CN115231717B - High-salt organic wastewater treatment system and technology based on EVAIR technology - Google Patents
High-salt organic wastewater treatment system and technology based on EVAIR technology Download PDFInfo
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- CN115231717B CN115231717B CN202211032010.4A CN202211032010A CN115231717B CN 115231717 B CN115231717 B CN 115231717B CN 202211032010 A CN202211032010 A CN 202211032010A CN 115231717 B CN115231717 B CN 115231717B
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- 238000005516 engineering process Methods 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 239000002699 waste material Substances 0.000 claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 239000003570 air Substances 0.000 claims description 103
- 238000001704 evaporation Methods 0.000 claims description 52
- 230000008020 evaporation Effects 0.000 claims description 47
- 230000005540 biological transmission Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 239000013049 sediment Substances 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000012080 ambient air Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 12
- 238000009835 boiling Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to a wastewater treatment technology, in particular to a high-salt organic wastewater treatment system and a high-salt organic wastewater treatment technology based on an EVAIR technology, wherein an internal heat exchange structure is arranged in a water production tank and a wastewater tank, the internal heat exchange structure in the water production tank is a first heat exchange structure, and the internal heat exchange structure in the wastewater tank is a second heat exchange structure; the first heat exchange structure, the second circulation structure, the first circulation structure and the blower are in mechanical fit with each other; the first heat exchange structure, the second circulation structure, the first circulation structure and the blower are in mechanical fit relation with each other, the heat exchange structure is used for forming heat exchange airflow in the waste liquid tank and the water production tank, and the opposite-impact heat exchange efficiency between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area is improved; the first circulation structure and the second circulation structure are used for directly compensating the heat difference between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area.
Description
Technical Field
The invention relates to a wastewater treatment technology, in particular to a high-salt organic wastewater treatment system and a high-salt organic wastewater treatment process based on an EVAIR technology.
Background
High-salt wastewater refers to wastewater containing organic matter and at least 3.5% (mass concentration) of Total Dissolved Solids (TDS). The waste water has wide sources, and a large amount of waste water can be discharged in various industrial production processes such as chemical industry, pharmacy, petroleum, papermaking, dairy product processing, food canning and the like, and the water contains a large amount of high-concentration organic pollutants accompanied by a large amount of calcium, sodium, chlorine, sulfate radical and the like.
In order to respond to new environmental protection requirements, a set of evaporation system is added to the solid waste of general enterprises to treat the waste water on the basis of the existing environmental protection equipment; most enterprises treat waste liquid in an evaporation mode, and part of enterprises also treat the waste liquid by adopting an EVAIR evaporation concentration technology.
The direct evaporation mode is to heat water to the boiling point under the atmosphere by means of heat energy, evaporate the water and leave the system in the form of vapor, the vapor phase part of the evaporation system mainly consists of vapor, and the system condenses the vapor obtained by evaporation to obtain the produced water. EVAIR relies on the volatility of water vapor in an atmosphere to evaporate water and obtain produced water. Because air can carry a considerable proportion of water vapor when the temperature is higher, the water vapor can enter the gas at a boiling point lower than that of the current atmosphere, when the temperature of the gas is reduced, the moisture carrying capacity of the gas is reduced, and the water vapor is converted into produced water.
However, the existing EVAIR evaporation concentration technology has the problem of low energy utilization rate, and the cold source and the heat source cannot be fully utilized, so that the energy consumption is high.
