CN216997749U - Seawater desalination system based on multistage flash distillation-low temperature multiple-effect distillation of waste water - Google Patents
Seawater desalination system based on multistage flash distillation-low temperature multiple-effect distillation of waste water Download PDFInfo
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- CN216997749U CN216997749U CN202123253371.5U CN202123253371U CN216997749U CN 216997749 U CN216997749 U CN 216997749U CN 202123253371 U CN202123253371 U CN 202123253371U CN 216997749 U CN216997749 U CN 216997749U
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Abstract
The utility model discloses a seawater desalination system based on wastewater multistage flash evaporation-low-temperature multi-effect distillation. The seawater desalination system comprises a multi-stage wastewater flash tank, a multi-effect evaporator, a plurality of wastewater return pumps for conveying wastewater flashed by an upper-stage wastewater flash tank to a lower-stage wastewater flash tank and a wastewater drainage pump for discharging wastewater flashed by a last-stage wastewater flash tank, wherein the multi-stage wastewater flash tanks are connected in series through the wastewater return pumps, the first-stage wastewater flash tank is provided with a high-temperature wastewater inlet, a steam connecting pipe of the first-stage wastewater flash tank is connected with a shell of the first-effect evaporator, and steam connecting pipes of the second-stage wastewater flash tank to the last-stage wastewater flash tank are sequentially connected with a shell of the middle-effect evaporator. The seawater desalination system can fully utilize waste water waste heat resources for seawater desalination water production, realizes the recycling of heat in the waste water, and can be popularized and applied in the fields of coastal steel, chemical industry and the like.
Description
Technical Field
The utility model relates to a seawater desalination system based on wastewater multistage flash evaporation-low-temperature multi-effect distillation, and belongs to the technical field of seawater desalination.
Background
The seawater desalination is a technology for separating fresh water from seawater, and is mainly divided into a distillation method mainly based on heat energy consumption and a reverse osmosis method mainly based on electric energy consumption according to different energy forms in a desalination process.
The low-temperature multi-effect distillation (MED) seawater desalination technology is the second generation of thermal sea desalination technology recognized in the industry and is the development direction of the thermal sea desalination technology. Because it usually adopts high-quality steam turbine extraction steam as power steam, its operation cost is higher overall and engineering application is limited.
In the fields of steel, chemical industry and the like, the waste water with the temperature of more than 70 ℃ is abundant, the subsequent treatment of the waste water is not limited due to the overhigh temperature, and the cooling treatment is needed. High-temperature wastewater is cooled and cooled by a heat exchanger, so that the investment and power consumption of heat exchange equipment are increased. In addition, because waste water quality of water is poor, the suspended solid content is high, and the heat transfer passageway of heat exchanger blocks up, the pollution of heat transfer surface, the commonality problems such as corrosion failure of heat transfer inner part appear very easily, causes equipment operation to break off very easily, and system's device is compelled to shut down and is washd, spends a large amount of chemical agent, cost such as manual cleaning and handles these problems. Meanwhile, the heat of the waste water is also taken away by the cooling water at the cold side, so that the waste of the low-temperature waste heat of the waste water is caused, and the waste water is not fully excavated and reused.
In order to solve the above problems, the prior art discloses a wastewater flash evaporation cooling scheme, such as chinese patent publication No. CN112811494A and utility model No. CN 214422294U.
The technical scheme disclosed by the above has the following defects: the wastewater flash evaporation method adopts split independent multi-stage flash evaporation and is respectively matched with a plurality of sets of MED systems. On one hand, the multi-stage wastewater is subjected to flash evaporation and parallel connection, so that the system has large operation fluctuation and poor stability, and the reliability of the system is reduced; in addition, a plurality of sets of MED systems are matched, so that the investment cost of main equipment, matched water pumps, valves, pipelines and the like is increased, the occupied area is correspondingly increased, and the applicability of engineering application is not facilitated.
Disclosure of Invention
The technical problem solved by the utility model is as follows: the waste water waste heat utilization difficulty is high, and the operation cost of the low-temperature multi-effect distillation conventional process is high.
