WO2022037001A1 - Système de traitement des eaux usées - Google Patents

Système de traitement des eaux usées Download PDF

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Publication number
WO2022037001A1
WO2022037001A1 PCT/CN2021/070768 CN2021070768W WO2022037001A1 WO 2022037001 A1 WO2022037001 A1 WO 2022037001A1 CN 2021070768 W CN2021070768 W CN 2021070768W WO 2022037001 A1 WO2022037001 A1 WO 2022037001A1
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WO
WIPO (PCT)
Prior art keywords
evaporation
forced
sewage
temperature steam
falling film
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PCT/CN2021/070768
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English (en)
Chinese (zh)
Inventor
叶伟炳
李琴
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广东闻扬环境科技有限公司
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Publication of WO2022037001A1 publication Critical patent/WO2022037001A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
    • 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
    • C02F1/043—Details
    • 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
    • C02F1/08—Thin film evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/007—Modular design
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • 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
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • 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
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

Definitions

  • the present application relates to the technical field of sewage treatment, in particular to a sewage treatment system.
  • a sewage treatment system is provided.
  • a sewage treatment system comprising:
  • Preheating system for preheating sewage Preheating system for preheating sewage
  • a high temperature steam generating system for generating high temperature steam for generating high temperature steam
  • an evaporation system connected with the preheating system and the high-temperature steam generation system; the evaporation system includes a plurality of evaporation modules, any one of which can be isolated, and under the heating of the high-temperature steam, the remaining evaporation modules
  • the preheated sewage can be evaporated and concentrated in stages to obtain concentrated liquid and condensed water.
  • any one of the multiple evaporation modules can be isolated to facilitate cleaning or maintenance.
  • the evaporation module is isolated, the normal operation of the other evaporation modules will not be affected, thereby realizing the continuous, stable and efficient operation of the sewage treatment system.
  • the other evaporation modules can cooperate with each other to perform step-by-step evaporation and concentration of sewage, so as to achieve a better sewage treatment effect.
  • any one of the evaporation modules is connected to the evaporation module of the previous stage, the evaporation module of the next stage, and the evaporation module of the next stage, and is located in the first two stages.
  • Each evaporation module is respectively connected with the preheating system.
  • the plurality of evaporation modules include a plurality of falling film evaporation modules and a plurality of forced evaporation modules, the plurality of falling film evaporation modules are connected to the preheating system for preheating the preheating After the sewage is subjected to falling film evaporation treatment to obtain concentrated liquid, the plurality of forced evaporation modules are used for forced evaporation treatment of the concentrated liquid to obtain concentrated liquid; the number of the falling film evaporation modules is greater than or equal to the forced liquid. Number of evaporation modules.
  • the falling film evaporation module includes a falling film separation chamber, a falling film circulation pump and a falling film heater, the falling film heater is used to make the high temperature steam and the sewage flow in the falling film Heat exchange occurs in the heater, the falling film separation chamber is used for evaporative separation of the sewage heated in the falling film heater, and the falling film circulation pump is used for the waste water led out from the falling film separation chamber.
  • the sewage is re-introduced into the falling film heater to realize the circulating evaporation of sewage in the falling film evaporation module.
  • the falling film heater is used for condensing the high temperature steam to obtain condensed water
  • the falling film separation chamber is used for evaporating the sewage to obtain steam
  • the high-temperature steam generated by the high-temperature steam generation system is passed into the falling-film evaporation module of the subsequent stage, and the condensed water and steam generated by the falling-film evaporation module of the subsequent stage are passed into the falling-film evaporation module of the previous stage. in the falling film heater of the film evaporation module.
  • the forced evaporation module includes a forced separation chamber, a forced circulation pump and a forced heater, and the forced circulation pump is used to introduce the concentrate entering the forced separation chamber into the forced heater, so
  • the forced heater is used to exchange heat between the high temperature steam and the concentrated liquid in the forced heater
  • the forced separation chamber is used to evaporate and separate the heated concentrated liquid
  • the forced circulation pump is also used to separate the concentrated liquid.
  • the dope is introduced into the forced heater again, so as to realize the circulating evaporation of the dope in the forced evaporation module.