Disclosure of Invention
The invention aims to provide a high-salt organic wastewater treatment system and a high-salt organic wastewater treatment process based on an EVAIR technology, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a high-salt organic wastewater treatment system based on an EVAIR technology comprises an EVAIR water inlet unit, an EVAIR emergency softening unit, an EVAIR evaporation unit, a heat pump energy system, an EVAIR forced curing unit, an EVAIR cleaning unit, a precipitation unit and an EVAIR centrifugal dehydration unit; the EVAIR evaporation unit comprises an EVAIR evaporation device;
the EVAIR evaporation device comprises a skid-mounted base, wherein mounting frames are respectively arranged on two sides of the skid-mounted base, a detachable waste liquid tank and a detachable water production tank are respectively arranged on the mounting frames on two sides, a high-temperature pipe is arranged on one side of the upper part of the waste liquid tank in a penetrating way, and the high-temperature pipe is connected with a heat source in a heat pump energy system through a heat exchanger so as to pump hot gas into the upper part of the waste liquid tank;
the waste liquid tank is internally provided with a high-temperature area and a first low-temperature area from top to bottom, the middle area inside the waste liquid tank is connected with a blower, and the high-temperature area and the first low-temperature area are communicated through a first circulating structure;
a second low-temperature area and a middle-high-temperature area are formed in the water production tank from top to bottom, and the middle area in the water production tank is communicated with the top of the waste liquid tank through an air duct; the top of the water producing tank is provided with a low-temperature manifold in a penetrating way, the bottom of the water producing tank is provided with a water outlet pipe in a penetrating way, and the water outlet pipe is connected with a cold source in the heat pump energy system through a heat exchanger; the medium-high temperature area is communicated with the second low temperature area through a second circulating structure;
the internal heat exchange structures in the water production tank and the waste liquid tank are respectively provided with a first heat exchange structure, and the internal heat exchange structure in the waste liquid tank is a second heat exchange structure; the first heat exchange structure, the second circulation structure, the first circulation structure and the blower are in mechanical fit with each other.
High-salinity organic wastewater treatment system based on EVAIR technology as described above: one side of the mounting frame provided with the waste liquid tank is provided with a first circulating structure, and the first circulating structure comprises a first air pump arranged on the mounting frame, a first circulating pipe communicated with a high-temperature area at the upper part of the waste liquid tank and an air inlet end of the first air pump, and a second circulating pipe communicated with an air outlet end of the first air pump and a low-temperature area;
one side of the installation frame provided with the water producing tank is provided with a second circulation structure, the second circulation structure comprises a second air pump arranged on the installation frame, a third circulation pipe communicated with a second low-temperature area in the water producing tank and a second air pump air outlet end, and a fourth circulation pipe communicated with a second air pump air inlet end and a middle-high temperature area, and the pumping directions of the second air pump and the first air pump are opposite.
High-salinity organic wastewater treatment system based on EVAIR technology as described above: a motor is arranged on one side of the second air pump, the output end of the motor is connected with the impeller shaft of the second air pump, and the impeller shaft of the second air pump is connected with the impeller shaft of the first air pump through a transmission shaft;
the transmission shaft penetrates through the water production tank and is in sealing running fit with the water production tank, and simultaneously penetrates through one side, close to the water production tank, of the waste liquid tank and is connected with a second heat exchange structure in the waste liquid tank.
High-salinity organic wastewater treatment system based on EVAIR technology as described above: the inside of the blower is provided with a fan blade, the fan blade is rotatably arranged in the blower through a rotating shaft, and one side of the blower is provided with a net cover for the entry of ambient air flow; the rotating shaft passes through the other side of the blower and is connected with the transmission shaft through a transmission belt;
an air outlet is arranged at the upper part of the blower, and the air outlet is communicated with the middle area inside the waste liquid tank through an air supply pipe.
High-salinity organic wastewater treatment system based on EVAIR technology as described above: the first heat exchange structure and the second heat exchange structure in the internal heat exchange structure have the same structure;
the internal heat exchange structure comprises a ring frame, a heat exchange shaft rotatably arranged in the center of the ring frame and a fan arranged on the heat exchange shaft, wherein the heat exchange shaft is connected with the transmission shaft through a bevel gear set;
the bevel gear set comprises a large bevel gear arranged on the transmission shaft and a small bevel gear arranged on the heat exchange shaft, and the small bevel gear is meshed with the large bevel gear.
