sulfate of the coal chemical industry mine water, extracts high-purity sodium sulfate crystal salt, and simultaneously realizes the recycling of nanofiltration produced water, so that the operation cost is 50 percent lower than that of the conventional zero-discharge process.
Description
Technical Field
The utility model relates to a water treatment field, concretely relates to colliery mine water discharge system.
Background
In the coal mining process, the water discharge is large, the average water discharge per ton of coal is 2-2.5 t, the salt content in mine water is high, and the salt content of the mine water mainly comes from Ca2+、Mg2+、Na+、K+、SO4 2-、HCO3-、Cl-Plasma, direct discharge not only can lead to land salinization or pH value unbalance, also can cause very big waste to the water resource simultaneously, in addition, has still greatly restricted coal mine enterprise's normal production. With the attention of people on environmental protection, the discharge of mine water also has new requirements. The Shandong province promulgates the part 1 of the drainage basin water pollutant comprehensive emission standard: eastern Wen lake basin of south four lakes (Shandong DB37_ 3416.1-2018), where TDS requires<1600mg/L, sulfate radical requirement<650mg/L。
In order to meet the requirement of environmental protection at the present stage and realize the recycling of water resources, various coal mine water zero-discharge technologies are available in the market at present. CN213085655U discloses a low-cost mine water purification treatment system, which comprises a pretreatment unit, a desalting unit, a chemical softening unit, a concentration and crystallization unit and a reverse osmosis unit; wherein, the water outlet of producing of pretreatment unit is connected with the water inlet of desalination unit, and the dense water export of desalination unit is connected with the water inlet of chemical softening unit, and the water outlet of producing of chemical softening unit is connected with the water inlet of concentrated crystallization unit. CN112919717A discloses a mine water's wisdom desalination system, through the coordination of first grade advanced treatment system, second grade advanced treatment system, wisdom evaporative crystallization system and solid useless processing system, forms the wisdom desalination system that the real-time online regulation and control of intellectuality, easy operation, pollutant interception are effectual. The process is similar to the coal chemical industry zero emission technology, adopts the technology of all crystallization and salt separation (sodium sulfate and sodium chloride), and has high investment cost and operation cost; in addition, a small amount of miscellaneous salts is generated while all crystals are separated into salts, and the disposal cost of the miscellaneous salts is high. CN112194307A discloses a coal mine water resource comprehensive utilization system and method, which only recovers sodium sulfate, but the method has long process flow and high operation and maintenance cost.
Therefore, the development of the discharge system which is simple in process, low in operation cost and capable of realizing resource completeness of the coal chemical industry mine water is of great significance.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a colliery mine water discharge system in order to overcome among the prior art colliery mine water discharge system investment cost and operation cost height, the flow is complicated, and can produce miscellaneous salt, and miscellaneous salt deals with the problem that the expense is high. The utility model discloses a colliery mine water discharge system is to the characteristics of the low COD of coal chemical industry mine water, high sulphate, extracts the sodium sulphate crystalline salt that the content is the highest and have the most retrieval and utilization to it is up to standard to ensure reuse water quality of water with the lowest cost, makes colliery mine water realize the zero release, realizes complete resource utilization.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the coal mine water drainage system comprises a precipitation device, a first filtering device, a second filtering device and a crystallization device which are connected in sequence;
the second filtration device comprises a weak acid cation bed, a decarbonization water tank, a nanofiltration device and an optional reverse osmosis device; the number of the nanofiltration devices is more than or equal to 1, and the number of the reverse osmosis devices is more than or equal to 0;
the weak acid cation bed and the decarburization water pool are arranged in any one of the following conditions A1-A5:
a1: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 0, the nanofiltration devices and the crystallization devices are sequentially arranged between each other;
a2: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 1, the nanofiltration devices and the reverse osmosis devices are sequentially arranged between each other;
a3: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 2, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the reverse osmosis devices or between the nanofiltration devices and the reverse osmosis devices;
a4: when the number of the nanofiltration devices is 2 and the number of the reverse osmosis devices is 1, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the nanofiltration devices or between the nanofiltration devices and the reverse osmosis devices;
a5: when the number of the nanofiltration devices is more than 1 and the number of the reverse osmosis devices is more than 1, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the nanofiltration devices or between the reverse osmosis devices and the reverse osmosis devices;
the inlet of the precipitation device is used for introducing coal mine water;
and at least one outlet of the second filtering device and the first outlet of the crystallizing device are respectively connected with the water return pool, and the second outlet of the crystallizing device is used for collecting sodium sulfate crystallized salt.
Those skilled in the art know that the backwater pool can store recycled water for recycling or discharge.