In order to solve the technical problem, the utility model provides a seawater desalination system based on wastewater multistage flash evaporation-low-temperature multiple-effect distillation, which comprises a multistage wastewater flash evaporation tank, a multiple-effect evaporator, a plurality of wastewater return pumps for conveying wastewater flashed by an upper-stage wastewater flash evaporation tank to a lower-stage wastewater flash evaporation tank and a wastewater drainage pump for discharging wastewater flashed by a last-stage wastewater flash evaporation tank, wherein the wastewater flash evaporation tanks are connected in series through the wastewater return pumps, the first-stage wastewater flash evaporation tank is provided with a high-temperature wastewater inlet, a steam connecting pipe of the first-stage wastewater flash evaporation tank is connected with a shell of the first-effect evaporator, and steam connecting pipes of the second-stage wastewater flash evaporation tank to the last-stage wastewater flash evaporation tank are sequentially connected with a shell of the middle-effect evaporator. In the connection mode, steam flashed by the wastewater flash tank directly enters a heat exchange tube bundle of the multi-effect evaporator.
Preferably, the system also comprises a material seawater lifting pump, a material seawater condenser, a cooling seawater lifting pump, a cooling seawater condenser, a finished product water pump, a concentrated brine pump and a one-effect condensate pump;
the water outlet of the material seawater lifting pump is connected with the water inlet of the material seawater condenser, and the outlet of the material seawater condenser is connected with the inlets of the seawater pipelines of the effect materials of the multi-effect evaporator;
the water outlet of the cooling seawater lifting pump is connected with the water inlet of a cooling seawater condenser, and the cooling seawater condenser is provided with a water outlet;
the water inlet of the finished product water pump is connected with the last effect finished product water outlet of the multi-effect evaporator, and the finished product water pump is provided with a water outlet;
the water inlet of the concentrated brine pump is connected with the last concentrated brine outlet of the multi-effect evaporator, and the concentrated brine pump is provided with a water outlet;
the first-effect condensate pump is connected with a first-effect condensate outlet of the multi-effect evaporator.
Preferably, an automatic online flushing and sewage discharging device is arranged in the multistage wastewater flash tank.
The steam of the high-temperature wastewater flashed in the first-stage wastewater flash tank is used as the heating steam of the first effect of the low-temperature multi-effect distillation seawater desalination evaporator, the temperature of the wastewater flashed in the last stage can be matched according to the temperature requirement of the subsequent wastewater treatment process, the temperature can be reduced to below 35 ℃, and the requirement of the conventional membrane concentration treatment process is met. The utility model fully utilizes the pressure gradient distribution characteristic of the low-temperature multi-effect distillation evaporator to form a multi-stage wastewater flash evaporation waste heat utilization low-temperature multi-effect distillation seawater desalination system.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, two processes of wastewater multistage flash evaporation and low-temperature multi-effect distillation are organically combined to form a novel economic and efficient coupling process system, on one hand, the technical difficulty of conventional wastewater waste heat recovery is overcome, low-pressure steam with the pressure ranging from 20 to 30kPa is flashed from high-temperature wastewater through a matched flash evaporation tank, heat is transferred to circulating water at the cold side through a steam-water heat exchanger, but impurities in the wastewater stay in the cooled wastewater, the steam-water heat exchanger cannot be affected, the wastewater heat is extracted by adopting a non-contact flash evaporation new method, and the common problems of pollution, blockage, crystallization, corrosion and the like of the conventional wastewater heat exchanger are avoided;
2. according to the utility model, multi-stage wastewater flash evaporation is integrated into a low-temperature multi-effect distillation (MED) system, so that the MED system is driven to operate to produce water efficiently by waste heat of the wastewater, and the low volatility, high stability and reliability of the linkage operation of the multi-stage wastewater flash evaporation and the MED system are ensured through the integrated innovative design of the multi-stage wastewater flash evaporation and the MED process, and meanwhile, the equipment investment cost is reduced and the floor area of planar arrangement is reduced;
3. the seawater desalination system based on the multistage flash evaporation and low-temperature multi-effect distillation of the wastewater can fully utilize the waste heat resources of the wastewater for seawater desalination water production, realizes the recycling of heat in the wastewater, can be popularized and applied in the fields of coastal steel, chemical industry and the like, and has remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic structural diagram of a seawater desalination system based on wastewater flash evaporation-low temperature multi-effect distillation according to the present invention;
reference numerals: F1. a first stage wastewater flash tank; p1, a first-stage wastewater return pump; F2. a second-stage wastewater flash tank; p2, a second-stage wastewater return pump; F3. a third-stage wastewater flash tank; p3, a wastewater drainage pump; E1. a first effect evaporator; E2. a second effect evaporator; E3. a third effect evaporator; E4. a fourth effect evaporator; E5. a fifth effect evaporator; em. m effect evaporator; en. n-th effect evaporator; C1. a material seawater condenser; C2. cooling the seawater condenser; p4, finished product water pump; p5. concentrated brine pump; p6, a material seawater lift pump; p7, cooling the seawater lift pump; and P8. a single-effect condensate pump.