A high-salt organic wastewater treatment process based on an EVAIR technology comprises the following steps: the flow is as follows:
1) Pumping the waste liquid into an EVAIR water inlet unit and a to-be-fed subsequent unit on site;
2) When the hardness of the waste liquid is too high, the waste liquid is pumped into an EVAIR emergency softening unit for softening treatment, otherwise, the unit is exceeded; the unit discharges the sediment to the existing sediment precipitation unit of the first party to press the sediment when in operation;
3) The EVAIR evaporation unit receives the front incoming water for evaporation concentration, and the heat source and the cold source are provided by a heat pump energy system;
4) The EVAIR cleaning unit regularly cleans the heat exchange system in the EVAIR evaporation unit on line, ensures the stable and efficient operation of the system, and discharges a small amount of cleaning waste liquid to the collecting tank;
5) The high-concentration supersaturated concentrated solution of the EVAIR evaporation unit is discharged to an EVAIR forced curing unit for further curing;
6) The EVAIR centrifugal dehydration unit is used for dehydrating and producing salt;
7) The EVAIR product water collection box collects the qualified product water and discharges the qualified product water to the appointed position of the first party.
Compared with the prior art, the invention has the beneficial effects that: the first heat exchange structure, the second circulation structure, the first circulation structure and the blower are in mechanical fit relation with each other, the heat exchange structure is used for forming heat exchange airflow in the waste liquid tank and the water production tank, and the opposite-impact heat exchange efficiency between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area is improved; the first circulation structure and the second circulation structure are used for directly compensating the heat difference between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area, so that the utilization rate of the heat source and the cold source is improved.
Drawings
FIG. 1 is an isometric view of an EVAIR evaporation apparatus in a high salt content organic wastewater treatment system based on EVAIR technology;
FIG. 2 is a schematic view of the structure of an EVAIR evaporation device in a high salt content organic wastewater treatment system based on EVAIR technology;
FIG. 3 is a schematic view of an EVAIR evaporation device in an EVAIR technology-based high-salt organic wastewater treatment system in another direction;
FIG. 4 is a schematic view of the structure of the EVAIR evaporation device with the skid-mounted base, mounting frame, water producing tank and wastewater tank removed;
FIG. 5 is a schematic view of the structure of FIG. 4 from another perspective;
FIG. 6 is a schematic view of the structure of the ring frame and heat exchange shaft and the fan;
FIG. 7 is a flow chart of a high salt content organic wastewater treatment process based on EVAIR technology;
in the figure: 1-skid-mounted base; 2-mounting frames; 3-a waste liquid tank; 4-a water producing tank; 5-high temperature tube; 6-a blower; 7-an air supply pipe; 8-a first air pump; 9-a first circulation pipe; 10-a second circulation tube; 11-an airway; 12-a second air pump; 13-a third circulation pipe; 14-a fourth circulation pipe; 15-a water outlet pipe; a 16-motor; 17-a transmission shaft; 18-a transmission belt; 19-large bevel gears; 20-bevel pinion; 21-a ring frame; 22-fans; 23-low temperature manifold.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 7, as an embodiment of the present invention, the process for treating high-salt organic wastewater based on EVAIR technology comprises the following specific process flows:
1) Pumping the waste liquid into an EVAIR water inlet unit and a to-be-fed subsequent unit on site;
2) When the hardness of the waste liquid is too high, the waste liquid is pumped into an EVAIR emergency softening unit for softening treatment, otherwise, the unit is exceeded; the unit discharges the sediment to the existing sediment precipitation unit of the first party to press the sediment when in operation;
3) The EVAIR evaporation unit receives the front incoming water for evaporation concentration, and the heat source and the cold source are provided by a heat pump energy system;
4) The EVAIR cleaning unit regularly cleans the heat exchange system in the EVAIR evaporation unit on line, ensures the stable and efficient operation of the system, and discharges a small amount of cleaning waste liquid to the collecting tank;
5) The high-concentration supersaturated concentrated solution of the EVAIR evaporation unit is discharged to an EVAIR forced curing unit for further curing;
6) The EVAIR centrifugal dehydration unit is used for dehydrating and producing salt;
7) The EVAIR product water collection box collects the qualified product water and discharges the qualified product water to the appointed position of the first party.