The sequential arrangement of the weak acid cation bed and the decarbonization water tank means that the weak acid cation bed is positioned at the upstream of the decarbonization water tank, and the weak acid cation bed and the decarbonization water tank are sequentially arranged at the upstream and the downstream.
The utility model discloses in, preferably, colliery mine water discharge system still including set up in the equalizing basin in sediment device upper reaches.
The conditioning tank may be conventional in the art. The adjusting tank is mainly used for adjusting water quantity, balancing water quality and pretreating coal mine water.
In the present invention, the precipitation device may be conventional in the art.
Preferably, the sedimentation device is a high-density tank, an efficient sedimentation tank, a coagulation sedimentation tank or a mechanical stirring clarification tank, and more preferably a high-density tank. The high density tank can remove most suspended matters, hardness, silicon and partial organic matters.
Preferably, the high-density pond comprises a coagulation area, a flocculation area, a sedimentation area and a sludge concentration area which are connected in sequence.
The utility model discloses in, preferably, another export of sediment device links to each other with sludge treatment system, sludge treatment system includes mud backward flow, mud emission, charge device and control system.
The sludge treatment system may be conventional in the art. The sludge treatment system is connected with the other outlet of the high-density tank and is used as an auxiliary system of the high-density tank. The sludge backflow in the sludge treatment system refers to that the sludge in the sedimentation zone of the high-density pond flows back to the flocculation zone through a sludge pump; the sludge discharge refers to discharging the sludge in the settling zone of the high-density pond to a sludge dewatering device through a sludge pump, and carrying out outward treatment after dewatering; the dosing device is used for dosing a flocculating agent to ensure the sludge dewatering effect; the control system refers to an electric automatic control device of the device unit.
The utility model discloses in, preferably, colliery mine water discharge system still including set up in deposit the device with middle pond between the first filter equipment.
The intermediate water basin may be conventional in the art. The middle water tank can be used as a temporary storage place for collecting the filtered produced water so as to facilitate the lifting of the filtered produced water to a subsequent treatment unit.
In the present invention, the first filtering device may be conventional in the art.
Preferably, the first filter device is a multi-media filter, an activated carbon filter, a V-shaped filter, a sand filter or an activated carbon filter, and more preferably a multi-media filter.
The multimedia filter may further remove a substantial portion of suspended matter, e.g., suspended particles above 10 microns and harmful to the membrane, etc.
The filter media in the multimedia filter may be conventional in the art. Preferably, a filter material layer of quartz sand and anthracite is arranged in the multi-medium filter.
The utility model discloses in, preferably, colliery mine water discharge system still including set gradually in first filter equipment with ultrafiltration device and ultrafiltration product pond between the second filter equipment.
The ultrafiltration device is a technology for removing impurities in liquid by a mechanical screening principle, and has efficient and stable interception effect on suspended matters, colloid, bacteria and microorganisms; and pollutants such as suspended matters and the like can be further removed by using the ultrafiltration device after the multi-medium filter, and concentrated water filtered by the ultrafiltration device sequentially enters the ultrafiltration water production tank and the second filtration device.
The utility model discloses in, preferably, reverse osmosis unit's number is 0~3, for example 0, 1, 2.
In the utility model, preferably, the second filtering device is a nanofiltration device.
Preferably, one outlet of the nanofiltration device is connected with the water return tank.
Preferably, the number of the nanofiltration devices is 2-5, such as 2, 3, 4 or 5, and the nanofiltration devices are connected in series in sequence.
Preferably, the number of the nanofiltration devices is 3, and the nanofiltration devices are respectively a primary nanofiltration device, a secondary nanofiltration device and a tertiary nanofiltration device.
Preferably, an outlet of the primary nanofiltration device is connected with the water return tank.
Generally, the water produced by the secondary nanofiltration device and the tertiary nanofiltration device can be recycled to the inlet of the primary nanofiltration device or directly discharged to the recycling tank according to the water quality condition.
The nanofiltration device may be conventional in the art. Preferably, the nanofiltration device is a nanofiltration membrane.
As known to those skilled in the art, the nanofiltration membrane is a membrane with nanometer-scale holes, and is between ultrafiltration and reverse osmosis, and has a certain rejection rate for inorganic salts and a molecular weight for organic substances of 200-1000 Dalton; the nanofiltration membrane has a certain rejection rate on inorganic salts because a surface separation layer of the nanofiltration membrane is composed of polyelectrolyte, has electrostatic interaction on ions, and has a good separation effect on monovalent salts and divalent salts.
In particular, the primary nanofiltration device can effectively trap divalent salts.