Detailed Description
In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
The embodiment provides a seawater desalination system based on waste water flash evaporation-low temperature multiple-effect distillation, which comprises a multi-stage waste water flash tank, a multiple-effect evaporator, a plurality of waste water return pumps for conveying waste water after the flash evaporation of an upper-stage waste water flash tank to a lower-stage waste water flash tank, a waste water discharge pump for discharging waste water after the flash evaporation of a last-stage waste water flash tank, a material seawater lifting pump, a material seawater condenser, a cooling seawater lifting pump, a cooling seawater condenser, a finished product water pump, a concentrated brine pump and an effect condensate pump, wherein the multi-stage waste water flash tanks are connected in series through the waste water return pumps.
The first-stage wastewater flash tank is provided with a high-temperature wastewater inlet, a steam connecting pipe of the first-stage wastewater flash tank is connected with a shell of the first-effect evaporator, and steam connecting pipes of the second-stage wastewater flash tank to the last-stage wastewater flash tank are sequentially connected with a shell of the middle-effect evaporator. In the connection mode, steam flashed off from the wastewater flash tank directly enters a heat exchange tube bundle of the multi-effect evaporator.
The water outlet of the material seawater lifting pump is connected with the water inlet of the material seawater condenser, and the outlet of the material seawater condenser is connected with the inlets of the seawater pipelines of the effect materials of the multi-effect evaporator; the water outlet of the cooling seawater lifting pump is connected with the water inlet of a cooling seawater condenser, and the cooling seawater condenser is provided with a water outlet; the water inlet of the finished product water pump is connected with the last effect finished product water outlet of the multi-effect evaporator, and the finished product water pump is provided with a water outlet; the water inlet of the concentrated brine pump is connected with the last concentrated brine outlet of the multi-effect evaporator, and the concentrated brine pump is provided with a water outlet; the first-effect condensate pump is connected with a first-effect condensate outlet of the multi-effect evaporator. And an automatic online flushing and sewage discharging device is arranged in the multistage wastewater flash tank.
By way of example, the seawater desalination system based on wastewater flash evaporation-low-temperature multi-effect distillation of the present embodiment combines a three-stage wastewater flash evaporation tank and an n-effect low-temperature multi-effect evaporator, as shown in fig. 1, including a first-stage wastewater flash evaporation tank F1, a first-stage wastewater return pump P1, a second-stage wastewater flash evaporation tank F2, a second-stage wastewater return pump P2, a third-stage wastewater flash evaporation tank F3, a wastewater discharge pump P3, a first-effect evaporator E1, a second-effect evaporator E2, a third-effect evaporator E3, a fourth-effect evaporator E4, a fifth-effect evaporator E5, an m-effect evaporator Em, an n-effect evaporator En, a material seawater condenser C1, a cooling seawater condenser C2, a product water pump P4, a concentrated brine pump P5, a material seawater lifting pump P6, a cooling seawater lifting pump P7, and a first-effect water pump condensation P8.
The high-temperature wastewater inflow is connected with a water inlet of a first-stage wastewater flash tank F1, a steam connecting pipe of the first-stage wastewater flash tank F1 is connected with a shell of a first-effect evaporator E1, and the wastewater after the flash evaporation at the bottom of the first-stage wastewater flash tank F1 is conveyed to a second-stage wastewater flash tank F2 through a first-stage wastewater backwater pump P1 to form a first-stage wastewater flash system.
And a steam connecting pipe of the second-stage wastewater flash tank F2 is connected with a shell of a fourth-effect evaporator E4, and the wastewater flashed at the bottom of the second-stage wastewater flash tank F2 is conveyed to a third-stage wastewater flash tank F3 through a second-stage wastewater return water pump P2 to form a second-stage wastewater flash system.
And a steam connecting pipe of the third-stage wastewater flash tank F3 is connected with the casing of the mth-effect evaporator Em, and wastewater after flash evaporation at the bottom of the mth-stage wastewater flash tank Fm is discharged through a wastewater discharge pump P3 to form a third-stage wastewater flash system.