Wherein, the water quality requirements of the original waste liquid are shown in the following table 1:
the water quality requirements of the effluent produced by the EVAIR evaporation unit are shown in table 2 as follows:
| sequence number | Monitoring items | Unit (B) | Numerical index | Remarks |
| 1 | pH | Dimensionless quantity | 6～9 | |
| 2 | COD cr | mg/L | ≦200 | |
| 3 | BOD5 | mg/L | ≦50 | |
| 4 | TDS | mg/L | ≦1000 | About 0.1% |
| 5 | SS | mg/L | ≦100 | |
| 6 | Ammonia nitrogen | mg/L | ≦30 |
The wastewater treatment difficulty in the invention is that the wastewater has complex components and contains more refractory substances which cannot be treated by biochemistry, and no ideal technology is available on the market at present to solve the problem.
In order to realize the standard treatment of high-concentration electroplating salt-containing and organic wastewater, an EVAIR technology is adopted to treat the high-concentration organic wastewater with high salt content more effectively. The technology is mainly characterized in that the water evaporation is realized by taking the difference of saturated vapor pressures of water molecules in air at different temperatures as mass transfer power instead of directly evaporating the water.
The saturated vapor pressure of water vapor at different temperatures varies, and increases with increasing temperature.
The water vapor content in air is very low at room temperature, but near the boiling point of water (80-90 ℃) the water vapor content in air can be nearly 50% -75%.
This evaporation mode is very different from the direct evaporation mode. The direct evaporation mode is to heat water to the boiling point under the atmosphere by means of heat energy, evaporate the water and leave the system in the form of vapor, the vapor phase part of the evaporation system mainly consists of vapor, and the system condenses the vapor obtained by evaporation to obtain the produced water. EVAIR relies on the volatility of water vapor in an atmosphere to evaporate water and obtain produced water. Because air can carry a considerable proportion of water vapor when the temperature is higher, the water vapor can enter the gas at a boiling point lower than that of the current atmosphere, when the temperature of the gas is reduced, the moisture carrying capacity of the gas is reduced, and the water vapor is converted into produced water.
The EVAIR technology has the great advantage that:
(1) Because the heat transfer surface is separated from the phase change interface, fouling at the filler phase change site does not affect the heat transfer efficiency of the system. Therefore, the system has extremely high tolerance on structural influence, and can greatly reduce the medicament cost and the solid waste treatment cost in the pretreatment stage.
(2) Because the operation temperature is lower, the phase-change interface has no heat transfer requirement, the phase-change interface of the separation equipment can be made of cheap materials such as plastics and the like, expensive alloy materials for manufacturing the reaction kettle in the traditional evaporation technology are not needed, and the equipment cost can be greatly reduced.
(3) Because the filler does not need to use metal, the corrosion resistance of the system can be improved by adopting a novel corrosion-resistant high-tech material, so that the equipment is not afraid of substances with strong corrosiveness and strong oxidability in the wastewater.
The system adopts air as an extraction medium of water vapor, the evaporation and condensation processes of the whole process are all carried out under normal pressure, and sealing materials and structural members with high specification are not needed as in the traditional evaporator using negative pressure or high pressure for evaporation, so that the instability of the system is greatly reduced.