  • the forced separation chamber is used for evaporating the concentrated liquid to obtain steam; along the direction of step-by-step concentration of sewage, the steam generated by the forced evaporation module of the subsequent stage is passed into all the previous stages. in the forced heater of the forced evaporation module.
  • the sewage treatment system further includes a distilled water tank for collecting condensed water, and the condensed water in the distilled water tank can be introduced into the preheating system to preheat the sewage.
  • the preheating system includes a plurality of heat exchangers arranged in parallel.
  • a distilled water pump is provided between the distilled water tank and the preheating system, for pumping the condensate in the distilled water tank to the preheating system.
  • the high-temperature steam generating system includes: a high-temperature steam generator for generating high-temperature steam; and a steam injector connected to the high-temperature steam generator, and the steam injector is used for generating the high-temperature steam Steam jets are introduced into the evaporation system to bring the sewage treatment system into thermal vapor recompression (TVR) mode of operation.
  • TVR thermal vapor recompression
  • the high-temperature steam generation system includes: a high-temperature steam generator for generating high-temperature steam; and a compressor for compressing and warming up the steam generated by the evaporation of sewage in the evaporation system To form high temperature steam, the high temperature steam is introduced into the evaporation system, so that the sewage treatment system is in a mechanical vapor recompression (MVR) working mode.
  • MVR mechanical vapor recompression
  • the sewage treatment system further includes a pressure control system
  • the pressure control system includes a vacuum pump and a plurality of condensers
  • the plurality of condensers are connected in series to the communication passage between the vacuum pump and the evaporation system
  • the high-temperature steam introduced into the condenser can exchange heat with the cooling water introduced into the condenser to cause condensation
  • a plurality of the condensers are used for step-by-step cooling and condensation of the high-temperature steam.
  • FIG. 1 is a schematic structural diagram of a sewage treatment system according to an embodiment.
  • FIG. 2 is a schematic diagram of the connection of the sewage treatment system in the thermal vapor recompression (TVR) mode after isolating the No. 3 evaporation module in FIG. 1 .
  • TVR thermal vapor recompression
  • FIG. 3 is a schematic diagram of the connection of the sewage treatment system in the mechanical vapor recompression (MVR) mode after isolating the No. 3 evaporation module in FIG. 1 .
  • MVR mechanical vapor recompression
  • Fig. 4 is a schematic diagram of the connection of the sewage treatment system in TVR mode after isolating the No. 4 evaporation module in Fig. 1 .
  • FIG. 5 is a schematic diagram of the connection of the sewage treatment system in the MVR mode after isolating the No. 4 evaporation module in FIG. 1 .
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with “first”, “second” may expressly or implicitly include at least one of that feature.
  • plurality means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • installed may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • a first feature "on” or “under” a second feature may be in direct contact with the first and second features, or the first and second features indirectly through an intermediary touch.
  • the first feature being “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • an embodiment of the present application provides a sewage treatment system for concentrating sewage.
  • the sewage may be sewage containing selenium.
  • the sewage treatment system includes a preheating system 100 , a high temperature steam generating system 200 and an evaporation system 300 .
  • the preheating system 100 is used for preheating the sewage to increase the temperature of the sewage.
  • the high temperature steam generating system 200 is used to generate high temperature steam. Both the preheating system 100 and the high temperature steam generating system 200 are connected to the evaporation system 300 .
  • the preheating system 100 introduces the preheated sewage into the evaporation system 300
  • the high temperature steam generation system 200 introduces the high temperature steam into the evaporation system 300
  • the high temperature steam can heat the preheated sewage
  • the heated sewage can be evaporated in the evaporation system 300 Concentrated to form a concentrated liquid
  • the steam obtained by the evaporation of high-temperature steam and sewage can form condensed water.
  • the evaporation system 300 includes a plurality of evaporation modules 310 . Any one of the plurality of evaporation modules 310 can be isolated for cleaning or servicing. When the evaporation module 310 is isolated, the normal operation of the remaining evaporation modules 310 will not be affected, thereby realizing the continuous, stable and efficient operation of the sewage treatment system. It should be pointed out that, except for the isolated evaporation module 310, the other evaporation modules 310 can cooperate with each other to carry out step-by-step evaporation and concentration of sewage, so as to achieve a better sewage treatment effect.