A steam outlet of the first-stage wastewater flash tank F1 is connected with a heat exchange tube bundle tube pass inlet of a first-effect evaporator E1; a material seawater water supply pipeline boosted by a material seawater lifting pump P6 is connected with an inlet of a material seawater condenser C1, an outlet of the material seawater condenser C1 is connected with inlets of material seawater pipelines of the evaporator (E1 to En), a cooling seawater water supply pipeline boosted by a cooling seawater lifting pump P7 is connected with an inlet of a cooling seawater condenser C2, and an outlet of the cooling seawater condenser C2 is connected with a cooling seawater discharge pipeline; an inlet of a finished water pump P4 is connected with a finished water side of the last-effect low-temperature evaporator En, and an outlet of the finished water pump P4 is connected with an external water supply pipeline; an inlet of the concentrated brine pump P5 is connected with a concentrated brine side of the last-effect low-temperature evaporator En, and an outlet of the concentrated brine pump P5 is connected with an external water discharge pipeline; forming a low-temperature multi-effect seawater desalination system.
Take 800 ten thousand tons/day blast furnace slag flushing water of steel and iron works in a place in Hebei as an example. Through calculation, the blast furnace slag flushing water heat source of the steel mill has the capability of matching with a 2.5 ten thousand tons/day 6-effect low-temperature multi-effect distillation seawater desalination system. The average annual water power consumption per ton is about 2.0kWh/m3Because the cost of waste water waste heat recovery heat is ignored, the operation cost is about 2 yuan/ton, and the TDS (Total dissolved solids) of produced water is less than 5mg/L, the seawater desalination system based on waste water flash evaporation-low temperature multi-effect distillation not only has good economic and comprehensive benefits, but also can be widely applied to the industries of waste water waste heat energy conservation and emission reduction, can be further popularized and applied in the industries of steel, chemical industry and the like, and can generate good economic value and remarkable social benefit.
While the utility model has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.
Claims (3)
1. The utility model provides a sea water desalination system based on multistage flash distillation of waste water-low temperature multiple-effect distillation, a serial communication port, including multistage waste water flash tank, multiple effect evaporator, a plurality of waste water return pump that is used for carrying the waste water after last order waste water flash tank flash evaporation to next stage waste water flash tank and be used for the waste water discharge pump after last order waste water flash tank flash evaporation, multistage waste water flash tank between establish ties through waste water return pump, wherein, first order waste water flash tank is equipped with high temperature waste water inlet, the steam takeover of first order waste water flash tank is connected with the casing of first effect evaporator, the steam takeover of second level to last order waste water flash tank is connected with the casing of middle effect evaporator in proper order.
2. The seawater desalination system based on wastewater multi-stage flash evaporation-low temperature multi-effect distillation as claimed in claim 1, further comprising a material seawater lift pump, a material seawater condenser, a cooling seawater lift pump, a cooling seawater condenser, a finished product water pump, a concentrated brine pump and a one-effect condensate pump;
the water outlet of the material seawater lifting pump is connected with the water inlet of the material seawater condenser, and the outlet of the material seawater condenser is connected with the inlets of the seawater pipelines of the effect materials of the multi-effect evaporator;
the water outlet of the cooling seawater lifting pump is connected with the water inlet of a cooling seawater condenser, and the cooling seawater condenser is provided with a water outlet;
the water inlet of the finished product water pump is connected with the last effect finished product water outlet of the multi-effect evaporator, and the finished product water pump is provided with a water outlet;
the water inlet of the concentrated brine pump is connected with the last concentrated brine outlet of the multi-effect evaporator, and the concentrated brine pump is provided with a water outlet;
the first-effect condensate pump is connected with a first-effect condensate outlet of the multi-effect evaporator.
3. The seawater desalination system based on multistage flash evaporation and low-temperature multi-effect distillation of wastewater as claimed in claim 1 or 2, wherein an automatic online flushing blowdown device is arranged in the multistage wastewater flash tank.
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| CN202123253371.5U CN216997749U (en) | 2021-12-22 | 2021-12-22 | Seawater desalination system based on multistage flash distillation-low temperature multiple-effect distillation of waste water |
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| CN202123253371.5U CN216997749U (en) | 2021-12-22 | 2021-12-22 | Seawater desalination system based on multistage flash distillation-low temperature multiple-effect distillation of waste water |
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