CN114132995A - Coal chemical wastewater concentration and crystallization integrated and reclaimed water recovery device and method - Google Patents
Coal chemical wastewater concentration and crystallization integrated and reclaimed water recovery device and method Download PDFInfo
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- CN114132995A CN114132995A CN202111515010.5A CN202111515010A CN114132995A CN 114132995 A CN114132995 A CN 114132995A CN 202111515010 A CN202111515010 A CN 202111515010A CN 114132995 A CN114132995 A CN 114132995A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000000126 substance Substances 0.000 title claims abstract description 49
- 239000003245 coal Substances 0.000 title claims abstract description 45
- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 238000002425 crystallisation Methods 0.000 title claims abstract description 28
- 230000008025 crystallization Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000011084 recovery Methods 0.000 title claims description 18
- 238000004064 recycling Methods 0.000 claims abstract description 22
- 239000012528 membrane Substances 0.000 claims abstract description 21
- 238000004821 distillation Methods 0.000 claims abstract description 19
- 238000009833 condensation Methods 0.000 claims abstract description 14
- 230000005494 condensation Effects 0.000 claims abstract description 14
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000010354 integration Effects 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
Images
Classifications
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention provides a device and a method for integrating concentration and crystallization of coal chemical wastewater and recovering reclaimed water, wherein the device for integrating concentration and crystallization of coal chemical wastewater and recovering reclaimed water comprises a concentration system, a distillation system and a reclaimed water recycling system. The concentration system comprises a water inlet pump, a concentration tank, a salt collecting door, a heating rod and an air inlet valve, and the concentration tank is connected with the distillation system through a hydrophobic heat-insulating film; the distillation system comprises a low-pressure tank, a vacuum pump, a hydrophobic membrane, a pressure gauge and a flow guide pipe, wherein the vacuum pump is connected with the reclaimed water recycling system through the flow guide pipe; the reclaimed water recycling system comprises a condensation tank, a water inlet, a reclaimed water tank, an exhaust valve and a drain valve. The invention utilizes the characteristic of high temperature of the coal chemical industry wastewater, takes the membrane distillation technology as the core, carries out integrated treatment on concentration and crystallization, improves the treatment efficiency of the coal chemical industry wastewater, simultaneously recycles reclaimed water for reuse, and relieves the requirement on water consumption to a certain extent.
Description
Technical Field
The invention relates to an integrated reclaimed water recovery device and belongs to the technical field of environmental water treatment, in particular to a coal chemical wastewater concentration and crystallization integrated reclaimed water recovery device and a method.
Background
The coal chemical industry needs to consume a large amount of water resources. According to statistics, coal liquefaction consumes 6 tons of water/ton of oil and coal coking2.5 ton water/ton coke, coal-made natural gas consumption about 10 ton water/kNm3The natural gas, coal to olefins project consumes about 30 tons of water per ton of olefins. But the coal chemical industry enterprises in China are not matched with the regional distribution of water resources. Water sources in northwest areas, north China and other areas are scarce, but a large number of coal chemical plants are distributed.
According to the latest regulation of the national development and improvement commission, coal chemical enterprises need to reach the standard of 'zero discharge of liquid'. However, the components of the coal gas wastewater are very complex, the water contains high-concentration phenols, heterocyclic compounds, aromatic hydrocarbons, long-chain alkanes and ammonia nitrogen, the effluent water treated by a plurality of processes is still difficult to reach the standard, and the 'zero emission' standard is difficult to achieve. The development of the coal chemical industry is limited to a great extent by the treatment problem of the coal chemical industry wastewater.
Therefore, how to efficiently concentrate, evaporate and crystallize and recycle a large amount of generated wastewater becomes a difficult point and a hot point for treating wastewater in coal chemical industry.
The concentration and crystallization processes adopted at present are reverse osmosis and evaporation, but the problems of complex operation and high energy consumption exist. As the nano-filtration, evaporative condensation, reverse osmosis and evaporative condensation adopted in CN107311374A, the temperature required for evaporation is high, extra pressurization is required for nano-filtration and reverse osmosis, and the problem of membrane pollution is not solved well, which undoubtedly increases the treatment cost.