  • any evaporation module 310 is connected to the previous-stage evaporation module 310, the next-stage evaporation module 310, and the next-stage evaporation module 310, and is located in the first two evaporation modules 310 are respectively connected to the preheating system 100 .
  • a plurality of evaporation modules 310 are connected in sequence along the direction of the step-by-step concentration of sewage, and two evaporation modules 310 adjacent to any evaporation module 310 are also connected. In this way, when any evaporation module 310 is isolated, by connecting the two adjacent evaporation modules 310, the concentration of sewage between the plurality of evaporation modules 310 can be realized step by step.
  • both the No. 1 evaporation module 310 and the No. 2 evaporation module 310 need to be connected to the preheating system 100, so as to isolate any one of the two , the sewage in the preheating system 100 can be introduced into the evaporation system 300 .
  • the previous evaporation module is the No. 1 evaporation module
  • the subsequent evaporation module is the No. 3 evaporation module
  • the subsequent evaporation module is the No. 4 evaporation module. Therefore, the No. 2 evaporation module
  • the evaporation modules are connected to evaporation modules No.
  • the No. 1 evaporation module 310 is isolated, the remaining four evaporation modules 310 can be connected in sequence, so that the sewage from the pre-heating system 100 passes through the No. 2, No. 3, No. 4, and No. 5 evaporation modules 310 in turn. grade concentration.
  • the connection between the No. 2 and No. 4 evaporation modules 310 can be used, so that the sewage flows from the pre-heating system 100 through No. 1, No. 2 and No. 4 in sequence. and No. 5 evaporation module 310 to complete the step-by-step concentration.
  • the plurality of evaporation modules 310 include a plurality of falling-film evaporation modules and a plurality of forced evaporation modules, and the plurality of falling-film evaporation modules are used for performing falling-film evaporation on the preheated sewage to obtain a concentrated solution, and the A forced evaporation module is used for forced evaporation of concentrated liquid to obtain concentrated liquid. It can be understood that with the gradual concentration of sewage, the concentration of sewage increases gradually. Only through multiple falling film evaporation modules can not effectively treat sewage.
  • the number of falling film evaporation modules is greater than or equal to the number of forced evaporation modules, and through the cooperation of multiple falling film evaporation modules and multiple forced evaporation modules, the effective treatment of sewage can be achieved, and the evaporation system 300 can be effectively treated. Costs are at a low level.
  • the two evaporation modules 310 connected to the preheating system 100 are both falling film evaporation modules, so that the preheating system 100 can supply sewage to the evaporation system 300 through one of the two evaporation modules 310 .
  • the No. 1, No. 2, and No. 3 evaporation modules 310 are all falling film evaporation modules, and the No. 4 and No. 5 evaporation modules 310 are forced evaporation modules. , isolating any one of the five evaporation modules 310, it is still possible to achieve a step-by-step and effective treatment of sewage.
  • the falling film evaporation module includes a falling film separation chamber, a falling film circulation pump, and a falling film heater.
  • High-temperature steam and sewage can enter the falling film heater and exchange heat in the falling film heater.
  • the sewage heated in the falling film heater can be evaporated and separated after being introduced into the falling film separation chamber, and the falling film circulating pump can The sewage discharged from the membrane separation chamber is re-introduced into the falling film heater to realize the circulating evaporation of the sewage in the falling film evaporation module.
  • the sewage enters the upper part of the falling film heater, and under the action of gravity, flows down along the inner wall of the pipe in the falling film heater to form a thin film, so as to fully exchange heat with the high-temperature steam around the pipe, so as to realize the sewage treatment. heating.
  • the pressure in the pipeline is controlled so that the pressure in the pipeline is lower than the saturated steam pressure at the corresponding temperature of the sewage, so that the sewage will not boil and evaporate in the pipeline.
  • the sewage flashes and concentrates due to the sudden drop in pressure.
  • the concentrated sewage is re-introduced into the falling film heater under the action of the falling film circulating pump, so as to realize the circulating evaporation in the falling film evaporation module, thereby increasing the concentration of the sewage.