The comparison of the performance parameters of the mainstream evaporation technique and EVAIR technique is shown in table 3 as follows:
the high-salt organic wastewater treatment system based on the EVAIR technology, which is applied to the process, comprises an EVAIR water inlet unit, an EVAIR emergency softening unit, an EVAIR evaporation unit, a heat pump energy system, an EVAIR forced curing unit, an EVAIR cleaning unit, a precipitation unit and an EVAIR centrifugal dehydration unit; wherein, the EVAIR evaporating unit includes an EVAIR evaporating apparatus, please refer to fig. 1-6, which is different from the EVAIR evaporating apparatus in use in the market; the method comprises the following steps:
the EVAIR evaporation device comprises a skid-mounted base 1, wherein mounting frames 2 are respectively arranged on two sides of the skid-mounted base 1, a detachable waste liquid tank 3 and a detachable water production tank 4 are respectively arranged on the mounting frames 2 on two sides, a high-temperature pipe 5 is arranged on one side of the upper part of the waste liquid tank 3 in a penetrating way, and the high-temperature pipe 5 is connected with a heat source in a heat pump energy system through a heat exchanger so as to pump hot gas into the upper part of the waste liquid tank 3;
the inside of the waste liquid tank 3 is provided with a high temperature area and a first low temperature area from top to bottom, the middle area inside the waste liquid tank 3 is connected with a blower 6, and the high temperature area and the first low temperature area are communicated through a first circulating structure;
a second low temperature area and a middle high temperature area are formed in the water producing tank 4 from top to bottom, and the middle area in the water producing tank 4 is communicated with the top of the waste liquid tank 3 through an air duct 11; the top of the water producing tank 4 is provided with a low-temperature manifold 23 in a penetrating way, the bottom of the water producing tank is provided with a water outlet pipe 15 in a penetrating way, and the water outlet pipe 15 is connected with a cold source in the heat pump energy system through a heat exchanger; the medium-high temperature area is communicated with the second low temperature area through a second circulation structure.
A heat source in the heat pump energy system pumps hot gas into the high-temperature pipe 5 through a heat exchanger, and the hot gas enters from the upper part of the waste liquid tank 3, so that a high-temperature area is formed at the upper part of the waste liquid tank 3; the hot gas continuously releases heat in the process of downward heat conduction in the waste liquid tank 3, so that a first low-temperature zone is formed at the lower part of the waste liquid tank 3; evaporating raw waste liquid in the waste liquid tank 3 in a first low-temperature zone to form water vapor; the blower 6 continuously blows air into the waste liquid tank 3 to enable the waste liquid tank 3 to form air flow, and water vapor in the first low temperature zone is carried to flow to the high temperature zone under the action of the air flow; because the atmosphere temperature of the high temperature region is high, the saturated vapor pressure of the vapor is continuously increased in the process of flowing from the first low temperature region to the high temperature region, namely, the content of the vapor is continuously increased in the process of flowing from the first low temperature region to the high temperature region, so that the carrying capacity of the vapor is improved.
The water vapor with high carrying capacity enters the water producing tank 4 along the air duct 11 under the action of air flow; part of heat in a high temperature region can be guided to the bottom of the waste liquid tank 3 through the first circulating structure, the original waste liquid at the bottom of the waste liquid tank 3 is heated, and the formation of steam from water in the original waste liquid is accelerated; the heat in the high temperature area is prevented from being conducted to the first low temperature area in time and then flows out of the waste liquid tank 3 together with the air flow through the air duct 11, so that the heat utilization rate is improved.
After entering the water producing tank 4 through the air duct 11, the air flow carrying the high-saturation water vapor flows upwards from the middle area of the water producing tank 4 and finally is discharged through the low-temperature manifold 23; since the cold air is continuously led into the water producing tank 4 from the heat exchanger through the water outlet pipe 15, after the water vapor flowing into the water producing tank 4 through the air duct 11 is cooled, the ambient atmosphere temperature is reduced, the saturation of the water vapor in the air is reduced, and finally the water vapor is changed into produced water; the second circulation structure is used for conveying cold air in the middle-high temperature area to the second low temperature area so as to form the second low temperature area at the upper part of the water producing tank 4, so that the temperature of the environment atmosphere is continuously reduced in the process that air flow discharged into the middle area of the water producing tank 4 by the air duct 11 flows to the low temperature manifold 23, the saturation of water vapor in the air flow is gradually reduced, and water is continuously produced.
The invention improves the existing EVAIR evaporation device in that the water producing tank 4 and the waste liquid tank 3 are provided with internal heat exchange structures, the internal heat exchange structure in the water producing tank 4 is a first heat exchange structure, and the internal heat exchange structure in the waste liquid tank 3 is a second heat exchange structure; the first heat exchange structure, the second circulation structure, the first circulation structure and the blower 6 are in mechanical fit relation with each other, the heat exchange structures are used for forming heat exchange airflow in the waste liquid tank 3 and the water production tank 4, and the opposite-impact heat exchange efficiency between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area is improved; the first circulation structure and the second circulation structure are used for directly compensating the heat difference between the high temperature area and the first low temperature area, the middle high temperature area and the second low temperature area, so that the utilization rate of the heat source and the cold source is improved.