Disclosure of Invention
The invention aims to provide a device and a method for integrating concentration and crystallization of coal chemical wastewater and recovering reclaimed water,
in order to achieve the purpose, the invention adopts the following technical scheme:
a coal chemical wastewater concentration and crystallization integrated reclaimed water recovery device comprises a concentration system, a distillation system and a reclaimed water recycling system; the concentration system comprises a concentration tank, one side of the concentration tank is connected with a water inlet pump, a heating rod is arranged in the concentration tank, and the bottom of the concentration tank is provided with a salt collecting door; the top of the concentration tank is connected with a distillation system, the distillation system comprises a low-pressure tank and a vacuum pump, the low-pressure tank is connected with a pressure gauge, and the vacuum pump is connected with a reclaimed water recycling system through a guide pipe; the reclaimed water recycling system comprises a reclaimed water tank, a water inlet is formed in the bottom of the reclaimed water tank, and a drain valve is arranged on one side of the reclaimed water tank.
Preferably, the concentrating tank and the low-pressure tank are connected through a heat-insulating hydrophobic membrane for preventing heat loss and substances except water vapor from passing through.
Preferably, the heat-insulating hydrophobic membrane is made of PVDF or PTFE material, the pore diameter is 0.2-0.45 μm, and the membrane thickness is 0.1-0.3 mm.
Preferably, the reclaimed water tank in the reclaimed water recycling system adopts a double-layer structure, the outer layer of the double-layer structure is a condensation tank for condensing water vapor, the inner layer of the double-layer structure is a reclaimed water tank for collecting condensed water, and the water inlet and the flow guide pipe are distributed in a diagonal manner.
Preferably, the concentration tank is provided with an air inlet valve, the reclaimed water tank is provided with an exhaust valve, and the air inlet valve and the exhaust valve are used for balancing the air pressure of the whole system.
Preferably, concentrated jar passes through mortise and tenon joint structural connection with the low pressure jar, the easy access and observes the crystallization condition in the concentrated jar.
The invention also provides a coal chemical wastewater concentration and crystallization integration and reclaimed water recovery method, which comprises the following steps:
step S1: opening a water inlet pump to enable the coal chemical wastewater to enter a concentration tank;
step S2: opening the vacuum pump to reduce the pressure of the low-pressure tank;
step S3: opening an exhaust valve to enable gas pumped by a vacuum pump to enter a condensation tank;
step S4: opening a drain valve to discharge the collected condensed water for recycling;
step S5: and closing the water inlet pump, opening the air inlet valve, and opening the salt collecting door after the pressure is balanced to remove the crystallized substances.
Preferably, the concentration tank 12 is maintained at a temperature of 50-70 ℃.
Preferably, the low pressure tank 22 is maintained at a pressure of 1-5 kPa.
Preferably, the volume ratio of the low pressure tank 22 to the concentration tank 12 is 1:4 to 1:5, and the cross section of the condensation tank 31 is 5 to 10cm wide.
Compared with the prior art, the invention has the following advantages:
(1) the waste heat is recycled by utilizing the characteristic of high temperature of the coal chemical wastewater and applying a membrane distillation technology;
(2) the hydrophobic heat insulation film is used, so that heat loss is prevented, other pollutants are prevented from entering reclaimed water, and the water quality of the reclaimed water is ensured;
(3) a large amount of sewage is recycled, so that water resources are saved, and water use pressure is relieved.
The invention utilizes the characteristic of high temperature of the coal chemical industry wastewater, takes the membrane distillation technology as the core, carries out integrated treatment on concentration and crystallization, improves the treatment efficiency of the coal chemical industry wastewater, simultaneously recycles reclaimed water for reuse, and relieves the requirement on water consumption to a certain extent.
Drawings
FIG. 1 is a schematic structural diagram of an integrated concentrating and crystallizing and reclaimed water recycling device for coal chemical wastewater according to the present invention;
FIG. 2 is an enlarged view of portion A of the drawing illustrating the present invention;
FIG. 3 is a tank structure diagram of a low-pressure concentration tank of the integrated concentration and crystallization and reclaimed water recovery device for coal chemical wastewater of the present invention;
FIG. 4 is a tank structure diagram of a reclaimed water tank of the coal chemical wastewater concentration and crystallization integration and reclaimed water recovery device of the invention.