  • the sewage is further introduced into another falling film evaporation module, and the sewage can be further concentrated by introducing high-temperature steam of different temperatures and controlling the pressure in the pipeline. In this way, after the step-by-step concentration of a plurality of falling film evaporation modules, the preheated sewage forms a concentrated solution and is passed into the forced evaporation module for forced evaporation treatment.
  • the sewage in the falling film evaporation module reaches the target concentration, the sewage is introduced into the falling film separation chamber or falling film heater of the adjacent falling film evaporation module under the action of the falling film circulating pump, so as to realize the adjacent Connection of two falling film evaporation modules.
  • the sewage exported from the falling film evaporation module of the previous stage can be introduced into the falling film separation chamber or falling film heater of the falling film evaporation module of the subsequent stage, so as to realize the isolation reduction. Connection of two falling film evaporation modules on both sides of the film evaporation module. As shown in FIG.
  • the No. 1 falling-film circulating pump is connected to the No. 2 falling-film separation chamber, so that the concentrated sewage from the No. 1 falling-film evaporation module is introduced into the No. 2 falling-film evaporation module; the No. 1 falling-film circulating pump is connected to the No. 3 falling film heater. , so that when the No. 2 falling-film evaporation module is isolated, the sewage concentrated by the No. 1 falling-film evaporation module can be introduced into the No. 3 falling-film evaporation module.
  • the forced evaporation module includes a forced separation chamber, a forced circulation pump, and a forced heater.
  • the concentrated liquid entering the forced separation chamber is introduced into the forced heater under the action of the forced circulation pump, and the high-temperature steam and the concentrated liquid can exchange heat in the forced heater, and the heated concentrated liquid can be evaporated and separated after being introduced into the forced separation chamber, while the The forced circulation pump re-introduces the concentrated liquid to the forced heater to realize the circulating evaporation of the concentrated liquid in the forced evaporation module.
  • the dope after the dope enters the pipeline in the forced heater, it can conduct sufficient heat exchange with the high-temperature steam at the periphery of the pipeline to achieve temperature rise.
  • the pressure in the pipeline Before the heated dope is introduced into the forced separation chamber, the pressure in the pipeline is controlled so that the pressure in the pipeline is lower than the saturated vapor pressure at the corresponding temperature of the dope, so that the dope will not boil and evaporate in the pipeline.
  • the dope is introduced into the forced separation chamber, since the pressure in the forced separation chamber is low, the dope will flash and concentrate due to the sudden drop in pressure.
  • the concentrated dope is re-introduced into the forced heater under the action of the forced circulation pump, so as to realize the circulating evaporation in the forced evaporation module, thereby increasing the concentration of the dope.
  • the concentrated solution formed by the concentrated solution reaching the target concentration is discharged through the forced circulation pump.
  • the concentrated liquid formed by multiple falling film evaporation modules can be introduced into the forced separation chamber; and when multiple forced evaporation modules are required to concentrate the concentrated liquid, the concentrated liquid exported by the previous forced evaporation module can be introduced into the latter one.
  • the forced separation chamber or forced heater in the forced evaporation module of the stage is used to realize the connection between two adjacent forced evaporation modules.
  • the concentrated liquid derived from the forced evaporation module of the previous stage can be introduced into the forced separation chamber or forced heater of the forced evaporation module of the subsequent stage, so as to realize the two functions of the forced falling film evaporation module. Connection of the two forced evaporation modules on the side. As shown in FIG.
  • both the falling film circulating pump and the forced circulating pump use a fully automatic self-control variable frequency PLC to control the circulating pump, which adjusts itself according to the flow rate of the sewage on site to provide an efficient driving force, thereby improving the separation between the falling film separation chamber and the forced separation chamber. Evaporation capacity, thereby reducing system energy consumption.
  • the high temperature steam is condensed in the falling film heater to obtain condensed water
  • the sewage is evaporated in the falling film separation chamber to obtain steam.
  • the high-temperature steam generated by the high-temperature steam generation system 200 is passed into the falling film evaporation module of the latter level, and the condensed water and steam generated by the falling film evaporation module of the latter level are passed into the descending film evaporation module of the former level. in the falling film heater of the film evaporation module.
  • the The first-level falling-film evaporation module uses the condensed water and steam generated by the latter-level falling-film evaporation module to heat the sewage, thereby improving the utilization rate of energy and reducing energy consumption under the condition that the sewage is heated and concentrated step by step. .