Because the first heat exchange structure, the second circulation structure, the first circulation structure and the blower 6 are in mechanical fit relation with each other, after the device is started, heat exchange, circulation and blowing can be synchronously performed without separate control, and the rates of the heat exchange, circulation and blowing are mutually corresponding. At present, the EVAIR evaporation device basically does not have a heat exchange structure, so that the utilization ratio of a heat source and a cold source provided by a heat pump energy system has an improvement space, on one hand, the energy can be saved, the utilization ratio of the energy can be improved, and on the other hand, the water production efficiency can be improved; and no mechanical coordination relation exists between the used circulation structure and the blower equipment, and the circulation structure and the blower equipment are driven and controlled by independent power sources; therefore, a matched operation rate relation cannot be established between the two.
In addition, the factory skid-mounted design is adopted, so that the field construction quantity is greatly reduced.
As a further proposal of the invention, a first circulation structure is arranged on one side of the installation frame 2 provided with the waste liquid tank 3, and the first circulation structure comprises a first air pump 8 arranged on the installation frame 2, a first circulation pipe 9 which is communicated with a high temperature area at the upper part of the waste liquid tank 3 and an air inlet end of the first air pump 8, and a second circulation pipe 10 which is communicated with an air outlet end of the first air pump 8 and a low temperature area.
The first air pump 8 is arranged to work, so that high-temperature gas and part of water vapor in a high-temperature region can be directly led into the bottom of the waste liquid tank 3 through the first circulating pipe 9 and the second circulating pipe 10, waste liquid at the bottom of the waste liquid tank 3 is heated and compensated, and water liquid evaporation in the waste liquid is accelerated; the heat energy utilization rate in the high temperature area is improved, and the heat in the high temperature area is prevented from being directly discharged from the waste liquid tank 3 through the air duct 11 under the action of the air flow generated by the air blower 6.
As a still further scheme of the invention, a second circulation structure is arranged on one side of the mounting frame 2 provided with the water producing tank 4, the second circulation structure comprises a second air pump 12 arranged on the mounting frame 2, a third circulation pipe 13 communicated with a second low-temperature area in the water producing tank 4 and an air outlet end of the second air pump 12, and a fourth circulation pipe 14 communicated with an air inlet end of the second air pump 13 and a middle-high temperature area, and the pumping directions of the second air pump 12 and the first air pump 8 are opposite.
Cold source in the heat pump energy system sends cold air into the water producing tank 4 from the bottom of the water producing tank 4 through the water outlet pipe 15, the cold air cools and cools partial vapor and hot air sent by the air duct 11 in the middle area of the water producing tank 4 to form a medium-high temperature area at the lower part of the water producing tank 4, so that cold air at the bottom of the water producing tank 4 can directly enter a second low temperature area without passing through the medium-high temperature area to compensate the atmosphere temperature in the second low temperature area; the second air pump 12 works to enable cold air at the bottom of the water producing tank 4 to be led into the upper part of the water producing tank 4 through the fourth circulating pipe 14 and the third circulating pipe 13 to form a second low-temperature area so as to further cool medium-high-temperature steam and air flow flowing in the medium-high-temperature area, thereby further reducing the atmosphere temperature of the air flow, further reducing the saturation of the steam and increasing the water production rate.
One side of the second air pump 12 is provided with a motor 16, the output end of the motor 16 is connected with an impeller shaft of the second air pump 12, and the impeller shaft of the second air pump 12 is connected with an impeller shaft of the first air pump 8 through a transmission shaft 17 so as to realize a double-pump linkage effect;
obviously, the transmission shaft 17 penetrates through the water producing tank 4 and is in sealing and rotating fit with the water producing tank, and the transmission shaft 17 simultaneously penetrates through one side, close to the water producing tank 4, of the waste liquid tank 3 to be connected with a second heat exchange structure in the waste liquid tank 3.