Reference numbers in the figures:
11-a water inlet pump; 12-a concentration tank; 13-salt trap door; 14-a heating rod; 15-an air inlet valve; 21-hydrophobic heat insulating film; 22-a low pressure tank; 23-a pressure gauge; 24-a vacuum pump; 25-a draft tube; 31-a condensation tank; 32-a water inlet; 33-a reclaimed water tank; 34-an exhaust valve; 35-a drain valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The invention discloses a device and a method for integrating concentration and crystallization of coal chemical wastewater and recovering reclaimed water, wherein the device comprises a concentration system, a distillation system and a reclaimed water recycling system; the concentration system comprises a water inlet pump 11, a concentration tank 12, a salt collecting door 13 and an air inlet valve 15; the concentration tank 12 is connected with a distillation system through a hydrophobic heat-insulating membrane 21; the distillation system comprises a low-pressure tank 22 and a vacuum pump 24, and the vacuum pump 24 is connected with the reclaimed water recycling system through a guide pipe 25; the reclaimed water recycling system comprises a condensation tank 31, a water inlet 32, a reclaimed water tank 33, an exhaust valve 34 and a drain valve 35;
the concentration system comprises a concentration tank 12, one side of the concentration tank 12 is connected with a water inlet pump 11, the other side of the concentration tank 12 is provided with an air inlet valve 15, a heating rod 14 is arranged in the concentration tank 12, and the bottom of the concentration tank 12 is provided with a salt collecting door 13; the top of the concentration tank 12 is connected with a distillation system, the distillation system comprises a low-pressure tank 22 and a vacuum pump 24, the low-pressure tank 22 is connected with a pressure gauge 23, and the vacuum pump 24 is connected with a reclaimed water recycling system through a guide pipe 25; the reclaimed water recycling system comprises a double-layer reclaimed water tank 33, the outer layer of the double-layer structure is a condensation tank 31 for condensing water vapor, the inner layer of the double-layer structure is the reclaimed water tank 33 for collecting condensed water, and the water inlet 32 and the guide pipe 25 are distributed in a diagonal manner; an exhaust valve 34 is arranged at the bottom of the intermediate water tank 33, a water inlet 32 is arranged at one side of the bottom of the intermediate water tank 33, a drain valve 35 is arranged at the middle part of the intermediate water tank 33, and the drain valve 35 is positioned above the water inlet 32. The intake valve 15 and the exhaust valve 34 in the present application are used to equalize the air pressure of the entire system.
Further, the concentration tank 12 and the low pressure tank 22 are connected by a heat insulating hydrophobic membrane 21 for preventing heat loss and the passage of substances other than water vapor.
Furthermore, the heat-insulating hydrophobic membrane 21 is made of PVDF or PTFE material, the aperture is 0.2-0.45 μm, and the membrane thickness is 0.1-0.3 mm.
Further, concentrated jar 12 passes through mortise and tenon joint structural connection with low pressure jar 22, and the condition of crystallization in the concentrated jar 12 of convenient to overhaul and observation.
The invention discloses a coal chemical wastewater concentration and crystallization integration and recycling method, which comprises the following steps:
step S1: a water inlet pump 11 is opened, so that the coal chemical wastewater enters a concentration tank 12;
step S2: turning on the vacuum pump 24 to reduce the pressure of the low-pressure tank;
step S3: opening the exhaust valve 34 to make the gas pumped out by the vacuum pump 24 enter the condensation tank 31;
step S4: opening the drain valve 35 to discharge the collected condensed water for recycling;
step S5: the water inlet pump 11 is closed, the air inlet valve 34 is opened, and the salt collecting door 13 is opened after the pressure is balanced to remove the crystallized substances.
Further, the temperature of the concentration tank 12 is maintained at 50 to 70 ℃ and the pressure of the low pressure tank 22 is maintained at 1 to 5 kPa.
Further, the volume ratio of the low-pressure tank 22 to the concentration tank 12 is 1:4-1:5, and the cross section of the condensation tank 31 is 5-10cm wide.
The following detailed description is given with reference to specific data of the examples:
example one
Treating the effluent of biochemical section of a chemical plant in a certain park, wherein the treatment capacity is 1t/d, the temperature of the sewage in the concentration tank is 55 ℃, the pressure in the low-pressure tank is 2kPa, a PVDF membrane with the aperture of 0.2 mu m is used, the thickness of the membrane is 0.3mm, and the recovery water amount is 700L.
Example two
The treatment capacity of the pretreated coal chemical wastewater is 2t/d, the sewage temperature in the concentration tank is 70 ℃, the pressure in the low-pressure tank is 5kPa, a PTFE (polytetrafluoroethylene) membrane with the aperture of 0.4 mu m is used, the membrane thickness is 0.3mm, and the reclaimed water amount is 1.2 t.
The invention has the following advantages:
(4) the waste heat is recycled by utilizing the characteristic of high temperature of the coal chemical wastewater and applying a membrane distillation technology;
(5) the hydrophobic heat insulation film is used, so that heat loss is prevented, other pollutants are prevented from entering reclaimed water, and the water quality of the reclaimed water is ensured;
(6) a large amount of sewage is recycled, so that water resources are saved, and water use pressure is relieved.