  • the evaporation system 300 has five evaporation modules 310, and the No. 1, No. 2, and No. 3 evaporation modules 310 are all falling film evaporation modules, and none of the three are isolated: high temperature steam
  • the high-temperature steam with the highest temperature generated by the generation system 200 first enters the No. 3 falling film heater, and the condensed water obtained by the condensation of the high-temperature steam in the No. 3 falling film heater is introduced into the No. 2 falling film heating from the bottom of the No. 3 falling film heater.
  • the steam obtained by the evaporation of sewage in the No. 3 falling film separation chamber can also be introduced above the No. 2 falling film heater.
  • the condensed water and steam of the No. 3 falling film evaporation module enter the No. 2 falling film evaporation module, and the sewage is heated at a temperature lower than that of the high-temperature steam in the No. 3 falling film evaporation module.
  • the sewage treatment system further includes a distilled water tank for collecting condensed water.
  • the condensed water generated by the falling film heater is introduced into the distilled water tank for collection.
  • FIG. 4 and FIG. 5 when the evaporation system 300 has five evaporation modules 310, and the No. 1, No. 2, and No. 3 evaporation modules 310 are all falling film evaporation modules, and none of the three are isolated: No. 2
  • the condensed water condensed in the falling film heater is introduced into the falling film heater No. 1 from the lower part of the falling film heater No.
  • the steam obtained by the evaporation of the sewage in the falling film separation chamber of the No. 2 can also be introduced above the falling film heater No. 1.
  • the condensed water and steam of the No. 2 falling film evaporation module enter the No. 1 falling film heater to heat the sewage, and the condensed water formed after further condensation flows into the distilled water tank for collection.
  • the dope is evaporated in the forced separation chamber to obtain steam.
  • the steam generated by the forced evaporation module of the latter stage is passed into the forced heater of the forced evaporation module of the previous stage.
  • the high temperature steam is passed into the forced evaporation module at the latter stage, so that the The forced evaporation module of the first level uses the steam generated by the forced evaporation module of the subsequent level to heat the sewage, thereby improving the utilization rate of energy and reducing the consumption of energy when the concentrated liquid is heated and concentrated step by step.
  • FIG. 2 and FIG. 3 when the evaporation system 300 has five evaporation modules 310, and the No. 4 and No. 5 evaporation modules 310 are both forced evaporation modules, and both are not isolated: No. 5 forced separation room evaporation
  • the obtained steam has a higher temperature and can be introduced into the No. 4 forced heating chamber to heat the dope at a temperature lower than that of the high-temperature steam in the No. 5 forced heating chamber.
  • the condensed water produced by the forced heater is introduced into a distilled water tank for collection.
  • a distilled water tank for collection.
  • the condensed water obtained by condensation in the heater directly flows into the distilled water tank to be collected.
  • the condensed water in the distilled water tank can be introduced into the preheating system 100 to preheat the sewage. Since the condensed water in the distilled water tank still has a relatively high temperature, the preheating of the sewage in the preheating system 100 can improve the utilization rate of energy.
  • the preheating system 100 includes a plurality of heat exchangers, and the plurality of heat exchangers are arranged in parallel. Any one of the heat exchangers can be isolated for cleaning and maintenance without affecting the preheating of the sewage by the other heat exchangers. heating.
  • the heat exchanger is a plate heat exchanger. The number of heat exchangers is specifically set to three. After the heat exchanger preheats the sewage, the lower temperature condensate can be discharged. Further, a distilled water pump is provided between the distilled water tank and the preheating system 100 to pump the condensate in the distilled water tank to the preheating system 100 .
  • the high temperature steam generation system 200 includes a high temperature steam generator for generating high temperature steam and a steam injector, the steam injector is connected to the high temperature steam generator, and the steam injector can inject the high temperature steam into the evaporation system 300, In order to make the sewage treatment system work in thermal vapor recompression (TVR) mode.
  • the high-temperature steam generation system 200 includes a compressor, which can compress and heat up the steam generated by the evaporation of sewage in the evaporation system 300 to form high-temperature steam, and introduce the high-temperature steam into the evaporation system 300, so that the sewage treatment system is a mechanical vapor recompression (MVR). )Operating mode.