Preferably, the coal mine water drainage system further comprises a primary nanofiltration concentrated water tank which is sequentially arranged between the primary nanofiltration device and the secondary nanofiltration device.
Preferably, the weak acid cation bed and the decarbonization water tank are sequentially arranged between the primary nanofiltration device and the secondary nanofiltration device and are positioned at the downstream of the primary nanofiltration concentrated water tank.
The trapped concentrated water can be subjected to hardness removal and softening through the weak acid cation bed, and residual CO in the water can be removed through the decarburization water tank2。
Preferably, the coal mine water drainage system further comprises a secondary nanofiltration concentrated water tank arranged between the secondary nanofiltration device and the tertiary nanofiltration device.
Through the three-stage series nanofiltration device, the obtained concentrated water is mainly sodium sulfate which is highly concentrated.
In the utility model discloses, the crystallization device can adopt the conventional crystallization equipment in this field to obtain the crystallization salt.
Preferably, the crystallization device is a multi-effect evaporator, an MVR evaporator or a continuous freezing crystallizer.
Heating the evaporation solution to change the solution from unsaturated to saturated, continuing to evaporate, and separating out excessive solute in the form of crystals to obtain high-purity sodium sulfate crystal salt; or the sodium sulfate solubility reaches the lowest point by freezing the mirabilite, and the solution begins to separate out ice crystals when the temperature is continuously reduced.
The utility model discloses in, preferably, colliery mine water discharge system still including set up in the refrigerating plant in crystallization device low reaches. By combining crystallization with freezing, a higher purity of the extracted sodium sulphate can be ensured.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The reagent and the raw material used in the utility model are available on the market.
The utility model discloses an actively advance the effect and lie in:
(1) the traditional thermal method evaporation crystallization has high operation energy consumption, and the operation cost accounts for most of the waste water zero discharge cost; the utility model aims at the characteristics of low COD and high sulfate of the mine water in the coal chemical industry, simultaneously utilizes the characteristic of high retention rate of sulfate by a nanofiltration membrane, adopts the nanofiltration salt separation technology, realizes the recycling of nanofiltration produced water, the recycling rate of the produced water reaches 85-90%, and the produced water meets the recycled water quality specified in reclaimed water quality standard HG-T3923-2007 for recirculated cooling water; and subsequently, only concentrated water accounting for 2-4% of the total water amount needs to be evaporated and crystallized, and the operation cost is reduced by 50% compared with that of the conventional zero-emission process.
(2) The utility model discloses a discharge system flow is simple, and equipment investment reduces, and the control point reduces, and system operational reliability is high.
(3) The sodium chloride product that draws in to waste water on the market holds the state of question, the utility model discloses to the characteristics that mine water contains high sulfate, draw most valuable sodium sulfate crystal salt, the sodium sulfate salt purity of extraction is up to more than 99%, satisfies first-class requirement of "industry anhydrous sodium sulfate" (GB/T6009) 2014), can ensure that the crystal salt can really realize the resourceization.
Drawings
FIG. 1 is a schematic view of a coal mine water drainage system according to an embodiment of the present invention;
reference numerals:
1-a regulating reservoir; 2-high density pond; 3-an intermediate water tank; 4-a multi-media filter; 5-an ultrafiltration device; 6-ultrafiltration water-producing pool; 7-a first-stage nanofiltration device; 8-a first-stage nanofiltration concentrated water tank; 9-weak acid cation bed; 10-a decarbonization water tank; 11-a secondary nanofiltration device; 12-a secondary nanofiltration concentrated water tank; 13-a three-stage nanofiltration device; 14-a multi-effect evaporator; 15-a water return pool; 16-sludge treatment system.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Examples
The embodiment provides a coal mine water drainage system, and a schematic diagram of the coal mine water drainage system is shown in figure 1.
The discharge system comprises a precipitation device, a first filtering device, a second filtering device and a crystallization device which are sequentially connected, wherein the precipitation device is a high-density pool 2, the first filtering device is a multi-medium filter 4, the second filtering device is a nanofiltration device, and the crystallization device is a multi-effect evaporator 14.
Wherein, high-density pond 2 is including the district that thoughtlessly congeals that connects gradually, flocculation area, settling zone and sludge thickening district, can get rid of most suspended solid, hardness, silicon and some organic matters. The multi-media filter 4 is provided with a filter material layer of quartz sand and anthracite, and can further remove most suspended matters, such as suspended particles which are more than 10 microns and harmful to the membrane. The number of the nanofiltration devices is 3, and the nanofiltration devices are a primary nanofiltration device 7, a secondary nanofiltration device 11 and a tertiary nanofiltration device 13 which are sequentially connected in series; the nanofiltration device is a nanofiltration membrane and can effectively intercept divalent salt. The multi-effect evaporator 14 heats the evaporation solution to change the solution from unsaturated to saturated, and then the evaporation is continued, so that the excessive solute is precipitated as crystals, and the high-purity sodium sulfate crystal salt is obtained.