As a still further scheme of the invention, the blower 6 is internally provided with a fan blade, the fan blade is rotatably arranged in the blower 6 through a rotating shaft, and one side of the blower 6 is provided with a net cover for the entry of ambient air flow; the rotating shaft passes through the other side of the blower 6 and is connected with a transmission shaft 17 through a transmission belt 18;
an air outlet is arranged at the upper part of the blower 6, and the air outlet is communicated with the middle area inside the waste liquid tank 3 through an air supply pipe 7.
The rotation of the rotating shaft is driven by the rotation of the transmission shaft 7 and the transmission belt 18, so that the fan blades rotate finally, and the ambient air is continuously pumped into the middle area inside the waste liquid tank 3 through the air supply pipe 7 to form air flow.
As still further aspects of the present invention, the first heat exchange structure and the second heat exchange structure in the internal heat exchange structure have the same configuration;
the internal heat exchange structure comprises a ring frame 21, a heat exchange shaft rotatably arranged in the center of the ring frame 21 and a fan 22 arranged on the heat exchange shaft, wherein the heat exchange shaft is connected with a transmission shaft 17 through a bevel gear set;
the bevel gear set comprises a large bevel gear 19 arranged on the transmission shaft 17 and a small bevel gear 20 arranged on the heat exchange shaft, wherein the small bevel gear 20 is meshed with the large bevel gear 19.
Note that the ring frame 21 in the first heat exchange structure is provided in the water production tank 4, and the ring frame 21 in the second heat exchange structure is provided in the waste liquid tank 3.
The large bevel gear 19 is driven to rotate through the rotation of the transmission shaft 17, the large bevel gear 19 drives the small bevel gear 20, the heat exchange shaft and the fan 22 to rotate rapidly, and the rapid rotation of the fan 22 can enable heat in a high-temperature area and a first low-temperature area to exchange in opposite directions; and heat in the medium-high temperature area and the second low temperature area is exchanged in opposite impact.
The above-described embodiments are illustrative, not restrictive, and the technical solutions that can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention are included in the present invention.
Claims (3)
1. A high-salt organic wastewater treatment system based on an EVAIR technology comprises an EVAIR water inlet unit, an EVAIR emergency softening unit, an EVAIR evaporation unit, a heat pump energy system, an EVAIR forced curing unit, an EVAIR cleaning unit, a precipitation unit and an EVAIR centrifugal dehydration unit; the EVAIR evaporation unit comprises an EVAIR evaporation device and is characterized in that the EVAIR evaporation device comprises a skid-mounted base (1), two sides of the skid-mounted base (1) are respectively provided with a mounting frame (2), the mounting frames (2) on the two sides are respectively provided with a detachable waste liquid tank (3) and a water production tank (4), one side of the upper part of the waste liquid tank (3) is provided with a high-temperature pipe (5) in a penetrating way, and the high-temperature pipe (5) is connected with a heat source in a heat pump energy system through a heat exchanger so as to pump hot gas into the upper part of the waste liquid tank (3);
a high-temperature area and a first low-temperature area are formed in the waste liquid tank (3) from top to bottom, a blower (6) is connected to the middle area in the waste liquid tank (3), and the high-temperature area and the first low-temperature area are communicated through a first circulating structure;
a second low-temperature area and a middle-high-temperature area are formed in the water production tank (4) from top to bottom, and the middle area in the water production tank (4) is communicated with the top of the waste liquid tank (3) through an air duct (11); the top of the water producing tank (4) is provided with a low-temperature manifold (23) in a penetrating way, the bottom of the water producing tank is provided with a water outlet pipe (15) in a penetrating way, and the water outlet pipe (15) is connected with a cold source in the heat pump energy system through a heat exchanger; the medium-high temperature area is communicated with the second low temperature area through a second circulating structure;
one side of a mounting frame (2) provided with a waste liquid tank (3) is provided with a first circulation structure, and the first circulation structure comprises a first air pump (8) arranged on the mounting frame (2), a first circulation pipe (9) communicated with a high-temperature area at the upper part of the waste liquid tank (3) and an air inlet end of the first air pump (8), and a second circulation pipe (10) communicated with an air outlet end of the first air pump (8) and a low-temperature area;