  • MVR mechanical vapor recompression
  • the compressor and the steam ejector can be used alternatively. In other embodiments, either the steam ejector and the compressor may also be omitted.
  • the high-temperature steam generator supplies the evaporation system 300 with high-temperature steam in the initial stage of the operation of the evaporation system 300 .
  • the high-temperature steam generator can also supply the high-temperature steam to the evaporation system 300 to assist the compressor.
  • the high-temperature steam injected from the steam ejector can enter the falling film heater in the falling film evaporation module of the rear stage, and at the same time enter the forced heating in the forced evaporation module of the rear stage. inside the device.
  • the steam generated by the falling film separation chamber in the falling film evaporation module of the previous stage and the steam generated by the forced separation chamber in the forced evaporation module of the previous stage both enter the steam ejector to be recirculated and heated to form high-temperature steam.
  • the evaporation system 300 has five evaporation modules 310.
  • the high-temperature steam generated by the compressor enters the falling film heater in the falling film evaporation module of the rear stage, and enters the forced heater in the forced evaporation module of the rear stage at the same time.
  • the steam generated by the falling film separation chamber in the falling film evaporation module of the previous level and the steam generated by the forced separation chamber in the forced evaporation module of the previous level all return to the compressor to increase temperature and pressure, so as to realize the cycle of energy. Use to reduce the energy consumption of the compressor.
  • the evaporation system 300 has five evaporation modules 310.
  • the evaporation modules 310 of No. 4 and No. 5 are all forced evaporation modules: as shown in the figure
  • the high-temperature steam generated by the compressor enters the No. 3 falling film heater, and the steam generated by the No. 1 falling film separation chamber returns to the compressor.
  • the high-temperature steam generated by the compressor enters the No. 5 forced heater, and the steam generated by the No. 4 forced separation chamber returns to the compressor.
  • the high-temperature steam generator can supply high-temperature steam to any evaporation module 310 that is not isolated.
  • the sewage treatment system further includes a pressure control system 400
  • the pressure control system 400 includes a vacuum pump and a plurality of condensers, and the plurality of condensers are connected in series in the communication passage between the vacuum pump and the evaporation system 300
  • the high-temperature steam introduced into the condenser can exchange heat with the cooling water introduced into the condenser to cause condensation, and multiple condensers can realize the step-by-step cooling and condensation of the high-temperature steam.
  • a vacuum pump can draw steam from the evaporation system 300 to control the pressure within the evaporation system 300 .
  • the plurality of evaporation modules 310 in the evaporation system 300 are respectively communicated with the vacuum pump, so that the vacuum pump can control the pressure of any evaporation module 310 .
  • the vacuum pump is connected with the falling film heater in the falling film evaporation module and also with the forced heater in the forced evaporation module, so as to control the falling film heater and the pressure in the forced heater.
  • the plurality of condensers have the effect of condensing and cooling the steam having a relatively high temperature which is passed into the vacuum pump, and the condensed water produced by the condensation of the steam also flows into the distilled water tank for collection.
  • the vacuum pump is connected with a separation tank, and there is sealing water in the separation tank. After the gas entering the vacuum pump passes through the sealing water, the moisture in the gas is sealed and separated by the sealing water, and the non-condensable gas can be discharged.

Abstract

L'invention concerne un système de traitement des eaux usées qui comprend un système de préchauffage, un système de génération de vapeur à haute température et un système d'évaporation relié à la fois au système de préchauffage et au système de génération de vapeur à haute température. Le système de préchauffage est utilisé pour préchauffer les eaux usées. Le système de génération de vapeur à haute température est utilisé pour générer de la vapeur à haute température. Le système d'évaporation comprend une pluralité de modules d'évaporation. L'un quelconque de la pluralité de modules d'évaporation peut être séparé, et sous le chauffage de la vapeur à haute température, les modules d'évaporation restants interagissant pour évaporer et concentrer les eaux usées préchauffées, étape par étape, de manière à obtenir un liquide concentré et de l'eau condensée.
PCT/CN2021/070768 2020-08-20 2021-01-08 Système de traitement des eaux usées WO2022037001A1 (fr)

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