An inlet of the high-density pool 2 is used for introducing coal mine water, an outlet of the primary nanofiltration device 7 and a first outlet of the multi-effect evaporator 14 are respectively connected with an inlet of a water return pool 15, and the water return pool 15 stores recycled water for recycling or discharging; a second outlet of multiple effect evaporator 14 is used to collect sodium sulfate crystalline salts. Wherein, the water amount flowing into the water return tank 15 through the outlet of the primary nanofiltration device 7 is 85-90% of the water amount flowing through the primary nanofiltration device 7.
In addition, a regulating tank 1 is arranged at the upstream of the high-density tank 2, and the regulating tank 1 is used for homogenizing water quality. The other outlet of the high-density tank 2 is connected with a sludge treatment system 16, the sludge treatment system 16 is used as an auxiliary system of the high-density tank 2 and comprises sludge backflow, sludge discharge, a chemical adding device and a control system, and the sludge backflow refers to that sludge in a settling zone of the high-density tank 2 flows back to a flocculation zone through a sludge pump; the sludge discharge refers to discharging the sludge in the settling zone of the high-density pond 2 to a sludge dewatering device through a sludge pump, and carrying out outward treatment after dewatering; the dosing device is used for dosing a flocculating agent to ensure the sludge dewatering effect; the control system refers to an electric automatic control device of the device unit.
An intermediate water tank 3 is also arranged between the high-density tank 2 and the multi-medium filter 4, and the intermediate water tank 3 is used for buffering water quality. An ultrafiltration device 5 and an ultrafiltration water-producing tank 6 are sequentially arranged between the multi-medium filter 4 and the nanofiltration device, and the ultrafiltration device 5 has high-efficiency and stable interception effect on suspended matters, colloids, bacteria and microorganisms; the ultrafiltration device 5 is used after the multi-medium filter 4 to further remove pollutants such as suspended matters, and the concentrated water filtered by the ultrafiltration device 5 sequentially enters the ultrafiltration water production tank 6 and the nanofiltration device.
A primary nanofiltration concentrated water tank 8 is also arranged between the primary nanofiltration device 7 and the secondary nanofiltration device 11, and a weak acid cation bed 9 and a decarburization water tank 10 are also sequentially arranged between the primary nanofiltration device 7 and the secondary nanofiltration device 11 and are positioned at the downstream of the primary nanofiltration concentrated water tank 8. The trapped concentrated water can be subjected to hardness removal and softening through the weak acid cation bed 9, and residual CO in the water can be removed through the decarbonization water tank 102. A second-stage nanofiltration concentrated water tank 12 is arranged between the second-stage nanofiltration device 11 and the third-stage nanofiltration device 13. The concentrated water obtained by the filtration of the nanofiltration device connected in series at the three stages is mainly highly concentrated sodium sulfate.
The utility model aims at the characteristics of low COD and high sulfate of the mine water in the coal chemical industry, utilizes the characteristic of high retention rate of sulfate by a nanofiltration membrane, adopts a nanofiltration salt separation technology, realizes the recycling of nanofiltration produced water, has the recycling rate of the produced water reaching 85-90 percent, and ensures that the produced water meets the recycled water quality specified in reclaimed water quality standard HG-T3923-2007 for recirculated cooling water; and subsequently, only concentrated water accounting for 2-4% of the total water amount needs to be evaporated and crystallized, and the operation cost is reduced by 50% compared with that of the conventional zero-emission process.
Claims (10)
1. The coal mine water drainage system is characterized by comprising a precipitation device, a first filtering device, a second filtering device and a crystallization device which are connected in sequence;
the second filtration device comprises a weak acid cation bed, a decarbonization water tank, a nanofiltration device and an optional reverse osmosis device; the number of the nanofiltration devices is more than or equal to 1, and the number of the reverse osmosis devices is more than or equal to 0;
the weak acid cation bed and the decarburization water pool are arranged in any one of the following conditions A1-A5:
a1: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 0, the nanofiltration devices and the crystallization devices are sequentially arranged between each other;
a2: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 1, the nanofiltration devices and the reverse osmosis devices are sequentially arranged between each other;
a3: when the number of the nanofiltration devices is 1 and the number of the reverse osmosis devices is 2, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the reverse osmosis devices or between the nanofiltration devices and the reverse osmosis devices;
a4: when the number of the nanofiltration devices is 2 and the number of the reverse osmosis devices is 1, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the nanofiltration devices or between the nanofiltration devices and the reverse osmosis devices;
a5: when the number of the nanofiltration devices is more than 1 and the number of the reverse osmosis devices is more than 1, the nanofiltration devices or the reverse osmosis devices are sequentially arranged between the nanofiltration devices or between the reverse osmosis devices and the reverse osmosis devices;
the inlet of the precipitation device is used for introducing coal mine water;
and at least one outlet of the second filtering device and the first outlet of the crystallizing device are respectively connected with the water return pool, and the second outlet of the crystallizing device is used for collecting sodium sulfate crystallized salt.