The invention utilizes the characteristic of high temperature of the coal chemical industry wastewater, takes the membrane distillation technology as the core, carries out integrated treatment on concentration and crystallization, improves the treatment efficiency of the coal chemical industry wastewater, simultaneously recycles reclaimed water for reuse, and relieves the requirement on water consumption to a certain extent.
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 equipment 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A coal chemical wastewater concentration and crystallization integrated and reclaimed water recovery device is characterized by comprising a concentration system, a distillation system and a reclaimed water recycling system; the concentration system comprises a concentration tank (12), one side of the concentration tank (12) is connected with a water inlet pump (11), a heating rod (14) is arranged in the concentration tank (12), and the bottom of the concentration tank (12) is provided with a salt collecting door (13); the top of the concentration tank (12) is connected with a distillation system, the distillation system comprises a low-pressure tank (22) and a vacuum pump (24), the low-pressure tank (22) is connected with a pressure gauge (23), and the vacuum pump (24) is connected with a reclaimed water recycling system through a guide pipe (25); the reclaimed water recycling system comprises a reclaimed water tank (33), a water inlet (32) is formed in the bottom of the reclaimed water tank (33), and a drain valve (35) is arranged on one side of the reclaimed water tank (33).
2. The integrated concentrating and crystallizing and reclaimed water recycling device for coal chemical wastewater as claimed in claim 1, wherein the concentrating tank (12) and the low pressure tank (22) are connected through a heat-insulating hydrophobic membrane (21) for preventing heat loss and substances except water vapor from passing through.
3. The coal chemical wastewater concentration and crystallization integrated reclaimed water recovery device according to claim 2, wherein the heat-insulating hydrophobic membrane (21) is made of PVDF or PTFE material, the pore diameter is 0.2-0.45 μm, and the membrane thickness is 0.1-0.3 mm.
4. The coal chemical industry wastewater concentration and crystallization integration and reclaimed water recovery device as claimed in claim 1, wherein the reclaimed water tank (33) in the reclaimed water recycling system is of a double-layer structure, the outer layer of the double-layer structure is a condensation tank (31) for condensing water vapor, the inner layer of the double-layer structure is the reclaimed water tank (33) for collecting condensed water, and the water inlet (32) and the flow guide pipe (25) are distributed diagonally.
5. The integrated coal chemical wastewater concentration and crystallization and reclaimed water recovery device according to claim 1, wherein an air inlet valve (15) is arranged on the concentration tank (12), an air outlet valve (34) is arranged on the reclaimed water tank (33), and the air inlet valve (15) and the air outlet valve (34) are used for balancing the air pressure of the whole system.
6. The integrated coal chemical wastewater concentration and crystallization and reclaimed water recovery device according to claim 1, wherein the concentration tank (12) is connected with the low-pressure tank (22) through a mortise and tenon joint structure, so that the maintenance and observation of the crystallization condition in the concentration tank (12) are facilitated.
7. A coal chemical industry wastewater concentration and crystallization integration and reclaimed water recovery method is characterized by comprising the following steps:
step S1: a water inlet pump (11) is opened, so that the coal chemical wastewater enters a concentration tank (12);
step S2: turning on the vacuum pump (24) to reduce the pressure in the low-pressure tank (22);
step S3: opening an exhaust valve (34) to enable the gas pumped by the vacuum pump (24) to enter a condensation tank (31);
step S4: opening a drain valve (35) to discharge the collected condensed water for recycling;
step S5: and (3) closing the water inlet pump (11), opening the air inlet valve (34), and opening the salt collecting door (13) after the pressure is balanced to remove the crystallized substances.
8. The coal chemical industry wastewater concentration and crystallization integration and reclaimed water recovery method according to claim 7, characterized in that: the temperature of the concentration tank (12) is kept between 50 and 70 ℃.
9. The coal chemical industry wastewater concentration and crystallization integration and reclaimed water recovery method according to claim 7, characterized in that: the pressure of the low-pressure tank (22) is kept between 1 and 5 kPa.
10. The coal chemical industry wastewater concentration and crystallization integration and reclaimed water recovery method according to claim 7, characterized in that: the volume ratio of the low-pressure tank (22) to the concentration tank (12) is 1:4-1:5, and the cross section of the condensation tank (31) is 5-10cm wide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111515010.5A CN114132995A (en) | 2021-12-13 | 2021-12-13 | Coal chemical wastewater concentration and crystallization integrated and reclaimed water recovery device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111515010.5A CN114132995A (en) | 2021-12-13 | 2021-12-13 | Coal chemical wastewater concentration and crystallization integrated and reclaimed water recovery device and method |
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Application publication date: 20220304 |