one side of the mounting frame (2) provided with the water producing tank (4) is provided with a second circulation structure, the second circulation structure comprises a second air pump (12) arranged on the mounting frame (2), a third circulation pipe (13) communicated with a second low-temperature area in the water producing tank (4) and an air outlet end of the second air pump (12), and a fourth circulation pipe (14) communicated with an air inlet end of the second air pump (12) and a middle-high temperature area, and the pumping directions of the second air pump (12) and the first air pump (8) are opposite;
a motor (16) is arranged on one side of the second air pump (12), the output end of the motor (16) is connected with the impeller shaft of the second air pump (12), and the impeller shaft of the second air pump (12) is connected with the impeller shaft of the first air pump (8) through a transmission shaft (17);
the transmission shaft (17) penetrates through the water production tank (4) and is in sealing running fit with the water production tank, and the transmission shaft (17) simultaneously penetrates through one side, close to the water production tank (4), of the waste liquid tank (3) and is connected with a second heat exchange structure in the waste liquid tank (3);
the inside of the air blower (6) is provided with fan blades, the fan blades are rotatably arranged in the air blower (6) through a rotating shaft, and one side of the air blower (6) is provided with a net cover for the entry of ambient air flow; the rotating shaft passes through the other side of the blower (6) and is connected with a transmission shaft (17) through a transmission belt (18);
an air outlet is arranged at the upper part of the blower (6), and the air outlet is communicated with the middle area inside the waste liquid tank (3) through an air supply pipe (7);
the first heat exchange structure and the second heat exchange structure in the internal heat exchange structure have the same structure;
the internal heat exchange structure comprises a ring frame (21), a heat exchange shaft rotatably arranged in the center of the ring frame (21) and a fan (22) arranged on the heat exchange shaft, wherein the heat exchange shaft is connected with a transmission shaft (17) through a bevel gear set;
the bevel gear set comprises a large bevel gear (19) arranged on the transmission shaft (17) and a small bevel gear (20) arranged on the heat exchange shaft, and the small bevel gear (20) is meshed with the large bevel gear (19).
2. The high-salt-content organic wastewater treatment system based on the EVAIR technology according to claim 1, wherein the water producing tank (4) and the waste liquid tank (3) are respectively provided with an internal heat exchange structure, the internal heat exchange structure in the water producing tank (4) is a first heat exchange structure, and the internal heat exchange structure in the waste liquid tank (3) is a second heat exchange structure; the first heat exchange structure, the second circulation structure, the first circulation structure and the blower (6) are in mechanical fit relation with each other.
3. A process for treating high-salinity organic wastewater using an EVAIR technology-based high-salinity organic wastewater treatment system according to any one of claims 1-2, comprising the steps of:
1) Pumping the waste liquid into an EVAIR water inlet unit and a to-be-fed subsequent unit on site;
2) When the hardness of the waste liquid is too high, the waste liquid is pumped into an EVAIR emergency softening unit for softening treatment, otherwise, the unit is exceeded; the unit discharges the sediment to the existing sediment precipitation unit of the first party to press the sediment when in operation;
3) The EVAIR evaporation unit receives the front incoming water for evaporation concentration, and the heat source and the cold source are provided by a heat pump energy system;
4) The EVAIR cleaning unit regularly cleans the heat exchange system in the EVAIR evaporation unit on line, ensures the stable and efficient operation of the system, and discharges a small amount of cleaning waste liquid to the collecting tank;
5) The high-concentration supersaturated concentrated solution of the EVAIR evaporation unit is discharged to an EVAIR forced curing unit for further curing;
6) The EVAIR centrifugal dehydration unit is used for dehydrating and producing salt;
7) The EVAIR product water collection box collects the qualified product water and discharges the qualified product water to the appointed position of the first party.
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| CN202211032010.4A CN115231717B (en) | 2022-08-26 | 2022-08-26 | High-salt organic wastewater treatment system and technology based on EVAIR technology |
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