2. The coal mine water drainage system of claim 1, wherein the coal mine water drainage system meets one or more of the following conditions:
the coal mine water discharge system also comprises a regulating reservoir arranged at the upstream of the sedimentation device;
the sedimentation device is a high-density tank, a high-efficiency sedimentation tank, a coagulation sedimentation tank or a mechanical stirring clarification tank;
the other outlet of the sedimentation device is connected with a sludge treatment system, and the sludge treatment system comprises sludge backflow, sludge discharge, a dosing device and a control system.
3. The coal mine water drainage system of claim 2, wherein the settling device is a high density pond.
4. The coal mine water drainage system according to claim 3, wherein the high-density pond comprises a coagulation zone, a flocculation zone, a sedimentation zone and a sludge concentration zone which are connected in sequence.
5. The coal mine water drainage system of claim 1, wherein the coal mine water drainage system meets one or more of the following conditions:
the coal mine water drainage system also comprises an intermediate water tank arranged between the sedimentation device and the first filtering device;
the first filtering device is a multi-media filter, an activated carbon filter, a V-shaped filtering pool, a sand filtering pool or an activated carbon filtering pool;
the coal mine water discharge system also comprises an ultrafiltration device and an ultrafiltration water generating tank which are sequentially arranged between the first filter device and the second filter device;
the crystallization device is a multi-effect evaporator, an MVR evaporator or a continuous freezing crystallizer;
the coal mine water drainage system also comprises a refrigerating device arranged at the downstream of the crystallizing device.
6. The coal mine water drainage system of claim 5, wherein the first filter device is a multi-media filter.
7. The coal mine water drainage system according to claim 6, wherein a filter bed of quartz sand and anthracite is provided in the multi-media filter.
8. The coal mine water drainage system of claim 1, wherein the coal mine water drainage system meets one or more of the following conditions:
the number of the nanofiltration devices is 2-5, and the nanofiltration devices are sequentially connected in series;
the number of the reverse osmosis devices is 0-3.
9. The coal mine water drainage system of claim 8, wherein the coal mine water drainage system meets one or more of the following conditions:
an outlet of the nanofiltration device is connected with the water return tank;
the number of the nanofiltration devices is 3, and the nanofiltration devices are respectively a primary nanofiltration device, a secondary nanofiltration device and a tertiary nanofiltration device;
the nanofiltration device is a nanofiltration membrane.
10. The coal mine water drainage system of claim 9, wherein the coal mine water drainage system meets one or more of the following conditions:
the coal mine water drainage system also comprises a primary nanofiltration concentrated water tank which is sequentially arranged between the primary nanofiltration device and the secondary nanofiltration device;
the weak acid cation bed and the decarbonization water tank are sequentially arranged between the primary nanofiltration device and the secondary nanofiltration device and are positioned at the downstream of the primary nanofiltration concentrated water tank;
the coal mine water drainage system also comprises a secondary nanofiltration concentrated water tank arranged between the secondary nanofiltration device and the tertiary nanofiltration device;
and an outlet of the primary nanofiltration device is connected with the water return tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115974211A (en) * | 2023-01-05 | 2023-04-18 | 中煤科工西安研究院(集团)有限公司 | High-salinity mine water zero-discharge purification and deep-layer reinjection synergistic system and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115974211A (en) * | 2023-01-05 | 2023-04-18 | 中煤科工西安研究院(集团)有限公司 | High-salinity mine water zero-discharge purification and deep-layer reinjection synergistic system and process |
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Address after: 315700 no.929 Binhai Avenue, Danxi street, Xiangshan County, Ningbo City, Zhejiang Province (main building) 1802-01 Patentee after: China Film (Zhejiang) Environmental Protection Technology Co.,Ltd. Address before: 315700 no.929 Binhai Avenue, Danxi street, Xiangshan County, Ningbo City, Zhejiang Province (main building) 1802-01 Patentee before: Sinochem (Zhejiang) Membrane Industry Development Co.,Ltd. |
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